Sat, 22 Nov 2008 00:16:09 -0800
6554406: Change switch UseVMInterruptibleIO default to false (sol)
Summary: The default value of UseVMInterruptibleIO is changed to false for JDK 7, but the default isn't changed for JDK 6 and earlier.
Reviewed-by: never, acorn, dholmes, kamg, alanb
1 /*
2 * Copyright 1997-2008 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(const char* suffix);
233 inline void reset_path(const char* base);
235 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
236 // property. Must be called after all command-line arguments have been
237 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
238 // combined_path().
239 void expand_endorsed();
241 inline const char* get_base() const { return _items[_scp_base]; }
242 inline const char* get_prefix() const { return _items[_scp_prefix]; }
243 inline const char* get_suffix() const { return _items[_scp_suffix]; }
244 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
246 // Combine all the components into a single c-heap-allocated string; caller
247 // must free the string if/when no longer needed.
248 char* combined_path();
250 private:
251 // Utility routines.
252 static char* add_to_path(const char* path, const char* str, bool prepend);
253 static char* add_jars_to_path(char* path, const char* directory);
255 inline void reset_item_at(int index);
257 // Array indices for the items that make up the sysclasspath. All except the
258 // base are allocated in the C heap and freed by this class.
259 enum {
260 _scp_prefix, // from -Xbootclasspath/p:...
261 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
262 _scp_base, // the default sysclasspath
263 _scp_suffix, // from -Xbootclasspath/a:...
264 _scp_nitems // the number of items, must be last.
265 };
267 const char* _items[_scp_nitems];
268 DEBUG_ONLY(bool _expansion_done;)
269 };
271 SysClassPath::SysClassPath(const char* base) {
272 memset(_items, 0, sizeof(_items));
273 _items[_scp_base] = base;
274 DEBUG_ONLY(_expansion_done = false;)
275 }
277 SysClassPath::~SysClassPath() {
278 // Free everything except the base.
279 for (int i = 0; i < _scp_nitems; ++i) {
280 if (i != _scp_base) reset_item_at(i);
281 }
282 DEBUG_ONLY(_expansion_done = false;)
283 }
285 inline void SysClassPath::set_base(const char* base) {
286 _items[_scp_base] = base;
287 }
289 inline void SysClassPath::add_prefix(const char* prefix) {
290 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
291 }
293 inline void SysClassPath::add_suffix(const char* suffix) {
294 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
295 }
297 inline void SysClassPath::reset_item_at(int index) {
298 assert(index < _scp_nitems && index != _scp_base, "just checking");
299 if (_items[index] != NULL) {
300 FREE_C_HEAP_ARRAY(char, _items[index]);
301 _items[index] = NULL;
302 }
303 }
305 inline void SysClassPath::reset_path(const char* base) {
306 // Clear the prefix and suffix.
307 reset_item_at(_scp_prefix);
308 reset_item_at(_scp_suffix);
309 set_base(base);
310 }
312 //------------------------------------------------------------------------------
314 void SysClassPath::expand_endorsed() {
315 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
317 const char* path = Arguments::get_property("java.endorsed.dirs");
318 if (path == NULL) {
319 path = Arguments::get_endorsed_dir();
320 assert(path != NULL, "no default for java.endorsed.dirs");
321 }
323 char* expanded_path = NULL;
324 const char separator = *os::path_separator();
325 const char* const end = path + strlen(path);
326 while (path < end) {
327 const char* tmp_end = strchr(path, separator);
328 if (tmp_end == NULL) {
329 expanded_path = add_jars_to_path(expanded_path, path);
330 path = end;
331 } else {
332 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
333 memcpy(dirpath, path, tmp_end - path);
334 dirpath[tmp_end - path] = '\0';
335 expanded_path = add_jars_to_path(expanded_path, dirpath);
336 FREE_C_HEAP_ARRAY(char, dirpath);
337 path = tmp_end + 1;
338 }
339 }
340 _items[_scp_endorsed] = expanded_path;
341 DEBUG_ONLY(_expansion_done = true;)
342 }
344 // Combine the bootclasspath elements, some of which may be null, into a single
345 // c-heap-allocated string.
346 char* SysClassPath::combined_path() {
347 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
348 assert(_expansion_done, "must call expand_endorsed() first.");
350 size_t lengths[_scp_nitems];
351 size_t total_len = 0;
353 const char separator = *os::path_separator();
355 // Get the lengths.
356 int i;
357 for (i = 0; i < _scp_nitems; ++i) {
358 if (_items[i] != NULL) {
359 lengths[i] = strlen(_items[i]);
360 // Include space for the separator char (or a NULL for the last item).
361 total_len += lengths[i] + 1;
362 }
363 }
364 assert(total_len > 0, "empty sysclasspath not allowed");
366 // Copy the _items to a single string.
367 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
368 char* cp_tmp = cp;
369 for (i = 0; i < _scp_nitems; ++i) {
370 if (_items[i] != NULL) {
371 memcpy(cp_tmp, _items[i], lengths[i]);
372 cp_tmp += lengths[i];
373 *cp_tmp++ = separator;
374 }
375 }
376 *--cp_tmp = '\0'; // Replace the extra separator.
377 return cp;
378 }
380 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
381 char*
382 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
383 char *cp;
385 assert(str != NULL, "just checking");
386 if (path == NULL) {
387 size_t len = strlen(str) + 1;
388 cp = NEW_C_HEAP_ARRAY(char, len);
389 memcpy(cp, str, len); // copy the trailing null
390 } else {
391 const char separator = *os::path_separator();
392 size_t old_len = strlen(path);
393 size_t str_len = strlen(str);
394 size_t len = old_len + str_len + 2;
396 if (prepend) {
397 cp = NEW_C_HEAP_ARRAY(char, len);
398 char* cp_tmp = cp;
399 memcpy(cp_tmp, str, str_len);
400 cp_tmp += str_len;
401 *cp_tmp = separator;
402 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
403 FREE_C_HEAP_ARRAY(char, path);
404 } else {
405 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
406 char* cp_tmp = cp + old_len;
407 *cp_tmp = separator;
408 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
409 }
410 }
411 return cp;
412 }
414 // Scan the directory and append any jar or zip files found to path.
415 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
416 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
417 DIR* dir = os::opendir(directory);
418 if (dir == NULL) return path;
420 char dir_sep[2] = { '\0', '\0' };
421 size_t directory_len = strlen(directory);
422 const char fileSep = *os::file_separator();
423 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
425 /* Scan the directory for jars/zips, appending them to path. */
426 struct dirent *entry;
427 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
428 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
429 const char* name = entry->d_name;
430 const char* ext = name + strlen(name) - 4;
431 bool isJarOrZip = ext > name &&
432 (os::file_name_strcmp(ext, ".jar") == 0 ||
433 os::file_name_strcmp(ext, ".zip") == 0);
434 if (isJarOrZip) {
435 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
436 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
437 path = add_to_path(path, jarpath, false);
438 FREE_C_HEAP_ARRAY(char, jarpath);
439 }
440 }
441 FREE_C_HEAP_ARRAY(char, dbuf);
442 os::closedir(dir);
443 return path;
444 }
446 // Parses a memory size specification string.
447 static bool atomll(const char *s, jlong* result) {
448 jlong n = 0;
449 int args_read = sscanf(s, os::jlong_format_specifier(), &n);
450 if (args_read != 1) {
451 return false;
452 }
453 while (*s != '\0' && isdigit(*s)) {
454 s++;
455 }
456 // 4705540: illegal if more characters are found after the first non-digit
457 if (strlen(s) > 1) {
458 return false;
459 }
460 switch (*s) {
461 case 'T': case 't':
462 *result = n * G * K;
463 return true;
464 case 'G': case 'g':
465 *result = n * G;
466 return true;
467 case 'M': case 'm':
468 *result = n * M;
469 return true;
470 case 'K': case 'k':
471 *result = n * K;
472 return true;
473 case '\0':
474 *result = n;
475 return true;
476 default:
477 return false;
478 }
479 }
481 Arguments::ArgsRange Arguments::check_memory_size(jlong size, jlong min_size) {
482 if (size < min_size) return arg_too_small;
483 // Check that size will fit in a size_t (only relevant on 32-bit)
484 if ((julong) size > max_uintx) return arg_too_big;
485 return arg_in_range;
486 }
488 // Describe an argument out of range error
489 void Arguments::describe_range_error(ArgsRange errcode) {
490 switch(errcode) {
491 case arg_too_big:
492 jio_fprintf(defaultStream::error_stream(),
493 "The specified size exceeds the maximum "
494 "representable size.\n");
495 break;
496 case arg_too_small:
497 case arg_unreadable:
498 case arg_in_range:
499 // do nothing for now
500 break;
501 default:
502 ShouldNotReachHere();
503 }
504 }
506 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
507 return CommandLineFlags::boolAtPut(name, &value, origin);
508 }
511 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
512 double v;
513 if (sscanf(value, "%lf", &v) != 1) {
514 return false;
515 }
517 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
518 return true;
519 }
520 return false;
521 }
524 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
525 jlong v;
526 intx intx_v;
527 bool is_neg = false;
528 // Check the sign first since atomll() parses only unsigned values.
529 if (*value == '-') {
530 if (!CommandLineFlags::intxAt(name, &intx_v)) {
531 return false;
532 }
533 value++;
534 is_neg = true;
535 }
536 if (!atomll(value, &v)) {
537 return false;
538 }
539 intx_v = (intx) v;
540 if (is_neg) {
541 intx_v = -intx_v;
542 }
543 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
544 return true;
545 }
546 uintx uintx_v = (uintx) v;
547 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
548 return true;
549 }
550 return false;
551 }
554 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
555 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
556 // Contract: CommandLineFlags always returns a pointer that needs freeing.
557 FREE_C_HEAP_ARRAY(char, value);
558 return true;
559 }
561 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
562 const char* old_value = "";
563 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
564 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
565 size_t new_len = strlen(new_value);
566 const char* value;
567 char* free_this_too = NULL;
568 if (old_len == 0) {
569 value = new_value;
570 } else if (new_len == 0) {
571 value = old_value;
572 } else {
573 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
574 // each new setting adds another LINE to the switch:
575 sprintf(buf, "%s\n%s", old_value, new_value);
576 value = buf;
577 free_this_too = buf;
578 }
579 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
580 // CommandLineFlags always returns a pointer that needs freeing.
581 FREE_C_HEAP_ARRAY(char, value);
582 if (free_this_too != NULL) {
583 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
584 FREE_C_HEAP_ARRAY(char, free_this_too);
585 }
586 return true;
587 }
590 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
592 // range of acceptable characters spelled out for portability reasons
593 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
594 #define BUFLEN 255
595 char name[BUFLEN+1];
596 char dummy;
598 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
599 return set_bool_flag(name, false, origin);
600 }
601 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
602 return set_bool_flag(name, true, origin);
603 }
605 char punct;
606 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
607 const char* value = strchr(arg, '=') + 1;
608 Flag* flag = Flag::find_flag(name, strlen(name));
609 if (flag != NULL && flag->is_ccstr()) {
610 if (flag->ccstr_accumulates()) {
611 return append_to_string_flag(name, value, origin);
612 } else {
613 if (value[0] == '\0') {
614 value = NULL;
615 }
616 return set_string_flag(name, value, origin);
617 }
618 }
619 }
621 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
622 const char* value = strchr(arg, '=') + 1;
623 // -XX:Foo:=xxx will reset the string flag to the given value.
624 if (value[0] == '\0') {
625 value = NULL;
626 }
627 return set_string_flag(name, value, origin);
628 }
630 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
631 #define SIGNED_NUMBER_RANGE "[-0123456789]"
632 #define NUMBER_RANGE "[0123456789]"
633 char value[BUFLEN + 1];
634 char value2[BUFLEN + 1];
635 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
636 // Looks like a floating-point number -- try again with more lenient format string
637 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
638 return set_fp_numeric_flag(name, value, origin);
639 }
640 }
642 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
643 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
644 return set_numeric_flag(name, value, origin);
645 }
647 return false;
648 }
651 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
652 assert(bldarray != NULL, "illegal argument");
654 if (arg == NULL) {
655 return;
656 }
658 int index = *count;
660 // expand the array and add arg to the last element
661 (*count)++;
662 if (*bldarray == NULL) {
663 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
664 } else {
665 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
666 }
667 (*bldarray)[index] = strdup(arg);
668 }
670 void Arguments::build_jvm_args(const char* arg) {
671 add_string(&_jvm_args_array, &_num_jvm_args, arg);
672 }
674 void Arguments::build_jvm_flags(const char* arg) {
675 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
676 }
678 // utility function to return a string that concatenates all
679 // strings in a given char** array
680 const char* Arguments::build_resource_string(char** args, int count) {
681 if (args == NULL || count == 0) {
682 return NULL;
683 }
684 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
685 for (int i = 1; i < count; i++) {
686 length += strlen(args[i]) + 1; // add 1 for a space
687 }
688 char* s = NEW_RESOURCE_ARRAY(char, length);
689 strcpy(s, args[0]);
690 for (int j = 1; j < count; j++) {
691 strcat(s, " ");
692 strcat(s, args[j]);
693 }
694 return (const char*) s;
695 }
697 void Arguments::print_on(outputStream* st) {
698 st->print_cr("VM Arguments:");
699 if (num_jvm_flags() > 0) {
700 st->print("jvm_flags: "); print_jvm_flags_on(st);
701 }
702 if (num_jvm_args() > 0) {
703 st->print("jvm_args: "); print_jvm_args_on(st);
704 }
705 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
706 st->print_cr("Launcher Type: %s", _sun_java_launcher);
707 }
709 void Arguments::print_jvm_flags_on(outputStream* st) {
710 if (_num_jvm_flags > 0) {
711 for (int i=0; i < _num_jvm_flags; i++) {
712 st->print("%s ", _jvm_flags_array[i]);
713 }
714 st->print_cr("");
715 }
716 }
718 void Arguments::print_jvm_args_on(outputStream* st) {
719 if (_num_jvm_args > 0) {
720 for (int i=0; i < _num_jvm_args; i++) {
721 st->print("%s ", _jvm_args_array[i]);
722 }
723 st->print_cr("");
724 }
725 }
727 bool Arguments::process_argument(const char* arg,
728 jboolean ignore_unrecognized, FlagValueOrigin origin) {
730 JDK_Version since = JDK_Version();
732 if (parse_argument(arg, origin)) {
733 // do nothing
734 } else if (is_newly_obsolete(arg, &since)) {
735 enum { bufsize = 256 };
736 char buffer[bufsize];
737 since.to_string(buffer, bufsize);
738 jio_fprintf(defaultStream::error_stream(),
739 "Warning: The flag %s has been EOL'd as of %s and will"
740 " be ignored\n", arg, buffer);
741 } else {
742 if (!ignore_unrecognized) {
743 jio_fprintf(defaultStream::error_stream(),
744 "Unrecognized VM option '%s'\n", arg);
745 // allow for commandline "commenting out" options like -XX:#+Verbose
746 if (strlen(arg) == 0 || arg[0] != '#') {
747 return false;
748 }
749 }
750 }
751 return true;
752 }
755 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
756 FILE* stream = fopen(file_name, "rb");
757 if (stream == NULL) {
758 if (should_exist) {
759 jio_fprintf(defaultStream::error_stream(),
760 "Could not open settings file %s\n", file_name);
761 return false;
762 } else {
763 return true;
764 }
765 }
767 char token[1024];
768 int pos = 0;
770 bool in_white_space = true;
771 bool in_comment = false;
772 bool in_quote = false;
773 char quote_c = 0;
774 bool result = true;
776 int c = getc(stream);
777 while(c != EOF) {
778 if (in_white_space) {
779 if (in_comment) {
780 if (c == '\n') in_comment = false;
781 } else {
782 if (c == '#') in_comment = true;
783 else if (!isspace(c)) {
784 in_white_space = false;
785 token[pos++] = c;
786 }
787 }
788 } else {
789 if (c == '\n' || (!in_quote && isspace(c))) {
790 // token ends at newline, or at unquoted whitespace
791 // this allows a way to include spaces in string-valued options
792 token[pos] = '\0';
793 logOption(token);
794 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
795 build_jvm_flags(token);
796 pos = 0;
797 in_white_space = true;
798 in_quote = false;
799 } else if (!in_quote && (c == '\'' || c == '"')) {
800 in_quote = true;
801 quote_c = c;
802 } else if (in_quote && (c == quote_c)) {
803 in_quote = false;
804 } else {
805 token[pos++] = c;
806 }
807 }
808 c = getc(stream);
809 }
810 if (pos > 0) {
811 token[pos] = '\0';
812 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
813 build_jvm_flags(token);
814 }
815 fclose(stream);
816 return result;
817 }
819 //=============================================================================================================
820 // Parsing of properties (-D)
822 const char* Arguments::get_property(const char* key) {
823 return PropertyList_get_value(system_properties(), key);
824 }
826 bool Arguments::add_property(const char* prop) {
827 const char* eq = strchr(prop, '=');
828 char* key;
829 // ns must be static--its address may be stored in a SystemProperty object.
830 const static char ns[1] = {0};
831 char* value = (char *)ns;
833 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
834 key = AllocateHeap(key_len + 1, "add_property");
835 strncpy(key, prop, key_len);
836 key[key_len] = '\0';
838 if (eq != NULL) {
839 size_t value_len = strlen(prop) - key_len - 1;
840 value = AllocateHeap(value_len + 1, "add_property");
841 strncpy(value, &prop[key_len + 1], value_len + 1);
842 }
844 if (strcmp(key, "java.compiler") == 0) {
845 process_java_compiler_argument(value);
846 FreeHeap(key);
847 if (eq != NULL) {
848 FreeHeap(value);
849 }
850 return true;
851 }
852 else if (strcmp(key, "sun.java.command") == 0) {
854 _java_command = value;
856 // don't add this property to the properties exposed to the java application
857 FreeHeap(key);
858 return true;
859 }
860 else if (strcmp(key, "sun.java.launcher.pid") == 0) {
861 // launcher.pid property is private and is processed
862 // in process_sun_java_launcher_properties();
863 // the sun.java.launcher property is passed on to the java application
864 FreeHeap(key);
865 if (eq != NULL) {
866 FreeHeap(value);
867 }
868 return true;
869 }
870 else if (strcmp(key, "java.vendor.url.bug") == 0) {
871 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
872 // its value without going through the property list or making a Java call.
873 _java_vendor_url_bug = value;
874 }
876 // Create new property and add at the end of the list
877 PropertyList_unique_add(&_system_properties, key, value);
878 return true;
879 }
881 //===========================================================================================================
882 // Setting int/mixed/comp mode flags
884 void Arguments::set_mode_flags(Mode mode) {
885 // Set up default values for all flags.
886 // If you add a flag to any of the branches below,
887 // add a default value for it here.
888 set_java_compiler(false);
889 _mode = mode;
891 // Ensure Agent_OnLoad has the correct initial values.
892 // This may not be the final mode; mode may change later in onload phase.
893 PropertyList_unique_add(&_system_properties, "java.vm.info",
894 (char*)Abstract_VM_Version::vm_info_string());
896 UseInterpreter = true;
897 UseCompiler = true;
898 UseLoopCounter = true;
900 // Default values may be platform/compiler dependent -
901 // use the saved values
902 ClipInlining = Arguments::_ClipInlining;
903 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
904 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
905 BackgroundCompilation = Arguments::_BackgroundCompilation;
906 Tier2CompileThreshold = Arguments::_Tier2CompileThreshold;
908 // Change from defaults based on mode
909 switch (mode) {
910 default:
911 ShouldNotReachHere();
912 break;
913 case _int:
914 UseCompiler = false;
915 UseLoopCounter = false;
916 AlwaysCompileLoopMethods = false;
917 UseOnStackReplacement = false;
918 break;
919 case _mixed:
920 // same as default
921 break;
922 case _comp:
923 UseInterpreter = false;
924 BackgroundCompilation = false;
925 ClipInlining = false;
926 break;
927 }
928 }
931 // Conflict: required to use shared spaces (-Xshare:on), but
932 // incompatible command line options were chosen.
934 static void no_shared_spaces() {
935 if (RequireSharedSpaces) {
936 jio_fprintf(defaultStream::error_stream(),
937 "Class data sharing is inconsistent with other specified options.\n");
938 vm_exit_during_initialization("Unable to use shared archive.", NULL);
939 } else {
940 FLAG_SET_DEFAULT(UseSharedSpaces, false);
941 }
942 }
945 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
946 // if it's not explictly set or unset. If the user has chosen
947 // UseParNewGC and not explicitly set ParallelGCThreads we
948 // set it, unless this is a single cpu machine.
949 void Arguments::set_parnew_gc_flags() {
950 assert(!UseSerialGC && !UseParallelGC && !UseG1GC,
951 "control point invariant");
952 assert(UseParNewGC, "Error");
954 // Turn off AdaptiveSizePolicy by default for parnew until it is
955 // complete.
956 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
957 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
958 }
960 if (ParallelGCThreads == 0) {
961 FLAG_SET_DEFAULT(ParallelGCThreads,
962 Abstract_VM_Version::parallel_worker_threads());
963 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
964 FLAG_SET_DEFAULT(UseParNewGC, false);
965 }
966 }
967 if (!UseParNewGC) {
968 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
969 } else {
970 no_shared_spaces();
972 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 correspondinly,
973 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
974 // we set them to 1024 and 1024.
975 // See CR 6362902.
976 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
977 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
978 }
979 if (FLAG_IS_DEFAULT(OldPLABSize)) {
980 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
981 }
983 // AlwaysTenure flag should make ParNew to promote all at first collection.
984 // See CR 6362902.
985 if (AlwaysTenure) {
986 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
987 }
988 }
989 }
991 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
992 // sparc/solaris for certain applications, but would gain from
993 // further optimization and tuning efforts, and would almost
994 // certainly gain from analysis of platform and environment.
995 void Arguments::set_cms_and_parnew_gc_flags() {
996 assert(!UseSerialGC && !UseParallelGC, "Error");
997 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
999 // If we are using CMS, we prefer to UseParNewGC,
1000 // unless explicitly forbidden.
1001 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1002 FLAG_SET_ERGO(bool, UseParNewGC, true);
1003 }
1005 // Turn off AdaptiveSizePolicy by default for cms until it is
1006 // complete.
1007 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1008 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1009 }
1011 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1012 // as needed.
1013 if (UseParNewGC) {
1014 set_parnew_gc_flags();
1015 }
1017 // Now make adjustments for CMS
1018 size_t young_gen_per_worker;
1019 intx new_ratio;
1020 size_t min_new_default;
1021 intx tenuring_default;
1022 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0
1023 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
1024 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1025 }
1026 young_gen_per_worker = 4*M;
1027 new_ratio = (intx)15;
1028 min_new_default = 4*M;
1029 tenuring_default = (intx)0;
1030 } else { // new defaults: "new" as of 6.0
1031 young_gen_per_worker = CMSYoungGenPerWorker;
1032 new_ratio = (intx)7;
1033 min_new_default = 16*M;
1034 tenuring_default = (intx)4;
1035 }
1037 // Preferred young gen size for "short" pauses
1038 const uintx parallel_gc_threads =
1039 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1040 const size_t preferred_max_new_size_unaligned =
1041 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1042 const size_t preferred_max_new_size =
1043 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1045 // Unless explicitly requested otherwise, size young gen
1046 // for "short" pauses ~ 4M*ParallelGCThreads
1047 if (FLAG_IS_DEFAULT(MaxNewSize)) { // MaxNewSize not set at command-line
1048 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1049 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1050 } else {
1051 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1052 }
1053 if(PrintGCDetails && Verbose) {
1054 // Too early to use gclog_or_tty
1055 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1056 }
1057 }
1058 // Unless explicitly requested otherwise, prefer a large
1059 // Old to Young gen size so as to shift the collection load
1060 // to the old generation concurrent collector
1061 if (FLAG_IS_DEFAULT(NewRatio)) {
1062 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1064 size_t min_new = align_size_up(ScaleForWordSize(min_new_default), os::vm_page_size());
1065 size_t prev_initial_size = initial_heap_size();
1066 if (prev_initial_size != 0 && prev_initial_size < min_new+OldSize) {
1067 set_initial_heap_size(min_new+OldSize);
1068 // Currently minimum size and the initial heap sizes are the same.
1069 set_min_heap_size(initial_heap_size());
1070 if (PrintGCDetails && Verbose) {
1071 warning("Initial heap size increased to " SIZE_FORMAT " M from "
1072 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1073 initial_heap_size()/M, prev_initial_size/M);
1074 }
1075 }
1076 // MaxHeapSize is aligned down in collectorPolicy
1077 size_t max_heap = align_size_down(MaxHeapSize,
1078 CardTableRS::ct_max_alignment_constraint());
1080 if(PrintGCDetails && Verbose) {
1081 // Too early to use gclog_or_tty
1082 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1083 " initial_heap_size: " SIZE_FORMAT
1084 " max_heap: " SIZE_FORMAT,
1085 min_heap_size(), initial_heap_size(), max_heap);
1086 }
1087 if (max_heap > min_new) {
1088 // Unless explicitly requested otherwise, make young gen
1089 // at least min_new, and at most preferred_max_new_size.
1090 if (FLAG_IS_DEFAULT(NewSize)) {
1091 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1092 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1093 if(PrintGCDetails && Verbose) {
1094 // Too early to use gclog_or_tty
1095 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1096 }
1097 }
1098 // Unless explicitly requested otherwise, size old gen
1099 // so that it's at least 3X of NewSize to begin with;
1100 // later NewRatio will decide how it grows; see above.
1101 if (FLAG_IS_DEFAULT(OldSize)) {
1102 if (max_heap > NewSize) {
1103 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));
1104 if(PrintGCDetails && Verbose) {
1105 // Too early to use gclog_or_tty
1106 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1107 }
1108 }
1109 }
1110 }
1111 }
1112 // Unless explicitly requested otherwise, definitely
1113 // promote all objects surviving "tenuring_default" scavenges.
1114 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1115 FLAG_IS_DEFAULT(SurvivorRatio)) {
1116 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1117 }
1118 // If we decided above (or user explicitly requested)
1119 // `promote all' (via MaxTenuringThreshold := 0),
1120 // prefer minuscule survivor spaces so as not to waste
1121 // space for (non-existent) survivors
1122 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1123 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1124 }
1125 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1126 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1127 // This is done in order to make ParNew+CMS configuration to work
1128 // with YoungPLABSize and OldPLABSize options.
1129 // See CR 6362902.
1130 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1131 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1132 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1133 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1134 // the value (either from the command line or ergonomics) of
1135 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1136 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1137 }
1138 else {
1139 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1140 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1141 // we'll let it to take precedence.
1142 jio_fprintf(defaultStream::error_stream(),
1143 "Both OldPLABSize and CMSParPromoteBlocksToClaim options are specified "
1144 "for the CMS collector. CMSParPromoteBlocksToClaim will take precedence.\n");
1145 }
1146 }
1147 }
1149 inline uintx max_heap_for_compressed_oops() {
1150 LP64_ONLY(return oopDesc::OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1151 NOT_LP64(return DefaultMaxRAM);
1152 }
1154 bool Arguments::should_auto_select_low_pause_collector() {
1155 if (UseAutoGCSelectPolicy &&
1156 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1157 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1158 if (PrintGCDetails) {
1159 // Cannot use gclog_or_tty yet.
1160 tty->print_cr("Automatic selection of the low pause collector"
1161 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1162 }
1163 return true;
1164 }
1165 return false;
1166 }
1168 void Arguments::set_ergonomics_flags() {
1169 // Parallel GC is not compatible with sharing. If one specifies
1170 // that they want sharing explicitly, do not set ergonmics flags.
1171 if (DumpSharedSpaces || ForceSharedSpaces) {
1172 return;
1173 }
1175 if (os::is_server_class_machine() && !force_client_mode ) {
1176 // If no other collector is requested explicitly,
1177 // let the VM select the collector based on
1178 // machine class and automatic selection policy.
1179 if (!UseSerialGC &&
1180 !UseConcMarkSweepGC &&
1181 !UseG1GC &&
1182 !UseParNewGC &&
1183 !DumpSharedSpaces &&
1184 FLAG_IS_DEFAULT(UseParallelGC)) {
1185 if (should_auto_select_low_pause_collector()) {
1186 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1187 } else {
1188 FLAG_SET_ERGO(bool, UseParallelGC, true);
1189 }
1190 no_shared_spaces();
1191 }
1192 }
1194 #ifdef _LP64
1195 // Compressed Headers do not work with CMS, which uses a bit in the klass
1196 // field offset to determine free list chunk markers.
1197 // Check that UseCompressedOops can be set with the max heap size allocated
1198 // by ergonomics.
1199 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1200 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
1201 // Turn off until bug is fixed.
1202 // the following line to return it to default status.
1203 // FLAG_SET_ERGO(bool, UseCompressedOops, true);
1204 } else if (UseCompressedOops && UseG1GC) {
1205 warning(" UseCompressedOops does not currently work with UseG1GC; switching off UseCompressedOops. ");
1206 FLAG_SET_DEFAULT(UseCompressedOops, false);
1207 }
1208 #ifdef _WIN64
1209 if (UseLargePages && UseCompressedOops) {
1210 // Cannot allocate guard pages for implicit checks in indexed addressing
1211 // mode, when large pages are specified on windows.
1212 FLAG_SET_DEFAULT(UseImplicitNullCheckForNarrowOop, false);
1213 }
1214 #endif // _WIN64
1215 } else {
1216 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1217 warning("Max heap size too large for Compressed Oops");
1218 FLAG_SET_DEFAULT(UseCompressedOops, false);
1219 }
1220 }
1221 // Also checks that certain machines are slower with compressed oops
1222 // in vm_version initialization code.
1223 #endif // _LP64
1224 }
1226 void Arguments::set_parallel_gc_flags() {
1227 assert(UseParallelGC || UseParallelOldGC, "Error");
1228 // If parallel old was requested, automatically enable parallel scavenge.
1229 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1230 FLAG_SET_DEFAULT(UseParallelGC, true);
1231 }
1233 // If no heap maximum was requested explicitly, use some reasonable fraction
1234 // of the physical memory, up to a maximum of 1GB.
1235 if (UseParallelGC) {
1236 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1237 Abstract_VM_Version::parallel_worker_threads());
1239 // PS is a server collector, setup the heap sizes accordingly.
1240 set_server_heap_size();
1241 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1242 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1243 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1244 // See CR 6362902 for details.
1245 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1246 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1247 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1248 }
1249 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1250 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1251 }
1252 }
1254 if (UseParallelOldGC) {
1255 // Par compact uses lower default values since they are treated as
1256 // minimums. These are different defaults because of the different
1257 // interpretation and are not ergonomically set.
1258 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1259 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1260 }
1261 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1262 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1263 }
1264 }
1265 }
1266 }
1268 void Arguments::set_g1_gc_flags() {
1269 assert(UseG1GC, "Error");
1270 // G1 is a server collector, setup the heap sizes accordingly.
1271 set_server_heap_size();
1272 #ifdef COMPILER1
1273 FastTLABRefill = false;
1274 #endif
1275 FLAG_SET_DEFAULT(ParallelGCThreads,
1276 Abstract_VM_Version::parallel_worker_threads());
1277 if (ParallelGCThreads == 0) {
1278 FLAG_SET_DEFAULT(ParallelGCThreads,
1279 Abstract_VM_Version::parallel_worker_threads
1280 ());
1281 }
1282 no_shared_spaces();
1283 }
1285 void Arguments::set_server_heap_size() {
1286 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1287 const uint64_t reasonable_fraction =
1288 os::physical_memory() / DefaultMaxRAMFraction;
1289 const uint64_t maximum_size = (uint64_t)
1290 (FLAG_IS_DEFAULT(DefaultMaxRAM) && UseCompressedOops ?
1291 MIN2(max_heap_for_compressed_oops(), DefaultMaxRAM) :
1292 DefaultMaxRAM);
1293 size_t reasonable_max =
1294 (size_t) os::allocatable_physical_memory(reasonable_fraction);
1295 if (reasonable_max > maximum_size) {
1296 reasonable_max = maximum_size;
1297 }
1298 if (PrintGCDetails && Verbose) {
1299 // Cannot use gclog_or_tty yet.
1300 tty->print_cr(" Max heap size for server class platform "
1301 SIZE_FORMAT, reasonable_max);
1302 }
1303 // If the initial_heap_size has not been set with -Xms,
1304 // then set it as fraction of size of physical memory
1305 // respecting the maximum and minimum sizes of the heap.
1306 if (initial_heap_size() == 0) {
1307 const uint64_t reasonable_initial_fraction =
1308 os::physical_memory() / DefaultInitialRAMFraction;
1309 const size_t reasonable_initial =
1310 (size_t) os::allocatable_physical_memory(reasonable_initial_fraction);
1311 const size_t minimum_size = NewSize + OldSize;
1312 set_initial_heap_size(MAX2(MIN2(reasonable_initial, reasonable_max),
1313 minimum_size));
1314 // Currently the minimum size and the initial heap sizes are the same.
1315 set_min_heap_size(initial_heap_size());
1316 if (PrintGCDetails && Verbose) {
1317 // Cannot use gclog_or_tty yet.
1318 tty->print_cr(" Initial heap size for server class platform "
1319 SIZE_FORMAT, initial_heap_size());
1320 }
1321 } else {
1322 // A minimum size was specified on the command line. Be sure
1323 // that the maximum size is consistent.
1324 if (initial_heap_size() > reasonable_max) {
1325 reasonable_max = initial_heap_size();
1326 }
1327 }
1328 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx) reasonable_max);
1329 }
1330 }
1332 // This must be called after ergonomics because we want bytecode rewriting
1333 // if the server compiler is used, or if UseSharedSpaces is disabled.
1334 void Arguments::set_bytecode_flags() {
1335 // Better not attempt to store into a read-only space.
1336 if (UseSharedSpaces) {
1337 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1338 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1339 }
1341 if (!RewriteBytecodes) {
1342 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1343 }
1344 }
1346 // Aggressive optimization flags -XX:+AggressiveOpts
1347 void Arguments::set_aggressive_opts_flags() {
1348 #ifdef COMPILER2
1349 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1350 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1351 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1352 }
1353 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1354 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1355 }
1357 // Feed the cache size setting into the JDK
1358 char buffer[1024];
1359 sprintf(buffer, "java.lang.Integer.IntegerCache.high=%d", AutoBoxCacheMax);
1360 add_property(buffer);
1361 }
1362 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1363 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1364 }
1365 if (AggressiveOpts && FLAG_IS_DEFAULT(SpecialArraysEquals)) {
1366 FLAG_SET_DEFAULT(SpecialArraysEquals, true);
1367 }
1368 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1369 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1370 }
1371 #endif
1373 if (AggressiveOpts) {
1374 // Sample flag setting code
1375 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1376 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1377 // }
1378 }
1379 }
1381 //===========================================================================================================
1382 // Parsing of java.compiler property
1384 void Arguments::process_java_compiler_argument(char* arg) {
1385 // For backwards compatibility, Djava.compiler=NONE or ""
1386 // causes us to switch to -Xint mode UNLESS -Xdebug
1387 // is also specified.
1388 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1389 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1390 }
1391 }
1393 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1394 _sun_java_launcher = strdup(launcher);
1395 }
1397 bool Arguments::created_by_java_launcher() {
1398 assert(_sun_java_launcher != NULL, "property must have value");
1399 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1400 }
1402 //===========================================================================================================
1403 // Parsing of main arguments
1405 bool Arguments::verify_percentage(uintx value, const char* name) {
1406 if (value <= 100) {
1407 return true;
1408 }
1409 jio_fprintf(defaultStream::error_stream(),
1410 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1411 name, value);
1412 return false;
1413 }
1415 static void set_serial_gc_flags() {
1416 FLAG_SET_DEFAULT(UseSerialGC, true);
1417 FLAG_SET_DEFAULT(UseParNewGC, false);
1418 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1419 FLAG_SET_DEFAULT(UseParallelGC, false);
1420 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1421 FLAG_SET_DEFAULT(UseG1GC, false);
1422 }
1424 static bool verify_serial_gc_flags() {
1425 return (UseSerialGC &&
1426 !(UseParNewGC || UseConcMarkSweepGC || UseG1GC ||
1427 UseParallelGC || UseParallelOldGC));
1428 }
1430 // Check consistency of GC selection
1431 bool Arguments::check_gc_consistency() {
1432 bool status = true;
1433 // Ensure that the user has not selected conflicting sets
1434 // of collectors. [Note: this check is merely a user convenience;
1435 // collectors over-ride each other so that only a non-conflicting
1436 // set is selected; however what the user gets is not what they
1437 // may have expected from the combination they asked for. It's
1438 // better to reduce user confusion by not allowing them to
1439 // select conflicting combinations.
1440 uint i = 0;
1441 if (UseSerialGC) i++;
1442 if (UseConcMarkSweepGC || UseParNewGC) i++;
1443 if (UseParallelGC || UseParallelOldGC) i++;
1444 if (i > 1) {
1445 jio_fprintf(defaultStream::error_stream(),
1446 "Conflicting collector combinations in option list; "
1447 "please refer to the release notes for the combinations "
1448 "allowed\n");
1449 status = false;
1450 }
1452 return status;
1453 }
1455 // Check the consistency of vm_init_args
1456 bool Arguments::check_vm_args_consistency() {
1457 // Method for adding checks for flag consistency.
1458 // The intent is to warn the user of all possible conflicts,
1459 // before returning an error.
1460 // Note: Needs platform-dependent factoring.
1461 bool status = true;
1463 #if ( (defined(COMPILER2) && defined(SPARC)))
1464 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1465 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1466 // x86. Normally, VM_Version_init must be called from init_globals in
1467 // init.cpp, which is called by the initial java thread *after* arguments
1468 // have been parsed. VM_Version_init gets called twice on sparc.
1469 extern void VM_Version_init();
1470 VM_Version_init();
1471 if (!VM_Version::has_v9()) {
1472 jio_fprintf(defaultStream::error_stream(),
1473 "V8 Machine detected, Server requires V9\n");
1474 status = false;
1475 }
1476 #endif /* COMPILER2 && SPARC */
1478 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1479 // builds so the cost of stack banging can be measured.
1480 #if (defined(PRODUCT) && defined(SOLARIS))
1481 if (!UseBoundThreads && !UseStackBanging) {
1482 jio_fprintf(defaultStream::error_stream(),
1483 "-UseStackBanging conflicts with -UseBoundThreads\n");
1485 status = false;
1486 }
1487 #endif
1489 if (TLABRefillWasteFraction == 0) {
1490 jio_fprintf(defaultStream::error_stream(),
1491 "TLABRefillWasteFraction should be a denominator, "
1492 "not " SIZE_FORMAT "\n",
1493 TLABRefillWasteFraction);
1494 status = false;
1495 }
1497 status = status && verify_percentage(MaxLiveObjectEvacuationRatio,
1498 "MaxLiveObjectEvacuationRatio");
1499 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1500 "AdaptiveSizePolicyWeight");
1501 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1502 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1503 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1504 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1506 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1507 jio_fprintf(defaultStream::error_stream(),
1508 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1509 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1510 MinHeapFreeRatio, MaxHeapFreeRatio);
1511 status = false;
1512 }
1513 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1514 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1516 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1517 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1518 }
1520 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1521 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1522 if (GCTimeLimit == 100) {
1523 // Turn off gc-overhead-limit-exceeded checks
1524 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1525 }
1527 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1529 // Check user specified sharing option conflict with Parallel GC
1530 bool cannot_share = (UseConcMarkSweepGC || UseG1GC || UseParNewGC ||
1531 UseParallelGC || UseParallelOldGC ||
1532 SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages));
1534 if (cannot_share) {
1535 // Either force sharing on by forcing the other options off, or
1536 // force sharing off.
1537 if (DumpSharedSpaces || ForceSharedSpaces) {
1538 set_serial_gc_flags();
1539 FLAG_SET_DEFAULT(SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages), false);
1540 } else {
1541 no_shared_spaces();
1542 }
1543 }
1545 status = status && check_gc_consistency();
1547 if (_has_alloc_profile) {
1548 if (UseParallelGC || UseParallelOldGC) {
1549 jio_fprintf(defaultStream::error_stream(),
1550 "error: invalid argument combination.\n"
1551 "Allocation profiling (-Xaprof) cannot be used together with "
1552 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1553 status = false;
1554 }
1555 if (UseConcMarkSweepGC) {
1556 jio_fprintf(defaultStream::error_stream(),
1557 "error: invalid argument combination.\n"
1558 "Allocation profiling (-Xaprof) cannot be used together with "
1559 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1560 status = false;
1561 }
1562 }
1564 if (CMSIncrementalMode) {
1565 if (!UseConcMarkSweepGC) {
1566 jio_fprintf(defaultStream::error_stream(),
1567 "error: invalid argument combination.\n"
1568 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1569 "selected in order\nto use CMSIncrementalMode.\n");
1570 status = false;
1571 } else {
1572 status = status && verify_percentage(CMSIncrementalDutyCycle,
1573 "CMSIncrementalDutyCycle");
1574 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1575 "CMSIncrementalDutyCycleMin");
1576 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1577 "CMSIncrementalSafetyFactor");
1578 status = status && verify_percentage(CMSIncrementalOffset,
1579 "CMSIncrementalOffset");
1580 status = status && verify_percentage(CMSExpAvgFactor,
1581 "CMSExpAvgFactor");
1582 // If it was not set on the command line, set
1583 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1584 if (CMSInitiatingOccupancyFraction < 0) {
1585 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1586 }
1587 }
1588 }
1590 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1591 // insists that we hold the requisite locks so that the iteration is
1592 // MT-safe. For the verification at start-up and shut-down, we don't
1593 // yet have a good way of acquiring and releasing these locks,
1594 // which are not visible at the CollectedHeap level. We want to
1595 // be able to acquire these locks and then do the iteration rather
1596 // than just disable the lock verification. This will be fixed under
1597 // bug 4788986.
1598 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1599 if (VerifyGCStartAt == 0) {
1600 warning("Heap verification at start-up disabled "
1601 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1602 VerifyGCStartAt = 1; // Disable verification at start-up
1603 }
1604 if (VerifyBeforeExit) {
1605 warning("Heap verification at shutdown disabled "
1606 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1607 VerifyBeforeExit = false; // Disable verification at shutdown
1608 }
1609 }
1611 // Note: only executed in non-PRODUCT mode
1612 if (!UseAsyncConcMarkSweepGC &&
1613 (ExplicitGCInvokesConcurrent ||
1614 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1615 jio_fprintf(defaultStream::error_stream(),
1616 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1617 " with -UseAsyncConcMarkSweepGC");
1618 status = false;
1619 }
1621 return status;
1622 }
1624 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1625 const char* option_type) {
1626 if (ignore) return false;
1628 const char* spacer = " ";
1629 if (option_type == NULL) {
1630 option_type = ++spacer; // Set both to the empty string.
1631 }
1633 if (os::obsolete_option(option)) {
1634 jio_fprintf(defaultStream::error_stream(),
1635 "Obsolete %s%soption: %s\n", option_type, spacer,
1636 option->optionString);
1637 return false;
1638 } else {
1639 jio_fprintf(defaultStream::error_stream(),
1640 "Unrecognized %s%soption: %s\n", option_type, spacer,
1641 option->optionString);
1642 return true;
1643 }
1644 }
1646 static const char* user_assertion_options[] = {
1647 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1648 };
1650 static const char* system_assertion_options[] = {
1651 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1652 };
1654 // Return true if any of the strings in null-terminated array 'names' matches.
1655 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1656 // the option must match exactly.
1657 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1658 bool tail_allowed) {
1659 for (/* empty */; *names != NULL; ++names) {
1660 if (match_option(option, *names, tail)) {
1661 if (**tail == '\0' || tail_allowed && **tail == ':') {
1662 return true;
1663 }
1664 }
1665 }
1666 return false;
1667 }
1669 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1670 jlong* long_arg,
1671 jlong min_size) {
1672 if (!atomll(s, long_arg)) return arg_unreadable;
1673 return check_memory_size(*long_arg, min_size);
1674 }
1676 // Parse JavaVMInitArgs structure
1678 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
1679 // For components of the system classpath.
1680 SysClassPath scp(Arguments::get_sysclasspath());
1681 bool scp_assembly_required = false;
1683 // Save default settings for some mode flags
1684 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
1685 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
1686 Arguments::_ClipInlining = ClipInlining;
1687 Arguments::_BackgroundCompilation = BackgroundCompilation;
1688 Arguments::_Tier2CompileThreshold = Tier2CompileThreshold;
1690 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
1691 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
1692 if (result != JNI_OK) {
1693 return result;
1694 }
1696 // Parse JavaVMInitArgs structure passed in
1697 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
1698 if (result != JNI_OK) {
1699 return result;
1700 }
1702 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
1703 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
1704 if (result != JNI_OK) {
1705 return result;
1706 }
1708 // Do final processing now that all arguments have been parsed
1709 result = finalize_vm_init_args(&scp, scp_assembly_required);
1710 if (result != JNI_OK) {
1711 return result;
1712 }
1714 return JNI_OK;
1715 }
1718 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
1719 SysClassPath* scp_p,
1720 bool* scp_assembly_required_p,
1721 FlagValueOrigin origin) {
1722 // Remaining part of option string
1723 const char* tail;
1725 // iterate over arguments
1726 for (int index = 0; index < args->nOptions; index++) {
1727 bool is_absolute_path = false; // for -agentpath vs -agentlib
1729 const JavaVMOption* option = args->options + index;
1731 if (!match_option(option, "-Djava.class.path", &tail) &&
1732 !match_option(option, "-Dsun.java.command", &tail) &&
1733 !match_option(option, "-Dsun.java.launcher", &tail)) {
1735 // add all jvm options to the jvm_args string. This string
1736 // is used later to set the java.vm.args PerfData string constant.
1737 // the -Djava.class.path and the -Dsun.java.command options are
1738 // omitted from jvm_args string as each have their own PerfData
1739 // string constant object.
1740 build_jvm_args(option->optionString);
1741 }
1743 // -verbose:[class/gc/jni]
1744 if (match_option(option, "-verbose", &tail)) {
1745 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
1746 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
1747 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1748 } else if (!strcmp(tail, ":gc")) {
1749 FLAG_SET_CMDLINE(bool, PrintGC, true);
1750 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
1751 } else if (!strcmp(tail, ":jni")) {
1752 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
1753 }
1754 // -da / -ea / -disableassertions / -enableassertions
1755 // These accept an optional class/package name separated by a colon, e.g.,
1756 // -da:java.lang.Thread.
1757 } else if (match_option(option, user_assertion_options, &tail, true)) {
1758 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1759 if (*tail == '\0') {
1760 JavaAssertions::setUserClassDefault(enable);
1761 } else {
1762 assert(*tail == ':', "bogus match by match_option()");
1763 JavaAssertions::addOption(tail + 1, enable);
1764 }
1765 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
1766 } else if (match_option(option, system_assertion_options, &tail, false)) {
1767 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
1768 JavaAssertions::setSystemClassDefault(enable);
1769 // -bootclasspath:
1770 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
1771 scp_p->reset_path(tail);
1772 *scp_assembly_required_p = true;
1773 // -bootclasspath/a:
1774 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
1775 scp_p->add_suffix(tail);
1776 *scp_assembly_required_p = true;
1777 // -bootclasspath/p:
1778 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
1779 scp_p->add_prefix(tail);
1780 *scp_assembly_required_p = true;
1781 // -Xrun
1782 } else if (match_option(option, "-Xrun", &tail)) {
1783 if(tail != NULL) {
1784 const char* pos = strchr(tail, ':');
1785 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
1786 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
1787 name[len] = '\0';
1789 char *options = NULL;
1790 if(pos != NULL) {
1791 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
1792 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
1793 }
1794 #ifdef JVMTI_KERNEL
1795 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
1796 warning("profiling and debugging agents are not supported with Kernel VM");
1797 } else
1798 #endif // JVMTI_KERNEL
1799 add_init_library(name, options);
1800 }
1801 // -agentlib and -agentpath
1802 } else if (match_option(option, "-agentlib:", &tail) ||
1803 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
1804 if(tail != NULL) {
1805 const char* pos = strchr(tail, '=');
1806 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
1807 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
1808 name[len] = '\0';
1810 char *options = NULL;
1811 if(pos != NULL) {
1812 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
1813 }
1814 #ifdef JVMTI_KERNEL
1815 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
1816 warning("profiling and debugging agents are not supported with Kernel VM");
1817 } else
1818 #endif // JVMTI_KERNEL
1819 add_init_agent(name, options, is_absolute_path);
1821 }
1822 // -javaagent
1823 } else if (match_option(option, "-javaagent:", &tail)) {
1824 if(tail != NULL) {
1825 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
1826 add_init_agent("instrument", options, false);
1827 }
1828 // -Xnoclassgc
1829 } else if (match_option(option, "-Xnoclassgc", &tail)) {
1830 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
1831 // -Xincgc: i-CMS
1832 } else if (match_option(option, "-Xincgc", &tail)) {
1833 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
1834 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
1835 // -Xnoincgc: no i-CMS
1836 } else if (match_option(option, "-Xnoincgc", &tail)) {
1837 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
1838 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
1839 // -Xconcgc
1840 } else if (match_option(option, "-Xconcgc", &tail)) {
1841 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
1842 // -Xnoconcgc
1843 } else if (match_option(option, "-Xnoconcgc", &tail)) {
1844 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
1845 // -Xbatch
1846 } else if (match_option(option, "-Xbatch", &tail)) {
1847 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
1848 // -Xmn for compatibility with other JVM vendors
1849 } else if (match_option(option, "-Xmn", &tail)) {
1850 jlong long_initial_eden_size = 0;
1851 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
1852 if (errcode != arg_in_range) {
1853 jio_fprintf(defaultStream::error_stream(),
1854 "Invalid initial eden size: %s\n", option->optionString);
1855 describe_range_error(errcode);
1856 return JNI_EINVAL;
1857 }
1858 FLAG_SET_CMDLINE(uintx, MaxNewSize, (size_t) long_initial_eden_size);
1859 FLAG_SET_CMDLINE(uintx, NewSize, (size_t) long_initial_eden_size);
1860 // -Xms
1861 } else if (match_option(option, "-Xms", &tail)) {
1862 jlong long_initial_heap_size = 0;
1863 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
1864 if (errcode != arg_in_range) {
1865 jio_fprintf(defaultStream::error_stream(),
1866 "Invalid initial heap size: %s\n", option->optionString);
1867 describe_range_error(errcode);
1868 return JNI_EINVAL;
1869 }
1870 set_initial_heap_size((size_t) long_initial_heap_size);
1871 // Currently the minimum size and the initial heap sizes are the same.
1872 set_min_heap_size(initial_heap_size());
1873 // -Xmx
1874 } else if (match_option(option, "-Xmx", &tail)) {
1875 jlong long_max_heap_size = 0;
1876 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
1877 if (errcode != arg_in_range) {
1878 jio_fprintf(defaultStream::error_stream(),
1879 "Invalid maximum heap size: %s\n", option->optionString);
1880 describe_range_error(errcode);
1881 return JNI_EINVAL;
1882 }
1883 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (size_t) long_max_heap_size);
1884 // Xmaxf
1885 } else if (match_option(option, "-Xmaxf", &tail)) {
1886 int maxf = (int)(atof(tail) * 100);
1887 if (maxf < 0 || maxf > 100) {
1888 jio_fprintf(defaultStream::error_stream(),
1889 "Bad max heap free percentage size: %s\n",
1890 option->optionString);
1891 return JNI_EINVAL;
1892 } else {
1893 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
1894 }
1895 // Xminf
1896 } else if (match_option(option, "-Xminf", &tail)) {
1897 int minf = (int)(atof(tail) * 100);
1898 if (minf < 0 || minf > 100) {
1899 jio_fprintf(defaultStream::error_stream(),
1900 "Bad min heap free percentage size: %s\n",
1901 option->optionString);
1902 return JNI_EINVAL;
1903 } else {
1904 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
1905 }
1906 // -Xss
1907 } else if (match_option(option, "-Xss", &tail)) {
1908 jlong long_ThreadStackSize = 0;
1909 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
1910 if (errcode != arg_in_range) {
1911 jio_fprintf(defaultStream::error_stream(),
1912 "Invalid thread stack size: %s\n", option->optionString);
1913 describe_range_error(errcode);
1914 return JNI_EINVAL;
1915 }
1916 // Internally track ThreadStackSize in units of 1024 bytes.
1917 FLAG_SET_CMDLINE(intx, ThreadStackSize,
1918 round_to((int)long_ThreadStackSize, K) / K);
1919 // -Xoss
1920 } else if (match_option(option, "-Xoss", &tail)) {
1921 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
1922 // -Xmaxjitcodesize
1923 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) {
1924 jlong long_ReservedCodeCacheSize = 0;
1925 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
1926 InitialCodeCacheSize);
1927 if (errcode != arg_in_range) {
1928 jio_fprintf(defaultStream::error_stream(),
1929 "Invalid maximum code cache size: %s\n",
1930 option->optionString);
1931 describe_range_error(errcode);
1932 return JNI_EINVAL;
1933 }
1934 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
1935 // -green
1936 } else if (match_option(option, "-green", &tail)) {
1937 jio_fprintf(defaultStream::error_stream(),
1938 "Green threads support not available\n");
1939 return JNI_EINVAL;
1940 // -native
1941 } else if (match_option(option, "-native", &tail)) {
1942 // HotSpot always uses native threads, ignore silently for compatibility
1943 // -Xsqnopause
1944 } else if (match_option(option, "-Xsqnopause", &tail)) {
1945 // EVM option, ignore silently for compatibility
1946 // -Xrs
1947 } else if (match_option(option, "-Xrs", &tail)) {
1948 // Classic/EVM option, new functionality
1949 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
1950 } else if (match_option(option, "-Xusealtsigs", &tail)) {
1951 // change default internal VM signals used - lower case for back compat
1952 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
1953 // -Xoptimize
1954 } else if (match_option(option, "-Xoptimize", &tail)) {
1955 // EVM option, ignore silently for compatibility
1956 // -Xprof
1957 } else if (match_option(option, "-Xprof", &tail)) {
1958 #ifndef FPROF_KERNEL
1959 _has_profile = true;
1960 #else // FPROF_KERNEL
1961 // do we have to exit?
1962 warning("Kernel VM does not support flat profiling.");
1963 #endif // FPROF_KERNEL
1964 // -Xaprof
1965 } else if (match_option(option, "-Xaprof", &tail)) {
1966 _has_alloc_profile = true;
1967 // -Xconcurrentio
1968 } else if (match_option(option, "-Xconcurrentio", &tail)) {
1969 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
1970 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
1971 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
1972 FLAG_SET_CMDLINE(bool, UseTLAB, false);
1973 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
1975 // -Xinternalversion
1976 } else if (match_option(option, "-Xinternalversion", &tail)) {
1977 jio_fprintf(defaultStream::output_stream(), "%s\n",
1978 VM_Version::internal_vm_info_string());
1979 vm_exit(0);
1980 #ifndef PRODUCT
1981 // -Xprintflags
1982 } else if (match_option(option, "-Xprintflags", &tail)) {
1983 CommandLineFlags::printFlags();
1984 vm_exit(0);
1985 #endif
1986 // -D
1987 } else if (match_option(option, "-D", &tail)) {
1988 if (!add_property(tail)) {
1989 return JNI_ENOMEM;
1990 }
1991 // Out of the box management support
1992 if (match_option(option, "-Dcom.sun.management", &tail)) {
1993 FLAG_SET_CMDLINE(bool, ManagementServer, true);
1994 }
1995 // -Xint
1996 } else if (match_option(option, "-Xint", &tail)) {
1997 set_mode_flags(_int);
1998 // -Xmixed
1999 } else if (match_option(option, "-Xmixed", &tail)) {
2000 set_mode_flags(_mixed);
2001 // -Xcomp
2002 } else if (match_option(option, "-Xcomp", &tail)) {
2003 // for testing the compiler; turn off all flags that inhibit compilation
2004 set_mode_flags(_comp);
2006 // -Xshare:dump
2007 } else if (match_option(option, "-Xshare:dump", &tail)) {
2008 #ifdef TIERED
2009 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2010 set_mode_flags(_int); // Prevent compilation, which creates objects
2011 #elif defined(COMPILER2)
2012 vm_exit_during_initialization(
2013 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2014 #elif defined(KERNEL)
2015 vm_exit_during_initialization(
2016 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2017 #else
2018 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2019 set_mode_flags(_int); // Prevent compilation, which creates objects
2020 #endif
2021 // -Xshare:on
2022 } else if (match_option(option, "-Xshare:on", &tail)) {
2023 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2024 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2025 #ifdef TIERED
2026 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2027 #endif // TIERED
2028 // -Xshare:auto
2029 } else if (match_option(option, "-Xshare:auto", &tail)) {
2030 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2031 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2032 // -Xshare:off
2033 } else if (match_option(option, "-Xshare:off", &tail)) {
2034 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2035 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2037 // -Xverify
2038 } else if (match_option(option, "-Xverify", &tail)) {
2039 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2040 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2041 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2042 } else if (strcmp(tail, ":remote") == 0) {
2043 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2044 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2045 } else if (strcmp(tail, ":none") == 0) {
2046 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2047 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2048 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2049 return JNI_EINVAL;
2050 }
2051 // -Xdebug
2052 } else if (match_option(option, "-Xdebug", &tail)) {
2053 // note this flag has been used, then ignore
2054 set_xdebug_mode(true);
2055 // -Xnoagent
2056 } else if (match_option(option, "-Xnoagent", &tail)) {
2057 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2058 } else if (match_option(option, "-Xboundthreads", &tail)) {
2059 // Bind user level threads to kernel threads (Solaris only)
2060 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2061 } else if (match_option(option, "-Xloggc:", &tail)) {
2062 // Redirect GC output to the file. -Xloggc:<filename>
2063 // ostream_init_log(), when called will use this filename
2064 // to initialize a fileStream.
2065 _gc_log_filename = strdup(tail);
2066 FLAG_SET_CMDLINE(bool, PrintGC, true);
2067 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2068 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2070 // JNI hooks
2071 } else if (match_option(option, "-Xcheck", &tail)) {
2072 if (!strcmp(tail, ":jni")) {
2073 CheckJNICalls = true;
2074 } else if (is_bad_option(option, args->ignoreUnrecognized,
2075 "check")) {
2076 return JNI_EINVAL;
2077 }
2078 } else if (match_option(option, "vfprintf", &tail)) {
2079 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2080 } else if (match_option(option, "exit", &tail)) {
2081 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2082 } else if (match_option(option, "abort", &tail)) {
2083 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2084 // -XX:+AggressiveHeap
2085 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2087 // This option inspects the machine and attempts to set various
2088 // parameters to be optimal for long-running, memory allocation
2089 // intensive jobs. It is intended for machines with large
2090 // amounts of cpu and memory.
2092 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2093 // VM, but we may not be able to represent the total physical memory
2094 // available (like having 8gb of memory on a box but using a 32bit VM).
2095 // Thus, we need to make sure we're using a julong for intermediate
2096 // calculations.
2097 julong initHeapSize;
2098 julong total_memory = os::physical_memory();
2100 if (total_memory < (julong)256*M) {
2101 jio_fprintf(defaultStream::error_stream(),
2102 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2103 vm_exit(1);
2104 }
2106 // The heap size is half of available memory, or (at most)
2107 // all of possible memory less 160mb (leaving room for the OS
2108 // when using ISM). This is the maximum; because adaptive sizing
2109 // is turned on below, the actual space used may be smaller.
2111 initHeapSize = MIN2(total_memory / (julong)2,
2112 total_memory - (julong)160*M);
2114 // Make sure that if we have a lot of memory we cap the 32 bit
2115 // process space. The 64bit VM version of this function is a nop.
2116 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2118 // The perm gen is separate but contiguous with the
2119 // object heap (and is reserved with it) so subtract it
2120 // from the heap size.
2121 if (initHeapSize > MaxPermSize) {
2122 initHeapSize = initHeapSize - MaxPermSize;
2123 } else {
2124 warning("AggressiveHeap and MaxPermSize values may conflict");
2125 }
2127 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2128 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2129 set_initial_heap_size(MaxHeapSize);
2130 // Currently the minimum size and the initial heap sizes are the same.
2131 set_min_heap_size(initial_heap_size());
2132 }
2133 if (FLAG_IS_DEFAULT(NewSize)) {
2134 // Make the young generation 3/8ths of the total heap.
2135 FLAG_SET_CMDLINE(uintx, NewSize,
2136 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2137 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2138 }
2140 FLAG_SET_DEFAULT(UseLargePages, true);
2142 // Increase some data structure sizes for efficiency
2143 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2144 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2145 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2147 // See the OldPLABSize comment below, but replace 'after promotion'
2148 // with 'after copying'. YoungPLABSize is the size of the survivor
2149 // space per-gc-thread buffers. The default is 4kw.
2150 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2152 // OldPLABSize is the size of the buffers in the old gen that
2153 // UseParallelGC uses to promote live data that doesn't fit in the
2154 // survivor spaces. At any given time, there's one for each gc thread.
2155 // The default size is 1kw. These buffers are rarely used, since the
2156 // survivor spaces are usually big enough. For specjbb, however, there
2157 // are occasions when there's lots of live data in the young gen
2158 // and we end up promoting some of it. We don't have a definite
2159 // explanation for why bumping OldPLABSize helps, but the theory
2160 // is that a bigger PLAB results in retaining something like the
2161 // original allocation order after promotion, which improves mutator
2162 // locality. A minor effect may be that larger PLABs reduce the
2163 // number of PLAB allocation events during gc. The value of 8kw
2164 // was arrived at by experimenting with specjbb.
2165 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2167 // CompilationPolicyChoice=0 causes the server compiler to adopt
2168 // a more conservative which-method-do-I-compile policy when one
2169 // of the counters maintained by the interpreter trips. The
2170 // result is reduced startup time and improved specjbb and
2171 // alacrity performance. Zero is the default, but we set it
2172 // explicitly here in case the default changes.
2173 // See runtime/compilationPolicy.*.
2174 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2176 // Enable parallel GC and adaptive generation sizing
2177 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2178 FLAG_SET_DEFAULT(ParallelGCThreads,
2179 Abstract_VM_Version::parallel_worker_threads());
2181 // Encourage steady state memory management
2182 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2184 // This appears to improve mutator locality
2185 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2187 // Get around early Solaris scheduling bug
2188 // (affinity vs other jobs on system)
2189 // but disallow DR and offlining (5008695).
2190 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2192 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2193 // The last option must always win.
2194 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2195 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2196 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2197 // The last option must always win.
2198 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2199 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2200 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2201 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2202 jio_fprintf(defaultStream::error_stream(),
2203 "Please use CMSClassUnloadingEnabled in place of "
2204 "CMSPermGenSweepingEnabled in the future\n");
2205 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2206 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2207 jio_fprintf(defaultStream::error_stream(),
2208 "Please use -XX:+UseGCOverheadLimit in place of "
2209 "-XX:+UseGCTimeLimit in the future\n");
2210 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2211 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2212 jio_fprintf(defaultStream::error_stream(),
2213 "Please use -XX:-UseGCOverheadLimit in place of "
2214 "-XX:-UseGCTimeLimit in the future\n");
2215 // The TLE options are for compatibility with 1.3 and will be
2216 // removed without notice in a future release. These options
2217 // are not to be documented.
2218 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2219 // No longer used.
2220 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2221 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2222 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2223 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2224 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2225 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2226 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2227 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2228 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2229 // No longer used.
2230 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2231 jlong long_tlab_size = 0;
2232 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2233 if (errcode != arg_in_range) {
2234 jio_fprintf(defaultStream::error_stream(),
2235 "Invalid TLAB size: %s\n", option->optionString);
2236 describe_range_error(errcode);
2237 return JNI_EINVAL;
2238 }
2239 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2240 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2241 // No longer used.
2242 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2243 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2244 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2245 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2246 SOLARIS_ONLY(
2247 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2248 warning("-XX:+UsePermISM is obsolete.");
2249 FLAG_SET_CMDLINE(bool, UseISM, true);
2250 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2251 FLAG_SET_CMDLINE(bool, UseISM, false);
2252 )
2253 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2254 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2255 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2256 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2257 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2258 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2259 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2260 #ifdef SOLARIS
2261 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2262 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2263 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2264 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2265 #else // ndef SOLARIS
2266 jio_fprintf(defaultStream::error_stream(),
2267 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2268 return JNI_EINVAL;
2269 #endif // ndef SOLARIS
2270 } else
2271 #ifdef ASSERT
2272 if (match_option(option, "-XX:+FullGCALot", &tail)) {
2273 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2274 // disable scavenge before parallel mark-compact
2275 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2276 } else
2277 #endif
2278 if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2279 julong cms_blocks_to_claim = (julong)atol(tail);
2280 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2281 jio_fprintf(defaultStream::error_stream(),
2282 "Please use -XX:CMSParPromoteBlocksToClaim in place of "
2283 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2284 } else
2285 if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2286 jlong old_plab_size = 0;
2287 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2288 if (errcode != arg_in_range) {
2289 jio_fprintf(defaultStream::error_stream(),
2290 "Invalid old PLAB size: %s\n", option->optionString);
2291 describe_range_error(errcode);
2292 return JNI_EINVAL;
2293 }
2294 FLAG_SET_CMDLINE(uintx, OldPLABSize, (julong)old_plab_size);
2295 jio_fprintf(defaultStream::error_stream(),
2296 "Please use -XX:OldPLABSize in place of "
2297 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2298 } else
2299 if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2300 jlong young_plab_size = 0;
2301 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2302 if (errcode != arg_in_range) {
2303 jio_fprintf(defaultStream::error_stream(),
2304 "Invalid young PLAB size: %s\n", option->optionString);
2305 describe_range_error(errcode);
2306 return JNI_EINVAL;
2307 }
2308 FLAG_SET_CMDLINE(uintx, YoungPLABSize, (julong)young_plab_size);
2309 jio_fprintf(defaultStream::error_stream(),
2310 "Please use -XX:YoungPLABSize in place of "
2311 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2312 } else
2313 if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2314 // Skip -XX:Flags= since that case has already been handled
2315 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2316 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2317 return JNI_EINVAL;
2318 }
2319 }
2320 // Unknown option
2321 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2322 return JNI_ERR;
2323 }
2324 }
2325 // Change the default value for flags which have different default values
2326 // when working with older JDKs.
2327 if (JDK_Version::current().compare_major(6) <= 0 &&
2328 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2329 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2330 }
2331 return JNI_OK;
2332 }
2334 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2335 // This must be done after all -D arguments have been processed.
2336 scp_p->expand_endorsed();
2338 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2339 // Assemble the bootclasspath elements into the final path.
2340 Arguments::set_sysclasspath(scp_p->combined_path());
2341 }
2343 // This must be done after all arguments have been processed.
2344 // java_compiler() true means set to "NONE" or empty.
2345 if (java_compiler() && !xdebug_mode()) {
2346 // For backwards compatibility, we switch to interpreted mode if
2347 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2348 // not specified.
2349 set_mode_flags(_int);
2350 }
2351 if (CompileThreshold == 0) {
2352 set_mode_flags(_int);
2353 }
2355 #ifdef TIERED
2356 // If we are using tiered compilation in the tiered vm then c1 will
2357 // do the profiling and we don't want to waste that time in the
2358 // interpreter.
2359 if (TieredCompilation) {
2360 ProfileInterpreter = false;
2361 } else {
2362 // Since we are running vanilla server we must adjust the compile threshold
2363 // unless the user has already adjusted it because the default threshold assumes
2364 // we will run tiered.
2366 if (FLAG_IS_DEFAULT(CompileThreshold)) {
2367 CompileThreshold = Tier2CompileThreshold;
2368 }
2369 }
2370 #endif // TIERED
2372 #ifndef COMPILER2
2373 // Don't degrade server performance for footprint
2374 if (FLAG_IS_DEFAULT(UseLargePages) &&
2375 MaxHeapSize < LargePageHeapSizeThreshold) {
2376 // No need for large granularity pages w/small heaps.
2377 // Note that large pages are enabled/disabled for both the
2378 // Java heap and the code cache.
2379 FLAG_SET_DEFAULT(UseLargePages, false);
2380 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2381 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2382 }
2384 #else
2385 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2386 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2387 }
2388 // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2389 if (UseG1GC) {
2390 FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2391 }
2392 #endif
2394 if (!check_vm_args_consistency()) {
2395 return JNI_ERR;
2396 }
2398 return JNI_OK;
2399 }
2401 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2402 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2403 scp_assembly_required_p);
2404 }
2406 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2407 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2408 scp_assembly_required_p);
2409 }
2411 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2412 const int N_MAX_OPTIONS = 64;
2413 const int OPTION_BUFFER_SIZE = 1024;
2414 char buffer[OPTION_BUFFER_SIZE];
2416 // The variable will be ignored if it exceeds the length of the buffer.
2417 // Don't check this variable if user has special privileges
2418 // (e.g. unix su command).
2419 if (os::getenv(name, buffer, sizeof(buffer)) &&
2420 !os::have_special_privileges()) {
2421 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2422 jio_fprintf(defaultStream::error_stream(),
2423 "Picked up %s: %s\n", name, buffer);
2424 char* rd = buffer; // pointer to the input string (rd)
2425 int i;
2426 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2427 while (isspace(*rd)) rd++; // skip whitespace
2428 if (*rd == 0) break; // we re done when the input string is read completely
2430 // The output, option string, overwrites the input string.
2431 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2432 // input string (rd).
2433 char* wrt = rd;
2435 options[i++].optionString = wrt; // Fill in option
2436 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2437 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2438 int quote = *rd; // matching quote to look for
2439 rd++; // don't copy open quote
2440 while (*rd != quote) { // include everything (even spaces) up until quote
2441 if (*rd == 0) { // string termination means unmatched string
2442 jio_fprintf(defaultStream::error_stream(),
2443 "Unmatched quote in %s\n", name);
2444 return JNI_ERR;
2445 }
2446 *wrt++ = *rd++; // copy to option string
2447 }
2448 rd++; // don't copy close quote
2449 } else {
2450 *wrt++ = *rd++; // copy to option string
2451 }
2452 }
2453 // Need to check if we're done before writing a NULL,
2454 // because the write could be to the byte that rd is pointing to.
2455 if (*rd++ == 0) {
2456 *wrt = 0;
2457 break;
2458 }
2459 *wrt = 0; // Zero terminate option
2460 }
2461 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2462 JavaVMInitArgs vm_args;
2463 vm_args.version = JNI_VERSION_1_2;
2464 vm_args.options = options;
2465 vm_args.nOptions = i;
2466 vm_args.ignoreUnrecognized = false;
2468 if (PrintVMOptions) {
2469 const char* tail;
2470 for (int i = 0; i < vm_args.nOptions; i++) {
2471 const JavaVMOption *option = vm_args.options + i;
2472 if (match_option(option, "-XX:", &tail)) {
2473 logOption(tail);
2474 }
2475 }
2476 }
2478 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2479 }
2480 return JNI_OK;
2481 }
2483 // Parse entry point called from JNI_CreateJavaVM
2485 jint Arguments::parse(const JavaVMInitArgs* args) {
2487 // Sharing support
2488 // Construct the path to the archive
2489 char jvm_path[JVM_MAXPATHLEN];
2490 os::jvm_path(jvm_path, sizeof(jvm_path));
2491 #ifdef TIERED
2492 if (strstr(jvm_path, "client") != NULL) {
2493 force_client_mode = true;
2494 }
2495 #endif // TIERED
2496 char *end = strrchr(jvm_path, *os::file_separator());
2497 if (end != NULL) *end = '\0';
2498 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2499 strlen(os::file_separator()) + 20);
2500 if (shared_archive_path == NULL) return JNI_ENOMEM;
2501 strcpy(shared_archive_path, jvm_path);
2502 strcat(shared_archive_path, os::file_separator());
2503 strcat(shared_archive_path, "classes");
2504 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2505 strcat(shared_archive_path, ".jsa");
2506 SharedArchivePath = shared_archive_path;
2508 // Remaining part of option string
2509 const char* tail;
2511 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2512 bool settings_file_specified = false;
2513 int index;
2514 for (index = 0; index < args->nOptions; index++) {
2515 const JavaVMOption *option = args->options + index;
2516 if (match_option(option, "-XX:Flags=", &tail)) {
2517 if (!process_settings_file(tail, true, args->ignoreUnrecognized)) {
2518 return JNI_EINVAL;
2519 }
2520 settings_file_specified = true;
2521 }
2522 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2523 PrintVMOptions = true;
2524 }
2525 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2526 PrintVMOptions = false;
2527 }
2528 }
2530 // Parse default .hotspotrc settings file
2531 if (!settings_file_specified) {
2532 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2533 return JNI_EINVAL;
2534 }
2535 }
2537 if (PrintVMOptions) {
2538 for (index = 0; index < args->nOptions; index++) {
2539 const JavaVMOption *option = args->options + index;
2540 if (match_option(option, "-XX:", &tail)) {
2541 logOption(tail);
2542 }
2543 }
2544 }
2547 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
2548 jint result = parse_vm_init_args(args);
2549 if (result != JNI_OK) {
2550 return result;
2551 }
2553 // These are hacks until G1 is fully supported and tested
2554 // but lets you force -XX:+UseG1GC in PRT and get it where it (mostly) works
2555 if (UseG1GC) {
2556 if (UseConcMarkSweepGC || UseParNewGC || UseParallelGC || UseParallelOldGC || UseSerialGC) {
2557 #ifndef PRODUCT
2558 tty->print_cr("-XX:+UseG1GC is incompatible with other collectors, using UseG1GC");
2559 #endif // PRODUCT
2560 UseConcMarkSweepGC = false;
2561 UseParNewGC = false;
2562 UseParallelGC = false;
2563 UseParallelOldGC = false;
2564 UseSerialGC = false;
2565 }
2566 no_shared_spaces();
2567 }
2569 #ifndef PRODUCT
2570 if (TraceBytecodesAt != 0) {
2571 TraceBytecodes = true;
2572 }
2573 if (CountCompiledCalls) {
2574 if (UseCounterDecay) {
2575 warning("UseCounterDecay disabled because CountCalls is set");
2576 UseCounterDecay = false;
2577 }
2578 }
2579 #endif // PRODUCT
2581 if (PrintGCDetails) {
2582 // Turn on -verbose:gc options as well
2583 PrintGC = true;
2584 if (FLAG_IS_DEFAULT(TraceClassUnloading)) {
2585 TraceClassUnloading = true;
2586 }
2587 }
2589 #ifdef SERIALGC
2590 set_serial_gc_flags();
2591 #endif // SERIALGC
2592 #ifdef KERNEL
2593 no_shared_spaces();
2594 #endif // KERNEL
2596 // Set flags based on ergonomics.
2597 set_ergonomics_flags();
2599 // Check the GC selections again.
2600 if (!check_gc_consistency()) {
2601 return JNI_EINVAL;
2602 }
2604 if (UseParallelGC || UseParallelOldGC) {
2605 // Set some flags for ParallelGC if needed.
2606 set_parallel_gc_flags();
2607 } else if (UseConcMarkSweepGC) {
2608 // Set some flags for CMS
2609 set_cms_and_parnew_gc_flags();
2610 } else if (UseParNewGC) {
2611 // Set some flags for ParNew
2612 set_parnew_gc_flags();
2613 }
2614 // Temporary; make the "if" an "else-if" before
2615 // we integrate G1. XXX
2616 if (UseG1GC) {
2617 // Set some flags for garbage-first, if needed.
2618 set_g1_gc_flags();
2619 }
2621 #ifdef SERIALGC
2622 assert(verify_serial_gc_flags(), "SerialGC unset");
2623 #endif // SERIALGC
2625 // Set bytecode rewriting flags
2626 set_bytecode_flags();
2628 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
2629 set_aggressive_opts_flags();
2631 #ifdef CC_INTERP
2632 // Biased locking is not implemented with c++ interpreter
2633 FLAG_SET_DEFAULT(UseBiasedLocking, false);
2634 #endif /* CC_INTERP */
2636 #ifdef COMPILER2
2637 if (!UseBiasedLocking || EmitSync != 0) {
2638 UseOptoBiasInlining = false;
2639 }
2640 #endif
2642 if (PrintCommandLineFlags) {
2643 CommandLineFlags::printSetFlags();
2644 }
2646 #ifdef ASSERT
2647 if (PrintFlagsFinal) {
2648 CommandLineFlags::printFlags();
2649 }
2650 #endif
2652 return JNI_OK;
2653 }
2655 int Arguments::PropertyList_count(SystemProperty* pl) {
2656 int count = 0;
2657 while(pl != NULL) {
2658 count++;
2659 pl = pl->next();
2660 }
2661 return count;
2662 }
2664 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
2665 assert(key != NULL, "just checking");
2666 SystemProperty* prop;
2667 for (prop = pl; prop != NULL; prop = prop->next()) {
2668 if (strcmp(key, prop->key()) == 0) return prop->value();
2669 }
2670 return NULL;
2671 }
2673 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
2674 int count = 0;
2675 const char* ret_val = NULL;
2677 while(pl != NULL) {
2678 if(count >= index) {
2679 ret_val = pl->key();
2680 break;
2681 }
2682 count++;
2683 pl = pl->next();
2684 }
2686 return ret_val;
2687 }
2689 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
2690 int count = 0;
2691 char* ret_val = NULL;
2693 while(pl != NULL) {
2694 if(count >= index) {
2695 ret_val = pl->value();
2696 break;
2697 }
2698 count++;
2699 pl = pl->next();
2700 }
2702 return ret_val;
2703 }
2705 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
2706 SystemProperty* p = *plist;
2707 if (p == NULL) {
2708 *plist = new_p;
2709 } else {
2710 while (p->next() != NULL) {
2711 p = p->next();
2712 }
2713 p->set_next(new_p);
2714 }
2715 }
2717 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
2718 if (plist == NULL)
2719 return;
2721 SystemProperty* new_p = new SystemProperty(k, v, true);
2722 PropertyList_add(plist, new_p);
2723 }
2725 // This add maintains unique property key in the list.
2726 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v) {
2727 if (plist == NULL)
2728 return;
2730 // If property key exist then update with new value.
2731 SystemProperty* prop;
2732 for (prop = *plist; prop != NULL; prop = prop->next()) {
2733 if (strcmp(k, prop->key()) == 0) {
2734 prop->set_value(v);
2735 return;
2736 }
2737 }
2739 PropertyList_add(plist, k, v);
2740 }
2742 #ifdef KERNEL
2743 char *Arguments::get_kernel_properties() {
2744 // Find properties starting with kernel and append them to string
2745 // We need to find out how long they are first because the URL's that they
2746 // might point to could get long.
2747 int length = 0;
2748 SystemProperty* prop;
2749 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
2750 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
2751 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
2752 }
2753 }
2754 // Add one for null terminator.
2755 char *props = AllocateHeap(length + 1, "get_kernel_properties");
2756 if (length != 0) {
2757 int pos = 0;
2758 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
2759 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
2760 jio_snprintf(&props[pos], length-pos,
2761 "-D%s=%s ", prop->key(), prop->value());
2762 pos = strlen(props);
2763 }
2764 }
2765 }
2766 // null terminate props in case of null
2767 props[length] = '\0';
2768 return props;
2769 }
2770 #endif // KERNEL
2772 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
2773 // Returns true if all of the source pointed by src has been copied over to
2774 // the destination buffer pointed by buf. Otherwise, returns false.
2775 // Notes:
2776 // 1. If the length (buflen) of the destination buffer excluding the
2777 // NULL terminator character is not long enough for holding the expanded
2778 // pid characters, it also returns false instead of returning the partially
2779 // expanded one.
2780 // 2. The passed in "buflen" should be large enough to hold the null terminator.
2781 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
2782 char* buf, size_t buflen) {
2783 const char* p = src;
2784 char* b = buf;
2785 const char* src_end = &src[srclen];
2786 char* buf_end = &buf[buflen - 1];
2788 while (p < src_end && b < buf_end) {
2789 if (*p == '%') {
2790 switch (*(++p)) {
2791 case '%': // "%%" ==> "%"
2792 *b++ = *p++;
2793 break;
2794 case 'p': { // "%p" ==> current process id
2795 // buf_end points to the character before the last character so
2796 // that we could write '\0' to the end of the buffer.
2797 size_t buf_sz = buf_end - b + 1;
2798 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
2800 // if jio_snprintf fails or the buffer is not long enough to hold
2801 // the expanded pid, returns false.
2802 if (ret < 0 || ret >= (int)buf_sz) {
2803 return false;
2804 } else {
2805 b += ret;
2806 assert(*b == '\0', "fail in copy_expand_pid");
2807 if (p == src_end && b == buf_end + 1) {
2808 // reach the end of the buffer.
2809 return true;
2810 }
2811 }
2812 p++;
2813 break;
2814 }
2815 default :
2816 *b++ = '%';
2817 }
2818 } else {
2819 *b++ = *p++;
2820 }
2821 }
2822 *b = '\0';
2823 return (p == src_end); // return false if not all of the source was copied
2824 }