1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "compiler/compilerOracle.hpp"
28 #include "memory/allocation.inline.hpp"
29 #include "memory/cardTableRS.hpp"
30 #include "memory/referenceProcessor.hpp"
31 #include "memory/universe.inline.hpp"
32 #include "oops/oop.inline.hpp"
33 #include "prims/jvmtiExport.hpp"
34 #include "runtime/arguments.hpp"
35 #include "runtime/globals_extension.hpp"
36 #include "runtime/java.hpp"
37 #include "services/management.hpp"
38 #include "utilities/defaultStream.hpp"
39 #include "utilities/taskqueue.hpp"
40 #ifdef TARGET_OS_FAMILY_linux
41 # include "os_linux.inline.hpp"
42 #endif
43 #ifdef TARGET_OS_FAMILY_solaris
44 # include "os_solaris.inline.hpp"
45 #endif
46 #ifdef TARGET_OS_FAMILY_windows
47 # include "os_windows.inline.hpp"
48 #endif
49 #ifdef TARGET_OS_FAMILY_bsd
50 # include "os_bsd.inline.hpp"
51 #endif
52 #ifndef SERIALGC
53 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
54 #endif
55
56 // Note: This is a special bug reporting site for the JVM
57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
58 #define DEFAULT_JAVA_LAUNCHER "generic"
59
60 char** Arguments::_jvm_flags_array = NULL;
61 int Arguments::_num_jvm_flags = 0;
62 char** Arguments::_jvm_args_array = NULL;
63 int Arguments::_num_jvm_args = 0;
64 char* Arguments::_java_command = NULL;
65 SystemProperty* Arguments::_system_properties = NULL;
66 const char* Arguments::_gc_log_filename = NULL;
67 bool Arguments::_has_profile = false;
68 bool Arguments::_has_alloc_profile = false;
69 uintx Arguments::_min_heap_size = 0;
70 Arguments::Mode Arguments::_mode = _mixed;
71 bool Arguments::_java_compiler = false;
72 bool Arguments::_xdebug_mode = false;
73 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
74 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
75 int Arguments::_sun_java_launcher_pid = -1;
76 bool Arguments::_created_by_gamma_launcher = false;
77
78 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
79 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
80 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
81 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
82 bool Arguments::_ClipInlining = ClipInlining;
83
84 char* Arguments::SharedArchivePath = NULL;
85
86 AgentLibraryList Arguments::_libraryList;
87 AgentLibraryList Arguments::_agentList;
88
89 abort_hook_t Arguments::_abort_hook = NULL;
90 exit_hook_t Arguments::_exit_hook = NULL;
91 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
92
93
94 SystemProperty *Arguments::_java_ext_dirs = NULL;
95 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
96 SystemProperty *Arguments::_sun_boot_library_path = NULL;
97 SystemProperty *Arguments::_java_library_path = NULL;
98 SystemProperty *Arguments::_java_home = NULL;
99 SystemProperty *Arguments::_java_class_path = NULL;
100 SystemProperty *Arguments::_sun_boot_class_path = NULL;
101
102 char* Arguments::_meta_index_path = NULL;
103 char* Arguments::_meta_index_dir = NULL;
104
105 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
106
107 static bool match_option(const JavaVMOption *option, const char* name,
108 const char** tail) {
109 int len = (int)strlen(name);
110 if (strncmp(option->optionString, name, len) == 0) {
111 *tail = option->optionString + len;
112 return true;
113 } else {
114 return false;
115 }
116 }
117
118 static void logOption(const char* opt) {
119 if (PrintVMOptions) {
120 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
121 }
122 }
123
124 // Process java launcher properties.
125 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
126 // See if sun.java.launcher or sun.java.launcher.pid is defined.
127 // Must do this before setting up other system properties,
128 // as some of them may depend on launcher type.
129 for (int index = 0; index < args->nOptions; index++) {
130 const JavaVMOption* option = args->options + index;
131 const char* tail;
132
133 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
134 process_java_launcher_argument(tail, option->extraInfo);
135 continue;
136 }
137 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
138 _sun_java_launcher_pid = atoi(tail);
139 continue;
140 }
141 }
142 }
143
144 // Initialize system properties key and value.
145 void Arguments::init_system_properties() {
146
147 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
148 "Java Virtual Machine Specification", false));
149 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
150 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
152
153 // following are JVMTI agent writeable properties.
154 // Properties values are set to NULL and they are
155 // os specific they are initialized in os::init_system_properties_values().
156 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
157 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
158 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
159 _java_library_path = new SystemProperty("java.library.path", NULL, true);
160 _java_home = new SystemProperty("java.home", NULL, true);
161 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
162
163 _java_class_path = new SystemProperty("java.class.path", "", true);
164
165 // Add to System Property list.
166 PropertyList_add(&_system_properties, _java_ext_dirs);
167 PropertyList_add(&_system_properties, _java_endorsed_dirs);
168 PropertyList_add(&_system_properties, _sun_boot_library_path);
169 PropertyList_add(&_system_properties, _java_library_path);
170 PropertyList_add(&_system_properties, _java_home);
171 PropertyList_add(&_system_properties, _java_class_path);
172 PropertyList_add(&_system_properties, _sun_boot_class_path);
173
174 // Set OS specific system properties values
175 os::init_system_properties_values();
176 }
177
178
179 // Update/Initialize System properties after JDK version number is known
180 void Arguments::init_version_specific_system_properties() {
181 enum { bufsz = 16 };
182 char buffer[bufsz];
183 const char* spec_vendor = "Sun Microsystems Inc.";
184 uint32_t spec_version = 0;
185
186 if (JDK_Version::is_gte_jdk17x_version()) {
187 spec_vendor = "Oracle Corporation";
188 spec_version = JDK_Version::current().major_version();
189 }
190 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
191
192 PropertyList_add(&_system_properties,
193 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
194 PropertyList_add(&_system_properties,
195 new SystemProperty("java.vm.specification.version", buffer, false));
196 PropertyList_add(&_system_properties,
197 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
198 }
199
200 /**
201 * Provide a slightly more user-friendly way of eliminating -XX flags.
202 * When a flag is eliminated, it can be added to this list in order to
203 * continue accepting this flag on the command-line, while issuing a warning
204 * and ignoring the value. Once the JDK version reaches the 'accept_until'
205 * limit, we flatly refuse to admit the existence of the flag. This allows
206 * a flag to die correctly over JDK releases using HSX.
207 */
208 typedef struct {
209 const char* name;
210 JDK_Version obsoleted_in; // when the flag went away
211 JDK_Version accept_until; // which version to start denying the existence
212 } ObsoleteFlag;
213
214 static ObsoleteFlag obsolete_jvm_flags[] = {
215 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
216 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
217 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
218 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
229 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
230 { "DefaultInitialRAMFraction",
231 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
232 { "UseDepthFirstScavengeOrder",
233 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
234 { "HandlePromotionFailure",
235 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
236 { "MaxLiveObjectEvacuationRatio",
237 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
238 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
239 { "UseParallelOldGCCompacting",
240 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
241 { "UseParallelDensePrefixUpdate",
242 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
243 { "UseParallelOldGCDensePrefix",
244 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
245 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
246 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
247 #ifdef PRODUCT
248 { "DesiredMethodLimit",
249 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
250 #endif // PRODUCT
251 { NULL, JDK_Version(0), JDK_Version(0) }
252 };
253
254 // Returns true if the flag is obsolete and fits into the range specified
255 // for being ignored. In the case that the flag is ignored, the 'version'
256 // value is filled in with the version number when the flag became
257 // obsolete so that that value can be displayed to the user.
258 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
259 int i = 0;
260 assert(version != NULL, "Must provide a version buffer");
261 while (obsolete_jvm_flags[i].name != NULL) {
262 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
263 // <flag>=xxx form
264 // [-|+]<flag> form
265 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
266 ((s[0] == '+' || s[0] == '-') &&
267 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
268 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
269 *version = flag_status.obsoleted_in;
270 return true;
271 }
272 }
273 i++;
274 }
275 return false;
276 }
277
278 // Constructs the system class path (aka boot class path) from the following
279 // components, in order:
280 //
281 // prefix // from -Xbootclasspath/p:...
282 // endorsed // the expansion of -Djava.endorsed.dirs=...
283 // base // from os::get_system_properties() or -Xbootclasspath=
284 // suffix // from -Xbootclasspath/a:...
285 //
286 // java.endorsed.dirs is a list of directories; any jar or zip files in the
287 // directories are added to the sysclasspath just before the base.
288 //
289 // This could be AllStatic, but it isn't needed after argument processing is
290 // complete.
291 class SysClassPath: public StackObj {
292 public:
293 SysClassPath(const char* base);
294 ~SysClassPath();
295
296 inline void set_base(const char* base);
297 inline void add_prefix(const char* prefix);
298 inline void add_suffix_to_prefix(const char* suffix);
299 inline void add_suffix(const char* suffix);
300 inline void reset_path(const char* base);
301
302 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
303 // property. Must be called after all command-line arguments have been
304 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
305 // combined_path().
306 void expand_endorsed();
307
308 inline const char* get_base() const { return _items[_scp_base]; }
309 inline const char* get_prefix() const { return _items[_scp_prefix]; }
310 inline const char* get_suffix() const { return _items[_scp_suffix]; }
311 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
312
313 // Combine all the components into a single c-heap-allocated string; caller
314 // must free the string if/when no longer needed.
315 char* combined_path();
316
317 private:
318 // Utility routines.
319 static char* add_to_path(const char* path, const char* str, bool prepend);
320 static char* add_jars_to_path(char* path, const char* directory);
321
322 inline void reset_item_at(int index);
323
324 // Array indices for the items that make up the sysclasspath. All except the
325 // base are allocated in the C heap and freed by this class.
326 enum {
327 _scp_prefix, // from -Xbootclasspath/p:...
328 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
329 _scp_base, // the default sysclasspath
330 _scp_suffix, // from -Xbootclasspath/a:...
331 _scp_nitems // the number of items, must be last.
332 };
333
334 const char* _items[_scp_nitems];
335 DEBUG_ONLY(bool _expansion_done;)
336 };
337
338 SysClassPath::SysClassPath(const char* base) {
339 memset(_items, 0, sizeof(_items));
340 _items[_scp_base] = base;
341 DEBUG_ONLY(_expansion_done = false;)
342 }
343
344 SysClassPath::~SysClassPath() {
345 // Free everything except the base.
346 for (int i = 0; i < _scp_nitems; ++i) {
347 if (i != _scp_base) reset_item_at(i);
348 }
349 DEBUG_ONLY(_expansion_done = false;)
350 }
351
352 inline void SysClassPath::set_base(const char* base) {
353 _items[_scp_base] = base;
354 }
355
356 inline void SysClassPath::add_prefix(const char* prefix) {
357 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
358 }
359
360 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
361 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
362 }
363
364 inline void SysClassPath::add_suffix(const char* suffix) {
365 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
366 }
367
368 inline void SysClassPath::reset_item_at(int index) {
369 assert(index < _scp_nitems && index != _scp_base, "just checking");
370 if (_items[index] != NULL) {
371 FREE_C_HEAP_ARRAY(char, _items[index]);
372 _items[index] = NULL;
373 }
374 }
375
376 inline void SysClassPath::reset_path(const char* base) {
377 // Clear the prefix and suffix.
378 reset_item_at(_scp_prefix);
379 reset_item_at(_scp_suffix);
380 set_base(base);
381 }
382
383 //------------------------------------------------------------------------------
384
385 void SysClassPath::expand_endorsed() {
386 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
387
388 const char* path = Arguments::get_property("java.endorsed.dirs");
389 if (path == NULL) {
390 path = Arguments::get_endorsed_dir();
391 assert(path != NULL, "no default for java.endorsed.dirs");
392 }
393
394 char* expanded_path = NULL;
395 const char separator = *os::path_separator();
396 const char* const end = path + strlen(path);
397 while (path < end) {
398 const char* tmp_end = strchr(path, separator);
399 if (tmp_end == NULL) {
400 expanded_path = add_jars_to_path(expanded_path, path);
401 path = end;
402 } else {
403 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
404 memcpy(dirpath, path, tmp_end - path);
405 dirpath[tmp_end - path] = '\0';
406 expanded_path = add_jars_to_path(expanded_path, dirpath);
407 FREE_C_HEAP_ARRAY(char, dirpath);
408 path = tmp_end + 1;
409 }
410 }
411 _items[_scp_endorsed] = expanded_path;
412 DEBUG_ONLY(_expansion_done = true;)
413 }
414
415 // Combine the bootclasspath elements, some of which may be null, into a single
416 // c-heap-allocated string.
417 char* SysClassPath::combined_path() {
418 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
419 assert(_expansion_done, "must call expand_endorsed() first.");
420
421 size_t lengths[_scp_nitems];
422 size_t total_len = 0;
423
424 const char separator = *os::path_separator();
425
426 // Get the lengths.
427 int i;
428 for (i = 0; i < _scp_nitems; ++i) {
429 if (_items[i] != NULL) {
430 lengths[i] = strlen(_items[i]);
431 // Include space for the separator char (or a NULL for the last item).
432 total_len += lengths[i] + 1;
433 }
434 }
435 assert(total_len > 0, "empty sysclasspath not allowed");
436
437 // Copy the _items to a single string.
438 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
439 char* cp_tmp = cp;
440 for (i = 0; i < _scp_nitems; ++i) {
441 if (_items[i] != NULL) {
442 memcpy(cp_tmp, _items[i], lengths[i]);
443 cp_tmp += lengths[i];
444 *cp_tmp++ = separator;
445 }
446 }
447 *--cp_tmp = '\0'; // Replace the extra separator.
448 return cp;
449 }
450
451 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
452 char*
453 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
454 char *cp;
455
456 assert(str != NULL, "just checking");
457 if (path == NULL) {
458 size_t len = strlen(str) + 1;
459 cp = NEW_C_HEAP_ARRAY(char, len);
460 memcpy(cp, str, len); // copy the trailing null
461 } else {
462 const char separator = *os::path_separator();
463 size_t old_len = strlen(path);
464 size_t str_len = strlen(str);
465 size_t len = old_len + str_len + 2;
466
467 if (prepend) {
468 cp = NEW_C_HEAP_ARRAY(char, len);
469 char* cp_tmp = cp;
470 memcpy(cp_tmp, str, str_len);
471 cp_tmp += str_len;
472 *cp_tmp = separator;
473 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
474 FREE_C_HEAP_ARRAY(char, path);
475 } else {
476 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
477 char* cp_tmp = cp + old_len;
478 *cp_tmp = separator;
479 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
480 }
481 }
482 return cp;
483 }
484
485 // Scan the directory and append any jar or zip files found to path.
486 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
487 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
488 DIR* dir = os::opendir(directory);
489 if (dir == NULL) return path;
490
491 char dir_sep[2] = { '\0', '\0' };
492 size_t directory_len = strlen(directory);
493 const char fileSep = *os::file_separator();
494 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
495
496 /* Scan the directory for jars/zips, appending them to path. */
497 struct dirent *entry;
498 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
499 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
500 const char* name = entry->d_name;
501 const char* ext = name + strlen(name) - 4;
502 bool isJarOrZip = ext > name &&
503 (os::file_name_strcmp(ext, ".jar") == 0 ||
504 os::file_name_strcmp(ext, ".zip") == 0);
505 if (isJarOrZip) {
506 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
507 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
508 path = add_to_path(path, jarpath, false);
509 FREE_C_HEAP_ARRAY(char, jarpath);
510 }
511 }
512 FREE_C_HEAP_ARRAY(char, dbuf);
513 os::closedir(dir);
514 return path;
515 }
516
517 // Parses a memory size specification string.
518 static bool atomull(const char *s, julong* result) {
519 julong n = 0;
520 int args_read = sscanf(s, os::julong_format_specifier(), &n);
521 if (args_read != 1) {
522 return false;
523 }
524 while (*s != '\0' && isdigit(*s)) {
525 s++;
526 }
527 // 4705540: illegal if more characters are found after the first non-digit
528 if (strlen(s) > 1) {
529 return false;
530 }
531 switch (*s) {
532 case 'T': case 't':
533 *result = n * G * K;
534 // Check for overflow.
535 if (*result/((julong)G * K) != n) return false;
536 return true;
537 case 'G': case 'g':
538 *result = n * G;
539 if (*result/G != n) return false;
540 return true;
541 case 'M': case 'm':
542 *result = n * M;
543 if (*result/M != n) return false;
544 return true;
545 case 'K': case 'k':
546 *result = n * K;
547 if (*result/K != n) return false;
548 return true;
549 case '\0':
550 *result = n;
551 return true;
552 default:
553 return false;
554 }
555 }
556
557 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
558 if (size < min_size) return arg_too_small;
559 // Check that size will fit in a size_t (only relevant on 32-bit)
560 if (size > max_uintx) return arg_too_big;
561 return arg_in_range;
562 }
563
564 // Describe an argument out of range error
565 void Arguments::describe_range_error(ArgsRange errcode) {
566 switch(errcode) {
567 case arg_too_big:
568 jio_fprintf(defaultStream::error_stream(),
569 "The specified size exceeds the maximum "
570 "representable size.\n");
571 break;
572 case arg_too_small:
573 case arg_unreadable:
574 case arg_in_range:
575 // do nothing for now
576 break;
577 default:
578 ShouldNotReachHere();
579 }
580 }
581
582 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
583 return CommandLineFlags::boolAtPut(name, &value, origin);
584 }
585
586 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
587 double v;
588 if (sscanf(value, "%lf", &v) != 1) {
589 return false;
590 }
591
592 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
593 return true;
594 }
595 return false;
596 }
597
598 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
599 julong v;
600 intx intx_v;
601 bool is_neg = false;
602 // Check the sign first since atomull() parses only unsigned values.
603 if (*value == '-') {
604 if (!CommandLineFlags::intxAt(name, &intx_v)) {
605 return false;
606 }
607 value++;
608 is_neg = true;
609 }
610 if (!atomull(value, &v)) {
611 return false;
612 }
613 intx_v = (intx) v;
614 if (is_neg) {
615 intx_v = -intx_v;
616 }
617 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
618 return true;
619 }
620 uintx uintx_v = (uintx) v;
621 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
622 return true;
623 }
624 uint64_t uint64_t_v = (uint64_t) v;
625 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
626 return true;
627 }
628 return false;
629 }
630
631 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
632 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
633 // Contract: CommandLineFlags always returns a pointer that needs freeing.
634 FREE_C_HEAP_ARRAY(char, value);
635 return true;
636 }
637
638 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
639 const char* old_value = "";
640 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
641 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
642 size_t new_len = strlen(new_value);
643 const char* value;
644 char* free_this_too = NULL;
645 if (old_len == 0) {
646 value = new_value;
647 } else if (new_len == 0) {
648 value = old_value;
649 } else {
650 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
651 // each new setting adds another LINE to the switch:
652 sprintf(buf, "%s\n%s", old_value, new_value);
653 value = buf;
654 free_this_too = buf;
655 }
656 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
657 // CommandLineFlags always returns a pointer that needs freeing.
658 FREE_C_HEAP_ARRAY(char, value);
659 if (free_this_too != NULL) {
660 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
661 FREE_C_HEAP_ARRAY(char, free_this_too);
662 }
663 return true;
664 }
665
666 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
667
668 // range of acceptable characters spelled out for portability reasons
669 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
670 #define BUFLEN 255
671 char name[BUFLEN+1];
672 char dummy;
673
674 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
675 return set_bool_flag(name, false, origin);
676 }
677 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
678 return set_bool_flag(name, true, origin);
679 }
680
681 char punct;
682 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
683 const char* value = strchr(arg, '=') + 1;
684 Flag* flag = Flag::find_flag(name, strlen(name));
685 if (flag != NULL && flag->is_ccstr()) {
686 if (flag->ccstr_accumulates()) {
687 return append_to_string_flag(name, value, origin);
688 } else {
689 if (value[0] == '\0') {
690 value = NULL;
691 }
692 return set_string_flag(name, value, origin);
693 }
694 }
695 }
696
697 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
698 const char* value = strchr(arg, '=') + 1;
699 // -XX:Foo:=xxx will reset the string flag to the given value.
700 if (value[0] == '\0') {
701 value = NULL;
702 }
703 return set_string_flag(name, value, origin);
704 }
705
706 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
707 #define SIGNED_NUMBER_RANGE "[-0123456789]"
708 #define NUMBER_RANGE "[0123456789]"
709 char value[BUFLEN + 1];
710 char value2[BUFLEN + 1];
711 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
712 // Looks like a floating-point number -- try again with more lenient format string
713 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
714 return set_fp_numeric_flag(name, value, origin);
715 }
716 }
717
718 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
719 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
720 return set_numeric_flag(name, value, origin);
721 }
722
723 return false;
724 }
725
726 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
727 assert(bldarray != NULL, "illegal argument");
728
729 if (arg == NULL) {
730 return;
731 }
732
733 int index = *count;
734
735 // expand the array and add arg to the last element
736 (*count)++;
737 if (*bldarray == NULL) {
738 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
739 } else {
740 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
741 }
742 (*bldarray)[index] = strdup(arg);
743 }
744
745 void Arguments::build_jvm_args(const char* arg) {
746 add_string(&_jvm_args_array, &_num_jvm_args, arg);
747 }
748
749 void Arguments::build_jvm_flags(const char* arg) {
750 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
751 }
752
753 // utility function to return a string that concatenates all
754 // strings in a given char** array
755 const char* Arguments::build_resource_string(char** args, int count) {
756 if (args == NULL || count == 0) {
757 return NULL;
758 }
759 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
760 for (int i = 1; i < count; i++) {
761 length += strlen(args[i]) + 1; // add 1 for a space
762 }
763 char* s = NEW_RESOURCE_ARRAY(char, length);
764 strcpy(s, args[0]);
765 for (int j = 1; j < count; j++) {
766 strcat(s, " ");
767 strcat(s, args[j]);
768 }
769 return (const char*) s;
770 }
771
772 void Arguments::print_on(outputStream* st) {
773 st->print_cr("VM Arguments:");
774 if (num_jvm_flags() > 0) {
775 st->print("jvm_flags: "); print_jvm_flags_on(st);
776 }
777 if (num_jvm_args() > 0) {
778 st->print("jvm_args: "); print_jvm_args_on(st);
779 }
780 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
781 st->print_cr("Launcher Type: %s", _sun_java_launcher);
782 }
783
784 void Arguments::print_jvm_flags_on(outputStream* st) {
785 if (_num_jvm_flags > 0) {
786 for (int i=0; i < _num_jvm_flags; i++) {
787 st->print("%s ", _jvm_flags_array[i]);
788 }
789 st->print_cr("");
790 }
791 }
792
793 void Arguments::print_jvm_args_on(outputStream* st) {
794 if (_num_jvm_args > 0) {
795 for (int i=0; i < _num_jvm_args; i++) {
796 st->print("%s ", _jvm_args_array[i]);
797 }
798 st->print_cr("");
799 }
800 }
801
802 bool Arguments::process_argument(const char* arg,
803 jboolean ignore_unrecognized, FlagValueOrigin origin) {
804
805 JDK_Version since = JDK_Version();
806
807 if (parse_argument(arg, origin) || ignore_unrecognized) {
808 return true;
809 }
810
811 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg;
812 if (is_newly_obsolete(arg, &since)) {
813 char version[256];
814 since.to_string(version, sizeof(version));
815 warning("ignoring option %s; support was removed in %s", argname, version);
816 return true;
817 }
818
819 // For locked flags, report a custom error message if available.
820 // Otherwise, report the standard unrecognized VM option.
821
822 Flag* locked_flag = Flag::find_flag((char*)argname, strlen(argname), true);
823 if (locked_flag != NULL) {
824 char locked_message_buf[BUFLEN];
825 locked_flag->get_locked_message(locked_message_buf, BUFLEN);
826 if (strlen(locked_message_buf) == 0) {
827 jio_fprintf(defaultStream::error_stream(),
828 "Unrecognized VM option '%s'\n", argname);
829 } else {
830 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
831 }
832 }
833
834 // allow for commandline "commenting out" options like -XX:#+Verbose
835 return arg[0] == '#';
836 }
837
838 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
839 FILE* stream = fopen(file_name, "rb");
840 if (stream == NULL) {
841 if (should_exist) {
842 jio_fprintf(defaultStream::error_stream(),
843 "Could not open settings file %s\n", file_name);
844 return false;
845 } else {
846 return true;
847 }
848 }
849
850 char token[1024];
851 int pos = 0;
852
853 bool in_white_space = true;
854 bool in_comment = false;
855 bool in_quote = false;
856 char quote_c = 0;
857 bool result = true;
858
859 int c = getc(stream);
860 while(c != EOF) {
861 if (in_white_space) {
862 if (in_comment) {
863 if (c == '\n') in_comment = false;
864 } else {
865 if (c == '#') in_comment = true;
866 else if (!isspace(c)) {
867 in_white_space = false;
868 token[pos++] = c;
869 }
870 }
871 } else {
872 if (c == '\n' || (!in_quote && isspace(c))) {
873 // token ends at newline, or at unquoted whitespace
874 // this allows a way to include spaces in string-valued options
875 token[pos] = '\0';
876 logOption(token);
877 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
878 build_jvm_flags(token);
879 pos = 0;
880 in_white_space = true;
881 in_quote = false;
882 } else if (!in_quote && (c == '\'' || c == '"')) {
883 in_quote = true;
884 quote_c = c;
885 } else if (in_quote && (c == quote_c)) {
886 in_quote = false;
887 } else {
888 token[pos++] = c;
889 }
890 }
891 c = getc(stream);
892 }
893 if (pos > 0) {
894 token[pos] = '\0';
895 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
896 build_jvm_flags(token);
897 }
898 fclose(stream);
899 return result;
900 }
901
902 //=============================================================================================================
903 // Parsing of properties (-D)
904
905 const char* Arguments::get_property(const char* key) {
906 return PropertyList_get_value(system_properties(), key);
907 }
908
909 bool Arguments::add_property(const char* prop) {
910 const char* eq = strchr(prop, '=');
911 char* key;
912 // ns must be static--its address may be stored in a SystemProperty object.
913 const static char ns[1] = {0};
914 char* value = (char *)ns;
915
916 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
917 key = AllocateHeap(key_len + 1, "add_property");
918 strncpy(key, prop, key_len);
919 key[key_len] = '\0';
920
921 if (eq != NULL) {
922 size_t value_len = strlen(prop) - key_len - 1;
923 value = AllocateHeap(value_len + 1, "add_property");
924 strncpy(value, &prop[key_len + 1], value_len + 1);
925 }
926
927 if (strcmp(key, "java.compiler") == 0) {
928 process_java_compiler_argument(value);
929 FreeHeap(key);
930 if (eq != NULL) {
931 FreeHeap(value);
932 }
933 return true;
934 } else if (strcmp(key, "sun.java.command") == 0) {
935 _java_command = value;
936
937 // Record value in Arguments, but let it get passed to Java.
938 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
939 // launcher.pid property is private and is processed
940 // in process_sun_java_launcher_properties();
941 // the sun.java.launcher property is passed on to the java application
942 FreeHeap(key);
943 if (eq != NULL) {
944 FreeHeap(value);
945 }
946 return true;
947 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
948 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
949 // its value without going through the property list or making a Java call.
950 _java_vendor_url_bug = value;
951 } else if (strcmp(key, "sun.boot.library.path") == 0) {
952 PropertyList_unique_add(&_system_properties, key, value, true);
953 return true;
954 }
955 // Create new property and add at the end of the list
956 PropertyList_unique_add(&_system_properties, key, value);
957 return true;
958 }
959
960 //===========================================================================================================
961 // Setting int/mixed/comp mode flags
962
963 void Arguments::set_mode_flags(Mode mode) {
964 // Set up default values for all flags.
965 // If you add a flag to any of the branches below,
966 // add a default value for it here.
967 set_java_compiler(false);
968 _mode = mode;
969
970 // Ensure Agent_OnLoad has the correct initial values.
971 // This may not be the final mode; mode may change later in onload phase.
972 PropertyList_unique_add(&_system_properties, "java.vm.info",
973 (char*)VM_Version::vm_info_string(), false);
974
975 UseInterpreter = true;
976 UseCompiler = true;
977 UseLoopCounter = true;
978
979 #ifndef ZERO
980 // Turn these off for mixed and comp. Leave them on for Zero.
981 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
982 UseFastAccessorMethods = (mode == _int);
983 }
984 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
985 UseFastEmptyMethods = (mode == _int);
986 }
987 #endif
988
989 // Default values may be platform/compiler dependent -
990 // use the saved values
991 ClipInlining = Arguments::_ClipInlining;
992 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
993 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
994 BackgroundCompilation = Arguments::_BackgroundCompilation;
995
996 // Change from defaults based on mode
997 switch (mode) {
998 default:
999 ShouldNotReachHere();
1000 break;
1001 case _int:
1002 UseCompiler = false;
1003 UseLoopCounter = false;
1004 AlwaysCompileLoopMethods = false;
1005 UseOnStackReplacement = false;
1006 break;
1007 case _mixed:
1008 // same as default
1009 break;
1010 case _comp:
1011 UseInterpreter = false;
1012 BackgroundCompilation = false;
1013 ClipInlining = false;
1014 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1015 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1016 // compile a level 4 (C2) and then continue executing it.
1017 if (TieredCompilation) {
1018 Tier3InvokeNotifyFreqLog = 0;
1019 Tier4InvocationThreshold = 0;
1020 }
1021 break;
1022 }
1023 }
1024
1025 // Conflict: required to use shared spaces (-Xshare:on), but
1026 // incompatible command line options were chosen.
1027
1028 static void no_shared_spaces() {
1029 if (RequireSharedSpaces) {
1030 jio_fprintf(defaultStream::error_stream(),
1031 "Class data sharing is inconsistent with other specified options.\n");
1032 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1033 } else {
1034 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1035 }
1036 }
1037
1038 void Arguments::set_tiered_flags() {
1039 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1040 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1041 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1042 }
1043 if (CompilationPolicyChoice < 2) {
1044 vm_exit_during_initialization(
1045 "Incompatible compilation policy selected", NULL);
1046 }
1047 // Increase the code cache size - tiered compiles a lot more.
1048 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1049 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1050 }
1051 }
1052
1053 #ifndef KERNEL
1054 static void disable_adaptive_size_policy(const char* collector_name) {
1055 if (UseAdaptiveSizePolicy) {
1056 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1057 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1058 collector_name);
1059 }
1060 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1061 }
1062 }
1063
1064 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1065 // if it's not explictly set or unset. If the user has chosen
1066 // UseParNewGC and not explicitly set ParallelGCThreads we
1067 // set it, unless this is a single cpu machine.
1068 void Arguments::set_parnew_gc_flags() {
1069 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1070 "control point invariant");
1071 assert(UseParNewGC, "Error");
1072
1073 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1074 disable_adaptive_size_policy("UseParNewGC");
1075
1076 if (ParallelGCThreads == 0) {
1077 FLAG_SET_DEFAULT(ParallelGCThreads,
1078 Abstract_VM_Version::parallel_worker_threads());
1079 if (ParallelGCThreads == 1) {
1080 FLAG_SET_DEFAULT(UseParNewGC, false);
1081 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1082 }
1083 }
1084 if (UseParNewGC) {
1085 // CDS doesn't work with ParNew yet
1086 no_shared_spaces();
1087
1088 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1089 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1090 // we set them to 1024 and 1024.
1091 // See CR 6362902.
1092 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1093 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1094 }
1095 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1096 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1097 }
1098
1099 // AlwaysTenure flag should make ParNew promote all at first collection.
1100 // See CR 6362902.
1101 if (AlwaysTenure) {
1102 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
1103 }
1104 // When using compressed oops, we use local overflow stacks,
1105 // rather than using a global overflow list chained through
1106 // the klass word of the object's pre-image.
1107 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1108 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1109 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1110 }
1111 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1112 }
1113 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1114 }
1115 }
1116
1117 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1118 // sparc/solaris for certain applications, but would gain from
1119 // further optimization and tuning efforts, and would almost
1120 // certainly gain from analysis of platform and environment.
1121 void Arguments::set_cms_and_parnew_gc_flags() {
1122 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1123 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1124
1125 // If we are using CMS, we prefer to UseParNewGC,
1126 // unless explicitly forbidden.
1127 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1128 FLAG_SET_ERGO(bool, UseParNewGC, true);
1129 }
1130
1131 // Turn off AdaptiveSizePolicy for CMS until it is complete.
1132 disable_adaptive_size_policy("UseConcMarkSweepGC");
1133
1134 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1135 // as needed.
1136 if (UseParNewGC) {
1137 set_parnew_gc_flags();
1138 }
1139
1140 // MaxHeapSize is aligned down in collectorPolicy
1141 size_t max_heap = align_size_down(MaxHeapSize,
1142 CardTableRS::ct_max_alignment_constraint());
1143
1144 // Now make adjustments for CMS
1145 intx tenuring_default = (intx)6;
1146 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1147
1148 // Preferred young gen size for "short" pauses:
1149 // upper bound depends on # of threads and NewRatio.
1150 const uintx parallel_gc_threads =
1151 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1152 const size_t preferred_max_new_size_unaligned =
1153 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1154 size_t preferred_max_new_size =
1155 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1156
1157 // Unless explicitly requested otherwise, size young gen
1158 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1159
1160 // If either MaxNewSize or NewRatio is set on the command line,
1161 // assume the user is trying to set the size of the young gen.
1162 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1163
1164 // Set MaxNewSize to our calculated preferred_max_new_size unless
1165 // NewSize was set on the command line and it is larger than
1166 // preferred_max_new_size.
1167 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1168 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1169 } else {
1170 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1171 }
1172 if (PrintGCDetails && Verbose) {
1173 // Too early to use gclog_or_tty
1174 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1175 }
1176
1177 // Code along this path potentially sets NewSize and OldSize
1178
1179 assert(max_heap >= InitialHeapSize, "Error");
1180 assert(max_heap >= NewSize, "Error");
1181
1182 if (PrintGCDetails && Verbose) {
1183 // Too early to use gclog_or_tty
1184 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1185 " initial_heap_size: " SIZE_FORMAT
1186 " max_heap: " SIZE_FORMAT,
1187 min_heap_size(), InitialHeapSize, max_heap);
1188 }
1189 size_t min_new = preferred_max_new_size;
1190 if (FLAG_IS_CMDLINE(NewSize)) {
1191 min_new = NewSize;
1192 }
1193 if (max_heap > min_new && min_heap_size() > min_new) {
1194 // Unless explicitly requested otherwise, make young gen
1195 // at least min_new, and at most preferred_max_new_size.
1196 if (FLAG_IS_DEFAULT(NewSize)) {
1197 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1198 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1199 if (PrintGCDetails && Verbose) {
1200 // Too early to use gclog_or_tty
1201 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1202 }
1203 }
1204 // Unless explicitly requested otherwise, size old gen
1205 // so it's NewRatio x of NewSize.
1206 if (FLAG_IS_DEFAULT(OldSize)) {
1207 if (max_heap > NewSize) {
1208 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1209 if (PrintGCDetails && Verbose) {
1210 // Too early to use gclog_or_tty
1211 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1212 }
1213 }
1214 }
1215 }
1216 }
1217 // Unless explicitly requested otherwise, definitely
1218 // promote all objects surviving "tenuring_default" scavenges.
1219 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1220 FLAG_IS_DEFAULT(SurvivorRatio)) {
1221 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1222 }
1223 // If we decided above (or user explicitly requested)
1224 // `promote all' (via MaxTenuringThreshold := 0),
1225 // prefer minuscule survivor spaces so as not to waste
1226 // space for (non-existent) survivors
1227 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1228 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1229 }
1230 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1231 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1232 // This is done in order to make ParNew+CMS configuration to work
1233 // with YoungPLABSize and OldPLABSize options.
1234 // See CR 6362902.
1235 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1236 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1237 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1238 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1239 // the value (either from the command line or ergonomics) of
1240 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1241 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1242 } else {
1243 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1244 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1245 // we'll let it to take precedence.
1246 jio_fprintf(defaultStream::error_stream(),
1247 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1248 " options are specified for the CMS collector."
1249 " CMSParPromoteBlocksToClaim will take precedence.\n");
1250 }
1251 }
1252 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1253 // OldPLAB sizing manually turned off: Use a larger default setting,
1254 // unless it was manually specified. This is because a too-low value
1255 // will slow down scavenges.
1256 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1257 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1258 }
1259 }
1260 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1261 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1262 // If either of the static initialization defaults have changed, note this
1263 // modification.
1264 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1265 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1266 }
1267 if (PrintGCDetails && Verbose) {
1268 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1269 MarkStackSize / K, MarkStackSizeMax / K);
1270 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1271 }
1272 }
1273 #endif // KERNEL
1274
1275 void set_object_alignment() {
1276 // Object alignment.
1277 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1278 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1279 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1280 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1281 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1282 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1283
1284 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1285 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1286
1287 // Oop encoding heap max
1288 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1289
1290 #ifndef KERNEL
1291 // Set CMS global values
1292 CompactibleFreeListSpace::set_cms_values();
1293 #endif // KERNEL
1294 }
1295
1296 bool verify_object_alignment() {
1297 // Object alignment.
1298 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1299 jio_fprintf(defaultStream::error_stream(),
1300 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1301 (int)ObjectAlignmentInBytes);
1302 return false;
1303 }
1304 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1305 jio_fprintf(defaultStream::error_stream(),
1306 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1307 (int)ObjectAlignmentInBytes, BytesPerLong);
1308 return false;
1309 }
1310 // It does not make sense to have big object alignment
1311 // since a space lost due to alignment will be greater
1312 // then a saved space from compressed oops.
1313 if ((int)ObjectAlignmentInBytes > 256) {
1314 jio_fprintf(defaultStream::error_stream(),
1315 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1316 (int)ObjectAlignmentInBytes);
1317 return false;
1318 }
1319 // In case page size is very small.
1320 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1321 jio_fprintf(defaultStream::error_stream(),
1322 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1323 (int)ObjectAlignmentInBytes, os::vm_page_size());
1324 return false;
1325 }
1326 return true;
1327 }
1328
1329 inline uintx max_heap_for_compressed_oops() {
1330 // Avoid sign flip.
1331 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) {
1332 return 0;
1333 }
1334 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1335 NOT_LP64(ShouldNotReachHere(); return 0);
1336 }
1337
1338 bool Arguments::should_auto_select_low_pause_collector() {
1339 if (UseAutoGCSelectPolicy &&
1340 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1341 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1342 if (PrintGCDetails) {
1343 // Cannot use gclog_or_tty yet.
1344 tty->print_cr("Automatic selection of the low pause collector"
1345 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1346 }
1347 return true;
1348 }
1349 return false;
1350 }
1351
1352 void Arguments::set_ergonomics_flags() {
1353 // Parallel GC is not compatible with sharing. If one specifies
1354 // that they want sharing explicitly, do not set ergonomics flags.
1355 if (DumpSharedSpaces || RequireSharedSpaces) {
1356 return;
1357 }
1358
1359 if (os::is_server_class_machine()) {
1360 // If no other collector is requested explicitly,
1361 // let the VM select the collector based on
1362 // machine class and automatic selection policy.
1363 if (!UseSerialGC &&
1364 !UseConcMarkSweepGC &&
1365 !UseG1GC &&
1366 !UseParNewGC &&
1367 !DumpSharedSpaces &&
1368 FLAG_IS_DEFAULT(UseParallelGC)) {
1369 if (should_auto_select_low_pause_collector()) {
1370 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1371 } else {
1372 FLAG_SET_ERGO(bool, UseParallelGC, true);
1373 }
1374 no_shared_spaces();
1375 }
1376 }
1377
1378 #ifndef ZERO
1379 #ifdef _LP64
1380 // Check that UseCompressedOops can be set with the max heap size allocated
1381 // by ergonomics.
1382 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1383 #if !defined(COMPILER1) || defined(TIERED)
1384 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1385 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1386 }
1387 #endif
1388 #ifdef _WIN64
1389 if (UseLargePages && UseCompressedOops) {
1390 // Cannot allocate guard pages for implicit checks in indexed addressing
1391 // mode, when large pages are specified on windows.
1392 // This flag could be switched ON if narrow oop base address is set to 0,
1393 // see code in Universe::initialize_heap().
1394 Universe::set_narrow_oop_use_implicit_null_checks(false);
1395 }
1396 #endif // _WIN64
1397 } else {
1398 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1399 warning("Max heap size too large for Compressed Oops");
1400 FLAG_SET_DEFAULT(UseCompressedOops, false);
1401 }
1402 }
1403 // Also checks that certain machines are slower with compressed oops
1404 // in vm_version initialization code.
1405 #endif // _LP64
1406 #endif // !ZERO
1407 }
1408
1409 void Arguments::set_parallel_gc_flags() {
1410 assert(UseParallelGC || UseParallelOldGC, "Error");
1411 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1412 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1413 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1414 }
1415 FLAG_SET_DEFAULT(UseParallelGC, true);
1416
1417 // If no heap maximum was requested explicitly, use some reasonable fraction
1418 // of the physical memory, up to a maximum of 1GB.
1419 if (UseParallelGC) {
1420 FLAG_SET_DEFAULT(ParallelGCThreads,
1421 Abstract_VM_Version::parallel_worker_threads());
1422
1423 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1424 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1425 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1426 // See CR 6362902 for details.
1427 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1428 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1429 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1430 }
1431 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1432 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1433 }
1434 }
1435
1436 if (UseParallelOldGC) {
1437 // Par compact uses lower default values since they are treated as
1438 // minimums. These are different defaults because of the different
1439 // interpretation and are not ergonomically set.
1440 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1441 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1442 }
1443 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1444 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1445 }
1446 }
1447 }
1448 if (UseNUMA) {
1449 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
1450 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
1451 }
1452 // For those collectors or operating systems (eg, Windows) that do
1453 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
1454 UseNUMAInterleaving = true;
1455 }
1456 }
1457
1458 void Arguments::set_g1_gc_flags() {
1459 assert(UseG1GC, "Error");
1460 #ifdef COMPILER1
1461 FastTLABRefill = false;
1462 #endif
1463 FLAG_SET_DEFAULT(ParallelGCThreads,
1464 Abstract_VM_Version::parallel_worker_threads());
1465 if (ParallelGCThreads == 0) {
1466 FLAG_SET_DEFAULT(ParallelGCThreads,
1467 Abstract_VM_Version::parallel_worker_threads());
1468 }
1469 no_shared_spaces();
1470
1471 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1472 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1473 }
1474 if (PrintGCDetails && Verbose) {
1475 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1476 MarkStackSize / K, MarkStackSizeMax / K);
1477 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1478 }
1479
1480 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1481 // In G1, we want the default GC overhead goal to be higher than
1482 // say in PS. So we set it here to 10%. Otherwise the heap might
1483 // be expanded more aggressively than we would like it to. In
1484 // fact, even 10% seems to not be high enough in some cases
1485 // (especially small GC stress tests that the main thing they do
1486 // is allocation). We might consider increase it further.
1487 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1488 }
1489 }
1490
1491 void Arguments::set_heap_size() {
1492 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1493 // Deprecated flag
1494 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1495 }
1496
1497 const julong phys_mem =
1498 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1499 : (julong)MaxRAM;
1500
1501 // If the maximum heap size has not been set with -Xmx,
1502 // then set it as fraction of the size of physical memory,
1503 // respecting the maximum and minimum sizes of the heap.
1504 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1505 julong reasonable_max = phys_mem / MaxRAMFraction;
1506
1507 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1508 // Small physical memory, so use a minimum fraction of it for the heap
1509 reasonable_max = phys_mem / MinRAMFraction;
1510 } else {
1511 // Not-small physical memory, so require a heap at least
1512 // as large as MaxHeapSize
1513 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1514 }
1515 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1516 // Limit the heap size to ErgoHeapSizeLimit
1517 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1518 }
1519 if (UseCompressedOops) {
1520 // Limit the heap size to the maximum possible when using compressed oops
1521 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1522 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1523 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1524 // but it should be not less than default MaxHeapSize.
1525 max_coop_heap -= HeapBaseMinAddress;
1526 }
1527 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1528 }
1529 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1530
1531 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1532 // An initial heap size was specified on the command line,
1533 // so be sure that the maximum size is consistent. Done
1534 // after call to allocatable_physical_memory because that
1535 // method might reduce the allocation size.
1536 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1537 }
1538
1539 if (PrintGCDetails && Verbose) {
1540 // Cannot use gclog_or_tty yet.
1541 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1542 }
1543 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1544 }
1545
1546 // If the initial_heap_size has not been set with InitialHeapSize
1547 // or -Xms, then set it as fraction of the size of physical memory,
1548 // respecting the maximum and minimum sizes of the heap.
1549 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1550 julong reasonable_minimum = (julong)(OldSize + NewSize);
1551
1552 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1553
1554 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1555
1556 julong reasonable_initial = phys_mem / InitialRAMFraction;
1557
1558 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1559 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1560
1561 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1562
1563 if (PrintGCDetails && Verbose) {
1564 // Cannot use gclog_or_tty yet.
1565 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1566 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1567 }
1568 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1569 set_min_heap_size((uintx)reasonable_minimum);
1570 }
1571 }
1572
1573 // This must be called after ergonomics because we want bytecode rewriting
1574 // if the server compiler is used, or if UseSharedSpaces is disabled.
1575 void Arguments::set_bytecode_flags() {
1576 // Better not attempt to store into a read-only space.
1577 if (UseSharedSpaces) {
1578 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1579 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1580 }
1581
1582 if (!RewriteBytecodes) {
1583 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1584 }
1585 }
1586
1587 // Aggressive optimization flags -XX:+AggressiveOpts
1588 void Arguments::set_aggressive_opts_flags() {
1589 #ifdef COMPILER2
1590 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1591 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1592 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1593 }
1594 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1595 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1596 }
1597
1598 // Feed the cache size setting into the JDK
1599 char buffer[1024];
1600 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1601 add_property(buffer);
1602 }
1603 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1604 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1605 }
1606 #endif
1607
1608 if (AggressiveOpts) {
1609 // Sample flag setting code
1610 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1611 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1612 // }
1613 }
1614 }
1615
1616 //===========================================================================================================
1617 // Parsing of java.compiler property
1618
1619 void Arguments::process_java_compiler_argument(char* arg) {
1620 // For backwards compatibility, Djava.compiler=NONE or ""
1621 // causes us to switch to -Xint mode UNLESS -Xdebug
1622 // is also specified.
1623 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1624 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1625 }
1626 }
1627
1628 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1629 _sun_java_launcher = strdup(launcher);
1630 if (strcmp("gamma", _sun_java_launcher) == 0) {
1631 _created_by_gamma_launcher = true;
1632 }
1633 }
1634
1635 bool Arguments::created_by_java_launcher() {
1636 assert(_sun_java_launcher != NULL, "property must have value");
1637 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1638 }
1639
1640 bool Arguments::created_by_gamma_launcher() {
1641 return _created_by_gamma_launcher;
1642 }
1643
1644 //===========================================================================================================
1645 // Parsing of main arguments
1646
1647 bool Arguments::verify_interval(uintx val, uintx min,
1648 uintx max, const char* name) {
1649 // Returns true iff value is in the inclusive interval [min..max]
1650 // false, otherwise.
1651 if (val >= min && val <= max) {
1652 return true;
1653 }
1654 jio_fprintf(defaultStream::error_stream(),
1655 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1656 " and " UINTX_FORMAT "\n",
1657 name, val, min, max);
1658 return false;
1659 }
1660
1661 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1662 // Returns true if given value is at least specified min threshold
1663 // false, otherwise.
1664 if (val >= min ) {
1665 return true;
1666 }
1667 jio_fprintf(defaultStream::error_stream(),
1668 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1669 name, val, min);
1670 return false;
1671 }
1672
1673 bool Arguments::verify_percentage(uintx value, const char* name) {
1674 if (value <= 100) {
1675 return true;
1676 }
1677 jio_fprintf(defaultStream::error_stream(),
1678 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1679 name, value);
1680 return false;
1681 }
1682
1683 static void force_serial_gc() {
1684 FLAG_SET_DEFAULT(UseSerialGC, true);
1685 FLAG_SET_DEFAULT(UseParNewGC, false);
1686 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1687 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1688 FLAG_SET_DEFAULT(UseParallelGC, false);
1689 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1690 FLAG_SET_DEFAULT(UseG1GC, false);
1691 }
1692
1693 static bool verify_serial_gc_flags() {
1694 return (UseSerialGC &&
1695 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1696 UseParallelGC || UseParallelOldGC));
1697 }
1698
1699 // check if do gclog rotation
1700 // +UseGCLogFileRotation is a must,
1701 // no gc log rotation when log file not supplied or
1702 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1703 void check_gclog_consistency() {
1704 if (UseGCLogFileRotation) {
1705 if ((Arguments::gc_log_filename() == NULL) ||
1706 (NumberOfGCLogFiles == 0) ||
1707 (GCLogFileSize == 0)) {
1708 jio_fprintf(defaultStream::output_stream(),
1709 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1710 "where num_of_file > 0 and num_of_size > 0\n"
1711 "GC log rotation is turned off\n");
1712 UseGCLogFileRotation = false;
1713 }
1714 }
1715
1716 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1717 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1718 jio_fprintf(defaultStream::output_stream(),
1719 "GCLogFileSize changed to minimum 8K\n");
1720 }
1721 }
1722
1723 // Check consistency of GC selection
1724 bool Arguments::check_gc_consistency() {
1725 check_gclog_consistency();
1726 bool status = true;
1727 // Ensure that the user has not selected conflicting sets
1728 // of collectors. [Note: this check is merely a user convenience;
1729 // collectors over-ride each other so that only a non-conflicting
1730 // set is selected; however what the user gets is not what they
1731 // may have expected from the combination they asked for. It's
1732 // better to reduce user confusion by not allowing them to
1733 // select conflicting combinations.
1734 uint i = 0;
1735 if (UseSerialGC) i++;
1736 if (UseConcMarkSweepGC || UseParNewGC) i++;
1737 if (UseParallelGC || UseParallelOldGC) i++;
1738 if (UseG1GC) i++;
1739 if (i > 1) {
1740 jio_fprintf(defaultStream::error_stream(),
1741 "Conflicting collector combinations in option list; "
1742 "please refer to the release notes for the combinations "
1743 "allowed\n");
1744 status = false;
1745 }
1746
1747 return status;
1748 }
1749
1750 // Check stack pages settings
1751 bool Arguments::check_stack_pages()
1752 {
1753 bool status = true;
1754 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1755 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1756 // greater stack shadow pages can't generate instruction to bang stack
1757 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1758 return status;
1759 }
1760
1761 // Check the consistency of vm_init_args
1762 bool Arguments::check_vm_args_consistency() {
1763 // Method for adding checks for flag consistency.
1764 // The intent is to warn the user of all possible conflicts,
1765 // before returning an error.
1766 // Note: Needs platform-dependent factoring.
1767 bool status = true;
1768
1769 #if ( (defined(COMPILER2) && defined(SPARC)))
1770 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1771 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1772 // x86. Normally, VM_Version_init must be called from init_globals in
1773 // init.cpp, which is called by the initial java thread *after* arguments
1774 // have been parsed. VM_Version_init gets called twice on sparc.
1775 extern void VM_Version_init();
1776 VM_Version_init();
1777 if (!VM_Version::has_v9()) {
1778 jio_fprintf(defaultStream::error_stream(),
1779 "V8 Machine detected, Server requires V9\n");
1780 status = false;
1781 }
1782 #endif /* COMPILER2 && SPARC */
1783
1784 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1785 // builds so the cost of stack banging can be measured.
1786 #if (defined(PRODUCT) && defined(SOLARIS))
1787 if (!UseBoundThreads && !UseStackBanging) {
1788 jio_fprintf(defaultStream::error_stream(),
1789 "-UseStackBanging conflicts with -UseBoundThreads\n");
1790
1791 status = false;
1792 }
1793 #endif
1794
1795 if (TLABRefillWasteFraction == 0) {
1796 jio_fprintf(defaultStream::error_stream(),
1797 "TLABRefillWasteFraction should be a denominator, "
1798 "not " SIZE_FORMAT "\n",
1799 TLABRefillWasteFraction);
1800 status = false;
1801 }
1802
1803 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1804 "AdaptiveSizePolicyWeight");
1805 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1806 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1807 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1808 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1809
1810 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1811 jio_fprintf(defaultStream::error_stream(),
1812 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1813 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1814 MinHeapFreeRatio, MaxHeapFreeRatio);
1815 status = false;
1816 }
1817 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1818 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1819
1820 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1821 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1822 }
1823
1824 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1825 // Settings to encourage splitting.
1826 if (!FLAG_IS_CMDLINE(NewRatio)) {
1827 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1828 }
1829 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1830 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1831 }
1832 }
1833
1834 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1835 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1836 if (GCTimeLimit == 100) {
1837 // Turn off gc-overhead-limit-exceeded checks
1838 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1839 }
1840
1841 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1842
1843 status = status && check_gc_consistency();
1844 status = status && check_stack_pages();
1845
1846 if (_has_alloc_profile) {
1847 if (UseParallelGC || UseParallelOldGC) {
1848 jio_fprintf(defaultStream::error_stream(),
1849 "error: invalid argument combination.\n"
1850 "Allocation profiling (-Xaprof) cannot be used together with "
1851 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1852 status = false;
1853 }
1854 if (UseConcMarkSweepGC) {
1855 jio_fprintf(defaultStream::error_stream(),
1856 "error: invalid argument combination.\n"
1857 "Allocation profiling (-Xaprof) cannot be used together with "
1858 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1859 status = false;
1860 }
1861 }
1862
1863 if (CMSIncrementalMode) {
1864 if (!UseConcMarkSweepGC) {
1865 jio_fprintf(defaultStream::error_stream(),
1866 "error: invalid argument combination.\n"
1867 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1868 "selected in order\nto use CMSIncrementalMode.\n");
1869 status = false;
1870 } else {
1871 status = status && verify_percentage(CMSIncrementalDutyCycle,
1872 "CMSIncrementalDutyCycle");
1873 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1874 "CMSIncrementalDutyCycleMin");
1875 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1876 "CMSIncrementalSafetyFactor");
1877 status = status && verify_percentage(CMSIncrementalOffset,
1878 "CMSIncrementalOffset");
1879 status = status && verify_percentage(CMSExpAvgFactor,
1880 "CMSExpAvgFactor");
1881 // If it was not set on the command line, set
1882 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1883 if (CMSInitiatingOccupancyFraction < 0) {
1884 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1885 }
1886 }
1887 }
1888
1889 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1890 // insists that we hold the requisite locks so that the iteration is
1891 // MT-safe. For the verification at start-up and shut-down, we don't
1892 // yet have a good way of acquiring and releasing these locks,
1893 // which are not visible at the CollectedHeap level. We want to
1894 // be able to acquire these locks and then do the iteration rather
1895 // than just disable the lock verification. This will be fixed under
1896 // bug 4788986.
1897 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1898 if (VerifyGCStartAt == 0) {
1899 warning("Heap verification at start-up disabled "
1900 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1901 VerifyGCStartAt = 1; // Disable verification at start-up
1902 }
1903 if (VerifyBeforeExit) {
1904 warning("Heap verification at shutdown disabled "
1905 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1906 VerifyBeforeExit = false; // Disable verification at shutdown
1907 }
1908 }
1909
1910 // Note: only executed in non-PRODUCT mode
1911 if (!UseAsyncConcMarkSweepGC &&
1912 (ExplicitGCInvokesConcurrent ||
1913 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1914 jio_fprintf(defaultStream::error_stream(),
1915 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1916 " with -UseAsyncConcMarkSweepGC");
1917 status = false;
1918 }
1919
1920 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
1921
1922 #ifndef SERIALGC
1923 if (UseG1GC) {
1924 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1925 "InitiatingHeapOccupancyPercent");
1926 status = status && verify_min_value(G1RefProcDrainInterval, 1,
1927 "G1RefProcDrainInterval");
1928 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
1929 "G1ConcMarkStepDurationMillis");
1930 }
1931 #endif
1932
1933 status = status && verify_interval(RefDiscoveryPolicy,
1934 ReferenceProcessor::DiscoveryPolicyMin,
1935 ReferenceProcessor::DiscoveryPolicyMax,
1936 "RefDiscoveryPolicy");
1937
1938 // Limit the lower bound of this flag to 1 as it is used in a division
1939 // expression.
1940 status = status && verify_interval(TLABWasteTargetPercent,
1941 1, 100, "TLABWasteTargetPercent");
1942
1943 status = status && verify_object_alignment();
1944
1945 return status;
1946 }
1947
1948 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1949 const char* option_type) {
1950 if (ignore) return false;
1951
1952 const char* spacer = " ";
1953 if (option_type == NULL) {
1954 option_type = ++spacer; // Set both to the empty string.
1955 }
1956
1957 if (os::obsolete_option(option)) {
1958 jio_fprintf(defaultStream::error_stream(),
1959 "Obsolete %s%soption: %s\n", option_type, spacer,
1960 option->optionString);
1961 return false;
1962 } else {
1963 jio_fprintf(defaultStream::error_stream(),
1964 "Unrecognized %s%soption: %s\n", option_type, spacer,
1965 option->optionString);
1966 return true;
1967 }
1968 }
1969
1970 static const char* user_assertion_options[] = {
1971 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1972 };
1973
1974 static const char* system_assertion_options[] = {
1975 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1976 };
1977
1978 // Return true if any of the strings in null-terminated array 'names' matches.
1979 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1980 // the option must match exactly.
1981 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1982 bool tail_allowed) {
1983 for (/* empty */; *names != NULL; ++names) {
1984 if (match_option(option, *names, tail)) {
1985 if (**tail == '\0' || tail_allowed && **tail == ':') {
1986 return true;
1987 }
1988 }
1989 }
1990 return false;
1991 }
1992
1993 bool Arguments::parse_uintx(const char* value,
1994 uintx* uintx_arg,
1995 uintx min_size) {
1996
1997 // Check the sign first since atomull() parses only unsigned values.
1998 bool value_is_positive = !(*value == '-');
1999
2000 if (value_is_positive) {
2001 julong n;
2002 bool good_return = atomull(value, &n);
2003 if (good_return) {
2004 bool above_minimum = n >= min_size;
2005 bool value_is_too_large = n > max_uintx;
2006
2007 if (above_minimum && !value_is_too_large) {
2008 *uintx_arg = n;
2009 return true;
2010 }
2011 }
2012 }
2013 return false;
2014 }
2015
2016 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2017 julong* long_arg,
2018 julong min_size) {
2019 if (!atomull(s, long_arg)) return arg_unreadable;
2020 return check_memory_size(*long_arg, min_size);
2021 }
2022
2023 // Parse JavaVMInitArgs structure
2024
2025 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2026 // For components of the system classpath.
2027 SysClassPath scp(Arguments::get_sysclasspath());
2028 bool scp_assembly_required = false;
2029
2030 // Save default settings for some mode flags
2031 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2032 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2033 Arguments::_ClipInlining = ClipInlining;
2034 Arguments::_BackgroundCompilation = BackgroundCompilation;
2035
2036 // Setup flags for mixed which is the default
2037 set_mode_flags(_mixed);
2038
2039 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2040 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2041 if (result != JNI_OK) {
2042 return result;
2043 }
2044
2045 // Parse JavaVMInitArgs structure passed in
2046 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2047 if (result != JNI_OK) {
2048 return result;
2049 }
2050
2051 if (AggressiveOpts) {
2052 // Insert alt-rt.jar between user-specified bootclasspath
2053 // prefix and the default bootclasspath. os::set_boot_path()
2054 // uses meta_index_dir as the default bootclasspath directory.
2055 const char* altclasses_jar = "alt-rt.jar";
2056 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2057 strlen(altclasses_jar);
2058 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
2059 strcpy(altclasses_path, get_meta_index_dir());
2060 strcat(altclasses_path, altclasses_jar);
2061 scp.add_suffix_to_prefix(altclasses_path);
2062 scp_assembly_required = true;
2063 FREE_C_HEAP_ARRAY(char, altclasses_path);
2064 }
2065
2066 if (WhiteBoxAPI) {
2067 // Append wb.jar to bootclasspath if enabled
2068 const char* wb_jar = "wb.jar";
2069 size_t wb_path_len = strlen(get_meta_index_dir()) + 1 +
2070 strlen(wb_jar);
2071 char* wb_path = NEW_C_HEAP_ARRAY(char, wb_path_len);
2072 strcpy(wb_path, get_meta_index_dir());
2073 strcat(wb_path, wb_jar);
2074 scp.add_suffix(wb_path);
2075 scp_assembly_required = true;
2076 FREE_C_HEAP_ARRAY(char, wb_path);
2077 }
2078
2079 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2080 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2081 if (result != JNI_OK) {
2082 return result;
2083 }
2084
2085 // Do final processing now that all arguments have been parsed
2086 result = finalize_vm_init_args(&scp, scp_assembly_required);
2087 if (result != JNI_OK) {
2088 return result;
2089 }
2090
2091 return JNI_OK;
2092 }
2093
2094 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2095 SysClassPath* scp_p,
2096 bool* scp_assembly_required_p,
2097 FlagValueOrigin origin) {
2098 // Remaining part of option string
2099 const char* tail;
2100
2101 // iterate over arguments
2102 for (int index = 0; index < args->nOptions; index++) {
2103 bool is_absolute_path = false; // for -agentpath vs -agentlib
2104
2105 const JavaVMOption* option = args->options + index;
2106
2107 if (!match_option(option, "-Djava.class.path", &tail) &&
2108 !match_option(option, "-Dsun.java.command", &tail) &&
2109 !match_option(option, "-Dsun.java.launcher", &tail)) {
2110
2111 // add all jvm options to the jvm_args string. This string
2112 // is used later to set the java.vm.args PerfData string constant.
2113 // the -Djava.class.path and the -Dsun.java.command options are
2114 // omitted from jvm_args string as each have their own PerfData
2115 // string constant object.
2116 build_jvm_args(option->optionString);
2117 }
2118
2119 // -verbose:[class/gc/jni]
2120 if (match_option(option, "-verbose", &tail)) {
2121 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2122 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2123 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2124 } else if (!strcmp(tail, ":gc")) {
2125 FLAG_SET_CMDLINE(bool, PrintGC, true);
2126 } else if (!strcmp(tail, ":jni")) {
2127 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2128 }
2129 // -da / -ea / -disableassertions / -enableassertions
2130 // These accept an optional class/package name separated by a colon, e.g.,
2131 // -da:java.lang.Thread.
2132 } else if (match_option(option, user_assertion_options, &tail, true)) {
2133 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2134 if (*tail == '\0') {
2135 JavaAssertions::setUserClassDefault(enable);
2136 } else {
2137 assert(*tail == ':', "bogus match by match_option()");
2138 JavaAssertions::addOption(tail + 1, enable);
2139 }
2140 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2141 } else if (match_option(option, system_assertion_options, &tail, false)) {
2142 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2143 JavaAssertions::setSystemClassDefault(enable);
2144 // -bootclasspath:
2145 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2146 scp_p->reset_path(tail);
2147 *scp_assembly_required_p = true;
2148 // -bootclasspath/a:
2149 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2150 scp_p->add_suffix(tail);
2151 *scp_assembly_required_p = true;
2152 // -bootclasspath/p:
2153 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2154 scp_p->add_prefix(tail);
2155 *scp_assembly_required_p = true;
2156 // -Xrun
2157 } else if (match_option(option, "-Xrun", &tail)) {
2158 if (tail != NULL) {
2159 const char* pos = strchr(tail, ':');
2160 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2161 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2162 name[len] = '\0';
2163
2164 char *options = NULL;
2165 if(pos != NULL) {
2166 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2167 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2168 }
2169 #ifdef JVMTI_KERNEL
2170 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2171 warning("profiling and debugging agents are not supported with Kernel VM");
2172 } else
2173 #endif // JVMTI_KERNEL
2174 add_init_library(name, options);
2175 }
2176 // -agentlib and -agentpath
2177 } else if (match_option(option, "-agentlib:", &tail) ||
2178 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2179 if(tail != NULL) {
2180 const char* pos = strchr(tail, '=');
2181 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2182 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2183 name[len] = '\0';
2184
2185 char *options = NULL;
2186 if(pos != NULL) {
2187 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2188 }
2189 #ifdef JVMTI_KERNEL
2190 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2191 warning("profiling and debugging agents are not supported with Kernel VM");
2192 } else
2193 #endif // JVMTI_KERNEL
2194 add_init_agent(name, options, is_absolute_path);
2195
2196 }
2197 // -javaagent
2198 } else if (match_option(option, "-javaagent:", &tail)) {
2199 if(tail != NULL) {
2200 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2201 add_init_agent("instrument", options, false);
2202 }
2203 // -Xnoclassgc
2204 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2205 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2206 // -Xincgc: i-CMS
2207 } else if (match_option(option, "-Xincgc", &tail)) {
2208 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2209 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2210 // -Xnoincgc: no i-CMS
2211 } else if (match_option(option, "-Xnoincgc", &tail)) {
2212 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2213 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2214 // -Xconcgc
2215 } else if (match_option(option, "-Xconcgc", &tail)) {
2216 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2217 // -Xnoconcgc
2218 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2219 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2220 // -Xbatch
2221 } else if (match_option(option, "-Xbatch", &tail)) {
2222 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2223 // -Xmn for compatibility with other JVM vendors
2224 } else if (match_option(option, "-Xmn", &tail)) {
2225 julong long_initial_eden_size = 0;
2226 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2227 if (errcode != arg_in_range) {
2228 jio_fprintf(defaultStream::error_stream(),
2229 "Invalid initial eden size: %s\n", option->optionString);
2230 describe_range_error(errcode);
2231 return JNI_EINVAL;
2232 }
2233 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2234 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2235 // -Xms
2236 } else if (match_option(option, "-Xms", &tail)) {
2237 julong long_initial_heap_size = 0;
2238 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2239 if (errcode != arg_in_range) {
2240 jio_fprintf(defaultStream::error_stream(),
2241 "Invalid initial heap size: %s\n", option->optionString);
2242 describe_range_error(errcode);
2243 return JNI_EINVAL;
2244 }
2245 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2246 // Currently the minimum size and the initial heap sizes are the same.
2247 set_min_heap_size(InitialHeapSize);
2248 // -Xmx
2249 } else if (match_option(option, "-Xmx", &tail)) {
2250 julong long_max_heap_size = 0;
2251 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2252 if (errcode != arg_in_range) {
2253 jio_fprintf(defaultStream::error_stream(),
2254 "Invalid maximum heap size: %s\n", option->optionString);
2255 describe_range_error(errcode);
2256 return JNI_EINVAL;
2257 }
2258 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2259 // Xmaxf
2260 } else if (match_option(option, "-Xmaxf", &tail)) {
2261 int maxf = (int)(atof(tail) * 100);
2262 if (maxf < 0 || maxf > 100) {
2263 jio_fprintf(defaultStream::error_stream(),
2264 "Bad max heap free percentage size: %s\n",
2265 option->optionString);
2266 return JNI_EINVAL;
2267 } else {
2268 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2269 }
2270 // Xminf
2271 } else if (match_option(option, "-Xminf", &tail)) {
2272 int minf = (int)(atof(tail) * 100);
2273 if (minf < 0 || minf > 100) {
2274 jio_fprintf(defaultStream::error_stream(),
2275 "Bad min heap free percentage size: %s\n",
2276 option->optionString);
2277 return JNI_EINVAL;
2278 } else {
2279 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2280 }
2281 // -Xss
2282 } else if (match_option(option, "-Xss", &tail)) {
2283 julong long_ThreadStackSize = 0;
2284 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2285 if (errcode != arg_in_range) {
2286 jio_fprintf(defaultStream::error_stream(),
2287 "Invalid thread stack size: %s\n", option->optionString);
2288 describe_range_error(errcode);
2289 return JNI_EINVAL;
2290 }
2291 // Internally track ThreadStackSize in units of 1024 bytes.
2292 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2293 round_to((int)long_ThreadStackSize, K) / K);
2294 // -Xoss
2295 } else if (match_option(option, "-Xoss", &tail)) {
2296 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2297 // -Xmaxjitcodesize
2298 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2299 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2300 julong long_ReservedCodeCacheSize = 0;
2301 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2302 (size_t)InitialCodeCacheSize);
2303 if (errcode != arg_in_range) {
2304 jio_fprintf(defaultStream::error_stream(),
2305 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2306 option->optionString, InitialCodeCacheSize/K);
2307 describe_range_error(errcode);
2308 return JNI_EINVAL;
2309 }
2310 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2311 // -green
2312 } else if (match_option(option, "-green", &tail)) {
2313 jio_fprintf(defaultStream::error_stream(),
2314 "Green threads support not available\n");
2315 return JNI_EINVAL;
2316 // -native
2317 } else if (match_option(option, "-native", &tail)) {
2318 // HotSpot always uses native threads, ignore silently for compatibility
2319 // -Xsqnopause
2320 } else if (match_option(option, "-Xsqnopause", &tail)) {
2321 // EVM option, ignore silently for compatibility
2322 // -Xrs
2323 } else if (match_option(option, "-Xrs", &tail)) {
2324 // Classic/EVM option, new functionality
2325 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2326 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2327 // change default internal VM signals used - lower case for back compat
2328 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2329 // -Xoptimize
2330 } else if (match_option(option, "-Xoptimize", &tail)) {
2331 // EVM option, ignore silently for compatibility
2332 // -Xprof
2333 } else if (match_option(option, "-Xprof", &tail)) {
2334 #ifndef FPROF_KERNEL
2335 _has_profile = true;
2336 #else // FPROF_KERNEL
2337 // do we have to exit?
2338 warning("Kernel VM does not support flat profiling.");
2339 #endif // FPROF_KERNEL
2340 // -Xaprof
2341 } else if (match_option(option, "-Xaprof", &tail)) {
2342 _has_alloc_profile = true;
2343 // -Xconcurrentio
2344 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2345 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2346 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2347 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2348 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2349 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2350
2351 // -Xinternalversion
2352 } else if (match_option(option, "-Xinternalversion", &tail)) {
2353 jio_fprintf(defaultStream::output_stream(), "%s\n",
2354 VM_Version::internal_vm_info_string());
2355 vm_exit(0);
2356 #ifndef PRODUCT
2357 // -Xprintflags
2358 } else if (match_option(option, "-Xprintflags", &tail)) {
2359 CommandLineFlags::printFlags(tty, false);
2360 vm_exit(0);
2361 #endif
2362 // -D
2363 } else if (match_option(option, "-D", &tail)) {
2364 if (!add_property(tail)) {
2365 return JNI_ENOMEM;
2366 }
2367 // Out of the box management support
2368 if (match_option(option, "-Dcom.sun.management", &tail)) {
2369 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2370 }
2371 // -Xint
2372 } else if (match_option(option, "-Xint", &tail)) {
2373 set_mode_flags(_int);
2374 // -Xmixed
2375 } else if (match_option(option, "-Xmixed", &tail)) {
2376 set_mode_flags(_mixed);
2377 // -Xcomp
2378 } else if (match_option(option, "-Xcomp", &tail)) {
2379 // for testing the compiler; turn off all flags that inhibit compilation
2380 set_mode_flags(_comp);
2381
2382 // -Xshare:dump
2383 } else if (match_option(option, "-Xshare:dump", &tail)) {
2384 #ifdef TIERED
2385 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2386 set_mode_flags(_int); // Prevent compilation, which creates objects
2387 #elif defined(COMPILER2)
2388 vm_exit_during_initialization(
2389 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2390 #elif defined(KERNEL)
2391 vm_exit_during_initialization(
2392 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2393 #else
2394 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2395 set_mode_flags(_int); // Prevent compilation, which creates objects
2396 #endif
2397 // -Xshare:on
2398 } else if (match_option(option, "-Xshare:on", &tail)) {
2399 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2400 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2401 // -Xshare:auto
2402 } else if (match_option(option, "-Xshare:auto", &tail)) {
2403 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2404 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2405 // -Xshare:off
2406 } else if (match_option(option, "-Xshare:off", &tail)) {
2407 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2408 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2409
2410 // -Xverify
2411 } else if (match_option(option, "-Xverify", &tail)) {
2412 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2413 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2414 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2415 } else if (strcmp(tail, ":remote") == 0) {
2416 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2417 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2418 } else if (strcmp(tail, ":none") == 0) {
2419 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2420 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2421 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2422 return JNI_EINVAL;
2423 }
2424 // -Xdebug
2425 } else if (match_option(option, "-Xdebug", &tail)) {
2426 // note this flag has been used, then ignore
2427 set_xdebug_mode(true);
2428 // -Xnoagent
2429 } else if (match_option(option, "-Xnoagent", &tail)) {
2430 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2431 } else if (match_option(option, "-Xboundthreads", &tail)) {
2432 // Bind user level threads to kernel threads (Solaris only)
2433 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2434 } else if (match_option(option, "-Xloggc:", &tail)) {
2435 // Redirect GC output to the file. -Xloggc:<filename>
2436 // ostream_init_log(), when called will use this filename
2437 // to initialize a fileStream.
2438 _gc_log_filename = strdup(tail);
2439 FLAG_SET_CMDLINE(bool, PrintGC, true);
2440 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2441
2442 // JNI hooks
2443 } else if (match_option(option, "-Xcheck", &tail)) {
2444 if (!strcmp(tail, ":jni")) {
2445 CheckJNICalls = true;
2446 } else if (is_bad_option(option, args->ignoreUnrecognized,
2447 "check")) {
2448 return JNI_EINVAL;
2449 }
2450 } else if (match_option(option, "vfprintf", &tail)) {
2451 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2452 } else if (match_option(option, "exit", &tail)) {
2453 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2454 } else if (match_option(option, "abort", &tail)) {
2455 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2456 // -XX:+AggressiveHeap
2457 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2458
2459 // This option inspects the machine and attempts to set various
2460 // parameters to be optimal for long-running, memory allocation
2461 // intensive jobs. It is intended for machines with large
2462 // amounts of cpu and memory.
2463
2464 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2465 // VM, but we may not be able to represent the total physical memory
2466 // available (like having 8gb of memory on a box but using a 32bit VM).
2467 // Thus, we need to make sure we're using a julong for intermediate
2468 // calculations.
2469 julong initHeapSize;
2470 julong total_memory = os::physical_memory();
2471
2472 if (total_memory < (julong)256*M) {
2473 jio_fprintf(defaultStream::error_stream(),
2474 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2475 vm_exit(1);
2476 }
2477
2478 // The heap size is half of available memory, or (at most)
2479 // all of possible memory less 160mb (leaving room for the OS
2480 // when using ISM). This is the maximum; because adaptive sizing
2481 // is turned on below, the actual space used may be smaller.
2482
2483 initHeapSize = MIN2(total_memory / (julong)2,
2484 total_memory - (julong)160*M);
2485
2486 // Make sure that if we have a lot of memory we cap the 32 bit
2487 // process space. The 64bit VM version of this function is a nop.
2488 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2489
2490 // The perm gen is separate but contiguous with the
2491 // object heap (and is reserved with it) so subtract it
2492 // from the heap size.
2493 if (initHeapSize > MaxPermSize) {
2494 initHeapSize = initHeapSize - MaxPermSize;
2495 } else {
2496 warning("AggressiveHeap and MaxPermSize values may conflict");
2497 }
2498
2499 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2500 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2501 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2502 // Currently the minimum size and the initial heap sizes are the same.
2503 set_min_heap_size(initHeapSize);
2504 }
2505 if (FLAG_IS_DEFAULT(NewSize)) {
2506 // Make the young generation 3/8ths of the total heap.
2507 FLAG_SET_CMDLINE(uintx, NewSize,
2508 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2509 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2510 }
2511
2512 FLAG_SET_DEFAULT(UseLargePages, true);
2513
2514 // Increase some data structure sizes for efficiency
2515 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2516 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2517 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2518
2519 // See the OldPLABSize comment below, but replace 'after promotion'
2520 // with 'after copying'. YoungPLABSize is the size of the survivor
2521 // space per-gc-thread buffers. The default is 4kw.
2522 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2523
2524 // OldPLABSize is the size of the buffers in the old gen that
2525 // UseParallelGC uses to promote live data that doesn't fit in the
2526 // survivor spaces. At any given time, there's one for each gc thread.
2527 // The default size is 1kw. These buffers are rarely used, since the
2528 // survivor spaces are usually big enough. For specjbb, however, there
2529 // are occasions when there's lots of live data in the young gen
2530 // and we end up promoting some of it. We don't have a definite
2531 // explanation for why bumping OldPLABSize helps, but the theory
2532 // is that a bigger PLAB results in retaining something like the
2533 // original allocation order after promotion, which improves mutator
2534 // locality. A minor effect may be that larger PLABs reduce the
2535 // number of PLAB allocation events during gc. The value of 8kw
2536 // was arrived at by experimenting with specjbb.
2537 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2538
2539 // Enable parallel GC and adaptive generation sizing
2540 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2541 FLAG_SET_DEFAULT(ParallelGCThreads,
2542 Abstract_VM_Version::parallel_worker_threads());
2543
2544 // Encourage steady state memory management
2545 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2546
2547 // This appears to improve mutator locality
2548 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2549
2550 // Get around early Solaris scheduling bug
2551 // (affinity vs other jobs on system)
2552 // but disallow DR and offlining (5008695).
2553 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2554
2555 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2556 // The last option must always win.
2557 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2558 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2559 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2560 // The last option must always win.
2561 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2562 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2563 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2564 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2565 jio_fprintf(defaultStream::error_stream(),
2566 "Please use CMSClassUnloadingEnabled in place of "
2567 "CMSPermGenSweepingEnabled in the future\n");
2568 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2569 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2570 jio_fprintf(defaultStream::error_stream(),
2571 "Please use -XX:+UseGCOverheadLimit in place of "
2572 "-XX:+UseGCTimeLimit in the future\n");
2573 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2574 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2575 jio_fprintf(defaultStream::error_stream(),
2576 "Please use -XX:-UseGCOverheadLimit in place of "
2577 "-XX:-UseGCTimeLimit in the future\n");
2578 // The TLE options are for compatibility with 1.3 and will be
2579 // removed without notice in a future release. These options
2580 // are not to be documented.
2581 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2582 // No longer used.
2583 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2584 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2585 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2586 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2587 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2588 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2589 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2590 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2591 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2592 // No longer used.
2593 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2594 julong long_tlab_size = 0;
2595 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2596 if (errcode != arg_in_range) {
2597 jio_fprintf(defaultStream::error_stream(),
2598 "Invalid TLAB size: %s\n", option->optionString);
2599 describe_range_error(errcode);
2600 return JNI_EINVAL;
2601 }
2602 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2603 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2604 // No longer used.
2605 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2606 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2607 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2608 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2609 SOLARIS_ONLY(
2610 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2611 warning("-XX:+UsePermISM is obsolete.");
2612 FLAG_SET_CMDLINE(bool, UseISM, true);
2613 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2614 FLAG_SET_CMDLINE(bool, UseISM, false);
2615 )
2616 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2617 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2618 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2619 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2620 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2621 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2622 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2623 #if defined(DTRACE_ENABLED)
2624 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2625 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2626 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2627 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2628 #else // defined(DTRACE_ENABLED)
2629 jio_fprintf(defaultStream::error_stream(),
2630 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2631 return JNI_EINVAL;
2632 #endif // defined(DTRACE_ENABLED)
2633 #ifdef ASSERT
2634 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2635 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2636 // disable scavenge before parallel mark-compact
2637 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2638 #endif
2639 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2640 julong cms_blocks_to_claim = (julong)atol(tail);
2641 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2642 jio_fprintf(defaultStream::error_stream(),
2643 "Please use -XX:OldPLABSize in place of "
2644 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2645 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2646 julong cms_blocks_to_claim = (julong)atol(tail);
2647 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2648 jio_fprintf(defaultStream::error_stream(),
2649 "Please use -XX:OldPLABSize in place of "
2650 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2651 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2652 julong old_plab_size = 0;
2653 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2654 if (errcode != arg_in_range) {
2655 jio_fprintf(defaultStream::error_stream(),
2656 "Invalid old PLAB size: %s\n", option->optionString);
2657 describe_range_error(errcode);
2658 return JNI_EINVAL;
2659 }
2660 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2661 jio_fprintf(defaultStream::error_stream(),
2662 "Please use -XX:OldPLABSize in place of "
2663 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2664 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2665 julong young_plab_size = 0;
2666 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2667 if (errcode != arg_in_range) {
2668 jio_fprintf(defaultStream::error_stream(),
2669 "Invalid young PLAB size: %s\n", option->optionString);
2670 describe_range_error(errcode);
2671 return JNI_EINVAL;
2672 }
2673 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2674 jio_fprintf(defaultStream::error_stream(),
2675 "Please use -XX:YoungPLABSize in place of "
2676 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2677 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2678 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2679 julong stack_size = 0;
2680 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2681 if (errcode != arg_in_range) {
2682 jio_fprintf(defaultStream::error_stream(),
2683 "Invalid mark stack size: %s\n", option->optionString);
2684 describe_range_error(errcode);
2685 return JNI_EINVAL;
2686 }
2687 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2688 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2689 julong max_stack_size = 0;
2690 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2691 if (errcode != arg_in_range) {
2692 jio_fprintf(defaultStream::error_stream(),
2693 "Invalid maximum mark stack size: %s\n",
2694 option->optionString);
2695 describe_range_error(errcode);
2696 return JNI_EINVAL;
2697 }
2698 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2699 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2700 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2701 uintx conc_threads = 0;
2702 if (!parse_uintx(tail, &conc_threads, 1)) {
2703 jio_fprintf(defaultStream::error_stream(),
2704 "Invalid concurrent threads: %s\n", option->optionString);
2705 return JNI_EINVAL;
2706 }
2707 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2708 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2709 // Skip -XX:Flags= since that case has already been handled
2710 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2711 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2712 return JNI_EINVAL;
2713 }
2714 }
2715 // Unknown option
2716 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2717 return JNI_ERR;
2718 }
2719 }
2720
2721 // Change the default value for flags which have different default values
2722 // when working with older JDKs.
2723 if (JDK_Version::current().compare_major(6) <= 0 &&
2724 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2725 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2726 }
2727 #ifdef LINUX
2728 if (JDK_Version::current().compare_major(6) <= 0 &&
2729 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2730 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2731 }
2732 #endif // LINUX
2733 return JNI_OK;
2734 }
2735
2736 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2737 // This must be done after all -D arguments have been processed.
2738 scp_p->expand_endorsed();
2739
2740 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2741 // Assemble the bootclasspath elements into the final path.
2742 Arguments::set_sysclasspath(scp_p->combined_path());
2743 }
2744
2745 // This must be done after all arguments have been processed.
2746 // java_compiler() true means set to "NONE" or empty.
2747 if (java_compiler() && !xdebug_mode()) {
2748 // For backwards compatibility, we switch to interpreted mode if
2749 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2750 // not specified.
2751 set_mode_flags(_int);
2752 }
2753 if (CompileThreshold == 0) {
2754 set_mode_flags(_int);
2755 }
2756
2757 #ifndef COMPILER2
2758 // Don't degrade server performance for footprint
2759 if (FLAG_IS_DEFAULT(UseLargePages) &&
2760 MaxHeapSize < LargePageHeapSizeThreshold) {
2761 // No need for large granularity pages w/small heaps.
2762 // Note that large pages are enabled/disabled for both the
2763 // Java heap and the code cache.
2764 FLAG_SET_DEFAULT(UseLargePages, false);
2765 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2766 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2767 }
2768
2769 // Tiered compilation is undefined with C1.
2770 TieredCompilation = false;
2771 #else
2772 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2773 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2774 }
2775 #endif
2776
2777 // If we are running in a headless jre, force java.awt.headless property
2778 // to be true unless the property has already been set.
2779 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2780 if (os::is_headless_jre()) {
2781 const char* headless = Arguments::get_property("java.awt.headless");
2782 if (headless == NULL) {
2783 char envbuffer[128];
2784 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2785 if (!add_property("java.awt.headless=true")) {
2786 return JNI_ENOMEM;
2787 }
2788 } else {
2789 char buffer[256];
2790 strcpy(buffer, "java.awt.headless=");
2791 strcat(buffer, envbuffer);
2792 if (!add_property(buffer)) {
2793 return JNI_ENOMEM;
2794 }
2795 }
2796 }
2797 }
2798
2799 if (!check_vm_args_consistency()) {
2800 return JNI_ERR;
2801 }
2802
2803 return JNI_OK;
2804 }
2805
2806 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2807 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2808 scp_assembly_required_p);
2809 }
2810
2811 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2812 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2813 scp_assembly_required_p);
2814 }
2815
2816 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2817 const int N_MAX_OPTIONS = 64;
2818 const int OPTION_BUFFER_SIZE = 1024;
2819 char buffer[OPTION_BUFFER_SIZE];
2820
2821 // The variable will be ignored if it exceeds the length of the buffer.
2822 // Don't check this variable if user has special privileges
2823 // (e.g. unix su command).
2824 if (os::getenv(name, buffer, sizeof(buffer)) &&
2825 !os::have_special_privileges()) {
2826 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2827 jio_fprintf(defaultStream::error_stream(),
2828 "Picked up %s: %s\n", name, buffer);
2829 char* rd = buffer; // pointer to the input string (rd)
2830 int i;
2831 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2832 while (isspace(*rd)) rd++; // skip whitespace
2833 if (*rd == 0) break; // we re done when the input string is read completely
2834
2835 // The output, option string, overwrites the input string.
2836 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2837 // input string (rd).
2838 char* wrt = rd;
2839
2840 options[i++].optionString = wrt; // Fill in option
2841 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2842 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2843 int quote = *rd; // matching quote to look for
2844 rd++; // don't copy open quote
2845 while (*rd != quote) { // include everything (even spaces) up until quote
2846 if (*rd == 0) { // string termination means unmatched string
2847 jio_fprintf(defaultStream::error_stream(),
2848 "Unmatched quote in %s\n", name);
2849 return JNI_ERR;
2850 }
2851 *wrt++ = *rd++; // copy to option string
2852 }
2853 rd++; // don't copy close quote
2854 } else {
2855 *wrt++ = *rd++; // copy to option string
2856 }
2857 }
2858 // Need to check if we're done before writing a NULL,
2859 // because the write could be to the byte that rd is pointing to.
2860 if (*rd++ == 0) {
2861 *wrt = 0;
2862 break;
2863 }
2864 *wrt = 0; // Zero terminate option
2865 }
2866 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2867 JavaVMInitArgs vm_args;
2868 vm_args.version = JNI_VERSION_1_2;
2869 vm_args.options = options;
2870 vm_args.nOptions = i;
2871 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2872
2873 if (PrintVMOptions) {
2874 const char* tail;
2875 for (int i = 0; i < vm_args.nOptions; i++) {
2876 const JavaVMOption *option = vm_args.options + i;
2877 if (match_option(option, "-XX:", &tail)) {
2878 logOption(tail);
2879 }
2880 }
2881 }
2882
2883 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2884 }
2885 return JNI_OK;
2886 }
2887
2888 void Arguments::set_shared_spaces_flags() {
2889 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
2890 const bool might_share = must_share || UseSharedSpaces;
2891
2892 // The string table is part of the shared archive so the size must match.
2893 if (!FLAG_IS_DEFAULT(StringTableSize)) {
2894 // Disable sharing.
2895 if (must_share) {
2896 warning("disabling shared archive %s because of non-default "
2897 "StringTableSize", DumpSharedSpaces ? "creation" : "use");
2898 }
2899 if (might_share) {
2900 FLAG_SET_DEFAULT(DumpSharedSpaces, false);
2901 FLAG_SET_DEFAULT(RequireSharedSpaces, false);
2902 FLAG_SET_DEFAULT(UseSharedSpaces, false);
2903 }
2904 return;
2905 }
2906
2907 // Check whether class data sharing settings conflict with GC, compressed oops
2908 // or page size, and fix them up. Explicit sharing options override other
2909 // settings.
2910 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
2911 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
2912 UseCompressedOops || UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
2913 if (cannot_share) {
2914 if (must_share) {
2915 warning("selecting serial gc and disabling large pages %s"
2916 "because of %s", "" LP64_ONLY("and compressed oops "),
2917 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
2918 force_serial_gc();
2919 FLAG_SET_CMDLINE(bool, UseLargePages, false);
2920 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
2921 } else {
2922 if (UseSharedSpaces && Verbose) {
2923 warning("turning off use of shared archive because of "
2924 "choice of garbage collector or large pages");
2925 }
2926 no_shared_spaces();
2927 }
2928 } else if (UseLargePages && might_share) {
2929 // Disable large pages to allow shared spaces. This is sub-optimal, since
2930 // there may not even be a shared archive to use.
2931 FLAG_SET_DEFAULT(UseLargePages, false);
2932 }
2933 }
2934
2935 // Disable options not supported in this release, with a warning if they
2936 // were explicitly requested on the command-line
2937 #define UNSUPPORTED_OPTION(opt, description) \
2938 do { \
2939 if (opt) { \
2940 if (FLAG_IS_CMDLINE(opt)) { \
2941 warning(description " is disabled in this release."); \
2942 } \
2943 FLAG_SET_DEFAULT(opt, false); \
2944 } \
2945 } while(0)
2946
2947 // Parse entry point called from JNI_CreateJavaVM
2948
2949 jint Arguments::parse(const JavaVMInitArgs* args) {
2950
2951 // Sharing support
2952 // Construct the path to the archive
2953 char jvm_path[JVM_MAXPATHLEN];
2954 os::jvm_path(jvm_path, sizeof(jvm_path));
2955 char *end = strrchr(jvm_path, *os::file_separator());
2956 if (end != NULL) *end = '\0';
2957 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2958 strlen(os::file_separator()) + 20);
2959 if (shared_archive_path == NULL) return JNI_ENOMEM;
2960 strcpy(shared_archive_path, jvm_path);
2961 strcat(shared_archive_path, os::file_separator());
2962 strcat(shared_archive_path, "classes");
2963 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2964 strcat(shared_archive_path, ".jsa");
2965 SharedArchivePath = shared_archive_path;
2966
2967 // Remaining part of option string
2968 const char* tail;
2969
2970 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2971 bool settings_file_specified = false;
2972 const char* flags_file;
2973 int index;
2974 for (index = 0; index < args->nOptions; index++) {
2975 const JavaVMOption *option = args->options + index;
2976 if (match_option(option, "-XX:Flags=", &tail)) {
2977 flags_file = tail;
2978 settings_file_specified = true;
2979 }
2980 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2981 PrintVMOptions = true;
2982 }
2983 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2984 PrintVMOptions = false;
2985 }
2986 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2987 IgnoreUnrecognizedVMOptions = true;
2988 }
2989 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2990 IgnoreUnrecognizedVMOptions = false;
2991 }
2992 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2993 CommandLineFlags::printFlags(tty, false);
2994 vm_exit(0);
2995 }
2996
2997 #ifndef PRODUCT
2998 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
2999 CommandLineFlags::printFlags(tty, true);
3000 vm_exit(0);
3001 }
3002 #endif
3003 }
3004
3005 if (IgnoreUnrecognizedVMOptions) {
3006 // uncast const to modify the flag args->ignoreUnrecognized
3007 *(jboolean*)(&args->ignoreUnrecognized) = true;
3008 }
3009
3010 // Parse specified settings file
3011 if (settings_file_specified) {
3012 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3013 return JNI_EINVAL;
3014 }
3015 }
3016
3017 // Parse default .hotspotrc settings file
3018 if (!settings_file_specified) {
3019 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3020 return JNI_EINVAL;
3021 }
3022 }
3023
3024 if (PrintVMOptions) {
3025 for (index = 0; index < args->nOptions; index++) {
3026 const JavaVMOption *option = args->options + index;
3027 if (match_option(option, "-XX:", &tail)) {
3028 logOption(tail);
3029 }
3030 }
3031 }
3032
3033 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3034 jint result = parse_vm_init_args(args);
3035 if (result != JNI_OK) {
3036 return result;
3037 }
3038
3039 #ifdef JAVASE_EMBEDDED
3040 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3041 #endif
3042
3043 #ifndef PRODUCT
3044 if (TraceBytecodesAt != 0) {
3045 TraceBytecodes = true;
3046 }
3047 if (CountCompiledCalls) {
3048 if (UseCounterDecay) {
3049 warning("UseCounterDecay disabled because CountCalls is set");
3050 UseCounterDecay = false;
3051 }
3052 }
3053 #endif // PRODUCT
3054
3055 // Transitional
3056 if (EnableMethodHandles || AnonymousClasses) {
3057 if (!EnableInvokeDynamic && !FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3058 warning("EnableMethodHandles and AnonymousClasses are obsolete. Keeping EnableInvokeDynamic disabled.");
3059 } else {
3060 EnableInvokeDynamic = true;
3061 }
3062 }
3063
3064 // JSR 292 is not supported before 1.7
3065 if (!JDK_Version::is_gte_jdk17x_version()) {
3066 if (EnableInvokeDynamic) {
3067 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3068 warning("JSR 292 is not supported before 1.7. Disabling support.");
3069 }
3070 EnableInvokeDynamic = false;
3071 }
3072 }
3073
3074 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3075 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3076 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3077 }
3078 ScavengeRootsInCode = 1;
3079 }
3080 if (!JavaObjectsInPerm && ScavengeRootsInCode == 0) {
3081 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3082 warning("forcing ScavengeRootsInCode non-zero because JavaObjectsInPerm is false");
3083 }
3084 ScavengeRootsInCode = 1;
3085 }
3086
3087 if (PrintGCDetails) {
3088 // Turn on -verbose:gc options as well
3089 PrintGC = true;
3090 }
3091
3092 // Set object alignment values.
3093 set_object_alignment();
3094
3095 #ifdef SERIALGC
3096 force_serial_gc();
3097 #endif // SERIALGC
3098 #ifdef KERNEL
3099 no_shared_spaces();
3100 #endif // KERNEL
3101
3102 // Set flags based on ergonomics.
3103 set_ergonomics_flags();
3104
3105 set_shared_spaces_flags();
3106
3107 // Check the GC selections again.
3108 if (!check_gc_consistency()) {
3109 return JNI_EINVAL;
3110 }
3111
3112 if (TieredCompilation) {
3113 set_tiered_flags();
3114 } else {
3115 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3116 if (CompilationPolicyChoice >= 2) {
3117 vm_exit_during_initialization(
3118 "Incompatible compilation policy selected", NULL);
3119 }
3120 }
3121
3122 #ifndef KERNEL
3123 // Set heap size based on available physical memory
3124 set_heap_size();
3125 // Set per-collector flags
3126 if (UseParallelGC || UseParallelOldGC) {
3127 set_parallel_gc_flags();
3128 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3129 set_cms_and_parnew_gc_flags();
3130 } else if (UseParNewGC) { // skipped if CMS is set above
3131 set_parnew_gc_flags();
3132 } else if (UseG1GC) {
3133 set_g1_gc_flags();
3134 }
3135 #endif // KERNEL
3136
3137 #ifdef SERIALGC
3138 assert(verify_serial_gc_flags(), "SerialGC unset");
3139 #endif // SERIALGC
3140
3141 // Set bytecode rewriting flags
3142 set_bytecode_flags();
3143
3144 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3145 set_aggressive_opts_flags();
3146
3147 // Turn off biased locking for locking debug mode flags,
3148 // which are subtlely different from each other but neither works with
3149 // biased locking.
3150 if (UseHeavyMonitors
3151 #ifdef COMPILER1
3152 || !UseFastLocking
3153 #endif // COMPILER1
3154 ) {
3155 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3156 // flag set to true on command line; warn the user that they
3157 // can't enable biased locking here
3158 warning("Biased Locking is not supported with locking debug flags"
3159 "; ignoring UseBiasedLocking flag." );
3160 }
3161 UseBiasedLocking = false;
3162 }
3163
3164 #ifdef CC_INTERP
3165 // Clear flags not supported by the C++ interpreter
3166 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3167 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3168 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3169 #endif // CC_INTERP
3170
3171 #ifdef COMPILER2
3172 if (!UseBiasedLocking || EmitSync != 0) {
3173 UseOptoBiasInlining = false;
3174 }
3175 if (!EliminateLocks) {
3176 EliminateNestedLocks = false;
3177 }
3178 #endif
3179
3180 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3181 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3182 DebugNonSafepoints = true;
3183 }
3184
3185 #ifndef PRODUCT
3186 if (CompileTheWorld) {
3187 // Force NmethodSweeper to sweep whole CodeCache each time.
3188 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3189 NmethodSweepFraction = 1;
3190 }
3191 }
3192 #endif
3193
3194 if (PrintCommandLineFlags) {
3195 CommandLineFlags::printSetFlags(tty);
3196 }
3197
3198 // Apply CPU specific policy for the BiasedLocking
3199 if (UseBiasedLocking) {
3200 if (!VM_Version::use_biased_locking() &&
3201 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3202 UseBiasedLocking = false;
3203 }
3204 }
3205
3206 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3207 // but only if not already set on the commandline
3208 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3209 bool set = false;
3210 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3211 if (!set) {
3212 FLAG_SET_DEFAULT(PauseAtExit, true);
3213 }
3214 }
3215
3216 return JNI_OK;
3217 }
3218
3219 int Arguments::PropertyList_count(SystemProperty* pl) {
3220 int count = 0;
3221 while(pl != NULL) {
3222 count++;
3223 pl = pl->next();
3224 }
3225 return count;
3226 }
3227
3228 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3229 assert(key != NULL, "just checking");
3230 SystemProperty* prop;
3231 for (prop = pl; prop != NULL; prop = prop->next()) {
3232 if (strcmp(key, prop->key()) == 0) return prop->value();
3233 }
3234 return NULL;
3235 }
3236
3237 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3238 int count = 0;
3239 const char* ret_val = NULL;
3240
3241 while(pl != NULL) {
3242 if(count >= index) {
3243 ret_val = pl->key();
3244 break;
3245 }
3246 count++;
3247 pl = pl->next();
3248 }
3249
3250 return ret_val;
3251 }
3252
3253 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3254 int count = 0;
3255 char* ret_val = NULL;
3256
3257 while(pl != NULL) {
3258 if(count >= index) {
3259 ret_val = pl->value();
3260 break;
3261 }
3262 count++;
3263 pl = pl->next();
3264 }
3265
3266 return ret_val;
3267 }
3268
3269 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3270 SystemProperty* p = *plist;
3271 if (p == NULL) {
3272 *plist = new_p;
3273 } else {
3274 while (p->next() != NULL) {
3275 p = p->next();
3276 }
3277 p->set_next(new_p);
3278 }
3279 }
3280
3281 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3282 if (plist == NULL)
3283 return;
3284
3285 SystemProperty* new_p = new SystemProperty(k, v, true);
3286 PropertyList_add(plist, new_p);
3287 }
3288
3289 // This add maintains unique property key in the list.
3290 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3291 if (plist == NULL)
3292 return;
3293
3294 // If property key exist then update with new value.
3295 SystemProperty* prop;
3296 for (prop = *plist; prop != NULL; prop = prop->next()) {
3297 if (strcmp(k, prop->key()) == 0) {
3298 if (append) {
3299 prop->append_value(v);
3300 } else {
3301 prop->set_value(v);
3302 }
3303 return;
3304 }
3305 }
3306
3307 PropertyList_add(plist, k, v);
3308 }
3309
3310 #ifdef KERNEL
3311 char *Arguments::get_kernel_properties() {
3312 // Find properties starting with kernel and append them to string
3313 // We need to find out how long they are first because the URL's that they
3314 // might point to could get long.
3315 int length = 0;
3316 SystemProperty* prop;
3317 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3318 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3319 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3320 }
3321 }
3322 // Add one for null terminator.
3323 char *props = AllocateHeap(length + 1, "get_kernel_properties");
3324 if (length != 0) {
3325 int pos = 0;
3326 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3327 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3328 jio_snprintf(&props[pos], length-pos,
3329 "-D%s=%s ", prop->key(), prop->value());
3330 pos = strlen(props);
3331 }
3332 }
3333 }
3334 // null terminate props in case of null
3335 props[length] = '\0';
3336 return props;
3337 }
3338 #endif // KERNEL
3339
3340 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3341 // Returns true if all of the source pointed by src has been copied over to
3342 // the destination buffer pointed by buf. Otherwise, returns false.
3343 // Notes:
3344 // 1. If the length (buflen) of the destination buffer excluding the
3345 // NULL terminator character is not long enough for holding the expanded
3346 // pid characters, it also returns false instead of returning the partially
3347 // expanded one.
3348 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3349 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3350 char* buf, size_t buflen) {
3351 const char* p = src;
3352 char* b = buf;
3353 const char* src_end = &src[srclen];
3354 char* buf_end = &buf[buflen - 1];
3355
3356 while (p < src_end && b < buf_end) {
3357 if (*p == '%') {
3358 switch (*(++p)) {
3359 case '%': // "%%" ==> "%"
3360 *b++ = *p++;
3361 break;
3362 case 'p': { // "%p" ==> current process id
3363 // buf_end points to the character before the last character so
3364 // that we could write '\0' to the end of the buffer.
3365 size_t buf_sz = buf_end - b + 1;
3366 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3367
3368 // if jio_snprintf fails or the buffer is not long enough to hold
3369 // the expanded pid, returns false.
3370 if (ret < 0 || ret >= (int)buf_sz) {
3371 return false;
3372 } else {
3373 b += ret;
3374 assert(*b == '\0', "fail in copy_expand_pid");
3375 if (p == src_end && b == buf_end + 1) {
3376 // reach the end of the buffer.
3377 return true;
3378 }
3379 }
3380 p++;
3381 break;
3382 }
3383 default :
3384 *b++ = '%';
3385 }
3386 } else {
3387 *b++ = *p++;
3388 }
3389 }
3390 *b = '\0';
3391 return (p == src_end); // return false if not all of the source was copied
3392 }