1 /*
2 * Copyright (c) 1997, 2011, 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 static bool force_client_mode = false;
106
107 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
108
109 static bool match_option(const JavaVMOption *option, const char* name,
110 const char** tail) {
111 int len = (int)strlen(name);
112 if (strncmp(option->optionString, name, len) == 0) {
113 *tail = option->optionString + len;
114 return true;
115 } else {
116 return false;
117 }
118 }
119
120 static void logOption(const char* opt) {
121 if (PrintVMOptions) {
122 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
123 }
124 }
125
126 // Process java launcher properties.
127 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
128 // See if sun.java.launcher or sun.java.launcher.pid is defined.
129 // Must do this before setting up other system properties,
130 // as some of them may depend on launcher type.
131 for (int index = 0; index < args->nOptions; index++) {
132 const JavaVMOption* option = args->options + index;
133 const char* tail;
134
135 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
136 process_java_launcher_argument(tail, option->extraInfo);
137 continue;
138 }
139 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
140 _sun_java_launcher_pid = atoi(tail);
141 continue;
142 }
143 }
144 }
145
146 // Initialize system properties key and value.
147 void Arguments::init_system_properties() {
148
149 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
150 "Java Virtual Machine Specification", false));
151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
154
155 // following are JVMTI agent writeable properties.
156 // Properties values are set to NULL and they are
157 // os specific they are initialized in os::init_system_properties_values().
158 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
159 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
160 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
161 _java_library_path = new SystemProperty("java.library.path", NULL, true);
162 _java_home = new SystemProperty("java.home", NULL, true);
163 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
164
165 _java_class_path = new SystemProperty("java.class.path", "", true);
166
167 // Add to System Property list.
168 PropertyList_add(&_system_properties, _java_ext_dirs);
169 PropertyList_add(&_system_properties, _java_endorsed_dirs);
170 PropertyList_add(&_system_properties, _sun_boot_library_path);
171 PropertyList_add(&_system_properties, _java_library_path);
172 PropertyList_add(&_system_properties, _java_home);
173 PropertyList_add(&_system_properties, _java_class_path);
174 PropertyList_add(&_system_properties, _sun_boot_class_path);
175
176 // Set OS specific system properties values
177 os::init_system_properties_values();
178 }
179
180
181 // Update/Initialize System properties after JDK version number is known
182 void Arguments::init_version_specific_system_properties() {
183 enum { bufsz = 16 };
184 char buffer[bufsz];
185 const char* spec_vendor = "Sun Microsystems Inc.";
186 uint32_t spec_version = 0;
187
188 if (JDK_Version::is_gte_jdk17x_version()) {
189 spec_vendor = "Oracle Corporation";
190 spec_version = JDK_Version::current().major_version();
191 }
192 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
193
194 PropertyList_add(&_system_properties,
195 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
196 PropertyList_add(&_system_properties,
197 new SystemProperty("java.vm.specification.version", buffer, false));
198 PropertyList_add(&_system_properties,
199 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
200 }
201
202 /**
203 * Provide a slightly more user-friendly way of eliminating -XX flags.
204 * When a flag is eliminated, it can be added to this list in order to
205 * continue accepting this flag on the command-line, while issuing a warning
206 * and ignoring the value. Once the JDK version reaches the 'accept_until'
207 * limit, we flatly refuse to admit the existence of the flag. This allows
208 * a flag to die correctly over JDK releases using HSX.
209 */
210 typedef struct {
211 const char* name;
212 JDK_Version obsoleted_in; // when the flag went away
213 JDK_Version accept_until; // which version to start denying the existence
214 } ObsoleteFlag;
215
216 static ObsoleteFlag obsolete_jvm_flags[] = {
217 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
218 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
230 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
231 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
232 { "DefaultInitialRAMFraction",
233 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
234 { "UseDepthFirstScavengeOrder",
235 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
236 { "HandlePromotionFailure",
237 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
238 { "MaxLiveObjectEvacuationRatio",
239 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
240 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
241 { "UseParallelOldGCCompacting",
242 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
243 { "UseParallelDensePrefixUpdate",
244 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
245 { "UseParallelOldGCDensePrefix",
246 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
247 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
248 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
249 #ifdef PRODUCT
250 { "DesiredMethodLimit",
251 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
252 #endif // PRODUCT
253 { NULL, JDK_Version(0), JDK_Version(0) }
254 };
255
256 // Returns true if the flag is obsolete and fits into the range specified
257 // for being ignored. In the case that the flag is ignored, the 'version'
258 // value is filled in with the version number when the flag became
259 // obsolete so that that value can be displayed to the user.
260 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
261 int i = 0;
262 assert(version != NULL, "Must provide a version buffer");
263 while (obsolete_jvm_flags[i].name != NULL) {
264 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
265 // <flag>=xxx form
266 // [-|+]<flag> form
267 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
268 ((s[0] == '+' || s[0] == '-') &&
269 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
270 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
271 *version = flag_status.obsoleted_in;
272 return true;
273 }
274 }
275 i++;
276 }
277 return false;
278 }
279
280 // Constructs the system class path (aka boot class path) from the following
281 // components, in order:
282 //
283 // prefix // from -Xbootclasspath/p:...
284 // endorsed // the expansion of -Djava.endorsed.dirs=...
285 // base // from os::get_system_properties() or -Xbootclasspath=
286 // suffix // from -Xbootclasspath/a:...
287 //
288 // java.endorsed.dirs is a list of directories; any jar or zip files in the
289 // directories are added to the sysclasspath just before the base.
290 //
291 // This could be AllStatic, but it isn't needed after argument processing is
292 // complete.
293 class SysClassPath: public StackObj {
294 public:
295 SysClassPath(const char* base);
296 ~SysClassPath();
297
298 inline void set_base(const char* base);
299 inline void add_prefix(const char* prefix);
300 inline void add_suffix_to_prefix(const char* suffix);
301 inline void add_suffix(const char* suffix);
302 inline void reset_path(const char* base);
303
304 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
305 // property. Must be called after all command-line arguments have been
306 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
307 // combined_path().
308 void expand_endorsed();
309
310 inline const char* get_base() const { return _items[_scp_base]; }
311 inline const char* get_prefix() const { return _items[_scp_prefix]; }
312 inline const char* get_suffix() const { return _items[_scp_suffix]; }
313 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
314
315 // Combine all the components into a single c-heap-allocated string; caller
316 // must free the string if/when no longer needed.
317 char* combined_path();
318
319 private:
320 // Utility routines.
321 static char* add_to_path(const char* path, const char* str, bool prepend);
322 static char* add_jars_to_path(char* path, const char* directory);
323
324 inline void reset_item_at(int index);
325
326 // Array indices for the items that make up the sysclasspath. All except the
327 // base are allocated in the C heap and freed by this class.
328 enum {
329 _scp_prefix, // from -Xbootclasspath/p:...
330 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
331 _scp_base, // the default sysclasspath
332 _scp_suffix, // from -Xbootclasspath/a:...
333 _scp_nitems // the number of items, must be last.
334 };
335
336 const char* _items[_scp_nitems];
337 DEBUG_ONLY(bool _expansion_done;)
338 };
339
340 SysClassPath::SysClassPath(const char* base) {
341 memset(_items, 0, sizeof(_items));
342 _items[_scp_base] = base;
343 DEBUG_ONLY(_expansion_done = false;)
344 }
345
346 SysClassPath::~SysClassPath() {
347 // Free everything except the base.
348 for (int i = 0; i < _scp_nitems; ++i) {
349 if (i != _scp_base) reset_item_at(i);
350 }
351 DEBUG_ONLY(_expansion_done = false;)
352 }
353
354 inline void SysClassPath::set_base(const char* base) {
355 _items[_scp_base] = base;
356 }
357
358 inline void SysClassPath::add_prefix(const char* prefix) {
359 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
360 }
361
362 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
363 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
364 }
365
366 inline void SysClassPath::add_suffix(const char* suffix) {
367 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
368 }
369
370 inline void SysClassPath::reset_item_at(int index) {
371 assert(index < _scp_nitems && index != _scp_base, "just checking");
372 if (_items[index] != NULL) {
373 FREE_C_HEAP_ARRAY(char, _items[index]);
374 _items[index] = NULL;
375 }
376 }
377
378 inline void SysClassPath::reset_path(const char* base) {
379 // Clear the prefix and suffix.
380 reset_item_at(_scp_prefix);
381 reset_item_at(_scp_suffix);
382 set_base(base);
383 }
384
385 //------------------------------------------------------------------------------
386
387 void SysClassPath::expand_endorsed() {
388 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
389
390 const char* path = Arguments::get_property("java.endorsed.dirs");
391 if (path == NULL) {
392 path = Arguments::get_endorsed_dir();
393 assert(path != NULL, "no default for java.endorsed.dirs");
394 }
395
396 char* expanded_path = NULL;
397 const char separator = *os::path_separator();
398 const char* const end = path + strlen(path);
399 while (path < end) {
400 const char* tmp_end = strchr(path, separator);
401 if (tmp_end == NULL) {
402 expanded_path = add_jars_to_path(expanded_path, path);
403 path = end;
404 } else {
405 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
406 memcpy(dirpath, path, tmp_end - path);
407 dirpath[tmp_end - path] = '\0';
408 expanded_path = add_jars_to_path(expanded_path, dirpath);
409 FREE_C_HEAP_ARRAY(char, dirpath);
410 path = tmp_end + 1;
411 }
412 }
413 _items[_scp_endorsed] = expanded_path;
414 DEBUG_ONLY(_expansion_done = true;)
415 }
416
417 // Combine the bootclasspath elements, some of which may be null, into a single
418 // c-heap-allocated string.
419 char* SysClassPath::combined_path() {
420 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
421 assert(_expansion_done, "must call expand_endorsed() first.");
422
423 size_t lengths[_scp_nitems];
424 size_t total_len = 0;
425
426 const char separator = *os::path_separator();
427
428 // Get the lengths.
429 int i;
430 for (i = 0; i < _scp_nitems; ++i) {
431 if (_items[i] != NULL) {
432 lengths[i] = strlen(_items[i]);
433 // Include space for the separator char (or a NULL for the last item).
434 total_len += lengths[i] + 1;
435 }
436 }
437 assert(total_len > 0, "empty sysclasspath not allowed");
438
439 // Copy the _items to a single string.
440 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
441 char* cp_tmp = cp;
442 for (i = 0; i < _scp_nitems; ++i) {
443 if (_items[i] != NULL) {
444 memcpy(cp_tmp, _items[i], lengths[i]);
445 cp_tmp += lengths[i];
446 *cp_tmp++ = separator;
447 }
448 }
449 *--cp_tmp = '\0'; // Replace the extra separator.
450 return cp;
451 }
452
453 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
454 char*
455 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
456 char *cp;
457
458 assert(str != NULL, "just checking");
459 if (path == NULL) {
460 size_t len = strlen(str) + 1;
461 cp = NEW_C_HEAP_ARRAY(char, len);
462 memcpy(cp, str, len); // copy the trailing null
463 } else {
464 const char separator = *os::path_separator();
465 size_t old_len = strlen(path);
466 size_t str_len = strlen(str);
467 size_t len = old_len + str_len + 2;
468
469 if (prepend) {
470 cp = NEW_C_HEAP_ARRAY(char, len);
471 char* cp_tmp = cp;
472 memcpy(cp_tmp, str, str_len);
473 cp_tmp += str_len;
474 *cp_tmp = separator;
475 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
476 FREE_C_HEAP_ARRAY(char, path);
477 } else {
478 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
479 char* cp_tmp = cp + old_len;
480 *cp_tmp = separator;
481 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
482 }
483 }
484 return cp;
485 }
486
487 // Scan the directory and append any jar or zip files found to path.
488 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
489 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
490 DIR* dir = os::opendir(directory);
491 if (dir == NULL) return path;
492
493 char dir_sep[2] = { '\0', '\0' };
494 size_t directory_len = strlen(directory);
495 const char fileSep = *os::file_separator();
496 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
497
498 /* Scan the directory for jars/zips, appending them to path. */
499 struct dirent *entry;
500 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
501 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
502 const char* name = entry->d_name;
503 const char* ext = name + strlen(name) - 4;
504 bool isJarOrZip = ext > name &&
505 (os::file_name_strcmp(ext, ".jar") == 0 ||
506 os::file_name_strcmp(ext, ".zip") == 0);
507 if (isJarOrZip) {
508 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
509 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
510 path = add_to_path(path, jarpath, false);
511 FREE_C_HEAP_ARRAY(char, jarpath);
512 }
513 }
514 FREE_C_HEAP_ARRAY(char, dbuf);
515 os::closedir(dir);
516 return path;
517 }
518
519 // Parses a memory size specification string.
520 static bool atomull(const char *s, julong* result) {
521 julong n = 0;
522 int args_read = sscanf(s, os::julong_format_specifier(), &n);
523 if (args_read != 1) {
524 return false;
525 }
526 while (*s != '\0' && isdigit(*s)) {
527 s++;
528 }
529 // 4705540: illegal if more characters are found after the first non-digit
530 if (strlen(s) > 1) {
531 return false;
532 }
533 switch (*s) {
534 case 'T': case 't':
535 *result = n * G * K;
536 // Check for overflow.
537 if (*result/((julong)G * K) != n) return false;
538 return true;
539 case 'G': case 'g':
540 *result = n * G;
541 if (*result/G != n) return false;
542 return true;
543 case 'M': case 'm':
544 *result = n * M;
545 if (*result/M != n) return false;
546 return true;
547 case 'K': case 'k':
548 *result = n * K;
549 if (*result/K != n) return false;
550 return true;
551 case '\0':
552 *result = n;
553 return true;
554 default:
555 return false;
556 }
557 }
558
559 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
560 if (size < min_size) return arg_too_small;
561 // Check that size will fit in a size_t (only relevant on 32-bit)
562 if (size > max_uintx) return arg_too_big;
563 return arg_in_range;
564 }
565
566 // Describe an argument out of range error
567 void Arguments::describe_range_error(ArgsRange errcode) {
568 switch(errcode) {
569 case arg_too_big:
570 jio_fprintf(defaultStream::error_stream(),
571 "The specified size exceeds the maximum "
572 "representable size.\n");
573 break;
574 case arg_too_small:
575 case arg_unreadable:
576 case arg_in_range:
577 // do nothing for now
578 break;
579 default:
580 ShouldNotReachHere();
581 }
582 }
583
584 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
585 return CommandLineFlags::boolAtPut(name, &value, origin);
586 }
587
588 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
589 double v;
590 if (sscanf(value, "%lf", &v) != 1) {
591 return false;
592 }
593
594 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
595 return true;
596 }
597 return false;
598 }
599
600 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
601 julong v;
602 intx intx_v;
603 bool is_neg = false;
604 // Check the sign first since atomull() parses only unsigned values.
605 if (*value == '-') {
606 if (!CommandLineFlags::intxAt(name, &intx_v)) {
607 return false;
608 }
609 value++;
610 is_neg = true;
611 }
612 if (!atomull(value, &v)) {
613 return false;
614 }
615 intx_v = (intx) v;
616 if (is_neg) {
617 intx_v = -intx_v;
618 }
619 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
620 return true;
621 }
622 uintx uintx_v = (uintx) v;
623 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
624 return true;
625 }
626 uint64_t uint64_t_v = (uint64_t) v;
627 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
628 return true;
629 }
630 return false;
631 }
632
633 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
634 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
635 // Contract: CommandLineFlags always returns a pointer that needs freeing.
636 FREE_C_HEAP_ARRAY(char, value);
637 return true;
638 }
639
640 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
641 const char* old_value = "";
642 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
643 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
644 size_t new_len = strlen(new_value);
645 const char* value;
646 char* free_this_too = NULL;
647 if (old_len == 0) {
648 value = new_value;
649 } else if (new_len == 0) {
650 value = old_value;
651 } else {
652 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
653 // each new setting adds another LINE to the switch:
654 sprintf(buf, "%s\n%s", old_value, new_value);
655 value = buf;
656 free_this_too = buf;
657 }
658 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
659 // CommandLineFlags always returns a pointer that needs freeing.
660 FREE_C_HEAP_ARRAY(char, value);
661 if (free_this_too != NULL) {
662 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
663 FREE_C_HEAP_ARRAY(char, free_this_too);
664 }
665 return true;
666 }
667
668 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
669
670 // range of acceptable characters spelled out for portability reasons
671 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
672 #define BUFLEN 255
673 char name[BUFLEN+1];
674 char dummy;
675
676 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
677 return set_bool_flag(name, false, origin);
678 }
679 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
680 return set_bool_flag(name, true, origin);
681 }
682
683 char punct;
684 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
685 const char* value = strchr(arg, '=') + 1;
686 Flag* flag = Flag::find_flag(name, strlen(name));
687 if (flag != NULL && flag->is_ccstr()) {
688 if (flag->ccstr_accumulates()) {
689 return append_to_string_flag(name, value, origin);
690 } else {
691 if (value[0] == '\0') {
692 value = NULL;
693 }
694 return set_string_flag(name, value, origin);
695 }
696 }
697 }
698
699 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
700 const char* value = strchr(arg, '=') + 1;
701 // -XX:Foo:=xxx will reset the string flag to the given value.
702 if (value[0] == '\0') {
703 value = NULL;
704 }
705 return set_string_flag(name, value, origin);
706 }
707
708 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
709 #define SIGNED_NUMBER_RANGE "[-0123456789]"
710 #define NUMBER_RANGE "[0123456789]"
711 char value[BUFLEN + 1];
712 char value2[BUFLEN + 1];
713 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
714 // Looks like a floating-point number -- try again with more lenient format string
715 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
716 return set_fp_numeric_flag(name, value, origin);
717 }
718 }
719
720 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
721 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
722 return set_numeric_flag(name, value, origin);
723 }
724
725 return false;
726 }
727
728 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
729 assert(bldarray != NULL, "illegal argument");
730
731 if (arg == NULL) {
732 return;
733 }
734
735 int index = *count;
736
737 // expand the array and add arg to the last element
738 (*count)++;
739 if (*bldarray == NULL) {
740 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
741 } else {
742 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
743 }
744 (*bldarray)[index] = strdup(arg);
745 }
746
747 void Arguments::build_jvm_args(const char* arg) {
748 add_string(&_jvm_args_array, &_num_jvm_args, arg);
749 }
750
751 void Arguments::build_jvm_flags(const char* arg) {
752 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
753 }
754
755 // utility function to return a string that concatenates all
756 // strings in a given char** array
757 const char* Arguments::build_resource_string(char** args, int count) {
758 if (args == NULL || count == 0) {
759 return NULL;
760 }
761 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
762 for (int i = 1; i < count; i++) {
763 length += strlen(args[i]) + 1; // add 1 for a space
764 }
765 char* s = NEW_RESOURCE_ARRAY(char, length);
766 strcpy(s, args[0]);
767 for (int j = 1; j < count; j++) {
768 strcat(s, " ");
769 strcat(s, args[j]);
770 }
771 return (const char*) s;
772 }
773
774 void Arguments::print_on(outputStream* st) {
775 st->print_cr("VM Arguments:");
776 if (num_jvm_flags() > 0) {
777 st->print("jvm_flags: "); print_jvm_flags_on(st);
778 }
779 if (num_jvm_args() > 0) {
780 st->print("jvm_args: "); print_jvm_args_on(st);
781 }
782 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
783 st->print_cr("Launcher Type: %s", _sun_java_launcher);
784 }
785
786 void Arguments::print_jvm_flags_on(outputStream* st) {
787 if (_num_jvm_flags > 0) {
788 for (int i=0; i < _num_jvm_flags; i++) {
789 st->print("%s ", _jvm_flags_array[i]);
790 }
791 st->print_cr("");
792 }
793 }
794
795 void Arguments::print_jvm_args_on(outputStream* st) {
796 if (_num_jvm_args > 0) {
797 for (int i=0; i < _num_jvm_args; i++) {
798 st->print("%s ", _jvm_args_array[i]);
799 }
800 st->print_cr("");
801 }
802 }
803
804 bool Arguments::process_argument(const char* arg,
805 jboolean ignore_unrecognized, FlagValueOrigin origin) {
806
807 JDK_Version since = JDK_Version();
808
809 if (parse_argument(arg, origin) || ignore_unrecognized) {
810 return true;
811 }
812
813 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg;
814 if (is_newly_obsolete(arg, &since)) {
815 char version[256];
816 since.to_string(version, sizeof(version));
817 warning("ignoring option %s; support was removed in %s", argname, version);
818 return true;
819 }
820
821 jio_fprintf(defaultStream::error_stream(),
822 "Unrecognized VM option '%s'\n", argname);
823 // allow for commandline "commenting out" options like -XX:#+Verbose
824 return arg[0] == '#';
825 }
826
827 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
828 FILE* stream = fopen(file_name, "rb");
829 if (stream == NULL) {
830 if (should_exist) {
831 jio_fprintf(defaultStream::error_stream(),
832 "Could not open settings file %s\n", file_name);
833 return false;
834 } else {
835 return true;
836 }
837 }
838
839 char token[1024];
840 int pos = 0;
841
842 bool in_white_space = true;
843 bool in_comment = false;
844 bool in_quote = false;
845 char quote_c = 0;
846 bool result = true;
847
848 int c = getc(stream);
849 while(c != EOF) {
850 if (in_white_space) {
851 if (in_comment) {
852 if (c == '\n') in_comment = false;
853 } else {
854 if (c == '#') in_comment = true;
855 else if (!isspace(c)) {
856 in_white_space = false;
857 token[pos++] = c;
858 }
859 }
860 } else {
861 if (c == '\n' || (!in_quote && isspace(c))) {
862 // token ends at newline, or at unquoted whitespace
863 // this allows a way to include spaces in string-valued options
864 token[pos] = '\0';
865 logOption(token);
866 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
867 build_jvm_flags(token);
868 pos = 0;
869 in_white_space = true;
870 in_quote = false;
871 } else if (!in_quote && (c == '\'' || c == '"')) {
872 in_quote = true;
873 quote_c = c;
874 } else if (in_quote && (c == quote_c)) {
875 in_quote = false;
876 } else {
877 token[pos++] = c;
878 }
879 }
880 c = getc(stream);
881 }
882 if (pos > 0) {
883 token[pos] = '\0';
884 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
885 build_jvm_flags(token);
886 }
887 fclose(stream);
888 return result;
889 }
890
891 //=============================================================================================================
892 // Parsing of properties (-D)
893
894 const char* Arguments::get_property(const char* key) {
895 return PropertyList_get_value(system_properties(), key);
896 }
897
898 bool Arguments::add_property(const char* prop) {
899 const char* eq = strchr(prop, '=');
900 char* key;
901 // ns must be static--its address may be stored in a SystemProperty object.
902 const static char ns[1] = {0};
903 char* value = (char *)ns;
904
905 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
906 key = AllocateHeap(key_len + 1, "add_property");
907 strncpy(key, prop, key_len);
908 key[key_len] = '\0';
909
910 if (eq != NULL) {
911 size_t value_len = strlen(prop) - key_len - 1;
912 value = AllocateHeap(value_len + 1, "add_property");
913 strncpy(value, &prop[key_len + 1], value_len + 1);
914 }
915
916 if (strcmp(key, "java.compiler") == 0) {
917 process_java_compiler_argument(value);
918 FreeHeap(key);
919 if (eq != NULL) {
920 FreeHeap(value);
921 }
922 return true;
923 } else if (strcmp(key, "sun.java.command") == 0) {
924 _java_command = value;
925
926 // Record value in Arguments, but let it get passed to Java.
927 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
928 // launcher.pid property is private and is processed
929 // in process_sun_java_launcher_properties();
930 // the sun.java.launcher property is passed on to the java application
931 FreeHeap(key);
932 if (eq != NULL) {
933 FreeHeap(value);
934 }
935 return true;
936 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
937 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
938 // its value without going through the property list or making a Java call.
939 _java_vendor_url_bug = value;
940 } else if (strcmp(key, "sun.boot.library.path") == 0) {
941 PropertyList_unique_add(&_system_properties, key, value, true);
942 return true;
943 }
944 // Create new property and add at the end of the list
945 PropertyList_unique_add(&_system_properties, key, value);
946 return true;
947 }
948
949 //===========================================================================================================
950 // Setting int/mixed/comp mode flags
951
952 void Arguments::set_mode_flags(Mode mode) {
953 // Set up default values for all flags.
954 // If you add a flag to any of the branches below,
955 // add a default value for it here.
956 set_java_compiler(false);
957 _mode = mode;
958
959 // Ensure Agent_OnLoad has the correct initial values.
960 // This may not be the final mode; mode may change later in onload phase.
961 PropertyList_unique_add(&_system_properties, "java.vm.info",
962 (char*)VM_Version::vm_info_string(), false);
963
964 UseInterpreter = true;
965 UseCompiler = true;
966 UseLoopCounter = true;
967
968 #ifndef ZERO
969 // Turn these off for mixed and comp. Leave them on for Zero.
970 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
971 UseFastAccessorMethods = (mode == _int);
972 }
973 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
974 UseFastEmptyMethods = (mode == _int);
975 }
976 #endif
977
978 // Default values may be platform/compiler dependent -
979 // use the saved values
980 ClipInlining = Arguments::_ClipInlining;
981 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
982 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
983 BackgroundCompilation = Arguments::_BackgroundCompilation;
984
985 // Change from defaults based on mode
986 switch (mode) {
987 default:
988 ShouldNotReachHere();
989 break;
990 case _int:
991 UseCompiler = false;
992 UseLoopCounter = false;
993 AlwaysCompileLoopMethods = false;
994 UseOnStackReplacement = false;
995 break;
996 case _mixed:
997 // same as default
998 break;
999 case _comp:
1000 UseInterpreter = false;
1001 BackgroundCompilation = false;
1002 ClipInlining = false;
1003 break;
1004 }
1005 }
1006
1007 // Conflict: required to use shared spaces (-Xshare:on), but
1008 // incompatible command line options were chosen.
1009
1010 static void no_shared_spaces() {
1011 if (RequireSharedSpaces) {
1012 jio_fprintf(defaultStream::error_stream(),
1013 "Class data sharing is inconsistent with other specified options.\n");
1014 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1015 } else {
1016 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1017 }
1018 }
1019
1020 void Arguments::set_tiered_flags() {
1021 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1022 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1023 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1024 }
1025 if (CompilationPolicyChoice < 2) {
1026 vm_exit_during_initialization(
1027 "Incompatible compilation policy selected", NULL);
1028 }
1029 // Increase the code cache size - tiered compiles a lot more.
1030 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1031 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1032 }
1033 }
1034
1035 #ifndef KERNEL
1036 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1037 // if it's not explictly set or unset. If the user has chosen
1038 // UseParNewGC and not explicitly set ParallelGCThreads we
1039 // set it, unless this is a single cpu machine.
1040 void Arguments::set_parnew_gc_flags() {
1041 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1042 "control point invariant");
1043 assert(UseParNewGC, "Error");
1044
1045 // Turn off AdaptiveSizePolicy by default for parnew until it is
1046 // complete.
1047 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1048 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1049 }
1050
1051 if (ParallelGCThreads == 0) {
1052 FLAG_SET_DEFAULT(ParallelGCThreads,
1053 Abstract_VM_Version::parallel_worker_threads());
1054 if (ParallelGCThreads == 1) {
1055 FLAG_SET_DEFAULT(UseParNewGC, false);
1056 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1057 }
1058 }
1059 if (UseParNewGC) {
1060 // CDS doesn't work with ParNew yet
1061 no_shared_spaces();
1062
1063 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1064 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1065 // we set them to 1024 and 1024.
1066 // See CR 6362902.
1067 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1068 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1069 }
1070 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1071 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1072 }
1073
1074 // AlwaysTenure flag should make ParNew promote all at first collection.
1075 // See CR 6362902.
1076 if (AlwaysTenure) {
1077 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
1078 }
1079 // When using compressed oops, we use local overflow stacks,
1080 // rather than using a global overflow list chained through
1081 // the klass word of the object's pre-image.
1082 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1083 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1084 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1085 }
1086 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1087 }
1088 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1089 }
1090 }
1091
1092 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1093 // sparc/solaris for certain applications, but would gain from
1094 // further optimization and tuning efforts, and would almost
1095 // certainly gain from analysis of platform and environment.
1096 void Arguments::set_cms_and_parnew_gc_flags() {
1097 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1098 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1099
1100 // If we are using CMS, we prefer to UseParNewGC,
1101 // unless explicitly forbidden.
1102 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1103 FLAG_SET_ERGO(bool, UseParNewGC, true);
1104 }
1105
1106 // Turn off AdaptiveSizePolicy by default for cms until it is
1107 // complete.
1108 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1109 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1110 }
1111
1112 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1113 // as needed.
1114 if (UseParNewGC) {
1115 set_parnew_gc_flags();
1116 }
1117
1118 // MaxHeapSize is aligned down in collectorPolicy
1119 size_t max_heap = align_size_down(MaxHeapSize,
1120 CardTableRS::ct_max_alignment_constraint());
1121
1122 // Now make adjustments for CMS
1123 intx tenuring_default = (intx)6;
1124 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1125
1126 // Preferred young gen size for "short" pauses:
1127 // upper bound depends on # of threads and NewRatio.
1128 const uintx parallel_gc_threads =
1129 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1130 const size_t preferred_max_new_size_unaligned =
1131 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1132 size_t preferred_max_new_size =
1133 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1134
1135 // Unless explicitly requested otherwise, size young gen
1136 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1137
1138 // If either MaxNewSize or NewRatio is set on the command line,
1139 // assume the user is trying to set the size of the young gen.
1140 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1141
1142 // Set MaxNewSize to our calculated preferred_max_new_size unless
1143 // NewSize was set on the command line and it is larger than
1144 // preferred_max_new_size.
1145 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1146 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1147 } else {
1148 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1149 }
1150 if (PrintGCDetails && Verbose) {
1151 // Too early to use gclog_or_tty
1152 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1153 }
1154
1155 // Code along this path potentially sets NewSize and OldSize
1156
1157 assert(max_heap >= InitialHeapSize, "Error");
1158 assert(max_heap >= NewSize, "Error");
1159
1160 if (PrintGCDetails && Verbose) {
1161 // Too early to use gclog_or_tty
1162 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1163 " initial_heap_size: " SIZE_FORMAT
1164 " max_heap: " SIZE_FORMAT,
1165 min_heap_size(), InitialHeapSize, max_heap);
1166 }
1167 size_t min_new = preferred_max_new_size;
1168 if (FLAG_IS_CMDLINE(NewSize)) {
1169 min_new = NewSize;
1170 }
1171 if (max_heap > min_new && min_heap_size() > min_new) {
1172 // Unless explicitly requested otherwise, make young gen
1173 // at least min_new, and at most preferred_max_new_size.
1174 if (FLAG_IS_DEFAULT(NewSize)) {
1175 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1176 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1177 if (PrintGCDetails && Verbose) {
1178 // Too early to use gclog_or_tty
1179 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1180 }
1181 }
1182 // Unless explicitly requested otherwise, size old gen
1183 // so it's NewRatio x of NewSize.
1184 if (FLAG_IS_DEFAULT(OldSize)) {
1185 if (max_heap > NewSize) {
1186 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1187 if (PrintGCDetails && Verbose) {
1188 // Too early to use gclog_or_tty
1189 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1190 }
1191 }
1192 }
1193 }
1194 }
1195 // Unless explicitly requested otherwise, definitely
1196 // promote all objects surviving "tenuring_default" scavenges.
1197 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1198 FLAG_IS_DEFAULT(SurvivorRatio)) {
1199 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1200 }
1201 // If we decided above (or user explicitly requested)
1202 // `promote all' (via MaxTenuringThreshold := 0),
1203 // prefer minuscule survivor spaces so as not to waste
1204 // space for (non-existent) survivors
1205 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1206 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1207 }
1208 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1209 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1210 // This is done in order to make ParNew+CMS configuration to work
1211 // with YoungPLABSize and OldPLABSize options.
1212 // See CR 6362902.
1213 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1214 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1215 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1216 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1217 // the value (either from the command line or ergonomics) of
1218 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1219 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1220 } else {
1221 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1222 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1223 // we'll let it to take precedence.
1224 jio_fprintf(defaultStream::error_stream(),
1225 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1226 " options are specified for the CMS collector."
1227 " CMSParPromoteBlocksToClaim will take precedence.\n");
1228 }
1229 }
1230 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1231 // OldPLAB sizing manually turned off: Use a larger default setting,
1232 // unless it was manually specified. This is because a too-low value
1233 // will slow down scavenges.
1234 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1235 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1236 }
1237 }
1238 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1239 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1240 // If either of the static initialization defaults have changed, note this
1241 // modification.
1242 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1243 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1244 }
1245 if (PrintGCDetails && Verbose) {
1246 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1247 MarkStackSize / K, MarkStackSizeMax / K);
1248 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1249 }
1250 }
1251 #endif // KERNEL
1252
1253 void set_object_alignment() {
1254 // Object alignment.
1255 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1256 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1257 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1258 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1259 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1260 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1261
1262 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1263 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1264
1265 // Oop encoding heap max
1266 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1267
1268 #ifndef KERNEL
1269 // Set CMS global values
1270 CompactibleFreeListSpace::set_cms_values();
1271 #endif // KERNEL
1272 }
1273
1274 bool verify_object_alignment() {
1275 // Object alignment.
1276 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1277 jio_fprintf(defaultStream::error_stream(),
1278 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1279 (int)ObjectAlignmentInBytes);
1280 return false;
1281 }
1282 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1283 jio_fprintf(defaultStream::error_stream(),
1284 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1285 (int)ObjectAlignmentInBytes, BytesPerLong);
1286 return false;
1287 }
1288 // It does not make sense to have big object alignment
1289 // since a space lost due to alignment will be greater
1290 // then a saved space from compressed oops.
1291 if ((int)ObjectAlignmentInBytes > 256) {
1292 jio_fprintf(defaultStream::error_stream(),
1293 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1294 (int)ObjectAlignmentInBytes);
1295 return false;
1296 }
1297 // In case page size is very small.
1298 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1299 jio_fprintf(defaultStream::error_stream(),
1300 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1301 (int)ObjectAlignmentInBytes, os::vm_page_size());
1302 return false;
1303 }
1304 return true;
1305 }
1306
1307 inline uintx max_heap_for_compressed_oops() {
1308 // Avoid sign flip.
1309 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) {
1310 return 0;
1311 }
1312 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1313 NOT_LP64(ShouldNotReachHere(); return 0);
1314 }
1315
1316 bool Arguments::should_auto_select_low_pause_collector() {
1317 if (UseAutoGCSelectPolicy &&
1318 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1319 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1320 if (PrintGCDetails) {
1321 // Cannot use gclog_or_tty yet.
1322 tty->print_cr("Automatic selection of the low pause collector"
1323 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1324 }
1325 return true;
1326 }
1327 return false;
1328 }
1329
1330 void Arguments::set_ergonomics_flags() {
1331 // Parallel GC is not compatible with sharing. If one specifies
1332 // that they want sharing explicitly, do not set ergonomics flags.
1333 if (DumpSharedSpaces || RequireSharedSpaces) {
1334 return;
1335 }
1336
1337 if (os::is_server_class_machine() && !force_client_mode ) {
1338 // If no other collector is requested explicitly,
1339 // let the VM select the collector based on
1340 // machine class and automatic selection policy.
1341 if (!UseSerialGC &&
1342 !UseConcMarkSweepGC &&
1343 !UseG1GC &&
1344 !UseParNewGC &&
1345 !DumpSharedSpaces &&
1346 FLAG_IS_DEFAULT(UseParallelGC)) {
1347 if (should_auto_select_low_pause_collector()) {
1348 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1349 } else {
1350 FLAG_SET_ERGO(bool, UseParallelGC, true);
1351 }
1352 no_shared_spaces();
1353 }
1354 }
1355
1356 #ifndef ZERO
1357 #ifdef _LP64
1358 // Check that UseCompressedOops can be set with the max heap size allocated
1359 // by ergonomics.
1360 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1361 #if !defined(COMPILER1) || defined(TIERED)
1362 // disable UseCompressedOops by default on MacOS X until 7118647 is fixed
1363 #ifndef __APPLE__
1364 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1365 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1366 }
1367 #endif // !__APPLE__
1368 #endif
1369 #ifdef _WIN64
1370 if (UseLargePages && UseCompressedOops) {
1371 // Cannot allocate guard pages for implicit checks in indexed addressing
1372 // mode, when large pages are specified on windows.
1373 // This flag could be switched ON if narrow oop base address is set to 0,
1374 // see code in Universe::initialize_heap().
1375 Universe::set_narrow_oop_use_implicit_null_checks(false);
1376 }
1377 #endif // _WIN64
1378 } else {
1379 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1380 warning("Max heap size too large for Compressed Oops");
1381 FLAG_SET_DEFAULT(UseCompressedOops, false);
1382 }
1383 }
1384 // Also checks that certain machines are slower with compressed oops
1385 // in vm_version initialization code.
1386 #endif // _LP64
1387 #endif // !ZERO
1388 }
1389
1390 void Arguments::set_parallel_gc_flags() {
1391 assert(UseParallelGC || UseParallelOldGC, "Error");
1392 // If parallel old was requested, automatically enable parallel scavenge.
1393 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1394 FLAG_SET_DEFAULT(UseParallelGC, true);
1395 }
1396
1397 // If no heap maximum was requested explicitly, use some reasonable fraction
1398 // of the physical memory, up to a maximum of 1GB.
1399 if (UseParallelGC) {
1400 FLAG_SET_DEFAULT(ParallelGCThreads,
1401 Abstract_VM_Version::parallel_worker_threads());
1402
1403 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1404 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1405 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1406 // See CR 6362902 for details.
1407 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1408 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1409 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1410 }
1411 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1412 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1413 }
1414 }
1415
1416 if (UseParallelOldGC) {
1417 // Par compact uses lower default values since they are treated as
1418 // minimums. These are different defaults because of the different
1419 // interpretation and are not ergonomically set.
1420 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1421 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1422 }
1423 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1424 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1425 }
1426 }
1427 }
1428 if (UseNUMA) {
1429 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
1430 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
1431 }
1432 // For those collectors or operating systems (eg, Windows) that do
1433 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
1434 UseNUMAInterleaving = true;
1435 }
1436 }
1437
1438 void Arguments::set_g1_gc_flags() {
1439 assert(UseG1GC, "Error");
1440 #ifdef COMPILER1
1441 FastTLABRefill = false;
1442 #endif
1443 FLAG_SET_DEFAULT(ParallelGCThreads,
1444 Abstract_VM_Version::parallel_worker_threads());
1445 if (ParallelGCThreads == 0) {
1446 FLAG_SET_DEFAULT(ParallelGCThreads,
1447 Abstract_VM_Version::parallel_worker_threads());
1448 }
1449 no_shared_spaces();
1450
1451 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1452 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1453 }
1454 if (PrintGCDetails && Verbose) {
1455 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1456 MarkStackSize / K, MarkStackSizeMax / K);
1457 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1458 }
1459
1460 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1461 // In G1, we want the default GC overhead goal to be higher than
1462 // say in PS. So we set it here to 10%. Otherwise the heap might
1463 // be expanded more aggressively than we would like it to. In
1464 // fact, even 10% seems to not be high enough in some cases
1465 // (especially small GC stress tests that the main thing they do
1466 // is allocation). We might consider increase it further.
1467 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1468 }
1469 }
1470
1471 void Arguments::set_heap_size() {
1472 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1473 // Deprecated flag
1474 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1475 }
1476
1477 const julong phys_mem =
1478 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1479 : (julong)MaxRAM;
1480
1481 // If the maximum heap size has not been set with -Xmx,
1482 // then set it as fraction of the size of physical memory,
1483 // respecting the maximum and minimum sizes of the heap.
1484 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1485 julong reasonable_max = phys_mem / MaxRAMFraction;
1486
1487 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1488 // Small physical memory, so use a minimum fraction of it for the heap
1489 reasonable_max = phys_mem / MinRAMFraction;
1490 } else {
1491 // Not-small physical memory, so require a heap at least
1492 // as large as MaxHeapSize
1493 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1494 }
1495 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1496 // Limit the heap size to ErgoHeapSizeLimit
1497 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1498 }
1499 if (UseCompressedOops) {
1500 // Limit the heap size to the maximum possible when using compressed oops
1501 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1502 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1503 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1504 // but it should be not less than default MaxHeapSize.
1505 max_coop_heap -= HeapBaseMinAddress;
1506 }
1507 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1508 }
1509 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1510
1511 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1512 // An initial heap size was specified on the command line,
1513 // so be sure that the maximum size is consistent. Done
1514 // after call to allocatable_physical_memory because that
1515 // method might reduce the allocation size.
1516 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1517 }
1518
1519 if (PrintGCDetails && Verbose) {
1520 // Cannot use gclog_or_tty yet.
1521 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1522 }
1523 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1524 }
1525
1526 // If the initial_heap_size has not been set with InitialHeapSize
1527 // or -Xms, then set it as fraction of the size of physical memory,
1528 // respecting the maximum and minimum sizes of the heap.
1529 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1530 julong reasonable_minimum = (julong)(OldSize + NewSize);
1531
1532 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1533
1534 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1535
1536 julong reasonable_initial = phys_mem / InitialRAMFraction;
1537
1538 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1539 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1540
1541 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1542
1543 if (PrintGCDetails && Verbose) {
1544 // Cannot use gclog_or_tty yet.
1545 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1546 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1547 }
1548 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1549 set_min_heap_size((uintx)reasonable_minimum);
1550 }
1551 }
1552
1553 // This must be called after ergonomics because we want bytecode rewriting
1554 // if the server compiler is used, or if UseSharedSpaces is disabled.
1555 void Arguments::set_bytecode_flags() {
1556 // Better not attempt to store into a read-only space.
1557 if (UseSharedSpaces) {
1558 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1559 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1560 }
1561
1562 if (!RewriteBytecodes) {
1563 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1564 }
1565 }
1566
1567 // Aggressive optimization flags -XX:+AggressiveOpts
1568 void Arguments::set_aggressive_opts_flags() {
1569 #ifdef COMPILER2
1570 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1571 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1572 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1573 }
1574 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1575 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1576 }
1577
1578 // Feed the cache size setting into the JDK
1579 char buffer[1024];
1580 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1581 add_property(buffer);
1582 }
1583 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1584 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1585 }
1586 #endif
1587
1588 if (AggressiveOpts) {
1589 // Sample flag setting code
1590 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1591 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1592 // }
1593 }
1594 }
1595
1596 //===========================================================================================================
1597 // Parsing of java.compiler property
1598
1599 void Arguments::process_java_compiler_argument(char* arg) {
1600 // For backwards compatibility, Djava.compiler=NONE or ""
1601 // causes us to switch to -Xint mode UNLESS -Xdebug
1602 // is also specified.
1603 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1604 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1605 }
1606 }
1607
1608 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1609 _sun_java_launcher = strdup(launcher);
1610 if (strcmp("gamma", _sun_java_launcher) == 0) {
1611 _created_by_gamma_launcher = true;
1612 }
1613 }
1614
1615 bool Arguments::created_by_java_launcher() {
1616 assert(_sun_java_launcher != NULL, "property must have value");
1617 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1618 }
1619
1620 bool Arguments::created_by_gamma_launcher() {
1621 return _created_by_gamma_launcher;
1622 }
1623
1624 //===========================================================================================================
1625 // Parsing of main arguments
1626
1627 bool Arguments::verify_interval(uintx val, uintx min,
1628 uintx max, const char* name) {
1629 // Returns true iff value is in the inclusive interval [min..max]
1630 // false, otherwise.
1631 if (val >= min && val <= max) {
1632 return true;
1633 }
1634 jio_fprintf(defaultStream::error_stream(),
1635 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1636 " and " UINTX_FORMAT "\n",
1637 name, val, min, max);
1638 return false;
1639 }
1640
1641 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1642 // Returns true if given value is at least specified min threshold
1643 // false, otherwise.
1644 if (val >= min ) {
1645 return true;
1646 }
1647 jio_fprintf(defaultStream::error_stream(),
1648 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1649 name, val, min);
1650 return false;
1651 }
1652
1653 bool Arguments::verify_percentage(uintx value, const char* name) {
1654 if (value <= 100) {
1655 return true;
1656 }
1657 jio_fprintf(defaultStream::error_stream(),
1658 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1659 name, value);
1660 return false;
1661 }
1662
1663 static void force_serial_gc() {
1664 FLAG_SET_DEFAULT(UseSerialGC, true);
1665 FLAG_SET_DEFAULT(UseParNewGC, false);
1666 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1667 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1668 FLAG_SET_DEFAULT(UseParallelGC, false);
1669 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1670 FLAG_SET_DEFAULT(UseG1GC, false);
1671 }
1672
1673 static bool verify_serial_gc_flags() {
1674 return (UseSerialGC &&
1675 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1676 UseParallelGC || UseParallelOldGC));
1677 }
1678
1679 // check if do gclog rotation
1680 // +UseGCLogFileRotation is a must,
1681 // no gc log rotation when log file not supplied or
1682 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1683 void check_gclog_consistency() {
1684 if (UseGCLogFileRotation) {
1685 if ((Arguments::gc_log_filename() == NULL) ||
1686 (NumberOfGCLogFiles == 0) ||
1687 (GCLogFileSize == 0)) {
1688 jio_fprintf(defaultStream::output_stream(),
1689 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1690 "where num_of_file > 0 and num_of_size > 0\n"
1691 "GC log rotation is turned off\n");
1692 UseGCLogFileRotation = false;
1693 }
1694 }
1695
1696 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1697 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1698 jio_fprintf(defaultStream::output_stream(),
1699 "GCLogFileSize changed to minimum 8K\n");
1700 }
1701 }
1702
1703 // Check consistency of GC selection
1704 bool Arguments::check_gc_consistency() {
1705 check_gclog_consistency();
1706 bool status = true;
1707 // Ensure that the user has not selected conflicting sets
1708 // of collectors. [Note: this check is merely a user convenience;
1709 // collectors over-ride each other so that only a non-conflicting
1710 // set is selected; however what the user gets is not what they
1711 // may have expected from the combination they asked for. It's
1712 // better to reduce user confusion by not allowing them to
1713 // select conflicting combinations.
1714 uint i = 0;
1715 if (UseSerialGC) i++;
1716 if (UseConcMarkSweepGC || UseParNewGC) i++;
1717 if (UseParallelGC || UseParallelOldGC) i++;
1718 if (UseG1GC) i++;
1719 if (i > 1) {
1720 jio_fprintf(defaultStream::error_stream(),
1721 "Conflicting collector combinations in option list; "
1722 "please refer to the release notes for the combinations "
1723 "allowed\n");
1724 status = false;
1725 }
1726
1727 return status;
1728 }
1729
1730 // Check stack pages settings
1731 bool Arguments::check_stack_pages()
1732 {
1733 bool status = true;
1734 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1735 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1736 // greater stack shadow pages can't generate instruction to bang stack
1737 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1738 return status;
1739 }
1740
1741 // Check the consistency of vm_init_args
1742 bool Arguments::check_vm_args_consistency() {
1743 // Method for adding checks for flag consistency.
1744 // The intent is to warn the user of all possible conflicts,
1745 // before returning an error.
1746 // Note: Needs platform-dependent factoring.
1747 bool status = true;
1748
1749 #if ( (defined(COMPILER2) && defined(SPARC)))
1750 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1751 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1752 // x86. Normally, VM_Version_init must be called from init_globals in
1753 // init.cpp, which is called by the initial java thread *after* arguments
1754 // have been parsed. VM_Version_init gets called twice on sparc.
1755 extern void VM_Version_init();
1756 VM_Version_init();
1757 if (!VM_Version::has_v9()) {
1758 jio_fprintf(defaultStream::error_stream(),
1759 "V8 Machine detected, Server requires V9\n");
1760 status = false;
1761 }
1762 #endif /* COMPILER2 && SPARC */
1763
1764 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1765 // builds so the cost of stack banging can be measured.
1766 #if (defined(PRODUCT) && defined(SOLARIS))
1767 if (!UseBoundThreads && !UseStackBanging) {
1768 jio_fprintf(defaultStream::error_stream(),
1769 "-UseStackBanging conflicts with -UseBoundThreads\n");
1770
1771 status = false;
1772 }
1773 #endif
1774
1775 if (TLABRefillWasteFraction == 0) {
1776 jio_fprintf(defaultStream::error_stream(),
1777 "TLABRefillWasteFraction should be a denominator, "
1778 "not " SIZE_FORMAT "\n",
1779 TLABRefillWasteFraction);
1780 status = false;
1781 }
1782
1783 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1784 "AdaptiveSizePolicyWeight");
1785 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1786 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1787 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1788 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1789
1790 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1791 jio_fprintf(defaultStream::error_stream(),
1792 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1793 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1794 MinHeapFreeRatio, MaxHeapFreeRatio);
1795 status = false;
1796 }
1797 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1798 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1799
1800 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1801 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1802 }
1803
1804 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1805 // Settings to encourage splitting.
1806 if (!FLAG_IS_CMDLINE(NewRatio)) {
1807 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1808 }
1809 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1810 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1811 }
1812 }
1813
1814 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1815 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1816 if (GCTimeLimit == 100) {
1817 // Turn off gc-overhead-limit-exceeded checks
1818 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1819 }
1820
1821 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1822
1823 status = status && check_gc_consistency();
1824 status = status && check_stack_pages();
1825
1826 if (_has_alloc_profile) {
1827 if (UseParallelGC || UseParallelOldGC) {
1828 jio_fprintf(defaultStream::error_stream(),
1829 "error: invalid argument combination.\n"
1830 "Allocation profiling (-Xaprof) cannot be used together with "
1831 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1832 status = false;
1833 }
1834 if (UseConcMarkSweepGC) {
1835 jio_fprintf(defaultStream::error_stream(),
1836 "error: invalid argument combination.\n"
1837 "Allocation profiling (-Xaprof) cannot be used together with "
1838 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1839 status = false;
1840 }
1841 }
1842
1843 if (CMSIncrementalMode) {
1844 if (!UseConcMarkSweepGC) {
1845 jio_fprintf(defaultStream::error_stream(),
1846 "error: invalid argument combination.\n"
1847 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1848 "selected in order\nto use CMSIncrementalMode.\n");
1849 status = false;
1850 } else {
1851 status = status && verify_percentage(CMSIncrementalDutyCycle,
1852 "CMSIncrementalDutyCycle");
1853 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1854 "CMSIncrementalDutyCycleMin");
1855 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1856 "CMSIncrementalSafetyFactor");
1857 status = status && verify_percentage(CMSIncrementalOffset,
1858 "CMSIncrementalOffset");
1859 status = status && verify_percentage(CMSExpAvgFactor,
1860 "CMSExpAvgFactor");
1861 // If it was not set on the command line, set
1862 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1863 if (CMSInitiatingOccupancyFraction < 0) {
1864 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1865 }
1866 }
1867 }
1868
1869 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1870 // insists that we hold the requisite locks so that the iteration is
1871 // MT-safe. For the verification at start-up and shut-down, we don't
1872 // yet have a good way of acquiring and releasing these locks,
1873 // which are not visible at the CollectedHeap level. We want to
1874 // be able to acquire these locks and then do the iteration rather
1875 // than just disable the lock verification. This will be fixed under
1876 // bug 4788986.
1877 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1878 if (VerifyGCStartAt == 0) {
1879 warning("Heap verification at start-up disabled "
1880 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1881 VerifyGCStartAt = 1; // Disable verification at start-up
1882 }
1883 if (VerifyBeforeExit) {
1884 warning("Heap verification at shutdown disabled "
1885 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1886 VerifyBeforeExit = false; // Disable verification at shutdown
1887 }
1888 }
1889
1890 // Note: only executed in non-PRODUCT mode
1891 if (!UseAsyncConcMarkSweepGC &&
1892 (ExplicitGCInvokesConcurrent ||
1893 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1894 jio_fprintf(defaultStream::error_stream(),
1895 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1896 " with -UseAsyncConcMarkSweepGC");
1897 status = false;
1898 }
1899
1900 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
1901
1902 #ifndef SERIALGC
1903 if (UseG1GC) {
1904 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1905 "InitiatingHeapOccupancyPercent");
1906 status = status && verify_min_value(G1RefProcDrainInterval, 1,
1907 "G1RefProcDrainInterval");
1908 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
1909 "G1ConcMarkStepDurationMillis");
1910 }
1911 #endif
1912
1913 status = status && verify_interval(RefDiscoveryPolicy,
1914 ReferenceProcessor::DiscoveryPolicyMin,
1915 ReferenceProcessor::DiscoveryPolicyMax,
1916 "RefDiscoveryPolicy");
1917
1918 // Limit the lower bound of this flag to 1 as it is used in a division
1919 // expression.
1920 status = status && verify_interval(TLABWasteTargetPercent,
1921 1, 100, "TLABWasteTargetPercent");
1922
1923 status = status && verify_object_alignment();
1924
1925 return status;
1926 }
1927
1928 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1929 const char* option_type) {
1930 if (ignore) return false;
1931
1932 const char* spacer = " ";
1933 if (option_type == NULL) {
1934 option_type = ++spacer; // Set both to the empty string.
1935 }
1936
1937 if (os::obsolete_option(option)) {
1938 jio_fprintf(defaultStream::error_stream(),
1939 "Obsolete %s%soption: %s\n", option_type, spacer,
1940 option->optionString);
1941 return false;
1942 } else {
1943 jio_fprintf(defaultStream::error_stream(),
1944 "Unrecognized %s%soption: %s\n", option_type, spacer,
1945 option->optionString);
1946 return true;
1947 }
1948 }
1949
1950 static const char* user_assertion_options[] = {
1951 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1952 };
1953
1954 static const char* system_assertion_options[] = {
1955 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1956 };
1957
1958 // Return true if any of the strings in null-terminated array 'names' matches.
1959 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1960 // the option must match exactly.
1961 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1962 bool tail_allowed) {
1963 for (/* empty */; *names != NULL; ++names) {
1964 if (match_option(option, *names, tail)) {
1965 if (**tail == '\0' || tail_allowed && **tail == ':') {
1966 return true;
1967 }
1968 }
1969 }
1970 return false;
1971 }
1972
1973 bool Arguments::parse_uintx(const char* value,
1974 uintx* uintx_arg,
1975 uintx min_size) {
1976
1977 // Check the sign first since atomull() parses only unsigned values.
1978 bool value_is_positive = !(*value == '-');
1979
1980 if (value_is_positive) {
1981 julong n;
1982 bool good_return = atomull(value, &n);
1983 if (good_return) {
1984 bool above_minimum = n >= min_size;
1985 bool value_is_too_large = n > max_uintx;
1986
1987 if (above_minimum && !value_is_too_large) {
1988 *uintx_arg = n;
1989 return true;
1990 }
1991 }
1992 }
1993 return false;
1994 }
1995
1996 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
1997 julong* long_arg,
1998 julong min_size) {
1999 if (!atomull(s, long_arg)) return arg_unreadable;
2000 return check_memory_size(*long_arg, min_size);
2001 }
2002
2003 // Parse JavaVMInitArgs structure
2004
2005 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2006 // For components of the system classpath.
2007 SysClassPath scp(Arguments::get_sysclasspath());
2008 bool scp_assembly_required = false;
2009
2010 // Save default settings for some mode flags
2011 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2012 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2013 Arguments::_ClipInlining = ClipInlining;
2014 Arguments::_BackgroundCompilation = BackgroundCompilation;
2015
2016 // Setup flags for mixed which is the default
2017 set_mode_flags(_mixed);
2018
2019 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2020 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2021 if (result != JNI_OK) {
2022 return result;
2023 }
2024
2025 // Parse JavaVMInitArgs structure passed in
2026 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2027 if (result != JNI_OK) {
2028 return result;
2029 }
2030
2031 if (AggressiveOpts) {
2032 // Insert alt-rt.jar between user-specified bootclasspath
2033 // prefix and the default bootclasspath. os::set_boot_path()
2034 // uses meta_index_dir as the default bootclasspath directory.
2035 const char* altclasses_jar = "alt-rt.jar";
2036 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2037 strlen(altclasses_jar);
2038 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
2039 strcpy(altclasses_path, get_meta_index_dir());
2040 strcat(altclasses_path, altclasses_jar);
2041 scp.add_suffix_to_prefix(altclasses_path);
2042 scp_assembly_required = true;
2043 FREE_C_HEAP_ARRAY(char, altclasses_path);
2044 }
2045
2046 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2047 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2048 if (result != JNI_OK) {
2049 return result;
2050 }
2051
2052 // Do final processing now that all arguments have been parsed
2053 result = finalize_vm_init_args(&scp, scp_assembly_required);
2054 if (result != JNI_OK) {
2055 return result;
2056 }
2057
2058 return JNI_OK;
2059 }
2060
2061 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2062 SysClassPath* scp_p,
2063 bool* scp_assembly_required_p,
2064 FlagValueOrigin origin) {
2065 // Remaining part of option string
2066 const char* tail;
2067
2068 // iterate over arguments
2069 for (int index = 0; index < args->nOptions; index++) {
2070 bool is_absolute_path = false; // for -agentpath vs -agentlib
2071
2072 const JavaVMOption* option = args->options + index;
2073
2074 if (!match_option(option, "-Djava.class.path", &tail) &&
2075 !match_option(option, "-Dsun.java.command", &tail) &&
2076 !match_option(option, "-Dsun.java.launcher", &tail)) {
2077
2078 // add all jvm options to the jvm_args string. This string
2079 // is used later to set the java.vm.args PerfData string constant.
2080 // the -Djava.class.path and the -Dsun.java.command options are
2081 // omitted from jvm_args string as each have their own PerfData
2082 // string constant object.
2083 build_jvm_args(option->optionString);
2084 }
2085
2086 // -verbose:[class/gc/jni]
2087 if (match_option(option, "-verbose", &tail)) {
2088 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2089 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2090 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2091 } else if (!strcmp(tail, ":gc")) {
2092 FLAG_SET_CMDLINE(bool, PrintGC, true);
2093 } else if (!strcmp(tail, ":jni")) {
2094 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2095 }
2096 // -da / -ea / -disableassertions / -enableassertions
2097 // These accept an optional class/package name separated by a colon, e.g.,
2098 // -da:java.lang.Thread.
2099 } else if (match_option(option, user_assertion_options, &tail, true)) {
2100 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2101 if (*tail == '\0') {
2102 JavaAssertions::setUserClassDefault(enable);
2103 } else {
2104 assert(*tail == ':', "bogus match by match_option()");
2105 JavaAssertions::addOption(tail + 1, enable);
2106 }
2107 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2108 } else if (match_option(option, system_assertion_options, &tail, false)) {
2109 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2110 JavaAssertions::setSystemClassDefault(enable);
2111 // -bootclasspath:
2112 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2113 scp_p->reset_path(tail);
2114 *scp_assembly_required_p = true;
2115 // -bootclasspath/a:
2116 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2117 scp_p->add_suffix(tail);
2118 *scp_assembly_required_p = true;
2119 // -bootclasspath/p:
2120 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2121 scp_p->add_prefix(tail);
2122 *scp_assembly_required_p = true;
2123 // -Xrun
2124 } else if (match_option(option, "-Xrun", &tail)) {
2125 if (tail != NULL) {
2126 const char* pos = strchr(tail, ':');
2127 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2128 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2129 name[len] = '\0';
2130
2131 char *options = NULL;
2132 if(pos != NULL) {
2133 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2134 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2135 }
2136 #ifdef JVMTI_KERNEL
2137 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2138 warning("profiling and debugging agents are not supported with Kernel VM");
2139 } else
2140 #endif // JVMTI_KERNEL
2141 add_init_library(name, options);
2142 }
2143 // -agentlib and -agentpath
2144 } else if (match_option(option, "-agentlib:", &tail) ||
2145 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2146 if(tail != NULL) {
2147 const char* pos = strchr(tail, '=');
2148 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2149 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2150 name[len] = '\0';
2151
2152 char *options = NULL;
2153 if(pos != NULL) {
2154 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2155 }
2156 #ifdef JVMTI_KERNEL
2157 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2158 warning("profiling and debugging agents are not supported with Kernel VM");
2159 } else
2160 #endif // JVMTI_KERNEL
2161 add_init_agent(name, options, is_absolute_path);
2162
2163 }
2164 // -javaagent
2165 } else if (match_option(option, "-javaagent:", &tail)) {
2166 if(tail != NULL) {
2167 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2168 add_init_agent("instrument", options, false);
2169 }
2170 // -Xnoclassgc
2171 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2172 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2173 // -Xincgc: i-CMS
2174 } else if (match_option(option, "-Xincgc", &tail)) {
2175 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2176 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2177 // -Xnoincgc: no i-CMS
2178 } else if (match_option(option, "-Xnoincgc", &tail)) {
2179 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2180 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2181 // -Xconcgc
2182 } else if (match_option(option, "-Xconcgc", &tail)) {
2183 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2184 // -Xnoconcgc
2185 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2186 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2187 // -Xbatch
2188 } else if (match_option(option, "-Xbatch", &tail)) {
2189 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2190 // -Xmn for compatibility with other JVM vendors
2191 } else if (match_option(option, "-Xmn", &tail)) {
2192 julong long_initial_eden_size = 0;
2193 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2194 if (errcode != arg_in_range) {
2195 jio_fprintf(defaultStream::error_stream(),
2196 "Invalid initial eden size: %s\n", option->optionString);
2197 describe_range_error(errcode);
2198 return JNI_EINVAL;
2199 }
2200 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2201 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2202 // -Xms
2203 } else if (match_option(option, "-Xms", &tail)) {
2204 julong long_initial_heap_size = 0;
2205 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2206 if (errcode != arg_in_range) {
2207 jio_fprintf(defaultStream::error_stream(),
2208 "Invalid initial heap size: %s\n", option->optionString);
2209 describe_range_error(errcode);
2210 return JNI_EINVAL;
2211 }
2212 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2213 // Currently the minimum size and the initial heap sizes are the same.
2214 set_min_heap_size(InitialHeapSize);
2215 // -Xmx
2216 } else if (match_option(option, "-Xmx", &tail)) {
2217 julong long_max_heap_size = 0;
2218 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2219 if (errcode != arg_in_range) {
2220 jio_fprintf(defaultStream::error_stream(),
2221 "Invalid maximum heap size: %s\n", option->optionString);
2222 describe_range_error(errcode);
2223 return JNI_EINVAL;
2224 }
2225 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2226 // Xmaxf
2227 } else if (match_option(option, "-Xmaxf", &tail)) {
2228 int maxf = (int)(atof(tail) * 100);
2229 if (maxf < 0 || maxf > 100) {
2230 jio_fprintf(defaultStream::error_stream(),
2231 "Bad max heap free percentage size: %s\n",
2232 option->optionString);
2233 return JNI_EINVAL;
2234 } else {
2235 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2236 }
2237 // Xminf
2238 } else if (match_option(option, "-Xminf", &tail)) {
2239 int minf = (int)(atof(tail) * 100);
2240 if (minf < 0 || minf > 100) {
2241 jio_fprintf(defaultStream::error_stream(),
2242 "Bad min heap free percentage size: %s\n",
2243 option->optionString);
2244 return JNI_EINVAL;
2245 } else {
2246 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2247 }
2248 // -Xss
2249 } else if (match_option(option, "-Xss", &tail)) {
2250 julong long_ThreadStackSize = 0;
2251 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2252 if (errcode != arg_in_range) {
2253 jio_fprintf(defaultStream::error_stream(),
2254 "Invalid thread stack size: %s\n", option->optionString);
2255 describe_range_error(errcode);
2256 return JNI_EINVAL;
2257 }
2258 // Internally track ThreadStackSize in units of 1024 bytes.
2259 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2260 round_to((int)long_ThreadStackSize, K) / K);
2261 // -Xoss
2262 } else if (match_option(option, "-Xoss", &tail)) {
2263 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2264 // -Xmaxjitcodesize
2265 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2266 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2267 julong long_ReservedCodeCacheSize = 0;
2268 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2269 (size_t)InitialCodeCacheSize);
2270 if (errcode != arg_in_range) {
2271 jio_fprintf(defaultStream::error_stream(),
2272 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2273 option->optionString, InitialCodeCacheSize/K);
2274 describe_range_error(errcode);
2275 return JNI_EINVAL;
2276 }
2277 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2278 // -green
2279 } else if (match_option(option, "-green", &tail)) {
2280 jio_fprintf(defaultStream::error_stream(),
2281 "Green threads support not available\n");
2282 return JNI_EINVAL;
2283 // -native
2284 } else if (match_option(option, "-native", &tail)) {
2285 // HotSpot always uses native threads, ignore silently for compatibility
2286 // -Xsqnopause
2287 } else if (match_option(option, "-Xsqnopause", &tail)) {
2288 // EVM option, ignore silently for compatibility
2289 // -Xrs
2290 } else if (match_option(option, "-Xrs", &tail)) {
2291 // Classic/EVM option, new functionality
2292 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2293 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2294 // change default internal VM signals used - lower case for back compat
2295 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2296 // -Xoptimize
2297 } else if (match_option(option, "-Xoptimize", &tail)) {
2298 // EVM option, ignore silently for compatibility
2299 // -Xprof
2300 } else if (match_option(option, "-Xprof", &tail)) {
2301 #ifndef FPROF_KERNEL
2302 _has_profile = true;
2303 #else // FPROF_KERNEL
2304 // do we have to exit?
2305 warning("Kernel VM does not support flat profiling.");
2306 #endif // FPROF_KERNEL
2307 // -Xaprof
2308 } else if (match_option(option, "-Xaprof", &tail)) {
2309 _has_alloc_profile = true;
2310 // -Xconcurrentio
2311 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2312 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2313 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2314 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2315 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2316 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2317
2318 // -Xinternalversion
2319 } else if (match_option(option, "-Xinternalversion", &tail)) {
2320 jio_fprintf(defaultStream::output_stream(), "%s\n",
2321 VM_Version::internal_vm_info_string());
2322 vm_exit(0);
2323 #ifndef PRODUCT
2324 // -Xprintflags
2325 } else if (match_option(option, "-Xprintflags", &tail)) {
2326 CommandLineFlags::printFlags();
2327 vm_exit(0);
2328 #endif
2329 // -D
2330 } else if (match_option(option, "-D", &tail)) {
2331 if (!add_property(tail)) {
2332 return JNI_ENOMEM;
2333 }
2334 // Out of the box management support
2335 if (match_option(option, "-Dcom.sun.management", &tail)) {
2336 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2337 }
2338 // -Xint
2339 } else if (match_option(option, "-Xint", &tail)) {
2340 set_mode_flags(_int);
2341 // -Xmixed
2342 } else if (match_option(option, "-Xmixed", &tail)) {
2343 set_mode_flags(_mixed);
2344 // -Xcomp
2345 } else if (match_option(option, "-Xcomp", &tail)) {
2346 // for testing the compiler; turn off all flags that inhibit compilation
2347 set_mode_flags(_comp);
2348
2349 // -Xshare:dump
2350 } else if (match_option(option, "-Xshare:dump", &tail)) {
2351 #ifdef TIERED
2352 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2353 set_mode_flags(_int); // Prevent compilation, which creates objects
2354 #elif defined(COMPILER2)
2355 vm_exit_during_initialization(
2356 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2357 #elif defined(KERNEL)
2358 vm_exit_during_initialization(
2359 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2360 #else
2361 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2362 set_mode_flags(_int); // Prevent compilation, which creates objects
2363 #endif
2364 // -Xshare:on
2365 } else if (match_option(option, "-Xshare:on", &tail)) {
2366 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2367 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2368 // -Xshare:auto
2369 } else if (match_option(option, "-Xshare:auto", &tail)) {
2370 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2371 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2372 // -Xshare:off
2373 } else if (match_option(option, "-Xshare:off", &tail)) {
2374 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2375 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2376
2377 // -Xverify
2378 } else if (match_option(option, "-Xverify", &tail)) {
2379 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2380 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2381 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2382 } else if (strcmp(tail, ":remote") == 0) {
2383 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2384 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2385 } else if (strcmp(tail, ":none") == 0) {
2386 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2387 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2388 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2389 return JNI_EINVAL;
2390 }
2391 // -Xdebug
2392 } else if (match_option(option, "-Xdebug", &tail)) {
2393 // note this flag has been used, then ignore
2394 set_xdebug_mode(true);
2395 // -Xnoagent
2396 } else if (match_option(option, "-Xnoagent", &tail)) {
2397 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2398 } else if (match_option(option, "-Xboundthreads", &tail)) {
2399 // Bind user level threads to kernel threads (Solaris only)
2400 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2401 } else if (match_option(option, "-Xloggc:", &tail)) {
2402 // Redirect GC output to the file. -Xloggc:<filename>
2403 // ostream_init_log(), when called will use this filename
2404 // to initialize a fileStream.
2405 _gc_log_filename = strdup(tail);
2406 FLAG_SET_CMDLINE(bool, PrintGC, true);
2407 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2408
2409 // JNI hooks
2410 } else if (match_option(option, "-Xcheck", &tail)) {
2411 if (!strcmp(tail, ":jni")) {
2412 CheckJNICalls = true;
2413 } else if (is_bad_option(option, args->ignoreUnrecognized,
2414 "check")) {
2415 return JNI_EINVAL;
2416 }
2417 } else if (match_option(option, "vfprintf", &tail)) {
2418 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2419 } else if (match_option(option, "exit", &tail)) {
2420 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2421 } else if (match_option(option, "abort", &tail)) {
2422 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2423 // -XX:+AggressiveHeap
2424 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2425
2426 // This option inspects the machine and attempts to set various
2427 // parameters to be optimal for long-running, memory allocation
2428 // intensive jobs. It is intended for machines with large
2429 // amounts of cpu and memory.
2430
2431 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2432 // VM, but we may not be able to represent the total physical memory
2433 // available (like having 8gb of memory on a box but using a 32bit VM).
2434 // Thus, we need to make sure we're using a julong for intermediate
2435 // calculations.
2436 julong initHeapSize;
2437 julong total_memory = os::physical_memory();
2438
2439 if (total_memory < (julong)256*M) {
2440 jio_fprintf(defaultStream::error_stream(),
2441 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2442 vm_exit(1);
2443 }
2444
2445 // The heap size is half of available memory, or (at most)
2446 // all of possible memory less 160mb (leaving room for the OS
2447 // when using ISM). This is the maximum; because adaptive sizing
2448 // is turned on below, the actual space used may be smaller.
2449
2450 initHeapSize = MIN2(total_memory / (julong)2,
2451 total_memory - (julong)160*M);
2452
2453 // Make sure that if we have a lot of memory we cap the 32 bit
2454 // process space. The 64bit VM version of this function is a nop.
2455 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2456
2457 // The perm gen is separate but contiguous with the
2458 // object heap (and is reserved with it) so subtract it
2459 // from the heap size.
2460 if (initHeapSize > MaxPermSize) {
2461 initHeapSize = initHeapSize - MaxPermSize;
2462 } else {
2463 warning("AggressiveHeap and MaxPermSize values may conflict");
2464 }
2465
2466 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2467 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2468 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2469 // Currently the minimum size and the initial heap sizes are the same.
2470 set_min_heap_size(initHeapSize);
2471 }
2472 if (FLAG_IS_DEFAULT(NewSize)) {
2473 // Make the young generation 3/8ths of the total heap.
2474 FLAG_SET_CMDLINE(uintx, NewSize,
2475 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2476 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2477 }
2478
2479 FLAG_SET_DEFAULT(UseLargePages, true);
2480
2481 // Increase some data structure sizes for efficiency
2482 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2483 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2484 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2485
2486 // See the OldPLABSize comment below, but replace 'after promotion'
2487 // with 'after copying'. YoungPLABSize is the size of the survivor
2488 // space per-gc-thread buffers. The default is 4kw.
2489 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2490
2491 // OldPLABSize is the size of the buffers in the old gen that
2492 // UseParallelGC uses to promote live data that doesn't fit in the
2493 // survivor spaces. At any given time, there's one for each gc thread.
2494 // The default size is 1kw. These buffers are rarely used, since the
2495 // survivor spaces are usually big enough. For specjbb, however, there
2496 // are occasions when there's lots of live data in the young gen
2497 // and we end up promoting some of it. We don't have a definite
2498 // explanation for why bumping OldPLABSize helps, but the theory
2499 // is that a bigger PLAB results in retaining something like the
2500 // original allocation order after promotion, which improves mutator
2501 // locality. A minor effect may be that larger PLABs reduce the
2502 // number of PLAB allocation events during gc. The value of 8kw
2503 // was arrived at by experimenting with specjbb.
2504 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2505
2506 // CompilationPolicyChoice=0 causes the server compiler to adopt
2507 // a more conservative which-method-do-I-compile policy when one
2508 // of the counters maintained by the interpreter trips. The
2509 // result is reduced startup time and improved specjbb and
2510 // alacrity performance. Zero is the default, but we set it
2511 // explicitly here in case the default changes.
2512 // See runtime/compilationPolicy.*.
2513 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2514
2515 // Enable parallel GC and adaptive generation sizing
2516 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2517 FLAG_SET_DEFAULT(ParallelGCThreads,
2518 Abstract_VM_Version::parallel_worker_threads());
2519
2520 // Encourage steady state memory management
2521 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2522
2523 // This appears to improve mutator locality
2524 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2525
2526 // Get around early Solaris scheduling bug
2527 // (affinity vs other jobs on system)
2528 // but disallow DR and offlining (5008695).
2529 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2530
2531 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2532 // The last option must always win.
2533 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2534 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2535 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2536 // The last option must always win.
2537 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2538 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2539 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2540 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2541 jio_fprintf(defaultStream::error_stream(),
2542 "Please use CMSClassUnloadingEnabled in place of "
2543 "CMSPermGenSweepingEnabled in the future\n");
2544 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2545 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2546 jio_fprintf(defaultStream::error_stream(),
2547 "Please use -XX:+UseGCOverheadLimit in place of "
2548 "-XX:+UseGCTimeLimit in the future\n");
2549 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2550 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2551 jio_fprintf(defaultStream::error_stream(),
2552 "Please use -XX:-UseGCOverheadLimit in place of "
2553 "-XX:-UseGCTimeLimit in the future\n");
2554 // The TLE options are for compatibility with 1.3 and will be
2555 // removed without notice in a future release. These options
2556 // are not to be documented.
2557 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2558 // No longer used.
2559 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2560 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2561 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2562 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2563 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2564 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2565 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2566 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2567 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2568 // No longer used.
2569 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2570 julong long_tlab_size = 0;
2571 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2572 if (errcode != arg_in_range) {
2573 jio_fprintf(defaultStream::error_stream(),
2574 "Invalid TLAB size: %s\n", option->optionString);
2575 describe_range_error(errcode);
2576 return JNI_EINVAL;
2577 }
2578 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2579 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2580 // No longer used.
2581 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2582 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2583 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2584 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2585 SOLARIS_ONLY(
2586 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2587 warning("-XX:+UsePermISM is obsolete.");
2588 FLAG_SET_CMDLINE(bool, UseISM, true);
2589 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2590 FLAG_SET_CMDLINE(bool, UseISM, false);
2591 )
2592 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2593 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2594 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2595 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2596 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2597 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2598 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2599 #if defined(DTRACE_ENABLED)
2600 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2601 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2602 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2603 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2604 #else // defined(DTRACE_ENABLED)
2605 jio_fprintf(defaultStream::error_stream(),
2606 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2607 return JNI_EINVAL;
2608 #endif // defined(DTRACE_ENABLED)
2609 #ifdef ASSERT
2610 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2611 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2612 // disable scavenge before parallel mark-compact
2613 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2614 #endif
2615 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2616 julong cms_blocks_to_claim = (julong)atol(tail);
2617 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2618 jio_fprintf(defaultStream::error_stream(),
2619 "Please use -XX:OldPLABSize in place of "
2620 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2621 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2622 julong cms_blocks_to_claim = (julong)atol(tail);
2623 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2624 jio_fprintf(defaultStream::error_stream(),
2625 "Please use -XX:OldPLABSize in place of "
2626 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2627 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2628 julong old_plab_size = 0;
2629 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2630 if (errcode != arg_in_range) {
2631 jio_fprintf(defaultStream::error_stream(),
2632 "Invalid old PLAB size: %s\n", option->optionString);
2633 describe_range_error(errcode);
2634 return JNI_EINVAL;
2635 }
2636 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2637 jio_fprintf(defaultStream::error_stream(),
2638 "Please use -XX:OldPLABSize in place of "
2639 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2640 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2641 julong young_plab_size = 0;
2642 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2643 if (errcode != arg_in_range) {
2644 jio_fprintf(defaultStream::error_stream(),
2645 "Invalid young PLAB size: %s\n", option->optionString);
2646 describe_range_error(errcode);
2647 return JNI_EINVAL;
2648 }
2649 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2650 jio_fprintf(defaultStream::error_stream(),
2651 "Please use -XX:YoungPLABSize in place of "
2652 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2653 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2654 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2655 julong stack_size = 0;
2656 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2657 if (errcode != arg_in_range) {
2658 jio_fprintf(defaultStream::error_stream(),
2659 "Invalid mark stack size: %s\n", option->optionString);
2660 describe_range_error(errcode);
2661 return JNI_EINVAL;
2662 }
2663 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2664 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2665 julong max_stack_size = 0;
2666 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2667 if (errcode != arg_in_range) {
2668 jio_fprintf(defaultStream::error_stream(),
2669 "Invalid maximum mark stack size: %s\n",
2670 option->optionString);
2671 describe_range_error(errcode);
2672 return JNI_EINVAL;
2673 }
2674 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2675 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2676 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2677 uintx conc_threads = 0;
2678 if (!parse_uintx(tail, &conc_threads, 1)) {
2679 jio_fprintf(defaultStream::error_stream(),
2680 "Invalid concurrent threads: %s\n", option->optionString);
2681 return JNI_EINVAL;
2682 }
2683 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2684 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2685 // Skip -XX:Flags= since that case has already been handled
2686 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2687 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2688 return JNI_EINVAL;
2689 }
2690 }
2691 // Unknown option
2692 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2693 return JNI_ERR;
2694 }
2695 }
2696
2697 // Change the default value for flags which have different default values
2698 // when working with older JDKs.
2699 if (JDK_Version::current().compare_major(6) <= 0 &&
2700 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2701 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2702 }
2703 #ifdef LINUX
2704 if (JDK_Version::current().compare_major(6) <= 0 &&
2705 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2706 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2707 }
2708 #endif // LINUX
2709 return JNI_OK;
2710 }
2711
2712 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2713 // This must be done after all -D arguments have been processed.
2714 scp_p->expand_endorsed();
2715
2716 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2717 // Assemble the bootclasspath elements into the final path.
2718 Arguments::set_sysclasspath(scp_p->combined_path());
2719 }
2720
2721 // This must be done after all arguments have been processed.
2722 // java_compiler() true means set to "NONE" or empty.
2723 if (java_compiler() && !xdebug_mode()) {
2724 // For backwards compatibility, we switch to interpreted mode if
2725 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2726 // not specified.
2727 set_mode_flags(_int);
2728 }
2729 if (CompileThreshold == 0) {
2730 set_mode_flags(_int);
2731 }
2732
2733 #ifndef COMPILER2
2734 // Don't degrade server performance for footprint
2735 if (FLAG_IS_DEFAULT(UseLargePages) &&
2736 MaxHeapSize < LargePageHeapSizeThreshold) {
2737 // No need for large granularity pages w/small heaps.
2738 // Note that large pages are enabled/disabled for both the
2739 // Java heap and the code cache.
2740 FLAG_SET_DEFAULT(UseLargePages, false);
2741 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2742 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2743 }
2744
2745 // Tiered compilation is undefined with C1.
2746 TieredCompilation = false;
2747 #else
2748 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2749 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2750 }
2751 #endif
2752
2753 // If we are running in a headless jre, force java.awt.headless property
2754 // to be true unless the property has already been set.
2755 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2756 if (os::is_headless_jre()) {
2757 const char* headless = Arguments::get_property("java.awt.headless");
2758 if (headless == NULL) {
2759 char envbuffer[128];
2760 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2761 if (!add_property("java.awt.headless=true")) {
2762 return JNI_ENOMEM;
2763 }
2764 } else {
2765 char buffer[256];
2766 strcpy(buffer, "java.awt.headless=");
2767 strcat(buffer, envbuffer);
2768 if (!add_property(buffer)) {
2769 return JNI_ENOMEM;
2770 }
2771 }
2772 }
2773 }
2774
2775 if (!check_vm_args_consistency()) {
2776 return JNI_ERR;
2777 }
2778
2779 return JNI_OK;
2780 }
2781
2782 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2783 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2784 scp_assembly_required_p);
2785 }
2786
2787 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2788 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2789 scp_assembly_required_p);
2790 }
2791
2792 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2793 const int N_MAX_OPTIONS = 64;
2794 const int OPTION_BUFFER_SIZE = 1024;
2795 char buffer[OPTION_BUFFER_SIZE];
2796
2797 // The variable will be ignored if it exceeds the length of the buffer.
2798 // Don't check this variable if user has special privileges
2799 // (e.g. unix su command).
2800 if (os::getenv(name, buffer, sizeof(buffer)) &&
2801 !os::have_special_privileges()) {
2802 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2803 jio_fprintf(defaultStream::error_stream(),
2804 "Picked up %s: %s\n", name, buffer);
2805 char* rd = buffer; // pointer to the input string (rd)
2806 int i;
2807 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2808 while (isspace(*rd)) rd++; // skip whitespace
2809 if (*rd == 0) break; // we re done when the input string is read completely
2810
2811 // The output, option string, overwrites the input string.
2812 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2813 // input string (rd).
2814 char* wrt = rd;
2815
2816 options[i++].optionString = wrt; // Fill in option
2817 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2818 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2819 int quote = *rd; // matching quote to look for
2820 rd++; // don't copy open quote
2821 while (*rd != quote) { // include everything (even spaces) up until quote
2822 if (*rd == 0) { // string termination means unmatched string
2823 jio_fprintf(defaultStream::error_stream(),
2824 "Unmatched quote in %s\n", name);
2825 return JNI_ERR;
2826 }
2827 *wrt++ = *rd++; // copy to option string
2828 }
2829 rd++; // don't copy close quote
2830 } else {
2831 *wrt++ = *rd++; // copy to option string
2832 }
2833 }
2834 // Need to check if we're done before writing a NULL,
2835 // because the write could be to the byte that rd is pointing to.
2836 if (*rd++ == 0) {
2837 *wrt = 0;
2838 break;
2839 }
2840 *wrt = 0; // Zero terminate option
2841 }
2842 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2843 JavaVMInitArgs vm_args;
2844 vm_args.version = JNI_VERSION_1_2;
2845 vm_args.options = options;
2846 vm_args.nOptions = i;
2847 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2848
2849 if (PrintVMOptions) {
2850 const char* tail;
2851 for (int i = 0; i < vm_args.nOptions; i++) {
2852 const JavaVMOption *option = vm_args.options + i;
2853 if (match_option(option, "-XX:", &tail)) {
2854 logOption(tail);
2855 }
2856 }
2857 }
2858
2859 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2860 }
2861 return JNI_OK;
2862 }
2863
2864 void Arguments::set_shared_spaces_flags() {
2865 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
2866 const bool might_share = must_share || UseSharedSpaces;
2867
2868 // The string table is part of the shared archive so the size must match.
2869 if (!FLAG_IS_DEFAULT(StringTableSize)) {
2870 // Disable sharing.
2871 if (must_share) {
2872 warning("disabling shared archive %s because of non-default "
2873 "StringTableSize", DumpSharedSpaces ? "creation" : "use");
2874 }
2875 if (might_share) {
2876 FLAG_SET_DEFAULT(DumpSharedSpaces, false);
2877 FLAG_SET_DEFAULT(RequireSharedSpaces, false);
2878 FLAG_SET_DEFAULT(UseSharedSpaces, false);
2879 }
2880 return;
2881 }
2882
2883 // Check whether class data sharing settings conflict with GC, compressed oops
2884 // or page size, and fix them up. Explicit sharing options override other
2885 // settings.
2886 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
2887 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
2888 UseCompressedOops || UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
2889 if (cannot_share) {
2890 if (must_share) {
2891 warning("selecting serial gc and disabling large pages %s"
2892 "because of %s", "" LP64_ONLY("and compressed oops "),
2893 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
2894 force_serial_gc();
2895 FLAG_SET_CMDLINE(bool, UseLargePages, false);
2896 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
2897 } else {
2898 if (UseSharedSpaces && Verbose) {
2899 warning("turning off use of shared archive because of "
2900 "choice of garbage collector or large pages");
2901 }
2902 no_shared_spaces();
2903 }
2904 } else if (UseLargePages && might_share) {
2905 // Disable large pages to allow shared spaces. This is sub-optimal, since
2906 // there may not even be a shared archive to use.
2907 FLAG_SET_DEFAULT(UseLargePages, false);
2908 }
2909 }
2910
2911 // Disable options not supported in this release, with a warning if they
2912 // were explicitly requested on the command-line
2913 #define UNSUPPORTED_OPTION(opt, description) \
2914 do { \
2915 if (opt) { \
2916 if (FLAG_IS_CMDLINE(opt)) { \
2917 warning(description " is disabled in this release."); \
2918 } \
2919 FLAG_SET_DEFAULT(opt, false); \
2920 } \
2921 } while(0)
2922
2923 // Parse entry point called from JNI_CreateJavaVM
2924
2925 jint Arguments::parse(const JavaVMInitArgs* args) {
2926
2927 // Sharing support
2928 // Construct the path to the archive
2929 char jvm_path[JVM_MAXPATHLEN];
2930 os::jvm_path(jvm_path, sizeof(jvm_path));
2931 #ifdef TIERED
2932 if (strstr(jvm_path, "client") != NULL) {
2933 force_client_mode = true;
2934 }
2935 #endif // TIERED
2936 char *end = strrchr(jvm_path, *os::file_separator());
2937 if (end != NULL) *end = '\0';
2938 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2939 strlen(os::file_separator()) + 20);
2940 if (shared_archive_path == NULL) return JNI_ENOMEM;
2941 strcpy(shared_archive_path, jvm_path);
2942 strcat(shared_archive_path, os::file_separator());
2943 strcat(shared_archive_path, "classes");
2944 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2945 strcat(shared_archive_path, ".jsa");
2946 SharedArchivePath = shared_archive_path;
2947
2948 // Remaining part of option string
2949 const char* tail;
2950
2951 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2952 bool settings_file_specified = false;
2953 const char* flags_file;
2954 int index;
2955 for (index = 0; index < args->nOptions; index++) {
2956 const JavaVMOption *option = args->options + index;
2957 if (match_option(option, "-XX:Flags=", &tail)) {
2958 flags_file = tail;
2959 settings_file_specified = true;
2960 }
2961 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2962 PrintVMOptions = true;
2963 }
2964 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2965 PrintVMOptions = false;
2966 }
2967 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2968 IgnoreUnrecognizedVMOptions = true;
2969 }
2970 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2971 IgnoreUnrecognizedVMOptions = false;
2972 }
2973 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2974 CommandLineFlags::printFlags();
2975 vm_exit(0);
2976 }
2977
2978 #ifndef PRODUCT
2979 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
2980 CommandLineFlags::printFlags(true);
2981 vm_exit(0);
2982 }
2983 #endif
2984 }
2985
2986 if (IgnoreUnrecognizedVMOptions) {
2987 // uncast const to modify the flag args->ignoreUnrecognized
2988 *(jboolean*)(&args->ignoreUnrecognized) = true;
2989 }
2990
2991 // Parse specified settings file
2992 if (settings_file_specified) {
2993 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2994 return JNI_EINVAL;
2995 }
2996 }
2997
2998 // Parse default .hotspotrc settings file
2999 if (!settings_file_specified) {
3000 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3001 return JNI_EINVAL;
3002 }
3003 }
3004
3005 if (PrintVMOptions) {
3006 for (index = 0; index < args->nOptions; index++) {
3007 const JavaVMOption *option = args->options + index;
3008 if (match_option(option, "-XX:", &tail)) {
3009 logOption(tail);
3010 }
3011 }
3012 }
3013
3014 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3015 jint result = parse_vm_init_args(args);
3016 if (result != JNI_OK) {
3017 return result;
3018 }
3019
3020 #ifdef JAVASE_EMBEDDED
3021 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3022 #endif
3023
3024 #ifndef PRODUCT
3025 if (TraceBytecodesAt != 0) {
3026 TraceBytecodes = true;
3027 }
3028 if (CountCompiledCalls) {
3029 if (UseCounterDecay) {
3030 warning("UseCounterDecay disabled because CountCalls is set");
3031 UseCounterDecay = false;
3032 }
3033 }
3034 #endif // PRODUCT
3035
3036 // Transitional
3037 if (EnableMethodHandles || AnonymousClasses) {
3038 if (!EnableInvokeDynamic && !FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3039 warning("EnableMethodHandles and AnonymousClasses are obsolete. Keeping EnableInvokeDynamic disabled.");
3040 } else {
3041 EnableInvokeDynamic = true;
3042 }
3043 }
3044
3045 // JSR 292 is not supported before 1.7
3046 if (!JDK_Version::is_gte_jdk17x_version()) {
3047 if (EnableInvokeDynamic) {
3048 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3049 warning("JSR 292 is not supported before 1.7. Disabling support.");
3050 }
3051 EnableInvokeDynamic = false;
3052 }
3053 }
3054
3055 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3056 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3057 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3058 }
3059 ScavengeRootsInCode = 1;
3060 }
3061 if (!JavaObjectsInPerm && ScavengeRootsInCode == 0) {
3062 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3063 warning("forcing ScavengeRootsInCode non-zero because JavaObjectsInPerm is false");
3064 }
3065 ScavengeRootsInCode = 1;
3066 }
3067
3068 if (PrintGCDetails) {
3069 // Turn on -verbose:gc options as well
3070 PrintGC = true;
3071 }
3072
3073 // Set object alignment values.
3074 set_object_alignment();
3075
3076 #ifdef SERIALGC
3077 force_serial_gc();
3078 #endif // SERIALGC
3079 #ifdef KERNEL
3080 no_shared_spaces();
3081 #endif // KERNEL
3082
3083 // Set flags based on ergonomics.
3084 set_ergonomics_flags();
3085
3086 set_shared_spaces_flags();
3087
3088 // Check the GC selections again.
3089 if (!check_gc_consistency()) {
3090 return JNI_EINVAL;
3091 }
3092
3093 if (TieredCompilation) {
3094 set_tiered_flags();
3095 } else {
3096 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3097 if (CompilationPolicyChoice >= 2) {
3098 vm_exit_during_initialization(
3099 "Incompatible compilation policy selected", NULL);
3100 }
3101 }
3102
3103 #ifndef KERNEL
3104 // Set heap size based on available physical memory
3105 set_heap_size();
3106 // Set per-collector flags
3107 if (UseParallelGC || UseParallelOldGC) {
3108 set_parallel_gc_flags();
3109 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3110 set_cms_and_parnew_gc_flags();
3111 } else if (UseParNewGC) { // skipped if CMS is set above
3112 set_parnew_gc_flags();
3113 } else if (UseG1GC) {
3114 set_g1_gc_flags();
3115 }
3116 #endif // KERNEL
3117
3118 #ifdef SERIALGC
3119 assert(verify_serial_gc_flags(), "SerialGC unset");
3120 #endif // SERIALGC
3121
3122 // Set bytecode rewriting flags
3123 set_bytecode_flags();
3124
3125 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3126 set_aggressive_opts_flags();
3127
3128 // Turn off biased locking for locking debug mode flags,
3129 // which are subtlely different from each other but neither works with
3130 // biased locking.
3131 if (UseHeavyMonitors
3132 #ifdef COMPILER1
3133 || !UseFastLocking
3134 #endif // COMPILER1
3135 ) {
3136 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3137 // flag set to true on command line; warn the user that they
3138 // can't enable biased locking here
3139 warning("Biased Locking is not supported with locking debug flags"
3140 "; ignoring UseBiasedLocking flag." );
3141 }
3142 UseBiasedLocking = false;
3143 }
3144
3145 #ifdef CC_INTERP
3146 // Clear flags not supported by the C++ interpreter
3147 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3148 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3149 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3150 #endif // CC_INTERP
3151
3152 #ifdef COMPILER2
3153 if (!UseBiasedLocking || EmitSync != 0) {
3154 UseOptoBiasInlining = false;
3155 }
3156 #endif
3157
3158 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3159 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3160 DebugNonSafepoints = true;
3161 }
3162
3163 #ifndef PRODUCT
3164 if (CompileTheWorld) {
3165 // Force NmethodSweeper to sweep whole CodeCache each time.
3166 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3167 NmethodSweepFraction = 1;
3168 }
3169 }
3170 #endif
3171
3172 if (PrintCommandLineFlags) {
3173 CommandLineFlags::printSetFlags();
3174 }
3175
3176 // Apply CPU specific policy for the BiasedLocking
3177 if (UseBiasedLocking) {
3178 if (!VM_Version::use_biased_locking() &&
3179 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3180 UseBiasedLocking = false;
3181 }
3182 }
3183
3184 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3185 // but only if not already set on the commandline
3186 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3187 bool set = false;
3188 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3189 if (!set) {
3190 FLAG_SET_DEFAULT(PauseAtExit, true);
3191 }
3192 }
3193
3194 return JNI_OK;
3195 }
3196
3197 int Arguments::PropertyList_count(SystemProperty* pl) {
3198 int count = 0;
3199 while(pl != NULL) {
3200 count++;
3201 pl = pl->next();
3202 }
3203 return count;
3204 }
3205
3206 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3207 assert(key != NULL, "just checking");
3208 SystemProperty* prop;
3209 for (prop = pl; prop != NULL; prop = prop->next()) {
3210 if (strcmp(key, prop->key()) == 0) return prop->value();
3211 }
3212 return NULL;
3213 }
3214
3215 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3216 int count = 0;
3217 const char* ret_val = NULL;
3218
3219 while(pl != NULL) {
3220 if(count >= index) {
3221 ret_val = pl->key();
3222 break;
3223 }
3224 count++;
3225 pl = pl->next();
3226 }
3227
3228 return ret_val;
3229 }
3230
3231 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3232 int count = 0;
3233 char* ret_val = NULL;
3234
3235 while(pl != NULL) {
3236 if(count >= index) {
3237 ret_val = pl->value();
3238 break;
3239 }
3240 count++;
3241 pl = pl->next();
3242 }
3243
3244 return ret_val;
3245 }
3246
3247 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3248 SystemProperty* p = *plist;
3249 if (p == NULL) {
3250 *plist = new_p;
3251 } else {
3252 while (p->next() != NULL) {
3253 p = p->next();
3254 }
3255 p->set_next(new_p);
3256 }
3257 }
3258
3259 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3260 if (plist == NULL)
3261 return;
3262
3263 SystemProperty* new_p = new SystemProperty(k, v, true);
3264 PropertyList_add(plist, new_p);
3265 }
3266
3267 // This add maintains unique property key in the list.
3268 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3269 if (plist == NULL)
3270 return;
3271
3272 // If property key exist then update with new value.
3273 SystemProperty* prop;
3274 for (prop = *plist; prop != NULL; prop = prop->next()) {
3275 if (strcmp(k, prop->key()) == 0) {
3276 if (append) {
3277 prop->append_value(v);
3278 } else {
3279 prop->set_value(v);
3280 }
3281 return;
3282 }
3283 }
3284
3285 PropertyList_add(plist, k, v);
3286 }
3287
3288 #ifdef KERNEL
3289 char *Arguments::get_kernel_properties() {
3290 // Find properties starting with kernel and append them to string
3291 // We need to find out how long they are first because the URL's that they
3292 // might point to could get long.
3293 int length = 0;
3294 SystemProperty* prop;
3295 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3296 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3297 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3298 }
3299 }
3300 // Add one for null terminator.
3301 char *props = AllocateHeap(length + 1, "get_kernel_properties");
3302 if (length != 0) {
3303 int pos = 0;
3304 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3305 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3306 jio_snprintf(&props[pos], length-pos,
3307 "-D%s=%s ", prop->key(), prop->value());
3308 pos = strlen(props);
3309 }
3310 }
3311 }
3312 // null terminate props in case of null
3313 props[length] = '\0';
3314 return props;
3315 }
3316 #endif // KERNEL
3317
3318 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3319 // Returns true if all of the source pointed by src has been copied over to
3320 // the destination buffer pointed by buf. Otherwise, returns false.
3321 // Notes:
3322 // 1. If the length (buflen) of the destination buffer excluding the
3323 // NULL terminator character is not long enough for holding the expanded
3324 // pid characters, it also returns false instead of returning the partially
3325 // expanded one.
3326 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3327 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3328 char* buf, size_t buflen) {
3329 const char* p = src;
3330 char* b = buf;
3331 const char* src_end = &src[srclen];
3332 char* buf_end = &buf[buflen - 1];
3333
3334 while (p < src_end && b < buf_end) {
3335 if (*p == '%') {
3336 switch (*(++p)) {
3337 case '%': // "%%" ==> "%"
3338 *b++ = *p++;
3339 break;
3340 case 'p': { // "%p" ==> current process id
3341 // buf_end points to the character before the last character so
3342 // that we could write '\0' to the end of the buffer.
3343 size_t buf_sz = buf_end - b + 1;
3344 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3345
3346 // if jio_snprintf fails or the buffer is not long enough to hold
3347 // the expanded pid, returns false.
3348 if (ret < 0 || ret >= (int)buf_sz) {
3349 return false;
3350 } else {
3351 b += ret;
3352 assert(*b == '\0', "fail in copy_expand_pid");
3353 if (p == src_end && b == buf_end + 1) {
3354 // reach the end of the buffer.
3355 return true;
3356 }
3357 }
3358 p++;
3359 break;
3360 }
3361 default :
3362 *b++ = '%';
3363 }
3364 } else {
3365 *b++ = *p++;
3366 }
3367 }
3368 *b = '\0';
3369 return (p == src_end); // return false if not all of the source was copied
3370 }