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 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1363 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1364 }
1365 #endif
1366 #ifdef _WIN64
1367 if (UseLargePages && UseCompressedOops) {
1368 // Cannot allocate guard pages for implicit checks in indexed addressing
1369 // mode, when large pages are specified on windows.
1370 // This flag could be switched ON if narrow oop base address is set to 0,
1371 // see code in Universe::initialize_heap().
1372 Universe::set_narrow_oop_use_implicit_null_checks(false);
1373 }
1374 #endif // _WIN64
1375 } else {
1376 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1377 warning("Max heap size too large for Compressed Oops");
1378 FLAG_SET_DEFAULT(UseCompressedOops, false);
1379 }
1380 }
1381 // Also checks that certain machines are slower with compressed oops
1382 // in vm_version initialization code.
1383 #endif // _LP64
1384 #endif // !ZERO
1385 }
1386
1387 void Arguments::set_parallel_gc_flags() {
1388 assert(UseParallelGC || UseParallelOldGC, "Error");
1389 // If parallel old was requested, automatically enable parallel scavenge.
1390 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1391 FLAG_SET_DEFAULT(UseParallelGC, true);
1392 }
1393
1394 // If no heap maximum was requested explicitly, use some reasonable fraction
1395 // of the physical memory, up to a maximum of 1GB.
1396 if (UseParallelGC) {
1397 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1398 Abstract_VM_Version::parallel_worker_threads());
1399
1400 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1401 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1402 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1403 // See CR 6362902 for details.
1404 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1405 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1406 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1407 }
1408 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1409 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1410 }
1411 }
1412
1413 if (UseParallelOldGC) {
1414 // Par compact uses lower default values since they are treated as
1415 // minimums. These are different defaults because of the different
1416 // interpretation and are not ergonomically set.
1417 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1418 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1419 }
1420 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1421 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1422 }
1423 }
1424 }
1425 if (UseNUMA) {
1426 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
1427 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
1428 }
1429 // For those collectors or operating systems (eg, Windows) that do
1430 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
1431 UseNUMAInterleaving = true;
1432 }
1433 }
1434
1435 void Arguments::set_g1_gc_flags() {
1436 assert(UseG1GC, "Error");
1437 #ifdef COMPILER1
1438 FastTLABRefill = false;
1439 #endif
1440 FLAG_SET_DEFAULT(ParallelGCThreads,
1441 Abstract_VM_Version::parallel_worker_threads());
1442 if (ParallelGCThreads == 0) {
1443 FLAG_SET_DEFAULT(ParallelGCThreads,
1444 Abstract_VM_Version::parallel_worker_threads());
1445 }
1446 no_shared_spaces();
1447
1448 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1449 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1450 }
1451 if (PrintGCDetails && Verbose) {
1452 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1453 MarkStackSize / K, MarkStackSizeMax / K);
1454 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1455 }
1456
1457 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1458 // In G1, we want the default GC overhead goal to be higher than
1459 // say in PS. So we set it here to 10%. Otherwise the heap might
1460 // be expanded more aggressively than we would like it to. In
1461 // fact, even 10% seems to not be high enough in some cases
1462 // (especially small GC stress tests that the main thing they do
1463 // is allocation). We might consider increase it further.
1464 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1465 }
1466 }
1467
1468 void Arguments::set_heap_size() {
1469 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1470 // Deprecated flag
1471 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1472 }
1473
1474 const julong phys_mem =
1475 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1476 : (julong)MaxRAM;
1477
1478 // If the maximum heap size has not been set with -Xmx,
1479 // then set it as fraction of the size of physical memory,
1480 // respecting the maximum and minimum sizes of the heap.
1481 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1482 julong reasonable_max = phys_mem / MaxRAMFraction;
1483
1484 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1485 // Small physical memory, so use a minimum fraction of it for the heap
1486 reasonable_max = phys_mem / MinRAMFraction;
1487 } else {
1488 // Not-small physical memory, so require a heap at least
1489 // as large as MaxHeapSize
1490 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1491 }
1492 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1493 // Limit the heap size to ErgoHeapSizeLimit
1494 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1495 }
1496 if (UseCompressedOops) {
1497 // Limit the heap size to the maximum possible when using compressed oops
1498 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1499 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1500 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1501 // but it should be not less than default MaxHeapSize.
1502 max_coop_heap -= HeapBaseMinAddress;
1503 }
1504 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1505 }
1506 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1507
1508 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1509 // An initial heap size was specified on the command line,
1510 // so be sure that the maximum size is consistent. Done
1511 // after call to allocatable_physical_memory because that
1512 // method might reduce the allocation size.
1513 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1514 }
1515
1516 if (PrintGCDetails && Verbose) {
1517 // Cannot use gclog_or_tty yet.
1518 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1519 }
1520 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1521 }
1522
1523 // If the initial_heap_size has not been set with InitialHeapSize
1524 // or -Xms, then set it as fraction of the size of physical memory,
1525 // respecting the maximum and minimum sizes of the heap.
1526 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1527 julong reasonable_minimum = (julong)(OldSize + NewSize);
1528
1529 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1530
1531 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1532
1533 julong reasonable_initial = phys_mem / InitialRAMFraction;
1534
1535 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1536 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1537
1538 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1539
1540 if (PrintGCDetails && Verbose) {
1541 // Cannot use gclog_or_tty yet.
1542 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1543 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1544 }
1545 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1546 set_min_heap_size((uintx)reasonable_minimum);
1547 }
1548 }
1549
1550 // This must be called after ergonomics because we want bytecode rewriting
1551 // if the server compiler is used, or if UseSharedSpaces is disabled.
1552 void Arguments::set_bytecode_flags() {
1553 // Better not attempt to store into a read-only space.
1554 if (UseSharedSpaces) {
1555 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1556 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1557 }
1558
1559 if (!RewriteBytecodes) {
1560 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1561 }
1562 }
1563
1564 // Aggressive optimization flags -XX:+AggressiveOpts
1565 void Arguments::set_aggressive_opts_flags() {
1566 #ifdef COMPILER2
1567 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1568 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1569 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1570 }
1571 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1572 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1573 }
1574
1575 // Feed the cache size setting into the JDK
1576 char buffer[1024];
1577 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1578 add_property(buffer);
1579 }
1580 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1581 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1582 }
1583 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1584 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1585 }
1586 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) {
1587 FLAG_SET_DEFAULT(OptimizeStringConcat, true);
1588 }
1589 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeFill)) {
1590 FLAG_SET_DEFAULT(OptimizeFill, true);
1591 }
1592 #endif
1593
1594 if (AggressiveOpts) {
1595 // Sample flag setting code
1596 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1597 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1598 // }
1599 }
1600 }
1601
1602 //===========================================================================================================
1603 // Parsing of java.compiler property
1604
1605 void Arguments::process_java_compiler_argument(char* arg) {
1606 // For backwards compatibility, Djava.compiler=NONE or ""
1607 // causes us to switch to -Xint mode UNLESS -Xdebug
1608 // is also specified.
1609 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1610 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1611 }
1612 }
1613
1614 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1615 _sun_java_launcher = strdup(launcher);
1616 if (strcmp("gamma", _sun_java_launcher) == 0) {
1617 _created_by_gamma_launcher = true;
1618 }
1619 }
1620
1621 bool Arguments::created_by_java_launcher() {
1622 assert(_sun_java_launcher != NULL, "property must have value");
1623 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1624 }
1625
1626 bool Arguments::created_by_gamma_launcher() {
1627 return _created_by_gamma_launcher;
1628 }
1629
1630 //===========================================================================================================
1631 // Parsing of main arguments
1632
1633 bool Arguments::verify_interval(uintx val, uintx min,
1634 uintx max, const char* name) {
1635 // Returns true iff value is in the inclusive interval [min..max]
1636 // false, otherwise.
1637 if (val >= min && val <= max) {
1638 return true;
1639 }
1640 jio_fprintf(defaultStream::error_stream(),
1641 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1642 " and " UINTX_FORMAT "\n",
1643 name, val, min, max);
1644 return false;
1645 }
1646
1647 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1648 // Returns true if given value is at least specified min threshold
1649 // false, otherwise.
1650 if (val >= min ) {
1651 return true;
1652 }
1653 jio_fprintf(defaultStream::error_stream(),
1654 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1655 name, val, min);
1656 return false;
1657 }
1658
1659 bool Arguments::verify_percentage(uintx value, const char* name) {
1660 if (value <= 100) {
1661 return true;
1662 }
1663 jio_fprintf(defaultStream::error_stream(),
1664 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1665 name, value);
1666 return false;
1667 }
1668
1669 static void force_serial_gc() {
1670 FLAG_SET_DEFAULT(UseSerialGC, true);
1671 FLAG_SET_DEFAULT(UseParNewGC, false);
1672 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1673 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1674 FLAG_SET_DEFAULT(UseParallelGC, false);
1675 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1676 FLAG_SET_DEFAULT(UseG1GC, false);
1677 }
1678
1679 static bool verify_serial_gc_flags() {
1680 return (UseSerialGC &&
1681 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1682 UseParallelGC || UseParallelOldGC));
1683 }
1684
1685 // check if do gclog rotation
1686 // +UseGCLogFileRotation is a must,
1687 // no gc log rotation when log file not supplied or
1688 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1689 void check_gclog_consistency() {
1690 if (UseGCLogFileRotation) {
1691 if ((Arguments::gc_log_filename() == NULL) ||
1692 (NumberOfGCLogFiles == 0) ||
1693 (GCLogFileSize == 0)) {
1694 jio_fprintf(defaultStream::output_stream(),
1695 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1696 "where num_of_file > 0 and num_of_size > 0\n"
1697 "GC log rotation is turned off\n");
1698 UseGCLogFileRotation = false;
1699 }
1700 }
1701
1702 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1703 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1704 jio_fprintf(defaultStream::output_stream(),
1705 "GCLogFileSize changed to minimum 8K\n");
1706 }
1707 }
1708
1709 // Check consistency of GC selection
1710 bool Arguments::check_gc_consistency() {
1711 check_gclog_consistency();
1712 bool status = true;
1713 // Ensure that the user has not selected conflicting sets
1714 // of collectors. [Note: this check is merely a user convenience;
1715 // collectors over-ride each other so that only a non-conflicting
1716 // set is selected; however what the user gets is not what they
1717 // may have expected from the combination they asked for. It's
1718 // better to reduce user confusion by not allowing them to
1719 // select conflicting combinations.
1720 uint i = 0;
1721 if (UseSerialGC) i++;
1722 if (UseConcMarkSweepGC || UseParNewGC) i++;
1723 if (UseParallelGC || UseParallelOldGC) i++;
1724 if (UseG1GC) i++;
1725 if (i > 1) {
1726 jio_fprintf(defaultStream::error_stream(),
1727 "Conflicting collector combinations in option list; "
1728 "please refer to the release notes for the combinations "
1729 "allowed\n");
1730 status = false;
1731 }
1732
1733 return status;
1734 }
1735
1736 // Check stack pages settings
1737 bool Arguments::check_stack_pages()
1738 {
1739 bool status = true;
1740 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1741 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1742 // greater stack shadow pages can't generate instruction to bang stack
1743 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1744 return status;
1745 }
1746
1747 // Check the consistency of vm_init_args
1748 bool Arguments::check_vm_args_consistency() {
1749 // Method for adding checks for flag consistency.
1750 // The intent is to warn the user of all possible conflicts,
1751 // before returning an error.
1752 // Note: Needs platform-dependent factoring.
1753 bool status = true;
1754
1755 #if ( (defined(COMPILER2) && defined(SPARC)))
1756 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1757 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1758 // x86. Normally, VM_Version_init must be called from init_globals in
1759 // init.cpp, which is called by the initial java thread *after* arguments
1760 // have been parsed. VM_Version_init gets called twice on sparc.
1761 extern void VM_Version_init();
1762 VM_Version_init();
1763 if (!VM_Version::has_v9()) {
1764 jio_fprintf(defaultStream::error_stream(),
1765 "V8 Machine detected, Server requires V9\n");
1766 status = false;
1767 }
1768 #endif /* COMPILER2 && SPARC */
1769
1770 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1771 // builds so the cost of stack banging can be measured.
1772 #if (defined(PRODUCT) && defined(SOLARIS))
1773 if (!UseBoundThreads && !UseStackBanging) {
1774 jio_fprintf(defaultStream::error_stream(),
1775 "-UseStackBanging conflicts with -UseBoundThreads\n");
1776
1777 status = false;
1778 }
1779 #endif
1780
1781 if (TLABRefillWasteFraction == 0) {
1782 jio_fprintf(defaultStream::error_stream(),
1783 "TLABRefillWasteFraction should be a denominator, "
1784 "not " SIZE_FORMAT "\n",
1785 TLABRefillWasteFraction);
1786 status = false;
1787 }
1788
1789 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1790 "AdaptiveSizePolicyWeight");
1791 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1792 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1793 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1794 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1795
1796 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1797 jio_fprintf(defaultStream::error_stream(),
1798 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1799 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1800 MinHeapFreeRatio, MaxHeapFreeRatio);
1801 status = false;
1802 }
1803 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1804 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1805
1806 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1807 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1808 }
1809
1810 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1811 // Settings to encourage splitting.
1812 if (!FLAG_IS_CMDLINE(NewRatio)) {
1813 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1814 }
1815 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1816 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1817 }
1818 }
1819
1820 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1821 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1822 if (GCTimeLimit == 100) {
1823 // Turn off gc-overhead-limit-exceeded checks
1824 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1825 }
1826
1827 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1828
1829 status = status && check_gc_consistency();
1830 status = status && check_stack_pages();
1831
1832 if (_has_alloc_profile) {
1833 if (UseParallelGC || UseParallelOldGC) {
1834 jio_fprintf(defaultStream::error_stream(),
1835 "error: invalid argument combination.\n"
1836 "Allocation profiling (-Xaprof) cannot be used together with "
1837 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1838 status = false;
1839 }
1840 if (UseConcMarkSweepGC) {
1841 jio_fprintf(defaultStream::error_stream(),
1842 "error: invalid argument combination.\n"
1843 "Allocation profiling (-Xaprof) cannot be used together with "
1844 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1845 status = false;
1846 }
1847 }
1848
1849 if (CMSIncrementalMode) {
1850 if (!UseConcMarkSweepGC) {
1851 jio_fprintf(defaultStream::error_stream(),
1852 "error: invalid argument combination.\n"
1853 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1854 "selected in order\nto use CMSIncrementalMode.\n");
1855 status = false;
1856 } else {
1857 status = status && verify_percentage(CMSIncrementalDutyCycle,
1858 "CMSIncrementalDutyCycle");
1859 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1860 "CMSIncrementalDutyCycleMin");
1861 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1862 "CMSIncrementalSafetyFactor");
1863 status = status && verify_percentage(CMSIncrementalOffset,
1864 "CMSIncrementalOffset");
1865 status = status && verify_percentage(CMSExpAvgFactor,
1866 "CMSExpAvgFactor");
1867 // If it was not set on the command line, set
1868 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1869 if (CMSInitiatingOccupancyFraction < 0) {
1870 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1871 }
1872 }
1873 }
1874
1875 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1876 // insists that we hold the requisite locks so that the iteration is
1877 // MT-safe. For the verification at start-up and shut-down, we don't
1878 // yet have a good way of acquiring and releasing these locks,
1879 // which are not visible at the CollectedHeap level. We want to
1880 // be able to acquire these locks and then do the iteration rather
1881 // than just disable the lock verification. This will be fixed under
1882 // bug 4788986.
1883 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1884 if (VerifyGCStartAt == 0) {
1885 warning("Heap verification at start-up disabled "
1886 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1887 VerifyGCStartAt = 1; // Disable verification at start-up
1888 }
1889 if (VerifyBeforeExit) {
1890 warning("Heap verification at shutdown disabled "
1891 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1892 VerifyBeforeExit = false; // Disable verification at shutdown
1893 }
1894 }
1895
1896 // Note: only executed in non-PRODUCT mode
1897 if (!UseAsyncConcMarkSweepGC &&
1898 (ExplicitGCInvokesConcurrent ||
1899 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1900 jio_fprintf(defaultStream::error_stream(),
1901 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1902 " with -UseAsyncConcMarkSweepGC");
1903 status = false;
1904 }
1905
1906 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
1907
1908 #ifndef SERIALGC
1909 if (UseG1GC) {
1910 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1911 "InitiatingHeapOccupancyPercent");
1912 status = status && verify_min_value(G1RefProcDrainInterval, 1,
1913 "G1RefProcDrainInterval");
1914 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
1915 "G1ConcMarkStepDurationMillis");
1916 }
1917 #endif
1918
1919 status = status && verify_interval(RefDiscoveryPolicy,
1920 ReferenceProcessor::DiscoveryPolicyMin,
1921 ReferenceProcessor::DiscoveryPolicyMax,
1922 "RefDiscoveryPolicy");
1923
1924 // Limit the lower bound of this flag to 1 as it is used in a division
1925 // expression.
1926 status = status && verify_interval(TLABWasteTargetPercent,
1927 1, 100, "TLABWasteTargetPercent");
1928
1929 status = status && verify_object_alignment();
1930
1931 return status;
1932 }
1933
1934 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1935 const char* option_type) {
1936 if (ignore) return false;
1937
1938 const char* spacer = " ";
1939 if (option_type == NULL) {
1940 option_type = ++spacer; // Set both to the empty string.
1941 }
1942
1943 if (os::obsolete_option(option)) {
1944 jio_fprintf(defaultStream::error_stream(),
1945 "Obsolete %s%soption: %s\n", option_type, spacer,
1946 option->optionString);
1947 return false;
1948 } else {
1949 jio_fprintf(defaultStream::error_stream(),
1950 "Unrecognized %s%soption: %s\n", option_type, spacer,
1951 option->optionString);
1952 return true;
1953 }
1954 }
1955
1956 static const char* user_assertion_options[] = {
1957 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1958 };
1959
1960 static const char* system_assertion_options[] = {
1961 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1962 };
1963
1964 // Return true if any of the strings in null-terminated array 'names' matches.
1965 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1966 // the option must match exactly.
1967 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1968 bool tail_allowed) {
1969 for (/* empty */; *names != NULL; ++names) {
1970 if (match_option(option, *names, tail)) {
1971 if (**tail == '\0' || tail_allowed && **tail == ':') {
1972 return true;
1973 }
1974 }
1975 }
1976 return false;
1977 }
1978
1979 bool Arguments::parse_uintx(const char* value,
1980 uintx* uintx_arg,
1981 uintx min_size) {
1982
1983 // Check the sign first since atomull() parses only unsigned values.
1984 bool value_is_positive = !(*value == '-');
1985
1986 if (value_is_positive) {
1987 julong n;
1988 bool good_return = atomull(value, &n);
1989 if (good_return) {
1990 bool above_minimum = n >= min_size;
1991 bool value_is_too_large = n > max_uintx;
1992
1993 if (above_minimum && !value_is_too_large) {
1994 *uintx_arg = n;
1995 return true;
1996 }
1997 }
1998 }
1999 return false;
2000 }
2001
2002 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2003 julong* long_arg,
2004 julong min_size) {
2005 if (!atomull(s, long_arg)) return arg_unreadable;
2006 return check_memory_size(*long_arg, min_size);
2007 }
2008
2009 // Parse JavaVMInitArgs structure
2010
2011 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2012 // For components of the system classpath.
2013 SysClassPath scp(Arguments::get_sysclasspath());
2014 bool scp_assembly_required = false;
2015
2016 // Save default settings for some mode flags
2017 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2018 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2019 Arguments::_ClipInlining = ClipInlining;
2020 Arguments::_BackgroundCompilation = BackgroundCompilation;
2021
2022 // Setup flags for mixed which is the default
2023 set_mode_flags(_mixed);
2024
2025 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2026 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2027 if (result != JNI_OK) {
2028 return result;
2029 }
2030
2031 // Parse JavaVMInitArgs structure passed in
2032 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2033 if (result != JNI_OK) {
2034 return result;
2035 }
2036
2037 if (AggressiveOpts) {
2038 // Insert alt-rt.jar between user-specified bootclasspath
2039 // prefix and the default bootclasspath. os::set_boot_path()
2040 // uses meta_index_dir as the default bootclasspath directory.
2041 const char* altclasses_jar = "alt-rt.jar";
2042 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2043 strlen(altclasses_jar);
2044 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
2045 strcpy(altclasses_path, get_meta_index_dir());
2046 strcat(altclasses_path, altclasses_jar);
2047 scp.add_suffix_to_prefix(altclasses_path);
2048 scp_assembly_required = true;
2049 FREE_C_HEAP_ARRAY(char, altclasses_path);
2050 }
2051
2052 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2053 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2054 if (result != JNI_OK) {
2055 return result;
2056 }
2057
2058 // Do final processing now that all arguments have been parsed
2059 result = finalize_vm_init_args(&scp, scp_assembly_required);
2060 if (result != JNI_OK) {
2061 return result;
2062 }
2063
2064 return JNI_OK;
2065 }
2066
2067 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2068 SysClassPath* scp_p,
2069 bool* scp_assembly_required_p,
2070 FlagValueOrigin origin) {
2071 // Remaining part of option string
2072 const char* tail;
2073
2074 // iterate over arguments
2075 for (int index = 0; index < args->nOptions; index++) {
2076 bool is_absolute_path = false; // for -agentpath vs -agentlib
2077
2078 const JavaVMOption* option = args->options + index;
2079
2080 if (!match_option(option, "-Djava.class.path", &tail) &&
2081 !match_option(option, "-Dsun.java.command", &tail) &&
2082 !match_option(option, "-Dsun.java.launcher", &tail)) {
2083
2084 // add all jvm options to the jvm_args string. This string
2085 // is used later to set the java.vm.args PerfData string constant.
2086 // the -Djava.class.path and the -Dsun.java.command options are
2087 // omitted from jvm_args string as each have their own PerfData
2088 // string constant object.
2089 build_jvm_args(option->optionString);
2090 }
2091
2092 // -verbose:[class/gc/jni]
2093 if (match_option(option, "-verbose", &tail)) {
2094 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2095 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2096 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2097 } else if (!strcmp(tail, ":gc")) {
2098 FLAG_SET_CMDLINE(bool, PrintGC, true);
2099 } else if (!strcmp(tail, ":jni")) {
2100 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2101 }
2102 // -da / -ea / -disableassertions / -enableassertions
2103 // These accept an optional class/package name separated by a colon, e.g.,
2104 // -da:java.lang.Thread.
2105 } else if (match_option(option, user_assertion_options, &tail, true)) {
2106 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2107 if (*tail == '\0') {
2108 JavaAssertions::setUserClassDefault(enable);
2109 } else {
2110 assert(*tail == ':', "bogus match by match_option()");
2111 JavaAssertions::addOption(tail + 1, enable);
2112 }
2113 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2114 } else if (match_option(option, system_assertion_options, &tail, false)) {
2115 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2116 JavaAssertions::setSystemClassDefault(enable);
2117 // -bootclasspath:
2118 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2119 scp_p->reset_path(tail);
2120 *scp_assembly_required_p = true;
2121 // -bootclasspath/a:
2122 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2123 scp_p->add_suffix(tail);
2124 *scp_assembly_required_p = true;
2125 // -bootclasspath/p:
2126 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2127 scp_p->add_prefix(tail);
2128 *scp_assembly_required_p = true;
2129 // -Xrun
2130 } else if (match_option(option, "-Xrun", &tail)) {
2131 if (tail != NULL) {
2132 const char* pos = strchr(tail, ':');
2133 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2134 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2135 name[len] = '\0';
2136
2137 char *options = NULL;
2138 if(pos != NULL) {
2139 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2140 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2141 }
2142 #ifdef JVMTI_KERNEL
2143 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2144 warning("profiling and debugging agents are not supported with Kernel VM");
2145 } else
2146 #endif // JVMTI_KERNEL
2147 add_init_library(name, options);
2148 }
2149 // -agentlib and -agentpath
2150 } else if (match_option(option, "-agentlib:", &tail) ||
2151 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2152 if(tail != NULL) {
2153 const char* pos = strchr(tail, '=');
2154 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2155 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2156 name[len] = '\0';
2157
2158 char *options = NULL;
2159 if(pos != NULL) {
2160 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2161 }
2162 #ifdef JVMTI_KERNEL
2163 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2164 warning("profiling and debugging agents are not supported with Kernel VM");
2165 } else
2166 #endif // JVMTI_KERNEL
2167 add_init_agent(name, options, is_absolute_path);
2168
2169 }
2170 // -javaagent
2171 } else if (match_option(option, "-javaagent:", &tail)) {
2172 if(tail != NULL) {
2173 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2174 add_init_agent("instrument", options, false);
2175 }
2176 // -Xnoclassgc
2177 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2178 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2179 // -Xincgc: i-CMS
2180 } else if (match_option(option, "-Xincgc", &tail)) {
2181 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2182 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2183 // -Xnoincgc: no i-CMS
2184 } else if (match_option(option, "-Xnoincgc", &tail)) {
2185 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2186 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2187 // -Xconcgc
2188 } else if (match_option(option, "-Xconcgc", &tail)) {
2189 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2190 // -Xnoconcgc
2191 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2192 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2193 // -Xbatch
2194 } else if (match_option(option, "-Xbatch", &tail)) {
2195 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2196 // -Xmn for compatibility with other JVM vendors
2197 } else if (match_option(option, "-Xmn", &tail)) {
2198 julong long_initial_eden_size = 0;
2199 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2200 if (errcode != arg_in_range) {
2201 jio_fprintf(defaultStream::error_stream(),
2202 "Invalid initial eden size: %s\n", option->optionString);
2203 describe_range_error(errcode);
2204 return JNI_EINVAL;
2205 }
2206 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2207 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2208 // -Xms
2209 } else if (match_option(option, "-Xms", &tail)) {
2210 julong long_initial_heap_size = 0;
2211 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2212 if (errcode != arg_in_range) {
2213 jio_fprintf(defaultStream::error_stream(),
2214 "Invalid initial heap size: %s\n", option->optionString);
2215 describe_range_error(errcode);
2216 return JNI_EINVAL;
2217 }
2218 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2219 // Currently the minimum size and the initial heap sizes are the same.
2220 set_min_heap_size(InitialHeapSize);
2221 // -Xmx
2222 } else if (match_option(option, "-Xmx", &tail)) {
2223 julong long_max_heap_size = 0;
2224 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2225 if (errcode != arg_in_range) {
2226 jio_fprintf(defaultStream::error_stream(),
2227 "Invalid maximum heap size: %s\n", option->optionString);
2228 describe_range_error(errcode);
2229 return JNI_EINVAL;
2230 }
2231 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2232 // Xmaxf
2233 } else if (match_option(option, "-Xmaxf", &tail)) {
2234 int maxf = (int)(atof(tail) * 100);
2235 if (maxf < 0 || maxf > 100) {
2236 jio_fprintf(defaultStream::error_stream(),
2237 "Bad max heap free percentage size: %s\n",
2238 option->optionString);
2239 return JNI_EINVAL;
2240 } else {
2241 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2242 }
2243 // Xminf
2244 } else if (match_option(option, "-Xminf", &tail)) {
2245 int minf = (int)(atof(tail) * 100);
2246 if (minf < 0 || minf > 100) {
2247 jio_fprintf(defaultStream::error_stream(),
2248 "Bad min heap free percentage size: %s\n",
2249 option->optionString);
2250 return JNI_EINVAL;
2251 } else {
2252 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2253 }
2254 // -Xss
2255 } else if (match_option(option, "-Xss", &tail)) {
2256 julong long_ThreadStackSize = 0;
2257 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2258 if (errcode != arg_in_range) {
2259 jio_fprintf(defaultStream::error_stream(),
2260 "Invalid thread stack size: %s\n", option->optionString);
2261 describe_range_error(errcode);
2262 return JNI_EINVAL;
2263 }
2264 // Internally track ThreadStackSize in units of 1024 bytes.
2265 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2266 round_to((int)long_ThreadStackSize, K) / K);
2267 // -Xoss
2268 } else if (match_option(option, "-Xoss", &tail)) {
2269 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2270 // -Xmaxjitcodesize
2271 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2272 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2273 julong long_ReservedCodeCacheSize = 0;
2274 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2275 (size_t)InitialCodeCacheSize);
2276 if (errcode != arg_in_range) {
2277 jio_fprintf(defaultStream::error_stream(),
2278 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2279 option->optionString, InitialCodeCacheSize/K);
2280 describe_range_error(errcode);
2281 return JNI_EINVAL;
2282 }
2283 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2284 // -green
2285 } else if (match_option(option, "-green", &tail)) {
2286 jio_fprintf(defaultStream::error_stream(),
2287 "Green threads support not available\n");
2288 return JNI_EINVAL;
2289 // -native
2290 } else if (match_option(option, "-native", &tail)) {
2291 // HotSpot always uses native threads, ignore silently for compatibility
2292 // -Xsqnopause
2293 } else if (match_option(option, "-Xsqnopause", &tail)) {
2294 // EVM option, ignore silently for compatibility
2295 // -Xrs
2296 } else if (match_option(option, "-Xrs", &tail)) {
2297 // Classic/EVM option, new functionality
2298 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2299 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2300 // change default internal VM signals used - lower case for back compat
2301 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2302 // -Xoptimize
2303 } else if (match_option(option, "-Xoptimize", &tail)) {
2304 // EVM option, ignore silently for compatibility
2305 // -Xprof
2306 } else if (match_option(option, "-Xprof", &tail)) {
2307 #ifndef FPROF_KERNEL
2308 _has_profile = true;
2309 #else // FPROF_KERNEL
2310 // do we have to exit?
2311 warning("Kernel VM does not support flat profiling.");
2312 #endif // FPROF_KERNEL
2313 // -Xaprof
2314 } else if (match_option(option, "-Xaprof", &tail)) {
2315 _has_alloc_profile = true;
2316 // -Xconcurrentio
2317 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2318 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2319 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2320 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2321 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2322 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2323
2324 // -Xinternalversion
2325 } else if (match_option(option, "-Xinternalversion", &tail)) {
2326 jio_fprintf(defaultStream::output_stream(), "%s\n",
2327 VM_Version::internal_vm_info_string());
2328 vm_exit(0);
2329 #ifndef PRODUCT
2330 // -Xprintflags
2331 } else if (match_option(option, "-Xprintflags", &tail)) {
2332 CommandLineFlags::printFlags();
2333 vm_exit(0);
2334 #endif
2335 // -D
2336 } else if (match_option(option, "-D", &tail)) {
2337 if (!add_property(tail)) {
2338 return JNI_ENOMEM;
2339 }
2340 // Out of the box management support
2341 if (match_option(option, "-Dcom.sun.management", &tail)) {
2342 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2343 }
2344 // -Xint
2345 } else if (match_option(option, "-Xint", &tail)) {
2346 set_mode_flags(_int);
2347 // -Xmixed
2348 } else if (match_option(option, "-Xmixed", &tail)) {
2349 set_mode_flags(_mixed);
2350 // -Xcomp
2351 } else if (match_option(option, "-Xcomp", &tail)) {
2352 // for testing the compiler; turn off all flags that inhibit compilation
2353 set_mode_flags(_comp);
2354
2355 // -Xshare:dump
2356 } else if (match_option(option, "-Xshare:dump", &tail)) {
2357 #ifdef TIERED
2358 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2359 set_mode_flags(_int); // Prevent compilation, which creates objects
2360 #elif defined(COMPILER2)
2361 vm_exit_during_initialization(
2362 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2363 #elif defined(KERNEL)
2364 vm_exit_during_initialization(
2365 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2366 #else
2367 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2368 set_mode_flags(_int); // Prevent compilation, which creates objects
2369 #endif
2370 // -Xshare:on
2371 } else if (match_option(option, "-Xshare:on", &tail)) {
2372 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2373 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2374 // -Xshare:auto
2375 } else if (match_option(option, "-Xshare:auto", &tail)) {
2376 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2377 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2378 // -Xshare:off
2379 } else if (match_option(option, "-Xshare:off", &tail)) {
2380 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2381 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2382
2383 // -Xverify
2384 } else if (match_option(option, "-Xverify", &tail)) {
2385 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2386 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2387 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2388 } else if (strcmp(tail, ":remote") == 0) {
2389 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2390 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2391 } else if (strcmp(tail, ":none") == 0) {
2392 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2393 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2394 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2395 return JNI_EINVAL;
2396 }
2397 // -Xdebug
2398 } else if (match_option(option, "-Xdebug", &tail)) {
2399 // note this flag has been used, then ignore
2400 set_xdebug_mode(true);
2401 // -Xnoagent
2402 } else if (match_option(option, "-Xnoagent", &tail)) {
2403 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2404 } else if (match_option(option, "-Xboundthreads", &tail)) {
2405 // Bind user level threads to kernel threads (Solaris only)
2406 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2407 } else if (match_option(option, "-Xloggc:", &tail)) {
2408 // Redirect GC output to the file. -Xloggc:<filename>
2409 // ostream_init_log(), when called will use this filename
2410 // to initialize a fileStream.
2411 _gc_log_filename = strdup(tail);
2412 FLAG_SET_CMDLINE(bool, PrintGC, true);
2413 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2414
2415 // JNI hooks
2416 } else if (match_option(option, "-Xcheck", &tail)) {
2417 if (!strcmp(tail, ":jni")) {
2418 CheckJNICalls = true;
2419 } else if (is_bad_option(option, args->ignoreUnrecognized,
2420 "check")) {
2421 return JNI_EINVAL;
2422 }
2423 } else if (match_option(option, "vfprintf", &tail)) {
2424 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2425 } else if (match_option(option, "exit", &tail)) {
2426 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2427 } else if (match_option(option, "abort", &tail)) {
2428 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2429 // -XX:+AggressiveHeap
2430 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2431
2432 // This option inspects the machine and attempts to set various
2433 // parameters to be optimal for long-running, memory allocation
2434 // intensive jobs. It is intended for machines with large
2435 // amounts of cpu and memory.
2436
2437 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2438 // VM, but we may not be able to represent the total physical memory
2439 // available (like having 8gb of memory on a box but using a 32bit VM).
2440 // Thus, we need to make sure we're using a julong for intermediate
2441 // calculations.
2442 julong initHeapSize;
2443 julong total_memory = os::physical_memory();
2444
2445 if (total_memory < (julong)256*M) {
2446 jio_fprintf(defaultStream::error_stream(),
2447 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2448 vm_exit(1);
2449 }
2450
2451 // The heap size is half of available memory, or (at most)
2452 // all of possible memory less 160mb (leaving room for the OS
2453 // when using ISM). This is the maximum; because adaptive sizing
2454 // is turned on below, the actual space used may be smaller.
2455
2456 initHeapSize = MIN2(total_memory / (julong)2,
2457 total_memory - (julong)160*M);
2458
2459 // Make sure that if we have a lot of memory we cap the 32 bit
2460 // process space. The 64bit VM version of this function is a nop.
2461 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2462
2463 // The perm gen is separate but contiguous with the
2464 // object heap (and is reserved with it) so subtract it
2465 // from the heap size.
2466 if (initHeapSize > MaxPermSize) {
2467 initHeapSize = initHeapSize - MaxPermSize;
2468 } else {
2469 warning("AggressiveHeap and MaxPermSize values may conflict");
2470 }
2471
2472 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2473 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2474 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2475 // Currently the minimum size and the initial heap sizes are the same.
2476 set_min_heap_size(initHeapSize);
2477 }
2478 if (FLAG_IS_DEFAULT(NewSize)) {
2479 // Make the young generation 3/8ths of the total heap.
2480 FLAG_SET_CMDLINE(uintx, NewSize,
2481 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2482 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2483 }
2484
2485 FLAG_SET_DEFAULT(UseLargePages, true);
2486
2487 // Increase some data structure sizes for efficiency
2488 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2489 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2490 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2491
2492 // See the OldPLABSize comment below, but replace 'after promotion'
2493 // with 'after copying'. YoungPLABSize is the size of the survivor
2494 // space per-gc-thread buffers. The default is 4kw.
2495 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2496
2497 // OldPLABSize is the size of the buffers in the old gen that
2498 // UseParallelGC uses to promote live data that doesn't fit in the
2499 // survivor spaces. At any given time, there's one for each gc thread.
2500 // The default size is 1kw. These buffers are rarely used, since the
2501 // survivor spaces are usually big enough. For specjbb, however, there
2502 // are occasions when there's lots of live data in the young gen
2503 // and we end up promoting some of it. We don't have a definite
2504 // explanation for why bumping OldPLABSize helps, but the theory
2505 // is that a bigger PLAB results in retaining something like the
2506 // original allocation order after promotion, which improves mutator
2507 // locality. A minor effect may be that larger PLABs reduce the
2508 // number of PLAB allocation events during gc. The value of 8kw
2509 // was arrived at by experimenting with specjbb.
2510 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2511
2512 // CompilationPolicyChoice=0 causes the server compiler to adopt
2513 // a more conservative which-method-do-I-compile policy when one
2514 // of the counters maintained by the interpreter trips. The
2515 // result is reduced startup time and improved specjbb and
2516 // alacrity performance. Zero is the default, but we set it
2517 // explicitly here in case the default changes.
2518 // See runtime/compilationPolicy.*.
2519 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2520
2521 // Enable parallel GC and adaptive generation sizing
2522 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2523 FLAG_SET_DEFAULT(ParallelGCThreads,
2524 Abstract_VM_Version::parallel_worker_threads());
2525
2526 // Encourage steady state memory management
2527 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2528
2529 // This appears to improve mutator locality
2530 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2531
2532 // Get around early Solaris scheduling bug
2533 // (affinity vs other jobs on system)
2534 // but disallow DR and offlining (5008695).
2535 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2536
2537 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2538 // The last option must always win.
2539 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2540 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2541 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2542 // The last option must always win.
2543 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2544 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2545 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2546 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2547 jio_fprintf(defaultStream::error_stream(),
2548 "Please use CMSClassUnloadingEnabled in place of "
2549 "CMSPermGenSweepingEnabled in the future\n");
2550 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2551 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2552 jio_fprintf(defaultStream::error_stream(),
2553 "Please use -XX:+UseGCOverheadLimit in place of "
2554 "-XX:+UseGCTimeLimit in the future\n");
2555 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2556 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2557 jio_fprintf(defaultStream::error_stream(),
2558 "Please use -XX:-UseGCOverheadLimit in place of "
2559 "-XX:-UseGCTimeLimit in the future\n");
2560 // The TLE options are for compatibility with 1.3 and will be
2561 // removed without notice in a future release. These options
2562 // are not to be documented.
2563 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2564 // No longer used.
2565 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2566 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2567 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2568 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2569 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2570 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2571 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2572 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2573 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2574 // No longer used.
2575 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2576 julong long_tlab_size = 0;
2577 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2578 if (errcode != arg_in_range) {
2579 jio_fprintf(defaultStream::error_stream(),
2580 "Invalid TLAB size: %s\n", option->optionString);
2581 describe_range_error(errcode);
2582 return JNI_EINVAL;
2583 }
2584 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2585 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2586 // No longer used.
2587 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2588 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2589 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2590 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2591 SOLARIS_ONLY(
2592 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2593 warning("-XX:+UsePermISM is obsolete.");
2594 FLAG_SET_CMDLINE(bool, UseISM, true);
2595 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2596 FLAG_SET_CMDLINE(bool, UseISM, false);
2597 )
2598 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2599 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2600 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2601 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2602 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2603 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2604 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2605 #ifdef SOLARIS
2606 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2607 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2608 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2609 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2610 #else // ndef SOLARIS
2611 jio_fprintf(defaultStream::error_stream(),
2612 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2613 return JNI_EINVAL;
2614 #endif // ndef SOLARIS
2615 #ifdef ASSERT
2616 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2617 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2618 // disable scavenge before parallel mark-compact
2619 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2620 #endif
2621 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &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:CMSParPromoteBlocksToClaim in the future\n");
2627 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2628 julong cms_blocks_to_claim = (julong)atol(tail);
2629 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2630 jio_fprintf(defaultStream::error_stream(),
2631 "Please use -XX:OldPLABSize in place of "
2632 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2633 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2634 julong old_plab_size = 0;
2635 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2636 if (errcode != arg_in_range) {
2637 jio_fprintf(defaultStream::error_stream(),
2638 "Invalid old PLAB size: %s\n", option->optionString);
2639 describe_range_error(errcode);
2640 return JNI_EINVAL;
2641 }
2642 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2643 jio_fprintf(defaultStream::error_stream(),
2644 "Please use -XX:OldPLABSize in place of "
2645 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2646 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2647 julong young_plab_size = 0;
2648 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2649 if (errcode != arg_in_range) {
2650 jio_fprintf(defaultStream::error_stream(),
2651 "Invalid young PLAB size: %s\n", option->optionString);
2652 describe_range_error(errcode);
2653 return JNI_EINVAL;
2654 }
2655 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2656 jio_fprintf(defaultStream::error_stream(),
2657 "Please use -XX:YoungPLABSize in place of "
2658 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2659 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2660 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2661 julong stack_size = 0;
2662 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2663 if (errcode != arg_in_range) {
2664 jio_fprintf(defaultStream::error_stream(),
2665 "Invalid mark stack size: %s\n", option->optionString);
2666 describe_range_error(errcode);
2667 return JNI_EINVAL;
2668 }
2669 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2670 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2671 julong max_stack_size = 0;
2672 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2673 if (errcode != arg_in_range) {
2674 jio_fprintf(defaultStream::error_stream(),
2675 "Invalid maximum mark stack size: %s\n",
2676 option->optionString);
2677 describe_range_error(errcode);
2678 return JNI_EINVAL;
2679 }
2680 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2681 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2682 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2683 uintx conc_threads = 0;
2684 if (!parse_uintx(tail, &conc_threads, 1)) {
2685 jio_fprintf(defaultStream::error_stream(),
2686 "Invalid concurrent threads: %s\n", option->optionString);
2687 return JNI_EINVAL;
2688 }
2689 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2690 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2691 // Skip -XX:Flags= since that case has already been handled
2692 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2693 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2694 return JNI_EINVAL;
2695 }
2696 }
2697 // Unknown option
2698 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2699 return JNI_ERR;
2700 }
2701 }
2702
2703 // Change the default value for flags which have different default values
2704 // when working with older JDKs.
2705 if (JDK_Version::current().compare_major(6) <= 0 &&
2706 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2707 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2708 }
2709 #ifdef LINUX
2710 if (JDK_Version::current().compare_major(6) <= 0 &&
2711 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2712 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2713 }
2714 #endif // LINUX
2715 return JNI_OK;
2716 }
2717
2718 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2719 // This must be done after all -D arguments have been processed.
2720 scp_p->expand_endorsed();
2721
2722 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2723 // Assemble the bootclasspath elements into the final path.
2724 Arguments::set_sysclasspath(scp_p->combined_path());
2725 }
2726
2727 // This must be done after all arguments have been processed.
2728 // java_compiler() true means set to "NONE" or empty.
2729 if (java_compiler() && !xdebug_mode()) {
2730 // For backwards compatibility, we switch to interpreted mode if
2731 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2732 // not specified.
2733 set_mode_flags(_int);
2734 }
2735 if (CompileThreshold == 0) {
2736 set_mode_flags(_int);
2737 }
2738
2739 #ifndef COMPILER2
2740 // Don't degrade server performance for footprint
2741 if (FLAG_IS_DEFAULT(UseLargePages) &&
2742 MaxHeapSize < LargePageHeapSizeThreshold) {
2743 // No need for large granularity pages w/small heaps.
2744 // Note that large pages are enabled/disabled for both the
2745 // Java heap and the code cache.
2746 FLAG_SET_DEFAULT(UseLargePages, false);
2747 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2748 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2749 }
2750
2751 // Tiered compilation is undefined with C1.
2752 TieredCompilation = false;
2753 #else
2754 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2755 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2756 }
2757 #endif
2758
2759 // If we are running in a headless jre, force java.awt.headless property
2760 // to be true unless the property has already been set.
2761 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2762 if (os::is_headless_jre()) {
2763 const char* headless = Arguments::get_property("java.awt.headless");
2764 if (headless == NULL) {
2765 char envbuffer[128];
2766 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2767 if (!add_property("java.awt.headless=true")) {
2768 return JNI_ENOMEM;
2769 }
2770 } else {
2771 char buffer[256];
2772 strcpy(buffer, "java.awt.headless=");
2773 strcat(buffer, envbuffer);
2774 if (!add_property(buffer)) {
2775 return JNI_ENOMEM;
2776 }
2777 }
2778 }
2779 }
2780
2781 if (!check_vm_args_consistency()) {
2782 return JNI_ERR;
2783 }
2784
2785 return JNI_OK;
2786 }
2787
2788 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2789 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2790 scp_assembly_required_p);
2791 }
2792
2793 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2794 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2795 scp_assembly_required_p);
2796 }
2797
2798 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2799 const int N_MAX_OPTIONS = 64;
2800 const int OPTION_BUFFER_SIZE = 1024;
2801 char buffer[OPTION_BUFFER_SIZE];
2802
2803 // The variable will be ignored if it exceeds the length of the buffer.
2804 // Don't check this variable if user has special privileges
2805 // (e.g. unix su command).
2806 if (os::getenv(name, buffer, sizeof(buffer)) &&
2807 !os::have_special_privileges()) {
2808 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2809 jio_fprintf(defaultStream::error_stream(),
2810 "Picked up %s: %s\n", name, buffer);
2811 char* rd = buffer; // pointer to the input string (rd)
2812 int i;
2813 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2814 while (isspace(*rd)) rd++; // skip whitespace
2815 if (*rd == 0) break; // we re done when the input string is read completely
2816
2817 // The output, option string, overwrites the input string.
2818 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2819 // input string (rd).
2820 char* wrt = rd;
2821
2822 options[i++].optionString = wrt; // Fill in option
2823 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2824 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2825 int quote = *rd; // matching quote to look for
2826 rd++; // don't copy open quote
2827 while (*rd != quote) { // include everything (even spaces) up until quote
2828 if (*rd == 0) { // string termination means unmatched string
2829 jio_fprintf(defaultStream::error_stream(),
2830 "Unmatched quote in %s\n", name);
2831 return JNI_ERR;
2832 }
2833 *wrt++ = *rd++; // copy to option string
2834 }
2835 rd++; // don't copy close quote
2836 } else {
2837 *wrt++ = *rd++; // copy to option string
2838 }
2839 }
2840 // Need to check if we're done before writing a NULL,
2841 // because the write could be to the byte that rd is pointing to.
2842 if (*rd++ == 0) {
2843 *wrt = 0;
2844 break;
2845 }
2846 *wrt = 0; // Zero terminate option
2847 }
2848 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2849 JavaVMInitArgs vm_args;
2850 vm_args.version = JNI_VERSION_1_2;
2851 vm_args.options = options;
2852 vm_args.nOptions = i;
2853 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2854
2855 if (PrintVMOptions) {
2856 const char* tail;
2857 for (int i = 0; i < vm_args.nOptions; i++) {
2858 const JavaVMOption *option = vm_args.options + i;
2859 if (match_option(option, "-XX:", &tail)) {
2860 logOption(tail);
2861 }
2862 }
2863 }
2864
2865 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2866 }
2867 return JNI_OK;
2868 }
2869
2870 void Arguments::set_shared_spaces_flags() {
2871 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
2872 const bool might_share = must_share || UseSharedSpaces;
2873
2874 // The string table is part of the shared archive so the size must match.
2875 if (!FLAG_IS_DEFAULT(StringTableSize)) {
2876 // Disable sharing.
2877 if (must_share) {
2878 warning("disabling shared archive %s because of non-default "
2879 "StringTableSize", DumpSharedSpaces ? "creation" : "use");
2880 }
2881 if (might_share) {
2882 FLAG_SET_DEFAULT(DumpSharedSpaces, false);
2883 FLAG_SET_DEFAULT(RequireSharedSpaces, false);
2884 FLAG_SET_DEFAULT(UseSharedSpaces, false);
2885 }
2886 return;
2887 }
2888
2889 // Check whether class data sharing settings conflict with GC, compressed oops
2890 // or page size, and fix them up. Explicit sharing options override other
2891 // settings.
2892 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
2893 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
2894 UseCompressedOops || UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
2895 if (cannot_share) {
2896 if (must_share) {
2897 warning("selecting serial gc and disabling large pages %s"
2898 "because of %s", "" LP64_ONLY("and compressed oops "),
2899 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
2900 force_serial_gc();
2901 FLAG_SET_CMDLINE(bool, UseLargePages, false);
2902 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
2903 } else {
2904 if (UseSharedSpaces && Verbose) {
2905 warning("turning off use of shared archive because of "
2906 "choice of garbage collector or large pages");
2907 }
2908 no_shared_spaces();
2909 }
2910 } else if (UseLargePages && might_share) {
2911 // Disable large pages to allow shared spaces. This is sub-optimal, since
2912 // there may not even be a shared archive to use.
2913 FLAG_SET_DEFAULT(UseLargePages, false);
2914 }
2915 }
2916
2917 // Disable options not supported in this release, with a warning if they
2918 // were explicitly requested on the command-line
2919 #define UNSUPPORTED_OPTION(opt, description) \
2920 do { \
2921 if (opt) { \
2922 if (FLAG_IS_CMDLINE(opt)) { \
2923 warning(description " is disabled in this release."); \
2924 } \
2925 FLAG_SET_DEFAULT(opt, false); \
2926 } \
2927 } while(0)
2928
2929 // Parse entry point called from JNI_CreateJavaVM
2930
2931 jint Arguments::parse(const JavaVMInitArgs* args) {
2932
2933 // Sharing support
2934 // Construct the path to the archive
2935 char jvm_path[JVM_MAXPATHLEN];
2936 os::jvm_path(jvm_path, sizeof(jvm_path));
2937 #ifdef TIERED
2938 if (strstr(jvm_path, "client") != NULL) {
2939 force_client_mode = true;
2940 }
2941 #endif // TIERED
2942 char *end = strrchr(jvm_path, *os::file_separator());
2943 if (end != NULL) *end = '\0';
2944 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2945 strlen(os::file_separator()) + 20);
2946 if (shared_archive_path == NULL) return JNI_ENOMEM;
2947 strcpy(shared_archive_path, jvm_path);
2948 strcat(shared_archive_path, os::file_separator());
2949 strcat(shared_archive_path, "classes");
2950 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2951 strcat(shared_archive_path, ".jsa");
2952 SharedArchivePath = shared_archive_path;
2953
2954 // Remaining part of option string
2955 const char* tail;
2956
2957 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2958 bool settings_file_specified = false;
2959 const char* flags_file;
2960 int index;
2961 for (index = 0; index < args->nOptions; index++) {
2962 const JavaVMOption *option = args->options + index;
2963 if (match_option(option, "-XX:Flags=", &tail)) {
2964 flags_file = tail;
2965 settings_file_specified = true;
2966 }
2967 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2968 PrintVMOptions = true;
2969 }
2970 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2971 PrintVMOptions = false;
2972 }
2973 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2974 IgnoreUnrecognizedVMOptions = true;
2975 }
2976 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2977 IgnoreUnrecognizedVMOptions = false;
2978 }
2979 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2980 CommandLineFlags::printFlags();
2981 vm_exit(0);
2982 }
2983
2984 #ifndef PRODUCT
2985 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
2986 CommandLineFlags::printFlags(true);
2987 vm_exit(0);
2988 }
2989 #endif
2990 }
2991
2992 if (IgnoreUnrecognizedVMOptions) {
2993 // uncast const to modify the flag args->ignoreUnrecognized
2994 *(jboolean*)(&args->ignoreUnrecognized) = true;
2995 }
2996
2997 // Parse specified settings file
2998 if (settings_file_specified) {
2999 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3000 return JNI_EINVAL;
3001 }
3002 }
3003
3004 // Parse default .hotspotrc settings file
3005 if (!settings_file_specified) {
3006 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3007 return JNI_EINVAL;
3008 }
3009 }
3010
3011 if (PrintVMOptions) {
3012 for (index = 0; index < args->nOptions; index++) {
3013 const JavaVMOption *option = args->options + index;
3014 if (match_option(option, "-XX:", &tail)) {
3015 logOption(tail);
3016 }
3017 }
3018 }
3019
3020 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3021 jint result = parse_vm_init_args(args);
3022 if (result != JNI_OK) {
3023 return result;
3024 }
3025
3026 #ifdef JAVASE_EMBEDDED
3027 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3028 #endif
3029
3030 #ifndef PRODUCT
3031 if (TraceBytecodesAt != 0) {
3032 TraceBytecodes = true;
3033 }
3034 if (CountCompiledCalls) {
3035 if (UseCounterDecay) {
3036 warning("UseCounterDecay disabled because CountCalls is set");
3037 UseCounterDecay = false;
3038 }
3039 }
3040 #endif // PRODUCT
3041
3042 // Transitional
3043 if (EnableMethodHandles || AnonymousClasses) {
3044 if (!EnableInvokeDynamic && !FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3045 warning("EnableMethodHandles and AnonymousClasses are obsolete. Keeping EnableInvokeDynamic disabled.");
3046 } else {
3047 EnableInvokeDynamic = true;
3048 }
3049 }
3050
3051 // JSR 292 is not supported before 1.7
3052 if (!JDK_Version::is_gte_jdk17x_version()) {
3053 if (EnableInvokeDynamic) {
3054 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3055 warning("JSR 292 is not supported before 1.7. Disabling support.");
3056 }
3057 EnableInvokeDynamic = false;
3058 }
3059 }
3060
3061 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3062 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3063 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3064 }
3065 ScavengeRootsInCode = 1;
3066 }
3067 if (!JavaObjectsInPerm && ScavengeRootsInCode == 0) {
3068 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3069 warning("forcing ScavengeRootsInCode non-zero because JavaObjectsInPerm is false");
3070 }
3071 ScavengeRootsInCode = 1;
3072 }
3073
3074 if (PrintGCDetails) {
3075 // Turn on -verbose:gc options as well
3076 PrintGC = true;
3077 }
3078
3079 // Set object alignment values.
3080 set_object_alignment();
3081
3082 #ifdef SERIALGC
3083 force_serial_gc();
3084 #endif // SERIALGC
3085 #ifdef KERNEL
3086 no_shared_spaces();
3087 #endif // KERNEL
3088
3089 // Set flags based on ergonomics.
3090 set_ergonomics_flags();
3091
3092 set_shared_spaces_flags();
3093
3094 // Check the GC selections again.
3095 if (!check_gc_consistency()) {
3096 return JNI_EINVAL;
3097 }
3098
3099 if (TieredCompilation) {
3100 set_tiered_flags();
3101 } else {
3102 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3103 if (CompilationPolicyChoice >= 2) {
3104 vm_exit_during_initialization(
3105 "Incompatible compilation policy selected", NULL);
3106 }
3107 }
3108
3109 #ifndef KERNEL
3110 // Set heap size based on available physical memory
3111 set_heap_size();
3112 // Set per-collector flags
3113 if (UseParallelGC || UseParallelOldGC) {
3114 set_parallel_gc_flags();
3115 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3116 set_cms_and_parnew_gc_flags();
3117 } else if (UseParNewGC) { // skipped if CMS is set above
3118 set_parnew_gc_flags();
3119 } else if (UseG1GC) {
3120 set_g1_gc_flags();
3121 }
3122 #endif // KERNEL
3123
3124 #ifdef SERIALGC
3125 assert(verify_serial_gc_flags(), "SerialGC unset");
3126 #endif // SERIALGC
3127
3128 // Set bytecode rewriting flags
3129 set_bytecode_flags();
3130
3131 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3132 set_aggressive_opts_flags();
3133
3134 // Turn off biased locking for locking debug mode flags,
3135 // which are subtlely different from each other but neither works with
3136 // biased locking.
3137 if (UseHeavyMonitors
3138 #ifdef COMPILER1
3139 || !UseFastLocking
3140 #endif // COMPILER1
3141 ) {
3142 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3143 // flag set to true on command line; warn the user that they
3144 // can't enable biased locking here
3145 warning("Biased Locking is not supported with locking debug flags"
3146 "; ignoring UseBiasedLocking flag." );
3147 }
3148 UseBiasedLocking = false;
3149 }
3150
3151 #ifdef CC_INTERP
3152 // Clear flags not supported by the C++ interpreter
3153 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3154 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3155 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3156 #endif // CC_INTERP
3157
3158 #ifdef COMPILER2
3159 if (!UseBiasedLocking || EmitSync != 0) {
3160 UseOptoBiasInlining = false;
3161 }
3162 #endif
3163
3164 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3165 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3166 DebugNonSafepoints = true;
3167 }
3168
3169 #ifndef PRODUCT
3170 if (CompileTheWorld) {
3171 // Force NmethodSweeper to sweep whole CodeCache each time.
3172 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3173 NmethodSweepFraction = 1;
3174 }
3175 }
3176 #endif
3177
3178 if (PrintCommandLineFlags) {
3179 CommandLineFlags::printSetFlags();
3180 }
3181
3182 // Apply CPU specific policy for the BiasedLocking
3183 if (UseBiasedLocking) {
3184 if (!VM_Version::use_biased_locking() &&
3185 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3186 UseBiasedLocking = false;
3187 }
3188 }
3189
3190 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3191 // but only if not already set on the commandline
3192 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3193 bool set = false;
3194 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3195 if (!set) {
3196 FLAG_SET_DEFAULT(PauseAtExit, true);
3197 }
3198 }
3199
3200 return JNI_OK;
3201 }
3202
3203 int Arguments::PropertyList_count(SystemProperty* pl) {
3204 int count = 0;
3205 while(pl != NULL) {
3206 count++;
3207 pl = pl->next();
3208 }
3209 return count;
3210 }
3211
3212 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3213 assert(key != NULL, "just checking");
3214 SystemProperty* prop;
3215 for (prop = pl; prop != NULL; prop = prop->next()) {
3216 if (strcmp(key, prop->key()) == 0) return prop->value();
3217 }
3218 return NULL;
3219 }
3220
3221 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3222 int count = 0;
3223 const char* ret_val = NULL;
3224
3225 while(pl != NULL) {
3226 if(count >= index) {
3227 ret_val = pl->key();
3228 break;
3229 }
3230 count++;
3231 pl = pl->next();
3232 }
3233
3234 return ret_val;
3235 }
3236
3237 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3238 int count = 0;
3239 char* ret_val = NULL;
3240
3241 while(pl != NULL) {
3242 if(count >= index) {
3243 ret_val = pl->value();
3244 break;
3245 }
3246 count++;
3247 pl = pl->next();
3248 }
3249
3250 return ret_val;
3251 }
3252
3253 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3254 SystemProperty* p = *plist;
3255 if (p == NULL) {
3256 *plist = new_p;
3257 } else {
3258 while (p->next() != NULL) {
3259 p = p->next();
3260 }
3261 p->set_next(new_p);
3262 }
3263 }
3264
3265 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3266 if (plist == NULL)
3267 return;
3268
3269 SystemProperty* new_p = new SystemProperty(k, v, true);
3270 PropertyList_add(plist, new_p);
3271 }
3272
3273 // This add maintains unique property key in the list.
3274 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3275 if (plist == NULL)
3276 return;
3277
3278 // If property key exist then update with new value.
3279 SystemProperty* prop;
3280 for (prop = *plist; prop != NULL; prop = prop->next()) {
3281 if (strcmp(k, prop->key()) == 0) {
3282 if (append) {
3283 prop->append_value(v);
3284 } else {
3285 prop->set_value(v);
3286 }
3287 return;
3288 }
3289 }
3290
3291 PropertyList_add(plist, k, v);
3292 }
3293
3294 #ifdef KERNEL
3295 char *Arguments::get_kernel_properties() {
3296 // Find properties starting with kernel and append them to string
3297 // We need to find out how long they are first because the URL's that they
3298 // might point to could get long.
3299 int length = 0;
3300 SystemProperty* prop;
3301 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3302 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3303 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3304 }
3305 }
3306 // Add one for null terminator.
3307 char *props = AllocateHeap(length + 1, "get_kernel_properties");
3308 if (length != 0) {
3309 int pos = 0;
3310 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3311 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3312 jio_snprintf(&props[pos], length-pos,
3313 "-D%s=%s ", prop->key(), prop->value());
3314 pos = strlen(props);
3315 }
3316 }
3317 }
3318 // null terminate props in case of null
3319 props[length] = '\0';
3320 return props;
3321 }
3322 #endif // KERNEL
3323
3324 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3325 // Returns true if all of the source pointed by src has been copied over to
3326 // the destination buffer pointed by buf. Otherwise, returns false.
3327 // Notes:
3328 // 1. If the length (buflen) of the destination buffer excluding the
3329 // NULL terminator character is not long enough for holding the expanded
3330 // pid characters, it also returns false instead of returning the partially
3331 // expanded one.
3332 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3333 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3334 char* buf, size_t buflen) {
3335 const char* p = src;
3336 char* b = buf;
3337 const char* src_end = &src[srclen];
3338 char* buf_end = &buf[buflen - 1];
3339
3340 while (p < src_end && b < buf_end) {
3341 if (*p == '%') {
3342 switch (*(++p)) {
3343 case '%': // "%%" ==> "%"
3344 *b++ = *p++;
3345 break;
3346 case 'p': { // "%p" ==> current process id
3347 // buf_end points to the character before the last character so
3348 // that we could write '\0' to the end of the buffer.
3349 size_t buf_sz = buf_end - b + 1;
3350 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3351
3352 // if jio_snprintf fails or the buffer is not long enough to hold
3353 // the expanded pid, returns false.
3354 if (ret < 0 || ret >= (int)buf_sz) {
3355 return false;
3356 } else {
3357 b += ret;
3358 assert(*b == '\0', "fail in copy_expand_pid");
3359 if (p == src_end && b == buf_end + 1) {
3360 // reach the end of the buffer.
3361 return true;
3362 }
3363 }
3364 p++;
3365 break;
3366 }
3367 default :
3368 *b++ = '%';
3369 }
3370 } else {
3371 *b++ = *p++;
3372 }
3373 }
3374 *b = '\0';
3375 return (p == src_end); // return false if not all of the source was copied
3376 }