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_ARCH_x86
41 # include "vm_version_x86.hpp"
42 #endif
43 #ifdef TARGET_ARCH_sparc
44 # include "vm_version_sparc.hpp"
45 #endif
46 #ifdef TARGET_ARCH_zero
47 # include "vm_version_zero.hpp"
48 #endif
49 #ifdef TARGET_OS_FAMILY_linux
50 # include "os_linux.inline.hpp"
51 #endif
52 #ifdef TARGET_OS_FAMILY_solaris
53 # include "os_solaris.inline.hpp"
54 #endif
55 #ifdef TARGET_OS_FAMILY_windows
56 # include "os_windows.inline.hpp"
57 #endif
58 #ifndef SERIALGC
59 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
60 #endif
61
62 #define DEFAULT_VENDOR_URL_BUG "http://java.sun.com/webapps/bugreport/crash.jsp"
63 #define DEFAULT_JAVA_LAUNCHER "generic"
64
65 char** Arguments::_jvm_flags_array = NULL;
66 int Arguments::_num_jvm_flags = 0;
67 char** Arguments::_jvm_args_array = NULL;
68 int Arguments::_num_jvm_args = 0;
69 char* Arguments::_java_command = NULL;
70 SystemProperty* Arguments::_system_properties = NULL;
71 const char* Arguments::_gc_log_filename = NULL;
72 bool Arguments::_has_profile = false;
73 bool Arguments::_has_alloc_profile = false;
74 uintx Arguments::_min_heap_size = 0;
75 Arguments::Mode Arguments::_mode = _mixed;
76 bool Arguments::_java_compiler = false;
77 bool Arguments::_xdebug_mode = false;
78 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
79 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
80 int Arguments::_sun_java_launcher_pid = -1;
81 bool Arguments::_created_by_gamma_launcher = false;
82
83 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
84 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
85 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
86 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
87 bool Arguments::_ClipInlining = ClipInlining;
88
89 char* Arguments::SharedArchivePath = NULL;
90
91 AgentLibraryList Arguments::_libraryList;
92 AgentLibraryList Arguments::_agentList;
93
94 abort_hook_t Arguments::_abort_hook = NULL;
95 exit_hook_t Arguments::_exit_hook = NULL;
96 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
97
98
99 SystemProperty *Arguments::_java_ext_dirs = NULL;
100 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
101 SystemProperty *Arguments::_sun_boot_library_path = NULL;
102 SystemProperty *Arguments::_java_library_path = NULL;
103 SystemProperty *Arguments::_java_home = NULL;
104 SystemProperty *Arguments::_java_class_path = NULL;
105 SystemProperty *Arguments::_sun_boot_class_path = NULL;
106
107 char* Arguments::_meta_index_path = NULL;
108 char* Arguments::_meta_index_dir = NULL;
109
110 static bool force_client_mode = false;
111
112 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
113
114 static bool match_option(const JavaVMOption *option, const char* name,
115 const char** tail) {
116 int len = (int)strlen(name);
117 if (strncmp(option->optionString, name, len) == 0) {
118 *tail = option->optionString + len;
119 return true;
120 } else {
121 return false;
122 }
123 }
124
125 static void logOption(const char* opt) {
126 if (PrintVMOptions) {
127 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
128 }
129 }
130
131 // Process java launcher properties.
132 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
133 // See if sun.java.launcher or sun.java.launcher.pid is defined.
134 // Must do this before setting up other system properties,
135 // as some of them may depend on launcher type.
136 for (int index = 0; index < args->nOptions; index++) {
137 const JavaVMOption* option = args->options + index;
138 const char* tail;
139
140 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
141 process_java_launcher_argument(tail, option->extraInfo);
142 continue;
143 }
144 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
145 _sun_java_launcher_pid = atoi(tail);
146 continue;
147 }
148 }
149 }
150
151 // Initialize system properties key and value.
152 void Arguments::init_system_properties() {
153
154 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
155 "Java Virtual Machine Specification", false));
156 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
157 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
158 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
159
160 // following are JVMTI agent writeable properties.
161 // Properties values are set to NULL and they are
162 // os specific they are initialized in os::init_system_properties_values().
163 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
164 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
165 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
166 _java_library_path = new SystemProperty("java.library.path", NULL, true);
167 _java_home = new SystemProperty("java.home", NULL, true);
168 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
169
170 _java_class_path = new SystemProperty("java.class.path", "", true);
171
172 // Add to System Property list.
173 PropertyList_add(&_system_properties, _java_ext_dirs);
174 PropertyList_add(&_system_properties, _java_endorsed_dirs);
175 PropertyList_add(&_system_properties, _sun_boot_library_path);
176 PropertyList_add(&_system_properties, _java_library_path);
177 PropertyList_add(&_system_properties, _java_home);
178 PropertyList_add(&_system_properties, _java_class_path);
179 PropertyList_add(&_system_properties, _sun_boot_class_path);
180
181 // Set OS specific system properties values
182 os::init_system_properties_values();
183 }
184
185
186 // Update/Initialize System properties after JDK version number is known
187 void Arguments::init_version_specific_system_properties() {
188 enum { bufsz = 16 };
189 char buffer[bufsz];
190 const char* spec_vendor = "Sun Microsystems Inc.";
191 uint32_t spec_version = 0;
192
193 if (JDK_Version::is_gte_jdk17x_version()) {
194 spec_vendor = "Oracle Corporation";
195 spec_version = JDK_Version::current().major_version();
196 }
197 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
198
199 PropertyList_add(&_system_properties,
200 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
201 PropertyList_add(&_system_properties,
202 new SystemProperty("java.vm.specification.version", buffer, false));
203 PropertyList_add(&_system_properties,
204 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
205 }
206
207 /**
208 * Provide a slightly more user-friendly way of eliminating -XX flags.
209 * When a flag is eliminated, it can be added to this list in order to
210 * continue accepting this flag on the command-line, while issuing a warning
211 * and ignoring the value. Once the JDK version reaches the 'accept_until'
212 * limit, we flatly refuse to admit the existence of the flag. This allows
213 * a flag to die correctly over JDK releases using HSX.
214 */
215 typedef struct {
216 const char* name;
217 JDK_Version obsoleted_in; // when the flag went away
218 JDK_Version accept_until; // which version to start denying the existence
219 } ObsoleteFlag;
220
221 static ObsoleteFlag obsolete_jvm_flags[] = {
222 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
230 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
231 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
232 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
233 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
234 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
235 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
236 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
237 { "DefaultInitialRAMFraction",
238 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
239 { "UseDepthFirstScavengeOrder",
240 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
241 { "HandlePromotionFailure",
242 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
243 { "MaxLiveObjectEvacuationRatio",
244 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
245 { NULL, JDK_Version(0), JDK_Version(0) }
246 };
247
248 // Returns true if the flag is obsolete and fits into the range specified
249 // for being ignored. In the case that the flag is ignored, the 'version'
250 // value is filled in with the version number when the flag became
251 // obsolete so that that value can be displayed to the user.
252 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
253 int i = 0;
254 assert(version != NULL, "Must provide a version buffer");
255 while (obsolete_jvm_flags[i].name != NULL) {
256 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
257 // <flag>=xxx form
258 // [-|+]<flag> form
259 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
260 ((s[0] == '+' || s[0] == '-') &&
261 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
262 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
263 *version = flag_status.obsoleted_in;
264 return true;
265 }
266 }
267 i++;
268 }
269 return false;
270 }
271
272 // Constructs the system class path (aka boot class path) from the following
273 // components, in order:
274 //
275 // prefix // from -Xbootclasspath/p:...
276 // endorsed // the expansion of -Djava.endorsed.dirs=...
277 // base // from os::get_system_properties() or -Xbootclasspath=
278 // suffix // from -Xbootclasspath/a:...
279 //
280 // java.endorsed.dirs is a list of directories; any jar or zip files in the
281 // directories are added to the sysclasspath just before the base.
282 //
283 // This could be AllStatic, but it isn't needed after argument processing is
284 // complete.
285 class SysClassPath: public StackObj {
286 public:
287 SysClassPath(const char* base);
288 ~SysClassPath();
289
290 inline void set_base(const char* base);
291 inline void add_prefix(const char* prefix);
292 inline void add_suffix_to_prefix(const char* suffix);
293 inline void add_suffix(const char* suffix);
294 inline void reset_path(const char* base);
295
296 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
297 // property. Must be called after all command-line arguments have been
298 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
299 // combined_path().
300 void expand_endorsed();
301
302 inline const char* get_base() const { return _items[_scp_base]; }
303 inline const char* get_prefix() const { return _items[_scp_prefix]; }
304 inline const char* get_suffix() const { return _items[_scp_suffix]; }
305 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
306
307 // Combine all the components into a single c-heap-allocated string; caller
308 // must free the string if/when no longer needed.
309 char* combined_path();
310
311 private:
312 // Utility routines.
313 static char* add_to_path(const char* path, const char* str, bool prepend);
314 static char* add_jars_to_path(char* path, const char* directory);
315
316 inline void reset_item_at(int index);
317
318 // Array indices for the items that make up the sysclasspath. All except the
319 // base are allocated in the C heap and freed by this class.
320 enum {
321 _scp_prefix, // from -Xbootclasspath/p:...
322 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
323 _scp_base, // the default sysclasspath
324 _scp_suffix, // from -Xbootclasspath/a:...
325 _scp_nitems // the number of items, must be last.
326 };
327
328 const char* _items[_scp_nitems];
329 DEBUG_ONLY(bool _expansion_done;)
330 };
331
332 SysClassPath::SysClassPath(const char* base) {
333 memset(_items, 0, sizeof(_items));
334 _items[_scp_base] = base;
335 DEBUG_ONLY(_expansion_done = false;)
336 }
337
338 SysClassPath::~SysClassPath() {
339 // Free everything except the base.
340 for (int i = 0; i < _scp_nitems; ++i) {
341 if (i != _scp_base) reset_item_at(i);
342 }
343 DEBUG_ONLY(_expansion_done = false;)
344 }
345
346 inline void SysClassPath::set_base(const char* base) {
347 _items[_scp_base] = base;
348 }
349
350 inline void SysClassPath::add_prefix(const char* prefix) {
351 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
352 }
353
354 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
355 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
356 }
357
358 inline void SysClassPath::add_suffix(const char* suffix) {
359 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
360 }
361
362 inline void SysClassPath::reset_item_at(int index) {
363 assert(index < _scp_nitems && index != _scp_base, "just checking");
364 if (_items[index] != NULL) {
365 FREE_C_HEAP_ARRAY(char, _items[index]);
366 _items[index] = NULL;
367 }
368 }
369
370 inline void SysClassPath::reset_path(const char* base) {
371 // Clear the prefix and suffix.
372 reset_item_at(_scp_prefix);
373 reset_item_at(_scp_suffix);
374 set_base(base);
375 }
376
377 //------------------------------------------------------------------------------
378
379 void SysClassPath::expand_endorsed() {
380 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
381
382 const char* path = Arguments::get_property("java.endorsed.dirs");
383 if (path == NULL) {
384 path = Arguments::get_endorsed_dir();
385 assert(path != NULL, "no default for java.endorsed.dirs");
386 }
387
388 char* expanded_path = NULL;
389 const char separator = *os::path_separator();
390 const char* const end = path + strlen(path);
391 while (path < end) {
392 const char* tmp_end = strchr(path, separator);
393 if (tmp_end == NULL) {
394 expanded_path = add_jars_to_path(expanded_path, path);
395 path = end;
396 } else {
397 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
398 memcpy(dirpath, path, tmp_end - path);
399 dirpath[tmp_end - path] = '\0';
400 expanded_path = add_jars_to_path(expanded_path, dirpath);
401 FREE_C_HEAP_ARRAY(char, dirpath);
402 path = tmp_end + 1;
403 }
404 }
405 _items[_scp_endorsed] = expanded_path;
406 DEBUG_ONLY(_expansion_done = true;)
407 }
408
409 // Combine the bootclasspath elements, some of which may be null, into a single
410 // c-heap-allocated string.
411 char* SysClassPath::combined_path() {
412 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
413 assert(_expansion_done, "must call expand_endorsed() first.");
414
415 size_t lengths[_scp_nitems];
416 size_t total_len = 0;
417
418 const char separator = *os::path_separator();
419
420 // Get the lengths.
421 int i;
422 for (i = 0; i < _scp_nitems; ++i) {
423 if (_items[i] != NULL) {
424 lengths[i] = strlen(_items[i]);
425 // Include space for the separator char (or a NULL for the last item).
426 total_len += lengths[i] + 1;
427 }
428 }
429 assert(total_len > 0, "empty sysclasspath not allowed");
430
431 // Copy the _items to a single string.
432 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
433 char* cp_tmp = cp;
434 for (i = 0; i < _scp_nitems; ++i) {
435 if (_items[i] != NULL) {
436 memcpy(cp_tmp, _items[i], lengths[i]);
437 cp_tmp += lengths[i];
438 *cp_tmp++ = separator;
439 }
440 }
441 *--cp_tmp = '\0'; // Replace the extra separator.
442 return cp;
443 }
444
445 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
446 char*
447 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
448 char *cp;
449
450 assert(str != NULL, "just checking");
451 if (path == NULL) {
452 size_t len = strlen(str) + 1;
453 cp = NEW_C_HEAP_ARRAY(char, len);
454 memcpy(cp, str, len); // copy the trailing null
455 } else {
456 const char separator = *os::path_separator();
457 size_t old_len = strlen(path);
458 size_t str_len = strlen(str);
459 size_t len = old_len + str_len + 2;
460
461 if (prepend) {
462 cp = NEW_C_HEAP_ARRAY(char, len);
463 char* cp_tmp = cp;
464 memcpy(cp_tmp, str, str_len);
465 cp_tmp += str_len;
466 *cp_tmp = separator;
467 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
468 FREE_C_HEAP_ARRAY(char, path);
469 } else {
470 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
471 char* cp_tmp = cp + old_len;
472 *cp_tmp = separator;
473 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
474 }
475 }
476 return cp;
477 }
478
479 // Scan the directory and append any jar or zip files found to path.
480 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
481 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
482 DIR* dir = os::opendir(directory);
483 if (dir == NULL) return path;
484
485 char dir_sep[2] = { '\0', '\0' };
486 size_t directory_len = strlen(directory);
487 const char fileSep = *os::file_separator();
488 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
489
490 /* Scan the directory for jars/zips, appending them to path. */
491 struct dirent *entry;
492 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
493 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
494 const char* name = entry->d_name;
495 const char* ext = name + strlen(name) - 4;
496 bool isJarOrZip = ext > name &&
497 (os::file_name_strcmp(ext, ".jar") == 0 ||
498 os::file_name_strcmp(ext, ".zip") == 0);
499 if (isJarOrZip) {
500 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
501 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
502 path = add_to_path(path, jarpath, false);
503 FREE_C_HEAP_ARRAY(char, jarpath);
504 }
505 }
506 FREE_C_HEAP_ARRAY(char, dbuf);
507 os::closedir(dir);
508 return path;
509 }
510
511 // Parses a memory size specification string.
512 static bool atomull(const char *s, julong* result) {
513 julong n = 0;
514 int args_read = sscanf(s, os::julong_format_specifier(), &n);
515 if (args_read != 1) {
516 return false;
517 }
518 while (*s != '\0' && isdigit(*s)) {
519 s++;
520 }
521 // 4705540: illegal if more characters are found after the first non-digit
522 if (strlen(s) > 1) {
523 return false;
524 }
525 switch (*s) {
526 case 'T': case 't':
527 *result = n * G * K;
528 // Check for overflow.
529 if (*result/((julong)G * K) != n) return false;
530 return true;
531 case 'G': case 'g':
532 *result = n * G;
533 if (*result/G != n) return false;
534 return true;
535 case 'M': case 'm':
536 *result = n * M;
537 if (*result/M != n) return false;
538 return true;
539 case 'K': case 'k':
540 *result = n * K;
541 if (*result/K != n) return false;
542 return true;
543 case '\0':
544 *result = n;
545 return true;
546 default:
547 return false;
548 }
549 }
550
551 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
552 if (size < min_size) return arg_too_small;
553 // Check that size will fit in a size_t (only relevant on 32-bit)
554 if (size > max_uintx) return arg_too_big;
555 return arg_in_range;
556 }
557
558 // Describe an argument out of range error
559 void Arguments::describe_range_error(ArgsRange errcode) {
560 switch(errcode) {
561 case arg_too_big:
562 jio_fprintf(defaultStream::error_stream(),
563 "The specified size exceeds the maximum "
564 "representable size.\n");
565 break;
566 case arg_too_small:
567 case arg_unreadable:
568 case arg_in_range:
569 // do nothing for now
570 break;
571 default:
572 ShouldNotReachHere();
573 }
574 }
575
576 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
577 return CommandLineFlags::boolAtPut(name, &value, origin);
578 }
579
580 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
581 double v;
582 if (sscanf(value, "%lf", &v) != 1) {
583 return false;
584 }
585
586 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
587 return true;
588 }
589 return false;
590 }
591
592 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
593 julong v;
594 intx intx_v;
595 bool is_neg = false;
596 // Check the sign first since atomull() parses only unsigned values.
597 if (*value == '-') {
598 if (!CommandLineFlags::intxAt(name, &intx_v)) {
599 return false;
600 }
601 value++;
602 is_neg = true;
603 }
604 if (!atomull(value, &v)) {
605 return false;
606 }
607 intx_v = (intx) v;
608 if (is_neg) {
609 intx_v = -intx_v;
610 }
611 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
612 return true;
613 }
614 uintx uintx_v = (uintx) v;
615 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
616 return true;
617 }
618 uint64_t uint64_t_v = (uint64_t) v;
619 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
620 return true;
621 }
622 return false;
623 }
624
625 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
626 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
627 // Contract: CommandLineFlags always returns a pointer that needs freeing.
628 FREE_C_HEAP_ARRAY(char, value);
629 return true;
630 }
631
632 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
633 const char* old_value = "";
634 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
635 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
636 size_t new_len = strlen(new_value);
637 const char* value;
638 char* free_this_too = NULL;
639 if (old_len == 0) {
640 value = new_value;
641 } else if (new_len == 0) {
642 value = old_value;
643 } else {
644 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
645 // each new setting adds another LINE to the switch:
646 sprintf(buf, "%s\n%s", old_value, new_value);
647 value = buf;
648 free_this_too = buf;
649 }
650 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
651 // CommandLineFlags always returns a pointer that needs freeing.
652 FREE_C_HEAP_ARRAY(char, value);
653 if (free_this_too != NULL) {
654 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
655 FREE_C_HEAP_ARRAY(char, free_this_too);
656 }
657 return true;
658 }
659
660 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
661
662 // range of acceptable characters spelled out for portability reasons
663 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
664 #define BUFLEN 255
665 char name[BUFLEN+1];
666 char dummy;
667
668 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
669 return set_bool_flag(name, false, origin);
670 }
671 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
672 return set_bool_flag(name, true, origin);
673 }
674
675 char punct;
676 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
677 const char* value = strchr(arg, '=') + 1;
678 Flag* flag = Flag::find_flag(name, strlen(name));
679 if (flag != NULL && flag->is_ccstr()) {
680 if (flag->ccstr_accumulates()) {
681 return append_to_string_flag(name, value, origin);
682 } else {
683 if (value[0] == '\0') {
684 value = NULL;
685 }
686 return set_string_flag(name, value, origin);
687 }
688 }
689 }
690
691 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
692 const char* value = strchr(arg, '=') + 1;
693 // -XX:Foo:=xxx will reset the string flag to the given value.
694 if (value[0] == '\0') {
695 value = NULL;
696 }
697 return set_string_flag(name, value, origin);
698 }
699
700 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
701 #define SIGNED_NUMBER_RANGE "[-0123456789]"
702 #define NUMBER_RANGE "[0123456789]"
703 char value[BUFLEN + 1];
704 char value2[BUFLEN + 1];
705 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
706 // Looks like a floating-point number -- try again with more lenient format string
707 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
708 return set_fp_numeric_flag(name, value, origin);
709 }
710 }
711
712 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
713 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
714 return set_numeric_flag(name, value, origin);
715 }
716
717 return false;
718 }
719
720 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
721 assert(bldarray != NULL, "illegal argument");
722
723 if (arg == NULL) {
724 return;
725 }
726
727 int index = *count;
728
729 // expand the array and add arg to the last element
730 (*count)++;
731 if (*bldarray == NULL) {
732 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
733 } else {
734 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
735 }
736 (*bldarray)[index] = strdup(arg);
737 }
738
739 void Arguments::build_jvm_args(const char* arg) {
740 add_string(&_jvm_args_array, &_num_jvm_args, arg);
741 }
742
743 void Arguments::build_jvm_flags(const char* arg) {
744 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
745 }
746
747 // utility function to return a string that concatenates all
748 // strings in a given char** array
749 const char* Arguments::build_resource_string(char** args, int count) {
750 if (args == NULL || count == 0) {
751 return NULL;
752 }
753 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
754 for (int i = 1; i < count; i++) {
755 length += strlen(args[i]) + 1; // add 1 for a space
756 }
757 char* s = NEW_RESOURCE_ARRAY(char, length);
758 strcpy(s, args[0]);
759 for (int j = 1; j < count; j++) {
760 strcat(s, " ");
761 strcat(s, args[j]);
762 }
763 return (const char*) s;
764 }
765
766 void Arguments::print_on(outputStream* st) {
767 st->print_cr("VM Arguments:");
768 if (num_jvm_flags() > 0) {
769 st->print("jvm_flags: "); print_jvm_flags_on(st);
770 }
771 if (num_jvm_args() > 0) {
772 st->print("jvm_args: "); print_jvm_args_on(st);
773 }
774 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
775 st->print_cr("Launcher Type: %s", _sun_java_launcher);
776 }
777
778 void Arguments::print_jvm_flags_on(outputStream* st) {
779 if (_num_jvm_flags > 0) {
780 for (int i=0; i < _num_jvm_flags; i++) {
781 st->print("%s ", _jvm_flags_array[i]);
782 }
783 st->print_cr("");
784 }
785 }
786
787 void Arguments::print_jvm_args_on(outputStream* st) {
788 if (_num_jvm_args > 0) {
789 for (int i=0; i < _num_jvm_args; i++) {
790 st->print("%s ", _jvm_args_array[i]);
791 }
792 st->print_cr("");
793 }
794 }
795
796 bool Arguments::process_argument(const char* arg,
797 jboolean ignore_unrecognized, FlagValueOrigin origin) {
798
799 JDK_Version since = JDK_Version();
800
801 if (parse_argument(arg, origin)) {
802 // do nothing
803 } else if (is_newly_obsolete(arg, &since)) {
804 enum { bufsize = 256 };
805 char buffer[bufsize];
806 since.to_string(buffer, bufsize);
807 jio_fprintf(defaultStream::error_stream(),
808 "Warning: The flag %s has been EOL'd as of %s and will"
809 " be ignored\n", arg, buffer);
810 } else {
811 if (!ignore_unrecognized) {
812 jio_fprintf(defaultStream::error_stream(),
813 "Unrecognized VM option '%s'\n", arg);
814 // allow for commandline "commenting out" options like -XX:#+Verbose
815 if (strlen(arg) == 0 || arg[0] != '#') {
816 return false;
817 }
818 }
819 }
820 return true;
821 }
822
823 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
824 FILE* stream = fopen(file_name, "rb");
825 if (stream == NULL) {
826 if (should_exist) {
827 jio_fprintf(defaultStream::error_stream(),
828 "Could not open settings file %s\n", file_name);
829 return false;
830 } else {
831 return true;
832 }
833 }
834
835 char token[1024];
836 int pos = 0;
837
838 bool in_white_space = true;
839 bool in_comment = false;
840 bool in_quote = false;
841 char quote_c = 0;
842 bool result = true;
843
844 int c = getc(stream);
845 while(c != EOF) {
846 if (in_white_space) {
847 if (in_comment) {
848 if (c == '\n') in_comment = false;
849 } else {
850 if (c == '#') in_comment = true;
851 else if (!isspace(c)) {
852 in_white_space = false;
853 token[pos++] = c;
854 }
855 }
856 } else {
857 if (c == '\n' || (!in_quote && isspace(c))) {
858 // token ends at newline, or at unquoted whitespace
859 // this allows a way to include spaces in string-valued options
860 token[pos] = '\0';
861 logOption(token);
862 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
863 build_jvm_flags(token);
864 pos = 0;
865 in_white_space = true;
866 in_quote = false;
867 } else if (!in_quote && (c == '\'' || c == '"')) {
868 in_quote = true;
869 quote_c = c;
870 } else if (in_quote && (c == quote_c)) {
871 in_quote = false;
872 } else {
873 token[pos++] = c;
874 }
875 }
876 c = getc(stream);
877 }
878 if (pos > 0) {
879 token[pos] = '\0';
880 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
881 build_jvm_flags(token);
882 }
883 fclose(stream);
884 return result;
885 }
886
887 //=============================================================================================================
888 // Parsing of properties (-D)
889
890 const char* Arguments::get_property(const char* key) {
891 return PropertyList_get_value(system_properties(), key);
892 }
893
894 bool Arguments::add_property(const char* prop) {
895 const char* eq = strchr(prop, '=');
896 char* key;
897 // ns must be static--its address may be stored in a SystemProperty object.
898 const static char ns[1] = {0};
899 char* value = (char *)ns;
900
901 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
902 key = AllocateHeap(key_len + 1, "add_property");
903 strncpy(key, prop, key_len);
904 key[key_len] = '\0';
905
906 if (eq != NULL) {
907 size_t value_len = strlen(prop) - key_len - 1;
908 value = AllocateHeap(value_len + 1, "add_property");
909 strncpy(value, &prop[key_len + 1], value_len + 1);
910 }
911
912 if (strcmp(key, "java.compiler") == 0) {
913 process_java_compiler_argument(value);
914 FreeHeap(key);
915 if (eq != NULL) {
916 FreeHeap(value);
917 }
918 return true;
919 } else if (strcmp(key, "sun.java.command") == 0) {
920 _java_command = value;
921
922 // Record value in Arguments, but let it get passed to Java.
923 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
924 // launcher.pid property is private and is processed
925 // in process_sun_java_launcher_properties();
926 // the sun.java.launcher property is passed on to the java application
927 FreeHeap(key);
928 if (eq != NULL) {
929 FreeHeap(value);
930 }
931 return true;
932 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
933 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
934 // its value without going through the property list or making a Java call.
935 _java_vendor_url_bug = value;
936 } else if (strcmp(key, "sun.boot.library.path") == 0) {
937 PropertyList_unique_add(&_system_properties, key, value, true);
938 return true;
939 }
940 // Create new property and add at the end of the list
941 PropertyList_unique_add(&_system_properties, key, value);
942 return true;
943 }
944
945 //===========================================================================================================
946 // Setting int/mixed/comp mode flags
947
948 void Arguments::set_mode_flags(Mode mode) {
949 // Set up default values for all flags.
950 // If you add a flag to any of the branches below,
951 // add a default value for it here.
952 set_java_compiler(false);
953 _mode = mode;
954
955 // Ensure Agent_OnLoad has the correct initial values.
956 // This may not be the final mode; mode may change later in onload phase.
957 PropertyList_unique_add(&_system_properties, "java.vm.info",
958 (char*)Abstract_VM_Version::vm_info_string(), false);
959
960 UseInterpreter = true;
961 UseCompiler = true;
962 UseLoopCounter = true;
963
964 // Default values may be platform/compiler dependent -
965 // use the saved values
966 ClipInlining = Arguments::_ClipInlining;
967 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
968 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
969 BackgroundCompilation = Arguments::_BackgroundCompilation;
970
971 // Change from defaults based on mode
972 switch (mode) {
973 default:
974 ShouldNotReachHere();
975 break;
976 case _int:
977 UseCompiler = false;
978 UseLoopCounter = false;
979 AlwaysCompileLoopMethods = false;
980 UseOnStackReplacement = false;
981 break;
982 case _mixed:
983 // same as default
984 break;
985 case _comp:
986 UseInterpreter = false;
987 BackgroundCompilation = false;
988 ClipInlining = false;
989 break;
990 }
991 }
992
993 // Conflict: required to use shared spaces (-Xshare:on), but
994 // incompatible command line options were chosen.
995
996 static void no_shared_spaces() {
997 if (RequireSharedSpaces) {
998 jio_fprintf(defaultStream::error_stream(),
999 "Class data sharing is inconsistent with other specified options.\n");
1000 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1001 } else {
1002 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1003 }
1004 }
1005
1006 void Arguments::check_compressed_oops_compat() {
1007 #ifdef _LP64
1008 assert(UseCompressedOops, "Precondition");
1009 // Is it on by default or set on ergonomically
1010 bool is_on_by_default = FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops);
1011
1012 // If dumping an archive or forcing its use, disable compressed oops if possible
1013 if (DumpSharedSpaces || RequireSharedSpaces) {
1014 if (is_on_by_default) {
1015 FLAG_SET_DEFAULT(UseCompressedOops, false);
1016 return;
1017 } else {
1018 vm_exit_during_initialization(
1019 "Class Data Sharing is not supported with compressed oops yet", NULL);
1020 }
1021 } else if (UseSharedSpaces) {
1022 // UseSharedSpaces is on by default. With compressed oops, we turn it off.
1023 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1024 }
1025 #endif
1026 }
1027
1028 void Arguments::set_tiered_flags() {
1029 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1030 FLAG_SET_DEFAULT(CompilationPolicyChoice, 2);
1031 }
1032 if (CompilationPolicyChoice < 2) {
1033 vm_exit_during_initialization(
1034 "Incompatible compilation policy selected", NULL);
1035 }
1036 // Increase the code cache size - tiered compiles a lot more.
1037 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1038 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1039 }
1040 }
1041
1042 #ifndef KERNEL
1043 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1044 // if it's not explictly set or unset. If the user has chosen
1045 // UseParNewGC and not explicitly set ParallelGCThreads we
1046 // set it, unless this is a single cpu machine.
1047 void Arguments::set_parnew_gc_flags() {
1048 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1049 "control point invariant");
1050 assert(UseParNewGC, "Error");
1051
1052 // Turn off AdaptiveSizePolicy by default for parnew until it is
1053 // complete.
1054 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1055 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1056 }
1057
1058 if (ParallelGCThreads == 0) {
1059 FLAG_SET_DEFAULT(ParallelGCThreads,
1060 Abstract_VM_Version::parallel_worker_threads());
1061 if (ParallelGCThreads == 1) {
1062 FLAG_SET_DEFAULT(UseParNewGC, false);
1063 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1064 }
1065 }
1066 if (UseParNewGC) {
1067 // CDS doesn't work with ParNew yet
1068 no_shared_spaces();
1069
1070 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1071 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1072 // we set them to 1024 and 1024.
1073 // See CR 6362902.
1074 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1075 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1076 }
1077 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1078 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1079 }
1080
1081 // AlwaysTenure flag should make ParNew promote all at first collection.
1082 // See CR 6362902.
1083 if (AlwaysTenure) {
1084 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
1085 }
1086 // When using compressed oops, we use local overflow stacks,
1087 // rather than using a global overflow list chained through
1088 // the klass word of the object's pre-image.
1089 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1090 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1091 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1092 }
1093 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1094 }
1095 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1096 }
1097 }
1098
1099 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1100 // sparc/solaris for certain applications, but would gain from
1101 // further optimization and tuning efforts, and would almost
1102 // certainly gain from analysis of platform and environment.
1103 void Arguments::set_cms_and_parnew_gc_flags() {
1104 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1105 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1106
1107 // If we are using CMS, we prefer to UseParNewGC,
1108 // unless explicitly forbidden.
1109 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1110 FLAG_SET_ERGO(bool, UseParNewGC, true);
1111 }
1112
1113 // Turn off AdaptiveSizePolicy by default for cms until it is
1114 // complete.
1115 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) {
1116 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1117 }
1118
1119 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1120 // as needed.
1121 if (UseParNewGC) {
1122 set_parnew_gc_flags();
1123 }
1124
1125 // Now make adjustments for CMS
1126 size_t young_gen_per_worker;
1127 intx new_ratio;
1128 size_t min_new_default;
1129 intx tenuring_default;
1130 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0
1131 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) {
1132 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M);
1133 }
1134 young_gen_per_worker = 4*M;
1135 new_ratio = (intx)15;
1136 min_new_default = 4*M;
1137 tenuring_default = (intx)0;
1138 } else { // new defaults: "new" as of 6.0
1139 young_gen_per_worker = CMSYoungGenPerWorker;
1140 new_ratio = (intx)7;
1141 min_new_default = 16*M;
1142 tenuring_default = (intx)4;
1143 }
1144
1145 // Preferred young gen size for "short" pauses
1146 const uintx parallel_gc_threads =
1147 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1148 const size_t preferred_max_new_size_unaligned =
1149 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads);
1150 const size_t preferred_max_new_size =
1151 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1152
1153 // Unless explicitly requested otherwise, size young gen
1154 // for "short" pauses ~ 4M*ParallelGCThreads
1155
1156 // If either MaxNewSize or NewRatio is set on the command line,
1157 // assume the user is trying to set the size of the young gen.
1158
1159 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1160
1161 // Set MaxNewSize to our calculated preferred_max_new_size unless
1162 // NewSize was set on the command line and it is larger than
1163 // preferred_max_new_size.
1164 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1165 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1166 } else {
1167 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1168 }
1169 if (PrintGCDetails && Verbose) {
1170 // Too early to use gclog_or_tty
1171 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1172 }
1173
1174 // Unless explicitly requested otherwise, prefer a large
1175 // Old to Young gen size so as to shift the collection load
1176 // to the old generation concurrent collector
1177
1178 // If this is only guarded by FLAG_IS_DEFAULT(NewRatio)
1179 // then NewSize and OldSize may be calculated. That would
1180 // generally lead to some differences with ParNewGC for which
1181 // there was no obvious reason. Also limit to the case where
1182 // MaxNewSize has not been set.
1183
1184 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio));
1185
1186 // Code along this path potentially sets NewSize and OldSize
1187
1188 // Calculate the desired minimum size of the young gen but if
1189 // NewSize has been set on the command line, use it here since
1190 // it should be the final value.
1191 size_t min_new;
1192 if (FLAG_IS_DEFAULT(NewSize)) {
1193 min_new = align_size_up(ScaleForWordSize(min_new_default),
1194 os::vm_page_size());
1195 } else {
1196 min_new = NewSize;
1197 }
1198 size_t prev_initial_size = InitialHeapSize;
1199 if (prev_initial_size != 0 && prev_initial_size < min_new + OldSize) {
1200 FLAG_SET_ERGO(uintx, InitialHeapSize, min_new + OldSize);
1201 // Currently minimum size and the initial heap sizes are the same.
1202 set_min_heap_size(InitialHeapSize);
1203 if (PrintGCDetails && Verbose) {
1204 warning("Initial heap size increased to " SIZE_FORMAT " M from "
1205 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.",
1206 InitialHeapSize/M, prev_initial_size/M);
1207 }
1208 }
1209
1210 // MaxHeapSize is aligned down in collectorPolicy
1211 size_t max_heap =
1212 align_size_down(MaxHeapSize,
1213 CardTableRS::ct_max_alignment_constraint());
1214
1215 if (PrintGCDetails && Verbose) {
1216 // Too early to use gclog_or_tty
1217 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1218 " initial_heap_size: " SIZE_FORMAT
1219 " max_heap: " SIZE_FORMAT,
1220 min_heap_size(), InitialHeapSize, max_heap);
1221 }
1222 if (max_heap > min_new) {
1223 // Unless explicitly requested otherwise, make young gen
1224 // at least min_new, and at most preferred_max_new_size.
1225 if (FLAG_IS_DEFAULT(NewSize)) {
1226 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1227 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1228 if (PrintGCDetails && Verbose) {
1229 // Too early to use gclog_or_tty
1230 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize);
1231 }
1232 }
1233 // Unless explicitly requested otherwise, size old gen
1234 // so that it's at least 3X of NewSize to begin with;
1235 // later NewRatio will decide how it grows; see above.
1236 if (FLAG_IS_DEFAULT(OldSize)) {
1237 if (max_heap > NewSize) {
1238 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize));
1239 if (PrintGCDetails && Verbose) {
1240 // Too early to use gclog_or_tty
1241 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize);
1242 }
1243 }
1244 }
1245 }
1246 }
1247 // Unless explicitly requested otherwise, definitely
1248 // promote all objects surviving "tenuring_default" scavenges.
1249 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1250 FLAG_IS_DEFAULT(SurvivorRatio)) {
1251 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1252 }
1253 // If we decided above (or user explicitly requested)
1254 // `promote all' (via MaxTenuringThreshold := 0),
1255 // prefer minuscule survivor spaces so as not to waste
1256 // space for (non-existent) survivors
1257 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1258 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1259 }
1260 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1261 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1262 // This is done in order to make ParNew+CMS configuration to work
1263 // with YoungPLABSize and OldPLABSize options.
1264 // See CR 6362902.
1265 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1266 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1267 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1268 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1269 // the value (either from the command line or ergonomics) of
1270 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1271 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1272 } else {
1273 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1274 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1275 // we'll let it to take precedence.
1276 jio_fprintf(defaultStream::error_stream(),
1277 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1278 " options are specified for the CMS collector."
1279 " CMSParPromoteBlocksToClaim will take precedence.\n");
1280 }
1281 }
1282 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1283 // OldPLAB sizing manually turned off: Use a larger default setting,
1284 // unless it was manually specified. This is because a too-low value
1285 // will slow down scavenges.
1286 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1287 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1288 }
1289 }
1290 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1291 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1292 // If either of the static initialization defaults have changed, note this
1293 // modification.
1294 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1295 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1296 }
1297 if (PrintGCDetails && Verbose) {
1298 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1299 MarkStackSize / K, MarkStackSizeMax / K);
1300 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1301 }
1302 }
1303 #endif // KERNEL
1304
1305 void set_object_alignment() {
1306 // Object alignment.
1307 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1308 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1309 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1310 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1311 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1312 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1313
1314 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1315 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1316
1317 // Oop encoding heap max
1318 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1319
1320 #ifndef KERNEL
1321 // Set CMS global values
1322 CompactibleFreeListSpace::set_cms_values();
1323 #endif // KERNEL
1324 }
1325
1326 bool verify_object_alignment() {
1327 // Object alignment.
1328 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1329 jio_fprintf(defaultStream::error_stream(),
1330 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1331 (int)ObjectAlignmentInBytes);
1332 return false;
1333 }
1334 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1335 jio_fprintf(defaultStream::error_stream(),
1336 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1337 (int)ObjectAlignmentInBytes, BytesPerLong);
1338 return false;
1339 }
1340 // It does not make sense to have big object alignment
1341 // since a space lost due to alignment will be greater
1342 // then a saved space from compressed oops.
1343 if ((int)ObjectAlignmentInBytes > 256) {
1344 jio_fprintf(defaultStream::error_stream(),
1345 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1346 (int)ObjectAlignmentInBytes);
1347 return false;
1348 }
1349 // In case page size is very small.
1350 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1351 jio_fprintf(defaultStream::error_stream(),
1352 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1353 (int)ObjectAlignmentInBytes, os::vm_page_size());
1354 return false;
1355 }
1356 return true;
1357 }
1358
1359 inline uintx max_heap_for_compressed_oops() {
1360 // Avoid sign flip.
1361 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) {
1362 return 0;
1363 }
1364 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1365 NOT_LP64(ShouldNotReachHere(); return 0);
1366 }
1367
1368 bool Arguments::should_auto_select_low_pause_collector() {
1369 if (UseAutoGCSelectPolicy &&
1370 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1371 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1372 if (PrintGCDetails) {
1373 // Cannot use gclog_or_tty yet.
1374 tty->print_cr("Automatic selection of the low pause collector"
1375 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1376 }
1377 return true;
1378 }
1379 return false;
1380 }
1381
1382 void Arguments::set_ergonomics_flags() {
1383 // Parallel GC is not compatible with sharing. If one specifies
1384 // that they want sharing explicitly, do not set ergonomics flags.
1385 if (DumpSharedSpaces || ForceSharedSpaces) {
1386 return;
1387 }
1388
1389 if (os::is_server_class_machine() && !force_client_mode ) {
1390 // If no other collector is requested explicitly,
1391 // let the VM select the collector based on
1392 // machine class and automatic selection policy.
1393 if (!UseSerialGC &&
1394 !UseConcMarkSweepGC &&
1395 !UseG1GC &&
1396 !UseParNewGC &&
1397 !DumpSharedSpaces &&
1398 FLAG_IS_DEFAULT(UseParallelGC)) {
1399 if (should_auto_select_low_pause_collector()) {
1400 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1401 } else {
1402 FLAG_SET_ERGO(bool, UseParallelGC, true);
1403 }
1404 no_shared_spaces();
1405 }
1406 }
1407
1408 #ifndef ZERO
1409 #ifdef _LP64
1410 // Check that UseCompressedOops can be set with the max heap size allocated
1411 // by ergonomics.
1412 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1413 #if !defined(COMPILER1) || defined(TIERED)
1414 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1415 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1416 }
1417 #endif
1418 #ifdef _WIN64
1419 if (UseLargePages && UseCompressedOops) {
1420 // Cannot allocate guard pages for implicit checks in indexed addressing
1421 // mode, when large pages are specified on windows.
1422 // This flag could be switched ON if narrow oop base address is set to 0,
1423 // see code in Universe::initialize_heap().
1424 Universe::set_narrow_oop_use_implicit_null_checks(false);
1425 }
1426 #endif // _WIN64
1427 } else {
1428 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1429 warning("Max heap size too large for Compressed Oops");
1430 FLAG_SET_DEFAULT(UseCompressedOops, false);
1431 }
1432 }
1433 // Also checks that certain machines are slower with compressed oops
1434 // in vm_version initialization code.
1435 #endif // _LP64
1436 #endif // !ZERO
1437 }
1438
1439 void Arguments::set_parallel_gc_flags() {
1440 assert(UseParallelGC || UseParallelOldGC, "Error");
1441 // If parallel old was requested, automatically enable parallel scavenge.
1442 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1443 FLAG_SET_DEFAULT(UseParallelGC, true);
1444 }
1445
1446 // If no heap maximum was requested explicitly, use some reasonable fraction
1447 // of the physical memory, up to a maximum of 1GB.
1448 if (UseParallelGC) {
1449 FLAG_SET_ERGO(uintx, ParallelGCThreads,
1450 Abstract_VM_Version::parallel_worker_threads());
1451
1452 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1453 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1454 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1455 // See CR 6362902 for details.
1456 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1457 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1458 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1459 }
1460 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1461 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1462 }
1463 }
1464
1465 if (UseParallelOldGC) {
1466 // Par compact uses lower default values since they are treated as
1467 // minimums. These are different defaults because of the different
1468 // interpretation and are not ergonomically set.
1469 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1470 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1471 }
1472 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1473 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1474 }
1475 }
1476 }
1477 }
1478
1479 void Arguments::set_g1_gc_flags() {
1480 assert(UseG1GC, "Error");
1481 #ifdef COMPILER1
1482 FastTLABRefill = false;
1483 #endif
1484 FLAG_SET_DEFAULT(ParallelGCThreads,
1485 Abstract_VM_Version::parallel_worker_threads());
1486 if (ParallelGCThreads == 0) {
1487 FLAG_SET_DEFAULT(ParallelGCThreads,
1488 Abstract_VM_Version::parallel_worker_threads());
1489 }
1490 no_shared_spaces();
1491
1492 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1493 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1494 }
1495 if (PrintGCDetails && Verbose) {
1496 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1497 MarkStackSize / K, MarkStackSizeMax / K);
1498 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1499 }
1500
1501 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1502 // In G1, we want the default GC overhead goal to be higher than
1503 // say in PS. So we set it here to 10%. Otherwise the heap might
1504 // be expanded more aggressively than we would like it to. In
1505 // fact, even 10% seems to not be high enough in some cases
1506 // (especially small GC stress tests that the main thing they do
1507 // is allocation). We might consider increase it further.
1508 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1509 }
1510 }
1511
1512 void Arguments::set_heap_size() {
1513 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1514 // Deprecated flag
1515 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1516 }
1517
1518 const julong phys_mem =
1519 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1520 : (julong)MaxRAM;
1521
1522 // If the maximum heap size has not been set with -Xmx,
1523 // then set it as fraction of the size of physical memory,
1524 // respecting the maximum and minimum sizes of the heap.
1525 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1526 julong reasonable_max = phys_mem / MaxRAMFraction;
1527
1528 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1529 // Small physical memory, so use a minimum fraction of it for the heap
1530 reasonable_max = phys_mem / MinRAMFraction;
1531 } else {
1532 // Not-small physical memory, so require a heap at least
1533 // as large as MaxHeapSize
1534 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1535 }
1536 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1537 // Limit the heap size to ErgoHeapSizeLimit
1538 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1539 }
1540 if (UseCompressedOops) {
1541 // Limit the heap size to the maximum possible when using compressed oops
1542 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1543 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1544 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1545 // but it should be not less than default MaxHeapSize.
1546 max_coop_heap -= HeapBaseMinAddress;
1547 }
1548 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1549 }
1550 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1551
1552 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1553 // An initial heap size was specified on the command line,
1554 // so be sure that the maximum size is consistent. Done
1555 // after call to allocatable_physical_memory because that
1556 // method might reduce the allocation size.
1557 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1558 }
1559
1560 if (PrintGCDetails && Verbose) {
1561 // Cannot use gclog_or_tty yet.
1562 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1563 }
1564 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1565 }
1566
1567 // If the initial_heap_size has not been set with InitialHeapSize
1568 // or -Xms, then set it as fraction of the size of physical memory,
1569 // respecting the maximum and minimum sizes of the heap.
1570 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1571 julong reasonable_minimum = (julong)(OldSize + NewSize);
1572
1573 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1574
1575 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1576
1577 julong reasonable_initial = phys_mem / InitialRAMFraction;
1578
1579 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1580 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1581
1582 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1583
1584 if (PrintGCDetails && Verbose) {
1585 // Cannot use gclog_or_tty yet.
1586 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1587 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1588 }
1589 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1590 set_min_heap_size((uintx)reasonable_minimum);
1591 }
1592 }
1593
1594 // This must be called after ergonomics because we want bytecode rewriting
1595 // if the server compiler is used, or if UseSharedSpaces is disabled.
1596 void Arguments::set_bytecode_flags() {
1597 // Better not attempt to store into a read-only space.
1598 if (UseSharedSpaces) {
1599 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1600 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1601 }
1602
1603 if (!RewriteBytecodes) {
1604 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1605 }
1606 }
1607
1608 // Aggressive optimization flags -XX:+AggressiveOpts
1609 void Arguments::set_aggressive_opts_flags() {
1610 #ifdef COMPILER2
1611 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1612 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1613 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1614 }
1615 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1616 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1617 }
1618
1619 // Feed the cache size setting into the JDK
1620 char buffer[1024];
1621 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1622 add_property(buffer);
1623 }
1624 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1625 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1626 }
1627 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1628 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1629 }
1630 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) {
1631 FLAG_SET_DEFAULT(OptimizeStringConcat, true);
1632 }
1633 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeFill)) {
1634 FLAG_SET_DEFAULT(OptimizeFill, true);
1635 }
1636 #endif
1637
1638 if (AggressiveOpts) {
1639 // Sample flag setting code
1640 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1641 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1642 // }
1643 }
1644 }
1645
1646 //===========================================================================================================
1647 // Parsing of java.compiler property
1648
1649 void Arguments::process_java_compiler_argument(char* arg) {
1650 // For backwards compatibility, Djava.compiler=NONE or ""
1651 // causes us to switch to -Xint mode UNLESS -Xdebug
1652 // is also specified.
1653 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1654 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1655 }
1656 }
1657
1658 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1659 _sun_java_launcher = strdup(launcher);
1660 if (strcmp("gamma", _sun_java_launcher) == 0) {
1661 _created_by_gamma_launcher = true;
1662 FLAG_SET_DEFAULT(PauseAtExit, true);
1663 }
1664 }
1665
1666 bool Arguments::created_by_java_launcher() {
1667 assert(_sun_java_launcher != NULL, "property must have value");
1668 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1669 }
1670
1671 bool Arguments::created_by_gamma_launcher() {
1672 return _created_by_gamma_launcher;
1673 }
1674
1675 //===========================================================================================================
1676 // Parsing of main arguments
1677
1678 bool Arguments::verify_interval(uintx val, uintx min,
1679 uintx max, const char* name) {
1680 // Returns true iff value is in the inclusive interval [min..max]
1681 // false, otherwise.
1682 if (val >= min && val <= max) {
1683 return true;
1684 }
1685 jio_fprintf(defaultStream::error_stream(),
1686 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1687 " and " UINTX_FORMAT "\n",
1688 name, val, min, max);
1689 return false;
1690 }
1691
1692 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1693 // Returns true if given value is greater than specified min threshold
1694 // false, otherwise.
1695 if (val >= min ) {
1696 return true;
1697 }
1698 jio_fprintf(defaultStream::error_stream(),
1699 "%s of " INTX_FORMAT " is invalid; must be greater than " INTX_FORMAT "\n",
1700 name, val, min);
1701 return false;
1702 }
1703
1704 bool Arguments::verify_percentage(uintx value, const char* name) {
1705 if (value <= 100) {
1706 return true;
1707 }
1708 jio_fprintf(defaultStream::error_stream(),
1709 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1710 name, value);
1711 return false;
1712 }
1713
1714 static void force_serial_gc() {
1715 FLAG_SET_DEFAULT(UseSerialGC, true);
1716 FLAG_SET_DEFAULT(UseParNewGC, false);
1717 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1718 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1719 FLAG_SET_DEFAULT(UseParallelGC, false);
1720 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1721 FLAG_SET_DEFAULT(UseG1GC, false);
1722 }
1723
1724 static bool verify_serial_gc_flags() {
1725 return (UseSerialGC &&
1726 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1727 UseParallelGC || UseParallelOldGC));
1728 }
1729
1730 // Check consistency of GC selection
1731 bool Arguments::check_gc_consistency() {
1732 bool status = true;
1733 // Ensure that the user has not selected conflicting sets
1734 // of collectors. [Note: this check is merely a user convenience;
1735 // collectors over-ride each other so that only a non-conflicting
1736 // set is selected; however what the user gets is not what they
1737 // may have expected from the combination they asked for. It's
1738 // better to reduce user confusion by not allowing them to
1739 // select conflicting combinations.
1740 uint i = 0;
1741 if (UseSerialGC) i++;
1742 if (UseConcMarkSweepGC || UseParNewGC) i++;
1743 if (UseParallelGC || UseParallelOldGC) i++;
1744 if (UseG1GC) i++;
1745 if (i > 1) {
1746 jio_fprintf(defaultStream::error_stream(),
1747 "Conflicting collector combinations in option list; "
1748 "please refer to the release notes for the combinations "
1749 "allowed\n");
1750 status = false;
1751 }
1752
1753 return status;
1754 }
1755
1756 // Check stack pages settings
1757 bool Arguments::check_stack_pages()
1758 {
1759 bool status = true;
1760 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1761 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1762 // greater stack shadow pages can't generate instruction to bang stack
1763 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1764 return status;
1765 }
1766
1767 // Check the consistency of vm_init_args
1768 bool Arguments::check_vm_args_consistency() {
1769 // Method for adding checks for flag consistency.
1770 // The intent is to warn the user of all possible conflicts,
1771 // before returning an error.
1772 // Note: Needs platform-dependent factoring.
1773 bool status = true;
1774
1775 #if ( (defined(COMPILER2) && defined(SPARC)))
1776 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1777 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1778 // x86. Normally, VM_Version_init must be called from init_globals in
1779 // init.cpp, which is called by the initial java thread *after* arguments
1780 // have been parsed. VM_Version_init gets called twice on sparc.
1781 extern void VM_Version_init();
1782 VM_Version_init();
1783 if (!VM_Version::has_v9()) {
1784 jio_fprintf(defaultStream::error_stream(),
1785 "V8 Machine detected, Server requires V9\n");
1786 status = false;
1787 }
1788 #endif /* COMPILER2 && SPARC */
1789
1790 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1791 // builds so the cost of stack banging can be measured.
1792 #if (defined(PRODUCT) && defined(SOLARIS))
1793 if (!UseBoundThreads && !UseStackBanging) {
1794 jio_fprintf(defaultStream::error_stream(),
1795 "-UseStackBanging conflicts with -UseBoundThreads\n");
1796
1797 status = false;
1798 }
1799 #endif
1800
1801 if (TLABRefillWasteFraction == 0) {
1802 jio_fprintf(defaultStream::error_stream(),
1803 "TLABRefillWasteFraction should be a denominator, "
1804 "not " SIZE_FORMAT "\n",
1805 TLABRefillWasteFraction);
1806 status = false;
1807 }
1808
1809 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1810 "AdaptiveSizePolicyWeight");
1811 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1812 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1813 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1814 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1815
1816 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1817 jio_fprintf(defaultStream::error_stream(),
1818 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1819 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1820 MinHeapFreeRatio, MaxHeapFreeRatio);
1821 status = false;
1822 }
1823 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1824 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1825
1826 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1827 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1828 }
1829
1830 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1831 // Settings to encourage splitting.
1832 if (!FLAG_IS_CMDLINE(NewRatio)) {
1833 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1834 }
1835 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1836 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1837 }
1838 }
1839
1840 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1841 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1842 if (GCTimeLimit == 100) {
1843 // Turn off gc-overhead-limit-exceeded checks
1844 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1845 }
1846
1847 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1848
1849 // Check whether user-specified sharing option conflicts with GC or page size.
1850 // Both sharing and large pages are enabled by default on some platforms;
1851 // large pages override sharing only if explicitly set on the command line.
1852 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
1853 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
1854 UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
1855 if (cannot_share) {
1856 // Either force sharing on by forcing the other options off, or
1857 // force sharing off.
1858 if (DumpSharedSpaces || ForceSharedSpaces) {
1859 jio_fprintf(defaultStream::error_stream(),
1860 "Using Serial GC and default page size because of %s\n",
1861 ForceSharedSpaces ? "-Xshare:on" : "-Xshare:dump");
1862 force_serial_gc();
1863 FLAG_SET_DEFAULT(UseLargePages, false);
1864 } else {
1865 if (UseSharedSpaces && Verbose) {
1866 jio_fprintf(defaultStream::error_stream(),
1867 "Turning off use of shared archive because of "
1868 "choice of garbage collector or large pages\n");
1869 }
1870 no_shared_spaces();
1871 }
1872 } else if (UseLargePages && (UseSharedSpaces || DumpSharedSpaces)) {
1873 FLAG_SET_DEFAULT(UseLargePages, false);
1874 }
1875
1876 status = status && check_gc_consistency();
1877 status = status && check_stack_pages();
1878
1879 if (_has_alloc_profile) {
1880 if (UseParallelGC || UseParallelOldGC) {
1881 jio_fprintf(defaultStream::error_stream(),
1882 "error: invalid argument combination.\n"
1883 "Allocation profiling (-Xaprof) cannot be used together with "
1884 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1885 status = false;
1886 }
1887 if (UseConcMarkSweepGC) {
1888 jio_fprintf(defaultStream::error_stream(),
1889 "error: invalid argument combination.\n"
1890 "Allocation profiling (-Xaprof) cannot be used together with "
1891 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1892 status = false;
1893 }
1894 }
1895
1896 if (CMSIncrementalMode) {
1897 if (!UseConcMarkSweepGC) {
1898 jio_fprintf(defaultStream::error_stream(),
1899 "error: invalid argument combination.\n"
1900 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1901 "selected in order\nto use CMSIncrementalMode.\n");
1902 status = false;
1903 } else {
1904 status = status && verify_percentage(CMSIncrementalDutyCycle,
1905 "CMSIncrementalDutyCycle");
1906 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1907 "CMSIncrementalDutyCycleMin");
1908 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1909 "CMSIncrementalSafetyFactor");
1910 status = status && verify_percentage(CMSIncrementalOffset,
1911 "CMSIncrementalOffset");
1912 status = status && verify_percentage(CMSExpAvgFactor,
1913 "CMSExpAvgFactor");
1914 // If it was not set on the command line, set
1915 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1916 if (CMSInitiatingOccupancyFraction < 0) {
1917 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1918 }
1919 }
1920 }
1921
1922 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1923 // insists that we hold the requisite locks so that the iteration is
1924 // MT-safe. For the verification at start-up and shut-down, we don't
1925 // yet have a good way of acquiring and releasing these locks,
1926 // which are not visible at the CollectedHeap level. We want to
1927 // be able to acquire these locks and then do the iteration rather
1928 // than just disable the lock verification. This will be fixed under
1929 // bug 4788986.
1930 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1931 if (VerifyGCStartAt == 0) {
1932 warning("Heap verification at start-up disabled "
1933 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1934 VerifyGCStartAt = 1; // Disable verification at start-up
1935 }
1936 if (VerifyBeforeExit) {
1937 warning("Heap verification at shutdown disabled "
1938 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1939 VerifyBeforeExit = false; // Disable verification at shutdown
1940 }
1941 }
1942
1943 // Note: only executed in non-PRODUCT mode
1944 if (!UseAsyncConcMarkSweepGC &&
1945 (ExplicitGCInvokesConcurrent ||
1946 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1947 jio_fprintf(defaultStream::error_stream(),
1948 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1949 " with -UseAsyncConcMarkSweepGC");
1950 status = false;
1951 }
1952
1953 #ifndef SERIALGC
1954 if (UseG1GC) {
1955 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1956 "InitiatingHeapOccupancyPercent");
1957 status = status && verify_min_value(G1RefProcDrainInterval, 1,
1958 "G1RefProcDrainInterval");
1959 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
1960 "G1ConcMarkStepDurationMillis");
1961 }
1962 #endif
1963
1964 status = status && verify_interval(RefDiscoveryPolicy,
1965 ReferenceProcessor::DiscoveryPolicyMin,
1966 ReferenceProcessor::DiscoveryPolicyMax,
1967 "RefDiscoveryPolicy");
1968
1969 // Limit the lower bound of this flag to 1 as it is used in a division
1970 // expression.
1971 status = status && verify_interval(TLABWasteTargetPercent,
1972 1, 100, "TLABWasteTargetPercent");
1973
1974 status = status && verify_object_alignment();
1975
1976 return status;
1977 }
1978
1979 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1980 const char* option_type) {
1981 if (ignore) return false;
1982
1983 const char* spacer = " ";
1984 if (option_type == NULL) {
1985 option_type = ++spacer; // Set both to the empty string.
1986 }
1987
1988 if (os::obsolete_option(option)) {
1989 jio_fprintf(defaultStream::error_stream(),
1990 "Obsolete %s%soption: %s\n", option_type, spacer,
1991 option->optionString);
1992 return false;
1993 } else {
1994 jio_fprintf(defaultStream::error_stream(),
1995 "Unrecognized %s%soption: %s\n", option_type, spacer,
1996 option->optionString);
1997 return true;
1998 }
1999 }
2000
2001 static const char* user_assertion_options[] = {
2002 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2003 };
2004
2005 static const char* system_assertion_options[] = {
2006 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2007 };
2008
2009 // Return true if any of the strings in null-terminated array 'names' matches.
2010 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2011 // the option must match exactly.
2012 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2013 bool tail_allowed) {
2014 for (/* empty */; *names != NULL; ++names) {
2015 if (match_option(option, *names, tail)) {
2016 if (**tail == '\0' || tail_allowed && **tail == ':') {
2017 return true;
2018 }
2019 }
2020 }
2021 return false;
2022 }
2023
2024 bool Arguments::parse_uintx(const char* value,
2025 uintx* uintx_arg,
2026 uintx min_size) {
2027
2028 // Check the sign first since atomull() parses only unsigned values.
2029 bool value_is_positive = !(*value == '-');
2030
2031 if (value_is_positive) {
2032 julong n;
2033 bool good_return = atomull(value, &n);
2034 if (good_return) {
2035 bool above_minimum = n >= min_size;
2036 bool value_is_too_large = n > max_uintx;
2037
2038 if (above_minimum && !value_is_too_large) {
2039 *uintx_arg = n;
2040 return true;
2041 }
2042 }
2043 }
2044 return false;
2045 }
2046
2047 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2048 julong* long_arg,
2049 julong min_size) {
2050 if (!atomull(s, long_arg)) return arg_unreadable;
2051 return check_memory_size(*long_arg, min_size);
2052 }
2053
2054 // Parse JavaVMInitArgs structure
2055
2056 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2057 // For components of the system classpath.
2058 SysClassPath scp(Arguments::get_sysclasspath());
2059 bool scp_assembly_required = false;
2060
2061 // Save default settings for some mode flags
2062 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2063 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2064 Arguments::_ClipInlining = ClipInlining;
2065 Arguments::_BackgroundCompilation = BackgroundCompilation;
2066
2067 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2068 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2069 if (result != JNI_OK) {
2070 return result;
2071 }
2072
2073 // Parse JavaVMInitArgs structure passed in
2074 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2075 if (result != JNI_OK) {
2076 return result;
2077 }
2078
2079 if (AggressiveOpts) {
2080 // Insert alt-rt.jar between user-specified bootclasspath
2081 // prefix and the default bootclasspath. os::set_boot_path()
2082 // uses meta_index_dir as the default bootclasspath directory.
2083 const char* altclasses_jar = "alt-rt.jar";
2084 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2085 strlen(altclasses_jar);
2086 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
2087 strcpy(altclasses_path, get_meta_index_dir());
2088 strcat(altclasses_path, altclasses_jar);
2089 scp.add_suffix_to_prefix(altclasses_path);
2090 scp_assembly_required = true;
2091 FREE_C_HEAP_ARRAY(char, altclasses_path);
2092 }
2093
2094 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2095 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2096 if (result != JNI_OK) {
2097 return result;
2098 }
2099
2100 // Do final processing now that all arguments have been parsed
2101 result = finalize_vm_init_args(&scp, scp_assembly_required);
2102 if (result != JNI_OK) {
2103 return result;
2104 }
2105
2106 return JNI_OK;
2107 }
2108
2109 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2110 SysClassPath* scp_p,
2111 bool* scp_assembly_required_p,
2112 FlagValueOrigin origin) {
2113 // Remaining part of option string
2114 const char* tail;
2115
2116 // iterate over arguments
2117 for (int index = 0; index < args->nOptions; index++) {
2118 bool is_absolute_path = false; // for -agentpath vs -agentlib
2119
2120 const JavaVMOption* option = args->options + index;
2121
2122 if (!match_option(option, "-Djava.class.path", &tail) &&
2123 !match_option(option, "-Dsun.java.command", &tail) &&
2124 !match_option(option, "-Dsun.java.launcher", &tail)) {
2125
2126 // add all jvm options to the jvm_args string. This string
2127 // is used later to set the java.vm.args PerfData string constant.
2128 // the -Djava.class.path and the -Dsun.java.command options are
2129 // omitted from jvm_args string as each have their own PerfData
2130 // string constant object.
2131 build_jvm_args(option->optionString);
2132 }
2133
2134 // -verbose:[class/gc/jni]
2135 if (match_option(option, "-verbose", &tail)) {
2136 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2137 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2138 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2139 } else if (!strcmp(tail, ":gc")) {
2140 FLAG_SET_CMDLINE(bool, PrintGC, true);
2141 } else if (!strcmp(tail, ":jni")) {
2142 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2143 }
2144 // -da / -ea / -disableassertions / -enableassertions
2145 // These accept an optional class/package name separated by a colon, e.g.,
2146 // -da:java.lang.Thread.
2147 } else if (match_option(option, user_assertion_options, &tail, true)) {
2148 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2149 if (*tail == '\0') {
2150 JavaAssertions::setUserClassDefault(enable);
2151 } else {
2152 assert(*tail == ':', "bogus match by match_option()");
2153 JavaAssertions::addOption(tail + 1, enable);
2154 }
2155 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2156 } else if (match_option(option, system_assertion_options, &tail, false)) {
2157 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2158 JavaAssertions::setSystemClassDefault(enable);
2159 // -bootclasspath:
2160 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2161 scp_p->reset_path(tail);
2162 *scp_assembly_required_p = true;
2163 // -bootclasspath/a:
2164 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2165 scp_p->add_suffix(tail);
2166 *scp_assembly_required_p = true;
2167 // -bootclasspath/p:
2168 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2169 scp_p->add_prefix(tail);
2170 *scp_assembly_required_p = true;
2171 // -Xrun
2172 } else if (match_option(option, "-Xrun", &tail)) {
2173 if (tail != NULL) {
2174 const char* pos = strchr(tail, ':');
2175 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2176 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2177 name[len] = '\0';
2178
2179 char *options = NULL;
2180 if(pos != NULL) {
2181 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2182 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2183 }
2184 #ifdef JVMTI_KERNEL
2185 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2186 warning("profiling and debugging agents are not supported with Kernel VM");
2187 } else
2188 #endif // JVMTI_KERNEL
2189 add_init_library(name, options);
2190 }
2191 // -agentlib and -agentpath
2192 } else if (match_option(option, "-agentlib:", &tail) ||
2193 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2194 if(tail != NULL) {
2195 const char* pos = strchr(tail, '=');
2196 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2197 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2198 name[len] = '\0';
2199
2200 char *options = NULL;
2201 if(pos != NULL) {
2202 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2203 }
2204 #ifdef JVMTI_KERNEL
2205 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2206 warning("profiling and debugging agents are not supported with Kernel VM");
2207 } else
2208 #endif // JVMTI_KERNEL
2209 add_init_agent(name, options, is_absolute_path);
2210
2211 }
2212 // -javaagent
2213 } else if (match_option(option, "-javaagent:", &tail)) {
2214 if(tail != NULL) {
2215 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2216 add_init_agent("instrument", options, false);
2217 }
2218 // -Xnoclassgc
2219 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2220 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2221 // -Xincgc: i-CMS
2222 } else if (match_option(option, "-Xincgc", &tail)) {
2223 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2224 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2225 // -Xnoincgc: no i-CMS
2226 } else if (match_option(option, "-Xnoincgc", &tail)) {
2227 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2228 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2229 // -Xconcgc
2230 } else if (match_option(option, "-Xconcgc", &tail)) {
2231 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2232 // -Xnoconcgc
2233 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2234 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2235 // -Xbatch
2236 } else if (match_option(option, "-Xbatch", &tail)) {
2237 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2238 // -Xmn for compatibility with other JVM vendors
2239 } else if (match_option(option, "-Xmn", &tail)) {
2240 julong long_initial_eden_size = 0;
2241 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2242 if (errcode != arg_in_range) {
2243 jio_fprintf(defaultStream::error_stream(),
2244 "Invalid initial eden size: %s\n", option->optionString);
2245 describe_range_error(errcode);
2246 return JNI_EINVAL;
2247 }
2248 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2249 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2250 // -Xms
2251 } else if (match_option(option, "-Xms", &tail)) {
2252 julong long_initial_heap_size = 0;
2253 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2254 if (errcode != arg_in_range) {
2255 jio_fprintf(defaultStream::error_stream(),
2256 "Invalid initial heap size: %s\n", option->optionString);
2257 describe_range_error(errcode);
2258 return JNI_EINVAL;
2259 }
2260 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2261 // Currently the minimum size and the initial heap sizes are the same.
2262 set_min_heap_size(InitialHeapSize);
2263 // -Xmx
2264 } else if (match_option(option, "-Xmx", &tail)) {
2265 julong long_max_heap_size = 0;
2266 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2267 if (errcode != arg_in_range) {
2268 jio_fprintf(defaultStream::error_stream(),
2269 "Invalid maximum heap size: %s\n", option->optionString);
2270 describe_range_error(errcode);
2271 return JNI_EINVAL;
2272 }
2273 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2274 // Xmaxf
2275 } else if (match_option(option, "-Xmaxf", &tail)) {
2276 int maxf = (int)(atof(tail) * 100);
2277 if (maxf < 0 || maxf > 100) {
2278 jio_fprintf(defaultStream::error_stream(),
2279 "Bad max heap free percentage size: %s\n",
2280 option->optionString);
2281 return JNI_EINVAL;
2282 } else {
2283 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2284 }
2285 // Xminf
2286 } else if (match_option(option, "-Xminf", &tail)) {
2287 int minf = (int)(atof(tail) * 100);
2288 if (minf < 0 || minf > 100) {
2289 jio_fprintf(defaultStream::error_stream(),
2290 "Bad min heap free percentage size: %s\n",
2291 option->optionString);
2292 return JNI_EINVAL;
2293 } else {
2294 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2295 }
2296 // -Xss
2297 } else if (match_option(option, "-Xss", &tail)) {
2298 julong long_ThreadStackSize = 0;
2299 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2300 if (errcode != arg_in_range) {
2301 jio_fprintf(defaultStream::error_stream(),
2302 "Invalid thread stack size: %s\n", option->optionString);
2303 describe_range_error(errcode);
2304 return JNI_EINVAL;
2305 }
2306 // Internally track ThreadStackSize in units of 1024 bytes.
2307 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2308 round_to((int)long_ThreadStackSize, K) / K);
2309 // -Xoss
2310 } else if (match_option(option, "-Xoss", &tail)) {
2311 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2312 // -Xmaxjitcodesize
2313 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2314 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2315 julong long_ReservedCodeCacheSize = 0;
2316 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2317 (size_t)InitialCodeCacheSize);
2318 if (errcode != arg_in_range) {
2319 jio_fprintf(defaultStream::error_stream(),
2320 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2321 option->optionString, InitialCodeCacheSize/K);
2322 describe_range_error(errcode);
2323 return JNI_EINVAL;
2324 }
2325 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2326 // -green
2327 } else if (match_option(option, "-green", &tail)) {
2328 jio_fprintf(defaultStream::error_stream(),
2329 "Green threads support not available\n");
2330 return JNI_EINVAL;
2331 // -native
2332 } else if (match_option(option, "-native", &tail)) {
2333 // HotSpot always uses native threads, ignore silently for compatibility
2334 // -Xsqnopause
2335 } else if (match_option(option, "-Xsqnopause", &tail)) {
2336 // EVM option, ignore silently for compatibility
2337 // -Xrs
2338 } else if (match_option(option, "-Xrs", &tail)) {
2339 // Classic/EVM option, new functionality
2340 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2341 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2342 // change default internal VM signals used - lower case for back compat
2343 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2344 // -Xoptimize
2345 } else if (match_option(option, "-Xoptimize", &tail)) {
2346 // EVM option, ignore silently for compatibility
2347 // -Xprof
2348 } else if (match_option(option, "-Xprof", &tail)) {
2349 #ifndef FPROF_KERNEL
2350 _has_profile = true;
2351 #else // FPROF_KERNEL
2352 // do we have to exit?
2353 warning("Kernel VM does not support flat profiling.");
2354 #endif // FPROF_KERNEL
2355 // -Xaprof
2356 } else if (match_option(option, "-Xaprof", &tail)) {
2357 _has_alloc_profile = true;
2358 // -Xconcurrentio
2359 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2360 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2361 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2362 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2363 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2364 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2365
2366 // -Xinternalversion
2367 } else if (match_option(option, "-Xinternalversion", &tail)) {
2368 jio_fprintf(defaultStream::output_stream(), "%s\n",
2369 VM_Version::internal_vm_info_string());
2370 vm_exit(0);
2371 #ifndef PRODUCT
2372 // -Xprintflags
2373 } else if (match_option(option, "-Xprintflags", &tail)) {
2374 CommandLineFlags::printFlags();
2375 vm_exit(0);
2376 #endif
2377 // -D
2378 } else if (match_option(option, "-D", &tail)) {
2379 if (!add_property(tail)) {
2380 return JNI_ENOMEM;
2381 }
2382 // Out of the box management support
2383 if (match_option(option, "-Dcom.sun.management", &tail)) {
2384 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2385 }
2386 // -Xint
2387 } else if (match_option(option, "-Xint", &tail)) {
2388 set_mode_flags(_int);
2389 // -Xmixed
2390 } else if (match_option(option, "-Xmixed", &tail)) {
2391 set_mode_flags(_mixed);
2392 // -Xcomp
2393 } else if (match_option(option, "-Xcomp", &tail)) {
2394 // for testing the compiler; turn off all flags that inhibit compilation
2395 set_mode_flags(_comp);
2396
2397 // -Xshare:dump
2398 } else if (match_option(option, "-Xshare:dump", &tail)) {
2399 #ifdef TIERED
2400 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2401 set_mode_flags(_int); // Prevent compilation, which creates objects
2402 #elif defined(COMPILER2)
2403 vm_exit_during_initialization(
2404 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2405 #elif defined(KERNEL)
2406 vm_exit_during_initialization(
2407 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2408 #else
2409 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2410 set_mode_flags(_int); // Prevent compilation, which creates objects
2411 #endif
2412 // -Xshare:on
2413 } else if (match_option(option, "-Xshare:on", &tail)) {
2414 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2415 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2416 #ifdef TIERED
2417 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true);
2418 #endif // TIERED
2419 // -Xshare:auto
2420 } else if (match_option(option, "-Xshare:auto", &tail)) {
2421 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2422 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2423 // -Xshare:off
2424 } else if (match_option(option, "-Xshare:off", &tail)) {
2425 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2426 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2427
2428 // -Xverify
2429 } else if (match_option(option, "-Xverify", &tail)) {
2430 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2431 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2432 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2433 } else if (strcmp(tail, ":remote") == 0) {
2434 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2435 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2436 } else if (strcmp(tail, ":none") == 0) {
2437 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2438 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2439 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2440 return JNI_EINVAL;
2441 }
2442 // -Xdebug
2443 } else if (match_option(option, "-Xdebug", &tail)) {
2444 // note this flag has been used, then ignore
2445 set_xdebug_mode(true);
2446 // -Xnoagent
2447 } else if (match_option(option, "-Xnoagent", &tail)) {
2448 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2449 } else if (match_option(option, "-Xboundthreads", &tail)) {
2450 // Bind user level threads to kernel threads (Solaris only)
2451 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2452 } else if (match_option(option, "-Xloggc:", &tail)) {
2453 // Redirect GC output to the file. -Xloggc:<filename>
2454 // ostream_init_log(), when called will use this filename
2455 // to initialize a fileStream.
2456 _gc_log_filename = strdup(tail);
2457 FLAG_SET_CMDLINE(bool, PrintGC, true);
2458 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2459 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2460
2461 // JNI hooks
2462 } else if (match_option(option, "-Xcheck", &tail)) {
2463 if (!strcmp(tail, ":jni")) {
2464 CheckJNICalls = true;
2465 } else if (is_bad_option(option, args->ignoreUnrecognized,
2466 "check")) {
2467 return JNI_EINVAL;
2468 }
2469 } else if (match_option(option, "vfprintf", &tail)) {
2470 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2471 } else if (match_option(option, "exit", &tail)) {
2472 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2473 } else if (match_option(option, "abort", &tail)) {
2474 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2475 // -XX:+AggressiveHeap
2476 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2477
2478 // This option inspects the machine and attempts to set various
2479 // parameters to be optimal for long-running, memory allocation
2480 // intensive jobs. It is intended for machines with large
2481 // amounts of cpu and memory.
2482
2483 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2484 // VM, but we may not be able to represent the total physical memory
2485 // available (like having 8gb of memory on a box but using a 32bit VM).
2486 // Thus, we need to make sure we're using a julong for intermediate
2487 // calculations.
2488 julong initHeapSize;
2489 julong total_memory = os::physical_memory();
2490
2491 if (total_memory < (julong)256*M) {
2492 jio_fprintf(defaultStream::error_stream(),
2493 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2494 vm_exit(1);
2495 }
2496
2497 // The heap size is half of available memory, or (at most)
2498 // all of possible memory less 160mb (leaving room for the OS
2499 // when using ISM). This is the maximum; because adaptive sizing
2500 // is turned on below, the actual space used may be smaller.
2501
2502 initHeapSize = MIN2(total_memory / (julong)2,
2503 total_memory - (julong)160*M);
2504
2505 // Make sure that if we have a lot of memory we cap the 32 bit
2506 // process space. The 64bit VM version of this function is a nop.
2507 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2508
2509 // The perm gen is separate but contiguous with the
2510 // object heap (and is reserved with it) so subtract it
2511 // from the heap size.
2512 if (initHeapSize > MaxPermSize) {
2513 initHeapSize = initHeapSize - MaxPermSize;
2514 } else {
2515 warning("AggressiveHeap and MaxPermSize values may conflict");
2516 }
2517
2518 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2519 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2520 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2521 // Currently the minimum size and the initial heap sizes are the same.
2522 set_min_heap_size(initHeapSize);
2523 }
2524 if (FLAG_IS_DEFAULT(NewSize)) {
2525 // Make the young generation 3/8ths of the total heap.
2526 FLAG_SET_CMDLINE(uintx, NewSize,
2527 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2528 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2529 }
2530
2531 FLAG_SET_DEFAULT(UseLargePages, true);
2532
2533 // Increase some data structure sizes for efficiency
2534 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2535 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2536 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2537
2538 // See the OldPLABSize comment below, but replace 'after promotion'
2539 // with 'after copying'. YoungPLABSize is the size of the survivor
2540 // space per-gc-thread buffers. The default is 4kw.
2541 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2542
2543 // OldPLABSize is the size of the buffers in the old gen that
2544 // UseParallelGC uses to promote live data that doesn't fit in the
2545 // survivor spaces. At any given time, there's one for each gc thread.
2546 // The default size is 1kw. These buffers are rarely used, since the
2547 // survivor spaces are usually big enough. For specjbb, however, there
2548 // are occasions when there's lots of live data in the young gen
2549 // and we end up promoting some of it. We don't have a definite
2550 // explanation for why bumping OldPLABSize helps, but the theory
2551 // is that a bigger PLAB results in retaining something like the
2552 // original allocation order after promotion, which improves mutator
2553 // locality. A minor effect may be that larger PLABs reduce the
2554 // number of PLAB allocation events during gc. The value of 8kw
2555 // was arrived at by experimenting with specjbb.
2556 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2557
2558 // CompilationPolicyChoice=0 causes the server compiler to adopt
2559 // a more conservative which-method-do-I-compile policy when one
2560 // of the counters maintained by the interpreter trips. The
2561 // result is reduced startup time and improved specjbb and
2562 // alacrity performance. Zero is the default, but we set it
2563 // explicitly here in case the default changes.
2564 // See runtime/compilationPolicy.*.
2565 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2566
2567 // Enable parallel GC and adaptive generation sizing
2568 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2569 FLAG_SET_DEFAULT(ParallelGCThreads,
2570 Abstract_VM_Version::parallel_worker_threads());
2571
2572 // Encourage steady state memory management
2573 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2574
2575 // This appears to improve mutator locality
2576 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2577
2578 // Get around early Solaris scheduling bug
2579 // (affinity vs other jobs on system)
2580 // but disallow DR and offlining (5008695).
2581 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2582
2583 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2584 // The last option must always win.
2585 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2586 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2587 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2588 // The last option must always win.
2589 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2590 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2591 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2592 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2593 jio_fprintf(defaultStream::error_stream(),
2594 "Please use CMSClassUnloadingEnabled in place of "
2595 "CMSPermGenSweepingEnabled in the future\n");
2596 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2597 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2598 jio_fprintf(defaultStream::error_stream(),
2599 "Please use -XX:+UseGCOverheadLimit in place of "
2600 "-XX:+UseGCTimeLimit in the future\n");
2601 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2602 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2603 jio_fprintf(defaultStream::error_stream(),
2604 "Please use -XX:-UseGCOverheadLimit in place of "
2605 "-XX:-UseGCTimeLimit in the future\n");
2606 // The TLE options are for compatibility with 1.3 and will be
2607 // removed without notice in a future release. These options
2608 // are not to be documented.
2609 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2610 // No longer used.
2611 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2612 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2613 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2614 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2615 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2616 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2617 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2618 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2619 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2620 // No longer used.
2621 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2622 julong long_tlab_size = 0;
2623 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2624 if (errcode != arg_in_range) {
2625 jio_fprintf(defaultStream::error_stream(),
2626 "Invalid TLAB size: %s\n", option->optionString);
2627 describe_range_error(errcode);
2628 return JNI_EINVAL;
2629 }
2630 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2631 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2632 // No longer used.
2633 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2634 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2635 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2636 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2637 SOLARIS_ONLY(
2638 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2639 warning("-XX:+UsePermISM is obsolete.");
2640 FLAG_SET_CMDLINE(bool, UseISM, true);
2641 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2642 FLAG_SET_CMDLINE(bool, UseISM, false);
2643 )
2644 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2645 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2646 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2647 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2648 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2649 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2650 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2651 #ifdef SOLARIS
2652 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2653 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2654 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2655 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2656 #else // ndef SOLARIS
2657 jio_fprintf(defaultStream::error_stream(),
2658 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2659 return JNI_EINVAL;
2660 #endif // ndef SOLARIS
2661 #ifdef ASSERT
2662 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2663 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2664 // disable scavenge before parallel mark-compact
2665 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2666 #endif
2667 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2668 julong cms_blocks_to_claim = (julong)atol(tail);
2669 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2670 jio_fprintf(defaultStream::error_stream(),
2671 "Please use -XX:OldPLABSize in place of "
2672 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2673 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2674 julong cms_blocks_to_claim = (julong)atol(tail);
2675 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2676 jio_fprintf(defaultStream::error_stream(),
2677 "Please use -XX:OldPLABSize in place of "
2678 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2679 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2680 julong old_plab_size = 0;
2681 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2682 if (errcode != arg_in_range) {
2683 jio_fprintf(defaultStream::error_stream(),
2684 "Invalid old PLAB size: %s\n", option->optionString);
2685 describe_range_error(errcode);
2686 return JNI_EINVAL;
2687 }
2688 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2689 jio_fprintf(defaultStream::error_stream(),
2690 "Please use -XX:OldPLABSize in place of "
2691 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2692 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2693 julong young_plab_size = 0;
2694 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2695 if (errcode != arg_in_range) {
2696 jio_fprintf(defaultStream::error_stream(),
2697 "Invalid young PLAB size: %s\n", option->optionString);
2698 describe_range_error(errcode);
2699 return JNI_EINVAL;
2700 }
2701 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2702 jio_fprintf(defaultStream::error_stream(),
2703 "Please use -XX:YoungPLABSize in place of "
2704 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2705 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2706 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2707 julong stack_size = 0;
2708 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2709 if (errcode != arg_in_range) {
2710 jio_fprintf(defaultStream::error_stream(),
2711 "Invalid mark stack size: %s\n", option->optionString);
2712 describe_range_error(errcode);
2713 return JNI_EINVAL;
2714 }
2715 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2716 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2717 julong max_stack_size = 0;
2718 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2719 if (errcode != arg_in_range) {
2720 jio_fprintf(defaultStream::error_stream(),
2721 "Invalid maximum mark stack size: %s\n",
2722 option->optionString);
2723 describe_range_error(errcode);
2724 return JNI_EINVAL;
2725 }
2726 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2727 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2728 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2729 uintx conc_threads = 0;
2730 if (!parse_uintx(tail, &conc_threads, 1)) {
2731 jio_fprintf(defaultStream::error_stream(),
2732 "Invalid concurrent threads: %s\n", option->optionString);
2733 return JNI_EINVAL;
2734 }
2735 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2736 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2737 // Skip -XX:Flags= since that case has already been handled
2738 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2739 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2740 return JNI_EINVAL;
2741 }
2742 }
2743 // Unknown option
2744 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2745 return JNI_ERR;
2746 }
2747 }
2748 // Change the default value for flags which have different default values
2749 // when working with older JDKs.
2750 if (JDK_Version::current().compare_major(6) <= 0 &&
2751 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2752 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2753 }
2754 #ifdef LINUX
2755 if (JDK_Version::current().compare_major(6) <= 0 &&
2756 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2757 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2758 }
2759 #endif // LINUX
2760 return JNI_OK;
2761 }
2762
2763 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2764 // This must be done after all -D arguments have been processed.
2765 scp_p->expand_endorsed();
2766
2767 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2768 // Assemble the bootclasspath elements into the final path.
2769 Arguments::set_sysclasspath(scp_p->combined_path());
2770 }
2771
2772 // This must be done after all arguments have been processed.
2773 // java_compiler() true means set to "NONE" or empty.
2774 if (java_compiler() && !xdebug_mode()) {
2775 // For backwards compatibility, we switch to interpreted mode if
2776 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2777 // not specified.
2778 set_mode_flags(_int);
2779 }
2780 if (CompileThreshold == 0) {
2781 set_mode_flags(_int);
2782 }
2783
2784 #ifndef COMPILER2
2785 // Don't degrade server performance for footprint
2786 if (FLAG_IS_DEFAULT(UseLargePages) &&
2787 MaxHeapSize < LargePageHeapSizeThreshold) {
2788 // No need for large granularity pages w/small heaps.
2789 // Note that large pages are enabled/disabled for both the
2790 // Java heap and the code cache.
2791 FLAG_SET_DEFAULT(UseLargePages, false);
2792 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2793 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2794 }
2795
2796 // Tiered compilation is undefined with C1.
2797 TieredCompilation = false;
2798 #else
2799 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2800 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2801 }
2802 // Temporary disable bulk zeroing reduction with G1. See CR 6627983.
2803 if (UseG1GC) {
2804 FLAG_SET_DEFAULT(ReduceBulkZeroing, false);
2805 }
2806 #endif
2807
2808 // If we are running in a headless jre, force java.awt.headless property
2809 // to be true unless the property has already been set.
2810 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2811 if (os::is_headless_jre()) {
2812 const char* headless = Arguments::get_property("java.awt.headless");
2813 if (headless == NULL) {
2814 char envbuffer[128];
2815 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2816 if (!add_property("java.awt.headless=true")) {
2817 return JNI_ENOMEM;
2818 }
2819 } else {
2820 char buffer[256];
2821 strcpy(buffer, "java.awt.headless=");
2822 strcat(buffer, envbuffer);
2823 if (!add_property(buffer)) {
2824 return JNI_ENOMEM;
2825 }
2826 }
2827 }
2828 }
2829
2830 if (!check_vm_args_consistency()) {
2831 return JNI_ERR;
2832 }
2833
2834 return JNI_OK;
2835 }
2836
2837 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2838 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2839 scp_assembly_required_p);
2840 }
2841
2842 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2843 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2844 scp_assembly_required_p);
2845 }
2846
2847 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2848 const int N_MAX_OPTIONS = 64;
2849 const int OPTION_BUFFER_SIZE = 1024;
2850 char buffer[OPTION_BUFFER_SIZE];
2851
2852 // The variable will be ignored if it exceeds the length of the buffer.
2853 // Don't check this variable if user has special privileges
2854 // (e.g. unix su command).
2855 if (os::getenv(name, buffer, sizeof(buffer)) &&
2856 !os::have_special_privileges()) {
2857 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2858 jio_fprintf(defaultStream::error_stream(),
2859 "Picked up %s: %s\n", name, buffer);
2860 char* rd = buffer; // pointer to the input string (rd)
2861 int i;
2862 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2863 while (isspace(*rd)) rd++; // skip whitespace
2864 if (*rd == 0) break; // we re done when the input string is read completely
2865
2866 // The output, option string, overwrites the input string.
2867 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2868 // input string (rd).
2869 char* wrt = rd;
2870
2871 options[i++].optionString = wrt; // Fill in option
2872 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2873 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2874 int quote = *rd; // matching quote to look for
2875 rd++; // don't copy open quote
2876 while (*rd != quote) { // include everything (even spaces) up until quote
2877 if (*rd == 0) { // string termination means unmatched string
2878 jio_fprintf(defaultStream::error_stream(),
2879 "Unmatched quote in %s\n", name);
2880 return JNI_ERR;
2881 }
2882 *wrt++ = *rd++; // copy to option string
2883 }
2884 rd++; // don't copy close quote
2885 } else {
2886 *wrt++ = *rd++; // copy to option string
2887 }
2888 }
2889 // Need to check if we're done before writing a NULL,
2890 // because the write could be to the byte that rd is pointing to.
2891 if (*rd++ == 0) {
2892 *wrt = 0;
2893 break;
2894 }
2895 *wrt = 0; // Zero terminate option
2896 }
2897 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2898 JavaVMInitArgs vm_args;
2899 vm_args.version = JNI_VERSION_1_2;
2900 vm_args.options = options;
2901 vm_args.nOptions = i;
2902 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2903
2904 if (PrintVMOptions) {
2905 const char* tail;
2906 for (int i = 0; i < vm_args.nOptions; i++) {
2907 const JavaVMOption *option = vm_args.options + i;
2908 if (match_option(option, "-XX:", &tail)) {
2909 logOption(tail);
2910 }
2911 }
2912 }
2913
2914 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2915 }
2916 return JNI_OK;
2917 }
2918
2919
2920 // Parse entry point called from JNI_CreateJavaVM
2921
2922 jint Arguments::parse(const JavaVMInitArgs* args) {
2923
2924 // Sharing support
2925 // Construct the path to the archive
2926 char jvm_path[JVM_MAXPATHLEN];
2927 os::jvm_path(jvm_path, sizeof(jvm_path));
2928 #ifdef TIERED
2929 if (strstr(jvm_path, "client") != NULL) {
2930 force_client_mode = true;
2931 }
2932 #endif // TIERED
2933 char *end = strrchr(jvm_path, *os::file_separator());
2934 if (end != NULL) *end = '\0';
2935 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2936 strlen(os::file_separator()) + 20);
2937 if (shared_archive_path == NULL) return JNI_ENOMEM;
2938 strcpy(shared_archive_path, jvm_path);
2939 strcat(shared_archive_path, os::file_separator());
2940 strcat(shared_archive_path, "classes");
2941 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2942 strcat(shared_archive_path, ".jsa");
2943 SharedArchivePath = shared_archive_path;
2944
2945 // Remaining part of option string
2946 const char* tail;
2947
2948 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2949 bool settings_file_specified = false;
2950 const char* flags_file;
2951 int index;
2952 for (index = 0; index < args->nOptions; index++) {
2953 const JavaVMOption *option = args->options + index;
2954 if (match_option(option, "-XX:Flags=", &tail)) {
2955 flags_file = tail;
2956 settings_file_specified = true;
2957 }
2958 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2959 PrintVMOptions = true;
2960 }
2961 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2962 PrintVMOptions = false;
2963 }
2964 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2965 IgnoreUnrecognizedVMOptions = true;
2966 }
2967 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2968 IgnoreUnrecognizedVMOptions = false;
2969 }
2970 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2971 CommandLineFlags::printFlags();
2972 vm_exit(0);
2973 }
2974
2975 #ifndef PRODUCT
2976 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
2977 CommandLineFlags::printFlags(true);
2978 vm_exit(0);
2979 }
2980 #endif
2981 }
2982
2983 if (IgnoreUnrecognizedVMOptions) {
2984 // uncast const to modify the flag args->ignoreUnrecognized
2985 *(jboolean*)(&args->ignoreUnrecognized) = true;
2986 }
2987
2988 // Parse specified settings file
2989 if (settings_file_specified) {
2990 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
2991 return JNI_EINVAL;
2992 }
2993 }
2994
2995 // Parse default .hotspotrc settings file
2996 if (!settings_file_specified) {
2997 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
2998 return JNI_EINVAL;
2999 }
3000 }
3001
3002 if (PrintVMOptions) {
3003 for (index = 0; index < args->nOptions; index++) {
3004 const JavaVMOption *option = args->options + index;
3005 if (match_option(option, "-XX:", &tail)) {
3006 logOption(tail);
3007 }
3008 }
3009 }
3010
3011 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3012 jint result = parse_vm_init_args(args);
3013 if (result != JNI_OK) {
3014 return result;
3015 }
3016
3017 #ifndef PRODUCT
3018 if (TraceBytecodesAt != 0) {
3019 TraceBytecodes = true;
3020 }
3021 if (CountCompiledCalls) {
3022 if (UseCounterDecay) {
3023 warning("UseCounterDecay disabled because CountCalls is set");
3024 UseCounterDecay = false;
3025 }
3026 }
3027 #endif // PRODUCT
3028
3029 if (EnableInvokeDynamic && !EnableMethodHandles) {
3030 if (!FLAG_IS_DEFAULT(EnableMethodHandles)) {
3031 warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true");
3032 }
3033 EnableMethodHandles = true;
3034 }
3035 if (EnableMethodHandles && !AnonymousClasses) {
3036 if (!FLAG_IS_DEFAULT(AnonymousClasses)) {
3037 warning("forcing AnonymousClasses true because EnableMethodHandles is true");
3038 }
3039 AnonymousClasses = true;
3040 }
3041 if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) {
3042 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3043 warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true");
3044 }
3045 ScavengeRootsInCode = 1;
3046 }
3047
3048 if (PrintGCDetails) {
3049 // Turn on -verbose:gc options as well
3050 PrintGC = true;
3051 }
3052
3053 // Set object alignment values.
3054 set_object_alignment();
3055
3056 #ifdef SERIALGC
3057 force_serial_gc();
3058 #endif // SERIALGC
3059 #ifdef KERNEL
3060 no_shared_spaces();
3061 #endif // KERNEL
3062
3063 // Set flags based on ergonomics.
3064 set_ergonomics_flags();
3065
3066 if (UseCompressedOops) {
3067 check_compressed_oops_compat();
3068 }
3069
3070 // Check the GC selections again.
3071 if (!check_gc_consistency()) {
3072 return JNI_EINVAL;
3073 }
3074
3075 if (TieredCompilation) {
3076 set_tiered_flags();
3077 } else {
3078 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3079 if (CompilationPolicyChoice >= 2) {
3080 vm_exit_during_initialization(
3081 "Incompatible compilation policy selected", NULL);
3082 }
3083 }
3084
3085 #ifndef KERNEL
3086 if (UseConcMarkSweepGC) {
3087 // Set flags for CMS and ParNew. Check UseConcMarkSweep first
3088 // to ensure that when both UseConcMarkSweepGC and UseParNewGC
3089 // are true, we don't call set_parnew_gc_flags() as well.
3090 set_cms_and_parnew_gc_flags();
3091 } else {
3092 // Set heap size based on available physical memory
3093 set_heap_size();
3094 // Set per-collector flags
3095 if (UseParallelGC || UseParallelOldGC) {
3096 set_parallel_gc_flags();
3097 } else if (UseParNewGC) {
3098 set_parnew_gc_flags();
3099 } else if (UseG1GC) {
3100 set_g1_gc_flags();
3101 }
3102 }
3103 #endif // KERNEL
3104
3105 #ifdef SERIALGC
3106 assert(verify_serial_gc_flags(), "SerialGC unset");
3107 #endif // SERIALGC
3108
3109 // Set bytecode rewriting flags
3110 set_bytecode_flags();
3111
3112 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3113 set_aggressive_opts_flags();
3114
3115 // Turn off biased locking for locking debug mode flags,
3116 // which are subtlely different from each other but neither works with
3117 // biased locking.
3118 if (!UseFastLocking || UseHeavyMonitors) {
3119 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3120 // flag set to true on command line; warn the user that they
3121 // can't enable biased locking here
3122 warning("Biased Locking is not supported with locking debug flags"
3123 "; ignoring UseBiasedLocking flag." );
3124 }
3125 UseBiasedLocking = false;
3126 }
3127
3128 #ifdef CC_INTERP
3129 // Clear flags not supported by the C++ interpreter
3130 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3131 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3132 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3133 #endif // CC_INTERP
3134
3135 #ifdef COMPILER2
3136 if (!UseBiasedLocking || EmitSync != 0) {
3137 UseOptoBiasInlining = false;
3138 }
3139 #endif
3140
3141 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3142 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3143 DebugNonSafepoints = true;
3144 }
3145
3146 #ifndef PRODUCT
3147 if (CompileTheWorld) {
3148 // Force NmethodSweeper to sweep whole CodeCache each time.
3149 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3150 NmethodSweepFraction = 1;
3151 }
3152 }
3153 #endif
3154
3155 if (PrintCommandLineFlags) {
3156 CommandLineFlags::printSetFlags();
3157 }
3158
3159 // Apply CPU specific policy for the BiasedLocking
3160 if (UseBiasedLocking) {
3161 if (!VM_Version::use_biased_locking() &&
3162 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3163 UseBiasedLocking = false;
3164 }
3165 }
3166
3167 return JNI_OK;
3168 }
3169
3170 int Arguments::PropertyList_count(SystemProperty* pl) {
3171 int count = 0;
3172 while(pl != NULL) {
3173 count++;
3174 pl = pl->next();
3175 }
3176 return count;
3177 }
3178
3179 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3180 assert(key != NULL, "just checking");
3181 SystemProperty* prop;
3182 for (prop = pl; prop != NULL; prop = prop->next()) {
3183 if (strcmp(key, prop->key()) == 0) return prop->value();
3184 }
3185 return NULL;
3186 }
3187
3188 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3189 int count = 0;
3190 const char* ret_val = NULL;
3191
3192 while(pl != NULL) {
3193 if(count >= index) {
3194 ret_val = pl->key();
3195 break;
3196 }
3197 count++;
3198 pl = pl->next();
3199 }
3200
3201 return ret_val;
3202 }
3203
3204 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3205 int count = 0;
3206 char* ret_val = NULL;
3207
3208 while(pl != NULL) {
3209 if(count >= index) {
3210 ret_val = pl->value();
3211 break;
3212 }
3213 count++;
3214 pl = pl->next();
3215 }
3216
3217 return ret_val;
3218 }
3219
3220 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3221 SystemProperty* p = *plist;
3222 if (p == NULL) {
3223 *plist = new_p;
3224 } else {
3225 while (p->next() != NULL) {
3226 p = p->next();
3227 }
3228 p->set_next(new_p);
3229 }
3230 }
3231
3232 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3233 if (plist == NULL)
3234 return;
3235
3236 SystemProperty* new_p = new SystemProperty(k, v, true);
3237 PropertyList_add(plist, new_p);
3238 }
3239
3240 // This add maintains unique property key in the list.
3241 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3242 if (plist == NULL)
3243 return;
3244
3245 // If property key exist then update with new value.
3246 SystemProperty* prop;
3247 for (prop = *plist; prop != NULL; prop = prop->next()) {
3248 if (strcmp(k, prop->key()) == 0) {
3249 if (append) {
3250 prop->append_value(v);
3251 } else {
3252 prop->set_value(v);
3253 }
3254 return;
3255 }
3256 }
3257
3258 PropertyList_add(plist, k, v);
3259 }
3260
3261 #ifdef KERNEL
3262 char *Arguments::get_kernel_properties() {
3263 // Find properties starting with kernel and append them to string
3264 // We need to find out how long they are first because the URL's that they
3265 // might point to could get long.
3266 int length = 0;
3267 SystemProperty* prop;
3268 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3269 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3270 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3271 }
3272 }
3273 // Add one for null terminator.
3274 char *props = AllocateHeap(length + 1, "get_kernel_properties");
3275 if (length != 0) {
3276 int pos = 0;
3277 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3278 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3279 jio_snprintf(&props[pos], length-pos,
3280 "-D%s=%s ", prop->key(), prop->value());
3281 pos = strlen(props);
3282 }
3283 }
3284 }
3285 // null terminate props in case of null
3286 props[length] = '\0';
3287 return props;
3288 }
3289 #endif // KERNEL
3290
3291 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3292 // Returns true if all of the source pointed by src has been copied over to
3293 // the destination buffer pointed by buf. Otherwise, returns false.
3294 // Notes:
3295 // 1. If the length (buflen) of the destination buffer excluding the
3296 // NULL terminator character is not long enough for holding the expanded
3297 // pid characters, it also returns false instead of returning the partially
3298 // expanded one.
3299 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3300 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3301 char* buf, size_t buflen) {
3302 const char* p = src;
3303 char* b = buf;
3304 const char* src_end = &src[srclen];
3305 char* buf_end = &buf[buflen - 1];
3306
3307 while (p < src_end && b < buf_end) {
3308 if (*p == '%') {
3309 switch (*(++p)) {
3310 case '%': // "%%" ==> "%"
3311 *b++ = *p++;
3312 break;
3313 case 'p': { // "%p" ==> current process id
3314 // buf_end points to the character before the last character so
3315 // that we could write '\0' to the end of the buffer.
3316 size_t buf_sz = buf_end - b + 1;
3317 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3318
3319 // if jio_snprintf fails or the buffer is not long enough to hold
3320 // the expanded pid, returns false.
3321 if (ret < 0 || ret >= (int)buf_sz) {
3322 return false;
3323 } else {
3324 b += ret;
3325 assert(*b == '\0', "fail in copy_expand_pid");
3326 if (p == src_end && b == buf_end + 1) {
3327 // reach the end of the buffer.
3328 return true;
3329 }
3330 }
3331 p++;
3332 break;
3333 }
3334 default :
3335 *b++ = '%';
3336 }
3337 } else {
3338 *b++ = *p++;
3339 }
3340 }
3341 *b = '\0';
3342 return (p == src_end); // return false if not all of the source was copied
3343 }