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