Fri, 27 Jan 2012 09:04:57 +0100
Merge
1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "compiler/compilerOracle.hpp"
28 #include "memory/allocation.inline.hpp"
29 #include "memory/cardTableRS.hpp"
30 #include "memory/referenceProcessor.hpp"
31 #include "memory/universe.inline.hpp"
32 #include "oops/oop.inline.hpp"
33 #include "prims/jvmtiExport.hpp"
34 #include "runtime/arguments.hpp"
35 #include "runtime/globals_extension.hpp"
36 #include "runtime/java.hpp"
37 #include "services/management.hpp"
38 #include "utilities/defaultStream.hpp"
39 #include "utilities/taskqueue.hpp"
40 #ifdef TARGET_OS_FAMILY_linux
41 # include "os_linux.inline.hpp"
42 #endif
43 #ifdef TARGET_OS_FAMILY_solaris
44 # include "os_solaris.inline.hpp"
45 #endif
46 #ifdef TARGET_OS_FAMILY_windows
47 # include "os_windows.inline.hpp"
48 #endif
49 #ifdef TARGET_OS_FAMILY_bsd
50 # include "os_bsd.inline.hpp"
51 #endif
52 #ifndef SERIALGC
53 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
54 #endif
56 // Note: This is a special bug reporting site for the JVM
57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
58 #define DEFAULT_JAVA_LAUNCHER "generic"
60 char** Arguments::_jvm_flags_array = NULL;
61 int Arguments::_num_jvm_flags = 0;
62 char** Arguments::_jvm_args_array = NULL;
63 int Arguments::_num_jvm_args = 0;
64 char* Arguments::_java_command = NULL;
65 SystemProperty* Arguments::_system_properties = NULL;
66 const char* Arguments::_gc_log_filename = NULL;
67 bool Arguments::_has_profile = false;
68 bool Arguments::_has_alloc_profile = false;
69 uintx Arguments::_min_heap_size = 0;
70 Arguments::Mode Arguments::_mode = _mixed;
71 bool Arguments::_java_compiler = false;
72 bool Arguments::_xdebug_mode = false;
73 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
74 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
75 int Arguments::_sun_java_launcher_pid = -1;
76 bool Arguments::_created_by_gamma_launcher = false;
78 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
79 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
80 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
81 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
82 bool Arguments::_ClipInlining = ClipInlining;
84 char* Arguments::SharedArchivePath = NULL;
86 AgentLibraryList Arguments::_libraryList;
87 AgentLibraryList Arguments::_agentList;
89 abort_hook_t Arguments::_abort_hook = NULL;
90 exit_hook_t Arguments::_exit_hook = NULL;
91 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
94 SystemProperty *Arguments::_java_ext_dirs = NULL;
95 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
96 SystemProperty *Arguments::_sun_boot_library_path = NULL;
97 SystemProperty *Arguments::_java_library_path = NULL;
98 SystemProperty *Arguments::_java_home = NULL;
99 SystemProperty *Arguments::_java_class_path = NULL;
100 SystemProperty *Arguments::_sun_boot_class_path = NULL;
102 char* Arguments::_meta_index_path = NULL;
103 char* Arguments::_meta_index_dir = NULL;
105 static bool force_client_mode = false;
107 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
109 static bool match_option(const JavaVMOption *option, const char* name,
110 const char** tail) {
111 int len = (int)strlen(name);
112 if (strncmp(option->optionString, name, len) == 0) {
113 *tail = option->optionString + len;
114 return true;
115 } else {
116 return false;
117 }
118 }
120 static void logOption(const char* opt) {
121 if (PrintVMOptions) {
122 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
123 }
124 }
126 // Process java launcher properties.
127 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
128 // See if sun.java.launcher or sun.java.launcher.pid is defined.
129 // Must do this before setting up other system properties,
130 // as some of them may depend on launcher type.
131 for (int index = 0; index < args->nOptions; index++) {
132 const JavaVMOption* option = args->options + index;
133 const char* tail;
135 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
136 process_java_launcher_argument(tail, option->extraInfo);
137 continue;
138 }
139 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
140 _sun_java_launcher_pid = atoi(tail);
141 continue;
142 }
143 }
144 }
146 // Initialize system properties key and value.
147 void Arguments::init_system_properties() {
149 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
150 "Java Virtual Machine Specification", false));
151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
155 // following are JVMTI agent writeable properties.
156 // Properties values are set to NULL and they are
157 // os specific they are initialized in os::init_system_properties_values().
158 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
159 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
160 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
161 _java_library_path = new SystemProperty("java.library.path", NULL, true);
162 _java_home = new SystemProperty("java.home", NULL, true);
163 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
165 _java_class_path = new SystemProperty("java.class.path", "", true);
167 // Add to System Property list.
168 PropertyList_add(&_system_properties, _java_ext_dirs);
169 PropertyList_add(&_system_properties, _java_endorsed_dirs);
170 PropertyList_add(&_system_properties, _sun_boot_library_path);
171 PropertyList_add(&_system_properties, _java_library_path);
172 PropertyList_add(&_system_properties, _java_home);
173 PropertyList_add(&_system_properties, _java_class_path);
174 PropertyList_add(&_system_properties, _sun_boot_class_path);
176 // Set OS specific system properties values
177 os::init_system_properties_values();
178 }
181 // Update/Initialize System properties after JDK version number is known
182 void Arguments::init_version_specific_system_properties() {
183 enum { bufsz = 16 };
184 char buffer[bufsz];
185 const char* spec_vendor = "Sun Microsystems Inc.";
186 uint32_t spec_version = 0;
188 if (JDK_Version::is_gte_jdk17x_version()) {
189 spec_vendor = "Oracle Corporation";
190 spec_version = JDK_Version::current().major_version();
191 }
192 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
194 PropertyList_add(&_system_properties,
195 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
196 PropertyList_add(&_system_properties,
197 new SystemProperty("java.vm.specification.version", buffer, false));
198 PropertyList_add(&_system_properties,
199 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
200 }
202 /**
203 * Provide a slightly more user-friendly way of eliminating -XX flags.
204 * When a flag is eliminated, it can be added to this list in order to
205 * continue accepting this flag on the command-line, while issuing a warning
206 * and ignoring the value. Once the JDK version reaches the 'accept_until'
207 * limit, we flatly refuse to admit the existence of the flag. This allows
208 * a flag to die correctly over JDK releases using HSX.
209 */
210 typedef struct {
211 const char* name;
212 JDK_Version obsoleted_in; // when the flag went away
213 JDK_Version accept_until; // which version to start denying the existence
214 } ObsoleteFlag;
216 static ObsoleteFlag obsolete_jvm_flags[] = {
217 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
218 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
230 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
231 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
232 { "DefaultInitialRAMFraction",
233 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
234 { "UseDepthFirstScavengeOrder",
235 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
236 { "HandlePromotionFailure",
237 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
238 { "MaxLiveObjectEvacuationRatio",
239 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
240 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
241 { "UseParallelOldGCCompacting",
242 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
243 { "UseParallelDensePrefixUpdate",
244 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
245 { "UseParallelOldGCDensePrefix",
246 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
247 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
248 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
249 #ifdef PRODUCT
250 { "DesiredMethodLimit",
251 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
252 #endif // PRODUCT
253 { NULL, JDK_Version(0), JDK_Version(0) }
254 };
256 // Returns true if the flag is obsolete and fits into the range specified
257 // for being ignored. In the case that the flag is ignored, the 'version'
258 // value is filled in with the version number when the flag became
259 // obsolete so that that value can be displayed to the user.
260 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
261 int i = 0;
262 assert(version != NULL, "Must provide a version buffer");
263 while (obsolete_jvm_flags[i].name != NULL) {
264 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
265 // <flag>=xxx form
266 // [-|+]<flag> form
267 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
268 ((s[0] == '+' || s[0] == '-') &&
269 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
270 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
271 *version = flag_status.obsoleted_in;
272 return true;
273 }
274 }
275 i++;
276 }
277 return false;
278 }
280 // Constructs the system class path (aka boot class path) from the following
281 // components, in order:
282 //
283 // prefix // from -Xbootclasspath/p:...
284 // endorsed // the expansion of -Djava.endorsed.dirs=...
285 // base // from os::get_system_properties() or -Xbootclasspath=
286 // suffix // from -Xbootclasspath/a:...
287 //
288 // java.endorsed.dirs is a list of directories; any jar or zip files in the
289 // directories are added to the sysclasspath just before the base.
290 //
291 // This could be AllStatic, but it isn't needed after argument processing is
292 // complete.
293 class SysClassPath: public StackObj {
294 public:
295 SysClassPath(const char* base);
296 ~SysClassPath();
298 inline void set_base(const char* base);
299 inline void add_prefix(const char* prefix);
300 inline void add_suffix_to_prefix(const char* suffix);
301 inline void add_suffix(const char* suffix);
302 inline void reset_path(const char* base);
304 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
305 // property. Must be called after all command-line arguments have been
306 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
307 // combined_path().
308 void expand_endorsed();
310 inline const char* get_base() const { return _items[_scp_base]; }
311 inline const char* get_prefix() const { return _items[_scp_prefix]; }
312 inline const char* get_suffix() const { return _items[_scp_suffix]; }
313 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
315 // Combine all the components into a single c-heap-allocated string; caller
316 // must free the string if/when no longer needed.
317 char* combined_path();
319 private:
320 // Utility routines.
321 static char* add_to_path(const char* path, const char* str, bool prepend);
322 static char* add_jars_to_path(char* path, const char* directory);
324 inline void reset_item_at(int index);
326 // Array indices for the items that make up the sysclasspath. All except the
327 // base are allocated in the C heap and freed by this class.
328 enum {
329 _scp_prefix, // from -Xbootclasspath/p:...
330 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
331 _scp_base, // the default sysclasspath
332 _scp_suffix, // from -Xbootclasspath/a:...
333 _scp_nitems // the number of items, must be last.
334 };
336 const char* _items[_scp_nitems];
337 DEBUG_ONLY(bool _expansion_done;)
338 };
340 SysClassPath::SysClassPath(const char* base) {
341 memset(_items, 0, sizeof(_items));
342 _items[_scp_base] = base;
343 DEBUG_ONLY(_expansion_done = false;)
344 }
346 SysClassPath::~SysClassPath() {
347 // Free everything except the base.
348 for (int i = 0; i < _scp_nitems; ++i) {
349 if (i != _scp_base) reset_item_at(i);
350 }
351 DEBUG_ONLY(_expansion_done = false;)
352 }
354 inline void SysClassPath::set_base(const char* base) {
355 _items[_scp_base] = base;
356 }
358 inline void SysClassPath::add_prefix(const char* prefix) {
359 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
360 }
362 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
363 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
364 }
366 inline void SysClassPath::add_suffix(const char* suffix) {
367 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
368 }
370 inline void SysClassPath::reset_item_at(int index) {
371 assert(index < _scp_nitems && index != _scp_base, "just checking");
372 if (_items[index] != NULL) {
373 FREE_C_HEAP_ARRAY(char, _items[index]);
374 _items[index] = NULL;
375 }
376 }
378 inline void SysClassPath::reset_path(const char* base) {
379 // Clear the prefix and suffix.
380 reset_item_at(_scp_prefix);
381 reset_item_at(_scp_suffix);
382 set_base(base);
383 }
385 //------------------------------------------------------------------------------
387 void SysClassPath::expand_endorsed() {
388 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
390 const char* path = Arguments::get_property("java.endorsed.dirs");
391 if (path == NULL) {
392 path = Arguments::get_endorsed_dir();
393 assert(path != NULL, "no default for java.endorsed.dirs");
394 }
396 char* expanded_path = NULL;
397 const char separator = *os::path_separator();
398 const char* const end = path + strlen(path);
399 while (path < end) {
400 const char* tmp_end = strchr(path, separator);
401 if (tmp_end == NULL) {
402 expanded_path = add_jars_to_path(expanded_path, path);
403 path = end;
404 } else {
405 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
406 memcpy(dirpath, path, tmp_end - path);
407 dirpath[tmp_end - path] = '\0';
408 expanded_path = add_jars_to_path(expanded_path, dirpath);
409 FREE_C_HEAP_ARRAY(char, dirpath);
410 path = tmp_end + 1;
411 }
412 }
413 _items[_scp_endorsed] = expanded_path;
414 DEBUG_ONLY(_expansion_done = true;)
415 }
417 // Combine the bootclasspath elements, some of which may be null, into a single
418 // c-heap-allocated string.
419 char* SysClassPath::combined_path() {
420 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
421 assert(_expansion_done, "must call expand_endorsed() first.");
423 size_t lengths[_scp_nitems];
424 size_t total_len = 0;
426 const char separator = *os::path_separator();
428 // Get the lengths.
429 int i;
430 for (i = 0; i < _scp_nitems; ++i) {
431 if (_items[i] != NULL) {
432 lengths[i] = strlen(_items[i]);
433 // Include space for the separator char (or a NULL for the last item).
434 total_len += lengths[i] + 1;
435 }
436 }
437 assert(total_len > 0, "empty sysclasspath not allowed");
439 // Copy the _items to a single string.
440 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
441 char* cp_tmp = cp;
442 for (i = 0; i < _scp_nitems; ++i) {
443 if (_items[i] != NULL) {
444 memcpy(cp_tmp, _items[i], lengths[i]);
445 cp_tmp += lengths[i];
446 *cp_tmp++ = separator;
447 }
448 }
449 *--cp_tmp = '\0'; // Replace the extra separator.
450 return cp;
451 }
453 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
454 char*
455 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
456 char *cp;
458 assert(str != NULL, "just checking");
459 if (path == NULL) {
460 size_t len = strlen(str) + 1;
461 cp = NEW_C_HEAP_ARRAY(char, len);
462 memcpy(cp, str, len); // copy the trailing null
463 } else {
464 const char separator = *os::path_separator();
465 size_t old_len = strlen(path);
466 size_t str_len = strlen(str);
467 size_t len = old_len + str_len + 2;
469 if (prepend) {
470 cp = NEW_C_HEAP_ARRAY(char, len);
471 char* cp_tmp = cp;
472 memcpy(cp_tmp, str, str_len);
473 cp_tmp += str_len;
474 *cp_tmp = separator;
475 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
476 FREE_C_HEAP_ARRAY(char, path);
477 } else {
478 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
479 char* cp_tmp = cp + old_len;
480 *cp_tmp = separator;
481 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
482 }
483 }
484 return cp;
485 }
487 // Scan the directory and append any jar or zip files found to path.
488 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
489 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
490 DIR* dir = os::opendir(directory);
491 if (dir == NULL) return path;
493 char dir_sep[2] = { '\0', '\0' };
494 size_t directory_len = strlen(directory);
495 const char fileSep = *os::file_separator();
496 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
498 /* Scan the directory for jars/zips, appending them to path. */
499 struct dirent *entry;
500 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
501 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
502 const char* name = entry->d_name;
503 const char* ext = name + strlen(name) - 4;
504 bool isJarOrZip = ext > name &&
505 (os::file_name_strcmp(ext, ".jar") == 0 ||
506 os::file_name_strcmp(ext, ".zip") == 0);
507 if (isJarOrZip) {
508 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
509 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
510 path = add_to_path(path, jarpath, false);
511 FREE_C_HEAP_ARRAY(char, jarpath);
512 }
513 }
514 FREE_C_HEAP_ARRAY(char, dbuf);
515 os::closedir(dir);
516 return path;
517 }
519 // Parses a memory size specification string.
520 static bool atomull(const char *s, julong* result) {
521 julong n = 0;
522 int args_read = sscanf(s, os::julong_format_specifier(), &n);
523 if (args_read != 1) {
524 return false;
525 }
526 while (*s != '\0' && isdigit(*s)) {
527 s++;
528 }
529 // 4705540: illegal if more characters are found after the first non-digit
530 if (strlen(s) > 1) {
531 return false;
532 }
533 switch (*s) {
534 case 'T': case 't':
535 *result = n * G * K;
536 // Check for overflow.
537 if (*result/((julong)G * K) != n) return false;
538 return true;
539 case 'G': case 'g':
540 *result = n * G;
541 if (*result/G != n) return false;
542 return true;
543 case 'M': case 'm':
544 *result = n * M;
545 if (*result/M != n) return false;
546 return true;
547 case 'K': case 'k':
548 *result = n * K;
549 if (*result/K != n) return false;
550 return true;
551 case '\0':
552 *result = n;
553 return true;
554 default:
555 return false;
556 }
557 }
559 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
560 if (size < min_size) return arg_too_small;
561 // Check that size will fit in a size_t (only relevant on 32-bit)
562 if (size > max_uintx) return arg_too_big;
563 return arg_in_range;
564 }
566 // Describe an argument out of range error
567 void Arguments::describe_range_error(ArgsRange errcode) {
568 switch(errcode) {
569 case arg_too_big:
570 jio_fprintf(defaultStream::error_stream(),
571 "The specified size exceeds the maximum "
572 "representable size.\n");
573 break;
574 case arg_too_small:
575 case arg_unreadable:
576 case arg_in_range:
577 // do nothing for now
578 break;
579 default:
580 ShouldNotReachHere();
581 }
582 }
584 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
585 return CommandLineFlags::boolAtPut(name, &value, origin);
586 }
588 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
589 double v;
590 if (sscanf(value, "%lf", &v) != 1) {
591 return false;
592 }
594 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
595 return true;
596 }
597 return false;
598 }
600 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
601 julong v;
602 intx intx_v;
603 bool is_neg = false;
604 // Check the sign first since atomull() parses only unsigned values.
605 if (*value == '-') {
606 if (!CommandLineFlags::intxAt(name, &intx_v)) {
607 return false;
608 }
609 value++;
610 is_neg = true;
611 }
612 if (!atomull(value, &v)) {
613 return false;
614 }
615 intx_v = (intx) v;
616 if (is_neg) {
617 intx_v = -intx_v;
618 }
619 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
620 return true;
621 }
622 uintx uintx_v = (uintx) v;
623 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
624 return true;
625 }
626 uint64_t uint64_t_v = (uint64_t) v;
627 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
628 return true;
629 }
630 return false;
631 }
633 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
634 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
635 // Contract: CommandLineFlags always returns a pointer that needs freeing.
636 FREE_C_HEAP_ARRAY(char, value);
637 return true;
638 }
640 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
641 const char* old_value = "";
642 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
643 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
644 size_t new_len = strlen(new_value);
645 const char* value;
646 char* free_this_too = NULL;
647 if (old_len == 0) {
648 value = new_value;
649 } else if (new_len == 0) {
650 value = old_value;
651 } else {
652 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
653 // each new setting adds another LINE to the switch:
654 sprintf(buf, "%s\n%s", old_value, new_value);
655 value = buf;
656 free_this_too = buf;
657 }
658 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
659 // CommandLineFlags always returns a pointer that needs freeing.
660 FREE_C_HEAP_ARRAY(char, value);
661 if (free_this_too != NULL) {
662 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
663 FREE_C_HEAP_ARRAY(char, free_this_too);
664 }
665 return true;
666 }
668 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
670 // range of acceptable characters spelled out for portability reasons
671 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
672 #define BUFLEN 255
673 char name[BUFLEN+1];
674 char dummy;
676 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
677 return set_bool_flag(name, false, origin);
678 }
679 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
680 return set_bool_flag(name, true, origin);
681 }
683 char punct;
684 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
685 const char* value = strchr(arg, '=') + 1;
686 Flag* flag = Flag::find_flag(name, strlen(name));
687 if (flag != NULL && flag->is_ccstr()) {
688 if (flag->ccstr_accumulates()) {
689 return append_to_string_flag(name, value, origin);
690 } else {
691 if (value[0] == '\0') {
692 value = NULL;
693 }
694 return set_string_flag(name, value, origin);
695 }
696 }
697 }
699 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
700 const char* value = strchr(arg, '=') + 1;
701 // -XX:Foo:=xxx will reset the string flag to the given value.
702 if (value[0] == '\0') {
703 value = NULL;
704 }
705 return set_string_flag(name, value, origin);
706 }
708 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
709 #define SIGNED_NUMBER_RANGE "[-0123456789]"
710 #define NUMBER_RANGE "[0123456789]"
711 char value[BUFLEN + 1];
712 char value2[BUFLEN + 1];
713 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
714 // Looks like a floating-point number -- try again with more lenient format string
715 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
716 return set_fp_numeric_flag(name, value, origin);
717 }
718 }
720 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
721 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
722 return set_numeric_flag(name, value, origin);
723 }
725 return false;
726 }
728 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
729 assert(bldarray != NULL, "illegal argument");
731 if (arg == NULL) {
732 return;
733 }
735 int index = *count;
737 // expand the array and add arg to the last element
738 (*count)++;
739 if (*bldarray == NULL) {
740 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
741 } else {
742 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
743 }
744 (*bldarray)[index] = strdup(arg);
745 }
747 void Arguments::build_jvm_args(const char* arg) {
748 add_string(&_jvm_args_array, &_num_jvm_args, arg);
749 }
751 void Arguments::build_jvm_flags(const char* arg) {
752 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
753 }
755 // utility function to return a string that concatenates all
756 // strings in a given char** array
757 const char* Arguments::build_resource_string(char** args, int count) {
758 if (args == NULL || count == 0) {
759 return NULL;
760 }
761 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
762 for (int i = 1; i < count; i++) {
763 length += strlen(args[i]) + 1; // add 1 for a space
764 }
765 char* s = NEW_RESOURCE_ARRAY(char, length);
766 strcpy(s, args[0]);
767 for (int j = 1; j < count; j++) {
768 strcat(s, " ");
769 strcat(s, args[j]);
770 }
771 return (const char*) s;
772 }
774 void Arguments::print_on(outputStream* st) {
775 st->print_cr("VM Arguments:");
776 if (num_jvm_flags() > 0) {
777 st->print("jvm_flags: "); print_jvm_flags_on(st);
778 }
779 if (num_jvm_args() > 0) {
780 st->print("jvm_args: "); print_jvm_args_on(st);
781 }
782 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
783 st->print_cr("Launcher Type: %s", _sun_java_launcher);
784 }
786 void Arguments::print_jvm_flags_on(outputStream* st) {
787 if (_num_jvm_flags > 0) {
788 for (int i=0; i < _num_jvm_flags; i++) {
789 st->print("%s ", _jvm_flags_array[i]);
790 }
791 st->print_cr("");
792 }
793 }
795 void Arguments::print_jvm_args_on(outputStream* st) {
796 if (_num_jvm_args > 0) {
797 for (int i=0; i < _num_jvm_args; i++) {
798 st->print("%s ", _jvm_args_array[i]);
799 }
800 st->print_cr("");
801 }
802 }
804 bool Arguments::process_argument(const char* arg,
805 jboolean ignore_unrecognized, FlagValueOrigin origin) {
807 JDK_Version since = JDK_Version();
809 if (parse_argument(arg, origin) || ignore_unrecognized) {
810 return true;
811 }
813 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg;
814 if (is_newly_obsolete(arg, &since)) {
815 char version[256];
816 since.to_string(version, sizeof(version));
817 warning("ignoring option %s; support was removed in %s", argname, version);
818 return true;
819 }
821 jio_fprintf(defaultStream::error_stream(),
822 "Unrecognized VM option '%s'\n", argname);
823 // allow for commandline "commenting out" options like -XX:#+Verbose
824 return arg[0] == '#';
825 }
827 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
828 FILE* stream = fopen(file_name, "rb");
829 if (stream == NULL) {
830 if (should_exist) {
831 jio_fprintf(defaultStream::error_stream(),
832 "Could not open settings file %s\n", file_name);
833 return false;
834 } else {
835 return true;
836 }
837 }
839 char token[1024];
840 int pos = 0;
842 bool in_white_space = true;
843 bool in_comment = false;
844 bool in_quote = false;
845 char quote_c = 0;
846 bool result = true;
848 int c = getc(stream);
849 while(c != EOF) {
850 if (in_white_space) {
851 if (in_comment) {
852 if (c == '\n') in_comment = false;
853 } else {
854 if (c == '#') in_comment = true;
855 else if (!isspace(c)) {
856 in_white_space = false;
857 token[pos++] = c;
858 }
859 }
860 } else {
861 if (c == '\n' || (!in_quote && isspace(c))) {
862 // token ends at newline, or at unquoted whitespace
863 // this allows a way to include spaces in string-valued options
864 token[pos] = '\0';
865 logOption(token);
866 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
867 build_jvm_flags(token);
868 pos = 0;
869 in_white_space = true;
870 in_quote = false;
871 } else if (!in_quote && (c == '\'' || c == '"')) {
872 in_quote = true;
873 quote_c = c;
874 } else if (in_quote && (c == quote_c)) {
875 in_quote = false;
876 } else {
877 token[pos++] = c;
878 }
879 }
880 c = getc(stream);
881 }
882 if (pos > 0) {
883 token[pos] = '\0';
884 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
885 build_jvm_flags(token);
886 }
887 fclose(stream);
888 return result;
889 }
891 //=============================================================================================================
892 // Parsing of properties (-D)
894 const char* Arguments::get_property(const char* key) {
895 return PropertyList_get_value(system_properties(), key);
896 }
898 bool Arguments::add_property(const char* prop) {
899 const char* eq = strchr(prop, '=');
900 char* key;
901 // ns must be static--its address may be stored in a SystemProperty object.
902 const static char ns[1] = {0};
903 char* value = (char *)ns;
905 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
906 key = AllocateHeap(key_len + 1, "add_property");
907 strncpy(key, prop, key_len);
908 key[key_len] = '\0';
910 if (eq != NULL) {
911 size_t value_len = strlen(prop) - key_len - 1;
912 value = AllocateHeap(value_len + 1, "add_property");
913 strncpy(value, &prop[key_len + 1], value_len + 1);
914 }
916 if (strcmp(key, "java.compiler") == 0) {
917 process_java_compiler_argument(value);
918 FreeHeap(key);
919 if (eq != NULL) {
920 FreeHeap(value);
921 }
922 return true;
923 } else if (strcmp(key, "sun.java.command") == 0) {
924 _java_command = value;
926 // Record value in Arguments, but let it get passed to Java.
927 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
928 // launcher.pid property is private and is processed
929 // in process_sun_java_launcher_properties();
930 // the sun.java.launcher property is passed on to the java application
931 FreeHeap(key);
932 if (eq != NULL) {
933 FreeHeap(value);
934 }
935 return true;
936 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
937 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
938 // its value without going through the property list or making a Java call.
939 _java_vendor_url_bug = value;
940 } else if (strcmp(key, "sun.boot.library.path") == 0) {
941 PropertyList_unique_add(&_system_properties, key, value, true);
942 return true;
943 }
944 // Create new property and add at the end of the list
945 PropertyList_unique_add(&_system_properties, key, value);
946 return true;
947 }
949 //===========================================================================================================
950 // Setting int/mixed/comp mode flags
952 void Arguments::set_mode_flags(Mode mode) {
953 // Set up default values for all flags.
954 // If you add a flag to any of the branches below,
955 // add a default value for it here.
956 set_java_compiler(false);
957 _mode = mode;
959 // Ensure Agent_OnLoad has the correct initial values.
960 // This may not be the final mode; mode may change later in onload phase.
961 PropertyList_unique_add(&_system_properties, "java.vm.info",
962 (char*)VM_Version::vm_info_string(), false);
964 UseInterpreter = true;
965 UseCompiler = true;
966 UseLoopCounter = true;
968 #ifndef ZERO
969 // Turn these off for mixed and comp. Leave them on for Zero.
970 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
971 UseFastAccessorMethods = (mode == _int);
972 }
973 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
974 UseFastEmptyMethods = (mode == _int);
975 }
976 #endif
978 // Default values may be platform/compiler dependent -
979 // use the saved values
980 ClipInlining = Arguments::_ClipInlining;
981 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
982 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
983 BackgroundCompilation = Arguments::_BackgroundCompilation;
985 // Change from defaults based on mode
986 switch (mode) {
987 default:
988 ShouldNotReachHere();
989 break;
990 case _int:
991 UseCompiler = false;
992 UseLoopCounter = false;
993 AlwaysCompileLoopMethods = false;
994 UseOnStackReplacement = false;
995 break;
996 case _mixed:
997 // same as default
998 break;
999 case _comp:
1000 UseInterpreter = false;
1001 BackgroundCompilation = false;
1002 ClipInlining = false;
1003 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1004 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1005 // compile a level 4 (C2) and then continue executing it.
1006 if (TieredCompilation) {
1007 Tier3InvokeNotifyFreqLog = 0;
1008 Tier4InvocationThreshold = 0;
1009 }
1010 break;
1011 }
1012 }
1014 // Conflict: required to use shared spaces (-Xshare:on), but
1015 // incompatible command line options were chosen.
1017 static void no_shared_spaces() {
1018 if (RequireSharedSpaces) {
1019 jio_fprintf(defaultStream::error_stream(),
1020 "Class data sharing is inconsistent with other specified options.\n");
1021 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1022 } else {
1023 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1024 }
1025 }
1027 void Arguments::set_tiered_flags() {
1028 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1029 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1030 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1031 }
1032 if (CompilationPolicyChoice < 2) {
1033 vm_exit_during_initialization(
1034 "Incompatible compilation policy selected", NULL);
1035 }
1036 // Increase the code cache size - tiered compiles a lot more.
1037 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1038 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1039 }
1040 }
1042 #ifndef KERNEL
1043 static void disable_adaptive_size_policy(const char* collector_name) {
1044 if (UseAdaptiveSizePolicy) {
1045 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1046 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1047 collector_name);
1048 }
1049 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1050 }
1051 }
1053 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1054 // if it's not explictly set or unset. If the user has chosen
1055 // UseParNewGC and not explicitly set ParallelGCThreads we
1056 // set it, unless this is a single cpu machine.
1057 void Arguments::set_parnew_gc_flags() {
1058 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1059 "control point invariant");
1060 assert(UseParNewGC, "Error");
1062 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1063 disable_adaptive_size_policy("UseParNewGC");
1065 if (ParallelGCThreads == 0) {
1066 FLAG_SET_DEFAULT(ParallelGCThreads,
1067 Abstract_VM_Version::parallel_worker_threads());
1068 if (ParallelGCThreads == 1) {
1069 FLAG_SET_DEFAULT(UseParNewGC, false);
1070 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1071 }
1072 }
1073 if (UseParNewGC) {
1074 // CDS doesn't work with ParNew yet
1075 no_shared_spaces();
1077 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1078 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1079 // we set them to 1024 and 1024.
1080 // See CR 6362902.
1081 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1082 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1083 }
1084 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1085 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1086 }
1088 // AlwaysTenure flag should make ParNew promote all at first collection.
1089 // See CR 6362902.
1090 if (AlwaysTenure) {
1091 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
1092 }
1093 // When using compressed oops, we use local overflow stacks,
1094 // rather than using a global overflow list chained through
1095 // the klass word of the object's pre-image.
1096 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1097 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1098 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1099 }
1100 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1101 }
1102 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1103 }
1104 }
1106 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1107 // sparc/solaris for certain applications, but would gain from
1108 // further optimization and tuning efforts, and would almost
1109 // certainly gain from analysis of platform and environment.
1110 void Arguments::set_cms_and_parnew_gc_flags() {
1111 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1112 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1114 // If we are using CMS, we prefer to UseParNewGC,
1115 // unless explicitly forbidden.
1116 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1117 FLAG_SET_ERGO(bool, UseParNewGC, true);
1118 }
1120 // Turn off AdaptiveSizePolicy for CMS until it is complete.
1121 disable_adaptive_size_policy("UseConcMarkSweepGC");
1123 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1124 // as needed.
1125 if (UseParNewGC) {
1126 set_parnew_gc_flags();
1127 }
1129 // MaxHeapSize is aligned down in collectorPolicy
1130 size_t max_heap = align_size_down(MaxHeapSize,
1131 CardTableRS::ct_max_alignment_constraint());
1133 // Now make adjustments for CMS
1134 intx tenuring_default = (intx)6;
1135 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1137 // Preferred young gen size for "short" pauses:
1138 // upper bound depends on # of threads and NewRatio.
1139 const uintx parallel_gc_threads =
1140 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1141 const size_t preferred_max_new_size_unaligned =
1142 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1143 size_t preferred_max_new_size =
1144 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1146 // Unless explicitly requested otherwise, size young gen
1147 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1149 // If either MaxNewSize or NewRatio is set on the command line,
1150 // assume the user is trying to set the size of the young gen.
1151 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1153 // Set MaxNewSize to our calculated preferred_max_new_size unless
1154 // NewSize was set on the command line and it is larger than
1155 // preferred_max_new_size.
1156 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1157 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1158 } else {
1159 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1160 }
1161 if (PrintGCDetails && Verbose) {
1162 // Too early to use gclog_or_tty
1163 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1164 }
1166 // Code along this path potentially sets NewSize and OldSize
1168 assert(max_heap >= InitialHeapSize, "Error");
1169 assert(max_heap >= NewSize, "Error");
1171 if (PrintGCDetails && Verbose) {
1172 // Too early to use gclog_or_tty
1173 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1174 " initial_heap_size: " SIZE_FORMAT
1175 " max_heap: " SIZE_FORMAT,
1176 min_heap_size(), InitialHeapSize, max_heap);
1177 }
1178 size_t min_new = preferred_max_new_size;
1179 if (FLAG_IS_CMDLINE(NewSize)) {
1180 min_new = NewSize;
1181 }
1182 if (max_heap > min_new && min_heap_size() > min_new) {
1183 // Unless explicitly requested otherwise, make young gen
1184 // at least min_new, and at most preferred_max_new_size.
1185 if (FLAG_IS_DEFAULT(NewSize)) {
1186 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1187 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1188 if (PrintGCDetails && Verbose) {
1189 // Too early to use gclog_or_tty
1190 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1191 }
1192 }
1193 // Unless explicitly requested otherwise, size old gen
1194 // so it's NewRatio x of NewSize.
1195 if (FLAG_IS_DEFAULT(OldSize)) {
1196 if (max_heap > NewSize) {
1197 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1198 if (PrintGCDetails && Verbose) {
1199 // Too early to use gclog_or_tty
1200 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1201 }
1202 }
1203 }
1204 }
1205 }
1206 // Unless explicitly requested otherwise, definitely
1207 // promote all objects surviving "tenuring_default" scavenges.
1208 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1209 FLAG_IS_DEFAULT(SurvivorRatio)) {
1210 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1211 }
1212 // If we decided above (or user explicitly requested)
1213 // `promote all' (via MaxTenuringThreshold := 0),
1214 // prefer minuscule survivor spaces so as not to waste
1215 // space for (non-existent) survivors
1216 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1217 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1218 }
1219 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1220 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1221 // This is done in order to make ParNew+CMS configuration to work
1222 // with YoungPLABSize and OldPLABSize options.
1223 // See CR 6362902.
1224 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1225 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1226 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1227 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1228 // the value (either from the command line or ergonomics) of
1229 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1230 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1231 } else {
1232 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1233 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1234 // we'll let it to take precedence.
1235 jio_fprintf(defaultStream::error_stream(),
1236 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1237 " options are specified for the CMS collector."
1238 " CMSParPromoteBlocksToClaim will take precedence.\n");
1239 }
1240 }
1241 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1242 // OldPLAB sizing manually turned off: Use a larger default setting,
1243 // unless it was manually specified. This is because a too-low value
1244 // will slow down scavenges.
1245 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1246 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1247 }
1248 }
1249 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1250 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1251 // If either of the static initialization defaults have changed, note this
1252 // modification.
1253 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1254 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1255 }
1256 if (PrintGCDetails && Verbose) {
1257 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1258 MarkStackSize / K, MarkStackSizeMax / K);
1259 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1260 }
1261 }
1262 #endif // KERNEL
1264 void set_object_alignment() {
1265 // Object alignment.
1266 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1267 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1268 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1269 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1270 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1271 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1273 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1274 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1276 // Oop encoding heap max
1277 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1279 #ifndef KERNEL
1280 // Set CMS global values
1281 CompactibleFreeListSpace::set_cms_values();
1282 #endif // KERNEL
1283 }
1285 bool verify_object_alignment() {
1286 // Object alignment.
1287 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1288 jio_fprintf(defaultStream::error_stream(),
1289 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1290 (int)ObjectAlignmentInBytes);
1291 return false;
1292 }
1293 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1294 jio_fprintf(defaultStream::error_stream(),
1295 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1296 (int)ObjectAlignmentInBytes, BytesPerLong);
1297 return false;
1298 }
1299 // It does not make sense to have big object alignment
1300 // since a space lost due to alignment will be greater
1301 // then a saved space from compressed oops.
1302 if ((int)ObjectAlignmentInBytes > 256) {
1303 jio_fprintf(defaultStream::error_stream(),
1304 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1305 (int)ObjectAlignmentInBytes);
1306 return false;
1307 }
1308 // In case page size is very small.
1309 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1310 jio_fprintf(defaultStream::error_stream(),
1311 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1312 (int)ObjectAlignmentInBytes, os::vm_page_size());
1313 return false;
1314 }
1315 return true;
1316 }
1318 inline uintx max_heap_for_compressed_oops() {
1319 // Avoid sign flip.
1320 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) {
1321 return 0;
1322 }
1323 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1324 NOT_LP64(ShouldNotReachHere(); return 0);
1325 }
1327 bool Arguments::should_auto_select_low_pause_collector() {
1328 if (UseAutoGCSelectPolicy &&
1329 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1330 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1331 if (PrintGCDetails) {
1332 // Cannot use gclog_or_tty yet.
1333 tty->print_cr("Automatic selection of the low pause collector"
1334 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1335 }
1336 return true;
1337 }
1338 return false;
1339 }
1341 void Arguments::set_ergonomics_flags() {
1342 // Parallel GC is not compatible with sharing. If one specifies
1343 // that they want sharing explicitly, do not set ergonomics flags.
1344 if (DumpSharedSpaces || RequireSharedSpaces) {
1345 return;
1346 }
1348 if (os::is_server_class_machine() && !force_client_mode ) {
1349 // If no other collector is requested explicitly,
1350 // let the VM select the collector based on
1351 // machine class and automatic selection policy.
1352 if (!UseSerialGC &&
1353 !UseConcMarkSweepGC &&
1354 !UseG1GC &&
1355 !UseParNewGC &&
1356 !DumpSharedSpaces &&
1357 FLAG_IS_DEFAULT(UseParallelGC)) {
1358 if (should_auto_select_low_pause_collector()) {
1359 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1360 } else {
1361 FLAG_SET_ERGO(bool, UseParallelGC, true);
1362 }
1363 no_shared_spaces();
1364 }
1365 }
1367 #ifndef ZERO
1368 #ifdef _LP64
1369 // Check that UseCompressedOops can be set with the max heap size allocated
1370 // by ergonomics.
1371 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1372 #if !defined(COMPILER1) || defined(TIERED)
1373 // disable UseCompressedOops by default on MacOS X until 7118647 is fixed
1374 #ifndef __APPLE__
1375 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1376 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1377 }
1378 #endif // !__APPLE__
1379 #endif
1380 #ifdef _WIN64
1381 if (UseLargePages && UseCompressedOops) {
1382 // Cannot allocate guard pages for implicit checks in indexed addressing
1383 // mode, when large pages are specified on windows.
1384 // This flag could be switched ON if narrow oop base address is set to 0,
1385 // see code in Universe::initialize_heap().
1386 Universe::set_narrow_oop_use_implicit_null_checks(false);
1387 }
1388 #endif // _WIN64
1389 } else {
1390 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1391 warning("Max heap size too large for Compressed Oops");
1392 FLAG_SET_DEFAULT(UseCompressedOops, false);
1393 }
1394 }
1395 // Also checks that certain machines are slower with compressed oops
1396 // in vm_version initialization code.
1397 #endif // _LP64
1398 #endif // !ZERO
1399 }
1401 void Arguments::set_parallel_gc_flags() {
1402 assert(UseParallelGC || UseParallelOldGC, "Error");
1403 // If parallel old was requested, automatically enable parallel scavenge.
1404 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) {
1405 FLAG_SET_DEFAULT(UseParallelGC, true);
1406 }
1408 // If no heap maximum was requested explicitly, use some reasonable fraction
1409 // of the physical memory, up to a maximum of 1GB.
1410 if (UseParallelGC) {
1411 FLAG_SET_DEFAULT(ParallelGCThreads,
1412 Abstract_VM_Version::parallel_worker_threads());
1414 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1415 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1416 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1417 // See CR 6362902 for details.
1418 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1419 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1420 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1421 }
1422 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1423 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1424 }
1425 }
1427 if (UseParallelOldGC) {
1428 // Par compact uses lower default values since they are treated as
1429 // minimums. These are different defaults because of the different
1430 // interpretation and are not ergonomically set.
1431 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1432 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1433 }
1434 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1435 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1436 }
1437 }
1438 }
1439 if (UseNUMA) {
1440 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
1441 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
1442 }
1443 // For those collectors or operating systems (eg, Windows) that do
1444 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
1445 UseNUMAInterleaving = true;
1446 }
1447 }
1449 void Arguments::set_g1_gc_flags() {
1450 assert(UseG1GC, "Error");
1451 #ifdef COMPILER1
1452 FastTLABRefill = false;
1453 #endif
1454 FLAG_SET_DEFAULT(ParallelGCThreads,
1455 Abstract_VM_Version::parallel_worker_threads());
1456 if (ParallelGCThreads == 0) {
1457 FLAG_SET_DEFAULT(ParallelGCThreads,
1458 Abstract_VM_Version::parallel_worker_threads());
1459 }
1460 no_shared_spaces();
1462 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1463 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1464 }
1465 if (PrintGCDetails && Verbose) {
1466 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1467 MarkStackSize / K, MarkStackSizeMax / K);
1468 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1469 }
1471 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1472 // In G1, we want the default GC overhead goal to be higher than
1473 // say in PS. So we set it here to 10%. Otherwise the heap might
1474 // be expanded more aggressively than we would like it to. In
1475 // fact, even 10% seems to not be high enough in some cases
1476 // (especially small GC stress tests that the main thing they do
1477 // is allocation). We might consider increase it further.
1478 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1479 }
1480 }
1482 void Arguments::set_heap_size() {
1483 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1484 // Deprecated flag
1485 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1486 }
1488 const julong phys_mem =
1489 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1490 : (julong)MaxRAM;
1492 // If the maximum heap size has not been set with -Xmx,
1493 // then set it as fraction of the size of physical memory,
1494 // respecting the maximum and minimum sizes of the heap.
1495 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1496 julong reasonable_max = phys_mem / MaxRAMFraction;
1498 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1499 // Small physical memory, so use a minimum fraction of it for the heap
1500 reasonable_max = phys_mem / MinRAMFraction;
1501 } else {
1502 // Not-small physical memory, so require a heap at least
1503 // as large as MaxHeapSize
1504 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1505 }
1506 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1507 // Limit the heap size to ErgoHeapSizeLimit
1508 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1509 }
1510 if (UseCompressedOops) {
1511 // Limit the heap size to the maximum possible when using compressed oops
1512 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1513 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1514 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1515 // but it should be not less than default MaxHeapSize.
1516 max_coop_heap -= HeapBaseMinAddress;
1517 }
1518 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1519 }
1520 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1522 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1523 // An initial heap size was specified on the command line,
1524 // so be sure that the maximum size is consistent. Done
1525 // after call to allocatable_physical_memory because that
1526 // method might reduce the allocation size.
1527 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1528 }
1530 if (PrintGCDetails && Verbose) {
1531 // Cannot use gclog_or_tty yet.
1532 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1533 }
1534 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1535 }
1537 // If the initial_heap_size has not been set with InitialHeapSize
1538 // or -Xms, then set it as fraction of the size of physical memory,
1539 // respecting the maximum and minimum sizes of the heap.
1540 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1541 julong reasonable_minimum = (julong)(OldSize + NewSize);
1543 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1545 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1547 julong reasonable_initial = phys_mem / InitialRAMFraction;
1549 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1550 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1552 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1554 if (PrintGCDetails && Verbose) {
1555 // Cannot use gclog_or_tty yet.
1556 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1557 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1558 }
1559 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1560 set_min_heap_size((uintx)reasonable_minimum);
1561 }
1562 }
1564 // This must be called after ergonomics because we want bytecode rewriting
1565 // if the server compiler is used, or if UseSharedSpaces is disabled.
1566 void Arguments::set_bytecode_flags() {
1567 // Better not attempt to store into a read-only space.
1568 if (UseSharedSpaces) {
1569 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1570 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1571 }
1573 if (!RewriteBytecodes) {
1574 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1575 }
1576 }
1578 // Aggressive optimization flags -XX:+AggressiveOpts
1579 void Arguments::set_aggressive_opts_flags() {
1580 #ifdef COMPILER2
1581 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1582 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1583 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1584 }
1585 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1586 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1587 }
1589 // Feed the cache size setting into the JDK
1590 char buffer[1024];
1591 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1592 add_property(buffer);
1593 }
1594 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1595 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1596 }
1597 #endif
1599 if (AggressiveOpts) {
1600 // Sample flag setting code
1601 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1602 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1603 // }
1604 }
1605 }
1607 //===========================================================================================================
1608 // Parsing of java.compiler property
1610 void Arguments::process_java_compiler_argument(char* arg) {
1611 // For backwards compatibility, Djava.compiler=NONE or ""
1612 // causes us to switch to -Xint mode UNLESS -Xdebug
1613 // is also specified.
1614 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1615 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1616 }
1617 }
1619 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1620 _sun_java_launcher = strdup(launcher);
1621 if (strcmp("gamma", _sun_java_launcher) == 0) {
1622 _created_by_gamma_launcher = true;
1623 }
1624 }
1626 bool Arguments::created_by_java_launcher() {
1627 assert(_sun_java_launcher != NULL, "property must have value");
1628 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1629 }
1631 bool Arguments::created_by_gamma_launcher() {
1632 return _created_by_gamma_launcher;
1633 }
1635 //===========================================================================================================
1636 // Parsing of main arguments
1638 bool Arguments::verify_interval(uintx val, uintx min,
1639 uintx max, const char* name) {
1640 // Returns true iff value is in the inclusive interval [min..max]
1641 // false, otherwise.
1642 if (val >= min && val <= max) {
1643 return true;
1644 }
1645 jio_fprintf(defaultStream::error_stream(),
1646 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1647 " and " UINTX_FORMAT "\n",
1648 name, val, min, max);
1649 return false;
1650 }
1652 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1653 // Returns true if given value is at least specified min threshold
1654 // false, otherwise.
1655 if (val >= min ) {
1656 return true;
1657 }
1658 jio_fprintf(defaultStream::error_stream(),
1659 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1660 name, val, min);
1661 return false;
1662 }
1664 bool Arguments::verify_percentage(uintx value, const char* name) {
1665 if (value <= 100) {
1666 return true;
1667 }
1668 jio_fprintf(defaultStream::error_stream(),
1669 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1670 name, value);
1671 return false;
1672 }
1674 static void force_serial_gc() {
1675 FLAG_SET_DEFAULT(UseSerialGC, true);
1676 FLAG_SET_DEFAULT(UseParNewGC, false);
1677 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1678 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1679 FLAG_SET_DEFAULT(UseParallelGC, false);
1680 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1681 FLAG_SET_DEFAULT(UseG1GC, false);
1682 }
1684 static bool verify_serial_gc_flags() {
1685 return (UseSerialGC &&
1686 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1687 UseParallelGC || UseParallelOldGC));
1688 }
1690 // check if do gclog rotation
1691 // +UseGCLogFileRotation is a must,
1692 // no gc log rotation when log file not supplied or
1693 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1694 void check_gclog_consistency() {
1695 if (UseGCLogFileRotation) {
1696 if ((Arguments::gc_log_filename() == NULL) ||
1697 (NumberOfGCLogFiles == 0) ||
1698 (GCLogFileSize == 0)) {
1699 jio_fprintf(defaultStream::output_stream(),
1700 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1701 "where num_of_file > 0 and num_of_size > 0\n"
1702 "GC log rotation is turned off\n");
1703 UseGCLogFileRotation = false;
1704 }
1705 }
1707 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1708 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1709 jio_fprintf(defaultStream::output_stream(),
1710 "GCLogFileSize changed to minimum 8K\n");
1711 }
1712 }
1714 // Check consistency of GC selection
1715 bool Arguments::check_gc_consistency() {
1716 check_gclog_consistency();
1717 bool status = true;
1718 // Ensure that the user has not selected conflicting sets
1719 // of collectors. [Note: this check is merely a user convenience;
1720 // collectors over-ride each other so that only a non-conflicting
1721 // set is selected; however what the user gets is not what they
1722 // may have expected from the combination they asked for. It's
1723 // better to reduce user confusion by not allowing them to
1724 // select conflicting combinations.
1725 uint i = 0;
1726 if (UseSerialGC) i++;
1727 if (UseConcMarkSweepGC || UseParNewGC) i++;
1728 if (UseParallelGC || UseParallelOldGC) i++;
1729 if (UseG1GC) i++;
1730 if (i > 1) {
1731 jio_fprintf(defaultStream::error_stream(),
1732 "Conflicting collector combinations in option list; "
1733 "please refer to the release notes for the combinations "
1734 "allowed\n");
1735 status = false;
1736 }
1738 return status;
1739 }
1741 // Check stack pages settings
1742 bool Arguments::check_stack_pages()
1743 {
1744 bool status = true;
1745 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1746 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1747 // greater stack shadow pages can't generate instruction to bang stack
1748 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1749 return status;
1750 }
1752 // Check the consistency of vm_init_args
1753 bool Arguments::check_vm_args_consistency() {
1754 // Method for adding checks for flag consistency.
1755 // The intent is to warn the user of all possible conflicts,
1756 // before returning an error.
1757 // Note: Needs platform-dependent factoring.
1758 bool status = true;
1760 #if ( (defined(COMPILER2) && defined(SPARC)))
1761 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1762 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1763 // x86. Normally, VM_Version_init must be called from init_globals in
1764 // init.cpp, which is called by the initial java thread *after* arguments
1765 // have been parsed. VM_Version_init gets called twice on sparc.
1766 extern void VM_Version_init();
1767 VM_Version_init();
1768 if (!VM_Version::has_v9()) {
1769 jio_fprintf(defaultStream::error_stream(),
1770 "V8 Machine detected, Server requires V9\n");
1771 status = false;
1772 }
1773 #endif /* COMPILER2 && SPARC */
1775 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1776 // builds so the cost of stack banging can be measured.
1777 #if (defined(PRODUCT) && defined(SOLARIS))
1778 if (!UseBoundThreads && !UseStackBanging) {
1779 jio_fprintf(defaultStream::error_stream(),
1780 "-UseStackBanging conflicts with -UseBoundThreads\n");
1782 status = false;
1783 }
1784 #endif
1786 if (TLABRefillWasteFraction == 0) {
1787 jio_fprintf(defaultStream::error_stream(),
1788 "TLABRefillWasteFraction should be a denominator, "
1789 "not " SIZE_FORMAT "\n",
1790 TLABRefillWasteFraction);
1791 status = false;
1792 }
1794 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1795 "AdaptiveSizePolicyWeight");
1796 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1797 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1798 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1799 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1801 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1802 jio_fprintf(defaultStream::error_stream(),
1803 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1804 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1805 MinHeapFreeRatio, MaxHeapFreeRatio);
1806 status = false;
1807 }
1808 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1809 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1811 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1812 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1813 }
1815 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1816 // Settings to encourage splitting.
1817 if (!FLAG_IS_CMDLINE(NewRatio)) {
1818 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1819 }
1820 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1821 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1822 }
1823 }
1825 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1826 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1827 if (GCTimeLimit == 100) {
1828 // Turn off gc-overhead-limit-exceeded checks
1829 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1830 }
1832 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1834 status = status && check_gc_consistency();
1835 status = status && check_stack_pages();
1837 if (_has_alloc_profile) {
1838 if (UseParallelGC || UseParallelOldGC) {
1839 jio_fprintf(defaultStream::error_stream(),
1840 "error: invalid argument combination.\n"
1841 "Allocation profiling (-Xaprof) cannot be used together with "
1842 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1843 status = false;
1844 }
1845 if (UseConcMarkSweepGC) {
1846 jio_fprintf(defaultStream::error_stream(),
1847 "error: invalid argument combination.\n"
1848 "Allocation profiling (-Xaprof) cannot be used together with "
1849 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1850 status = false;
1851 }
1852 }
1854 if (CMSIncrementalMode) {
1855 if (!UseConcMarkSweepGC) {
1856 jio_fprintf(defaultStream::error_stream(),
1857 "error: invalid argument combination.\n"
1858 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1859 "selected in order\nto use CMSIncrementalMode.\n");
1860 status = false;
1861 } else {
1862 status = status && verify_percentage(CMSIncrementalDutyCycle,
1863 "CMSIncrementalDutyCycle");
1864 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1865 "CMSIncrementalDutyCycleMin");
1866 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1867 "CMSIncrementalSafetyFactor");
1868 status = status && verify_percentage(CMSIncrementalOffset,
1869 "CMSIncrementalOffset");
1870 status = status && verify_percentage(CMSExpAvgFactor,
1871 "CMSExpAvgFactor");
1872 // If it was not set on the command line, set
1873 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1874 if (CMSInitiatingOccupancyFraction < 0) {
1875 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1876 }
1877 }
1878 }
1880 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1881 // insists that we hold the requisite locks so that the iteration is
1882 // MT-safe. For the verification at start-up and shut-down, we don't
1883 // yet have a good way of acquiring and releasing these locks,
1884 // which are not visible at the CollectedHeap level. We want to
1885 // be able to acquire these locks and then do the iteration rather
1886 // than just disable the lock verification. This will be fixed under
1887 // bug 4788986.
1888 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1889 if (VerifyGCStartAt == 0) {
1890 warning("Heap verification at start-up disabled "
1891 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1892 VerifyGCStartAt = 1; // Disable verification at start-up
1893 }
1894 if (VerifyBeforeExit) {
1895 warning("Heap verification at shutdown disabled "
1896 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1897 VerifyBeforeExit = false; // Disable verification at shutdown
1898 }
1899 }
1901 // Note: only executed in non-PRODUCT mode
1902 if (!UseAsyncConcMarkSweepGC &&
1903 (ExplicitGCInvokesConcurrent ||
1904 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1905 jio_fprintf(defaultStream::error_stream(),
1906 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1907 " with -UseAsyncConcMarkSweepGC");
1908 status = false;
1909 }
1911 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
1913 #ifndef SERIALGC
1914 if (UseG1GC) {
1915 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1916 "InitiatingHeapOccupancyPercent");
1917 status = status && verify_min_value(G1RefProcDrainInterval, 1,
1918 "G1RefProcDrainInterval");
1919 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
1920 "G1ConcMarkStepDurationMillis");
1921 }
1922 #endif
1924 status = status && verify_interval(RefDiscoveryPolicy,
1925 ReferenceProcessor::DiscoveryPolicyMin,
1926 ReferenceProcessor::DiscoveryPolicyMax,
1927 "RefDiscoveryPolicy");
1929 // Limit the lower bound of this flag to 1 as it is used in a division
1930 // expression.
1931 status = status && verify_interval(TLABWasteTargetPercent,
1932 1, 100, "TLABWasteTargetPercent");
1934 status = status && verify_object_alignment();
1936 return status;
1937 }
1939 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1940 const char* option_type) {
1941 if (ignore) return false;
1943 const char* spacer = " ";
1944 if (option_type == NULL) {
1945 option_type = ++spacer; // Set both to the empty string.
1946 }
1948 if (os::obsolete_option(option)) {
1949 jio_fprintf(defaultStream::error_stream(),
1950 "Obsolete %s%soption: %s\n", option_type, spacer,
1951 option->optionString);
1952 return false;
1953 } else {
1954 jio_fprintf(defaultStream::error_stream(),
1955 "Unrecognized %s%soption: %s\n", option_type, spacer,
1956 option->optionString);
1957 return true;
1958 }
1959 }
1961 static const char* user_assertion_options[] = {
1962 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1963 };
1965 static const char* system_assertion_options[] = {
1966 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1967 };
1969 // Return true if any of the strings in null-terminated array 'names' matches.
1970 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1971 // the option must match exactly.
1972 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1973 bool tail_allowed) {
1974 for (/* empty */; *names != NULL; ++names) {
1975 if (match_option(option, *names, tail)) {
1976 if (**tail == '\0' || tail_allowed && **tail == ':') {
1977 return true;
1978 }
1979 }
1980 }
1981 return false;
1982 }
1984 bool Arguments::parse_uintx(const char* value,
1985 uintx* uintx_arg,
1986 uintx min_size) {
1988 // Check the sign first since atomull() parses only unsigned values.
1989 bool value_is_positive = !(*value == '-');
1991 if (value_is_positive) {
1992 julong n;
1993 bool good_return = atomull(value, &n);
1994 if (good_return) {
1995 bool above_minimum = n >= min_size;
1996 bool value_is_too_large = n > max_uintx;
1998 if (above_minimum && !value_is_too_large) {
1999 *uintx_arg = n;
2000 return true;
2001 }
2002 }
2003 }
2004 return false;
2005 }
2007 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2008 julong* long_arg,
2009 julong min_size) {
2010 if (!atomull(s, long_arg)) return arg_unreadable;
2011 return check_memory_size(*long_arg, min_size);
2012 }
2014 // Parse JavaVMInitArgs structure
2016 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2017 // For components of the system classpath.
2018 SysClassPath scp(Arguments::get_sysclasspath());
2019 bool scp_assembly_required = false;
2021 // Save default settings for some mode flags
2022 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2023 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2024 Arguments::_ClipInlining = ClipInlining;
2025 Arguments::_BackgroundCompilation = BackgroundCompilation;
2027 // Setup flags for mixed which is the default
2028 set_mode_flags(_mixed);
2030 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2031 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2032 if (result != JNI_OK) {
2033 return result;
2034 }
2036 // Parse JavaVMInitArgs structure passed in
2037 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2038 if (result != JNI_OK) {
2039 return result;
2040 }
2042 if (AggressiveOpts) {
2043 // Insert alt-rt.jar between user-specified bootclasspath
2044 // prefix and the default bootclasspath. os::set_boot_path()
2045 // uses meta_index_dir as the default bootclasspath directory.
2046 const char* altclasses_jar = "alt-rt.jar";
2047 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2048 strlen(altclasses_jar);
2049 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
2050 strcpy(altclasses_path, get_meta_index_dir());
2051 strcat(altclasses_path, altclasses_jar);
2052 scp.add_suffix_to_prefix(altclasses_path);
2053 scp_assembly_required = true;
2054 FREE_C_HEAP_ARRAY(char, altclasses_path);
2055 }
2057 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2058 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2059 if (result != JNI_OK) {
2060 return result;
2061 }
2063 // Do final processing now that all arguments have been parsed
2064 result = finalize_vm_init_args(&scp, scp_assembly_required);
2065 if (result != JNI_OK) {
2066 return result;
2067 }
2069 return JNI_OK;
2070 }
2072 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2073 SysClassPath* scp_p,
2074 bool* scp_assembly_required_p,
2075 FlagValueOrigin origin) {
2076 // Remaining part of option string
2077 const char* tail;
2079 // iterate over arguments
2080 for (int index = 0; index < args->nOptions; index++) {
2081 bool is_absolute_path = false; // for -agentpath vs -agentlib
2083 const JavaVMOption* option = args->options + index;
2085 if (!match_option(option, "-Djava.class.path", &tail) &&
2086 !match_option(option, "-Dsun.java.command", &tail) &&
2087 !match_option(option, "-Dsun.java.launcher", &tail)) {
2089 // add all jvm options to the jvm_args string. This string
2090 // is used later to set the java.vm.args PerfData string constant.
2091 // the -Djava.class.path and the -Dsun.java.command options are
2092 // omitted from jvm_args string as each have their own PerfData
2093 // string constant object.
2094 build_jvm_args(option->optionString);
2095 }
2097 // -verbose:[class/gc/jni]
2098 if (match_option(option, "-verbose", &tail)) {
2099 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2100 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2101 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2102 } else if (!strcmp(tail, ":gc")) {
2103 FLAG_SET_CMDLINE(bool, PrintGC, true);
2104 } else if (!strcmp(tail, ":jni")) {
2105 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2106 }
2107 // -da / -ea / -disableassertions / -enableassertions
2108 // These accept an optional class/package name separated by a colon, e.g.,
2109 // -da:java.lang.Thread.
2110 } else if (match_option(option, user_assertion_options, &tail, true)) {
2111 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2112 if (*tail == '\0') {
2113 JavaAssertions::setUserClassDefault(enable);
2114 } else {
2115 assert(*tail == ':', "bogus match by match_option()");
2116 JavaAssertions::addOption(tail + 1, enable);
2117 }
2118 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2119 } else if (match_option(option, system_assertion_options, &tail, false)) {
2120 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2121 JavaAssertions::setSystemClassDefault(enable);
2122 // -bootclasspath:
2123 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2124 scp_p->reset_path(tail);
2125 *scp_assembly_required_p = true;
2126 // -bootclasspath/a:
2127 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2128 scp_p->add_suffix(tail);
2129 *scp_assembly_required_p = true;
2130 // -bootclasspath/p:
2131 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2132 scp_p->add_prefix(tail);
2133 *scp_assembly_required_p = true;
2134 // -Xrun
2135 } else if (match_option(option, "-Xrun", &tail)) {
2136 if (tail != NULL) {
2137 const char* pos = strchr(tail, ':');
2138 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2139 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2140 name[len] = '\0';
2142 char *options = NULL;
2143 if(pos != NULL) {
2144 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2145 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2146 }
2147 #ifdef JVMTI_KERNEL
2148 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2149 warning("profiling and debugging agents are not supported with Kernel VM");
2150 } else
2151 #endif // JVMTI_KERNEL
2152 add_init_library(name, options);
2153 }
2154 // -agentlib and -agentpath
2155 } else if (match_option(option, "-agentlib:", &tail) ||
2156 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2157 if(tail != NULL) {
2158 const char* pos = strchr(tail, '=');
2159 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2160 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2161 name[len] = '\0';
2163 char *options = NULL;
2164 if(pos != NULL) {
2165 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2166 }
2167 #ifdef JVMTI_KERNEL
2168 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2169 warning("profiling and debugging agents are not supported with Kernel VM");
2170 } else
2171 #endif // JVMTI_KERNEL
2172 add_init_agent(name, options, is_absolute_path);
2174 }
2175 // -javaagent
2176 } else if (match_option(option, "-javaagent:", &tail)) {
2177 if(tail != NULL) {
2178 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2179 add_init_agent("instrument", options, false);
2180 }
2181 // -Xnoclassgc
2182 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2183 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2184 // -Xincgc: i-CMS
2185 } else if (match_option(option, "-Xincgc", &tail)) {
2186 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2187 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2188 // -Xnoincgc: no i-CMS
2189 } else if (match_option(option, "-Xnoincgc", &tail)) {
2190 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2191 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2192 // -Xconcgc
2193 } else if (match_option(option, "-Xconcgc", &tail)) {
2194 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2195 // -Xnoconcgc
2196 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2197 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2198 // -Xbatch
2199 } else if (match_option(option, "-Xbatch", &tail)) {
2200 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2201 // -Xmn for compatibility with other JVM vendors
2202 } else if (match_option(option, "-Xmn", &tail)) {
2203 julong long_initial_eden_size = 0;
2204 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2205 if (errcode != arg_in_range) {
2206 jio_fprintf(defaultStream::error_stream(),
2207 "Invalid initial eden size: %s\n", option->optionString);
2208 describe_range_error(errcode);
2209 return JNI_EINVAL;
2210 }
2211 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2212 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2213 // -Xms
2214 } else if (match_option(option, "-Xms", &tail)) {
2215 julong long_initial_heap_size = 0;
2216 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2217 if (errcode != arg_in_range) {
2218 jio_fprintf(defaultStream::error_stream(),
2219 "Invalid initial heap size: %s\n", option->optionString);
2220 describe_range_error(errcode);
2221 return JNI_EINVAL;
2222 }
2223 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2224 // Currently the minimum size and the initial heap sizes are the same.
2225 set_min_heap_size(InitialHeapSize);
2226 // -Xmx
2227 } else if (match_option(option, "-Xmx", &tail)) {
2228 julong long_max_heap_size = 0;
2229 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2230 if (errcode != arg_in_range) {
2231 jio_fprintf(defaultStream::error_stream(),
2232 "Invalid maximum heap size: %s\n", option->optionString);
2233 describe_range_error(errcode);
2234 return JNI_EINVAL;
2235 }
2236 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2237 // Xmaxf
2238 } else if (match_option(option, "-Xmaxf", &tail)) {
2239 int maxf = (int)(atof(tail) * 100);
2240 if (maxf < 0 || maxf > 100) {
2241 jio_fprintf(defaultStream::error_stream(),
2242 "Bad max heap free percentage size: %s\n",
2243 option->optionString);
2244 return JNI_EINVAL;
2245 } else {
2246 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2247 }
2248 // Xminf
2249 } else if (match_option(option, "-Xminf", &tail)) {
2250 int minf = (int)(atof(tail) * 100);
2251 if (minf < 0 || minf > 100) {
2252 jio_fprintf(defaultStream::error_stream(),
2253 "Bad min heap free percentage size: %s\n",
2254 option->optionString);
2255 return JNI_EINVAL;
2256 } else {
2257 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2258 }
2259 // -Xss
2260 } else if (match_option(option, "-Xss", &tail)) {
2261 julong long_ThreadStackSize = 0;
2262 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2263 if (errcode != arg_in_range) {
2264 jio_fprintf(defaultStream::error_stream(),
2265 "Invalid thread stack size: %s\n", option->optionString);
2266 describe_range_error(errcode);
2267 return JNI_EINVAL;
2268 }
2269 // Internally track ThreadStackSize in units of 1024 bytes.
2270 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2271 round_to((int)long_ThreadStackSize, K) / K);
2272 // -Xoss
2273 } else if (match_option(option, "-Xoss", &tail)) {
2274 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2275 // -Xmaxjitcodesize
2276 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2277 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2278 julong long_ReservedCodeCacheSize = 0;
2279 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2280 (size_t)InitialCodeCacheSize);
2281 if (errcode != arg_in_range) {
2282 jio_fprintf(defaultStream::error_stream(),
2283 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2284 option->optionString, InitialCodeCacheSize/K);
2285 describe_range_error(errcode);
2286 return JNI_EINVAL;
2287 }
2288 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2289 // -green
2290 } else if (match_option(option, "-green", &tail)) {
2291 jio_fprintf(defaultStream::error_stream(),
2292 "Green threads support not available\n");
2293 return JNI_EINVAL;
2294 // -native
2295 } else if (match_option(option, "-native", &tail)) {
2296 // HotSpot always uses native threads, ignore silently for compatibility
2297 // -Xsqnopause
2298 } else if (match_option(option, "-Xsqnopause", &tail)) {
2299 // EVM option, ignore silently for compatibility
2300 // -Xrs
2301 } else if (match_option(option, "-Xrs", &tail)) {
2302 // Classic/EVM option, new functionality
2303 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2304 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2305 // change default internal VM signals used - lower case for back compat
2306 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2307 // -Xoptimize
2308 } else if (match_option(option, "-Xoptimize", &tail)) {
2309 // EVM option, ignore silently for compatibility
2310 // -Xprof
2311 } else if (match_option(option, "-Xprof", &tail)) {
2312 #ifndef FPROF_KERNEL
2313 _has_profile = true;
2314 #else // FPROF_KERNEL
2315 // do we have to exit?
2316 warning("Kernel VM does not support flat profiling.");
2317 #endif // FPROF_KERNEL
2318 // -Xaprof
2319 } else if (match_option(option, "-Xaprof", &tail)) {
2320 _has_alloc_profile = true;
2321 // -Xconcurrentio
2322 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2323 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2324 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2325 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2326 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2327 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2329 // -Xinternalversion
2330 } else if (match_option(option, "-Xinternalversion", &tail)) {
2331 jio_fprintf(defaultStream::output_stream(), "%s\n",
2332 VM_Version::internal_vm_info_string());
2333 vm_exit(0);
2334 #ifndef PRODUCT
2335 // -Xprintflags
2336 } else if (match_option(option, "-Xprintflags", &tail)) {
2337 CommandLineFlags::printFlags(tty, false);
2338 vm_exit(0);
2339 #endif
2340 // -D
2341 } else if (match_option(option, "-D", &tail)) {
2342 if (!add_property(tail)) {
2343 return JNI_ENOMEM;
2344 }
2345 // Out of the box management support
2346 if (match_option(option, "-Dcom.sun.management", &tail)) {
2347 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2348 }
2349 // -Xint
2350 } else if (match_option(option, "-Xint", &tail)) {
2351 set_mode_flags(_int);
2352 // -Xmixed
2353 } else if (match_option(option, "-Xmixed", &tail)) {
2354 set_mode_flags(_mixed);
2355 // -Xcomp
2356 } else if (match_option(option, "-Xcomp", &tail)) {
2357 // for testing the compiler; turn off all flags that inhibit compilation
2358 set_mode_flags(_comp);
2360 // -Xshare:dump
2361 } else if (match_option(option, "-Xshare:dump", &tail)) {
2362 #ifdef TIERED
2363 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2364 set_mode_flags(_int); // Prevent compilation, which creates objects
2365 #elif defined(COMPILER2)
2366 vm_exit_during_initialization(
2367 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2368 #elif defined(KERNEL)
2369 vm_exit_during_initialization(
2370 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2371 #else
2372 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2373 set_mode_flags(_int); // Prevent compilation, which creates objects
2374 #endif
2375 // -Xshare:on
2376 } else if (match_option(option, "-Xshare:on", &tail)) {
2377 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2378 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2379 // -Xshare:auto
2380 } else if (match_option(option, "-Xshare:auto", &tail)) {
2381 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2382 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2383 // -Xshare:off
2384 } else if (match_option(option, "-Xshare:off", &tail)) {
2385 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2386 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2388 // -Xverify
2389 } else if (match_option(option, "-Xverify", &tail)) {
2390 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2391 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2392 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2393 } else if (strcmp(tail, ":remote") == 0) {
2394 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2395 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2396 } else if (strcmp(tail, ":none") == 0) {
2397 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2398 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2399 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2400 return JNI_EINVAL;
2401 }
2402 // -Xdebug
2403 } else if (match_option(option, "-Xdebug", &tail)) {
2404 // note this flag has been used, then ignore
2405 set_xdebug_mode(true);
2406 // -Xnoagent
2407 } else if (match_option(option, "-Xnoagent", &tail)) {
2408 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2409 } else if (match_option(option, "-Xboundthreads", &tail)) {
2410 // Bind user level threads to kernel threads (Solaris only)
2411 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2412 } else if (match_option(option, "-Xloggc:", &tail)) {
2413 // Redirect GC output to the file. -Xloggc:<filename>
2414 // ostream_init_log(), when called will use this filename
2415 // to initialize a fileStream.
2416 _gc_log_filename = strdup(tail);
2417 FLAG_SET_CMDLINE(bool, PrintGC, true);
2418 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2420 // JNI hooks
2421 } else if (match_option(option, "-Xcheck", &tail)) {
2422 if (!strcmp(tail, ":jni")) {
2423 CheckJNICalls = true;
2424 } else if (is_bad_option(option, args->ignoreUnrecognized,
2425 "check")) {
2426 return JNI_EINVAL;
2427 }
2428 } else if (match_option(option, "vfprintf", &tail)) {
2429 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2430 } else if (match_option(option, "exit", &tail)) {
2431 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2432 } else if (match_option(option, "abort", &tail)) {
2433 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2434 // -XX:+AggressiveHeap
2435 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2437 // This option inspects the machine and attempts to set various
2438 // parameters to be optimal for long-running, memory allocation
2439 // intensive jobs. It is intended for machines with large
2440 // amounts of cpu and memory.
2442 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2443 // VM, but we may not be able to represent the total physical memory
2444 // available (like having 8gb of memory on a box but using a 32bit VM).
2445 // Thus, we need to make sure we're using a julong for intermediate
2446 // calculations.
2447 julong initHeapSize;
2448 julong total_memory = os::physical_memory();
2450 if (total_memory < (julong)256*M) {
2451 jio_fprintf(defaultStream::error_stream(),
2452 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2453 vm_exit(1);
2454 }
2456 // The heap size is half of available memory, or (at most)
2457 // all of possible memory less 160mb (leaving room for the OS
2458 // when using ISM). This is the maximum; because adaptive sizing
2459 // is turned on below, the actual space used may be smaller.
2461 initHeapSize = MIN2(total_memory / (julong)2,
2462 total_memory - (julong)160*M);
2464 // Make sure that if we have a lot of memory we cap the 32 bit
2465 // process space. The 64bit VM version of this function is a nop.
2466 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2468 // The perm gen is separate but contiguous with the
2469 // object heap (and is reserved with it) so subtract it
2470 // from the heap size.
2471 if (initHeapSize > MaxPermSize) {
2472 initHeapSize = initHeapSize - MaxPermSize;
2473 } else {
2474 warning("AggressiveHeap and MaxPermSize values may conflict");
2475 }
2477 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2478 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2479 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2480 // Currently the minimum size and the initial heap sizes are the same.
2481 set_min_heap_size(initHeapSize);
2482 }
2483 if (FLAG_IS_DEFAULT(NewSize)) {
2484 // Make the young generation 3/8ths of the total heap.
2485 FLAG_SET_CMDLINE(uintx, NewSize,
2486 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2487 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2488 }
2490 FLAG_SET_DEFAULT(UseLargePages, true);
2492 // Increase some data structure sizes for efficiency
2493 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2494 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2495 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2497 // See the OldPLABSize comment below, but replace 'after promotion'
2498 // with 'after copying'. YoungPLABSize is the size of the survivor
2499 // space per-gc-thread buffers. The default is 4kw.
2500 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2502 // OldPLABSize is the size of the buffers in the old gen that
2503 // UseParallelGC uses to promote live data that doesn't fit in the
2504 // survivor spaces. At any given time, there's one for each gc thread.
2505 // The default size is 1kw. These buffers are rarely used, since the
2506 // survivor spaces are usually big enough. For specjbb, however, there
2507 // are occasions when there's lots of live data in the young gen
2508 // and we end up promoting some of it. We don't have a definite
2509 // explanation for why bumping OldPLABSize helps, but the theory
2510 // is that a bigger PLAB results in retaining something like the
2511 // original allocation order after promotion, which improves mutator
2512 // locality. A minor effect may be that larger PLABs reduce the
2513 // number of PLAB allocation events during gc. The value of 8kw
2514 // was arrived at by experimenting with specjbb.
2515 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2517 // CompilationPolicyChoice=0 causes the server compiler to adopt
2518 // a more conservative which-method-do-I-compile policy when one
2519 // of the counters maintained by the interpreter trips. The
2520 // result is reduced startup time and improved specjbb and
2521 // alacrity performance. Zero is the default, but we set it
2522 // explicitly here in case the default changes.
2523 // See runtime/compilationPolicy.*.
2524 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2526 // Enable parallel GC and adaptive generation sizing
2527 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2528 FLAG_SET_DEFAULT(ParallelGCThreads,
2529 Abstract_VM_Version::parallel_worker_threads());
2531 // Encourage steady state memory management
2532 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2534 // This appears to improve mutator locality
2535 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2537 // Get around early Solaris scheduling bug
2538 // (affinity vs other jobs on system)
2539 // but disallow DR and offlining (5008695).
2540 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2542 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2543 // The last option must always win.
2544 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2545 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2546 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2547 // The last option must always win.
2548 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2549 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2550 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2551 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2552 jio_fprintf(defaultStream::error_stream(),
2553 "Please use CMSClassUnloadingEnabled in place of "
2554 "CMSPermGenSweepingEnabled in the future\n");
2555 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2556 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2557 jio_fprintf(defaultStream::error_stream(),
2558 "Please use -XX:+UseGCOverheadLimit in place of "
2559 "-XX:+UseGCTimeLimit in the future\n");
2560 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2561 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2562 jio_fprintf(defaultStream::error_stream(),
2563 "Please use -XX:-UseGCOverheadLimit in place of "
2564 "-XX:-UseGCTimeLimit in the future\n");
2565 // The TLE options are for compatibility with 1.3 and will be
2566 // removed without notice in a future release. These options
2567 // are not to be documented.
2568 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2569 // No longer used.
2570 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2571 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2572 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2573 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2574 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2575 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2576 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2577 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2578 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2579 // No longer used.
2580 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2581 julong long_tlab_size = 0;
2582 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2583 if (errcode != arg_in_range) {
2584 jio_fprintf(defaultStream::error_stream(),
2585 "Invalid TLAB size: %s\n", option->optionString);
2586 describe_range_error(errcode);
2587 return JNI_EINVAL;
2588 }
2589 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2590 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2591 // No longer used.
2592 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2593 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2594 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2595 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2596 SOLARIS_ONLY(
2597 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2598 warning("-XX:+UsePermISM is obsolete.");
2599 FLAG_SET_CMDLINE(bool, UseISM, true);
2600 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2601 FLAG_SET_CMDLINE(bool, UseISM, false);
2602 )
2603 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2604 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2605 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2606 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2607 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2608 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2609 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2610 #if defined(DTRACE_ENABLED)
2611 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2612 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2613 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2614 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2615 #else // defined(DTRACE_ENABLED)
2616 jio_fprintf(defaultStream::error_stream(),
2617 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2618 return JNI_EINVAL;
2619 #endif // defined(DTRACE_ENABLED)
2620 #ifdef ASSERT
2621 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2622 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2623 // disable scavenge before parallel mark-compact
2624 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2625 #endif
2626 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2627 julong cms_blocks_to_claim = (julong)atol(tail);
2628 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2629 jio_fprintf(defaultStream::error_stream(),
2630 "Please use -XX:OldPLABSize in place of "
2631 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2632 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2633 julong cms_blocks_to_claim = (julong)atol(tail);
2634 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2635 jio_fprintf(defaultStream::error_stream(),
2636 "Please use -XX:OldPLABSize in place of "
2637 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2638 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2639 julong old_plab_size = 0;
2640 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2641 if (errcode != arg_in_range) {
2642 jio_fprintf(defaultStream::error_stream(),
2643 "Invalid old PLAB size: %s\n", option->optionString);
2644 describe_range_error(errcode);
2645 return JNI_EINVAL;
2646 }
2647 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2648 jio_fprintf(defaultStream::error_stream(),
2649 "Please use -XX:OldPLABSize in place of "
2650 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2651 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2652 julong young_plab_size = 0;
2653 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2654 if (errcode != arg_in_range) {
2655 jio_fprintf(defaultStream::error_stream(),
2656 "Invalid young PLAB size: %s\n", option->optionString);
2657 describe_range_error(errcode);
2658 return JNI_EINVAL;
2659 }
2660 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2661 jio_fprintf(defaultStream::error_stream(),
2662 "Please use -XX:YoungPLABSize in place of "
2663 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2664 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2665 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2666 julong stack_size = 0;
2667 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2668 if (errcode != arg_in_range) {
2669 jio_fprintf(defaultStream::error_stream(),
2670 "Invalid mark stack size: %s\n", option->optionString);
2671 describe_range_error(errcode);
2672 return JNI_EINVAL;
2673 }
2674 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2675 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2676 julong max_stack_size = 0;
2677 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2678 if (errcode != arg_in_range) {
2679 jio_fprintf(defaultStream::error_stream(),
2680 "Invalid maximum mark stack size: %s\n",
2681 option->optionString);
2682 describe_range_error(errcode);
2683 return JNI_EINVAL;
2684 }
2685 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2686 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2687 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2688 uintx conc_threads = 0;
2689 if (!parse_uintx(tail, &conc_threads, 1)) {
2690 jio_fprintf(defaultStream::error_stream(),
2691 "Invalid concurrent threads: %s\n", option->optionString);
2692 return JNI_EINVAL;
2693 }
2694 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2695 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2696 // Skip -XX:Flags= since that case has already been handled
2697 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2698 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2699 return JNI_EINVAL;
2700 }
2701 }
2702 // Unknown option
2703 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2704 return JNI_ERR;
2705 }
2706 }
2708 // Change the default value for flags which have different default values
2709 // when working with older JDKs.
2710 if (JDK_Version::current().compare_major(6) <= 0 &&
2711 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2712 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2713 }
2714 #ifdef LINUX
2715 if (JDK_Version::current().compare_major(6) <= 0 &&
2716 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2717 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2718 }
2719 #endif // LINUX
2720 return JNI_OK;
2721 }
2723 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2724 // This must be done after all -D arguments have been processed.
2725 scp_p->expand_endorsed();
2727 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2728 // Assemble the bootclasspath elements into the final path.
2729 Arguments::set_sysclasspath(scp_p->combined_path());
2730 }
2732 // This must be done after all arguments have been processed.
2733 // java_compiler() true means set to "NONE" or empty.
2734 if (java_compiler() && !xdebug_mode()) {
2735 // For backwards compatibility, we switch to interpreted mode if
2736 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2737 // not specified.
2738 set_mode_flags(_int);
2739 }
2740 if (CompileThreshold == 0) {
2741 set_mode_flags(_int);
2742 }
2744 #ifndef COMPILER2
2745 // Don't degrade server performance for footprint
2746 if (FLAG_IS_DEFAULT(UseLargePages) &&
2747 MaxHeapSize < LargePageHeapSizeThreshold) {
2748 // No need for large granularity pages w/small heaps.
2749 // Note that large pages are enabled/disabled for both the
2750 // Java heap and the code cache.
2751 FLAG_SET_DEFAULT(UseLargePages, false);
2752 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2753 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2754 }
2756 // Tiered compilation is undefined with C1.
2757 TieredCompilation = false;
2758 #else
2759 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2760 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2761 }
2762 #endif
2764 // If we are running in a headless jre, force java.awt.headless property
2765 // to be true unless the property has already been set.
2766 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2767 if (os::is_headless_jre()) {
2768 const char* headless = Arguments::get_property("java.awt.headless");
2769 if (headless == NULL) {
2770 char envbuffer[128];
2771 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2772 if (!add_property("java.awt.headless=true")) {
2773 return JNI_ENOMEM;
2774 }
2775 } else {
2776 char buffer[256];
2777 strcpy(buffer, "java.awt.headless=");
2778 strcat(buffer, envbuffer);
2779 if (!add_property(buffer)) {
2780 return JNI_ENOMEM;
2781 }
2782 }
2783 }
2784 }
2786 if (!check_vm_args_consistency()) {
2787 return JNI_ERR;
2788 }
2790 return JNI_OK;
2791 }
2793 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2794 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2795 scp_assembly_required_p);
2796 }
2798 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2799 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2800 scp_assembly_required_p);
2801 }
2803 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2804 const int N_MAX_OPTIONS = 64;
2805 const int OPTION_BUFFER_SIZE = 1024;
2806 char buffer[OPTION_BUFFER_SIZE];
2808 // The variable will be ignored if it exceeds the length of the buffer.
2809 // Don't check this variable if user has special privileges
2810 // (e.g. unix su command).
2811 if (os::getenv(name, buffer, sizeof(buffer)) &&
2812 !os::have_special_privileges()) {
2813 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2814 jio_fprintf(defaultStream::error_stream(),
2815 "Picked up %s: %s\n", name, buffer);
2816 char* rd = buffer; // pointer to the input string (rd)
2817 int i;
2818 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2819 while (isspace(*rd)) rd++; // skip whitespace
2820 if (*rd == 0) break; // we re done when the input string is read completely
2822 // The output, option string, overwrites the input string.
2823 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2824 // input string (rd).
2825 char* wrt = rd;
2827 options[i++].optionString = wrt; // Fill in option
2828 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2829 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2830 int quote = *rd; // matching quote to look for
2831 rd++; // don't copy open quote
2832 while (*rd != quote) { // include everything (even spaces) up until quote
2833 if (*rd == 0) { // string termination means unmatched string
2834 jio_fprintf(defaultStream::error_stream(),
2835 "Unmatched quote in %s\n", name);
2836 return JNI_ERR;
2837 }
2838 *wrt++ = *rd++; // copy to option string
2839 }
2840 rd++; // don't copy close quote
2841 } else {
2842 *wrt++ = *rd++; // copy to option string
2843 }
2844 }
2845 // Need to check if we're done before writing a NULL,
2846 // because the write could be to the byte that rd is pointing to.
2847 if (*rd++ == 0) {
2848 *wrt = 0;
2849 break;
2850 }
2851 *wrt = 0; // Zero terminate option
2852 }
2853 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2854 JavaVMInitArgs vm_args;
2855 vm_args.version = JNI_VERSION_1_2;
2856 vm_args.options = options;
2857 vm_args.nOptions = i;
2858 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2860 if (PrintVMOptions) {
2861 const char* tail;
2862 for (int i = 0; i < vm_args.nOptions; i++) {
2863 const JavaVMOption *option = vm_args.options + i;
2864 if (match_option(option, "-XX:", &tail)) {
2865 logOption(tail);
2866 }
2867 }
2868 }
2870 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2871 }
2872 return JNI_OK;
2873 }
2875 void Arguments::set_shared_spaces_flags() {
2876 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
2877 const bool might_share = must_share || UseSharedSpaces;
2879 // The string table is part of the shared archive so the size must match.
2880 if (!FLAG_IS_DEFAULT(StringTableSize)) {
2881 // Disable sharing.
2882 if (must_share) {
2883 warning("disabling shared archive %s because of non-default "
2884 "StringTableSize", DumpSharedSpaces ? "creation" : "use");
2885 }
2886 if (might_share) {
2887 FLAG_SET_DEFAULT(DumpSharedSpaces, false);
2888 FLAG_SET_DEFAULT(RequireSharedSpaces, false);
2889 FLAG_SET_DEFAULT(UseSharedSpaces, false);
2890 }
2891 return;
2892 }
2894 // Check whether class data sharing settings conflict with GC, compressed oops
2895 // or page size, and fix them up. Explicit sharing options override other
2896 // settings.
2897 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
2898 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
2899 UseCompressedOops || UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
2900 if (cannot_share) {
2901 if (must_share) {
2902 warning("selecting serial gc and disabling large pages %s"
2903 "because of %s", "" LP64_ONLY("and compressed oops "),
2904 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
2905 force_serial_gc();
2906 FLAG_SET_CMDLINE(bool, UseLargePages, false);
2907 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
2908 } else {
2909 if (UseSharedSpaces && Verbose) {
2910 warning("turning off use of shared archive because of "
2911 "choice of garbage collector or large pages");
2912 }
2913 no_shared_spaces();
2914 }
2915 } else if (UseLargePages && might_share) {
2916 // Disable large pages to allow shared spaces. This is sub-optimal, since
2917 // there may not even be a shared archive to use.
2918 FLAG_SET_DEFAULT(UseLargePages, false);
2919 }
2920 }
2922 // Disable options not supported in this release, with a warning if they
2923 // were explicitly requested on the command-line
2924 #define UNSUPPORTED_OPTION(opt, description) \
2925 do { \
2926 if (opt) { \
2927 if (FLAG_IS_CMDLINE(opt)) { \
2928 warning(description " is disabled in this release."); \
2929 } \
2930 FLAG_SET_DEFAULT(opt, false); \
2931 } \
2932 } while(0)
2934 // Parse entry point called from JNI_CreateJavaVM
2936 jint Arguments::parse(const JavaVMInitArgs* args) {
2938 // Sharing support
2939 // Construct the path to the archive
2940 char jvm_path[JVM_MAXPATHLEN];
2941 os::jvm_path(jvm_path, sizeof(jvm_path));
2942 #ifdef TIERED
2943 if (strstr(jvm_path, "client") != NULL) {
2944 force_client_mode = true;
2945 }
2946 #endif // TIERED
2947 char *end = strrchr(jvm_path, *os::file_separator());
2948 if (end != NULL) *end = '\0';
2949 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2950 strlen(os::file_separator()) + 20);
2951 if (shared_archive_path == NULL) return JNI_ENOMEM;
2952 strcpy(shared_archive_path, jvm_path);
2953 strcat(shared_archive_path, os::file_separator());
2954 strcat(shared_archive_path, "classes");
2955 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2956 strcat(shared_archive_path, ".jsa");
2957 SharedArchivePath = shared_archive_path;
2959 // Remaining part of option string
2960 const char* tail;
2962 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2963 bool settings_file_specified = false;
2964 const char* flags_file;
2965 int index;
2966 for (index = 0; index < args->nOptions; index++) {
2967 const JavaVMOption *option = args->options + index;
2968 if (match_option(option, "-XX:Flags=", &tail)) {
2969 flags_file = tail;
2970 settings_file_specified = true;
2971 }
2972 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2973 PrintVMOptions = true;
2974 }
2975 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2976 PrintVMOptions = false;
2977 }
2978 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2979 IgnoreUnrecognizedVMOptions = true;
2980 }
2981 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2982 IgnoreUnrecognizedVMOptions = false;
2983 }
2984 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2985 CommandLineFlags::printFlags(tty, false);
2986 vm_exit(0);
2987 }
2989 #ifndef PRODUCT
2990 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
2991 CommandLineFlags::printFlags(tty, true);
2992 vm_exit(0);
2993 }
2994 #endif
2995 }
2997 if (IgnoreUnrecognizedVMOptions) {
2998 // uncast const to modify the flag args->ignoreUnrecognized
2999 *(jboolean*)(&args->ignoreUnrecognized) = true;
3000 }
3002 // Parse specified settings file
3003 if (settings_file_specified) {
3004 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3005 return JNI_EINVAL;
3006 }
3007 }
3009 // Parse default .hotspotrc settings file
3010 if (!settings_file_specified) {
3011 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3012 return JNI_EINVAL;
3013 }
3014 }
3016 if (PrintVMOptions) {
3017 for (index = 0; index < args->nOptions; index++) {
3018 const JavaVMOption *option = args->options + index;
3019 if (match_option(option, "-XX:", &tail)) {
3020 logOption(tail);
3021 }
3022 }
3023 }
3025 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3026 jint result = parse_vm_init_args(args);
3027 if (result != JNI_OK) {
3028 return result;
3029 }
3031 #ifdef JAVASE_EMBEDDED
3032 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3033 #endif
3035 #ifndef PRODUCT
3036 if (TraceBytecodesAt != 0) {
3037 TraceBytecodes = true;
3038 }
3039 if (CountCompiledCalls) {
3040 if (UseCounterDecay) {
3041 warning("UseCounterDecay disabled because CountCalls is set");
3042 UseCounterDecay = false;
3043 }
3044 }
3045 #endif // PRODUCT
3047 // Transitional
3048 if (EnableMethodHandles || AnonymousClasses) {
3049 if (!EnableInvokeDynamic && !FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3050 warning("EnableMethodHandles and AnonymousClasses are obsolete. Keeping EnableInvokeDynamic disabled.");
3051 } else {
3052 EnableInvokeDynamic = true;
3053 }
3054 }
3056 // JSR 292 is not supported before 1.7
3057 if (!JDK_Version::is_gte_jdk17x_version()) {
3058 if (EnableInvokeDynamic) {
3059 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3060 warning("JSR 292 is not supported before 1.7. Disabling support.");
3061 }
3062 EnableInvokeDynamic = false;
3063 }
3064 }
3066 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3067 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3068 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3069 }
3070 ScavengeRootsInCode = 1;
3071 }
3072 if (!JavaObjectsInPerm && ScavengeRootsInCode == 0) {
3073 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3074 warning("forcing ScavengeRootsInCode non-zero because JavaObjectsInPerm is false");
3075 }
3076 ScavengeRootsInCode = 1;
3077 }
3079 if (PrintGCDetails) {
3080 // Turn on -verbose:gc options as well
3081 PrintGC = true;
3082 }
3084 // Set object alignment values.
3085 set_object_alignment();
3087 #ifdef SERIALGC
3088 force_serial_gc();
3089 #endif // SERIALGC
3090 #ifdef KERNEL
3091 no_shared_spaces();
3092 #endif // KERNEL
3094 // Set flags based on ergonomics.
3095 set_ergonomics_flags();
3097 set_shared_spaces_flags();
3099 // Check the GC selections again.
3100 if (!check_gc_consistency()) {
3101 return JNI_EINVAL;
3102 }
3104 if (TieredCompilation) {
3105 set_tiered_flags();
3106 } else {
3107 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3108 if (CompilationPolicyChoice >= 2) {
3109 vm_exit_during_initialization(
3110 "Incompatible compilation policy selected", NULL);
3111 }
3112 }
3114 #ifndef KERNEL
3115 // Set heap size based on available physical memory
3116 set_heap_size();
3117 // Set per-collector flags
3118 if (UseParallelGC || UseParallelOldGC) {
3119 set_parallel_gc_flags();
3120 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3121 set_cms_and_parnew_gc_flags();
3122 } else if (UseParNewGC) { // skipped if CMS is set above
3123 set_parnew_gc_flags();
3124 } else if (UseG1GC) {
3125 set_g1_gc_flags();
3126 }
3127 #endif // KERNEL
3129 #ifdef SERIALGC
3130 assert(verify_serial_gc_flags(), "SerialGC unset");
3131 #endif // SERIALGC
3133 // Set bytecode rewriting flags
3134 set_bytecode_flags();
3136 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3137 set_aggressive_opts_flags();
3139 // Turn off biased locking for locking debug mode flags,
3140 // which are subtlely different from each other but neither works with
3141 // biased locking.
3142 if (UseHeavyMonitors
3143 #ifdef COMPILER1
3144 || !UseFastLocking
3145 #endif // COMPILER1
3146 ) {
3147 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3148 // flag set to true on command line; warn the user that they
3149 // can't enable biased locking here
3150 warning("Biased Locking is not supported with locking debug flags"
3151 "; ignoring UseBiasedLocking flag." );
3152 }
3153 UseBiasedLocking = false;
3154 }
3156 #ifdef CC_INTERP
3157 // Clear flags not supported by the C++ interpreter
3158 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3159 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3160 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3161 #endif // CC_INTERP
3163 #ifdef COMPILER2
3164 if (!UseBiasedLocking || EmitSync != 0) {
3165 UseOptoBiasInlining = false;
3166 }
3167 if (!EliminateLocks) {
3168 EliminateNestedLocks = false;
3169 }
3170 #endif
3172 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3173 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3174 DebugNonSafepoints = true;
3175 }
3177 #ifndef PRODUCT
3178 if (CompileTheWorld) {
3179 // Force NmethodSweeper to sweep whole CodeCache each time.
3180 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3181 NmethodSweepFraction = 1;
3182 }
3183 }
3184 #endif
3186 if (PrintCommandLineFlags) {
3187 CommandLineFlags::printSetFlags(tty);
3188 }
3190 // Apply CPU specific policy for the BiasedLocking
3191 if (UseBiasedLocking) {
3192 if (!VM_Version::use_biased_locking() &&
3193 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3194 UseBiasedLocking = false;
3195 }
3196 }
3198 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3199 // but only if not already set on the commandline
3200 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3201 bool set = false;
3202 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3203 if (!set) {
3204 FLAG_SET_DEFAULT(PauseAtExit, true);
3205 }
3206 }
3208 return JNI_OK;
3209 }
3211 int Arguments::PropertyList_count(SystemProperty* pl) {
3212 int count = 0;
3213 while(pl != NULL) {
3214 count++;
3215 pl = pl->next();
3216 }
3217 return count;
3218 }
3220 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3221 assert(key != NULL, "just checking");
3222 SystemProperty* prop;
3223 for (prop = pl; prop != NULL; prop = prop->next()) {
3224 if (strcmp(key, prop->key()) == 0) return prop->value();
3225 }
3226 return NULL;
3227 }
3229 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3230 int count = 0;
3231 const char* ret_val = NULL;
3233 while(pl != NULL) {
3234 if(count >= index) {
3235 ret_val = pl->key();
3236 break;
3237 }
3238 count++;
3239 pl = pl->next();
3240 }
3242 return ret_val;
3243 }
3245 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3246 int count = 0;
3247 char* ret_val = NULL;
3249 while(pl != NULL) {
3250 if(count >= index) {
3251 ret_val = pl->value();
3252 break;
3253 }
3254 count++;
3255 pl = pl->next();
3256 }
3258 return ret_val;
3259 }
3261 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3262 SystemProperty* p = *plist;
3263 if (p == NULL) {
3264 *plist = new_p;
3265 } else {
3266 while (p->next() != NULL) {
3267 p = p->next();
3268 }
3269 p->set_next(new_p);
3270 }
3271 }
3273 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3274 if (plist == NULL)
3275 return;
3277 SystemProperty* new_p = new SystemProperty(k, v, true);
3278 PropertyList_add(plist, new_p);
3279 }
3281 // This add maintains unique property key in the list.
3282 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3283 if (plist == NULL)
3284 return;
3286 // If property key exist then update with new value.
3287 SystemProperty* prop;
3288 for (prop = *plist; prop != NULL; prop = prop->next()) {
3289 if (strcmp(k, prop->key()) == 0) {
3290 if (append) {
3291 prop->append_value(v);
3292 } else {
3293 prop->set_value(v);
3294 }
3295 return;
3296 }
3297 }
3299 PropertyList_add(plist, k, v);
3300 }
3302 #ifdef KERNEL
3303 char *Arguments::get_kernel_properties() {
3304 // Find properties starting with kernel and append them to string
3305 // We need to find out how long they are first because the URL's that they
3306 // might point to could get long.
3307 int length = 0;
3308 SystemProperty* prop;
3309 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3310 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3311 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3312 }
3313 }
3314 // Add one for null terminator.
3315 char *props = AllocateHeap(length + 1, "get_kernel_properties");
3316 if (length != 0) {
3317 int pos = 0;
3318 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3319 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3320 jio_snprintf(&props[pos], length-pos,
3321 "-D%s=%s ", prop->key(), prop->value());
3322 pos = strlen(props);
3323 }
3324 }
3325 }
3326 // null terminate props in case of null
3327 props[length] = '\0';
3328 return props;
3329 }
3330 #endif // KERNEL
3332 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3333 // Returns true if all of the source pointed by src has been copied over to
3334 // the destination buffer pointed by buf. Otherwise, returns false.
3335 // Notes:
3336 // 1. If the length (buflen) of the destination buffer excluding the
3337 // NULL terminator character is not long enough for holding the expanded
3338 // pid characters, it also returns false instead of returning the partially
3339 // expanded one.
3340 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3341 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3342 char* buf, size_t buflen) {
3343 const char* p = src;
3344 char* b = buf;
3345 const char* src_end = &src[srclen];
3346 char* buf_end = &buf[buflen - 1];
3348 while (p < src_end && b < buf_end) {
3349 if (*p == '%') {
3350 switch (*(++p)) {
3351 case '%': // "%%" ==> "%"
3352 *b++ = *p++;
3353 break;
3354 case 'p': { // "%p" ==> current process id
3355 // buf_end points to the character before the last character so
3356 // that we could write '\0' to the end of the buffer.
3357 size_t buf_sz = buf_end - b + 1;
3358 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3360 // if jio_snprintf fails or the buffer is not long enough to hold
3361 // the expanded pid, returns false.
3362 if (ret < 0 || ret >= (int)buf_sz) {
3363 return false;
3364 } else {
3365 b += ret;
3366 assert(*b == '\0', "fail in copy_expand_pid");
3367 if (p == src_end && b == buf_end + 1) {
3368 // reach the end of the buffer.
3369 return true;
3370 }
3371 }
3372 p++;
3373 break;
3374 }
3375 default :
3376 *b++ = '%';
3377 }
3378 } else {
3379 *b++ = *p++;
3380 }
3381 }
3382 *b = '\0';
3383 return (p == src_end); // return false if not all of the source was copied
3384 }