Tue, 30 Oct 2012 13:56:59 -0700
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 "services/memTracker.hpp"
39 #include "utilities/defaultStream.hpp"
40 #include "utilities/taskqueue.hpp"
41 #ifdef TARGET_OS_FAMILY_linux
42 # include "os_linux.inline.hpp"
43 #endif
44 #ifdef TARGET_OS_FAMILY_solaris
45 # include "os_solaris.inline.hpp"
46 #endif
47 #ifdef TARGET_OS_FAMILY_windows
48 # include "os_windows.inline.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_bsd
51 # include "os_bsd.inline.hpp"
52 #endif
53 #ifndef SERIALGC
54 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
55 #endif
57 // Note: This is a special bug reporting site for the JVM
58 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
59 #define DEFAULT_JAVA_LAUNCHER "generic"
61 char** Arguments::_jvm_flags_array = NULL;
62 int Arguments::_num_jvm_flags = 0;
63 char** Arguments::_jvm_args_array = NULL;
64 int Arguments::_num_jvm_args = 0;
65 char* Arguments::_java_command = NULL;
66 SystemProperty* Arguments::_system_properties = NULL;
67 const char* Arguments::_gc_log_filename = NULL;
68 bool Arguments::_has_profile = false;
69 bool Arguments::_has_alloc_profile = false;
70 uintx Arguments::_min_heap_size = 0;
71 Arguments::Mode Arguments::_mode = _mixed;
72 bool Arguments::_java_compiler = false;
73 bool Arguments::_xdebug_mode = false;
74 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
75 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
76 int Arguments::_sun_java_launcher_pid = -1;
77 bool Arguments::_created_by_gamma_launcher = false;
79 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
80 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
81 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
82 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
83 bool Arguments::_ClipInlining = ClipInlining;
85 char* Arguments::SharedArchivePath = NULL;
87 AgentLibraryList Arguments::_libraryList;
88 AgentLibraryList Arguments::_agentList;
90 abort_hook_t Arguments::_abort_hook = NULL;
91 exit_hook_t Arguments::_exit_hook = NULL;
92 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
95 SystemProperty *Arguments::_java_ext_dirs = NULL;
96 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
97 SystemProperty *Arguments::_sun_boot_library_path = NULL;
98 SystemProperty *Arguments::_java_library_path = NULL;
99 SystemProperty *Arguments::_java_home = NULL;
100 SystemProperty *Arguments::_java_class_path = NULL;
101 SystemProperty *Arguments::_sun_boot_class_path = NULL;
103 char* Arguments::_meta_index_path = NULL;
104 char* Arguments::_meta_index_dir = NULL;
106 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
108 static bool match_option(const JavaVMOption *option, const char* name,
109 const char** tail) {
110 int len = (int)strlen(name);
111 if (strncmp(option->optionString, name, len) == 0) {
112 *tail = option->optionString + len;
113 return true;
114 } else {
115 return false;
116 }
117 }
119 static void logOption(const char* opt) {
120 if (PrintVMOptions) {
121 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
122 }
123 }
125 // Process java launcher properties.
126 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
127 // See if sun.java.launcher or sun.java.launcher.pid is defined.
128 // Must do this before setting up other system properties,
129 // as some of them may depend on launcher type.
130 for (int index = 0; index < args->nOptions; index++) {
131 const JavaVMOption* option = args->options + index;
132 const char* tail;
134 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
135 process_java_launcher_argument(tail, option->extraInfo);
136 continue;
137 }
138 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
139 _sun_java_launcher_pid = atoi(tail);
140 continue;
141 }
142 }
143 }
145 // Initialize system properties key and value.
146 void Arguments::init_system_properties() {
148 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
149 "Java Virtual Machine Specification", false));
150 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
154 // following are JVMTI agent writeable properties.
155 // Properties values are set to NULL and they are
156 // os specific they are initialized in os::init_system_properties_values().
157 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
158 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
159 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
160 _java_library_path = new SystemProperty("java.library.path", NULL, true);
161 _java_home = new SystemProperty("java.home", NULL, true);
162 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
164 _java_class_path = new SystemProperty("java.class.path", "", true);
166 // Add to System Property list.
167 PropertyList_add(&_system_properties, _java_ext_dirs);
168 PropertyList_add(&_system_properties, _java_endorsed_dirs);
169 PropertyList_add(&_system_properties, _sun_boot_library_path);
170 PropertyList_add(&_system_properties, _java_library_path);
171 PropertyList_add(&_system_properties, _java_home);
172 PropertyList_add(&_system_properties, _java_class_path);
173 PropertyList_add(&_system_properties, _sun_boot_class_path);
175 // Set OS specific system properties values
176 os::init_system_properties_values();
177 }
180 // Update/Initialize System properties after JDK version number is known
181 void Arguments::init_version_specific_system_properties() {
182 enum { bufsz = 16 };
183 char buffer[bufsz];
184 const char* spec_vendor = "Sun Microsystems Inc.";
185 uint32_t spec_version = 0;
187 if (JDK_Version::is_gte_jdk17x_version()) {
188 spec_vendor = "Oracle Corporation";
189 spec_version = JDK_Version::current().major_version();
190 }
191 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
193 PropertyList_add(&_system_properties,
194 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
195 PropertyList_add(&_system_properties,
196 new SystemProperty("java.vm.specification.version", buffer, false));
197 PropertyList_add(&_system_properties,
198 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
199 }
201 /**
202 * Provide a slightly more user-friendly way of eliminating -XX flags.
203 * When a flag is eliminated, it can be added to this list in order to
204 * continue accepting this flag on the command-line, while issuing a warning
205 * and ignoring the value. Once the JDK version reaches the 'accept_until'
206 * limit, we flatly refuse to admit the existence of the flag. This allows
207 * a flag to die correctly over JDK releases using HSX.
208 */
209 typedef struct {
210 const char* name;
211 JDK_Version obsoleted_in; // when the flag went away
212 JDK_Version accept_until; // which version to start denying the existence
213 } ObsoleteFlag;
215 static ObsoleteFlag obsolete_jvm_flags[] = {
216 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
217 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
218 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
230 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
231 { "DefaultInitialRAMFraction",
232 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
233 { "UseDepthFirstScavengeOrder",
234 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
235 { "HandlePromotionFailure",
236 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
237 { "MaxLiveObjectEvacuationRatio",
238 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
239 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
240 { "UseParallelOldGCCompacting",
241 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
242 { "UseParallelDensePrefixUpdate",
243 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
244 { "UseParallelOldGCDensePrefix",
245 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
246 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
247 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
248 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
249 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
250 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
251 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
252 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
253 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
254 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
255 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
256 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
257 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
258 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
259 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
260 #ifdef PRODUCT
261 { "DesiredMethodLimit",
262 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
263 #endif // PRODUCT
264 { NULL, JDK_Version(0), JDK_Version(0) }
265 };
267 // Returns true if the flag is obsolete and fits into the range specified
268 // for being ignored. In the case that the flag is ignored, the 'version'
269 // value is filled in with the version number when the flag became
270 // obsolete so that that value can be displayed to the user.
271 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
272 int i = 0;
273 assert(version != NULL, "Must provide a version buffer");
274 while (obsolete_jvm_flags[i].name != NULL) {
275 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
276 // <flag>=xxx form
277 // [-|+]<flag> form
278 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
279 ((s[0] == '+' || s[0] == '-') &&
280 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
281 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
282 *version = flag_status.obsoleted_in;
283 return true;
284 }
285 }
286 i++;
287 }
288 return false;
289 }
291 // Constructs the system class path (aka boot class path) from the following
292 // components, in order:
293 //
294 // prefix // from -Xbootclasspath/p:...
295 // endorsed // the expansion of -Djava.endorsed.dirs=...
296 // base // from os::get_system_properties() or -Xbootclasspath=
297 // suffix // from -Xbootclasspath/a:...
298 //
299 // java.endorsed.dirs is a list of directories; any jar or zip files in the
300 // directories are added to the sysclasspath just before the base.
301 //
302 // This could be AllStatic, but it isn't needed after argument processing is
303 // complete.
304 class SysClassPath: public StackObj {
305 public:
306 SysClassPath(const char* base);
307 ~SysClassPath();
309 inline void set_base(const char* base);
310 inline void add_prefix(const char* prefix);
311 inline void add_suffix_to_prefix(const char* suffix);
312 inline void add_suffix(const char* suffix);
313 inline void reset_path(const char* base);
315 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
316 // property. Must be called after all command-line arguments have been
317 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
318 // combined_path().
319 void expand_endorsed();
321 inline const char* get_base() const { return _items[_scp_base]; }
322 inline const char* get_prefix() const { return _items[_scp_prefix]; }
323 inline const char* get_suffix() const { return _items[_scp_suffix]; }
324 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
326 // Combine all the components into a single c-heap-allocated string; caller
327 // must free the string if/when no longer needed.
328 char* combined_path();
330 private:
331 // Utility routines.
332 static char* add_to_path(const char* path, const char* str, bool prepend);
333 static char* add_jars_to_path(char* path, const char* directory);
335 inline void reset_item_at(int index);
337 // Array indices for the items that make up the sysclasspath. All except the
338 // base are allocated in the C heap and freed by this class.
339 enum {
340 _scp_prefix, // from -Xbootclasspath/p:...
341 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
342 _scp_base, // the default sysclasspath
343 _scp_suffix, // from -Xbootclasspath/a:...
344 _scp_nitems // the number of items, must be last.
345 };
347 const char* _items[_scp_nitems];
348 DEBUG_ONLY(bool _expansion_done;)
349 };
351 SysClassPath::SysClassPath(const char* base) {
352 memset(_items, 0, sizeof(_items));
353 _items[_scp_base] = base;
354 DEBUG_ONLY(_expansion_done = false;)
355 }
357 SysClassPath::~SysClassPath() {
358 // Free everything except the base.
359 for (int i = 0; i < _scp_nitems; ++i) {
360 if (i != _scp_base) reset_item_at(i);
361 }
362 DEBUG_ONLY(_expansion_done = false;)
363 }
365 inline void SysClassPath::set_base(const char* base) {
366 _items[_scp_base] = base;
367 }
369 inline void SysClassPath::add_prefix(const char* prefix) {
370 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
371 }
373 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
374 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
375 }
377 inline void SysClassPath::add_suffix(const char* suffix) {
378 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
379 }
381 inline void SysClassPath::reset_item_at(int index) {
382 assert(index < _scp_nitems && index != _scp_base, "just checking");
383 if (_items[index] != NULL) {
384 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
385 _items[index] = NULL;
386 }
387 }
389 inline void SysClassPath::reset_path(const char* base) {
390 // Clear the prefix and suffix.
391 reset_item_at(_scp_prefix);
392 reset_item_at(_scp_suffix);
393 set_base(base);
394 }
396 //------------------------------------------------------------------------------
398 void SysClassPath::expand_endorsed() {
399 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
401 const char* path = Arguments::get_property("java.endorsed.dirs");
402 if (path == NULL) {
403 path = Arguments::get_endorsed_dir();
404 assert(path != NULL, "no default for java.endorsed.dirs");
405 }
407 char* expanded_path = NULL;
408 const char separator = *os::path_separator();
409 const char* const end = path + strlen(path);
410 while (path < end) {
411 const char* tmp_end = strchr(path, separator);
412 if (tmp_end == NULL) {
413 expanded_path = add_jars_to_path(expanded_path, path);
414 path = end;
415 } else {
416 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
417 memcpy(dirpath, path, tmp_end - path);
418 dirpath[tmp_end - path] = '\0';
419 expanded_path = add_jars_to_path(expanded_path, dirpath);
420 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
421 path = tmp_end + 1;
422 }
423 }
424 _items[_scp_endorsed] = expanded_path;
425 DEBUG_ONLY(_expansion_done = true;)
426 }
428 // Combine the bootclasspath elements, some of which may be null, into a single
429 // c-heap-allocated string.
430 char* SysClassPath::combined_path() {
431 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
432 assert(_expansion_done, "must call expand_endorsed() first.");
434 size_t lengths[_scp_nitems];
435 size_t total_len = 0;
437 const char separator = *os::path_separator();
439 // Get the lengths.
440 int i;
441 for (i = 0; i < _scp_nitems; ++i) {
442 if (_items[i] != NULL) {
443 lengths[i] = strlen(_items[i]);
444 // Include space for the separator char (or a NULL for the last item).
445 total_len += lengths[i] + 1;
446 }
447 }
448 assert(total_len > 0, "empty sysclasspath not allowed");
450 // Copy the _items to a single string.
451 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
452 char* cp_tmp = cp;
453 for (i = 0; i < _scp_nitems; ++i) {
454 if (_items[i] != NULL) {
455 memcpy(cp_tmp, _items[i], lengths[i]);
456 cp_tmp += lengths[i];
457 *cp_tmp++ = separator;
458 }
459 }
460 *--cp_tmp = '\0'; // Replace the extra separator.
461 return cp;
462 }
464 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
465 char*
466 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
467 char *cp;
469 assert(str != NULL, "just checking");
470 if (path == NULL) {
471 size_t len = strlen(str) + 1;
472 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
473 memcpy(cp, str, len); // copy the trailing null
474 } else {
475 const char separator = *os::path_separator();
476 size_t old_len = strlen(path);
477 size_t str_len = strlen(str);
478 size_t len = old_len + str_len + 2;
480 if (prepend) {
481 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
482 char* cp_tmp = cp;
483 memcpy(cp_tmp, str, str_len);
484 cp_tmp += str_len;
485 *cp_tmp = separator;
486 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
487 FREE_C_HEAP_ARRAY(char, path, mtInternal);
488 } else {
489 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
490 char* cp_tmp = cp + old_len;
491 *cp_tmp = separator;
492 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
493 }
494 }
495 return cp;
496 }
498 // Scan the directory and append any jar or zip files found to path.
499 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
500 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
501 DIR* dir = os::opendir(directory);
502 if (dir == NULL) return path;
504 char dir_sep[2] = { '\0', '\0' };
505 size_t directory_len = strlen(directory);
506 const char fileSep = *os::file_separator();
507 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
509 /* Scan the directory for jars/zips, appending them to path. */
510 struct dirent *entry;
511 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
512 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
513 const char* name = entry->d_name;
514 const char* ext = name + strlen(name) - 4;
515 bool isJarOrZip = ext > name &&
516 (os::file_name_strcmp(ext, ".jar") == 0 ||
517 os::file_name_strcmp(ext, ".zip") == 0);
518 if (isJarOrZip) {
519 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
520 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
521 path = add_to_path(path, jarpath, false);
522 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
523 }
524 }
525 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
526 os::closedir(dir);
527 return path;
528 }
530 // Parses a memory size specification string.
531 static bool atomull(const char *s, julong* result) {
532 julong n = 0;
533 int args_read = sscanf(s, os::julong_format_specifier(), &n);
534 if (args_read != 1) {
535 return false;
536 }
537 while (*s != '\0' && isdigit(*s)) {
538 s++;
539 }
540 // 4705540: illegal if more characters are found after the first non-digit
541 if (strlen(s) > 1) {
542 return false;
543 }
544 switch (*s) {
545 case 'T': case 't':
546 *result = n * G * K;
547 // Check for overflow.
548 if (*result/((julong)G * K) != n) return false;
549 return true;
550 case 'G': case 'g':
551 *result = n * G;
552 if (*result/G != n) return false;
553 return true;
554 case 'M': case 'm':
555 *result = n * M;
556 if (*result/M != n) return false;
557 return true;
558 case 'K': case 'k':
559 *result = n * K;
560 if (*result/K != n) return false;
561 return true;
562 case '\0':
563 *result = n;
564 return true;
565 default:
566 return false;
567 }
568 }
570 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
571 if (size < min_size) return arg_too_small;
572 // Check that size will fit in a size_t (only relevant on 32-bit)
573 if (size > max_uintx) return arg_too_big;
574 return arg_in_range;
575 }
577 // Describe an argument out of range error
578 void Arguments::describe_range_error(ArgsRange errcode) {
579 switch(errcode) {
580 case arg_too_big:
581 jio_fprintf(defaultStream::error_stream(),
582 "The specified size exceeds the maximum "
583 "representable size.\n");
584 break;
585 case arg_too_small:
586 case arg_unreadable:
587 case arg_in_range:
588 // do nothing for now
589 break;
590 default:
591 ShouldNotReachHere();
592 }
593 }
595 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
596 return CommandLineFlags::boolAtPut(name, &value, origin);
597 }
599 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
600 double v;
601 if (sscanf(value, "%lf", &v) != 1) {
602 return false;
603 }
605 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
606 return true;
607 }
608 return false;
609 }
611 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
612 julong v;
613 intx intx_v;
614 bool is_neg = false;
615 // Check the sign first since atomull() parses only unsigned values.
616 if (*value == '-') {
617 if (!CommandLineFlags::intxAt(name, &intx_v)) {
618 return false;
619 }
620 value++;
621 is_neg = true;
622 }
623 if (!atomull(value, &v)) {
624 return false;
625 }
626 intx_v = (intx) v;
627 if (is_neg) {
628 intx_v = -intx_v;
629 }
630 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
631 return true;
632 }
633 uintx uintx_v = (uintx) v;
634 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
635 return true;
636 }
637 uint64_t uint64_t_v = (uint64_t) v;
638 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
639 return true;
640 }
641 return false;
642 }
644 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
645 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
646 // Contract: CommandLineFlags always returns a pointer that needs freeing.
647 FREE_C_HEAP_ARRAY(char, value, mtInternal);
648 return true;
649 }
651 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
652 const char* old_value = "";
653 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
654 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
655 size_t new_len = strlen(new_value);
656 const char* value;
657 char* free_this_too = NULL;
658 if (old_len == 0) {
659 value = new_value;
660 } else if (new_len == 0) {
661 value = old_value;
662 } else {
663 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
664 // each new setting adds another LINE to the switch:
665 sprintf(buf, "%s\n%s", old_value, new_value);
666 value = buf;
667 free_this_too = buf;
668 }
669 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
670 // CommandLineFlags always returns a pointer that needs freeing.
671 FREE_C_HEAP_ARRAY(char, value, mtInternal);
672 if (free_this_too != NULL) {
673 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
674 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
675 }
676 return true;
677 }
679 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
681 // range of acceptable characters spelled out for portability reasons
682 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
683 #define BUFLEN 255
684 char name[BUFLEN+1];
685 char dummy;
687 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
688 return set_bool_flag(name, false, origin);
689 }
690 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
691 return set_bool_flag(name, true, origin);
692 }
694 char punct;
695 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
696 const char* value = strchr(arg, '=') + 1;
697 Flag* flag = Flag::find_flag(name, strlen(name));
698 if (flag != NULL && flag->is_ccstr()) {
699 if (flag->ccstr_accumulates()) {
700 return append_to_string_flag(name, value, origin);
701 } else {
702 if (value[0] == '\0') {
703 value = NULL;
704 }
705 return set_string_flag(name, value, origin);
706 }
707 }
708 }
710 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
711 const char* value = strchr(arg, '=') + 1;
712 // -XX:Foo:=xxx will reset the string flag to the given value.
713 if (value[0] == '\0') {
714 value = NULL;
715 }
716 return set_string_flag(name, value, origin);
717 }
719 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
720 #define SIGNED_NUMBER_RANGE "[-0123456789]"
721 #define NUMBER_RANGE "[0123456789]"
722 char value[BUFLEN + 1];
723 char value2[BUFLEN + 1];
724 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
725 // Looks like a floating-point number -- try again with more lenient format string
726 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
727 return set_fp_numeric_flag(name, value, origin);
728 }
729 }
731 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
732 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
733 return set_numeric_flag(name, value, origin);
734 }
736 return false;
737 }
739 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
740 assert(bldarray != NULL, "illegal argument");
742 if (arg == NULL) {
743 return;
744 }
746 int index = *count;
748 // expand the array and add arg to the last element
749 (*count)++;
750 if (*bldarray == NULL) {
751 *bldarray = NEW_C_HEAP_ARRAY(char*, *count, mtInternal);
752 } else {
753 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count, mtInternal);
754 }
755 (*bldarray)[index] = strdup(arg);
756 }
758 void Arguments::build_jvm_args(const char* arg) {
759 add_string(&_jvm_args_array, &_num_jvm_args, arg);
760 }
762 void Arguments::build_jvm_flags(const char* arg) {
763 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
764 }
766 // utility function to return a string that concatenates all
767 // strings in a given char** array
768 const char* Arguments::build_resource_string(char** args, int count) {
769 if (args == NULL || count == 0) {
770 return NULL;
771 }
772 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
773 for (int i = 1; i < count; i++) {
774 length += strlen(args[i]) + 1; // add 1 for a space
775 }
776 char* s = NEW_RESOURCE_ARRAY(char, length);
777 strcpy(s, args[0]);
778 for (int j = 1; j < count; j++) {
779 strcat(s, " ");
780 strcat(s, args[j]);
781 }
782 return (const char*) s;
783 }
785 void Arguments::print_on(outputStream* st) {
786 st->print_cr("VM Arguments:");
787 if (num_jvm_flags() > 0) {
788 st->print("jvm_flags: "); print_jvm_flags_on(st);
789 }
790 if (num_jvm_args() > 0) {
791 st->print("jvm_args: "); print_jvm_args_on(st);
792 }
793 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
794 if (_java_class_path != NULL) {
795 char* path = _java_class_path->value();
796 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
797 }
798 st->print_cr("Launcher Type: %s", _sun_java_launcher);
799 }
801 void Arguments::print_jvm_flags_on(outputStream* st) {
802 if (_num_jvm_flags > 0) {
803 for (int i=0; i < _num_jvm_flags; i++) {
804 st->print("%s ", _jvm_flags_array[i]);
805 }
806 st->print_cr("");
807 }
808 }
810 void Arguments::print_jvm_args_on(outputStream* st) {
811 if (_num_jvm_args > 0) {
812 for (int i=0; i < _num_jvm_args; i++) {
813 st->print("%s ", _jvm_args_array[i]);
814 }
815 st->print_cr("");
816 }
817 }
819 bool Arguments::process_argument(const char* arg,
820 jboolean ignore_unrecognized, FlagValueOrigin origin) {
822 JDK_Version since = JDK_Version();
824 if (parse_argument(arg, origin) || ignore_unrecognized) {
825 return true;
826 }
828 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg;
829 if (is_newly_obsolete(arg, &since)) {
830 char version[256];
831 since.to_string(version, sizeof(version));
832 warning("ignoring option %s; support was removed in %s", argname, version);
833 return true;
834 }
836 // For locked flags, report a custom error message if available.
837 // Otherwise, report the standard unrecognized VM option.
839 Flag* locked_flag = Flag::find_flag((char*)argname, strlen(argname), true);
840 if (locked_flag != NULL) {
841 char locked_message_buf[BUFLEN];
842 locked_flag->get_locked_message(locked_message_buf, BUFLEN);
843 if (strlen(locked_message_buf) == 0) {
844 jio_fprintf(defaultStream::error_stream(),
845 "Unrecognized VM option '%s'\n", argname);
846 } else {
847 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
848 }
849 } else {
850 jio_fprintf(defaultStream::error_stream(),
851 "Unrecognized VM option '%s'\n", argname);
852 }
854 // allow for commandline "commenting out" options like -XX:#+Verbose
855 return arg[0] == '#';
856 }
858 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
859 FILE* stream = fopen(file_name, "rb");
860 if (stream == NULL) {
861 if (should_exist) {
862 jio_fprintf(defaultStream::error_stream(),
863 "Could not open settings file %s\n", file_name);
864 return false;
865 } else {
866 return true;
867 }
868 }
870 char token[1024];
871 int pos = 0;
873 bool in_white_space = true;
874 bool in_comment = false;
875 bool in_quote = false;
876 char quote_c = 0;
877 bool result = true;
879 int c = getc(stream);
880 while(c != EOF && pos < (int)(sizeof(token)-1)) {
881 if (in_white_space) {
882 if (in_comment) {
883 if (c == '\n') in_comment = false;
884 } else {
885 if (c == '#') in_comment = true;
886 else if (!isspace(c)) {
887 in_white_space = false;
888 token[pos++] = c;
889 }
890 }
891 } else {
892 if (c == '\n' || (!in_quote && isspace(c))) {
893 // token ends at newline, or at unquoted whitespace
894 // this allows a way to include spaces in string-valued options
895 token[pos] = '\0';
896 logOption(token);
897 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
898 build_jvm_flags(token);
899 pos = 0;
900 in_white_space = true;
901 in_quote = false;
902 } else if (!in_quote && (c == '\'' || c == '"')) {
903 in_quote = true;
904 quote_c = c;
905 } else if (in_quote && (c == quote_c)) {
906 in_quote = false;
907 } else {
908 token[pos++] = c;
909 }
910 }
911 c = getc(stream);
912 }
913 if (pos > 0) {
914 token[pos] = '\0';
915 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
916 build_jvm_flags(token);
917 }
918 fclose(stream);
919 return result;
920 }
922 //=============================================================================================================
923 // Parsing of properties (-D)
925 const char* Arguments::get_property(const char* key) {
926 return PropertyList_get_value(system_properties(), key);
927 }
929 bool Arguments::add_property(const char* prop) {
930 const char* eq = strchr(prop, '=');
931 char* key;
932 // ns must be static--its address may be stored in a SystemProperty object.
933 const static char ns[1] = {0};
934 char* value = (char *)ns;
936 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
937 key = AllocateHeap(key_len + 1, mtInternal);
938 strncpy(key, prop, key_len);
939 key[key_len] = '\0';
941 if (eq != NULL) {
942 size_t value_len = strlen(prop) - key_len - 1;
943 value = AllocateHeap(value_len + 1, mtInternal);
944 strncpy(value, &prop[key_len + 1], value_len + 1);
945 }
947 if (strcmp(key, "java.compiler") == 0) {
948 process_java_compiler_argument(value);
949 FreeHeap(key);
950 if (eq != NULL) {
951 FreeHeap(value);
952 }
953 return true;
954 } else if (strcmp(key, "sun.java.command") == 0) {
955 _java_command = value;
957 // Record value in Arguments, but let it get passed to Java.
958 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
959 // launcher.pid property is private and is processed
960 // in process_sun_java_launcher_properties();
961 // the sun.java.launcher property is passed on to the java application
962 FreeHeap(key);
963 if (eq != NULL) {
964 FreeHeap(value);
965 }
966 return true;
967 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
968 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
969 // its value without going through the property list or making a Java call.
970 _java_vendor_url_bug = value;
971 } else if (strcmp(key, "sun.boot.library.path") == 0) {
972 PropertyList_unique_add(&_system_properties, key, value, true);
973 return true;
974 }
975 // Create new property and add at the end of the list
976 PropertyList_unique_add(&_system_properties, key, value);
977 return true;
978 }
980 //===========================================================================================================
981 // Setting int/mixed/comp mode flags
983 void Arguments::set_mode_flags(Mode mode) {
984 // Set up default values for all flags.
985 // If you add a flag to any of the branches below,
986 // add a default value for it here.
987 set_java_compiler(false);
988 _mode = mode;
990 // Ensure Agent_OnLoad has the correct initial values.
991 // This may not be the final mode; mode may change later in onload phase.
992 PropertyList_unique_add(&_system_properties, "java.vm.info",
993 (char*)VM_Version::vm_info_string(), false);
995 UseInterpreter = true;
996 UseCompiler = true;
997 UseLoopCounter = true;
999 #ifndef ZERO
1000 // Turn these off for mixed and comp. Leave them on for Zero.
1001 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1002 UseFastAccessorMethods = (mode == _int);
1003 }
1004 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1005 UseFastEmptyMethods = (mode == _int);
1006 }
1007 #endif
1009 // Default values may be platform/compiler dependent -
1010 // use the saved values
1011 ClipInlining = Arguments::_ClipInlining;
1012 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1013 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1014 BackgroundCompilation = Arguments::_BackgroundCompilation;
1016 // Change from defaults based on mode
1017 switch (mode) {
1018 default:
1019 ShouldNotReachHere();
1020 break;
1021 case _int:
1022 UseCompiler = false;
1023 UseLoopCounter = false;
1024 AlwaysCompileLoopMethods = false;
1025 UseOnStackReplacement = false;
1026 break;
1027 case _mixed:
1028 // same as default
1029 break;
1030 case _comp:
1031 UseInterpreter = false;
1032 BackgroundCompilation = false;
1033 ClipInlining = false;
1034 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1035 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1036 // compile a level 4 (C2) and then continue executing it.
1037 if (TieredCompilation) {
1038 Tier3InvokeNotifyFreqLog = 0;
1039 Tier4InvocationThreshold = 0;
1040 }
1041 break;
1042 }
1043 }
1045 // Conflict: required to use shared spaces (-Xshare:on), but
1046 // incompatible command line options were chosen.
1048 static void no_shared_spaces() {
1049 if (RequireSharedSpaces) {
1050 jio_fprintf(defaultStream::error_stream(),
1051 "Class data sharing is inconsistent with other specified options.\n");
1052 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1053 } else {
1054 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1055 }
1056 }
1058 void Arguments::set_tiered_flags() {
1059 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1060 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1061 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1062 }
1063 if (CompilationPolicyChoice < 2) {
1064 vm_exit_during_initialization(
1065 "Incompatible compilation policy selected", NULL);
1066 }
1067 // Increase the code cache size - tiered compiles a lot more.
1068 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1069 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1070 }
1071 }
1073 #if INCLUDE_ALTERNATE_GCS
1074 static void disable_adaptive_size_policy(const char* collector_name) {
1075 if (UseAdaptiveSizePolicy) {
1076 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1077 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1078 collector_name);
1079 }
1080 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1081 }
1082 }
1084 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1085 // if it's not explictly set or unset. If the user has chosen
1086 // UseParNewGC and not explicitly set ParallelGCThreads we
1087 // set it, unless this is a single cpu machine.
1088 void Arguments::set_parnew_gc_flags() {
1089 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1090 "control point invariant");
1091 assert(UseParNewGC, "Error");
1093 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1094 disable_adaptive_size_policy("UseParNewGC");
1096 if (ParallelGCThreads == 0) {
1097 FLAG_SET_DEFAULT(ParallelGCThreads,
1098 Abstract_VM_Version::parallel_worker_threads());
1099 if (ParallelGCThreads == 1) {
1100 FLAG_SET_DEFAULT(UseParNewGC, false);
1101 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1102 }
1103 }
1104 if (UseParNewGC) {
1105 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1106 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1107 // we set them to 1024 and 1024.
1108 // See CR 6362902.
1109 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1110 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1111 }
1112 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1113 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1114 }
1116 // AlwaysTenure flag should make ParNew promote all at first collection.
1117 // See CR 6362902.
1118 if (AlwaysTenure) {
1119 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1120 }
1121 // When using compressed oops, we use local overflow stacks,
1122 // rather than using a global overflow list chained through
1123 // the klass word of the object's pre-image.
1124 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1125 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1126 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1127 }
1128 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1129 }
1130 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1131 }
1132 }
1134 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1135 // sparc/solaris for certain applications, but would gain from
1136 // further optimization and tuning efforts, and would almost
1137 // certainly gain from analysis of platform and environment.
1138 void Arguments::set_cms_and_parnew_gc_flags() {
1139 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1140 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1142 // If we are using CMS, we prefer to UseParNewGC,
1143 // unless explicitly forbidden.
1144 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1145 FLAG_SET_ERGO(bool, UseParNewGC, true);
1146 }
1148 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1149 disable_adaptive_size_policy("UseConcMarkSweepGC");
1151 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1152 // as needed.
1153 if (UseParNewGC) {
1154 set_parnew_gc_flags();
1155 }
1157 // MaxHeapSize is aligned down in collectorPolicy
1158 size_t max_heap = align_size_down(MaxHeapSize,
1159 CardTableRS::ct_max_alignment_constraint());
1161 // Now make adjustments for CMS
1162 intx tenuring_default = (intx)6;
1163 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1165 // Preferred young gen size for "short" pauses:
1166 // upper bound depends on # of threads and NewRatio.
1167 const uintx parallel_gc_threads =
1168 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1169 const size_t preferred_max_new_size_unaligned =
1170 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1171 size_t preferred_max_new_size =
1172 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1174 // Unless explicitly requested otherwise, size young gen
1175 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1177 // If either MaxNewSize or NewRatio is set on the command line,
1178 // assume the user is trying to set the size of the young gen.
1179 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1181 // Set MaxNewSize to our calculated preferred_max_new_size unless
1182 // NewSize was set on the command line and it is larger than
1183 // preferred_max_new_size.
1184 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1185 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1186 } else {
1187 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1188 }
1189 if (PrintGCDetails && Verbose) {
1190 // Too early to use gclog_or_tty
1191 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1192 }
1194 // Code along this path potentially sets NewSize and OldSize
1196 assert(max_heap >= InitialHeapSize, "Error");
1197 assert(max_heap >= NewSize, "Error");
1199 if (PrintGCDetails && Verbose) {
1200 // Too early to use gclog_or_tty
1201 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1202 " initial_heap_size: " SIZE_FORMAT
1203 " max_heap: " SIZE_FORMAT,
1204 min_heap_size(), InitialHeapSize, max_heap);
1205 }
1206 size_t min_new = preferred_max_new_size;
1207 if (FLAG_IS_CMDLINE(NewSize)) {
1208 min_new = NewSize;
1209 }
1210 if (max_heap > min_new && min_heap_size() > min_new) {
1211 // Unless explicitly requested otherwise, make young gen
1212 // at least min_new, and at most preferred_max_new_size.
1213 if (FLAG_IS_DEFAULT(NewSize)) {
1214 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1215 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1216 if (PrintGCDetails && Verbose) {
1217 // Too early to use gclog_or_tty
1218 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1219 }
1220 }
1221 // Unless explicitly requested otherwise, size old gen
1222 // so it's NewRatio x of NewSize.
1223 if (FLAG_IS_DEFAULT(OldSize)) {
1224 if (max_heap > NewSize) {
1225 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1226 if (PrintGCDetails && Verbose) {
1227 // Too early to use gclog_or_tty
1228 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1229 }
1230 }
1231 }
1232 }
1233 }
1234 // Unless explicitly requested otherwise, definitely
1235 // promote all objects surviving "tenuring_default" scavenges.
1236 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1237 FLAG_IS_DEFAULT(SurvivorRatio)) {
1238 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1239 }
1240 // If we decided above (or user explicitly requested)
1241 // `promote all' (via MaxTenuringThreshold := 0),
1242 // prefer minuscule survivor spaces so as not to waste
1243 // space for (non-existent) survivors
1244 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1245 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1246 }
1247 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1248 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1249 // This is done in order to make ParNew+CMS configuration to work
1250 // with YoungPLABSize and OldPLABSize options.
1251 // See CR 6362902.
1252 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1253 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1254 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1255 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1256 // the value (either from the command line or ergonomics) of
1257 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1258 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1259 } else {
1260 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1261 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1262 // we'll let it to take precedence.
1263 jio_fprintf(defaultStream::error_stream(),
1264 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1265 " options are specified for the CMS collector."
1266 " CMSParPromoteBlocksToClaim will take precedence.\n");
1267 }
1268 }
1269 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1270 // OldPLAB sizing manually turned off: Use a larger default setting,
1271 // unless it was manually specified. This is because a too-low value
1272 // will slow down scavenges.
1273 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1274 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1275 }
1276 }
1277 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1278 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1279 // If either of the static initialization defaults have changed, note this
1280 // modification.
1281 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1282 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1283 }
1284 if (PrintGCDetails && Verbose) {
1285 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1286 MarkStackSize / K, MarkStackSizeMax / K);
1287 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1288 }
1289 }
1290 #endif // INCLUDE_ALTERNATE_GCS
1292 void set_object_alignment() {
1293 // Object alignment.
1294 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1295 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1296 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1297 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1298 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1299 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1301 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1302 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1304 // Oop encoding heap max
1305 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1307 #if INCLUDE_ALTERNATE_GCS
1308 // Set CMS global values
1309 CompactibleFreeListSpace::set_cms_values();
1310 #endif // INCLUDE_ALTERNATE_GCS
1311 }
1313 bool verify_object_alignment() {
1314 // Object alignment.
1315 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1316 jio_fprintf(defaultStream::error_stream(),
1317 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1318 (int)ObjectAlignmentInBytes);
1319 return false;
1320 }
1321 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1322 jio_fprintf(defaultStream::error_stream(),
1323 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1324 (int)ObjectAlignmentInBytes, BytesPerLong);
1325 return false;
1326 }
1327 // It does not make sense to have big object alignment
1328 // since a space lost due to alignment will be greater
1329 // then a saved space from compressed oops.
1330 if ((int)ObjectAlignmentInBytes > 256) {
1331 jio_fprintf(defaultStream::error_stream(),
1332 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1333 (int)ObjectAlignmentInBytes);
1334 return false;
1335 }
1336 // In case page size is very small.
1337 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1338 jio_fprintf(defaultStream::error_stream(),
1339 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1340 (int)ObjectAlignmentInBytes, os::vm_page_size());
1341 return false;
1342 }
1343 return true;
1344 }
1346 inline uintx max_heap_for_compressed_oops() {
1347 // Avoid sign flip.
1348 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) {
1349 return 0;
1350 }
1351 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size());
1352 NOT_LP64(ShouldNotReachHere(); return 0);
1353 }
1355 bool Arguments::should_auto_select_low_pause_collector() {
1356 if (UseAutoGCSelectPolicy &&
1357 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1358 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1359 if (PrintGCDetails) {
1360 // Cannot use gclog_or_tty yet.
1361 tty->print_cr("Automatic selection of the low pause collector"
1362 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1363 }
1364 return true;
1365 }
1366 return false;
1367 }
1369 void Arguments::set_ergonomics_flags() {
1371 if (os::is_server_class_machine()) {
1372 // If no other collector is requested explicitly,
1373 // let the VM select the collector based on
1374 // machine class and automatic selection policy.
1375 if (!UseSerialGC &&
1376 !UseConcMarkSweepGC &&
1377 !UseG1GC &&
1378 !UseParNewGC &&
1379 FLAG_IS_DEFAULT(UseParallelGC)) {
1380 if (should_auto_select_low_pause_collector()) {
1381 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1382 } else {
1383 FLAG_SET_ERGO(bool, UseParallelGC, true);
1384 }
1385 }
1386 // Shared spaces work fine with other GCs but causes bytecode rewriting
1387 // to be disabled, which hurts interpreter performance and decreases
1388 // server performance. On server class machines, keep the default
1389 // off unless it is asked for. Future work: either add bytecode rewriting
1390 // at link time, or rewrite bytecodes in non-shared methods.
1391 if (!DumpSharedSpaces && !RequireSharedSpaces) {
1392 no_shared_spaces();
1393 }
1394 }
1396 #ifndef ZERO
1397 #ifdef _LP64
1398 // Check that UseCompressedOops can be set with the max heap size allocated
1399 // by ergonomics.
1400 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1401 #if !defined(COMPILER1) || defined(TIERED)
1402 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1403 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1404 }
1405 #endif
1406 #ifdef _WIN64
1407 if (UseLargePages && UseCompressedOops) {
1408 // Cannot allocate guard pages for implicit checks in indexed addressing
1409 // mode, when large pages are specified on windows.
1410 // This flag could be switched ON if narrow oop base address is set to 0,
1411 // see code in Universe::initialize_heap().
1412 Universe::set_narrow_oop_use_implicit_null_checks(false);
1413 }
1414 #endif // _WIN64
1415 } else {
1416 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1417 warning("Max heap size too large for Compressed Oops");
1418 FLAG_SET_DEFAULT(UseCompressedOops, false);
1419 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1420 }
1421 }
1422 // UseCompressedOops must be on for UseCompressedKlassPointers to be on.
1423 if (!UseCompressedOops) {
1424 if (UseCompressedKlassPointers) {
1425 warning("UseCompressedKlassPointers requires UseCompressedOops");
1426 }
1427 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1428 } else {
1429 // Turn on UseCompressedKlassPointers too
1430 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) {
1431 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true);
1432 }
1433 // Set the ClassMetaspaceSize to something that will not need to be
1434 // expanded, since it cannot be expanded.
1435 if (UseCompressedKlassPointers && FLAG_IS_DEFAULT(ClassMetaspaceSize)) {
1436 // 100,000 classes seems like a good size, so 100M assumes around 1K
1437 // per klass. The vtable and oopMap is embedded so we don't have a fixed
1438 // size per klass. Eventually, this will be parameterized because it
1439 // would also be useful to determine the optimal size of the
1440 // systemDictionary.
1441 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M);
1442 }
1443 }
1444 // Also checks that certain machines are slower with compressed oops
1445 // in vm_version initialization code.
1446 #endif // _LP64
1447 #endif // !ZERO
1448 }
1450 void Arguments::set_parallel_gc_flags() {
1451 assert(UseParallelGC || UseParallelOldGC, "Error");
1452 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1453 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1454 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1455 }
1456 FLAG_SET_DEFAULT(UseParallelGC, true);
1458 // If no heap maximum was requested explicitly, use some reasonable fraction
1459 // of the physical memory, up to a maximum of 1GB.
1460 if (UseParallelGC) {
1461 FLAG_SET_DEFAULT(ParallelGCThreads,
1462 Abstract_VM_Version::parallel_worker_threads());
1464 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1465 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1466 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1467 // See CR 6362902 for details.
1468 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1469 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1470 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1471 }
1472 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1473 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1474 }
1475 }
1477 if (UseParallelOldGC) {
1478 // Par compact uses lower default values since they are treated as
1479 // minimums. These are different defaults because of the different
1480 // interpretation and are not ergonomically set.
1481 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1482 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1483 }
1484 }
1485 }
1486 if (UseNUMA) {
1487 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
1488 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
1489 }
1490 // For those collectors or operating systems (eg, Windows) that do
1491 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
1492 UseNUMAInterleaving = true;
1493 }
1494 }
1496 void Arguments::set_g1_gc_flags() {
1497 assert(UseG1GC, "Error");
1498 #ifdef COMPILER1
1499 FastTLABRefill = false;
1500 #endif
1501 FLAG_SET_DEFAULT(ParallelGCThreads,
1502 Abstract_VM_Version::parallel_worker_threads());
1503 if (ParallelGCThreads == 0) {
1504 FLAG_SET_DEFAULT(ParallelGCThreads,
1505 Abstract_VM_Version::parallel_worker_threads());
1506 }
1508 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1509 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1510 }
1511 if (PrintGCDetails && Verbose) {
1512 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1513 MarkStackSize / K, MarkStackSizeMax / K);
1514 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1515 }
1517 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1518 // In G1, we want the default GC overhead goal to be higher than
1519 // say in PS. So we set it here to 10%. Otherwise the heap might
1520 // be expanded more aggressively than we would like it to. In
1521 // fact, even 10% seems to not be high enough in some cases
1522 // (especially small GC stress tests that the main thing they do
1523 // is allocation). We might consider increase it further.
1524 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1525 }
1526 }
1528 void Arguments::set_heap_size() {
1529 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1530 // Deprecated flag
1531 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1532 }
1534 const julong phys_mem =
1535 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1536 : (julong)MaxRAM;
1538 // If the maximum heap size has not been set with -Xmx,
1539 // then set it as fraction of the size of physical memory,
1540 // respecting the maximum and minimum sizes of the heap.
1541 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1542 julong reasonable_max = phys_mem / MaxRAMFraction;
1544 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1545 // Small physical memory, so use a minimum fraction of it for the heap
1546 reasonable_max = phys_mem / MinRAMFraction;
1547 } else {
1548 // Not-small physical memory, so require a heap at least
1549 // as large as MaxHeapSize
1550 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1551 }
1552 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1553 // Limit the heap size to ErgoHeapSizeLimit
1554 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1555 }
1556 if (UseCompressedOops) {
1557 // Limit the heap size to the maximum possible when using compressed oops
1558 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1559 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1560 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1561 // but it should be not less than default MaxHeapSize.
1562 max_coop_heap -= HeapBaseMinAddress;
1563 }
1564 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1565 }
1566 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1568 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1569 // An initial heap size was specified on the command line,
1570 // so be sure that the maximum size is consistent. Done
1571 // after call to allocatable_physical_memory because that
1572 // method might reduce the allocation size.
1573 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1574 }
1576 if (PrintGCDetails && Verbose) {
1577 // Cannot use gclog_or_tty yet.
1578 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1579 }
1580 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1581 }
1583 // If the initial_heap_size has not been set with InitialHeapSize
1584 // or -Xms, then set it as fraction of the size of physical memory,
1585 // respecting the maximum and minimum sizes of the heap.
1586 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1587 julong reasonable_minimum = (julong)(OldSize + NewSize);
1589 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1591 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1593 julong reasonable_initial = phys_mem / InitialRAMFraction;
1595 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1596 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1598 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1600 if (PrintGCDetails && Verbose) {
1601 // Cannot use gclog_or_tty yet.
1602 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1603 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1604 }
1605 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1606 set_min_heap_size((uintx)reasonable_minimum);
1607 }
1608 }
1610 // This must be called after ergonomics because we want bytecode rewriting
1611 // if the server compiler is used, or if UseSharedSpaces is disabled.
1612 void Arguments::set_bytecode_flags() {
1613 // Better not attempt to store into a read-only space.
1614 if (UseSharedSpaces) {
1615 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1616 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1617 }
1619 if (!RewriteBytecodes) {
1620 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1621 }
1622 }
1624 // Aggressive optimization flags -XX:+AggressiveOpts
1625 void Arguments::set_aggressive_opts_flags() {
1626 #ifdef COMPILER2
1627 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1628 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1629 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1630 }
1631 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1632 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1633 }
1635 // Feed the cache size setting into the JDK
1636 char buffer[1024];
1637 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1638 add_property(buffer);
1639 }
1640 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1641 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1642 }
1643 #endif
1645 if (AggressiveOpts) {
1646 // Sample flag setting code
1647 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1648 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1649 // }
1650 }
1651 }
1653 //===========================================================================================================
1654 // Parsing of java.compiler property
1656 void Arguments::process_java_compiler_argument(char* arg) {
1657 // For backwards compatibility, Djava.compiler=NONE or ""
1658 // causes us to switch to -Xint mode UNLESS -Xdebug
1659 // is also specified.
1660 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1661 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1662 }
1663 }
1665 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1666 _sun_java_launcher = strdup(launcher);
1667 if (strcmp("gamma", _sun_java_launcher) == 0) {
1668 _created_by_gamma_launcher = true;
1669 }
1670 }
1672 bool Arguments::created_by_java_launcher() {
1673 assert(_sun_java_launcher != NULL, "property must have value");
1674 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1675 }
1677 bool Arguments::created_by_gamma_launcher() {
1678 return _created_by_gamma_launcher;
1679 }
1681 //===========================================================================================================
1682 // Parsing of main arguments
1684 bool Arguments::verify_interval(uintx val, uintx min,
1685 uintx max, const char* name) {
1686 // Returns true iff value is in the inclusive interval [min..max]
1687 // false, otherwise.
1688 if (val >= min && val <= max) {
1689 return true;
1690 }
1691 jio_fprintf(defaultStream::error_stream(),
1692 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1693 " and " UINTX_FORMAT "\n",
1694 name, val, min, max);
1695 return false;
1696 }
1698 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1699 // Returns true if given value is at least specified min threshold
1700 // false, otherwise.
1701 if (val >= min ) {
1702 return true;
1703 }
1704 jio_fprintf(defaultStream::error_stream(),
1705 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1706 name, val, min);
1707 return false;
1708 }
1710 bool Arguments::verify_percentage(uintx value, const char* name) {
1711 if (value <= 100) {
1712 return true;
1713 }
1714 jio_fprintf(defaultStream::error_stream(),
1715 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1716 name, value);
1717 return false;
1718 }
1720 static void force_serial_gc() {
1721 FLAG_SET_DEFAULT(UseSerialGC, true);
1722 FLAG_SET_DEFAULT(UseParNewGC, false);
1723 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1724 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1725 FLAG_SET_DEFAULT(UseParallelGC, false);
1726 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1727 FLAG_SET_DEFAULT(UseG1GC, false);
1728 }
1730 static bool verify_serial_gc_flags() {
1731 return (UseSerialGC &&
1732 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1733 UseParallelGC || UseParallelOldGC));
1734 }
1736 // check if do gclog rotation
1737 // +UseGCLogFileRotation is a must,
1738 // no gc log rotation when log file not supplied or
1739 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1740 void check_gclog_consistency() {
1741 if (UseGCLogFileRotation) {
1742 if ((Arguments::gc_log_filename() == NULL) ||
1743 (NumberOfGCLogFiles == 0) ||
1744 (GCLogFileSize == 0)) {
1745 jio_fprintf(defaultStream::output_stream(),
1746 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1747 "where num_of_file > 0 and num_of_size > 0\n"
1748 "GC log rotation is turned off\n");
1749 UseGCLogFileRotation = false;
1750 }
1751 }
1753 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1754 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1755 jio_fprintf(defaultStream::output_stream(),
1756 "GCLogFileSize changed to minimum 8K\n");
1757 }
1758 }
1760 // Check consistency of GC selection
1761 bool Arguments::check_gc_consistency() {
1762 check_gclog_consistency();
1763 bool status = true;
1764 // Ensure that the user has not selected conflicting sets
1765 // of collectors. [Note: this check is merely a user convenience;
1766 // collectors over-ride each other so that only a non-conflicting
1767 // set is selected; however what the user gets is not what they
1768 // may have expected from the combination they asked for. It's
1769 // better to reduce user confusion by not allowing them to
1770 // select conflicting combinations.
1771 uint i = 0;
1772 if (UseSerialGC) i++;
1773 if (UseConcMarkSweepGC || UseParNewGC) i++;
1774 if (UseParallelGC || UseParallelOldGC) i++;
1775 if (UseG1GC) i++;
1776 if (i > 1) {
1777 jio_fprintf(defaultStream::error_stream(),
1778 "Conflicting collector combinations in option list; "
1779 "please refer to the release notes for the combinations "
1780 "allowed\n");
1781 status = false;
1782 }
1784 return status;
1785 }
1787 // Check stack pages settings
1788 bool Arguments::check_stack_pages()
1789 {
1790 bool status = true;
1791 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1792 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1793 // greater stack shadow pages can't generate instruction to bang stack
1794 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1795 return status;
1796 }
1798 // Check the consistency of vm_init_args
1799 bool Arguments::check_vm_args_consistency() {
1800 // Method for adding checks for flag consistency.
1801 // The intent is to warn the user of all possible conflicts,
1802 // before returning an error.
1803 // Note: Needs platform-dependent factoring.
1804 bool status = true;
1806 #if ( (defined(COMPILER2) && defined(SPARC)))
1807 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1808 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1809 // x86. Normally, VM_Version_init must be called from init_globals in
1810 // init.cpp, which is called by the initial java thread *after* arguments
1811 // have been parsed. VM_Version_init gets called twice on sparc.
1812 extern void VM_Version_init();
1813 VM_Version_init();
1814 if (!VM_Version::has_v9()) {
1815 jio_fprintf(defaultStream::error_stream(),
1816 "V8 Machine detected, Server requires V9\n");
1817 status = false;
1818 }
1819 #endif /* COMPILER2 && SPARC */
1821 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1822 // builds so the cost of stack banging can be measured.
1823 #if (defined(PRODUCT) && defined(SOLARIS))
1824 if (!UseBoundThreads && !UseStackBanging) {
1825 jio_fprintf(defaultStream::error_stream(),
1826 "-UseStackBanging conflicts with -UseBoundThreads\n");
1828 status = false;
1829 }
1830 #endif
1832 if (TLABRefillWasteFraction == 0) {
1833 jio_fprintf(defaultStream::error_stream(),
1834 "TLABRefillWasteFraction should be a denominator, "
1835 "not " SIZE_FORMAT "\n",
1836 TLABRefillWasteFraction);
1837 status = false;
1838 }
1840 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1841 "AdaptiveSizePolicyWeight");
1842 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1843 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1844 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1846 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1847 jio_fprintf(defaultStream::error_stream(),
1848 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1849 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1850 MinHeapFreeRatio, MaxHeapFreeRatio);
1851 status = false;
1852 }
1853 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1854 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1856 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1857 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1858 }
1860 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1861 // Settings to encourage splitting.
1862 if (!FLAG_IS_CMDLINE(NewRatio)) {
1863 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1864 }
1865 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1866 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1867 }
1868 }
1870 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1871 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1872 if (GCTimeLimit == 100) {
1873 // Turn off gc-overhead-limit-exceeded checks
1874 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1875 }
1877 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1879 status = status && check_gc_consistency();
1880 status = status && check_stack_pages();
1882 if (_has_alloc_profile) {
1883 if (UseParallelGC || UseParallelOldGC) {
1884 jio_fprintf(defaultStream::error_stream(),
1885 "error: invalid argument combination.\n"
1886 "Allocation profiling (-Xaprof) cannot be used together with "
1887 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1888 status = false;
1889 }
1890 if (UseConcMarkSweepGC) {
1891 jio_fprintf(defaultStream::error_stream(),
1892 "error: invalid argument combination.\n"
1893 "Allocation profiling (-Xaprof) cannot be used together with "
1894 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1895 status = false;
1896 }
1897 }
1899 if (CMSIncrementalMode) {
1900 if (!UseConcMarkSweepGC) {
1901 jio_fprintf(defaultStream::error_stream(),
1902 "error: invalid argument combination.\n"
1903 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1904 "selected in order\nto use CMSIncrementalMode.\n");
1905 status = false;
1906 } else {
1907 status = status && verify_percentage(CMSIncrementalDutyCycle,
1908 "CMSIncrementalDutyCycle");
1909 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1910 "CMSIncrementalDutyCycleMin");
1911 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1912 "CMSIncrementalSafetyFactor");
1913 status = status && verify_percentage(CMSIncrementalOffset,
1914 "CMSIncrementalOffset");
1915 status = status && verify_percentage(CMSExpAvgFactor,
1916 "CMSExpAvgFactor");
1917 // If it was not set on the command line, set
1918 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1919 if (CMSInitiatingOccupancyFraction < 0) {
1920 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1921 }
1922 }
1923 }
1925 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1926 // insists that we hold the requisite locks so that the iteration is
1927 // MT-safe. For the verification at start-up and shut-down, we don't
1928 // yet have a good way of acquiring and releasing these locks,
1929 // which are not visible at the CollectedHeap level. We want to
1930 // be able to acquire these locks and then do the iteration rather
1931 // than just disable the lock verification. This will be fixed under
1932 // bug 4788986.
1933 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1934 if (VerifyGCStartAt == 0) {
1935 warning("Heap verification at start-up disabled "
1936 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1937 VerifyGCStartAt = 1; // Disable verification at start-up
1938 }
1939 if (VerifyBeforeExit) {
1940 warning("Heap verification at shutdown disabled "
1941 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1942 VerifyBeforeExit = false; // Disable verification at shutdown
1943 }
1944 }
1946 // Note: only executed in non-PRODUCT mode
1947 if (!UseAsyncConcMarkSweepGC &&
1948 (ExplicitGCInvokesConcurrent ||
1949 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1950 jio_fprintf(defaultStream::error_stream(),
1951 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1952 " with -UseAsyncConcMarkSweepGC");
1953 status = false;
1954 }
1956 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
1958 #ifndef SERIALGC
1959 if (UseG1GC) {
1960 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1961 "InitiatingHeapOccupancyPercent");
1962 status = status && verify_min_value(G1RefProcDrainInterval, 1,
1963 "G1RefProcDrainInterval");
1964 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
1965 "G1ConcMarkStepDurationMillis");
1966 }
1967 #endif
1969 status = status && verify_interval(RefDiscoveryPolicy,
1970 ReferenceProcessor::DiscoveryPolicyMin,
1971 ReferenceProcessor::DiscoveryPolicyMax,
1972 "RefDiscoveryPolicy");
1974 // Limit the lower bound of this flag to 1 as it is used in a division
1975 // expression.
1976 status = status && verify_interval(TLABWasteTargetPercent,
1977 1, 100, "TLABWasteTargetPercent");
1979 status = status && verify_object_alignment();
1981 status = status && verify_min_value(ClassMetaspaceSize, 1*M,
1982 "ClassMetaspaceSize");
1984 #ifdef SPARC
1985 if (UseConcMarkSweepGC || UseG1GC) {
1986 // Issue a stern warning if the user has explicitly set
1987 // UseMemSetInBOT (it is known to cause issues), but allow
1988 // use for experimentation and debugging.
1989 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
1990 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
1991 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
1992 " on sun4v; please understand that you are using at your own risk!");
1993 }
1994 }
1995 #endif // SPARC
1997 if (PrintNMTStatistics) {
1998 #if INCLUDE_NMT
1999 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2000 #endif // INCLUDE_NMT
2001 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2002 PrintNMTStatistics = false;
2003 #if INCLUDE_NMT
2004 }
2005 #endif
2006 }
2008 return status;
2009 }
2011 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2012 const char* option_type) {
2013 if (ignore) return false;
2015 const char* spacer = " ";
2016 if (option_type == NULL) {
2017 option_type = ++spacer; // Set both to the empty string.
2018 }
2020 if (os::obsolete_option(option)) {
2021 jio_fprintf(defaultStream::error_stream(),
2022 "Obsolete %s%soption: %s\n", option_type, spacer,
2023 option->optionString);
2024 return false;
2025 } else {
2026 jio_fprintf(defaultStream::error_stream(),
2027 "Unrecognized %s%soption: %s\n", option_type, spacer,
2028 option->optionString);
2029 return true;
2030 }
2031 }
2033 static const char* user_assertion_options[] = {
2034 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2035 };
2037 static const char* system_assertion_options[] = {
2038 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2039 };
2041 // Return true if any of the strings in null-terminated array 'names' matches.
2042 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2043 // the option must match exactly.
2044 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2045 bool tail_allowed) {
2046 for (/* empty */; *names != NULL; ++names) {
2047 if (match_option(option, *names, tail)) {
2048 if (**tail == '\0' || tail_allowed && **tail == ':') {
2049 return true;
2050 }
2051 }
2052 }
2053 return false;
2054 }
2056 bool Arguments::parse_uintx(const char* value,
2057 uintx* uintx_arg,
2058 uintx min_size) {
2060 // Check the sign first since atomull() parses only unsigned values.
2061 bool value_is_positive = !(*value == '-');
2063 if (value_is_positive) {
2064 julong n;
2065 bool good_return = atomull(value, &n);
2066 if (good_return) {
2067 bool above_minimum = n >= min_size;
2068 bool value_is_too_large = n > max_uintx;
2070 if (above_minimum && !value_is_too_large) {
2071 *uintx_arg = n;
2072 return true;
2073 }
2074 }
2075 }
2076 return false;
2077 }
2079 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2080 julong* long_arg,
2081 julong min_size) {
2082 if (!atomull(s, long_arg)) return arg_unreadable;
2083 return check_memory_size(*long_arg, min_size);
2084 }
2086 // Parse JavaVMInitArgs structure
2088 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2089 // For components of the system classpath.
2090 SysClassPath scp(Arguments::get_sysclasspath());
2091 bool scp_assembly_required = false;
2093 // Save default settings for some mode flags
2094 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2095 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2096 Arguments::_ClipInlining = ClipInlining;
2097 Arguments::_BackgroundCompilation = BackgroundCompilation;
2099 // Setup flags for mixed which is the default
2100 set_mode_flags(_mixed);
2102 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2103 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2104 if (result != JNI_OK) {
2105 return result;
2106 }
2108 // Parse JavaVMInitArgs structure passed in
2109 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2110 if (result != JNI_OK) {
2111 return result;
2112 }
2114 if (AggressiveOpts) {
2115 // Insert alt-rt.jar between user-specified bootclasspath
2116 // prefix and the default bootclasspath. os::set_boot_path()
2117 // uses meta_index_dir as the default bootclasspath directory.
2118 const char* altclasses_jar = "alt-rt.jar";
2119 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2120 strlen(altclasses_jar);
2121 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2122 strcpy(altclasses_path, get_meta_index_dir());
2123 strcat(altclasses_path, altclasses_jar);
2124 scp.add_suffix_to_prefix(altclasses_path);
2125 scp_assembly_required = true;
2126 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2127 }
2129 if (WhiteBoxAPI) {
2130 // Append wb.jar to bootclasspath if enabled
2131 const char* wb_jar = "wb.jar";
2132 size_t wb_path_len = strlen(get_meta_index_dir()) + 1 +
2133 strlen(wb_jar);
2134 char* wb_path = NEW_C_HEAP_ARRAY(char, wb_path_len, mtInternal);
2135 strcpy(wb_path, get_meta_index_dir());
2136 strcat(wb_path, wb_jar);
2137 scp.add_suffix(wb_path);
2138 scp_assembly_required = true;
2139 FREE_C_HEAP_ARRAY(char, wb_path, mtInternal);
2140 }
2142 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2143 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2144 if (result != JNI_OK) {
2145 return result;
2146 }
2148 // Do final processing now that all arguments have been parsed
2149 result = finalize_vm_init_args(&scp, scp_assembly_required);
2150 if (result != JNI_OK) {
2151 return result;
2152 }
2154 return JNI_OK;
2155 }
2157 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2158 SysClassPath* scp_p,
2159 bool* scp_assembly_required_p,
2160 FlagValueOrigin origin) {
2161 // Remaining part of option string
2162 const char* tail;
2164 // iterate over arguments
2165 for (int index = 0; index < args->nOptions; index++) {
2166 bool is_absolute_path = false; // for -agentpath vs -agentlib
2168 const JavaVMOption* option = args->options + index;
2170 if (!match_option(option, "-Djava.class.path", &tail) &&
2171 !match_option(option, "-Dsun.java.command", &tail) &&
2172 !match_option(option, "-Dsun.java.launcher", &tail)) {
2174 // add all jvm options to the jvm_args string. This string
2175 // is used later to set the java.vm.args PerfData string constant.
2176 // the -Djava.class.path and the -Dsun.java.command options are
2177 // omitted from jvm_args string as each have their own PerfData
2178 // string constant object.
2179 build_jvm_args(option->optionString);
2180 }
2182 // -verbose:[class/gc/jni]
2183 if (match_option(option, "-verbose", &tail)) {
2184 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2185 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2186 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2187 } else if (!strcmp(tail, ":gc")) {
2188 FLAG_SET_CMDLINE(bool, PrintGC, true);
2189 } else if (!strcmp(tail, ":jni")) {
2190 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2191 }
2192 // -da / -ea / -disableassertions / -enableassertions
2193 // These accept an optional class/package name separated by a colon, e.g.,
2194 // -da:java.lang.Thread.
2195 } else if (match_option(option, user_assertion_options, &tail, true)) {
2196 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2197 if (*tail == '\0') {
2198 JavaAssertions::setUserClassDefault(enable);
2199 } else {
2200 assert(*tail == ':', "bogus match by match_option()");
2201 JavaAssertions::addOption(tail + 1, enable);
2202 }
2203 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2204 } else if (match_option(option, system_assertion_options, &tail, false)) {
2205 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2206 JavaAssertions::setSystemClassDefault(enable);
2207 // -bootclasspath:
2208 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2209 scp_p->reset_path(tail);
2210 *scp_assembly_required_p = true;
2211 // -bootclasspath/a:
2212 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2213 scp_p->add_suffix(tail);
2214 *scp_assembly_required_p = true;
2215 // -bootclasspath/p:
2216 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2217 scp_p->add_prefix(tail);
2218 *scp_assembly_required_p = true;
2219 // -Xrun
2220 } else if (match_option(option, "-Xrun", &tail)) {
2221 if (tail != NULL) {
2222 const char* pos = strchr(tail, ':');
2223 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2224 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2225 name[len] = '\0';
2227 char *options = NULL;
2228 if(pos != NULL) {
2229 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2230 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2231 }
2232 #if !INCLUDE_JVMTI
2233 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2234 warning("profiling and debugging agents are not supported in this VM");
2235 } else
2236 #endif // !INCLUDE_JVMTI
2237 add_init_library(name, options);
2238 }
2239 // -agentlib and -agentpath
2240 } else if (match_option(option, "-agentlib:", &tail) ||
2241 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2242 if(tail != NULL) {
2243 const char* pos = strchr(tail, '=');
2244 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2245 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2246 name[len] = '\0';
2248 char *options = NULL;
2249 if(pos != NULL) {
2250 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2251 }
2252 #if !INCLUDE_JVMTI
2253 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2254 warning("profiling and debugging agents are not supported in this VM");
2255 } else
2256 #endif // !INCLUDE_JVMTI
2257 add_init_agent(name, options, is_absolute_path);
2259 }
2260 // -javaagent
2261 } else if (match_option(option, "-javaagent:", &tail)) {
2262 #if !INCLUDE_JVMTI
2263 warning("Instrumentation agents are not supported in this VM");
2264 #else
2265 if(tail != NULL) {
2266 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2267 add_init_agent("instrument", options, false);
2268 }
2269 #endif // !INCLUDE_JVMTI
2270 // -Xnoclassgc
2271 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2272 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2273 // -Xincgc: i-CMS
2274 } else if (match_option(option, "-Xincgc", &tail)) {
2275 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2276 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2277 // -Xnoincgc: no i-CMS
2278 } else if (match_option(option, "-Xnoincgc", &tail)) {
2279 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2280 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2281 // -Xconcgc
2282 } else if (match_option(option, "-Xconcgc", &tail)) {
2283 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2284 // -Xnoconcgc
2285 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2286 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2287 // -Xbatch
2288 } else if (match_option(option, "-Xbatch", &tail)) {
2289 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2290 // -Xmn for compatibility with other JVM vendors
2291 } else if (match_option(option, "-Xmn", &tail)) {
2292 julong long_initial_eden_size = 0;
2293 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2294 if (errcode != arg_in_range) {
2295 jio_fprintf(defaultStream::error_stream(),
2296 "Invalid initial eden size: %s\n", option->optionString);
2297 describe_range_error(errcode);
2298 return JNI_EINVAL;
2299 }
2300 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2301 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2302 // -Xms
2303 } else if (match_option(option, "-Xms", &tail)) {
2304 julong long_initial_heap_size = 0;
2305 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2306 if (errcode != arg_in_range) {
2307 jio_fprintf(defaultStream::error_stream(),
2308 "Invalid initial heap size: %s\n", option->optionString);
2309 describe_range_error(errcode);
2310 return JNI_EINVAL;
2311 }
2312 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2313 // Currently the minimum size and the initial heap sizes are the same.
2314 set_min_heap_size(InitialHeapSize);
2315 // -Xmx
2316 } else if (match_option(option, "-Xmx", &tail)) {
2317 julong long_max_heap_size = 0;
2318 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2319 if (errcode != arg_in_range) {
2320 jio_fprintf(defaultStream::error_stream(),
2321 "Invalid maximum heap size: %s\n", option->optionString);
2322 describe_range_error(errcode);
2323 return JNI_EINVAL;
2324 }
2325 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2326 // Xmaxf
2327 } else if (match_option(option, "-Xmaxf", &tail)) {
2328 int maxf = (int)(atof(tail) * 100);
2329 if (maxf < 0 || maxf > 100) {
2330 jio_fprintf(defaultStream::error_stream(),
2331 "Bad max heap free percentage size: %s\n",
2332 option->optionString);
2333 return JNI_EINVAL;
2334 } else {
2335 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2336 }
2337 // Xminf
2338 } else if (match_option(option, "-Xminf", &tail)) {
2339 int minf = (int)(atof(tail) * 100);
2340 if (minf < 0 || minf > 100) {
2341 jio_fprintf(defaultStream::error_stream(),
2342 "Bad min heap free percentage size: %s\n",
2343 option->optionString);
2344 return JNI_EINVAL;
2345 } else {
2346 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2347 }
2348 // -Xss
2349 } else if (match_option(option, "-Xss", &tail)) {
2350 julong long_ThreadStackSize = 0;
2351 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2352 if (errcode != arg_in_range) {
2353 jio_fprintf(defaultStream::error_stream(),
2354 "Invalid thread stack size: %s\n", option->optionString);
2355 describe_range_error(errcode);
2356 return JNI_EINVAL;
2357 }
2358 // Internally track ThreadStackSize in units of 1024 bytes.
2359 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2360 round_to((int)long_ThreadStackSize, K) / K);
2361 // -Xoss
2362 } else if (match_option(option, "-Xoss", &tail)) {
2363 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2364 // -Xmaxjitcodesize
2365 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2366 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2367 julong long_ReservedCodeCacheSize = 0;
2368 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2369 (size_t)InitialCodeCacheSize);
2370 if (errcode != arg_in_range) {
2371 jio_fprintf(defaultStream::error_stream(),
2372 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2373 option->optionString, InitialCodeCacheSize/K);
2374 describe_range_error(errcode);
2375 return JNI_EINVAL;
2376 }
2377 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2378 // -green
2379 } else if (match_option(option, "-green", &tail)) {
2380 jio_fprintf(defaultStream::error_stream(),
2381 "Green threads support not available\n");
2382 return JNI_EINVAL;
2383 // -native
2384 } else if (match_option(option, "-native", &tail)) {
2385 // HotSpot always uses native threads, ignore silently for compatibility
2386 // -Xsqnopause
2387 } else if (match_option(option, "-Xsqnopause", &tail)) {
2388 // EVM option, ignore silently for compatibility
2389 // -Xrs
2390 } else if (match_option(option, "-Xrs", &tail)) {
2391 // Classic/EVM option, new functionality
2392 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2393 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2394 // change default internal VM signals used - lower case for back compat
2395 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2396 // -Xoptimize
2397 } else if (match_option(option, "-Xoptimize", &tail)) {
2398 // EVM option, ignore silently for compatibility
2399 // -Xprof
2400 } else if (match_option(option, "-Xprof", &tail)) {
2401 #if INCLUDE_FPROF
2402 _has_profile = true;
2403 #else // INCLUDE_FPROF
2404 // do we have to exit?
2405 warning("Flat profiling is not supported in this VM.");
2406 #endif // INCLUDE_FPROF
2407 // -Xaprof
2408 } else if (match_option(option, "-Xaprof", &tail)) {
2409 _has_alloc_profile = true;
2410 // -Xconcurrentio
2411 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2412 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2413 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2414 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2415 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2416 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2418 // -Xinternalversion
2419 } else if (match_option(option, "-Xinternalversion", &tail)) {
2420 jio_fprintf(defaultStream::output_stream(), "%s\n",
2421 VM_Version::internal_vm_info_string());
2422 vm_exit(0);
2423 #ifndef PRODUCT
2424 // -Xprintflags
2425 } else if (match_option(option, "-Xprintflags", &tail)) {
2426 CommandLineFlags::printFlags(tty, false);
2427 vm_exit(0);
2428 #endif
2429 // -D
2430 } else if (match_option(option, "-D", &tail)) {
2431 if (!add_property(tail)) {
2432 return JNI_ENOMEM;
2433 }
2434 // Out of the box management support
2435 if (match_option(option, "-Dcom.sun.management", &tail)) {
2436 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2437 }
2438 // -Xint
2439 } else if (match_option(option, "-Xint", &tail)) {
2440 set_mode_flags(_int);
2441 // -Xmixed
2442 } else if (match_option(option, "-Xmixed", &tail)) {
2443 set_mode_flags(_mixed);
2444 // -Xcomp
2445 } else if (match_option(option, "-Xcomp", &tail)) {
2446 // for testing the compiler; turn off all flags that inhibit compilation
2447 set_mode_flags(_comp);
2449 // -Xshare:dump
2450 } else if (match_option(option, "-Xshare:dump", &tail)) {
2451 #if defined(KERNEL)
2452 vm_exit_during_initialization(
2453 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2454 #elif !INCLUDE_CDS
2455 vm_exit_during_initialization(
2456 "Dumping a shared archive is not supported in this VM.", NULL);
2457 #else
2458 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2459 set_mode_flags(_int); // Prevent compilation, which creates objects
2460 #endif
2461 // -Xshare:on
2462 } else if (match_option(option, "-Xshare:on", &tail)) {
2463 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2464 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2465 // -Xshare:auto
2466 } else if (match_option(option, "-Xshare:auto", &tail)) {
2467 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2468 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2469 // -Xshare:off
2470 } else if (match_option(option, "-Xshare:off", &tail)) {
2471 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2472 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2474 // -Xverify
2475 } else if (match_option(option, "-Xverify", &tail)) {
2476 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2477 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2478 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2479 } else if (strcmp(tail, ":remote") == 0) {
2480 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2481 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2482 } else if (strcmp(tail, ":none") == 0) {
2483 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2484 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2485 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2486 return JNI_EINVAL;
2487 }
2488 // -Xdebug
2489 } else if (match_option(option, "-Xdebug", &tail)) {
2490 // note this flag has been used, then ignore
2491 set_xdebug_mode(true);
2492 // -Xnoagent
2493 } else if (match_option(option, "-Xnoagent", &tail)) {
2494 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2495 } else if (match_option(option, "-Xboundthreads", &tail)) {
2496 // Bind user level threads to kernel threads (Solaris only)
2497 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2498 } else if (match_option(option, "-Xloggc:", &tail)) {
2499 // Redirect GC output to the file. -Xloggc:<filename>
2500 // ostream_init_log(), when called will use this filename
2501 // to initialize a fileStream.
2502 _gc_log_filename = strdup(tail);
2503 FLAG_SET_CMDLINE(bool, PrintGC, true);
2504 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2506 // JNI hooks
2507 } else if (match_option(option, "-Xcheck", &tail)) {
2508 if (!strcmp(tail, ":jni")) {
2509 #if !INCLUDE_JNI_CHECK
2510 warning("JNI CHECKING is not supported in this VM");
2511 #else
2512 CheckJNICalls = true;
2513 #endif // INCLUDE_JNI_CHECK
2514 } else if (is_bad_option(option, args->ignoreUnrecognized,
2515 "check")) {
2516 return JNI_EINVAL;
2517 }
2518 } else if (match_option(option, "vfprintf", &tail)) {
2519 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2520 } else if (match_option(option, "exit", &tail)) {
2521 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2522 } else if (match_option(option, "abort", &tail)) {
2523 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2524 // -XX:+AggressiveHeap
2525 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2527 // This option inspects the machine and attempts to set various
2528 // parameters to be optimal for long-running, memory allocation
2529 // intensive jobs. It is intended for machines with large
2530 // amounts of cpu and memory.
2532 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2533 // VM, but we may not be able to represent the total physical memory
2534 // available (like having 8gb of memory on a box but using a 32bit VM).
2535 // Thus, we need to make sure we're using a julong for intermediate
2536 // calculations.
2537 julong initHeapSize;
2538 julong total_memory = os::physical_memory();
2540 if (total_memory < (julong)256*M) {
2541 jio_fprintf(defaultStream::error_stream(),
2542 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2543 vm_exit(1);
2544 }
2546 // The heap size is half of available memory, or (at most)
2547 // all of possible memory less 160mb (leaving room for the OS
2548 // when using ISM). This is the maximum; because adaptive sizing
2549 // is turned on below, the actual space used may be smaller.
2551 initHeapSize = MIN2(total_memory / (julong)2,
2552 total_memory - (julong)160*M);
2554 // Make sure that if we have a lot of memory we cap the 32 bit
2555 // process space. The 64bit VM version of this function is a nop.
2556 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2558 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2559 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2560 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2561 // Currently the minimum size and the initial heap sizes are the same.
2562 set_min_heap_size(initHeapSize);
2563 }
2564 if (FLAG_IS_DEFAULT(NewSize)) {
2565 // Make the young generation 3/8ths of the total heap.
2566 FLAG_SET_CMDLINE(uintx, NewSize,
2567 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2568 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2569 }
2571 FLAG_SET_DEFAULT(UseLargePages, true);
2573 // Increase some data structure sizes for efficiency
2574 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2575 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2576 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2578 // See the OldPLABSize comment below, but replace 'after promotion'
2579 // with 'after copying'. YoungPLABSize is the size of the survivor
2580 // space per-gc-thread buffers. The default is 4kw.
2581 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2583 // OldPLABSize is the size of the buffers in the old gen that
2584 // UseParallelGC uses to promote live data that doesn't fit in the
2585 // survivor spaces. At any given time, there's one for each gc thread.
2586 // The default size is 1kw. These buffers are rarely used, since the
2587 // survivor spaces are usually big enough. For specjbb, however, there
2588 // are occasions when there's lots of live data in the young gen
2589 // and we end up promoting some of it. We don't have a definite
2590 // explanation for why bumping OldPLABSize helps, but the theory
2591 // is that a bigger PLAB results in retaining something like the
2592 // original allocation order after promotion, which improves mutator
2593 // locality. A minor effect may be that larger PLABs reduce the
2594 // number of PLAB allocation events during gc. The value of 8kw
2595 // was arrived at by experimenting with specjbb.
2596 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2598 // Enable parallel GC and adaptive generation sizing
2599 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2600 FLAG_SET_DEFAULT(ParallelGCThreads,
2601 Abstract_VM_Version::parallel_worker_threads());
2603 // Encourage steady state memory management
2604 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2606 // This appears to improve mutator locality
2607 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2609 // Get around early Solaris scheduling bug
2610 // (affinity vs other jobs on system)
2611 // but disallow DR and offlining (5008695).
2612 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2614 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2615 // The last option must always win.
2616 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2617 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2618 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2619 // The last option must always win.
2620 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2621 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2622 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2623 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2624 jio_fprintf(defaultStream::error_stream(),
2625 "Please use CMSClassUnloadingEnabled in place of "
2626 "CMSPermGenSweepingEnabled in the future\n");
2627 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2628 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2629 jio_fprintf(defaultStream::error_stream(),
2630 "Please use -XX:+UseGCOverheadLimit in place of "
2631 "-XX:+UseGCTimeLimit in the future\n");
2632 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2633 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2634 jio_fprintf(defaultStream::error_stream(),
2635 "Please use -XX:-UseGCOverheadLimit in place of "
2636 "-XX:-UseGCTimeLimit in the future\n");
2637 // The TLE options are for compatibility with 1.3 and will be
2638 // removed without notice in a future release. These options
2639 // are not to be documented.
2640 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2641 // No longer used.
2642 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2643 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2644 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2645 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2646 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2647 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2648 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2649 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2650 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2651 // No longer used.
2652 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2653 julong long_tlab_size = 0;
2654 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2655 if (errcode != arg_in_range) {
2656 jio_fprintf(defaultStream::error_stream(),
2657 "Invalid TLAB size: %s\n", option->optionString);
2658 describe_range_error(errcode);
2659 return JNI_EINVAL;
2660 }
2661 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2662 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2663 // No longer used.
2664 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2665 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2666 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2667 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2668 SOLARIS_ONLY(
2669 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2670 warning("-XX:+UsePermISM is obsolete.");
2671 FLAG_SET_CMDLINE(bool, UseISM, true);
2672 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2673 FLAG_SET_CMDLINE(bool, UseISM, false);
2674 )
2675 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2676 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2677 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2678 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2679 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2680 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2681 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2682 #if defined(DTRACE_ENABLED)
2683 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2684 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2685 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2686 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2687 #else // defined(DTRACE_ENABLED)
2688 jio_fprintf(defaultStream::error_stream(),
2689 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2690 return JNI_EINVAL;
2691 #endif // defined(DTRACE_ENABLED)
2692 #ifdef ASSERT
2693 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2694 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2695 // disable scavenge before parallel mark-compact
2696 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2697 #endif
2698 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2699 julong cms_blocks_to_claim = (julong)atol(tail);
2700 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2701 jio_fprintf(defaultStream::error_stream(),
2702 "Please use -XX:OldPLABSize in place of "
2703 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2704 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2705 julong cms_blocks_to_claim = (julong)atol(tail);
2706 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2707 jio_fprintf(defaultStream::error_stream(),
2708 "Please use -XX:OldPLABSize in place of "
2709 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2710 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2711 julong old_plab_size = 0;
2712 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2713 if (errcode != arg_in_range) {
2714 jio_fprintf(defaultStream::error_stream(),
2715 "Invalid old PLAB size: %s\n", option->optionString);
2716 describe_range_error(errcode);
2717 return JNI_EINVAL;
2718 }
2719 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2720 jio_fprintf(defaultStream::error_stream(),
2721 "Please use -XX:OldPLABSize in place of "
2722 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2723 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2724 julong young_plab_size = 0;
2725 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2726 if (errcode != arg_in_range) {
2727 jio_fprintf(defaultStream::error_stream(),
2728 "Invalid young PLAB size: %s\n", option->optionString);
2729 describe_range_error(errcode);
2730 return JNI_EINVAL;
2731 }
2732 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2733 jio_fprintf(defaultStream::error_stream(),
2734 "Please use -XX:YoungPLABSize in place of "
2735 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2736 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2737 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2738 julong stack_size = 0;
2739 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2740 if (errcode != arg_in_range) {
2741 jio_fprintf(defaultStream::error_stream(),
2742 "Invalid mark stack size: %s\n", option->optionString);
2743 describe_range_error(errcode);
2744 return JNI_EINVAL;
2745 }
2746 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2747 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2748 julong max_stack_size = 0;
2749 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2750 if (errcode != arg_in_range) {
2751 jio_fprintf(defaultStream::error_stream(),
2752 "Invalid maximum mark stack size: %s\n",
2753 option->optionString);
2754 describe_range_error(errcode);
2755 return JNI_EINVAL;
2756 }
2757 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2758 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2759 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2760 uintx conc_threads = 0;
2761 if (!parse_uintx(tail, &conc_threads, 1)) {
2762 jio_fprintf(defaultStream::error_stream(),
2763 "Invalid concurrent threads: %s\n", option->optionString);
2764 return JNI_EINVAL;
2765 }
2766 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2767 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
2768 julong max_direct_memory_size = 0;
2769 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
2770 if (errcode != arg_in_range) {
2771 jio_fprintf(defaultStream::error_stream(),
2772 "Invalid maximum direct memory size: %s\n",
2773 option->optionString);
2774 describe_range_error(errcode);
2775 return JNI_EINVAL;
2776 }
2777 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
2778 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
2779 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
2780 // away and will cause VM initialization failures!
2781 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
2782 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
2783 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2784 // Skip -XX:Flags= since that case has already been handled
2785 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2786 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2787 return JNI_EINVAL;
2788 }
2789 }
2790 // Unknown option
2791 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2792 return JNI_ERR;
2793 }
2794 }
2796 // Change the default value for flags which have different default values
2797 // when working with older JDKs.
2798 #ifdef LINUX
2799 if (JDK_Version::current().compare_major(6) <= 0 &&
2800 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2801 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2802 }
2803 #endif // LINUX
2804 return JNI_OK;
2805 }
2807 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2808 // This must be done after all -D arguments have been processed.
2809 scp_p->expand_endorsed();
2811 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2812 // Assemble the bootclasspath elements into the final path.
2813 Arguments::set_sysclasspath(scp_p->combined_path());
2814 }
2816 // This must be done after all arguments have been processed.
2817 // java_compiler() true means set to "NONE" or empty.
2818 if (java_compiler() && !xdebug_mode()) {
2819 // For backwards compatibility, we switch to interpreted mode if
2820 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2821 // not specified.
2822 set_mode_flags(_int);
2823 }
2824 if (CompileThreshold == 0) {
2825 set_mode_flags(_int);
2826 }
2828 #ifndef COMPILER2
2829 // Don't degrade server performance for footprint
2830 if (FLAG_IS_DEFAULT(UseLargePages) &&
2831 MaxHeapSize < LargePageHeapSizeThreshold) {
2832 // No need for large granularity pages w/small heaps.
2833 // Note that large pages are enabled/disabled for both the
2834 // Java heap and the code cache.
2835 FLAG_SET_DEFAULT(UseLargePages, false);
2836 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2837 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2838 }
2840 // Tiered compilation is undefined with C1.
2841 TieredCompilation = false;
2842 #else
2843 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2844 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2845 }
2846 #endif
2848 // If we are running in a headless jre, force java.awt.headless property
2849 // to be true unless the property has already been set.
2850 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2851 if (os::is_headless_jre()) {
2852 const char* headless = Arguments::get_property("java.awt.headless");
2853 if (headless == NULL) {
2854 char envbuffer[128];
2855 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2856 if (!add_property("java.awt.headless=true")) {
2857 return JNI_ENOMEM;
2858 }
2859 } else {
2860 char buffer[256];
2861 strcpy(buffer, "java.awt.headless=");
2862 strcat(buffer, envbuffer);
2863 if (!add_property(buffer)) {
2864 return JNI_ENOMEM;
2865 }
2866 }
2867 }
2868 }
2870 if (!check_vm_args_consistency()) {
2871 return JNI_ERR;
2872 }
2874 return JNI_OK;
2875 }
2877 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2878 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2879 scp_assembly_required_p);
2880 }
2882 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2883 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2884 scp_assembly_required_p);
2885 }
2887 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2888 const int N_MAX_OPTIONS = 64;
2889 const int OPTION_BUFFER_SIZE = 1024;
2890 char buffer[OPTION_BUFFER_SIZE];
2892 // The variable will be ignored if it exceeds the length of the buffer.
2893 // Don't check this variable if user has special privileges
2894 // (e.g. unix su command).
2895 if (os::getenv(name, buffer, sizeof(buffer)) &&
2896 !os::have_special_privileges()) {
2897 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2898 jio_fprintf(defaultStream::error_stream(),
2899 "Picked up %s: %s\n", name, buffer);
2900 char* rd = buffer; // pointer to the input string (rd)
2901 int i;
2902 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2903 while (isspace(*rd)) rd++; // skip whitespace
2904 if (*rd == 0) break; // we re done when the input string is read completely
2906 // The output, option string, overwrites the input string.
2907 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2908 // input string (rd).
2909 char* wrt = rd;
2911 options[i++].optionString = wrt; // Fill in option
2912 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2913 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2914 int quote = *rd; // matching quote to look for
2915 rd++; // don't copy open quote
2916 while (*rd != quote) { // include everything (even spaces) up until quote
2917 if (*rd == 0) { // string termination means unmatched string
2918 jio_fprintf(defaultStream::error_stream(),
2919 "Unmatched quote in %s\n", name);
2920 return JNI_ERR;
2921 }
2922 *wrt++ = *rd++; // copy to option string
2923 }
2924 rd++; // don't copy close quote
2925 } else {
2926 *wrt++ = *rd++; // copy to option string
2927 }
2928 }
2929 // Need to check if we're done before writing a NULL,
2930 // because the write could be to the byte that rd is pointing to.
2931 if (*rd++ == 0) {
2932 *wrt = 0;
2933 break;
2934 }
2935 *wrt = 0; // Zero terminate option
2936 }
2937 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2938 JavaVMInitArgs vm_args;
2939 vm_args.version = JNI_VERSION_1_2;
2940 vm_args.options = options;
2941 vm_args.nOptions = i;
2942 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2944 if (PrintVMOptions) {
2945 const char* tail;
2946 for (int i = 0; i < vm_args.nOptions; i++) {
2947 const JavaVMOption *option = vm_args.options + i;
2948 if (match_option(option, "-XX:", &tail)) {
2949 logOption(tail);
2950 }
2951 }
2952 }
2954 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2955 }
2956 return JNI_OK;
2957 }
2959 void Arguments::set_shared_spaces_flags() {
2960 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
2961 const bool might_share = must_share || UseSharedSpaces;
2963 // CompressedOops cannot be used with CDS. The offsets of oopmaps and
2964 // static fields are incorrect in the archive. With some more clever
2965 // initialization, this restriction can probably be lifted.
2966 // ??? UseLargePages might be okay now
2967 const bool cannot_share = UseCompressedOops ||
2968 (UseLargePages && FLAG_IS_CMDLINE(UseLargePages));
2969 if (cannot_share) {
2970 if (must_share) {
2971 warning("disabling large pages %s"
2972 "because of %s", "" LP64_ONLY("and compressed oops "),
2973 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
2974 FLAG_SET_CMDLINE(bool, UseLargePages, false);
2975 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
2976 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false));
2977 } else {
2978 // Prefer compressed oops and large pages to class data sharing
2979 if (UseSharedSpaces && Verbose) {
2980 warning("turning off use of shared archive because of large pages%s",
2981 "" LP64_ONLY(" and/or compressed oops"));
2982 }
2983 no_shared_spaces();
2984 }
2985 } else if (UseLargePages && might_share) {
2986 // Disable large pages to allow shared spaces. This is sub-optimal, since
2987 // there may not even be a shared archive to use.
2988 FLAG_SET_DEFAULT(UseLargePages, false);
2989 }
2991 // Add 2M to any size for SharedReadOnlySize to get around the JPRT setting
2992 if (DumpSharedSpaces && !FLAG_IS_DEFAULT(SharedReadOnlySize)) {
2993 SharedReadOnlySize = 14*M;
2994 }
2996 if (DumpSharedSpaces) {
2997 if (RequireSharedSpaces) {
2998 warning("cannot dump shared archive while using shared archive");
2999 }
3000 UseSharedSpaces = false;
3001 }
3002 }
3004 // Disable options not supported in this release, with a warning if they
3005 // were explicitly requested on the command-line
3006 #define UNSUPPORTED_OPTION(opt, description) \
3007 do { \
3008 if (opt) { \
3009 if (FLAG_IS_CMDLINE(opt)) { \
3010 warning(description " is disabled in this release."); \
3011 } \
3012 FLAG_SET_DEFAULT(opt, false); \
3013 } \
3014 } while(0)
3016 // Parse entry point called from JNI_CreateJavaVM
3018 jint Arguments::parse(const JavaVMInitArgs* args) {
3020 // Sharing support
3021 // Construct the path to the archive
3022 char jvm_path[JVM_MAXPATHLEN];
3023 os::jvm_path(jvm_path, sizeof(jvm_path));
3024 char *end = strrchr(jvm_path, *os::file_separator());
3025 if (end != NULL) *end = '\0';
3026 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
3027 strlen(os::file_separator()) + 20, mtInternal);
3028 if (shared_archive_path == NULL) return JNI_ENOMEM;
3029 strcpy(shared_archive_path, jvm_path);
3030 strcat(shared_archive_path, os::file_separator());
3031 strcat(shared_archive_path, "classes");
3032 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
3033 strcat(shared_archive_path, ".jsa");
3034 SharedArchivePath = shared_archive_path;
3036 // Remaining part of option string
3037 const char* tail;
3039 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3040 const char* hotspotrc = ".hotspotrc";
3041 bool settings_file_specified = false;
3042 bool needs_hotspotrc_warning = false;
3044 const char* flags_file;
3045 int index;
3046 for (index = 0; index < args->nOptions; index++) {
3047 const JavaVMOption *option = args->options + index;
3048 if (match_option(option, "-XX:Flags=", &tail)) {
3049 flags_file = tail;
3050 settings_file_specified = true;
3051 }
3052 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3053 PrintVMOptions = true;
3054 }
3055 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3056 PrintVMOptions = false;
3057 }
3058 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3059 IgnoreUnrecognizedVMOptions = true;
3060 }
3061 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3062 IgnoreUnrecognizedVMOptions = false;
3063 }
3064 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3065 CommandLineFlags::printFlags(tty, false);
3066 vm_exit(0);
3067 }
3068 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3069 #if INCLUDE_NMT
3070 MemTracker::init_tracking_options(tail);
3071 #else
3072 warning("Native Memory Tracking is not supported in this VM");
3073 #endif
3074 }
3077 #ifndef PRODUCT
3078 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3079 CommandLineFlags::printFlags(tty, true);
3080 vm_exit(0);
3081 }
3082 #endif
3083 }
3085 if (IgnoreUnrecognizedVMOptions) {
3086 // uncast const to modify the flag args->ignoreUnrecognized
3087 *(jboolean*)(&args->ignoreUnrecognized) = true;
3088 }
3090 // Parse specified settings file
3091 if (settings_file_specified) {
3092 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3093 return JNI_EINVAL;
3094 }
3095 } else {
3096 #ifdef ASSERT
3097 // Parse default .hotspotrc settings file
3098 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3099 return JNI_EINVAL;
3100 }
3101 #else
3102 struct stat buf;
3103 if (os::stat(hotspotrc, &buf) == 0) {
3104 needs_hotspotrc_warning = true;
3105 }
3106 #endif
3107 }
3109 if (PrintVMOptions) {
3110 for (index = 0; index < args->nOptions; index++) {
3111 const JavaVMOption *option = args->options + index;
3112 if (match_option(option, "-XX:", &tail)) {
3113 logOption(tail);
3114 }
3115 }
3116 }
3118 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3119 jint result = parse_vm_init_args(args);
3120 if (result != JNI_OK) {
3121 return result;
3122 }
3124 // Delay warning until here so that we've had a chance to process
3125 // the -XX:-PrintWarnings flag
3126 if (needs_hotspotrc_warning) {
3127 warning("%s file is present but has been ignored. "
3128 "Run with -XX:Flags=%s to load the file.",
3129 hotspotrc, hotspotrc);
3130 }
3132 #if (defined JAVASE_EMBEDDED || defined ARM)
3133 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3134 #endif
3136 #if !INCLUDE_ALTERNATE_GCS
3137 if (UseParallelGC) {
3138 warning("Parallel GC is not supported in this VM. Using Serial GC.");
3139 }
3140 if (UseParallelOldGC) {
3141 warning("Parallel Old GC is not supported in this VM. Using Serial GC.");
3142 }
3143 if (UseConcMarkSweepGC) {
3144 warning("Concurrent Mark Sweep GC is not supported in this VM. Using Serial GC.");
3145 }
3146 if (UseParNewGC) {
3147 warning("Par New GC is not supported in this VM. Using Serial GC.");
3148 }
3149 #endif // INCLUDE_ALTERNATE_GCS
3151 #ifndef PRODUCT
3152 if (TraceBytecodesAt != 0) {
3153 TraceBytecodes = true;
3154 }
3155 if (CountCompiledCalls) {
3156 if (UseCounterDecay) {
3157 warning("UseCounterDecay disabled because CountCalls is set");
3158 UseCounterDecay = false;
3159 }
3160 }
3161 #endif // PRODUCT
3163 // JSR 292 is not supported before 1.7
3164 if (!JDK_Version::is_gte_jdk17x_version()) {
3165 if (EnableInvokeDynamic) {
3166 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3167 warning("JSR 292 is not supported before 1.7. Disabling support.");
3168 }
3169 EnableInvokeDynamic = false;
3170 }
3171 }
3173 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3174 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3175 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3176 }
3177 ScavengeRootsInCode = 1;
3178 }
3180 if (PrintGCDetails) {
3181 // Turn on -verbose:gc options as well
3182 PrintGC = true;
3183 }
3185 if (!JDK_Version::is_gte_jdk18x_version()) {
3186 // To avoid changing the log format for 7 updates this flag is only
3187 // true by default in JDK8 and above.
3188 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3189 FLAG_SET_DEFAULT(PrintGCCause, false);
3190 }
3191 }
3193 // Set object alignment values.
3194 set_object_alignment();
3196 #ifdef SERIALGC
3197 force_serial_gc();
3198 #endif // SERIALGC
3199 #if !INCLUDE_CDS
3200 no_shared_spaces();
3201 #endif // INCLUDE_CDS
3203 // Set flags based on ergonomics.
3204 set_ergonomics_flags();
3206 set_shared_spaces_flags();
3208 // Check the GC selections again.
3209 if (!check_gc_consistency()) {
3210 return JNI_EINVAL;
3211 }
3213 if (TieredCompilation) {
3214 set_tiered_flags();
3215 } else {
3216 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3217 if (CompilationPolicyChoice >= 2) {
3218 vm_exit_during_initialization(
3219 "Incompatible compilation policy selected", NULL);
3220 }
3221 }
3223 // Set heap size based on available physical memory
3224 set_heap_size();
3226 #if INCLUDE_ALTERNATE_GCS
3227 // Set per-collector flags
3228 if (UseParallelGC || UseParallelOldGC) {
3229 set_parallel_gc_flags();
3230 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3231 set_cms_and_parnew_gc_flags();
3232 } else if (UseParNewGC) { // skipped if CMS is set above
3233 set_parnew_gc_flags();
3234 } else if (UseG1GC) {
3235 set_g1_gc_flags();
3236 }
3237 #endif // INCLUDE_ALTERNATE_GCS
3239 #ifdef SERIALGC
3240 assert(verify_serial_gc_flags(), "SerialGC unset");
3241 #endif // SERIALGC
3243 // Set bytecode rewriting flags
3244 set_bytecode_flags();
3246 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3247 set_aggressive_opts_flags();
3249 // Turn off biased locking for locking debug mode flags,
3250 // which are subtlely different from each other but neither works with
3251 // biased locking.
3252 if (UseHeavyMonitors
3253 #ifdef COMPILER1
3254 || !UseFastLocking
3255 #endif // COMPILER1
3256 ) {
3257 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3258 // flag set to true on command line; warn the user that they
3259 // can't enable biased locking here
3260 warning("Biased Locking is not supported with locking debug flags"
3261 "; ignoring UseBiasedLocking flag." );
3262 }
3263 UseBiasedLocking = false;
3264 }
3266 #ifdef CC_INTERP
3267 // Clear flags not supported by the C++ interpreter
3268 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3269 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3270 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3271 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
3272 #endif // CC_INTERP
3274 #ifdef COMPILER2
3275 if (!UseBiasedLocking || EmitSync != 0) {
3276 UseOptoBiasInlining = false;
3277 }
3278 if (!EliminateLocks) {
3279 EliminateNestedLocks = false;
3280 }
3281 #endif
3283 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3284 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3285 DebugNonSafepoints = true;
3286 }
3288 #ifndef PRODUCT
3289 if (CompileTheWorld) {
3290 // Force NmethodSweeper to sweep whole CodeCache each time.
3291 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3292 NmethodSweepFraction = 1;
3293 }
3294 }
3295 #endif
3297 if (PrintCommandLineFlags) {
3298 CommandLineFlags::printSetFlags(tty);
3299 }
3301 // Apply CPU specific policy for the BiasedLocking
3302 if (UseBiasedLocking) {
3303 if (!VM_Version::use_biased_locking() &&
3304 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3305 UseBiasedLocking = false;
3306 }
3307 }
3309 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3310 // but only if not already set on the commandline
3311 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3312 bool set = false;
3313 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3314 if (!set) {
3315 FLAG_SET_DEFAULT(PauseAtExit, true);
3316 }
3317 }
3319 return JNI_OK;
3320 }
3322 int Arguments::PropertyList_count(SystemProperty* pl) {
3323 int count = 0;
3324 while(pl != NULL) {
3325 count++;
3326 pl = pl->next();
3327 }
3328 return count;
3329 }
3331 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3332 assert(key != NULL, "just checking");
3333 SystemProperty* prop;
3334 for (prop = pl; prop != NULL; prop = prop->next()) {
3335 if (strcmp(key, prop->key()) == 0) return prop->value();
3336 }
3337 return NULL;
3338 }
3340 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3341 int count = 0;
3342 const char* ret_val = NULL;
3344 while(pl != NULL) {
3345 if(count >= index) {
3346 ret_val = pl->key();
3347 break;
3348 }
3349 count++;
3350 pl = pl->next();
3351 }
3353 return ret_val;
3354 }
3356 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3357 int count = 0;
3358 char* ret_val = NULL;
3360 while(pl != NULL) {
3361 if(count >= index) {
3362 ret_val = pl->value();
3363 break;
3364 }
3365 count++;
3366 pl = pl->next();
3367 }
3369 return ret_val;
3370 }
3372 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3373 SystemProperty* p = *plist;
3374 if (p == NULL) {
3375 *plist = new_p;
3376 } else {
3377 while (p->next() != NULL) {
3378 p = p->next();
3379 }
3380 p->set_next(new_p);
3381 }
3382 }
3384 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3385 if (plist == NULL)
3386 return;
3388 SystemProperty* new_p = new SystemProperty(k, v, true);
3389 PropertyList_add(plist, new_p);
3390 }
3392 // This add maintains unique property key in the list.
3393 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3394 if (plist == NULL)
3395 return;
3397 // If property key exist then update with new value.
3398 SystemProperty* prop;
3399 for (prop = *plist; prop != NULL; prop = prop->next()) {
3400 if (strcmp(k, prop->key()) == 0) {
3401 if (append) {
3402 prop->append_value(v);
3403 } else {
3404 prop->set_value(v);
3405 }
3406 return;
3407 }
3408 }
3410 PropertyList_add(plist, k, v);
3411 }
3413 #ifdef KERNEL
3414 char *Arguments::get_kernel_properties() {
3415 // Find properties starting with kernel and append them to string
3416 // We need to find out how long they are first because the URL's that they
3417 // might point to could get long.
3418 int length = 0;
3419 SystemProperty* prop;
3420 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3421 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3422 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3423 }
3424 }
3425 // Add one for null terminator.
3426 char *props = AllocateHeap(length + 1, mtInternal);
3427 if (length != 0) {
3428 int pos = 0;
3429 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3430 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3431 jio_snprintf(&props[pos], length-pos,
3432 "-D%s=%s ", prop->key(), prop->value());
3433 pos = strlen(props);
3434 }
3435 }
3436 }
3437 // null terminate props in case of null
3438 props[length] = '\0';
3439 return props;
3440 }
3441 #endif // KERNEL
3443 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3444 // Returns true if all of the source pointed by src has been copied over to
3445 // the destination buffer pointed by buf. Otherwise, returns false.
3446 // Notes:
3447 // 1. If the length (buflen) of the destination buffer excluding the
3448 // NULL terminator character is not long enough for holding the expanded
3449 // pid characters, it also returns false instead of returning the partially
3450 // expanded one.
3451 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3452 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3453 char* buf, size_t buflen) {
3454 const char* p = src;
3455 char* b = buf;
3456 const char* src_end = &src[srclen];
3457 char* buf_end = &buf[buflen - 1];
3459 while (p < src_end && b < buf_end) {
3460 if (*p == '%') {
3461 switch (*(++p)) {
3462 case '%': // "%%" ==> "%"
3463 *b++ = *p++;
3464 break;
3465 case 'p': { // "%p" ==> current process id
3466 // buf_end points to the character before the last character so
3467 // that we could write '\0' to the end of the buffer.
3468 size_t buf_sz = buf_end - b + 1;
3469 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3471 // if jio_snprintf fails or the buffer is not long enough to hold
3472 // the expanded pid, returns false.
3473 if (ret < 0 || ret >= (int)buf_sz) {
3474 return false;
3475 } else {
3476 b += ret;
3477 assert(*b == '\0', "fail in copy_expand_pid");
3478 if (p == src_end && b == buf_end + 1) {
3479 // reach the end of the buffer.
3480 return true;
3481 }
3482 }
3483 p++;
3484 break;
3485 }
3486 default :
3487 *b++ = '%';
3488 }
3489 } else {
3490 *b++ = *p++;
3491 }
3492 }
3493 *b = '\0';
3494 return (p == src_end); // return false if not all of the source was copied
3495 }