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 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "compiler/compilerOracle.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/cardTableRS.hpp"
31 #include "memory/referenceProcessor.hpp"
32 #include "memory/universe.inline.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "prims/jvmtiExport.hpp"
35 #include "runtime/arguments.hpp"
36 #include "runtime/globals_extension.hpp"
37 #include "runtime/java.hpp"
38 #include "services/management.hpp"
39 #include "services/memTracker.hpp"
40 #include "utilities/defaultStream.hpp"
41 #include "utilities/taskqueue.hpp"
42 #ifdef TARGET_OS_FAMILY_linux
43 # include "os_linux.inline.hpp"
44 #endif
45 #ifdef TARGET_OS_FAMILY_solaris
46 # include "os_solaris.inline.hpp"
47 #endif
48 #ifdef TARGET_OS_FAMILY_windows
49 # include "os_windows.inline.hpp"
50 #endif
51 #ifdef TARGET_OS_FAMILY_bsd
52 # include "os_bsd.inline.hpp"
53 #endif
54 #ifndef SERIALGC
55 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
56 #endif
57
58 // Note: This is a special bug reporting site for the JVM
59 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
60 #define DEFAULT_JAVA_LAUNCHER "generic"
61
62 char** Arguments::_jvm_flags_array = NULL;
63 int Arguments::_num_jvm_flags = 0;
64 char** Arguments::_jvm_args_array = NULL;
65 int Arguments::_num_jvm_args = 0;
66 char* Arguments::_java_command = NULL;
67 SystemProperty* Arguments::_system_properties = NULL;
68 const char* Arguments::_gc_log_filename = NULL;
69 bool Arguments::_has_profile = false;
70 bool Arguments::_has_alloc_profile = false;
71 uintx Arguments::_min_heap_size = 0;
72 Arguments::Mode Arguments::_mode = _mixed;
73 bool Arguments::_java_compiler = false;
74 bool Arguments::_xdebug_mode = false;
75 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
76 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
77 int Arguments::_sun_java_launcher_pid = -1;
78 bool Arguments::_created_by_gamma_launcher = false;
79
80 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
81 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
82 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
83 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
84 bool Arguments::_ClipInlining = ClipInlining;
85
86 char* Arguments::SharedArchivePath = NULL;
87
88 AgentLibraryList Arguments::_libraryList;
89 AgentLibraryList Arguments::_agentList;
90
91 abort_hook_t Arguments::_abort_hook = NULL;
92 exit_hook_t Arguments::_exit_hook = NULL;
93 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
94
95
96 SystemProperty *Arguments::_java_ext_dirs = NULL;
97 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
98 SystemProperty *Arguments::_sun_boot_library_path = NULL;
99 SystemProperty *Arguments::_java_library_path = NULL;
100 SystemProperty *Arguments::_java_home = NULL;
101 SystemProperty *Arguments::_java_class_path = NULL;
102 SystemProperty *Arguments::_sun_boot_class_path = NULL;
103
104 char* Arguments::_meta_index_path = NULL;
105 char* Arguments::_meta_index_dir = NULL;
106
107 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
108
109 static bool match_option(const JavaVMOption *option, const char* name,
110 const char** tail) {
111 int len = (int)strlen(name);
112 if (strncmp(option->optionString, name, len) == 0) {
113 *tail = option->optionString + len;
114 return true;
115 } else {
116 return false;
117 }
118 }
119
120 static void logOption(const char* opt) {
121 if (PrintVMOptions) {
122 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
123 }
124 }
125
126 // Process java launcher properties.
127 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
128 // See if sun.java.launcher or sun.java.launcher.pid is defined.
129 // Must do this before setting up other system properties,
130 // as some of them may depend on launcher type.
131 for (int index = 0; index < args->nOptions; index++) {
132 const JavaVMOption* option = args->options + index;
133 const char* tail;
134
135 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
136 process_java_launcher_argument(tail, option->extraInfo);
137 continue;
138 }
139 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
140 _sun_java_launcher_pid = atoi(tail);
141 continue;
142 }
143 }
144 }
145
146 // Initialize system properties key and value.
147 void Arguments::init_system_properties() {
148
149 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
150 "Java Virtual Machine Specification", false));
151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
154
155 // following are JVMTI agent writeable properties.
156 // Properties values are set to NULL and they are
157 // os specific they are initialized in os::init_system_properties_values().
158 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
159 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
160 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
161 _java_library_path = new SystemProperty("java.library.path", NULL, true);
162 _java_home = new SystemProperty("java.home", NULL, true);
163 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
164
165 _java_class_path = new SystemProperty("java.class.path", "", true);
166
167 // Add to System Property list.
168 PropertyList_add(&_system_properties, _java_ext_dirs);
169 PropertyList_add(&_system_properties, _java_endorsed_dirs);
170 PropertyList_add(&_system_properties, _sun_boot_library_path);
171 PropertyList_add(&_system_properties, _java_library_path);
172 PropertyList_add(&_system_properties, _java_home);
173 PropertyList_add(&_system_properties, _java_class_path);
174 PropertyList_add(&_system_properties, _sun_boot_class_path);
175
176 // Set OS specific system properties values
177 os::init_system_properties_values();
178 }
179
180
181 // Update/Initialize System properties after JDK version number is known
182 void Arguments::init_version_specific_system_properties() {
183 enum { bufsz = 16 };
184 char buffer[bufsz];
185 const char* spec_vendor = "Sun Microsystems Inc.";
186 uint32_t spec_version = 0;
187
188 if (JDK_Version::is_gte_jdk17x_version()) {
189 spec_vendor = "Oracle Corporation";
190 spec_version = JDK_Version::current().major_version();
191 }
192 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
193
194 PropertyList_add(&_system_properties,
195 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
196 PropertyList_add(&_system_properties,
197 new SystemProperty("java.vm.specification.version", buffer, false));
198 PropertyList_add(&_system_properties,
199 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
200 }
201
202 /**
203 * Provide a slightly more user-friendly way of eliminating -XX flags.
204 * When a flag is eliminated, it can be added to this list in order to
205 * continue accepting this flag on the command-line, while issuing a warning
206 * and ignoring the value. Once the JDK version reaches the 'accept_until'
207 * limit, we flatly refuse to admit the existence of the flag. This allows
208 * a flag to die correctly over JDK releases using HSX.
209 */
210 typedef struct {
211 const char* name;
212 JDK_Version obsoleted_in; // when the flag went away
213 JDK_Version accept_until; // which version to start denying the existence
214 } ObsoleteFlag;
215
216 static ObsoleteFlag obsolete_jvm_flags[] = {
217 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
218 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
230 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
231 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
232 { "DefaultInitialRAMFraction",
233 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
234 { "UseDepthFirstScavengeOrder",
235 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
236 { "HandlePromotionFailure",
237 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
238 { "MaxLiveObjectEvacuationRatio",
239 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
240 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
241 { "UseParallelOldGCCompacting",
242 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
243 { "UseParallelDensePrefixUpdate",
244 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
245 { "UseParallelOldGCDensePrefix",
246 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
247 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
248 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
249 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
250 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
251 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
252 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
253 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
254 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
255 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
256 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
257 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
258 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
259 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
260 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
261 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
262 #ifdef PRODUCT
263 { "DesiredMethodLimit",
264 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
265 #endif // PRODUCT
266 { NULL, JDK_Version(0), JDK_Version(0) }
267 };
268
269 // Returns true if the flag is obsolete and fits into the range specified
270 // for being ignored. In the case that the flag is ignored, the 'version'
271 // value is filled in with the version number when the flag became
272 // obsolete so that that value can be displayed to the user.
273 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
274 int i = 0;
275 assert(version != NULL, "Must provide a version buffer");
276 while (obsolete_jvm_flags[i].name != NULL) {
277 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
278 // <flag>=xxx form
279 // [-|+]<flag> form
280 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
281 ((s[0] == '+' || s[0] == '-') &&
282 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
283 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
284 *version = flag_status.obsoleted_in;
285 return true;
286 }
287 }
288 i++;
289 }
290 return false;
291 }
292
293 // Constructs the system class path (aka boot class path) from the following
294 // components, in order:
295 //
296 // prefix // from -Xbootclasspath/p:...
297 // endorsed // the expansion of -Djava.endorsed.dirs=...
298 // base // from os::get_system_properties() or -Xbootclasspath=
299 // suffix // from -Xbootclasspath/a:...
300 //
301 // java.endorsed.dirs is a list of directories; any jar or zip files in the
302 // directories are added to the sysclasspath just before the base.
303 //
304 // This could be AllStatic, but it isn't needed after argument processing is
305 // complete.
306 class SysClassPath: public StackObj {
307 public:
308 SysClassPath(const char* base);
309 ~SysClassPath();
310
311 inline void set_base(const char* base);
312 inline void add_prefix(const char* prefix);
313 inline void add_suffix_to_prefix(const char* suffix);
314 inline void add_suffix(const char* suffix);
315 inline void reset_path(const char* base);
316
317 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
318 // property. Must be called after all command-line arguments have been
319 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
320 // combined_path().
321 void expand_endorsed();
322
323 inline const char* get_base() const { return _items[_scp_base]; }
324 inline const char* get_prefix() const { return _items[_scp_prefix]; }
325 inline const char* get_suffix() const { return _items[_scp_suffix]; }
326 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
327
328 // Combine all the components into a single c-heap-allocated string; caller
329 // must free the string if/when no longer needed.
330 char* combined_path();
331
332 private:
333 // Utility routines.
334 static char* add_to_path(const char* path, const char* str, bool prepend);
335 static char* add_jars_to_path(char* path, const char* directory);
336
337 inline void reset_item_at(int index);
338
339 // Array indices for the items that make up the sysclasspath. All except the
340 // base are allocated in the C heap and freed by this class.
341 enum {
342 _scp_prefix, // from -Xbootclasspath/p:...
343 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
344 _scp_base, // the default sysclasspath
345 _scp_suffix, // from -Xbootclasspath/a:...
346 _scp_nitems // the number of items, must be last.
347 };
348
349 const char* _items[_scp_nitems];
350 DEBUG_ONLY(bool _expansion_done;)
351 };
352
353 SysClassPath::SysClassPath(const char* base) {
354 memset(_items, 0, sizeof(_items));
355 _items[_scp_base] = base;
356 DEBUG_ONLY(_expansion_done = false;)
357 }
358
359 SysClassPath::~SysClassPath() {
360 // Free everything except the base.
361 for (int i = 0; i < _scp_nitems; ++i) {
362 if (i != _scp_base) reset_item_at(i);
363 }
364 DEBUG_ONLY(_expansion_done = false;)
365 }
366
367 inline void SysClassPath::set_base(const char* base) {
368 _items[_scp_base] = base;
369 }
370
371 inline void SysClassPath::add_prefix(const char* prefix) {
372 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
373 }
374
375 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
376 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
377 }
378
379 inline void SysClassPath::add_suffix(const char* suffix) {
380 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
381 }
382
383 inline void SysClassPath::reset_item_at(int index) {
384 assert(index < _scp_nitems && index != _scp_base, "just checking");
385 if (_items[index] != NULL) {
386 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
387 _items[index] = NULL;
388 }
389 }
390
391 inline void SysClassPath::reset_path(const char* base) {
392 // Clear the prefix and suffix.
393 reset_item_at(_scp_prefix);
394 reset_item_at(_scp_suffix);
395 set_base(base);
396 }
397
398 //------------------------------------------------------------------------------
399
400 void SysClassPath::expand_endorsed() {
401 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
402
403 const char* path = Arguments::get_property("java.endorsed.dirs");
404 if (path == NULL) {
405 path = Arguments::get_endorsed_dir();
406 assert(path != NULL, "no default for java.endorsed.dirs");
407 }
408
409 char* expanded_path = NULL;
410 const char separator = *os::path_separator();
411 const char* const end = path + strlen(path);
412 while (path < end) {
413 const char* tmp_end = strchr(path, separator);
414 if (tmp_end == NULL) {
415 expanded_path = add_jars_to_path(expanded_path, path);
416 path = end;
417 } else {
418 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
419 memcpy(dirpath, path, tmp_end - path);
420 dirpath[tmp_end - path] = '\0';
421 expanded_path = add_jars_to_path(expanded_path, dirpath);
422 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
423 path = tmp_end + 1;
424 }
425 }
426 _items[_scp_endorsed] = expanded_path;
427 DEBUG_ONLY(_expansion_done = true;)
428 }
429
430 // Combine the bootclasspath elements, some of which may be null, into a single
431 // c-heap-allocated string.
432 char* SysClassPath::combined_path() {
433 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
434 assert(_expansion_done, "must call expand_endorsed() first.");
435
436 size_t lengths[_scp_nitems];
437 size_t total_len = 0;
438
439 const char separator = *os::path_separator();
440
441 // Get the lengths.
442 int i;
443 for (i = 0; i < _scp_nitems; ++i) {
444 if (_items[i] != NULL) {
445 lengths[i] = strlen(_items[i]);
446 // Include space for the separator char (or a NULL for the last item).
447 total_len += lengths[i] + 1;
448 }
449 }
450 assert(total_len > 0, "empty sysclasspath not allowed");
451
452 // Copy the _items to a single string.
453 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
454 char* cp_tmp = cp;
455 for (i = 0; i < _scp_nitems; ++i) {
456 if (_items[i] != NULL) {
457 memcpy(cp_tmp, _items[i], lengths[i]);
458 cp_tmp += lengths[i];
459 *cp_tmp++ = separator;
460 }
461 }
462 *--cp_tmp = '\0'; // Replace the extra separator.
463 return cp;
464 }
465
466 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
467 char*
468 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
469 char *cp;
470
471 assert(str != NULL, "just checking");
472 if (path == NULL) {
473 size_t len = strlen(str) + 1;
474 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
475 memcpy(cp, str, len); // copy the trailing null
476 } else {
477 const char separator = *os::path_separator();
478 size_t old_len = strlen(path);
479 size_t str_len = strlen(str);
480 size_t len = old_len + str_len + 2;
481
482 if (prepend) {
483 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
484 char* cp_tmp = cp;
485 memcpy(cp_tmp, str, str_len);
486 cp_tmp += str_len;
487 *cp_tmp = separator;
488 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
489 FREE_C_HEAP_ARRAY(char, path, mtInternal);
490 } else {
491 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
492 char* cp_tmp = cp + old_len;
493 *cp_tmp = separator;
494 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
495 }
496 }
497 return cp;
498 }
499
500 // Scan the directory and append any jar or zip files found to path.
501 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
502 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
503 DIR* dir = os::opendir(directory);
504 if (dir == NULL) return path;
505
506 char dir_sep[2] = { '\0', '\0' };
507 size_t directory_len = strlen(directory);
508 const char fileSep = *os::file_separator();
509 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
510
511 /* Scan the directory for jars/zips, appending them to path. */
512 struct dirent *entry;
513 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
514 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
515 const char* name = entry->d_name;
516 const char* ext = name + strlen(name) - 4;
517 bool isJarOrZip = ext > name &&
518 (os::file_name_strcmp(ext, ".jar") == 0 ||
519 os::file_name_strcmp(ext, ".zip") == 0);
520 if (isJarOrZip) {
521 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
522 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
523 path = add_to_path(path, jarpath, false);
524 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
525 }
526 }
527 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
528 os::closedir(dir);
529 return path;
530 }
531
532 // Parses a memory size specification string.
533 static bool atomull(const char *s, julong* result) {
534 julong n = 0;
535 int args_read = sscanf(s, os::julong_format_specifier(), &n);
536 if (args_read != 1) {
537 return false;
538 }
539 while (*s != '\0' && isdigit(*s)) {
540 s++;
541 }
542 // 4705540: illegal if more characters are found after the first non-digit
543 if (strlen(s) > 1) {
544 return false;
545 }
546 switch (*s) {
547 case 'T': case 't':
548 *result = n * G * K;
549 // Check for overflow.
550 if (*result/((julong)G * K) != n) return false;
551 return true;
552 case 'G': case 'g':
553 *result = n * G;
554 if (*result/G != n) return false;
555 return true;
556 case 'M': case 'm':
557 *result = n * M;
558 if (*result/M != n) return false;
559 return true;
560 case 'K': case 'k':
561 *result = n * K;
562 if (*result/K != n) return false;
563 return true;
564 case '\0':
565 *result = n;
566 return true;
567 default:
568 return false;
569 }
570 }
571
572 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
573 if (size < min_size) return arg_too_small;
574 // Check that size will fit in a size_t (only relevant on 32-bit)
575 if (size > max_uintx) return arg_too_big;
576 return arg_in_range;
577 }
578
579 // Describe an argument out of range error
580 void Arguments::describe_range_error(ArgsRange errcode) {
581 switch(errcode) {
582 case arg_too_big:
583 jio_fprintf(defaultStream::error_stream(),
584 "The specified size exceeds the maximum "
585 "representable size.\n");
586 break;
587 case arg_too_small:
588 case arg_unreadable:
589 case arg_in_range:
590 // do nothing for now
591 break;
592 default:
593 ShouldNotReachHere();
594 }
595 }
596
597 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
598 return CommandLineFlags::boolAtPut(name, &value, origin);
599 }
600
601 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
602 double v;
603 if (sscanf(value, "%lf", &v) != 1) {
604 return false;
605 }
606
607 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
608 return true;
609 }
610 return false;
611 }
612
613 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
614 julong v;
615 intx intx_v;
616 bool is_neg = false;
617 // Check the sign first since atomull() parses only unsigned values.
618 if (*value == '-') {
619 if (!CommandLineFlags::intxAt(name, &intx_v)) {
620 return false;
621 }
622 value++;
623 is_neg = true;
624 }
625 if (!atomull(value, &v)) {
626 return false;
627 }
628 intx_v = (intx) v;
629 if (is_neg) {
630 intx_v = -intx_v;
631 }
632 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
633 return true;
634 }
635 uintx uintx_v = (uintx) v;
636 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
637 return true;
638 }
639 uint64_t uint64_t_v = (uint64_t) v;
640 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
641 return true;
642 }
643 return false;
644 }
645
646 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
647 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
648 // Contract: CommandLineFlags always returns a pointer that needs freeing.
649 FREE_C_HEAP_ARRAY(char, value, mtInternal);
650 return true;
651 }
652
653 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
654 const char* old_value = "";
655 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
656 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
657 size_t new_len = strlen(new_value);
658 const char* value;
659 char* free_this_too = NULL;
660 if (old_len == 0) {
661 value = new_value;
662 } else if (new_len == 0) {
663 value = old_value;
664 } else {
665 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
666 // each new setting adds another LINE to the switch:
667 sprintf(buf, "%s\n%s", old_value, new_value);
668 value = buf;
669 free_this_too = buf;
670 }
671 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
672 // CommandLineFlags always returns a pointer that needs freeing.
673 FREE_C_HEAP_ARRAY(char, value, mtInternal);
674 if (free_this_too != NULL) {
675 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
676 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
677 }
678 return true;
679 }
680
681 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
682
683 // range of acceptable characters spelled out for portability reasons
684 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
685 #define BUFLEN 255
686 char name[BUFLEN+1];
687 char dummy;
688
689 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
690 return set_bool_flag(name, false, origin);
691 }
692 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
693 return set_bool_flag(name, true, origin);
694 }
695
696 char punct;
697 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
698 const char* value = strchr(arg, '=') + 1;
699 Flag* flag = Flag::find_flag(name, strlen(name));
700 if (flag != NULL && flag->is_ccstr()) {
701 if (flag->ccstr_accumulates()) {
702 return append_to_string_flag(name, value, origin);
703 } else {
704 if (value[0] == '\0') {
705 value = NULL;
706 }
707 return set_string_flag(name, value, origin);
708 }
709 }
710 }
711
712 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
713 const char* value = strchr(arg, '=') + 1;
714 // -XX:Foo:=xxx will reset the string flag to the given value.
715 if (value[0] == '\0') {
716 value = NULL;
717 }
718 return set_string_flag(name, value, origin);
719 }
720
721 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
722 #define SIGNED_NUMBER_RANGE "[-0123456789]"
723 #define NUMBER_RANGE "[0123456789]"
724 char value[BUFLEN + 1];
725 char value2[BUFLEN + 1];
726 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
727 // Looks like a floating-point number -- try again with more lenient format string
728 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
729 return set_fp_numeric_flag(name, value, origin);
730 }
731 }
732
733 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
734 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
735 return set_numeric_flag(name, value, origin);
736 }
737
738 return false;
739 }
740
741 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
742 assert(bldarray != NULL, "illegal argument");
743
744 if (arg == NULL) {
745 return;
746 }
747
748 int index = *count;
749
750 // expand the array and add arg to the last element
751 (*count)++;
752 if (*bldarray == NULL) {
753 *bldarray = NEW_C_HEAP_ARRAY(char*, *count, mtInternal);
754 } else {
755 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count, mtInternal);
756 }
757 (*bldarray)[index] = strdup(arg);
758 }
759
760 void Arguments::build_jvm_args(const char* arg) {
761 add_string(&_jvm_args_array, &_num_jvm_args, arg);
762 }
763
764 void Arguments::build_jvm_flags(const char* arg) {
765 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
766 }
767
768 // utility function to return a string that concatenates all
769 // strings in a given char** array
770 const char* Arguments::build_resource_string(char** args, int count) {
771 if (args == NULL || count == 0) {
772 return NULL;
773 }
774 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
775 for (int i = 1; i < count; i++) {
776 length += strlen(args[i]) + 1; // add 1 for a space
777 }
778 char* s = NEW_RESOURCE_ARRAY(char, length);
779 strcpy(s, args[0]);
780 for (int j = 1; j < count; j++) {
781 strcat(s, " ");
782 strcat(s, args[j]);
783 }
784 return (const char*) s;
785 }
786
787 void Arguments::print_on(outputStream* st) {
788 st->print_cr("VM Arguments:");
789 if (num_jvm_flags() > 0) {
790 st->print("jvm_flags: "); print_jvm_flags_on(st);
791 }
792 if (num_jvm_args() > 0) {
793 st->print("jvm_args: "); print_jvm_args_on(st);
794 }
795 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
796 if (_java_class_path != NULL) {
797 char* path = _java_class_path->value();
798 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
799 }
800 st->print_cr("Launcher Type: %s", _sun_java_launcher);
801 }
802
803 void Arguments::print_jvm_flags_on(outputStream* st) {
804 if (_num_jvm_flags > 0) {
805 for (int i=0; i < _num_jvm_flags; i++) {
806 st->print("%s ", _jvm_flags_array[i]);
807 }
808 st->print_cr("");
809 }
810 }
811
812 void Arguments::print_jvm_args_on(outputStream* st) {
813 if (_num_jvm_args > 0) {
814 for (int i=0; i < _num_jvm_args; i++) {
815 st->print("%s ", _jvm_args_array[i]);
816 }
817 st->print_cr("");
818 }
819 }
820
821 bool Arguments::process_argument(const char* arg,
822 jboolean ignore_unrecognized, FlagValueOrigin origin) {
823
824 JDK_Version since = JDK_Version();
825
826 if (parse_argument(arg, origin) || ignore_unrecognized) {
827 return true;
828 }
829
830 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg;
831 if (is_newly_obsolete(arg, &since)) {
832 char version[256];
833 since.to_string(version, sizeof(version));
834 warning("ignoring option %s; support was removed in %s", argname, version);
835 return true;
836 }
837
838 // For locked flags, report a custom error message if available.
839 // Otherwise, report the standard unrecognized VM option.
840
841 Flag* locked_flag = Flag::find_flag((char*)argname, strlen(argname), true);
842 if (locked_flag != NULL) {
843 char locked_message_buf[BUFLEN];
844 locked_flag->get_locked_message(locked_message_buf, BUFLEN);
845 if (strlen(locked_message_buf) == 0) {
846 jio_fprintf(defaultStream::error_stream(),
847 "Unrecognized VM option '%s'\n", argname);
848 } else {
849 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
850 }
851 } else {
852 jio_fprintf(defaultStream::error_stream(),
853 "Unrecognized VM option '%s'\n", argname);
854 }
855
856 // allow for commandline "commenting out" options like -XX:#+Verbose
857 return arg[0] == '#';
858 }
859
860 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
861 FILE* stream = fopen(file_name, "rb");
862 if (stream == NULL) {
863 if (should_exist) {
864 jio_fprintf(defaultStream::error_stream(),
865 "Could not open settings file %s\n", file_name);
866 return false;
867 } else {
868 return true;
869 }
870 }
871
872 char token[1024];
873 int pos = 0;
874
875 bool in_white_space = true;
876 bool in_comment = false;
877 bool in_quote = false;
878 char quote_c = 0;
879 bool result = true;
880
881 int c = getc(stream);
882 while(c != EOF && pos < (int)(sizeof(token)-1)) {
883 if (in_white_space) {
884 if (in_comment) {
885 if (c == '\n') in_comment = false;
886 } else {
887 if (c == '#') in_comment = true;
888 else if (!isspace(c)) {
889 in_white_space = false;
890 token[pos++] = c;
891 }
892 }
893 } else {
894 if (c == '\n' || (!in_quote && isspace(c))) {
895 // token ends at newline, or at unquoted whitespace
896 // this allows a way to include spaces in string-valued options
897 token[pos] = '\0';
898 logOption(token);
899 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
900 build_jvm_flags(token);
901 pos = 0;
902 in_white_space = true;
903 in_quote = false;
904 } else if (!in_quote && (c == '\'' || c == '"')) {
905 in_quote = true;
906 quote_c = c;
907 } else if (in_quote && (c == quote_c)) {
908 in_quote = false;
909 } else {
910 token[pos++] = c;
911 }
912 }
913 c = getc(stream);
914 }
915 if (pos > 0) {
916 token[pos] = '\0';
917 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
918 build_jvm_flags(token);
919 }
920 fclose(stream);
921 return result;
922 }
923
924 //=============================================================================================================
925 // Parsing of properties (-D)
926
927 const char* Arguments::get_property(const char* key) {
928 return PropertyList_get_value(system_properties(), key);
929 }
930
931 bool Arguments::add_property(const char* prop) {
932 const char* eq = strchr(prop, '=');
933 char* key;
934 // ns must be static--its address may be stored in a SystemProperty object.
935 const static char ns[1] = {0};
936 char* value = (char *)ns;
937
938 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
939 key = AllocateHeap(key_len + 1, mtInternal);
940 strncpy(key, prop, key_len);
941 key[key_len] = '\0';
942
943 if (eq != NULL) {
944 size_t value_len = strlen(prop) - key_len - 1;
945 value = AllocateHeap(value_len + 1, mtInternal);
946 strncpy(value, &prop[key_len + 1], value_len + 1);
947 }
948
949 if (strcmp(key, "java.compiler") == 0) {
950 process_java_compiler_argument(value);
951 FreeHeap(key);
952 if (eq != NULL) {
953 FreeHeap(value);
954 }
955 return true;
956 } else if (strcmp(key, "sun.java.command") == 0) {
957 _java_command = value;
958
959 // Record value in Arguments, but let it get passed to Java.
960 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
961 // launcher.pid property is private and is processed
962 // in process_sun_java_launcher_properties();
963 // the sun.java.launcher property is passed on to the java application
964 FreeHeap(key);
965 if (eq != NULL) {
966 FreeHeap(value);
967 }
968 return true;
969 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
970 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
971 // its value without going through the property list or making a Java call.
972 _java_vendor_url_bug = value;
973 } else if (strcmp(key, "sun.boot.library.path") == 0) {
974 PropertyList_unique_add(&_system_properties, key, value, true);
975 return true;
976 }
977 // Create new property and add at the end of the list
978 PropertyList_unique_add(&_system_properties, key, value);
979 return true;
980 }
981
982 //===========================================================================================================
983 // Setting int/mixed/comp mode flags
984
985 void Arguments::set_mode_flags(Mode mode) {
986 // Set up default values for all flags.
987 // If you add a flag to any of the branches below,
988 // add a default value for it here.
989 set_java_compiler(false);
990 _mode = mode;
991
992 // Ensure Agent_OnLoad has the correct initial values.
993 // This may not be the final mode; mode may change later in onload phase.
994 PropertyList_unique_add(&_system_properties, "java.vm.info",
995 (char*)VM_Version::vm_info_string(), false);
996
997 UseInterpreter = true;
998 UseCompiler = true;
999 UseLoopCounter = true;
1000
1001 #ifndef ZERO
1002 // Turn these off for mixed and comp. Leave them on for Zero.
1003 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1004 UseFastAccessorMethods = (mode == _int);
1005 }
1006 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1007 UseFastEmptyMethods = (mode == _int);
1008 }
1009 #endif
1010
1011 // Default values may be platform/compiler dependent -
1012 // use the saved values
1013 ClipInlining = Arguments::_ClipInlining;
1014 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1015 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1016 BackgroundCompilation = Arguments::_BackgroundCompilation;
1017
1018 // Change from defaults based on mode
1019 switch (mode) {
1020 default:
1021 ShouldNotReachHere();
1022 break;
1023 case _int:
1024 UseCompiler = false;
1025 UseLoopCounter = false;
1026 AlwaysCompileLoopMethods = false;
1027 UseOnStackReplacement = false;
1028 break;
1029 case _mixed:
1030 // same as default
1031 break;
1032 case _comp:
1033 UseInterpreter = false;
1034 BackgroundCompilation = false;
1035 ClipInlining = false;
1036 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1037 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1038 // compile a level 4 (C2) and then continue executing it.
1039 if (TieredCompilation) {
1040 Tier3InvokeNotifyFreqLog = 0;
1041 Tier4InvocationThreshold = 0;
1042 }
1043 break;
1044 }
1045 }
1046
1047 // Conflict: required to use shared spaces (-Xshare:on), but
1048 // incompatible command line options were chosen.
1049
1050 static void no_shared_spaces() {
1051 if (RequireSharedSpaces) {
1052 jio_fprintf(defaultStream::error_stream(),
1053 "Class data sharing is inconsistent with other specified options.\n");
1054 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1055 } else {
1056 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1057 }
1058 }
1059
1060 void Arguments::set_tiered_flags() {
1061 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1062 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1063 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1064 }
1065 if (CompilationPolicyChoice < 2) {
1066 vm_exit_during_initialization(
1067 "Incompatible compilation policy selected", NULL);
1068 }
1069 // Increase the code cache size - tiered compiles a lot more.
1070 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1071 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1072 }
1073 }
1074
1075 #if INCLUDE_ALTERNATE_GCS
1076 static void disable_adaptive_size_policy(const char* collector_name) {
1077 if (UseAdaptiveSizePolicy) {
1078 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1079 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1080 collector_name);
1081 }
1082 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1083 }
1084 }
1085
1086 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1087 // if it's not explictly set or unset. If the user has chosen
1088 // UseParNewGC and not explicitly set ParallelGCThreads we
1089 // set it, unless this is a single cpu machine.
1090 void Arguments::set_parnew_gc_flags() {
1091 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1092 "control point invariant");
1093 assert(UseParNewGC, "Error");
1094
1095 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1096 disable_adaptive_size_policy("UseParNewGC");
1097
1098 if (ParallelGCThreads == 0) {
1099 FLAG_SET_DEFAULT(ParallelGCThreads,
1100 Abstract_VM_Version::parallel_worker_threads());
1101 if (ParallelGCThreads == 1) {
1102 FLAG_SET_DEFAULT(UseParNewGC, false);
1103 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1104 }
1105 }
1106 if (UseParNewGC) {
1107 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1108 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1109 // we set them to 1024 and 1024.
1110 // See CR 6362902.
1111 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1112 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1113 }
1114 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1115 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1116 }
1117
1118 // AlwaysTenure flag should make ParNew promote all at first collection.
1119 // See CR 6362902.
1120 if (AlwaysTenure) {
1121 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1122 }
1123 // When using compressed oops, we use local overflow stacks,
1124 // rather than using a global overflow list chained through
1125 // the klass word of the object's pre-image.
1126 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1127 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1128 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1129 }
1130 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1131 }
1132 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1133 }
1134 }
1135
1136 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1137 // sparc/solaris for certain applications, but would gain from
1138 // further optimization and tuning efforts, and would almost
1139 // certainly gain from analysis of platform and environment.
1140 void Arguments::set_cms_and_parnew_gc_flags() {
1141 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1142 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1143
1144 // If we are using CMS, we prefer to UseParNewGC,
1145 // unless explicitly forbidden.
1146 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1147 FLAG_SET_ERGO(bool, UseParNewGC, true);
1148 }
1149
1150 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1151 disable_adaptive_size_policy("UseConcMarkSweepGC");
1152
1153 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1154 // as needed.
1155 if (UseParNewGC) {
1156 set_parnew_gc_flags();
1157 }
1158
1159 // MaxHeapSize is aligned down in collectorPolicy
1160 size_t max_heap = align_size_down(MaxHeapSize,
1161 CardTableRS::ct_max_alignment_constraint());
1162
1163 // Now make adjustments for CMS
1164 intx tenuring_default = (intx)6;
1165 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1166
1167 // Preferred young gen size for "short" pauses:
1168 // upper bound depends on # of threads and NewRatio.
1169 const uintx parallel_gc_threads =
1170 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1171 const size_t preferred_max_new_size_unaligned =
1172 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1173 size_t preferred_max_new_size =
1174 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1175
1176 // Unless explicitly requested otherwise, size young gen
1177 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1178
1179 // If either MaxNewSize or NewRatio is set on the command line,
1180 // assume the user is trying to set the size of the young gen.
1181 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1182
1183 // Set MaxNewSize to our calculated preferred_max_new_size unless
1184 // NewSize was set on the command line and it is larger than
1185 // preferred_max_new_size.
1186 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1187 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1188 } else {
1189 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1190 }
1191 if (PrintGCDetails && Verbose) {
1192 // Too early to use gclog_or_tty
1193 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1194 }
1195
1196 // Code along this path potentially sets NewSize and OldSize
1197
1198 assert(max_heap >= InitialHeapSize, "Error");
1199 assert(max_heap >= NewSize, "Error");
1200
1201 if (PrintGCDetails && Verbose) {
1202 // Too early to use gclog_or_tty
1203 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1204 " initial_heap_size: " SIZE_FORMAT
1205 " max_heap: " SIZE_FORMAT,
1206 min_heap_size(), InitialHeapSize, max_heap);
1207 }
1208 size_t min_new = preferred_max_new_size;
1209 if (FLAG_IS_CMDLINE(NewSize)) {
1210 min_new = NewSize;
1211 }
1212 if (max_heap > min_new && min_heap_size() > min_new) {
1213 // Unless explicitly requested otherwise, make young gen
1214 // at least min_new, and at most preferred_max_new_size.
1215 if (FLAG_IS_DEFAULT(NewSize)) {
1216 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1217 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1218 if (PrintGCDetails && Verbose) {
1219 // Too early to use gclog_or_tty
1220 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1221 }
1222 }
1223 // Unless explicitly requested otherwise, size old gen
1224 // so it's NewRatio x of NewSize.
1225 if (FLAG_IS_DEFAULT(OldSize)) {
1226 if (max_heap > NewSize) {
1227 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1228 if (PrintGCDetails && Verbose) {
1229 // Too early to use gclog_or_tty
1230 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1231 }
1232 }
1233 }
1234 }
1235 }
1236 // Unless explicitly requested otherwise, definitely
1237 // promote all objects surviving "tenuring_default" scavenges.
1238 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1239 FLAG_IS_DEFAULT(SurvivorRatio)) {
1240 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1241 }
1242 // If we decided above (or user explicitly requested)
1243 // `promote all' (via MaxTenuringThreshold := 0),
1244 // prefer minuscule survivor spaces so as not to waste
1245 // space for (non-existent) survivors
1246 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1247 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1248 }
1249 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1250 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1251 // This is done in order to make ParNew+CMS configuration to work
1252 // with YoungPLABSize and OldPLABSize options.
1253 // See CR 6362902.
1254 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1255 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1256 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1257 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1258 // the value (either from the command line or ergonomics) of
1259 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1260 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1261 } else {
1262 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1263 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1264 // we'll let it to take precedence.
1265 jio_fprintf(defaultStream::error_stream(),
1266 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1267 " options are specified for the CMS collector."
1268 " CMSParPromoteBlocksToClaim will take precedence.\n");
1269 }
1270 }
1271 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1272 // OldPLAB sizing manually turned off: Use a larger default setting,
1273 // unless it was manually specified. This is because a too-low value
1274 // will slow down scavenges.
1275 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1276 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1277 }
1278 }
1279 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1280 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1281 // If either of the static initialization defaults have changed, note this
1282 // modification.
1283 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1284 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1285 }
1286 if (PrintGCDetails && Verbose) {
1287 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1288 MarkStackSize / K, MarkStackSizeMax / K);
1289 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1290 }
1291 }
1292 #endif // INCLUDE_ALTERNATE_GCS
1293
1294 void set_object_alignment() {
1295 // Object alignment.
1296 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1297 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1298 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1299 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1300 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1301 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1302
1303 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1304 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1305
1306 // Oop encoding heap max
1307 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1308
1309 #if INCLUDE_ALTERNATE_GCS
1310 // Set CMS global values
1311 CompactibleFreeListSpace::set_cms_values();
1312 #endif // INCLUDE_ALTERNATE_GCS
1313 }
1314
1315 bool verify_object_alignment() {
1316 // Object alignment.
1317 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1318 jio_fprintf(defaultStream::error_stream(),
1319 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1320 (int)ObjectAlignmentInBytes);
1321 return false;
1322 }
1323 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1324 jio_fprintf(defaultStream::error_stream(),
1325 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1326 (int)ObjectAlignmentInBytes, BytesPerLong);
1327 return false;
1328 }
1329 // It does not make sense to have big object alignment
1330 // since a space lost due to alignment will be greater
1331 // then a saved space from compressed oops.
1332 if ((int)ObjectAlignmentInBytes > 256) {
1333 jio_fprintf(defaultStream::error_stream(),
1334 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1335 (int)ObjectAlignmentInBytes);
1336 return false;
1337 }
1338 // In case page size is very small.
1339 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1340 jio_fprintf(defaultStream::error_stream(),
1341 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1342 (int)ObjectAlignmentInBytes, os::vm_page_size());
1343 return false;
1344 }
1345 return true;
1346 }
1347
1348 inline uintx max_heap_for_compressed_oops() {
1349 // Avoid sign flip.
1350 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) {
1351 return 0;
1352 }
1353 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size());
1354 NOT_LP64(ShouldNotReachHere(); return 0);
1355 }
1356
1357 bool Arguments::should_auto_select_low_pause_collector() {
1358 if (UseAutoGCSelectPolicy &&
1359 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1360 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1361 if (PrintGCDetails) {
1362 // Cannot use gclog_or_tty yet.
1363 tty->print_cr("Automatic selection of the low pause collector"
1364 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1365 }
1366 return true;
1367 }
1368 return false;
1369 }
1370
1371 void Arguments::set_ergonomics_flags() {
1372
1373 if (os::is_server_class_machine()) {
1374 // If no other collector is requested explicitly,
1375 // let the VM select the collector based on
1376 // machine class and automatic selection policy.
1377 if (!UseSerialGC &&
1378 !UseConcMarkSweepGC &&
1379 !UseG1GC &&
1380 !UseParNewGC &&
1381 FLAG_IS_DEFAULT(UseParallelGC)) {
1382 if (should_auto_select_low_pause_collector()) {
1383 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1384 } else {
1385 FLAG_SET_ERGO(bool, UseParallelGC, true);
1386 }
1387 }
1388 // Shared spaces work fine with other GCs but causes bytecode rewriting
1389 // to be disabled, which hurts interpreter performance and decreases
1390 // server performance. On server class machines, keep the default
1391 // off unless it is asked for. Future work: either add bytecode rewriting
1392 // at link time, or rewrite bytecodes in non-shared methods.
1393 if (!DumpSharedSpaces && !RequireSharedSpaces) {
1394 no_shared_spaces();
1395 }
1396 }
1397
1398 #ifndef ZERO
1399 #ifdef _LP64
1400 // Check that UseCompressedOops can be set with the max heap size allocated
1401 // by ergonomics.
1402 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1403 #if !defined(COMPILER1) || defined(TIERED)
1404 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1405 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1406 }
1407 #endif
1408 #ifdef _WIN64
1409 if (UseLargePages && UseCompressedOops) {
1410 // Cannot allocate guard pages for implicit checks in indexed addressing
1411 // mode, when large pages are specified on windows.
1412 // This flag could be switched ON if narrow oop base address is set to 0,
1413 // see code in Universe::initialize_heap().
1414 Universe::set_narrow_oop_use_implicit_null_checks(false);
1415 }
1416 #endif // _WIN64
1417 } else {
1418 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1419 warning("Max heap size too large for Compressed Oops");
1420 FLAG_SET_DEFAULT(UseCompressedOops, false);
1421 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1422 }
1423 }
1424 // UseCompressedOops must be on for UseCompressedKlassPointers to be on.
1425 if (!UseCompressedOops) {
1426 if (UseCompressedKlassPointers) {
1427 warning("UseCompressedKlassPointers requires UseCompressedOops");
1428 }
1429 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1430 } else {
1431 // Turn on UseCompressedKlassPointers too
1432 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) {
1433 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true);
1434 }
1435 // Set the ClassMetaspaceSize to something that will not need to be
1436 // expanded, since it cannot be expanded.
1437 if (UseCompressedKlassPointers && FLAG_IS_DEFAULT(ClassMetaspaceSize)) {
1438 // 100,000 classes seems like a good size, so 100M assumes around 1K
1439 // per klass. The vtable and oopMap is embedded so we don't have a fixed
1440 // size per klass. Eventually, this will be parameterized because it
1441 // would also be useful to determine the optimal size of the
1442 // systemDictionary.
1443 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M);
1444 }
1445 }
1446 // Also checks that certain machines are slower with compressed oops
1447 // in vm_version initialization code.
1448 #endif // _LP64
1449 #endif // !ZERO
1450 }
1451
1452 void Arguments::set_parallel_gc_flags() {
1453 assert(UseParallelGC || UseParallelOldGC, "Error");
1454 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1455 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1456 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1457 }
1458 FLAG_SET_DEFAULT(UseParallelGC, true);
1459
1460 // If no heap maximum was requested explicitly, use some reasonable fraction
1461 // of the physical memory, up to a maximum of 1GB.
1462 if (UseParallelGC) {
1463 FLAG_SET_DEFAULT(ParallelGCThreads,
1464 Abstract_VM_Version::parallel_worker_threads());
1465
1466 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1467 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1468 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1469 // See CR 6362902 for details.
1470 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1471 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1472 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1473 }
1474 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1475 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1476 }
1477 }
1478
1479 if (UseParallelOldGC) {
1480 // Par compact uses lower default values since they are treated as
1481 // minimums. These are different defaults because of the different
1482 // interpretation and are not ergonomically set.
1483 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1484 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1485 }
1486 }
1487 }
1488 }
1489
1490 void Arguments::set_g1_gc_flags() {
1491 assert(UseG1GC, "Error");
1492 #ifdef COMPILER1
1493 FastTLABRefill = false;
1494 #endif
1495 FLAG_SET_DEFAULT(ParallelGCThreads,
1496 Abstract_VM_Version::parallel_worker_threads());
1497 if (ParallelGCThreads == 0) {
1498 FLAG_SET_DEFAULT(ParallelGCThreads,
1499 Abstract_VM_Version::parallel_worker_threads());
1500 }
1501
1502 // MarkStackSize will be set (if it hasn't been set by the user)
1503 // when concurrent marking is initialized.
1504 // Its value will be based upon the number of parallel marking threads.
1505 // But we do set the maximum mark stack size here.
1506 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1507 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1508 }
1509
1510 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1511 // In G1, we want the default GC overhead goal to be higher than
1512 // say in PS. So we set it here to 10%. Otherwise the heap might
1513 // be expanded more aggressively than we would like it to. In
1514 // fact, even 10% seems to not be high enough in some cases
1515 // (especially small GC stress tests that the main thing they do
1516 // is allocation). We might consider increase it further.
1517 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1518 }
1519
1520 if (PrintGCDetails && Verbose) {
1521 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1522 MarkStackSize / K, MarkStackSizeMax / K);
1523 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1524 }
1525 }
1526
1527 void Arguments::set_heap_size() {
1528 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1529 // Deprecated flag
1530 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1531 }
1532
1533 const julong phys_mem =
1534 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1535 : (julong)MaxRAM;
1536
1537 // If the maximum heap size has not been set with -Xmx,
1538 // then set it as fraction of the size of physical memory,
1539 // respecting the maximum and minimum sizes of the heap.
1540 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1541 julong reasonable_max = phys_mem / MaxRAMFraction;
1542
1543 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1544 // Small physical memory, so use a minimum fraction of it for the heap
1545 reasonable_max = phys_mem / MinRAMFraction;
1546 } else {
1547 // Not-small physical memory, so require a heap at least
1548 // as large as MaxHeapSize
1549 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1550 }
1551 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1552 // Limit the heap size to ErgoHeapSizeLimit
1553 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1554 }
1555 if (UseCompressedOops) {
1556 // Limit the heap size to the maximum possible when using compressed oops
1557 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1558 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1559 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1560 // but it should be not less than default MaxHeapSize.
1561 max_coop_heap -= HeapBaseMinAddress;
1562 }
1563 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1564 }
1565 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1566
1567 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1568 // An initial heap size was specified on the command line,
1569 // so be sure that the maximum size is consistent. Done
1570 // after call to allocatable_physical_memory because that
1571 // method might reduce the allocation size.
1572 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1573 }
1574
1575 if (PrintGCDetails && Verbose) {
1576 // Cannot use gclog_or_tty yet.
1577 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1578 }
1579 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1580 }
1581
1582 // If the initial_heap_size has not been set with InitialHeapSize
1583 // or -Xms, then set it as fraction of the size of physical memory,
1584 // respecting the maximum and minimum sizes of the heap.
1585 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1586 julong reasonable_minimum = (julong)(OldSize + NewSize);
1587
1588 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1589
1590 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1591
1592 julong reasonable_initial = phys_mem / InitialRAMFraction;
1593
1594 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1595 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1596
1597 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1598
1599 if (PrintGCDetails && Verbose) {
1600 // Cannot use gclog_or_tty yet.
1601 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1602 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1603 }
1604 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1605 set_min_heap_size((uintx)reasonable_minimum);
1606 }
1607 }
1608
1609 // This must be called after ergonomics because we want bytecode rewriting
1610 // if the server compiler is used, or if UseSharedSpaces is disabled.
1611 void Arguments::set_bytecode_flags() {
1612 // Better not attempt to store into a read-only space.
1613 if (UseSharedSpaces) {
1614 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1615 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1616 }
1617
1618 if (!RewriteBytecodes) {
1619 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1620 }
1621 }
1622
1623 // Aggressive optimization flags -XX:+AggressiveOpts
1624 void Arguments::set_aggressive_opts_flags() {
1625 #ifdef COMPILER2
1626 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1627 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1628 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1629 }
1630 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1631 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1632 }
1633
1634 // Feed the cache size setting into the JDK
1635 char buffer[1024];
1636 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1637 add_property(buffer);
1638 }
1639 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1640 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1641 }
1642 #endif
1643
1644 if (AggressiveOpts) {
1645 // Sample flag setting code
1646 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1647 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1648 // }
1649 }
1650 }
1651
1652 //===========================================================================================================
1653 // Parsing of java.compiler property
1654
1655 void Arguments::process_java_compiler_argument(char* arg) {
1656 // For backwards compatibility, Djava.compiler=NONE or ""
1657 // causes us to switch to -Xint mode UNLESS -Xdebug
1658 // is also specified.
1659 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1660 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1661 }
1662 }
1663
1664 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1665 _sun_java_launcher = strdup(launcher);
1666 if (strcmp("gamma", _sun_java_launcher) == 0) {
1667 _created_by_gamma_launcher = true;
1668 }
1669 }
1670
1671 bool Arguments::created_by_java_launcher() {
1672 assert(_sun_java_launcher != NULL, "property must have value");
1673 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1674 }
1675
1676 bool Arguments::created_by_gamma_launcher() {
1677 return _created_by_gamma_launcher;
1678 }
1679
1680 //===========================================================================================================
1681 // Parsing of main arguments
1682
1683 bool Arguments::verify_interval(uintx val, uintx min,
1684 uintx max, const char* name) {
1685 // Returns true iff value is in the inclusive interval [min..max]
1686 // false, otherwise.
1687 if (val >= min && val <= max) {
1688 return true;
1689 }
1690 jio_fprintf(defaultStream::error_stream(),
1691 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1692 " and " UINTX_FORMAT "\n",
1693 name, val, min, max);
1694 return false;
1695 }
1696
1697 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1698 // Returns true if given value is at least specified min threshold
1699 // false, otherwise.
1700 if (val >= min ) {
1701 return true;
1702 }
1703 jio_fprintf(defaultStream::error_stream(),
1704 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1705 name, val, min);
1706 return false;
1707 }
1708
1709 bool Arguments::verify_percentage(uintx value, const char* name) {
1710 if (value <= 100) {
1711 return true;
1712 }
1713 jio_fprintf(defaultStream::error_stream(),
1714 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1715 name, value);
1716 return false;
1717 }
1718
1719 static void force_serial_gc() {
1720 FLAG_SET_DEFAULT(UseSerialGC, true);
1721 FLAG_SET_DEFAULT(UseParNewGC, false);
1722 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1723 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1724 FLAG_SET_DEFAULT(UseParallelGC, false);
1725 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1726 FLAG_SET_DEFAULT(UseG1GC, false);
1727 }
1728
1729 static bool verify_serial_gc_flags() {
1730 return (UseSerialGC &&
1731 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1732 UseParallelGC || UseParallelOldGC));
1733 }
1734
1735 // check if do gclog rotation
1736 // +UseGCLogFileRotation is a must,
1737 // no gc log rotation when log file not supplied or
1738 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1739 void check_gclog_consistency() {
1740 if (UseGCLogFileRotation) {
1741 if ((Arguments::gc_log_filename() == NULL) ||
1742 (NumberOfGCLogFiles == 0) ||
1743 (GCLogFileSize == 0)) {
1744 jio_fprintf(defaultStream::output_stream(),
1745 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1746 "where num_of_file > 0 and num_of_size > 0\n"
1747 "GC log rotation is turned off\n");
1748 UseGCLogFileRotation = false;
1749 }
1750 }
1751
1752 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1753 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1754 jio_fprintf(defaultStream::output_stream(),
1755 "GCLogFileSize changed to minimum 8K\n");
1756 }
1757 }
1758
1759 // Check consistency of GC selection
1760 bool Arguments::check_gc_consistency() {
1761 check_gclog_consistency();
1762 bool status = true;
1763 // Ensure that the user has not selected conflicting sets
1764 // of collectors. [Note: this check is merely a user convenience;
1765 // collectors over-ride each other so that only a non-conflicting
1766 // set is selected; however what the user gets is not what they
1767 // may have expected from the combination they asked for. It's
1768 // better to reduce user confusion by not allowing them to
1769 // select conflicting combinations.
1770 uint i = 0;
1771 if (UseSerialGC) i++;
1772 if (UseConcMarkSweepGC || UseParNewGC) i++;
1773 if (UseParallelGC || UseParallelOldGC) i++;
1774 if (UseG1GC) i++;
1775 if (i > 1) {
1776 jio_fprintf(defaultStream::error_stream(),
1777 "Conflicting collector combinations in option list; "
1778 "please refer to the release notes for the combinations "
1779 "allowed\n");
1780 status = false;
1781 }
1782
1783 return status;
1784 }
1785
1786 void Arguments::check_deprecated_gcs() {
1787 if (UseConcMarkSweepGC && !UseParNewGC) {
1788 warning("Using the DefNew young collector with the CMS collector is deprecated "
1789 "and will likely be removed in a future release");
1790 }
1791
1792 if (UseParNewGC && !UseConcMarkSweepGC) {
1793 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1794 // set up UseSerialGC properly, so that can't be used in the check here.
1795 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1796 "and will likely be removed in a future release");
1797 }
1798 }
1799
1800 // Check stack pages settings
1801 bool Arguments::check_stack_pages()
1802 {
1803 bool status = true;
1804 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1805 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1806 // greater stack shadow pages can't generate instruction to bang stack
1807 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1808 return status;
1809 }
1810
1811 // Check the consistency of vm_init_args
1812 bool Arguments::check_vm_args_consistency() {
1813 // Method for adding checks for flag consistency.
1814 // The intent is to warn the user of all possible conflicts,
1815 // before returning an error.
1816 // Note: Needs platform-dependent factoring.
1817 bool status = true;
1818
1819 #if ( (defined(COMPILER2) && defined(SPARC)))
1820 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1821 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1822 // x86. Normally, VM_Version_init must be called from init_globals in
1823 // init.cpp, which is called by the initial java thread *after* arguments
1824 // have been parsed. VM_Version_init gets called twice on sparc.
1825 extern void VM_Version_init();
1826 VM_Version_init();
1827 if (!VM_Version::has_v9()) {
1828 jio_fprintf(defaultStream::error_stream(),
1829 "V8 Machine detected, Server requires V9\n");
1830 status = false;
1831 }
1832 #endif /* COMPILER2 && SPARC */
1833
1834 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1835 // builds so the cost of stack banging can be measured.
1836 #if (defined(PRODUCT) && defined(SOLARIS))
1837 if (!UseBoundThreads && !UseStackBanging) {
1838 jio_fprintf(defaultStream::error_stream(),
1839 "-UseStackBanging conflicts with -UseBoundThreads\n");
1840
1841 status = false;
1842 }
1843 #endif
1844
1845 if (TLABRefillWasteFraction == 0) {
1846 jio_fprintf(defaultStream::error_stream(),
1847 "TLABRefillWasteFraction should be a denominator, "
1848 "not " SIZE_FORMAT "\n",
1849 TLABRefillWasteFraction);
1850 status = false;
1851 }
1852
1853 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1854 "AdaptiveSizePolicyWeight");
1855 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1856 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1857 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1858
1859 // Divide by bucket size to prevent a large size from causing rollover when
1860 // calculating amount of memory needed to be allocated for the String table.
1861 status = status && verify_interval(StringTableSize, defaultStringTableSize,
1862 (max_uintx / StringTable::bucket_size()), "StringTable size");
1863
1864 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1865 jio_fprintf(defaultStream::error_stream(),
1866 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1867 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1868 MinHeapFreeRatio, MaxHeapFreeRatio);
1869 status = false;
1870 }
1871 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1872 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1873
1874 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1875 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1876 }
1877
1878 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1879 // Settings to encourage splitting.
1880 if (!FLAG_IS_CMDLINE(NewRatio)) {
1881 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1882 }
1883 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1884 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1885 }
1886 }
1887
1888 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1889 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1890 if (GCTimeLimit == 100) {
1891 // Turn off gc-overhead-limit-exceeded checks
1892 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1893 }
1894
1895 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1896
1897 status = status && check_gc_consistency();
1898 status = status && check_stack_pages();
1899
1900 if (_has_alloc_profile) {
1901 if (UseParallelGC || UseParallelOldGC) {
1902 jio_fprintf(defaultStream::error_stream(),
1903 "error: invalid argument combination.\n"
1904 "Allocation profiling (-Xaprof) cannot be used together with "
1905 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1906 status = false;
1907 }
1908 if (UseConcMarkSweepGC) {
1909 jio_fprintf(defaultStream::error_stream(),
1910 "error: invalid argument combination.\n"
1911 "Allocation profiling (-Xaprof) cannot be used together with "
1912 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1913 status = false;
1914 }
1915 }
1916
1917 if (CMSIncrementalMode) {
1918 if (!UseConcMarkSweepGC) {
1919 jio_fprintf(defaultStream::error_stream(),
1920 "error: invalid argument combination.\n"
1921 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1922 "selected in order\nto use CMSIncrementalMode.\n");
1923 status = false;
1924 } else {
1925 status = status && verify_percentage(CMSIncrementalDutyCycle,
1926 "CMSIncrementalDutyCycle");
1927 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1928 "CMSIncrementalDutyCycleMin");
1929 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1930 "CMSIncrementalSafetyFactor");
1931 status = status && verify_percentage(CMSIncrementalOffset,
1932 "CMSIncrementalOffset");
1933 status = status && verify_percentage(CMSExpAvgFactor,
1934 "CMSExpAvgFactor");
1935 // If it was not set on the command line, set
1936 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1937 if (CMSInitiatingOccupancyFraction < 0) {
1938 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1939 }
1940 }
1941 }
1942
1943 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1944 // insists that we hold the requisite locks so that the iteration is
1945 // MT-safe. For the verification at start-up and shut-down, we don't
1946 // yet have a good way of acquiring and releasing these locks,
1947 // which are not visible at the CollectedHeap level. We want to
1948 // be able to acquire these locks and then do the iteration rather
1949 // than just disable the lock verification. This will be fixed under
1950 // bug 4788986.
1951 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1952 if (VerifyGCStartAt == 0) {
1953 warning("Heap verification at start-up disabled "
1954 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1955 VerifyGCStartAt = 1; // Disable verification at start-up
1956 }
1957 if (VerifyBeforeExit) {
1958 warning("Heap verification at shutdown disabled "
1959 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1960 VerifyBeforeExit = false; // Disable verification at shutdown
1961 }
1962 }
1963
1964 // Note: only executed in non-PRODUCT mode
1965 if (!UseAsyncConcMarkSweepGC &&
1966 (ExplicitGCInvokesConcurrent ||
1967 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1968 jio_fprintf(defaultStream::error_stream(),
1969 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1970 " with -UseAsyncConcMarkSweepGC");
1971 status = false;
1972 }
1973
1974 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
1975
1976 #ifndef SERIALGC
1977 if (UseG1GC) {
1978 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1979 "InitiatingHeapOccupancyPercent");
1980 status = status && verify_min_value(G1RefProcDrainInterval, 1,
1981 "G1RefProcDrainInterval");
1982 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
1983 "G1ConcMarkStepDurationMillis");
1984 }
1985 #endif
1986
1987 status = status && verify_interval(RefDiscoveryPolicy,
1988 ReferenceProcessor::DiscoveryPolicyMin,
1989 ReferenceProcessor::DiscoveryPolicyMax,
1990 "RefDiscoveryPolicy");
1991
1992 // Limit the lower bound of this flag to 1 as it is used in a division
1993 // expression.
1994 status = status && verify_interval(TLABWasteTargetPercent,
1995 1, 100, "TLABWasteTargetPercent");
1996
1997 status = status && verify_object_alignment();
1998
1999 status = status && verify_min_value(ClassMetaspaceSize, 1*M,
2000 "ClassMetaspaceSize");
2001
2002 status = status && verify_interval(MarkStackSizeMax,
2003 1, (max_jint - 1), "MarkStackSizeMax");
2004
2005 #ifdef SPARC
2006 if (UseConcMarkSweepGC || UseG1GC) {
2007 // Issue a stern warning if the user has explicitly set
2008 // UseMemSetInBOT (it is known to cause issues), but allow
2009 // use for experimentation and debugging.
2010 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2011 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2012 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2013 " on sun4v; please understand that you are using at your own risk!");
2014 }
2015 }
2016 #endif // SPARC
2017
2018 if (PrintNMTStatistics) {
2019 #if INCLUDE_NMT
2020 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2021 #endif // INCLUDE_NMT
2022 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2023 PrintNMTStatistics = false;
2024 #if INCLUDE_NMT
2025 }
2026 #endif
2027 }
2028
2029 return status;
2030 }
2031
2032 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2033 const char* option_type) {
2034 if (ignore) return false;
2035
2036 const char* spacer = " ";
2037 if (option_type == NULL) {
2038 option_type = ++spacer; // Set both to the empty string.
2039 }
2040
2041 if (os::obsolete_option(option)) {
2042 jio_fprintf(defaultStream::error_stream(),
2043 "Obsolete %s%soption: %s\n", option_type, spacer,
2044 option->optionString);
2045 return false;
2046 } else {
2047 jio_fprintf(defaultStream::error_stream(),
2048 "Unrecognized %s%soption: %s\n", option_type, spacer,
2049 option->optionString);
2050 return true;
2051 }
2052 }
2053
2054 static const char* user_assertion_options[] = {
2055 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2056 };
2057
2058 static const char* system_assertion_options[] = {
2059 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2060 };
2061
2062 // Return true if any of the strings in null-terminated array 'names' matches.
2063 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2064 // the option must match exactly.
2065 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2066 bool tail_allowed) {
2067 for (/* empty */; *names != NULL; ++names) {
2068 if (match_option(option, *names, tail)) {
2069 if (**tail == '\0' || tail_allowed && **tail == ':') {
2070 return true;
2071 }
2072 }
2073 }
2074 return false;
2075 }
2076
2077 bool Arguments::parse_uintx(const char* value,
2078 uintx* uintx_arg,
2079 uintx min_size) {
2080
2081 // Check the sign first since atomull() parses only unsigned values.
2082 bool value_is_positive = !(*value == '-');
2083
2084 if (value_is_positive) {
2085 julong n;
2086 bool good_return = atomull(value, &n);
2087 if (good_return) {
2088 bool above_minimum = n >= min_size;
2089 bool value_is_too_large = n > max_uintx;
2090
2091 if (above_minimum && !value_is_too_large) {
2092 *uintx_arg = n;
2093 return true;
2094 }
2095 }
2096 }
2097 return false;
2098 }
2099
2100 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2101 julong* long_arg,
2102 julong min_size) {
2103 if (!atomull(s, long_arg)) return arg_unreadable;
2104 return check_memory_size(*long_arg, min_size);
2105 }
2106
2107 // Parse JavaVMInitArgs structure
2108
2109 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2110 // For components of the system classpath.
2111 SysClassPath scp(Arguments::get_sysclasspath());
2112 bool scp_assembly_required = false;
2113
2114 // Save default settings for some mode flags
2115 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2116 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2117 Arguments::_ClipInlining = ClipInlining;
2118 Arguments::_BackgroundCompilation = BackgroundCompilation;
2119
2120 // Setup flags for mixed which is the default
2121 set_mode_flags(_mixed);
2122
2123 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2124 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2125 if (result != JNI_OK) {
2126 return result;
2127 }
2128
2129 // Parse JavaVMInitArgs structure passed in
2130 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2131 if (result != JNI_OK) {
2132 return result;
2133 }
2134
2135 if (AggressiveOpts) {
2136 // Insert alt-rt.jar between user-specified bootclasspath
2137 // prefix and the default bootclasspath. os::set_boot_path()
2138 // uses meta_index_dir as the default bootclasspath directory.
2139 const char* altclasses_jar = "alt-rt.jar";
2140 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2141 strlen(altclasses_jar);
2142 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2143 strcpy(altclasses_path, get_meta_index_dir());
2144 strcat(altclasses_path, altclasses_jar);
2145 scp.add_suffix_to_prefix(altclasses_path);
2146 scp_assembly_required = true;
2147 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2148 }
2149
2150 if (WhiteBoxAPI) {
2151 // Append wb.jar to bootclasspath if enabled
2152 const char* wb_jar = "wb.jar";
2153 size_t wb_path_len = strlen(get_meta_index_dir()) + 1 +
2154 strlen(wb_jar);
2155 char* wb_path = NEW_C_HEAP_ARRAY(char, wb_path_len, mtInternal);
2156 strcpy(wb_path, get_meta_index_dir());
2157 strcat(wb_path, wb_jar);
2158 scp.add_suffix(wb_path);
2159 scp_assembly_required = true;
2160 FREE_C_HEAP_ARRAY(char, wb_path, mtInternal);
2161 }
2162
2163 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2164 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2165 if (result != JNI_OK) {
2166 return result;
2167 }
2168
2169 // Do final processing now that all arguments have been parsed
2170 result = finalize_vm_init_args(&scp, scp_assembly_required);
2171 if (result != JNI_OK) {
2172 return result;
2173 }
2174
2175 return JNI_OK;
2176 }
2177
2178 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2179 SysClassPath* scp_p,
2180 bool* scp_assembly_required_p,
2181 FlagValueOrigin origin) {
2182 // Remaining part of option string
2183 const char* tail;
2184
2185 // iterate over arguments
2186 for (int index = 0; index < args->nOptions; index++) {
2187 bool is_absolute_path = false; // for -agentpath vs -agentlib
2188
2189 const JavaVMOption* option = args->options + index;
2190
2191 if (!match_option(option, "-Djava.class.path", &tail) &&
2192 !match_option(option, "-Dsun.java.command", &tail) &&
2193 !match_option(option, "-Dsun.java.launcher", &tail)) {
2194
2195 // add all jvm options to the jvm_args string. This string
2196 // is used later to set the java.vm.args PerfData string constant.
2197 // the -Djava.class.path and the -Dsun.java.command options are
2198 // omitted from jvm_args string as each have their own PerfData
2199 // string constant object.
2200 build_jvm_args(option->optionString);
2201 }
2202
2203 // -verbose:[class/gc/jni]
2204 if (match_option(option, "-verbose", &tail)) {
2205 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2206 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2207 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2208 } else if (!strcmp(tail, ":gc")) {
2209 FLAG_SET_CMDLINE(bool, PrintGC, true);
2210 } else if (!strcmp(tail, ":jni")) {
2211 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2212 }
2213 // -da / -ea / -disableassertions / -enableassertions
2214 // These accept an optional class/package name separated by a colon, e.g.,
2215 // -da:java.lang.Thread.
2216 } else if (match_option(option, user_assertion_options, &tail, true)) {
2217 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2218 if (*tail == '\0') {
2219 JavaAssertions::setUserClassDefault(enable);
2220 } else {
2221 assert(*tail == ':', "bogus match by match_option()");
2222 JavaAssertions::addOption(tail + 1, enable);
2223 }
2224 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2225 } else if (match_option(option, system_assertion_options, &tail, false)) {
2226 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2227 JavaAssertions::setSystemClassDefault(enable);
2228 // -bootclasspath:
2229 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2230 scp_p->reset_path(tail);
2231 *scp_assembly_required_p = true;
2232 // -bootclasspath/a:
2233 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2234 scp_p->add_suffix(tail);
2235 *scp_assembly_required_p = true;
2236 // -bootclasspath/p:
2237 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2238 scp_p->add_prefix(tail);
2239 *scp_assembly_required_p = true;
2240 // -Xrun
2241 } else if (match_option(option, "-Xrun", &tail)) {
2242 if (tail != NULL) {
2243 const char* pos = strchr(tail, ':');
2244 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2245 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2246 name[len] = '\0';
2247
2248 char *options = NULL;
2249 if(pos != NULL) {
2250 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2251 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2252 }
2253 #if !INCLUDE_JVMTI
2254 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2255 warning("profiling and debugging agents are not supported in this VM");
2256 } else
2257 #endif // !INCLUDE_JVMTI
2258 add_init_library(name, options);
2259 }
2260 // -agentlib and -agentpath
2261 } else if (match_option(option, "-agentlib:", &tail) ||
2262 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2263 if(tail != NULL) {
2264 const char* pos = strchr(tail, '=');
2265 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2266 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2267 name[len] = '\0';
2268
2269 char *options = NULL;
2270 if(pos != NULL) {
2271 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2272 }
2273 #if !INCLUDE_JVMTI
2274 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2275 warning("profiling and debugging agents are not supported in this VM");
2276 } else
2277 #endif // !INCLUDE_JVMTI
2278 add_init_agent(name, options, is_absolute_path);
2279
2280 }
2281 // -javaagent
2282 } else if (match_option(option, "-javaagent:", &tail)) {
2283 #if !INCLUDE_JVMTI
2284 warning("Instrumentation agents are not supported in this VM");
2285 #else
2286 if(tail != NULL) {
2287 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2288 add_init_agent("instrument", options, false);
2289 }
2290 #endif // !INCLUDE_JVMTI
2291 // -Xnoclassgc
2292 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2293 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2294 // -Xincgc: i-CMS
2295 } else if (match_option(option, "-Xincgc", &tail)) {
2296 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2297 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2298 // -Xnoincgc: no i-CMS
2299 } else if (match_option(option, "-Xnoincgc", &tail)) {
2300 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2301 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2302 // -Xconcgc
2303 } else if (match_option(option, "-Xconcgc", &tail)) {
2304 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2305 // -Xnoconcgc
2306 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2307 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2308 // -Xbatch
2309 } else if (match_option(option, "-Xbatch", &tail)) {
2310 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2311 // -Xmn for compatibility with other JVM vendors
2312 } else if (match_option(option, "-Xmn", &tail)) {
2313 julong long_initial_eden_size = 0;
2314 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2315 if (errcode != arg_in_range) {
2316 jio_fprintf(defaultStream::error_stream(),
2317 "Invalid initial eden size: %s\n", option->optionString);
2318 describe_range_error(errcode);
2319 return JNI_EINVAL;
2320 }
2321 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2322 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2323 // -Xms
2324 } else if (match_option(option, "-Xms", &tail)) {
2325 julong long_initial_heap_size = 0;
2326 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2327 if (errcode != arg_in_range) {
2328 jio_fprintf(defaultStream::error_stream(),
2329 "Invalid initial heap size: %s\n", option->optionString);
2330 describe_range_error(errcode);
2331 return JNI_EINVAL;
2332 }
2333 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2334 // Currently the minimum size and the initial heap sizes are the same.
2335 set_min_heap_size(InitialHeapSize);
2336 // -Xmx
2337 } else if (match_option(option, "-Xmx", &tail)) {
2338 julong long_max_heap_size = 0;
2339 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2340 if (errcode != arg_in_range) {
2341 jio_fprintf(defaultStream::error_stream(),
2342 "Invalid maximum heap size: %s\n", option->optionString);
2343 describe_range_error(errcode);
2344 return JNI_EINVAL;
2345 }
2346 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2347 // Xmaxf
2348 } else if (match_option(option, "-Xmaxf", &tail)) {
2349 int maxf = (int)(atof(tail) * 100);
2350 if (maxf < 0 || maxf > 100) {
2351 jio_fprintf(defaultStream::error_stream(),
2352 "Bad max heap free percentage size: %s\n",
2353 option->optionString);
2354 return JNI_EINVAL;
2355 } else {
2356 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2357 }
2358 // Xminf
2359 } else if (match_option(option, "-Xminf", &tail)) {
2360 int minf = (int)(atof(tail) * 100);
2361 if (minf < 0 || minf > 100) {
2362 jio_fprintf(defaultStream::error_stream(),
2363 "Bad min heap free percentage size: %s\n",
2364 option->optionString);
2365 return JNI_EINVAL;
2366 } else {
2367 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2368 }
2369 // -Xss
2370 } else if (match_option(option, "-Xss", &tail)) {
2371 julong long_ThreadStackSize = 0;
2372 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2373 if (errcode != arg_in_range) {
2374 jio_fprintf(defaultStream::error_stream(),
2375 "Invalid thread stack size: %s\n", option->optionString);
2376 describe_range_error(errcode);
2377 return JNI_EINVAL;
2378 }
2379 // Internally track ThreadStackSize in units of 1024 bytes.
2380 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2381 round_to((int)long_ThreadStackSize, K) / K);
2382 // -Xoss
2383 } else if (match_option(option, "-Xoss", &tail)) {
2384 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2385 // -Xmaxjitcodesize
2386 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2387 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2388 julong long_ReservedCodeCacheSize = 0;
2389 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2390 (size_t)InitialCodeCacheSize);
2391 if (errcode != arg_in_range) {
2392 jio_fprintf(defaultStream::error_stream(),
2393 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2394 option->optionString, InitialCodeCacheSize/K);
2395 describe_range_error(errcode);
2396 return JNI_EINVAL;
2397 }
2398 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2399 // -green
2400 } else if (match_option(option, "-green", &tail)) {
2401 jio_fprintf(defaultStream::error_stream(),
2402 "Green threads support not available\n");
2403 return JNI_EINVAL;
2404 // -native
2405 } else if (match_option(option, "-native", &tail)) {
2406 // HotSpot always uses native threads, ignore silently for compatibility
2407 // -Xsqnopause
2408 } else if (match_option(option, "-Xsqnopause", &tail)) {
2409 // EVM option, ignore silently for compatibility
2410 // -Xrs
2411 } else if (match_option(option, "-Xrs", &tail)) {
2412 // Classic/EVM option, new functionality
2413 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2414 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2415 // change default internal VM signals used - lower case for back compat
2416 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2417 // -Xoptimize
2418 } else if (match_option(option, "-Xoptimize", &tail)) {
2419 // EVM option, ignore silently for compatibility
2420 // -Xprof
2421 } else if (match_option(option, "-Xprof", &tail)) {
2422 #if INCLUDE_FPROF
2423 _has_profile = true;
2424 #else // INCLUDE_FPROF
2425 // do we have to exit?
2426 warning("Flat profiling is not supported in this VM.");
2427 #endif // INCLUDE_FPROF
2428 // -Xaprof
2429 } else if (match_option(option, "-Xaprof", &tail)) {
2430 _has_alloc_profile = true;
2431 // -Xconcurrentio
2432 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2433 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2434 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2435 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2436 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2437 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2438
2439 // -Xinternalversion
2440 } else if (match_option(option, "-Xinternalversion", &tail)) {
2441 jio_fprintf(defaultStream::output_stream(), "%s\n",
2442 VM_Version::internal_vm_info_string());
2443 vm_exit(0);
2444 #ifndef PRODUCT
2445 // -Xprintflags
2446 } else if (match_option(option, "-Xprintflags", &tail)) {
2447 CommandLineFlags::printFlags(tty, false);
2448 vm_exit(0);
2449 #endif
2450 // -D
2451 } else if (match_option(option, "-D", &tail)) {
2452 if (!add_property(tail)) {
2453 return JNI_ENOMEM;
2454 }
2455 // Out of the box management support
2456 if (match_option(option, "-Dcom.sun.management", &tail)) {
2457 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2458 }
2459 // -Xint
2460 } else if (match_option(option, "-Xint", &tail)) {
2461 set_mode_flags(_int);
2462 // -Xmixed
2463 } else if (match_option(option, "-Xmixed", &tail)) {
2464 set_mode_flags(_mixed);
2465 // -Xcomp
2466 } else if (match_option(option, "-Xcomp", &tail)) {
2467 // for testing the compiler; turn off all flags that inhibit compilation
2468 set_mode_flags(_comp);
2469
2470 // -Xshare:dump
2471 } else if (match_option(option, "-Xshare:dump", &tail)) {
2472 #if defined(KERNEL)
2473 vm_exit_during_initialization(
2474 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2475 #elif !INCLUDE_CDS
2476 vm_exit_during_initialization(
2477 "Dumping a shared archive is not supported in this VM.", NULL);
2478 #else
2479 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2480 set_mode_flags(_int); // Prevent compilation, which creates objects
2481 #endif
2482 // -Xshare:on
2483 } else if (match_option(option, "-Xshare:on", &tail)) {
2484 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2485 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2486 // -Xshare:auto
2487 } else if (match_option(option, "-Xshare:auto", &tail)) {
2488 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2489 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2490 // -Xshare:off
2491 } else if (match_option(option, "-Xshare:off", &tail)) {
2492 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2493 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2494
2495 // -Xverify
2496 } else if (match_option(option, "-Xverify", &tail)) {
2497 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2498 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2499 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2500 } else if (strcmp(tail, ":remote") == 0) {
2501 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2502 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2503 } else if (strcmp(tail, ":none") == 0) {
2504 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2505 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2506 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2507 return JNI_EINVAL;
2508 }
2509 // -Xdebug
2510 } else if (match_option(option, "-Xdebug", &tail)) {
2511 // note this flag has been used, then ignore
2512 set_xdebug_mode(true);
2513 // -Xnoagent
2514 } else if (match_option(option, "-Xnoagent", &tail)) {
2515 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2516 } else if (match_option(option, "-Xboundthreads", &tail)) {
2517 // Bind user level threads to kernel threads (Solaris only)
2518 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2519 } else if (match_option(option, "-Xloggc:", &tail)) {
2520 // Redirect GC output to the file. -Xloggc:<filename>
2521 // ostream_init_log(), when called will use this filename
2522 // to initialize a fileStream.
2523 _gc_log_filename = strdup(tail);
2524 FLAG_SET_CMDLINE(bool, PrintGC, true);
2525 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2526
2527 // JNI hooks
2528 } else if (match_option(option, "-Xcheck", &tail)) {
2529 if (!strcmp(tail, ":jni")) {
2530 #if !INCLUDE_JNI_CHECK
2531 warning("JNI CHECKING is not supported in this VM");
2532 #else
2533 CheckJNICalls = true;
2534 #endif // INCLUDE_JNI_CHECK
2535 } else if (is_bad_option(option, args->ignoreUnrecognized,
2536 "check")) {
2537 return JNI_EINVAL;
2538 }
2539 } else if (match_option(option, "vfprintf", &tail)) {
2540 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2541 } else if (match_option(option, "exit", &tail)) {
2542 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2543 } else if (match_option(option, "abort", &tail)) {
2544 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2545 // -XX:+AggressiveHeap
2546 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2547
2548 // This option inspects the machine and attempts to set various
2549 // parameters to be optimal for long-running, memory allocation
2550 // intensive jobs. It is intended for machines with large
2551 // amounts of cpu and memory.
2552
2553 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2554 // VM, but we may not be able to represent the total physical memory
2555 // available (like having 8gb of memory on a box but using a 32bit VM).
2556 // Thus, we need to make sure we're using a julong for intermediate
2557 // calculations.
2558 julong initHeapSize;
2559 julong total_memory = os::physical_memory();
2560
2561 if (total_memory < (julong)256*M) {
2562 jio_fprintf(defaultStream::error_stream(),
2563 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2564 vm_exit(1);
2565 }
2566
2567 // The heap size is half of available memory, or (at most)
2568 // all of possible memory less 160mb (leaving room for the OS
2569 // when using ISM). This is the maximum; because adaptive sizing
2570 // is turned on below, the actual space used may be smaller.
2571
2572 initHeapSize = MIN2(total_memory / (julong)2,
2573 total_memory - (julong)160*M);
2574
2575 // Make sure that if we have a lot of memory we cap the 32 bit
2576 // process space. The 64bit VM version of this function is a nop.
2577 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2578
2579 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2580 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2581 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2582 // Currently the minimum size and the initial heap sizes are the same.
2583 set_min_heap_size(initHeapSize);
2584 }
2585 if (FLAG_IS_DEFAULT(NewSize)) {
2586 // Make the young generation 3/8ths of the total heap.
2587 FLAG_SET_CMDLINE(uintx, NewSize,
2588 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2589 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2590 }
2591
2592 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2593 FLAG_SET_DEFAULT(UseLargePages, true);
2594 #endif
2595
2596 // Increase some data structure sizes for efficiency
2597 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2598 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2599 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2600
2601 // See the OldPLABSize comment below, but replace 'after promotion'
2602 // with 'after copying'. YoungPLABSize is the size of the survivor
2603 // space per-gc-thread buffers. The default is 4kw.
2604 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2605
2606 // OldPLABSize is the size of the buffers in the old gen that
2607 // UseParallelGC uses to promote live data that doesn't fit in the
2608 // survivor spaces. At any given time, there's one for each gc thread.
2609 // The default size is 1kw. These buffers are rarely used, since the
2610 // survivor spaces are usually big enough. For specjbb, however, there
2611 // are occasions when there's lots of live data in the young gen
2612 // and we end up promoting some of it. We don't have a definite
2613 // explanation for why bumping OldPLABSize helps, but the theory
2614 // is that a bigger PLAB results in retaining something like the
2615 // original allocation order after promotion, which improves mutator
2616 // locality. A minor effect may be that larger PLABs reduce the
2617 // number of PLAB allocation events during gc. The value of 8kw
2618 // was arrived at by experimenting with specjbb.
2619 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2620
2621 // Enable parallel GC and adaptive generation sizing
2622 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2623 FLAG_SET_DEFAULT(ParallelGCThreads,
2624 Abstract_VM_Version::parallel_worker_threads());
2625
2626 // Encourage steady state memory management
2627 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2628
2629 // This appears to improve mutator locality
2630 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2631
2632 // Get around early Solaris scheduling bug
2633 // (affinity vs other jobs on system)
2634 // but disallow DR and offlining (5008695).
2635 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2636
2637 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2638 // The last option must always win.
2639 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2640 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2641 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2642 // The last option must always win.
2643 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2644 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2645 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2646 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2647 jio_fprintf(defaultStream::error_stream(),
2648 "Please use CMSClassUnloadingEnabled in place of "
2649 "CMSPermGenSweepingEnabled in the future\n");
2650 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2651 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2652 jio_fprintf(defaultStream::error_stream(),
2653 "Please use -XX:+UseGCOverheadLimit in place of "
2654 "-XX:+UseGCTimeLimit in the future\n");
2655 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2656 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2657 jio_fprintf(defaultStream::error_stream(),
2658 "Please use -XX:-UseGCOverheadLimit in place of "
2659 "-XX:-UseGCTimeLimit in the future\n");
2660 // The TLE options are for compatibility with 1.3 and will be
2661 // removed without notice in a future release. These options
2662 // are not to be documented.
2663 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2664 // No longer used.
2665 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2666 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2667 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2668 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2669 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2670 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2671 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2672 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2673 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2674 // No longer used.
2675 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2676 julong long_tlab_size = 0;
2677 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2678 if (errcode != arg_in_range) {
2679 jio_fprintf(defaultStream::error_stream(),
2680 "Invalid TLAB size: %s\n", option->optionString);
2681 describe_range_error(errcode);
2682 return JNI_EINVAL;
2683 }
2684 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2685 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2686 // No longer used.
2687 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2688 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2689 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2690 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2691 SOLARIS_ONLY(
2692 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2693 warning("-XX:+UsePermISM is obsolete.");
2694 FLAG_SET_CMDLINE(bool, UseISM, true);
2695 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2696 FLAG_SET_CMDLINE(bool, UseISM, false);
2697 )
2698 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2699 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2700 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2701 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2702 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2703 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2704 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2705 #if defined(DTRACE_ENABLED)
2706 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2707 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2708 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2709 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2710 #else // defined(DTRACE_ENABLED)
2711 jio_fprintf(defaultStream::error_stream(),
2712 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2713 return JNI_EINVAL;
2714 #endif // defined(DTRACE_ENABLED)
2715 #ifdef ASSERT
2716 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2717 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2718 // disable scavenge before parallel mark-compact
2719 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2720 #endif
2721 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2722 julong cms_blocks_to_claim = (julong)atol(tail);
2723 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2724 jio_fprintf(defaultStream::error_stream(),
2725 "Please use -XX:OldPLABSize in place of "
2726 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2727 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2728 julong cms_blocks_to_claim = (julong)atol(tail);
2729 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2730 jio_fprintf(defaultStream::error_stream(),
2731 "Please use -XX:OldPLABSize in place of "
2732 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2733 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2734 julong old_plab_size = 0;
2735 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2736 if (errcode != arg_in_range) {
2737 jio_fprintf(defaultStream::error_stream(),
2738 "Invalid old PLAB size: %s\n", option->optionString);
2739 describe_range_error(errcode);
2740 return JNI_EINVAL;
2741 }
2742 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2743 jio_fprintf(defaultStream::error_stream(),
2744 "Please use -XX:OldPLABSize in place of "
2745 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2746 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2747 julong young_plab_size = 0;
2748 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2749 if (errcode != arg_in_range) {
2750 jio_fprintf(defaultStream::error_stream(),
2751 "Invalid young PLAB size: %s\n", option->optionString);
2752 describe_range_error(errcode);
2753 return JNI_EINVAL;
2754 }
2755 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2756 jio_fprintf(defaultStream::error_stream(),
2757 "Please use -XX:YoungPLABSize in place of "
2758 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2759 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2760 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2761 julong stack_size = 0;
2762 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2763 if (errcode != arg_in_range) {
2764 jio_fprintf(defaultStream::error_stream(),
2765 "Invalid mark stack size: %s\n", option->optionString);
2766 describe_range_error(errcode);
2767 return JNI_EINVAL;
2768 }
2769 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2770 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2771 julong max_stack_size = 0;
2772 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2773 if (errcode != arg_in_range) {
2774 jio_fprintf(defaultStream::error_stream(),
2775 "Invalid maximum mark stack size: %s\n",
2776 option->optionString);
2777 describe_range_error(errcode);
2778 return JNI_EINVAL;
2779 }
2780 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2781 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2782 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2783 uintx conc_threads = 0;
2784 if (!parse_uintx(tail, &conc_threads, 1)) {
2785 jio_fprintf(defaultStream::error_stream(),
2786 "Invalid concurrent threads: %s\n", option->optionString);
2787 return JNI_EINVAL;
2788 }
2789 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2790 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
2791 julong max_direct_memory_size = 0;
2792 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
2793 if (errcode != arg_in_range) {
2794 jio_fprintf(defaultStream::error_stream(),
2795 "Invalid maximum direct memory size: %s\n",
2796 option->optionString);
2797 describe_range_error(errcode);
2798 return JNI_EINVAL;
2799 }
2800 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
2801 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
2802 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
2803 // away and will cause VM initialization failures!
2804 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
2805 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
2806 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2807 // Skip -XX:Flags= since that case has already been handled
2808 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2809 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2810 return JNI_EINVAL;
2811 }
2812 }
2813 // Unknown option
2814 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2815 return JNI_ERR;
2816 }
2817 }
2818
2819 // Change the default value for flags which have different default values
2820 // when working with older JDKs.
2821 #ifdef LINUX
2822 if (JDK_Version::current().compare_major(6) <= 0 &&
2823 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2824 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2825 }
2826 #endif // LINUX
2827 return JNI_OK;
2828 }
2829
2830 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2831 // This must be done after all -D arguments have been processed.
2832 scp_p->expand_endorsed();
2833
2834 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2835 // Assemble the bootclasspath elements into the final path.
2836 Arguments::set_sysclasspath(scp_p->combined_path());
2837 }
2838
2839 // This must be done after all arguments have been processed.
2840 // java_compiler() true means set to "NONE" or empty.
2841 if (java_compiler() && !xdebug_mode()) {
2842 // For backwards compatibility, we switch to interpreted mode if
2843 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2844 // not specified.
2845 set_mode_flags(_int);
2846 }
2847 if (CompileThreshold == 0) {
2848 set_mode_flags(_int);
2849 }
2850
2851 #ifndef COMPILER2
2852 // Don't degrade server performance for footprint
2853 if (FLAG_IS_DEFAULT(UseLargePages) &&
2854 MaxHeapSize < LargePageHeapSizeThreshold) {
2855 // No need for large granularity pages w/small heaps.
2856 // Note that large pages are enabled/disabled for both the
2857 // Java heap and the code cache.
2858 FLAG_SET_DEFAULT(UseLargePages, false);
2859 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2860 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2861 }
2862
2863 // Tiered compilation is undefined with C1.
2864 TieredCompilation = false;
2865 #else
2866 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2867 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2868 }
2869 #endif
2870
2871 // If we are running in a headless jre, force java.awt.headless property
2872 // to be true unless the property has already been set.
2873 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2874 if (os::is_headless_jre()) {
2875 const char* headless = Arguments::get_property("java.awt.headless");
2876 if (headless == NULL) {
2877 char envbuffer[128];
2878 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2879 if (!add_property("java.awt.headless=true")) {
2880 return JNI_ENOMEM;
2881 }
2882 } else {
2883 char buffer[256];
2884 strcpy(buffer, "java.awt.headless=");
2885 strcat(buffer, envbuffer);
2886 if (!add_property(buffer)) {
2887 return JNI_ENOMEM;
2888 }
2889 }
2890 }
2891 }
2892
2893 if (!check_vm_args_consistency()) {
2894 return JNI_ERR;
2895 }
2896
2897 return JNI_OK;
2898 }
2899
2900 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2901 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2902 scp_assembly_required_p);
2903 }
2904
2905 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2906 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2907 scp_assembly_required_p);
2908 }
2909
2910 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2911 const int N_MAX_OPTIONS = 64;
2912 const int OPTION_BUFFER_SIZE = 1024;
2913 char buffer[OPTION_BUFFER_SIZE];
2914
2915 // The variable will be ignored if it exceeds the length of the buffer.
2916 // Don't check this variable if user has special privileges
2917 // (e.g. unix su command).
2918 if (os::getenv(name, buffer, sizeof(buffer)) &&
2919 !os::have_special_privileges()) {
2920 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2921 jio_fprintf(defaultStream::error_stream(),
2922 "Picked up %s: %s\n", name, buffer);
2923 char* rd = buffer; // pointer to the input string (rd)
2924 int i;
2925 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2926 while (isspace(*rd)) rd++; // skip whitespace
2927 if (*rd == 0) break; // we re done when the input string is read completely
2928
2929 // The output, option string, overwrites the input string.
2930 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2931 // input string (rd).
2932 char* wrt = rd;
2933
2934 options[i++].optionString = wrt; // Fill in option
2935 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2936 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2937 int quote = *rd; // matching quote to look for
2938 rd++; // don't copy open quote
2939 while (*rd != quote) { // include everything (even spaces) up until quote
2940 if (*rd == 0) { // string termination means unmatched string
2941 jio_fprintf(defaultStream::error_stream(),
2942 "Unmatched quote in %s\n", name);
2943 return JNI_ERR;
2944 }
2945 *wrt++ = *rd++; // copy to option string
2946 }
2947 rd++; // don't copy close quote
2948 } else {
2949 *wrt++ = *rd++; // copy to option string
2950 }
2951 }
2952 // Need to check if we're done before writing a NULL,
2953 // because the write could be to the byte that rd is pointing to.
2954 if (*rd++ == 0) {
2955 *wrt = 0;
2956 break;
2957 }
2958 *wrt = 0; // Zero terminate option
2959 }
2960 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2961 JavaVMInitArgs vm_args;
2962 vm_args.version = JNI_VERSION_1_2;
2963 vm_args.options = options;
2964 vm_args.nOptions = i;
2965 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2966
2967 if (PrintVMOptions) {
2968 const char* tail;
2969 for (int i = 0; i < vm_args.nOptions; i++) {
2970 const JavaVMOption *option = vm_args.options + i;
2971 if (match_option(option, "-XX:", &tail)) {
2972 logOption(tail);
2973 }
2974 }
2975 }
2976
2977 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2978 }
2979 return JNI_OK;
2980 }
2981
2982 void Arguments::set_shared_spaces_flags() {
2983 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
2984 const bool might_share = must_share || UseSharedSpaces;
2985
2986 // CompressedOops cannot be used with CDS. The offsets of oopmaps and
2987 // static fields are incorrect in the archive. With some more clever
2988 // initialization, this restriction can probably be lifted.
2989 // ??? UseLargePages might be okay now
2990 const bool cannot_share = UseCompressedOops ||
2991 (UseLargePages && FLAG_IS_CMDLINE(UseLargePages));
2992 if (cannot_share) {
2993 if (must_share) {
2994 warning("disabling large pages %s"
2995 "because of %s", "" LP64_ONLY("and compressed oops "),
2996 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
2997 FLAG_SET_CMDLINE(bool, UseLargePages, false);
2998 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
2999 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false));
3000 } else {
3001 // Prefer compressed oops and large pages to class data sharing
3002 if (UseSharedSpaces && Verbose) {
3003 warning("turning off use of shared archive because of large pages%s",
3004 "" LP64_ONLY(" and/or compressed oops"));
3005 }
3006 no_shared_spaces();
3007 }
3008 } else if (UseLargePages && might_share) {
3009 // Disable large pages to allow shared spaces. This is sub-optimal, since
3010 // there may not even be a shared archive to use.
3011 FLAG_SET_DEFAULT(UseLargePages, false);
3012 }
3013
3014 // Add 2M to any size for SharedReadOnlySize to get around the JPRT setting
3015 if (DumpSharedSpaces && !FLAG_IS_DEFAULT(SharedReadOnlySize)) {
3016 SharedReadOnlySize = 14*M;
3017 }
3018
3019 if (DumpSharedSpaces) {
3020 if (RequireSharedSpaces) {
3021 warning("cannot dump shared archive while using shared archive");
3022 }
3023 UseSharedSpaces = false;
3024 }
3025 }
3026
3027 // Disable options not supported in this release, with a warning if they
3028 // were explicitly requested on the command-line
3029 #define UNSUPPORTED_OPTION(opt, description) \
3030 do { \
3031 if (opt) { \
3032 if (FLAG_IS_CMDLINE(opt)) { \
3033 warning(description " is disabled in this release."); \
3034 } \
3035 FLAG_SET_DEFAULT(opt, false); \
3036 } \
3037 } while(0)
3038
3039 // Parse entry point called from JNI_CreateJavaVM
3040
3041 jint Arguments::parse(const JavaVMInitArgs* args) {
3042
3043 // Sharing support
3044 // Construct the path to the archive
3045 char jvm_path[JVM_MAXPATHLEN];
3046 os::jvm_path(jvm_path, sizeof(jvm_path));
3047 char *end = strrchr(jvm_path, *os::file_separator());
3048 if (end != NULL) *end = '\0';
3049 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
3050 strlen(os::file_separator()) + 20, mtInternal);
3051 if (shared_archive_path == NULL) return JNI_ENOMEM;
3052 strcpy(shared_archive_path, jvm_path);
3053 strcat(shared_archive_path, os::file_separator());
3054 strcat(shared_archive_path, "classes");
3055 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
3056 strcat(shared_archive_path, ".jsa");
3057 SharedArchivePath = shared_archive_path;
3058
3059 // Remaining part of option string
3060 const char* tail;
3061
3062 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3063 const char* hotspotrc = ".hotspotrc";
3064 bool settings_file_specified = false;
3065 bool needs_hotspotrc_warning = false;
3066
3067 const char* flags_file;
3068 int index;
3069 for (index = 0; index < args->nOptions; index++) {
3070 const JavaVMOption *option = args->options + index;
3071 if (match_option(option, "-XX:Flags=", &tail)) {
3072 flags_file = tail;
3073 settings_file_specified = true;
3074 }
3075 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3076 PrintVMOptions = true;
3077 }
3078 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3079 PrintVMOptions = false;
3080 }
3081 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3082 IgnoreUnrecognizedVMOptions = true;
3083 }
3084 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3085 IgnoreUnrecognizedVMOptions = false;
3086 }
3087 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3088 CommandLineFlags::printFlags(tty, false);
3089 vm_exit(0);
3090 }
3091 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3092 #if INCLUDE_NMT
3093 MemTracker::init_tracking_options(tail);
3094 #else
3095 warning("Native Memory Tracking is not supported in this VM");
3096 #endif
3097 }
3098
3099
3100 #ifndef PRODUCT
3101 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3102 CommandLineFlags::printFlags(tty, true);
3103 vm_exit(0);
3104 }
3105 #endif
3106 }
3107
3108 if (IgnoreUnrecognizedVMOptions) {
3109 // uncast const to modify the flag args->ignoreUnrecognized
3110 *(jboolean*)(&args->ignoreUnrecognized) = true;
3111 }
3112
3113 // Parse specified settings file
3114 if (settings_file_specified) {
3115 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3116 return JNI_EINVAL;
3117 }
3118 } else {
3119 #ifdef ASSERT
3120 // Parse default .hotspotrc settings file
3121 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3122 return JNI_EINVAL;
3123 }
3124 #else
3125 struct stat buf;
3126 if (os::stat(hotspotrc, &buf) == 0) {
3127 needs_hotspotrc_warning = true;
3128 }
3129 #endif
3130 }
3131
3132 if (PrintVMOptions) {
3133 for (index = 0; index < args->nOptions; index++) {
3134 const JavaVMOption *option = args->options + index;
3135 if (match_option(option, "-XX:", &tail)) {
3136 logOption(tail);
3137 }
3138 }
3139 }
3140
3141 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3142 jint result = parse_vm_init_args(args);
3143 if (result != JNI_OK) {
3144 return result;
3145 }
3146
3147 // Delay warning until here so that we've had a chance to process
3148 // the -XX:-PrintWarnings flag
3149 if (needs_hotspotrc_warning) {
3150 warning("%s file is present but has been ignored. "
3151 "Run with -XX:Flags=%s to load the file.",
3152 hotspotrc, hotspotrc);
3153 }
3154
3155 #if (defined JAVASE_EMBEDDED || defined ARM)
3156 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3157 #endif
3158
3159 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3160 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3161 #endif
3162
3163 #if !INCLUDE_ALTERNATE_GCS
3164 if (UseParallelGC) {
3165 warning("Parallel GC is not supported in this VM. Using Serial GC.");
3166 }
3167 if (UseParallelOldGC) {
3168 warning("Parallel Old GC is not supported in this VM. Using Serial GC.");
3169 }
3170 if (UseConcMarkSweepGC) {
3171 warning("Concurrent Mark Sweep GC is not supported in this VM. Using Serial GC.");
3172 }
3173 if (UseParNewGC) {
3174 warning("Par New GC is not supported in this VM. Using Serial GC.");
3175 }
3176 #endif // INCLUDE_ALTERNATE_GCS
3177
3178 #ifndef PRODUCT
3179 if (TraceBytecodesAt != 0) {
3180 TraceBytecodes = true;
3181 }
3182 if (CountCompiledCalls) {
3183 if (UseCounterDecay) {
3184 warning("UseCounterDecay disabled because CountCalls is set");
3185 UseCounterDecay = false;
3186 }
3187 }
3188 #endif // PRODUCT
3189
3190 // JSR 292 is not supported before 1.7
3191 if (!JDK_Version::is_gte_jdk17x_version()) {
3192 if (EnableInvokeDynamic) {
3193 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3194 warning("JSR 292 is not supported before 1.7. Disabling support.");
3195 }
3196 EnableInvokeDynamic = false;
3197 }
3198 }
3199
3200 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3201 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3202 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3203 }
3204 ScavengeRootsInCode = 1;
3205 }
3206
3207 if (PrintGCDetails) {
3208 // Turn on -verbose:gc options as well
3209 PrintGC = true;
3210 }
3211
3212 if (!JDK_Version::is_gte_jdk18x_version()) {
3213 // To avoid changing the log format for 7 updates this flag is only
3214 // true by default in JDK8 and above.
3215 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3216 FLAG_SET_DEFAULT(PrintGCCause, false);
3217 }
3218 }
3219
3220 // Set object alignment values.
3221 set_object_alignment();
3222
3223 #ifdef SERIALGC
3224 force_serial_gc();
3225 #endif // SERIALGC
3226 #if !INCLUDE_CDS
3227 no_shared_spaces();
3228 #endif // INCLUDE_CDS
3229
3230 // Set flags based on ergonomics.
3231 set_ergonomics_flags();
3232
3233 set_shared_spaces_flags();
3234
3235 // Check the GC selections again.
3236 if (!check_gc_consistency()) {
3237 return JNI_EINVAL;
3238 }
3239
3240 if (TieredCompilation) {
3241 set_tiered_flags();
3242 } else {
3243 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3244 if (CompilationPolicyChoice >= 2) {
3245 vm_exit_during_initialization(
3246 "Incompatible compilation policy selected", NULL);
3247 }
3248 }
3249
3250 // Set heap size based on available physical memory
3251 set_heap_size();
3252
3253 #if INCLUDE_ALTERNATE_GCS
3254 // Set per-collector flags
3255 if (UseParallelGC || UseParallelOldGC) {
3256 set_parallel_gc_flags();
3257 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3258 set_cms_and_parnew_gc_flags();
3259 } else if (UseParNewGC) { // skipped if CMS is set above
3260 set_parnew_gc_flags();
3261 } else if (UseG1GC) {
3262 set_g1_gc_flags();
3263 }
3264 check_deprecated_gcs();
3265 #endif // INCLUDE_ALTERNATE_GCS
3266
3267 #ifdef SERIALGC
3268 assert(verify_serial_gc_flags(), "SerialGC unset");
3269 #endif // SERIALGC
3270
3271 // Set bytecode rewriting flags
3272 set_bytecode_flags();
3273
3274 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3275 set_aggressive_opts_flags();
3276
3277 // Turn off biased locking for locking debug mode flags,
3278 // which are subtlely different from each other but neither works with
3279 // biased locking.
3280 if (UseHeavyMonitors
3281 #ifdef COMPILER1
3282 || !UseFastLocking
3283 #endif // COMPILER1
3284 ) {
3285 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3286 // flag set to true on command line; warn the user that they
3287 // can't enable biased locking here
3288 warning("Biased Locking is not supported with locking debug flags"
3289 "; ignoring UseBiasedLocking flag." );
3290 }
3291 UseBiasedLocking = false;
3292 }
3293
3294 #ifdef CC_INTERP
3295 // Clear flags not supported by the C++ interpreter
3296 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3297 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3298 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3299 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
3300 #endif // CC_INTERP
3301
3302 #ifdef COMPILER2
3303 if (!UseBiasedLocking || EmitSync != 0) {
3304 UseOptoBiasInlining = false;
3305 }
3306 if (!EliminateLocks) {
3307 EliminateNestedLocks = false;
3308 }
3309 #endif
3310
3311 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3312 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3313 DebugNonSafepoints = true;
3314 }
3315
3316 #ifndef PRODUCT
3317 if (CompileTheWorld) {
3318 // Force NmethodSweeper to sweep whole CodeCache each time.
3319 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3320 NmethodSweepFraction = 1;
3321 }
3322 }
3323 #endif
3324
3325 if (PrintCommandLineFlags) {
3326 CommandLineFlags::printSetFlags(tty);
3327 }
3328
3329 // Apply CPU specific policy for the BiasedLocking
3330 if (UseBiasedLocking) {
3331 if (!VM_Version::use_biased_locking() &&
3332 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3333 UseBiasedLocking = false;
3334 }
3335 }
3336
3337 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3338 // but only if not already set on the commandline
3339 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3340 bool set = false;
3341 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3342 if (!set) {
3343 FLAG_SET_DEFAULT(PauseAtExit, true);
3344 }
3345 }
3346
3347 return JNI_OK;
3348 }
3349
3350 jint Arguments::adjust_after_os() {
3351 #if INCLUDE_ALTERNATE_GCS
3352 if (UseParallelGC || UseParallelOldGC) {
3353 if (UseNUMA) {
3354 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3355 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3356 }
3357 // For those collectors or operating systems (eg, Windows) that do
3358 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3359 UseNUMAInterleaving = true;
3360 }
3361 }
3362 #endif
3363 return JNI_OK;
3364 }
3365
3366 int Arguments::PropertyList_count(SystemProperty* pl) {
3367 int count = 0;
3368 while(pl != NULL) {
3369 count++;
3370 pl = pl->next();
3371 }
3372 return count;
3373 }
3374
3375 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3376 assert(key != NULL, "just checking");
3377 SystemProperty* prop;
3378 for (prop = pl; prop != NULL; prop = prop->next()) {
3379 if (strcmp(key, prop->key()) == 0) return prop->value();
3380 }
3381 return NULL;
3382 }
3383
3384 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3385 int count = 0;
3386 const char* ret_val = NULL;
3387
3388 while(pl != NULL) {
3389 if(count >= index) {
3390 ret_val = pl->key();
3391 break;
3392 }
3393 count++;
3394 pl = pl->next();
3395 }
3396
3397 return ret_val;
3398 }
3399
3400 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3401 int count = 0;
3402 char* ret_val = NULL;
3403
3404 while(pl != NULL) {
3405 if(count >= index) {
3406 ret_val = pl->value();
3407 break;
3408 }
3409 count++;
3410 pl = pl->next();
3411 }
3412
3413 return ret_val;
3414 }
3415
3416 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3417 SystemProperty* p = *plist;
3418 if (p == NULL) {
3419 *plist = new_p;
3420 } else {
3421 while (p->next() != NULL) {
3422 p = p->next();
3423 }
3424 p->set_next(new_p);
3425 }
3426 }
3427
3428 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3429 if (plist == NULL)
3430 return;
3431
3432 SystemProperty* new_p = new SystemProperty(k, v, true);
3433 PropertyList_add(plist, new_p);
3434 }
3435
3436 // This add maintains unique property key in the list.
3437 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3438 if (plist == NULL)
3439 return;
3440
3441 // If property key exist then update with new value.
3442 SystemProperty* prop;
3443 for (prop = *plist; prop != NULL; prop = prop->next()) {
3444 if (strcmp(k, prop->key()) == 0) {
3445 if (append) {
3446 prop->append_value(v);
3447 } else {
3448 prop->set_value(v);
3449 }
3450 return;
3451 }
3452 }
3453
3454 PropertyList_add(plist, k, v);
3455 }
3456
3457 #ifdef KERNEL
3458 char *Arguments::get_kernel_properties() {
3459 // Find properties starting with kernel and append them to string
3460 // We need to find out how long they are first because the URL's that they
3461 // might point to could get long.
3462 int length = 0;
3463 SystemProperty* prop;
3464 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3465 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3466 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3467 }
3468 }
3469 // Add one for null terminator.
3470 char *props = AllocateHeap(length + 1, mtInternal);
3471 if (length != 0) {
3472 int pos = 0;
3473 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3474 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3475 jio_snprintf(&props[pos], length-pos,
3476 "-D%s=%s ", prop->key(), prop->value());
3477 pos = strlen(props);
3478 }
3479 }
3480 }
3481 // null terminate props in case of null
3482 props[length] = '\0';
3483 return props;
3484 }
3485 #endif // KERNEL
3486
3487 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3488 // Returns true if all of the source pointed by src has been copied over to
3489 // the destination buffer pointed by buf. Otherwise, returns false.
3490 // Notes:
3491 // 1. If the length (buflen) of the destination buffer excluding the
3492 // NULL terminator character is not long enough for holding the expanded
3493 // pid characters, it also returns false instead of returning the partially
3494 // expanded one.
3495 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3496 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3497 char* buf, size_t buflen) {
3498 const char* p = src;
3499 char* b = buf;
3500 const char* src_end = &src[srclen];
3501 char* buf_end = &buf[buflen - 1];
3502
3503 while (p < src_end && b < buf_end) {
3504 if (*p == '%') {
3505 switch (*(++p)) {
3506 case '%': // "%%" ==> "%"
3507 *b++ = *p++;
3508 break;
3509 case 'p': { // "%p" ==> current process id
3510 // buf_end points to the character before the last character so
3511 // that we could write '\0' to the end of the buffer.
3512 size_t buf_sz = buf_end - b + 1;
3513 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3514
3515 // if jio_snprintf fails or the buffer is not long enough to hold
3516 // the expanded pid, returns false.
3517 if (ret < 0 || ret >= (int)buf_sz) {
3518 return false;
3519 } else {
3520 b += ret;
3521 assert(*b == '\0', "fail in copy_expand_pid");
3522 if (p == src_end && b == buf_end + 1) {
3523 // reach the end of the buffer.
3524 return true;
3525 }
3526 }
3527 p++;
3528 break;
3529 }
3530 default :
3531 *b++ = '%';
3532 }
3533 } else {
3534 *b++ = *p++;
3535 }
3536 }
3537 *b = '\0';
3538 return (p == src_end); // return false if not all of the source was copied
3539 }