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