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268 // Returns true if the flag is obsolete and fits into the range specified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