1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "compiler/compilerOracle.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/cardTableRS.hpp"
31 #include "memory/referenceProcessor.hpp"
32 #include "memory/universe.inline.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "prims/jvmtiExport.hpp"
35 #include "runtime/arguments.hpp"
36 #include "runtime/globals_extension.hpp"
37 #include "runtime/java.hpp"
38 #include "services/management.hpp"
39 #include "services/memTracker.hpp"
40 #include "utilities/defaultStream.hpp"
41 #include "utilities/macros.hpp"
42 #include "utilities/taskqueue.hpp"
43 #ifdef TARGET_OS_FAMILY_linux
44 # include "os_linux.inline.hpp"
45 #endif
46 #ifdef TARGET_OS_FAMILY_solaris
47 # include "os_solaris.inline.hpp"
48 #endif
49 #ifdef TARGET_OS_FAMILY_windows
50 # include "os_windows.inline.hpp"
51 #endif
52 #ifdef TARGET_OS_FAMILY_bsd
53 # include "os_bsd.inline.hpp"
54 #endif
55 #if INCLUDE_ALL_GCS
56 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
57 #endif // INCLUDE_ALL_GCS
58
59 // Note: This is a special bug reporting site for the JVM
60 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
61 #define DEFAULT_JAVA_LAUNCHER "generic"
62
63 char** Arguments::_jvm_flags_array = NULL;
64 int Arguments::_num_jvm_flags = 0;
65 char** Arguments::_jvm_args_array = NULL;
66 int Arguments::_num_jvm_args = 0;
67 char* Arguments::_java_command = NULL;
68 SystemProperty* Arguments::_system_properties = NULL;
69 const char* Arguments::_gc_log_filename = NULL;
70 bool Arguments::_has_profile = false;
71 bool Arguments::_has_alloc_profile = false;
72 uintx Arguments::_min_heap_size = 0;
73 Arguments::Mode Arguments::_mode = _mixed;
74 bool Arguments::_java_compiler = false;
75 bool Arguments::_xdebug_mode = false;
76 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
77 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
78 int Arguments::_sun_java_launcher_pid = -1;
79 bool Arguments::_created_by_gamma_launcher = false;
80
81 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
82 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
83 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
84 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
85 bool Arguments::_ClipInlining = ClipInlining;
86
87 char* Arguments::SharedArchivePath = NULL;
88
89 AgentLibraryList Arguments::_libraryList;
90 AgentLibraryList Arguments::_agentList;
91
92 abort_hook_t Arguments::_abort_hook = NULL;
93 exit_hook_t Arguments::_exit_hook = NULL;
94 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
95
96
97 SystemProperty *Arguments::_java_ext_dirs = NULL;
98 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
99 SystemProperty *Arguments::_sun_boot_library_path = NULL;
100 SystemProperty *Arguments::_java_library_path = NULL;
101 SystemProperty *Arguments::_java_home = NULL;
102 SystemProperty *Arguments::_java_class_path = NULL;
103 SystemProperty *Arguments::_sun_boot_class_path = NULL;
104
105 char* Arguments::_meta_index_path = NULL;
106 char* Arguments::_meta_index_dir = NULL;
107
108 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
109
110 static bool match_option(const JavaVMOption *option, const char* name,
111 const char** tail) {
112 int len = (int)strlen(name);
113 if (strncmp(option->optionString, name, len) == 0) {
114 *tail = option->optionString + len;
115 return true;
116 } else {
117 return false;
118 }
119 }
120
121 static void logOption(const char* opt) {
122 if (PrintVMOptions) {
123 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
124 }
125 }
126
127 // Process java launcher properties.
128 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
129 // See if sun.java.launcher or sun.java.launcher.pid is defined.
130 // Must do this before setting up other system properties,
131 // as some of them may depend on launcher type.
132 for (int index = 0; index < args->nOptions; index++) {
133 const JavaVMOption* option = args->options + index;
134 const char* tail;
135
136 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
137 process_java_launcher_argument(tail, option->extraInfo);
138 continue;
139 }
140 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
141 _sun_java_launcher_pid = atoi(tail);
142 continue;
143 }
144 }
145 }
146
147 // Initialize system properties key and value.
148 void Arguments::init_system_properties() {
149
150 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
151 "Java Virtual Machine Specification", false));
152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
154 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
155
156 // following are JVMTI agent writeable properties.
157 // Properties values are set to NULL and they are
158 // os specific they are initialized in os::init_system_properties_values().
159 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
160 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
161 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
162 _java_library_path = new SystemProperty("java.library.path", NULL, true);
163 _java_home = new SystemProperty("java.home", NULL, true);
164 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
165
166 _java_class_path = new SystemProperty("java.class.path", "", true);
167
168 // Add to System Property list.
169 PropertyList_add(&_system_properties, _java_ext_dirs);
170 PropertyList_add(&_system_properties, _java_endorsed_dirs);
171 PropertyList_add(&_system_properties, _sun_boot_library_path);
172 PropertyList_add(&_system_properties, _java_library_path);
173 PropertyList_add(&_system_properties, _java_home);
174 PropertyList_add(&_system_properties, _java_class_path);
175 PropertyList_add(&_system_properties, _sun_boot_class_path);
176
177 // Set OS specific system properties values
178 os::init_system_properties_values();
179 }
180
181
182 // Update/Initialize System properties after JDK version number is known
183 void Arguments::init_version_specific_system_properties() {
184 enum { bufsz = 16 };
185 char buffer[bufsz];
186 const char* spec_vendor = "Sun Microsystems Inc.";
187 uint32_t spec_version = 0;
188
189 if (JDK_Version::is_gte_jdk17x_version()) {
190 spec_vendor = "Oracle Corporation";
191 spec_version = JDK_Version::current().major_version();
192 }
193 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
194
195 PropertyList_add(&_system_properties,
196 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
197 PropertyList_add(&_system_properties,
198 new SystemProperty("java.vm.specification.version", buffer, false));
199 PropertyList_add(&_system_properties,
200 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
201 }
202
203 /**
204 * Provide a slightly more user-friendly way of eliminating -XX flags.
205 * When a flag is eliminated, it can be added to this list in order to
206 * continue accepting this flag on the command-line, while issuing a warning
207 * and ignoring the value. Once the JDK version reaches the 'accept_until'
208 * limit, we flatly refuse to admit the existence of the flag. This allows
209 * a flag to die correctly over JDK releases using HSX.
210 */
211 typedef struct {
212 const char* name;
213 JDK_Version obsoleted_in; // when the flag went away
214 JDK_Version accept_until; // which version to start denying the existence
215 } ObsoleteFlag;
216
217 static ObsoleteFlag obsolete_jvm_flags[] = {
218 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
230 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
231 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
232 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
233 { "DefaultInitialRAMFraction",
234 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
235 { "UseDepthFirstScavengeOrder",
236 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
237 { "HandlePromotionFailure",
238 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
239 { "MaxLiveObjectEvacuationRatio",
240 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
241 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
242 { "UseParallelOldGCCompacting",
243 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
244 { "UseParallelDensePrefixUpdate",
245 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
246 { "UseParallelOldGCDensePrefix",
247 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
248 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
249 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
250 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
251 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
252 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
253 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
254 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
255 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
256 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
257 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
258 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
259 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
260 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
261 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
262 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
263 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
264 #ifdef PRODUCT
265 { "DesiredMethodLimit",
266 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
267 #endif // PRODUCT
268 { NULL, JDK_Version(0), JDK_Version(0) }
269 };
270
271 // Returns true if the flag is obsolete and fits into the range specified
272 // for being ignored. In the case that the flag is ignored, the 'version'
273 // value is filled in with the version number when the flag became
274 // obsolete so that that value can be displayed to the user.
275 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
276 int i = 0;
277 assert(version != NULL, "Must provide a version buffer");
278 while (obsolete_jvm_flags[i].name != NULL) {
279 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
280 // <flag>=xxx form
281 // [-|+]<flag> form
282 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
283 ((s[0] == '+' || s[0] == '-') &&
284 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
285 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
286 *version = flag_status.obsoleted_in;
287 return true;
288 }
289 }
290 i++;
291 }
292 return false;
293 }
294
295 // Constructs the system class path (aka boot class path) from the following
296 // components, in order:
297 //
298 // prefix // from -Xbootclasspath/p:...
299 // endorsed // the expansion of -Djava.endorsed.dirs=...
300 // base // from os::get_system_properties() or -Xbootclasspath=
301 // suffix // from -Xbootclasspath/a:...
302 //
303 // java.endorsed.dirs is a list of directories; any jar or zip files in the
304 // directories are added to the sysclasspath just before the base.
305 //
306 // This could be AllStatic, but it isn't needed after argument processing is
307 // complete.
308 class SysClassPath: public StackObj {
309 public:
310 SysClassPath(const char* base);
311 ~SysClassPath();
312
313 inline void set_base(const char* base);
314 inline void add_prefix(const char* prefix);
315 inline void add_suffix_to_prefix(const char* suffix);
316 inline void add_suffix(const char* suffix);
317 inline void reset_path(const char* base);
318
319 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
320 // property. Must be called after all command-line arguments have been
321 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
322 // combined_path().
323 void expand_endorsed();
324
325 inline const char* get_base() const { return _items[_scp_base]; }
326 inline const char* get_prefix() const { return _items[_scp_prefix]; }
327 inline const char* get_suffix() const { return _items[_scp_suffix]; }
328 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
329
330 // Combine all the components into a single c-heap-allocated string; caller
331 // must free the string if/when no longer needed.
332 char* combined_path();
333
334 private:
335 // Utility routines.
336 static char* add_to_path(const char* path, const char* str, bool prepend);
337 static char* add_jars_to_path(char* path, const char* directory);
338
339 inline void reset_item_at(int index);
340
341 // Array indices for the items that make up the sysclasspath. All except the
342 // base are allocated in the C heap and freed by this class.
343 enum {
344 _scp_prefix, // from -Xbootclasspath/p:...
345 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
346 _scp_base, // the default sysclasspath
347 _scp_suffix, // from -Xbootclasspath/a:...
348 _scp_nitems // the number of items, must be last.
349 };
350
351 const char* _items[_scp_nitems];
352 DEBUG_ONLY(bool _expansion_done;)
353 };
354
355 SysClassPath::SysClassPath(const char* base) {
356 memset(_items, 0, sizeof(_items));
357 _items[_scp_base] = base;
358 DEBUG_ONLY(_expansion_done = false;)
359 }
360
361 SysClassPath::~SysClassPath() {
362 // Free everything except the base.
363 for (int i = 0; i < _scp_nitems; ++i) {
364 if (i != _scp_base) reset_item_at(i);
365 }
366 DEBUG_ONLY(_expansion_done = false;)
367 }
368
369 inline void SysClassPath::set_base(const char* base) {
370 _items[_scp_base] = base;
371 }
372
373 inline void SysClassPath::add_prefix(const char* prefix) {
374 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
375 }
376
377 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
378 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
379 }
380
381 inline void SysClassPath::add_suffix(const char* suffix) {
382 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
383 }
384
385 inline void SysClassPath::reset_item_at(int index) {
386 assert(index < _scp_nitems && index != _scp_base, "just checking");
387 if (_items[index] != NULL) {
388 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
389 _items[index] = NULL;
390 }
391 }
392
393 inline void SysClassPath::reset_path(const char* base) {
394 // Clear the prefix and suffix.
395 reset_item_at(_scp_prefix);
396 reset_item_at(_scp_suffix);
397 set_base(base);
398 }
399
400 //------------------------------------------------------------------------------
401
402 void SysClassPath::expand_endorsed() {
403 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
404
405 const char* path = Arguments::get_property("java.endorsed.dirs");
406 if (path == NULL) {
407 path = Arguments::get_endorsed_dir();
408 assert(path != NULL, "no default for java.endorsed.dirs");
409 }
410
411 char* expanded_path = NULL;
412 const char separator = *os::path_separator();
413 const char* const end = path + strlen(path);
414 while (path < end) {
415 const char* tmp_end = strchr(path, separator);
416 if (tmp_end == NULL) {
417 expanded_path = add_jars_to_path(expanded_path, path);
418 path = end;
419 } else {
420 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
421 memcpy(dirpath, path, tmp_end - path);
422 dirpath[tmp_end - path] = '\0';
423 expanded_path = add_jars_to_path(expanded_path, dirpath);
424 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
425 path = tmp_end + 1;
426 }
427 }
428 _items[_scp_endorsed] = expanded_path;
429 DEBUG_ONLY(_expansion_done = true;)
430 }
431
432 // Combine the bootclasspath elements, some of which may be null, into a single
433 // c-heap-allocated string.
434 char* SysClassPath::combined_path() {
435 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
436 assert(_expansion_done, "must call expand_endorsed() first.");
437
438 size_t lengths[_scp_nitems];
439 size_t total_len = 0;
440
441 const char separator = *os::path_separator();
442
443 // Get the lengths.
444 int i;
445 for (i = 0; i < _scp_nitems; ++i) {
446 if (_items[i] != NULL) {
447 lengths[i] = strlen(_items[i]);
448 // Include space for the separator char (or a NULL for the last item).
449 total_len += lengths[i] + 1;
450 }
451 }
452 assert(total_len > 0, "empty sysclasspath not allowed");
453
454 // Copy the _items to a single string.
455 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
456 char* cp_tmp = cp;
457 for (i = 0; i < _scp_nitems; ++i) {
458 if (_items[i] != NULL) {
459 memcpy(cp_tmp, _items[i], lengths[i]);
460 cp_tmp += lengths[i];
461 *cp_tmp++ = separator;
462 }
463 }
464 *--cp_tmp = '\0'; // Replace the extra separator.
465 return cp;
466 }
467
468 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
469 char*
470 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
471 char *cp;
472
473 assert(str != NULL, "just checking");
474 if (path == NULL) {
475 size_t len = strlen(str) + 1;
476 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
477 memcpy(cp, str, len); // copy the trailing null
478 } else {
479 const char separator = *os::path_separator();
480 size_t old_len = strlen(path);
481 size_t str_len = strlen(str);
482 size_t len = old_len + str_len + 2;
483
484 if (prepend) {
485 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
486 char* cp_tmp = cp;
487 memcpy(cp_tmp, str, str_len);
488 cp_tmp += str_len;
489 *cp_tmp = separator;
490 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
491 FREE_C_HEAP_ARRAY(char, path, mtInternal);
492 } else {
493 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
494 char* cp_tmp = cp + old_len;
495 *cp_tmp = separator;
496 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
497 }
498 }
499 return cp;
500 }
501
502 // Scan the directory and append any jar or zip files found to path.
503 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
504 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
505 DIR* dir = os::opendir(directory);
506 if (dir == NULL) return path;
507
508 char dir_sep[2] = { '\0', '\0' };
509 size_t directory_len = strlen(directory);
510 const char fileSep = *os::file_separator();
511 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
512
513 /* Scan the directory for jars/zips, appending them to path. */
514 struct dirent *entry;
515 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
516 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
517 const char* name = entry->d_name;
518 const char* ext = name + strlen(name) - 4;
519 bool isJarOrZip = ext > name &&
520 (os::file_name_strcmp(ext, ".jar") == 0 ||
521 os::file_name_strcmp(ext, ".zip") == 0);
522 if (isJarOrZip) {
523 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
524 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
525 path = add_to_path(path, jarpath, false);
526 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
527 }
528 }
529 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
530 os::closedir(dir);
531 return path;
532 }
533
534 // Parses a memory size specification string.
535 static bool atomull(const char *s, julong* result) {
536 julong n = 0;
537 int args_read = sscanf(s, JULONG_FORMAT, &n);
538 if (args_read != 1) {
539 return false;
540 }
541 while (*s != '\0' && isdigit(*s)) {
542 s++;
543 }
544 // 4705540: illegal if more characters are found after the first non-digit
545 if (strlen(s) > 1) {
546 return false;
547 }
548 switch (*s) {
549 case 'T': case 't':
550 *result = n * G * K;
551 // Check for overflow.
552 if (*result/((julong)G * K) != n) return false;
553 return true;
554 case 'G': case 'g':
555 *result = n * G;
556 if (*result/G != n) return false;
557 return true;
558 case 'M': case 'm':
559 *result = n * M;
560 if (*result/M != n) return false;
561 return true;
562 case 'K': case 'k':
563 *result = n * K;
564 if (*result/K != n) return false;
565 return true;
566 case '\0':
567 *result = n;
568 return true;
569 default:
570 return false;
571 }
572 }
573
574 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
575 if (size < min_size) return arg_too_small;
576 // Check that size will fit in a size_t (only relevant on 32-bit)
577 if (size > max_uintx) return arg_too_big;
578 return arg_in_range;
579 }
580
581 // Describe an argument out of range error
582 void Arguments::describe_range_error(ArgsRange errcode) {
583 switch(errcode) {
584 case arg_too_big:
585 jio_fprintf(defaultStream::error_stream(),
586 "The specified size exceeds the maximum "
587 "representable size.\n");
588 break;
589 case arg_too_small:
590 case arg_unreadable:
591 case arg_in_range:
592 // do nothing for now
593 break;
594 default:
595 ShouldNotReachHere();
596 }
597 }
598
599 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
600 return CommandLineFlags::boolAtPut(name, &value, origin);
601 }
602
603 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
604 double v;
605 if (sscanf(value, "%lf", &v) != 1) {
606 return false;
607 }
608
609 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
610 return true;
611 }
612 return false;
613 }
614
615 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
616 julong v;
617 intx intx_v;
618 bool is_neg = false;
619 // Check the sign first since atomull() parses only unsigned values.
620 if (*value == '-') {
621 if (!CommandLineFlags::intxAt(name, &intx_v)) {
622 return false;
623 }
624 value++;
625 is_neg = true;
626 }
627 if (!atomull(value, &v)) {
628 return false;
629 }
630 intx_v = (intx) v;
631 if (is_neg) {
632 intx_v = -intx_v;
633 }
634 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
635 return true;
636 }
637 uintx uintx_v = (uintx) v;
638 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
639 return true;
640 }
641 uint64_t uint64_t_v = (uint64_t) v;
642 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
643 return true;
644 }
645 return false;
646 }
647
648 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
649 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
650 // Contract: CommandLineFlags always returns a pointer that needs freeing.
651 FREE_C_HEAP_ARRAY(char, value, mtInternal);
652 return true;
653 }
654
655 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
656 const char* old_value = "";
657 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
658 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
659 size_t new_len = strlen(new_value);
660 const char* value;
661 char* free_this_too = NULL;
662 if (old_len == 0) {
663 value = new_value;
664 } else if (new_len == 0) {
665 value = old_value;
666 } else {
667 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
668 // each new setting adds another LINE to the switch:
669 sprintf(buf, "%s\n%s", old_value, new_value);
670 value = buf;
671 free_this_too = buf;
672 }
673 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
674 // CommandLineFlags always returns a pointer that needs freeing.
675 FREE_C_HEAP_ARRAY(char, value, mtInternal);
676 if (free_this_too != NULL) {
677 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
678 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
679 }
680 return true;
681 }
682
683 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
684
685 // range of acceptable characters spelled out for portability reasons
686 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
687 #define BUFLEN 255
688 char name[BUFLEN+1];
689 char dummy;
690
691 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
692 return set_bool_flag(name, false, origin);
693 }
694 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
695 return set_bool_flag(name, true, origin);
696 }
697
698 char punct;
699 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
700 const char* value = strchr(arg, '=') + 1;
701 Flag* flag = Flag::find_flag(name, strlen(name));
702 if (flag != NULL && flag->is_ccstr()) {
703 if (flag->ccstr_accumulates()) {
704 return append_to_string_flag(name, value, origin);
705 } else {
706 if (value[0] == '\0') {
707 value = NULL;
708 }
709 return set_string_flag(name, value, origin);
710 }
711 }
712 }
713
714 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
715 const char* value = strchr(arg, '=') + 1;
716 // -XX:Foo:=xxx will reset the string flag to the given value.
717 if (value[0] == '\0') {
718 value = NULL;
719 }
720 return set_string_flag(name, value, origin);
721 }
722
723 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
724 #define SIGNED_NUMBER_RANGE "[-0123456789]"
725 #define NUMBER_RANGE "[0123456789]"
726 char value[BUFLEN + 1];
727 char value2[BUFLEN + 1];
728 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
729 // Looks like a floating-point number -- try again with more lenient format string
730 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
731 return set_fp_numeric_flag(name, value, origin);
732 }
733 }
734
735 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
736 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
737 return set_numeric_flag(name, value, origin);
738 }
739
740 return false;
741 }
742
743 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
744 assert(bldarray != NULL, "illegal argument");
745
746 if (arg == NULL) {
747 return;
748 }
749
750 int new_count = *count + 1;
751
752 // expand the array and add arg to the last element
753 if (*bldarray == NULL) {
754 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
755 } else {
756 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
757 }
758 (*bldarray)[*count] = strdup(arg);
759 *count = new_count;
760 }
761
762 void Arguments::build_jvm_args(const char* arg) {
763 add_string(&_jvm_args_array, &_num_jvm_args, arg);
764 }
765
766 void Arguments::build_jvm_flags(const char* arg) {
767 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
768 }
769
770 // utility function to return a string that concatenates all
771 // strings in a given char** array
772 const char* Arguments::build_resource_string(char** args, int count) {
773 if (args == NULL || count == 0) {
774 return NULL;
775 }
776 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
777 for (int i = 1; i < count; i++) {
778 length += strlen(args[i]) + 1; // add 1 for a space
779 }
780 char* s = NEW_RESOURCE_ARRAY(char, length);
781 strcpy(s, args[0]);
782 for (int j = 1; j < count; j++) {
783 strcat(s, " ");
784 strcat(s, args[j]);
785 }
786 return (const char*) s;
787 }
788
789 void Arguments::print_on(outputStream* st) {
790 st->print_cr("VM Arguments:");
791 if (num_jvm_flags() > 0) {
792 st->print("jvm_flags: "); print_jvm_flags_on(st);
793 }
794 if (num_jvm_args() > 0) {
795 st->print("jvm_args: "); print_jvm_args_on(st);
796 }
797 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
798 if (_java_class_path != NULL) {
799 char* path = _java_class_path->value();
800 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
801 }
802 st->print_cr("Launcher Type: %s", _sun_java_launcher);
803 }
804
805 void Arguments::print_jvm_flags_on(outputStream* st) {
806 if (_num_jvm_flags > 0) {
807 for (int i=0; i < _num_jvm_flags; i++) {
808 st->print("%s ", _jvm_flags_array[i]);
809 }
810 st->print_cr("");
811 }
812 }
813
814 void Arguments::print_jvm_args_on(outputStream* st) {
815 if (_num_jvm_args > 0) {
816 for (int i=0; i < _num_jvm_args; i++) {
817 st->print("%s ", _jvm_args_array[i]);
818 }
819 st->print_cr("");
820 }
821 }
822
823 bool Arguments::process_argument(const char* arg,
824 jboolean ignore_unrecognized, FlagValueOrigin origin) {
825
826 JDK_Version since = JDK_Version();
827
828 if (parse_argument(arg, origin) || ignore_unrecognized) {
829 return true;
830 }
831
832 bool has_plus_minus = (*arg == '+' || *arg == '-');
833 const char* const argname = has_plus_minus ? arg + 1 : arg;
834 if (is_newly_obsolete(arg, &since)) {
835 char version[256];
836 since.to_string(version, sizeof(version));
837 warning("ignoring option %s; support was removed in %s", argname, version);
838 return true;
839 }
840
841 // For locked flags, report a custom error message if available.
842 // Otherwise, report the standard unrecognized VM option.
843
844 size_t arg_len;
845 const char* equal_sign = strchr(argname, '=');
846 if (equal_sign == NULL) {
847 arg_len = strlen(argname);
848 } else {
849 arg_len = equal_sign - argname;
850 }
851
852 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true);
853 if (found_flag != NULL) {
854 char locked_message_buf[BUFLEN];
855 found_flag->get_locked_message(locked_message_buf, BUFLEN);
856 if (strlen(locked_message_buf) == 0) {
857 if (found_flag->is_bool() && !has_plus_minus) {
858 jio_fprintf(defaultStream::error_stream(),
859 "Missing +/- setting for VM option '%s'\n", argname);
860 } else if (!found_flag->is_bool() && has_plus_minus) {
861 jio_fprintf(defaultStream::error_stream(),
862 "Unexpected +/- setting in VM option '%s'\n", argname);
863 } else {
864 jio_fprintf(defaultStream::error_stream(),
865 "Improperly specified VM option '%s'\n", argname);
866 }
867 } else {
868 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
869 }
870 } else {
871 jio_fprintf(defaultStream::error_stream(),
872 "Unrecognized VM option '%s'\n", argname);
873 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
874 if (fuzzy_matched != NULL) {
875 jio_fprintf(defaultStream::error_stream(),
876 "Did you mean '%s%s%s'?\n",
877 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
878 fuzzy_matched->name,
879 (fuzzy_matched->is_bool()) ? "" : "=<value>");
880 }
881 }
882
883 // allow for commandline "commenting out" options like -XX:#+Verbose
884 return arg[0] == '#';
885 }
886
887 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
888 FILE* stream = fopen(file_name, "rb");
889 if (stream == NULL) {
890 if (should_exist) {
891 jio_fprintf(defaultStream::error_stream(),
892 "Could not open settings file %s\n", file_name);
893 return false;
894 } else {
895 return true;
896 }
897 }
898
899 char token[1024];
900 int pos = 0;
901
902 bool in_white_space = true;
903 bool in_comment = false;
904 bool in_quote = false;
905 char quote_c = 0;
906 bool result = true;
907
908 int c = getc(stream);
909 while(c != EOF && pos < (int)(sizeof(token)-1)) {
910 if (in_white_space) {
911 if (in_comment) {
912 if (c == '\n') in_comment = false;
913 } else {
914 if (c == '#') in_comment = true;
915 else if (!isspace(c)) {
916 in_white_space = false;
917 token[pos++] = c;
918 }
919 }
920 } else {
921 if (c == '\n' || (!in_quote && isspace(c))) {
922 // token ends at newline, or at unquoted whitespace
923 // this allows a way to include spaces in string-valued options
924 token[pos] = '\0';
925 logOption(token);
926 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
927 build_jvm_flags(token);
928 pos = 0;
929 in_white_space = true;
930 in_quote = false;
931 } else if (!in_quote && (c == '\'' || c == '"')) {
932 in_quote = true;
933 quote_c = c;
934 } else if (in_quote && (c == quote_c)) {
935 in_quote = false;
936 } else {
937 token[pos++] = c;
938 }
939 }
940 c = getc(stream);
941 }
942 if (pos > 0) {
943 token[pos] = '\0';
944 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
945 build_jvm_flags(token);
946 }
947 fclose(stream);
948 return result;
949 }
950
951 //=============================================================================================================
952 // Parsing of properties (-D)
953
954 const char* Arguments::get_property(const char* key) {
955 return PropertyList_get_value(system_properties(), key);
956 }
957
958 bool Arguments::add_property(const char* prop) {
959 const char* eq = strchr(prop, '=');
960 char* key;
961 // ns must be static--its address may be stored in a SystemProperty object.
962 const static char ns[1] = {0};
963 char* value = (char *)ns;
964
965 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
966 key = AllocateHeap(key_len + 1, mtInternal);
967 strncpy(key, prop, key_len);
968 key[key_len] = '\0';
969
970 if (eq != NULL) {
971 size_t value_len = strlen(prop) - key_len - 1;
972 value = AllocateHeap(value_len + 1, mtInternal);
973 strncpy(value, &prop[key_len + 1], value_len + 1);
974 }
975
976 if (strcmp(key, "java.compiler") == 0) {
977 process_java_compiler_argument(value);
978 FreeHeap(key);
979 if (eq != NULL) {
980 FreeHeap(value);
981 }
982 return true;
983 } else if (strcmp(key, "sun.java.command") == 0) {
984 _java_command = value;
985
986 // Record value in Arguments, but let it get passed to Java.
987 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
988 // launcher.pid property is private and is processed
989 // in process_sun_java_launcher_properties();
990 // the sun.java.launcher property is passed on to the java application
991 FreeHeap(key);
992 if (eq != NULL) {
993 FreeHeap(value);
994 }
995 return true;
996 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
997 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
998 // its value without going through the property list or making a Java call.
999 _java_vendor_url_bug = value;
1000 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1001 PropertyList_unique_add(&_system_properties, key, value, true);
1002 return true;
1003 }
1004 // Create new property and add at the end of the list
1005 PropertyList_unique_add(&_system_properties, key, value);
1006 return true;
1007 }
1008
1009 //===========================================================================================================
1010 // Setting int/mixed/comp mode flags
1011
1012 void Arguments::set_mode_flags(Mode mode) {
1013 // Set up default values for all flags.
1014 // If you add a flag to any of the branches below,
1015 // add a default value for it here.
1016 set_java_compiler(false);
1017 _mode = mode;
1018
1019 // Ensure Agent_OnLoad has the correct initial values.
1020 // This may not be the final mode; mode may change later in onload phase.
1021 PropertyList_unique_add(&_system_properties, "java.vm.info",
1022 (char*)VM_Version::vm_info_string(), false);
1023
1024 UseInterpreter = true;
1025 UseCompiler = true;
1026 UseLoopCounter = true;
1027
1028 #ifndef ZERO
1029 // Turn these off for mixed and comp. Leave them on for Zero.
1030 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1031 UseFastAccessorMethods = (mode == _int);
1032 }
1033 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1034 UseFastEmptyMethods = (mode == _int);
1035 }
1036 #endif
1037
1038 // Default values may be platform/compiler dependent -
1039 // use the saved values
1040 ClipInlining = Arguments::_ClipInlining;
1041 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1042 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1043 BackgroundCompilation = Arguments::_BackgroundCompilation;
1044
1045 // Change from defaults based on mode
1046 switch (mode) {
1047 default:
1048 ShouldNotReachHere();
1049 break;
1050 case _int:
1051 UseCompiler = false;
1052 UseLoopCounter = false;
1053 AlwaysCompileLoopMethods = false;
1054 UseOnStackReplacement = false;
1055 break;
1056 case _mixed:
1057 // same as default
1058 break;
1059 case _comp:
1060 UseInterpreter = false;
1061 BackgroundCompilation = false;
1062 ClipInlining = false;
1063 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1064 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1065 // compile a level 4 (C2) and then continue executing it.
1066 if (TieredCompilation) {
1067 Tier3InvokeNotifyFreqLog = 0;
1068 Tier4InvocationThreshold = 0;
1069 }
1070 break;
1071 }
1072 }
1073
1074 // Conflict: required to use shared spaces (-Xshare:on), but
1075 // incompatible command line options were chosen.
1076
1077 static void no_shared_spaces() {
1078 if (RequireSharedSpaces) {
1079 jio_fprintf(defaultStream::error_stream(),
1080 "Class data sharing is inconsistent with other specified options.\n");
1081 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1082 } else {
1083 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1084 }
1085 }
1086
1087 void Arguments::set_tiered_flags() {
1088 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1089 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1090 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1091 }
1092 if (CompilationPolicyChoice < 2) {
1093 vm_exit_during_initialization(
1094 "Incompatible compilation policy selected", NULL);
1095 }
1096 // Increase the code cache size - tiered compiles a lot more.
1097 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1098 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1099 }
1100 if (!UseInterpreter) { // -Xcomp
1101 Tier3InvokeNotifyFreqLog = 0;
1102 Tier4InvocationThreshold = 0;
1103 }
1104 }
1105
1106 #if INCLUDE_ALL_GCS
1107 static void disable_adaptive_size_policy(const char* collector_name) {
1108 if (UseAdaptiveSizePolicy) {
1109 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1110 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1111 collector_name);
1112 }
1113 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1114 }
1115 }
1116
1117 void Arguments::set_parnew_gc_flags() {
1118 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1119 "control point invariant");
1120 assert(UseParNewGC, "Error");
1121
1122 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1123 disable_adaptive_size_policy("UseParNewGC");
1124
1125 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1126 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1127 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1128 } else if (ParallelGCThreads == 0) {
1129 jio_fprintf(defaultStream::error_stream(),
1130 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1131 vm_exit(1);
1132 }
1133
1134 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1135 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1136 // we set them to 1024 and 1024.
1137 // See CR 6362902.
1138 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1139 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1140 }
1141 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1142 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1143 }
1144
1145 // When using compressed oops, we use local overflow stacks,
1146 // rather than using a global overflow list chained through
1147 // the klass word of the object's pre-image.
1148 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1149 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1150 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1151 }
1152 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1153 }
1154 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1155 }
1156
1157 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1158 // sparc/solaris for certain applications, but would gain from
1159 // further optimization and tuning efforts, and would almost
1160 // certainly gain from analysis of platform and environment.
1161 void Arguments::set_cms_and_parnew_gc_flags() {
1162 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1163 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1164
1165 // If we are using CMS, we prefer to UseParNewGC,
1166 // unless explicitly forbidden.
1167 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1168 FLAG_SET_ERGO(bool, UseParNewGC, true);
1169 }
1170
1171 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1172 disable_adaptive_size_policy("UseConcMarkSweepGC");
1173
1174 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1175 // as needed.
1176 if (UseParNewGC) {
1177 set_parnew_gc_flags();
1178 }
1179
1180 size_t max_heap = align_size_down(MaxHeapSize,
1181 CardTableRS::ct_max_alignment_constraint());
1182
1183 // Now make adjustments for CMS
1184 intx tenuring_default = (intx)6;
1185 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1186
1187 // Preferred young gen size for "short" pauses:
1188 // upper bound depends on # of threads and NewRatio.
1189 const uintx parallel_gc_threads =
1190 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1191 const size_t preferred_max_new_size_unaligned =
1192 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1193 size_t preferred_max_new_size =
1194 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1195
1196 // Unless explicitly requested otherwise, size young gen
1197 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1198
1199 // If either MaxNewSize or NewRatio is set on the command line,
1200 // assume the user is trying to set the size of the young gen.
1201 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1202
1203 // Set MaxNewSize to our calculated preferred_max_new_size unless
1204 // NewSize was set on the command line and it is larger than
1205 // preferred_max_new_size.
1206 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1207 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1208 } else {
1209 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1210 }
1211 if (PrintGCDetails && Verbose) {
1212 // Too early to use gclog_or_tty
1213 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1214 }
1215
1216 // Code along this path potentially sets NewSize and OldSize
1217 if (PrintGCDetails && Verbose) {
1218 // Too early to use gclog_or_tty
1219 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1220 " initial_heap_size: " SIZE_FORMAT
1221 " max_heap: " SIZE_FORMAT,
1222 min_heap_size(), InitialHeapSize, max_heap);
1223 }
1224 size_t min_new = preferred_max_new_size;
1225 if (FLAG_IS_CMDLINE(NewSize)) {
1226 min_new = NewSize;
1227 }
1228 if (max_heap > min_new && min_heap_size() > min_new) {
1229 // Unless explicitly requested otherwise, make young gen
1230 // at least min_new, and at most preferred_max_new_size.
1231 if (FLAG_IS_DEFAULT(NewSize)) {
1232 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1233 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1234 if (PrintGCDetails && Verbose) {
1235 // Too early to use gclog_or_tty
1236 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1237 }
1238 }
1239 // Unless explicitly requested otherwise, size old gen
1240 // so it's NewRatio x of NewSize.
1241 if (FLAG_IS_DEFAULT(OldSize)) {
1242 if (max_heap > NewSize) {
1243 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1244 if (PrintGCDetails && Verbose) {
1245 // Too early to use gclog_or_tty
1246 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1247 }
1248 }
1249 }
1250 }
1251 }
1252 // Unless explicitly requested otherwise, definitely
1253 // promote all objects surviving "tenuring_default" scavenges.
1254 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1255 FLAG_IS_DEFAULT(SurvivorRatio)) {
1256 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1257 }
1258 // If we decided above (or user explicitly requested)
1259 // `promote all' (via MaxTenuringThreshold := 0),
1260 // prefer minuscule survivor spaces so as not to waste
1261 // space for (non-existent) survivors
1262 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1263 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1264 }
1265 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1266 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1267 // This is done in order to make ParNew+CMS configuration to work
1268 // with YoungPLABSize and OldPLABSize options.
1269 // See CR 6362902.
1270 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1271 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1272 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1273 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1274 // the value (either from the command line or ergonomics) of
1275 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1276 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1277 } else {
1278 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1279 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1280 // we'll let it to take precedence.
1281 jio_fprintf(defaultStream::error_stream(),
1282 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1283 " options are specified for the CMS collector."
1284 " CMSParPromoteBlocksToClaim will take precedence.\n");
1285 }
1286 }
1287 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1288 // OldPLAB sizing manually turned off: Use a larger default setting,
1289 // unless it was manually specified. This is because a too-low value
1290 // will slow down scavenges.
1291 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1292 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1293 }
1294 }
1295 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1296 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1297 // If either of the static initialization defaults have changed, note this
1298 // modification.
1299 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1300 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1301 }
1302 if (PrintGCDetails && Verbose) {
1303 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1304 MarkStackSize / K, MarkStackSizeMax / K);
1305 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1306 }
1307 }
1308 #endif // INCLUDE_ALL_GCS
1309
1310 void set_object_alignment() {
1311 // Object alignment.
1312 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1313 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1314 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1315 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1316 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1317 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1318
1319 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1320 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1321
1322 // Oop encoding heap max
1323 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1324
1325 #if INCLUDE_ALL_GCS
1326 // Set CMS global values
1327 CompactibleFreeListSpace::set_cms_values();
1328 #endif // INCLUDE_ALL_GCS
1329 }
1330
1331 bool verify_object_alignment() {
1332 // Object alignment.
1333 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1334 jio_fprintf(defaultStream::error_stream(),
1335 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1336 (int)ObjectAlignmentInBytes);
1337 return false;
1338 }
1339 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1340 jio_fprintf(defaultStream::error_stream(),
1341 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1342 (int)ObjectAlignmentInBytes, BytesPerLong);
1343 return false;
1344 }
1345 // It does not make sense to have big object alignment
1346 // since a space lost due to alignment will be greater
1347 // then a saved space from compressed oops.
1348 if ((int)ObjectAlignmentInBytes > 256) {
1349 jio_fprintf(defaultStream::error_stream(),
1350 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1351 (int)ObjectAlignmentInBytes);
1352 return false;
1353 }
1354 // In case page size is very small.
1355 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1356 jio_fprintf(defaultStream::error_stream(),
1357 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1358 (int)ObjectAlignmentInBytes, os::vm_page_size());
1359 return false;
1360 }
1361 return true;
1362 }
1363
1364 inline uintx max_heap_for_compressed_oops() {
1365 // Avoid sign flip.
1366 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) {
1367 return 0;
1368 }
1369 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size());
1370 NOT_LP64(ShouldNotReachHere(); return 0);
1371 }
1372
1373 bool Arguments::should_auto_select_low_pause_collector() {
1374 if (UseAutoGCSelectPolicy &&
1375 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1376 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1377 if (PrintGCDetails) {
1378 // Cannot use gclog_or_tty yet.
1379 tty->print_cr("Automatic selection of the low pause collector"
1380 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1381 }
1382 return true;
1383 }
1384 return false;
1385 }
1386
1387 void Arguments::set_use_compressed_oops() {
1388 #ifndef ZERO
1389 #ifdef _LP64
1390 // MaxHeapSize is not set up properly at this point, but
1391 // the only value that can override MaxHeapSize if we are
1392 // to use UseCompressedOops is InitialHeapSize.
1393 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1394
1395 if (max_heap_size <= max_heap_for_compressed_oops()) {
1396 #if !defined(COMPILER1) || defined(TIERED)
1397 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1398 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1399 }
1400 #endif
1401 #ifdef _WIN64
1402 if (UseLargePages && UseCompressedOops) {
1403 // Cannot allocate guard pages for implicit checks in indexed addressing
1404 // mode, when large pages are specified on windows.
1405 // This flag could be switched ON if narrow oop base address is set to 0,
1406 // see code in Universe::initialize_heap().
1407 Universe::set_narrow_oop_use_implicit_null_checks(false);
1408 }
1409 #endif // _WIN64
1410 } else {
1411 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1412 warning("Max heap size too large for Compressed Oops");
1413 FLAG_SET_DEFAULT(UseCompressedOops, false);
1414 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1415 }
1416 }
1417 #endif // _LP64
1418 #endif // ZERO
1419 }
1420
1421 void Arguments::set_ergonomics_flags() {
1422
1423 if (os::is_server_class_machine()) {
1424 // If no other collector is requested explicitly,
1425 // let the VM select the collector based on
1426 // machine class and automatic selection policy.
1427 if (!UseSerialGC &&
1428 !UseConcMarkSweepGC &&
1429 !UseG1GC &&
1430 !UseParNewGC &&
1431 FLAG_IS_DEFAULT(UseParallelGC)) {
1432 if (should_auto_select_low_pause_collector()) {
1433 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1434 } else {
1435 FLAG_SET_ERGO(bool, UseParallelGC, true);
1436 }
1437 }
1438 // Shared spaces work fine with other GCs but causes bytecode rewriting
1439 // to be disabled, which hurts interpreter performance and decreases
1440 // server performance. On server class machines, keep the default
1441 // off unless it is asked for. Future work: either add bytecode rewriting
1442 // at link time, or rewrite bytecodes in non-shared methods.
1443 if (!DumpSharedSpaces && !RequireSharedSpaces) {
1444 no_shared_spaces();
1445 }
1446 }
1447
1448 #ifndef ZERO
1449 #ifdef _LP64
1450 set_use_compressed_oops();
1451 // UseCompressedOops must be on for UseCompressedKlassPointers to be on.
1452 if (!UseCompressedOops) {
1453 if (UseCompressedKlassPointers) {
1454 warning("UseCompressedKlassPointers requires UseCompressedOops");
1455 }
1456 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1457 } else {
1458 // Turn on UseCompressedKlassPointers too
1459 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) {
1460 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true);
1461 }
1462 // Set the ClassMetaspaceSize to something that will not need to be
1463 // expanded, since it cannot be expanded.
1464 if (UseCompressedKlassPointers) {
1465 if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) {
1466 warning("Class metaspace size is too large for UseCompressedKlassPointers");
1467 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1468 } else if (FLAG_IS_DEFAULT(ClassMetaspaceSize)) {
1469 // 100,000 classes seems like a good size, so 100M assumes around 1K
1470 // per klass. The vtable and oopMap is embedded so we don't have a fixed
1471 // size per klass. Eventually, this will be parameterized because it
1472 // would also be useful to determine the optimal size of the
1473 // systemDictionary.
1474 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M);
1475 }
1476 }
1477 }
1478 // Also checks that certain machines are slower with compressed oops
1479 // in vm_version initialization code.
1480 #endif // _LP64
1481 #endif // !ZERO
1482 }
1483
1484 void Arguments::set_parallel_gc_flags() {
1485 assert(UseParallelGC || UseParallelOldGC, "Error");
1486 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1487 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1488 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1489 }
1490 FLAG_SET_DEFAULT(UseParallelGC, true);
1491
1492 // If no heap maximum was requested explicitly, use some reasonable fraction
1493 // of the physical memory, up to a maximum of 1GB.
1494 FLAG_SET_DEFAULT(ParallelGCThreads,
1495 Abstract_VM_Version::parallel_worker_threads());
1496 if (ParallelGCThreads == 0) {
1497 jio_fprintf(defaultStream::error_stream(),
1498 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1499 vm_exit(1);
1500 }
1501
1502
1503 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1504 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1505 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1506 // See CR 6362902 for details.
1507 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1508 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1509 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1510 }
1511 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1512 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1513 }
1514 }
1515
1516 if (UseParallelOldGC) {
1517 // Par compact uses lower default values since they are treated as
1518 // minimums. These are different defaults because of the different
1519 // interpretation and are not ergonomically set.
1520 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1521 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1522 }
1523 }
1524 }
1525
1526 void Arguments::set_g1_gc_flags() {
1527 assert(UseG1GC, "Error");
1528 #ifdef COMPILER1
1529 FastTLABRefill = false;
1530 #endif
1531 FLAG_SET_DEFAULT(ParallelGCThreads,
1532 Abstract_VM_Version::parallel_worker_threads());
1533 if (ParallelGCThreads == 0) {
1534 FLAG_SET_DEFAULT(ParallelGCThreads,
1535 Abstract_VM_Version::parallel_worker_threads());
1536 }
1537
1538 // MarkStackSize will be set (if it hasn't been set by the user)
1539 // when concurrent marking is initialized.
1540 // Its value will be based upon the number of parallel marking threads.
1541 // But we do set the maximum mark stack size here.
1542 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1543 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1544 }
1545
1546 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1547 // In G1, we want the default GC overhead goal to be higher than
1548 // say in PS. So we set it here to 10%. Otherwise the heap might
1549 // be expanded more aggressively than we would like it to. In
1550 // fact, even 10% seems to not be high enough in some cases
1551 // (especially small GC stress tests that the main thing they do
1552 // is allocation). We might consider increase it further.
1553 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1554 }
1555
1556 if (PrintGCDetails && Verbose) {
1557 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1558 MarkStackSize / K, MarkStackSizeMax / K);
1559 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1560 }
1561 }
1562
1563 julong Arguments::limit_by_allocatable_memory(julong limit) {
1564 julong max_allocatable;
1565 julong result = limit;
1566 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1567 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1568 }
1569 return result;
1570 }
1571
1572 void Arguments::set_heap_base_min_address() {
1573 if (FLAG_IS_DEFAULT(HeapBaseMinAddress) && UseG1GC && HeapBaseMinAddress < 1*G) {
1574 // By default HeapBaseMinAddress is 2G on all platforms except Solaris x86.
1575 // G1 currently needs a lot of C-heap, so on Solaris we have to give G1
1576 // some extra space for the C-heap compared to other collectors.
1577 // Use FLAG_SET_DEFAULT here rather than FLAG_SET_ERGO to make sure that
1578 // code that checks for default values work correctly.
1579 FLAG_SET_DEFAULT(HeapBaseMinAddress, 1*G);
1580 }
1581 }
1582
1583 void Arguments::set_heap_size() {
1584 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1585 // Deprecated flag
1586 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1587 }
1588
1589 const julong phys_mem =
1590 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1591 : (julong)MaxRAM;
1592
1593 // If the maximum heap size has not been set with -Xmx,
1594 // then set it as fraction of the size of physical memory,
1595 // respecting the maximum and minimum sizes of the heap.
1596 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1597 julong reasonable_max = phys_mem / MaxRAMFraction;
1598
1599 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1600 // Small physical memory, so use a minimum fraction of it for the heap
1601 reasonable_max = phys_mem / MinRAMFraction;
1602 } else {
1603 // Not-small physical memory, so require a heap at least
1604 // as large as MaxHeapSize
1605 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1606 }
1607 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1608 // Limit the heap size to ErgoHeapSizeLimit
1609 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1610 }
1611 if (UseCompressedOops) {
1612 // Limit the heap size to the maximum possible when using compressed oops
1613 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1614 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1615 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1616 // but it should be not less than default MaxHeapSize.
1617 max_coop_heap -= HeapBaseMinAddress;
1618 }
1619 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1620 }
1621 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1622
1623 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1624 // An initial heap size was specified on the command line,
1625 // so be sure that the maximum size is consistent. Done
1626 // after call to limit_by_allocatable_memory because that
1627 // method might reduce the allocation size.
1628 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1629 }
1630
1631 if (PrintGCDetails && Verbose) {
1632 // Cannot use gclog_or_tty yet.
1633 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1634 }
1635 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1636 }
1637
1638 // If the minimum or initial heap_size have not been set or requested to be set
1639 // ergonomically, set them accordingly.
1640 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1641 julong reasonable_minimum = (julong)(OldSize + NewSize);
1642
1643 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1644
1645 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1646
1647 if (InitialHeapSize == 0) {
1648 julong reasonable_initial = phys_mem / InitialRAMFraction;
1649
1650 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1651 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1652
1653 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1654
1655 if (PrintGCDetails && Verbose) {
1656 // Cannot use gclog_or_tty yet.
1657 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1658 }
1659 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1660 }
1661 // If the minimum heap size has not been set (via -Xms),
1662 // synchronize with InitialHeapSize to avoid errors with the default value.
1663 if (min_heap_size() == 0) {
1664 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1665 if (PrintGCDetails && Verbose) {
1666 // Cannot use gclog_or_tty yet.
1667 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1668 }
1669 }
1670 }
1671 }
1672
1673 // This must be called after ergonomics because we want bytecode rewriting
1674 // if the server compiler is used, or if UseSharedSpaces is disabled.
1675 void Arguments::set_bytecode_flags() {
1676 // Better not attempt to store into a read-only space.
1677 if (UseSharedSpaces) {
1678 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1679 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1680 }
1681
1682 if (!RewriteBytecodes) {
1683 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1684 }
1685 }
1686
1687 // Aggressive optimization flags -XX:+AggressiveOpts
1688 void Arguments::set_aggressive_opts_flags() {
1689 #ifdef COMPILER2
1690 if (AggressiveUnboxing) {
1691 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1692 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1693 } else if (!EliminateAutoBox) {
1694 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1695 AggressiveUnboxing = false;
1696 }
1697 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1698 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1699 } else if (!DoEscapeAnalysis) {
1700 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1701 AggressiveUnboxing = false;
1702 }
1703 }
1704 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1705 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1706 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1707 }
1708 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1709 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1710 }
1711
1712 // Feed the cache size setting into the JDK
1713 char buffer[1024];
1714 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1715 add_property(buffer);
1716 }
1717 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1718 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1719 }
1720 #endif
1721
1722 if (AggressiveOpts) {
1723 // Sample flag setting code
1724 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1725 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1726 // }
1727 }
1728 }
1729
1730 //===========================================================================================================
1731 // Parsing of java.compiler property
1732
1733 void Arguments::process_java_compiler_argument(char* arg) {
1734 // For backwards compatibility, Djava.compiler=NONE or ""
1735 // causes us to switch to -Xint mode UNLESS -Xdebug
1736 // is also specified.
1737 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1738 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1739 }
1740 }
1741
1742 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1743 _sun_java_launcher = strdup(launcher);
1744 if (strcmp("gamma", _sun_java_launcher) == 0) {
1745 _created_by_gamma_launcher = true;
1746 }
1747 }
1748
1749 bool Arguments::created_by_java_launcher() {
1750 assert(_sun_java_launcher != NULL, "property must have value");
1751 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1752 }
1753
1754 bool Arguments::created_by_gamma_launcher() {
1755 return _created_by_gamma_launcher;
1756 }
1757
1758 //===========================================================================================================
1759 // Parsing of main arguments
1760
1761 bool Arguments::verify_interval(uintx val, uintx min,
1762 uintx max, const char* name) {
1763 // Returns true iff value is in the inclusive interval [min..max]
1764 // false, otherwise.
1765 if (val >= min && val <= max) {
1766 return true;
1767 }
1768 jio_fprintf(defaultStream::error_stream(),
1769 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1770 " and " UINTX_FORMAT "\n",
1771 name, val, min, max);
1772 return false;
1773 }
1774
1775 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1776 // Returns true if given value is at least specified min threshold
1777 // false, otherwise.
1778 if (val >= min ) {
1779 return true;
1780 }
1781 jio_fprintf(defaultStream::error_stream(),
1782 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1783 name, val, min);
1784 return false;
1785 }
1786
1787 bool Arguments::verify_percentage(uintx value, const char* name) {
1788 if (value <= 100) {
1789 return true;
1790 }
1791 jio_fprintf(defaultStream::error_stream(),
1792 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1793 name, value);
1794 return false;
1795 }
1796
1797 #if !INCLUDE_ALL_GCS
1798 #ifdef ASSERT
1799 static bool verify_serial_gc_flags() {
1800 return (UseSerialGC &&
1801 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1802 UseParallelGC || UseParallelOldGC));
1803 }
1804 #endif // ASSERT
1805 #endif // INCLUDE_ALL_GCS
1806
1807 // check if do gclog rotation
1808 // +UseGCLogFileRotation is a must,
1809 // no gc log rotation when log file not supplied or
1810 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1811 void check_gclog_consistency() {
1812 if (UseGCLogFileRotation) {
1813 if ((Arguments::gc_log_filename() == NULL) ||
1814 (NumberOfGCLogFiles == 0) ||
1815 (GCLogFileSize == 0)) {
1816 jio_fprintf(defaultStream::output_stream(),
1817 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1818 "where num_of_file > 0 and num_of_size > 0\n"
1819 "GC log rotation is turned off\n");
1820 UseGCLogFileRotation = false;
1821 }
1822 }
1823
1824 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1825 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1826 jio_fprintf(defaultStream::output_stream(),
1827 "GCLogFileSize changed to minimum 8K\n");
1828 }
1829 }
1830
1831 // Check consistency of GC selection
1832 bool Arguments::check_gc_consistency() {
1833 check_gclog_consistency();
1834 bool status = true;
1835 // Ensure that the user has not selected conflicting sets
1836 // of collectors. [Note: this check is merely a user convenience;
1837 // collectors over-ride each other so that only a non-conflicting
1838 // set is selected; however what the user gets is not what they
1839 // may have expected from the combination they asked for. It's
1840 // better to reduce user confusion by not allowing them to
1841 // select conflicting combinations.
1842 uint i = 0;
1843 if (UseSerialGC) i++;
1844 if (UseConcMarkSweepGC || UseParNewGC) i++;
1845 if (UseParallelGC || UseParallelOldGC) i++;
1846 if (UseG1GC) i++;
1847 if (i > 1) {
1848 jio_fprintf(defaultStream::error_stream(),
1849 "Conflicting collector combinations in option list; "
1850 "please refer to the release notes for the combinations "
1851 "allowed\n");
1852 status = false;
1853 }
1854
1855 return status;
1856 }
1857
1858 void Arguments::check_deprecated_gcs() {
1859 if (UseConcMarkSweepGC && !UseParNewGC) {
1860 warning("Using the DefNew young collector with the CMS collector is deprecated "
1861 "and will likely be removed in a future release");
1862 }
1863
1864 if (UseParNewGC && !UseConcMarkSweepGC) {
1865 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1866 // set up UseSerialGC properly, so that can't be used in the check here.
1867 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1868 "and will likely be removed in a future release");
1869 }
1870
1871 if (CMSIncrementalMode) {
1872 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1873 }
1874 }
1875
1876 void Arguments::check_deprecated_gc_flags() {
1877 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
1878 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
1879 "and will likely be removed in future release");
1880 }
1881 }
1882
1883 // Check stack pages settings
1884 bool Arguments::check_stack_pages()
1885 {
1886 bool status = true;
1887 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1888 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1889 // greater stack shadow pages can't generate instruction to bang stack
1890 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1891 return status;
1892 }
1893
1894 // Check the consistency of vm_init_args
1895 bool Arguments::check_vm_args_consistency() {
1896 // Method for adding checks for flag consistency.
1897 // The intent is to warn the user of all possible conflicts,
1898 // before returning an error.
1899 // Note: Needs platform-dependent factoring.
1900 bool status = true;
1901
1902 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1903 // builds so the cost of stack banging can be measured.
1904 #if (defined(PRODUCT) && defined(SOLARIS))
1905 if (!UseBoundThreads && !UseStackBanging) {
1906 jio_fprintf(defaultStream::error_stream(),
1907 "-UseStackBanging conflicts with -UseBoundThreads\n");
1908
1909 status = false;
1910 }
1911 #endif
1912
1913 if (TLABRefillWasteFraction == 0) {
1914 jio_fprintf(defaultStream::error_stream(),
1915 "TLABRefillWasteFraction should be a denominator, "
1916 "not " SIZE_FORMAT "\n",
1917 TLABRefillWasteFraction);
1918 status = false;
1919 }
1920
1921 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
1922 "AdaptiveSizePolicyWeight");
1923 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1924 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1925 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1926
1927 // Divide by bucket size to prevent a large size from causing rollover when
1928 // calculating amount of memory needed to be allocated for the String table.
1929 status = status && verify_interval(StringTableSize, minimumStringTableSize,
1930 (max_uintx / StringTable::bucket_size()), "StringTable size");
1931
1932 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1933 jio_fprintf(defaultStream::error_stream(),
1934 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1935 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1936 MinHeapFreeRatio, MaxHeapFreeRatio);
1937 status = false;
1938 }
1939 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1940 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1941
1942 // Min/MaxMetaspaceFreeRatio
1943 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
1944 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
1945
1946 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
1947 jio_fprintf(defaultStream::error_stream(),
1948 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
1949 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
1950 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
1951 MinMetaspaceFreeRatio,
1952 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
1953 MaxMetaspaceFreeRatio);
1954 status = false;
1955 }
1956
1957 // Trying to keep 100% free is not practical
1958 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
1959
1960 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1961 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1962 }
1963
1964 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1965 // Settings to encourage splitting.
1966 if (!FLAG_IS_CMDLINE(NewRatio)) {
1967 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
1968 }
1969 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1970 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1971 }
1972 }
1973
1974 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1975 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1976 if (GCTimeLimit == 100) {
1977 // Turn off gc-overhead-limit-exceeded checks
1978 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1979 }
1980
1981 status = status && check_gc_consistency();
1982 status = status && check_stack_pages();
1983
1984 if (_has_alloc_profile) {
1985 if (UseParallelGC || UseParallelOldGC) {
1986 jio_fprintf(defaultStream::error_stream(),
1987 "error: invalid argument combination.\n"
1988 "Allocation profiling (-Xaprof) cannot be used together with "
1989 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1990 status = false;
1991 }
1992 if (UseConcMarkSweepGC) {
1993 jio_fprintf(defaultStream::error_stream(),
1994 "error: invalid argument combination.\n"
1995 "Allocation profiling (-Xaprof) cannot be used together with "
1996 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1997 status = false;
1998 }
1999 }
2000
2001 if (CMSIncrementalMode) {
2002 if (!UseConcMarkSweepGC) {
2003 jio_fprintf(defaultStream::error_stream(),
2004 "error: invalid argument combination.\n"
2005 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2006 "selected in order\nto use CMSIncrementalMode.\n");
2007 status = false;
2008 } else {
2009 status = status && verify_percentage(CMSIncrementalDutyCycle,
2010 "CMSIncrementalDutyCycle");
2011 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2012 "CMSIncrementalDutyCycleMin");
2013 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2014 "CMSIncrementalSafetyFactor");
2015 status = status && verify_percentage(CMSIncrementalOffset,
2016 "CMSIncrementalOffset");
2017 status = status && verify_percentage(CMSExpAvgFactor,
2018 "CMSExpAvgFactor");
2019 // If it was not set on the command line, set
2020 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2021 if (CMSInitiatingOccupancyFraction < 0) {
2022 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2023 }
2024 }
2025 }
2026
2027 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2028 // insists that we hold the requisite locks so that the iteration is
2029 // MT-safe. For the verification at start-up and shut-down, we don't
2030 // yet have a good way of acquiring and releasing these locks,
2031 // which are not visible at the CollectedHeap level. We want to
2032 // be able to acquire these locks and then do the iteration rather
2033 // than just disable the lock verification. This will be fixed under
2034 // bug 4788986.
2035 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2036 if (VerifyDuringStartup) {
2037 warning("Heap verification at start-up disabled "
2038 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2039 VerifyDuringStartup = false; // Disable verification at start-up
2040 }
2041
2042 if (VerifyBeforeExit) {
2043 warning("Heap verification at shutdown disabled "
2044 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2045 VerifyBeforeExit = false; // Disable verification at shutdown
2046 }
2047 }
2048
2049 // Note: only executed in non-PRODUCT mode
2050 if (!UseAsyncConcMarkSweepGC &&
2051 (ExplicitGCInvokesConcurrent ||
2052 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2053 jio_fprintf(defaultStream::error_stream(),
2054 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2055 " with -UseAsyncConcMarkSweepGC");
2056 status = false;
2057 }
2058
2059 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2060
2061 #if INCLUDE_ALL_GCS
2062 if (UseG1GC) {
2063 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2064 "InitiatingHeapOccupancyPercent");
2065 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2066 "G1RefProcDrainInterval");
2067 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2068 "G1ConcMarkStepDurationMillis");
2069 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2070 "G1ConcRSHotCardLimit");
2071 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2072 "G1ConcRSLogCacheSize");
2073 }
2074 if (UseConcMarkSweepGC) {
2075 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2076 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2077 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2078 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2079
2080 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2081
2082 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2083 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2084 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2085
2086 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2087
2088 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2089 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2090
2091 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2092 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2093 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2094
2095 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2096
2097 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2098
2099 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2100 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2101 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2102 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2103 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2104 }
2105
2106 if (UseParallelGC || UseParallelOldGC) {
2107 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2108 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2109
2110 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2111 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2112
2113 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2114 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2115
2116 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2117
2118 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2119 }
2120 #endif // INCLUDE_ALL_GCS
2121
2122 status = status && verify_interval(RefDiscoveryPolicy,
2123 ReferenceProcessor::DiscoveryPolicyMin,
2124 ReferenceProcessor::DiscoveryPolicyMax,
2125 "RefDiscoveryPolicy");
2126
2127 // Limit the lower bound of this flag to 1 as it is used in a division
2128 // expression.
2129 status = status && verify_interval(TLABWasteTargetPercent,
2130 1, 100, "TLABWasteTargetPercent");
2131
2132 status = status && verify_object_alignment();
2133
2134 status = status && verify_min_value(ClassMetaspaceSize, 1*M,
2135 "ClassMetaspaceSize");
2136
2137 status = status && verify_interval(MarkStackSizeMax,
2138 1, (max_jint - 1), "MarkStackSizeMax");
2139 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2140
2141 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2142
2143 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2144
2145 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2146
2147 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2148 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2149
2150 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2151
2152 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2153 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2154 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2155 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2156
2157 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2158 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2159
2160 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2161 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2162 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2163
2164 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2165 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2166
2167 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2168 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2169 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2170 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2171
2172 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2173 #ifdef SPARC
2174 if (UseConcMarkSweepGC || UseG1GC) {
2175 // Issue a stern warning if the user has explicitly set
2176 // UseMemSetInBOT (it is known to cause issues), but allow
2177 // use for experimentation and debugging.
2178 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2179 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2180 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2181 " on sun4v; please understand that you are using at your own risk!");
2182 }
2183 }
2184 #endif // SPARC
2185
2186 if (PrintNMTStatistics) {
2187 #if INCLUDE_NMT
2188 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2189 #endif // INCLUDE_NMT
2190 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2191 PrintNMTStatistics = false;
2192 #if INCLUDE_NMT
2193 }
2194 #endif
2195 }
2196
2197 // Need to limit the extent of the padding to reasonable size.
2198 // 8K is well beyond the reasonable HW cache line size, even with the
2199 // aggressive prefetching, while still leaving the room for segregating
2200 // among the distinct pages.
2201 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2202 jio_fprintf(defaultStream::error_stream(),
2203 "ContendedPaddingWidth=" INTX_FORMAT " must be the between %d and %d\n",
2204 ContendedPaddingWidth, 0, 8192);
2205 status = false;
2206 }
2207
2208 // Need to enforce the padding not to break the existing field alignments.
2209 // It is sufficient to check against the largest type size.
2210 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2211 jio_fprintf(defaultStream::error_stream(),
2212 "ContendedPaddingWidth=" INTX_FORMAT " must be the multiple of %d\n",
2213 ContendedPaddingWidth, BytesPerLong);
2214 status = false;
2215 }
2216
2217 if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2218 jio_fprintf(defaultStream::error_stream(),
2219 "Invalid ReservedCodeCacheSize: %dK. Should be greater than InitialCodeCacheSize=%dK\n",
2220 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2221 status = false;
2222 }
2223
2224 return status;
2225 }
2226
2227 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2228 const char* option_type) {
2229 if (ignore) return false;
2230
2231 const char* spacer = " ";
2232 if (option_type == NULL) {
2233 option_type = ++spacer; // Set both to the empty string.
2234 }
2235
2236 if (os::obsolete_option(option)) {
2237 jio_fprintf(defaultStream::error_stream(),
2238 "Obsolete %s%soption: %s\n", option_type, spacer,
2239 option->optionString);
2240 return false;
2241 } else {
2242 jio_fprintf(defaultStream::error_stream(),
2243 "Unrecognized %s%soption: %s\n", option_type, spacer,
2244 option->optionString);
2245 return true;
2246 }
2247 }
2248
2249 static const char* user_assertion_options[] = {
2250 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2251 };
2252
2253 static const char* system_assertion_options[] = {
2254 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2255 };
2256
2257 // Return true if any of the strings in null-terminated array 'names' matches.
2258 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2259 // the option must match exactly.
2260 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2261 bool tail_allowed) {
2262 for (/* empty */; *names != NULL; ++names) {
2263 if (match_option(option, *names, tail)) {
2264 if (**tail == '\0' || tail_allowed && **tail == ':') {
2265 return true;
2266 }
2267 }
2268 }
2269 return false;
2270 }
2271
2272 bool Arguments::parse_uintx(const char* value,
2273 uintx* uintx_arg,
2274 uintx min_size) {
2275
2276 // Check the sign first since atomull() parses only unsigned values.
2277 bool value_is_positive = !(*value == '-');
2278
2279 if (value_is_positive) {
2280 julong n;
2281 bool good_return = atomull(value, &n);
2282 if (good_return) {
2283 bool above_minimum = n >= min_size;
2284 bool value_is_too_large = n > max_uintx;
2285
2286 if (above_minimum && !value_is_too_large) {
2287 *uintx_arg = n;
2288 return true;
2289 }
2290 }
2291 }
2292 return false;
2293 }
2294
2295 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2296 julong* long_arg,
2297 julong min_size) {
2298 if (!atomull(s, long_arg)) return arg_unreadable;
2299 return check_memory_size(*long_arg, min_size);
2300 }
2301
2302 // Parse JavaVMInitArgs structure
2303
2304 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2305 // For components of the system classpath.
2306 SysClassPath scp(Arguments::get_sysclasspath());
2307 bool scp_assembly_required = false;
2308
2309 // Save default settings for some mode flags
2310 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2311 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2312 Arguments::_ClipInlining = ClipInlining;
2313 Arguments::_BackgroundCompilation = BackgroundCompilation;
2314
2315 // Setup flags for mixed which is the default
2316 set_mode_flags(_mixed);
2317
2318 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2319 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2320 if (result != JNI_OK) {
2321 return result;
2322 }
2323
2324 // Parse JavaVMInitArgs structure passed in
2325 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2326 if (result != JNI_OK) {
2327 return result;
2328 }
2329
2330 if (AggressiveOpts) {
2331 // Insert alt-rt.jar between user-specified bootclasspath
2332 // prefix and the default bootclasspath. os::set_boot_path()
2333 // uses meta_index_dir as the default bootclasspath directory.
2334 const char* altclasses_jar = "alt-rt.jar";
2335 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2336 strlen(altclasses_jar);
2337 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2338 strcpy(altclasses_path, get_meta_index_dir());
2339 strcat(altclasses_path, altclasses_jar);
2340 scp.add_suffix_to_prefix(altclasses_path);
2341 scp_assembly_required = true;
2342 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2343 }
2344
2345 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2346 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2347 if (result != JNI_OK) {
2348 return result;
2349 }
2350
2351 // Do final processing now that all arguments have been parsed
2352 result = finalize_vm_init_args(&scp, scp_assembly_required);
2353 if (result != JNI_OK) {
2354 return result;
2355 }
2356
2357 return JNI_OK;
2358 }
2359
2360 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2361 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2362 // are dealing with -agentpath (case where name is a path), otherwise with
2363 // -agentlib
2364 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2365 char *_name;
2366 const char *_hprof = "hprof", *_jdwp = "jdwp";
2367 size_t _len_hprof, _len_jdwp, _len_prefix;
2368
2369 if (is_path) {
2370 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2371 return false;
2372 }
2373
2374 _name++; // skip past last path separator
2375 _len_prefix = strlen(JNI_LIB_PREFIX);
2376
2377 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2378 return false;
2379 }
2380
2381 _name += _len_prefix;
2382 _len_hprof = strlen(_hprof);
2383 _len_jdwp = strlen(_jdwp);
2384
2385 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2386 _name += _len_hprof;
2387 }
2388 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2389 _name += _len_jdwp;
2390 }
2391 else {
2392 return false;
2393 }
2394
2395 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2396 return false;
2397 }
2398
2399 return true;
2400 }
2401
2402 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2403 return true;
2404 }
2405
2406 return false;
2407 }
2408
2409 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2410 SysClassPath* scp_p,
2411 bool* scp_assembly_required_p,
2412 FlagValueOrigin origin) {
2413 // Remaining part of option string
2414 const char* tail;
2415
2416 // iterate over arguments
2417 for (int index = 0; index < args->nOptions; index++) {
2418 bool is_absolute_path = false; // for -agentpath vs -agentlib
2419
2420 const JavaVMOption* option = args->options + index;
2421
2422 if (!match_option(option, "-Djava.class.path", &tail) &&
2423 !match_option(option, "-Dsun.java.command", &tail) &&
2424 !match_option(option, "-Dsun.java.launcher", &tail)) {
2425
2426 // add all jvm options to the jvm_args string. This string
2427 // is used later to set the java.vm.args PerfData string constant.
2428 // the -Djava.class.path and the -Dsun.java.command options are
2429 // omitted from jvm_args string as each have their own PerfData
2430 // string constant object.
2431 build_jvm_args(option->optionString);
2432 }
2433
2434 // -verbose:[class/gc/jni]
2435 if (match_option(option, "-verbose", &tail)) {
2436 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2437 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2438 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2439 } else if (!strcmp(tail, ":gc")) {
2440 FLAG_SET_CMDLINE(bool, PrintGC, true);
2441 } else if (!strcmp(tail, ":jni")) {
2442 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2443 }
2444 // -da / -ea / -disableassertions / -enableassertions
2445 // These accept an optional class/package name separated by a colon, e.g.,
2446 // -da:java.lang.Thread.
2447 } else if (match_option(option, user_assertion_options, &tail, true)) {
2448 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2449 if (*tail == '\0') {
2450 JavaAssertions::setUserClassDefault(enable);
2451 } else {
2452 assert(*tail == ':', "bogus match by match_option()");
2453 JavaAssertions::addOption(tail + 1, enable);
2454 }
2455 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2456 } else if (match_option(option, system_assertion_options, &tail, false)) {
2457 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2458 JavaAssertions::setSystemClassDefault(enable);
2459 // -bootclasspath:
2460 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2461 scp_p->reset_path(tail);
2462 *scp_assembly_required_p = true;
2463 // -bootclasspath/a:
2464 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2465 scp_p->add_suffix(tail);
2466 *scp_assembly_required_p = true;
2467 // -bootclasspath/p:
2468 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2469 scp_p->add_prefix(tail);
2470 *scp_assembly_required_p = true;
2471 // -Xrun
2472 } else if (match_option(option, "-Xrun", &tail)) {
2473 if (tail != NULL) {
2474 const char* pos = strchr(tail, ':');
2475 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2476 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2477 name[len] = '\0';
2478
2479 char *options = NULL;
2480 if(pos != NULL) {
2481 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2482 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2483 }
2484 #if !INCLUDE_JVMTI
2485 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2486 jio_fprintf(defaultStream::error_stream(),
2487 "Profiling and debugging agents are not supported in this VM\n");
2488 return JNI_ERR;
2489 }
2490 #endif // !INCLUDE_JVMTI
2491 add_init_library(name, options);
2492 }
2493 // -agentlib and -agentpath
2494 } else if (match_option(option, "-agentlib:", &tail) ||
2495 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2496 if(tail != NULL) {
2497 const char* pos = strchr(tail, '=');
2498 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2499 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2500 name[len] = '\0';
2501
2502 char *options = NULL;
2503 if(pos != NULL) {
2504 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2505 }
2506 #if !INCLUDE_JVMTI
2507 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2508 jio_fprintf(defaultStream::error_stream(),
2509 "Profiling and debugging agents are not supported in this VM\n");
2510 return JNI_ERR;
2511 }
2512 #endif // !INCLUDE_JVMTI
2513 add_init_agent(name, options, is_absolute_path);
2514 }
2515 // -javaagent
2516 } else if (match_option(option, "-javaagent:", &tail)) {
2517 #if !INCLUDE_JVMTI
2518 jio_fprintf(defaultStream::error_stream(),
2519 "Instrumentation agents are not supported in this VM\n");
2520 return JNI_ERR;
2521 #else
2522 if(tail != NULL) {
2523 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2524 add_init_agent("instrument", options, false);
2525 }
2526 #endif // !INCLUDE_JVMTI
2527 // -Xnoclassgc
2528 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2529 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2530 // -Xincgc: i-CMS
2531 } else if (match_option(option, "-Xincgc", &tail)) {
2532 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2533 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2534 // -Xnoincgc: no i-CMS
2535 } else if (match_option(option, "-Xnoincgc", &tail)) {
2536 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2537 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2538 // -Xconcgc
2539 } else if (match_option(option, "-Xconcgc", &tail)) {
2540 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2541 // -Xnoconcgc
2542 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2543 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2544 // -Xbatch
2545 } else if (match_option(option, "-Xbatch", &tail)) {
2546 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2547 // -Xmn for compatibility with other JVM vendors
2548 } else if (match_option(option, "-Xmn", &tail)) {
2549 julong long_initial_eden_size = 0;
2550 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2551 if (errcode != arg_in_range) {
2552 jio_fprintf(defaultStream::error_stream(),
2553 "Invalid initial eden size: %s\n", option->optionString);
2554 describe_range_error(errcode);
2555 return JNI_EINVAL;
2556 }
2557 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2558 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2559 // -Xms
2560 } else if (match_option(option, "-Xms", &tail)) {
2561 julong long_initial_heap_size = 0;
2562 // an initial heap size of 0 means automatically determine
2563 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2564 if (errcode != arg_in_range) {
2565 jio_fprintf(defaultStream::error_stream(),
2566 "Invalid initial heap size: %s\n", option->optionString);
2567 describe_range_error(errcode);
2568 return JNI_EINVAL;
2569 }
2570 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2571 // Currently the minimum size and the initial heap sizes are the same.
2572 set_min_heap_size(InitialHeapSize);
2573 // -Xmx
2574 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2575 julong long_max_heap_size = 0;
2576 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2577 if (errcode != arg_in_range) {
2578 jio_fprintf(defaultStream::error_stream(),
2579 "Invalid maximum heap size: %s\n", option->optionString);
2580 describe_range_error(errcode);
2581 return JNI_EINVAL;
2582 }
2583 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2584 // Xmaxf
2585 } else if (match_option(option, "-Xmaxf", &tail)) {
2586 int maxf = (int)(atof(tail) * 100);
2587 if (maxf < 0 || maxf > 100) {
2588 jio_fprintf(defaultStream::error_stream(),
2589 "Bad max heap free percentage size: %s\n",
2590 option->optionString);
2591 return JNI_EINVAL;
2592 } else {
2593 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2594 }
2595 // Xminf
2596 } else if (match_option(option, "-Xminf", &tail)) {
2597 int minf = (int)(atof(tail) * 100);
2598 if (minf < 0 || minf > 100) {
2599 jio_fprintf(defaultStream::error_stream(),
2600 "Bad min heap free percentage size: %s\n",
2601 option->optionString);
2602 return JNI_EINVAL;
2603 } else {
2604 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2605 }
2606 // -Xss
2607 } else if (match_option(option, "-Xss", &tail)) {
2608 julong long_ThreadStackSize = 0;
2609 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2610 if (errcode != arg_in_range) {
2611 jio_fprintf(defaultStream::error_stream(),
2612 "Invalid thread stack size: %s\n", option->optionString);
2613 describe_range_error(errcode);
2614 return JNI_EINVAL;
2615 }
2616 // Internally track ThreadStackSize in units of 1024 bytes.
2617 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2618 round_to((int)long_ThreadStackSize, K) / K);
2619 // -Xoss
2620 } else if (match_option(option, "-Xoss", &tail)) {
2621 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2622 // -Xmaxjitcodesize
2623 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2624 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2625 julong long_ReservedCodeCacheSize = 0;
2626 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2627 if (errcode != arg_in_range) {
2628 jio_fprintf(defaultStream::error_stream(),
2629 "Invalid maximum code cache size: %s.\n", option->optionString);
2630 return JNI_EINVAL;
2631 }
2632 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2633 //-XX:IncreaseFirstTierCompileThresholdAt=
2634 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2635 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2636 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2637 jio_fprintf(defaultStream::error_stream(),
2638 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2639 option->optionString);
2640 return JNI_EINVAL;
2641 }
2642 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2643 // -green
2644 } else if (match_option(option, "-green", &tail)) {
2645 jio_fprintf(defaultStream::error_stream(),
2646 "Green threads support not available\n");
2647 return JNI_EINVAL;
2648 // -native
2649 } else if (match_option(option, "-native", &tail)) {
2650 // HotSpot always uses native threads, ignore silently for compatibility
2651 // -Xsqnopause
2652 } else if (match_option(option, "-Xsqnopause", &tail)) {
2653 // EVM option, ignore silently for compatibility
2654 // -Xrs
2655 } else if (match_option(option, "-Xrs", &tail)) {
2656 // Classic/EVM option, new functionality
2657 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2658 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2659 // change default internal VM signals used - lower case for back compat
2660 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2661 // -Xoptimize
2662 } else if (match_option(option, "-Xoptimize", &tail)) {
2663 // EVM option, ignore silently for compatibility
2664 // -Xprof
2665 } else if (match_option(option, "-Xprof", &tail)) {
2666 #if INCLUDE_FPROF
2667 _has_profile = true;
2668 #else // INCLUDE_FPROF
2669 jio_fprintf(defaultStream::error_stream(),
2670 "Flat profiling is not supported in this VM.\n");
2671 return JNI_ERR;
2672 #endif // INCLUDE_FPROF
2673 // -Xaprof
2674 } else if (match_option(option, "-Xaprof", &tail)) {
2675 _has_alloc_profile = true;
2676 // -Xconcurrentio
2677 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2678 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2679 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2680 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2681 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2682 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2683
2684 // -Xinternalversion
2685 } else if (match_option(option, "-Xinternalversion", &tail)) {
2686 jio_fprintf(defaultStream::output_stream(), "%s\n",
2687 VM_Version::internal_vm_info_string());
2688 vm_exit(0);
2689 #ifndef PRODUCT
2690 // -Xprintflags
2691 } else if (match_option(option, "-Xprintflags", &tail)) {
2692 CommandLineFlags::printFlags(tty, false);
2693 vm_exit(0);
2694 #endif
2695 // -D
2696 } else if (match_option(option, "-D", &tail)) {
2697 if (!add_property(tail)) {
2698 return JNI_ENOMEM;
2699 }
2700 // Out of the box management support
2701 if (match_option(option, "-Dcom.sun.management", &tail)) {
2702 #if INCLUDE_MANAGEMENT
2703 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2704 #else
2705 jio_fprintf(defaultStream::output_stream(),
2706 "-Dcom.sun.management is not supported in this VM.\n");
2707 return JNI_ERR;
2708 #endif
2709 }
2710 // -Xint
2711 } else if (match_option(option, "-Xint", &tail)) {
2712 set_mode_flags(_int);
2713 // -Xmixed
2714 } else if (match_option(option, "-Xmixed", &tail)) {
2715 set_mode_flags(_mixed);
2716 // -Xcomp
2717 } else if (match_option(option, "-Xcomp", &tail)) {
2718 // for testing the compiler; turn off all flags that inhibit compilation
2719 set_mode_flags(_comp);
2720 // -Xshare:dump
2721 } else if (match_option(option, "-Xshare:dump", &tail)) {
2722 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2723 set_mode_flags(_int); // Prevent compilation, which creates objects
2724 // -Xshare:on
2725 } else if (match_option(option, "-Xshare:on", &tail)) {
2726 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2727 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2728 // -Xshare:auto
2729 } else if (match_option(option, "-Xshare:auto", &tail)) {
2730 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2731 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2732 // -Xshare:off
2733 } else if (match_option(option, "-Xshare:off", &tail)) {
2734 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2735 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2736 // -Xverify
2737 } else if (match_option(option, "-Xverify", &tail)) {
2738 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2739 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2740 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2741 } else if (strcmp(tail, ":remote") == 0) {
2742 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2743 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2744 } else if (strcmp(tail, ":none") == 0) {
2745 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2746 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2747 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2748 return JNI_EINVAL;
2749 }
2750 // -Xdebug
2751 } else if (match_option(option, "-Xdebug", &tail)) {
2752 // note this flag has been used, then ignore
2753 set_xdebug_mode(true);
2754 // -Xnoagent
2755 } else if (match_option(option, "-Xnoagent", &tail)) {
2756 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2757 } else if (match_option(option, "-Xboundthreads", &tail)) {
2758 // Bind user level threads to kernel threads (Solaris only)
2759 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2760 } else if (match_option(option, "-Xloggc:", &tail)) {
2761 // Redirect GC output to the file. -Xloggc:<filename>
2762 // ostream_init_log(), when called will use this filename
2763 // to initialize a fileStream.
2764 _gc_log_filename = strdup(tail);
2765 FLAG_SET_CMDLINE(bool, PrintGC, true);
2766 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2767
2768 // JNI hooks
2769 } else if (match_option(option, "-Xcheck", &tail)) {
2770 if (!strcmp(tail, ":jni")) {
2771 #if !INCLUDE_JNI_CHECK
2772 warning("JNI CHECKING is not supported in this VM");
2773 #else
2774 CheckJNICalls = true;
2775 #endif // INCLUDE_JNI_CHECK
2776 } else if (is_bad_option(option, args->ignoreUnrecognized,
2777 "check")) {
2778 return JNI_EINVAL;
2779 }
2780 } else if (match_option(option, "vfprintf", &tail)) {
2781 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2782 } else if (match_option(option, "exit", &tail)) {
2783 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2784 } else if (match_option(option, "abort", &tail)) {
2785 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2786 // -XX:+AggressiveHeap
2787 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2788
2789 // This option inspects the machine and attempts to set various
2790 // parameters to be optimal for long-running, memory allocation
2791 // intensive jobs. It is intended for machines with large
2792 // amounts of cpu and memory.
2793
2794 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2795 // VM, but we may not be able to represent the total physical memory
2796 // available (like having 8gb of memory on a box but using a 32bit VM).
2797 // Thus, we need to make sure we're using a julong for intermediate
2798 // calculations.
2799 julong initHeapSize;
2800 julong total_memory = os::physical_memory();
2801
2802 if (total_memory < (julong)256*M) {
2803 jio_fprintf(defaultStream::error_stream(),
2804 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2805 vm_exit(1);
2806 }
2807
2808 // The heap size is half of available memory, or (at most)
2809 // all of possible memory less 160mb (leaving room for the OS
2810 // when using ISM). This is the maximum; because adaptive sizing
2811 // is turned on below, the actual space used may be smaller.
2812
2813 initHeapSize = MIN2(total_memory / (julong)2,
2814 total_memory - (julong)160*M);
2815
2816 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2817
2818 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2819 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2820 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2821 // Currently the minimum size and the initial heap sizes are the same.
2822 set_min_heap_size(initHeapSize);
2823 }
2824 if (FLAG_IS_DEFAULT(NewSize)) {
2825 // Make the young generation 3/8ths of the total heap.
2826 FLAG_SET_CMDLINE(uintx, NewSize,
2827 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2828 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2829 }
2830
2831 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2832 FLAG_SET_DEFAULT(UseLargePages, true);
2833 #endif
2834
2835 // Increase some data structure sizes for efficiency
2836 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2837 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2838 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2839
2840 // See the OldPLABSize comment below, but replace 'after promotion'
2841 // with 'after copying'. YoungPLABSize is the size of the survivor
2842 // space per-gc-thread buffers. The default is 4kw.
2843 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2844
2845 // OldPLABSize is the size of the buffers in the old gen that
2846 // UseParallelGC uses to promote live data that doesn't fit in the
2847 // survivor spaces. At any given time, there's one for each gc thread.
2848 // The default size is 1kw. These buffers are rarely used, since the
2849 // survivor spaces are usually big enough. For specjbb, however, there
2850 // are occasions when there's lots of live data in the young gen
2851 // and we end up promoting some of it. We don't have a definite
2852 // explanation for why bumping OldPLABSize helps, but the theory
2853 // is that a bigger PLAB results in retaining something like the
2854 // original allocation order after promotion, which improves mutator
2855 // locality. A minor effect may be that larger PLABs reduce the
2856 // number of PLAB allocation events during gc. The value of 8kw
2857 // was arrived at by experimenting with specjbb.
2858 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2859
2860 // Enable parallel GC and adaptive generation sizing
2861 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2862 FLAG_SET_DEFAULT(ParallelGCThreads,
2863 Abstract_VM_Version::parallel_worker_threads());
2864
2865 // Encourage steady state memory management
2866 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2867
2868 // This appears to improve mutator locality
2869 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2870
2871 // Get around early Solaris scheduling bug
2872 // (affinity vs other jobs on system)
2873 // but disallow DR and offlining (5008695).
2874 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2875
2876 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2877 // the last option wins.
2878 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2879 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2880 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2881 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
2882 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2883 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2884 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2885 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
2886 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2887 uintx max_tenuring_thresh = 0;
2888 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2889 jio_fprintf(defaultStream::error_stream(),
2890 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
2891 }
2892 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
2893
2894 if (MaxTenuringThreshold == 0) {
2895 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2896 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2897 } else if (MaxTenuringThreshold == markOopDesc::max_age + 1) {
2898 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2899 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2900 } else {
2901 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2902 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2903 }
2904 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2905 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2906 jio_fprintf(defaultStream::error_stream(),
2907 "Please use CMSClassUnloadingEnabled in place of "
2908 "CMSPermGenSweepingEnabled in the future\n");
2909 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2910 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2911 jio_fprintf(defaultStream::error_stream(),
2912 "Please use -XX:+UseGCOverheadLimit in place of "
2913 "-XX:+UseGCTimeLimit in the future\n");
2914 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2915 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2916 jio_fprintf(defaultStream::error_stream(),
2917 "Please use -XX:-UseGCOverheadLimit in place of "
2918 "-XX:-UseGCTimeLimit in the future\n");
2919 // The TLE options are for compatibility with 1.3 and will be
2920 // removed without notice in a future release. These options
2921 // are not to be documented.
2922 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2923 // No longer used.
2924 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2925 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2926 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2927 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2928 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2929 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2930 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2931 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2932 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2933 // No longer used.
2934 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2935 julong long_tlab_size = 0;
2936 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2937 if (errcode != arg_in_range) {
2938 jio_fprintf(defaultStream::error_stream(),
2939 "Invalid TLAB size: %s\n", option->optionString);
2940 describe_range_error(errcode);
2941 return JNI_EINVAL;
2942 }
2943 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2944 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2945 // No longer used.
2946 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2947 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2948 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2949 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2950 SOLARIS_ONLY(
2951 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2952 warning("-XX:+UsePermISM is obsolete.");
2953 FLAG_SET_CMDLINE(bool, UseISM, true);
2954 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2955 FLAG_SET_CMDLINE(bool, UseISM, false);
2956 )
2957 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2958 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2959 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2960 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2961 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2962 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2963 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2964 #if defined(DTRACE_ENABLED)
2965 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2966 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2967 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2968 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2969 #else // defined(DTRACE_ENABLED)
2970 jio_fprintf(defaultStream::error_stream(),
2971 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2972 return JNI_EINVAL;
2973 #endif // defined(DTRACE_ENABLED)
2974 #ifdef ASSERT
2975 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2976 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2977 // disable scavenge before parallel mark-compact
2978 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2979 #endif
2980 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2981 julong cms_blocks_to_claim = (julong)atol(tail);
2982 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2983 jio_fprintf(defaultStream::error_stream(),
2984 "Please use -XX:OldPLABSize in place of "
2985 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2986 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2987 julong cms_blocks_to_claim = (julong)atol(tail);
2988 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2989 jio_fprintf(defaultStream::error_stream(),
2990 "Please use -XX:OldPLABSize in place of "
2991 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2992 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2993 julong old_plab_size = 0;
2994 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2995 if (errcode != arg_in_range) {
2996 jio_fprintf(defaultStream::error_stream(),
2997 "Invalid old PLAB size: %s\n", option->optionString);
2998 describe_range_error(errcode);
2999 return JNI_EINVAL;
3000 }
3001 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3002 jio_fprintf(defaultStream::error_stream(),
3003 "Please use -XX:OldPLABSize in place of "
3004 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3005 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3006 julong young_plab_size = 0;
3007 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3008 if (errcode != arg_in_range) {
3009 jio_fprintf(defaultStream::error_stream(),
3010 "Invalid young PLAB size: %s\n", option->optionString);
3011 describe_range_error(errcode);
3012 return JNI_EINVAL;
3013 }
3014 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3015 jio_fprintf(defaultStream::error_stream(),
3016 "Please use -XX:YoungPLABSize in place of "
3017 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3018 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3019 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3020 julong stack_size = 0;
3021 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3022 if (errcode != arg_in_range) {
3023 jio_fprintf(defaultStream::error_stream(),
3024 "Invalid mark stack size: %s\n", option->optionString);
3025 describe_range_error(errcode);
3026 return JNI_EINVAL;
3027 }
3028 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3029 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3030 julong max_stack_size = 0;
3031 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3032 if (errcode != arg_in_range) {
3033 jio_fprintf(defaultStream::error_stream(),
3034 "Invalid maximum mark stack size: %s\n",
3035 option->optionString);
3036 describe_range_error(errcode);
3037 return JNI_EINVAL;
3038 }
3039 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3040 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3041 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3042 uintx conc_threads = 0;
3043 if (!parse_uintx(tail, &conc_threads, 1)) {
3044 jio_fprintf(defaultStream::error_stream(),
3045 "Invalid concurrent threads: %s\n", option->optionString);
3046 return JNI_EINVAL;
3047 }
3048 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3049 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3050 julong max_direct_memory_size = 0;
3051 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3052 if (errcode != arg_in_range) {
3053 jio_fprintf(defaultStream::error_stream(),
3054 "Invalid maximum direct memory size: %s\n",
3055 option->optionString);
3056 describe_range_error(errcode);
3057 return JNI_EINVAL;
3058 }
3059 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3060 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3061 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3062 // away and will cause VM initialization failures!
3063 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3064 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3065 #if !INCLUDE_MANAGEMENT
3066 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3067 jio_fprintf(defaultStream::error_stream(),
3068 "ManagementServer is not supported in this VM.\n");
3069 return JNI_ERR;
3070 #endif // INCLUDE_MANAGEMENT
3071 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3072 // Skip -XX:Flags= since that case has already been handled
3073 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3074 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3075 return JNI_EINVAL;
3076 }
3077 }
3078 // Unknown option
3079 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3080 return JNI_ERR;
3081 }
3082 }
3083
3084 // Change the default value for flags which have different default values
3085 // when working with older JDKs.
3086 #ifdef LINUX
3087 if (JDK_Version::current().compare_major(6) <= 0 &&
3088 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3089 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3090 }
3091 #endif // LINUX
3092 return JNI_OK;
3093 }
3094
3095 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3096 // This must be done after all -D arguments have been processed.
3097 scp_p->expand_endorsed();
3098
3099 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3100 // Assemble the bootclasspath elements into the final path.
3101 Arguments::set_sysclasspath(scp_p->combined_path());
3102 }
3103
3104 // This must be done after all arguments have been processed.
3105 // java_compiler() true means set to "NONE" or empty.
3106 if (java_compiler() && !xdebug_mode()) {
3107 // For backwards compatibility, we switch to interpreted mode if
3108 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3109 // not specified.
3110 set_mode_flags(_int);
3111 }
3112 if (CompileThreshold == 0) {
3113 set_mode_flags(_int);
3114 }
3115
3116 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3117 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3118 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3119 }
3120
3121 #ifndef COMPILER2
3122 // Don't degrade server performance for footprint
3123 if (FLAG_IS_DEFAULT(UseLargePages) &&
3124 MaxHeapSize < LargePageHeapSizeThreshold) {
3125 // No need for large granularity pages w/small heaps.
3126 // Note that large pages are enabled/disabled for both the
3127 // Java heap and the code cache.
3128 FLAG_SET_DEFAULT(UseLargePages, false);
3129 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
3130 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
3131 }
3132
3133 // Tiered compilation is undefined with C1.
3134 TieredCompilation = false;
3135 #else
3136 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3137 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3138 }
3139 #endif
3140
3141 // If we are running in a headless jre, force java.awt.headless property
3142 // to be true unless the property has already been set.
3143 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3144 if (os::is_headless_jre()) {
3145 const char* headless = Arguments::get_property("java.awt.headless");
3146 if (headless == NULL) {
3147 char envbuffer[128];
3148 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3149 if (!add_property("java.awt.headless=true")) {
3150 return JNI_ENOMEM;
3151 }
3152 } else {
3153 char buffer[256];
3154 strcpy(buffer, "java.awt.headless=");
3155 strcat(buffer, envbuffer);
3156 if (!add_property(buffer)) {
3157 return JNI_ENOMEM;
3158 }
3159 }
3160 }
3161 }
3162
3163 if (!check_vm_args_consistency()) {
3164 return JNI_ERR;
3165 }
3166
3167 return JNI_OK;
3168 }
3169
3170 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3171 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3172 scp_assembly_required_p);
3173 }
3174
3175 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3176 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3177 scp_assembly_required_p);
3178 }
3179
3180 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3181 const int N_MAX_OPTIONS = 64;
3182 const int OPTION_BUFFER_SIZE = 1024;
3183 char buffer[OPTION_BUFFER_SIZE];
3184
3185 // The variable will be ignored if it exceeds the length of the buffer.
3186 // Don't check this variable if user has special privileges
3187 // (e.g. unix su command).
3188 if (os::getenv(name, buffer, sizeof(buffer)) &&
3189 !os::have_special_privileges()) {
3190 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3191 jio_fprintf(defaultStream::error_stream(),
3192 "Picked up %s: %s\n", name, buffer);
3193 char* rd = buffer; // pointer to the input string (rd)
3194 int i;
3195 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3196 while (isspace(*rd)) rd++; // skip whitespace
3197 if (*rd == 0) break; // we re done when the input string is read completely
3198
3199 // The output, option string, overwrites the input string.
3200 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3201 // input string (rd).
3202 char* wrt = rd;
3203
3204 options[i++].optionString = wrt; // Fill in option
3205 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3206 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3207 int quote = *rd; // matching quote to look for
3208 rd++; // don't copy open quote
3209 while (*rd != quote) { // include everything (even spaces) up until quote
3210 if (*rd == 0) { // string termination means unmatched string
3211 jio_fprintf(defaultStream::error_stream(),
3212 "Unmatched quote in %s\n", name);
3213 return JNI_ERR;
3214 }
3215 *wrt++ = *rd++; // copy to option string
3216 }
3217 rd++; // don't copy close quote
3218 } else {
3219 *wrt++ = *rd++; // copy to option string
3220 }
3221 }
3222 // Need to check if we're done before writing a NULL,
3223 // because the write could be to the byte that rd is pointing to.
3224 if (*rd++ == 0) {
3225 *wrt = 0;
3226 break;
3227 }
3228 *wrt = 0; // Zero terminate option
3229 }
3230 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3231 JavaVMInitArgs vm_args;
3232 vm_args.version = JNI_VERSION_1_2;
3233 vm_args.options = options;
3234 vm_args.nOptions = i;
3235 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3236
3237 if (PrintVMOptions) {
3238 const char* tail;
3239 for (int i = 0; i < vm_args.nOptions; i++) {
3240 const JavaVMOption *option = vm_args.options + i;
3241 if (match_option(option, "-XX:", &tail)) {
3242 logOption(tail);
3243 }
3244 }
3245 }
3246
3247 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
3248 }
3249 return JNI_OK;
3250 }
3251
3252 void Arguments::set_shared_spaces_flags() {
3253 #ifdef _LP64
3254 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
3255
3256 // CompressedOops cannot be used with CDS. The offsets of oopmaps and
3257 // static fields are incorrect in the archive. With some more clever
3258 // initialization, this restriction can probably be lifted.
3259 if (UseCompressedOops) {
3260 if (must_share) {
3261 warning("disabling compressed oops because of %s",
3262 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
3263 FLAG_SET_CMDLINE(bool, UseCompressedOops, false);
3264 FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false);
3265 } else {
3266 // Prefer compressed oops to class data sharing
3267 if (UseSharedSpaces && Verbose) {
3268 warning("turning off use of shared archive because of compressed oops");
3269 }
3270 no_shared_spaces();
3271 }
3272 }
3273 #endif
3274
3275 if (DumpSharedSpaces) {
3276 if (RequireSharedSpaces) {
3277 warning("cannot dump shared archive while using shared archive");
3278 }
3279 UseSharedSpaces = false;
3280 }
3281 }
3282
3283 // Disable options not supported in this release, with a warning if they
3284 // were explicitly requested on the command-line
3285 #define UNSUPPORTED_OPTION(opt, description) \
3286 do { \
3287 if (opt) { \
3288 if (FLAG_IS_CMDLINE(opt)) { \
3289 warning(description " is disabled in this release."); \
3290 } \
3291 FLAG_SET_DEFAULT(opt, false); \
3292 } \
3293 } while(0)
3294
3295
3296 #define UNSUPPORTED_GC_OPTION(gc) \
3297 do { \
3298 if (gc) { \
3299 if (FLAG_IS_CMDLINE(gc)) { \
3300 warning(#gc " is not supported in this VM. Using Serial GC."); \
3301 } \
3302 FLAG_SET_DEFAULT(gc, false); \
3303 } \
3304 } while(0)
3305
3306 #if !INCLUDE_ALL_GCS
3307 static void force_serial_gc() {
3308 FLAG_SET_DEFAULT(UseSerialGC, true);
3309 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3310 UNSUPPORTED_GC_OPTION(UseG1GC);
3311 UNSUPPORTED_GC_OPTION(UseParallelGC);
3312 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3313 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3314 UNSUPPORTED_GC_OPTION(UseParNewGC);
3315 }
3316 #endif // INCLUDE_ALL_GCS
3317
3318 // Sharing support
3319 // Construct the path to the archive
3320 static char* get_shared_archive_path() {
3321 char *shared_archive_path;
3322 if (SharedArchiveFile == NULL) {
3323 char jvm_path[JVM_MAXPATHLEN];
3324 os::jvm_path(jvm_path, sizeof(jvm_path));
3325 char *end = strrchr(jvm_path, *os::file_separator());
3326 if (end != NULL) *end = '\0';
3327 size_t jvm_path_len = strlen(jvm_path);
3328 size_t file_sep_len = strlen(os::file_separator());
3329 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3330 file_sep_len + 20, mtInternal);
3331 if (shared_archive_path != NULL) {
3332 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3333 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3334 strncat(shared_archive_path, "classes.jsa", 11);
3335 }
3336 } else {
3337 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3338 if (shared_archive_path != NULL) {
3339 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3340 }
3341 }
3342 return shared_archive_path;
3343 }
3344
3345 // Parse entry point called from JNI_CreateJavaVM
3346
3347 jint Arguments::parse(const JavaVMInitArgs* args) {
3348
3349 // Remaining part of option string
3350 const char* tail;
3351
3352 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3353 const char* hotspotrc = ".hotspotrc";
3354 bool settings_file_specified = false;
3355 bool needs_hotspotrc_warning = false;
3356
3357 const char* flags_file;
3358 int index;
3359 for (index = 0; index < args->nOptions; index++) {
3360 const JavaVMOption *option = args->options + index;
3361 if (match_option(option, "-XX:Flags=", &tail)) {
3362 flags_file = tail;
3363 settings_file_specified = true;
3364 }
3365 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3366 PrintVMOptions = true;
3367 }
3368 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3369 PrintVMOptions = false;
3370 }
3371 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3372 IgnoreUnrecognizedVMOptions = true;
3373 }
3374 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3375 IgnoreUnrecognizedVMOptions = false;
3376 }
3377 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3378 CommandLineFlags::printFlags(tty, false);
3379 vm_exit(0);
3380 }
3381 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3382 #if INCLUDE_NMT
3383 MemTracker::init_tracking_options(tail);
3384 #else
3385 jio_fprintf(defaultStream::error_stream(),
3386 "Native Memory Tracking is not supported in this VM\n");
3387 return JNI_ERR;
3388 #endif
3389 }
3390
3391
3392 #ifndef PRODUCT
3393 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3394 CommandLineFlags::printFlags(tty, true);
3395 vm_exit(0);
3396 }
3397 #endif
3398 }
3399
3400 if (IgnoreUnrecognizedVMOptions) {
3401 // uncast const to modify the flag args->ignoreUnrecognized
3402 *(jboolean*)(&args->ignoreUnrecognized) = true;
3403 }
3404
3405 // Parse specified settings file
3406 if (settings_file_specified) {
3407 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3408 return JNI_EINVAL;
3409 }
3410 } else {
3411 #ifdef ASSERT
3412 // Parse default .hotspotrc settings file
3413 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3414 return JNI_EINVAL;
3415 }
3416 #else
3417 struct stat buf;
3418 if (os::stat(hotspotrc, &buf) == 0) {
3419 needs_hotspotrc_warning = true;
3420 }
3421 #endif
3422 }
3423
3424 if (PrintVMOptions) {
3425 for (index = 0; index < args->nOptions; index++) {
3426 const JavaVMOption *option = args->options + index;
3427 if (match_option(option, "-XX:", &tail)) {
3428 logOption(tail);
3429 }
3430 }
3431 }
3432
3433 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3434 jint result = parse_vm_init_args(args);
3435 if (result != JNI_OK) {
3436 return result;
3437 }
3438
3439 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3440 SharedArchivePath = get_shared_archive_path();
3441 if (SharedArchivePath == NULL) {
3442 return JNI_ENOMEM;
3443 }
3444
3445 // Delay warning until here so that we've had a chance to process
3446 // the -XX:-PrintWarnings flag
3447 if (needs_hotspotrc_warning) {
3448 warning("%s file is present but has been ignored. "
3449 "Run with -XX:Flags=%s to load the file.",
3450 hotspotrc, hotspotrc);
3451 }
3452
3453 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3454 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3455 #endif
3456
3457 #if INCLUDE_ALL_GCS
3458 #if (defined JAVASE_EMBEDDED || defined ARM)
3459 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3460 #endif
3461 #endif
3462
3463 #ifndef PRODUCT
3464 if (TraceBytecodesAt != 0) {
3465 TraceBytecodes = true;
3466 }
3467 if (CountCompiledCalls) {
3468 if (UseCounterDecay) {
3469 warning("UseCounterDecay disabled because CountCalls is set");
3470 UseCounterDecay = false;
3471 }
3472 }
3473 #endif // PRODUCT
3474
3475 // JSR 292 is not supported before 1.7
3476 if (!JDK_Version::is_gte_jdk17x_version()) {
3477 if (EnableInvokeDynamic) {
3478 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3479 warning("JSR 292 is not supported before 1.7. Disabling support.");
3480 }
3481 EnableInvokeDynamic = false;
3482 }
3483 }
3484
3485 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3486 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3487 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3488 }
3489 ScavengeRootsInCode = 1;
3490 }
3491
3492 if (PrintGCDetails) {
3493 // Turn on -verbose:gc options as well
3494 PrintGC = true;
3495 }
3496
3497 if (!JDK_Version::is_gte_jdk18x_version()) {
3498 // To avoid changing the log format for 7 updates this flag is only
3499 // true by default in JDK8 and above.
3500 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3501 FLAG_SET_DEFAULT(PrintGCCause, false);
3502 }
3503 }
3504
3505 // Set object alignment values.
3506 set_object_alignment();
3507
3508 #if !INCLUDE_ALL_GCS
3509 force_serial_gc();
3510 #endif // INCLUDE_ALL_GCS
3511 #if !INCLUDE_CDS
3512 if (DumpSharedSpaces || RequireSharedSpaces) {
3513 jio_fprintf(defaultStream::error_stream(),
3514 "Shared spaces are not supported in this VM\n");
3515 return JNI_ERR;
3516 }
3517 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3518 warning("Shared spaces are not supported in this VM");
3519 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3520 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3521 }
3522 no_shared_spaces();
3523 #endif // INCLUDE_CDS
3524
3525 // Set flags based on ergonomics.
3526 set_ergonomics_flags();
3527
3528 set_shared_spaces_flags();
3529
3530 // Check the GC selections again.
3531 if (!check_gc_consistency()) {
3532 return JNI_EINVAL;
3533 }
3534
3535 if (TieredCompilation) {
3536 set_tiered_flags();
3537 } else {
3538 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3539 if (CompilationPolicyChoice >= 2) {
3540 vm_exit_during_initialization(
3541 "Incompatible compilation policy selected", NULL);
3542 }
3543 }
3544
3545 set_heap_base_min_address();
3546
3547 // Set heap size based on available physical memory
3548 set_heap_size();
3549
3550 #if INCLUDE_ALL_GCS
3551 // Set per-collector flags
3552 if (UseParallelGC || UseParallelOldGC) {
3553 set_parallel_gc_flags();
3554 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3555 set_cms_and_parnew_gc_flags();
3556 } else if (UseParNewGC) { // skipped if CMS is set above
3557 set_parnew_gc_flags();
3558 } else if (UseG1GC) {
3559 set_g1_gc_flags();
3560 }
3561 check_deprecated_gcs();
3562 check_deprecated_gc_flags();
3563 if (AssumeMP && !UseSerialGC) {
3564 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3565 warning("If the number of processors is expected to increase from one, then"
3566 " you should configure the number of parallel GC threads appropriately"
3567 " using -XX:ParallelGCThreads=N");
3568 }
3569 }
3570 #else // INCLUDE_ALL_GCS
3571 assert(verify_serial_gc_flags(), "SerialGC unset");
3572 #endif // INCLUDE_ALL_GCS
3573
3574 // Set bytecode rewriting flags
3575 set_bytecode_flags();
3576
3577 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3578 set_aggressive_opts_flags();
3579
3580 // Turn off biased locking for locking debug mode flags,
3581 // which are subtlely different from each other but neither works with
3582 // biased locking.
3583 if (UseHeavyMonitors
3584 #ifdef COMPILER1
3585 || !UseFastLocking
3586 #endif // COMPILER1
3587 ) {
3588 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3589 // flag set to true on command line; warn the user that they
3590 // can't enable biased locking here
3591 warning("Biased Locking is not supported with locking debug flags"
3592 "; ignoring UseBiasedLocking flag." );
3593 }
3594 UseBiasedLocking = false;
3595 }
3596
3597 #ifdef CC_INTERP
3598 // Clear flags not supported by the C++ interpreter
3599 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3600 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3601 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3602 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
3603 #endif // CC_INTERP
3604
3605 #ifdef COMPILER2
3606 if (!UseBiasedLocking || EmitSync != 0) {
3607 UseOptoBiasInlining = false;
3608 }
3609 if (!EliminateLocks) {
3610 EliminateNestedLocks = false;
3611 }
3612 if (!Inline) {
3613 IncrementalInline = false;
3614 }
3615 #ifndef PRODUCT
3616 if (!IncrementalInline) {
3617 AlwaysIncrementalInline = false;
3618 }
3619 #endif
3620 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3621 // incremental inlining: bump MaxNodeLimit
3622 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3623 }
3624 #endif
3625
3626 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3627 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3628 DebugNonSafepoints = true;
3629 }
3630
3631 #ifndef PRODUCT
3632 if (CompileTheWorld) {
3633 // Force NmethodSweeper to sweep whole CodeCache each time.
3634 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3635 NmethodSweepFraction = 1;
3636 }
3637 }
3638 #endif
3639
3640 if (PrintCommandLineFlags) {
3641 CommandLineFlags::printSetFlags(tty);
3642 }
3643
3644 // Apply CPU specific policy for the BiasedLocking
3645 if (UseBiasedLocking) {
3646 if (!VM_Version::use_biased_locking() &&
3647 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3648 UseBiasedLocking = false;
3649 }
3650 }
3651
3652 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3653 // but only if not already set on the commandline
3654 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3655 bool set = false;
3656 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3657 if (!set) {
3658 FLAG_SET_DEFAULT(PauseAtExit, true);
3659 }
3660 }
3661
3662 return JNI_OK;
3663 }
3664
3665 jint Arguments::adjust_after_os() {
3666 #if INCLUDE_ALL_GCS
3667 if (UseParallelGC || UseParallelOldGC) {
3668 if (UseNUMA) {
3669 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3670 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3671 }
3672 // For those collectors or operating systems (eg, Windows) that do
3673 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3674 UseNUMAInterleaving = true;
3675 }
3676 }
3677 #endif // INCLUDE_ALL_GCS
3678 return JNI_OK;
3679 }
3680
3681 int Arguments::PropertyList_count(SystemProperty* pl) {
3682 int count = 0;
3683 while(pl != NULL) {
3684 count++;
3685 pl = pl->next();
3686 }
3687 return count;
3688 }
3689
3690 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3691 assert(key != NULL, "just checking");
3692 SystemProperty* prop;
3693 for (prop = pl; prop != NULL; prop = prop->next()) {
3694 if (strcmp(key, prop->key()) == 0) return prop->value();
3695 }
3696 return NULL;
3697 }
3698
3699 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3700 int count = 0;
3701 const char* ret_val = NULL;
3702
3703 while(pl != NULL) {
3704 if(count >= index) {
3705 ret_val = pl->key();
3706 break;
3707 }
3708 count++;
3709 pl = pl->next();
3710 }
3711
3712 return ret_val;
3713 }
3714
3715 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3716 int count = 0;
3717 char* ret_val = NULL;
3718
3719 while(pl != NULL) {
3720 if(count >= index) {
3721 ret_val = pl->value();
3722 break;
3723 }
3724 count++;
3725 pl = pl->next();
3726 }
3727
3728 return ret_val;
3729 }
3730
3731 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3732 SystemProperty* p = *plist;
3733 if (p == NULL) {
3734 *plist = new_p;
3735 } else {
3736 while (p->next() != NULL) {
3737 p = p->next();
3738 }
3739 p->set_next(new_p);
3740 }
3741 }
3742
3743 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3744 if (plist == NULL)
3745 return;
3746
3747 SystemProperty* new_p = new SystemProperty(k, v, true);
3748 PropertyList_add(plist, new_p);
3749 }
3750
3751 // This add maintains unique property key in the list.
3752 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3753 if (plist == NULL)
3754 return;
3755
3756 // If property key exist then update with new value.
3757 SystemProperty* prop;
3758 for (prop = *plist; prop != NULL; prop = prop->next()) {
3759 if (strcmp(k, prop->key()) == 0) {
3760 if (append) {
3761 prop->append_value(v);
3762 } else {
3763 prop->set_value(v);
3764 }
3765 return;
3766 }
3767 }
3768
3769 PropertyList_add(plist, k, v);
3770 }
3771
3772 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3773 // Returns true if all of the source pointed by src has been copied over to
3774 // the destination buffer pointed by buf. Otherwise, returns false.
3775 // Notes:
3776 // 1. If the length (buflen) of the destination buffer excluding the
3777 // NULL terminator character is not long enough for holding the expanded
3778 // pid characters, it also returns false instead of returning the partially
3779 // expanded one.
3780 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3781 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3782 char* buf, size_t buflen) {
3783 const char* p = src;
3784 char* b = buf;
3785 const char* src_end = &src[srclen];
3786 char* buf_end = &buf[buflen - 1];
3787
3788 while (p < src_end && b < buf_end) {
3789 if (*p == '%') {
3790 switch (*(++p)) {
3791 case '%': // "%%" ==> "%"
3792 *b++ = *p++;
3793 break;
3794 case 'p': { // "%p" ==> current process id
3795 // buf_end points to the character before the last character so
3796 // that we could write '\0' to the end of the buffer.
3797 size_t buf_sz = buf_end - b + 1;
3798 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3799
3800 // if jio_snprintf fails or the buffer is not long enough to hold
3801 // the expanded pid, returns false.
3802 if (ret < 0 || ret >= (int)buf_sz) {
3803 return false;
3804 } else {
3805 b += ret;
3806 assert(*b == '\0', "fail in copy_expand_pid");
3807 if (p == src_end && b == buf_end + 1) {
3808 // reach the end of the buffer.
3809 return true;
3810 }
3811 }
3812 p++;
3813 break;
3814 }
3815 default :
3816 *b++ = '%';
3817 }
3818 } else {
3819 *b++ = *p++;
3820 }
3821 }
3822 *b = '\0';
3823 return (p == src_end); // return false if not all of the source was copied
3824 }