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 // Disable options not supported in this release, with a warning if they
64 // were explicitly requested on the command-line
65 #define UNSUPPORTED_OPTION(opt, description) \
66 do { \
67 if (opt) { \
68 if (FLAG_IS_CMDLINE(opt)) { \
69 warning(description " is disabled in this release."); \
70 } \
71 FLAG_SET_DEFAULT(opt, false); \
72 } \
73 } while(0)
74
75 #define UNSUPPORTED_GC_OPTION(gc) \
76 do { \
77 if (gc) { \
78 if (FLAG_IS_CMDLINE(gc)) { \
79 warning(#gc " is not supported in this VM. Using Serial GC."); \
80 } \
81 FLAG_SET_DEFAULT(gc, false); \
82 } \
83 } while(0)
84
85 char** Arguments::_jvm_flags_array = NULL;
86 int Arguments::_num_jvm_flags = 0;
87 char** Arguments::_jvm_args_array = NULL;
88 int Arguments::_num_jvm_args = 0;
89 char* Arguments::_java_command = NULL;
90 SystemProperty* Arguments::_system_properties = NULL;
91 const char* Arguments::_gc_log_filename = NULL;
92 bool Arguments::_has_profile = false;
93 uintx Arguments::_min_heap_size = 0;
94 Arguments::Mode Arguments::_mode = _mixed;
95 bool Arguments::_java_compiler = false;
96 bool Arguments::_xdebug_mode = false;
97 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
98 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
99 int Arguments::_sun_java_launcher_pid = -1;
100 bool Arguments::_created_by_gamma_launcher = false;
101
102 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
103 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
104 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
105 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
106 bool Arguments::_ClipInlining = ClipInlining;
107
108 char* Arguments::SharedArchivePath = NULL;
109
110 AgentLibraryList Arguments::_libraryList;
111 AgentLibraryList Arguments::_agentList;
112
113 abort_hook_t Arguments::_abort_hook = NULL;
114 exit_hook_t Arguments::_exit_hook = NULL;
115 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
116
117
118 SystemProperty *Arguments::_java_ext_dirs = NULL;
119 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
120 SystemProperty *Arguments::_sun_boot_library_path = NULL;
121 SystemProperty *Arguments::_java_library_path = NULL;
122 SystemProperty *Arguments::_java_home = NULL;
123 SystemProperty *Arguments::_java_class_path = NULL;
124 SystemProperty *Arguments::_sun_boot_class_path = NULL;
125
126 char* Arguments::_meta_index_path = NULL;
127 char* Arguments::_meta_index_dir = NULL;
128
129 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
130
131 static bool match_option(const JavaVMOption *option, const char* name,
132 const char** tail) {
133 int len = (int)strlen(name);
134 if (strncmp(option->optionString, name, len) == 0) {
135 *tail = option->optionString + len;
136 return true;
137 } else {
138 return false;
139 }
140 }
141
142 static void logOption(const char* opt) {
143 if (PrintVMOptions) {
144 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
145 }
146 }
147
148 // Process java launcher properties.
149 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
150 // See if sun.java.launcher or sun.java.launcher.pid is defined.
151 // Must do this before setting up other system properties,
152 // as some of them may depend on launcher type.
153 for (int index = 0; index < args->nOptions; index++) {
154 const JavaVMOption* option = args->options + index;
155 const char* tail;
156
157 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
158 process_java_launcher_argument(tail, option->extraInfo);
159 continue;
160 }
161 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
162 _sun_java_launcher_pid = atoi(tail);
163 continue;
164 }
165 }
166 }
167
168 // Initialize system properties key and value.
169 void Arguments::init_system_properties() {
170
171 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
172 "Java Virtual Machine Specification", false));
173 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
174 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
175 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
176
177 // following are JVMTI agent writeable properties.
178 // Properties values are set to NULL and they are
179 // os specific they are initialized in os::init_system_properties_values().
180 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
181 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
182 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
183 _java_library_path = new SystemProperty("java.library.path", NULL, true);
184 _java_home = new SystemProperty("java.home", NULL, true);
185 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
186
187 _java_class_path = new SystemProperty("java.class.path", "", true);
188
189 // Add to System Property list.
190 PropertyList_add(&_system_properties, _java_ext_dirs);
191 PropertyList_add(&_system_properties, _java_endorsed_dirs);
192 PropertyList_add(&_system_properties, _sun_boot_library_path);
193 PropertyList_add(&_system_properties, _java_library_path);
194 PropertyList_add(&_system_properties, _java_home);
195 PropertyList_add(&_system_properties, _java_class_path);
196 PropertyList_add(&_system_properties, _sun_boot_class_path);
197
198 // Set OS specific system properties values
199 os::init_system_properties_values();
200 }
201
202
203 // Update/Initialize System properties after JDK version number is known
204 void Arguments::init_version_specific_system_properties() {
205 enum { bufsz = 16 };
206 char buffer[bufsz];
207 const char* spec_vendor = "Sun Microsystems Inc.";
208 uint32_t spec_version = 0;
209
210 if (JDK_Version::is_gte_jdk17x_version()) {
211 spec_vendor = "Oracle Corporation";
212 spec_version = JDK_Version::current().major_version();
213 }
214 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
215
216 PropertyList_add(&_system_properties,
217 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
218 PropertyList_add(&_system_properties,
219 new SystemProperty("java.vm.specification.version", buffer, false));
220 PropertyList_add(&_system_properties,
221 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
222 }
223
224 /**
225 * Provide a slightly more user-friendly way of eliminating -XX flags.
226 * When a flag is eliminated, it can be added to this list in order to
227 * continue accepting this flag on the command-line, while issuing a warning
228 * and ignoring the value. Once the JDK version reaches the 'accept_until'
229 * limit, we flatly refuse to admit the existence of the flag. This allows
230 * a flag to die correctly over JDK releases using HSX.
231 */
232 typedef struct {
233 const char* name;
234 JDK_Version obsoleted_in; // when the flag went away
235 JDK_Version accept_until; // which version to start denying the existence
236 } ObsoleteFlag;
237
238 static ObsoleteFlag obsolete_jvm_flags[] = {
239 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
240 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
241 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
242 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
243 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
244 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
245 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
246 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
247 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
248 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
249 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
250 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
251 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
252 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
253 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
254 { "DefaultInitialRAMFraction",
255 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
256 { "UseDepthFirstScavengeOrder",
257 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
258 { "HandlePromotionFailure",
259 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
260 { "MaxLiveObjectEvacuationRatio",
261 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
262 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
263 { "UseParallelOldGCCompacting",
264 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
265 { "UseParallelDensePrefixUpdate",
266 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
267 { "UseParallelOldGCDensePrefix",
268 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
269 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
270 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
271 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
272 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
273 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
274 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
275 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
276 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
277 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
278 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
279 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
280 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
281 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
282 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
283 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
284 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
285 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 #ifdef PRODUCT
290 { "DesiredMethodLimit",
291 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
292 #endif // PRODUCT
293 { NULL, JDK_Version(0), JDK_Version(0) }
294 };
295
296 // Returns true if the flag is obsolete and fits into the range specified
297 // for being ignored. In the case that the flag is ignored, the 'version'
298 // value is filled in with the version number when the flag became
299 // obsolete so that that value can be displayed to the user.
300 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
301 int i = 0;
302 assert(version != NULL, "Must provide a version buffer");
303 while (obsolete_jvm_flags[i].name != NULL) {
304 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
305 // <flag>=xxx form
306 // [-|+]<flag> form
307 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
308 ((s[0] == '+' || s[0] == '-') &&
309 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
310 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
311 *version = flag_status.obsoleted_in;
312 return true;
313 }
314 }
315 i++;
316 }
317 return false;
318 }
319
320 // Constructs the system class path (aka boot class path) from the following
321 // components, in order:
322 //
323 // prefix // from -Xbootclasspath/p:...
324 // endorsed // the expansion of -Djava.endorsed.dirs=...
325 // base // from os::get_system_properties() or -Xbootclasspath=
326 // suffix // from -Xbootclasspath/a:...
327 //
328 // java.endorsed.dirs is a list of directories; any jar or zip files in the
329 // directories are added to the sysclasspath just before the base.
330 //
331 // This could be AllStatic, but it isn't needed after argument processing is
332 // complete.
333 class SysClassPath: public StackObj {
334 public:
335 SysClassPath(const char* base);
336 ~SysClassPath();
337
338 inline void set_base(const char* base);
339 inline void add_prefix(const char* prefix);
340 inline void add_suffix_to_prefix(const char* suffix);
341 inline void add_suffix(const char* suffix);
342 inline void reset_path(const char* base);
343
344 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
345 // property. Must be called after all command-line arguments have been
346 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
347 // combined_path().
348 void expand_endorsed();
349
350 inline const char* get_base() const { return _items[_scp_base]; }
351 inline const char* get_prefix() const { return _items[_scp_prefix]; }
352 inline const char* get_suffix() const { return _items[_scp_suffix]; }
353 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
354
355 // Combine all the components into a single c-heap-allocated string; caller
356 // must free the string if/when no longer needed.
357 char* combined_path();
358
359 private:
360 // Utility routines.
361 static char* add_to_path(const char* path, const char* str, bool prepend);
362 static char* add_jars_to_path(char* path, const char* directory);
363
364 inline void reset_item_at(int index);
365
366 // Array indices for the items that make up the sysclasspath. All except the
367 // base are allocated in the C heap and freed by this class.
368 enum {
369 _scp_prefix, // from -Xbootclasspath/p:...
370 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
371 _scp_base, // the default sysclasspath
372 _scp_suffix, // from -Xbootclasspath/a:...
373 _scp_nitems // the number of items, must be last.
374 };
375
376 const char* _items[_scp_nitems];
377 DEBUG_ONLY(bool _expansion_done;)
378 };
379
380 SysClassPath::SysClassPath(const char* base) {
381 memset(_items, 0, sizeof(_items));
382 _items[_scp_base] = base;
383 DEBUG_ONLY(_expansion_done = false;)
384 }
385
386 SysClassPath::~SysClassPath() {
387 // Free everything except the base.
388 for (int i = 0; i < _scp_nitems; ++i) {
389 if (i != _scp_base) reset_item_at(i);
390 }
391 DEBUG_ONLY(_expansion_done = false;)
392 }
393
394 inline void SysClassPath::set_base(const char* base) {
395 _items[_scp_base] = base;
396 }
397
398 inline void SysClassPath::add_prefix(const char* prefix) {
399 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
400 }
401
402 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
403 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
404 }
405
406 inline void SysClassPath::add_suffix(const char* suffix) {
407 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
408 }
409
410 inline void SysClassPath::reset_item_at(int index) {
411 assert(index < _scp_nitems && index != _scp_base, "just checking");
412 if (_items[index] != NULL) {
413 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
414 _items[index] = NULL;
415 }
416 }
417
418 inline void SysClassPath::reset_path(const char* base) {
419 // Clear the prefix and suffix.
420 reset_item_at(_scp_prefix);
421 reset_item_at(_scp_suffix);
422 set_base(base);
423 }
424
425 //------------------------------------------------------------------------------
426
427 void SysClassPath::expand_endorsed() {
428 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
429
430 const char* path = Arguments::get_property("java.endorsed.dirs");
431 if (path == NULL) {
432 path = Arguments::get_endorsed_dir();
433 assert(path != NULL, "no default for java.endorsed.dirs");
434 }
435
436 char* expanded_path = NULL;
437 const char separator = *os::path_separator();
438 const char* const end = path + strlen(path);
439 while (path < end) {
440 const char* tmp_end = strchr(path, separator);
441 if (tmp_end == NULL) {
442 expanded_path = add_jars_to_path(expanded_path, path);
443 path = end;
444 } else {
445 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
446 memcpy(dirpath, path, tmp_end - path);
447 dirpath[tmp_end - path] = '\0';
448 expanded_path = add_jars_to_path(expanded_path, dirpath);
449 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
450 path = tmp_end + 1;
451 }
452 }
453 _items[_scp_endorsed] = expanded_path;
454 DEBUG_ONLY(_expansion_done = true;)
455 }
456
457 // Combine the bootclasspath elements, some of which may be null, into a single
458 // c-heap-allocated string.
459 char* SysClassPath::combined_path() {
460 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
461 assert(_expansion_done, "must call expand_endorsed() first.");
462
463 size_t lengths[_scp_nitems];
464 size_t total_len = 0;
465
466 const char separator = *os::path_separator();
467
468 // Get the lengths.
469 int i;
470 for (i = 0; i < _scp_nitems; ++i) {
471 if (_items[i] != NULL) {
472 lengths[i] = strlen(_items[i]);
473 // Include space for the separator char (or a NULL for the last item).
474 total_len += lengths[i] + 1;
475 }
476 }
477 assert(total_len > 0, "empty sysclasspath not allowed");
478
479 // Copy the _items to a single string.
480 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
481 char* cp_tmp = cp;
482 for (i = 0; i < _scp_nitems; ++i) {
483 if (_items[i] != NULL) {
484 memcpy(cp_tmp, _items[i], lengths[i]);
485 cp_tmp += lengths[i];
486 *cp_tmp++ = separator;
487 }
488 }
489 *--cp_tmp = '\0'; // Replace the extra separator.
490 return cp;
491 }
492
493 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
494 char*
495 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
496 char *cp;
497
498 assert(str != NULL, "just checking");
499 if (path == NULL) {
500 size_t len = strlen(str) + 1;
501 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
502 memcpy(cp, str, len); // copy the trailing null
503 } else {
504 const char separator = *os::path_separator();
505 size_t old_len = strlen(path);
506 size_t str_len = strlen(str);
507 size_t len = old_len + str_len + 2;
508
509 if (prepend) {
510 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
511 char* cp_tmp = cp;
512 memcpy(cp_tmp, str, str_len);
513 cp_tmp += str_len;
514 *cp_tmp = separator;
515 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
516 FREE_C_HEAP_ARRAY(char, path, mtInternal);
517 } else {
518 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
519 char* cp_tmp = cp + old_len;
520 *cp_tmp = separator;
521 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
522 }
523 }
524 return cp;
525 }
526
527 // Scan the directory and append any jar or zip files found to path.
528 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
529 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
530 DIR* dir = os::opendir(directory);
531 if (dir == NULL) return path;
532
533 char dir_sep[2] = { '\0', '\0' };
534 size_t directory_len = strlen(directory);
535 const char fileSep = *os::file_separator();
536 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
537
538 /* Scan the directory for jars/zips, appending them to path. */
539 struct dirent *entry;
540 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
541 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
542 const char* name = entry->d_name;
543 const char* ext = name + strlen(name) - 4;
544 bool isJarOrZip = ext > name &&
545 (os::file_name_strcmp(ext, ".jar") == 0 ||
546 os::file_name_strcmp(ext, ".zip") == 0);
547 if (isJarOrZip) {
548 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
549 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
550 path = add_to_path(path, jarpath, false);
551 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
552 }
553 }
554 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
555 os::closedir(dir);
556 return path;
557 }
558
559 // Parses a memory size specification string.
560 static bool atomull(const char *s, julong* result) {
561 julong n = 0;
562 int args_read = sscanf(s, JULONG_FORMAT, &n);
563 if (args_read != 1) {
564 return false;
565 }
566 while (*s != '\0' && isdigit(*s)) {
567 s++;
568 }
569 // 4705540: illegal if more characters are found after the first non-digit
570 if (strlen(s) > 1) {
571 return false;
572 }
573 switch (*s) {
574 case 'T': case 't':
575 *result = n * G * K;
576 // Check for overflow.
577 if (*result/((julong)G * K) != n) return false;
578 return true;
579 case 'G': case 'g':
580 *result = n * G;
581 if (*result/G != n) return false;
582 return true;
583 case 'M': case 'm':
584 *result = n * M;
585 if (*result/M != n) return false;
586 return true;
587 case 'K': case 'k':
588 *result = n * K;
589 if (*result/K != n) return false;
590 return true;
591 case '\0':
592 *result = n;
593 return true;
594 default:
595 return false;
596 }
597 }
598
599 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
600 if (size < min_size) return arg_too_small;
601 // Check that size will fit in a size_t (only relevant on 32-bit)
602 if (size > max_uintx) return arg_too_big;
603 return arg_in_range;
604 }
605
606 // Describe an argument out of range error
607 void Arguments::describe_range_error(ArgsRange errcode) {
608 switch(errcode) {
609 case arg_too_big:
610 jio_fprintf(defaultStream::error_stream(),
611 "The specified size exceeds the maximum "
612 "representable size.\n");
613 break;
614 case arg_too_small:
615 case arg_unreadable:
616 case arg_in_range:
617 // do nothing for now
618 break;
619 default:
620 ShouldNotReachHere();
621 }
622 }
623
624 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
625 return CommandLineFlags::boolAtPut(name, &value, origin);
626 }
627
628 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
629 double v;
630 if (sscanf(value, "%lf", &v) != 1) {
631 return false;
632 }
633
634 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
635 return true;
636 }
637 return false;
638 }
639
640 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
641 julong v;
642 intx intx_v;
643 bool is_neg = false;
644 // Check the sign first since atomull() parses only unsigned values.
645 if (*value == '-') {
646 if (!CommandLineFlags::intxAt(name, &intx_v)) {
647 return false;
648 }
649 value++;
650 is_neg = true;
651 }
652 if (!atomull(value, &v)) {
653 return false;
654 }
655 intx_v = (intx) v;
656 if (is_neg) {
657 intx_v = -intx_v;
658 }
659 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
660 return true;
661 }
662 uintx uintx_v = (uintx) v;
663 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
664 return true;
665 }
666 uint64_t uint64_t_v = (uint64_t) v;
667 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
668 return true;
669 }
670 return false;
671 }
672
673 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
674 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
675 // Contract: CommandLineFlags always returns a pointer that needs freeing.
676 FREE_C_HEAP_ARRAY(char, value, mtInternal);
677 return true;
678 }
679
680 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
681 const char* old_value = "";
682 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
683 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
684 size_t new_len = strlen(new_value);
685 const char* value;
686 char* free_this_too = NULL;
687 if (old_len == 0) {
688 value = new_value;
689 } else if (new_len == 0) {
690 value = old_value;
691 } else {
692 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
693 // each new setting adds another LINE to the switch:
694 sprintf(buf, "%s\n%s", old_value, new_value);
695 value = buf;
696 free_this_too = buf;
697 }
698 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
699 // CommandLineFlags always returns a pointer that needs freeing.
700 FREE_C_HEAP_ARRAY(char, value, mtInternal);
701 if (free_this_too != NULL) {
702 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
703 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
704 }
705 return true;
706 }
707
708 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
709
710 // range of acceptable characters spelled out for portability reasons
711 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
712 #define BUFLEN 255
713 char name[BUFLEN+1];
714 char dummy;
715
716 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
717 return set_bool_flag(name, false, origin);
718 }
719 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
720 return set_bool_flag(name, true, origin);
721 }
722
723 char punct;
724 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
725 const char* value = strchr(arg, '=') + 1;
726 Flag* flag = Flag::find_flag(name, strlen(name));
727 if (flag != NULL && flag->is_ccstr()) {
728 if (flag->ccstr_accumulates()) {
729 return append_to_string_flag(name, value, origin);
730 } else {
731 if (value[0] == '\0') {
732 value = NULL;
733 }
734 return set_string_flag(name, value, origin);
735 }
736 }
737 }
738
739 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
740 const char* value = strchr(arg, '=') + 1;
741 // -XX:Foo:=xxx will reset the string flag to the given value.
742 if (value[0] == '\0') {
743 value = NULL;
744 }
745 return set_string_flag(name, value, origin);
746 }
747
748 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
749 #define SIGNED_NUMBER_RANGE "[-0123456789]"
750 #define NUMBER_RANGE "[0123456789]"
751 char value[BUFLEN + 1];
752 char value2[BUFLEN + 1];
753 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
754 // Looks like a floating-point number -- try again with more lenient format string
755 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
756 return set_fp_numeric_flag(name, value, origin);
757 }
758 }
759
760 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
761 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
762 return set_numeric_flag(name, value, origin);
763 }
764
765 return false;
766 }
767
768 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
769 assert(bldarray != NULL, "illegal argument");
770
771 if (arg == NULL) {
772 return;
773 }
774
775 int new_count = *count + 1;
776
777 // expand the array and add arg to the last element
778 if (*bldarray == NULL) {
779 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
780 } else {
781 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
782 }
783 (*bldarray)[*count] = strdup(arg);
784 *count = new_count;
785 }
786
787 void Arguments::build_jvm_args(const char* arg) {
788 add_string(&_jvm_args_array, &_num_jvm_args, arg);
789 }
790
791 void Arguments::build_jvm_flags(const char* arg) {
792 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
793 }
794
795 // utility function to return a string that concatenates all
796 // strings in a given char** array
797 const char* Arguments::build_resource_string(char** args, int count) {
798 if (args == NULL || count == 0) {
799 return NULL;
800 }
801 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
802 for (int i = 1; i < count; i++) {
803 length += strlen(args[i]) + 1; // add 1 for a space
804 }
805 char* s = NEW_RESOURCE_ARRAY(char, length);
806 strcpy(s, args[0]);
807 for (int j = 1; j < count; j++) {
808 strcat(s, " ");
809 strcat(s, args[j]);
810 }
811 return (const char*) s;
812 }
813
814 void Arguments::print_on(outputStream* st) {
815 st->print_cr("VM Arguments:");
816 if (num_jvm_flags() > 0) {
817 st->print("jvm_flags: "); print_jvm_flags_on(st);
818 }
819 if (num_jvm_args() > 0) {
820 st->print("jvm_args: "); print_jvm_args_on(st);
821 }
822 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
823 if (_java_class_path != NULL) {
824 char* path = _java_class_path->value();
825 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
826 }
827 st->print_cr("Launcher Type: %s", _sun_java_launcher);
828 }
829
830 void Arguments::print_jvm_flags_on(outputStream* st) {
831 if (_num_jvm_flags > 0) {
832 for (int i=0; i < _num_jvm_flags; i++) {
833 st->print("%s ", _jvm_flags_array[i]);
834 }
835 st->print_cr("");
836 }
837 }
838
839 void Arguments::print_jvm_args_on(outputStream* st) {
840 if (_num_jvm_args > 0) {
841 for (int i=0; i < _num_jvm_args; i++) {
842 st->print("%s ", _jvm_args_array[i]);
843 }
844 st->print_cr("");
845 }
846 }
847
848 bool Arguments::process_argument(const char* arg,
849 jboolean ignore_unrecognized, FlagValueOrigin origin) {
850
851 JDK_Version since = JDK_Version();
852
853 if (parse_argument(arg, origin) || ignore_unrecognized) {
854 return true;
855 }
856
857 bool has_plus_minus = (*arg == '+' || *arg == '-');
858 const char* const argname = has_plus_minus ? arg + 1 : arg;
859 if (is_newly_obsolete(arg, &since)) {
860 char version[256];
861 since.to_string(version, sizeof(version));
862 warning("ignoring option %s; support was removed in %s", argname, version);
863 return true;
864 }
865
866 // For locked flags, report a custom error message if available.
867 // Otherwise, report the standard unrecognized VM option.
868
869 size_t arg_len;
870 const char* equal_sign = strchr(argname, '=');
871 if (equal_sign == NULL) {
872 arg_len = strlen(argname);
873 } else {
874 arg_len = equal_sign - argname;
875 }
876
877 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true);
878 if (found_flag != NULL) {
879 char locked_message_buf[BUFLEN];
880 found_flag->get_locked_message(locked_message_buf, BUFLEN);
881 if (strlen(locked_message_buf) == 0) {
882 if (found_flag->is_bool() && !has_plus_minus) {
883 jio_fprintf(defaultStream::error_stream(),
884 "Missing +/- setting for VM option '%s'\n", argname);
885 } else if (!found_flag->is_bool() && has_plus_minus) {
886 jio_fprintf(defaultStream::error_stream(),
887 "Unexpected +/- setting in VM option '%s'\n", argname);
888 } else {
889 jio_fprintf(defaultStream::error_stream(),
890 "Improperly specified VM option '%s'\n", argname);
891 }
892 } else {
893 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
894 }
895 } else {
896 jio_fprintf(defaultStream::error_stream(),
897 "Unrecognized VM option '%s'\n", argname);
898 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
899 if (fuzzy_matched != NULL) {
900 jio_fprintf(defaultStream::error_stream(),
901 "Did you mean '%s%s%s'?\n",
902 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
903 fuzzy_matched->name,
904 (fuzzy_matched->is_bool()) ? "" : "=<value>");
905 }
906 }
907
908 // allow for commandline "commenting out" options like -XX:#+Verbose
909 return arg[0] == '#';
910 }
911
912 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
913 FILE* stream = fopen(file_name, "rb");
914 if (stream == NULL) {
915 if (should_exist) {
916 jio_fprintf(defaultStream::error_stream(),
917 "Could not open settings file %s\n", file_name);
918 return false;
919 } else {
920 return true;
921 }
922 }
923
924 char token[1024];
925 int pos = 0;
926
927 bool in_white_space = true;
928 bool in_comment = false;
929 bool in_quote = false;
930 char quote_c = 0;
931 bool result = true;
932
933 int c = getc(stream);
934 while(c != EOF && pos < (int)(sizeof(token)-1)) {
935 if (in_white_space) {
936 if (in_comment) {
937 if (c == '\n') in_comment = false;
938 } else {
939 if (c == '#') in_comment = true;
940 else if (!isspace(c)) {
941 in_white_space = false;
942 token[pos++] = c;
943 }
944 }
945 } else {
946 if (c == '\n' || (!in_quote && isspace(c))) {
947 // token ends at newline, or at unquoted whitespace
948 // this allows a way to include spaces in string-valued options
949 token[pos] = '\0';
950 logOption(token);
951 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
952 build_jvm_flags(token);
953 pos = 0;
954 in_white_space = true;
955 in_quote = false;
956 } else if (!in_quote && (c == '\'' || c == '"')) {
957 in_quote = true;
958 quote_c = c;
959 } else if (in_quote && (c == quote_c)) {
960 in_quote = false;
961 } else {
962 token[pos++] = c;
963 }
964 }
965 c = getc(stream);
966 }
967 if (pos > 0) {
968 token[pos] = '\0';
969 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
970 build_jvm_flags(token);
971 }
972 fclose(stream);
973 return result;
974 }
975
976 //=============================================================================================================
977 // Parsing of properties (-D)
978
979 const char* Arguments::get_property(const char* key) {
980 return PropertyList_get_value(system_properties(), key);
981 }
982
983 bool Arguments::add_property(const char* prop) {
984 const char* eq = strchr(prop, '=');
985 char* key;
986 // ns must be static--its address may be stored in a SystemProperty object.
987 const static char ns[1] = {0};
988 char* value = (char *)ns;
989
990 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
991 key = AllocateHeap(key_len + 1, mtInternal);
992 strncpy(key, prop, key_len);
993 key[key_len] = '\0';
994
995 if (eq != NULL) {
996 size_t value_len = strlen(prop) - key_len - 1;
997 value = AllocateHeap(value_len + 1, mtInternal);
998 strncpy(value, &prop[key_len + 1], value_len + 1);
999 }
1000
1001 if (strcmp(key, "java.compiler") == 0) {
1002 process_java_compiler_argument(value);
1003 FreeHeap(key);
1004 if (eq != NULL) {
1005 FreeHeap(value);
1006 }
1007 return true;
1008 } else if (strcmp(key, "sun.java.command") == 0) {
1009 _java_command = value;
1010
1011 // Record value in Arguments, but let it get passed to Java.
1012 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1013 // launcher.pid property is private and is processed
1014 // in process_sun_java_launcher_properties();
1015 // the sun.java.launcher property is passed on to the java application
1016 FreeHeap(key);
1017 if (eq != NULL) {
1018 FreeHeap(value);
1019 }
1020 return true;
1021 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1022 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1023 // its value without going through the property list or making a Java call.
1024 _java_vendor_url_bug = value;
1025 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1026 PropertyList_unique_add(&_system_properties, key, value, true);
1027 return true;
1028 }
1029 // Create new property and add at the end of the list
1030 PropertyList_unique_add(&_system_properties, key, value);
1031 return true;
1032 }
1033
1034 //===========================================================================================================
1035 // Setting int/mixed/comp mode flags
1036
1037 void Arguments::set_mode_flags(Mode mode) {
1038 // Set up default values for all flags.
1039 // If you add a flag to any of the branches below,
1040 // add a default value for it here.
1041 set_java_compiler(false);
1042 _mode = mode;
1043
1044 // Ensure Agent_OnLoad has the correct initial values.
1045 // This may not be the final mode; mode may change later in onload phase.
1046 PropertyList_unique_add(&_system_properties, "java.vm.info",
1047 (char*)VM_Version::vm_info_string(), false);
1048
1049 UseInterpreter = true;
1050 UseCompiler = true;
1051 UseLoopCounter = true;
1052
1053 #ifndef ZERO
1054 // Turn these off for mixed and comp. Leave them on for Zero.
1055 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1056 UseFastAccessorMethods = (mode == _int);
1057 }
1058 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1059 UseFastEmptyMethods = (mode == _int);
1060 }
1061 #endif
1062
1063 // Default values may be platform/compiler dependent -
1064 // use the saved values
1065 ClipInlining = Arguments::_ClipInlining;
1066 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1067 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1068 BackgroundCompilation = Arguments::_BackgroundCompilation;
1069
1070 // Change from defaults based on mode
1071 switch (mode) {
1072 default:
1073 ShouldNotReachHere();
1074 break;
1075 case _int:
1076 UseCompiler = false;
1077 UseLoopCounter = false;
1078 AlwaysCompileLoopMethods = false;
1079 UseOnStackReplacement = false;
1080 break;
1081 case _mixed:
1082 // same as default
1083 break;
1084 case _comp:
1085 UseInterpreter = false;
1086 BackgroundCompilation = false;
1087 ClipInlining = false;
1088 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1089 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1090 // compile a level 4 (C2) and then continue executing it.
1091 if (TieredCompilation) {
1092 Tier3InvokeNotifyFreqLog = 0;
1093 Tier4InvocationThreshold = 0;
1094 }
1095 break;
1096 }
1097 }
1098
1099 // Conflict: required to use shared spaces (-Xshare:on), but
1100 // incompatible command line options were chosen.
1101
1102 static void no_shared_spaces() {
1103 if (RequireSharedSpaces) {
1104 jio_fprintf(defaultStream::error_stream(),
1105 "Class data sharing is inconsistent with other specified options.\n");
1106 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1107 } else {
1108 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1109 }
1110 }
1111
1112 void Arguments::set_tiered_flags() {
1113 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1114 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1115 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1116 }
1117 if (CompilationPolicyChoice < 2) {
1118 vm_exit_during_initialization(
1119 "Incompatible compilation policy selected", NULL);
1120 }
1121 // Increase the code cache size - tiered compiles a lot more.
1122 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1123 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1124 }
1125 if (!UseInterpreter) { // -Xcomp
1126 Tier3InvokeNotifyFreqLog = 0;
1127 Tier4InvocationThreshold = 0;
1128 }
1129 }
1130
1131 #if INCLUDE_ALL_GCS
1132 static void disable_adaptive_size_policy(const char* collector_name) {
1133 if (UseAdaptiveSizePolicy) {
1134 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1135 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1136 collector_name);
1137 }
1138 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1139 }
1140 }
1141
1142 void Arguments::set_parnew_gc_flags() {
1143 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1144 "control point invariant");
1145 assert(UseParNewGC, "Error");
1146
1147 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1148 disable_adaptive_size_policy("UseParNewGC");
1149
1150 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1151 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1152 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1153 } else if (ParallelGCThreads == 0) {
1154 jio_fprintf(defaultStream::error_stream(),
1155 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1156 vm_exit(1);
1157 }
1158
1159 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1160 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1161 // we set them to 1024 and 1024.
1162 // See CR 6362902.
1163 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1164 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1165 }
1166 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1167 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1168 }
1169
1170 // AlwaysTenure flag should make ParNew promote all at first collection.
1171 // See CR 6362902.
1172 if (AlwaysTenure) {
1173 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1174 }
1175 // When using compressed oops, we use local overflow stacks,
1176 // rather than using a global overflow list chained through
1177 // the klass word of the object's pre-image.
1178 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1179 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1180 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1181 }
1182 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1183 }
1184 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1185 }
1186
1187 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1188 // sparc/solaris for certain applications, but would gain from
1189 // further optimization and tuning efforts, and would almost
1190 // certainly gain from analysis of platform and environment.
1191 void Arguments::set_cms_and_parnew_gc_flags() {
1192 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1193 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1194
1195 // If we are using CMS, we prefer to UseParNewGC,
1196 // unless explicitly forbidden.
1197 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1198 FLAG_SET_ERGO(bool, UseParNewGC, true);
1199 }
1200
1201 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1202 disable_adaptive_size_policy("UseConcMarkSweepGC");
1203
1204 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1205 // as needed.
1206 if (UseParNewGC) {
1207 set_parnew_gc_flags();
1208 }
1209
1210 size_t max_heap = align_size_down(MaxHeapSize,
1211 CardTableRS::ct_max_alignment_constraint());
1212
1213 // Now make adjustments for CMS
1214 intx tenuring_default = (intx)6;
1215 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1216
1217 // Preferred young gen size for "short" pauses:
1218 // upper bound depends on # of threads and NewRatio.
1219 const uintx parallel_gc_threads =
1220 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1221 const size_t preferred_max_new_size_unaligned =
1222 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1223 size_t preferred_max_new_size =
1224 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1225
1226 // Unless explicitly requested otherwise, size young gen
1227 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1228
1229 // If either MaxNewSize or NewRatio is set on the command line,
1230 // assume the user is trying to set the size of the young gen.
1231 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1232
1233 // Set MaxNewSize to our calculated preferred_max_new_size unless
1234 // NewSize was set on the command line and it is larger than
1235 // preferred_max_new_size.
1236 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1237 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1238 } else {
1239 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1240 }
1241 if (PrintGCDetails && Verbose) {
1242 // Too early to use gclog_or_tty
1243 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1244 }
1245
1246 // Code along this path potentially sets NewSize and OldSize
1247 if (PrintGCDetails && Verbose) {
1248 // Too early to use gclog_or_tty
1249 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1250 " initial_heap_size: " SIZE_FORMAT
1251 " max_heap: " SIZE_FORMAT,
1252 min_heap_size(), InitialHeapSize, max_heap);
1253 }
1254 size_t min_new = preferred_max_new_size;
1255 if (FLAG_IS_CMDLINE(NewSize)) {
1256 min_new = NewSize;
1257 }
1258 if (max_heap > min_new && min_heap_size() > min_new) {
1259 // Unless explicitly requested otherwise, make young gen
1260 // at least min_new, and at most preferred_max_new_size.
1261 if (FLAG_IS_DEFAULT(NewSize)) {
1262 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1263 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1264 if (PrintGCDetails && Verbose) {
1265 // Too early to use gclog_or_tty
1266 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1267 }
1268 }
1269 // Unless explicitly requested otherwise, size old gen
1270 // so it's NewRatio x of NewSize.
1271 if (FLAG_IS_DEFAULT(OldSize)) {
1272 if (max_heap > NewSize) {
1273 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1274 if (PrintGCDetails && Verbose) {
1275 // Too early to use gclog_or_tty
1276 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1277 }
1278 }
1279 }
1280 }
1281 }
1282 // Unless explicitly requested otherwise, definitely
1283 // promote all objects surviving "tenuring_default" scavenges.
1284 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1285 FLAG_IS_DEFAULT(SurvivorRatio)) {
1286 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1287 }
1288 // If we decided above (or user explicitly requested)
1289 // `promote all' (via MaxTenuringThreshold := 0),
1290 // prefer minuscule survivor spaces so as not to waste
1291 // space for (non-existent) survivors
1292 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1293 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1294 }
1295 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1296 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1297 // This is done in order to make ParNew+CMS configuration to work
1298 // with YoungPLABSize and OldPLABSize options.
1299 // See CR 6362902.
1300 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1301 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1302 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1303 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1304 // the value (either from the command line or ergonomics) of
1305 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1306 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1307 } else {
1308 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1309 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1310 // we'll let it to take precedence.
1311 jio_fprintf(defaultStream::error_stream(),
1312 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1313 " options are specified for the CMS collector."
1314 " CMSParPromoteBlocksToClaim will take precedence.\n");
1315 }
1316 }
1317 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1318 // OldPLAB sizing manually turned off: Use a larger default setting,
1319 // unless it was manually specified. This is because a too-low value
1320 // will slow down scavenges.
1321 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1322 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1323 }
1324 }
1325 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1326 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1327 // If either of the static initialization defaults have changed, note this
1328 // modification.
1329 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1330 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1331 }
1332 if (PrintGCDetails && Verbose) {
1333 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1334 MarkStackSize / K, MarkStackSizeMax / K);
1335 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1336 }
1337 }
1338 #endif // INCLUDE_ALL_GCS
1339
1340 void set_object_alignment() {
1341 // Object alignment.
1342 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1343 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1344 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1345 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1346 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1347 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1348
1349 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1350 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1351
1352 // Oop encoding heap max
1353 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1354
1355 #if INCLUDE_ALL_GCS
1356 // Set CMS global values
1357 CompactibleFreeListSpace::set_cms_values();
1358 #endif // INCLUDE_ALL_GCS
1359 }
1360
1361 bool verify_object_alignment() {
1362 // Object alignment.
1363 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1364 jio_fprintf(defaultStream::error_stream(),
1365 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1366 (int)ObjectAlignmentInBytes);
1367 return false;
1368 }
1369 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1370 jio_fprintf(defaultStream::error_stream(),
1371 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1372 (int)ObjectAlignmentInBytes, BytesPerLong);
1373 return false;
1374 }
1375 // It does not make sense to have big object alignment
1376 // since a space lost due to alignment will be greater
1377 // then a saved space from compressed oops.
1378 if ((int)ObjectAlignmentInBytes > 256) {
1379 jio_fprintf(defaultStream::error_stream(),
1380 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1381 (int)ObjectAlignmentInBytes);
1382 return false;
1383 }
1384 // In case page size is very small.
1385 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1386 jio_fprintf(defaultStream::error_stream(),
1387 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1388 (int)ObjectAlignmentInBytes, os::vm_page_size());
1389 return false;
1390 }
1391 return true;
1392 }
1393
1394 inline uintx max_heap_for_compressed_oops() {
1395 // Avoid sign flip.
1396 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) {
1397 return 0;
1398 }
1399 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size());
1400 NOT_LP64(ShouldNotReachHere(); return 0);
1401 }
1402
1403 bool Arguments::should_auto_select_low_pause_collector() {
1404 if (UseAutoGCSelectPolicy &&
1405 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1406 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1407 if (PrintGCDetails) {
1408 // Cannot use gclog_or_tty yet.
1409 tty->print_cr("Automatic selection of the low pause collector"
1410 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1411 }
1412 return true;
1413 }
1414 return false;
1415 }
1416
1417 void Arguments::set_use_compressed_oops() {
1418 #ifndef ZERO
1419 #ifdef _LP64
1420 // MaxHeapSize is not set up properly at this point, but
1421 // the only value that can override MaxHeapSize if we are
1422 // to use UseCompressedOops is InitialHeapSize.
1423 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1424
1425 if (max_heap_size <= max_heap_for_compressed_oops()) {
1426 #if !defined(COMPILER1) || defined(TIERED)
1427 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1428 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1429 }
1430 #endif
1431 #ifdef _WIN64
1432 if (UseLargePages && UseCompressedOops) {
1433 // Cannot allocate guard pages for implicit checks in indexed addressing
1434 // mode, when large pages are specified on windows.
1435 // This flag could be switched ON if narrow oop base address is set to 0,
1436 // see code in Universe::initialize_heap().
1437 Universe::set_narrow_oop_use_implicit_null_checks(false);
1438 }
1439 #endif // _WIN64
1440 } else {
1441 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1442 warning("Max heap size too large for Compressed Oops");
1443 FLAG_SET_DEFAULT(UseCompressedOops, false);
1444 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1445 }
1446 }
1447 #endif // _LP64
1448 #endif // ZERO
1449 }
1450
1451 void Arguments::set_ergonomics_flags() {
1452
1453 if (os::is_server_class_machine()) {
1454 // If no other collector is requested explicitly,
1455 // let the VM select the collector based on
1456 // machine class and automatic selection policy.
1457 if (!UseSerialGC &&
1458 !UseConcMarkSweepGC &&
1459 !UseG1GC &&
1460 !UseParNewGC &&
1461 FLAG_IS_DEFAULT(UseParallelGC)) {
1462 if (should_auto_select_low_pause_collector()) {
1463 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1464 } else {
1465 FLAG_SET_ERGO(bool, UseParallelGC, true);
1466 }
1467 }
1468 // Shared spaces work fine with other GCs but causes bytecode rewriting
1469 // to be disabled, which hurts interpreter performance and decreases
1470 // server performance. On server class machines, keep the default
1471 // off unless it is asked for. Future work: either add bytecode rewriting
1472 // at link time, or rewrite bytecodes in non-shared methods.
1473 if (!DumpSharedSpaces && !RequireSharedSpaces) {
1474 no_shared_spaces();
1475 }
1476 }
1477
1478 #ifndef ZERO
1479 #ifdef _LP64
1480 set_use_compressed_oops();
1481 // UseCompressedOops must be on for UseCompressedKlassPointers to be on.
1482 if (!UseCompressedOops) {
1483 if (UseCompressedKlassPointers) {
1484 warning("UseCompressedKlassPointers requires UseCompressedOops");
1485 }
1486 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1487 } else {
1488 // Turn on UseCompressedKlassPointers too
1489 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) {
1490 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true);
1491 }
1492 // Set the ClassMetaspaceSize to something that will not need to be
1493 // expanded, since it cannot be expanded.
1494 if (UseCompressedKlassPointers) {
1495 if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) {
1496 warning("Class metaspace size is too large for UseCompressedKlassPointers");
1497 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1498 } else if (FLAG_IS_DEFAULT(ClassMetaspaceSize)) {
1499 // 100,000 classes seems like a good size, so 100M assumes around 1K
1500 // per klass. The vtable and oopMap is embedded so we don't have a fixed
1501 // size per klass. Eventually, this will be parameterized because it
1502 // would also be useful to determine the optimal size of the
1503 // systemDictionary.
1504 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M);
1505 }
1506 }
1507 }
1508 // Also checks that certain machines are slower with compressed oops
1509 // in vm_version initialization code.
1510 #endif // _LP64
1511 #endif // !ZERO
1512 }
1513
1514 void Arguments::set_parallel_gc_flags() {
1515 assert(UseParallelGC || UseParallelOldGC, "Error");
1516 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1517 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1518 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1519 }
1520 FLAG_SET_DEFAULT(UseParallelGC, true);
1521
1522 // If no heap maximum was requested explicitly, use some reasonable fraction
1523 // of the physical memory, up to a maximum of 1GB.
1524 FLAG_SET_DEFAULT(ParallelGCThreads,
1525 Abstract_VM_Version::parallel_worker_threads());
1526 if (ParallelGCThreads == 0) {
1527 jio_fprintf(defaultStream::error_stream(),
1528 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1529 vm_exit(1);
1530 }
1531
1532
1533 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1534 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1535 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1536 // See CR 6362902 for details.
1537 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1538 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1539 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1540 }
1541 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1542 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1543 }
1544 }
1545
1546 if (UseParallelOldGC) {
1547 // Par compact uses lower default values since they are treated as
1548 // minimums. These are different defaults because of the different
1549 // interpretation and are not ergonomically set.
1550 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1551 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1552 }
1553 }
1554 }
1555
1556 void Arguments::set_g1_gc_flags() {
1557 assert(UseG1GC, "Error");
1558 #ifdef COMPILER1
1559 FastTLABRefill = false;
1560 #endif
1561 FLAG_SET_DEFAULT(ParallelGCThreads,
1562 Abstract_VM_Version::parallel_worker_threads());
1563 if (ParallelGCThreads == 0) {
1564 FLAG_SET_DEFAULT(ParallelGCThreads,
1565 Abstract_VM_Version::parallel_worker_threads());
1566 }
1567
1568 // MarkStackSize will be set (if it hasn't been set by the user)
1569 // when concurrent marking is initialized.
1570 // Its value will be based upon the number of parallel marking threads.
1571 // But we do set the maximum mark stack size here.
1572 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1573 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1574 }
1575
1576 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1577 // In G1, we want the default GC overhead goal to be higher than
1578 // say in PS. So we set it here to 10%. Otherwise the heap might
1579 // be expanded more aggressively than we would like it to. In
1580 // fact, even 10% seems to not be high enough in some cases
1581 // (especially small GC stress tests that the main thing they do
1582 // is allocation). We might consider increase it further.
1583 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1584 }
1585
1586 if (PrintGCDetails && Verbose) {
1587 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1588 MarkStackSize / K, MarkStackSizeMax / K);
1589 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1590 }
1591 }
1592
1593 julong Arguments::limit_by_allocatable_memory(julong limit) {
1594 julong max_allocatable;
1595 julong result = limit;
1596 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1597 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1598 }
1599 return result;
1600 }
1601
1602 void Arguments::set_heap_base_min_address() {
1603 if (FLAG_IS_DEFAULT(HeapBaseMinAddress) && UseG1GC && HeapBaseMinAddress < 1*G) {
1604 // By default HeapBaseMinAddress is 2G on all platforms except Solaris x86.
1605 // G1 currently needs a lot of C-heap, so on Solaris we have to give G1
1606 // some extra space for the C-heap compared to other collectors.
1607 // Use FLAG_SET_DEFAULT here rather than FLAG_SET_ERGO to make sure that
1608 // code that checks for default values work correctly.
1609 FLAG_SET_DEFAULT(HeapBaseMinAddress, 1*G);
1610 }
1611 }
1612
1613 void Arguments::set_heap_size() {
1614 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1615 // Deprecated flag
1616 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1617 }
1618
1619 const julong phys_mem =
1620 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1621 : (julong)MaxRAM;
1622
1623 // If the maximum heap size has not been set with -Xmx,
1624 // then set it as fraction of the size of physical memory,
1625 // respecting the maximum and minimum sizes of the heap.
1626 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1627 julong reasonable_max = phys_mem / MaxRAMFraction;
1628
1629 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1630 // Small physical memory, so use a minimum fraction of it for the heap
1631 reasonable_max = phys_mem / MinRAMFraction;
1632 } else {
1633 // Not-small physical memory, so require a heap at least
1634 // as large as MaxHeapSize
1635 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1636 }
1637 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1638 // Limit the heap size to ErgoHeapSizeLimit
1639 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1640 }
1641 if (UseCompressedOops) {
1642 // Limit the heap size to the maximum possible when using compressed oops
1643 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1644 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1645 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1646 // but it should be not less than default MaxHeapSize.
1647 max_coop_heap -= HeapBaseMinAddress;
1648 }
1649 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1650 }
1651 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1652
1653 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1654 // An initial heap size was specified on the command line,
1655 // so be sure that the maximum size is consistent. Done
1656 // after call to limit_by_allocatable_memory because that
1657 // method might reduce the allocation size.
1658 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1659 }
1660
1661 if (PrintGCDetails && Verbose) {
1662 // Cannot use gclog_or_tty yet.
1663 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1664 }
1665 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1666 }
1667
1668 // If the minimum or initial heap_size have not been set or requested to be set
1669 // ergonomically, set them accordingly.
1670 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1671 julong reasonable_minimum = (julong)(OldSize + NewSize);
1672
1673 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1674
1675 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1676
1677 if (InitialHeapSize == 0) {
1678 julong reasonable_initial = phys_mem / InitialRAMFraction;
1679
1680 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1681 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1682
1683 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1684
1685 if (PrintGCDetails && Verbose) {
1686 // Cannot use gclog_or_tty yet.
1687 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1688 }
1689 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1690 }
1691 // If the minimum heap size has not been set (via -Xms),
1692 // synchronize with InitialHeapSize to avoid errors with the default value.
1693 if (min_heap_size() == 0) {
1694 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1695 if (PrintGCDetails && Verbose) {
1696 // Cannot use gclog_or_tty yet.
1697 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1698 }
1699 }
1700 }
1701 }
1702
1703 // This must be called after ergonomics because we want bytecode rewriting
1704 // if the server compiler is used, or if UseSharedSpaces is disabled.
1705 void Arguments::set_bytecode_flags() {
1706 // Better not attempt to store into a read-only space.
1707 if (UseSharedSpaces) {
1708 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1709 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1710 }
1711
1712 if (!RewriteBytecodes) {
1713 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1714 }
1715 }
1716
1717 // Aggressive optimization flags -XX:+AggressiveOpts
1718 void Arguments::set_aggressive_opts_flags() {
1719 #ifdef COMPILER2
1720 if (AggressiveUnboxing) {
1721 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1722 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1723 } else if (!EliminateAutoBox) {
1724 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1725 AggressiveUnboxing = false;
1726 }
1727 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1728 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1729 } else if (!DoEscapeAnalysis) {
1730 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1731 AggressiveUnboxing = false;
1732 }
1733 }
1734 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1735 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1736 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1737 }
1738 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1739 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1740 }
1741
1742 // Feed the cache size setting into the JDK
1743 char buffer[1024];
1744 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1745 add_property(buffer);
1746 }
1747 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1748 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1749 }
1750 #endif
1751
1752 if (AggressiveOpts) {
1753 // Sample flag setting code
1754 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1755 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1756 // }
1757 }
1758 }
1759
1760 //===========================================================================================================
1761 // Parsing of java.compiler property
1762
1763 void Arguments::process_java_compiler_argument(char* arg) {
1764 // For backwards compatibility, Djava.compiler=NONE or ""
1765 // causes us to switch to -Xint mode UNLESS -Xdebug
1766 // is also specified.
1767 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1768 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1769 }
1770 }
1771
1772 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1773 _sun_java_launcher = strdup(launcher);
1774 if (strcmp("gamma", _sun_java_launcher) == 0) {
1775 _created_by_gamma_launcher = true;
1776 }
1777 }
1778
1779 bool Arguments::created_by_java_launcher() {
1780 assert(_sun_java_launcher != NULL, "property must have value");
1781 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1782 }
1783
1784 bool Arguments::created_by_gamma_launcher() {
1785 return _created_by_gamma_launcher;
1786 }
1787
1788 //===========================================================================================================
1789 // Parsing of main arguments
1790
1791 bool Arguments::verify_interval(uintx val, uintx min,
1792 uintx max, const char* name) {
1793 // Returns true iff value is in the inclusive interval [min..max]
1794 // false, otherwise.
1795 if (val >= min && val <= max) {
1796 return true;
1797 }
1798 jio_fprintf(defaultStream::error_stream(),
1799 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1800 " and " UINTX_FORMAT "\n",
1801 name, val, min, max);
1802 return false;
1803 }
1804
1805 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1806 // Returns true if given value is at least specified min threshold
1807 // false, otherwise.
1808 if (val >= min ) {
1809 return true;
1810 }
1811 jio_fprintf(defaultStream::error_stream(),
1812 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1813 name, val, min);
1814 return false;
1815 }
1816
1817 bool Arguments::verify_percentage(uintx value, const char* name) {
1818 if (value <= 100) {
1819 return true;
1820 }
1821 jio_fprintf(defaultStream::error_stream(),
1822 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1823 name, value);
1824 return false;
1825 }
1826
1827 #if !INCLUDE_ALL_GCS
1828 #ifdef ASSERT
1829 static bool verify_serial_gc_flags() {
1830 return (UseSerialGC &&
1831 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1832 UseParallelGC || UseParallelOldGC));
1833 }
1834 #endif // ASSERT
1835 #endif // INCLUDE_ALL_GCS
1836
1837 // check if do gclog rotation
1838 // +UseGCLogFileRotation is a must,
1839 // no gc log rotation when log file not supplied or
1840 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1841 void check_gclog_consistency() {
1842 if (UseGCLogFileRotation) {
1843 if ((Arguments::gc_log_filename() == NULL) ||
1844 (NumberOfGCLogFiles == 0) ||
1845 (GCLogFileSize == 0)) {
1846 jio_fprintf(defaultStream::output_stream(),
1847 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1848 "where num_of_file > 0 and num_of_size > 0\n"
1849 "GC log rotation is turned off\n");
1850 UseGCLogFileRotation = false;
1851 }
1852 }
1853
1854 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1855 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1856 jio_fprintf(defaultStream::output_stream(),
1857 "GCLogFileSize changed to minimum 8K\n");
1858 }
1859 }
1860
1861 // Check consistency of GC selection
1862 bool Arguments::check_gc_consistency() {
1863 check_gclog_consistency();
1864 bool status = true;
1865 // Ensure that the user has not selected conflicting sets
1866 // of collectors. [Note: this check is merely a user convenience;
1867 // collectors over-ride each other so that only a non-conflicting
1868 // set is selected; however what the user gets is not what they
1869 // may have expected from the combination they asked for. It's
1870 // better to reduce user confusion by not allowing them to
1871 // select conflicting combinations.
1872 uint i = 0;
1873 if (UseSerialGC) i++;
1874 if (UseConcMarkSweepGC || UseParNewGC) i++;
1875 if (UseParallelGC || UseParallelOldGC) i++;
1876 if (UseG1GC) i++;
1877 if (i > 1) {
1878 jio_fprintf(defaultStream::error_stream(),
1879 "Conflicting collector combinations in option list; "
1880 "please refer to the release notes for the combinations "
1881 "allowed\n");
1882 status = false;
1883 } else if (ReservedCodeCacheSize > 2*G) {
1884 // Code cache size larger than MAXINT is not supported.
1885 jio_fprintf(defaultStream::error_stream(),
1886 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
1887 (2*G)/M);
1888 status = false;
1889 }
1890 return status;
1891 }
1892
1893 void Arguments::check_deprecated_gcs() {
1894 if (UseConcMarkSweepGC && !UseParNewGC) {
1895 warning("Using the DefNew young collector with the CMS collector is deprecated "
1896 "and will likely be removed in a future release");
1897 }
1898
1899 if (UseParNewGC && !UseConcMarkSweepGC) {
1900 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1901 // set up UseSerialGC properly, so that can't be used in the check here.
1902 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1903 "and will likely be removed in a future release");
1904 }
1905
1906 if (CMSIncrementalMode) {
1907 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1908 }
1909 }
1910
1911 void Arguments::check_deprecated_gc_flags() {
1912 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
1913 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
1914 "and will likely be removed in future release");
1915 }
1916 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
1917 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
1918 "Use MaxRAMFraction instead.");
1919 }
1920 }
1921
1922 // Check stack pages settings
1923 bool Arguments::check_stack_pages()
1924 {
1925 bool status = true;
1926 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1927 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1928 // greater stack shadow pages can't generate instruction to bang stack
1929 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1930 return status;
1931 }
1932
1933 // Check the consistency of vm_init_args
1934 bool Arguments::check_vm_args_consistency() {
1935 // Method for adding checks for flag consistency.
1936 // The intent is to warn the user of all possible conflicts,
1937 // before returning an error.
1938 // Note: Needs platform-dependent factoring.
1939 bool status = true;
1940
1941 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1942 // builds so the cost of stack banging can be measured.
1943 #if (defined(PRODUCT) && defined(SOLARIS))
1944 if (!UseBoundThreads && !UseStackBanging) {
1945 jio_fprintf(defaultStream::error_stream(),
1946 "-UseStackBanging conflicts with -UseBoundThreads\n");
1947
1948 status = false;
1949 }
1950 #endif
1951
1952 if (TLABRefillWasteFraction == 0) {
1953 jio_fprintf(defaultStream::error_stream(),
1954 "TLABRefillWasteFraction should be a denominator, "
1955 "not " SIZE_FORMAT "\n",
1956 TLABRefillWasteFraction);
1957 status = false;
1958 }
1959
1960 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
1961 "AdaptiveSizePolicyWeight");
1962 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1963 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1964 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1965
1966 // Divide by bucket size to prevent a large size from causing rollover when
1967 // calculating amount of memory needed to be allocated for the String table.
1968 status = status && verify_interval(StringTableSize, minimumStringTableSize,
1969 (max_uintx / StringTable::bucket_size()), "StringTable size");
1970
1971 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1972 jio_fprintf(defaultStream::error_stream(),
1973 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1974 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1975 MinHeapFreeRatio, MaxHeapFreeRatio);
1976 status = false;
1977 }
1978 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1979 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1980
1981 // Min/MaxMetaspaceFreeRatio
1982 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
1983 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
1984
1985 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
1986 jio_fprintf(defaultStream::error_stream(),
1987 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
1988 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
1989 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
1990 MinMetaspaceFreeRatio,
1991 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
1992 MaxMetaspaceFreeRatio);
1993 status = false;
1994 }
1995
1996 // Trying to keep 100% free is not practical
1997 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
1998
1999 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2000 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2001 }
2002
2003 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2004 // Settings to encourage splitting.
2005 if (!FLAG_IS_CMDLINE(NewRatio)) {
2006 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2007 }
2008 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2009 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2010 }
2011 }
2012
2013 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2014 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2015 if (GCTimeLimit == 100) {
2016 // Turn off gc-overhead-limit-exceeded checks
2017 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2018 }
2019
2020 status = status && check_gc_consistency();
2021 status = status && check_stack_pages();
2022
2023 if (CMSIncrementalMode) {
2024 if (!UseConcMarkSweepGC) {
2025 jio_fprintf(defaultStream::error_stream(),
2026 "error: invalid argument combination.\n"
2027 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2028 "selected in order\nto use CMSIncrementalMode.\n");
2029 status = false;
2030 } else {
2031 status = status && verify_percentage(CMSIncrementalDutyCycle,
2032 "CMSIncrementalDutyCycle");
2033 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2034 "CMSIncrementalDutyCycleMin");
2035 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2036 "CMSIncrementalSafetyFactor");
2037 status = status && verify_percentage(CMSIncrementalOffset,
2038 "CMSIncrementalOffset");
2039 status = status && verify_percentage(CMSExpAvgFactor,
2040 "CMSExpAvgFactor");
2041 // If it was not set on the command line, set
2042 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2043 if (CMSInitiatingOccupancyFraction < 0) {
2044 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2045 }
2046 }
2047 }
2048
2049 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2050 // insists that we hold the requisite locks so that the iteration is
2051 // MT-safe. For the verification at start-up and shut-down, we don't
2052 // yet have a good way of acquiring and releasing these locks,
2053 // which are not visible at the CollectedHeap level. We want to
2054 // be able to acquire these locks and then do the iteration rather
2055 // than just disable the lock verification. This will be fixed under
2056 // bug 4788986.
2057 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2058 if (VerifyDuringStartup) {
2059 warning("Heap verification at start-up disabled "
2060 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2061 VerifyDuringStartup = false; // Disable verification at start-up
2062 }
2063
2064 if (VerifyBeforeExit) {
2065 warning("Heap verification at shutdown disabled "
2066 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2067 VerifyBeforeExit = false; // Disable verification at shutdown
2068 }
2069 }
2070
2071 // Note: only executed in non-PRODUCT mode
2072 if (!UseAsyncConcMarkSweepGC &&
2073 (ExplicitGCInvokesConcurrent ||
2074 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2075 jio_fprintf(defaultStream::error_stream(),
2076 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2077 " with -UseAsyncConcMarkSweepGC");
2078 status = false;
2079 }
2080
2081 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2082
2083 #if INCLUDE_ALL_GCS
2084 if (UseG1GC) {
2085 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2086 "InitiatingHeapOccupancyPercent");
2087 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2088 "G1RefProcDrainInterval");
2089 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2090 "G1ConcMarkStepDurationMillis");
2091 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2092 "G1ConcRSHotCardLimit");
2093 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2094 "G1ConcRSLogCacheSize");
2095 }
2096 if (UseConcMarkSweepGC) {
2097 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2098 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2099 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2100 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2101
2102 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2103
2104 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2105 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2106 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2107
2108 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2109
2110 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2111 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2112
2113 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2114 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2115 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2116
2117 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2118
2119 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2120
2121 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2122 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2123 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2124 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2125 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2126 }
2127
2128 if (UseParallelGC || UseParallelOldGC) {
2129 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2130 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2131
2132 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2133 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2134
2135 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2136 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2137
2138 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2139
2140 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2141 }
2142 #endif // INCLUDE_ALL_GCS
2143
2144 status = status && verify_interval(RefDiscoveryPolicy,
2145 ReferenceProcessor::DiscoveryPolicyMin,
2146 ReferenceProcessor::DiscoveryPolicyMax,
2147 "RefDiscoveryPolicy");
2148
2149 // Limit the lower bound of this flag to 1 as it is used in a division
2150 // expression.
2151 status = status && verify_interval(TLABWasteTargetPercent,
2152 1, 100, "TLABWasteTargetPercent");
2153
2154 status = status && verify_object_alignment();
2155
2156 status = status && verify_min_value(ClassMetaspaceSize, 1*M,
2157 "ClassMetaspaceSize");
2158
2159 status = status && verify_interval(MarkStackSizeMax,
2160 1, (max_jint - 1), "MarkStackSizeMax");
2161 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2162
2163 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2164
2165 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2166
2167 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2168
2169 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2170 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2171
2172 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2173
2174 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2175 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2176 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2177 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2178
2179 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2180 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2181
2182 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2183 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2184 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2185
2186 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2187 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2188
2189 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2190 // just for that, so hardcode here.
2191 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2192 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2193 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2194 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2195
2196 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2197 #ifdef SPARC
2198 if (UseConcMarkSweepGC || UseG1GC) {
2199 // Issue a stern warning if the user has explicitly set
2200 // UseMemSetInBOT (it is known to cause issues), but allow
2201 // use for experimentation and debugging.
2202 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2203 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2204 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2205 " on sun4v; please understand that you are using at your own risk!");
2206 }
2207 }
2208 #endif // SPARC
2209
2210 if (PrintNMTStatistics) {
2211 #if INCLUDE_NMT
2212 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2213 #endif // INCLUDE_NMT
2214 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2215 PrintNMTStatistics = false;
2216 #if INCLUDE_NMT
2217 }
2218 #endif
2219 }
2220
2221 // Need to limit the extent of the padding to reasonable size.
2222 // 8K is well beyond the reasonable HW cache line size, even with the
2223 // aggressive prefetching, while still leaving the room for segregating
2224 // among the distinct pages.
2225 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2226 jio_fprintf(defaultStream::error_stream(),
2227 "ContendedPaddingWidth=" INTX_FORMAT " must be the between %d and %d\n",
2228 ContendedPaddingWidth, 0, 8192);
2229 status = false;
2230 }
2231
2232 // Need to enforce the padding not to break the existing field alignments.
2233 // It is sufficient to check against the largest type size.
2234 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2235 jio_fprintf(defaultStream::error_stream(),
2236 "ContendedPaddingWidth=" INTX_FORMAT " must be the multiple of %d\n",
2237 ContendedPaddingWidth, BytesPerLong);
2238 status = false;
2239 }
2240
2241 // Check lower bounds of the code cache
2242 // Template Interpreter code is approximately 3X larger in debug builds.
2243 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2244 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2245 jio_fprintf(defaultStream::error_stream(),
2246 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2247 os::vm_page_size()/K);
2248 status = false;
2249 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2250 jio_fprintf(defaultStream::error_stream(),
2251 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2252 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2253 status = false;
2254 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2255 jio_fprintf(defaultStream::error_stream(),
2256 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2257 min_code_cache_size/K);
2258 status = false;
2259 } else if (ReservedCodeCacheSize > 2*G) {
2260 // Code cache size larger than MAXINT is not supported.
2261 jio_fprintf(defaultStream::error_stream(),
2262 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2263 (2*G)/M);
2264 status = false;
2265 }
2266 return status;
2267 }
2268
2269 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2270 const char* option_type) {
2271 if (ignore) return false;
2272
2273 const char* spacer = " ";
2274 if (option_type == NULL) {
2275 option_type = ++spacer; // Set both to the empty string.
2276 }
2277
2278 if (os::obsolete_option(option)) {
2279 jio_fprintf(defaultStream::error_stream(),
2280 "Obsolete %s%soption: %s\n", option_type, spacer,
2281 option->optionString);
2282 return false;
2283 } else {
2284 jio_fprintf(defaultStream::error_stream(),
2285 "Unrecognized %s%soption: %s\n", option_type, spacer,
2286 option->optionString);
2287 return true;
2288 }
2289 }
2290
2291 static const char* user_assertion_options[] = {
2292 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2293 };
2294
2295 static const char* system_assertion_options[] = {
2296 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2297 };
2298
2299 // Return true if any of the strings in null-terminated array 'names' matches.
2300 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2301 // the option must match exactly.
2302 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2303 bool tail_allowed) {
2304 for (/* empty */; *names != NULL; ++names) {
2305 if (match_option(option, *names, tail)) {
2306 if (**tail == '\0' || tail_allowed && **tail == ':') {
2307 return true;
2308 }
2309 }
2310 }
2311 return false;
2312 }
2313
2314 bool Arguments::parse_uintx(const char* value,
2315 uintx* uintx_arg,
2316 uintx min_size) {
2317
2318 // Check the sign first since atomull() parses only unsigned values.
2319 bool value_is_positive = !(*value == '-');
2320
2321 if (value_is_positive) {
2322 julong n;
2323 bool good_return = atomull(value, &n);
2324 if (good_return) {
2325 bool above_minimum = n >= min_size;
2326 bool value_is_too_large = n > max_uintx;
2327
2328 if (above_minimum && !value_is_too_large) {
2329 *uintx_arg = n;
2330 return true;
2331 }
2332 }
2333 }
2334 return false;
2335 }
2336
2337 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2338 julong* long_arg,
2339 julong min_size) {
2340 if (!atomull(s, long_arg)) return arg_unreadable;
2341 return check_memory_size(*long_arg, min_size);
2342 }
2343
2344 // Parse JavaVMInitArgs structure
2345
2346 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2347 // For components of the system classpath.
2348 SysClassPath scp(Arguments::get_sysclasspath());
2349 bool scp_assembly_required = false;
2350
2351 // Save default settings for some mode flags
2352 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2353 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2354 Arguments::_ClipInlining = ClipInlining;
2355 Arguments::_BackgroundCompilation = BackgroundCompilation;
2356
2357 // Setup flags for mixed which is the default
2358 set_mode_flags(_mixed);
2359
2360 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2361 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2362 if (result != JNI_OK) {
2363 return result;
2364 }
2365
2366 // Parse JavaVMInitArgs structure passed in
2367 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2368 if (result != JNI_OK) {
2369 return result;
2370 }
2371
2372 if (AggressiveOpts) {
2373 // Insert alt-rt.jar between user-specified bootclasspath
2374 // prefix and the default bootclasspath. os::set_boot_path()
2375 // uses meta_index_dir as the default bootclasspath directory.
2376 const char* altclasses_jar = "alt-rt.jar";
2377 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2378 strlen(altclasses_jar);
2379 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2380 strcpy(altclasses_path, get_meta_index_dir());
2381 strcat(altclasses_path, altclasses_jar);
2382 scp.add_suffix_to_prefix(altclasses_path);
2383 scp_assembly_required = true;
2384 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2385 }
2386
2387 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2388 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2389 if (result != JNI_OK) {
2390 return result;
2391 }
2392
2393 // Do final processing now that all arguments have been parsed
2394 result = finalize_vm_init_args(&scp, scp_assembly_required);
2395 if (result != JNI_OK) {
2396 return result;
2397 }
2398
2399 return JNI_OK;
2400 }
2401
2402 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2403 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2404 // are dealing with -agentpath (case where name is a path), otherwise with
2405 // -agentlib
2406 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2407 char *_name;
2408 const char *_hprof = "hprof", *_jdwp = "jdwp";
2409 size_t _len_hprof, _len_jdwp, _len_prefix;
2410
2411 if (is_path) {
2412 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2413 return false;
2414 }
2415
2416 _name++; // skip past last path separator
2417 _len_prefix = strlen(JNI_LIB_PREFIX);
2418
2419 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2420 return false;
2421 }
2422
2423 _name += _len_prefix;
2424 _len_hprof = strlen(_hprof);
2425 _len_jdwp = strlen(_jdwp);
2426
2427 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2428 _name += _len_hprof;
2429 }
2430 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2431 _name += _len_jdwp;
2432 }
2433 else {
2434 return false;
2435 }
2436
2437 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2438 return false;
2439 }
2440
2441 return true;
2442 }
2443
2444 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2445 return true;
2446 }
2447
2448 return false;
2449 }
2450
2451 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2452 SysClassPath* scp_p,
2453 bool* scp_assembly_required_p,
2454 FlagValueOrigin origin) {
2455 // Remaining part of option string
2456 const char* tail;
2457
2458 // iterate over arguments
2459 for (int index = 0; index < args->nOptions; index++) {
2460 bool is_absolute_path = false; // for -agentpath vs -agentlib
2461
2462 const JavaVMOption* option = args->options + index;
2463
2464 if (!match_option(option, "-Djava.class.path", &tail) &&
2465 !match_option(option, "-Dsun.java.command", &tail) &&
2466 !match_option(option, "-Dsun.java.launcher", &tail)) {
2467
2468 // add all jvm options to the jvm_args string. This string
2469 // is used later to set the java.vm.args PerfData string constant.
2470 // the -Djava.class.path and the -Dsun.java.command options are
2471 // omitted from jvm_args string as each have their own PerfData
2472 // string constant object.
2473 build_jvm_args(option->optionString);
2474 }
2475
2476 // -verbose:[class/gc/jni]
2477 if (match_option(option, "-verbose", &tail)) {
2478 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2479 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2480 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2481 } else if (!strcmp(tail, ":gc")) {
2482 FLAG_SET_CMDLINE(bool, PrintGC, true);
2483 } else if (!strcmp(tail, ":jni")) {
2484 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2485 }
2486 // -da / -ea / -disableassertions / -enableassertions
2487 // These accept an optional class/package name separated by a colon, e.g.,
2488 // -da:java.lang.Thread.
2489 } else if (match_option(option, user_assertion_options, &tail, true)) {
2490 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2491 if (*tail == '\0') {
2492 JavaAssertions::setUserClassDefault(enable);
2493 } else {
2494 assert(*tail == ':', "bogus match by match_option()");
2495 JavaAssertions::addOption(tail + 1, enable);
2496 }
2497 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2498 } else if (match_option(option, system_assertion_options, &tail, false)) {
2499 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2500 JavaAssertions::setSystemClassDefault(enable);
2501 // -bootclasspath:
2502 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2503 scp_p->reset_path(tail);
2504 *scp_assembly_required_p = true;
2505 // -bootclasspath/a:
2506 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2507 scp_p->add_suffix(tail);
2508 *scp_assembly_required_p = true;
2509 // -bootclasspath/p:
2510 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2511 scp_p->add_prefix(tail);
2512 *scp_assembly_required_p = true;
2513 // -Xrun
2514 } else if (match_option(option, "-Xrun", &tail)) {
2515 if (tail != NULL) {
2516 const char* pos = strchr(tail, ':');
2517 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2518 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2519 name[len] = '\0';
2520
2521 char *options = NULL;
2522 if(pos != NULL) {
2523 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2524 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2525 }
2526 #if !INCLUDE_JVMTI
2527 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2528 jio_fprintf(defaultStream::error_stream(),
2529 "Profiling and debugging agents are not supported in this VM\n");
2530 return JNI_ERR;
2531 }
2532 #endif // !INCLUDE_JVMTI
2533 add_init_library(name, options);
2534 }
2535 // -agentlib and -agentpath
2536 } else if (match_option(option, "-agentlib:", &tail) ||
2537 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2538 if(tail != NULL) {
2539 const char* pos = strchr(tail, '=');
2540 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2541 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2542 name[len] = '\0';
2543
2544 char *options = NULL;
2545 if(pos != NULL) {
2546 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2547 }
2548 #if !INCLUDE_JVMTI
2549 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2550 jio_fprintf(defaultStream::error_stream(),
2551 "Profiling and debugging agents are not supported in this VM\n");
2552 return JNI_ERR;
2553 }
2554 #endif // !INCLUDE_JVMTI
2555 add_init_agent(name, options, is_absolute_path);
2556 }
2557 // -javaagent
2558 } else if (match_option(option, "-javaagent:", &tail)) {
2559 #if !INCLUDE_JVMTI
2560 jio_fprintf(defaultStream::error_stream(),
2561 "Instrumentation agents are not supported in this VM\n");
2562 return JNI_ERR;
2563 #else
2564 if(tail != NULL) {
2565 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2566 add_init_agent("instrument", options, false);
2567 }
2568 #endif // !INCLUDE_JVMTI
2569 // -Xnoclassgc
2570 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2571 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2572 // -Xincgc: i-CMS
2573 } else if (match_option(option, "-Xincgc", &tail)) {
2574 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2575 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2576 // -Xnoincgc: no i-CMS
2577 } else if (match_option(option, "-Xnoincgc", &tail)) {
2578 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2579 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2580 // -Xconcgc
2581 } else if (match_option(option, "-Xconcgc", &tail)) {
2582 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2583 // -Xnoconcgc
2584 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2585 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2586 // -Xbatch
2587 } else if (match_option(option, "-Xbatch", &tail)) {
2588 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2589 // -Xmn for compatibility with other JVM vendors
2590 } else if (match_option(option, "-Xmn", &tail)) {
2591 julong long_initial_eden_size = 0;
2592 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2593 if (errcode != arg_in_range) {
2594 jio_fprintf(defaultStream::error_stream(),
2595 "Invalid initial eden size: %s\n", option->optionString);
2596 describe_range_error(errcode);
2597 return JNI_EINVAL;
2598 }
2599 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2600 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2601 // -Xms
2602 } else if (match_option(option, "-Xms", &tail)) {
2603 julong long_initial_heap_size = 0;
2604 // an initial heap size of 0 means automatically determine
2605 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2606 if (errcode != arg_in_range) {
2607 jio_fprintf(defaultStream::error_stream(),
2608 "Invalid initial heap size: %s\n", option->optionString);
2609 describe_range_error(errcode);
2610 return JNI_EINVAL;
2611 }
2612 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2613 // Currently the minimum size and the initial heap sizes are the same.
2614 set_min_heap_size(InitialHeapSize);
2615 // -Xmx
2616 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2617 julong long_max_heap_size = 0;
2618 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2619 if (errcode != arg_in_range) {
2620 jio_fprintf(defaultStream::error_stream(),
2621 "Invalid maximum heap size: %s\n", option->optionString);
2622 describe_range_error(errcode);
2623 return JNI_EINVAL;
2624 }
2625 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2626 // Xmaxf
2627 } else if (match_option(option, "-Xmaxf", &tail)) {
2628 int maxf = (int)(atof(tail) * 100);
2629 if (maxf < 0 || maxf > 100) {
2630 jio_fprintf(defaultStream::error_stream(),
2631 "Bad max heap free percentage size: %s\n",
2632 option->optionString);
2633 return JNI_EINVAL;
2634 } else {
2635 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2636 }
2637 // Xminf
2638 } else if (match_option(option, "-Xminf", &tail)) {
2639 int minf = (int)(atof(tail) * 100);
2640 if (minf < 0 || minf > 100) {
2641 jio_fprintf(defaultStream::error_stream(),
2642 "Bad min heap free percentage size: %s\n",
2643 option->optionString);
2644 return JNI_EINVAL;
2645 } else {
2646 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2647 }
2648 // -Xss
2649 } else if (match_option(option, "-Xss", &tail)) {
2650 julong long_ThreadStackSize = 0;
2651 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2652 if (errcode != arg_in_range) {
2653 jio_fprintf(defaultStream::error_stream(),
2654 "Invalid thread stack size: %s\n", option->optionString);
2655 describe_range_error(errcode);
2656 return JNI_EINVAL;
2657 }
2658 // Internally track ThreadStackSize in units of 1024 bytes.
2659 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2660 round_to((int)long_ThreadStackSize, K) / K);
2661 // -Xoss
2662 } else if (match_option(option, "-Xoss", &tail)) {
2663 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2664 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2665 julong long_CodeCacheExpansionSize = 0;
2666 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2667 if (errcode != arg_in_range) {
2668 jio_fprintf(defaultStream::error_stream(),
2669 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2670 os::vm_page_size()/K);
2671 return JNI_EINVAL;
2672 }
2673 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2674 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2675 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2676 julong long_ReservedCodeCacheSize = 0;
2677
2678 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2679 if (errcode != arg_in_range) {
2680 jio_fprintf(defaultStream::error_stream(),
2681 "Invalid maximum code cache size: %s.\n", option->optionString);
2682 return JNI_EINVAL;
2683 }
2684 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2685 #ifndef PRODUCT
2686 } else if(match_option(option, "-XX:PrintCodeCacheDetails=", &tail)) {
2687 CodeCache::init_printing_options(tail);
2688 #endif
2689 //-XX:IncreaseFirstTierCompileThresholdAt=
2690 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2691 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2692 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2693 jio_fprintf(defaultStream::error_stream(),
2694 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2695 option->optionString);
2696 return JNI_EINVAL;
2697 }
2698 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2699 // -green
2700 } else if (match_option(option, "-green", &tail)) {
2701 jio_fprintf(defaultStream::error_stream(),
2702 "Green threads support not available\n");
2703 return JNI_EINVAL;
2704 // -native
2705 } else if (match_option(option, "-native", &tail)) {
2706 // HotSpot always uses native threads, ignore silently for compatibility
2707 // -Xsqnopause
2708 } else if (match_option(option, "-Xsqnopause", &tail)) {
2709 // EVM option, ignore silently for compatibility
2710 // -Xrs
2711 } else if (match_option(option, "-Xrs", &tail)) {
2712 // Classic/EVM option, new functionality
2713 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2714 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2715 // change default internal VM signals used - lower case for back compat
2716 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2717 // -Xoptimize
2718 } else if (match_option(option, "-Xoptimize", &tail)) {
2719 // EVM option, ignore silently for compatibility
2720 // -Xprof
2721 } else if (match_option(option, "-Xprof", &tail)) {
2722 #if INCLUDE_FPROF
2723 _has_profile = true;
2724 #else // INCLUDE_FPROF
2725 jio_fprintf(defaultStream::error_stream(),
2726 "Flat profiling is not supported in this VM.\n");
2727 return JNI_ERR;
2728 #endif // INCLUDE_FPROF
2729 // -Xconcurrentio
2730 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2731 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2732 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2733 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2734 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2735 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2736
2737 // -Xinternalversion
2738 } else if (match_option(option, "-Xinternalversion", &tail)) {
2739 jio_fprintf(defaultStream::output_stream(), "%s\n",
2740 VM_Version::internal_vm_info_string());
2741 vm_exit(0);
2742 #ifndef PRODUCT
2743 // -Xprintflags
2744 } else if (match_option(option, "-Xprintflags", &tail)) {
2745 CommandLineFlags::printFlags(tty, false);
2746 vm_exit(0);
2747 #endif
2748 // -D
2749 } else if (match_option(option, "-D", &tail)) {
2750 if (!add_property(tail)) {
2751 return JNI_ENOMEM;
2752 }
2753 // Out of the box management support
2754 if (match_option(option, "-Dcom.sun.management", &tail)) {
2755 #if INCLUDE_MANAGEMENT
2756 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2757 #else
2758 jio_fprintf(defaultStream::output_stream(),
2759 "-Dcom.sun.management is not supported in this VM.\n");
2760 return JNI_ERR;
2761 #endif
2762 }
2763 // -Xint
2764 } else if (match_option(option, "-Xint", &tail)) {
2765 set_mode_flags(_int);
2766 // -Xmixed
2767 } else if (match_option(option, "-Xmixed", &tail)) {
2768 set_mode_flags(_mixed);
2769 // -Xcomp
2770 } else if (match_option(option, "-Xcomp", &tail)) {
2771 // for testing the compiler; turn off all flags that inhibit compilation
2772 set_mode_flags(_comp);
2773 // -Xshare:dump
2774 } else if (match_option(option, "-Xshare:dump", &tail)) {
2775 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2776 set_mode_flags(_int); // Prevent compilation, which creates objects
2777 // -Xshare:on
2778 } else if (match_option(option, "-Xshare:on", &tail)) {
2779 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2780 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2781 // -Xshare:auto
2782 } else if (match_option(option, "-Xshare:auto", &tail)) {
2783 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2784 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2785 // -Xshare:off
2786 } else if (match_option(option, "-Xshare:off", &tail)) {
2787 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2788 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2789 // -Xverify
2790 } else if (match_option(option, "-Xverify", &tail)) {
2791 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2792 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2793 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2794 } else if (strcmp(tail, ":remote") == 0) {
2795 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2796 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2797 } else if (strcmp(tail, ":none") == 0) {
2798 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2799 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2800 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2801 return JNI_EINVAL;
2802 }
2803 // -Xdebug
2804 } else if (match_option(option, "-Xdebug", &tail)) {
2805 // note this flag has been used, then ignore
2806 set_xdebug_mode(true);
2807 // -Xnoagent
2808 } else if (match_option(option, "-Xnoagent", &tail)) {
2809 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2810 } else if (match_option(option, "-Xboundthreads", &tail)) {
2811 // Bind user level threads to kernel threads (Solaris only)
2812 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2813 } else if (match_option(option, "-Xloggc:", &tail)) {
2814 // Redirect GC output to the file. -Xloggc:<filename>
2815 // ostream_init_log(), when called will use this filename
2816 // to initialize a fileStream.
2817 _gc_log_filename = strdup(tail);
2818 FLAG_SET_CMDLINE(bool, PrintGC, true);
2819 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2820
2821 // JNI hooks
2822 } else if (match_option(option, "-Xcheck", &tail)) {
2823 if (!strcmp(tail, ":jni")) {
2824 #if !INCLUDE_JNI_CHECK
2825 warning("JNI CHECKING is not supported in this VM");
2826 #else
2827 CheckJNICalls = true;
2828 #endif // INCLUDE_JNI_CHECK
2829 } else if (is_bad_option(option, args->ignoreUnrecognized,
2830 "check")) {
2831 return JNI_EINVAL;
2832 }
2833 } else if (match_option(option, "vfprintf", &tail)) {
2834 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2835 } else if (match_option(option, "exit", &tail)) {
2836 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2837 } else if (match_option(option, "abort", &tail)) {
2838 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2839 // -XX:+AggressiveHeap
2840 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2841
2842 // This option inspects the machine and attempts to set various
2843 // parameters to be optimal for long-running, memory allocation
2844 // intensive jobs. It is intended for machines with large
2845 // amounts of cpu and memory.
2846
2847 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2848 // VM, but we may not be able to represent the total physical memory
2849 // available (like having 8gb of memory on a box but using a 32bit VM).
2850 // Thus, we need to make sure we're using a julong for intermediate
2851 // calculations.
2852 julong initHeapSize;
2853 julong total_memory = os::physical_memory();
2854
2855 if (total_memory < (julong)256*M) {
2856 jio_fprintf(defaultStream::error_stream(),
2857 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2858 vm_exit(1);
2859 }
2860
2861 // The heap size is half of available memory, or (at most)
2862 // all of possible memory less 160mb (leaving room for the OS
2863 // when using ISM). This is the maximum; because adaptive sizing
2864 // is turned on below, the actual space used may be smaller.
2865
2866 initHeapSize = MIN2(total_memory / (julong)2,
2867 total_memory - (julong)160*M);
2868
2869 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2870
2871 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2872 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2873 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2874 // Currently the minimum size and the initial heap sizes are the same.
2875 set_min_heap_size(initHeapSize);
2876 }
2877 if (FLAG_IS_DEFAULT(NewSize)) {
2878 // Make the young generation 3/8ths of the total heap.
2879 FLAG_SET_CMDLINE(uintx, NewSize,
2880 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2881 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2882 }
2883
2884 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2885 FLAG_SET_DEFAULT(UseLargePages, true);
2886 #endif
2887
2888 // Increase some data structure sizes for efficiency
2889 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2890 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2891 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2892
2893 // See the OldPLABSize comment below, but replace 'after promotion'
2894 // with 'after copying'. YoungPLABSize is the size of the survivor
2895 // space per-gc-thread buffers. The default is 4kw.
2896 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2897
2898 // OldPLABSize is the size of the buffers in the old gen that
2899 // UseParallelGC uses to promote live data that doesn't fit in the
2900 // survivor spaces. At any given time, there's one for each gc thread.
2901 // The default size is 1kw. These buffers are rarely used, since the
2902 // survivor spaces are usually big enough. For specjbb, however, there
2903 // are occasions when there's lots of live data in the young gen
2904 // and we end up promoting some of it. We don't have a definite
2905 // explanation for why bumping OldPLABSize helps, but the theory
2906 // is that a bigger PLAB results in retaining something like the
2907 // original allocation order after promotion, which improves mutator
2908 // locality. A minor effect may be that larger PLABs reduce the
2909 // number of PLAB allocation events during gc. The value of 8kw
2910 // was arrived at by experimenting with specjbb.
2911 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2912
2913 // Enable parallel GC and adaptive generation sizing
2914 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2915 FLAG_SET_DEFAULT(ParallelGCThreads,
2916 Abstract_VM_Version::parallel_worker_threads());
2917
2918 // Encourage steady state memory management
2919 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2920
2921 // This appears to improve mutator locality
2922 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2923
2924 // Get around early Solaris scheduling bug
2925 // (affinity vs other jobs on system)
2926 // but disallow DR and offlining (5008695).
2927 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2928
2929 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2930 // The last option must always win.
2931 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2932 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2933 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2934 // The last option must always win.
2935 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2936 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2937 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2938 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2939 jio_fprintf(defaultStream::error_stream(),
2940 "Please use CMSClassUnloadingEnabled in place of "
2941 "CMSPermGenSweepingEnabled in the future\n");
2942 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2943 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2944 jio_fprintf(defaultStream::error_stream(),
2945 "Please use -XX:+UseGCOverheadLimit in place of "
2946 "-XX:+UseGCTimeLimit in the future\n");
2947 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2948 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2949 jio_fprintf(defaultStream::error_stream(),
2950 "Please use -XX:-UseGCOverheadLimit in place of "
2951 "-XX:-UseGCTimeLimit in the future\n");
2952 // The TLE options are for compatibility with 1.3 and will be
2953 // removed without notice in a future release. These options
2954 // are not to be documented.
2955 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2956 // No longer used.
2957 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2958 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2959 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2960 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2961 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2962 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2963 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2964 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2965 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2966 // No longer used.
2967 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2968 julong long_tlab_size = 0;
2969 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2970 if (errcode != arg_in_range) {
2971 jio_fprintf(defaultStream::error_stream(),
2972 "Invalid TLAB size: %s\n", option->optionString);
2973 describe_range_error(errcode);
2974 return JNI_EINVAL;
2975 }
2976 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2977 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2978 // No longer used.
2979 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2980 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2981 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2982 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2983 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2984 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2985 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2986 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2987 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2988 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2989 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2990 #if defined(DTRACE_ENABLED)
2991 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2992 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2993 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2994 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2995 #else // defined(DTRACE_ENABLED)
2996 jio_fprintf(defaultStream::error_stream(),
2997 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2998 return JNI_EINVAL;
2999 #endif // defined(DTRACE_ENABLED)
3000 #ifdef ASSERT
3001 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3002 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3003 // disable scavenge before parallel mark-compact
3004 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3005 #endif
3006 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3007 julong cms_blocks_to_claim = (julong)atol(tail);
3008 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3009 jio_fprintf(defaultStream::error_stream(),
3010 "Please use -XX:OldPLABSize in place of "
3011 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3012 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3013 julong cms_blocks_to_claim = (julong)atol(tail);
3014 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3015 jio_fprintf(defaultStream::error_stream(),
3016 "Please use -XX:OldPLABSize in place of "
3017 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3018 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3019 julong old_plab_size = 0;
3020 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3021 if (errcode != arg_in_range) {
3022 jio_fprintf(defaultStream::error_stream(),
3023 "Invalid old PLAB size: %s\n", option->optionString);
3024 describe_range_error(errcode);
3025 return JNI_EINVAL;
3026 }
3027 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3028 jio_fprintf(defaultStream::error_stream(),
3029 "Please use -XX:OldPLABSize in place of "
3030 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3031 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3032 julong young_plab_size = 0;
3033 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3034 if (errcode != arg_in_range) {
3035 jio_fprintf(defaultStream::error_stream(),
3036 "Invalid young PLAB size: %s\n", option->optionString);
3037 describe_range_error(errcode);
3038 return JNI_EINVAL;
3039 }
3040 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3041 jio_fprintf(defaultStream::error_stream(),
3042 "Please use -XX:YoungPLABSize in place of "
3043 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3044 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3045 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3046 julong stack_size = 0;
3047 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3048 if (errcode != arg_in_range) {
3049 jio_fprintf(defaultStream::error_stream(),
3050 "Invalid mark stack size: %s\n", option->optionString);
3051 describe_range_error(errcode);
3052 return JNI_EINVAL;
3053 }
3054 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3055 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3056 julong max_stack_size = 0;
3057 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3058 if (errcode != arg_in_range) {
3059 jio_fprintf(defaultStream::error_stream(),
3060 "Invalid maximum mark stack size: %s\n",
3061 option->optionString);
3062 describe_range_error(errcode);
3063 return JNI_EINVAL;
3064 }
3065 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3066 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3067 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3068 uintx conc_threads = 0;
3069 if (!parse_uintx(tail, &conc_threads, 1)) {
3070 jio_fprintf(defaultStream::error_stream(),
3071 "Invalid concurrent threads: %s\n", option->optionString);
3072 return JNI_EINVAL;
3073 }
3074 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3075 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3076 julong max_direct_memory_size = 0;
3077 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3078 if (errcode != arg_in_range) {
3079 jio_fprintf(defaultStream::error_stream(),
3080 "Invalid maximum direct memory size: %s\n",
3081 option->optionString);
3082 describe_range_error(errcode);
3083 return JNI_EINVAL;
3084 }
3085 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3086 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3087 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3088 // away and will cause VM initialization failures!
3089 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3090 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3091 #if !INCLUDE_MANAGEMENT
3092 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3093 jio_fprintf(defaultStream::error_stream(),
3094 "ManagementServer is not supported in this VM.\n");
3095 return JNI_ERR;
3096 #endif // INCLUDE_MANAGEMENT
3097 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3098 // Skip -XX:Flags= since that case has already been handled
3099 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3100 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3101 return JNI_EINVAL;
3102 }
3103 }
3104 // Unknown option
3105 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3106 return JNI_ERR;
3107 }
3108 }
3109
3110 // Change the default value for flags which have different default values
3111 // when working with older JDKs.
3112 #ifdef LINUX
3113 if (JDK_Version::current().compare_major(6) <= 0 &&
3114 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3115 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3116 }
3117 #endif // LINUX
3118 return JNI_OK;
3119 }
3120
3121 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3122 // This must be done after all -D arguments have been processed.
3123 scp_p->expand_endorsed();
3124
3125 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3126 // Assemble the bootclasspath elements into the final path.
3127 Arguments::set_sysclasspath(scp_p->combined_path());
3128 }
3129
3130 // This must be done after all arguments have been processed.
3131 // java_compiler() true means set to "NONE" or empty.
3132 if (java_compiler() && !xdebug_mode()) {
3133 // For backwards compatibility, we switch to interpreted mode if
3134 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3135 // not specified.
3136 set_mode_flags(_int);
3137 }
3138 if (CompileThreshold == 0) {
3139 set_mode_flags(_int);
3140 }
3141
3142 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3143 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3144 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3145 }
3146
3147 #ifndef COMPILER2
3148 // Don't degrade server performance for footprint
3149 if (FLAG_IS_DEFAULT(UseLargePages) &&
3150 MaxHeapSize < LargePageHeapSizeThreshold) {
3151 // No need for large granularity pages w/small heaps.
3152 // Note that large pages are enabled/disabled for both the
3153 // Java heap and the code cache.
3154 FLAG_SET_DEFAULT(UseLargePages, false);
3155 }
3156
3157 #else
3158 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3159 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3160 }
3161 #endif
3162
3163 #ifndef TIERED
3164 // Tiered compilation is undefined.
3165 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3166 #endif
3167
3168 // If we are running in a headless jre, force java.awt.headless property
3169 // to be true unless the property has already been set.
3170 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3171 if (os::is_headless_jre()) {
3172 const char* headless = Arguments::get_property("java.awt.headless");
3173 if (headless == NULL) {
3174 char envbuffer[128];
3175 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3176 if (!add_property("java.awt.headless=true")) {
3177 return JNI_ENOMEM;
3178 }
3179 } else {
3180 char buffer[256];
3181 strcpy(buffer, "java.awt.headless=");
3182 strcat(buffer, envbuffer);
3183 if (!add_property(buffer)) {
3184 return JNI_ENOMEM;
3185 }
3186 }
3187 }
3188 }
3189
3190 if (!check_vm_args_consistency()) {
3191 return JNI_ERR;
3192 }
3193
3194 return JNI_OK;
3195 }
3196
3197 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3198 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3199 scp_assembly_required_p);
3200 }
3201
3202 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3203 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3204 scp_assembly_required_p);
3205 }
3206
3207 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3208 const int N_MAX_OPTIONS = 64;
3209 const int OPTION_BUFFER_SIZE = 1024;
3210 char buffer[OPTION_BUFFER_SIZE];
3211
3212 // The variable will be ignored if it exceeds the length of the buffer.
3213 // Don't check this variable if user has special privileges
3214 // (e.g. unix su command).
3215 if (os::getenv(name, buffer, sizeof(buffer)) &&
3216 !os::have_special_privileges()) {
3217 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3218 jio_fprintf(defaultStream::error_stream(),
3219 "Picked up %s: %s\n", name, buffer);
3220 char* rd = buffer; // pointer to the input string (rd)
3221 int i;
3222 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3223 while (isspace(*rd)) rd++; // skip whitespace
3224 if (*rd == 0) break; // we re done when the input string is read completely
3225
3226 // The output, option string, overwrites the input string.
3227 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3228 // input string (rd).
3229 char* wrt = rd;
3230
3231 options[i++].optionString = wrt; // Fill in option
3232 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3233 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3234 int quote = *rd; // matching quote to look for
3235 rd++; // don't copy open quote
3236 while (*rd != quote) { // include everything (even spaces) up until quote
3237 if (*rd == 0) { // string termination means unmatched string
3238 jio_fprintf(defaultStream::error_stream(),
3239 "Unmatched quote in %s\n", name);
3240 return JNI_ERR;
3241 }
3242 *wrt++ = *rd++; // copy to option string
3243 }
3244 rd++; // don't copy close quote
3245 } else {
3246 *wrt++ = *rd++; // copy to option string
3247 }
3248 }
3249 // Need to check if we're done before writing a NULL,
3250 // because the write could be to the byte that rd is pointing to.
3251 if (*rd++ == 0) {
3252 *wrt = 0;
3253 break;
3254 }
3255 *wrt = 0; // Zero terminate option
3256 }
3257 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3258 JavaVMInitArgs vm_args;
3259 vm_args.version = JNI_VERSION_1_2;
3260 vm_args.options = options;
3261 vm_args.nOptions = i;
3262 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3263
3264 if (PrintVMOptions) {
3265 const char* tail;
3266 for (int i = 0; i < vm_args.nOptions; i++) {
3267 const JavaVMOption *option = vm_args.options + i;
3268 if (match_option(option, "-XX:", &tail)) {
3269 logOption(tail);
3270 }
3271 }
3272 }
3273
3274 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
3275 }
3276 return JNI_OK;
3277 }
3278
3279 void Arguments::set_shared_spaces_flags() {
3280 #ifdef _LP64
3281 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
3282
3283 // CompressedOops cannot be used with CDS. The offsets of oopmaps and
3284 // static fields are incorrect in the archive. With some more clever
3285 // initialization, this restriction can probably be lifted.
3286 if (UseCompressedOops) {
3287 if (must_share) {
3288 warning("disabling compressed oops because of %s",
3289 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
3290 FLAG_SET_CMDLINE(bool, UseCompressedOops, false);
3291 FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false);
3292 } else {
3293 // Prefer compressed oops to class data sharing
3294 if (UseSharedSpaces && Verbose) {
3295 warning("turning off use of shared archive because of compressed oops");
3296 }
3297 no_shared_spaces();
3298 }
3299 }
3300 #endif
3301
3302 if (DumpSharedSpaces) {
3303 if (RequireSharedSpaces) {
3304 warning("cannot dump shared archive while using shared archive");
3305 }
3306 UseSharedSpaces = false;
3307 }
3308 }
3309
3310 #if !INCLUDE_ALL_GCS
3311 static void force_serial_gc() {
3312 FLAG_SET_DEFAULT(UseSerialGC, true);
3313 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3314 UNSUPPORTED_GC_OPTION(UseG1GC);
3315 UNSUPPORTED_GC_OPTION(UseParallelGC);
3316 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3317 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3318 UNSUPPORTED_GC_OPTION(UseParNewGC);
3319 }
3320 #endif // INCLUDE_ALL_GCS
3321
3322 // Sharing support
3323 // Construct the path to the archive
3324 static char* get_shared_archive_path() {
3325 char *shared_archive_path;
3326 if (SharedArchiveFile == NULL) {
3327 char jvm_path[JVM_MAXPATHLEN];
3328 os::jvm_path(jvm_path, sizeof(jvm_path));
3329 char *end = strrchr(jvm_path, *os::file_separator());
3330 if (end != NULL) *end = '\0';
3331 size_t jvm_path_len = strlen(jvm_path);
3332 size_t file_sep_len = strlen(os::file_separator());
3333 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3334 file_sep_len + 20, mtInternal);
3335 if (shared_archive_path != NULL) {
3336 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3337 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3338 strncat(shared_archive_path, "classes.jsa", 11);
3339 }
3340 } else {
3341 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3342 if (shared_archive_path != NULL) {
3343 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3344 }
3345 }
3346 return shared_archive_path;
3347 }
3348
3349 // Parse entry point called from JNI_CreateJavaVM
3350
3351 jint Arguments::parse(const JavaVMInitArgs* args) {
3352
3353 // Remaining part of option string
3354 const char* tail;
3355
3356 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3357 const char* hotspotrc = ".hotspotrc";
3358 bool settings_file_specified = false;
3359 bool needs_hotspotrc_warning = false;
3360
3361 const char* flags_file;
3362 int index;
3363 for (index = 0; index < args->nOptions; index++) {
3364 const JavaVMOption *option = args->options + index;
3365 if (match_option(option, "-XX:Flags=", &tail)) {
3366 flags_file = tail;
3367 settings_file_specified = true;
3368 }
3369 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3370 PrintVMOptions = true;
3371 }
3372 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3373 PrintVMOptions = false;
3374 }
3375 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3376 IgnoreUnrecognizedVMOptions = true;
3377 }
3378 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3379 IgnoreUnrecognizedVMOptions = false;
3380 }
3381 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3382 CommandLineFlags::printFlags(tty, false);
3383 vm_exit(0);
3384 }
3385 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3386 #if INCLUDE_NMT
3387 MemTracker::init_tracking_options(tail);
3388 #else
3389 jio_fprintf(defaultStream::error_stream(),
3390 "Native Memory Tracking is not supported in this VM\n");
3391 return JNI_ERR;
3392 #endif
3393 }
3394
3395
3396 #ifndef PRODUCT
3397 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3398 CommandLineFlags::printFlags(tty, true);
3399 vm_exit(0);
3400 }
3401 #endif
3402 }
3403
3404 if (IgnoreUnrecognizedVMOptions) {
3405 // uncast const to modify the flag args->ignoreUnrecognized
3406 *(jboolean*)(&args->ignoreUnrecognized) = true;
3407 }
3408
3409 // Parse specified settings file
3410 if (settings_file_specified) {
3411 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3412 return JNI_EINVAL;
3413 }
3414 } else {
3415 #ifdef ASSERT
3416 // Parse default .hotspotrc settings file
3417 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3418 return JNI_EINVAL;
3419 }
3420 #else
3421 struct stat buf;
3422 if (os::stat(hotspotrc, &buf) == 0) {
3423 needs_hotspotrc_warning = true;
3424 }
3425 #endif
3426 }
3427
3428 if (PrintVMOptions) {
3429 for (index = 0; index < args->nOptions; index++) {
3430 const JavaVMOption *option = args->options + index;
3431 if (match_option(option, "-XX:", &tail)) {
3432 logOption(tail);
3433 }
3434 }
3435 }
3436
3437 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3438 jint result = parse_vm_init_args(args);
3439 if (result != JNI_OK) {
3440 return result;
3441 }
3442
3443 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3444 SharedArchivePath = get_shared_archive_path();
3445 if (SharedArchivePath == NULL) {
3446 return JNI_ENOMEM;
3447 }
3448
3449 // Delay warning until here so that we've had a chance to process
3450 // the -XX:-PrintWarnings flag
3451 if (needs_hotspotrc_warning) {
3452 warning("%s file is present but has been ignored. "
3453 "Run with -XX:Flags=%s to load the file.",
3454 hotspotrc, hotspotrc);
3455 }
3456
3457 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3458 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3459 #endif
3460
3461 #if INCLUDE_ALL_GCS
3462 #if (defined JAVASE_EMBEDDED || defined ARM)
3463 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3464 #endif
3465 #endif
3466
3467 #ifndef PRODUCT
3468 if (TraceBytecodesAt != 0) {
3469 TraceBytecodes = true;
3470 }
3471 if (CountCompiledCalls) {
3472 if (UseCounterDecay) {
3473 warning("UseCounterDecay disabled because CountCalls is set");
3474 UseCounterDecay = false;
3475 }
3476 }
3477 #endif // PRODUCT
3478
3479 // JSR 292 is not supported before 1.7
3480 if (!JDK_Version::is_gte_jdk17x_version()) {
3481 if (EnableInvokeDynamic) {
3482 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3483 warning("JSR 292 is not supported before 1.7. Disabling support.");
3484 }
3485 EnableInvokeDynamic = false;
3486 }
3487 }
3488
3489 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3490 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3491 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3492 }
3493 ScavengeRootsInCode = 1;
3494 }
3495
3496 if (PrintGCDetails) {
3497 // Turn on -verbose:gc options as well
3498 PrintGC = true;
3499 }
3500
3501 if (!JDK_Version::is_gte_jdk18x_version()) {
3502 // To avoid changing the log format for 7 updates this flag is only
3503 // true by default in JDK8 and above.
3504 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3505 FLAG_SET_DEFAULT(PrintGCCause, false);
3506 }
3507 }
3508
3509 // Set object alignment values.
3510 set_object_alignment();
3511
3512 #if !INCLUDE_ALL_GCS
3513 force_serial_gc();
3514 #endif // INCLUDE_ALL_GCS
3515 #if !INCLUDE_CDS
3516 if (DumpSharedSpaces || RequireSharedSpaces) {
3517 jio_fprintf(defaultStream::error_stream(),
3518 "Shared spaces are not supported in this VM\n");
3519 return JNI_ERR;
3520 }
3521 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3522 warning("Shared spaces are not supported in this VM");
3523 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3524 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3525 }
3526 no_shared_spaces();
3527 #endif // INCLUDE_CDS
3528
3529 // Set flags based on ergonomics.
3530 set_ergonomics_flags();
3531
3532 set_shared_spaces_flags();
3533
3534 // Check the GC selections again.
3535 if (!check_gc_consistency()) {
3536 return JNI_EINVAL;
3537 }
3538
3539 if (TieredCompilation) {
3540 set_tiered_flags();
3541 } else {
3542 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3543 if (CompilationPolicyChoice >= 2) {
3544 vm_exit_during_initialization(
3545 "Incompatible compilation policy selected", NULL);
3546 }
3547 }
3548
3549 set_heap_base_min_address();
3550
3551 // Set heap size based on available physical memory
3552 set_heap_size();
3553
3554 #if INCLUDE_ALL_GCS
3555 // Set per-collector flags
3556 if (UseParallelGC || UseParallelOldGC) {
3557 set_parallel_gc_flags();
3558 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3559 set_cms_and_parnew_gc_flags();
3560 } else if (UseParNewGC) { // skipped if CMS is set above
3561 set_parnew_gc_flags();
3562 } else if (UseG1GC) {
3563 set_g1_gc_flags();
3564 }
3565 check_deprecated_gcs();
3566 check_deprecated_gc_flags();
3567 if (AssumeMP && !UseSerialGC) {
3568 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3569 warning("If the number of processors is expected to increase from one, then"
3570 " you should configure the number of parallel GC threads appropriately"
3571 " using -XX:ParallelGCThreads=N");
3572 }
3573 }
3574 #else // INCLUDE_ALL_GCS
3575 assert(verify_serial_gc_flags(), "SerialGC unset");
3576 #endif // INCLUDE_ALL_GCS
3577
3578 // Set bytecode rewriting flags
3579 set_bytecode_flags();
3580
3581 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3582 set_aggressive_opts_flags();
3583
3584 // Turn off biased locking for locking debug mode flags,
3585 // which are subtlely different from each other but neither works with
3586 // biased locking.
3587 if (UseHeavyMonitors
3588 #ifdef COMPILER1
3589 || !UseFastLocking
3590 #endif // COMPILER1
3591 ) {
3592 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3593 // flag set to true on command line; warn the user that they
3594 // can't enable biased locking here
3595 warning("Biased Locking is not supported with locking debug flags"
3596 "; ignoring UseBiasedLocking flag." );
3597 }
3598 UseBiasedLocking = false;
3599 }
3600
3601 #ifdef CC_INTERP
3602 // Clear flags not supported by the C++ interpreter
3603 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3604 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3605 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3606 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
3607 #endif // CC_INTERP
3608
3609 #ifdef COMPILER2
3610 if (!UseBiasedLocking || EmitSync != 0) {
3611 UseOptoBiasInlining = false;
3612 }
3613 if (!EliminateLocks) {
3614 EliminateNestedLocks = false;
3615 }
3616 if (!Inline) {
3617 IncrementalInline = false;
3618 }
3619 #ifndef PRODUCT
3620 if (!IncrementalInline) {
3621 AlwaysIncrementalInline = false;
3622 }
3623 #endif
3624 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3625 // incremental inlining: bump MaxNodeLimit
3626 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3627 }
3628 #endif
3629
3630 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3631 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3632 DebugNonSafepoints = true;
3633 }
3634
3635 #ifndef PRODUCT
3636 if (CompileTheWorld) {
3637 // Force NmethodSweeper to sweep whole CodeCache each time.
3638 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3639 NmethodSweepFraction = 1;
3640 }
3641 }
3642 #endif
3643
3644 if (PrintCommandLineFlags) {
3645 CommandLineFlags::printSetFlags(tty);
3646 }
3647
3648 // Apply CPU specific policy for the BiasedLocking
3649 if (UseBiasedLocking) {
3650 if (!VM_Version::use_biased_locking() &&
3651 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3652 UseBiasedLocking = false;
3653 }
3654 }
3655
3656 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3657 // but only if not already set on the commandline
3658 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3659 bool set = false;
3660 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3661 if (!set) {
3662 FLAG_SET_DEFAULT(PauseAtExit, true);
3663 }
3664 }
3665
3666 return JNI_OK;
3667 }
3668
3669 jint Arguments::adjust_after_os() {
3670 #if INCLUDE_ALL_GCS
3671 if (UseParallelGC || UseParallelOldGC) {
3672 if (UseNUMA) {
3673 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3674 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3675 }
3676 // For those collectors or operating systems (eg, Windows) that do
3677 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3678 UseNUMAInterleaving = true;
3679 }
3680 }
3681 #endif // INCLUDE_ALL_GCS
3682 return JNI_OK;
3683 }
3684
3685 int Arguments::PropertyList_count(SystemProperty* pl) {
3686 int count = 0;
3687 while(pl != NULL) {
3688 count++;
3689 pl = pl->next();
3690 }
3691 return count;
3692 }
3693
3694 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3695 assert(key != NULL, "just checking");
3696 SystemProperty* prop;
3697 for (prop = pl; prop != NULL; prop = prop->next()) {
3698 if (strcmp(key, prop->key()) == 0) return prop->value();
3699 }
3700 return NULL;
3701 }
3702
3703 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3704 int count = 0;
3705 const char* ret_val = NULL;
3706
3707 while(pl != NULL) {
3708 if(count >= index) {
3709 ret_val = pl->key();
3710 break;
3711 }
3712 count++;
3713 pl = pl->next();
3714 }
3715
3716 return ret_val;
3717 }
3718
3719 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3720 int count = 0;
3721 char* ret_val = NULL;
3722
3723 while(pl != NULL) {
3724 if(count >= index) {
3725 ret_val = pl->value();
3726 break;
3727 }
3728 count++;
3729 pl = pl->next();
3730 }
3731
3732 return ret_val;
3733 }
3734
3735 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3736 SystemProperty* p = *plist;
3737 if (p == NULL) {
3738 *plist = new_p;
3739 } else {
3740 while (p->next() != NULL) {
3741 p = p->next();
3742 }
3743 p->set_next(new_p);
3744 }
3745 }
3746
3747 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3748 if (plist == NULL)
3749 return;
3750
3751 SystemProperty* new_p = new SystemProperty(k, v, true);
3752 PropertyList_add(plist, new_p);
3753 }
3754
3755 // This add maintains unique property key in the list.
3756 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3757 if (plist == NULL)
3758 return;
3759
3760 // If property key exist then update with new value.
3761 SystemProperty* prop;
3762 for (prop = *plist; prop != NULL; prop = prop->next()) {
3763 if (strcmp(k, prop->key()) == 0) {
3764 if (append) {
3765 prop->append_value(v);
3766 } else {
3767 prop->set_value(v);
3768 }
3769 return;
3770 }
3771 }
3772
3773 PropertyList_add(plist, k, v);
3774 }
3775
3776 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3777 // Returns true if all of the source pointed by src has been copied over to
3778 // the destination buffer pointed by buf. Otherwise, returns false.
3779 // Notes:
3780 // 1. If the length (buflen) of the destination buffer excluding the
3781 // NULL terminator character is not long enough for holding the expanded
3782 // pid characters, it also returns false instead of returning the partially
3783 // expanded one.
3784 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3785 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3786 char* buf, size_t buflen) {
3787 const char* p = src;
3788 char* b = buf;
3789 const char* src_end = &src[srclen];
3790 char* buf_end = &buf[buflen - 1];
3791
3792 while (p < src_end && b < buf_end) {
3793 if (*p == '%') {
3794 switch (*(++p)) {
3795 case '%': // "%%" ==> "%"
3796 *b++ = *p++;
3797 break;
3798 case 'p': { // "%p" ==> current process id
3799 // buf_end points to the character before the last character so
3800 // that we could write '\0' to the end of the buffer.
3801 size_t buf_sz = buf_end - b + 1;
3802 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3803
3804 // if jio_snprintf fails or the buffer is not long enough to hold
3805 // the expanded pid, returns false.
3806 if (ret < 0 || ret >= (int)buf_sz) {
3807 return false;
3808 } else {
3809 b += ret;
3810 assert(*b == '\0', "fail in copy_expand_pid");
3811 if (p == src_end && b == buf_end + 1) {
3812 // reach the end of the buffer.
3813 return true;
3814 }
3815 }
3816 p++;
3817 break;
3818 }
3819 default :
3820 *b++ = '%';
3821 }
3822 } else {
3823 *b++ = *p++;
3824 }
3825 }
3826 *b = '\0';
3827 return (p == src_end); // return false if not all of the source was copied
3828 }