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/genCollectedHeap.hpp"
32 #include "memory/referenceProcessor.hpp"
33 #include "memory/universe.inline.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "prims/jvmtiExport.hpp"
36 #include "runtime/arguments.hpp"
37 #include "runtime/globals_extension.hpp"
38 #include "runtime/java.hpp"
39 #include "services/management.hpp"
40 #include "services/memTracker.hpp"
41 #include "utilities/defaultStream.hpp"
42 #include "utilities/macros.hpp"
43 #include "utilities/taskqueue.hpp"
44 #ifdef TARGET_OS_FAMILY_linux
45 # include "os_linux.inline.hpp"
46 #endif
47 #ifdef TARGET_OS_FAMILY_solaris
48 # include "os_solaris.inline.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_windows
51 # include "os_windows.inline.hpp"
52 #endif
53 #ifdef TARGET_OS_FAMILY_bsd
54 # include "os_bsd.inline.hpp"
55 #endif
56 #if INCLUDE_ALL_GCS
57 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
58 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
59 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
60 #endif // INCLUDE_ALL_GCS
61
62 // Note: This is a special bug reporting site for the JVM
63 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
64 #define DEFAULT_JAVA_LAUNCHER "generic"
65
66 // Disable options not supported in this release, with a warning if they
67 // were explicitly requested on the command-line
68 #define UNSUPPORTED_OPTION(opt, description) \
69 do { \
70 if (opt) { \
71 if (FLAG_IS_CMDLINE(opt)) { \
72 warning(description " is disabled in this release."); \
73 } \
74 FLAG_SET_DEFAULT(opt, false); \
75 } \
76 } while(0)
77
78 #define UNSUPPORTED_GC_OPTION(gc) \
79 do { \
80 if (gc) { \
81 if (FLAG_IS_CMDLINE(gc)) { \
82 warning(#gc " is not supported in this VM. Using Serial GC."); \
83 } \
84 FLAG_SET_DEFAULT(gc, false); \
85 } \
86 } while(0)
87
88 char** Arguments::_jvm_flags_array = NULL;
89 int Arguments::_num_jvm_flags = 0;
90 char** Arguments::_jvm_args_array = NULL;
91 int Arguments::_num_jvm_args = 0;
92 char* Arguments::_java_command = NULL;
93 SystemProperty* Arguments::_system_properties = NULL;
94 const char* Arguments::_gc_log_filename = NULL;
95 bool Arguments::_has_profile = false;
96 size_t Arguments::_conservative_max_heap_alignment = 0;
97 uintx Arguments::_min_heap_size = 0;
98 Arguments::Mode Arguments::_mode = _mixed;
99 bool Arguments::_java_compiler = false;
100 bool Arguments::_xdebug_mode = false;
101 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
102 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
103 int Arguments::_sun_java_launcher_pid = -1;
104 bool Arguments::_created_by_gamma_launcher = false;
105
106 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
107 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
108 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
109 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
110 bool Arguments::_ClipInlining = ClipInlining;
111
112 char* Arguments::SharedArchivePath = NULL;
113
114 AgentLibraryList Arguments::_libraryList;
115 AgentLibraryList Arguments::_agentList;
116
117 abort_hook_t Arguments::_abort_hook = NULL;
118 exit_hook_t Arguments::_exit_hook = NULL;
119 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
120
121
122 SystemProperty *Arguments::_java_ext_dirs = NULL;
123 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
124 SystemProperty *Arguments::_sun_boot_library_path = NULL;
125 SystemProperty *Arguments::_java_library_path = NULL;
126 SystemProperty *Arguments::_java_home = NULL;
127 SystemProperty *Arguments::_java_class_path = NULL;
128 SystemProperty *Arguments::_sun_boot_class_path = NULL;
129
130 char* Arguments::_meta_index_path = NULL;
131 char* Arguments::_meta_index_dir = NULL;
132
133 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
134
135 static bool match_option(const JavaVMOption *option, const char* name,
136 const char** tail) {
137 int len = (int)strlen(name);
138 if (strncmp(option->optionString, name, len) == 0) {
139 *tail = option->optionString + len;
140 return true;
141 } else {
142 return false;
143 }
144 }
145
146 static void logOption(const char* opt) {
147 if (PrintVMOptions) {
148 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
149 }
150 }
151
152 // Process java launcher properties.
153 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
154 // See if sun.java.launcher or sun.java.launcher.pid is defined.
155 // Must do this before setting up other system properties,
156 // as some of them may depend on launcher type.
157 for (int index = 0; index < args->nOptions; index++) {
158 const JavaVMOption* option = args->options + index;
159 const char* tail;
160
161 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
162 process_java_launcher_argument(tail, option->extraInfo);
163 continue;
164 }
165 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
166 _sun_java_launcher_pid = atoi(tail);
167 continue;
168 }
169 }
170 }
171
172 // Initialize system properties key and value.
173 void Arguments::init_system_properties() {
174
175 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
176 "Java Virtual Machine Specification", false));
177 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
178 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
179 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
180
181 // following are JVMTI agent writeable properties.
182 // Properties values are set to NULL and they are
183 // os specific they are initialized in os::init_system_properties_values().
184 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
185 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
186 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
187 _java_library_path = new SystemProperty("java.library.path", NULL, true);
188 _java_home = new SystemProperty("java.home", NULL, true);
189 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
190
191 _java_class_path = new SystemProperty("java.class.path", "", true);
192
193 // Add to System Property list.
194 PropertyList_add(&_system_properties, _java_ext_dirs);
195 PropertyList_add(&_system_properties, _java_endorsed_dirs);
196 PropertyList_add(&_system_properties, _sun_boot_library_path);
197 PropertyList_add(&_system_properties, _java_library_path);
198 PropertyList_add(&_system_properties, _java_home);
199 PropertyList_add(&_system_properties, _java_class_path);
200 PropertyList_add(&_system_properties, _sun_boot_class_path);
201
202 // Set OS specific system properties values
203 os::init_system_properties_values();
204 }
205
206
207 // Update/Initialize System properties after JDK version number is known
208 void Arguments::init_version_specific_system_properties() {
209 enum { bufsz = 16 };
210 char buffer[bufsz];
211 const char* spec_vendor = "Sun Microsystems Inc.";
212 uint32_t spec_version = 0;
213
214 if (JDK_Version::is_gte_jdk17x_version()) {
215 spec_vendor = "Oracle Corporation";
216 spec_version = JDK_Version::current().major_version();
217 }
218 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
219
220 PropertyList_add(&_system_properties,
221 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
222 PropertyList_add(&_system_properties,
223 new SystemProperty("java.vm.specification.version", buffer, false));
224 PropertyList_add(&_system_properties,
225 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
226 }
227
228 /**
229 * Provide a slightly more user-friendly way of eliminating -XX flags.
230 * When a flag is eliminated, it can be added to this list in order to
231 * continue accepting this flag on the command-line, while issuing a warning
232 * and ignoring the value. Once the JDK version reaches the 'accept_until'
233 * limit, we flatly refuse to admit the existence of the flag. This allows
234 * a flag to die correctly over JDK releases using HSX.
235 */
236 typedef struct {
237 const char* name;
238 JDK_Version obsoleted_in; // when the flag went away
239 JDK_Version accept_until; // which version to start denying the existence
240 } ObsoleteFlag;
241
242 static ObsoleteFlag obsolete_jvm_flags[] = {
243 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
244 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
245 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
246 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
247 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
248 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
249 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
250 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
251 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
252 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
253 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
257 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
258 { "DefaultInitialRAMFraction",
259 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
260 { "UseDepthFirstScavengeOrder",
261 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
262 { "HandlePromotionFailure",
263 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
264 { "MaxLiveObjectEvacuationRatio",
265 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
266 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
267 { "UseParallelOldGCCompacting",
268 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
269 { "UseParallelDensePrefixUpdate",
270 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
271 { "UseParallelOldGCDensePrefix",
272 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
273 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
274 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
275 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
276 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
277 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
278 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
279 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
280 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
281 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
282 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
283 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
284 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
285 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 #ifdef PRODUCT
294 { "DesiredMethodLimit",
295 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
296 #endif // PRODUCT
297 { NULL, JDK_Version(0), JDK_Version(0) }
298 };
299
300 // Returns true if the flag is obsolete and fits into the range specified
301 // for being ignored. In the case that the flag is ignored, the 'version'
302 // value is filled in with the version number when the flag became
303 // obsolete so that that value can be displayed to the user.
304 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
305 int i = 0;
306 assert(version != NULL, "Must provide a version buffer");
307 while (obsolete_jvm_flags[i].name != NULL) {
308 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
309 // <flag>=xxx form
310 // [-|+]<flag> form
311 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
312 ((s[0] == '+' || s[0] == '-') &&
313 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
314 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
315 *version = flag_status.obsoleted_in;
316 return true;
317 }
318 }
319 i++;
320 }
321 return false;
322 }
323
324 // Constructs the system class path (aka boot class path) from the following
325 // components, in order:
326 //
327 // prefix // from -Xbootclasspath/p:...
328 // endorsed // the expansion of -Djava.endorsed.dirs=...
329 // base // from os::get_system_properties() or -Xbootclasspath=
330 // suffix // from -Xbootclasspath/a:...
331 //
332 // java.endorsed.dirs is a list of directories; any jar or zip files in the
333 // directories are added to the sysclasspath just before the base.
334 //
335 // This could be AllStatic, but it isn't needed after argument processing is
336 // complete.
337 class SysClassPath: public StackObj {
338 public:
339 SysClassPath(const char* base);
340 ~SysClassPath();
341
342 inline void set_base(const char* base);
343 inline void add_prefix(const char* prefix);
344 inline void add_suffix_to_prefix(const char* suffix);
345 inline void add_suffix(const char* suffix);
346 inline void reset_path(const char* base);
347
348 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
349 // property. Must be called after all command-line arguments have been
350 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
351 // combined_path().
352 void expand_endorsed();
353
354 inline const char* get_base() const { return _items[_scp_base]; }
355 inline const char* get_prefix() const { return _items[_scp_prefix]; }
356 inline const char* get_suffix() const { return _items[_scp_suffix]; }
357 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
358
359 // Combine all the components into a single c-heap-allocated string; caller
360 // must free the string if/when no longer needed.
361 char* combined_path();
362
363 private:
364 // Utility routines.
365 static char* add_to_path(const char* path, const char* str, bool prepend);
366 static char* add_jars_to_path(char* path, const char* directory);
367
368 inline void reset_item_at(int index);
369
370 // Array indices for the items that make up the sysclasspath. All except the
371 // base are allocated in the C heap and freed by this class.
372 enum {
373 _scp_prefix, // from -Xbootclasspath/p:...
374 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
375 _scp_base, // the default sysclasspath
376 _scp_suffix, // from -Xbootclasspath/a:...
377 _scp_nitems // the number of items, must be last.
378 };
379
380 const char* _items[_scp_nitems];
381 DEBUG_ONLY(bool _expansion_done;)
382 };
383
384 SysClassPath::SysClassPath(const char* base) {
385 memset(_items, 0, sizeof(_items));
386 _items[_scp_base] = base;
387 DEBUG_ONLY(_expansion_done = false;)
388 }
389
390 SysClassPath::~SysClassPath() {
391 // Free everything except the base.
392 for (int i = 0; i < _scp_nitems; ++i) {
393 if (i != _scp_base) reset_item_at(i);
394 }
395 DEBUG_ONLY(_expansion_done = false;)
396 }
397
398 inline void SysClassPath::set_base(const char* base) {
399 _items[_scp_base] = base;
400 }
401
402 inline void SysClassPath::add_prefix(const char* prefix) {
403 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
404 }
405
406 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
407 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
408 }
409
410 inline void SysClassPath::add_suffix(const char* suffix) {
411 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
412 }
413
414 inline void SysClassPath::reset_item_at(int index) {
415 assert(index < _scp_nitems && index != _scp_base, "just checking");
416 if (_items[index] != NULL) {
417 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
418 _items[index] = NULL;
419 }
420 }
421
422 inline void SysClassPath::reset_path(const char* base) {
423 // Clear the prefix and suffix.
424 reset_item_at(_scp_prefix);
425 reset_item_at(_scp_suffix);
426 set_base(base);
427 }
428
429 //------------------------------------------------------------------------------
430
431 void SysClassPath::expand_endorsed() {
432 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
433
434 const char* path = Arguments::get_property("java.endorsed.dirs");
435 if (path == NULL) {
436 path = Arguments::get_endorsed_dir();
437 assert(path != NULL, "no default for java.endorsed.dirs");
438 }
439
440 char* expanded_path = NULL;
441 const char separator = *os::path_separator();
442 const char* const end = path + strlen(path);
443 while (path < end) {
444 const char* tmp_end = strchr(path, separator);
445 if (tmp_end == NULL) {
446 expanded_path = add_jars_to_path(expanded_path, path);
447 path = end;
448 } else {
449 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
450 memcpy(dirpath, path, tmp_end - path);
451 dirpath[tmp_end - path] = '\0';
452 expanded_path = add_jars_to_path(expanded_path, dirpath);
453 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
454 path = tmp_end + 1;
455 }
456 }
457 _items[_scp_endorsed] = expanded_path;
458 DEBUG_ONLY(_expansion_done = true;)
459 }
460
461 // Combine the bootclasspath elements, some of which may be null, into a single
462 // c-heap-allocated string.
463 char* SysClassPath::combined_path() {
464 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
465 assert(_expansion_done, "must call expand_endorsed() first.");
466
467 size_t lengths[_scp_nitems];
468 size_t total_len = 0;
469
470 const char separator = *os::path_separator();
471
472 // Get the lengths.
473 int i;
474 for (i = 0; i < _scp_nitems; ++i) {
475 if (_items[i] != NULL) {
476 lengths[i] = strlen(_items[i]);
477 // Include space for the separator char (or a NULL for the last item).
478 total_len += lengths[i] + 1;
479 }
480 }
481 assert(total_len > 0, "empty sysclasspath not allowed");
482
483 // Copy the _items to a single string.
484 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
485 char* cp_tmp = cp;
486 for (i = 0; i < _scp_nitems; ++i) {
487 if (_items[i] != NULL) {
488 memcpy(cp_tmp, _items[i], lengths[i]);
489 cp_tmp += lengths[i];
490 *cp_tmp++ = separator;
491 }
492 }
493 *--cp_tmp = '\0'; // Replace the extra separator.
494 return cp;
495 }
496
497 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
498 char*
499 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
500 char *cp;
501
502 assert(str != NULL, "just checking");
503 if (path == NULL) {
504 size_t len = strlen(str) + 1;
505 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
506 memcpy(cp, str, len); // copy the trailing null
507 } else {
508 const char separator = *os::path_separator();
509 size_t old_len = strlen(path);
510 size_t str_len = strlen(str);
511 size_t len = old_len + str_len + 2;
512
513 if (prepend) {
514 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
515 char* cp_tmp = cp;
516 memcpy(cp_tmp, str, str_len);
517 cp_tmp += str_len;
518 *cp_tmp = separator;
519 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
520 FREE_C_HEAP_ARRAY(char, path, mtInternal);
521 } else {
522 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
523 char* cp_tmp = cp + old_len;
524 *cp_tmp = separator;
525 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
526 }
527 }
528 return cp;
529 }
530
531 // Scan the directory and append any jar or zip files found to path.
532 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
533 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
534 DIR* dir = os::opendir(directory);
535 if (dir == NULL) return path;
536
537 char dir_sep[2] = { '\0', '\0' };
538 size_t directory_len = strlen(directory);
539 const char fileSep = *os::file_separator();
540 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
541
542 /* Scan the directory for jars/zips, appending them to path. */
543 struct dirent *entry;
544 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
545 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
546 const char* name = entry->d_name;
547 const char* ext = name + strlen(name) - 4;
548 bool isJarOrZip = ext > name &&
549 (os::file_name_strcmp(ext, ".jar") == 0 ||
550 os::file_name_strcmp(ext, ".zip") == 0);
551 if (isJarOrZip) {
552 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
553 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
554 path = add_to_path(path, jarpath, false);
555 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
556 }
557 }
558 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
559 os::closedir(dir);
560 return path;
561 }
562
563 // Parses a memory size specification string.
564 static bool atomull(const char *s, julong* result) {
565 julong n = 0;
566 int args_read = sscanf(s, JULONG_FORMAT, &n);
567 if (args_read != 1) {
568 return false;
569 }
570 while (*s != '\0' && isdigit(*s)) {
571 s++;
572 }
573 // 4705540: illegal if more characters are found after the first non-digit
574 if (strlen(s) > 1) {
575 return false;
576 }
577 switch (*s) {
578 case 'T': case 't':
579 *result = n * G * K;
580 // Check for overflow.
581 if (*result/((julong)G * K) != n) return false;
582 return true;
583 case 'G': case 'g':
584 *result = n * G;
585 if (*result/G != n) return false;
586 return true;
587 case 'M': case 'm':
588 *result = n * M;
589 if (*result/M != n) return false;
590 return true;
591 case 'K': case 'k':
592 *result = n * K;
593 if (*result/K != n) return false;
594 return true;
595 case '\0':
596 *result = n;
597 return true;
598 default:
599 return false;
600 }
601 }
602
603 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
604 if (size < min_size) return arg_too_small;
605 // Check that size will fit in a size_t (only relevant on 32-bit)
606 if (size > max_uintx) return arg_too_big;
607 return arg_in_range;
608 }
609
610 // Describe an argument out of range error
611 void Arguments::describe_range_error(ArgsRange errcode) {
612 switch(errcode) {
613 case arg_too_big:
614 jio_fprintf(defaultStream::error_stream(),
615 "The specified size exceeds the maximum "
616 "representable size.\n");
617 break;
618 case arg_too_small:
619 case arg_unreadable:
620 case arg_in_range:
621 // do nothing for now
622 break;
623 default:
624 ShouldNotReachHere();
625 }
626 }
627
628 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
629 return CommandLineFlags::boolAtPut(name, &value, origin);
630 }
631
632 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
633 double v;
634 if (sscanf(value, "%lf", &v) != 1) {
635 return false;
636 }
637
638 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
639 return true;
640 }
641 return false;
642 }
643
644 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
645 julong v;
646 intx intx_v;
647 bool is_neg = false;
648 // Check the sign first since atomull() parses only unsigned values.
649 if (*value == '-') {
650 if (!CommandLineFlags::intxAt(name, &intx_v)) {
651 return false;
652 }
653 value++;
654 is_neg = true;
655 }
656 if (!atomull(value, &v)) {
657 return false;
658 }
659 intx_v = (intx) v;
660 if (is_neg) {
661 intx_v = -intx_v;
662 }
663 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
664 return true;
665 }
666 uintx uintx_v = (uintx) v;
667 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
668 return true;
669 }
670 uint64_t uint64_t_v = (uint64_t) v;
671 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
672 return true;
673 }
674 return false;
675 }
676
677 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
678 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
679 // Contract: CommandLineFlags always returns a pointer that needs freeing.
680 FREE_C_HEAP_ARRAY(char, value, mtInternal);
681 return true;
682 }
683
684 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
685 const char* old_value = "";
686 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
687 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
688 size_t new_len = strlen(new_value);
689 const char* value;
690 char* free_this_too = NULL;
691 if (old_len == 0) {
692 value = new_value;
693 } else if (new_len == 0) {
694 value = old_value;
695 } else {
696 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
697 // each new setting adds another LINE to the switch:
698 sprintf(buf, "%s\n%s", old_value, new_value);
699 value = buf;
700 free_this_too = buf;
701 }
702 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
703 // CommandLineFlags always returns a pointer that needs freeing.
704 FREE_C_HEAP_ARRAY(char, value, mtInternal);
705 if (free_this_too != NULL) {
706 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
707 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
708 }
709 return true;
710 }
711
712 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
713
714 // range of acceptable characters spelled out for portability reasons
715 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
716 #define BUFLEN 255
717 char name[BUFLEN+1];
718 char dummy;
719
720 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
721 return set_bool_flag(name, false, origin);
722 }
723 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
724 return set_bool_flag(name, true, origin);
725 }
726
727 char punct;
728 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
729 const char* value = strchr(arg, '=') + 1;
730 Flag* flag = Flag::find_flag(name, strlen(name));
731 if (flag != NULL && flag->is_ccstr()) {
732 if (flag->ccstr_accumulates()) {
733 return append_to_string_flag(name, value, origin);
734 } else {
735 if (value[0] == '\0') {
736 value = NULL;
737 }
738 return set_string_flag(name, value, origin);
739 }
740 }
741 }
742
743 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
744 const char* value = strchr(arg, '=') + 1;
745 // -XX:Foo:=xxx will reset the string flag to the given value.
746 if (value[0] == '\0') {
747 value = NULL;
748 }
749 return set_string_flag(name, value, origin);
750 }
751
752 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
753 #define SIGNED_NUMBER_RANGE "[-0123456789]"
754 #define NUMBER_RANGE "[0123456789]"
755 char value[BUFLEN + 1];
756 char value2[BUFLEN + 1];
757 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
758 // Looks like a floating-point number -- try again with more lenient format string
759 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
760 return set_fp_numeric_flag(name, value, origin);
761 }
762 }
763
764 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
765 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
766 return set_numeric_flag(name, value, origin);
767 }
768
769 return false;
770 }
771
772 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
773 assert(bldarray != NULL, "illegal argument");
774
775 if (arg == NULL) {
776 return;
777 }
778
779 int new_count = *count + 1;
780
781 // expand the array and add arg to the last element
782 if (*bldarray == NULL) {
783 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
784 } else {
785 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
786 }
787 (*bldarray)[*count] = strdup(arg);
788 *count = new_count;
789 }
790
791 void Arguments::build_jvm_args(const char* arg) {
792 add_string(&_jvm_args_array, &_num_jvm_args, arg);
793 }
794
795 void Arguments::build_jvm_flags(const char* arg) {
796 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
797 }
798
799 // utility function to return a string that concatenates all
800 // strings in a given char** array
801 const char* Arguments::build_resource_string(char** args, int count) {
802 if (args == NULL || count == 0) {
803 return NULL;
804 }
805 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
806 for (int i = 1; i < count; i++) {
807 length += strlen(args[i]) + 1; // add 1 for a space
808 }
809 char* s = NEW_RESOURCE_ARRAY(char, length);
810 strcpy(s, args[0]);
811 for (int j = 1; j < count; j++) {
812 strcat(s, " ");
813 strcat(s, args[j]);
814 }
815 return (const char*) s;
816 }
817
818 void Arguments::print_on(outputStream* st) {
819 st->print_cr("VM Arguments:");
820 if (num_jvm_flags() > 0) {
821 st->print("jvm_flags: "); print_jvm_flags_on(st);
822 }
823 if (num_jvm_args() > 0) {
824 st->print("jvm_args: "); print_jvm_args_on(st);
825 }
826 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
827 if (_java_class_path != NULL) {
828 char* path = _java_class_path->value();
829 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
830 }
831 st->print_cr("Launcher Type: %s", _sun_java_launcher);
832 }
833
834 void Arguments::print_jvm_flags_on(outputStream* st) {
835 if (_num_jvm_flags > 0) {
836 for (int i=0; i < _num_jvm_flags; i++) {
837 st->print("%s ", _jvm_flags_array[i]);
838 }
839 st->print_cr("");
840 }
841 }
842
843 void Arguments::print_jvm_args_on(outputStream* st) {
844 if (_num_jvm_args > 0) {
845 for (int i=0; i < _num_jvm_args; i++) {
846 st->print("%s ", _jvm_args_array[i]);
847 }
848 st->print_cr("");
849 }
850 }
851
852 bool Arguments::process_argument(const char* arg,
853 jboolean ignore_unrecognized, FlagValueOrigin origin) {
854
855 JDK_Version since = JDK_Version();
856
857 if (parse_argument(arg, origin) || ignore_unrecognized) {
858 return true;
859 }
860
861 bool has_plus_minus = (*arg == '+' || *arg == '-');
862 const char* const argname = has_plus_minus ? arg + 1 : arg;
863 if (is_newly_obsolete(arg, &since)) {
864 char version[256];
865 since.to_string(version, sizeof(version));
866 warning("ignoring option %s; support was removed in %s", argname, version);
867 return true;
868 }
869
870 // For locked flags, report a custom error message if available.
871 // Otherwise, report the standard unrecognized VM option.
872
873 size_t arg_len;
874 const char* equal_sign = strchr(argname, '=');
875 if (equal_sign == NULL) {
876 arg_len = strlen(argname);
877 } else {
878 arg_len = equal_sign - argname;
879 }
880
881 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true);
882 if (found_flag != NULL) {
883 char locked_message_buf[BUFLEN];
884 found_flag->get_locked_message(locked_message_buf, BUFLEN);
885 if (strlen(locked_message_buf) == 0) {
886 if (found_flag->is_bool() && !has_plus_minus) {
887 jio_fprintf(defaultStream::error_stream(),
888 "Missing +/- setting for VM option '%s'\n", argname);
889 } else if (!found_flag->is_bool() && has_plus_minus) {
890 jio_fprintf(defaultStream::error_stream(),
891 "Unexpected +/- setting in VM option '%s'\n", argname);
892 } else {
893 jio_fprintf(defaultStream::error_stream(),
894 "Improperly specified VM option '%s'\n", argname);
895 }
896 } else {
897 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
898 }
899 } else {
900 jio_fprintf(defaultStream::error_stream(),
901 "Unrecognized VM option '%s'\n", argname);
902 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
903 if (fuzzy_matched != NULL) {
904 jio_fprintf(defaultStream::error_stream(),
905 "Did you mean '%s%s%s'?\n",
906 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
907 fuzzy_matched->name,
908 (fuzzy_matched->is_bool()) ? "" : "=<value>");
909 }
910 }
911
912 // allow for commandline "commenting out" options like -XX:#+Verbose
913 return arg[0] == '#';
914 }
915
916 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
917 FILE* stream = fopen(file_name, "rb");
918 if (stream == NULL) {
919 if (should_exist) {
920 jio_fprintf(defaultStream::error_stream(),
921 "Could not open settings file %s\n", file_name);
922 return false;
923 } else {
924 return true;
925 }
926 }
927
928 char token[1024];
929 int pos = 0;
930
931 bool in_white_space = true;
932 bool in_comment = false;
933 bool in_quote = false;
934 char quote_c = 0;
935 bool result = true;
936
937 int c = getc(stream);
938 while(c != EOF && pos < (int)(sizeof(token)-1)) {
939 if (in_white_space) {
940 if (in_comment) {
941 if (c == '\n') in_comment = false;
942 } else {
943 if (c == '#') in_comment = true;
944 else if (!isspace(c)) {
945 in_white_space = false;
946 token[pos++] = c;
947 }
948 }
949 } else {
950 if (c == '\n' || (!in_quote && isspace(c))) {
951 // token ends at newline, or at unquoted whitespace
952 // this allows a way to include spaces in string-valued options
953 token[pos] = '\0';
954 logOption(token);
955 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
956 build_jvm_flags(token);
957 pos = 0;
958 in_white_space = true;
959 in_quote = false;
960 } else if (!in_quote && (c == '\'' || c == '"')) {
961 in_quote = true;
962 quote_c = c;
963 } else if (in_quote && (c == quote_c)) {
964 in_quote = false;
965 } else {
966 token[pos++] = c;
967 }
968 }
969 c = getc(stream);
970 }
971 if (pos > 0) {
972 token[pos] = '\0';
973 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
974 build_jvm_flags(token);
975 }
976 fclose(stream);
977 return result;
978 }
979
980 //=============================================================================================================
981 // Parsing of properties (-D)
982
983 const char* Arguments::get_property(const char* key) {
984 return PropertyList_get_value(system_properties(), key);
985 }
986
987 bool Arguments::add_property(const char* prop) {
988 const char* eq = strchr(prop, '=');
989 char* key;
990 // ns must be static--its address may be stored in a SystemProperty object.
991 const static char ns[1] = {0};
992 char* value = (char *)ns;
993
994 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
995 key = AllocateHeap(key_len + 1, mtInternal);
996 strncpy(key, prop, key_len);
997 key[key_len] = '\0';
998
999 if (eq != NULL) {
1000 size_t value_len = strlen(prop) - key_len - 1;
1001 value = AllocateHeap(value_len + 1, mtInternal);
1002 strncpy(value, &prop[key_len + 1], value_len + 1);
1003 }
1004
1005 if (strcmp(key, "java.compiler") == 0) {
1006 process_java_compiler_argument(value);
1007 FreeHeap(key);
1008 if (eq != NULL) {
1009 FreeHeap(value);
1010 }
1011 return true;
1012 } else if (strcmp(key, "sun.java.command") == 0) {
1013 _java_command = value;
1014
1015 // Record value in Arguments, but let it get passed to Java.
1016 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1017 // launcher.pid property is private and is processed
1018 // in process_sun_java_launcher_properties();
1019 // the sun.java.launcher property is passed on to the java application
1020 FreeHeap(key);
1021 if (eq != NULL) {
1022 FreeHeap(value);
1023 }
1024 return true;
1025 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1026 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1027 // its value without going through the property list or making a Java call.
1028 _java_vendor_url_bug = value;
1029 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1030 PropertyList_unique_add(&_system_properties, key, value, true);
1031 return true;
1032 }
1033 // Create new property and add at the end of the list
1034 PropertyList_unique_add(&_system_properties, key, value);
1035 return true;
1036 }
1037
1038 //===========================================================================================================
1039 // Setting int/mixed/comp mode flags
1040
1041 void Arguments::set_mode_flags(Mode mode) {
1042 // Set up default values for all flags.
1043 // If you add a flag to any of the branches below,
1044 // add a default value for it here.
1045 set_java_compiler(false);
1046 _mode = mode;
1047
1048 // Ensure Agent_OnLoad has the correct initial values.
1049 // This may not be the final mode; mode may change later in onload phase.
1050 PropertyList_unique_add(&_system_properties, "java.vm.info",
1051 (char*)VM_Version::vm_info_string(), false);
1052
1053 UseInterpreter = true;
1054 UseCompiler = true;
1055 UseLoopCounter = true;
1056
1057 #ifndef ZERO
1058 // Turn these off for mixed and comp. Leave them on for Zero.
1059 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1060 UseFastAccessorMethods = (mode == _int);
1061 }
1062 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1063 UseFastEmptyMethods = (mode == _int);
1064 }
1065 #endif
1066
1067 // Default values may be platform/compiler dependent -
1068 // use the saved values
1069 ClipInlining = Arguments::_ClipInlining;
1070 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1071 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1072 BackgroundCompilation = Arguments::_BackgroundCompilation;
1073
1074 // Change from defaults based on mode
1075 switch (mode) {
1076 default:
1077 ShouldNotReachHere();
1078 break;
1079 case _int:
1080 UseCompiler = false;
1081 UseLoopCounter = false;
1082 AlwaysCompileLoopMethods = false;
1083 UseOnStackReplacement = false;
1084 break;
1085 case _mixed:
1086 // same as default
1087 break;
1088 case _comp:
1089 UseInterpreter = false;
1090 BackgroundCompilation = false;
1091 ClipInlining = false;
1092 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1093 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1094 // compile a level 4 (C2) and then continue executing it.
1095 if (TieredCompilation) {
1096 Tier3InvokeNotifyFreqLog = 0;
1097 Tier4InvocationThreshold = 0;
1098 }
1099 break;
1100 }
1101 }
1102
1103 // Conflict: required to use shared spaces (-Xshare:on), but
1104 // incompatible command line options were chosen.
1105
1106 static void no_shared_spaces() {
1107 if (RequireSharedSpaces) {
1108 jio_fprintf(defaultStream::error_stream(),
1109 "Class data sharing is inconsistent with other specified options.\n");
1110 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1111 } else {
1112 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1113 }
1114 }
1115
1116 void Arguments::set_tiered_flags() {
1117 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1118 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1119 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1120 }
1121 if (CompilationPolicyChoice < 2) {
1122 vm_exit_during_initialization(
1123 "Incompatible compilation policy selected", NULL);
1124 }
1125 // Increase the code cache size - tiered compiles a lot more.
1126 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1127 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1128 }
1129 if (!UseInterpreter) { // -Xcomp
1130 Tier3InvokeNotifyFreqLog = 0;
1131 Tier4InvocationThreshold = 0;
1132 }
1133 }
1134
1135 #if INCLUDE_ALL_GCS
1136 static void disable_adaptive_size_policy(const char* collector_name) {
1137 if (UseAdaptiveSizePolicy) {
1138 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1139 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1140 collector_name);
1141 }
1142 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1143 }
1144 }
1145
1146 void Arguments::set_parnew_gc_flags() {
1147 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1148 "control point invariant");
1149 assert(UseParNewGC, "Error");
1150
1151 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1152 disable_adaptive_size_policy("UseParNewGC");
1153
1154 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1155 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1156 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1157 } else if (ParallelGCThreads == 0) {
1158 jio_fprintf(defaultStream::error_stream(),
1159 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1160 vm_exit(1);
1161 }
1162
1163 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1164 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1165 // we set them to 1024 and 1024.
1166 // See CR 6362902.
1167 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1168 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1169 }
1170 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1171 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1172 }
1173
1174 // AlwaysTenure flag should make ParNew promote all at first collection.
1175 // See CR 6362902.
1176 if (AlwaysTenure) {
1177 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1178 }
1179 // When using compressed oops, we use local overflow stacks,
1180 // rather than using a global overflow list chained through
1181 // the klass word of the object's pre-image.
1182 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1183 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1184 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1185 }
1186 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1187 }
1188 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1189 }
1190
1191 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1192 // sparc/solaris for certain applications, but would gain from
1193 // further optimization and tuning efforts, and would almost
1194 // certainly gain from analysis of platform and environment.
1195 void Arguments::set_cms_and_parnew_gc_flags() {
1196 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1197 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1198
1199 // If we are using CMS, we prefer to UseParNewGC,
1200 // unless explicitly forbidden.
1201 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1202 FLAG_SET_ERGO(bool, UseParNewGC, true);
1203 }
1204
1205 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1206 disable_adaptive_size_policy("UseConcMarkSweepGC");
1207
1208 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1209 // as needed.
1210 if (UseParNewGC) {
1211 set_parnew_gc_flags();
1212 }
1213
1214 size_t max_heap = align_size_down(MaxHeapSize,
1215 CardTableRS::ct_max_alignment_constraint());
1216
1217 // Now make adjustments for CMS
1218 intx tenuring_default = (intx)6;
1219 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1220
1221 // Preferred young gen size for "short" pauses:
1222 // upper bound depends on # of threads and NewRatio.
1223 const uintx parallel_gc_threads =
1224 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1225 const size_t preferred_max_new_size_unaligned =
1226 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1227 size_t preferred_max_new_size =
1228 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1229
1230 // Unless explicitly requested otherwise, size young gen
1231 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1232
1233 // If either MaxNewSize or NewRatio is set on the command line,
1234 // assume the user is trying to set the size of the young gen.
1235 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1236
1237 // Set MaxNewSize to our calculated preferred_max_new_size unless
1238 // NewSize was set on the command line and it is larger than
1239 // preferred_max_new_size.
1240 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1241 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1242 } else {
1243 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1244 }
1245 if (PrintGCDetails && Verbose) {
1246 // Too early to use gclog_or_tty
1247 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1248 }
1249
1250 // Code along this path potentially sets NewSize and OldSize
1251 if (PrintGCDetails && Verbose) {
1252 // Too early to use gclog_or_tty
1253 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1254 " initial_heap_size: " SIZE_FORMAT
1255 " max_heap: " SIZE_FORMAT,
1256 min_heap_size(), InitialHeapSize, max_heap);
1257 }
1258 size_t min_new = preferred_max_new_size;
1259 if (FLAG_IS_CMDLINE(NewSize)) {
1260 min_new = NewSize;
1261 }
1262 if (max_heap > min_new && min_heap_size() > min_new) {
1263 // Unless explicitly requested otherwise, make young gen
1264 // at least min_new, and at most preferred_max_new_size.
1265 if (FLAG_IS_DEFAULT(NewSize)) {
1266 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1267 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1268 if (PrintGCDetails && Verbose) {
1269 // Too early to use gclog_or_tty
1270 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1271 }
1272 }
1273 // Unless explicitly requested otherwise, size old gen
1274 // so it's NewRatio x of NewSize.
1275 if (FLAG_IS_DEFAULT(OldSize)) {
1276 if (max_heap > NewSize) {
1277 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1278 if (PrintGCDetails && Verbose) {
1279 // Too early to use gclog_or_tty
1280 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1281 }
1282 }
1283 }
1284 }
1285 }
1286 // Unless explicitly requested otherwise, definitely
1287 // promote all objects surviving "tenuring_default" scavenges.
1288 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1289 FLAG_IS_DEFAULT(SurvivorRatio)) {
1290 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1291 }
1292 // If we decided above (or user explicitly requested)
1293 // `promote all' (via MaxTenuringThreshold := 0),
1294 // prefer minuscule survivor spaces so as not to waste
1295 // space for (non-existent) survivors
1296 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1297 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1298 }
1299 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1300 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1301 // This is done in order to make ParNew+CMS configuration to work
1302 // with YoungPLABSize and OldPLABSize options.
1303 // See CR 6362902.
1304 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1305 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1306 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1307 // is. In this situation let CMSParPromoteBlocksToClaim follow
1308 // the value (either from the command line or ergonomics) of
1309 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1310 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1311 } else {
1312 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1313 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1314 // we'll let it to take precedence.
1315 jio_fprintf(defaultStream::error_stream(),
1316 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1317 " options are specified for the CMS collector."
1318 " CMSParPromoteBlocksToClaim will take precedence.\n");
1319 }
1320 }
1321 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1322 // OldPLAB sizing manually turned off: Use a larger default setting,
1323 // unless it was manually specified. This is because a too-low value
1324 // will slow down scavenges.
1325 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1326 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1327 }
1328 }
1329 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1330 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1331 // If either of the static initialization defaults have changed, note this
1332 // modification.
1333 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1334 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1335 }
1336 if (PrintGCDetails && Verbose) {
1337 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1338 MarkStackSize / K, MarkStackSizeMax / K);
1339 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1340 }
1341 }
1342 #endif // INCLUDE_ALL_GCS
1343
1344 void set_object_alignment() {
1345 // Object alignment.
1346 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1347 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1348 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1349 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1350 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1351 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1352
1353 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1354 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1355
1356 // Oop encoding heap max
1357 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1358
1359 #if INCLUDE_ALL_GCS
1360 // Set CMS global values
1361 CompactibleFreeListSpace::set_cms_values();
1362 #endif // INCLUDE_ALL_GCS
1363 }
1364
1365 bool verify_object_alignment() {
1366 // Object alignment.
1367 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1368 jio_fprintf(defaultStream::error_stream(),
1369 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1370 (int)ObjectAlignmentInBytes);
1371 return false;
1372 }
1373 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1374 jio_fprintf(defaultStream::error_stream(),
1375 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1376 (int)ObjectAlignmentInBytes, BytesPerLong);
1377 return false;
1378 }
1379 // It does not make sense to have big object alignment
1380 // since a space lost due to alignment will be greater
1381 // then a saved space from compressed oops.
1382 if ((int)ObjectAlignmentInBytes > 256) {
1383 jio_fprintf(defaultStream::error_stream(),
1384 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1385 (int)ObjectAlignmentInBytes);
1386 return false;
1387 }
1388 // In case page size is very small.
1389 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1390 jio_fprintf(defaultStream::error_stream(),
1391 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1392 (int)ObjectAlignmentInBytes, os::vm_page_size());
1393 return false;
1394 }
1395 return true;
1396 }
1397
1398 uintx Arguments::max_heap_for_compressed_oops() {
1399 // Avoid sign flip.
1400 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1401 // We need to fit both the NULL page and the heap into the memory budget, while
1402 // keeping alignment constraints of the heap. To guarantee the latter, as the
1403 // NULL page is located before the heap, we pad the NULL page to the conservative
1404 // maximum alignment that the GC may ever impose upon the heap.
1405 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1406 _conservative_max_heap_alignment);
1407
1408 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1409 NOT_LP64(ShouldNotReachHere(); return 0);
1410 }
1411
1412 bool Arguments::should_auto_select_low_pause_collector() {
1413 if (UseAutoGCSelectPolicy &&
1414 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1415 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1416 if (PrintGCDetails) {
1417 // Cannot use gclog_or_tty yet.
1418 tty->print_cr("Automatic selection of the low pause collector"
1419 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1420 }
1421 return true;
1422 }
1423 return false;
1424 }
1425
1426 void Arguments::set_use_compressed_oops() {
1427 #ifndef ZERO
1428 #ifdef _LP64
1429 // MaxHeapSize is not set up properly at this point, but
1430 // the only value that can override MaxHeapSize if we are
1431 // to use UseCompressedOops is InitialHeapSize.
1432 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1433
1434 if (max_heap_size <= max_heap_for_compressed_oops()) {
1435 #if !defined(COMPILER1) || defined(TIERED)
1436 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1437 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1438 }
1439 #endif
1440 #ifdef _WIN64
1441 if (UseLargePages && UseCompressedOops) {
1442 // Cannot allocate guard pages for implicit checks in indexed addressing
1443 // mode, when large pages are specified on windows.
1444 // This flag could be switched ON if narrow oop base address is set to 0,
1445 // see code in Universe::initialize_heap().
1446 Universe::set_narrow_oop_use_implicit_null_checks(false);
1447 }
1448 #endif // _WIN64
1449 } else {
1450 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1451 warning("Max heap size too large for Compressed Oops");
1452 FLAG_SET_DEFAULT(UseCompressedOops, false);
1453 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1454 }
1455 }
1456 #endif // _LP64
1457 #endif // ZERO
1458 }
1459
1460
1461 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1462 // set_use_compressed_oops().
1463 void Arguments::set_use_compressed_klass_ptrs() {
1464 #ifndef ZERO
1465 #ifdef _LP64
1466 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1467 if (!UseCompressedOops) {
1468 if (UseCompressedClassPointers) {
1469 warning("UseCompressedClassPointers requires UseCompressedOops");
1470 }
1471 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1472 } else {
1473 // Turn on UseCompressedClassPointers too
1474 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1475 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1476 }
1477 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1478 if (UseCompressedClassPointers) {
1479 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1480 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1481 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1482 }
1483 }
1484 }
1485 #endif // _LP64
1486 #endif // !ZERO
1487 }
1488
1489 void Arguments::set_conservative_max_heap_alignment() {
1490 // The conservative maximum required alignment for the heap is the maximum of
1491 // the alignments imposed by several sources: any requirements from the heap
1492 // itself, the collector policy and the maximum page size we may run the VM
1493 // with.
1494 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1495 #if INCLUDE_ALL_GCS
1496 if (UseParallelGC) {
1497 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1498 } else if (UseG1GC) {
1499 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1500 }
1501 #endif // INCLUDE_ALL_GCS
1502 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(),
1503 CollectorPolicy::compute_max_alignment());
1504 }
1505
1506 void Arguments::set_ergonomics_flags() {
1507
1508 if (os::is_server_class_machine()) {
1509 // If no other collector is requested explicitly,
1510 // let the VM select the collector based on
1511 // machine class and automatic selection policy.
1512 if (!UseSerialGC &&
1513 !UseConcMarkSweepGC &&
1514 !UseG1GC &&
1515 !UseParNewGC &&
1516 FLAG_IS_DEFAULT(UseParallelGC)) {
1517 if (should_auto_select_low_pause_collector()) {
1518 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1519 } else {
1520 FLAG_SET_ERGO(bool, UseParallelGC, true);
1521 }
1522 }
1523 // Shared spaces work fine with other GCs but causes bytecode rewriting
1524 // to be disabled, which hurts interpreter performance and decreases
1525 // server performance. On server class machines, keep the default
1526 // off unless it is asked for. Future work: either add bytecode rewriting
1527 // at link time, or rewrite bytecodes in non-shared methods.
1528 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1529 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1530 no_shared_spaces();
1531 }
1532 }
1533
1534 set_conservative_max_heap_alignment();
1535
1536 #ifndef ZERO
1537 #ifdef _LP64
1538 set_use_compressed_oops();
1539
1540 // set_use_compressed_klass_ptrs() must be called after calling
1541 // set_use_compressed_oops().
1542 set_use_compressed_klass_ptrs();
1543
1544 // Also checks that certain machines are slower with compressed oops
1545 // in vm_version initialization code.
1546 #endif // _LP64
1547 #endif // !ZERO
1548 }
1549
1550 void Arguments::set_parallel_gc_flags() {
1551 assert(UseParallelGC || UseParallelOldGC, "Error");
1552 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1553 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1554 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1555 }
1556 FLAG_SET_DEFAULT(UseParallelGC, true);
1557
1558 // If no heap maximum was requested explicitly, use some reasonable fraction
1559 // of the physical memory, up to a maximum of 1GB.
1560 FLAG_SET_DEFAULT(ParallelGCThreads,
1561 Abstract_VM_Version::parallel_worker_threads());
1562 if (ParallelGCThreads == 0) {
1563 jio_fprintf(defaultStream::error_stream(),
1564 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1565 vm_exit(1);
1566 }
1567
1568
1569 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1570 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1571 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1572 // See CR 6362902 for details.
1573 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1574 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1575 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1576 }
1577 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1578 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1579 }
1580 }
1581
1582 if (UseParallelOldGC) {
1583 // Par compact uses lower default values since they are treated as
1584 // minimums. These are different defaults because of the different
1585 // interpretation and are not ergonomically set.
1586 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1587 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1588 }
1589 }
1590 }
1591
1592 void Arguments::set_g1_gc_flags() {
1593 assert(UseG1GC, "Error");
1594 #ifdef COMPILER1
1595 FastTLABRefill = false;
1596 #endif
1597 FLAG_SET_DEFAULT(ParallelGCThreads,
1598 Abstract_VM_Version::parallel_worker_threads());
1599 if (ParallelGCThreads == 0) {
1600 FLAG_SET_DEFAULT(ParallelGCThreads,
1601 Abstract_VM_Version::parallel_worker_threads());
1602 }
1603
1604 // MarkStackSize will be set (if it hasn't been set by the user)
1605 // when concurrent marking is initialized.
1606 // Its value will be based upon the number of parallel marking threads.
1607 // But we do set the maximum mark stack size here.
1608 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1609 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1610 }
1611
1612 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1613 // In G1, we want the default GC overhead goal to be higher than
1614 // say in PS. So we set it here to 10%. Otherwise the heap might
1615 // be expanded more aggressively than we would like it to. In
1616 // fact, even 10% seems to not be high enough in some cases
1617 // (especially small GC stress tests that the main thing they do
1618 // is allocation). We might consider increase it further.
1619 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1620 }
1621
1622 if (PrintGCDetails && Verbose) {
1623 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1624 MarkStackSize / K, MarkStackSizeMax / K);
1625 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1626 }
1627 }
1628
1629 julong Arguments::limit_by_allocatable_memory(julong limit) {
1630 julong max_allocatable;
1631 julong result = limit;
1632 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1633 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1634 }
1635 return result;
1636 }
1637
1638 void Arguments::set_heap_size() {
1639 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1640 // Deprecated flag
1641 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1642 }
1643
1644 const julong phys_mem =
1645 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1646 : (julong)MaxRAM;
1647
1648 // If the maximum heap size has not been set with -Xmx,
1649 // then set it as fraction of the size of physical memory,
1650 // respecting the maximum and minimum sizes of the heap.
1651 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1652 julong reasonable_max = phys_mem / MaxRAMFraction;
1653
1654 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1655 // Small physical memory, so use a minimum fraction of it for the heap
1656 reasonable_max = phys_mem / MinRAMFraction;
1657 } else {
1658 // Not-small physical memory, so require a heap at least
1659 // as large as MaxHeapSize
1660 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1661 }
1662 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1663 // Limit the heap size to ErgoHeapSizeLimit
1664 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1665 }
1666 if (UseCompressedOops) {
1667 // Limit the heap size to the maximum possible when using compressed oops
1668 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1669 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1670 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1671 // but it should be not less than default MaxHeapSize.
1672 max_coop_heap -= HeapBaseMinAddress;
1673 }
1674 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1675 }
1676 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1677
1678 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1679 // An initial heap size was specified on the command line,
1680 // so be sure that the maximum size is consistent. Done
1681 // after call to limit_by_allocatable_memory because that
1682 // method might reduce the allocation size.
1683 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1684 }
1685
1686 if (PrintGCDetails && Verbose) {
1687 // Cannot use gclog_or_tty yet.
1688 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1689 }
1690 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1691 }
1692
1693 // If the minimum or initial heap_size have not been set or requested to be set
1694 // ergonomically, set them accordingly.
1695 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1696 julong reasonable_minimum = (julong)(OldSize + NewSize);
1697
1698 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1699
1700 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1701
1702 if (InitialHeapSize == 0) {
1703 julong reasonable_initial = phys_mem / InitialRAMFraction;
1704
1705 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1706 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1707
1708 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1709
1710 if (PrintGCDetails && Verbose) {
1711 // Cannot use gclog_or_tty yet.
1712 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1713 }
1714 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1715 }
1716 // If the minimum heap size has not been set (via -Xms),
1717 // synchronize with InitialHeapSize to avoid errors with the default value.
1718 if (min_heap_size() == 0) {
1719 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1720 if (PrintGCDetails && Verbose) {
1721 // Cannot use gclog_or_tty yet.
1722 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1723 }
1724 }
1725 }
1726 }
1727
1728 // This must be called after ergonomics because we want bytecode rewriting
1729 // if the server compiler is used, or if UseSharedSpaces is disabled.
1730 void Arguments::set_bytecode_flags() {
1731 // Better not attempt to store into a read-only space.
1732 if (UseSharedSpaces) {
1733 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1734 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1735 }
1736
1737 if (!RewriteBytecodes) {
1738 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1739 }
1740 }
1741
1742 // Aggressive optimization flags -XX:+AggressiveOpts
1743 void Arguments::set_aggressive_opts_flags() {
1744 #ifdef COMPILER2
1745 if (AggressiveUnboxing) {
1746 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1747 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1748 } else if (!EliminateAutoBox) {
1749 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1750 AggressiveUnboxing = false;
1751 }
1752 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1753 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1754 } else if (!DoEscapeAnalysis) {
1755 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1756 AggressiveUnboxing = false;
1757 }
1758 }
1759 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1760 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1761 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1762 }
1763 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1764 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1765 }
1766
1767 // Feed the cache size setting into the JDK
1768 char buffer[1024];
1769 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1770 add_property(buffer);
1771 }
1772 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1773 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1774 }
1775 #endif
1776
1777 if (AggressiveOpts) {
1778 // Sample flag setting code
1779 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1780 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1781 // }
1782 }
1783 }
1784
1785 //===========================================================================================================
1786 // Parsing of java.compiler property
1787
1788 void Arguments::process_java_compiler_argument(char* arg) {
1789 // For backwards compatibility, Djava.compiler=NONE or ""
1790 // causes us to switch to -Xint mode UNLESS -Xdebug
1791 // is also specified.
1792 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1793 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1794 }
1795 }
1796
1797 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1798 _sun_java_launcher = strdup(launcher);
1799 if (strcmp("gamma", _sun_java_launcher) == 0) {
1800 _created_by_gamma_launcher = true;
1801 }
1802 }
1803
1804 bool Arguments::created_by_java_launcher() {
1805 assert(_sun_java_launcher != NULL, "property must have value");
1806 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1807 }
1808
1809 bool Arguments::created_by_gamma_launcher() {
1810 return _created_by_gamma_launcher;
1811 }
1812
1813 //===========================================================================================================
1814 // Parsing of main arguments
1815
1816 bool Arguments::verify_interval(uintx val, uintx min,
1817 uintx max, const char* name) {
1818 // Returns true iff value is in the inclusive interval [min..max]
1819 // false, otherwise.
1820 if (val >= min && val <= max) {
1821 return true;
1822 }
1823 jio_fprintf(defaultStream::error_stream(),
1824 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1825 " and " UINTX_FORMAT "\n",
1826 name, val, min, max);
1827 return false;
1828 }
1829
1830 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1831 // Returns true if given value is at least specified min threshold
1832 // false, otherwise.
1833 if (val >= min ) {
1834 return true;
1835 }
1836 jio_fprintf(defaultStream::error_stream(),
1837 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1838 name, val, min);
1839 return false;
1840 }
1841
1842 bool Arguments::verify_percentage(uintx value, const char* name) {
1843 if (value <= 100) {
1844 return true;
1845 }
1846 jio_fprintf(defaultStream::error_stream(),
1847 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1848 name, value);
1849 return false;
1850 }
1851
1852 #if !INCLUDE_ALL_GCS
1853 #ifdef ASSERT
1854 static bool verify_serial_gc_flags() {
1855 return (UseSerialGC &&
1856 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1857 UseParallelGC || UseParallelOldGC));
1858 }
1859 #endif // ASSERT
1860 #endif // INCLUDE_ALL_GCS
1861
1862 // check if do gclog rotation
1863 // +UseGCLogFileRotation is a must,
1864 // no gc log rotation when log file not supplied or
1865 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1866 void check_gclog_consistency() {
1867 if (UseGCLogFileRotation) {
1868 if ((Arguments::gc_log_filename() == NULL) ||
1869 (NumberOfGCLogFiles == 0) ||
1870 (GCLogFileSize == 0)) {
1871 jio_fprintf(defaultStream::output_stream(),
1872 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1873 "where num_of_file > 0 and num_of_size > 0\n"
1874 "GC log rotation is turned off\n");
1875 UseGCLogFileRotation = false;
1876 }
1877 }
1878
1879 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1880 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1881 jio_fprintf(defaultStream::output_stream(),
1882 "GCLogFileSize changed to minimum 8K\n");
1883 }
1884 }
1885
1886 // Check consistency of GC selection
1887 bool Arguments::check_gc_consistency() {
1888 check_gclog_consistency();
1889 bool status = true;
1890 // Ensure that the user has not selected conflicting sets
1891 // of collectors. [Note: this check is merely a user convenience;
1892 // collectors over-ride each other so that only a non-conflicting
1893 // set is selected; however what the user gets is not what they
1894 // may have expected from the combination they asked for. It's
1895 // better to reduce user confusion by not allowing them to
1896 // select conflicting combinations.
1897 uint i = 0;
1898 if (UseSerialGC) i++;
1899 if (UseConcMarkSweepGC || UseParNewGC) i++;
1900 if (UseParallelGC || UseParallelOldGC) i++;
1901 if (UseG1GC) i++;
1902 if (i > 1) {
1903 jio_fprintf(defaultStream::error_stream(),
1904 "Conflicting collector combinations in option list; "
1905 "please refer to the release notes for the combinations "
1906 "allowed\n");
1907 status = false;
1908 } else if (ReservedCodeCacheSize > 2*G) {
1909 // Code cache size larger than MAXINT is not supported.
1910 jio_fprintf(defaultStream::error_stream(),
1911 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
1912 (2*G)/M);
1913 status = false;
1914 }
1915 return status;
1916 }
1917
1918 void Arguments::check_deprecated_gcs() {
1919 if (UseConcMarkSweepGC && !UseParNewGC) {
1920 warning("Using the DefNew young collector with the CMS collector is deprecated "
1921 "and will likely be removed in a future release");
1922 }
1923
1924 if (UseParNewGC && !UseConcMarkSweepGC) {
1925 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1926 // set up UseSerialGC properly, so that can't be used in the check here.
1927 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1928 "and will likely be removed in a future release");
1929 }
1930
1931 if (CMSIncrementalMode) {
1932 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1933 }
1934 }
1935
1936 void Arguments::check_deprecated_gc_flags() {
1937 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
1938 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
1939 "and will likely be removed in future release");
1940 }
1941 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
1942 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
1943 "Use MaxRAMFraction instead.");
1944 }
1945 }
1946
1947 // Check stack pages settings
1948 bool Arguments::check_stack_pages()
1949 {
1950 bool status = true;
1951 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1952 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1953 // greater stack shadow pages can't generate instruction to bang stack
1954 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1955 return status;
1956 }
1957
1958 // Check the consistency of vm_init_args
1959 bool Arguments::check_vm_args_consistency() {
1960 // Method for adding checks for flag consistency.
1961 // The intent is to warn the user of all possible conflicts,
1962 // before returning an error.
1963 // Note: Needs platform-dependent factoring.
1964 bool status = true;
1965
1966 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1967 // builds so the cost of stack banging can be measured.
1968 #if (defined(PRODUCT) && defined(SOLARIS))
1969 if (!UseBoundThreads && !UseStackBanging) {
1970 jio_fprintf(defaultStream::error_stream(),
1971 "-UseStackBanging conflicts with -UseBoundThreads\n");
1972
1973 status = false;
1974 }
1975 #endif
1976
1977 if (TLABRefillWasteFraction == 0) {
1978 jio_fprintf(defaultStream::error_stream(),
1979 "TLABRefillWasteFraction should be a denominator, "
1980 "not " SIZE_FORMAT "\n",
1981 TLABRefillWasteFraction);
1982 status = false;
1983 }
1984
1985 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
1986 "AdaptiveSizePolicyWeight");
1987 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1988 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1989 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1990
1991 // Divide by bucket size to prevent a large size from causing rollover when
1992 // calculating amount of memory needed to be allocated for the String table.
1993 status = status && verify_interval(StringTableSize, minimumStringTableSize,
1994 (max_uintx / StringTable::bucket_size()), "StringTable size");
1995
1996 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1997 jio_fprintf(defaultStream::error_stream(),
1998 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1999 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
2000 MinHeapFreeRatio, MaxHeapFreeRatio);
2001 status = false;
2002 }
2003 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2004 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
2005
2006 // Min/MaxMetaspaceFreeRatio
2007 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2008 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2009
2010 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2011 jio_fprintf(defaultStream::error_stream(),
2012 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2013 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2014 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2015 MinMetaspaceFreeRatio,
2016 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2017 MaxMetaspaceFreeRatio);
2018 status = false;
2019 }
2020
2021 // Trying to keep 100% free is not practical
2022 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2023
2024 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2025 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2026 }
2027
2028 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2029 // Settings to encourage splitting.
2030 if (!FLAG_IS_CMDLINE(NewRatio)) {
2031 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2032 }
2033 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2034 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2035 }
2036 }
2037
2038 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2039 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2040 if (GCTimeLimit == 100) {
2041 // Turn off gc-overhead-limit-exceeded checks
2042 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2043 }
2044
2045 status = status && check_gc_consistency();
2046 status = status && check_stack_pages();
2047
2048 if (CMSIncrementalMode) {
2049 if (!UseConcMarkSweepGC) {
2050 jio_fprintf(defaultStream::error_stream(),
2051 "error: invalid argument combination.\n"
2052 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2053 "selected in order\nto use CMSIncrementalMode.\n");
2054 status = false;
2055 } else {
2056 status = status && verify_percentage(CMSIncrementalDutyCycle,
2057 "CMSIncrementalDutyCycle");
2058 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2059 "CMSIncrementalDutyCycleMin");
2060 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2061 "CMSIncrementalSafetyFactor");
2062 status = status && verify_percentage(CMSIncrementalOffset,
2063 "CMSIncrementalOffset");
2064 status = status && verify_percentage(CMSExpAvgFactor,
2065 "CMSExpAvgFactor");
2066 // If it was not set on the command line, set
2067 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2068 if (CMSInitiatingOccupancyFraction < 0) {
2069 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2070 }
2071 }
2072 }
2073
2074 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2075 // insists that we hold the requisite locks so that the iteration is
2076 // MT-safe. For the verification at start-up and shut-down, we don't
2077 // yet have a good way of acquiring and releasing these locks,
2078 // which are not visible at the CollectedHeap level. We want to
2079 // be able to acquire these locks and then do the iteration rather
2080 // than just disable the lock verification. This will be fixed under
2081 // bug 4788986.
2082 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2083 if (VerifyDuringStartup) {
2084 warning("Heap verification at start-up disabled "
2085 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2086 VerifyDuringStartup = false; // Disable verification at start-up
2087 }
2088
2089 if (VerifyBeforeExit) {
2090 warning("Heap verification at shutdown disabled "
2091 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2092 VerifyBeforeExit = false; // Disable verification at shutdown
2093 }
2094 }
2095
2096 // Note: only executed in non-PRODUCT mode
2097 if (!UseAsyncConcMarkSweepGC &&
2098 (ExplicitGCInvokesConcurrent ||
2099 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2100 jio_fprintf(defaultStream::error_stream(),
2101 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2102 " with -UseAsyncConcMarkSweepGC");
2103 status = false;
2104 }
2105
2106 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2107
2108 #if INCLUDE_ALL_GCS
2109 if (UseG1GC) {
2110 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2111 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2112 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2113
2114 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2115 "InitiatingHeapOccupancyPercent");
2116 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2117 "G1RefProcDrainInterval");
2118 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2119 "G1ConcMarkStepDurationMillis");
2120 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2121 "G1ConcRSHotCardLimit");
2122 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2123 "G1ConcRSLogCacheSize");
2124 }
2125 if (UseConcMarkSweepGC) {
2126 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2127 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2128 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2129 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2130
2131 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2132
2133 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2134 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2135 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2136
2137 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2138
2139 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2140 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2141
2142 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2143 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2144 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2145
2146 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2147
2148 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2149
2150 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2151 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2152 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2153 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2154 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2155 }
2156
2157 if (UseParallelGC || UseParallelOldGC) {
2158 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2159 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2160
2161 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2162 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2163
2164 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2165 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2166
2167 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2168
2169 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2170 }
2171 #endif // INCLUDE_ALL_GCS
2172
2173 status = status && verify_interval(RefDiscoveryPolicy,
2174 ReferenceProcessor::DiscoveryPolicyMin,
2175 ReferenceProcessor::DiscoveryPolicyMax,
2176 "RefDiscoveryPolicy");
2177
2178 // Limit the lower bound of this flag to 1 as it is used in a division
2179 // expression.
2180 status = status && verify_interval(TLABWasteTargetPercent,
2181 1, 100, "TLABWasteTargetPercent");
2182
2183 status = status && verify_object_alignment();
2184
2185 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2186 "CompressedClassSpaceSize");
2187
2188 status = status && verify_interval(MarkStackSizeMax,
2189 1, (max_jint - 1), "MarkStackSizeMax");
2190 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2191
2192 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2193
2194 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2195
2196 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2197
2198 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2199 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2200
2201 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2202
2203 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2204 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2205 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2206 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2207
2208 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2209 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2210
2211 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2212 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2213 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2214
2215 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2216 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2217
2218 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2219 // just for that, so hardcode here.
2220 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2221 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2222 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2223 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2224
2225 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2226 #ifdef SPARC
2227 if (UseConcMarkSweepGC || UseG1GC) {
2228 // Issue a stern warning if the user has explicitly set
2229 // UseMemSetInBOT (it is known to cause issues), but allow
2230 // use for experimentation and debugging.
2231 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2232 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2233 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2234 " on sun4v; please understand that you are using at your own risk!");
2235 }
2236 }
2237 #endif // SPARC
2238
2239 if (PrintNMTStatistics) {
2240 #if INCLUDE_NMT
2241 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2242 #endif // INCLUDE_NMT
2243 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2244 PrintNMTStatistics = false;
2245 #if INCLUDE_NMT
2246 }
2247 #endif
2248 }
2249
2250 // Need to limit the extent of the padding to reasonable size.
2251 // 8K is well beyond the reasonable HW cache line size, even with the
2252 // aggressive prefetching, while still leaving the room for segregating
2253 // among the distinct pages.
2254 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2255 jio_fprintf(defaultStream::error_stream(),
2256 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2257 ContendedPaddingWidth, 0, 8192);
2258 status = false;
2259 }
2260
2261 // Need to enforce the padding not to break the existing field alignments.
2262 // It is sufficient to check against the largest type size.
2263 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2264 jio_fprintf(defaultStream::error_stream(),
2265 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2266 ContendedPaddingWidth, BytesPerLong);
2267 status = false;
2268 }
2269
2270 // Check lower bounds of the code cache
2271 // Template Interpreter code is approximately 3X larger in debug builds.
2272 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2273 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2274 jio_fprintf(defaultStream::error_stream(),
2275 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2276 os::vm_page_size()/K);
2277 status = false;
2278 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2279 jio_fprintf(defaultStream::error_stream(),
2280 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2281 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2282 status = false;
2283 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2284 jio_fprintf(defaultStream::error_stream(),
2285 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2286 min_code_cache_size/K);
2287 status = false;
2288 } else if (ReservedCodeCacheSize > 2*G) {
2289 // Code cache size larger than MAXINT is not supported.
2290 jio_fprintf(defaultStream::error_stream(),
2291 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2292 (2*G)/M);
2293 status = false;
2294 }
2295 return status;
2296 }
2297
2298 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2299 const char* option_type) {
2300 if (ignore) return false;
2301
2302 const char* spacer = " ";
2303 if (option_type == NULL) {
2304 option_type = ++spacer; // Set both to the empty string.
2305 }
2306
2307 if (os::obsolete_option(option)) {
2308 jio_fprintf(defaultStream::error_stream(),
2309 "Obsolete %s%soption: %s\n", option_type, spacer,
2310 option->optionString);
2311 return false;
2312 } else {
2313 jio_fprintf(defaultStream::error_stream(),
2314 "Unrecognized %s%soption: %s\n", option_type, spacer,
2315 option->optionString);
2316 return true;
2317 }
2318 }
2319
2320 static const char* user_assertion_options[] = {
2321 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2322 };
2323
2324 static const char* system_assertion_options[] = {
2325 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2326 };
2327
2328 // Return true if any of the strings in null-terminated array 'names' matches.
2329 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2330 // the option must match exactly.
2331 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2332 bool tail_allowed) {
2333 for (/* empty */; *names != NULL; ++names) {
2334 if (match_option(option, *names, tail)) {
2335 if (**tail == '\0' || tail_allowed && **tail == ':') {
2336 return true;
2337 }
2338 }
2339 }
2340 return false;
2341 }
2342
2343 bool Arguments::parse_uintx(const char* value,
2344 uintx* uintx_arg,
2345 uintx min_size) {
2346
2347 // Check the sign first since atomull() parses only unsigned values.
2348 bool value_is_positive = !(*value == '-');
2349
2350 if (value_is_positive) {
2351 julong n;
2352 bool good_return = atomull(value, &n);
2353 if (good_return) {
2354 bool above_minimum = n >= min_size;
2355 bool value_is_too_large = n > max_uintx;
2356
2357 if (above_minimum && !value_is_too_large) {
2358 *uintx_arg = n;
2359 return true;
2360 }
2361 }
2362 }
2363 return false;
2364 }
2365
2366 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2367 julong* long_arg,
2368 julong min_size) {
2369 if (!atomull(s, long_arg)) return arg_unreadable;
2370 return check_memory_size(*long_arg, min_size);
2371 }
2372
2373 // Parse JavaVMInitArgs structure
2374
2375 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2376 // For components of the system classpath.
2377 SysClassPath scp(Arguments::get_sysclasspath());
2378 bool scp_assembly_required = false;
2379
2380 // Save default settings for some mode flags
2381 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2382 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2383 Arguments::_ClipInlining = ClipInlining;
2384 Arguments::_BackgroundCompilation = BackgroundCompilation;
2385
2386 // Setup flags for mixed which is the default
2387 set_mode_flags(_mixed);
2388
2389 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2390 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2391 if (result != JNI_OK) {
2392 return result;
2393 }
2394
2395 // Parse JavaVMInitArgs structure passed in
2396 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2397 if (result != JNI_OK) {
2398 return result;
2399 }
2400
2401 if (AggressiveOpts) {
2402 // Insert alt-rt.jar between user-specified bootclasspath
2403 // prefix and the default bootclasspath. os::set_boot_path()
2404 // uses meta_index_dir as the default bootclasspath directory.
2405 const char* altclasses_jar = "alt-rt.jar";
2406 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2407 strlen(altclasses_jar);
2408 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2409 strcpy(altclasses_path, get_meta_index_dir());
2410 strcat(altclasses_path, altclasses_jar);
2411 scp.add_suffix_to_prefix(altclasses_path);
2412 scp_assembly_required = true;
2413 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2414 }
2415
2416 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2417 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2418 if (result != JNI_OK) {
2419 return result;
2420 }
2421
2422 // Do final processing now that all arguments have been parsed
2423 result = finalize_vm_init_args(&scp, scp_assembly_required);
2424 if (result != JNI_OK) {
2425 return result;
2426 }
2427
2428 return JNI_OK;
2429 }
2430
2431 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2432 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2433 // are dealing with -agentpath (case where name is a path), otherwise with
2434 // -agentlib
2435 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2436 char *_name;
2437 const char *_hprof = "hprof", *_jdwp = "jdwp";
2438 size_t _len_hprof, _len_jdwp, _len_prefix;
2439
2440 if (is_path) {
2441 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2442 return false;
2443 }
2444
2445 _name++; // skip past last path separator
2446 _len_prefix = strlen(JNI_LIB_PREFIX);
2447
2448 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2449 return false;
2450 }
2451
2452 _name += _len_prefix;
2453 _len_hprof = strlen(_hprof);
2454 _len_jdwp = strlen(_jdwp);
2455
2456 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2457 _name += _len_hprof;
2458 }
2459 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2460 _name += _len_jdwp;
2461 }
2462 else {
2463 return false;
2464 }
2465
2466 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2467 return false;
2468 }
2469
2470 return true;
2471 }
2472
2473 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2474 return true;
2475 }
2476
2477 return false;
2478 }
2479
2480 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2481 SysClassPath* scp_p,
2482 bool* scp_assembly_required_p,
2483 FlagValueOrigin origin) {
2484 // Remaining part of option string
2485 const char* tail;
2486
2487 // iterate over arguments
2488 for (int index = 0; index < args->nOptions; index++) {
2489 bool is_absolute_path = false; // for -agentpath vs -agentlib
2490
2491 const JavaVMOption* option = args->options + index;
2492
2493 if (!match_option(option, "-Djava.class.path", &tail) &&
2494 !match_option(option, "-Dsun.java.command", &tail) &&
2495 !match_option(option, "-Dsun.java.launcher", &tail)) {
2496
2497 // add all jvm options to the jvm_args string. This string
2498 // is used later to set the java.vm.args PerfData string constant.
2499 // the -Djava.class.path and the -Dsun.java.command options are
2500 // omitted from jvm_args string as each have their own PerfData
2501 // string constant object.
2502 build_jvm_args(option->optionString);
2503 }
2504
2505 // -verbose:[class/gc/jni]
2506 if (match_option(option, "-verbose", &tail)) {
2507 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2508 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2509 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2510 } else if (!strcmp(tail, ":gc")) {
2511 FLAG_SET_CMDLINE(bool, PrintGC, true);
2512 } else if (!strcmp(tail, ":jni")) {
2513 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2514 }
2515 // -da / -ea / -disableassertions / -enableassertions
2516 // These accept an optional class/package name separated by a colon, e.g.,
2517 // -da:java.lang.Thread.
2518 } else if (match_option(option, user_assertion_options, &tail, true)) {
2519 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2520 if (*tail == '\0') {
2521 JavaAssertions::setUserClassDefault(enable);
2522 } else {
2523 assert(*tail == ':', "bogus match by match_option()");
2524 JavaAssertions::addOption(tail + 1, enable);
2525 }
2526 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2527 } else if (match_option(option, system_assertion_options, &tail, false)) {
2528 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2529 JavaAssertions::setSystemClassDefault(enable);
2530 // -bootclasspath:
2531 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2532 scp_p->reset_path(tail);
2533 *scp_assembly_required_p = true;
2534 // -bootclasspath/a:
2535 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2536 scp_p->add_suffix(tail);
2537 *scp_assembly_required_p = true;
2538 // -bootclasspath/p:
2539 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2540 scp_p->add_prefix(tail);
2541 *scp_assembly_required_p = true;
2542 // -Xrun
2543 } else if (match_option(option, "-Xrun", &tail)) {
2544 if (tail != NULL) {
2545 const char* pos = strchr(tail, ':');
2546 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2547 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2548 name[len] = '\0';
2549
2550 char *options = NULL;
2551 if(pos != NULL) {
2552 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2553 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2554 }
2555 #if !INCLUDE_JVMTI
2556 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2557 jio_fprintf(defaultStream::error_stream(),
2558 "Profiling and debugging agents are not supported in this VM\n");
2559 return JNI_ERR;
2560 }
2561 #endif // !INCLUDE_JVMTI
2562 add_init_library(name, options);
2563 }
2564 // -agentlib and -agentpath
2565 } else if (match_option(option, "-agentlib:", &tail) ||
2566 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2567 if(tail != NULL) {
2568 const char* pos = strchr(tail, '=');
2569 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2570 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2571 name[len] = '\0';
2572
2573 char *options = NULL;
2574 if(pos != NULL) {
2575 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2576 }
2577 #if !INCLUDE_JVMTI
2578 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2579 jio_fprintf(defaultStream::error_stream(),
2580 "Profiling and debugging agents are not supported in this VM\n");
2581 return JNI_ERR;
2582 }
2583 #endif // !INCLUDE_JVMTI
2584 add_init_agent(name, options, is_absolute_path);
2585 }
2586 // -javaagent
2587 } else if (match_option(option, "-javaagent:", &tail)) {
2588 #if !INCLUDE_JVMTI
2589 jio_fprintf(defaultStream::error_stream(),
2590 "Instrumentation agents are not supported in this VM\n");
2591 return JNI_ERR;
2592 #else
2593 if(tail != NULL) {
2594 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2595 add_init_agent("instrument", options, false);
2596 }
2597 #endif // !INCLUDE_JVMTI
2598 // -Xnoclassgc
2599 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2600 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2601 // -Xincgc: i-CMS
2602 } else if (match_option(option, "-Xincgc", &tail)) {
2603 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2604 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2605 // -Xnoincgc: no i-CMS
2606 } else if (match_option(option, "-Xnoincgc", &tail)) {
2607 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2608 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2609 // -Xconcgc
2610 } else if (match_option(option, "-Xconcgc", &tail)) {
2611 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2612 // -Xnoconcgc
2613 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2614 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2615 // -Xbatch
2616 } else if (match_option(option, "-Xbatch", &tail)) {
2617 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2618 // -Xmn for compatibility with other JVM vendors
2619 } else if (match_option(option, "-Xmn", &tail)) {
2620 julong long_initial_young_size = 0;
2621 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2622 if (errcode != arg_in_range) {
2623 jio_fprintf(defaultStream::error_stream(),
2624 "Invalid initial young generation size: %s\n", option->optionString);
2625 describe_range_error(errcode);
2626 return JNI_EINVAL;
2627 }
2628 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2629 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2630 // -Xms
2631 } else if (match_option(option, "-Xms", &tail)) {
2632 julong long_initial_heap_size = 0;
2633 // an initial heap size of 0 means automatically determine
2634 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2635 if (errcode != arg_in_range) {
2636 jio_fprintf(defaultStream::error_stream(),
2637 "Invalid initial heap size: %s\n", option->optionString);
2638 describe_range_error(errcode);
2639 return JNI_EINVAL;
2640 }
2641 set_min_heap_size((uintx)long_initial_heap_size);
2642 // Currently the minimum size and the initial heap sizes are the same.
2643 // Can be overridden with -XX:InitialHeapSize.
2644 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2645 // -Xmx
2646 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2647 julong long_max_heap_size = 0;
2648 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2649 if (errcode != arg_in_range) {
2650 jio_fprintf(defaultStream::error_stream(),
2651 "Invalid maximum heap size: %s\n", option->optionString);
2652 describe_range_error(errcode);
2653 return JNI_EINVAL;
2654 }
2655 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2656 // Xmaxf
2657 } else if (match_option(option, "-Xmaxf", &tail)) {
2658 int maxf = (int)(atof(tail) * 100);
2659 if (maxf < 0 || maxf > 100) {
2660 jio_fprintf(defaultStream::error_stream(),
2661 "Bad max heap free percentage size: %s\n",
2662 option->optionString);
2663 return JNI_EINVAL;
2664 } else {
2665 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2666 }
2667 // Xminf
2668 } else if (match_option(option, "-Xminf", &tail)) {
2669 int minf = (int)(atof(tail) * 100);
2670 if (minf < 0 || minf > 100) {
2671 jio_fprintf(defaultStream::error_stream(),
2672 "Bad min heap free percentage size: %s\n",
2673 option->optionString);
2674 return JNI_EINVAL;
2675 } else {
2676 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2677 }
2678 // -Xss
2679 } else if (match_option(option, "-Xss", &tail)) {
2680 julong long_ThreadStackSize = 0;
2681 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2682 if (errcode != arg_in_range) {
2683 jio_fprintf(defaultStream::error_stream(),
2684 "Invalid thread stack size: %s\n", option->optionString);
2685 describe_range_error(errcode);
2686 return JNI_EINVAL;
2687 }
2688 // Internally track ThreadStackSize in units of 1024 bytes.
2689 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2690 round_to((int)long_ThreadStackSize, K) / K);
2691 // -Xoss
2692 } else if (match_option(option, "-Xoss", &tail)) {
2693 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2694 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2695 julong long_CodeCacheExpansionSize = 0;
2696 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2697 if (errcode != arg_in_range) {
2698 jio_fprintf(defaultStream::error_stream(),
2699 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2700 os::vm_page_size()/K);
2701 return JNI_EINVAL;
2702 }
2703 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2704 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2705 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2706 julong long_ReservedCodeCacheSize = 0;
2707
2708 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2709 if (errcode != arg_in_range) {
2710 jio_fprintf(defaultStream::error_stream(),
2711 "Invalid maximum code cache size: %s.\n", option->optionString);
2712 return JNI_EINVAL;
2713 }
2714 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2715 //-XX:IncreaseFirstTierCompileThresholdAt=
2716 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2717 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2718 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2719 jio_fprintf(defaultStream::error_stream(),
2720 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2721 option->optionString);
2722 return JNI_EINVAL;
2723 }
2724 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2725 // -green
2726 } else if (match_option(option, "-green", &tail)) {
2727 jio_fprintf(defaultStream::error_stream(),
2728 "Green threads support not available\n");
2729 return JNI_EINVAL;
2730 // -native
2731 } else if (match_option(option, "-native", &tail)) {
2732 // HotSpot always uses native threads, ignore silently for compatibility
2733 // -Xsqnopause
2734 } else if (match_option(option, "-Xsqnopause", &tail)) {
2735 // EVM option, ignore silently for compatibility
2736 // -Xrs
2737 } else if (match_option(option, "-Xrs", &tail)) {
2738 // Classic/EVM option, new functionality
2739 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2740 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2741 // change default internal VM signals used - lower case for back compat
2742 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2743 // -Xoptimize
2744 } else if (match_option(option, "-Xoptimize", &tail)) {
2745 // EVM option, ignore silently for compatibility
2746 // -Xprof
2747 } else if (match_option(option, "-Xprof", &tail)) {
2748 #if INCLUDE_FPROF
2749 _has_profile = true;
2750 #else // INCLUDE_FPROF
2751 jio_fprintf(defaultStream::error_stream(),
2752 "Flat profiling is not supported in this VM.\n");
2753 return JNI_ERR;
2754 #endif // INCLUDE_FPROF
2755 // -Xconcurrentio
2756 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2757 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2758 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2759 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2760 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2761 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2762
2763 // -Xinternalversion
2764 } else if (match_option(option, "-Xinternalversion", &tail)) {
2765 jio_fprintf(defaultStream::output_stream(), "%s\n",
2766 VM_Version::internal_vm_info_string());
2767 vm_exit(0);
2768 #ifndef PRODUCT
2769 // -Xprintflags
2770 } else if (match_option(option, "-Xprintflags", &tail)) {
2771 CommandLineFlags::printFlags(tty, false);
2772 vm_exit(0);
2773 #endif
2774 // -D
2775 } else if (match_option(option, "-D", &tail)) {
2776 if (!add_property(tail)) {
2777 return JNI_ENOMEM;
2778 }
2779 // Out of the box management support
2780 if (match_option(option, "-Dcom.sun.management", &tail)) {
2781 #if INCLUDE_MANAGEMENT
2782 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2783 #else
2784 jio_fprintf(defaultStream::output_stream(),
2785 "-Dcom.sun.management is not supported in this VM.\n");
2786 return JNI_ERR;
2787 #endif
2788 }
2789 // -Xint
2790 } else if (match_option(option, "-Xint", &tail)) {
2791 set_mode_flags(_int);
2792 // -Xmixed
2793 } else if (match_option(option, "-Xmixed", &tail)) {
2794 set_mode_flags(_mixed);
2795 // -Xcomp
2796 } else if (match_option(option, "-Xcomp", &tail)) {
2797 // for testing the compiler; turn off all flags that inhibit compilation
2798 set_mode_flags(_comp);
2799 // -Xshare:dump
2800 } else if (match_option(option, "-Xshare:dump", &tail)) {
2801 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2802 set_mode_flags(_int); // Prevent compilation, which creates objects
2803 // -Xshare:on
2804 } else if (match_option(option, "-Xshare:on", &tail)) {
2805 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2806 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2807 // -Xshare:auto
2808 } else if (match_option(option, "-Xshare:auto", &tail)) {
2809 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2810 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2811 // -Xshare:off
2812 } else if (match_option(option, "-Xshare:off", &tail)) {
2813 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2814 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2815 // -Xverify
2816 } else if (match_option(option, "-Xverify", &tail)) {
2817 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2818 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2819 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2820 } else if (strcmp(tail, ":remote") == 0) {
2821 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2822 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2823 } else if (strcmp(tail, ":none") == 0) {
2824 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2825 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2826 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2827 return JNI_EINVAL;
2828 }
2829 // -Xdebug
2830 } else if (match_option(option, "-Xdebug", &tail)) {
2831 // note this flag has been used, then ignore
2832 set_xdebug_mode(true);
2833 // -Xnoagent
2834 } else if (match_option(option, "-Xnoagent", &tail)) {
2835 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2836 } else if (match_option(option, "-Xboundthreads", &tail)) {
2837 // Bind user level threads to kernel threads (Solaris only)
2838 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2839 } else if (match_option(option, "-Xloggc:", &tail)) {
2840 // Redirect GC output to the file. -Xloggc:<filename>
2841 // ostream_init_log(), when called will use this filename
2842 // to initialize a fileStream.
2843 _gc_log_filename = strdup(tail);
2844 FLAG_SET_CMDLINE(bool, PrintGC, true);
2845 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2846
2847 // JNI hooks
2848 } else if (match_option(option, "-Xcheck", &tail)) {
2849 if (!strcmp(tail, ":jni")) {
2850 #if !INCLUDE_JNI_CHECK
2851 warning("JNI CHECKING is not supported in this VM");
2852 #else
2853 CheckJNICalls = true;
2854 #endif // INCLUDE_JNI_CHECK
2855 } else if (is_bad_option(option, args->ignoreUnrecognized,
2856 "check")) {
2857 return JNI_EINVAL;
2858 }
2859 } else if (match_option(option, "vfprintf", &tail)) {
2860 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2861 } else if (match_option(option, "exit", &tail)) {
2862 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2863 } else if (match_option(option, "abort", &tail)) {
2864 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2865 // -XX:+AggressiveHeap
2866 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2867
2868 // This option inspects the machine and attempts to set various
2869 // parameters to be optimal for long-running, memory allocation
2870 // intensive jobs. It is intended for machines with large
2871 // amounts of cpu and memory.
2872
2873 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2874 // VM, but we may not be able to represent the total physical memory
2875 // available (like having 8gb of memory on a box but using a 32bit VM).
2876 // Thus, we need to make sure we're using a julong for intermediate
2877 // calculations.
2878 julong initHeapSize;
2879 julong total_memory = os::physical_memory();
2880
2881 if (total_memory < (julong)256*M) {
2882 jio_fprintf(defaultStream::error_stream(),
2883 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2884 vm_exit(1);
2885 }
2886
2887 // The heap size is half of available memory, or (at most)
2888 // all of possible memory less 160mb (leaving room for the OS
2889 // when using ISM). This is the maximum; because adaptive sizing
2890 // is turned on below, the actual space used may be smaller.
2891
2892 initHeapSize = MIN2(total_memory / (julong)2,
2893 total_memory - (julong)160*M);
2894
2895 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2896
2897 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2898 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2899 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2900 // Currently the minimum size and the initial heap sizes are the same.
2901 set_min_heap_size(initHeapSize);
2902 }
2903 if (FLAG_IS_DEFAULT(NewSize)) {
2904 // Make the young generation 3/8ths of the total heap.
2905 FLAG_SET_CMDLINE(uintx, NewSize,
2906 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2907 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2908 }
2909
2910 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2911 FLAG_SET_DEFAULT(UseLargePages, true);
2912 #endif
2913
2914 // Increase some data structure sizes for efficiency
2915 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2916 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2917 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2918
2919 // See the OldPLABSize comment below, but replace 'after promotion'
2920 // with 'after copying'. YoungPLABSize is the size of the survivor
2921 // space per-gc-thread buffers. The default is 4kw.
2922 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2923
2924 // OldPLABSize is the size of the buffers in the old gen that
2925 // UseParallelGC uses to promote live data that doesn't fit in the
2926 // survivor spaces. At any given time, there's one for each gc thread.
2927 // The default size is 1kw. These buffers are rarely used, since the
2928 // survivor spaces are usually big enough. For specjbb, however, there
2929 // are occasions when there's lots of live data in the young gen
2930 // and we end up promoting some of it. We don't have a definite
2931 // explanation for why bumping OldPLABSize helps, but the theory
2932 // is that a bigger PLAB results in retaining something like the
2933 // original allocation order after promotion, which improves mutator
2934 // locality. A minor effect may be that larger PLABs reduce the
2935 // number of PLAB allocation events during gc. The value of 8kw
2936 // was arrived at by experimenting with specjbb.
2937 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2938
2939 // Enable parallel GC and adaptive generation sizing
2940 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2941 FLAG_SET_DEFAULT(ParallelGCThreads,
2942 Abstract_VM_Version::parallel_worker_threads());
2943
2944 // Encourage steady state memory management
2945 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2946
2947 // This appears to improve mutator locality
2948 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2949
2950 // Get around early Solaris scheduling bug
2951 // (affinity vs other jobs on system)
2952 // but disallow DR and offlining (5008695).
2953 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2954
2955 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2956 // The last option must always win.
2957 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2958 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2959 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2960 // The last option must always win.
2961 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2962 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2963 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2964 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2965 jio_fprintf(defaultStream::error_stream(),
2966 "Please use CMSClassUnloadingEnabled in place of "
2967 "CMSPermGenSweepingEnabled in the future\n");
2968 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2969 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2970 jio_fprintf(defaultStream::error_stream(),
2971 "Please use -XX:+UseGCOverheadLimit in place of "
2972 "-XX:+UseGCTimeLimit in the future\n");
2973 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2974 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2975 jio_fprintf(defaultStream::error_stream(),
2976 "Please use -XX:-UseGCOverheadLimit in place of "
2977 "-XX:-UseGCTimeLimit in the future\n");
2978 // The TLE options are for compatibility with 1.3 and will be
2979 // removed without notice in a future release. These options
2980 // are not to be documented.
2981 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2982 // No longer used.
2983 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2984 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2985 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2986 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2987 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2988 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2989 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2990 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2991 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2992 // No longer used.
2993 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2994 julong long_tlab_size = 0;
2995 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2996 if (errcode != arg_in_range) {
2997 jio_fprintf(defaultStream::error_stream(),
2998 "Invalid TLAB size: %s\n", option->optionString);
2999 describe_range_error(errcode);
3000 return JNI_EINVAL;
3001 }
3002 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3003 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3004 // No longer used.
3005 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3006 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3007 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3008 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3009 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3010 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3011 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3012 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3013 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3014 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3015 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3016 #if defined(DTRACE_ENABLED)
3017 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3018 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3019 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3020 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3021 #else // defined(DTRACE_ENABLED)
3022 jio_fprintf(defaultStream::error_stream(),
3023 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3024 return JNI_EINVAL;
3025 #endif // defined(DTRACE_ENABLED)
3026 #ifdef ASSERT
3027 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3028 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3029 // disable scavenge before parallel mark-compact
3030 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3031 #endif
3032 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3033 julong cms_blocks_to_claim = (julong)atol(tail);
3034 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3035 jio_fprintf(defaultStream::error_stream(),
3036 "Please use -XX:OldPLABSize in place of "
3037 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3038 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3039 julong cms_blocks_to_claim = (julong)atol(tail);
3040 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3041 jio_fprintf(defaultStream::error_stream(),
3042 "Please use -XX:OldPLABSize in place of "
3043 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3044 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3045 julong old_plab_size = 0;
3046 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3047 if (errcode != arg_in_range) {
3048 jio_fprintf(defaultStream::error_stream(),
3049 "Invalid old PLAB size: %s\n", option->optionString);
3050 describe_range_error(errcode);
3051 return JNI_EINVAL;
3052 }
3053 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3054 jio_fprintf(defaultStream::error_stream(),
3055 "Please use -XX:OldPLABSize in place of "
3056 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3057 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3058 julong young_plab_size = 0;
3059 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3060 if (errcode != arg_in_range) {
3061 jio_fprintf(defaultStream::error_stream(),
3062 "Invalid young PLAB size: %s\n", option->optionString);
3063 describe_range_error(errcode);
3064 return JNI_EINVAL;
3065 }
3066 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3067 jio_fprintf(defaultStream::error_stream(),
3068 "Please use -XX:YoungPLABSize in place of "
3069 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3070 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3071 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3072 julong stack_size = 0;
3073 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3074 if (errcode != arg_in_range) {
3075 jio_fprintf(defaultStream::error_stream(),
3076 "Invalid mark stack size: %s\n", option->optionString);
3077 describe_range_error(errcode);
3078 return JNI_EINVAL;
3079 }
3080 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3081 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3082 julong max_stack_size = 0;
3083 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3084 if (errcode != arg_in_range) {
3085 jio_fprintf(defaultStream::error_stream(),
3086 "Invalid maximum mark stack size: %s\n",
3087 option->optionString);
3088 describe_range_error(errcode);
3089 return JNI_EINVAL;
3090 }
3091 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3092 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3093 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3094 uintx conc_threads = 0;
3095 if (!parse_uintx(tail, &conc_threads, 1)) {
3096 jio_fprintf(defaultStream::error_stream(),
3097 "Invalid concurrent threads: %s\n", option->optionString);
3098 return JNI_EINVAL;
3099 }
3100 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3101 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3102 julong max_direct_memory_size = 0;
3103 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3104 if (errcode != arg_in_range) {
3105 jio_fprintf(defaultStream::error_stream(),
3106 "Invalid maximum direct memory size: %s\n",
3107 option->optionString);
3108 describe_range_error(errcode);
3109 return JNI_EINVAL;
3110 }
3111 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3112 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3113 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3114 // away and will cause VM initialization failures!
3115 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3116 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3117 #if !INCLUDE_MANAGEMENT
3118 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3119 jio_fprintf(defaultStream::error_stream(),
3120 "ManagementServer is not supported in this VM.\n");
3121 return JNI_ERR;
3122 #endif // INCLUDE_MANAGEMENT
3123 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3124 // Skip -XX:Flags= since that case has already been handled
3125 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3126 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3127 return JNI_EINVAL;
3128 }
3129 }
3130 // Unknown option
3131 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3132 return JNI_ERR;
3133 }
3134 }
3135
3136 // Change the default value for flags which have different default values
3137 // when working with older JDKs.
3138 #ifdef LINUX
3139 if (JDK_Version::current().compare_major(6) <= 0 &&
3140 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3141 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3142 }
3143 #endif // LINUX
3144 return JNI_OK;
3145 }
3146
3147 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3148 // This must be done after all -D arguments have been processed.
3149 scp_p->expand_endorsed();
3150
3151 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3152 // Assemble the bootclasspath elements into the final path.
3153 Arguments::set_sysclasspath(scp_p->combined_path());
3154 }
3155
3156 // This must be done after all arguments have been processed.
3157 // java_compiler() true means set to "NONE" or empty.
3158 if (java_compiler() && !xdebug_mode()) {
3159 // For backwards compatibility, we switch to interpreted mode if
3160 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3161 // not specified.
3162 set_mode_flags(_int);
3163 }
3164 if (CompileThreshold == 0) {
3165 set_mode_flags(_int);
3166 }
3167
3168 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3169 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3170 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3171 }
3172
3173 #ifndef COMPILER2
3174 // Don't degrade server performance for footprint
3175 if (FLAG_IS_DEFAULT(UseLargePages) &&
3176 MaxHeapSize < LargePageHeapSizeThreshold) {
3177 // No need for large granularity pages w/small heaps.
3178 // Note that large pages are enabled/disabled for both the
3179 // Java heap and the code cache.
3180 FLAG_SET_DEFAULT(UseLargePages, false);
3181 }
3182
3183 #else
3184 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3185 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3186 }
3187 #endif
3188
3189 #ifndef TIERED
3190 // Tiered compilation is undefined.
3191 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3192 #endif
3193
3194 // If we are running in a headless jre, force java.awt.headless property
3195 // to be true unless the property has already been set.
3196 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3197 if (os::is_headless_jre()) {
3198 const char* headless = Arguments::get_property("java.awt.headless");
3199 if (headless == NULL) {
3200 char envbuffer[128];
3201 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3202 if (!add_property("java.awt.headless=true")) {
3203 return JNI_ENOMEM;
3204 }
3205 } else {
3206 char buffer[256];
3207 strcpy(buffer, "java.awt.headless=");
3208 strcat(buffer, envbuffer);
3209 if (!add_property(buffer)) {
3210 return JNI_ENOMEM;
3211 }
3212 }
3213 }
3214 }
3215
3216 if (!check_vm_args_consistency()) {
3217 return JNI_ERR;
3218 }
3219
3220 return JNI_OK;
3221 }
3222
3223 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3224 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3225 scp_assembly_required_p);
3226 }
3227
3228 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3229 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3230 scp_assembly_required_p);
3231 }
3232
3233 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3234 const int N_MAX_OPTIONS = 64;
3235 const int OPTION_BUFFER_SIZE = 1024;
3236 char buffer[OPTION_BUFFER_SIZE];
3237
3238 // The variable will be ignored if it exceeds the length of the buffer.
3239 // Don't check this variable if user has special privileges
3240 // (e.g. unix su command).
3241 if (os::getenv(name, buffer, sizeof(buffer)) &&
3242 !os::have_special_privileges()) {
3243 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3244 jio_fprintf(defaultStream::error_stream(),
3245 "Picked up %s: %s\n", name, buffer);
3246 char* rd = buffer; // pointer to the input string (rd)
3247 int i;
3248 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3249 while (isspace(*rd)) rd++; // skip whitespace
3250 if (*rd == 0) break; // we re done when the input string is read completely
3251
3252 // The output, option string, overwrites the input string.
3253 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3254 // input string (rd).
3255 char* wrt = rd;
3256
3257 options[i++].optionString = wrt; // Fill in option
3258 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3259 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3260 int quote = *rd; // matching quote to look for
3261 rd++; // don't copy open quote
3262 while (*rd != quote) { // include everything (even spaces) up until quote
3263 if (*rd == 0) { // string termination means unmatched string
3264 jio_fprintf(defaultStream::error_stream(),
3265 "Unmatched quote in %s\n", name);
3266 return JNI_ERR;
3267 }
3268 *wrt++ = *rd++; // copy to option string
3269 }
3270 rd++; // don't copy close quote
3271 } else {
3272 *wrt++ = *rd++; // copy to option string
3273 }
3274 }
3275 // Need to check if we're done before writing a NULL,
3276 // because the write could be to the byte that rd is pointing to.
3277 if (*rd++ == 0) {
3278 *wrt = 0;
3279 break;
3280 }
3281 *wrt = 0; // Zero terminate option
3282 }
3283 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3284 JavaVMInitArgs vm_args;
3285 vm_args.version = JNI_VERSION_1_2;
3286 vm_args.options = options;
3287 vm_args.nOptions = i;
3288 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3289
3290 if (PrintVMOptions) {
3291 const char* tail;
3292 for (int i = 0; i < vm_args.nOptions; i++) {
3293 const JavaVMOption *option = vm_args.options + i;
3294 if (match_option(option, "-XX:", &tail)) {
3295 logOption(tail);
3296 }
3297 }
3298 }
3299
3300 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
3301 }
3302 return JNI_OK;
3303 }
3304
3305 void Arguments::set_shared_spaces_flags() {
3306 if (DumpSharedSpaces) {
3307 if (RequireSharedSpaces) {
3308 warning("cannot dump shared archive while using shared archive");
3309 }
3310 UseSharedSpaces = false;
3311 #ifdef _LP64
3312 if (!UseCompressedOops || !UseCompressedClassPointers) {
3313 vm_exit_during_initialization(
3314 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3315 }
3316 } else {
3317 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3318 if (!UseCompressedOops || !UseCompressedClassPointers) {
3319 no_shared_spaces();
3320 }
3321 #endif
3322 }
3323 }
3324
3325 #if !INCLUDE_ALL_GCS
3326 static void force_serial_gc() {
3327 FLAG_SET_DEFAULT(UseSerialGC, true);
3328 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3329 UNSUPPORTED_GC_OPTION(UseG1GC);
3330 UNSUPPORTED_GC_OPTION(UseParallelGC);
3331 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3332 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3333 UNSUPPORTED_GC_OPTION(UseParNewGC);
3334 }
3335 #endif // INCLUDE_ALL_GCS
3336
3337 // Sharing support
3338 // Construct the path to the archive
3339 static char* get_shared_archive_path() {
3340 char *shared_archive_path;
3341 if (SharedArchiveFile == NULL) {
3342 char jvm_path[JVM_MAXPATHLEN];
3343 os::jvm_path(jvm_path, sizeof(jvm_path));
3344 char *end = strrchr(jvm_path, *os::file_separator());
3345 if (end != NULL) *end = '\0';
3346 size_t jvm_path_len = strlen(jvm_path);
3347 size_t file_sep_len = strlen(os::file_separator());
3348 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3349 file_sep_len + 20, mtInternal);
3350 if (shared_archive_path != NULL) {
3351 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3352 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3353 strncat(shared_archive_path, "classes.jsa", 11);
3354 }
3355 } else {
3356 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3357 if (shared_archive_path != NULL) {
3358 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3359 }
3360 }
3361 return shared_archive_path;
3362 }
3363
3364 // Parse entry point called from JNI_CreateJavaVM
3365
3366 jint Arguments::parse(const JavaVMInitArgs* args) {
3367
3368 // Remaining part of option string
3369 const char* tail;
3370
3371 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3372 const char* hotspotrc = ".hotspotrc";
3373 bool settings_file_specified = false;
3374 bool needs_hotspotrc_warning = false;
3375
3376 const char* flags_file;
3377 int index;
3378 for (index = 0; index < args->nOptions; index++) {
3379 const JavaVMOption *option = args->options + index;
3380 if (match_option(option, "-XX:Flags=", &tail)) {
3381 flags_file = tail;
3382 settings_file_specified = true;
3383 }
3384 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3385 PrintVMOptions = true;
3386 }
3387 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3388 PrintVMOptions = false;
3389 }
3390 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3391 IgnoreUnrecognizedVMOptions = true;
3392 }
3393 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3394 IgnoreUnrecognizedVMOptions = false;
3395 }
3396 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3397 CommandLineFlags::printFlags(tty, false);
3398 vm_exit(0);
3399 }
3400 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3401 #if INCLUDE_NMT
3402 MemTracker::init_tracking_options(tail);
3403 #else
3404 jio_fprintf(defaultStream::error_stream(),
3405 "Native Memory Tracking is not supported in this VM\n");
3406 return JNI_ERR;
3407 #endif
3408 }
3409
3410
3411 #ifndef PRODUCT
3412 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3413 CommandLineFlags::printFlags(tty, true);
3414 vm_exit(0);
3415 }
3416 #endif
3417 }
3418
3419 if (IgnoreUnrecognizedVMOptions) {
3420 // uncast const to modify the flag args->ignoreUnrecognized
3421 *(jboolean*)(&args->ignoreUnrecognized) = true;
3422 }
3423
3424 // Parse specified settings file
3425 if (settings_file_specified) {
3426 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3427 return JNI_EINVAL;
3428 }
3429 } else {
3430 #ifdef ASSERT
3431 // Parse default .hotspotrc settings file
3432 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3433 return JNI_EINVAL;
3434 }
3435 #else
3436 struct stat buf;
3437 if (os::stat(hotspotrc, &buf) == 0) {
3438 needs_hotspotrc_warning = true;
3439 }
3440 #endif
3441 }
3442
3443 if (PrintVMOptions) {
3444 for (index = 0; index < args->nOptions; index++) {
3445 const JavaVMOption *option = args->options + index;
3446 if (match_option(option, "-XX:", &tail)) {
3447 logOption(tail);
3448 }
3449 }
3450 }
3451
3452 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3453 jint result = parse_vm_init_args(args);
3454 if (result != JNI_OK) {
3455 return result;
3456 }
3457
3458 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3459 SharedArchivePath = get_shared_archive_path();
3460 if (SharedArchivePath == NULL) {
3461 return JNI_ENOMEM;
3462 }
3463
3464 // Delay warning until here so that we've had a chance to process
3465 // the -XX:-PrintWarnings flag
3466 if (needs_hotspotrc_warning) {
3467 warning("%s file is present but has been ignored. "
3468 "Run with -XX:Flags=%s to load the file.",
3469 hotspotrc, hotspotrc);
3470 }
3471
3472 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3473 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3474 #endif
3475
3476 #if INCLUDE_ALL_GCS
3477 #if (defined JAVASE_EMBEDDED || defined ARM)
3478 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3479 #endif
3480 #endif
3481
3482 #ifndef PRODUCT
3483 if (TraceBytecodesAt != 0) {
3484 TraceBytecodes = true;
3485 }
3486 if (CountCompiledCalls) {
3487 if (UseCounterDecay) {
3488 warning("UseCounterDecay disabled because CountCalls is set");
3489 UseCounterDecay = false;
3490 }
3491 }
3492 #endif // PRODUCT
3493
3494 // JSR 292 is not supported before 1.7
3495 if (!JDK_Version::is_gte_jdk17x_version()) {
3496 if (EnableInvokeDynamic) {
3497 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3498 warning("JSR 292 is not supported before 1.7. Disabling support.");
3499 }
3500 EnableInvokeDynamic = false;
3501 }
3502 }
3503
3504 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3505 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3506 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3507 }
3508 ScavengeRootsInCode = 1;
3509 }
3510
3511 if (PrintGCDetails) {
3512 // Turn on -verbose:gc options as well
3513 PrintGC = true;
3514 }
3515
3516 if (!JDK_Version::is_gte_jdk18x_version()) {
3517 // To avoid changing the log format for 7 updates this flag is only
3518 // true by default in JDK8 and above.
3519 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3520 FLAG_SET_DEFAULT(PrintGCCause, false);
3521 }
3522 }
3523
3524 // Set object alignment values.
3525 set_object_alignment();
3526
3527 #if !INCLUDE_ALL_GCS
3528 force_serial_gc();
3529 #endif // INCLUDE_ALL_GCS
3530 #if !INCLUDE_CDS
3531 if (DumpSharedSpaces || RequireSharedSpaces) {
3532 jio_fprintf(defaultStream::error_stream(),
3533 "Shared spaces are not supported in this VM\n");
3534 return JNI_ERR;
3535 }
3536 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3537 warning("Shared spaces are not supported in this VM");
3538 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3539 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3540 }
3541 no_shared_spaces();
3542 #endif // INCLUDE_CDS
3543
3544 return JNI_OK;
3545 }
3546
3547 jint Arguments::apply_ergo() {
3548
3549 // Set flags based on ergonomics.
3550 set_ergonomics_flags();
3551
3552 set_shared_spaces_flags();
3553
3554 // Check the GC selections again.
3555 if (!check_gc_consistency()) {
3556 return JNI_EINVAL;
3557 }
3558
3559 if (TieredCompilation) {
3560 set_tiered_flags();
3561 } else {
3562 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3563 if (CompilationPolicyChoice >= 2) {
3564 vm_exit_during_initialization(
3565 "Incompatible compilation policy selected", NULL);
3566 }
3567 }
3568
3569 // Set heap size based on available physical memory
3570 set_heap_size();
3571
3572 #if INCLUDE_ALL_GCS
3573 // Set per-collector flags
3574 if (UseParallelGC || UseParallelOldGC) {
3575 set_parallel_gc_flags();
3576 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3577 set_cms_and_parnew_gc_flags();
3578 } else if (UseParNewGC) { // skipped if CMS is set above
3579 set_parnew_gc_flags();
3580 } else if (UseG1GC) {
3581 set_g1_gc_flags();
3582 }
3583 check_deprecated_gcs();
3584 check_deprecated_gc_flags();
3585 if (AssumeMP && !UseSerialGC) {
3586 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3587 warning("If the number of processors is expected to increase from one, then"
3588 " you should configure the number of parallel GC threads appropriately"
3589 " using -XX:ParallelGCThreads=N");
3590 }
3591 }
3592 #else // INCLUDE_ALL_GCS
3593 assert(verify_serial_gc_flags(), "SerialGC unset");
3594 #endif // INCLUDE_ALL_GCS
3595
3596 // Set bytecode rewriting flags
3597 set_bytecode_flags();
3598
3599 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3600 set_aggressive_opts_flags();
3601
3602 // Turn off biased locking for locking debug mode flags,
3603 // which are subtlely different from each other but neither works with
3604 // biased locking.
3605 if (UseHeavyMonitors
3606 #ifdef COMPILER1
3607 || !UseFastLocking
3608 #endif // COMPILER1
3609 ) {
3610 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3611 // flag set to true on command line; warn the user that they
3612 // can't enable biased locking here
3613 warning("Biased Locking is not supported with locking debug flags"
3614 "; ignoring UseBiasedLocking flag." );
3615 }
3616 UseBiasedLocking = false;
3617 }
3618
3619 #ifdef CC_INTERP
3620 // Clear flags not supported by the C++ interpreter
3621 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3622 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3623 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3624 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3625 #endif // CC_INTERP
3626
3627 #ifdef COMPILER2
3628 if (!UseBiasedLocking || EmitSync != 0) {
3629 UseOptoBiasInlining = false;
3630 }
3631 if (!EliminateLocks) {
3632 EliminateNestedLocks = false;
3633 }
3634 if (!Inline) {
3635 IncrementalInline = false;
3636 }
3637 #ifndef PRODUCT
3638 if (!IncrementalInline) {
3639 AlwaysIncrementalInline = false;
3640 }
3641 #endif
3642 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3643 // incremental inlining: bump MaxNodeLimit
3644 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3645 }
3646 #endif
3647
3648 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3649 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3650 DebugNonSafepoints = true;
3651 }
3652
3653 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3654 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3655 }
3656
3657 #ifndef PRODUCT
3658 if (CompileTheWorld) {
3659 // Force NmethodSweeper to sweep whole CodeCache each time.
3660 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3661 NmethodSweepFraction = 1;
3662 }
3663 }
3664 #endif
3665
3666 if (PrintCommandLineFlags) {
3667 CommandLineFlags::printSetFlags(tty);
3668 }
3669
3670 // Apply CPU specific policy for the BiasedLocking
3671 if (UseBiasedLocking) {
3672 if (!VM_Version::use_biased_locking() &&
3673 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3674 UseBiasedLocking = false;
3675 }
3676 }
3677
3678 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3679 // but only if not already set on the commandline
3680 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3681 bool set = false;
3682 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3683 if (!set) {
3684 FLAG_SET_DEFAULT(PauseAtExit, true);
3685 }
3686 }
3687
3688 return JNI_OK;
3689 }
3690
3691 jint Arguments::adjust_after_os() {
3692 #if INCLUDE_ALL_GCS
3693 if (UseParallelGC || UseParallelOldGC) {
3694 if (UseNUMA) {
3695 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3696 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3697 }
3698 // For those collectors or operating systems (eg, Windows) that do
3699 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3700 UseNUMAInterleaving = true;
3701 }
3702 }
3703 #endif // INCLUDE_ALL_GCS
3704 return JNI_OK;
3705 }
3706
3707 int Arguments::PropertyList_count(SystemProperty* pl) {
3708 int count = 0;
3709 while(pl != NULL) {
3710 count++;
3711 pl = pl->next();
3712 }
3713 return count;
3714 }
3715
3716 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3717 assert(key != NULL, "just checking");
3718 SystemProperty* prop;
3719 for (prop = pl; prop != NULL; prop = prop->next()) {
3720 if (strcmp(key, prop->key()) == 0) return prop->value();
3721 }
3722 return NULL;
3723 }
3724
3725 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3726 int count = 0;
3727 const char* ret_val = NULL;
3728
3729 while(pl != NULL) {
3730 if(count >= index) {
3731 ret_val = pl->key();
3732 break;
3733 }
3734 count++;
3735 pl = pl->next();
3736 }
3737
3738 return ret_val;
3739 }
3740
3741 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3742 int count = 0;
3743 char* ret_val = NULL;
3744
3745 while(pl != NULL) {
3746 if(count >= index) {
3747 ret_val = pl->value();
3748 break;
3749 }
3750 count++;
3751 pl = pl->next();
3752 }
3753
3754 return ret_val;
3755 }
3756
3757 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3758 SystemProperty* p = *plist;
3759 if (p == NULL) {
3760 *plist = new_p;
3761 } else {
3762 while (p->next() != NULL) {
3763 p = p->next();
3764 }
3765 p->set_next(new_p);
3766 }
3767 }
3768
3769 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3770 if (plist == NULL)
3771 return;
3772
3773 SystemProperty* new_p = new SystemProperty(k, v, true);
3774 PropertyList_add(plist, new_p);
3775 }
3776
3777 // This add maintains unique property key in the list.
3778 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3779 if (plist == NULL)
3780 return;
3781
3782 // If property key exist then update with new value.
3783 SystemProperty* prop;
3784 for (prop = *plist; prop != NULL; prop = prop->next()) {
3785 if (strcmp(k, prop->key()) == 0) {
3786 if (append) {
3787 prop->append_value(v);
3788 } else {
3789 prop->set_value(v);
3790 }
3791 return;
3792 }
3793 }
3794
3795 PropertyList_add(plist, k, v);
3796 }
3797
3798 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3799 // Returns true if all of the source pointed by src has been copied over to
3800 // the destination buffer pointed by buf. Otherwise, returns false.
3801 // Notes:
3802 // 1. If the length (buflen) of the destination buffer excluding the
3803 // NULL terminator character is not long enough for holding the expanded
3804 // pid characters, it also returns false instead of returning the partially
3805 // expanded one.
3806 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3807 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3808 char* buf, size_t buflen) {
3809 const char* p = src;
3810 char* b = buf;
3811 const char* src_end = &src[srclen];
3812 char* buf_end = &buf[buflen - 1];
3813
3814 while (p < src_end && b < buf_end) {
3815 if (*p == '%') {
3816 switch (*(++p)) {
3817 case '%': // "%%" ==> "%"
3818 *b++ = *p++;
3819 break;
3820 case 'p': { // "%p" ==> current process id
3821 // buf_end points to the character before the last character so
3822 // that we could write '\0' to the end of the buffer.
3823 size_t buf_sz = buf_end - b + 1;
3824 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3825
3826 // if jio_snprintf fails or the buffer is not long enough to hold
3827 // the expanded pid, returns false.
3828 if (ret < 0 || ret >= (int)buf_sz) {
3829 return false;
3830 } else {
3831 b += ret;
3832 assert(*b == '\0', "fail in copy_expand_pid");
3833 if (p == src_end && b == buf_end + 1) {
3834 // reach the end of the buffer.
3835 return true;
3836 }
3837 }
3838 p++;
3839 break;
3840 }
3841 default :
3842 *b++ = '%';
3843 }
3844 } else {
3845 *b++ = *p++;
3846 }
3847 }
3848 *b = '\0';
3849 return (p == src_end); // return false if not all of the source was copied
3850 }