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, Flag::Flags origin) {
629 return CommandLineFlags::boolAtPut(name, &value, origin);
630 }
631
632 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags 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, Flag::Flags 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, Flag::Flags 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, Flag::Flags 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, Flag::Flags 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, Flag::Flags 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, Flag::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, Flag::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 situtation 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 Arguments::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>[k|K|m|M|g|G]\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 // This function is called for -Xloggc:<filename>, it can be used
1887 // to check if a given file name(or string) conforms to the following
1888 // specification:
1889 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1890 // %p and %t only allowed once. We only limit usage of filename not path
1891 bool is_filename_valid(const char *file_name) {
1892 const char* p = file_name;
1893 char file_sep = os::file_separator()[0];
1894 const char* cp;
1895 // skip prefix path
1896 for (cp = file_name; *cp != '\0'; cp++) {
1897 if (*cp == '/' || *cp == file_sep) {
1898 p = cp + 1;
1899 }
1900 }
1901
1902 int count_p = 0;
1903 int count_t = 0;
1904 while (*p != '\0') {
1905 if ((*p >= '0' && *p <= '9') ||
1906 (*p >= 'A' && *p <= 'Z') ||
1907 (*p >= 'a' && *p <= 'z') ||
1908 *p == '-' ||
1909 *p == '_' ||
1910 *p == '.') {
1911 p++;
1912 continue;
1913 }
1914 if (*p == '%') {
1915 if(*(p + 1) == 'p') {
1916 p += 2;
1917 count_p ++;
1918 continue;
1919 }
1920 if (*(p + 1) == 't') {
1921 p += 2;
1922 count_t ++;
1923 continue;
1924 }
1925 }
1926 return false;
1927 }
1928 return count_p < 2 && count_t < 2;
1929 }
1930
1931 // Check consistency of GC selection
1932 bool Arguments::check_gc_consistency() {
1933 check_gclog_consistency();
1934 bool status = true;
1935 // Ensure that the user has not selected conflicting sets
1936 // of collectors. [Note: this check is merely a user convenience;
1937 // collectors over-ride each other so that only a non-conflicting
1938 // set is selected; however what the user gets is not what they
1939 // may have expected from the combination they asked for. It's
1940 // better to reduce user confusion by not allowing them to
1941 // select conflicting combinations.
1942 uint i = 0;
1943 if (UseSerialGC) i++;
1944 if (UseConcMarkSweepGC || UseParNewGC) i++;
1945 if (UseParallelGC || UseParallelOldGC) i++;
1946 if (UseG1GC) i++;
1947 if (i > 1) {
1948 jio_fprintf(defaultStream::error_stream(),
1949 "Conflicting collector combinations in option list; "
1950 "please refer to the release notes for the combinations "
1951 "allowed\n");
1952 status = false;
1953 } else if (ReservedCodeCacheSize > 2*G) {
1954 // Code cache size larger than MAXINT is not supported.
1955 jio_fprintf(defaultStream::error_stream(),
1956 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
1957 (2*G)/M);
1958 status = false;
1959 }
1960 return status;
1961 }
1962
1963 void Arguments::check_deprecated_gcs() {
1964 if (UseConcMarkSweepGC && !UseParNewGC) {
1965 warning("Using the DefNew young collector with the CMS collector is deprecated "
1966 "and will likely be removed in a future release");
1967 }
1968
1969 if (UseParNewGC && !UseConcMarkSweepGC) {
1970 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1971 // set up UseSerialGC properly, so that can't be used in the check here.
1972 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1973 "and will likely be removed in a future release");
1974 }
1975
1976 if (CMSIncrementalMode) {
1977 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1978 }
1979 }
1980
1981 void Arguments::check_deprecated_gc_flags() {
1982 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
1983 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
1984 "and will likely be removed in future release");
1985 }
1986 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
1987 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
1988 "Use MaxRAMFraction instead.");
1989 }
1990 }
1991
1992 // Check stack pages settings
1993 bool Arguments::check_stack_pages()
1994 {
1995 bool status = true;
1996 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1997 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1998 // greater stack shadow pages can't generate instruction to bang stack
1999 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2000 return status;
2001 }
2002
2003 // Check the consistency of vm_init_args
2004 bool Arguments::check_vm_args_consistency() {
2005 // Method for adding checks for flag consistency.
2006 // The intent is to warn the user of all possible conflicts,
2007 // before returning an error.
2008 // Note: Needs platform-dependent factoring.
2009 bool status = true;
2010
2011 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2012 // builds so the cost of stack banging can be measured.
2013 #if (defined(PRODUCT) && defined(SOLARIS))
2014 if (!UseBoundThreads && !UseStackBanging) {
2015 jio_fprintf(defaultStream::error_stream(),
2016 "-UseStackBanging conflicts with -UseBoundThreads\n");
2017
2018 status = false;
2019 }
2020 #endif
2021
2022 if (TLABRefillWasteFraction == 0) {
2023 jio_fprintf(defaultStream::error_stream(),
2024 "TLABRefillWasteFraction should be a denominator, "
2025 "not " SIZE_FORMAT "\n",
2026 TLABRefillWasteFraction);
2027 status = false;
2028 }
2029
2030 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2031 "AdaptiveSizePolicyWeight");
2032 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2033 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
2034 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
2035
2036 // Divide by bucket size to prevent a large size from causing rollover when
2037 // calculating amount of memory needed to be allocated for the String table.
2038 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2039 (max_uintx / StringTable::bucket_size()), "StringTable size");
2040
2041 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
2042 jio_fprintf(defaultStream::error_stream(),
2043 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2044 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
2045 MinHeapFreeRatio, MaxHeapFreeRatio);
2046 status = false;
2047 }
2048 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2049 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
2050
2051 // Min/MaxMetaspaceFreeRatio
2052 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2053 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2054
2055 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2056 jio_fprintf(defaultStream::error_stream(),
2057 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2058 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2059 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2060 MinMetaspaceFreeRatio,
2061 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2062 MaxMetaspaceFreeRatio);
2063 status = false;
2064 }
2065
2066 // Trying to keep 100% free is not practical
2067 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2068
2069 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2070 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2071 }
2072
2073 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2074 // Settings to encourage splitting.
2075 if (!FLAG_IS_CMDLINE(NewRatio)) {
2076 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2077 }
2078 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2079 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2080 }
2081 }
2082
2083 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2084 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2085 if (GCTimeLimit == 100) {
2086 // Turn off gc-overhead-limit-exceeded checks
2087 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2088 }
2089
2090 status = status && check_gc_consistency();
2091 status = status && check_stack_pages();
2092
2093 if (CMSIncrementalMode) {
2094 if (!UseConcMarkSweepGC) {
2095 jio_fprintf(defaultStream::error_stream(),
2096 "error: invalid argument combination.\n"
2097 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2098 "selected in order\nto use CMSIncrementalMode.\n");
2099 status = false;
2100 } else {
2101 status = status && verify_percentage(CMSIncrementalDutyCycle,
2102 "CMSIncrementalDutyCycle");
2103 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2104 "CMSIncrementalDutyCycleMin");
2105 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2106 "CMSIncrementalSafetyFactor");
2107 status = status && verify_percentage(CMSIncrementalOffset,
2108 "CMSIncrementalOffset");
2109 status = status && verify_percentage(CMSExpAvgFactor,
2110 "CMSExpAvgFactor");
2111 // If it was not set on the command line, set
2112 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2113 if (CMSInitiatingOccupancyFraction < 0) {
2114 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2115 }
2116 }
2117 }
2118
2119 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2120 // insists that we hold the requisite locks so that the iteration is
2121 // MT-safe. For the verification at start-up and shut-down, we don't
2122 // yet have a good way of acquiring and releasing these locks,
2123 // which are not visible at the CollectedHeap level. We want to
2124 // be able to acquire these locks and then do the iteration rather
2125 // than just disable the lock verification. This will be fixed under
2126 // bug 4788986.
2127 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2128 if (VerifyDuringStartup) {
2129 warning("Heap verification at start-up disabled "
2130 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2131 VerifyDuringStartup = false; // Disable verification at start-up
2132 }
2133
2134 if (VerifyBeforeExit) {
2135 warning("Heap verification at shutdown disabled "
2136 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2137 VerifyBeforeExit = false; // Disable verification at shutdown
2138 }
2139 }
2140
2141 // Note: only executed in non-PRODUCT mode
2142 if (!UseAsyncConcMarkSweepGC &&
2143 (ExplicitGCInvokesConcurrent ||
2144 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2145 jio_fprintf(defaultStream::error_stream(),
2146 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2147 " with -UseAsyncConcMarkSweepGC");
2148 status = false;
2149 }
2150
2151 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2152
2153 #if INCLUDE_ALL_GCS
2154 if (UseG1GC) {
2155 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2156 "InitiatingHeapOccupancyPercent");
2157 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2158 "G1RefProcDrainInterval");
2159 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2160 "G1ConcMarkStepDurationMillis");
2161 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2162 "G1ConcRSHotCardLimit");
2163 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2164 "G1ConcRSLogCacheSize");
2165 }
2166 if (UseConcMarkSweepGC) {
2167 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2168 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2169 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2170 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2171
2172 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2173
2174 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2175 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2176 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2177
2178 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2179
2180 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2181 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2182
2183 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2184 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2185 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2186
2187 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2188
2189 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2190
2191 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2192 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2193 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2194 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2195 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2196 }
2197
2198 if (UseParallelGC || UseParallelOldGC) {
2199 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2200 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2201
2202 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2203 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2204
2205 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2206 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2207
2208 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2209
2210 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2211 }
2212 #endif // INCLUDE_ALL_GCS
2213
2214 status = status && verify_interval(RefDiscoveryPolicy,
2215 ReferenceProcessor::DiscoveryPolicyMin,
2216 ReferenceProcessor::DiscoveryPolicyMax,
2217 "RefDiscoveryPolicy");
2218
2219 // Limit the lower bound of this flag to 1 as it is used in a division
2220 // expression.
2221 status = status && verify_interval(TLABWasteTargetPercent,
2222 1, 100, "TLABWasteTargetPercent");
2223
2224 status = status && verify_object_alignment();
2225
2226 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2227 "CompressedClassSpaceSize");
2228
2229 status = status && verify_interval(MarkStackSizeMax,
2230 1, (max_jint - 1), "MarkStackSizeMax");
2231 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2232
2233 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2234
2235 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2236
2237 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2238
2239 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2240 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2241
2242 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2243
2244 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2245 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2246 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2247 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2248
2249 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2250 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2251
2252 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2253 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2254 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2255
2256 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2257 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2258
2259 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2260 // just for that, so hardcode here.
2261 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2262 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2263 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2264 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2265
2266 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2267 #ifdef SPARC
2268 if (UseConcMarkSweepGC || UseG1GC) {
2269 // Issue a stern warning if the user has explicitly set
2270 // UseMemSetInBOT (it is known to cause issues), but allow
2271 // use for experimentation and debugging.
2272 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2273 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2274 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2275 " on sun4v; please understand that you are using at your own risk!");
2276 }
2277 }
2278 #endif // SPARC
2279
2280 if (PrintNMTStatistics) {
2281 #if INCLUDE_NMT
2282 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2283 #endif // INCLUDE_NMT
2284 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2285 PrintNMTStatistics = false;
2286 #if INCLUDE_NMT
2287 }
2288 #endif
2289 }
2290
2291 // Need to limit the extent of the padding to reasonable size.
2292 // 8K is well beyond the reasonable HW cache line size, even with the
2293 // aggressive prefetching, while still leaving the room for segregating
2294 // among the distinct pages.
2295 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2296 jio_fprintf(defaultStream::error_stream(),
2297 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2298 ContendedPaddingWidth, 0, 8192);
2299 status = false;
2300 }
2301
2302 // Need to enforce the padding not to break the existing field alignments.
2303 // It is sufficient to check against the largest type size.
2304 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2305 jio_fprintf(defaultStream::error_stream(),
2306 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2307 ContendedPaddingWidth, BytesPerLong);
2308 status = false;
2309 }
2310
2311 // Check lower bounds of the code cache
2312 // Template Interpreter code is approximately 3X larger in debug builds.
2313 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2314 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2315 jio_fprintf(defaultStream::error_stream(),
2316 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2317 os::vm_page_size()/K);
2318 status = false;
2319 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2320 jio_fprintf(defaultStream::error_stream(),
2321 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2322 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2323 status = false;
2324 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2325 jio_fprintf(defaultStream::error_stream(),
2326 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2327 min_code_cache_size/K);
2328 status = false;
2329 } else if (ReservedCodeCacheSize > 2*G) {
2330 // Code cache size larger than MAXINT is not supported.
2331 jio_fprintf(defaultStream::error_stream(),
2332 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2333 (2*G)/M);
2334 status = false;
2335 }
2336 return status;
2337 }
2338
2339 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2340 const char* option_type) {
2341 if (ignore) return false;
2342
2343 const char* spacer = " ";
2344 if (option_type == NULL) {
2345 option_type = ++spacer; // Set both to the empty string.
2346 }
2347
2348 if (os::obsolete_option(option)) {
2349 jio_fprintf(defaultStream::error_stream(),
2350 "Obsolete %s%soption: %s\n", option_type, spacer,
2351 option->optionString);
2352 return false;
2353 } else {
2354 jio_fprintf(defaultStream::error_stream(),
2355 "Unrecognized %s%soption: %s\n", option_type, spacer,
2356 option->optionString);
2357 return true;
2358 }
2359 }
2360
2361 static const char* user_assertion_options[] = {
2362 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2363 };
2364
2365 static const char* system_assertion_options[] = {
2366 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2367 };
2368
2369 // Return true if any of the strings in null-terminated array 'names' matches.
2370 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2371 // the option must match exactly.
2372 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2373 bool tail_allowed) {
2374 for (/* empty */; *names != NULL; ++names) {
2375 if (match_option(option, *names, tail)) {
2376 if (**tail == '\0' || tail_allowed && **tail == ':') {
2377 return true;
2378 }
2379 }
2380 }
2381 return false;
2382 }
2383
2384 bool Arguments::parse_uintx(const char* value,
2385 uintx* uintx_arg,
2386 uintx min_size) {
2387
2388 // Check the sign first since atomull() parses only unsigned values.
2389 bool value_is_positive = !(*value == '-');
2390
2391 if (value_is_positive) {
2392 julong n;
2393 bool good_return = atomull(value, &n);
2394 if (good_return) {
2395 bool above_minimum = n >= min_size;
2396 bool value_is_too_large = n > max_uintx;
2397
2398 if (above_minimum && !value_is_too_large) {
2399 *uintx_arg = n;
2400 return true;
2401 }
2402 }
2403 }
2404 return false;
2405 }
2406
2407 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2408 julong* long_arg,
2409 julong min_size) {
2410 if (!atomull(s, long_arg)) return arg_unreadable;
2411 return check_memory_size(*long_arg, min_size);
2412 }
2413
2414 // Parse JavaVMInitArgs structure
2415
2416 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2417 // For components of the system classpath.
2418 SysClassPath scp(Arguments::get_sysclasspath());
2419 bool scp_assembly_required = false;
2420
2421 // Save default settings for some mode flags
2422 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2423 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2424 Arguments::_ClipInlining = ClipInlining;
2425 Arguments::_BackgroundCompilation = BackgroundCompilation;
2426
2427 // Setup flags for mixed which is the default
2428 set_mode_flags(_mixed);
2429
2430 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2431 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2432 if (result != JNI_OK) {
2433 return result;
2434 }
2435
2436 // Parse JavaVMInitArgs structure passed in
2437 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2438 if (result != JNI_OK) {
2439 return result;
2440 }
2441
2442 if (AggressiveOpts) {
2443 // Insert alt-rt.jar between user-specified bootclasspath
2444 // prefix and the default bootclasspath. os::set_boot_path()
2445 // uses meta_index_dir as the default bootclasspath directory.
2446 const char* altclasses_jar = "alt-rt.jar";
2447 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2448 strlen(altclasses_jar);
2449 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2450 strcpy(altclasses_path, get_meta_index_dir());
2451 strcat(altclasses_path, altclasses_jar);
2452 scp.add_suffix_to_prefix(altclasses_path);
2453 scp_assembly_required = true;
2454 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2455 }
2456
2457 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2458 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2459 if (result != JNI_OK) {
2460 return result;
2461 }
2462
2463 // Do final processing now that all arguments have been parsed
2464 result = finalize_vm_init_args(&scp, scp_assembly_required);
2465 if (result != JNI_OK) {
2466 return result;
2467 }
2468
2469 return JNI_OK;
2470 }
2471
2472 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2473 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2474 // are dealing with -agentpath (case where name is a path), otherwise with
2475 // -agentlib
2476 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2477 char *_name;
2478 const char *_hprof = "hprof", *_jdwp = "jdwp";
2479 size_t _len_hprof, _len_jdwp, _len_prefix;
2480
2481 if (is_path) {
2482 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2483 return false;
2484 }
2485
2486 _name++; // skip past last path separator
2487 _len_prefix = strlen(JNI_LIB_PREFIX);
2488
2489 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2490 return false;
2491 }
2492
2493 _name += _len_prefix;
2494 _len_hprof = strlen(_hprof);
2495 _len_jdwp = strlen(_jdwp);
2496
2497 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2498 _name += _len_hprof;
2499 }
2500 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2501 _name += _len_jdwp;
2502 }
2503 else {
2504 return false;
2505 }
2506
2507 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2508 return false;
2509 }
2510
2511 return true;
2512 }
2513
2514 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2515 return true;
2516 }
2517
2518 return false;
2519 }
2520
2521 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2522 SysClassPath* scp_p,
2523 bool* scp_assembly_required_p,
2524 Flag::Flags origin) {
2525 // Remaining part of option string
2526 const char* tail;
2527
2528 // iterate over arguments
2529 for (int index = 0; index < args->nOptions; index++) {
2530 bool is_absolute_path = false; // for -agentpath vs -agentlib
2531
2532 const JavaVMOption* option = args->options + index;
2533
2534 if (!match_option(option, "-Djava.class.path", &tail) &&
2535 !match_option(option, "-Dsun.java.command", &tail) &&
2536 !match_option(option, "-Dsun.java.launcher", &tail)) {
2537
2538 // add all jvm options to the jvm_args string. This string
2539 // is used later to set the java.vm.args PerfData string constant.
2540 // the -Djava.class.path and the -Dsun.java.command options are
2541 // omitted from jvm_args string as each have their own PerfData
2542 // string constant object.
2543 build_jvm_args(option->optionString);
2544 }
2545
2546 // -verbose:[class/gc/jni]
2547 if (match_option(option, "-verbose", &tail)) {
2548 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2549 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2550 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2551 } else if (!strcmp(tail, ":gc")) {
2552 FLAG_SET_CMDLINE(bool, PrintGC, true);
2553 } else if (!strcmp(tail, ":jni")) {
2554 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2555 }
2556 // -da / -ea / -disableassertions / -enableassertions
2557 // These accept an optional class/package name separated by a colon, e.g.,
2558 // -da:java.lang.Thread.
2559 } else if (match_option(option, user_assertion_options, &tail, true)) {
2560 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2561 if (*tail == '\0') {
2562 JavaAssertions::setUserClassDefault(enable);
2563 } else {
2564 assert(*tail == ':', "bogus match by match_option()");
2565 JavaAssertions::addOption(tail + 1, enable);
2566 }
2567 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2568 } else if (match_option(option, system_assertion_options, &tail, false)) {
2569 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2570 JavaAssertions::setSystemClassDefault(enable);
2571 // -bootclasspath:
2572 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2573 scp_p->reset_path(tail);
2574 *scp_assembly_required_p = true;
2575 // -bootclasspath/a:
2576 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2577 scp_p->add_suffix(tail);
2578 *scp_assembly_required_p = true;
2579 // -bootclasspath/p:
2580 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2581 scp_p->add_prefix(tail);
2582 *scp_assembly_required_p = true;
2583 // -Xrun
2584 } else if (match_option(option, "-Xrun", &tail)) {
2585 if (tail != NULL) {
2586 const char* pos = strchr(tail, ':');
2587 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2588 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2589 name[len] = '\0';
2590
2591 char *options = NULL;
2592 if(pos != NULL) {
2593 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2594 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2595 }
2596 #if !INCLUDE_JVMTI
2597 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2598 jio_fprintf(defaultStream::error_stream(),
2599 "Profiling and debugging agents are not supported in this VM\n");
2600 return JNI_ERR;
2601 }
2602 #endif // !INCLUDE_JVMTI
2603 add_init_library(name, options);
2604 }
2605 // -agentlib and -agentpath
2606 } else if (match_option(option, "-agentlib:", &tail) ||
2607 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2608 if(tail != NULL) {
2609 const char* pos = strchr(tail, '=');
2610 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2611 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2612 name[len] = '\0';
2613
2614 char *options = NULL;
2615 if(pos != NULL) {
2616 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2617 }
2618 #if !INCLUDE_JVMTI
2619 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2620 jio_fprintf(defaultStream::error_stream(),
2621 "Profiling and debugging agents are not supported in this VM\n");
2622 return JNI_ERR;
2623 }
2624 #endif // !INCLUDE_JVMTI
2625 add_init_agent(name, options, is_absolute_path);
2626 }
2627 // -javaagent
2628 } else if (match_option(option, "-javaagent:", &tail)) {
2629 #if !INCLUDE_JVMTI
2630 jio_fprintf(defaultStream::error_stream(),
2631 "Instrumentation agents are not supported in this VM\n");
2632 return JNI_ERR;
2633 #else
2634 if(tail != NULL) {
2635 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2636 add_init_agent("instrument", options, false);
2637 }
2638 #endif // !INCLUDE_JVMTI
2639 // -Xnoclassgc
2640 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2641 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2642 // -Xincgc: i-CMS
2643 } else if (match_option(option, "-Xincgc", &tail)) {
2644 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2645 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2646 // -Xnoincgc: no i-CMS
2647 } else if (match_option(option, "-Xnoincgc", &tail)) {
2648 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2649 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2650 // -Xconcgc
2651 } else if (match_option(option, "-Xconcgc", &tail)) {
2652 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2653 // -Xnoconcgc
2654 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2655 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2656 // -Xbatch
2657 } else if (match_option(option, "-Xbatch", &tail)) {
2658 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2659 // -Xmn for compatibility with other JVM vendors
2660 } else if (match_option(option, "-Xmn", &tail)) {
2661 julong long_initial_eden_size = 0;
2662 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2663 if (errcode != arg_in_range) {
2664 jio_fprintf(defaultStream::error_stream(),
2665 "Invalid initial eden size: %s\n", option->optionString);
2666 describe_range_error(errcode);
2667 return JNI_EINVAL;
2668 }
2669 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2670 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2671 // -Xms
2672 } else if (match_option(option, "-Xms", &tail)) {
2673 julong long_initial_heap_size = 0;
2674 // an initial heap size of 0 means automatically determine
2675 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2676 if (errcode != arg_in_range) {
2677 jio_fprintf(defaultStream::error_stream(),
2678 "Invalid initial heap size: %s\n", option->optionString);
2679 describe_range_error(errcode);
2680 return JNI_EINVAL;
2681 }
2682 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2683 // Currently the minimum size and the initial heap sizes are the same.
2684 set_min_heap_size(InitialHeapSize);
2685 // -Xmx
2686 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2687 julong long_max_heap_size = 0;
2688 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2689 if (errcode != arg_in_range) {
2690 jio_fprintf(defaultStream::error_stream(),
2691 "Invalid maximum heap size: %s\n", option->optionString);
2692 describe_range_error(errcode);
2693 return JNI_EINVAL;
2694 }
2695 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2696 // Xmaxf
2697 } else if (match_option(option, "-Xmaxf", &tail)) {
2698 int maxf = (int)(atof(tail) * 100);
2699 if (maxf < 0 || maxf > 100) {
2700 jio_fprintf(defaultStream::error_stream(),
2701 "Bad max heap free percentage size: %s\n",
2702 option->optionString);
2703 return JNI_EINVAL;
2704 } else {
2705 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2706 }
2707 // Xminf
2708 } else if (match_option(option, "-Xminf", &tail)) {
2709 int minf = (int)(atof(tail) * 100);
2710 if (minf < 0 || minf > 100) {
2711 jio_fprintf(defaultStream::error_stream(),
2712 "Bad min heap free percentage size: %s\n",
2713 option->optionString);
2714 return JNI_EINVAL;
2715 } else {
2716 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2717 }
2718 // -Xss
2719 } else if (match_option(option, "-Xss", &tail)) {
2720 julong long_ThreadStackSize = 0;
2721 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2722 if (errcode != arg_in_range) {
2723 jio_fprintf(defaultStream::error_stream(),
2724 "Invalid thread stack size: %s\n", option->optionString);
2725 describe_range_error(errcode);
2726 return JNI_EINVAL;
2727 }
2728 // Internally track ThreadStackSize in units of 1024 bytes.
2729 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2730 round_to((int)long_ThreadStackSize, K) / K);
2731 // -Xoss
2732 } else if (match_option(option, "-Xoss", &tail)) {
2733 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2734 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2735 julong long_CodeCacheExpansionSize = 0;
2736 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2737 if (errcode != arg_in_range) {
2738 jio_fprintf(defaultStream::error_stream(),
2739 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2740 os::vm_page_size()/K);
2741 return JNI_EINVAL;
2742 }
2743 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2744 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2745 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2746 julong long_ReservedCodeCacheSize = 0;
2747
2748 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2749 if (errcode != arg_in_range) {
2750 jio_fprintf(defaultStream::error_stream(),
2751 "Invalid maximum code cache size: %s.\n", option->optionString);
2752 return JNI_EINVAL;
2753 }
2754 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2755 //-XX:IncreaseFirstTierCompileThresholdAt=
2756 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2757 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2758 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2759 jio_fprintf(defaultStream::error_stream(),
2760 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2761 option->optionString);
2762 return JNI_EINVAL;
2763 }
2764 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2765 // -green
2766 } else if (match_option(option, "-green", &tail)) {
2767 jio_fprintf(defaultStream::error_stream(),
2768 "Green threads support not available\n");
2769 return JNI_EINVAL;
2770 // -native
2771 } else if (match_option(option, "-native", &tail)) {
2772 // HotSpot always uses native threads, ignore silently for compatibility
2773 // -Xsqnopause
2774 } else if (match_option(option, "-Xsqnopause", &tail)) {
2775 // EVM option, ignore silently for compatibility
2776 // -Xrs
2777 } else if (match_option(option, "-Xrs", &tail)) {
2778 // Classic/EVM option, new functionality
2779 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2780 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2781 // change default internal VM signals used - lower case for back compat
2782 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2783 // -Xoptimize
2784 } else if (match_option(option, "-Xoptimize", &tail)) {
2785 // EVM option, ignore silently for compatibility
2786 // -Xprof
2787 } else if (match_option(option, "-Xprof", &tail)) {
2788 #if INCLUDE_FPROF
2789 _has_profile = true;
2790 #else // INCLUDE_FPROF
2791 jio_fprintf(defaultStream::error_stream(),
2792 "Flat profiling is not supported in this VM.\n");
2793 return JNI_ERR;
2794 #endif // INCLUDE_FPROF
2795 // -Xconcurrentio
2796 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2797 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2798 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2799 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2800 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2801 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2802
2803 // -Xinternalversion
2804 } else if (match_option(option, "-Xinternalversion", &tail)) {
2805 jio_fprintf(defaultStream::output_stream(), "%s\n",
2806 VM_Version::internal_vm_info_string());
2807 vm_exit(0);
2808 #ifndef PRODUCT
2809 // -Xprintflags
2810 } else if (match_option(option, "-Xprintflags", &tail)) {
2811 CommandLineFlags::printFlags(tty, false);
2812 vm_exit(0);
2813 #endif
2814 // -D
2815 } else if (match_option(option, "-D", &tail)) {
2816 if (!add_property(tail)) {
2817 return JNI_ENOMEM;
2818 }
2819 // Out of the box management support
2820 if (match_option(option, "-Dcom.sun.management", &tail)) {
2821 #if INCLUDE_MANAGEMENT
2822 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2823 #else
2824 jio_fprintf(defaultStream::output_stream(),
2825 "-Dcom.sun.management is not supported in this VM.\n");
2826 return JNI_ERR;
2827 #endif
2828 }
2829 // -Xint
2830 } else if (match_option(option, "-Xint", &tail)) {
2831 set_mode_flags(_int);
2832 // -Xmixed
2833 } else if (match_option(option, "-Xmixed", &tail)) {
2834 set_mode_flags(_mixed);
2835 // -Xcomp
2836 } else if (match_option(option, "-Xcomp", &tail)) {
2837 // for testing the compiler; turn off all flags that inhibit compilation
2838 set_mode_flags(_comp);
2839 // -Xshare:dump
2840 } else if (match_option(option, "-Xshare:dump", &tail)) {
2841 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2842 set_mode_flags(_int); // Prevent compilation, which creates objects
2843 // -Xshare:on
2844 } else if (match_option(option, "-Xshare:on", &tail)) {
2845 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2846 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2847 // -Xshare:auto
2848 } else if (match_option(option, "-Xshare:auto", &tail)) {
2849 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2850 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2851 // -Xshare:off
2852 } else if (match_option(option, "-Xshare:off", &tail)) {
2853 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2854 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2855 // -Xverify
2856 } else if (match_option(option, "-Xverify", &tail)) {
2857 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2858 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2859 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2860 } else if (strcmp(tail, ":remote") == 0) {
2861 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2862 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2863 } else if (strcmp(tail, ":none") == 0) {
2864 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2865 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2866 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2867 return JNI_EINVAL;
2868 }
2869 // -Xdebug
2870 } else if (match_option(option, "-Xdebug", &tail)) {
2871 // note this flag has been used, then ignore
2872 set_xdebug_mode(true);
2873 // -Xnoagent
2874 } else if (match_option(option, "-Xnoagent", &tail)) {
2875 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2876 } else if (match_option(option, "-Xboundthreads", &tail)) {
2877 // Bind user level threads to kernel threads (Solaris only)
2878 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2879 } else if (match_option(option, "-Xloggc:", &tail)) {
2880 // Redirect GC output to the file. -Xloggc:<filename>
2881 // ostream_init_log(), when called will use this filename
2882 // to initialize a fileStream.
2883 _gc_log_filename = strdup(tail);
2884 if (!is_filename_valid(_gc_log_filename)) {
2885 jio_fprintf(defaultStream::output_stream(),
2886 "Invalid file name for use with -Xloggc: Filename can only contain the "
2887 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2888 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2889 return JNI_EINVAL;
2890 }
2891 FLAG_SET_CMDLINE(bool, PrintGC, true);
2892 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2893
2894 // JNI hooks
2895 } else if (match_option(option, "-Xcheck", &tail)) {
2896 if (!strcmp(tail, ":jni")) {
2897 #if !INCLUDE_JNI_CHECK
2898 warning("JNI CHECKING is not supported in this VM");
2899 #else
2900 CheckJNICalls = true;
2901 #endif // INCLUDE_JNI_CHECK
2902 } else if (is_bad_option(option, args->ignoreUnrecognized,
2903 "check")) {
2904 return JNI_EINVAL;
2905 }
2906 } else if (match_option(option, "vfprintf", &tail)) {
2907 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2908 } else if (match_option(option, "exit", &tail)) {
2909 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2910 } else if (match_option(option, "abort", &tail)) {
2911 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2912 // -XX:+AggressiveHeap
2913 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2914
2915 // This option inspects the machine and attempts to set various
2916 // parameters to be optimal for long-running, memory allocation
2917 // intensive jobs. It is intended for machines with large
2918 // amounts of cpu and memory.
2919
2920 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2921 // VM, but we may not be able to represent the total physical memory
2922 // available (like having 8gb of memory on a box but using a 32bit VM).
2923 // Thus, we need to make sure we're using a julong for intermediate
2924 // calculations.
2925 julong initHeapSize;
2926 julong total_memory = os::physical_memory();
2927
2928 if (total_memory < (julong)256*M) {
2929 jio_fprintf(defaultStream::error_stream(),
2930 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2931 vm_exit(1);
2932 }
2933
2934 // The heap size is half of available memory, or (at most)
2935 // all of possible memory less 160mb (leaving room for the OS
2936 // when using ISM). This is the maximum; because adaptive sizing
2937 // is turned on below, the actual space used may be smaller.
2938
2939 initHeapSize = MIN2(total_memory / (julong)2,
2940 total_memory - (julong)160*M);
2941
2942 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2943
2944 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2945 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2946 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2947 // Currently the minimum size and the initial heap sizes are the same.
2948 set_min_heap_size(initHeapSize);
2949 }
2950 if (FLAG_IS_DEFAULT(NewSize)) {
2951 // Make the young generation 3/8ths of the total heap.
2952 FLAG_SET_CMDLINE(uintx, NewSize,
2953 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2954 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2955 }
2956
2957 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2958 FLAG_SET_DEFAULT(UseLargePages, true);
2959 #endif
2960
2961 // Increase some data structure sizes for efficiency
2962 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2963 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2964 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2965
2966 // See the OldPLABSize comment below, but replace 'after promotion'
2967 // with 'after copying'. YoungPLABSize is the size of the survivor
2968 // space per-gc-thread buffers. The default is 4kw.
2969 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2970
2971 // OldPLABSize is the size of the buffers in the old gen that
2972 // UseParallelGC uses to promote live data that doesn't fit in the
2973 // survivor spaces. At any given time, there's one for each gc thread.
2974 // The default size is 1kw. These buffers are rarely used, since the
2975 // survivor spaces are usually big enough. For specjbb, however, there
2976 // are occasions when there's lots of live data in the young gen
2977 // and we end up promoting some of it. We don't have a definite
2978 // explanation for why bumping OldPLABSize helps, but the theory
2979 // is that a bigger PLAB results in retaining something like the
2980 // original allocation order after promotion, which improves mutator
2981 // locality. A minor effect may be that larger PLABs reduce the
2982 // number of PLAB allocation events during gc. The value of 8kw
2983 // was arrived at by experimenting with specjbb.
2984 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2985
2986 // Enable parallel GC and adaptive generation sizing
2987 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2988 FLAG_SET_DEFAULT(ParallelGCThreads,
2989 Abstract_VM_Version::parallel_worker_threads());
2990
2991 // Encourage steady state memory management
2992 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2993
2994 // This appears to improve mutator locality
2995 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2996
2997 // Get around early Solaris scheduling bug
2998 // (affinity vs other jobs on system)
2999 // but disallow DR and offlining (5008695).
3000 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3001
3002 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3003 // The last option must always win.
3004 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3005 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3006 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3007 // The last option must always win.
3008 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3009 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3010 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3011 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3012 jio_fprintf(defaultStream::error_stream(),
3013 "Please use CMSClassUnloadingEnabled in place of "
3014 "CMSPermGenSweepingEnabled in the future\n");
3015 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3016 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3017 jio_fprintf(defaultStream::error_stream(),
3018 "Please use -XX:+UseGCOverheadLimit in place of "
3019 "-XX:+UseGCTimeLimit in the future\n");
3020 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3021 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3022 jio_fprintf(defaultStream::error_stream(),
3023 "Please use -XX:-UseGCOverheadLimit in place of "
3024 "-XX:-UseGCTimeLimit in the future\n");
3025 // The TLE options are for compatibility with 1.3 and will be
3026 // removed without notice in a future release. These options
3027 // are not to be documented.
3028 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3029 // No longer used.
3030 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3031 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3032 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3033 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3034 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3035 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3036 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3037 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3038 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3039 // No longer used.
3040 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3041 julong long_tlab_size = 0;
3042 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3043 if (errcode != arg_in_range) {
3044 jio_fprintf(defaultStream::error_stream(),
3045 "Invalid TLAB size: %s\n", option->optionString);
3046 describe_range_error(errcode);
3047 return JNI_EINVAL;
3048 }
3049 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3050 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3051 // No longer used.
3052 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3053 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3054 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3055 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3056 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3057 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3058 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3059 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3060 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3061 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3062 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3063 #if defined(DTRACE_ENABLED)
3064 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3065 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3066 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3067 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3068 #else // defined(DTRACE_ENABLED)
3069 jio_fprintf(defaultStream::error_stream(),
3070 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3071 return JNI_EINVAL;
3072 #endif // defined(DTRACE_ENABLED)
3073 #ifdef ASSERT
3074 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3075 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3076 // disable scavenge before parallel mark-compact
3077 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3078 #endif
3079 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3080 julong cms_blocks_to_claim = (julong)atol(tail);
3081 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3082 jio_fprintf(defaultStream::error_stream(),
3083 "Please use -XX:OldPLABSize in place of "
3084 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3085 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3086 julong cms_blocks_to_claim = (julong)atol(tail);
3087 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3088 jio_fprintf(defaultStream::error_stream(),
3089 "Please use -XX:OldPLABSize in place of "
3090 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3091 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3092 julong old_plab_size = 0;
3093 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3094 if (errcode != arg_in_range) {
3095 jio_fprintf(defaultStream::error_stream(),
3096 "Invalid old PLAB size: %s\n", option->optionString);
3097 describe_range_error(errcode);
3098 return JNI_EINVAL;
3099 }
3100 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3101 jio_fprintf(defaultStream::error_stream(),
3102 "Please use -XX:OldPLABSize in place of "
3103 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3104 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3105 julong young_plab_size = 0;
3106 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3107 if (errcode != arg_in_range) {
3108 jio_fprintf(defaultStream::error_stream(),
3109 "Invalid young PLAB size: %s\n", option->optionString);
3110 describe_range_error(errcode);
3111 return JNI_EINVAL;
3112 }
3113 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3114 jio_fprintf(defaultStream::error_stream(),
3115 "Please use -XX:YoungPLABSize in place of "
3116 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3117 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3118 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3119 julong stack_size = 0;
3120 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3121 if (errcode != arg_in_range) {
3122 jio_fprintf(defaultStream::error_stream(),
3123 "Invalid mark stack size: %s\n", option->optionString);
3124 describe_range_error(errcode);
3125 return JNI_EINVAL;
3126 }
3127 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3128 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3129 julong max_stack_size = 0;
3130 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3131 if (errcode != arg_in_range) {
3132 jio_fprintf(defaultStream::error_stream(),
3133 "Invalid maximum mark stack size: %s\n",
3134 option->optionString);
3135 describe_range_error(errcode);
3136 return JNI_EINVAL;
3137 }
3138 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3139 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3140 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3141 uintx conc_threads = 0;
3142 if (!parse_uintx(tail, &conc_threads, 1)) {
3143 jio_fprintf(defaultStream::error_stream(),
3144 "Invalid concurrent threads: %s\n", option->optionString);
3145 return JNI_EINVAL;
3146 }
3147 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3148 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3149 julong max_direct_memory_size = 0;
3150 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3151 if (errcode != arg_in_range) {
3152 jio_fprintf(defaultStream::error_stream(),
3153 "Invalid maximum direct memory size: %s\n",
3154 option->optionString);
3155 describe_range_error(errcode);
3156 return JNI_EINVAL;
3157 }
3158 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3159 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3160 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3161 // away and will cause VM initialization failures!
3162 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3163 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3164 #if !INCLUDE_MANAGEMENT
3165 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3166 jio_fprintf(defaultStream::error_stream(),
3167 "ManagementServer is not supported in this VM.\n");
3168 return JNI_ERR;
3169 #endif // INCLUDE_MANAGEMENT
3170 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3171 // Skip -XX:Flags= since that case has already been handled
3172 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3173 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3174 return JNI_EINVAL;
3175 }
3176 }
3177 // Unknown option
3178 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3179 return JNI_ERR;
3180 }
3181 }
3182
3183 // Change the default value for flags which have different default values
3184 // when working with older JDKs.
3185 #ifdef LINUX
3186 if (JDK_Version::current().compare_major(6) <= 0 &&
3187 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3188 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3189 }
3190 #endif // LINUX
3191 return JNI_OK;
3192 }
3193
3194 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3195 // This must be done after all -D arguments have been processed.
3196 scp_p->expand_endorsed();
3197
3198 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3199 // Assemble the bootclasspath elements into the final path.
3200 Arguments::set_sysclasspath(scp_p->combined_path());
3201 }
3202
3203 // This must be done after all arguments have been processed.
3204 // java_compiler() true means set to "NONE" or empty.
3205 if (java_compiler() && !xdebug_mode()) {
3206 // For backwards compatibility, we switch to interpreted mode if
3207 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3208 // not specified.
3209 set_mode_flags(_int);
3210 }
3211 if (CompileThreshold == 0) {
3212 set_mode_flags(_int);
3213 }
3214
3215 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3216 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3217 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3218 }
3219
3220 #ifndef COMPILER2
3221 // Don't degrade server performance for footprint
3222 if (FLAG_IS_DEFAULT(UseLargePages) &&
3223 MaxHeapSize < LargePageHeapSizeThreshold) {
3224 // No need for large granularity pages w/small heaps.
3225 // Note that large pages are enabled/disabled for both the
3226 // Java heap and the code cache.
3227 FLAG_SET_DEFAULT(UseLargePages, false);
3228 }
3229
3230 #else
3231 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3232 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3233 }
3234 #endif
3235
3236 #ifndef TIERED
3237 // Tiered compilation is undefined.
3238 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3239 #endif
3240
3241 // If we are running in a headless jre, force java.awt.headless property
3242 // to be true unless the property has already been set.
3243 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3244 if (os::is_headless_jre()) {
3245 const char* headless = Arguments::get_property("java.awt.headless");
3246 if (headless == NULL) {
3247 char envbuffer[128];
3248 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3249 if (!add_property("java.awt.headless=true")) {
3250 return JNI_ENOMEM;
3251 }
3252 } else {
3253 char buffer[256];
3254 strcpy(buffer, "java.awt.headless=");
3255 strcat(buffer, envbuffer);
3256 if (!add_property(buffer)) {
3257 return JNI_ENOMEM;
3258 }
3259 }
3260 }
3261 }
3262
3263 if (!check_vm_args_consistency()) {
3264 return JNI_ERR;
3265 }
3266
3267 return JNI_OK;
3268 }
3269
3270 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3271 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3272 scp_assembly_required_p);
3273 }
3274
3275 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3276 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3277 scp_assembly_required_p);
3278 }
3279
3280 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3281 const int N_MAX_OPTIONS = 64;
3282 const int OPTION_BUFFER_SIZE = 1024;
3283 char buffer[OPTION_BUFFER_SIZE];
3284
3285 // The variable will be ignored if it exceeds the length of the buffer.
3286 // Don't check this variable if user has special privileges
3287 // (e.g. unix su command).
3288 if (os::getenv(name, buffer, sizeof(buffer)) &&
3289 !os::have_special_privileges()) {
3290 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3291 jio_fprintf(defaultStream::error_stream(),
3292 "Picked up %s: %s\n", name, buffer);
3293 char* rd = buffer; // pointer to the input string (rd)
3294 int i;
3295 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3296 while (isspace(*rd)) rd++; // skip whitespace
3297 if (*rd == 0) break; // we re done when the input string is read completely
3298
3299 // The output, option string, overwrites the input string.
3300 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3301 // input string (rd).
3302 char* wrt = rd;
3303
3304 options[i++].optionString = wrt; // Fill in option
3305 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3306 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3307 int quote = *rd; // matching quote to look for
3308 rd++; // don't copy open quote
3309 while (*rd != quote) { // include everything (even spaces) up until quote
3310 if (*rd == 0) { // string termination means unmatched string
3311 jio_fprintf(defaultStream::error_stream(),
3312 "Unmatched quote in %s\n", name);
3313 return JNI_ERR;
3314 }
3315 *wrt++ = *rd++; // copy to option string
3316 }
3317 rd++; // don't copy close quote
3318 } else {
3319 *wrt++ = *rd++; // copy to option string
3320 }
3321 }
3322 // Need to check if we're done before writing a NULL,
3323 // because the write could be to the byte that rd is pointing to.
3324 if (*rd++ == 0) {
3325 *wrt = 0;
3326 break;
3327 }
3328 *wrt = 0; // Zero terminate option
3329 }
3330 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3331 JavaVMInitArgs vm_args;
3332 vm_args.version = JNI_VERSION_1_2;
3333 vm_args.options = options;
3334 vm_args.nOptions = i;
3335 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3336
3337 if (PrintVMOptions) {
3338 const char* tail;
3339 for (int i = 0; i < vm_args.nOptions; i++) {
3340 const JavaVMOption *option = vm_args.options + i;
3341 if (match_option(option, "-XX:", &tail)) {
3342 logOption(tail);
3343 }
3344 }
3345 }
3346
3347 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3348 }
3349 return JNI_OK;
3350 }
3351
3352 void Arguments::set_shared_spaces_flags() {
3353 if (DumpSharedSpaces) {
3354 if (RequireSharedSpaces) {
3355 warning("cannot dump shared archive while using shared archive");
3356 }
3357 UseSharedSpaces = false;
3358 #ifdef _LP64
3359 if (!UseCompressedOops || !UseCompressedClassPointers) {
3360 vm_exit_during_initialization(
3361 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3362 }
3363 } else {
3364 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3365 if (!UseCompressedOops || !UseCompressedClassPointers) {
3366 no_shared_spaces();
3367 }
3368 #endif
3369 }
3370 }
3371
3372 #if !INCLUDE_ALL_GCS
3373 static void force_serial_gc() {
3374 FLAG_SET_DEFAULT(UseSerialGC, true);
3375 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3376 UNSUPPORTED_GC_OPTION(UseG1GC);
3377 UNSUPPORTED_GC_OPTION(UseParallelGC);
3378 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3379 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3380 UNSUPPORTED_GC_OPTION(UseParNewGC);
3381 }
3382 #endif // INCLUDE_ALL_GCS
3383
3384 // Sharing support
3385 // Construct the path to the archive
3386 static char* get_shared_archive_path() {
3387 char *shared_archive_path;
3388 if (SharedArchiveFile == NULL) {
3389 char jvm_path[JVM_MAXPATHLEN];
3390 os::jvm_path(jvm_path, sizeof(jvm_path));
3391 char *end = strrchr(jvm_path, *os::file_separator());
3392 if (end != NULL) *end = '\0';
3393 size_t jvm_path_len = strlen(jvm_path);
3394 size_t file_sep_len = strlen(os::file_separator());
3395 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3396 file_sep_len + 20, mtInternal);
3397 if (shared_archive_path != NULL) {
3398 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3399 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3400 strncat(shared_archive_path, "classes.jsa", 11);
3401 }
3402 } else {
3403 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3404 if (shared_archive_path != NULL) {
3405 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3406 }
3407 }
3408 return shared_archive_path;
3409 }
3410
3411 #ifndef PRODUCT
3412 // Determine whether LogVMOutput should be implicitly turned on.
3413 static bool use_vm_log() {
3414 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3415 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3416 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3417 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3418 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3419 return true;
3420 }
3421
3422 #ifdef COMPILER1
3423 if (PrintC1Statistics) {
3424 return true;
3425 }
3426 #endif // COMPILER1
3427
3428 #ifdef COMPILER2
3429 if (PrintOptoAssembly || PrintOptoStatistics) {
3430 return true;
3431 }
3432 #endif // COMPILER2
3433
3434 return false;
3435 }
3436 #endif // PRODUCT
3437
3438 // Parse entry point called from JNI_CreateJavaVM
3439
3440 jint Arguments::parse(const JavaVMInitArgs* args) {
3441
3442 // Remaining part of option string
3443 const char* tail;
3444
3445 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3446 const char* hotspotrc = ".hotspotrc";
3447 bool settings_file_specified = false;
3448 bool needs_hotspotrc_warning = false;
3449
3450 const char* flags_file;
3451 int index;
3452 for (index = 0; index < args->nOptions; index++) {
3453 const JavaVMOption *option = args->options + index;
3454 if (match_option(option, "-XX:Flags=", &tail)) {
3455 flags_file = tail;
3456 settings_file_specified = true;
3457 }
3458 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3459 PrintVMOptions = true;
3460 }
3461 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3462 PrintVMOptions = false;
3463 }
3464 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3465 IgnoreUnrecognizedVMOptions = true;
3466 }
3467 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3468 IgnoreUnrecognizedVMOptions = false;
3469 }
3470 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3471 CommandLineFlags::printFlags(tty, false);
3472 vm_exit(0);
3473 }
3474 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3475 #if INCLUDE_NMT
3476 MemTracker::init_tracking_options(tail);
3477 #else
3478 jio_fprintf(defaultStream::error_stream(),
3479 "Native Memory Tracking is not supported in this VM\n");
3480 return JNI_ERR;
3481 #endif
3482 }
3483
3484
3485 #ifndef PRODUCT
3486 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3487 CommandLineFlags::printFlags(tty, true);
3488 vm_exit(0);
3489 }
3490 #endif
3491 }
3492
3493 if (IgnoreUnrecognizedVMOptions) {
3494 // uncast const to modify the flag args->ignoreUnrecognized
3495 *(jboolean*)(&args->ignoreUnrecognized) = true;
3496 }
3497
3498 // Parse specified settings file
3499 if (settings_file_specified) {
3500 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3501 return JNI_EINVAL;
3502 }
3503 } else {
3504 #ifdef ASSERT
3505 // Parse default .hotspotrc settings file
3506 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3507 return JNI_EINVAL;
3508 }
3509 #else
3510 struct stat buf;
3511 if (os::stat(hotspotrc, &buf) == 0) {
3512 needs_hotspotrc_warning = true;
3513 }
3514 #endif
3515 }
3516
3517 if (PrintVMOptions) {
3518 for (index = 0; index < args->nOptions; index++) {
3519 const JavaVMOption *option = args->options + index;
3520 if (match_option(option, "-XX:", &tail)) {
3521 logOption(tail);
3522 }
3523 }
3524 }
3525
3526 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3527 jint result = parse_vm_init_args(args);
3528 if (result != JNI_OK) {
3529 return result;
3530 }
3531
3532 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3533 SharedArchivePath = get_shared_archive_path();
3534 if (SharedArchivePath == NULL) {
3535 return JNI_ENOMEM;
3536 }
3537
3538 // Delay warning until here so that we've had a chance to process
3539 // the -XX:-PrintWarnings flag
3540 if (needs_hotspotrc_warning) {
3541 warning("%s file is present but has been ignored. "
3542 "Run with -XX:Flags=%s to load the file.",
3543 hotspotrc, hotspotrc);
3544 }
3545
3546 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3547 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3548 #endif
3549
3550 #if INCLUDE_ALL_GCS
3551 #if (defined JAVASE_EMBEDDED || defined ARM)
3552 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3553 #endif
3554 #endif
3555
3556 #ifndef PRODUCT
3557 if (TraceBytecodesAt != 0) {
3558 TraceBytecodes = true;
3559 }
3560 if (CountCompiledCalls) {
3561 if (UseCounterDecay) {
3562 warning("UseCounterDecay disabled because CountCalls is set");
3563 UseCounterDecay = false;
3564 }
3565 }
3566 #endif // PRODUCT
3567
3568 // JSR 292 is not supported before 1.7
3569 if (!JDK_Version::is_gte_jdk17x_version()) {
3570 if (EnableInvokeDynamic) {
3571 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3572 warning("JSR 292 is not supported before 1.7. Disabling support.");
3573 }
3574 EnableInvokeDynamic = false;
3575 }
3576 }
3577
3578 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3579 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3580 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3581 }
3582 ScavengeRootsInCode = 1;
3583 }
3584
3585 if (PrintGCDetails) {
3586 // Turn on -verbose:gc options as well
3587 PrintGC = true;
3588 }
3589
3590 if (!JDK_Version::is_gte_jdk18x_version()) {
3591 // To avoid changing the log format for 7 updates this flag is only
3592 // true by default in JDK8 and above.
3593 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3594 FLAG_SET_DEFAULT(PrintGCCause, false);
3595 }
3596 }
3597
3598 // Set object alignment values.
3599 set_object_alignment();
3600
3601 #if !INCLUDE_ALL_GCS
3602 force_serial_gc();
3603 #endif // INCLUDE_ALL_GCS
3604 #if !INCLUDE_CDS
3605 if (DumpSharedSpaces || RequireSharedSpaces) {
3606 jio_fprintf(defaultStream::error_stream(),
3607 "Shared spaces are not supported in this VM\n");
3608 return JNI_ERR;
3609 }
3610 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3611 warning("Shared spaces are not supported in this VM");
3612 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3613 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3614 }
3615 no_shared_spaces();
3616 #endif // INCLUDE_CDS
3617
3618 return JNI_OK;
3619 }
3620
3621 jint Arguments::apply_ergo() {
3622
3623 // Set flags based on ergonomics.
3624 set_ergonomics_flags();
3625
3626 set_shared_spaces_flags();
3627
3628 // Check the GC selections again.
3629 if (!check_gc_consistency()) {
3630 return JNI_EINVAL;
3631 }
3632
3633 if (TieredCompilation) {
3634 set_tiered_flags();
3635 } else {
3636 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3637 if (CompilationPolicyChoice >= 2) {
3638 vm_exit_during_initialization(
3639 "Incompatible compilation policy selected", NULL);
3640 }
3641 }
3642
3643 // Set heap size based on available physical memory
3644 set_heap_size();
3645
3646 #if INCLUDE_ALL_GCS
3647 // Set per-collector flags
3648 if (UseParallelGC || UseParallelOldGC) {
3649 set_parallel_gc_flags();
3650 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3651 set_cms_and_parnew_gc_flags();
3652 } else if (UseParNewGC) { // skipped if CMS is set above
3653 set_parnew_gc_flags();
3654 } else if (UseG1GC) {
3655 set_g1_gc_flags();
3656 }
3657 check_deprecated_gcs();
3658 check_deprecated_gc_flags();
3659 if (AssumeMP && !UseSerialGC) {
3660 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3661 warning("If the number of processors is expected to increase from one, then"
3662 " you should configure the number of parallel GC threads appropriately"
3663 " using -XX:ParallelGCThreads=N");
3664 }
3665 }
3666 #else // INCLUDE_ALL_GCS
3667 assert(verify_serial_gc_flags(), "SerialGC unset");
3668 #endif // INCLUDE_ALL_GCS
3669
3670 // Set bytecode rewriting flags
3671 set_bytecode_flags();
3672
3673 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3674 set_aggressive_opts_flags();
3675
3676 // Turn off biased locking for locking debug mode flags,
3677 // which are subtlely different from each other but neither works with
3678 // biased locking.
3679 if (UseHeavyMonitors
3680 #ifdef COMPILER1
3681 || !UseFastLocking
3682 #endif // COMPILER1
3683 ) {
3684 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3685 // flag set to true on command line; warn the user that they
3686 // can't enable biased locking here
3687 warning("Biased Locking is not supported with locking debug flags"
3688 "; ignoring UseBiasedLocking flag." );
3689 }
3690 UseBiasedLocking = false;
3691 }
3692
3693 #ifdef CC_INTERP
3694 // Clear flags not supported by the C++ interpreter
3695 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3696 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3697 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3698 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3699 #endif // CC_INTERP
3700
3701 #ifdef COMPILER2
3702 if (!UseBiasedLocking || EmitSync != 0) {
3703 UseOptoBiasInlining = false;
3704 }
3705 if (!EliminateLocks) {
3706 EliminateNestedLocks = false;
3707 }
3708 if (!Inline) {
3709 IncrementalInline = false;
3710 }
3711 #ifndef PRODUCT
3712 if (!IncrementalInline) {
3713 AlwaysIncrementalInline = false;
3714 }
3715 #endif
3716 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3717 // incremental inlining: bump MaxNodeLimit
3718 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3719 }
3720 #endif
3721
3722 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3723 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3724 DebugNonSafepoints = true;
3725 }
3726
3727 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3728 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3729 }
3730
3731 #ifndef PRODUCT
3732 if (CompileTheWorld) {
3733 // Force NmethodSweeper to sweep whole CodeCache each time.
3734 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3735 NmethodSweepFraction = 1;
3736 }
3737 }
3738
3739 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3740 if (use_vm_log()) {
3741 LogVMOutput = true;
3742 }
3743 }
3744 #endif // PRODUCT
3745
3746 if (PrintCommandLineFlags) {
3747 CommandLineFlags::printSetFlags(tty);
3748 }
3749
3750 // Apply CPU specific policy for the BiasedLocking
3751 if (UseBiasedLocking) {
3752 if (!VM_Version::use_biased_locking() &&
3753 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3754 UseBiasedLocking = false;
3755 }
3756 }
3757
3758 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3759 // but only if not already set on the commandline
3760 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3761 bool set = false;
3762 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3763 if (!set) {
3764 FLAG_SET_DEFAULT(PauseAtExit, true);
3765 }
3766 }
3767
3768 return JNI_OK;
3769 }
3770
3771 jint Arguments::adjust_after_os() {
3772 #if INCLUDE_ALL_GCS
3773 if (UseParallelGC || UseParallelOldGC) {
3774 if (UseNUMA) {
3775 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3776 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3777 }
3778 // For those collectors or operating systems (eg, Windows) that do
3779 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3780 UseNUMAInterleaving = true;
3781 }
3782 }
3783 #endif // INCLUDE_ALL_GCS
3784 return JNI_OK;
3785 }
3786
3787 int Arguments::PropertyList_count(SystemProperty* pl) {
3788 int count = 0;
3789 while(pl != NULL) {
3790 count++;
3791 pl = pl->next();
3792 }
3793 return count;
3794 }
3795
3796 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3797 assert(key != NULL, "just checking");
3798 SystemProperty* prop;
3799 for (prop = pl; prop != NULL; prop = prop->next()) {
3800 if (strcmp(key, prop->key()) == 0) return prop->value();
3801 }
3802 return NULL;
3803 }
3804
3805 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3806 int count = 0;
3807 const char* ret_val = NULL;
3808
3809 while(pl != NULL) {
3810 if(count >= index) {
3811 ret_val = pl->key();
3812 break;
3813 }
3814 count++;
3815 pl = pl->next();
3816 }
3817
3818 return ret_val;
3819 }
3820
3821 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3822 int count = 0;
3823 char* ret_val = NULL;
3824
3825 while(pl != NULL) {
3826 if(count >= index) {
3827 ret_val = pl->value();
3828 break;
3829 }
3830 count++;
3831 pl = pl->next();
3832 }
3833
3834 return ret_val;
3835 }
3836
3837 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3838 SystemProperty* p = *plist;
3839 if (p == NULL) {
3840 *plist = new_p;
3841 } else {
3842 while (p->next() != NULL) {
3843 p = p->next();
3844 }
3845 p->set_next(new_p);
3846 }
3847 }
3848
3849 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3850 if (plist == NULL)
3851 return;
3852
3853 SystemProperty* new_p = new SystemProperty(k, v, true);
3854 PropertyList_add(plist, new_p);
3855 }
3856
3857 // This add maintains unique property key in the list.
3858 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3859 if (plist == NULL)
3860 return;
3861
3862 // If property key exist then update with new value.
3863 SystemProperty* prop;
3864 for (prop = *plist; prop != NULL; prop = prop->next()) {
3865 if (strcmp(k, prop->key()) == 0) {
3866 if (append) {
3867 prop->append_value(v);
3868 } else {
3869 prop->set_value(v);
3870 }
3871 return;
3872 }
3873 }
3874
3875 PropertyList_add(plist, k, v);
3876 }
3877
3878 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3879 // Returns true if all of the source pointed by src has been copied over to
3880 // the destination buffer pointed by buf. Otherwise, returns false.
3881 // Notes:
3882 // 1. If the length (buflen) of the destination buffer excluding the
3883 // NULL terminator character is not long enough for holding the expanded
3884 // pid characters, it also returns false instead of returning the partially
3885 // expanded one.
3886 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3887 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3888 char* buf, size_t buflen) {
3889 const char* p = src;
3890 char* b = buf;
3891 const char* src_end = &src[srclen];
3892 char* buf_end = &buf[buflen - 1];
3893
3894 while (p < src_end && b < buf_end) {
3895 if (*p == '%') {
3896 switch (*(++p)) {
3897 case '%': // "%%" ==> "%"
3898 *b++ = *p++;
3899 break;
3900 case 'p': { // "%p" ==> current process id
3901 // buf_end points to the character before the last character so
3902 // that we could write '\0' to the end of the buffer.
3903 size_t buf_sz = buf_end - b + 1;
3904 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3905
3906 // if jio_snprintf fails or the buffer is not long enough to hold
3907 // the expanded pid, returns false.
3908 if (ret < 0 || ret >= (int)buf_sz) {
3909 return false;
3910 } else {
3911 b += ret;
3912 assert(*b == '\0', "fail in copy_expand_pid");
3913 if (p == src_end && b == buf_end + 1) {
3914 // reach the end of the buffer.
3915 return true;
3916 }
3917 }
3918 p++;
3919 break;
3920 }
3921 default :
3922 *b++ = '%';
3923 }
3924 } else {
3925 *b++ = *p++;
3926 }
3927 }
3928 *b = '\0';
3929 return (p == src_end); // return false if not all of the source was copied
3930 }