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 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1104 // Conflict: required to use shared spaces (-Xshare:on), but
1105 // incompatible command line options were chosen.
1106
1107 static void no_shared_spaces() {
1108 if (RequireSharedSpaces) {
1109 jio_fprintf(defaultStream::error_stream(),
1110 "Class data sharing is inconsistent with other specified options.\n");
1111 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1112 } else {
1113 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1114 }
1115 }
1116 #endif
1117
1118 void Arguments::set_tiered_flags() {
1119 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1120 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1121 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1122 }
1123 if (CompilationPolicyChoice < 2) {
1124 vm_exit_during_initialization(
1125 "Incompatible compilation policy selected", NULL);
1126 }
1127 // Increase the code cache size - tiered compiles a lot more.
1128 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1129 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1130 }
1131 if (!UseInterpreter) { // -Xcomp
1132 Tier3InvokeNotifyFreqLog = 0;
1133 Tier4InvocationThreshold = 0;
1134 }
1135 }
1136
1137 #if INCLUDE_ALL_GCS
1138 static void disable_adaptive_size_policy(const char* collector_name) {
1139 if (UseAdaptiveSizePolicy) {
1140 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1141 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1142 collector_name);
1143 }
1144 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1145 }
1146 }
1147
1148 void Arguments::set_parnew_gc_flags() {
1149 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1150 "control point invariant");
1151 assert(UseParNewGC, "Error");
1152
1153 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1154 disable_adaptive_size_policy("UseParNewGC");
1155
1156 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1157 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1158 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1159 } else if (ParallelGCThreads == 0) {
1160 jio_fprintf(defaultStream::error_stream(),
1161 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1162 vm_exit(1);
1163 }
1164
1165 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1166 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1167 // we set them to 1024 and 1024.
1168 // See CR 6362902.
1169 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1170 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1171 }
1172 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1173 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1174 }
1175
1176 // AlwaysTenure flag should make ParNew promote all at first collection.
1177 // See CR 6362902.
1178 if (AlwaysTenure) {
1179 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1180 }
1181 // When using compressed oops, we use local overflow stacks,
1182 // rather than using a global overflow list chained through
1183 // the klass word of the object's pre-image.
1184 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1185 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1186 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1187 }
1188 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1189 }
1190 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1191 }
1192
1193 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1194 // sparc/solaris for certain applications, but would gain from
1195 // further optimization and tuning efforts, and would almost
1196 // certainly gain from analysis of platform and environment.
1197 void Arguments::set_cms_and_parnew_gc_flags() {
1198 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1199 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1200
1201 // If we are using CMS, we prefer to UseParNewGC,
1202 // unless explicitly forbidden.
1203 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1204 FLAG_SET_ERGO(bool, UseParNewGC, true);
1205 }
1206
1207 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1208 disable_adaptive_size_policy("UseConcMarkSweepGC");
1209
1210 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1211 // as needed.
1212 if (UseParNewGC) {
1213 set_parnew_gc_flags();
1214 }
1215
1216 size_t max_heap = align_size_down(MaxHeapSize,
1217 CardTableRS::ct_max_alignment_constraint());
1218
1219 // Now make adjustments for CMS
1220 intx tenuring_default = (intx)6;
1221 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1222
1223 // Preferred young gen size for "short" pauses:
1224 // upper bound depends on # of threads and NewRatio.
1225 const uintx parallel_gc_threads =
1226 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1227 const size_t preferred_max_new_size_unaligned =
1228 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1229 size_t preferred_max_new_size =
1230 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1231
1232 // Unless explicitly requested otherwise, size young gen
1233 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1234
1235 // If either MaxNewSize or NewRatio is set on the command line,
1236 // assume the user is trying to set the size of the young gen.
1237 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1238
1239 // Set MaxNewSize to our calculated preferred_max_new_size unless
1240 // NewSize was set on the command line and it is larger than
1241 // preferred_max_new_size.
1242 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1243 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1244 } else {
1245 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1246 }
1247 if (PrintGCDetails && Verbose) {
1248 // Too early to use gclog_or_tty
1249 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1250 }
1251
1252 // Code along this path potentially sets NewSize and OldSize
1253 if (PrintGCDetails && Verbose) {
1254 // Too early to use gclog_or_tty
1255 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1256 " initial_heap_size: " SIZE_FORMAT
1257 " max_heap: " SIZE_FORMAT,
1258 min_heap_size(), InitialHeapSize, max_heap);
1259 }
1260 size_t min_new = preferred_max_new_size;
1261 if (FLAG_IS_CMDLINE(NewSize)) {
1262 min_new = NewSize;
1263 }
1264 if (max_heap > min_new && min_heap_size() > min_new) {
1265 // Unless explicitly requested otherwise, make young gen
1266 // at least min_new, and at most preferred_max_new_size.
1267 if (FLAG_IS_DEFAULT(NewSize)) {
1268 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1269 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1270 if (PrintGCDetails && Verbose) {
1271 // Too early to use gclog_or_tty
1272 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1273 }
1274 }
1275 // Unless explicitly requested otherwise, size old gen
1276 // so it's NewRatio x of NewSize.
1277 if (FLAG_IS_DEFAULT(OldSize)) {
1278 if (max_heap > NewSize) {
1279 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1280 if (PrintGCDetails && Verbose) {
1281 // Too early to use gclog_or_tty
1282 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1283 }
1284 }
1285 }
1286 }
1287 }
1288 // Unless explicitly requested otherwise, definitely
1289 // promote all objects surviving "tenuring_default" scavenges.
1290 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1291 FLAG_IS_DEFAULT(SurvivorRatio)) {
1292 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1293 }
1294 // If we decided above (or user explicitly requested)
1295 // `promote all' (via MaxTenuringThreshold := 0),
1296 // prefer minuscule survivor spaces so as not to waste
1297 // space for (non-existent) survivors
1298 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1299 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1300 }
1301 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1302 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1303 // This is done in order to make ParNew+CMS configuration to work
1304 // with YoungPLABSize and OldPLABSize options.
1305 // See CR 6362902.
1306 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1307 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1308 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1309 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1310 // the value (either from the command line or ergonomics) of
1311 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1312 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1313 } else {
1314 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1315 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1316 // we'll let it to take precedence.
1317 jio_fprintf(defaultStream::error_stream(),
1318 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1319 " options are specified for the CMS collector."
1320 " CMSParPromoteBlocksToClaim will take precedence.\n");
1321 }
1322 }
1323 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1324 // OldPLAB sizing manually turned off: Use a larger default setting,
1325 // unless it was manually specified. This is because a too-low value
1326 // will slow down scavenges.
1327 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1328 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1329 }
1330 }
1331 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1332 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1333 // If either of the static initialization defaults have changed, note this
1334 // modification.
1335 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1336 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1337 }
1338 if (PrintGCDetails && Verbose) {
1339 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1340 MarkStackSize / K, MarkStackSizeMax / K);
1341 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1342 }
1343 }
1344 #endif // INCLUDE_ALL_GCS
1345
1346 void set_object_alignment() {
1347 // Object alignment.
1348 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1349 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1350 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1351 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1352 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1353 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1354
1355 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1356 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1357
1358 // Oop encoding heap max
1359 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1360
1361 #if INCLUDE_ALL_GCS
1362 // Set CMS global values
1363 CompactibleFreeListSpace::set_cms_values();
1364 #endif // INCLUDE_ALL_GCS
1365 }
1366
1367 bool verify_object_alignment() {
1368 // Object alignment.
1369 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1370 jio_fprintf(defaultStream::error_stream(),
1371 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1372 (int)ObjectAlignmentInBytes);
1373 return false;
1374 }
1375 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1376 jio_fprintf(defaultStream::error_stream(),
1377 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1378 (int)ObjectAlignmentInBytes, BytesPerLong);
1379 return false;
1380 }
1381 // It does not make sense to have big object alignment
1382 // since a space lost due to alignment will be greater
1383 // then a saved space from compressed oops.
1384 if ((int)ObjectAlignmentInBytes > 256) {
1385 jio_fprintf(defaultStream::error_stream(),
1386 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1387 (int)ObjectAlignmentInBytes);
1388 return false;
1389 }
1390 // In case page size is very small.
1391 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1392 jio_fprintf(defaultStream::error_stream(),
1393 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1394 (int)ObjectAlignmentInBytes, os::vm_page_size());
1395 return false;
1396 }
1397 return true;
1398 }
1399
1400 uintx Arguments::max_heap_for_compressed_oops() {
1401 // Avoid sign flip.
1402 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1403 // We need to fit both the NULL page and the heap into the memory budget, while
1404 // keeping alignment constraints of the heap. To guarantee the latter, as the
1405 // NULL page is located before the heap, we pad the NULL page to the conservative
1406 // maximum alignment that the GC may ever impose upon the heap.
1407 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1408 _conservative_max_heap_alignment);
1409
1410 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1411 NOT_LP64(ShouldNotReachHere(); return 0);
1412 }
1413
1414 bool Arguments::should_auto_select_low_pause_collector() {
1415 if (UseAutoGCSelectPolicy &&
1416 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1417 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1418 if (PrintGCDetails) {
1419 // Cannot use gclog_or_tty yet.
1420 tty->print_cr("Automatic selection of the low pause collector"
1421 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1422 }
1423 return true;
1424 }
1425 return false;
1426 }
1427
1428 void Arguments::set_use_compressed_oops() {
1429 #ifndef ZERO
1430 #ifdef _LP64
1431 // MaxHeapSize is not set up properly at this point, but
1432 // the only value that can override MaxHeapSize if we are
1433 // to use UseCompressedOops is InitialHeapSize.
1434 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1435
1436 if (max_heap_size <= max_heap_for_compressed_oops()) {
1437 #if !defined(COMPILER1) || defined(TIERED)
1438 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1439 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1440 }
1441 #endif
1442 #ifdef _WIN64
1443 if (UseLargePages && UseCompressedOops) {
1444 // Cannot allocate guard pages for implicit checks in indexed addressing
1445 // mode, when large pages are specified on windows.
1446 // This flag could be switched ON if narrow oop base address is set to 0,
1447 // see code in Universe::initialize_heap().
1448 Universe::set_narrow_oop_use_implicit_null_checks(false);
1449 }
1450 #endif // _WIN64
1451 } else {
1452 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1453 warning("Max heap size too large for Compressed Oops");
1454 FLAG_SET_DEFAULT(UseCompressedOops, false);
1455 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1456 }
1457 }
1458 #endif // _LP64
1459 #endif // ZERO
1460 }
1461
1462
1463 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1464 // set_use_compressed_oops().
1465 void Arguments::set_use_compressed_klass_ptrs() {
1466 #ifndef ZERO
1467 #ifdef _LP64
1468 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1469 if (!UseCompressedOops) {
1470 if (UseCompressedClassPointers) {
1471 warning("UseCompressedClassPointers requires UseCompressedOops");
1472 }
1473 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1474 } else {
1475 // Turn on UseCompressedClassPointers too
1476 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1477 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1478 }
1479 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1480 if (UseCompressedClassPointers) {
1481 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1482 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1483 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1484 }
1485 }
1486 }
1487 #endif // _LP64
1488 #endif // !ZERO
1489 }
1490
1491 void Arguments::set_conservative_max_heap_alignment() {
1492 // The conservative maximum required alignment for the heap is the maximum of
1493 // the alignments imposed by several sources: any requirements from the heap
1494 // itself, the collector policy and the maximum page size we may run the VM
1495 // with.
1496 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1497 #if INCLUDE_ALL_GCS
1498 if (UseParallelGC) {
1499 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1500 } else if (UseG1GC) {
1501 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1502 }
1503 #endif // INCLUDE_ALL_GCS
1504 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(),
1505 CollectorPolicy::compute_heap_alignment());
1506 }
1507
1508 void Arguments::set_ergonomics_flags() {
1509
1510 if (os::is_server_class_machine()) {
1511 // If no other collector is requested explicitly,
1512 // let the VM select the collector based on
1513 // machine class and automatic selection policy.
1514 if (!UseSerialGC &&
1515 !UseConcMarkSweepGC &&
1516 !UseG1GC &&
1517 !UseParNewGC &&
1518 FLAG_IS_DEFAULT(UseParallelGC)) {
1519 if (should_auto_select_low_pause_collector()) {
1520 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1521 } else {
1522 FLAG_SET_ERGO(bool, UseParallelGC, true);
1523 }
1524 }
1525 }
1526 #ifdef COMPILER2
1527 // Shared spaces work fine with other GCs but causes bytecode rewriting
1528 // to be disabled, which hurts interpreter performance and decreases
1529 // server performance. When -server is specified, keep the default off
1530 // unless it is asked for. Future work: either add bytecode rewriting
1531 // at link time, or rewrite bytecodes in non-shared methods.
1532 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1533 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1534 no_shared_spaces();
1535 }
1536 #endif
1537
1538 set_conservative_max_heap_alignment();
1539
1540 #ifndef ZERO
1541 #ifdef _LP64
1542 set_use_compressed_oops();
1543
1544 // set_use_compressed_klass_ptrs() must be called after calling
1545 // set_use_compressed_oops().
1546 set_use_compressed_klass_ptrs();
1547
1548 // Also checks that certain machines are slower with compressed oops
1549 // in vm_version initialization code.
1550 #endif // _LP64
1551 #endif // !ZERO
1552 }
1553
1554 void Arguments::set_parallel_gc_flags() {
1555 assert(UseParallelGC || UseParallelOldGC, "Error");
1556 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1557 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1558 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1559 }
1560 FLAG_SET_DEFAULT(UseParallelGC, true);
1561
1562 // If no heap maximum was requested explicitly, use some reasonable fraction
1563 // of the physical memory, up to a maximum of 1GB.
1564 FLAG_SET_DEFAULT(ParallelGCThreads,
1565 Abstract_VM_Version::parallel_worker_threads());
1566 if (ParallelGCThreads == 0) {
1567 jio_fprintf(defaultStream::error_stream(),
1568 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1569 vm_exit(1);
1570 }
1571
1572 if (UseAdaptiveSizePolicy) {
1573 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1574 // unless the user actually sets these flags.
1575 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1576 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1577 }
1578 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1579 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1580 }
1581 }
1582
1583 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1584 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1585 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1586 // See CR 6362902 for details.
1587 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1588 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1589 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1590 }
1591 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1592 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1593 }
1594 }
1595
1596 if (UseParallelOldGC) {
1597 // Par compact uses lower default values since they are treated as
1598 // minimums. These are different defaults because of the different
1599 // interpretation and are not ergonomically set.
1600 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1601 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1602 }
1603 }
1604 }
1605
1606 void Arguments::set_g1_gc_flags() {
1607 assert(UseG1GC, "Error");
1608 #ifdef COMPILER1
1609 FastTLABRefill = false;
1610 #endif
1611 FLAG_SET_DEFAULT(ParallelGCThreads,
1612 Abstract_VM_Version::parallel_worker_threads());
1613 if (ParallelGCThreads == 0) {
1614 FLAG_SET_DEFAULT(ParallelGCThreads,
1615 Abstract_VM_Version::parallel_worker_threads());
1616 }
1617
1618 // MarkStackSize will be set (if it hasn't been set by the user)
1619 // when concurrent marking is initialized.
1620 // Its value will be based upon the number of parallel marking threads.
1621 // But we do set the maximum mark stack size here.
1622 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1623 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1624 }
1625
1626 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1627 // In G1, we want the default GC overhead goal to be higher than
1628 // say in PS. So we set it here to 10%. Otherwise the heap might
1629 // be expanded more aggressively than we would like it to. In
1630 // fact, even 10% seems to not be high enough in some cases
1631 // (especially small GC stress tests that the main thing they do
1632 // is allocation). We might consider increase it further.
1633 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1634 }
1635
1636 if (PrintGCDetails && Verbose) {
1637 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1638 MarkStackSize / K, MarkStackSizeMax / K);
1639 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1640 }
1641 }
1642
1643 julong Arguments::limit_by_allocatable_memory(julong limit) {
1644 julong max_allocatable;
1645 julong result = limit;
1646 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1647 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1648 }
1649 return result;
1650 }
1651
1652 void Arguments::set_heap_size() {
1653 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1654 // Deprecated flag
1655 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1656 }
1657
1658 const julong phys_mem =
1659 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1660 : (julong)MaxRAM;
1661
1662 // If the maximum heap size has not been set with -Xmx,
1663 // then set it as fraction of the size of physical memory,
1664 // respecting the maximum and minimum sizes of the heap.
1665 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1666 julong reasonable_max = phys_mem / MaxRAMFraction;
1667
1668 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1669 // Small physical memory, so use a minimum fraction of it for the heap
1670 reasonable_max = phys_mem / MinRAMFraction;
1671 } else {
1672 // Not-small physical memory, so require a heap at least
1673 // as large as MaxHeapSize
1674 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1675 }
1676 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1677 // Limit the heap size to ErgoHeapSizeLimit
1678 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1679 }
1680 if (UseCompressedOops) {
1681 // Limit the heap size to the maximum possible when using compressed oops
1682 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1683 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1684 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1685 // but it should be not less than default MaxHeapSize.
1686 max_coop_heap -= HeapBaseMinAddress;
1687 }
1688 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1689 }
1690 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1691
1692 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1693 // An initial heap size was specified on the command line,
1694 // so be sure that the maximum size is consistent. Done
1695 // after call to limit_by_allocatable_memory because that
1696 // method might reduce the allocation size.
1697 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1698 }
1699
1700 if (PrintGCDetails && Verbose) {
1701 // Cannot use gclog_or_tty yet.
1702 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1703 }
1704 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1705 }
1706
1707 // If the minimum or initial heap_size have not been set or requested to be set
1708 // ergonomically, set them accordingly.
1709 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1710 julong reasonable_minimum = (julong)(OldSize + NewSize);
1711
1712 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1713
1714 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1715
1716 if (InitialHeapSize == 0) {
1717 julong reasonable_initial = phys_mem / InitialRAMFraction;
1718
1719 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1720 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1721
1722 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1723
1724 if (PrintGCDetails && Verbose) {
1725 // Cannot use gclog_or_tty yet.
1726 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1727 }
1728 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1729 }
1730 // If the minimum heap size has not been set (via -Xms),
1731 // synchronize with InitialHeapSize to avoid errors with the default value.
1732 if (min_heap_size() == 0) {
1733 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1734 if (PrintGCDetails && Verbose) {
1735 // Cannot use gclog_or_tty yet.
1736 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1737 }
1738 }
1739 }
1740 }
1741
1742 // This must be called after ergonomics because we want bytecode rewriting
1743 // if the server compiler is used, or if UseSharedSpaces is disabled.
1744 void Arguments::set_bytecode_flags() {
1745 // Better not attempt to store into a read-only space.
1746 if (UseSharedSpaces) {
1747 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1748 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1749 }
1750
1751 if (!RewriteBytecodes) {
1752 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1753 }
1754 }
1755
1756 // Aggressive optimization flags -XX:+AggressiveOpts
1757 void Arguments::set_aggressive_opts_flags() {
1758 #ifdef COMPILER2
1759 if (AggressiveUnboxing) {
1760 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1761 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1762 } else if (!EliminateAutoBox) {
1763 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1764 AggressiveUnboxing = false;
1765 }
1766 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1767 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1768 } else if (!DoEscapeAnalysis) {
1769 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1770 AggressiveUnboxing = false;
1771 }
1772 }
1773 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1774 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1775 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1776 }
1777 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1778 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1779 }
1780
1781 // Feed the cache size setting into the JDK
1782 char buffer[1024];
1783 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1784 add_property(buffer);
1785 }
1786 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1787 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1788 }
1789 #endif
1790
1791 if (AggressiveOpts) {
1792 // Sample flag setting code
1793 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1794 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1795 // }
1796 }
1797 }
1798
1799 //===========================================================================================================
1800 // Parsing of java.compiler property
1801
1802 void Arguments::process_java_compiler_argument(char* arg) {
1803 // For backwards compatibility, Djava.compiler=NONE or ""
1804 // causes us to switch to -Xint mode UNLESS -Xdebug
1805 // is also specified.
1806 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1807 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1808 }
1809 }
1810
1811 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1812 _sun_java_launcher = strdup(launcher);
1813 if (strcmp("gamma", _sun_java_launcher) == 0) {
1814 _created_by_gamma_launcher = true;
1815 }
1816 }
1817
1818 bool Arguments::created_by_java_launcher() {
1819 assert(_sun_java_launcher != NULL, "property must have value");
1820 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1821 }
1822
1823 bool Arguments::created_by_gamma_launcher() {
1824 return _created_by_gamma_launcher;
1825 }
1826
1827 //===========================================================================================================
1828 // Parsing of main arguments
1829
1830 bool Arguments::verify_interval(uintx val, uintx min,
1831 uintx max, const char* name) {
1832 // Returns true iff value is in the inclusive interval [min..max]
1833 // false, otherwise.
1834 if (val >= min && val <= max) {
1835 return true;
1836 }
1837 jio_fprintf(defaultStream::error_stream(),
1838 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1839 " and " UINTX_FORMAT "\n",
1840 name, val, min, max);
1841 return false;
1842 }
1843
1844 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1845 // Returns true if given value is at least specified min threshold
1846 // false, otherwise.
1847 if (val >= min ) {
1848 return true;
1849 }
1850 jio_fprintf(defaultStream::error_stream(),
1851 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1852 name, val, min);
1853 return false;
1854 }
1855
1856 bool Arguments::verify_percentage(uintx value, const char* name) {
1857 if (is_percentage(value)) {
1858 return true;
1859 }
1860 jio_fprintf(defaultStream::error_stream(),
1861 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1862 name, value);
1863 return false;
1864 }
1865
1866 #if !INCLUDE_ALL_GCS
1867 #ifdef ASSERT
1868 static bool verify_serial_gc_flags() {
1869 return (UseSerialGC &&
1870 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1871 UseParallelGC || UseParallelOldGC));
1872 }
1873 #endif // ASSERT
1874 #endif // INCLUDE_ALL_GCS
1875
1876 // check if do gclog rotation
1877 // +UseGCLogFileRotation is a must,
1878 // no gc log rotation when log file not supplied or
1879 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1880 void check_gclog_consistency() {
1881 if (UseGCLogFileRotation) {
1882 if ((Arguments::gc_log_filename() == NULL) ||
1883 (NumberOfGCLogFiles == 0) ||
1884 (GCLogFileSize == 0)) {
1885 jio_fprintf(defaultStream::output_stream(),
1886 "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"
1887 "where num_of_file > 0 and num_of_size > 0\n"
1888 "GC log rotation is turned off\n");
1889 UseGCLogFileRotation = false;
1890 }
1891 }
1892
1893 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1894 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1895 jio_fprintf(defaultStream::output_stream(),
1896 "GCLogFileSize changed to minimum 8K\n");
1897 }
1898 }
1899
1900 // This function is called for -Xloggc:<filename>, it can be used
1901 // to check if a given file name(or string) conforms to the following
1902 // specification:
1903 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1904 // %p and %t only allowed once. We only limit usage of filename not path
1905 bool is_filename_valid(const char *file_name) {
1906 const char* p = file_name;
1907 char file_sep = os::file_separator()[0];
1908 const char* cp;
1909 // skip prefix path
1910 for (cp = file_name; *cp != '\0'; cp++) {
1911 if (*cp == '/' || *cp == file_sep) {
1912 p = cp + 1;
1913 }
1914 }
1915
1916 int count_p = 0;
1917 int count_t = 0;
1918 while (*p != '\0') {
1919 if ((*p >= '0' && *p <= '9') ||
1920 (*p >= 'A' && *p <= 'Z') ||
1921 (*p >= 'a' && *p <= 'z') ||
1922 *p == '-' ||
1923 *p == '_' ||
1924 *p == '.') {
1925 p++;
1926 continue;
1927 }
1928 if (*p == '%') {
1929 if(*(p + 1) == 'p') {
1930 p += 2;
1931 count_p ++;
1932 continue;
1933 }
1934 if (*(p + 1) == 't') {
1935 p += 2;
1936 count_t ++;
1937 continue;
1938 }
1939 }
1940 return false;
1941 }
1942 return count_p < 2 && count_t < 2;
1943 }
1944
1945 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
1946 if (!is_percentage(min_heap_free_ratio)) {
1947 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
1948 return false;
1949 }
1950 if (min_heap_free_ratio > MaxHeapFreeRatio) {
1951 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1952 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
1953 MaxHeapFreeRatio);
1954 return false;
1955 }
1956 return true;
1957 }
1958
1959 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
1960 if (!is_percentage(max_heap_free_ratio)) {
1961 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
1962 return false;
1963 }
1964 if (max_heap_free_ratio < MinHeapFreeRatio) {
1965 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
1966 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
1967 MinHeapFreeRatio);
1968 return false;
1969 }
1970 return true;
1971 }
1972
1973 // Check consistency of GC selection
1974 bool Arguments::check_gc_consistency() {
1975 check_gclog_consistency();
1976 bool status = true;
1977 // Ensure that the user has not selected conflicting sets
1978 // of collectors. [Note: this check is merely a user convenience;
1979 // collectors over-ride each other so that only a non-conflicting
1980 // set is selected; however what the user gets is not what they
1981 // may have expected from the combination they asked for. It's
1982 // better to reduce user confusion by not allowing them to
1983 // select conflicting combinations.
1984 uint i = 0;
1985 if (UseSerialGC) i++;
1986 if (UseConcMarkSweepGC || UseParNewGC) i++;
1987 if (UseParallelGC || UseParallelOldGC) i++;
1988 if (UseG1GC) i++;
1989 if (i > 1) {
1990 jio_fprintf(defaultStream::error_stream(),
1991 "Conflicting collector combinations in option list; "
1992 "please refer to the release notes for the combinations "
1993 "allowed\n");
1994 status = false;
1995 }
1996 return status;
1997 }
1998
1999 void Arguments::check_deprecated_gcs() {
2000 if (UseConcMarkSweepGC && !UseParNewGC) {
2001 warning("Using the DefNew young collector with the CMS collector is deprecated "
2002 "and will likely be removed in a future release");
2003 }
2004
2005 if (UseParNewGC && !UseConcMarkSweepGC) {
2006 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2007 // set up UseSerialGC properly, so that can't be used in the check here.
2008 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2009 "and will likely be removed in a future release");
2010 }
2011
2012 if (CMSIncrementalMode) {
2013 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2014 }
2015 }
2016
2017 void Arguments::check_deprecated_gc_flags() {
2018 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2019 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2020 "and will likely be removed in future release");
2021 }
2022 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2023 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2024 "Use MaxRAMFraction instead.");
2025 }
2026 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2027 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2028 }
2029 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2030 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2031 }
2032 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2033 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2034 }
2035 }
2036
2037 // Check stack pages settings
2038 bool Arguments::check_stack_pages()
2039 {
2040 bool status = true;
2041 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2042 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2043 // greater stack shadow pages can't generate instruction to bang stack
2044 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2045 return status;
2046 }
2047
2048 // Check the consistency of vm_init_args
2049 bool Arguments::check_vm_args_consistency() {
2050 // Method for adding checks for flag consistency.
2051 // The intent is to warn the user of all possible conflicts,
2052 // before returning an error.
2053 // Note: Needs platform-dependent factoring.
2054 bool status = true;
2055
2056 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2057 // builds so the cost of stack banging can be measured.
2058 #if (defined(PRODUCT) && defined(SOLARIS))
2059 if (!UseBoundThreads && !UseStackBanging) {
2060 jio_fprintf(defaultStream::error_stream(),
2061 "-UseStackBanging conflicts with -UseBoundThreads\n");
2062
2063 status = false;
2064 }
2065 #endif
2066
2067 if (TLABRefillWasteFraction == 0) {
2068 jio_fprintf(defaultStream::error_stream(),
2069 "TLABRefillWasteFraction should be a denominator, "
2070 "not " SIZE_FORMAT "\n",
2071 TLABRefillWasteFraction);
2072 status = false;
2073 }
2074
2075 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2076 "AdaptiveSizePolicyWeight");
2077 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2078
2079 // Divide by bucket size to prevent a large size from causing rollover when
2080 // calculating amount of memory needed to be allocated for the String table.
2081 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2082 (max_uintx / StringTable::bucket_size()), "StringTable size");
2083
2084 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2085 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2086
2087 {
2088 // Using "else if" below to avoid printing two error messages if min > max.
2089 // This will also prevent us from reporting both min>100 and max>100 at the
2090 // same time, but that is less annoying than printing two identical errors IMHO.
2091 FormatBuffer<80> err_msg("");
2092 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2093 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2094 status = false;
2095 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2096 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2097 status = false;
2098 }
2099 }
2100
2101 // Min/MaxMetaspaceFreeRatio
2102 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2103 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2104
2105 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2106 jio_fprintf(defaultStream::error_stream(),
2107 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2108 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2109 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2110 MinMetaspaceFreeRatio,
2111 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2112 MaxMetaspaceFreeRatio);
2113 status = false;
2114 }
2115
2116 // Trying to keep 100% free is not practical
2117 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2118
2119 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2120 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2121 }
2122
2123 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2124 // Settings to encourage splitting.
2125 if (!FLAG_IS_CMDLINE(NewRatio)) {
2126 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2127 }
2128 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2129 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2130 }
2131 }
2132
2133 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2134 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2135 if (GCTimeLimit == 100) {
2136 // Turn off gc-overhead-limit-exceeded checks
2137 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2138 }
2139
2140 status = status && check_gc_consistency();
2141 status = status && check_stack_pages();
2142
2143 if (CMSIncrementalMode) {
2144 if (!UseConcMarkSweepGC) {
2145 jio_fprintf(defaultStream::error_stream(),
2146 "error: invalid argument combination.\n"
2147 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2148 "selected in order\nto use CMSIncrementalMode.\n");
2149 status = false;
2150 } else {
2151 status = status && verify_percentage(CMSIncrementalDutyCycle,
2152 "CMSIncrementalDutyCycle");
2153 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2154 "CMSIncrementalDutyCycleMin");
2155 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2156 "CMSIncrementalSafetyFactor");
2157 status = status && verify_percentage(CMSIncrementalOffset,
2158 "CMSIncrementalOffset");
2159 status = status && verify_percentage(CMSExpAvgFactor,
2160 "CMSExpAvgFactor");
2161 // If it was not set on the command line, set
2162 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2163 if (CMSInitiatingOccupancyFraction < 0) {
2164 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2165 }
2166 }
2167 }
2168
2169 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2170 // insists that we hold the requisite locks so that the iteration is
2171 // MT-safe. For the verification at start-up and shut-down, we don't
2172 // yet have a good way of acquiring and releasing these locks,
2173 // which are not visible at the CollectedHeap level. We want to
2174 // be able to acquire these locks and then do the iteration rather
2175 // than just disable the lock verification. This will be fixed under
2176 // bug 4788986.
2177 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2178 if (VerifyDuringStartup) {
2179 warning("Heap verification at start-up disabled "
2180 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2181 VerifyDuringStartup = false; // Disable verification at start-up
2182 }
2183
2184 if (VerifyBeforeExit) {
2185 warning("Heap verification at shutdown disabled "
2186 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2187 VerifyBeforeExit = false; // Disable verification at shutdown
2188 }
2189 }
2190
2191 // Note: only executed in non-PRODUCT mode
2192 if (!UseAsyncConcMarkSweepGC &&
2193 (ExplicitGCInvokesConcurrent ||
2194 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2195 jio_fprintf(defaultStream::error_stream(),
2196 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2197 " with -UseAsyncConcMarkSweepGC");
2198 status = false;
2199 }
2200
2201 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2202
2203 #if INCLUDE_ALL_GCS
2204 if (UseG1GC) {
2205 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2206 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2207 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2208
2209 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2210 "InitiatingHeapOccupancyPercent");
2211 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2212 "G1RefProcDrainInterval");
2213 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2214 "G1ConcMarkStepDurationMillis");
2215 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2216 "G1ConcRSHotCardLimit");
2217 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2218 "G1ConcRSLogCacheSize");
2219 }
2220 if (UseConcMarkSweepGC) {
2221 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2222 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2223 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2224 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2225
2226 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2227
2228 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2229 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2230 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2231
2232 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2233
2234 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2235 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2236
2237 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2238 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2239 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2240
2241 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2242
2243 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2244
2245 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2246 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2247 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2248 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2249 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2250 }
2251
2252 if (UseParallelGC || UseParallelOldGC) {
2253 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2254 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2255
2256 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2257 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2258
2259 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2260 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2261
2262 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2263
2264 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2265 }
2266 #endif // INCLUDE_ALL_GCS
2267
2268 status = status && verify_interval(RefDiscoveryPolicy,
2269 ReferenceProcessor::DiscoveryPolicyMin,
2270 ReferenceProcessor::DiscoveryPolicyMax,
2271 "RefDiscoveryPolicy");
2272
2273 // Limit the lower bound of this flag to 1 as it is used in a division
2274 // expression.
2275 status = status && verify_interval(TLABWasteTargetPercent,
2276 1, 100, "TLABWasteTargetPercent");
2277
2278 status = status && verify_object_alignment();
2279
2280 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2281 "CompressedClassSpaceSize");
2282
2283 status = status && verify_interval(MarkStackSizeMax,
2284 1, (max_jint - 1), "MarkStackSizeMax");
2285 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2286
2287 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2288
2289 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2290
2291 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2292
2293 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2294 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2295
2296 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2297
2298 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2299 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2300 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2301 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2302
2303 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2304 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2305
2306 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2307 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2308 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2309
2310 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2311 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2312
2313 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2314 // just for that, so hardcode here.
2315 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2316 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2317 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2318 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2319
2320 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2321
2322 if (PrintNMTStatistics) {
2323 #if INCLUDE_NMT
2324 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2325 #endif // INCLUDE_NMT
2326 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2327 PrintNMTStatistics = false;
2328 #if INCLUDE_NMT
2329 }
2330 #endif
2331 }
2332
2333 // Need to limit the extent of the padding to reasonable size.
2334 // 8K is well beyond the reasonable HW cache line size, even with the
2335 // aggressive prefetching, while still leaving the room for segregating
2336 // among the distinct pages.
2337 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2338 jio_fprintf(defaultStream::error_stream(),
2339 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2340 ContendedPaddingWidth, 0, 8192);
2341 status = false;
2342 }
2343
2344 // Need to enforce the padding not to break the existing field alignments.
2345 // It is sufficient to check against the largest type size.
2346 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2347 jio_fprintf(defaultStream::error_stream(),
2348 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2349 ContendedPaddingWidth, BytesPerLong);
2350 status = false;
2351 }
2352
2353 // Check lower bounds of the code cache
2354 // Template Interpreter code is approximately 3X larger in debug builds.
2355 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2356 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2357 jio_fprintf(defaultStream::error_stream(),
2358 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2359 os::vm_page_size()/K);
2360 status = false;
2361 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2362 jio_fprintf(defaultStream::error_stream(),
2363 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2364 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2365 status = false;
2366 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2367 jio_fprintf(defaultStream::error_stream(),
2368 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2369 min_code_cache_size/K);
2370 status = false;
2371 } else if (ReservedCodeCacheSize > 2*G) {
2372 // Code cache size larger than MAXINT is not supported.
2373 jio_fprintf(defaultStream::error_stream(),
2374 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2375 (2*G)/M);
2376 status = false;
2377 }
2378
2379 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2380 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2381
2382 return status;
2383 }
2384
2385 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2386 const char* option_type) {
2387 if (ignore) return false;
2388
2389 const char* spacer = " ";
2390 if (option_type == NULL) {
2391 option_type = ++spacer; // Set both to the empty string.
2392 }
2393
2394 if (os::obsolete_option(option)) {
2395 jio_fprintf(defaultStream::error_stream(),
2396 "Obsolete %s%soption: %s\n", option_type, spacer,
2397 option->optionString);
2398 return false;
2399 } else {
2400 jio_fprintf(defaultStream::error_stream(),
2401 "Unrecognized %s%soption: %s\n", option_type, spacer,
2402 option->optionString);
2403 return true;
2404 }
2405 }
2406
2407 static const char* user_assertion_options[] = {
2408 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2409 };
2410
2411 static const char* system_assertion_options[] = {
2412 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2413 };
2414
2415 // Return true if any of the strings in null-terminated array 'names' matches.
2416 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2417 // the option must match exactly.
2418 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2419 bool tail_allowed) {
2420 for (/* empty */; *names != NULL; ++names) {
2421 if (match_option(option, *names, tail)) {
2422 if (**tail == '\0' || tail_allowed && **tail == ':') {
2423 return true;
2424 }
2425 }
2426 }
2427 return false;
2428 }
2429
2430 bool Arguments::parse_uintx(const char* value,
2431 uintx* uintx_arg,
2432 uintx min_size) {
2433
2434 // Check the sign first since atomull() parses only unsigned values.
2435 bool value_is_positive = !(*value == '-');
2436
2437 if (value_is_positive) {
2438 julong n;
2439 bool good_return = atomull(value, &n);
2440 if (good_return) {
2441 bool above_minimum = n >= min_size;
2442 bool value_is_too_large = n > max_uintx;
2443
2444 if (above_minimum && !value_is_too_large) {
2445 *uintx_arg = n;
2446 return true;
2447 }
2448 }
2449 }
2450 return false;
2451 }
2452
2453 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2454 julong* long_arg,
2455 julong min_size) {
2456 if (!atomull(s, long_arg)) return arg_unreadable;
2457 return check_memory_size(*long_arg, min_size);
2458 }
2459
2460 // Parse JavaVMInitArgs structure
2461
2462 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2463 // For components of the system classpath.
2464 SysClassPath scp(Arguments::get_sysclasspath());
2465 bool scp_assembly_required = false;
2466
2467 // Save default settings for some mode flags
2468 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2469 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2470 Arguments::_ClipInlining = ClipInlining;
2471 Arguments::_BackgroundCompilation = BackgroundCompilation;
2472
2473 // Setup flags for mixed which is the default
2474 set_mode_flags(_mixed);
2475
2476 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2477 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2478 if (result != JNI_OK) {
2479 return result;
2480 }
2481
2482 // Parse JavaVMInitArgs structure passed in
2483 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2484 if (result != JNI_OK) {
2485 return result;
2486 }
2487
2488 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2489 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2490 if (result != JNI_OK) {
2491 return result;
2492 }
2493
2494 // Do final processing now that all arguments have been parsed
2495 result = finalize_vm_init_args(&scp, scp_assembly_required);
2496 if (result != JNI_OK) {
2497 return result;
2498 }
2499
2500 return JNI_OK;
2501 }
2502
2503 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2504 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2505 // are dealing with -agentpath (case where name is a path), otherwise with
2506 // -agentlib
2507 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2508 char *_name;
2509 const char *_hprof = "hprof", *_jdwp = "jdwp";
2510 size_t _len_hprof, _len_jdwp, _len_prefix;
2511
2512 if (is_path) {
2513 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2514 return false;
2515 }
2516
2517 _name++; // skip past last path separator
2518 _len_prefix = strlen(JNI_LIB_PREFIX);
2519
2520 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2521 return false;
2522 }
2523
2524 _name += _len_prefix;
2525 _len_hprof = strlen(_hprof);
2526 _len_jdwp = strlen(_jdwp);
2527
2528 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2529 _name += _len_hprof;
2530 }
2531 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2532 _name += _len_jdwp;
2533 }
2534 else {
2535 return false;
2536 }
2537
2538 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2539 return false;
2540 }
2541
2542 return true;
2543 }
2544
2545 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2546 return true;
2547 }
2548
2549 return false;
2550 }
2551
2552 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2553 SysClassPath* scp_p,
2554 bool* scp_assembly_required_p,
2555 Flag::Flags origin) {
2556 // Remaining part of option string
2557 const char* tail;
2558
2559 // iterate over arguments
2560 for (int index = 0; index < args->nOptions; index++) {
2561 bool is_absolute_path = false; // for -agentpath vs -agentlib
2562
2563 const JavaVMOption* option = args->options + index;
2564
2565 if (!match_option(option, "-Djava.class.path", &tail) &&
2566 !match_option(option, "-Dsun.java.command", &tail) &&
2567 !match_option(option, "-Dsun.java.launcher", &tail)) {
2568
2569 // add all jvm options to the jvm_args string. This string
2570 // is used later to set the java.vm.args PerfData string constant.
2571 // the -Djava.class.path and the -Dsun.java.command options are
2572 // omitted from jvm_args string as each have their own PerfData
2573 // string constant object.
2574 build_jvm_args(option->optionString);
2575 }
2576
2577 // -verbose:[class/gc/jni]
2578 if (match_option(option, "-verbose", &tail)) {
2579 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2580 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2581 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2582 } else if (!strcmp(tail, ":gc")) {
2583 FLAG_SET_CMDLINE(bool, PrintGC, true);
2584 } else if (!strcmp(tail, ":jni")) {
2585 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2586 }
2587 // -da / -ea / -disableassertions / -enableassertions
2588 // These accept an optional class/package name separated by a colon, e.g.,
2589 // -da:java.lang.Thread.
2590 } else if (match_option(option, user_assertion_options, &tail, true)) {
2591 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2592 if (*tail == '\0') {
2593 JavaAssertions::setUserClassDefault(enable);
2594 } else {
2595 assert(*tail == ':', "bogus match by match_option()");
2596 JavaAssertions::addOption(tail + 1, enable);
2597 }
2598 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2599 } else if (match_option(option, system_assertion_options, &tail, false)) {
2600 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2601 JavaAssertions::setSystemClassDefault(enable);
2602 // -bootclasspath:
2603 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2604 scp_p->reset_path(tail);
2605 *scp_assembly_required_p = true;
2606 // -bootclasspath/a:
2607 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2608 scp_p->add_suffix(tail);
2609 *scp_assembly_required_p = true;
2610 // -bootclasspath/p:
2611 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2612 scp_p->add_prefix(tail);
2613 *scp_assembly_required_p = true;
2614 // -Xrun
2615 } else if (match_option(option, "-Xrun", &tail)) {
2616 if (tail != NULL) {
2617 const char* pos = strchr(tail, ':');
2618 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2619 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2620 name[len] = '\0';
2621
2622 char *options = NULL;
2623 if(pos != NULL) {
2624 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2625 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2626 }
2627 #if !INCLUDE_JVMTI
2628 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2629 jio_fprintf(defaultStream::error_stream(),
2630 "Profiling and debugging agents are not supported in this VM\n");
2631 return JNI_ERR;
2632 }
2633 #endif // !INCLUDE_JVMTI
2634 add_init_library(name, options);
2635 }
2636 // -agentlib and -agentpath
2637 } else if (match_option(option, "-agentlib:", &tail) ||
2638 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2639 if(tail != NULL) {
2640 const char* pos = strchr(tail, '=');
2641 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2642 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2643 name[len] = '\0';
2644
2645 char *options = NULL;
2646 if(pos != NULL) {
2647 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2648 }
2649 #if !INCLUDE_JVMTI
2650 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2651 jio_fprintf(defaultStream::error_stream(),
2652 "Profiling and debugging agents are not supported in this VM\n");
2653 return JNI_ERR;
2654 }
2655 #endif // !INCLUDE_JVMTI
2656 add_init_agent(name, options, is_absolute_path);
2657 }
2658 // -javaagent
2659 } else if (match_option(option, "-javaagent:", &tail)) {
2660 #if !INCLUDE_JVMTI
2661 jio_fprintf(defaultStream::error_stream(),
2662 "Instrumentation agents are not supported in this VM\n");
2663 return JNI_ERR;
2664 #else
2665 if(tail != NULL) {
2666 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2667 add_init_agent("instrument", options, false);
2668 }
2669 #endif // !INCLUDE_JVMTI
2670 // -Xnoclassgc
2671 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2672 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2673 // -Xincgc: i-CMS
2674 } else if (match_option(option, "-Xincgc", &tail)) {
2675 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2676 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2677 // -Xnoincgc: no i-CMS
2678 } else if (match_option(option, "-Xnoincgc", &tail)) {
2679 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2680 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2681 // -Xconcgc
2682 } else if (match_option(option, "-Xconcgc", &tail)) {
2683 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2684 // -Xnoconcgc
2685 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2686 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2687 // -Xbatch
2688 } else if (match_option(option, "-Xbatch", &tail)) {
2689 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2690 // -Xmn for compatibility with other JVM vendors
2691 } else if (match_option(option, "-Xmn", &tail)) {
2692 julong long_initial_young_size = 0;
2693 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2694 if (errcode != arg_in_range) {
2695 jio_fprintf(defaultStream::error_stream(),
2696 "Invalid initial young generation size: %s\n", option->optionString);
2697 describe_range_error(errcode);
2698 return JNI_EINVAL;
2699 }
2700 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2701 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2702 // -Xms
2703 } else if (match_option(option, "-Xms", &tail)) {
2704 julong long_initial_heap_size = 0;
2705 // an initial heap size of 0 means automatically determine
2706 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2707 if (errcode != arg_in_range) {
2708 jio_fprintf(defaultStream::error_stream(),
2709 "Invalid initial heap size: %s\n", option->optionString);
2710 describe_range_error(errcode);
2711 return JNI_EINVAL;
2712 }
2713 set_min_heap_size((uintx)long_initial_heap_size);
2714 // Currently the minimum size and the initial heap sizes are the same.
2715 // Can be overridden with -XX:InitialHeapSize.
2716 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2717 // -Xmx
2718 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2719 julong long_max_heap_size = 0;
2720 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2721 if (errcode != arg_in_range) {
2722 jio_fprintf(defaultStream::error_stream(),
2723 "Invalid maximum heap size: %s\n", option->optionString);
2724 describe_range_error(errcode);
2725 return JNI_EINVAL;
2726 }
2727 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2728 // Xmaxf
2729 } else if (match_option(option, "-Xmaxf", &tail)) {
2730 char* err;
2731 int maxf = (int)(strtod(tail, &err) * 100);
2732 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2733 jio_fprintf(defaultStream::error_stream(),
2734 "Bad max heap free percentage size: %s\n",
2735 option->optionString);
2736 return JNI_EINVAL;
2737 } else {
2738 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2739 }
2740 // Xminf
2741 } else if (match_option(option, "-Xminf", &tail)) {
2742 char* err;
2743 int minf = (int)(strtod(tail, &err) * 100);
2744 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2745 jio_fprintf(defaultStream::error_stream(),
2746 "Bad min heap free percentage size: %s\n",
2747 option->optionString);
2748 return JNI_EINVAL;
2749 } else {
2750 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2751 }
2752 // -Xss
2753 } else if (match_option(option, "-Xss", &tail)) {
2754 julong long_ThreadStackSize = 0;
2755 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2756 if (errcode != arg_in_range) {
2757 jio_fprintf(defaultStream::error_stream(),
2758 "Invalid thread stack size: %s\n", option->optionString);
2759 describe_range_error(errcode);
2760 return JNI_EINVAL;
2761 }
2762 // Internally track ThreadStackSize in units of 1024 bytes.
2763 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2764 round_to((int)long_ThreadStackSize, K) / K);
2765 // -Xoss
2766 } else if (match_option(option, "-Xoss", &tail)) {
2767 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2768 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2769 julong long_CodeCacheExpansionSize = 0;
2770 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2771 if (errcode != arg_in_range) {
2772 jio_fprintf(defaultStream::error_stream(),
2773 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2774 os::vm_page_size()/K);
2775 return JNI_EINVAL;
2776 }
2777 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2778 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2779 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2780 julong long_ReservedCodeCacheSize = 0;
2781
2782 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2783 if (errcode != arg_in_range) {
2784 jio_fprintf(defaultStream::error_stream(),
2785 "Invalid maximum code cache size: %s.\n", option->optionString);
2786 return JNI_EINVAL;
2787 }
2788 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2789 //-XX:IncreaseFirstTierCompileThresholdAt=
2790 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2791 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2792 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2793 jio_fprintf(defaultStream::error_stream(),
2794 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2795 option->optionString);
2796 return JNI_EINVAL;
2797 }
2798 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2799 // -green
2800 } else if (match_option(option, "-green", &tail)) {
2801 jio_fprintf(defaultStream::error_stream(),
2802 "Green threads support not available\n");
2803 return JNI_EINVAL;
2804 // -native
2805 } else if (match_option(option, "-native", &tail)) {
2806 // HotSpot always uses native threads, ignore silently for compatibility
2807 // -Xsqnopause
2808 } else if (match_option(option, "-Xsqnopause", &tail)) {
2809 // EVM option, ignore silently for compatibility
2810 // -Xrs
2811 } else if (match_option(option, "-Xrs", &tail)) {
2812 // Classic/EVM option, new functionality
2813 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2814 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2815 // change default internal VM signals used - lower case for back compat
2816 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2817 // -Xoptimize
2818 } else if (match_option(option, "-Xoptimize", &tail)) {
2819 // EVM option, ignore silently for compatibility
2820 // -Xprof
2821 } else if (match_option(option, "-Xprof", &tail)) {
2822 #if INCLUDE_FPROF
2823 _has_profile = true;
2824 #else // INCLUDE_FPROF
2825 jio_fprintf(defaultStream::error_stream(),
2826 "Flat profiling is not supported in this VM.\n");
2827 return JNI_ERR;
2828 #endif // INCLUDE_FPROF
2829 // -Xconcurrentio
2830 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2831 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2832 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2833 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2834 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2835 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2836
2837 // -Xinternalversion
2838 } else if (match_option(option, "-Xinternalversion", &tail)) {
2839 jio_fprintf(defaultStream::output_stream(), "%s\n",
2840 VM_Version::internal_vm_info_string());
2841 vm_exit(0);
2842 #ifndef PRODUCT
2843 // -Xprintflags
2844 } else if (match_option(option, "-Xprintflags", &tail)) {
2845 CommandLineFlags::printFlags(tty, false);
2846 vm_exit(0);
2847 #endif
2848 // -D
2849 } else if (match_option(option, "-D", &tail)) {
2850 if (!add_property(tail)) {
2851 return JNI_ENOMEM;
2852 }
2853 // Out of the box management support
2854 if (match_option(option, "-Dcom.sun.management", &tail)) {
2855 #if INCLUDE_MANAGEMENT
2856 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2857 #else
2858 jio_fprintf(defaultStream::output_stream(),
2859 "-Dcom.sun.management is not supported in this VM.\n");
2860 return JNI_ERR;
2861 #endif
2862 }
2863 // -Xint
2864 } else if (match_option(option, "-Xint", &tail)) {
2865 set_mode_flags(_int);
2866 // -Xmixed
2867 } else if (match_option(option, "-Xmixed", &tail)) {
2868 set_mode_flags(_mixed);
2869 // -Xcomp
2870 } else if (match_option(option, "-Xcomp", &tail)) {
2871 // for testing the compiler; turn off all flags that inhibit compilation
2872 set_mode_flags(_comp);
2873 // -Xshare:dump
2874 } else if (match_option(option, "-Xshare:dump", &tail)) {
2875 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2876 set_mode_flags(_int); // Prevent compilation, which creates objects
2877 // -Xshare:on
2878 } else if (match_option(option, "-Xshare:on", &tail)) {
2879 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2880 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2881 // -Xshare:auto
2882 } else if (match_option(option, "-Xshare:auto", &tail)) {
2883 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2884 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2885 // -Xshare:off
2886 } else if (match_option(option, "-Xshare:off", &tail)) {
2887 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2888 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2889 // -Xverify
2890 } else if (match_option(option, "-Xverify", &tail)) {
2891 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2892 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2893 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2894 } else if (strcmp(tail, ":remote") == 0) {
2895 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2896 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2897 } else if (strcmp(tail, ":none") == 0) {
2898 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2899 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2900 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2901 return JNI_EINVAL;
2902 }
2903 // -Xdebug
2904 } else if (match_option(option, "-Xdebug", &tail)) {
2905 // note this flag has been used, then ignore
2906 set_xdebug_mode(true);
2907 // -Xnoagent
2908 } else if (match_option(option, "-Xnoagent", &tail)) {
2909 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2910 } else if (match_option(option, "-Xboundthreads", &tail)) {
2911 // Bind user level threads to kernel threads (Solaris only)
2912 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2913 } else if (match_option(option, "-Xloggc:", &tail)) {
2914 // Redirect GC output to the file. -Xloggc:<filename>
2915 // ostream_init_log(), when called will use this filename
2916 // to initialize a fileStream.
2917 _gc_log_filename = strdup(tail);
2918 if (!is_filename_valid(_gc_log_filename)) {
2919 jio_fprintf(defaultStream::output_stream(),
2920 "Invalid file name for use with -Xloggc: Filename can only contain the "
2921 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2922 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2923 return JNI_EINVAL;
2924 }
2925 FLAG_SET_CMDLINE(bool, PrintGC, true);
2926 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2927
2928 // JNI hooks
2929 } else if (match_option(option, "-Xcheck", &tail)) {
2930 if (!strcmp(tail, ":jni")) {
2931 #if !INCLUDE_JNI_CHECK
2932 warning("JNI CHECKING is not supported in this VM");
2933 #else
2934 CheckJNICalls = true;
2935 #endif // INCLUDE_JNI_CHECK
2936 } else if (is_bad_option(option, args->ignoreUnrecognized,
2937 "check")) {
2938 return JNI_EINVAL;
2939 }
2940 } else if (match_option(option, "vfprintf", &tail)) {
2941 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2942 } else if (match_option(option, "exit", &tail)) {
2943 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2944 } else if (match_option(option, "abort", &tail)) {
2945 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2946 // -XX:+AggressiveHeap
2947 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2948
2949 // This option inspects the machine and attempts to set various
2950 // parameters to be optimal for long-running, memory allocation
2951 // intensive jobs. It is intended for machines with large
2952 // amounts of cpu and memory.
2953
2954 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2955 // VM, but we may not be able to represent the total physical memory
2956 // available (like having 8gb of memory on a box but using a 32bit VM).
2957 // Thus, we need to make sure we're using a julong for intermediate
2958 // calculations.
2959 julong initHeapSize;
2960 julong total_memory = os::physical_memory();
2961
2962 if (total_memory < (julong)256*M) {
2963 jio_fprintf(defaultStream::error_stream(),
2964 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2965 vm_exit(1);
2966 }
2967
2968 // The heap size is half of available memory, or (at most)
2969 // all of possible memory less 160mb (leaving room for the OS
2970 // when using ISM). This is the maximum; because adaptive sizing
2971 // is turned on below, the actual space used may be smaller.
2972
2973 initHeapSize = MIN2(total_memory / (julong)2,
2974 total_memory - (julong)160*M);
2975
2976 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2977
2978 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2979 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2980 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2981 // Currently the minimum size and the initial heap sizes are the same.
2982 set_min_heap_size(initHeapSize);
2983 }
2984 if (FLAG_IS_DEFAULT(NewSize)) {
2985 // Make the young generation 3/8ths of the total heap.
2986 FLAG_SET_CMDLINE(uintx, NewSize,
2987 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2988 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2989 }
2990
2991 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2992 FLAG_SET_DEFAULT(UseLargePages, true);
2993 #endif
2994
2995 // Increase some data structure sizes for efficiency
2996 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2997 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2998 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2999
3000 // See the OldPLABSize comment below, but replace 'after promotion'
3001 // with 'after copying'. YoungPLABSize is the size of the survivor
3002 // space per-gc-thread buffers. The default is 4kw.
3003 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3004
3005 // OldPLABSize is the size of the buffers in the old gen that
3006 // UseParallelGC uses to promote live data that doesn't fit in the
3007 // survivor spaces. At any given time, there's one for each gc thread.
3008 // The default size is 1kw. These buffers are rarely used, since the
3009 // survivor spaces are usually big enough. For specjbb, however, there
3010 // are occasions when there's lots of live data in the young gen
3011 // and we end up promoting some of it. We don't have a definite
3012 // explanation for why bumping OldPLABSize helps, but the theory
3013 // is that a bigger PLAB results in retaining something like the
3014 // original allocation order after promotion, which improves mutator
3015 // locality. A minor effect may be that larger PLABs reduce the
3016 // number of PLAB allocation events during gc. The value of 8kw
3017 // was arrived at by experimenting with specjbb.
3018 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3019
3020 // Enable parallel GC and adaptive generation sizing
3021 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3022 FLAG_SET_DEFAULT(ParallelGCThreads,
3023 Abstract_VM_Version::parallel_worker_threads());
3024
3025 // Encourage steady state memory management
3026 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3027
3028 // This appears to improve mutator locality
3029 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3030
3031 // Get around early Solaris scheduling bug
3032 // (affinity vs other jobs on system)
3033 // but disallow DR and offlining (5008695).
3034 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3035
3036 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3037 // The last option must always win.
3038 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3039 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3040 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3041 // The last option must always win.
3042 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3043 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3044 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3045 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3046 jio_fprintf(defaultStream::error_stream(),
3047 "Please use CMSClassUnloadingEnabled in place of "
3048 "CMSPermGenSweepingEnabled in the future\n");
3049 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3050 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3051 jio_fprintf(defaultStream::error_stream(),
3052 "Please use -XX:+UseGCOverheadLimit in place of "
3053 "-XX:+UseGCTimeLimit in the future\n");
3054 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3055 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3056 jio_fprintf(defaultStream::error_stream(),
3057 "Please use -XX:-UseGCOverheadLimit in place of "
3058 "-XX:-UseGCTimeLimit in the future\n");
3059 // The TLE options are for compatibility with 1.3 and will be
3060 // removed without notice in a future release. These options
3061 // are not to be documented.
3062 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3063 // No longer used.
3064 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3065 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3066 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3067 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3068 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3069 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3070 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3071 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3072 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3073 // No longer used.
3074 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3075 julong long_tlab_size = 0;
3076 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3077 if (errcode != arg_in_range) {
3078 jio_fprintf(defaultStream::error_stream(),
3079 "Invalid TLAB size: %s\n", option->optionString);
3080 describe_range_error(errcode);
3081 return JNI_EINVAL;
3082 }
3083 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3084 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3085 // No longer used.
3086 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3087 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3088 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3089 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3090 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3091 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3092 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3093 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3094 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3095 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3096 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3097 #if defined(DTRACE_ENABLED)
3098 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3099 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3100 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3101 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3102 #else // defined(DTRACE_ENABLED)
3103 jio_fprintf(defaultStream::error_stream(),
3104 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3105 return JNI_EINVAL;
3106 #endif // defined(DTRACE_ENABLED)
3107 #ifdef ASSERT
3108 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3109 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3110 // disable scavenge before parallel mark-compact
3111 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3112 #endif
3113 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3114 julong cms_blocks_to_claim = (julong)atol(tail);
3115 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3116 jio_fprintf(defaultStream::error_stream(),
3117 "Please use -XX:OldPLABSize in place of "
3118 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3119 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3120 julong cms_blocks_to_claim = (julong)atol(tail);
3121 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3122 jio_fprintf(defaultStream::error_stream(),
3123 "Please use -XX:OldPLABSize in place of "
3124 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3125 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3126 julong old_plab_size = 0;
3127 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3128 if (errcode != arg_in_range) {
3129 jio_fprintf(defaultStream::error_stream(),
3130 "Invalid old PLAB size: %s\n", option->optionString);
3131 describe_range_error(errcode);
3132 return JNI_EINVAL;
3133 }
3134 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3135 jio_fprintf(defaultStream::error_stream(),
3136 "Please use -XX:OldPLABSize in place of "
3137 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3138 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3139 julong young_plab_size = 0;
3140 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3141 if (errcode != arg_in_range) {
3142 jio_fprintf(defaultStream::error_stream(),
3143 "Invalid young PLAB size: %s\n", option->optionString);
3144 describe_range_error(errcode);
3145 return JNI_EINVAL;
3146 }
3147 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3148 jio_fprintf(defaultStream::error_stream(),
3149 "Please use -XX:YoungPLABSize in place of "
3150 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3151 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3152 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3153 julong stack_size = 0;
3154 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3155 if (errcode != arg_in_range) {
3156 jio_fprintf(defaultStream::error_stream(),
3157 "Invalid mark stack size: %s\n", option->optionString);
3158 describe_range_error(errcode);
3159 return JNI_EINVAL;
3160 }
3161 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3162 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3163 julong max_stack_size = 0;
3164 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3165 if (errcode != arg_in_range) {
3166 jio_fprintf(defaultStream::error_stream(),
3167 "Invalid maximum mark stack size: %s\n",
3168 option->optionString);
3169 describe_range_error(errcode);
3170 return JNI_EINVAL;
3171 }
3172 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3173 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3174 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3175 uintx conc_threads = 0;
3176 if (!parse_uintx(tail, &conc_threads, 1)) {
3177 jio_fprintf(defaultStream::error_stream(),
3178 "Invalid concurrent threads: %s\n", option->optionString);
3179 return JNI_EINVAL;
3180 }
3181 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3182 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3183 julong max_direct_memory_size = 0;
3184 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3185 if (errcode != arg_in_range) {
3186 jio_fprintf(defaultStream::error_stream(),
3187 "Invalid maximum direct memory size: %s\n",
3188 option->optionString);
3189 describe_range_error(errcode);
3190 return JNI_EINVAL;
3191 }
3192 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3193 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3194 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3195 // away and will cause VM initialization failures!
3196 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3197 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3198 #if !INCLUDE_MANAGEMENT
3199 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3200 jio_fprintf(defaultStream::error_stream(),
3201 "ManagementServer is not supported in this VM.\n");
3202 return JNI_ERR;
3203 #endif // INCLUDE_MANAGEMENT
3204 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3205 // Skip -XX:Flags= since that case has already been handled
3206 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3207 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3208 return JNI_EINVAL;
3209 }
3210 }
3211 // Unknown option
3212 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3213 return JNI_ERR;
3214 }
3215 }
3216
3217 // Change the default value for flags which have different default values
3218 // when working with older JDKs.
3219 #ifdef LINUX
3220 if (JDK_Version::current().compare_major(6) <= 0 &&
3221 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3222 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3223 }
3224 #endif // LINUX
3225 return JNI_OK;
3226 }
3227
3228 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3229 // This must be done after all -D arguments have been processed.
3230 scp_p->expand_endorsed();
3231
3232 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3233 // Assemble the bootclasspath elements into the final path.
3234 Arguments::set_sysclasspath(scp_p->combined_path());
3235 }
3236
3237 // This must be done after all arguments have been processed.
3238 // java_compiler() true means set to "NONE" or empty.
3239 if (java_compiler() && !xdebug_mode()) {
3240 // For backwards compatibility, we switch to interpreted mode if
3241 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3242 // not specified.
3243 set_mode_flags(_int);
3244 }
3245 if (CompileThreshold == 0) {
3246 set_mode_flags(_int);
3247 }
3248
3249 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3250 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3251 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3252 }
3253
3254 #ifndef COMPILER2
3255 // Don't degrade server performance for footprint
3256 if (FLAG_IS_DEFAULT(UseLargePages) &&
3257 MaxHeapSize < LargePageHeapSizeThreshold) {
3258 // No need for large granularity pages w/small heaps.
3259 // Note that large pages are enabled/disabled for both the
3260 // Java heap and the code cache.
3261 FLAG_SET_DEFAULT(UseLargePages, false);
3262 }
3263
3264 #else
3265 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3266 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3267 }
3268 #endif
3269
3270 #ifndef TIERED
3271 // Tiered compilation is undefined.
3272 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3273 #endif
3274
3275 // If we are running in a headless jre, force java.awt.headless property
3276 // to be true unless the property has already been set.
3277 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3278 if (os::is_headless_jre()) {
3279 const char* headless = Arguments::get_property("java.awt.headless");
3280 if (headless == NULL) {
3281 char envbuffer[128];
3282 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3283 if (!add_property("java.awt.headless=true")) {
3284 return JNI_ENOMEM;
3285 }
3286 } else {
3287 char buffer[256];
3288 strcpy(buffer, "java.awt.headless=");
3289 strcat(buffer, envbuffer);
3290 if (!add_property(buffer)) {
3291 return JNI_ENOMEM;
3292 }
3293 }
3294 }
3295 }
3296
3297 if (!check_vm_args_consistency()) {
3298 return JNI_ERR;
3299 }
3300
3301 return JNI_OK;
3302 }
3303
3304 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3305 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3306 scp_assembly_required_p);
3307 }
3308
3309 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3310 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3311 scp_assembly_required_p);
3312 }
3313
3314 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3315 const int N_MAX_OPTIONS = 64;
3316 const int OPTION_BUFFER_SIZE = 1024;
3317 char buffer[OPTION_BUFFER_SIZE];
3318
3319 // The variable will be ignored if it exceeds the length of the buffer.
3320 // Don't check this variable if user has special privileges
3321 // (e.g. unix su command).
3322 if (os::getenv(name, buffer, sizeof(buffer)) &&
3323 !os::have_special_privileges()) {
3324 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3325 jio_fprintf(defaultStream::error_stream(),
3326 "Picked up %s: %s\n", name, buffer);
3327 char* rd = buffer; // pointer to the input string (rd)
3328 int i;
3329 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3330 while (isspace(*rd)) rd++; // skip whitespace
3331 if (*rd == 0) break; // we re done when the input string is read completely
3332
3333 // The output, option string, overwrites the input string.
3334 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3335 // input string (rd).
3336 char* wrt = rd;
3337
3338 options[i++].optionString = wrt; // Fill in option
3339 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3340 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3341 int quote = *rd; // matching quote to look for
3342 rd++; // don't copy open quote
3343 while (*rd != quote) { // include everything (even spaces) up until quote
3344 if (*rd == 0) { // string termination means unmatched string
3345 jio_fprintf(defaultStream::error_stream(),
3346 "Unmatched quote in %s\n", name);
3347 return JNI_ERR;
3348 }
3349 *wrt++ = *rd++; // copy to option string
3350 }
3351 rd++; // don't copy close quote
3352 } else {
3353 *wrt++ = *rd++; // copy to option string
3354 }
3355 }
3356 // Need to check if we're done before writing a NULL,
3357 // because the write could be to the byte that rd is pointing to.
3358 if (*rd++ == 0) {
3359 *wrt = 0;
3360 break;
3361 }
3362 *wrt = 0; // Zero terminate option
3363 }
3364 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3365 JavaVMInitArgs vm_args;
3366 vm_args.version = JNI_VERSION_1_2;
3367 vm_args.options = options;
3368 vm_args.nOptions = i;
3369 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3370
3371 if (PrintVMOptions) {
3372 const char* tail;
3373 for (int i = 0; i < vm_args.nOptions; i++) {
3374 const JavaVMOption *option = vm_args.options + i;
3375 if (match_option(option, "-XX:", &tail)) {
3376 logOption(tail);
3377 }
3378 }
3379 }
3380
3381 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3382 }
3383 return JNI_OK;
3384 }
3385
3386 void Arguments::set_shared_spaces_flags() {
3387 if (DumpSharedSpaces) {
3388 if (RequireSharedSpaces) {
3389 warning("cannot dump shared archive while using shared archive");
3390 }
3391 UseSharedSpaces = false;
3392 #ifdef _LP64
3393 if (!UseCompressedOops || !UseCompressedClassPointers) {
3394 vm_exit_during_initialization(
3395 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3396 }
3397 } else {
3398 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3399 if (!UseCompressedOops || !UseCompressedClassPointers) {
3400 no_shared_spaces();
3401 }
3402 #endif
3403 }
3404 }
3405
3406 #if !INCLUDE_ALL_GCS
3407 static void force_serial_gc() {
3408 FLAG_SET_DEFAULT(UseSerialGC, true);
3409 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3410 UNSUPPORTED_GC_OPTION(UseG1GC);
3411 UNSUPPORTED_GC_OPTION(UseParallelGC);
3412 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3413 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3414 UNSUPPORTED_GC_OPTION(UseParNewGC);
3415 }
3416 #endif // INCLUDE_ALL_GCS
3417
3418 // Sharing support
3419 // Construct the path to the archive
3420 static char* get_shared_archive_path() {
3421 char *shared_archive_path;
3422 if (SharedArchiveFile == NULL) {
3423 char jvm_path[JVM_MAXPATHLEN];
3424 os::jvm_path(jvm_path, sizeof(jvm_path));
3425 char *end = strrchr(jvm_path, *os::file_separator());
3426 if (end != NULL) *end = '\0';
3427 size_t jvm_path_len = strlen(jvm_path);
3428 size_t file_sep_len = strlen(os::file_separator());
3429 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3430 file_sep_len + 20, mtInternal);
3431 if (shared_archive_path != NULL) {
3432 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3433 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3434 strncat(shared_archive_path, "classes.jsa", 11);
3435 }
3436 } else {
3437 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3438 if (shared_archive_path != NULL) {
3439 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3440 }
3441 }
3442 return shared_archive_path;
3443 }
3444
3445 #ifndef PRODUCT
3446 // Determine whether LogVMOutput should be implicitly turned on.
3447 static bool use_vm_log() {
3448 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3449 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3450 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3451 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3452 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3453 return true;
3454 }
3455
3456 #ifdef COMPILER1
3457 if (PrintC1Statistics) {
3458 return true;
3459 }
3460 #endif // COMPILER1
3461
3462 #ifdef COMPILER2
3463 if (PrintOptoAssembly || PrintOptoStatistics) {
3464 return true;
3465 }
3466 #endif // COMPILER2
3467
3468 return false;
3469 }
3470 #endif // PRODUCT
3471
3472 // Parse entry point called from JNI_CreateJavaVM
3473
3474 jint Arguments::parse(const JavaVMInitArgs* args) {
3475
3476 // Remaining part of option string
3477 const char* tail;
3478
3479 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3480 const char* hotspotrc = ".hotspotrc";
3481 bool settings_file_specified = false;
3482 bool needs_hotspotrc_warning = false;
3483
3484 const char* flags_file;
3485 int index;
3486 for (index = 0; index < args->nOptions; index++) {
3487 const JavaVMOption *option = args->options + index;
3488 if (match_option(option, "-XX:Flags=", &tail)) {
3489 flags_file = tail;
3490 settings_file_specified = true;
3491 }
3492 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3493 PrintVMOptions = true;
3494 }
3495 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3496 PrintVMOptions = false;
3497 }
3498 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3499 IgnoreUnrecognizedVMOptions = true;
3500 }
3501 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3502 IgnoreUnrecognizedVMOptions = false;
3503 }
3504 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3505 CommandLineFlags::printFlags(tty, false);
3506 vm_exit(0);
3507 }
3508 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3509 #if INCLUDE_NMT
3510 MemTracker::init_tracking_options(tail);
3511 #else
3512 jio_fprintf(defaultStream::error_stream(),
3513 "Native Memory Tracking is not supported in this VM\n");
3514 return JNI_ERR;
3515 #endif
3516 }
3517
3518
3519 #ifndef PRODUCT
3520 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3521 CommandLineFlags::printFlags(tty, true);
3522 vm_exit(0);
3523 }
3524 #endif
3525 }
3526
3527 if (IgnoreUnrecognizedVMOptions) {
3528 // uncast const to modify the flag args->ignoreUnrecognized
3529 *(jboolean*)(&args->ignoreUnrecognized) = true;
3530 }
3531
3532 // Parse specified settings file
3533 if (settings_file_specified) {
3534 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3535 return JNI_EINVAL;
3536 }
3537 } else {
3538 #ifdef ASSERT
3539 // Parse default .hotspotrc settings file
3540 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3541 return JNI_EINVAL;
3542 }
3543 #else
3544 struct stat buf;
3545 if (os::stat(hotspotrc, &buf) == 0) {
3546 needs_hotspotrc_warning = true;
3547 }
3548 #endif
3549 }
3550
3551 if (PrintVMOptions) {
3552 for (index = 0; index < args->nOptions; index++) {
3553 const JavaVMOption *option = args->options + index;
3554 if (match_option(option, "-XX:", &tail)) {
3555 logOption(tail);
3556 }
3557 }
3558 }
3559
3560 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3561 jint result = parse_vm_init_args(args);
3562 if (result != JNI_OK) {
3563 return result;
3564 }
3565
3566 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3567 SharedArchivePath = get_shared_archive_path();
3568 if (SharedArchivePath == NULL) {
3569 return JNI_ENOMEM;
3570 }
3571
3572 // Delay warning until here so that we've had a chance to process
3573 // the -XX:-PrintWarnings flag
3574 if (needs_hotspotrc_warning) {
3575 warning("%s file is present but has been ignored. "
3576 "Run with -XX:Flags=%s to load the file.",
3577 hotspotrc, hotspotrc);
3578 }
3579
3580 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3581 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3582 #endif
3583
3584 #if INCLUDE_ALL_GCS
3585 #if (defined JAVASE_EMBEDDED || defined ARM)
3586 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3587 #endif
3588 #endif
3589
3590 #ifndef PRODUCT
3591 if (TraceBytecodesAt != 0) {
3592 TraceBytecodes = true;
3593 }
3594 if (CountCompiledCalls) {
3595 if (UseCounterDecay) {
3596 warning("UseCounterDecay disabled because CountCalls is set");
3597 UseCounterDecay = false;
3598 }
3599 }
3600 #endif // PRODUCT
3601
3602 // JSR 292 is not supported before 1.7
3603 if (!JDK_Version::is_gte_jdk17x_version()) {
3604 if (EnableInvokeDynamic) {
3605 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3606 warning("JSR 292 is not supported before 1.7. Disabling support.");
3607 }
3608 EnableInvokeDynamic = false;
3609 }
3610 }
3611
3612 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3613 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3614 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3615 }
3616 ScavengeRootsInCode = 1;
3617 }
3618
3619 if (PrintGCDetails) {
3620 // Turn on -verbose:gc options as well
3621 PrintGC = true;
3622 }
3623
3624 if (!JDK_Version::is_gte_jdk18x_version()) {
3625 // To avoid changing the log format for 7 updates this flag is only
3626 // true by default in JDK8 and above.
3627 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3628 FLAG_SET_DEFAULT(PrintGCCause, false);
3629 }
3630 }
3631
3632 // Set object alignment values.
3633 set_object_alignment();
3634
3635 #if !INCLUDE_ALL_GCS
3636 force_serial_gc();
3637 #endif // INCLUDE_ALL_GCS
3638 #if !INCLUDE_CDS
3639 if (DumpSharedSpaces || RequireSharedSpaces) {
3640 jio_fprintf(defaultStream::error_stream(),
3641 "Shared spaces are not supported in this VM\n");
3642 return JNI_ERR;
3643 }
3644 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3645 warning("Shared spaces are not supported in this VM");
3646 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3647 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3648 }
3649 no_shared_spaces();
3650 #endif // INCLUDE_CDS
3651
3652 return JNI_OK;
3653 }
3654
3655 jint Arguments::apply_ergo() {
3656
3657 // Set flags based on ergonomics.
3658 set_ergonomics_flags();
3659
3660 set_shared_spaces_flags();
3661
3662 // Check the GC selections again.
3663 if (!check_gc_consistency()) {
3664 return JNI_EINVAL;
3665 }
3666
3667 if (TieredCompilation) {
3668 set_tiered_flags();
3669 } else {
3670 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3671 if (CompilationPolicyChoice >= 2) {
3672 vm_exit_during_initialization(
3673 "Incompatible compilation policy selected", NULL);
3674 }
3675 }
3676 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3677 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3678 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3679 }
3680
3681
3682 // Set heap size based on available physical memory
3683 set_heap_size();
3684
3685 #if INCLUDE_ALL_GCS
3686 // Set per-collector flags
3687 if (UseParallelGC || UseParallelOldGC) {
3688 set_parallel_gc_flags();
3689 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
3690 set_cms_and_parnew_gc_flags();
3691 } else if (UseParNewGC) { // Skipped if CMS is set above
3692 set_parnew_gc_flags();
3693 } else if (UseG1GC) {
3694 set_g1_gc_flags();
3695 }
3696 check_deprecated_gcs();
3697 check_deprecated_gc_flags();
3698 if (AssumeMP && !UseSerialGC) {
3699 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3700 warning("If the number of processors is expected to increase from one, then"
3701 " you should configure the number of parallel GC threads appropriately"
3702 " using -XX:ParallelGCThreads=N");
3703 }
3704 }
3705 if (MinHeapFreeRatio == 100) {
3706 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
3707 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
3708 }
3709 #else // INCLUDE_ALL_GCS
3710 assert(verify_serial_gc_flags(), "SerialGC unset");
3711 #endif // INCLUDE_ALL_GCS
3712
3713 // Initialize Metaspace flags and alignments.
3714 Metaspace::ergo_initialize();
3715
3716 // Set bytecode rewriting flags
3717 set_bytecode_flags();
3718
3719 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3720 set_aggressive_opts_flags();
3721
3722 // Turn off biased locking for locking debug mode flags,
3723 // which are subtlely different from each other but neither works with
3724 // biased locking.
3725 if (UseHeavyMonitors
3726 #ifdef COMPILER1
3727 || !UseFastLocking
3728 #endif // COMPILER1
3729 ) {
3730 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3731 // flag set to true on command line; warn the user that they
3732 // can't enable biased locking here
3733 warning("Biased Locking is not supported with locking debug flags"
3734 "; ignoring UseBiasedLocking flag." );
3735 }
3736 UseBiasedLocking = false;
3737 }
3738
3739 #ifdef CC_INTERP
3740 // Clear flags not supported by the C++ interpreter
3741 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3742 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3743 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3744 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3745 #endif // CC_INTERP
3746
3747 #ifdef COMPILER2
3748 if (!UseBiasedLocking || EmitSync != 0) {
3749 UseOptoBiasInlining = false;
3750 }
3751 if (!EliminateLocks) {
3752 EliminateNestedLocks = false;
3753 }
3754 if (!Inline) {
3755 IncrementalInline = false;
3756 }
3757 #ifndef PRODUCT
3758 if (!IncrementalInline) {
3759 AlwaysIncrementalInline = false;
3760 }
3761 #endif
3762 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3763 // incremental inlining: bump MaxNodeLimit
3764 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3765 }
3766 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3767 // nothing to use the profiling, turn if off
3768 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3769 }
3770 if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) {
3771 // Doing the replace in parent maps helps speculation
3772 FLAG_SET_DEFAULT(ReplaceInParentMaps, true);
3773 }
3774 #endif
3775
3776 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3777 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3778 DebugNonSafepoints = true;
3779 }
3780
3781 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3782 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3783 }
3784
3785 #ifndef PRODUCT
3786 if (CompileTheWorld) {
3787 // Force NmethodSweeper to sweep whole CodeCache each time.
3788 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3789 NmethodSweepFraction = 1;
3790 }
3791 }
3792
3793 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3794 if (use_vm_log()) {
3795 LogVMOutput = true;
3796 }
3797 }
3798 #endif // PRODUCT
3799
3800 if (PrintCommandLineFlags) {
3801 CommandLineFlags::printSetFlags(tty);
3802 }
3803
3804 // Apply CPU specific policy for the BiasedLocking
3805 if (UseBiasedLocking) {
3806 if (!VM_Version::use_biased_locking() &&
3807 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3808 UseBiasedLocking = false;
3809 }
3810 }
3811
3812 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3813 // but only if not already set on the commandline
3814 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3815 bool set = false;
3816 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3817 if (!set) {
3818 FLAG_SET_DEFAULT(PauseAtExit, true);
3819 }
3820 }
3821
3822 return JNI_OK;
3823 }
3824
3825 jint Arguments::adjust_after_os() {
3826 #if INCLUDE_ALL_GCS
3827 if (UseParallelGC || UseParallelOldGC) {
3828 if (UseNUMA) {
3829 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3830 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3831 }
3832 // For those collectors or operating systems (eg, Windows) that do
3833 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3834 UseNUMAInterleaving = true;
3835 }
3836 }
3837 #endif // INCLUDE_ALL_GCS
3838 return JNI_OK;
3839 }
3840
3841 int Arguments::PropertyList_count(SystemProperty* pl) {
3842 int count = 0;
3843 while(pl != NULL) {
3844 count++;
3845 pl = pl->next();
3846 }
3847 return count;
3848 }
3849
3850 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3851 assert(key != NULL, "just checking");
3852 SystemProperty* prop;
3853 for (prop = pl; prop != NULL; prop = prop->next()) {
3854 if (strcmp(key, prop->key()) == 0) return prop->value();
3855 }
3856 return NULL;
3857 }
3858
3859 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3860 int count = 0;
3861 const char* ret_val = NULL;
3862
3863 while(pl != NULL) {
3864 if(count >= index) {
3865 ret_val = pl->key();
3866 break;
3867 }
3868 count++;
3869 pl = pl->next();
3870 }
3871
3872 return ret_val;
3873 }
3874
3875 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3876 int count = 0;
3877 char* ret_val = NULL;
3878
3879 while(pl != NULL) {
3880 if(count >= index) {
3881 ret_val = pl->value();
3882 break;
3883 }
3884 count++;
3885 pl = pl->next();
3886 }
3887
3888 return ret_val;
3889 }
3890
3891 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3892 SystemProperty* p = *plist;
3893 if (p == NULL) {
3894 *plist = new_p;
3895 } else {
3896 while (p->next() != NULL) {
3897 p = p->next();
3898 }
3899 p->set_next(new_p);
3900 }
3901 }
3902
3903 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3904 if (plist == NULL)
3905 return;
3906
3907 SystemProperty* new_p = new SystemProperty(k, v, true);
3908 PropertyList_add(plist, new_p);
3909 }
3910
3911 // This add maintains unique property key in the list.
3912 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3913 if (plist == NULL)
3914 return;
3915
3916 // If property key exist then update with new value.
3917 SystemProperty* prop;
3918 for (prop = *plist; prop != NULL; prop = prop->next()) {
3919 if (strcmp(k, prop->key()) == 0) {
3920 if (append) {
3921 prop->append_value(v);
3922 } else {
3923 prop->set_value(v);
3924 }
3925 return;
3926 }
3927 }
3928
3929 PropertyList_add(plist, k, v);
3930 }
3931
3932 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3933 // Returns true if all of the source pointed by src has been copied over to
3934 // the destination buffer pointed by buf. Otherwise, returns false.
3935 // Notes:
3936 // 1. If the length (buflen) of the destination buffer excluding the
3937 // NULL terminator character is not long enough for holding the expanded
3938 // pid characters, it also returns false instead of returning the partially
3939 // expanded one.
3940 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3941 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3942 char* buf, size_t buflen) {
3943 const char* p = src;
3944 char* b = buf;
3945 const char* src_end = &src[srclen];
3946 char* buf_end = &buf[buflen - 1];
3947
3948 while (p < src_end && b < buf_end) {
3949 if (*p == '%') {
3950 switch (*(++p)) {
3951 case '%': // "%%" ==> "%"
3952 *b++ = *p++;
3953 break;
3954 case 'p': { // "%p" ==> current process id
3955 // buf_end points to the character before the last character so
3956 // that we could write '\0' to the end of the buffer.
3957 size_t buf_sz = buf_end - b + 1;
3958 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3959
3960 // if jio_snprintf fails or the buffer is not long enough to hold
3961 // the expanded pid, returns false.
3962 if (ret < 0 || ret >= (int)buf_sz) {
3963 return false;
3964 } else {
3965 b += ret;
3966 assert(*b == '\0', "fail in copy_expand_pid");
3967 if (p == src_end && b == buf_end + 1) {
3968 // reach the end of the buffer.
3969 return true;
3970 }
3971 }
3972 p++;
3973 break;
3974 }
3975 default :
3976 *b++ = '%';
3977 }
3978 } else {
3979 *b++ = *p++;
3980 }
3981 }
3982 *b = '\0';
3983 return (p == src_end); // return false if not all of the source was copied
3984 }