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 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
1136 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
1137 }
1138 }
1139
1140 #if INCLUDE_ALL_GCS
1141 static void disable_adaptive_size_policy(const char* collector_name) {
1142 if (UseAdaptiveSizePolicy) {
1143 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1144 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1145 collector_name);
1146 }
1147 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1148 }
1149 }
1150
1151 void Arguments::set_parnew_gc_flags() {
1152 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1153 "control point invariant");
1154 assert(UseParNewGC, "Error");
1155
1156 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1157 disable_adaptive_size_policy("UseParNewGC");
1158
1159 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1160 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1161 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1162 } else if (ParallelGCThreads == 0) {
1163 jio_fprintf(defaultStream::error_stream(),
1164 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1165 vm_exit(1);
1166 }
1167
1168 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1169 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1170 // we set them to 1024 and 1024.
1171 // See CR 6362902.
1172 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1173 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1174 }
1175 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1176 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1177 }
1178
1179 // AlwaysTenure flag should make ParNew promote all at first collection.
1180 // See CR 6362902.
1181 if (AlwaysTenure) {
1182 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1183 }
1184 // When using compressed oops, we use local overflow stacks,
1185 // rather than using a global overflow list chained through
1186 // the klass word of the object's pre-image.
1187 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1188 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1189 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1190 }
1191 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1192 }
1193 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1194 }
1195
1196 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1197 // sparc/solaris for certain applications, but would gain from
1198 // further optimization and tuning efforts, and would almost
1199 // certainly gain from analysis of platform and environment.
1200 void Arguments::set_cms_and_parnew_gc_flags() {
1201 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1202 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1203
1204 // If we are using CMS, we prefer to UseParNewGC,
1205 // unless explicitly forbidden.
1206 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1207 FLAG_SET_ERGO(bool, UseParNewGC, true);
1208 }
1209
1210 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1211 disable_adaptive_size_policy("UseConcMarkSweepGC");
1212
1213 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1214 // as needed.
1215 if (UseParNewGC) {
1216 set_parnew_gc_flags();
1217 }
1218
1219 size_t max_heap = align_size_down(MaxHeapSize,
1220 CardTableRS::ct_max_alignment_constraint());
1221
1222 // Now make adjustments for CMS
1223 intx tenuring_default = (intx)6;
1224 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1225
1226 // Preferred young gen size for "short" pauses:
1227 // upper bound depends on # of threads and NewRatio.
1228 const uintx parallel_gc_threads =
1229 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1230 const size_t preferred_max_new_size_unaligned =
1231 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1232 size_t preferred_max_new_size =
1233 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1234
1235 // Unless explicitly requested otherwise, size young gen
1236 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1237
1238 // If either MaxNewSize or NewRatio is set on the command line,
1239 // assume the user is trying to set the size of the young gen.
1240 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1241
1242 // Set MaxNewSize to our calculated preferred_max_new_size unless
1243 // NewSize was set on the command line and it is larger than
1244 // preferred_max_new_size.
1245 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1246 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1247 } else {
1248 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1249 }
1250 if (PrintGCDetails && Verbose) {
1251 // Too early to use gclog_or_tty
1252 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1253 }
1254
1255 // Code along this path potentially sets NewSize and OldSize
1256 if (PrintGCDetails && Verbose) {
1257 // Too early to use gclog_or_tty
1258 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1259 " initial_heap_size: " SIZE_FORMAT
1260 " max_heap: " SIZE_FORMAT,
1261 min_heap_size(), InitialHeapSize, max_heap);
1262 }
1263 size_t min_new = preferred_max_new_size;
1264 if (FLAG_IS_CMDLINE(NewSize)) {
1265 min_new = NewSize;
1266 }
1267 if (max_heap > min_new && min_heap_size() > min_new) {
1268 // Unless explicitly requested otherwise, make young gen
1269 // at least min_new, and at most preferred_max_new_size.
1270 if (FLAG_IS_DEFAULT(NewSize)) {
1271 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1272 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1273 if (PrintGCDetails && Verbose) {
1274 // Too early to use gclog_or_tty
1275 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1276 }
1277 }
1278 // Unless explicitly requested otherwise, size old gen
1279 // so it's NewRatio x of NewSize.
1280 if (FLAG_IS_DEFAULT(OldSize)) {
1281 if (max_heap > NewSize) {
1282 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1283 if (PrintGCDetails && Verbose) {
1284 // Too early to use gclog_or_tty
1285 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1286 }
1287 }
1288 }
1289 }
1290 }
1291 // Unless explicitly requested otherwise, definitely
1292 // promote all objects surviving "tenuring_default" scavenges.
1293 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1294 FLAG_IS_DEFAULT(SurvivorRatio)) {
1295 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1296 }
1297 // If we decided above (or user explicitly requested)
1298 // `promote all' (via MaxTenuringThreshold := 0),
1299 // prefer minuscule survivor spaces so as not to waste
1300 // space for (non-existent) survivors
1301 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1302 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1303 }
1304 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1305 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1306 // This is done in order to make ParNew+CMS configuration to work
1307 // with YoungPLABSize and OldPLABSize options.
1308 // See CR 6362902.
1309 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1310 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1311 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1312 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1313 // the value (either from the command line or ergonomics) of
1314 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1315 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1316 } else {
1317 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1318 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1319 // we'll let it to take precedence.
1320 jio_fprintf(defaultStream::error_stream(),
1321 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1322 " options are specified for the CMS collector."
1323 " CMSParPromoteBlocksToClaim will take precedence.\n");
1324 }
1325 }
1326 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1327 // OldPLAB sizing manually turned off: Use a larger default setting,
1328 // unless it was manually specified. This is because a too-low value
1329 // will slow down scavenges.
1330 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1331 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1332 }
1333 }
1334 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1335 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1336 // If either of the static initialization defaults have changed, note this
1337 // modification.
1338 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1339 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1340 }
1341 if (PrintGCDetails && Verbose) {
1342 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1343 MarkStackSize / K, MarkStackSizeMax / K);
1344 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1345 }
1346 }
1347 #endif // INCLUDE_ALL_GCS
1348
1349 void set_object_alignment() {
1350 // Object alignment.
1351 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1352 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1353 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1354 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1355 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1356 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1357
1358 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1359 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1360
1361 // Oop encoding heap max
1362 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1363
1364 #if INCLUDE_ALL_GCS
1365 // Set CMS global values
1366 CompactibleFreeListSpace::set_cms_values();
1367 #endif // INCLUDE_ALL_GCS
1368 }
1369
1370 bool verify_object_alignment() {
1371 // Object alignment.
1372 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1373 jio_fprintf(defaultStream::error_stream(),
1374 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1375 (int)ObjectAlignmentInBytes);
1376 return false;
1377 }
1378 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1379 jio_fprintf(defaultStream::error_stream(),
1380 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1381 (int)ObjectAlignmentInBytes, BytesPerLong);
1382 return false;
1383 }
1384 // It does not make sense to have big object alignment
1385 // since a space lost due to alignment will be greater
1386 // then a saved space from compressed oops.
1387 if ((int)ObjectAlignmentInBytes > 256) {
1388 jio_fprintf(defaultStream::error_stream(),
1389 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1390 (int)ObjectAlignmentInBytes);
1391 return false;
1392 }
1393 // In case page size is very small.
1394 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1395 jio_fprintf(defaultStream::error_stream(),
1396 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1397 (int)ObjectAlignmentInBytes, os::vm_page_size());
1398 return false;
1399 }
1400 return true;
1401 }
1402
1403 uintx Arguments::max_heap_for_compressed_oops() {
1404 // Avoid sign flip.
1405 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1406 // We need to fit both the NULL page and the heap into the memory budget, while
1407 // keeping alignment constraints of the heap. To guarantee the latter, as the
1408 // NULL page is located before the heap, we pad the NULL page to the conservative
1409 // maximum alignment that the GC may ever impose upon the heap.
1410 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1411 _conservative_max_heap_alignment);
1412
1413 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1414 NOT_LP64(ShouldNotReachHere(); return 0);
1415 }
1416
1417 bool Arguments::should_auto_select_low_pause_collector() {
1418 if (UseAutoGCSelectPolicy &&
1419 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1420 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1421 if (PrintGCDetails) {
1422 // Cannot use gclog_or_tty yet.
1423 tty->print_cr("Automatic selection of the low pause collector"
1424 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1425 }
1426 return true;
1427 }
1428 return false;
1429 }
1430
1431 void Arguments::set_use_compressed_oops() {
1432 #ifndef ZERO
1433 #ifdef _LP64
1434 // MaxHeapSize is not set up properly at this point, but
1435 // the only value that can override MaxHeapSize if we are
1436 // to use UseCompressedOops is InitialHeapSize.
1437 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1438
1439 if (max_heap_size <= max_heap_for_compressed_oops()) {
1440 #if !defined(COMPILER1) || defined(TIERED)
1441 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1442 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1443 }
1444 #endif
1445 #ifdef _WIN64
1446 if (UseLargePages && UseCompressedOops) {
1447 // Cannot allocate guard pages for implicit checks in indexed addressing
1448 // mode, when large pages are specified on windows.
1449 // This flag could be switched ON if narrow oop base address is set to 0,
1450 // see code in Universe::initialize_heap().
1451 Universe::set_narrow_oop_use_implicit_null_checks(false);
1452 }
1453 #endif // _WIN64
1454 } else {
1455 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1456 warning("Max heap size too large for Compressed Oops");
1457 FLAG_SET_DEFAULT(UseCompressedOops, false);
1458 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1459 }
1460 }
1461 #endif // _LP64
1462 #endif // ZERO
1463 }
1464
1465
1466 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1467 // set_use_compressed_oops().
1468 void Arguments::set_use_compressed_klass_ptrs() {
1469 #ifndef ZERO
1470 #ifdef _LP64
1471 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1472 if (!UseCompressedOops) {
1473 if (UseCompressedClassPointers) {
1474 warning("UseCompressedClassPointers requires UseCompressedOops");
1475 }
1476 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1477 } else {
1478 // Turn on UseCompressedClassPointers too
1479 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1480 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1481 }
1482 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1483 if (UseCompressedClassPointers) {
1484 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1485 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1486 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1487 }
1488 }
1489 }
1490 #endif // _LP64
1491 #endif // !ZERO
1492 }
1493
1494 void Arguments::set_conservative_max_heap_alignment() {
1495 // The conservative maximum required alignment for the heap is the maximum of
1496 // the alignments imposed by several sources: any requirements from the heap
1497 // itself, the collector policy and the maximum page size we may run the VM
1498 // with.
1499 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1500 #if INCLUDE_ALL_GCS
1501 if (UseParallelGC) {
1502 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1503 } else if (UseG1GC) {
1504 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1505 }
1506 #endif // INCLUDE_ALL_GCS
1507 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(),
1508 CollectorPolicy::compute_heap_alignment());
1509 }
1510
1511 void Arguments::set_ergonomics_flags() {
1512
1513 if (os::is_server_class_machine()) {
1514 // If no other collector is requested explicitly,
1515 // let the VM select the collector based on
1516 // machine class and automatic selection policy.
1517 if (!UseSerialGC &&
1518 !UseConcMarkSweepGC &&
1519 !UseG1GC &&
1520 !UseParNewGC &&
1521 FLAG_IS_DEFAULT(UseParallelGC)) {
1522 if (should_auto_select_low_pause_collector()) {
1523 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1524 } else {
1525 FLAG_SET_ERGO(bool, UseParallelGC, true);
1526 }
1527 }
1528 }
1529 #ifdef COMPILER2
1530 // Shared spaces work fine with other GCs but causes bytecode rewriting
1531 // to be disabled, which hurts interpreter performance and decreases
1532 // server performance. When -server is specified, keep the default off
1533 // unless it is asked for. Future work: either add bytecode rewriting
1534 // at link time, or rewrite bytecodes in non-shared methods.
1535 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1536 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1537 no_shared_spaces();
1538 }
1539 #endif
1540
1541 set_conservative_max_heap_alignment();
1542
1543 #ifndef ZERO
1544 #ifdef _LP64
1545 set_use_compressed_oops();
1546
1547 // set_use_compressed_klass_ptrs() must be called after calling
1548 // set_use_compressed_oops().
1549 set_use_compressed_klass_ptrs();
1550
1551 // Also checks that certain machines are slower with compressed oops
1552 // in vm_version initialization code.
1553 #endif // _LP64
1554 #endif // !ZERO
1555 }
1556
1557 void Arguments::set_parallel_gc_flags() {
1558 assert(UseParallelGC || UseParallelOldGC, "Error");
1559 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1560 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1561 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1562 }
1563 FLAG_SET_DEFAULT(UseParallelGC, true);
1564
1565 // If no heap maximum was requested explicitly, use some reasonable fraction
1566 // of the physical memory, up to a maximum of 1GB.
1567 FLAG_SET_DEFAULT(ParallelGCThreads,
1568 Abstract_VM_Version::parallel_worker_threads());
1569 if (ParallelGCThreads == 0) {
1570 jio_fprintf(defaultStream::error_stream(),
1571 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1572 vm_exit(1);
1573 }
1574
1575
1576 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1577 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1578 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1579 // See CR 6362902 for details.
1580 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1581 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1582 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1583 }
1584 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1585 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1586 }
1587 }
1588
1589 if (UseParallelOldGC) {
1590 // Par compact uses lower default values since they are treated as
1591 // minimums. These are different defaults because of the different
1592 // interpretation and are not ergonomically set.
1593 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1594 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1595 }
1596 }
1597 }
1598
1599 void Arguments::set_g1_gc_flags() {
1600 assert(UseG1GC, "Error");
1601 #ifdef COMPILER1
1602 FastTLABRefill = false;
1603 #endif
1604 FLAG_SET_DEFAULT(ParallelGCThreads,
1605 Abstract_VM_Version::parallel_worker_threads());
1606 if (ParallelGCThreads == 0) {
1607 FLAG_SET_DEFAULT(ParallelGCThreads,
1608 Abstract_VM_Version::parallel_worker_threads());
1609 }
1610
1611 // MarkStackSize will be set (if it hasn't been set by the user)
1612 // when concurrent marking is initialized.
1613 // Its value will be based upon the number of parallel marking threads.
1614 // But we do set the maximum mark stack size here.
1615 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1616 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1617 }
1618
1619 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1620 // In G1, we want the default GC overhead goal to be higher than
1621 // say in PS. So we set it here to 10%. Otherwise the heap might
1622 // be expanded more aggressively than we would like it to. In
1623 // fact, even 10% seems to not be high enough in some cases
1624 // (especially small GC stress tests that the main thing they do
1625 // is allocation). We might consider increase it further.
1626 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1627 }
1628
1629 if (PrintGCDetails && Verbose) {
1630 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1631 MarkStackSize / K, MarkStackSizeMax / K);
1632 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1633 }
1634 }
1635
1636 julong Arguments::limit_by_allocatable_memory(julong limit) {
1637 julong max_allocatable;
1638 julong result = limit;
1639 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1640 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1641 }
1642 return result;
1643 }
1644
1645 void Arguments::set_heap_size() {
1646 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1647 // Deprecated flag
1648 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1649 }
1650
1651 const julong phys_mem =
1652 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1653 : (julong)MaxRAM;
1654
1655 // If the maximum heap size has not been set with -Xmx,
1656 // then set it as fraction of the size of physical memory,
1657 // respecting the maximum and minimum sizes of the heap.
1658 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1659 julong reasonable_max = phys_mem / MaxRAMFraction;
1660
1661 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1662 // Small physical memory, so use a minimum fraction of it for the heap
1663 reasonable_max = phys_mem / MinRAMFraction;
1664 } else {
1665 // Not-small physical memory, so require a heap at least
1666 // as large as MaxHeapSize
1667 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1668 }
1669 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1670 // Limit the heap size to ErgoHeapSizeLimit
1671 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1672 }
1673 if (UseCompressedOops) {
1674 // Limit the heap size to the maximum possible when using compressed oops
1675 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1676 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1677 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1678 // but it should be not less than default MaxHeapSize.
1679 max_coop_heap -= HeapBaseMinAddress;
1680 }
1681 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1682 }
1683 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1684
1685 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1686 // An initial heap size was specified on the command line,
1687 // so be sure that the maximum size is consistent. Done
1688 // after call to limit_by_allocatable_memory because that
1689 // method might reduce the allocation size.
1690 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1691 }
1692
1693 if (PrintGCDetails && Verbose) {
1694 // Cannot use gclog_or_tty yet.
1695 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1696 }
1697 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1698 }
1699
1700 // If the minimum or initial heap_size have not been set or requested to be set
1701 // ergonomically, set them accordingly.
1702 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1703 julong reasonable_minimum = (julong)(OldSize + NewSize);
1704
1705 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1706
1707 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1708
1709 if (InitialHeapSize == 0) {
1710 julong reasonable_initial = phys_mem / InitialRAMFraction;
1711
1712 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1713 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1714
1715 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1716
1717 if (PrintGCDetails && Verbose) {
1718 // Cannot use gclog_or_tty yet.
1719 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1720 }
1721 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1722 }
1723 // If the minimum heap size has not been set (via -Xms),
1724 // synchronize with InitialHeapSize to avoid errors with the default value.
1725 if (min_heap_size() == 0) {
1726 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1727 if (PrintGCDetails && Verbose) {
1728 // Cannot use gclog_or_tty yet.
1729 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1730 }
1731 }
1732 }
1733 }
1734
1735 // This must be called after ergonomics because we want bytecode rewriting
1736 // if the server compiler is used, or if UseSharedSpaces is disabled.
1737 void Arguments::set_bytecode_flags() {
1738 // Better not attempt to store into a read-only space.
1739 if (UseSharedSpaces) {
1740 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1741 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1742 }
1743
1744 if (!RewriteBytecodes) {
1745 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1746 }
1747 }
1748
1749 // Aggressive optimization flags -XX:+AggressiveOpts
1750 void Arguments::set_aggressive_opts_flags() {
1751 #ifdef COMPILER2
1752 if (AggressiveUnboxing) {
1753 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1754 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1755 } else if (!EliminateAutoBox) {
1756 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1757 AggressiveUnboxing = false;
1758 }
1759 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1760 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1761 } else if (!DoEscapeAnalysis) {
1762 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1763 AggressiveUnboxing = false;
1764 }
1765 }
1766 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1767 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1768 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1769 }
1770 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1771 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1772 }
1773
1774 // Feed the cache size setting into the JDK
1775 char buffer[1024];
1776 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1777 add_property(buffer);
1778 }
1779 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1780 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1781 }
1782 #endif
1783
1784 if (AggressiveOpts) {
1785 // Sample flag setting code
1786 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1787 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1788 // }
1789 }
1790 }
1791
1792 //===========================================================================================================
1793 // Parsing of java.compiler property
1794
1795 void Arguments::process_java_compiler_argument(char* arg) {
1796 // For backwards compatibility, Djava.compiler=NONE or ""
1797 // causes us to switch to -Xint mode UNLESS -Xdebug
1798 // is also specified.
1799 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1800 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1801 }
1802 }
1803
1804 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1805 _sun_java_launcher = strdup(launcher);
1806 if (strcmp("gamma", _sun_java_launcher) == 0) {
1807 _created_by_gamma_launcher = true;
1808 }
1809 }
1810
1811 bool Arguments::created_by_java_launcher() {
1812 assert(_sun_java_launcher != NULL, "property must have value");
1813 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1814 }
1815
1816 bool Arguments::created_by_gamma_launcher() {
1817 return _created_by_gamma_launcher;
1818 }
1819
1820 //===========================================================================================================
1821 // Parsing of main arguments
1822
1823 bool Arguments::verify_interval(uintx val, uintx min,
1824 uintx max, const char* name) {
1825 // Returns true iff value is in the inclusive interval [min..max]
1826 // false, otherwise.
1827 if (val >= min && val <= max) {
1828 return true;
1829 }
1830 jio_fprintf(defaultStream::error_stream(),
1831 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1832 " and " UINTX_FORMAT "\n",
1833 name, val, min, max);
1834 return false;
1835 }
1836
1837 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1838 // Returns true if given value is at least specified min threshold
1839 // false, otherwise.
1840 if (val >= min ) {
1841 return true;
1842 }
1843 jio_fprintf(defaultStream::error_stream(),
1844 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1845 name, val, min);
1846 return false;
1847 }
1848
1849 bool Arguments::verify_percentage(uintx value, const char* name) {
1850 if (value <= 100) {
1851 return true;
1852 }
1853 jio_fprintf(defaultStream::error_stream(),
1854 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1855 name, value);
1856 return false;
1857 }
1858
1859 #if !INCLUDE_ALL_GCS
1860 #ifdef ASSERT
1861 static bool verify_serial_gc_flags() {
1862 return (UseSerialGC &&
1863 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1864 UseParallelGC || UseParallelOldGC));
1865 }
1866 #endif // ASSERT
1867 #endif // INCLUDE_ALL_GCS
1868
1869 // check if do gclog rotation
1870 // +UseGCLogFileRotation is a must,
1871 // no gc log rotation when log file not supplied or
1872 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1873 void check_gclog_consistency() {
1874 if (UseGCLogFileRotation) {
1875 if ((Arguments::gc_log_filename() == NULL) ||
1876 (NumberOfGCLogFiles == 0) ||
1877 (GCLogFileSize == 0)) {
1878 jio_fprintf(defaultStream::output_stream(),
1879 "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"
1880 "where num_of_file > 0 and num_of_size > 0\n"
1881 "GC log rotation is turned off\n");
1882 UseGCLogFileRotation = false;
1883 }
1884 }
1885
1886 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1887 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1888 jio_fprintf(defaultStream::output_stream(),
1889 "GCLogFileSize changed to minimum 8K\n");
1890 }
1891 }
1892
1893 // This function is called for -Xloggc:<filename>, it can be used
1894 // to check if a given file name(or string) conforms to the following
1895 // specification:
1896 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1897 // %p and %t only allowed once. We only limit usage of filename not path
1898 bool is_filename_valid(const char *file_name) {
1899 const char* p = file_name;
1900 char file_sep = os::file_separator()[0];
1901 const char* cp;
1902 // skip prefix path
1903 for (cp = file_name; *cp != '\0'; cp++) {
1904 if (*cp == '/' || *cp == file_sep) {
1905 p = cp + 1;
1906 }
1907 }
1908
1909 int count_p = 0;
1910 int count_t = 0;
1911 while (*p != '\0') {
1912 if ((*p >= '0' && *p <= '9') ||
1913 (*p >= 'A' && *p <= 'Z') ||
1914 (*p >= 'a' && *p <= 'z') ||
1915 *p == '-' ||
1916 *p == '_' ||
1917 *p == '.') {
1918 p++;
1919 continue;
1920 }
1921 if (*p == '%') {
1922 if(*(p + 1) == 'p') {
1923 p += 2;
1924 count_p ++;
1925 continue;
1926 }
1927 if (*(p + 1) == 't') {
1928 p += 2;
1929 count_t ++;
1930 continue;
1931 }
1932 }
1933 return false;
1934 }
1935 return count_p < 2 && count_t < 2;
1936 }
1937
1938 // Check consistency of GC selection
1939 bool Arguments::check_gc_consistency() {
1940 check_gclog_consistency();
1941 bool status = true;
1942 // Ensure that the user has not selected conflicting sets
1943 // of collectors. [Note: this check is merely a user convenience;
1944 // collectors over-ride each other so that only a non-conflicting
1945 // set is selected; however what the user gets is not what they
1946 // may have expected from the combination they asked for. It's
1947 // better to reduce user confusion by not allowing them to
1948 // select conflicting combinations.
1949 uint i = 0;
1950 if (UseSerialGC) i++;
1951 if (UseConcMarkSweepGC || UseParNewGC) i++;
1952 if (UseParallelGC || UseParallelOldGC) i++;
1953 if (UseG1GC) i++;
1954 if (i > 1) {
1955 jio_fprintf(defaultStream::error_stream(),
1956 "Conflicting collector combinations in option list; "
1957 "please refer to the release notes for the combinations "
1958 "allowed\n");
1959 status = false;
1960 }
1961 return status;
1962 }
1963
1964 void Arguments::check_deprecated_gcs() {
1965 if (UseConcMarkSweepGC && !UseParNewGC) {
1966 warning("Using the DefNew young collector with the CMS collector is deprecated "
1967 "and will likely be removed in a future release");
1968 }
1969
1970 if (UseParNewGC && !UseConcMarkSweepGC) {
1971 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1972 // set up UseSerialGC properly, so that can't be used in the check here.
1973 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1974 "and will likely be removed in a future release");
1975 }
1976
1977 if (CMSIncrementalMode) {
1978 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1979 }
1980 }
1981
1982 void Arguments::check_deprecated_gc_flags() {
1983 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
1984 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
1985 "and will likely be removed in future release");
1986 }
1987 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
1988 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
1989 "Use MaxRAMFraction instead.");
1990 }
1991 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
1992 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
1993 }
1994 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
1995 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
1996 }
1997 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
1998 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
1999 }
2000 }
2001
2002 // Check stack pages settings
2003 bool Arguments::check_stack_pages()
2004 {
2005 bool status = true;
2006 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2007 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2008 // greater stack shadow pages can't generate instruction to bang stack
2009 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2010 return status;
2011 }
2012
2013 // Check the consistency of vm_init_args
2014 bool Arguments::check_vm_args_consistency() {
2015 // Method for adding checks for flag consistency.
2016 // The intent is to warn the user of all possible conflicts,
2017 // before returning an error.
2018 // Note: Needs platform-dependent factoring.
2019 bool status = true;
2020
2021 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2022 // builds so the cost of stack banging can be measured.
2023 #if (defined(PRODUCT) && defined(SOLARIS))
2024 if (!UseBoundThreads && !UseStackBanging) {
2025 jio_fprintf(defaultStream::error_stream(),
2026 "-UseStackBanging conflicts with -UseBoundThreads\n");
2027
2028 status = false;
2029 }
2030 #endif
2031
2032 if (TLABRefillWasteFraction == 0) {
2033 jio_fprintf(defaultStream::error_stream(),
2034 "TLABRefillWasteFraction should be a denominator, "
2035 "not " SIZE_FORMAT "\n",
2036 TLABRefillWasteFraction);
2037 status = false;
2038 }
2039
2040 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2041 "AdaptiveSizePolicyWeight");
2042 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2043 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
2044 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
2045
2046 // Divide by bucket size to prevent a large size from causing rollover when
2047 // calculating amount of memory needed to be allocated for the String table.
2048 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2049 (max_uintx / StringTable::bucket_size()), "StringTable size");
2050
2051 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2052 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2053
2054 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
2055 jio_fprintf(defaultStream::error_stream(),
2056 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2057 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
2058 MinHeapFreeRatio, MaxHeapFreeRatio);
2059 status = false;
2060 }
2061 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
2062 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
2063
2064 // Min/MaxMetaspaceFreeRatio
2065 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2066 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2067
2068 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2069 jio_fprintf(defaultStream::error_stream(),
2070 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2071 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2072 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2073 MinMetaspaceFreeRatio,
2074 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2075 MaxMetaspaceFreeRatio);
2076 status = false;
2077 }
2078
2079 // Trying to keep 100% free is not practical
2080 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2081
2082 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2083 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2084 }
2085
2086 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2087 // Settings to encourage splitting.
2088 if (!FLAG_IS_CMDLINE(NewRatio)) {
2089 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2090 }
2091 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2092 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2093 }
2094 }
2095
2096 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2097 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2098 if (GCTimeLimit == 100) {
2099 // Turn off gc-overhead-limit-exceeded checks
2100 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2101 }
2102
2103 status = status && check_gc_consistency();
2104 status = status && check_stack_pages();
2105
2106 if (CMSIncrementalMode) {
2107 if (!UseConcMarkSweepGC) {
2108 jio_fprintf(defaultStream::error_stream(),
2109 "error: invalid argument combination.\n"
2110 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2111 "selected in order\nto use CMSIncrementalMode.\n");
2112 status = false;
2113 } else {
2114 status = status && verify_percentage(CMSIncrementalDutyCycle,
2115 "CMSIncrementalDutyCycle");
2116 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2117 "CMSIncrementalDutyCycleMin");
2118 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2119 "CMSIncrementalSafetyFactor");
2120 status = status && verify_percentage(CMSIncrementalOffset,
2121 "CMSIncrementalOffset");
2122 status = status && verify_percentage(CMSExpAvgFactor,
2123 "CMSExpAvgFactor");
2124 // If it was not set on the command line, set
2125 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2126 if (CMSInitiatingOccupancyFraction < 0) {
2127 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2128 }
2129 }
2130 }
2131
2132 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2133 // insists that we hold the requisite locks so that the iteration is
2134 // MT-safe. For the verification at start-up and shut-down, we don't
2135 // yet have a good way of acquiring and releasing these locks,
2136 // which are not visible at the CollectedHeap level. We want to
2137 // be able to acquire these locks and then do the iteration rather
2138 // than just disable the lock verification. This will be fixed under
2139 // bug 4788986.
2140 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2141 if (VerifyDuringStartup) {
2142 warning("Heap verification at start-up disabled "
2143 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2144 VerifyDuringStartup = false; // Disable verification at start-up
2145 }
2146
2147 if (VerifyBeforeExit) {
2148 warning("Heap verification at shutdown disabled "
2149 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2150 VerifyBeforeExit = false; // Disable verification at shutdown
2151 }
2152 }
2153
2154 // Note: only executed in non-PRODUCT mode
2155 if (!UseAsyncConcMarkSweepGC &&
2156 (ExplicitGCInvokesConcurrent ||
2157 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2158 jio_fprintf(defaultStream::error_stream(),
2159 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2160 " with -UseAsyncConcMarkSweepGC");
2161 status = false;
2162 }
2163
2164 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2165
2166 #if INCLUDE_ALL_GCS
2167 if (UseG1GC) {
2168 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2169 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2170 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2171
2172 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2173 "InitiatingHeapOccupancyPercent");
2174 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2175 "G1RefProcDrainInterval");
2176 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2177 "G1ConcMarkStepDurationMillis");
2178 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2179 "G1ConcRSHotCardLimit");
2180 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2181 "G1ConcRSLogCacheSize");
2182 }
2183 if (UseConcMarkSweepGC) {
2184 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2185 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2186 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2187 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2188
2189 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2190
2191 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2192 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2193 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2194
2195 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2196
2197 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2198 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2199
2200 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2201 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2202 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2203
2204 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2205
2206 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2207
2208 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2209 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2210 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2211 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2212 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2213 }
2214
2215 if (UseParallelGC || UseParallelOldGC) {
2216 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2217 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2218
2219 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2220 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2221
2222 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2223 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2224
2225 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2226
2227 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2228 }
2229 #endif // INCLUDE_ALL_GCS
2230
2231 status = status && verify_interval(RefDiscoveryPolicy,
2232 ReferenceProcessor::DiscoveryPolicyMin,
2233 ReferenceProcessor::DiscoveryPolicyMax,
2234 "RefDiscoveryPolicy");
2235
2236 // Limit the lower bound of this flag to 1 as it is used in a division
2237 // expression.
2238 status = status && verify_interval(TLABWasteTargetPercent,
2239 1, 100, "TLABWasteTargetPercent");
2240
2241 status = status && verify_object_alignment();
2242
2243 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2244 "CompressedClassSpaceSize");
2245
2246 status = status && verify_interval(MarkStackSizeMax,
2247 1, (max_jint - 1), "MarkStackSizeMax");
2248 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2249
2250 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2251
2252 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2253
2254 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2255
2256 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2257 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2258
2259 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2260
2261 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2262 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2263 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2264 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2265
2266 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2267 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2268
2269 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2270 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2271 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2272
2273 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2274 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2275
2276 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2277 // just for that, so hardcode here.
2278 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2279 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2280 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2281 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2282
2283 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2284 #ifdef SPARC
2285 if (UseConcMarkSweepGC || UseG1GC) {
2286 // Issue a stern warning if the user has explicitly set
2287 // UseMemSetInBOT (it is known to cause issues), but allow
2288 // use for experimentation and debugging.
2289 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2290 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2291 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2292 " on sun4v; please understand that you are using at your own risk!");
2293 }
2294 }
2295 #endif // SPARC
2296
2297 if (PrintNMTStatistics) {
2298 #if INCLUDE_NMT
2299 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2300 #endif // INCLUDE_NMT
2301 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2302 PrintNMTStatistics = false;
2303 #if INCLUDE_NMT
2304 }
2305 #endif
2306 }
2307
2308 // Need to limit the extent of the padding to reasonable size.
2309 // 8K is well beyond the reasonable HW cache line size, even with the
2310 // aggressive prefetching, while still leaving the room for segregating
2311 // among the distinct pages.
2312 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2313 jio_fprintf(defaultStream::error_stream(),
2314 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2315 ContendedPaddingWidth, 0, 8192);
2316 status = false;
2317 }
2318
2319 // Need to enforce the padding not to break the existing field alignments.
2320 // It is sufficient to check against the largest type size.
2321 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2322 jio_fprintf(defaultStream::error_stream(),
2323 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2324 ContendedPaddingWidth, BytesPerLong);
2325 status = false;
2326 }
2327
2328 // Check lower bounds of the code cache
2329 // Template Interpreter code is approximately 3X larger in debug builds.
2330 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2331 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2332 jio_fprintf(defaultStream::error_stream(),
2333 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2334 os::vm_page_size()/K);
2335 status = false;
2336 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2337 jio_fprintf(defaultStream::error_stream(),
2338 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2339 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2340 status = false;
2341 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2342 jio_fprintf(defaultStream::error_stream(),
2343 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2344 min_code_cache_size/K);
2345 status = false;
2346 } else if (ReservedCodeCacheSize > 2*G) {
2347 // Code cache size larger than MAXINT is not supported.
2348 jio_fprintf(defaultStream::error_stream(),
2349 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2350 (2*G)/M);
2351 status = false;
2352 }
2353
2354 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2355 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2356
2357 return status;
2358 }
2359
2360 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2361 const char* option_type) {
2362 if (ignore) return false;
2363
2364 const char* spacer = " ";
2365 if (option_type == NULL) {
2366 option_type = ++spacer; // Set both to the empty string.
2367 }
2368
2369 if (os::obsolete_option(option)) {
2370 jio_fprintf(defaultStream::error_stream(),
2371 "Obsolete %s%soption: %s\n", option_type, spacer,
2372 option->optionString);
2373 return false;
2374 } else {
2375 jio_fprintf(defaultStream::error_stream(),
2376 "Unrecognized %s%soption: %s\n", option_type, spacer,
2377 option->optionString);
2378 return true;
2379 }
2380 }
2381
2382 static const char* user_assertion_options[] = {
2383 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2384 };
2385
2386 static const char* system_assertion_options[] = {
2387 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2388 };
2389
2390 // Return true if any of the strings in null-terminated array 'names' matches.
2391 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2392 // the option must match exactly.
2393 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2394 bool tail_allowed) {
2395 for (/* empty */; *names != NULL; ++names) {
2396 if (match_option(option, *names, tail)) {
2397 if (**tail == '\0' || tail_allowed && **tail == ':') {
2398 return true;
2399 }
2400 }
2401 }
2402 return false;
2403 }
2404
2405 bool Arguments::parse_uintx(const char* value,
2406 uintx* uintx_arg,
2407 uintx min_size) {
2408
2409 // Check the sign first since atomull() parses only unsigned values.
2410 bool value_is_positive = !(*value == '-');
2411
2412 if (value_is_positive) {
2413 julong n;
2414 bool good_return = atomull(value, &n);
2415 if (good_return) {
2416 bool above_minimum = n >= min_size;
2417 bool value_is_too_large = n > max_uintx;
2418
2419 if (above_minimum && !value_is_too_large) {
2420 *uintx_arg = n;
2421 return true;
2422 }
2423 }
2424 }
2425 return false;
2426 }
2427
2428 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2429 julong* long_arg,
2430 julong min_size) {
2431 if (!atomull(s, long_arg)) return arg_unreadable;
2432 return check_memory_size(*long_arg, min_size);
2433 }
2434
2435 // Parse JavaVMInitArgs structure
2436
2437 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2438 // For components of the system classpath.
2439 SysClassPath scp(Arguments::get_sysclasspath());
2440 bool scp_assembly_required = false;
2441
2442 // Save default settings for some mode flags
2443 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2444 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2445 Arguments::_ClipInlining = ClipInlining;
2446 Arguments::_BackgroundCompilation = BackgroundCompilation;
2447
2448 // Setup flags for mixed which is the default
2449 set_mode_flags(_mixed);
2450
2451 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2452 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2453 if (result != JNI_OK) {
2454 return result;
2455 }
2456
2457 // Parse JavaVMInitArgs structure passed in
2458 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2459 if (result != JNI_OK) {
2460 return result;
2461 }
2462
2463 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2464 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2465 if (result != JNI_OK) {
2466 return result;
2467 }
2468
2469 // Do final processing now that all arguments have been parsed
2470 result = finalize_vm_init_args(&scp, scp_assembly_required);
2471 if (result != JNI_OK) {
2472 return result;
2473 }
2474
2475 return JNI_OK;
2476 }
2477
2478 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2479 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2480 // are dealing with -agentpath (case where name is a path), otherwise with
2481 // -agentlib
2482 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2483 char *_name;
2484 const char *_hprof = "hprof", *_jdwp = "jdwp";
2485 size_t _len_hprof, _len_jdwp, _len_prefix;
2486
2487 if (is_path) {
2488 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2489 return false;
2490 }
2491
2492 _name++; // skip past last path separator
2493 _len_prefix = strlen(JNI_LIB_PREFIX);
2494
2495 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2496 return false;
2497 }
2498
2499 _name += _len_prefix;
2500 _len_hprof = strlen(_hprof);
2501 _len_jdwp = strlen(_jdwp);
2502
2503 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2504 _name += _len_hprof;
2505 }
2506 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2507 _name += _len_jdwp;
2508 }
2509 else {
2510 return false;
2511 }
2512
2513 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2514 return false;
2515 }
2516
2517 return true;
2518 }
2519
2520 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2521 return true;
2522 }
2523
2524 return false;
2525 }
2526
2527 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2528 SysClassPath* scp_p,
2529 bool* scp_assembly_required_p,
2530 Flag::Flags origin) {
2531 // Remaining part of option string
2532 const char* tail;
2533
2534 // iterate over arguments
2535 for (int index = 0; index < args->nOptions; index++) {
2536 bool is_absolute_path = false; // for -agentpath vs -agentlib
2537
2538 const JavaVMOption* option = args->options + index;
2539
2540 if (!match_option(option, "-Djava.class.path", &tail) &&
2541 !match_option(option, "-Dsun.java.command", &tail) &&
2542 !match_option(option, "-Dsun.java.launcher", &tail)) {
2543
2544 // add all jvm options to the jvm_args string. This string
2545 // is used later to set the java.vm.args PerfData string constant.
2546 // the -Djava.class.path and the -Dsun.java.command options are
2547 // omitted from jvm_args string as each have their own PerfData
2548 // string constant object.
2549 build_jvm_args(option->optionString);
2550 }
2551
2552 // -verbose:[class/gc/jni]
2553 if (match_option(option, "-verbose", &tail)) {
2554 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2555 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2556 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2557 } else if (!strcmp(tail, ":gc")) {
2558 FLAG_SET_CMDLINE(bool, PrintGC, true);
2559 } else if (!strcmp(tail, ":jni")) {
2560 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2561 }
2562 // -da / -ea / -disableassertions / -enableassertions
2563 // These accept an optional class/package name separated by a colon, e.g.,
2564 // -da:java.lang.Thread.
2565 } else if (match_option(option, user_assertion_options, &tail, true)) {
2566 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2567 if (*tail == '\0') {
2568 JavaAssertions::setUserClassDefault(enable);
2569 } else {
2570 assert(*tail == ':', "bogus match by match_option()");
2571 JavaAssertions::addOption(tail + 1, enable);
2572 }
2573 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2574 } else if (match_option(option, system_assertion_options, &tail, false)) {
2575 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2576 JavaAssertions::setSystemClassDefault(enable);
2577 // -bootclasspath:
2578 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2579 scp_p->reset_path(tail);
2580 *scp_assembly_required_p = true;
2581 // -bootclasspath/a:
2582 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2583 scp_p->add_suffix(tail);
2584 *scp_assembly_required_p = true;
2585 // -bootclasspath/p:
2586 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2587 scp_p->add_prefix(tail);
2588 *scp_assembly_required_p = true;
2589 // -Xrun
2590 } else if (match_option(option, "-Xrun", &tail)) {
2591 if (tail != NULL) {
2592 const char* pos = strchr(tail, ':');
2593 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2594 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2595 name[len] = '\0';
2596
2597 char *options = NULL;
2598 if(pos != NULL) {
2599 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2600 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2601 }
2602 #if !INCLUDE_JVMTI
2603 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2604 jio_fprintf(defaultStream::error_stream(),
2605 "Profiling and debugging agents are not supported in this VM\n");
2606 return JNI_ERR;
2607 }
2608 #endif // !INCLUDE_JVMTI
2609 add_init_library(name, options);
2610 }
2611 // -agentlib and -agentpath
2612 } else if (match_option(option, "-agentlib:", &tail) ||
2613 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2614 if(tail != NULL) {
2615 const char* pos = strchr(tail, '=');
2616 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2617 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2618 name[len] = '\0';
2619
2620 char *options = NULL;
2621 if(pos != NULL) {
2622 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2623 }
2624 #if !INCLUDE_JVMTI
2625 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2626 jio_fprintf(defaultStream::error_stream(),
2627 "Profiling and debugging agents are not supported in this VM\n");
2628 return JNI_ERR;
2629 }
2630 #endif // !INCLUDE_JVMTI
2631 add_init_agent(name, options, is_absolute_path);
2632 }
2633 // -javaagent
2634 } else if (match_option(option, "-javaagent:", &tail)) {
2635 #if !INCLUDE_JVMTI
2636 jio_fprintf(defaultStream::error_stream(),
2637 "Instrumentation agents are not supported in this VM\n");
2638 return JNI_ERR;
2639 #else
2640 if(tail != NULL) {
2641 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2642 add_init_agent("instrument", options, false);
2643 }
2644 #endif // !INCLUDE_JVMTI
2645 // -Xnoclassgc
2646 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2647 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2648 // -Xincgc: i-CMS
2649 } else if (match_option(option, "-Xincgc", &tail)) {
2650 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2651 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2652 // -Xnoincgc: no i-CMS
2653 } else if (match_option(option, "-Xnoincgc", &tail)) {
2654 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2655 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2656 // -Xconcgc
2657 } else if (match_option(option, "-Xconcgc", &tail)) {
2658 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2659 // -Xnoconcgc
2660 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2661 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2662 // -Xbatch
2663 } else if (match_option(option, "-Xbatch", &tail)) {
2664 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2665 // -Xmn for compatibility with other JVM vendors
2666 } else if (match_option(option, "-Xmn", &tail)) {
2667 julong long_initial_young_size = 0;
2668 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2669 if (errcode != arg_in_range) {
2670 jio_fprintf(defaultStream::error_stream(),
2671 "Invalid initial young generation size: %s\n", option->optionString);
2672 describe_range_error(errcode);
2673 return JNI_EINVAL;
2674 }
2675 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2676 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2677 // -Xms
2678 } else if (match_option(option, "-Xms", &tail)) {
2679 julong long_initial_heap_size = 0;
2680 // an initial heap size of 0 means automatically determine
2681 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2682 if (errcode != arg_in_range) {
2683 jio_fprintf(defaultStream::error_stream(),
2684 "Invalid initial heap size: %s\n", option->optionString);
2685 describe_range_error(errcode);
2686 return JNI_EINVAL;
2687 }
2688 set_min_heap_size((uintx)long_initial_heap_size);
2689 // Currently the minimum size and the initial heap sizes are the same.
2690 // Can be overridden with -XX:InitialHeapSize.
2691 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2692 // -Xmx
2693 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2694 julong long_max_heap_size = 0;
2695 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2696 if (errcode != arg_in_range) {
2697 jio_fprintf(defaultStream::error_stream(),
2698 "Invalid maximum heap size: %s\n", option->optionString);
2699 describe_range_error(errcode);
2700 return JNI_EINVAL;
2701 }
2702 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2703 // Xmaxf
2704 } else if (match_option(option, "-Xmaxf", &tail)) {
2705 char* err;
2706 int maxf = (int)(strtod(tail, &err) * 100);
2707 if (*err != '\0' || maxf < 0 || maxf > 100) {
2708 jio_fprintf(defaultStream::error_stream(),
2709 "Bad max heap free percentage size: %s\n",
2710 option->optionString);
2711 return JNI_EINVAL;
2712 } else {
2713 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2714 }
2715 // Xminf
2716 } else if (match_option(option, "-Xminf", &tail)) {
2717 char* err;
2718 int minf = (int)(strtod(tail, &err) * 100);
2719 if (*err != '\0' || minf < 0 || minf > 100) {
2720 jio_fprintf(defaultStream::error_stream(),
2721 "Bad min heap free percentage size: %s\n",
2722 option->optionString);
2723 return JNI_EINVAL;
2724 } else {
2725 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2726 }
2727 // -Xss
2728 } else if (match_option(option, "-Xss", &tail)) {
2729 julong long_ThreadStackSize = 0;
2730 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2731 if (errcode != arg_in_range) {
2732 jio_fprintf(defaultStream::error_stream(),
2733 "Invalid thread stack size: %s\n", option->optionString);
2734 describe_range_error(errcode);
2735 return JNI_EINVAL;
2736 }
2737 // Internally track ThreadStackSize in units of 1024 bytes.
2738 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2739 round_to((int)long_ThreadStackSize, K) / K);
2740 // -Xoss
2741 } else if (match_option(option, "-Xoss", &tail)) {
2742 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2743 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2744 julong long_CodeCacheExpansionSize = 0;
2745 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2746 if (errcode != arg_in_range) {
2747 jio_fprintf(defaultStream::error_stream(),
2748 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2749 os::vm_page_size()/K);
2750 return JNI_EINVAL;
2751 }
2752 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2753 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2754 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2755 julong long_ReservedCodeCacheSize = 0;
2756
2757 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2758 if (errcode != arg_in_range) {
2759 jio_fprintf(defaultStream::error_stream(),
2760 "Invalid maximum code cache size: %s.\n", option->optionString);
2761 return JNI_EINVAL;
2762 }
2763 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2764 //-XX:IncreaseFirstTierCompileThresholdAt=
2765 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2766 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2767 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2768 jio_fprintf(defaultStream::error_stream(),
2769 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2770 option->optionString);
2771 return JNI_EINVAL;
2772 }
2773 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2774 // -green
2775 } else if (match_option(option, "-green", &tail)) {
2776 jio_fprintf(defaultStream::error_stream(),
2777 "Green threads support not available\n");
2778 return JNI_EINVAL;
2779 // -native
2780 } else if (match_option(option, "-native", &tail)) {
2781 // HotSpot always uses native threads, ignore silently for compatibility
2782 // -Xsqnopause
2783 } else if (match_option(option, "-Xsqnopause", &tail)) {
2784 // EVM option, ignore silently for compatibility
2785 // -Xrs
2786 } else if (match_option(option, "-Xrs", &tail)) {
2787 // Classic/EVM option, new functionality
2788 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2789 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2790 // change default internal VM signals used - lower case for back compat
2791 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2792 // -Xoptimize
2793 } else if (match_option(option, "-Xoptimize", &tail)) {
2794 // EVM option, ignore silently for compatibility
2795 // -Xprof
2796 } else if (match_option(option, "-Xprof", &tail)) {
2797 #if INCLUDE_FPROF
2798 _has_profile = true;
2799 #else // INCLUDE_FPROF
2800 jio_fprintf(defaultStream::error_stream(),
2801 "Flat profiling is not supported in this VM.\n");
2802 return JNI_ERR;
2803 #endif // INCLUDE_FPROF
2804 // -Xconcurrentio
2805 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2806 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2807 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2808 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2809 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2810 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2811
2812 // -Xinternalversion
2813 } else if (match_option(option, "-Xinternalversion", &tail)) {
2814 jio_fprintf(defaultStream::output_stream(), "%s\n",
2815 VM_Version::internal_vm_info_string());
2816 vm_exit(0);
2817 #ifndef PRODUCT
2818 // -Xprintflags
2819 } else if (match_option(option, "-Xprintflags", &tail)) {
2820 CommandLineFlags::printFlags(tty, false);
2821 vm_exit(0);
2822 #endif
2823 // -D
2824 } else if (match_option(option, "-D", &tail)) {
2825 if (!add_property(tail)) {
2826 return JNI_ENOMEM;
2827 }
2828 // Out of the box management support
2829 if (match_option(option, "-Dcom.sun.management", &tail)) {
2830 #if INCLUDE_MANAGEMENT
2831 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2832 #else
2833 jio_fprintf(defaultStream::output_stream(),
2834 "-Dcom.sun.management is not supported in this VM.\n");
2835 return JNI_ERR;
2836 #endif
2837 }
2838 // -Xint
2839 } else if (match_option(option, "-Xint", &tail)) {
2840 set_mode_flags(_int);
2841 // -Xmixed
2842 } else if (match_option(option, "-Xmixed", &tail)) {
2843 set_mode_flags(_mixed);
2844 // -Xcomp
2845 } else if (match_option(option, "-Xcomp", &tail)) {
2846 // for testing the compiler; turn off all flags that inhibit compilation
2847 set_mode_flags(_comp);
2848 // -Xshare:dump
2849 } else if (match_option(option, "-Xshare:dump", &tail)) {
2850 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2851 set_mode_flags(_int); // Prevent compilation, which creates objects
2852 // -Xshare:on
2853 } else if (match_option(option, "-Xshare:on", &tail)) {
2854 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2855 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2856 // -Xshare:auto
2857 } else if (match_option(option, "-Xshare:auto", &tail)) {
2858 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2859 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2860 // -Xshare:off
2861 } else if (match_option(option, "-Xshare:off", &tail)) {
2862 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2863 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2864 // -Xverify
2865 } else if (match_option(option, "-Xverify", &tail)) {
2866 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2867 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2868 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2869 } else if (strcmp(tail, ":remote") == 0) {
2870 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2871 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2872 } else if (strcmp(tail, ":none") == 0) {
2873 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2874 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2875 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2876 return JNI_EINVAL;
2877 }
2878 // -Xdebug
2879 } else if (match_option(option, "-Xdebug", &tail)) {
2880 // note this flag has been used, then ignore
2881 set_xdebug_mode(true);
2882 // -Xnoagent
2883 } else if (match_option(option, "-Xnoagent", &tail)) {
2884 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2885 } else if (match_option(option, "-Xboundthreads", &tail)) {
2886 // Bind user level threads to kernel threads (Solaris only)
2887 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2888 } else if (match_option(option, "-Xloggc:", &tail)) {
2889 // Redirect GC output to the file. -Xloggc:<filename>
2890 // ostream_init_log(), when called will use this filename
2891 // to initialize a fileStream.
2892 _gc_log_filename = strdup(tail);
2893 if (!is_filename_valid(_gc_log_filename)) {
2894 jio_fprintf(defaultStream::output_stream(),
2895 "Invalid file name for use with -Xloggc: Filename can only contain the "
2896 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2897 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2898 return JNI_EINVAL;
2899 }
2900 FLAG_SET_CMDLINE(bool, PrintGC, true);
2901 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2902
2903 // JNI hooks
2904 } else if (match_option(option, "-Xcheck", &tail)) {
2905 if (!strcmp(tail, ":jni")) {
2906 #if !INCLUDE_JNI_CHECK
2907 warning("JNI CHECKING is not supported in this VM");
2908 #else
2909 CheckJNICalls = true;
2910 #endif // INCLUDE_JNI_CHECK
2911 } else if (is_bad_option(option, args->ignoreUnrecognized,
2912 "check")) {
2913 return JNI_EINVAL;
2914 }
2915 } else if (match_option(option, "vfprintf", &tail)) {
2916 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2917 } else if (match_option(option, "exit", &tail)) {
2918 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2919 } else if (match_option(option, "abort", &tail)) {
2920 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2921 // -XX:+AggressiveHeap
2922 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2923
2924 // This option inspects the machine and attempts to set various
2925 // parameters to be optimal for long-running, memory allocation
2926 // intensive jobs. It is intended for machines with large
2927 // amounts of cpu and memory.
2928
2929 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2930 // VM, but we may not be able to represent the total physical memory
2931 // available (like having 8gb of memory on a box but using a 32bit VM).
2932 // Thus, we need to make sure we're using a julong for intermediate
2933 // calculations.
2934 julong initHeapSize;
2935 julong total_memory = os::physical_memory();
2936
2937 if (total_memory < (julong)256*M) {
2938 jio_fprintf(defaultStream::error_stream(),
2939 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2940 vm_exit(1);
2941 }
2942
2943 // The heap size is half of available memory, or (at most)
2944 // all of possible memory less 160mb (leaving room for the OS
2945 // when using ISM). This is the maximum; because adaptive sizing
2946 // is turned on below, the actual space used may be smaller.
2947
2948 initHeapSize = MIN2(total_memory / (julong)2,
2949 total_memory - (julong)160*M);
2950
2951 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2952
2953 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2954 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2955 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2956 // Currently the minimum size and the initial heap sizes are the same.
2957 set_min_heap_size(initHeapSize);
2958 }
2959 if (FLAG_IS_DEFAULT(NewSize)) {
2960 // Make the young generation 3/8ths of the total heap.
2961 FLAG_SET_CMDLINE(uintx, NewSize,
2962 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2963 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2964 }
2965
2966 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2967 FLAG_SET_DEFAULT(UseLargePages, true);
2968 #endif
2969
2970 // Increase some data structure sizes for efficiency
2971 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2972 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2973 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2974
2975 // See the OldPLABSize comment below, but replace 'after promotion'
2976 // with 'after copying'. YoungPLABSize is the size of the survivor
2977 // space per-gc-thread buffers. The default is 4kw.
2978 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2979
2980 // OldPLABSize is the size of the buffers in the old gen that
2981 // UseParallelGC uses to promote live data that doesn't fit in the
2982 // survivor spaces. At any given time, there's one for each gc thread.
2983 // The default size is 1kw. These buffers are rarely used, since the
2984 // survivor spaces are usually big enough. For specjbb, however, there
2985 // are occasions when there's lots of live data in the young gen
2986 // and we end up promoting some of it. We don't have a definite
2987 // explanation for why bumping OldPLABSize helps, but the theory
2988 // is that a bigger PLAB results in retaining something like the
2989 // original allocation order after promotion, which improves mutator
2990 // locality. A minor effect may be that larger PLABs reduce the
2991 // number of PLAB allocation events during gc. The value of 8kw
2992 // was arrived at by experimenting with specjbb.
2993 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2994
2995 // Enable parallel GC and adaptive generation sizing
2996 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2997 FLAG_SET_DEFAULT(ParallelGCThreads,
2998 Abstract_VM_Version::parallel_worker_threads());
2999
3000 // Encourage steady state memory management
3001 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3002
3003 // This appears to improve mutator locality
3004 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3005
3006 // Get around early Solaris scheduling bug
3007 // (affinity vs other jobs on system)
3008 // but disallow DR and offlining (5008695).
3009 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3010
3011 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3012 // The last option must always win.
3013 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3014 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3015 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3016 // The last option must always win.
3017 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3018 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3019 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3020 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3021 jio_fprintf(defaultStream::error_stream(),
3022 "Please use CMSClassUnloadingEnabled in place of "
3023 "CMSPermGenSweepingEnabled in the future\n");
3024 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3025 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3026 jio_fprintf(defaultStream::error_stream(),
3027 "Please use -XX:+UseGCOverheadLimit in place of "
3028 "-XX:+UseGCTimeLimit in the future\n");
3029 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3030 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3031 jio_fprintf(defaultStream::error_stream(),
3032 "Please use -XX:-UseGCOverheadLimit in place of "
3033 "-XX:-UseGCTimeLimit in the future\n");
3034 // The TLE options are for compatibility with 1.3 and will be
3035 // removed without notice in a future release. These options
3036 // are not to be documented.
3037 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3038 // No longer used.
3039 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3040 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3041 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3042 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3043 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3044 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3045 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3046 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3047 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3048 // No longer used.
3049 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3050 julong long_tlab_size = 0;
3051 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3052 if (errcode != arg_in_range) {
3053 jio_fprintf(defaultStream::error_stream(),
3054 "Invalid TLAB size: %s\n", option->optionString);
3055 describe_range_error(errcode);
3056 return JNI_EINVAL;
3057 }
3058 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3059 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3060 // No longer used.
3061 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3062 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3063 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3064 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3065 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3066 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3067 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3068 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3069 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3070 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3071 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3072 #if defined(DTRACE_ENABLED)
3073 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3074 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3075 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3076 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3077 #else // defined(DTRACE_ENABLED)
3078 jio_fprintf(defaultStream::error_stream(),
3079 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3080 return JNI_EINVAL;
3081 #endif // defined(DTRACE_ENABLED)
3082 #ifdef ASSERT
3083 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3084 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3085 // disable scavenge before parallel mark-compact
3086 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3087 #endif
3088 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3089 julong cms_blocks_to_claim = (julong)atol(tail);
3090 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3091 jio_fprintf(defaultStream::error_stream(),
3092 "Please use -XX:OldPLABSize in place of "
3093 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3094 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3095 julong cms_blocks_to_claim = (julong)atol(tail);
3096 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3097 jio_fprintf(defaultStream::error_stream(),
3098 "Please use -XX:OldPLABSize in place of "
3099 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3100 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3101 julong old_plab_size = 0;
3102 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3103 if (errcode != arg_in_range) {
3104 jio_fprintf(defaultStream::error_stream(),
3105 "Invalid old PLAB size: %s\n", option->optionString);
3106 describe_range_error(errcode);
3107 return JNI_EINVAL;
3108 }
3109 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3110 jio_fprintf(defaultStream::error_stream(),
3111 "Please use -XX:OldPLABSize in place of "
3112 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3113 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3114 julong young_plab_size = 0;
3115 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3116 if (errcode != arg_in_range) {
3117 jio_fprintf(defaultStream::error_stream(),
3118 "Invalid young PLAB size: %s\n", option->optionString);
3119 describe_range_error(errcode);
3120 return JNI_EINVAL;
3121 }
3122 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3123 jio_fprintf(defaultStream::error_stream(),
3124 "Please use -XX:YoungPLABSize in place of "
3125 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3126 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3127 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3128 julong stack_size = 0;
3129 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3130 if (errcode != arg_in_range) {
3131 jio_fprintf(defaultStream::error_stream(),
3132 "Invalid mark stack size: %s\n", option->optionString);
3133 describe_range_error(errcode);
3134 return JNI_EINVAL;
3135 }
3136 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3137 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3138 julong max_stack_size = 0;
3139 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3140 if (errcode != arg_in_range) {
3141 jio_fprintf(defaultStream::error_stream(),
3142 "Invalid maximum mark stack size: %s\n",
3143 option->optionString);
3144 describe_range_error(errcode);
3145 return JNI_EINVAL;
3146 }
3147 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3148 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3149 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3150 uintx conc_threads = 0;
3151 if (!parse_uintx(tail, &conc_threads, 1)) {
3152 jio_fprintf(defaultStream::error_stream(),
3153 "Invalid concurrent threads: %s\n", option->optionString);
3154 return JNI_EINVAL;
3155 }
3156 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3157 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3158 julong max_direct_memory_size = 0;
3159 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3160 if (errcode != arg_in_range) {
3161 jio_fprintf(defaultStream::error_stream(),
3162 "Invalid maximum direct memory size: %s\n",
3163 option->optionString);
3164 describe_range_error(errcode);
3165 return JNI_EINVAL;
3166 }
3167 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3168 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3169 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3170 // away and will cause VM initialization failures!
3171 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3172 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3173 #if !INCLUDE_MANAGEMENT
3174 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3175 jio_fprintf(defaultStream::error_stream(),
3176 "ManagementServer is not supported in this VM.\n");
3177 return JNI_ERR;
3178 #endif // INCLUDE_MANAGEMENT
3179 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3180 // Skip -XX:Flags= since that case has already been handled
3181 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3182 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3183 return JNI_EINVAL;
3184 }
3185 }
3186 // Unknown option
3187 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3188 return JNI_ERR;
3189 }
3190 }
3191
3192 // Change the default value for flags which have different default values
3193 // when working with older JDKs.
3194 #ifdef LINUX
3195 if (JDK_Version::current().compare_major(6) <= 0 &&
3196 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3197 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3198 }
3199 #endif // LINUX
3200 return JNI_OK;
3201 }
3202
3203 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3204 // This must be done after all -D arguments have been processed.
3205 scp_p->expand_endorsed();
3206
3207 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3208 // Assemble the bootclasspath elements into the final path.
3209 Arguments::set_sysclasspath(scp_p->combined_path());
3210 }
3211
3212 // This must be done after all arguments have been processed.
3213 // java_compiler() true means set to "NONE" or empty.
3214 if (java_compiler() && !xdebug_mode()) {
3215 // For backwards compatibility, we switch to interpreted mode if
3216 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3217 // not specified.
3218 set_mode_flags(_int);
3219 }
3220 if (CompileThreshold == 0) {
3221 set_mode_flags(_int);
3222 }
3223
3224 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3225 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3226 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3227 }
3228
3229 #ifndef COMPILER2
3230 // Don't degrade server performance for footprint
3231 if (FLAG_IS_DEFAULT(UseLargePages) &&
3232 MaxHeapSize < LargePageHeapSizeThreshold) {
3233 // No need for large granularity pages w/small heaps.
3234 // Note that large pages are enabled/disabled for both the
3235 // Java heap and the code cache.
3236 FLAG_SET_DEFAULT(UseLargePages, false);
3237 }
3238
3239 #else
3240 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3241 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3242 }
3243 #endif
3244
3245 #ifndef TIERED
3246 // Tiered compilation is undefined.
3247 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3248 #endif
3249
3250 // If we are running in a headless jre, force java.awt.headless property
3251 // to be true unless the property has already been set.
3252 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3253 if (os::is_headless_jre()) {
3254 const char* headless = Arguments::get_property("java.awt.headless");
3255 if (headless == NULL) {
3256 char envbuffer[128];
3257 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3258 if (!add_property("java.awt.headless=true")) {
3259 return JNI_ENOMEM;
3260 }
3261 } else {
3262 char buffer[256];
3263 strcpy(buffer, "java.awt.headless=");
3264 strcat(buffer, envbuffer);
3265 if (!add_property(buffer)) {
3266 return JNI_ENOMEM;
3267 }
3268 }
3269 }
3270 }
3271
3272 if (!check_vm_args_consistency()) {
3273 return JNI_ERR;
3274 }
3275
3276 return JNI_OK;
3277 }
3278
3279 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3280 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3281 scp_assembly_required_p);
3282 }
3283
3284 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3285 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3286 scp_assembly_required_p);
3287 }
3288
3289 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3290 const int N_MAX_OPTIONS = 64;
3291 const int OPTION_BUFFER_SIZE = 1024;
3292 char buffer[OPTION_BUFFER_SIZE];
3293
3294 // The variable will be ignored if it exceeds the length of the buffer.
3295 // Don't check this variable if user has special privileges
3296 // (e.g. unix su command).
3297 if (os::getenv(name, buffer, sizeof(buffer)) &&
3298 !os::have_special_privileges()) {
3299 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3300 jio_fprintf(defaultStream::error_stream(),
3301 "Picked up %s: %s\n", name, buffer);
3302 char* rd = buffer; // pointer to the input string (rd)
3303 int i;
3304 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3305 while (isspace(*rd)) rd++; // skip whitespace
3306 if (*rd == 0) break; // we re done when the input string is read completely
3307
3308 // The output, option string, overwrites the input string.
3309 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3310 // input string (rd).
3311 char* wrt = rd;
3312
3313 options[i++].optionString = wrt; // Fill in option
3314 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3315 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3316 int quote = *rd; // matching quote to look for
3317 rd++; // don't copy open quote
3318 while (*rd != quote) { // include everything (even spaces) up until quote
3319 if (*rd == 0) { // string termination means unmatched string
3320 jio_fprintf(defaultStream::error_stream(),
3321 "Unmatched quote in %s\n", name);
3322 return JNI_ERR;
3323 }
3324 *wrt++ = *rd++; // copy to option string
3325 }
3326 rd++; // don't copy close quote
3327 } else {
3328 *wrt++ = *rd++; // copy to option string
3329 }
3330 }
3331 // Need to check if we're done before writing a NULL,
3332 // because the write could be to the byte that rd is pointing to.
3333 if (*rd++ == 0) {
3334 *wrt = 0;
3335 break;
3336 }
3337 *wrt = 0; // Zero terminate option
3338 }
3339 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3340 JavaVMInitArgs vm_args;
3341 vm_args.version = JNI_VERSION_1_2;
3342 vm_args.options = options;
3343 vm_args.nOptions = i;
3344 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3345
3346 if (PrintVMOptions) {
3347 const char* tail;
3348 for (int i = 0; i < vm_args.nOptions; i++) {
3349 const JavaVMOption *option = vm_args.options + i;
3350 if (match_option(option, "-XX:", &tail)) {
3351 logOption(tail);
3352 }
3353 }
3354 }
3355
3356 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3357 }
3358 return JNI_OK;
3359 }
3360
3361 void Arguments::set_shared_spaces_flags() {
3362 if (DumpSharedSpaces) {
3363 if (RequireSharedSpaces) {
3364 warning("cannot dump shared archive while using shared archive");
3365 }
3366 UseSharedSpaces = false;
3367 #ifdef _LP64
3368 if (!UseCompressedOops || !UseCompressedClassPointers) {
3369 vm_exit_during_initialization(
3370 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3371 }
3372 } else {
3373 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3374 if (!UseCompressedOops || !UseCompressedClassPointers) {
3375 no_shared_spaces();
3376 }
3377 #endif
3378 }
3379 }
3380
3381 #if !INCLUDE_ALL_GCS
3382 static void force_serial_gc() {
3383 FLAG_SET_DEFAULT(UseSerialGC, true);
3384 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3385 UNSUPPORTED_GC_OPTION(UseG1GC);
3386 UNSUPPORTED_GC_OPTION(UseParallelGC);
3387 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3388 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3389 UNSUPPORTED_GC_OPTION(UseParNewGC);
3390 }
3391 #endif // INCLUDE_ALL_GCS
3392
3393 // Sharing support
3394 // Construct the path to the archive
3395 static char* get_shared_archive_path() {
3396 char *shared_archive_path;
3397 if (SharedArchiveFile == NULL) {
3398 char jvm_path[JVM_MAXPATHLEN];
3399 os::jvm_path(jvm_path, sizeof(jvm_path));
3400 char *end = strrchr(jvm_path, *os::file_separator());
3401 if (end != NULL) *end = '\0';
3402 size_t jvm_path_len = strlen(jvm_path);
3403 size_t file_sep_len = strlen(os::file_separator());
3404 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3405 file_sep_len + 20, mtInternal);
3406 if (shared_archive_path != NULL) {
3407 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3408 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3409 strncat(shared_archive_path, "classes.jsa", 11);
3410 }
3411 } else {
3412 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3413 if (shared_archive_path != NULL) {
3414 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3415 }
3416 }
3417 return shared_archive_path;
3418 }
3419
3420 #ifndef PRODUCT
3421 // Determine whether LogVMOutput should be implicitly turned on.
3422 static bool use_vm_log() {
3423 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3424 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3425 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3426 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3427 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3428 return true;
3429 }
3430
3431 #ifdef COMPILER1
3432 if (PrintC1Statistics) {
3433 return true;
3434 }
3435 #endif // COMPILER1
3436
3437 #ifdef COMPILER2
3438 if (PrintOptoAssembly || PrintOptoStatistics) {
3439 return true;
3440 }
3441 #endif // COMPILER2
3442
3443 return false;
3444 }
3445 #endif // PRODUCT
3446
3447 // Parse entry point called from JNI_CreateJavaVM
3448
3449 jint Arguments::parse(const JavaVMInitArgs* args) {
3450
3451 // Remaining part of option string
3452 const char* tail;
3453
3454 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3455 const char* hotspotrc = ".hotspotrc";
3456 bool settings_file_specified = false;
3457 bool needs_hotspotrc_warning = false;
3458
3459 const char* flags_file;
3460 int index;
3461 for (index = 0; index < args->nOptions; index++) {
3462 const JavaVMOption *option = args->options + index;
3463 if (match_option(option, "-XX:Flags=", &tail)) {
3464 flags_file = tail;
3465 settings_file_specified = true;
3466 }
3467 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3468 PrintVMOptions = true;
3469 }
3470 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3471 PrintVMOptions = false;
3472 }
3473 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3474 IgnoreUnrecognizedVMOptions = true;
3475 }
3476 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3477 IgnoreUnrecognizedVMOptions = false;
3478 }
3479 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3480 CommandLineFlags::printFlags(tty, false);
3481 vm_exit(0);
3482 }
3483 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3484 #if INCLUDE_NMT
3485 MemTracker::init_tracking_options(tail);
3486 #else
3487 jio_fprintf(defaultStream::error_stream(),
3488 "Native Memory Tracking is not supported in this VM\n");
3489 return JNI_ERR;
3490 #endif
3491 }
3492
3493
3494 #ifndef PRODUCT
3495 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3496 CommandLineFlags::printFlags(tty, true);
3497 vm_exit(0);
3498 }
3499 #endif
3500 }
3501
3502 if (IgnoreUnrecognizedVMOptions) {
3503 // uncast const to modify the flag args->ignoreUnrecognized
3504 *(jboolean*)(&args->ignoreUnrecognized) = true;
3505 }
3506
3507 // Parse specified settings file
3508 if (settings_file_specified) {
3509 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3510 return JNI_EINVAL;
3511 }
3512 } else {
3513 #ifdef ASSERT
3514 // Parse default .hotspotrc settings file
3515 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3516 return JNI_EINVAL;
3517 }
3518 #else
3519 struct stat buf;
3520 if (os::stat(hotspotrc, &buf) == 0) {
3521 needs_hotspotrc_warning = true;
3522 }
3523 #endif
3524 }
3525
3526 if (PrintVMOptions) {
3527 for (index = 0; index < args->nOptions; index++) {
3528 const JavaVMOption *option = args->options + index;
3529 if (match_option(option, "-XX:", &tail)) {
3530 logOption(tail);
3531 }
3532 }
3533 }
3534
3535 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3536 jint result = parse_vm_init_args(args);
3537 if (result != JNI_OK) {
3538 return result;
3539 }
3540
3541 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3542 SharedArchivePath = get_shared_archive_path();
3543 if (SharedArchivePath == NULL) {
3544 return JNI_ENOMEM;
3545 }
3546
3547 // Delay warning until here so that we've had a chance to process
3548 // the -XX:-PrintWarnings flag
3549 if (needs_hotspotrc_warning) {
3550 warning("%s file is present but has been ignored. "
3551 "Run with -XX:Flags=%s to load the file.",
3552 hotspotrc, hotspotrc);
3553 }
3554
3555 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3556 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3557 #endif
3558
3559 #if INCLUDE_ALL_GCS
3560 #if (defined JAVASE_EMBEDDED || defined ARM)
3561 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3562 #endif
3563 #endif
3564
3565 #ifndef PRODUCT
3566 if (TraceBytecodesAt != 0) {
3567 TraceBytecodes = true;
3568 }
3569 if (CountCompiledCalls) {
3570 if (UseCounterDecay) {
3571 warning("UseCounterDecay disabled because CountCalls is set");
3572 UseCounterDecay = false;
3573 }
3574 }
3575 #endif // PRODUCT
3576
3577 // JSR 292 is not supported before 1.7
3578 if (!JDK_Version::is_gte_jdk17x_version()) {
3579 if (EnableInvokeDynamic) {
3580 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3581 warning("JSR 292 is not supported before 1.7. Disabling support.");
3582 }
3583 EnableInvokeDynamic = false;
3584 }
3585 }
3586
3587 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3588 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3589 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3590 }
3591 ScavengeRootsInCode = 1;
3592 }
3593
3594 if (PrintGCDetails) {
3595 // Turn on -verbose:gc options as well
3596 PrintGC = true;
3597 }
3598
3599 if (!JDK_Version::is_gte_jdk18x_version()) {
3600 // To avoid changing the log format for 7 updates this flag is only
3601 // true by default in JDK8 and above.
3602 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3603 FLAG_SET_DEFAULT(PrintGCCause, false);
3604 }
3605 }
3606
3607 // Set object alignment values.
3608 set_object_alignment();
3609
3610 #if !INCLUDE_ALL_GCS
3611 force_serial_gc();
3612 #endif // INCLUDE_ALL_GCS
3613 #if !INCLUDE_CDS
3614 if (DumpSharedSpaces || RequireSharedSpaces) {
3615 jio_fprintf(defaultStream::error_stream(),
3616 "Shared spaces are not supported in this VM\n");
3617 return JNI_ERR;
3618 }
3619 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3620 warning("Shared spaces are not supported in this VM");
3621 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3622 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3623 }
3624 no_shared_spaces();
3625 #endif // INCLUDE_CDS
3626
3627 return JNI_OK;
3628 }
3629
3630 jint Arguments::apply_ergo() {
3631
3632 // Set flags based on ergonomics.
3633 set_ergonomics_flags();
3634
3635 set_shared_spaces_flags();
3636
3637 // Check the GC selections again.
3638 if (!check_gc_consistency()) {
3639 return JNI_EINVAL;
3640 }
3641
3642 if (TieredCompilation) {
3643 set_tiered_flags();
3644 } else {
3645 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3646 if (CompilationPolicyChoice >= 2) {
3647 vm_exit_during_initialization(
3648 "Incompatible compilation policy selected", NULL);
3649 }
3650 }
3651
3652 // Set heap size based on available physical memory
3653 set_heap_size();
3654
3655 #if INCLUDE_ALL_GCS
3656 // Set per-collector flags
3657 if (UseParallelGC || UseParallelOldGC) {
3658 set_parallel_gc_flags();
3659 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3660 set_cms_and_parnew_gc_flags();
3661 } else if (UseParNewGC) { // skipped if CMS is set above
3662 set_parnew_gc_flags();
3663 } else if (UseG1GC) {
3664 set_g1_gc_flags();
3665 }
3666 check_deprecated_gcs();
3667 check_deprecated_gc_flags();
3668 if (AssumeMP && !UseSerialGC) {
3669 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3670 warning("If the number of processors is expected to increase from one, then"
3671 " you should configure the number of parallel GC threads appropriately"
3672 " using -XX:ParallelGCThreads=N");
3673 }
3674 }
3675 #else // INCLUDE_ALL_GCS
3676 assert(verify_serial_gc_flags(), "SerialGC unset");
3677 #endif // INCLUDE_ALL_GCS
3678
3679 // Initialize Metaspace flags and alignments.
3680 Metaspace::ergo_initialize();
3681
3682 // Set bytecode rewriting flags
3683 set_bytecode_flags();
3684
3685 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3686 set_aggressive_opts_flags();
3687
3688 // Turn off biased locking for locking debug mode flags,
3689 // which are subtlely different from each other but neither works with
3690 // biased locking.
3691 if (UseHeavyMonitors
3692 #ifdef COMPILER1
3693 || !UseFastLocking
3694 #endif // COMPILER1
3695 ) {
3696 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3697 // flag set to true on command line; warn the user that they
3698 // can't enable biased locking here
3699 warning("Biased Locking is not supported with locking debug flags"
3700 "; ignoring UseBiasedLocking flag." );
3701 }
3702 UseBiasedLocking = false;
3703 }
3704
3705 #ifdef CC_INTERP
3706 // Clear flags not supported by the C++ interpreter
3707 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3708 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3709 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3710 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3711 #endif // CC_INTERP
3712
3713 #ifdef COMPILER2
3714 if (!UseBiasedLocking || EmitSync != 0) {
3715 UseOptoBiasInlining = false;
3716 }
3717 if (!EliminateLocks) {
3718 EliminateNestedLocks = false;
3719 }
3720 if (!Inline) {
3721 IncrementalInline = false;
3722 }
3723 #ifndef PRODUCT
3724 if (!IncrementalInline) {
3725 AlwaysIncrementalInline = false;
3726 }
3727 #endif
3728 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3729 // incremental inlining: bump MaxNodeLimit
3730 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3731 }
3732 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3733 // nothing to use the profiling, turn if off
3734 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3735 }
3736 if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) {
3737 // Doing the replace in parent maps helps speculation
3738 FLAG_SET_DEFAULT(ReplaceInParentMaps, true);
3739 }
3740 #ifndef X86
3741 // Only on x86 for now
3742 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3743 #endif
3744 #endif
3745
3746 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3747 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3748 DebugNonSafepoints = true;
3749 }
3750
3751 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3752 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3753 }
3754
3755 #ifndef PRODUCT
3756 if (CompileTheWorld) {
3757 // Force NmethodSweeper to sweep whole CodeCache each time.
3758 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3759 NmethodSweepFraction = 1;
3760 }
3761 }
3762
3763 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3764 if (use_vm_log()) {
3765 LogVMOutput = true;
3766 }
3767 }
3768 #endif // PRODUCT
3769
3770 if (PrintCommandLineFlags) {
3771 CommandLineFlags::printSetFlags(tty);
3772 }
3773
3774 // Apply CPU specific policy for the BiasedLocking
3775 if (UseBiasedLocking) {
3776 if (!VM_Version::use_biased_locking() &&
3777 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3778 UseBiasedLocking = false;
3779 }
3780 }
3781
3782 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3783 // but only if not already set on the commandline
3784 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3785 bool set = false;
3786 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3787 if (!set) {
3788 FLAG_SET_DEFAULT(PauseAtExit, true);
3789 }
3790 }
3791
3792 return JNI_OK;
3793 }
3794
3795 jint Arguments::adjust_after_os() {
3796 #if INCLUDE_ALL_GCS
3797 if (UseParallelGC || UseParallelOldGC) {
3798 if (UseNUMA) {
3799 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3800 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3801 }
3802 // For those collectors or operating systems (eg, Windows) that do
3803 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3804 UseNUMAInterleaving = true;
3805 }
3806 }
3807 #endif // INCLUDE_ALL_GCS
3808 return JNI_OK;
3809 }
3810
3811 int Arguments::PropertyList_count(SystemProperty* pl) {
3812 int count = 0;
3813 while(pl != NULL) {
3814 count++;
3815 pl = pl->next();
3816 }
3817 return count;
3818 }
3819
3820 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3821 assert(key != NULL, "just checking");
3822 SystemProperty* prop;
3823 for (prop = pl; prop != NULL; prop = prop->next()) {
3824 if (strcmp(key, prop->key()) == 0) return prop->value();
3825 }
3826 return NULL;
3827 }
3828
3829 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3830 int count = 0;
3831 const char* ret_val = NULL;
3832
3833 while(pl != NULL) {
3834 if(count >= index) {
3835 ret_val = pl->key();
3836 break;
3837 }
3838 count++;
3839 pl = pl->next();
3840 }
3841
3842 return ret_val;
3843 }
3844
3845 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3846 int count = 0;
3847 char* ret_val = NULL;
3848
3849 while(pl != NULL) {
3850 if(count >= index) {
3851 ret_val = pl->value();
3852 break;
3853 }
3854 count++;
3855 pl = pl->next();
3856 }
3857
3858 return ret_val;
3859 }
3860
3861 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3862 SystemProperty* p = *plist;
3863 if (p == NULL) {
3864 *plist = new_p;
3865 } else {
3866 while (p->next() != NULL) {
3867 p = p->next();
3868 }
3869 p->set_next(new_p);
3870 }
3871 }
3872
3873 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3874 if (plist == NULL)
3875 return;
3876
3877 SystemProperty* new_p = new SystemProperty(k, v, true);
3878 PropertyList_add(plist, new_p);
3879 }
3880
3881 // This add maintains unique property key in the list.
3882 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3883 if (plist == NULL)
3884 return;
3885
3886 // If property key exist then update with new value.
3887 SystemProperty* prop;
3888 for (prop = *plist; prop != NULL; prop = prop->next()) {
3889 if (strcmp(k, prop->key()) == 0) {
3890 if (append) {
3891 prop->append_value(v);
3892 } else {
3893 prop->set_value(v);
3894 }
3895 return;
3896 }
3897 }
3898
3899 PropertyList_add(plist, k, v);
3900 }
3901
3902 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3903 // Returns true if all of the source pointed by src has been copied over to
3904 // the destination buffer pointed by buf. Otherwise, returns false.
3905 // Notes:
3906 // 1. If the length (buflen) of the destination buffer excluding the
3907 // NULL terminator character is not long enough for holding the expanded
3908 // pid characters, it also returns false instead of returning the partially
3909 // expanded one.
3910 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3911 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3912 char* buf, size_t buflen) {
3913 const char* p = src;
3914 char* b = buf;
3915 const char* src_end = &src[srclen];
3916 char* buf_end = &buf[buflen - 1];
3917
3918 while (p < src_end && b < buf_end) {
3919 if (*p == '%') {
3920 switch (*(++p)) {
3921 case '%': // "%%" ==> "%"
3922 *b++ = *p++;
3923 break;
3924 case 'p': { // "%p" ==> current process id
3925 // buf_end points to the character before the last character so
3926 // that we could write '\0' to the end of the buffer.
3927 size_t buf_sz = buf_end - b + 1;
3928 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3929
3930 // if jio_snprintf fails or the buffer is not long enough to hold
3931 // the expanded pid, returns false.
3932 if (ret < 0 || ret >= (int)buf_sz) {
3933 return false;
3934 } else {
3935 b += ret;
3936 assert(*b == '\0', "fail in copy_expand_pid");
3937 if (p == src_end && b == buf_end + 1) {
3938 // reach the end of the buffer.
3939 return true;
3940 }
3941 }
3942 p++;
3943 break;
3944 }
3945 default :
3946 *b++ = '%';
3947 }
3948 } else {
3949 *b++ = *p++;
3950 }
3951 }
3952 *b = '\0';
3953 return (p == src_end); // return false if not all of the source was copied
3954 }