1 /*
2 * Copyright (c) 1997, 2018, 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/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "compiler/compilerOracle.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/cardTableRS.hpp"
32 #include "memory/genCollectedHeap.hpp"
33 #include "memory/referenceProcessor.hpp"
34 #include "memory/universe.inline.hpp"
35 #include "oops/oop.inline.hpp"
36 #include "prims/jvmtiExport.hpp"
37 #include "runtime/arguments.hpp"
38 #include "runtime/arguments_ext.hpp"
39 #include "runtime/globals_extension.hpp"
40 #include "runtime/java.hpp"
41 #include "services/management.hpp"
42 #include "services/memTracker.hpp"
43 #include "utilities/defaultStream.hpp"
44 #include "utilities/macros.hpp"
45 #include "utilities/stringUtils.hpp"
46 #include "utilities/taskqueue.hpp"
47 #if INCLUDE_JFR
48 #include "jfr/jfr.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_linux
51 # include "os_linux.inline.hpp"
52 #endif
53 #ifdef TARGET_OS_FAMILY_solaris
54 # include "os_solaris.inline.hpp"
55 #endif
56 #ifdef TARGET_OS_FAMILY_windows
57 # include "os_windows.inline.hpp"
58 #endif
59 #ifdef TARGET_OS_FAMILY_aix
60 # include "os_aix.inline.hpp"
61 #endif
62 #ifdef TARGET_OS_FAMILY_bsd
63 # include "os_bsd.inline.hpp"
64 #endif
65 #if INCLUDE_ALL_GCS
66 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
67 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
68 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
69 #endif // INCLUDE_ALL_GCS
70
71 // Note: This is a special bug reporting site for the JVM
72 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
73 #define DEFAULT_JAVA_LAUNCHER "generic"
74
75 // Disable options not supported in this release, with a warning if they
76 // were explicitly requested on the command-line
77 #define UNSUPPORTED_OPTION(opt, description) \
78 do { \
79 if (opt) { \
80 if (FLAG_IS_CMDLINE(opt)) { \
81 warning(description " is disabled in this release."); \
82 } \
83 FLAG_SET_DEFAULT(opt, false); \
84 } \
85 } while(0)
86
87 #define UNSUPPORTED_GC_OPTION(gc) \
88 do { \
89 if (gc) { \
90 if (FLAG_IS_CMDLINE(gc)) { \
91 warning(#gc " is not supported in this VM. Using Serial GC."); \
92 } \
93 FLAG_SET_DEFAULT(gc, false); \
94 } \
95 } while(0)
96
97 char** Arguments::_jvm_flags_array = NULL;
98 int Arguments::_num_jvm_flags = 0;
99 char** Arguments::_jvm_args_array = NULL;
100 int Arguments::_num_jvm_args = 0;
101 char* Arguments::_java_command = NULL;
102 SystemProperty* Arguments::_system_properties = NULL;
103 const char* Arguments::_gc_log_filename = NULL;
104 bool Arguments::_has_profile = false;
105 size_t Arguments::_conservative_max_heap_alignment = 0;
106 uintx Arguments::_min_heap_size = 0;
107 uintx Arguments::_min_heap_free_ratio = 0;
108 uintx Arguments::_max_heap_free_ratio = 0;
109 Arguments::Mode Arguments::_mode = _mixed;
110 bool Arguments::_java_compiler = false;
111 bool Arguments::_xdebug_mode = false;
112 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
113 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
114 int Arguments::_sun_java_launcher_pid = -1;
115 bool Arguments::_created_by_gamma_launcher = false;
116
117 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
118 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
119 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
120 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
121 bool Arguments::_ClipInlining = ClipInlining;
122
123 char* Arguments::SharedArchivePath = NULL;
124
125 AgentLibraryList Arguments::_libraryList;
126 AgentLibraryList Arguments::_agentList;
127
128 abort_hook_t Arguments::_abort_hook = NULL;
129 exit_hook_t Arguments::_exit_hook = NULL;
130 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
131
132
133 SystemProperty *Arguments::_java_ext_dirs = NULL;
134 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
135 SystemProperty *Arguments::_sun_boot_library_path = NULL;
136 SystemProperty *Arguments::_java_library_path = NULL;
137 SystemProperty *Arguments::_java_home = NULL;
138 SystemProperty *Arguments::_java_class_path = NULL;
139 SystemProperty *Arguments::_sun_boot_class_path = NULL;
140
141 char* Arguments::_meta_index_path = NULL;
142 char* Arguments::_meta_index_dir = NULL;
143
144 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
145
146 static bool match_option(const JavaVMOption *option, const char* name,
147 const char** tail) {
148 int len = (int)strlen(name);
149 if (strncmp(option->optionString, name, len) == 0) {
150 *tail = option->optionString + len;
151 return true;
152 } else {
153 return false;
154 }
155 }
156
157 #if INCLUDE_JFR
158 // return true on failure
159 static bool match_jfr_option(const JavaVMOption** option) {
160 assert((*option)->optionString != NULL, "invariant");
161 char* tail = NULL;
162 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
163 return Jfr::on_start_flight_recording_option(option, tail);
164 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
165 return Jfr::on_flight_recorder_option(option, tail);
166 }
167 return false;
168 }
169 #endif
170
171 static void logOption(const char* opt) {
172 if (PrintVMOptions) {
173 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
174 }
175 }
176
177 // Process java launcher properties.
178 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
179 // See if sun.java.launcher or sun.java.launcher.pid is defined.
180 // Must do this before setting up other system properties,
181 // as some of them may depend on launcher type.
182 for (int index = 0; index < args->nOptions; index++) {
183 const JavaVMOption* option = args->options + index;
184 const char* tail;
185
186 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
187 process_java_launcher_argument(tail, option->extraInfo);
188 continue;
189 }
190 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
191 _sun_java_launcher_pid = atoi(tail);
192 continue;
193 }
194 }
195 }
196
197 // Initialize system properties key and value.
198 void Arguments::init_system_properties() {
199
200 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
201 "Java Virtual Machine Specification", false));
202 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
203 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
204 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
205
206 // following are JVMTI agent writeable properties.
207 // Properties values are set to NULL and they are
208 // os specific they are initialized in os::init_system_properties_values().
209 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
210 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
211 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
212 _java_library_path = new SystemProperty("java.library.path", NULL, true);
213 _java_home = new SystemProperty("java.home", NULL, true);
214 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
215
216 _java_class_path = new SystemProperty("java.class.path", "", true);
217
218 // Add to System Property list.
219 PropertyList_add(&_system_properties, _java_ext_dirs);
220 PropertyList_add(&_system_properties, _java_endorsed_dirs);
221 PropertyList_add(&_system_properties, _sun_boot_library_path);
222 PropertyList_add(&_system_properties, _java_library_path);
223 PropertyList_add(&_system_properties, _java_home);
224 PropertyList_add(&_system_properties, _java_class_path);
225 PropertyList_add(&_system_properties, _sun_boot_class_path);
226
227 // Set OS specific system properties values
228 os::init_system_properties_values();
229 }
230
231
232 // Update/Initialize System properties after JDK version number is known
233 void Arguments::init_version_specific_system_properties() {
234 enum { bufsz = 16 };
235 char buffer[bufsz];
236 const char* spec_vendor = "Sun Microsystems Inc.";
237 uint32_t spec_version = 0;
238
239 if (JDK_Version::is_gte_jdk17x_version()) {
240 spec_vendor = "Oracle Corporation";
241 spec_version = JDK_Version::current().major_version();
242 }
243 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
244
245 PropertyList_add(&_system_properties,
246 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
247 PropertyList_add(&_system_properties,
248 new SystemProperty("java.vm.specification.version", buffer, false));
249 PropertyList_add(&_system_properties,
250 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
251 }
252
253 /**
254 * Provide a slightly more user-friendly way of eliminating -XX flags.
255 * When a flag is eliminated, it can be added to this list in order to
256 * continue accepting this flag on the command-line, while issuing a warning
257 * and ignoring the value. Once the JDK version reaches the 'accept_until'
258 * limit, we flatly refuse to admit the existence of the flag. This allows
259 * a flag to die correctly over JDK releases using HSX.
260 */
261 typedef struct {
262 const char* name;
263 JDK_Version obsoleted_in; // when the flag went away
264 JDK_Version accept_until; // which version to start denying the existence
265 } ObsoleteFlag;
266
267 static ObsoleteFlag obsolete_jvm_flags[] = {
268 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
269 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
270 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
271 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
272 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
273 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
274 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
275 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
276 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
277 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
278 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
279 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
280 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
281 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
282 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
283 { "DefaultInitialRAMFraction",
284 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
285 { "UseDepthFirstScavengeOrder",
286 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
287 { "HandlePromotionFailure",
288 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
289 { "MaxLiveObjectEvacuationRatio",
290 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
291 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
292 { "UseParallelOldGCCompacting",
293 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
294 { "UseParallelDensePrefixUpdate",
295 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
296 { "UseParallelOldGCDensePrefix",
297 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
298 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
299 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
300 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
302 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
303 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
304 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
305 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
306 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
307 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
308 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
309 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
310 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
311 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
312 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
313 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
314 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
315 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
316 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
317 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
318 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
319 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
320 { "CompilationRepeat", JDK_Version::jdk(8), JDK_Version::jdk(9) },
321 #ifdef PRODUCT
322 { "DesiredMethodLimit",
323 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
324 #endif // PRODUCT
325 { NULL, JDK_Version(0), JDK_Version(0) }
326 };
327
328 // Returns true if the flag is obsolete and fits into the range specified
329 // for being ignored. In the case that the flag is ignored, the 'version'
330 // value is filled in with the version number when the flag became
331 // obsolete so that that value can be displayed to the user.
332 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
333 int i = 0;
334 assert(version != NULL, "Must provide a version buffer");
335 while (obsolete_jvm_flags[i].name != NULL) {
336 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
337 // <flag>=xxx form
338 // [-|+]<flag> form
339 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
340 ((s[0] == '+' || s[0] == '-') &&
341 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
342 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
343 *version = flag_status.obsoleted_in;
344 return true;
345 }
346 }
347 i++;
348 }
349 return false;
350 }
351
352 // Constructs the system class path (aka boot class path) from the following
353 // components, in order:
354 //
355 // prefix // from -Xbootclasspath/p:...
356 // endorsed // the expansion of -Djava.endorsed.dirs=...
357 // base // from os::get_system_properties() or -Xbootclasspath=
358 // suffix // from -Xbootclasspath/a:...
359 //
360 // java.endorsed.dirs is a list of directories; any jar or zip files in the
361 // directories are added to the sysclasspath just before the base.
362 //
363 // This could be AllStatic, but it isn't needed after argument processing is
364 // complete.
365 class SysClassPath: public StackObj {
366 public:
367 SysClassPath(const char* base);
368 ~SysClassPath();
369
370 inline void set_base(const char* base);
371 inline void add_prefix(const char* prefix);
372 inline void add_suffix_to_prefix(const char* suffix);
373 inline void add_suffix(const char* suffix);
374 inline void reset_path(const char* base);
375
376 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
377 // property. Must be called after all command-line arguments have been
378 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
379 // combined_path().
380 void expand_endorsed();
381
382 inline const char* get_base() const { return _items[_scp_base]; }
383 inline const char* get_prefix() const { return _items[_scp_prefix]; }
384 inline const char* get_suffix() const { return _items[_scp_suffix]; }
385 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
386
387 // Combine all the components into a single c-heap-allocated string; caller
388 // must free the string if/when no longer needed.
389 char* combined_path();
390
391 private:
392 // Utility routines.
393 static char* add_to_path(const char* path, const char* str, bool prepend);
394 static char* add_jars_to_path(char* path, const char* directory);
395
396 inline void reset_item_at(int index);
397
398 // Array indices for the items that make up the sysclasspath. All except the
399 // base are allocated in the C heap and freed by this class.
400 enum {
401 _scp_prefix, // from -Xbootclasspath/p:...
402 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
403 _scp_base, // the default sysclasspath
404 _scp_suffix, // from -Xbootclasspath/a:...
405 _scp_nitems // the number of items, must be last.
406 };
407
408 const char* _items[_scp_nitems];
409 DEBUG_ONLY(bool _expansion_done;)
410 };
411
412 SysClassPath::SysClassPath(const char* base) {
413 memset(_items, 0, sizeof(_items));
414 _items[_scp_base] = base;
415 DEBUG_ONLY(_expansion_done = false;)
416 }
417
418 SysClassPath::~SysClassPath() {
419 // Free everything except the base.
420 for (int i = 0; i < _scp_nitems; ++i) {
421 if (i != _scp_base) reset_item_at(i);
422 }
423 DEBUG_ONLY(_expansion_done = false;)
424 }
425
426 inline void SysClassPath::set_base(const char* base) {
427 _items[_scp_base] = base;
428 }
429
430 inline void SysClassPath::add_prefix(const char* prefix) {
431 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
432 }
433
434 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
435 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
436 }
437
438 inline void SysClassPath::add_suffix(const char* suffix) {
439 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
440 }
441
442 inline void SysClassPath::reset_item_at(int index) {
443 assert(index < _scp_nitems && index != _scp_base, "just checking");
444 if (_items[index] != NULL) {
445 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
446 _items[index] = NULL;
447 }
448 }
449
450 inline void SysClassPath::reset_path(const char* base) {
451 // Clear the prefix and suffix.
452 reset_item_at(_scp_prefix);
453 reset_item_at(_scp_suffix);
454 set_base(base);
455 }
456
457 //------------------------------------------------------------------------------
458
459 void SysClassPath::expand_endorsed() {
460 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
461
462 const char* path = Arguments::get_property("java.endorsed.dirs");
463 if (path == NULL) {
464 path = Arguments::get_endorsed_dir();
465 assert(path != NULL, "no default for java.endorsed.dirs");
466 }
467
468 char* expanded_path = NULL;
469 const char separator = *os::path_separator();
470 const char* const end = path + strlen(path);
471 while (path < end) {
472 const char* tmp_end = strchr(path, separator);
473 if (tmp_end == NULL) {
474 expanded_path = add_jars_to_path(expanded_path, path);
475 path = end;
476 } else {
477 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
478 memcpy(dirpath, path, tmp_end - path);
479 dirpath[tmp_end - path] = '\0';
480 expanded_path = add_jars_to_path(expanded_path, dirpath);
481 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
482 path = tmp_end + 1;
483 }
484 }
485 _items[_scp_endorsed] = expanded_path;
486 DEBUG_ONLY(_expansion_done = true;)
487 }
488
489 // Combine the bootclasspath elements, some of which may be null, into a single
490 // c-heap-allocated string.
491 char* SysClassPath::combined_path() {
492 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
493 assert(_expansion_done, "must call expand_endorsed() first.");
494
495 size_t lengths[_scp_nitems];
496 size_t total_len = 0;
497
498 const char separator = *os::path_separator();
499
500 // Get the lengths.
501 int i;
502 for (i = 0; i < _scp_nitems; ++i) {
503 if (_items[i] != NULL) {
504 lengths[i] = strlen(_items[i]);
505 // Include space for the separator char (or a NULL for the last item).
506 total_len += lengths[i] + 1;
507 }
508 }
509 assert(total_len > 0, "empty sysclasspath not allowed");
510
511 // Copy the _items to a single string.
512 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
513 char* cp_tmp = cp;
514 for (i = 0; i < _scp_nitems; ++i) {
515 if (_items[i] != NULL) {
516 memcpy(cp_tmp, _items[i], lengths[i]);
517 cp_tmp += lengths[i];
518 *cp_tmp++ = separator;
519 }
520 }
521 *--cp_tmp = '\0'; // Replace the extra separator.
522 return cp;
523 }
524
525 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
526 char*
527 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
528 char *cp;
529
530 assert(str != NULL, "just checking");
531 if (path == NULL) {
532 size_t len = strlen(str) + 1;
533 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
534 memcpy(cp, str, len); // copy the trailing null
535 } else {
536 const char separator = *os::path_separator();
537 size_t old_len = strlen(path);
538 size_t str_len = strlen(str);
539 size_t len = old_len + str_len + 2;
540
541 if (prepend) {
542 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
543 char* cp_tmp = cp;
544 memcpy(cp_tmp, str, str_len);
545 cp_tmp += str_len;
546 *cp_tmp = separator;
547 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
548 FREE_C_HEAP_ARRAY(char, path, mtInternal);
549 } else {
550 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
551 char* cp_tmp = cp + old_len;
552 *cp_tmp = separator;
553 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
554 }
555 }
556 return cp;
557 }
558
559 // Scan the directory and append any jar or zip files found to path.
560 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
561 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
562 DIR* dir = os::opendir(directory);
563 if (dir == NULL) return path;
564
565 char dir_sep[2] = { '\0', '\0' };
566 size_t directory_len = strlen(directory);
567 const char fileSep = *os::file_separator();
568 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
569
570 /* Scan the directory for jars/zips, appending them to path. */
571 struct dirent *entry;
572 while ((entry = os::readdir(dir)) != NULL) {
573 const char* name = entry->d_name;
574 const char* ext = name + strlen(name) - 4;
575 bool isJarOrZip = ext > name &&
576 (os::file_name_strcmp(ext, ".jar") == 0 ||
577 os::file_name_strcmp(ext, ".zip") == 0);
578 if (isJarOrZip) {
579 size_t length = directory_len + 2 + strlen(name);
580 char* jarpath = NEW_C_HEAP_ARRAY(char, length, mtInternal);
581 jio_snprintf(jarpath, length, "%s%s%s", directory, dir_sep, name);
582 path = add_to_path(path, jarpath, false);
583 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
584 }
585 }
586 os::closedir(dir);
587 return path;
588 }
589
590 // Parses a memory size specification string.
591 static bool atomull(const char *s, julong* result) {
592 julong n = 0;
593 int args_read = sscanf(s, JULONG_FORMAT, &n);
594 if (args_read != 1) {
595 return false;
596 }
597 while (*s != '\0' && isdigit(*s)) {
598 s++;
599 }
600 // 4705540: illegal if more characters are found after the first non-digit
601 if (strlen(s) > 1) {
602 return false;
603 }
604 switch (*s) {
605 case 'T': case 't':
606 *result = n * G * K;
607 // Check for overflow.
608 if (*result/((julong)G * K) != n) return false;
609 return true;
610 case 'G': case 'g':
611 *result = n * G;
612 if (*result/G != n) return false;
613 return true;
614 case 'M': case 'm':
615 *result = n * M;
616 if (*result/M != n) return false;
617 return true;
618 case 'K': case 'k':
619 *result = n * K;
620 if (*result/K != n) return false;
621 return true;
622 case '\0':
623 *result = n;
624 return true;
625 default:
626 return false;
627 }
628 }
629
630 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
631 if (size < min_size) return arg_too_small;
632 // Check that size will fit in a size_t (only relevant on 32-bit)
633 if (size > max_uintx) return arg_too_big;
634 return arg_in_range;
635 }
636
637 // Describe an argument out of range error
638 void Arguments::describe_range_error(ArgsRange errcode) {
639 switch(errcode) {
640 case arg_too_big:
641 jio_fprintf(defaultStream::error_stream(),
642 "The specified size exceeds the maximum "
643 "representable size.\n");
644 break;
645 case arg_too_small:
646 case arg_unreadable:
647 case arg_in_range:
648 // do nothing for now
649 break;
650 default:
651 ShouldNotReachHere();
652 }
653 }
654
655 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
656 return CommandLineFlags::boolAtPut(name, &value, origin);
657 }
658
659 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
660 double v;
661 if (sscanf(value, "%lf", &v) != 1) {
662 return false;
663 }
664
665 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
666 return true;
667 }
668 return false;
669 }
670
671 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
672 julong v;
673 intx intx_v;
674 bool is_neg = false;
675 // Check the sign first since atomull() parses only unsigned values.
676 if (*value == '-') {
677 if (!CommandLineFlags::intxAt(name, &intx_v)) {
678 return false;
679 }
680 value++;
681 is_neg = true;
682 }
683 if (!atomull(value, &v)) {
684 return false;
685 }
686 intx_v = (intx) v;
687 if (is_neg) {
688 intx_v = -intx_v;
689 }
690 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
691 return true;
692 }
693 uintx uintx_v = (uintx) v;
694 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
695 return true;
696 }
697 uint64_t uint64_t_v = (uint64_t) v;
698 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
699 return true;
700 }
701 return false;
702 }
703
704 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
705 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
706 // Contract: CommandLineFlags always returns a pointer that needs freeing.
707 FREE_C_HEAP_ARRAY(char, value, mtInternal);
708 return true;
709 }
710
711 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
712 const char* old_value = "";
713 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
714 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
715 size_t new_len = strlen(new_value);
716 const char* value;
717 char* free_this_too = NULL;
718 if (old_len == 0) {
719 value = new_value;
720 } else if (new_len == 0) {
721 value = old_value;
722 } else {
723 size_t length = old_len + 1 + new_len + 1;
724 char* buf = NEW_C_HEAP_ARRAY(char, length, mtInternal);
725 // each new setting adds another LINE to the switch:
726 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
727 value = buf;
728 free_this_too = buf;
729 }
730 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
731 // CommandLineFlags always returns a pointer that needs freeing.
732 FREE_C_HEAP_ARRAY(char, value, mtInternal);
733 if (free_this_too != NULL) {
734 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
735 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
736 }
737 return true;
738 }
739
740 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
741
742 // range of acceptable characters spelled out for portability reasons
743 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
744 #define BUFLEN 255
745 char name[BUFLEN+1];
746 char dummy;
747
748 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
749 return set_bool_flag(name, false, origin);
750 }
751 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
752 return set_bool_flag(name, true, origin);
753 }
754
755 char punct;
756 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
757 const char* value = strchr(arg, '=') + 1;
758 Flag* flag = Flag::find_flag(name, strlen(name));
759 if (flag != NULL && flag->is_ccstr()) {
760 if (flag->ccstr_accumulates()) {
761 return append_to_string_flag(name, value, origin);
762 } else {
763 if (value[0] == '\0') {
764 value = NULL;
765 }
766 return set_string_flag(name, value, origin);
767 }
768 }
769 }
770
771 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
772 const char* value = strchr(arg, '=') + 1;
773 // -XX:Foo:=xxx will reset the string flag to the given value.
774 if (value[0] == '\0') {
775 value = NULL;
776 }
777 return set_string_flag(name, value, origin);
778 }
779
780 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
781 #define SIGNED_NUMBER_RANGE "[-0123456789]"
782 #define NUMBER_RANGE "[0123456789]"
783 char value[BUFLEN + 1];
784 char value2[BUFLEN + 1];
785 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
786 // Looks like a floating-point number -- try again with more lenient format string
787 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
788 return set_fp_numeric_flag(name, value, origin);
789 }
790 }
791
792 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
793 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
794 return set_numeric_flag(name, value, origin);
795 }
796
797 return false;
798 }
799
800 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
801 assert(bldarray != NULL, "illegal argument");
802
803 if (arg == NULL) {
804 return;
805 }
806
807 int new_count = *count + 1;
808
809 // expand the array and add arg to the last element
810 if (*bldarray == NULL) {
811 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
812 } else {
813 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
814 }
815 (*bldarray)[*count] = strdup(arg);
816 *count = new_count;
817 }
818
819 void Arguments::build_jvm_args(const char* arg) {
820 add_string(&_jvm_args_array, &_num_jvm_args, arg);
821 }
822
823 void Arguments::build_jvm_flags(const char* arg) {
824 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
825 }
826
827 // utility function to return a string that concatenates all
828 // strings in a given char** array
829 const char* Arguments::build_resource_string(char** args, int count) {
830 if (args == NULL || count == 0) {
831 return NULL;
832 }
833 size_t length = 0;
834 for (int i = 0; i < count; i++) {
835 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
836 }
837 char* s = NEW_RESOURCE_ARRAY(char, length);
838 char* dst = s;
839 for (int j = 0; j < count; j++) {
840 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
841 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
842 dst += offset;
843 length -= offset;
844 }
845 return (const char*) s;
846 }
847
848 void Arguments::print_on(outputStream* st) {
849 st->print_cr("VM Arguments:");
850 if (num_jvm_flags() > 0) {
851 st->print("jvm_flags: "); print_jvm_flags_on(st);
852 }
853 if (num_jvm_args() > 0) {
854 st->print("jvm_args: "); print_jvm_args_on(st);
855 }
856 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
857 if (_java_class_path != NULL) {
858 char* path = _java_class_path->value();
859 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
860 }
861 st->print_cr("Launcher Type: %s", _sun_java_launcher);
862 }
863
864 void Arguments::print_jvm_flags_on(outputStream* st) {
865 if (_num_jvm_flags > 0) {
866 for (int i=0; i < _num_jvm_flags; i++) {
867 st->print("%s ", _jvm_flags_array[i]);
868 }
869 st->cr();
870 }
871 }
872
873 void Arguments::print_jvm_args_on(outputStream* st) {
874 if (_num_jvm_args > 0) {
875 for (int i=0; i < _num_jvm_args; i++) {
876 st->print("%s ", _jvm_args_array[i]);
877 }
878 st->cr();
879 }
880 }
881
882 bool Arguments::process_argument(const char* arg,
883 jboolean ignore_unrecognized, Flag::Flags origin) {
884
885 JDK_Version since = JDK_Version();
886
887 if (parse_argument(arg, origin) || ignore_unrecognized) {
888 return true;
889 }
890
891 bool has_plus_minus = (*arg == '+' || *arg == '-');
892 const char* const argname = has_plus_minus ? arg + 1 : arg;
893 if (is_newly_obsolete(arg, &since)) {
894 char version[256];
895 since.to_string(version, sizeof(version));
896 warning("ignoring option %s; support was removed in %s", argname, version);
897 return true;
898 }
899
900 // For locked flags, report a custom error message if available.
901 // Otherwise, report the standard unrecognized VM option.
902
903 size_t arg_len;
904 const char* equal_sign = strchr(argname, '=');
905 if (equal_sign == NULL) {
906 arg_len = strlen(argname);
907 } else {
908 arg_len = equal_sign - argname;
909 }
910
911 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
912 if (found_flag != NULL) {
913 char locked_message_buf[BUFLEN];
914 found_flag->get_locked_message(locked_message_buf, BUFLEN);
915 if (strlen(locked_message_buf) == 0) {
916 if (found_flag->is_bool() && !has_plus_minus) {
917 jio_fprintf(defaultStream::error_stream(),
918 "Missing +/- setting for VM option '%s'\n", argname);
919 } else if (!found_flag->is_bool() && has_plus_minus) {
920 jio_fprintf(defaultStream::error_stream(),
921 "Unexpected +/- setting in VM option '%s'\n", argname);
922 } else {
923 jio_fprintf(defaultStream::error_stream(),
924 "Improperly specified VM option '%s'\n", argname);
925 }
926 } else {
927 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
928 }
929 } else {
930 jio_fprintf(defaultStream::error_stream(),
931 "Unrecognized VM option '%s'\n", argname);
932 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
933 if (fuzzy_matched != NULL) {
934 jio_fprintf(defaultStream::error_stream(),
935 "Did you mean '%s%s%s'?\n",
936 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
937 fuzzy_matched->_name,
938 (fuzzy_matched->is_bool()) ? "" : "=<value>");
939 }
940 }
941
942 // allow for commandline "commenting out" options like -XX:#+Verbose
943 return arg[0] == '#';
944 }
945
946 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
947 FILE* stream = fopen(file_name, "rb");
948 if (stream == NULL) {
949 if (should_exist) {
950 jio_fprintf(defaultStream::error_stream(),
951 "Could not open settings file %s\n", file_name);
952 return false;
953 } else {
954 return true;
955 }
956 }
957
958 char token[1024];
959 int pos = 0;
960
961 bool in_white_space = true;
962 bool in_comment = false;
963 bool in_quote = false;
964 char quote_c = 0;
965 bool result = true;
966
967 int c = getc(stream);
968 while(c != EOF && pos < (int)(sizeof(token)-1)) {
969 if (in_white_space) {
970 if (in_comment) {
971 if (c == '\n') in_comment = false;
972 } else {
973 if (c == '#') in_comment = true;
974 else if (!isspace(c)) {
975 in_white_space = false;
976 token[pos++] = c;
977 }
978 }
979 } else {
980 if (c == '\n' || (!in_quote && isspace(c))) {
981 // token ends at newline, or at unquoted whitespace
982 // this allows a way to include spaces in string-valued options
983 token[pos] = '\0';
984 logOption(token);
985 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
986 build_jvm_flags(token);
987 pos = 0;
988 in_white_space = true;
989 in_quote = false;
990 } else if (!in_quote && (c == '\'' || c == '"')) {
991 in_quote = true;
992 quote_c = c;
993 } else if (in_quote && (c == quote_c)) {
994 in_quote = false;
995 } else {
996 token[pos++] = c;
997 }
998 }
999 c = getc(stream);
1000 }
1001 if (pos > 0) {
1002 token[pos] = '\0';
1003 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1004 build_jvm_flags(token);
1005 }
1006 fclose(stream);
1007 return result;
1008 }
1009
1010 //=============================================================================================================
1011 // Parsing of properties (-D)
1012
1013 const char* Arguments::get_property(const char* key) {
1014 return PropertyList_get_value(system_properties(), key);
1015 }
1016
1017 bool Arguments::add_property(const char* prop) {
1018 const char* eq = strchr(prop, '=');
1019 char* key;
1020 // ns must be static--its address may be stored in a SystemProperty object.
1021 const static char ns[1] = {0};
1022 char* value = (char *)ns;
1023
1024 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1025 key = AllocateHeap(key_len + 1, mtInternal);
1026 strncpy(key, prop, key_len);
1027 key[key_len] = '\0';
1028
1029 if (eq != NULL) {
1030 size_t value_len = strlen(prop) - key_len - 1;
1031 value = AllocateHeap(value_len + 1, mtInternal);
1032 strncpy(value, &prop[key_len + 1], value_len + 1);
1033 }
1034
1035 if (strcmp(key, "java.compiler") == 0) {
1036 process_java_compiler_argument(value);
1037 FreeHeap(key);
1038 if (eq != NULL) {
1039 FreeHeap(value);
1040 }
1041 return true;
1042 } else if (strcmp(key, "sun.java.command") == 0) {
1043 _java_command = value;
1044
1045 // Record value in Arguments, but let it get passed to Java.
1046 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1047 // launcher.pid property is private and is processed
1048 // in process_sun_java_launcher_properties();
1049 // the sun.java.launcher property is passed on to the java application
1050 FreeHeap(key);
1051 if (eq != NULL) {
1052 FreeHeap(value);
1053 }
1054 return true;
1055 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1056 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1057 // its value without going through the property list or making a Java call.
1058 _java_vendor_url_bug = value;
1059 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1060 PropertyList_unique_add(&_system_properties, key, value, true);
1061 return true;
1062 }
1063 // Create new property and add at the end of the list
1064 PropertyList_unique_add(&_system_properties, key, value);
1065 return true;
1066 }
1067
1068 //===========================================================================================================
1069 // Setting int/mixed/comp mode flags
1070
1071 void Arguments::set_mode_flags(Mode mode) {
1072 // Set up default values for all flags.
1073 // If you add a flag to any of the branches below,
1074 // add a default value for it here.
1075 set_java_compiler(false);
1076 _mode = mode;
1077
1078 // Ensure Agent_OnLoad has the correct initial values.
1079 // This may not be the final mode; mode may change later in onload phase.
1080 PropertyList_unique_add(&_system_properties, "java.vm.info",
1081 (char*)VM_Version::vm_info_string(), false);
1082
1083 UseInterpreter = true;
1084 UseCompiler = true;
1085 UseLoopCounter = true;
1086
1087 #ifndef ZERO
1088 // Turn these off for mixed and comp. Leave them on for Zero.
1089 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1090 UseFastAccessorMethods = (mode == _int);
1091 }
1092 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1093 UseFastEmptyMethods = (mode == _int);
1094 }
1095 #endif
1096
1097 // Default values may be platform/compiler dependent -
1098 // use the saved values
1099 ClipInlining = Arguments::_ClipInlining;
1100 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1101 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1102 BackgroundCompilation = Arguments::_BackgroundCompilation;
1103
1104 // Change from defaults based on mode
1105 switch (mode) {
1106 default:
1107 ShouldNotReachHere();
1108 break;
1109 case _int:
1110 UseCompiler = false;
1111 UseLoopCounter = false;
1112 AlwaysCompileLoopMethods = false;
1113 UseOnStackReplacement = false;
1114 break;
1115 case _mixed:
1116 // same as default
1117 break;
1118 case _comp:
1119 UseInterpreter = false;
1120 BackgroundCompilation = false;
1121 ClipInlining = false;
1122 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1123 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1124 // compile a level 4 (C2) and then continue executing it.
1125 if (TieredCompilation) {
1126 Tier3InvokeNotifyFreqLog = 0;
1127 Tier4InvocationThreshold = 0;
1128 }
1129 break;
1130 }
1131 }
1132
1133 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1134 // Conflict: required to use shared spaces (-Xshare:on), but
1135 // incompatible command line options were chosen.
1136
1137 static void no_shared_spaces(const char* message) {
1138 if (RequireSharedSpaces) {
1139 jio_fprintf(defaultStream::error_stream(),
1140 "Class data sharing is inconsistent with other specified options.\n");
1141 vm_exit_during_initialization("Unable to use shared archive.", message);
1142 } else {
1143 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1144 }
1145 }
1146 #endif
1147
1148 void Arguments::set_tiered_flags() {
1149 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1150 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1151 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1152 }
1153 if (CompilationPolicyChoice < 2) {
1154 vm_exit_during_initialization(
1155 "Incompatible compilation policy selected", NULL);
1156 }
1157 // Increase the code cache size - tiered compiles a lot more.
1158 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1159 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1160 }
1161 if (!UseInterpreter) { // -Xcomp
1162 Tier3InvokeNotifyFreqLog = 0;
1163 Tier4InvocationThreshold = 0;
1164 }
1165 }
1166
1167 /**
1168 * Returns the minimum number of compiler threads needed to run the JVM. The following
1169 * configurations are possible.
1170 *
1171 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1172 * compiler threads is 0.
1173 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1174 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1175 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1176 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1177 * C1 can be used, so the minimum number of compiler threads is 1.
1178 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1179 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1180 * the minimum number of compiler threads is 2.
1181 */
1182 int Arguments::get_min_number_of_compiler_threads() {
1183 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1184 return 0; // case 1
1185 #else
1186 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1187 return 1; // case 2 or case 3
1188 }
1189 return 2; // case 4 (tiered)
1190 #endif
1191 }
1192
1193 #if INCLUDE_ALL_GCS
1194 static void disable_adaptive_size_policy(const char* collector_name) {
1195 if (UseAdaptiveSizePolicy) {
1196 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1197 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1198 collector_name);
1199 }
1200 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1201 }
1202 }
1203
1204 void Arguments::set_parnew_gc_flags() {
1205 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1206 "control point invariant");
1207 assert(UseParNewGC, "Error");
1208
1209 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1210 disable_adaptive_size_policy("UseParNewGC");
1211
1212 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1213 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1214 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1215 } else if (ParallelGCThreads == 0) {
1216 jio_fprintf(defaultStream::error_stream(),
1217 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1218 vm_exit(1);
1219 }
1220
1221 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1222 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1223 // we set them to 1024 and 1024.
1224 // See CR 6362902.
1225 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1226 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1227 }
1228 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1229 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1230 }
1231
1232 // AlwaysTenure flag should make ParNew promote all at first collection.
1233 // See CR 6362902.
1234 if (AlwaysTenure) {
1235 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1236 }
1237 // When using compressed oops, we use local overflow stacks,
1238 // rather than using a global overflow list chained through
1239 // the klass word of the object's pre-image.
1240 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1241 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1242 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1243 }
1244 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1245 }
1246 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1247 }
1248
1249 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1250 // sparc/solaris for certain applications, but would gain from
1251 // further optimization and tuning efforts, and would almost
1252 // certainly gain from analysis of platform and environment.
1253 void Arguments::set_cms_and_parnew_gc_flags() {
1254 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1255 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1256
1257 // If we are using CMS, we prefer to UseParNewGC,
1258 // unless explicitly forbidden.
1259 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1260 FLAG_SET_ERGO(bool, UseParNewGC, true);
1261 }
1262
1263 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1264 disable_adaptive_size_policy("UseConcMarkSweepGC");
1265
1266 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1267 // as needed.
1268 if (UseParNewGC) {
1269 set_parnew_gc_flags();
1270 }
1271
1272 size_t max_heap = align_size_down(MaxHeapSize,
1273 CardTableRS::ct_max_alignment_constraint());
1274
1275 // Now make adjustments for CMS
1276 intx tenuring_default = (intx)6;
1277 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1278
1279 // Preferred young gen size for "short" pauses:
1280 // upper bound depends on # of threads and NewRatio.
1281 const uintx parallel_gc_threads =
1282 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1283 const size_t preferred_max_new_size_unaligned =
1284 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1285 size_t preferred_max_new_size =
1286 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1287
1288 // Unless explicitly requested otherwise, size young gen
1289 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1290
1291 // If either MaxNewSize or NewRatio is set on the command line,
1292 // assume the user is trying to set the size of the young gen.
1293 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1294
1295 // Set MaxNewSize to our calculated preferred_max_new_size unless
1296 // NewSize was set on the command line and it is larger than
1297 // preferred_max_new_size.
1298 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1299 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1300 } else {
1301 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1302 }
1303 if (PrintGCDetails && Verbose) {
1304 // Too early to use gclog_or_tty
1305 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1306 }
1307
1308 // Code along this path potentially sets NewSize and OldSize
1309 if (PrintGCDetails && Verbose) {
1310 // Too early to use gclog_or_tty
1311 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1312 " initial_heap_size: " SIZE_FORMAT
1313 " max_heap: " SIZE_FORMAT,
1314 min_heap_size(), InitialHeapSize, max_heap);
1315 }
1316 size_t min_new = preferred_max_new_size;
1317 if (FLAG_IS_CMDLINE(NewSize)) {
1318 min_new = NewSize;
1319 }
1320 if (max_heap > min_new && min_heap_size() > min_new) {
1321 // Unless explicitly requested otherwise, make young gen
1322 // at least min_new, and at most preferred_max_new_size.
1323 if (FLAG_IS_DEFAULT(NewSize)) {
1324 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1325 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1326 if (PrintGCDetails && Verbose) {
1327 // Too early to use gclog_or_tty
1328 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1329 }
1330 }
1331 // Unless explicitly requested otherwise, size old gen
1332 // so it's NewRatio x of NewSize.
1333 if (FLAG_IS_DEFAULT(OldSize)) {
1334 if (max_heap > NewSize) {
1335 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1336 if (PrintGCDetails && Verbose) {
1337 // Too early to use gclog_or_tty
1338 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1339 }
1340 }
1341 }
1342 }
1343 }
1344 // Unless explicitly requested otherwise, definitely
1345 // promote all objects surviving "tenuring_default" scavenges.
1346 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1347 FLAG_IS_DEFAULT(SurvivorRatio)) {
1348 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1349 }
1350 // If we decided above (or user explicitly requested)
1351 // `promote all' (via MaxTenuringThreshold := 0),
1352 // prefer minuscule survivor spaces so as not to waste
1353 // space for (non-existent) survivors
1354 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1355 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1356 }
1357 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1358 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1359 // This is done in order to make ParNew+CMS configuration to work
1360 // with YoungPLABSize and OldPLABSize options.
1361 // See CR 6362902.
1362 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1363 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1364 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1365 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1366 // the value (either from the command line or ergonomics) of
1367 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1368 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1369 } else {
1370 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1371 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1372 // we'll let it to take precedence.
1373 jio_fprintf(defaultStream::error_stream(),
1374 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1375 " options are specified for the CMS collector."
1376 " CMSParPromoteBlocksToClaim will take precedence.\n");
1377 }
1378 }
1379 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1380 // OldPLAB sizing manually turned off: Use a larger default setting,
1381 // unless it was manually specified. This is because a too-low value
1382 // will slow down scavenges.
1383 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1384 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1385 }
1386 }
1387 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1388 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1389 // If either of the static initialization defaults have changed, note this
1390 // modification.
1391 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1392 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1393 }
1394
1395 if (PrintGCDetails && Verbose) {
1396 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1397 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1398 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1399 }
1400 }
1401 #endif // INCLUDE_ALL_GCS
1402
1403 void set_object_alignment() {
1404 // Object alignment.
1405 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1406 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1407 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1408 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1409 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1410 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1411
1412 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1413 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1414
1415 // Oop encoding heap max
1416 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1417
1418 #if INCLUDE_ALL_GCS
1419 // Set CMS global values
1420 CompactibleFreeListSpace::set_cms_values();
1421 #endif // INCLUDE_ALL_GCS
1422 }
1423
1424 bool verify_object_alignment() {
1425 // Object alignment.
1426 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1427 jio_fprintf(defaultStream::error_stream(),
1428 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1429 (int)ObjectAlignmentInBytes);
1430 return false;
1431 }
1432 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1433 jio_fprintf(defaultStream::error_stream(),
1434 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1435 (int)ObjectAlignmentInBytes, BytesPerLong);
1436 return false;
1437 }
1438 // It does not make sense to have big object alignment
1439 // since a space lost due to alignment will be greater
1440 // then a saved space from compressed oops.
1441 if ((int)ObjectAlignmentInBytes > 256) {
1442 jio_fprintf(defaultStream::error_stream(),
1443 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1444 (int)ObjectAlignmentInBytes);
1445 return false;
1446 }
1447 // In case page size is very small.
1448 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1449 jio_fprintf(defaultStream::error_stream(),
1450 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1451 (int)ObjectAlignmentInBytes, os::vm_page_size());
1452 return false;
1453 }
1454 if(SurvivorAlignmentInBytes == 0) {
1455 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1456 } else {
1457 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1458 jio_fprintf(defaultStream::error_stream(),
1459 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1460 (int)SurvivorAlignmentInBytes);
1461 return false;
1462 }
1463 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1464 jio_fprintf(defaultStream::error_stream(),
1465 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1466 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1467 return false;
1468 }
1469 }
1470 return true;
1471 }
1472
1473 size_t Arguments::max_heap_for_compressed_oops() {
1474 // Avoid sign flip.
1475 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1476 // We need to fit both the NULL page and the heap into the memory budget, while
1477 // keeping alignment constraints of the heap. To guarantee the latter, as the
1478 // NULL page is located before the heap, we pad the NULL page to the conservative
1479 // maximum alignment that the GC may ever impose upon the heap.
1480 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1481 _conservative_max_heap_alignment);
1482
1483 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1484 NOT_LP64(ShouldNotReachHere(); return 0);
1485 }
1486
1487 bool Arguments::should_auto_select_low_pause_collector() {
1488 if (UseAutoGCSelectPolicy &&
1489 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1490 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1491 if (PrintGCDetails) {
1492 // Cannot use gclog_or_tty yet.
1493 tty->print_cr("Automatic selection of the low pause collector"
1494 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1495 }
1496 return true;
1497 }
1498 return false;
1499 }
1500
1501 void Arguments::set_use_compressed_oops() {
1502 #ifndef ZERO
1503 #ifdef _LP64
1504 // MaxHeapSize is not set up properly at this point, but
1505 // the only value that can override MaxHeapSize if we are
1506 // to use UseCompressedOops is InitialHeapSize.
1507 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1508
1509 if (max_heap_size <= max_heap_for_compressed_oops()) {
1510 #if !defined(COMPILER1) || defined(TIERED)
1511 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1512 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1513 }
1514 #endif
1515 #ifdef _WIN64
1516 if (UseLargePages && UseCompressedOops) {
1517 // Cannot allocate guard pages for implicit checks in indexed addressing
1518 // mode, when large pages are specified on windows.
1519 // This flag could be switched ON if narrow oop base address is set to 0,
1520 // see code in Universe::initialize_heap().
1521 Universe::set_narrow_oop_use_implicit_null_checks(false);
1522 }
1523 #endif // _WIN64
1524 } else {
1525 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1526 warning("Max heap size too large for Compressed Oops");
1527 FLAG_SET_DEFAULT(UseCompressedOops, false);
1528 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1529 }
1530 }
1531 #endif // _LP64
1532 #endif // ZERO
1533 }
1534
1535
1536 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1537 // set_use_compressed_oops().
1538 void Arguments::set_use_compressed_klass_ptrs() {
1539 #ifndef ZERO
1540 #ifdef _LP64
1541 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1542 if (!UseCompressedOops) {
1543 if (UseCompressedClassPointers) {
1544 warning("UseCompressedClassPointers requires UseCompressedOops");
1545 }
1546 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1547 } else {
1548 // Turn on UseCompressedClassPointers too
1549 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1550 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1551 }
1552 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1553 if (UseCompressedClassPointers) {
1554 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1555 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1556 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1557 }
1558 }
1559 }
1560 #endif // _LP64
1561 #endif // !ZERO
1562 }
1563
1564 void Arguments::set_conservative_max_heap_alignment() {
1565 // The conservative maximum required alignment for the heap is the maximum of
1566 // the alignments imposed by several sources: any requirements from the heap
1567 // itself, the collector policy and the maximum page size we may run the VM
1568 // with.
1569 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1570 #if INCLUDE_ALL_GCS
1571 if (UseParallelGC) {
1572 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1573 } else if (UseG1GC) {
1574 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1575 }
1576 #endif // INCLUDE_ALL_GCS
1577 _conservative_max_heap_alignment = MAX4(heap_alignment,
1578 (size_t)os::vm_allocation_granularity(),
1579 os::max_page_size(),
1580 CollectorPolicy::compute_heap_alignment());
1581 }
1582
1583 void Arguments::select_gc_ergonomically() {
1584 if (os::is_server_class_machine()) {
1585 if (should_auto_select_low_pause_collector()) {
1586 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1587 } else {
1588 FLAG_SET_ERGO(bool, UseParallelGC, true);
1589 }
1590 }
1591 }
1592
1593 void Arguments::select_gc() {
1594 if (!gc_selected()) {
1595 select_gc_ergonomically();
1596 }
1597 }
1598
1599 void Arguments::set_ergonomics_flags() {
1600 select_gc();
1601
1602 #ifdef COMPILER2
1603 // Shared spaces work fine with other GCs but causes bytecode rewriting
1604 // to be disabled, which hurts interpreter performance and decreases
1605 // server performance. When -server is specified, keep the default off
1606 // unless it is asked for. Future work: either add bytecode rewriting
1607 // at link time, or rewrite bytecodes in non-shared methods.
1608 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1609 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1610 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1611 }
1612 #endif
1613
1614 set_conservative_max_heap_alignment();
1615
1616 #ifndef ZERO
1617 #ifdef _LP64
1618 set_use_compressed_oops();
1619
1620 // set_use_compressed_klass_ptrs() must be called after calling
1621 // set_use_compressed_oops().
1622 set_use_compressed_klass_ptrs();
1623
1624 // Also checks that certain machines are slower with compressed oops
1625 // in vm_version initialization code.
1626 #endif // _LP64
1627 #endif // !ZERO
1628 }
1629
1630 void Arguments::set_parallel_gc_flags() {
1631 assert(UseParallelGC || UseParallelOldGC, "Error");
1632 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1633 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1634 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1635 }
1636 FLAG_SET_DEFAULT(UseParallelGC, true);
1637
1638 // If no heap maximum was requested explicitly, use some reasonable fraction
1639 // of the physical memory, up to a maximum of 1GB.
1640 FLAG_SET_DEFAULT(ParallelGCThreads,
1641 Abstract_VM_Version::parallel_worker_threads());
1642 if (ParallelGCThreads == 0) {
1643 jio_fprintf(defaultStream::error_stream(),
1644 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1645 vm_exit(1);
1646 }
1647
1648 if (UseAdaptiveSizePolicy) {
1649 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1650 // unless the user actually sets these flags.
1651 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1652 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1653 _min_heap_free_ratio = MinHeapFreeRatio;
1654 }
1655 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1656 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1657 _max_heap_free_ratio = MaxHeapFreeRatio;
1658 }
1659 }
1660
1661 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1662 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1663 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1664 // See CR 6362902 for details.
1665 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1666 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1667 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1668 }
1669 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1670 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1671 }
1672 }
1673
1674 if (UseParallelOldGC) {
1675 // Par compact uses lower default values since they are treated as
1676 // minimums. These are different defaults because of the different
1677 // interpretation and are not ergonomically set.
1678 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1679 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1680 }
1681 }
1682 }
1683
1684 void Arguments::set_g1_gc_flags() {
1685 assert(UseG1GC, "Error");
1686 #ifdef COMPILER1
1687 FastTLABRefill = false;
1688 #endif
1689 FLAG_SET_DEFAULT(ParallelGCThreads,
1690 Abstract_VM_Version::parallel_worker_threads());
1691 if (ParallelGCThreads == 0) {
1692 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1693 }
1694
1695 #if INCLUDE_ALL_GCS
1696 if (G1ConcRefinementThreads == 0) {
1697 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1698 }
1699 #endif
1700
1701 // MarkStackSize will be set (if it hasn't been set by the user)
1702 // when concurrent marking is initialized.
1703 // Its value will be based upon the number of parallel marking threads.
1704 // But we do set the maximum mark stack size here.
1705 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1706 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1707 }
1708
1709 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1710 // In G1, we want the default GC overhead goal to be higher than
1711 // say in PS. So we set it here to 10%. Otherwise the heap might
1712 // be expanded more aggressively than we would like it to. In
1713 // fact, even 10% seems to not be high enough in some cases
1714 // (especially small GC stress tests that the main thing they do
1715 // is allocation). We might consider increase it further.
1716 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1717 }
1718
1719 if (PrintGCDetails && Verbose) {
1720 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1721 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1722 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1723 }
1724 }
1725
1726 #if !INCLUDE_ALL_GCS
1727 #ifdef ASSERT
1728 static bool verify_serial_gc_flags() {
1729 return (UseSerialGC &&
1730 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1731 UseParallelGC || UseParallelOldGC));
1732 }
1733 #endif // ASSERT
1734 #endif // INCLUDE_ALL_GCS
1735
1736 void Arguments::set_gc_specific_flags() {
1737 #if INCLUDE_ALL_GCS
1738 // Set per-collector flags
1739 if (UseParallelGC || UseParallelOldGC) {
1740 set_parallel_gc_flags();
1741 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1742 set_cms_and_parnew_gc_flags();
1743 } else if (UseParNewGC) { // Skipped if CMS is set above
1744 set_parnew_gc_flags();
1745 } else if (UseG1GC) {
1746 set_g1_gc_flags();
1747 }
1748 check_deprecated_gcs();
1749 check_deprecated_gc_flags();
1750 if (AssumeMP && !UseSerialGC) {
1751 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1752 warning("If the number of processors is expected to increase from one, then"
1753 " you should configure the number of parallel GC threads appropriately"
1754 " using -XX:ParallelGCThreads=N");
1755 }
1756 }
1757 if (MinHeapFreeRatio == 100) {
1758 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1759 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1760 }
1761
1762 // If class unloading is disabled, also disable concurrent class unloading.
1763 if (!ClassUnloading) {
1764 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1765 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
1766 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1767 }
1768 #else // INCLUDE_ALL_GCS
1769 assert(verify_serial_gc_flags(), "SerialGC unset");
1770 #endif // INCLUDE_ALL_GCS
1771 }
1772
1773 julong Arguments::limit_by_allocatable_memory(julong limit) {
1774 julong max_allocatable;
1775 julong result = limit;
1776 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1777 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1778 }
1779 return result;
1780 }
1781
1782 void Arguments::set_heap_size() {
1783 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1784 // Deprecated flag
1785 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1786 }
1787
1788 julong phys_mem =
1789 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1790 : (julong)MaxRAM;
1791
1792 // Experimental support for CGroup memory limits
1793 if (UseCGroupMemoryLimitForHeap) {
1794 // This is a rough indicator that a CGroup limit may be in force
1795 // for this process
1796 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1797 FILE *fp = fopen(lim_file, "r");
1798 if (fp != NULL) {
1799 julong cgroup_max = 0;
1800 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
1801 if (ret == 1 && cgroup_max > 0) {
1802 // If unlimited, cgroup_max will be a very large, but unspecified
1803 // value, so use initial phys_mem as a limit
1804 if (PrintGCDetails && Verbose) {
1805 // Cannot use gclog_or_tty yet.
1806 tty->print_cr("Setting phys_mem to the min of cgroup limit ("
1807 JULONG_FORMAT "MB) and initial phys_mem ("
1808 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
1809 }
1810 phys_mem = MIN2(cgroup_max, phys_mem);
1811 } else {
1812 warning("Unable to read/parse cgroup memory limit from %s: %s",
1813 lim_file, errno != 0 ? strerror(errno) : "unknown error");
1814 }
1815 fclose(fp);
1816 } else {
1817 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
1818 }
1819 }
1820
1821 // Convert Fraction to Precentage values
1822 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1823 !FLAG_IS_DEFAULT(MaxRAMFraction))
1824 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1825
1826 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1827 !FLAG_IS_DEFAULT(MinRAMFraction))
1828 MinRAMPercentage = 100.0 / MinRAMFraction;
1829
1830 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1831 !FLAG_IS_DEFAULT(InitialRAMFraction))
1832 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1833
1834 // If the maximum heap size has not been set with -Xmx,
1835 // then set it as fraction of the size of physical memory,
1836 // respecting the maximum and minimum sizes of the heap.
1837 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1838 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1839 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1840 if (reasonable_min < MaxHeapSize) {
1841 // Small physical memory, so use a minimum fraction of it for the heap
1842 reasonable_max = reasonable_min;
1843 } else {
1844 // Not-small physical memory, so require a heap at least
1845 // as large as MaxHeapSize
1846 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1847 }
1848
1849 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1850 // Limit the heap size to ErgoHeapSizeLimit
1851 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1852 }
1853 if (UseCompressedOops) {
1854 // Limit the heap size to the maximum possible when using compressed oops
1855 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1856 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1857 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1858 // but it should be not less than default MaxHeapSize.
1859 max_coop_heap -= HeapBaseMinAddress;
1860 }
1861 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1862 }
1863 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1864
1865 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1866 // An initial heap size was specified on the command line,
1867 // so be sure that the maximum size is consistent. Done
1868 // after call to limit_by_allocatable_memory because that
1869 // method might reduce the allocation size.
1870 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1871 }
1872
1873 if (PrintGCDetails && Verbose) {
1874 // Cannot use gclog_or_tty yet.
1875 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1876 }
1877 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1878 }
1879
1880 // If the minimum or initial heap_size have not been set or requested to be set
1881 // ergonomically, set them accordingly.
1882 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1883 julong reasonable_minimum = (julong)(OldSize + NewSize);
1884
1885 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1886
1887 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1888
1889 if (InitialHeapSize == 0) {
1890 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1891
1892 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1893 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1894
1895 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1896
1897 if (PrintGCDetails && Verbose) {
1898 // Cannot use gclog_or_tty yet.
1899 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1900 }
1901 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1902 }
1903 // If the minimum heap size has not been set (via -Xms),
1904 // synchronize with InitialHeapSize to avoid errors with the default value.
1905 if (min_heap_size() == 0) {
1906 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1907 if (PrintGCDetails && Verbose) {
1908 // Cannot use gclog_or_tty yet.
1909 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1910 }
1911 }
1912 }
1913 }
1914
1915 // This option inspects the machine and attempts to set various
1916 // parameters to be optimal for long-running, memory allocation
1917 // intensive jobs. It is intended for machines with large
1918 // amounts of cpu and memory.
1919 jint Arguments::set_aggressive_heap_flags() {
1920 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1921 // VM, but we may not be able to represent the total physical memory
1922 // available (like having 8gb of memory on a box but using a 32bit VM).
1923 // Thus, we need to make sure we're using a julong for intermediate
1924 // calculations.
1925 julong initHeapSize;
1926 julong total_memory = os::physical_memory();
1927
1928 if (total_memory < (julong) 256 * M) {
1929 jio_fprintf(defaultStream::error_stream(),
1930 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1931 vm_exit(1);
1932 }
1933
1934 // The heap size is half of available memory, or (at most)
1935 // all of possible memory less 160mb (leaving room for the OS
1936 // when using ISM). This is the maximum; because adaptive sizing
1937 // is turned on below, the actual space used may be smaller.
1938
1939 initHeapSize = MIN2(total_memory / (julong) 2,
1940 total_memory - (julong) 160 * M);
1941
1942 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1943
1944 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1945 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
1946 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
1947 // Currently the minimum size and the initial heap sizes are the same.
1948 set_min_heap_size(initHeapSize);
1949 }
1950 if (FLAG_IS_DEFAULT(NewSize)) {
1951 // Make the young generation 3/8ths of the total heap.
1952 FLAG_SET_CMDLINE(uintx, NewSize,
1953 ((julong) MaxHeapSize / (julong) 8) * (julong) 3);
1954 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
1955 }
1956
1957 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
1958 FLAG_SET_DEFAULT(UseLargePages, true);
1959 #endif
1960
1961 // Increase some data structure sizes for efficiency
1962 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
1963 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
1964 FLAG_SET_CMDLINE(uintx, TLABSize, 256 * K);
1965
1966 // See the OldPLABSize comment below, but replace 'after promotion'
1967 // with 'after copying'. YoungPLABSize is the size of the survivor
1968 // space per-gc-thread buffers. The default is 4kw.
1969 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256 * K); // Note: this is in words
1970
1971 // OldPLABSize is the size of the buffers in the old gen that
1972 // UseParallelGC uses to promote live data that doesn't fit in the
1973 // survivor spaces. At any given time, there's one for each gc thread.
1974 // The default size is 1kw. These buffers are rarely used, since the
1975 // survivor spaces are usually big enough. For specjbb, however, there
1976 // are occasions when there's lots of live data in the young gen
1977 // and we end up promoting some of it. We don't have a definite
1978 // explanation for why bumping OldPLABSize helps, but the theory
1979 // is that a bigger PLAB results in retaining something like the
1980 // original allocation order after promotion, which improves mutator
1981 // locality. A minor effect may be that larger PLABs reduce the
1982 // number of PLAB allocation events during gc. The value of 8kw
1983 // was arrived at by experimenting with specjbb.
1984 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8 * K); // Note: this is in words
1985
1986 // Enable parallel GC and adaptive generation sizing
1987 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
1988
1989 // Encourage steady state memory management
1990 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
1991
1992 // This appears to improve mutator locality
1993 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1994
1995 // Get around early Solaris scheduling bug
1996 // (affinity vs other jobs on system)
1997 // but disallow DR and offlining (5008695).
1998 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
1999
2000 return JNI_OK;
2001 }
2002
2003 // This must be called after ergonomics because we want bytecode rewriting
2004 // if the server compiler is used, or if UseSharedSpaces is disabled.
2005 void Arguments::set_bytecode_flags() {
2006 // Better not attempt to store into a read-only space.
2007 if (UseSharedSpaces) {
2008 FLAG_SET_DEFAULT(RewriteBytecodes, false);
2009 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2010 }
2011
2012 if (!RewriteBytecodes) {
2013 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2014 }
2015 }
2016
2017 // Aggressive optimization flags -XX:+AggressiveOpts
2018 void Arguments::set_aggressive_opts_flags() {
2019 #ifdef COMPILER2
2020 if (AggressiveUnboxing) {
2021 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2022 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2023 } else if (!EliminateAutoBox) {
2024 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2025 AggressiveUnboxing = false;
2026 }
2027 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2028 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2029 } else if (!DoEscapeAnalysis) {
2030 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2031 AggressiveUnboxing = false;
2032 }
2033 }
2034 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2035 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2036 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2037 }
2038 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2039 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2040 }
2041
2042 // Feed the cache size setting into the JDK
2043 char buffer[1024];
2044 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2045 add_property(buffer);
2046 }
2047 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2048 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2049 }
2050 #endif
2051
2052 if (AggressiveOpts) {
2053 // Sample flag setting code
2054 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2055 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2056 // }
2057 }
2058 }
2059
2060 //===========================================================================================================
2061 // Parsing of java.compiler property
2062
2063 void Arguments::process_java_compiler_argument(char* arg) {
2064 // For backwards compatibility, Djava.compiler=NONE or ""
2065 // causes us to switch to -Xint mode UNLESS -Xdebug
2066 // is also specified.
2067 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2068 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2069 }
2070 }
2071
2072 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2073 _sun_java_launcher = strdup(launcher);
2074 if (strcmp("gamma", _sun_java_launcher) == 0) {
2075 _created_by_gamma_launcher = true;
2076 }
2077 }
2078
2079 bool Arguments::created_by_java_launcher() {
2080 assert(_sun_java_launcher != NULL, "property must have value");
2081 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2082 }
2083
2084 bool Arguments::created_by_gamma_launcher() {
2085 return _created_by_gamma_launcher;
2086 }
2087
2088 //===========================================================================================================
2089 // Parsing of main arguments
2090
2091 bool Arguments::verify_interval(uintx val, uintx min,
2092 uintx max, const char* name) {
2093 // Returns true iff value is in the inclusive interval [min..max]
2094 // false, otherwise.
2095 if (val >= min && val <= max) {
2096 return true;
2097 }
2098 jio_fprintf(defaultStream::error_stream(),
2099 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
2100 " and " UINTX_FORMAT "\n",
2101 name, val, min, max);
2102 return false;
2103 }
2104
2105 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2106 // Returns true if given value is at least specified min threshold
2107 // false, otherwise.
2108 if (val >= min ) {
2109 return true;
2110 }
2111 jio_fprintf(defaultStream::error_stream(),
2112 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2113 name, val, min);
2114 return false;
2115 }
2116
2117 bool Arguments::verify_percentage(uintx value, const char* name) {
2118 if (is_percentage(value)) {
2119 return true;
2120 }
2121 jio_fprintf(defaultStream::error_stream(),
2122 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2123 name, value);
2124 return false;
2125 }
2126
2127 // check if do gclog rotation
2128 // +UseGCLogFileRotation is a must,
2129 // no gc log rotation when log file not supplied or
2130 // NumberOfGCLogFiles is 0
2131 void check_gclog_consistency() {
2132 if (UseGCLogFileRotation) {
2133 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2134 jio_fprintf(defaultStream::output_stream(),
2135 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2136 "where num_of_file > 0\n"
2137 "GC log rotation is turned off\n");
2138 UseGCLogFileRotation = false;
2139 }
2140 }
2141
2142 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2143 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2144 jio_fprintf(defaultStream::output_stream(),
2145 "GCLogFileSize changed to minimum 8K\n");
2146 }
2147 }
2148
2149 // This function is called for -Xloggc:<filename>, it can be used
2150 // to check if a given file name(or string) conforms to the following
2151 // specification:
2152 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2153 // %p and %t only allowed once. We only limit usage of filename not path
2154 bool is_filename_valid(const char *file_name) {
2155 const char* p = file_name;
2156 char file_sep = os::file_separator()[0];
2157 const char* cp;
2158 // skip prefix path
2159 for (cp = file_name; *cp != '\0'; cp++) {
2160 if (*cp == '/' || *cp == file_sep) {
2161 p = cp + 1;
2162 }
2163 }
2164
2165 int count_p = 0;
2166 int count_t = 0;
2167 while (*p != '\0') {
2168 if ((*p >= '0' && *p <= '9') ||
2169 (*p >= 'A' && *p <= 'Z') ||
2170 (*p >= 'a' && *p <= 'z') ||
2171 *p == '-' ||
2172 *p == '_' ||
2173 *p == '.') {
2174 p++;
2175 continue;
2176 }
2177 if (*p == '%') {
2178 if(*(p + 1) == 'p') {
2179 p += 2;
2180 count_p ++;
2181 continue;
2182 }
2183 if (*(p + 1) == 't') {
2184 p += 2;
2185 count_t ++;
2186 continue;
2187 }
2188 }
2189 return false;
2190 }
2191 return count_p < 2 && count_t < 2;
2192 }
2193
2194 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2195 if (!is_percentage(min_heap_free_ratio)) {
2196 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2197 return false;
2198 }
2199 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2200 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2201 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2202 MaxHeapFreeRatio);
2203 return false;
2204 }
2205 // This does not set the flag itself, but stores the value in a safe place for later usage.
2206 _min_heap_free_ratio = min_heap_free_ratio;
2207 return true;
2208 }
2209
2210 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2211 if (!is_percentage(max_heap_free_ratio)) {
2212 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2213 return false;
2214 }
2215 if (max_heap_free_ratio < MinHeapFreeRatio) {
2216 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2217 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2218 MinHeapFreeRatio);
2219 return false;
2220 }
2221 // This does not set the flag itself, but stores the value in a safe place for later usage.
2222 _max_heap_free_ratio = max_heap_free_ratio;
2223 return true;
2224 }
2225
2226 // Check consistency of GC selection
2227 bool Arguments::check_gc_consistency() {
2228 check_gclog_consistency();
2229 bool status = true;
2230 // Ensure that the user has not selected conflicting sets
2231 // of collectors. [Note: this check is merely a user convenience;
2232 // collectors over-ride each other so that only a non-conflicting
2233 // set is selected; however what the user gets is not what they
2234 // may have expected from the combination they asked for. It's
2235 // better to reduce user confusion by not allowing them to
2236 // select conflicting combinations.
2237 uint i = 0;
2238 if (UseSerialGC) i++;
2239 if (UseConcMarkSweepGC || UseParNewGC) i++;
2240 if (UseParallelGC || UseParallelOldGC) i++;
2241 if (UseG1GC) i++;
2242 if (i > 1) {
2243 jio_fprintf(defaultStream::error_stream(),
2244 "Conflicting collector combinations in option list; "
2245 "please refer to the release notes for the combinations "
2246 "allowed\n");
2247 status = false;
2248 }
2249 return status;
2250 }
2251
2252 void Arguments::check_deprecated_gcs() {
2253 if (UseConcMarkSweepGC && !UseParNewGC) {
2254 warning("Using the DefNew young collector with the CMS collector is deprecated "
2255 "and will likely be removed in a future release");
2256 }
2257
2258 if (UseParNewGC && !UseConcMarkSweepGC) {
2259 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2260 // set up UseSerialGC properly, so that can't be used in the check here.
2261 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2262 "and will likely be removed in a future release");
2263 }
2264
2265 if (CMSIncrementalMode) {
2266 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2267 }
2268 }
2269
2270 void Arguments::check_deprecated_gc_flags() {
2271 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2272 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2273 "and will likely be removed in future release");
2274 }
2275 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2276 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2277 "Use MaxRAMFraction instead.");
2278 }
2279 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2280 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2281 }
2282 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2283 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2284 }
2285 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2286 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2287 }
2288 }
2289
2290 // Check stack pages settings
2291 bool Arguments::check_stack_pages()
2292 {
2293 bool status = true;
2294 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2295 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2296 // greater stack shadow pages can't generate instruction to bang stack
2297 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2298 return status;
2299 }
2300
2301 // Check the consistency of vm_init_args
2302 bool Arguments::check_vm_args_consistency() {
2303 // Method for adding checks for flag consistency.
2304 // The intent is to warn the user of all possible conflicts,
2305 // before returning an error.
2306 // Note: Needs platform-dependent factoring.
2307 bool status = true;
2308
2309 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2310 // builds so the cost of stack banging can be measured.
2311 #if (defined(PRODUCT) && defined(SOLARIS))
2312 if (!UseBoundThreads && !UseStackBanging) {
2313 jio_fprintf(defaultStream::error_stream(),
2314 "-UseStackBanging conflicts with -UseBoundThreads\n");
2315
2316 status = false;
2317 }
2318 #endif
2319
2320 if (TLABRefillWasteFraction == 0) {
2321 jio_fprintf(defaultStream::error_stream(),
2322 "TLABRefillWasteFraction should be a denominator, "
2323 "not " SIZE_FORMAT "\n",
2324 TLABRefillWasteFraction);
2325 status = false;
2326 }
2327
2328 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2329 "AdaptiveSizePolicyWeight");
2330 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2331
2332 // Divide by bucket size to prevent a large size from causing rollover when
2333 // calculating amount of memory needed to be allocated for the String table.
2334 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2335 (max_uintx / StringTable::bucket_size()), "StringTable size");
2336
2337 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2338 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2339
2340 {
2341 // Using "else if" below to avoid printing two error messages if min > max.
2342 // This will also prevent us from reporting both min>100 and max>100 at the
2343 // same time, but that is less annoying than printing two identical errors IMHO.
2344 FormatBuffer<80> err_msg("%s","");
2345 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2346 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2347 status = false;
2348 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2349 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2350 status = false;
2351 }
2352 }
2353
2354 // Min/MaxMetaspaceFreeRatio
2355 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2356 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2357
2358 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2359 jio_fprintf(defaultStream::error_stream(),
2360 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2361 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2362 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2363 MinMetaspaceFreeRatio,
2364 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2365 MaxMetaspaceFreeRatio);
2366 status = false;
2367 }
2368
2369 // Trying to keep 100% free is not practical
2370 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2371
2372 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2373 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2374 }
2375
2376 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2377 // Settings to encourage splitting.
2378 if (!FLAG_IS_CMDLINE(NewRatio)) {
2379 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2380 }
2381 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2382 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2383 }
2384 }
2385
2386 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2387 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2388 if (GCTimeLimit == 100) {
2389 // Turn off gc-overhead-limit-exceeded checks
2390 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2391 }
2392
2393 status = status && check_gc_consistency();
2394 status = status && check_stack_pages();
2395
2396 if (CMSIncrementalMode) {
2397 if (!UseConcMarkSweepGC) {
2398 jio_fprintf(defaultStream::error_stream(),
2399 "error: invalid argument combination.\n"
2400 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2401 "selected in order\nto use CMSIncrementalMode.\n");
2402 status = false;
2403 } else {
2404 status = status && verify_percentage(CMSIncrementalDutyCycle,
2405 "CMSIncrementalDutyCycle");
2406 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2407 "CMSIncrementalDutyCycleMin");
2408 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2409 "CMSIncrementalSafetyFactor");
2410 status = status && verify_percentage(CMSIncrementalOffset,
2411 "CMSIncrementalOffset");
2412 status = status && verify_percentage(CMSExpAvgFactor,
2413 "CMSExpAvgFactor");
2414 // If it was not set on the command line, set
2415 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2416 if (CMSInitiatingOccupancyFraction < 0) {
2417 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2418 }
2419 }
2420 }
2421
2422 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2423 // insists that we hold the requisite locks so that the iteration is
2424 // MT-safe. For the verification at start-up and shut-down, we don't
2425 // yet have a good way of acquiring and releasing these locks,
2426 // which are not visible at the CollectedHeap level. We want to
2427 // be able to acquire these locks and then do the iteration rather
2428 // than just disable the lock verification. This will be fixed under
2429 // bug 4788986.
2430 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2431 if (VerifyDuringStartup) {
2432 warning("Heap verification at start-up disabled "
2433 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2434 VerifyDuringStartup = false; // Disable verification at start-up
2435 }
2436
2437 if (VerifyBeforeExit) {
2438 warning("Heap verification at shutdown disabled "
2439 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2440 VerifyBeforeExit = false; // Disable verification at shutdown
2441 }
2442 }
2443
2444 // Note: only executed in non-PRODUCT mode
2445 if (!UseAsyncConcMarkSweepGC &&
2446 (ExplicitGCInvokesConcurrent ||
2447 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2448 jio_fprintf(defaultStream::error_stream(),
2449 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2450 " with -UseAsyncConcMarkSweepGC");
2451 status = false;
2452 }
2453
2454 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2455
2456 #if INCLUDE_ALL_GCS
2457 if (UseG1GC) {
2458 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2459 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2460 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2461
2462 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2463 "InitiatingHeapOccupancyPercent");
2464 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2465 "G1RefProcDrainInterval");
2466 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2467 "G1ConcMarkStepDurationMillis");
2468 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2469 "G1ConcRSHotCardLimit");
2470 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2471 "G1ConcRSLogCacheSize");
2472 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2473 "StringDeduplicationAgeThreshold");
2474 }
2475 if (UseConcMarkSweepGC) {
2476 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2477 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2478 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2479 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2480
2481 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2482
2483 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2484 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2485 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2486
2487 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2488
2489 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2490 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2491
2492 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2493 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2494 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2495
2496 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2497
2498 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2499
2500 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2501 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2502 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2503 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2504 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2505 }
2506
2507 if (UseParallelGC || UseParallelOldGC) {
2508 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2509 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2510
2511 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2512 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2513
2514 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2515 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2516
2517 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2518
2519 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2520 }
2521 #endif // INCLUDE_ALL_GCS
2522
2523 status = status && verify_interval(RefDiscoveryPolicy,
2524 ReferenceProcessor::DiscoveryPolicyMin,
2525 ReferenceProcessor::DiscoveryPolicyMax,
2526 "RefDiscoveryPolicy");
2527
2528 // Limit the lower bound of this flag to 1 as it is used in a division
2529 // expression.
2530 status = status && verify_interval(TLABWasteTargetPercent,
2531 1, 100, "TLABWasteTargetPercent");
2532
2533 status = status && verify_object_alignment();
2534
2535 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2536 "CompressedClassSpaceSize");
2537
2538 status = status && verify_interval(MarkStackSizeMax,
2539 1, (max_jint - 1), "MarkStackSizeMax");
2540 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2541
2542 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2543
2544 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2545
2546 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2547
2548 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2549 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2550
2551 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2552
2553 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2554 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2555 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2556 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2557
2558 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2559 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2560
2561 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2562 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2563 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2564
2565 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2566 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2567
2568 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2569 // just for that, so hardcode here.
2570 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2571 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2572 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2573 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2574
2575 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2576 #ifdef COMPILER1
2577 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2578 #endif
2579
2580 if (PrintNMTStatistics) {
2581 #if INCLUDE_NMT
2582 if (MemTracker::tracking_level() == NMT_off) {
2583 #endif // INCLUDE_NMT
2584 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2585 PrintNMTStatistics = false;
2586 #if INCLUDE_NMT
2587 }
2588 #endif
2589 }
2590
2591 // Need to limit the extent of the padding to reasonable size.
2592 // 8K is well beyond the reasonable HW cache line size, even with the
2593 // aggressive prefetching, while still leaving the room for segregating
2594 // among the distinct pages.
2595 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2596 jio_fprintf(defaultStream::error_stream(),
2597 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2598 ContendedPaddingWidth, 0, 8192);
2599 status = false;
2600 }
2601
2602 // Need to enforce the padding not to break the existing field alignments.
2603 // It is sufficient to check against the largest type size.
2604 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2605 jio_fprintf(defaultStream::error_stream(),
2606 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2607 ContendedPaddingWidth, BytesPerLong);
2608 status = false;
2609 }
2610
2611 // Check lower bounds of the code cache
2612 // Template Interpreter code is approximately 3X larger in debug builds.
2613 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2614 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2615 jio_fprintf(defaultStream::error_stream(),
2616 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2617 os::vm_page_size()/K);
2618 status = false;
2619 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2620 jio_fprintf(defaultStream::error_stream(),
2621 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2622 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2623 status = false;
2624 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2625 jio_fprintf(defaultStream::error_stream(),
2626 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2627 min_code_cache_size/K);
2628 status = false;
2629 } else if (ReservedCodeCacheSize > 2*G) {
2630 // Code cache size larger than MAXINT is not supported.
2631 jio_fprintf(defaultStream::error_stream(),
2632 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2633 (2*G)/M);
2634 status = false;
2635 }
2636
2637 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2638 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2639
2640 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2641 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2642 }
2643
2644 #ifdef COMPILER1
2645 status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
2646 #endif
2647
2648 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2649 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2650 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2651 // Check the minimum number of compiler threads
2652 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2653
2654 return status;
2655 }
2656
2657 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2658 const char* option_type) {
2659 if (ignore) return false;
2660
2661 const char* spacer = " ";
2662 if (option_type == NULL) {
2663 option_type = ++spacer; // Set both to the empty string.
2664 }
2665
2666 if (os::obsolete_option(option)) {
2667 jio_fprintf(defaultStream::error_stream(),
2668 "Obsolete %s%soption: %s\n", option_type, spacer,
2669 option->optionString);
2670 return false;
2671 } else {
2672 jio_fprintf(defaultStream::error_stream(),
2673 "Unrecognized %s%soption: %s\n", option_type, spacer,
2674 option->optionString);
2675 return true;
2676 }
2677 }
2678
2679 static const char* user_assertion_options[] = {
2680 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2681 };
2682
2683 static const char* system_assertion_options[] = {
2684 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2685 };
2686
2687 // Return true if any of the strings in null-terminated array 'names' matches.
2688 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2689 // the option must match exactly.
2690 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2691 bool tail_allowed) {
2692 for (/* empty */; *names != NULL; ++names) {
2693 if (match_option(option, *names, tail)) {
2694 if (**tail == '\0' || tail_allowed && **tail == ':') {
2695 return true;
2696 }
2697 }
2698 }
2699 return false;
2700 }
2701
2702 bool Arguments::parse_uintx(const char* value,
2703 uintx* uintx_arg,
2704 uintx min_size) {
2705
2706 // Check the sign first since atomull() parses only unsigned values.
2707 bool value_is_positive = !(*value == '-');
2708
2709 if (value_is_positive) {
2710 julong n;
2711 bool good_return = atomull(value, &n);
2712 if (good_return) {
2713 bool above_minimum = n >= min_size;
2714 bool value_is_too_large = n > max_uintx;
2715
2716 if (above_minimum && !value_is_too_large) {
2717 *uintx_arg = n;
2718 return true;
2719 }
2720 }
2721 }
2722 return false;
2723 }
2724
2725 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2726 julong* long_arg,
2727 julong min_size) {
2728 if (!atomull(s, long_arg)) return arg_unreadable;
2729 return check_memory_size(*long_arg, min_size);
2730 }
2731
2732 // Parse JavaVMInitArgs structure
2733
2734 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2735 // For components of the system classpath.
2736 SysClassPath scp(Arguments::get_sysclasspath());
2737 bool scp_assembly_required = false;
2738
2739 // Save default settings for some mode flags
2740 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2741 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2742 Arguments::_ClipInlining = ClipInlining;
2743 Arguments::_BackgroundCompilation = BackgroundCompilation;
2744
2745 // Setup flags for mixed which is the default
2746 set_mode_flags(_mixed);
2747
2748 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2749 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2750 if (result != JNI_OK) {
2751 return result;
2752 }
2753
2754 // Parse JavaVMInitArgs structure passed in
2755 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2756 if (result != JNI_OK) {
2757 return result;
2758 }
2759
2760 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2761 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2762 if (result != JNI_OK) {
2763 return result;
2764 }
2765
2766 // We need to ensure processor and memory resources have been properly
2767 // configured - which may rely on arguments we just processed - before
2768 // doing the final argument processing. Any argument processing that
2769 // needs to know about processor and memory resources must occur after
2770 // this point.
2771
2772 os::init_container_support();
2773
2774 // Do final processing now that all arguments have been parsed
2775 result = finalize_vm_init_args(&scp, scp_assembly_required);
2776 if (result != JNI_OK) {
2777 return result;
2778 }
2779
2780 return JNI_OK;
2781 }
2782
2783 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2784 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2785 // are dealing with -agentpath (case where name is a path), otherwise with
2786 // -agentlib
2787 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2788 char *_name;
2789 const char *_hprof = "hprof", *_jdwp = "jdwp";
2790 size_t _len_hprof, _len_jdwp, _len_prefix;
2791
2792 if (is_path) {
2793 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2794 return false;
2795 }
2796
2797 _name++; // skip past last path separator
2798 _len_prefix = strlen(JNI_LIB_PREFIX);
2799
2800 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2801 return false;
2802 }
2803
2804 _name += _len_prefix;
2805 _len_hprof = strlen(_hprof);
2806 _len_jdwp = strlen(_jdwp);
2807
2808 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2809 _name += _len_hprof;
2810 }
2811 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2812 _name += _len_jdwp;
2813 }
2814 else {
2815 return false;
2816 }
2817
2818 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2819 return false;
2820 }
2821
2822 return true;
2823 }
2824
2825 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2826 return true;
2827 }
2828
2829 return false;
2830 }
2831
2832 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2833 SysClassPath* scp_p,
2834 bool* scp_assembly_required_p,
2835 Flag::Flags origin) {
2836 // Remaining part of option string
2837 const char* tail;
2838
2839 // iterate over arguments
2840 for (int index = 0; index < args->nOptions; index++) {
2841 bool is_absolute_path = false; // for -agentpath vs -agentlib
2842
2843 const JavaVMOption* option = args->options + index;
2844
2845 if (!match_option(option, "-Djava.class.path", &tail) &&
2846 !match_option(option, "-Dsun.java.command", &tail) &&
2847 !match_option(option, "-Dsun.java.launcher", &tail)) {
2848
2849 // add all jvm options to the jvm_args string. This string
2850 // is used later to set the java.vm.args PerfData string constant.
2851 // the -Djava.class.path and the -Dsun.java.command options are
2852 // omitted from jvm_args string as each have their own PerfData
2853 // string constant object.
2854 build_jvm_args(option->optionString);
2855 }
2856
2857 // -verbose:[class/gc/jni]
2858 if (match_option(option, "-verbose", &tail)) {
2859 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2860 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2861 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2862 } else if (!strcmp(tail, ":gc")) {
2863 FLAG_SET_CMDLINE(bool, PrintGC, true);
2864 } else if (!strcmp(tail, ":jni")) {
2865 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2866 }
2867 // -da / -ea / -disableassertions / -enableassertions
2868 // These accept an optional class/package name separated by a colon, e.g.,
2869 // -da:java.lang.Thread.
2870 } else if (match_option(option, user_assertion_options, &tail, true)) {
2871 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2872 if (*tail == '\0') {
2873 JavaAssertions::setUserClassDefault(enable);
2874 } else {
2875 assert(*tail == ':', "bogus match by match_option()");
2876 JavaAssertions::addOption(tail + 1, enable);
2877 }
2878 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2879 } else if (match_option(option, system_assertion_options, &tail, false)) {
2880 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2881 JavaAssertions::setSystemClassDefault(enable);
2882 // -bootclasspath:
2883 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2884 scp_p->reset_path(tail);
2885 *scp_assembly_required_p = true;
2886 // -bootclasspath/a:
2887 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2888 scp_p->add_suffix(tail);
2889 *scp_assembly_required_p = true;
2890 // -bootclasspath/p:
2891 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2892 scp_p->add_prefix(tail);
2893 *scp_assembly_required_p = true;
2894 // -Xrun
2895 } else if (match_option(option, "-Xrun", &tail)) {
2896 if (tail != NULL) {
2897 const char* pos = strchr(tail, ':');
2898 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2899 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2900 name[len] = '\0';
2901
2902 char *options = NULL;
2903 if(pos != NULL) {
2904 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2905 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2906 }
2907 #if !INCLUDE_JVMTI
2908 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2909 jio_fprintf(defaultStream::error_stream(),
2910 "Profiling and debugging agents are not supported in this VM\n");
2911 return JNI_ERR;
2912 }
2913 #endif // !INCLUDE_JVMTI
2914 add_init_library(name, options);
2915 }
2916 // -agentlib and -agentpath
2917 } else if (match_option(option, "-agentlib:", &tail) ||
2918 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2919 if(tail != NULL) {
2920 const char* pos = strchr(tail, '=');
2921 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2922 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2923 name[len] = '\0';
2924
2925 char *options = NULL;
2926 if(pos != NULL) {
2927 size_t length = strlen(pos + 1) + 1;
2928 options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2929 jio_snprintf(options, length, "%s", pos + 1);
2930 }
2931 #if !INCLUDE_JVMTI
2932 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2933 jio_fprintf(defaultStream::error_stream(),
2934 "Profiling and debugging agents are not supported in this VM\n");
2935 return JNI_ERR;
2936 }
2937 #endif // !INCLUDE_JVMTI
2938 add_init_agent(name, options, is_absolute_path);
2939 }
2940 // -javaagent
2941 } else if (match_option(option, "-javaagent:", &tail)) {
2942 #if !INCLUDE_JVMTI
2943 jio_fprintf(defaultStream::error_stream(),
2944 "Instrumentation agents are not supported in this VM\n");
2945 return JNI_ERR;
2946 #else
2947 if(tail != NULL) {
2948 size_t length = strlen(tail) + 1;
2949 char *options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2950 jio_snprintf(options, length, "%s", tail);
2951 add_init_agent("instrument", options, false);
2952 }
2953 #endif // !INCLUDE_JVMTI
2954 // -Xnoclassgc
2955 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2956 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2957 // -Xincgc: i-CMS
2958 } else if (match_option(option, "-Xincgc", &tail)) {
2959 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2960 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2961 // -Xnoincgc: no i-CMS
2962 } else if (match_option(option, "-Xnoincgc", &tail)) {
2963 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2964 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2965 // -Xconcgc
2966 } else if (match_option(option, "-Xconcgc", &tail)) {
2967 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2968 // -Xnoconcgc
2969 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2970 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2971 // -Xbatch
2972 } else if (match_option(option, "-Xbatch", &tail)) {
2973 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2974 // -Xmn for compatibility with other JVM vendors
2975 } else if (match_option(option, "-Xmn", &tail)) {
2976 julong long_initial_young_size = 0;
2977 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2978 if (errcode != arg_in_range) {
2979 jio_fprintf(defaultStream::error_stream(),
2980 "Invalid initial young generation size: %s\n", option->optionString);
2981 describe_range_error(errcode);
2982 return JNI_EINVAL;
2983 }
2984 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2985 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2986 // -Xms
2987 } else if (match_option(option, "-Xms", &tail)) {
2988 julong long_initial_heap_size = 0;
2989 // an initial heap size of 0 means automatically determine
2990 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2991 if (errcode != arg_in_range) {
2992 jio_fprintf(defaultStream::error_stream(),
2993 "Invalid initial heap size: %s\n", option->optionString);
2994 describe_range_error(errcode);
2995 return JNI_EINVAL;
2996 }
2997 set_min_heap_size((uintx)long_initial_heap_size);
2998 // Currently the minimum size and the initial heap sizes are the same.
2999 // Can be overridden with -XX:InitialHeapSize.
3000 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
3001 // -Xmx
3002 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
3003 julong long_max_heap_size = 0;
3004 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
3005 if (errcode != arg_in_range) {
3006 jio_fprintf(defaultStream::error_stream(),
3007 "Invalid maximum heap size: %s\n", option->optionString);
3008 describe_range_error(errcode);
3009 return JNI_EINVAL;
3010 }
3011 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
3012 // Xmaxf
3013 } else if (match_option(option, "-Xmaxf", &tail)) {
3014 char* err;
3015 int maxf = (int)(strtod(tail, &err) * 100);
3016 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
3017 jio_fprintf(defaultStream::error_stream(),
3018 "Bad max heap free percentage size: %s\n",
3019 option->optionString);
3020 return JNI_EINVAL;
3021 } else {
3022 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
3023 }
3024 // Xminf
3025 } else if (match_option(option, "-Xminf", &tail)) {
3026 char* err;
3027 int minf = (int)(strtod(tail, &err) * 100);
3028 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
3029 jio_fprintf(defaultStream::error_stream(),
3030 "Bad min heap free percentage size: %s\n",
3031 option->optionString);
3032 return JNI_EINVAL;
3033 } else {
3034 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
3035 }
3036 // -Xss
3037 } else if (match_option(option, "-Xss", &tail)) {
3038 julong long_ThreadStackSize = 0;
3039 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
3040 if (errcode != arg_in_range) {
3041 jio_fprintf(defaultStream::error_stream(),
3042 "Invalid thread stack size: %s\n", option->optionString);
3043 describe_range_error(errcode);
3044 return JNI_EINVAL;
3045 }
3046 // Internally track ThreadStackSize in units of 1024 bytes.
3047 FLAG_SET_CMDLINE(intx, ThreadStackSize,
3048 round_to((int)long_ThreadStackSize, K) / K);
3049 // -Xoss
3050 } else if (match_option(option, "-Xoss", &tail)) {
3051 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
3052 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3053 julong long_CodeCacheExpansionSize = 0;
3054 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3055 if (errcode != arg_in_range) {
3056 jio_fprintf(defaultStream::error_stream(),
3057 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3058 os::vm_page_size()/K);
3059 return JNI_EINVAL;
3060 }
3061 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
3062 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3063 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3064 julong long_ReservedCodeCacheSize = 0;
3065
3066 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3067 if (errcode != arg_in_range) {
3068 jio_fprintf(defaultStream::error_stream(),
3069 "Invalid maximum code cache size: %s.\n", option->optionString);
3070 return JNI_EINVAL;
3071 }
3072 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
3073 //-XX:IncreaseFirstTierCompileThresholdAt=
3074 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
3075 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
3076 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
3077 jio_fprintf(defaultStream::error_stream(),
3078 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
3079 option->optionString);
3080 return JNI_EINVAL;
3081 }
3082 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
3083 // -green
3084 } else if (match_option(option, "-green", &tail)) {
3085 jio_fprintf(defaultStream::error_stream(),
3086 "Green threads support not available\n");
3087 return JNI_EINVAL;
3088 // -native
3089 } else if (match_option(option, "-native", &tail)) {
3090 // HotSpot always uses native threads, ignore silently for compatibility
3091 // -Xsqnopause
3092 } else if (match_option(option, "-Xsqnopause", &tail)) {
3093 // EVM option, ignore silently for compatibility
3094 // -Xrs
3095 } else if (match_option(option, "-Xrs", &tail)) {
3096 // Classic/EVM option, new functionality
3097 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3098 } else if (match_option(option, "-Xusealtsigs", &tail)) {
3099 // change default internal VM signals used - lower case for back compat
3100 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3101 // -Xoptimize
3102 } else if (match_option(option, "-Xoptimize", &tail)) {
3103 // EVM option, ignore silently for compatibility
3104 // -Xprof
3105 } else if (match_option(option, "-Xprof", &tail)) {
3106 #if INCLUDE_FPROF
3107 _has_profile = true;
3108 #else // INCLUDE_FPROF
3109 jio_fprintf(defaultStream::error_stream(),
3110 "Flat profiling is not supported in this VM.\n");
3111 return JNI_ERR;
3112 #endif // INCLUDE_FPROF
3113 // -Xconcurrentio
3114 } else if (match_option(option, "-Xconcurrentio", &tail)) {
3115 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3116 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3117 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3118 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3119 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
3120
3121 // -Xinternalversion
3122 } else if (match_option(option, "-Xinternalversion", &tail)) {
3123 jio_fprintf(defaultStream::output_stream(), "%s\n",
3124 VM_Version::internal_vm_info_string());
3125 vm_exit(0);
3126 #ifndef PRODUCT
3127 // -Xprintflags
3128 } else if (match_option(option, "-Xprintflags", &tail)) {
3129 CommandLineFlags::printFlags(tty, false);
3130 vm_exit(0);
3131 #endif
3132 // -D
3133 } else if (match_option(option, "-D", &tail)) {
3134 if (CheckEndorsedAndExtDirs) {
3135 if (match_option(option, "-Djava.endorsed.dirs=", &tail)) {
3136 // abort if -Djava.endorsed.dirs is set
3137 jio_fprintf(defaultStream::output_stream(),
3138 "-Djava.endorsed.dirs will not be supported in a future release.\n"
3139 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3140 return JNI_EINVAL;
3141 }
3142 if (match_option(option, "-Djava.ext.dirs=", &tail)) {
3143 // abort if -Djava.ext.dirs is set
3144 jio_fprintf(defaultStream::output_stream(),
3145 "-Djava.ext.dirs will not be supported in a future release.\n"
3146 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3147 return JNI_EINVAL;
3148 }
3149 }
3150
3151 if (!add_property(tail)) {
3152 return JNI_ENOMEM;
3153 }
3154 // Out of the box management support
3155 if (match_option(option, "-Dcom.sun.management", &tail)) {
3156 #if INCLUDE_MANAGEMENT
3157 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3158 #else
3159 jio_fprintf(defaultStream::output_stream(),
3160 "-Dcom.sun.management is not supported in this VM.\n");
3161 return JNI_ERR;
3162 #endif
3163 }
3164 // -Xint
3165 } else if (match_option(option, "-Xint", &tail)) {
3166 set_mode_flags(_int);
3167 // -Xmixed
3168 } else if (match_option(option, "-Xmixed", &tail)) {
3169 set_mode_flags(_mixed);
3170 // -Xcomp
3171 } else if (match_option(option, "-Xcomp", &tail)) {
3172 // for testing the compiler; turn off all flags that inhibit compilation
3173 set_mode_flags(_comp);
3174 // -Xshare:dump
3175 } else if (match_option(option, "-Xshare:dump", &tail)) {
3176 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3177 set_mode_flags(_int); // Prevent compilation, which creates objects
3178 // -Xshare:on
3179 } else if (match_option(option, "-Xshare:on", &tail)) {
3180 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3181 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3182 // -Xshare:auto
3183 } else if (match_option(option, "-Xshare:auto", &tail)) {
3184 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3185 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3186 // -Xshare:off
3187 } else if (match_option(option, "-Xshare:off", &tail)) {
3188 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3189 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3190 // -Xverify
3191 } else if (match_option(option, "-Xverify", &tail)) {
3192 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3193 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3194 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3195 } else if (strcmp(tail, ":remote") == 0) {
3196 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3197 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3198 } else if (strcmp(tail, ":none") == 0) {
3199 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3200 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3201 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3202 return JNI_EINVAL;
3203 }
3204 // -Xdebug
3205 } else if (match_option(option, "-Xdebug", &tail)) {
3206 // note this flag has been used, then ignore
3207 set_xdebug_mode(true);
3208 // -Xnoagent
3209 } else if (match_option(option, "-Xnoagent", &tail)) {
3210 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3211 } else if (match_option(option, "-Xboundthreads", &tail)) {
3212 // Bind user level threads to kernel threads (Solaris only)
3213 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3214 } else if (match_option(option, "-Xloggc:", &tail)) {
3215 // Redirect GC output to the file. -Xloggc:<filename>
3216 // ostream_init_log(), when called will use this filename
3217 // to initialize a fileStream.
3218 _gc_log_filename = strdup(tail);
3219 if (!is_filename_valid(_gc_log_filename)) {
3220 jio_fprintf(defaultStream::output_stream(),
3221 "Invalid file name for use with -Xloggc: Filename can only contain the "
3222 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3223 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3224 return JNI_EINVAL;
3225 }
3226 FLAG_SET_CMDLINE(bool, PrintGC, true);
3227 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3228
3229 // JNI hooks
3230 } else if (match_option(option, "-Xcheck", &tail)) {
3231 if (!strcmp(tail, ":jni")) {
3232 #if !INCLUDE_JNI_CHECK
3233 warning("JNI CHECKING is not supported in this VM");
3234 #else
3235 CheckJNICalls = true;
3236 #endif // INCLUDE_JNI_CHECK
3237 } else if (is_bad_option(option, args->ignoreUnrecognized,
3238 "check")) {
3239 return JNI_EINVAL;
3240 }
3241 } else if (match_option(option, "vfprintf", &tail)) {
3242 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3243 } else if (match_option(option, "exit", &tail)) {
3244 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3245 } else if (match_option(option, "abort", &tail)) {
3246 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3247 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3248 // The last option must always win.
3249 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3250 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3251 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3252 // The last option must always win.
3253 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3254 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3255 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3256 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3257 jio_fprintf(defaultStream::error_stream(),
3258 "Please use CMSClassUnloadingEnabled in place of "
3259 "CMSPermGenSweepingEnabled in the future\n");
3260 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3261 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3262 jio_fprintf(defaultStream::error_stream(),
3263 "Please use -XX:+UseGCOverheadLimit in place of "
3264 "-XX:+UseGCTimeLimit in the future\n");
3265 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3266 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3267 jio_fprintf(defaultStream::error_stream(),
3268 "Please use -XX:-UseGCOverheadLimit in place of "
3269 "-XX:-UseGCTimeLimit in the future\n");
3270 // The TLE options are for compatibility with 1.3 and will be
3271 // removed without notice in a future release. These options
3272 // are not to be documented.
3273 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3274 // No longer used.
3275 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3276 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3277 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3278 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3279 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3280 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3281 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3282 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3283 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3284 // No longer used.
3285 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3286 julong long_tlab_size = 0;
3287 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3288 if (errcode != arg_in_range) {
3289 jio_fprintf(defaultStream::error_stream(),
3290 "Invalid TLAB size: %s\n", option->optionString);
3291 describe_range_error(errcode);
3292 return JNI_EINVAL;
3293 }
3294 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3295 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3296 // No longer used.
3297 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3298 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3299 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3300 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3301 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3302 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3303 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3304 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3305 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3306 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3307 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3308 #if defined(DTRACE_ENABLED)
3309 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3310 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3311 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3312 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3313 #else // defined(DTRACE_ENABLED)
3314 jio_fprintf(defaultStream::error_stream(),
3315 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3316 return JNI_EINVAL;
3317 #endif // defined(DTRACE_ENABLED)
3318 #ifdef ASSERT
3319 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3320 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3321 // disable scavenge before parallel mark-compact
3322 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3323 #endif
3324 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3325 julong cms_blocks_to_claim = (julong)atol(tail);
3326 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3327 jio_fprintf(defaultStream::error_stream(),
3328 "Please use -XX:OldPLABSize in place of "
3329 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3330 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3331 julong cms_blocks_to_claim = (julong)atol(tail);
3332 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3333 jio_fprintf(defaultStream::error_stream(),
3334 "Please use -XX:OldPLABSize in place of "
3335 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3336 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3337 julong old_plab_size = 0;
3338 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3339 if (errcode != arg_in_range) {
3340 jio_fprintf(defaultStream::error_stream(),
3341 "Invalid old PLAB size: %s\n", option->optionString);
3342 describe_range_error(errcode);
3343 return JNI_EINVAL;
3344 }
3345 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3346 jio_fprintf(defaultStream::error_stream(),
3347 "Please use -XX:OldPLABSize in place of "
3348 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3349 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3350 julong young_plab_size = 0;
3351 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3352 if (errcode != arg_in_range) {
3353 jio_fprintf(defaultStream::error_stream(),
3354 "Invalid young PLAB size: %s\n", option->optionString);
3355 describe_range_error(errcode);
3356 return JNI_EINVAL;
3357 }
3358 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3359 jio_fprintf(defaultStream::error_stream(),
3360 "Please use -XX:YoungPLABSize in place of "
3361 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3362 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3363 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3364 julong stack_size = 0;
3365 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3366 if (errcode != arg_in_range) {
3367 jio_fprintf(defaultStream::error_stream(),
3368 "Invalid mark stack size: %s\n", option->optionString);
3369 describe_range_error(errcode);
3370 return JNI_EINVAL;
3371 }
3372 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3373 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3374 julong max_stack_size = 0;
3375 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3376 if (errcode != arg_in_range) {
3377 jio_fprintf(defaultStream::error_stream(),
3378 "Invalid maximum mark stack size: %s\n",
3379 option->optionString);
3380 describe_range_error(errcode);
3381 return JNI_EINVAL;
3382 }
3383 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3384 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3385 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3386 uintx conc_threads = 0;
3387 if (!parse_uintx(tail, &conc_threads, 1)) {
3388 jio_fprintf(defaultStream::error_stream(),
3389 "Invalid concurrent threads: %s\n", option->optionString);
3390 return JNI_EINVAL;
3391 }
3392 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3393 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3394 julong max_direct_memory_size = 0;
3395 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3396 if (errcode != arg_in_range) {
3397 jio_fprintf(defaultStream::error_stream(),
3398 "Invalid maximum direct memory size: %s\n",
3399 option->optionString);
3400 describe_range_error(errcode);
3401 return JNI_EINVAL;
3402 }
3403 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3404 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3405 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3406 // away and will cause VM initialization failures!
3407 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3408 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3409 #if !INCLUDE_MANAGEMENT
3410 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3411 jio_fprintf(defaultStream::error_stream(),
3412 "ManagementServer is not supported in this VM.\n");
3413 return JNI_ERR;
3414 #endif // INCLUDE_MANAGEMENT
3415 #if INCLUDE_JFR
3416 } else if (match_jfr_option(&option)) {
3417 return JNI_EINVAL;
3418 #endif
3419 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3420 // Skip -XX:Flags= since that case has already been handled
3421 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3422 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3423 return JNI_EINVAL;
3424 }
3425 }
3426 // Unknown option
3427 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3428 return JNI_ERR;
3429 }
3430 }
3431
3432 // PrintSharedArchiveAndExit will turn on
3433 // -Xshare:on
3434 // -XX:+TraceClassPaths
3435 if (PrintSharedArchiveAndExit) {
3436 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3437 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3438 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3439 }
3440
3441 // Change the default value for flags which have different default values
3442 // when working with older JDKs.
3443 #ifdef LINUX
3444 if (JDK_Version::current().compare_major(6) <= 0 &&
3445 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3446 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3447 }
3448 #endif // LINUX
3449 fix_appclasspath();
3450 return JNI_OK;
3451 }
3452
3453 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3454 //
3455 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3456 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3457 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3458 // path is treated as the current directory.
3459 //
3460 // This causes problems with CDS, which requires that all directories specified in the classpath
3461 // must be empty. In most cases, applications do NOT want to load classes from the current
3462 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3463 // scripts compatible with CDS.
3464 void Arguments::fix_appclasspath() {
3465 if (IgnoreEmptyClassPaths) {
3466 const char separator = *os::path_separator();
3467 const char* src = _java_class_path->value();
3468
3469 // skip over all the leading empty paths
3470 while (*src == separator) {
3471 src ++;
3472 }
3473
3474 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3475 strncpy(copy, src, strlen(src) + 1);
3476
3477 // trim all trailing empty paths
3478 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3479 *tail = '\0';
3480 }
3481
3482 char from[3] = {separator, separator, '\0'};
3483 char to [2] = {separator, '\0'};
3484 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3485 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3486 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3487 }
3488
3489 _java_class_path->set_value(copy);
3490 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3491 }
3492
3493 if (!PrintSharedArchiveAndExit) {
3494 ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
3495 }
3496 }
3497
3498 static bool has_jar_files(const char* directory) {
3499 DIR* dir = os::opendir(directory);
3500 if (dir == NULL) return false;
3501
3502 struct dirent *entry;
3503 bool hasJarFile = false;
3504 while (!hasJarFile && (entry = os::readdir(dir)) != NULL) {
3505 const char* name = entry->d_name;
3506 const char* ext = name + strlen(name) - 4;
3507 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3508 }
3509 os::closedir(dir);
3510 return hasJarFile ;
3511 }
3512
3513 // returns the number of directories in the given path containing JAR files
3514 // If the skip argument is not NULL, it will skip that directory
3515 static int check_non_empty_dirs(const char* path, const char* type, const char* skip) {
3516 const char separator = *os::path_separator();
3517 const char* const end = path + strlen(path);
3518 int nonEmptyDirs = 0;
3519 while (path < end) {
3520 const char* tmp_end = strchr(path, separator);
3521 if (tmp_end == NULL) {
3522 if ((skip == NULL || strcmp(path, skip) != 0) && has_jar_files(path)) {
3523 nonEmptyDirs++;
3524 jio_fprintf(defaultStream::output_stream(),
3525 "Non-empty %s directory: %s\n", type, path);
3526 }
3527 path = end;
3528 } else {
3529 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3530 memcpy(dirpath, path, tmp_end - path);
3531 dirpath[tmp_end - path] = '\0';
3532 if ((skip == NULL || strcmp(dirpath, skip) != 0) && has_jar_files(dirpath)) {
3533 nonEmptyDirs++;
3534 jio_fprintf(defaultStream::output_stream(),
3535 "Non-empty %s directory: %s\n", type, dirpath);
3536 }
3537 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
3538 path = tmp_end + 1;
3539 }
3540 }
3541 return nonEmptyDirs;
3542 }
3543
3544 // Returns true if endorsed standards override mechanism and extension mechanism
3545 // are not used.
3546 static bool check_endorsed_and_ext_dirs() {
3547 if (!CheckEndorsedAndExtDirs)
3548 return true;
3549
3550 char endorsedDir[JVM_MAXPATHLEN];
3551 char extDir[JVM_MAXPATHLEN];
3552 const char* fileSep = os::file_separator();
3553 jio_snprintf(endorsedDir, sizeof(endorsedDir), "%s%slib%sendorsed",
3554 Arguments::get_java_home(), fileSep, fileSep);
3555 jio_snprintf(extDir, sizeof(extDir), "%s%slib%sext",
3556 Arguments::get_java_home(), fileSep, fileSep);
3557
3558 // check endorsed directory
3559 int nonEmptyDirs = check_non_empty_dirs(Arguments::get_endorsed_dir(), "endorsed", NULL);
3560
3561 // check the extension directories but skip the default lib/ext directory
3562 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs(), "extension", extDir);
3563
3564 // List of JAR files installed in the default lib/ext directory.
3565 // -XX:+CheckEndorsedAndExtDirs checks if any non-JDK file installed
3566 static const char* jdk_ext_jars[] = {
3567 "access-bridge-32.jar",
3568 "access-bridge-64.jar",
3569 "access-bridge.jar",
3570 "cldrdata.jar",
3571 "dnsns.jar",
3572 "jaccess.jar",
3573 "jfxrt.jar",
3574 "localedata.jar",
3575 "nashorn.jar",
3576 "sunec.jar",
3577 "sunjce_provider.jar",
3578 "sunmscapi.jar",
3579 "sunpkcs11.jar",
3580 "ucrypto.jar",
3581 "zipfs.jar",
3582 NULL
3583 };
3584
3585 // check if the default lib/ext directory has any non-JDK jar files; if so, error
3586 DIR* dir = os::opendir(extDir);
3587 if (dir != NULL) {
3588 int num_ext_jars = 0;
3589 struct dirent *entry;
3590 while ((entry = os::readdir(dir)) != NULL) {
3591 const char* name = entry->d_name;
3592 const char* ext = name + strlen(name) - 4;
3593 if (ext > name && (os::file_name_strcmp(ext, ".jar") == 0)) {
3594 bool is_jdk_jar = false;
3595 const char* jarfile = NULL;
3596 for (int i=0; (jarfile = jdk_ext_jars[i]) != NULL; i++) {
3597 if (os::file_name_strcmp(name, jarfile) == 0) {
3598 is_jdk_jar = true;
3599 break;
3600 }
3601 }
3602 if (!is_jdk_jar) {
3603 jio_fprintf(defaultStream::output_stream(),
3604 "%s installed in <JAVA_HOME>/lib/ext\n", name);
3605 num_ext_jars++;
3606 }
3607 }
3608 }
3609 os::closedir(dir);
3610 if (num_ext_jars > 0) {
3611 nonEmptyDirs += 1;
3612 }
3613 }
3614
3615 // check if the default lib/endorsed directory exists; if so, error
3616 dir = os::opendir(endorsedDir);
3617 if (dir != NULL) {
3618 jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed exists\n");
3619 os::closedir(dir);
3620 nonEmptyDirs += 1;
3621 }
3622
3623 if (nonEmptyDirs > 0) {
3624 jio_fprintf(defaultStream::output_stream(),
3625 "Endorsed standards override mechanism and extension mechanism "
3626 "will not be supported in a future release.\n"
3627 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3628 return false;
3629 }
3630
3631 return true;
3632 }
3633
3634 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3635 // This must be done after all -D arguments have been processed.
3636 scp_p->expand_endorsed();
3637
3638 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3639 // Assemble the bootclasspath elements into the final path.
3640 Arguments::set_sysclasspath(scp_p->combined_path());
3641 }
3642
3643 if (!check_endorsed_and_ext_dirs()) {
3644 return JNI_ERR;
3645 }
3646
3647 // This must be done after all arguments have been processed
3648 // and the container support has been initialized since AggressiveHeap
3649 // relies on the amount of total memory available.
3650 if (AggressiveHeap) {
3651 jint result = set_aggressive_heap_flags();
3652 if (result != JNI_OK) {
3653 return result;
3654 }
3655 }
3656 // This must be done after all arguments have been processed.
3657 // java_compiler() true means set to "NONE" or empty.
3658 if (java_compiler() && !xdebug_mode()) {
3659 // For backwards compatibility, we switch to interpreted mode if
3660 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3661 // not specified.
3662 set_mode_flags(_int);
3663 }
3664 if (CompileThreshold == 0) {
3665 set_mode_flags(_int);
3666 }
3667
3668 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3669 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3670 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3671 }
3672
3673 #ifndef COMPILER2
3674 // Don't degrade server performance for footprint
3675 if (FLAG_IS_DEFAULT(UseLargePages) &&
3676 MaxHeapSize < LargePageHeapSizeThreshold) {
3677 // No need for large granularity pages w/small heaps.
3678 // Note that large pages are enabled/disabled for both the
3679 // Java heap and the code cache.
3680 FLAG_SET_DEFAULT(UseLargePages, false);
3681 }
3682
3683 #else
3684 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3685 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3686 }
3687 #endif
3688
3689 #ifndef TIERED
3690 // Tiered compilation is undefined.
3691 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3692 #endif
3693
3694 // If we are running in a headless jre, force java.awt.headless property
3695 // to be true unless the property has already been set.
3696 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3697 if (os::is_headless_jre()) {
3698 const char* headless = Arguments::get_property("java.awt.headless");
3699 if (headless == NULL) {
3700 char envbuffer[128];
3701 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3702 if (!add_property("java.awt.headless=true")) {
3703 return JNI_ENOMEM;
3704 }
3705 } else {
3706 char buffer[256];
3707 jio_snprintf(buffer, 256, "java.awt.headless=%s", envbuffer);
3708 if (!add_property(buffer)) {
3709 return JNI_ENOMEM;
3710 }
3711 }
3712 }
3713 }
3714
3715 if (!check_vm_args_consistency()) {
3716 return JNI_ERR;
3717 }
3718
3719 return JNI_OK;
3720 }
3721
3722 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3723 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3724 scp_assembly_required_p);
3725 }
3726
3727 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3728 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3729 scp_assembly_required_p);
3730 }
3731
3732 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3733 const int N_MAX_OPTIONS = 64;
3734 const int OPTION_BUFFER_SIZE = 1024;
3735 char buffer[OPTION_BUFFER_SIZE];
3736
3737 // The variable will be ignored if it exceeds the length of the buffer.
3738 // Don't check this variable if user has special privileges
3739 // (e.g. unix su command).
3740 if (os::getenv(name, buffer, sizeof(buffer)) &&
3741 !os::have_special_privileges()) {
3742 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3743 jio_fprintf(defaultStream::error_stream(),
3744 "Picked up %s: %s\n", name, buffer);
3745 char* rd = buffer; // pointer to the input string (rd)
3746 int i;
3747 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3748 while (isspace(*rd)) rd++; // skip whitespace
3749 if (*rd == 0) break; // we re done when the input string is read completely
3750
3751 // The output, option string, overwrites the input string.
3752 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3753 // input string (rd).
3754 char* wrt = rd;
3755
3756 options[i++].optionString = wrt; // Fill in option
3757 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3758 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3759 int quote = *rd; // matching quote to look for
3760 rd++; // don't copy open quote
3761 while (*rd != quote) { // include everything (even spaces) up until quote
3762 if (*rd == 0) { // string termination means unmatched string
3763 jio_fprintf(defaultStream::error_stream(),
3764 "Unmatched quote in %s\n", name);
3765 return JNI_ERR;
3766 }
3767 *wrt++ = *rd++; // copy to option string
3768 }
3769 rd++; // don't copy close quote
3770 } else {
3771 *wrt++ = *rd++; // copy to option string
3772 }
3773 }
3774 // Need to check if we're done before writing a NULL,
3775 // because the write could be to the byte that rd is pointing to.
3776 if (*rd++ == 0) {
3777 *wrt = 0;
3778 break;
3779 }
3780 *wrt = 0; // Zero terminate option
3781 }
3782 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3783 JavaVMInitArgs vm_args;
3784 vm_args.version = JNI_VERSION_1_2;
3785 vm_args.options = options;
3786 vm_args.nOptions = i;
3787 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3788
3789 if (PrintVMOptions) {
3790 const char* tail;
3791 for (int i = 0; i < vm_args.nOptions; i++) {
3792 const JavaVMOption *option = vm_args.options + i;
3793 if (match_option(option, "-XX:", &tail)) {
3794 logOption(tail);
3795 }
3796 }
3797 }
3798
3799 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3800 }
3801 return JNI_OK;
3802 }
3803
3804 void Arguments::set_shared_spaces_flags() {
3805 if (DumpSharedSpaces) {
3806 if (FailOverToOldVerifier) {
3807 // Don't fall back to the old verifier on verification failure. If a
3808 // class fails verification with the split verifier, it might fail the
3809 // CDS runtime verifier constraint check. In that case, we don't want
3810 // to share the class. We only archive classes that pass the split verifier.
3811 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3812 }
3813
3814 if (RequireSharedSpaces) {
3815 warning("cannot dump shared archive while using shared archive");
3816 }
3817 UseSharedSpaces = false;
3818 #ifdef _LP64
3819 if (!UseCompressedOops || !UseCompressedClassPointers) {
3820 vm_exit_during_initialization(
3821 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3822 }
3823 } else {
3824 if (!UseCompressedOops || !UseCompressedClassPointers) {
3825 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3826 }
3827 #endif
3828 }
3829 }
3830
3831 #if !INCLUDE_ALL_GCS
3832 static void force_serial_gc() {
3833 FLAG_SET_DEFAULT(UseSerialGC, true);
3834 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3835 UNSUPPORTED_GC_OPTION(UseG1GC);
3836 UNSUPPORTED_GC_OPTION(UseParallelGC);
3837 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3838 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3839 UNSUPPORTED_GC_OPTION(UseParNewGC);
3840 }
3841 #endif // INCLUDE_ALL_GCS
3842
3843 // Sharing support
3844 // Construct the path to the archive
3845 static char* get_shared_archive_path() {
3846 char *shared_archive_path;
3847 if (SharedArchiveFile == NULL) {
3848 char jvm_path[JVM_MAXPATHLEN];
3849 os::jvm_path(jvm_path, sizeof(jvm_path));
3850 char *end = strrchr(jvm_path, *os::file_separator());
3851 if (end != NULL) *end = '\0';
3852 size_t jvm_path_len = strlen(jvm_path);
3853 size_t file_sep_len = strlen(os::file_separator());
3854 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3855 file_sep_len + 20, mtInternal);
3856 if (shared_archive_path != NULL) {
3857 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3858 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3859 strncat(shared_archive_path, "classes.jsa", 11);
3860 }
3861 } else {
3862 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3863 if (shared_archive_path != NULL) {
3864 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3865 }
3866 }
3867 return shared_archive_path;
3868 }
3869
3870 #ifndef PRODUCT
3871 // Determine whether LogVMOutput should be implicitly turned on.
3872 static bool use_vm_log() {
3873 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3874 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3875 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3876 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3877 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3878 return true;
3879 }
3880
3881 #ifdef COMPILER1
3882 if (PrintC1Statistics) {
3883 return true;
3884 }
3885 #endif // COMPILER1
3886
3887 #ifdef COMPILER2
3888 if (PrintOptoAssembly || PrintOptoStatistics) {
3889 return true;
3890 }
3891 #endif // COMPILER2
3892
3893 return false;
3894 }
3895 #endif // PRODUCT
3896
3897 // Parse entry point called from JNI_CreateJavaVM
3898
3899 jint Arguments::parse(const JavaVMInitArgs* args) {
3900
3901 // Remaining part of option string
3902 const char* tail;
3903
3904 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3905 const char* hotspotrc = ".hotspotrc";
3906 bool settings_file_specified = false;
3907 bool needs_hotspotrc_warning = false;
3908
3909 ArgumentsExt::process_options(args);
3910
3911 const char* flags_file;
3912 int index;
3913 for (index = 0; index < args->nOptions; index++) {
3914 const JavaVMOption *option = args->options + index;
3915 if (match_option(option, "-XX:Flags=", &tail)) {
3916 flags_file = tail;
3917 settings_file_specified = true;
3918 }
3919 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3920 PrintVMOptions = true;
3921 }
3922 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3923 PrintVMOptions = false;
3924 }
3925 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3926 IgnoreUnrecognizedVMOptions = true;
3927 }
3928 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3929 IgnoreUnrecognizedVMOptions = false;
3930 }
3931 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3932 CommandLineFlags::printFlags(tty, false);
3933 vm_exit(0);
3934 }
3935 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3936 #if INCLUDE_NMT
3937 // The launcher did not setup nmt environment variable properly.
3938 if (!MemTracker::check_launcher_nmt_support(tail)) {
3939 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3940 }
3941
3942 // Verify if nmt option is valid.
3943 if (MemTracker::verify_nmt_option()) {
3944 // Late initialization, still in single-threaded mode.
3945 if (MemTracker::tracking_level() >= NMT_summary) {
3946 MemTracker::init();
3947 }
3948 } else {
3949 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3950 }
3951 #else
3952 jio_fprintf(defaultStream::error_stream(),
3953 "Native Memory Tracking is not supported in this VM\n");
3954 return JNI_ERR;
3955 #endif
3956 }
3957
3958
3959 #ifndef PRODUCT
3960 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3961 CommandLineFlags::printFlags(tty, true);
3962 vm_exit(0);
3963 }
3964 #endif
3965 }
3966
3967 if (IgnoreUnrecognizedVMOptions) {
3968 // uncast const to modify the flag args->ignoreUnrecognized
3969 *(jboolean*)(&args->ignoreUnrecognized) = true;
3970 }
3971
3972 // Parse specified settings file
3973 if (settings_file_specified) {
3974 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3975 return JNI_EINVAL;
3976 }
3977 } else {
3978 #ifdef ASSERT
3979 // Parse default .hotspotrc settings file
3980 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3981 return JNI_EINVAL;
3982 }
3983 #else
3984 struct stat buf;
3985 if (os::stat(hotspotrc, &buf) == 0) {
3986 needs_hotspotrc_warning = true;
3987 }
3988 #endif
3989 }
3990
3991 if (PrintVMOptions) {
3992 for (index = 0; index < args->nOptions; index++) {
3993 const JavaVMOption *option = args->options + index;
3994 if (match_option(option, "-XX:", &tail)) {
3995 logOption(tail);
3996 }
3997 }
3998 }
3999
4000 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4001 jint result = parse_vm_init_args(args);
4002 if (result != JNI_OK) {
4003 return result;
4004 }
4005
4006 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4007 SharedArchivePath = get_shared_archive_path();
4008 if (SharedArchivePath == NULL) {
4009 return JNI_ENOMEM;
4010 }
4011
4012 // Set up VerifySharedSpaces
4013 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4014 VerifySharedSpaces = true;
4015 }
4016
4017 // Delay warning until here so that we've had a chance to process
4018 // the -XX:-PrintWarnings flag
4019 if (needs_hotspotrc_warning) {
4020 warning("%s file is present but has been ignored. "
4021 "Run with -XX:Flags=%s to load the file.",
4022 hotspotrc, hotspotrc);
4023 }
4024
4025 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
4026 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4027 #endif
4028
4029 #if INCLUDE_ALL_GCS
4030 #if (defined JAVASE_EMBEDDED || defined ARM)
4031 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
4032 #endif
4033 #endif
4034
4035 #ifndef PRODUCT
4036 if (TraceBytecodesAt != 0) {
4037 TraceBytecodes = true;
4038 }
4039 if (CountCompiledCalls) {
4040 if (UseCounterDecay) {
4041 warning("UseCounterDecay disabled because CountCalls is set");
4042 UseCounterDecay = false;
4043 }
4044 }
4045 #endif // PRODUCT
4046
4047 // JSR 292 is not supported before 1.7
4048 if (!JDK_Version::is_gte_jdk17x_version()) {
4049 if (EnableInvokeDynamic) {
4050 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
4051 warning("JSR 292 is not supported before 1.7. Disabling support.");
4052 }
4053 EnableInvokeDynamic = false;
4054 }
4055 }
4056
4057 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
4058 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4059 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
4060 }
4061 ScavengeRootsInCode = 1;
4062 }
4063
4064 if (PrintGCDetails) {
4065 // Turn on -verbose:gc options as well
4066 PrintGC = true;
4067 }
4068
4069 if (!JDK_Version::is_gte_jdk18x_version()) {
4070 // To avoid changing the log format for 7 updates this flag is only
4071 // true by default in JDK8 and above.
4072 if (FLAG_IS_DEFAULT(PrintGCCause)) {
4073 FLAG_SET_DEFAULT(PrintGCCause, false);
4074 }
4075 }
4076
4077 // Set object alignment values.
4078 set_object_alignment();
4079
4080 #if !INCLUDE_ALL_GCS
4081 force_serial_gc();
4082 #endif // INCLUDE_ALL_GCS
4083 #if !INCLUDE_CDS
4084 if (DumpSharedSpaces || RequireSharedSpaces) {
4085 jio_fprintf(defaultStream::error_stream(),
4086 "Shared spaces are not supported in this VM\n");
4087 return JNI_ERR;
4088 }
4089 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4090 warning("Shared spaces are not supported in this VM");
4091 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4092 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4093 }
4094 no_shared_spaces("CDS Disabled");
4095 #endif // INCLUDE_CDS
4096
4097 return JNI_OK;
4098 }
4099
4100 jint Arguments::apply_ergo() {
4101
4102 // Set flags based on ergonomics.
4103 set_ergonomics_flags();
4104
4105 set_shared_spaces_flags();
4106
4107 #if defined(SPARC)
4108 // BIS instructions require 'membar' instruction regardless of the number
4109 // of CPUs because in virtualized/container environments which might use only 1
4110 // CPU, BIS instructions may produce incorrect results.
4111
4112 if (FLAG_IS_DEFAULT(AssumeMP)) {
4113 FLAG_SET_DEFAULT(AssumeMP, true);
4114 }
4115 #endif
4116
4117 // Check the GC selections again.
4118 if (!check_gc_consistency()) {
4119 return JNI_EINVAL;
4120 }
4121
4122 if (TieredCompilation) {
4123 set_tiered_flags();
4124 } else {
4125 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
4126 if (CompilationPolicyChoice >= 2) {
4127 vm_exit_during_initialization(
4128 "Incompatible compilation policy selected", NULL);
4129 }
4130 }
4131 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
4132 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4133 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
4134 }
4135
4136
4137 // Set heap size based on available physical memory
4138 set_heap_size();
4139
4140 ArgumentsExt::set_gc_specific_flags();
4141
4142 // Initialize Metaspace flags and alignments.
4143 Metaspace::ergo_initialize();
4144
4145 // Set bytecode rewriting flags
4146 set_bytecode_flags();
4147
4148 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
4149 set_aggressive_opts_flags();
4150
4151 // Turn off biased locking for locking debug mode flags,
4152 // which are subtlely different from each other but neither works with
4153 // biased locking.
4154 if (UseHeavyMonitors
4155 #ifdef COMPILER1
4156 || !UseFastLocking
4157 #endif // COMPILER1
4158 ) {
4159 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4160 // flag set to true on command line; warn the user that they
4161 // can't enable biased locking here
4162 warning("Biased Locking is not supported with locking debug flags"
4163 "; ignoring UseBiasedLocking flag." );
4164 }
4165 UseBiasedLocking = false;
4166 }
4167
4168 #ifdef ZERO
4169 // Clear flags not supported on zero.
4170 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4171 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4172 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4173 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4174 #endif // CC_INTERP
4175
4176 #ifdef COMPILER2
4177 if (!EliminateLocks) {
4178 EliminateNestedLocks = false;
4179 }
4180 if (!Inline) {
4181 IncrementalInline = false;
4182 }
4183 #ifndef PRODUCT
4184 if (!IncrementalInline) {
4185 AlwaysIncrementalInline = false;
4186 }
4187 #endif
4188 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
4189 // incremental inlining: bump MaxNodeLimit
4190 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
4191 }
4192 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4193 // nothing to use the profiling, turn if off
4194 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4195 }
4196 #endif
4197
4198 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4199 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4200 DebugNonSafepoints = true;
4201 }
4202
4203 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4204 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4205 }
4206
4207 if (UseOnStackReplacement && !UseLoopCounter) {
4208 warning("On-stack-replacement requires loop counters; enabling loop counters");
4209 FLAG_SET_DEFAULT(UseLoopCounter, true);
4210 }
4211
4212 #ifndef PRODUCT
4213 if (CompileTheWorld) {
4214 // Force NmethodSweeper to sweep whole CodeCache each time.
4215 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4216 NmethodSweepFraction = 1;
4217 }
4218 }
4219
4220 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4221 if (use_vm_log()) {
4222 LogVMOutput = true;
4223 }
4224 }
4225 #endif // PRODUCT
4226
4227 if (PrintCommandLineFlags) {
4228 CommandLineFlags::printSetFlags(tty);
4229 }
4230
4231 // Apply CPU specific policy for the BiasedLocking
4232 if (UseBiasedLocking) {
4233 if (!VM_Version::use_biased_locking() &&
4234 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4235 UseBiasedLocking = false;
4236 }
4237 }
4238 #ifdef COMPILER2
4239 if (!UseBiasedLocking || EmitSync != 0) {
4240 UseOptoBiasInlining = false;
4241 }
4242 #endif
4243
4244 // set PauseAtExit if the gamma launcher was used and a debugger is attached
4245 // but only if not already set on the commandline
4246 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
4247 bool set = false;
4248 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
4249 if (!set) {
4250 FLAG_SET_DEFAULT(PauseAtExit, true);
4251 }
4252 }
4253
4254 return JNI_OK;
4255 }
4256
4257 jint Arguments::adjust_after_os() {
4258 if (UseNUMA) {
4259 if (UseParallelGC || UseParallelOldGC) {
4260 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4261 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4262 }
4263 }
4264 // UseNUMAInterleaving is set to ON for all collectors and
4265 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4266 // such as the parallel collector for Linux and Solaris will
4267 // interleave old gen and survivor spaces on top of NUMA
4268 // allocation policy for the eden space.
4269 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4270 // all platforms and ParallelGC on Windows will interleave all
4271 // of the heap spaces across NUMA nodes.
4272 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4273 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4274 }
4275 }
4276 return JNI_OK;
4277 }
4278
4279 int Arguments::PropertyList_count(SystemProperty* pl) {
4280 int count = 0;
4281 while(pl != NULL) {
4282 count++;
4283 pl = pl->next();
4284 }
4285 return count;
4286 }
4287
4288 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4289 assert(key != NULL, "just checking");
4290 SystemProperty* prop;
4291 for (prop = pl; prop != NULL; prop = prop->next()) {
4292 if (strcmp(key, prop->key()) == 0) return prop->value();
4293 }
4294 return NULL;
4295 }
4296
4297 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4298 int count = 0;
4299 const char* ret_val = NULL;
4300
4301 while(pl != NULL) {
4302 if(count >= index) {
4303 ret_val = pl->key();
4304 break;
4305 }
4306 count++;
4307 pl = pl->next();
4308 }
4309
4310 return ret_val;
4311 }
4312
4313 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4314 int count = 0;
4315 char* ret_val = NULL;
4316
4317 while(pl != NULL) {
4318 if(count >= index) {
4319 ret_val = pl->value();
4320 break;
4321 }
4322 count++;
4323 pl = pl->next();
4324 }
4325
4326 return ret_val;
4327 }
4328
4329 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4330 SystemProperty* p = *plist;
4331 if (p == NULL) {
4332 *plist = new_p;
4333 } else {
4334 while (p->next() != NULL) {
4335 p = p->next();
4336 }
4337 p->set_next(new_p);
4338 }
4339 }
4340
4341 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4342 if (plist == NULL)
4343 return;
4344
4345 SystemProperty* new_p = new SystemProperty(k, v, true);
4346 PropertyList_add(plist, new_p);
4347 }
4348
4349 // This add maintains unique property key in the list.
4350 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4351 if (plist == NULL)
4352 return;
4353
4354 // If property key exist then update with new value.
4355 SystemProperty* prop;
4356 for (prop = *plist; prop != NULL; prop = prop->next()) {
4357 if (strcmp(k, prop->key()) == 0) {
4358 if (append) {
4359 prop->append_value(v);
4360 } else {
4361 prop->set_value(v);
4362 }
4363 return;
4364 }
4365 }
4366
4367 PropertyList_add(plist, k, v);
4368 }
4369
4370 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4371 // Returns true if all of the source pointed by src has been copied over to
4372 // the destination buffer pointed by buf. Otherwise, returns false.
4373 // Notes:
4374 // 1. If the length (buflen) of the destination buffer excluding the
4375 // NULL terminator character is not long enough for holding the expanded
4376 // pid characters, it also returns false instead of returning the partially
4377 // expanded one.
4378 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4379 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4380 char* buf, size_t buflen) {
4381 const char* p = src;
4382 char* b = buf;
4383 const char* src_end = &src[srclen];
4384 char* buf_end = &buf[buflen - 1];
4385
4386 while (p < src_end && b < buf_end) {
4387 if (*p == '%') {
4388 switch (*(++p)) {
4389 case '%': // "%%" ==> "%"
4390 *b++ = *p++;
4391 break;
4392 case 'p': { // "%p" ==> current process id
4393 // buf_end points to the character before the last character so
4394 // that we could write '\0' to the end of the buffer.
4395 size_t buf_sz = buf_end - b + 1;
4396 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4397
4398 // if jio_snprintf fails or the buffer is not long enough to hold
4399 // the expanded pid, returns false.
4400 if (ret < 0 || ret >= (int)buf_sz) {
4401 return false;
4402 } else {
4403 b += ret;
4404 assert(*b == '\0', "fail in copy_expand_pid");
4405 if (p == src_end && b == buf_end + 1) {
4406 // reach the end of the buffer.
4407 return true;
4408 }
4409 }
4410 p++;
4411 break;
4412 }
4413 default :
4414 *b++ = '%';
4415 }
4416 } else {
4417 *b++ = *p++;
4418 }
4419 }
4420 *b = '\0';
4421 return (p == src_end); // return false if not all of the source was copied
4422 }