1 /*
2 * Copyright (c) 1997, 2019, 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 #include "gc_implementation/shenandoah/shenandoahHeap.hpp"
70 #include "gc_implementation/shenandoah/shenandoahLogging.hpp"
71 #include "gc_implementation/shenandoah/shenandoahHeapRegion.hpp"
72 #endif // INCLUDE_ALL_GCS
73
74 // Note: This is a special bug reporting site for the JVM
75 #ifdef VENDOR_URL_VM_BUG
76 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
77 #else
78 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
79 #endif
80 #define DEFAULT_JAVA_LAUNCHER "generic"
81
82 // Disable options not supported in this release, with a warning if they
83 // were explicitly requested on the command-line
84 #define UNSUPPORTED_OPTION(opt, description) \
85 do { \
86 if (opt) { \
87 if (FLAG_IS_CMDLINE(opt)) { \
88 warning(description " is disabled in this release."); \
89 } \
90 FLAG_SET_DEFAULT(opt, false); \
91 } \
92 } while(0)
93
94 #define UNSUPPORTED_GC_OPTION(gc) \
95 do { \
96 if (gc) { \
97 if (FLAG_IS_CMDLINE(gc)) { \
98 warning(#gc " is not supported in this VM. Using Serial GC."); \
99 } \
100 FLAG_SET_DEFAULT(gc, false); \
101 } \
102 } while(0)
103
104 char** Arguments::_jvm_flags_array = NULL;
105 int Arguments::_num_jvm_flags = 0;
106 char** Arguments::_jvm_args_array = NULL;
107 int Arguments::_num_jvm_args = 0;
108 char* Arguments::_java_command = NULL;
109 SystemProperty* Arguments::_system_properties = NULL;
110 const char* Arguments::_gc_log_filename = NULL;
111 bool Arguments::_has_profile = false;
112 size_t Arguments::_conservative_max_heap_alignment = 0;
113 uintx Arguments::_min_heap_size = 0;
114 uintx Arguments::_min_heap_free_ratio = 0;
115 uintx Arguments::_max_heap_free_ratio = 0;
116 Arguments::Mode Arguments::_mode = _mixed;
117 bool Arguments::_java_compiler = false;
118 bool Arguments::_xdebug_mode = false;
119 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
120 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
121 int Arguments::_sun_java_launcher_pid = -1;
122 bool Arguments::_created_by_gamma_launcher = false;
123
124 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
125 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
126 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
127 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
128 bool Arguments::_ClipInlining = ClipInlining;
129
130 char* Arguments::SharedArchivePath = NULL;
131
132 AgentLibraryList Arguments::_libraryList;
133 AgentLibraryList Arguments::_agentList;
134
135 abort_hook_t Arguments::_abort_hook = NULL;
136 exit_hook_t Arguments::_exit_hook = NULL;
137 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
138
139
140 SystemProperty *Arguments::_java_ext_dirs = NULL;
141 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
142 SystemProperty *Arguments::_sun_boot_library_path = NULL;
143 SystemProperty *Arguments::_java_library_path = NULL;
144 SystemProperty *Arguments::_java_home = NULL;
145 SystemProperty *Arguments::_java_class_path = NULL;
146 SystemProperty *Arguments::_sun_boot_class_path = NULL;
147
148 char* Arguments::_meta_index_path = NULL;
149 char* Arguments::_meta_index_dir = NULL;
150
151 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
152
153 static bool match_option(const JavaVMOption *option, const char* name,
154 const char** tail) {
155 int len = (int)strlen(name);
156 if (strncmp(option->optionString, name, len) == 0) {
157 *tail = option->optionString + len;
158 return true;
159 } else {
160 return false;
161 }
162 }
163
164 #if INCLUDE_JFR
165 // return true on failure
166 static bool match_jfr_option(const JavaVMOption** option) {
167 assert((*option)->optionString != NULL, "invariant");
168 char* tail = NULL;
169 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) {
170 return Jfr::on_start_flight_recording_option(option, tail);
171 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) {
172 return Jfr::on_flight_recorder_option(option, tail);
173 }
174 return false;
175 }
176 #endif
177
178 static void logOption(const char* opt) {
179 if (PrintVMOptions) {
180 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
181 }
182 }
183
184 // Process java launcher properties.
185 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
186 // See if sun.java.launcher or sun.java.launcher.pid is defined.
187 // Must do this before setting up other system properties,
188 // as some of them may depend on launcher type.
189 for (int index = 0; index < args->nOptions; index++) {
190 const JavaVMOption* option = args->options + index;
191 const char* tail;
192
193 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
194 process_java_launcher_argument(tail, option->extraInfo);
195 continue;
196 }
197 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
198 _sun_java_launcher_pid = atoi(tail);
199 continue;
200 }
201 }
202 }
203
204 // Initialize system properties key and value.
205 void Arguments::init_system_properties() {
206
207 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
208 "Java Virtual Machine Specification", false));
209 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
210 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
211 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
212
213 // following are JVMTI agent writeable properties.
214 // Properties values are set to NULL and they are
215 // os specific they are initialized in os::init_system_properties_values().
216 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
217 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
218 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
219 _java_library_path = new SystemProperty("java.library.path", NULL, true);
220 _java_home = new SystemProperty("java.home", NULL, true);
221 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
222
223 _java_class_path = new SystemProperty("java.class.path", "", true);
224
225 // Add to System Property list.
226 PropertyList_add(&_system_properties, _java_ext_dirs);
227 PropertyList_add(&_system_properties, _java_endorsed_dirs);
228 PropertyList_add(&_system_properties, _sun_boot_library_path);
229 PropertyList_add(&_system_properties, _java_library_path);
230 PropertyList_add(&_system_properties, _java_home);
231 PropertyList_add(&_system_properties, _java_class_path);
232 PropertyList_add(&_system_properties, _sun_boot_class_path);
233
234 // Set OS specific system properties values
235 os::init_system_properties_values();
236 }
237
238
239 // Update/Initialize System properties after JDK version number is known
240 void Arguments::init_version_specific_system_properties() {
241 enum { bufsz = 16 };
242 char buffer[bufsz];
243 const char* spec_vendor = "Sun Microsystems Inc.";
244 uint32_t spec_version = 0;
245
246 if (JDK_Version::is_gte_jdk17x_version()) {
247 spec_vendor = "Oracle Corporation";
248 spec_version = JDK_Version::current().major_version();
249 }
250 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
251
252 PropertyList_add(&_system_properties,
253 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
254 PropertyList_add(&_system_properties,
255 new SystemProperty("java.vm.specification.version", buffer, false));
256 PropertyList_add(&_system_properties,
257 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
258 }
259
260 /**
261 * Provide a slightly more user-friendly way of eliminating -XX flags.
262 * When a flag is eliminated, it can be added to this list in order to
263 * continue accepting this flag on the command-line, while issuing a warning
264 * and ignoring the value. Once the JDK version reaches the 'accept_until'
265 * limit, we flatly refuse to admit the existence of the flag. This allows
266 * a flag to die correctly over JDK releases using HSX.
267 */
268 typedef struct {
269 const char* name;
270 JDK_Version obsoleted_in; // when the flag went away
271 JDK_Version accept_until; // which version to start denying the existence
272 } ObsoleteFlag;
273
274 static ObsoleteFlag obsolete_jvm_flags[] = {
275 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
276 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
277 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
278 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
279 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
280 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
281 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
282 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
283 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
284 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
285 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
286 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
287 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
288 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
289 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
290 { "DefaultInitialRAMFraction",
291 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
292 { "UseDepthFirstScavengeOrder",
293 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
294 { "HandlePromotionFailure",
295 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
296 { "MaxLiveObjectEvacuationRatio",
297 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
298 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
299 { "UseParallelOldGCCompacting",
300 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
301 { "UseParallelDensePrefixUpdate",
302 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
303 { "UseParallelOldGCDensePrefix",
304 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
305 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
306 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
307 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
308 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
309 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
310 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
311 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
312 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
313 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
314 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
315 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
316 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
317 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
318 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
319 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
320 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
321 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
322 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
323 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
324 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
325 { "UseOldInlining", JDK_Version::jdk_update(8, 20), JDK_Version::jdk(10) },
326 { "AutoShutdownNMT", JDK_Version::jdk_update(8, 40), JDK_Version::jdk(10) },
327 { "CompilationRepeat", JDK_Version::jdk(8), JDK_Version::jdk(9) },
328 { "SegmentedHeapDumpThreshold", JDK_Version::jdk_update(8, 252), JDK_Version::jdk(10) },
329 #ifdef PRODUCT
330 { "DesiredMethodLimit",
331 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
332 #endif // PRODUCT
333 { NULL, JDK_Version(0), JDK_Version(0) }
334 };
335
336 // Returns true if the flag is obsolete and fits into the range specified
337 // for being ignored. In the case that the flag is ignored, the 'version'
338 // value is filled in with the version number when the flag became
339 // obsolete so that that value can be displayed to the user.
340 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
341 int i = 0;
342 assert(version != NULL, "Must provide a version buffer");
343 while (obsolete_jvm_flags[i].name != NULL) {
344 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
345 // <flag>=xxx form
346 // [-|+]<flag> form
347 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
348 ((s[0] == '+' || s[0] == '-') &&
349 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
350 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
351 *version = flag_status.obsoleted_in;
352 return true;
353 }
354 }
355 i++;
356 }
357 return false;
358 }
359
360 // Constructs the system class path (aka boot class path) from the following
361 // components, in order:
362 //
363 // prefix // from -Xbootclasspath/p:...
364 // endorsed // the expansion of -Djava.endorsed.dirs=...
365 // base // from os::get_system_properties() or -Xbootclasspath=
366 // suffix // from -Xbootclasspath/a:...
367 //
368 // java.endorsed.dirs is a list of directories; any jar or zip files in the
369 // directories are added to the sysclasspath just before the base.
370 //
371 // This could be AllStatic, but it isn't needed after argument processing is
372 // complete.
373 class SysClassPath: public StackObj {
374 public:
375 SysClassPath(const char* base);
376 ~SysClassPath();
377
378 inline void set_base(const char* base);
379 inline void add_prefix(const char* prefix);
380 inline void add_suffix_to_prefix(const char* suffix);
381 inline void add_suffix(const char* suffix);
382 inline void reset_path(const char* base);
383
384 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
385 // property. Must be called after all command-line arguments have been
386 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
387 // combined_path().
388 void expand_endorsed();
389
390 inline const char* get_base() const { return _items[_scp_base]; }
391 inline const char* get_prefix() const { return _items[_scp_prefix]; }
392 inline const char* get_suffix() const { return _items[_scp_suffix]; }
393 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
394
395 // Combine all the components into a single c-heap-allocated string; caller
396 // must free the string if/when no longer needed.
397 char* combined_path();
398
399 private:
400 // Utility routines.
401 static char* add_to_path(const char* path, const char* str, bool prepend);
402 static char* add_jars_to_path(char* path, const char* directory);
403
404 inline void reset_item_at(int index);
405
406 // Array indices for the items that make up the sysclasspath. All except the
407 // base are allocated in the C heap and freed by this class.
408 enum {
409 _scp_prefix, // from -Xbootclasspath/p:...
410 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
411 _scp_base, // the default sysclasspath
412 _scp_suffix, // from -Xbootclasspath/a:...
413 _scp_nitems // the number of items, must be last.
414 };
415
416 const char* _items[_scp_nitems];
417 DEBUG_ONLY(bool _expansion_done;)
418 };
419
420 SysClassPath::SysClassPath(const char* base) {
421 memset(_items, 0, sizeof(_items));
422 _items[_scp_base] = base;
423 DEBUG_ONLY(_expansion_done = false;)
424 }
425
426 SysClassPath::~SysClassPath() {
427 // Free everything except the base.
428 for (int i = 0; i < _scp_nitems; ++i) {
429 if (i != _scp_base) reset_item_at(i);
430 }
431 DEBUG_ONLY(_expansion_done = false;)
432 }
433
434 inline void SysClassPath::set_base(const char* base) {
435 _items[_scp_base] = base;
436 }
437
438 inline void SysClassPath::add_prefix(const char* prefix) {
439 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
440 }
441
442 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
443 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
444 }
445
446 inline void SysClassPath::add_suffix(const char* suffix) {
447 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
448 }
449
450 inline void SysClassPath::reset_item_at(int index) {
451 assert(index < _scp_nitems && index != _scp_base, "just checking");
452 if (_items[index] != NULL) {
453 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
454 _items[index] = NULL;
455 }
456 }
457
458 inline void SysClassPath::reset_path(const char* base) {
459 // Clear the prefix and suffix.
460 reset_item_at(_scp_prefix);
461 reset_item_at(_scp_suffix);
462 set_base(base);
463 }
464
465 //------------------------------------------------------------------------------
466
467 void SysClassPath::expand_endorsed() {
468 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
469
470 const char* path = Arguments::get_property("java.endorsed.dirs");
471 if (path == NULL) {
472 path = Arguments::get_endorsed_dir();
473 assert(path != NULL, "no default for java.endorsed.dirs");
474 }
475
476 char* expanded_path = NULL;
477 const char separator = *os::path_separator();
478 const char* const end = path + strlen(path);
479 while (path < end) {
480 const char* tmp_end = strchr(path, separator);
481 if (tmp_end == NULL) {
482 expanded_path = add_jars_to_path(expanded_path, path);
483 path = end;
484 } else {
485 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
486 memcpy(dirpath, path, tmp_end - path);
487 dirpath[tmp_end - path] = '\0';
488 expanded_path = add_jars_to_path(expanded_path, dirpath);
489 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
490 path = tmp_end + 1;
491 }
492 }
493 _items[_scp_endorsed] = expanded_path;
494 DEBUG_ONLY(_expansion_done = true;)
495 }
496
497 // Combine the bootclasspath elements, some of which may be null, into a single
498 // c-heap-allocated string.
499 char* SysClassPath::combined_path() {
500 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
501 assert(_expansion_done, "must call expand_endorsed() first.");
502
503 size_t lengths[_scp_nitems];
504 size_t total_len = 0;
505
506 const char separator = *os::path_separator();
507
508 // Get the lengths.
509 int i;
510 for (i = 0; i < _scp_nitems; ++i) {
511 if (_items[i] != NULL) {
512 lengths[i] = strlen(_items[i]);
513 // Include space for the separator char (or a NULL for the last item).
514 total_len += lengths[i] + 1;
515 }
516 }
517 assert(total_len > 0, "empty sysclasspath not allowed");
518
519 // Copy the _items to a single string.
520 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
521 char* cp_tmp = cp;
522 for (i = 0; i < _scp_nitems; ++i) {
523 if (_items[i] != NULL) {
524 memcpy(cp_tmp, _items[i], lengths[i]);
525 cp_tmp += lengths[i];
526 *cp_tmp++ = separator;
527 }
528 }
529 *--cp_tmp = '\0'; // Replace the extra separator.
530 return cp;
531 }
532
533 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
534 char*
535 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
536 char *cp;
537
538 assert(str != NULL, "just checking");
539 if (path == NULL) {
540 size_t len = strlen(str) + 1;
541 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
542 memcpy(cp, str, len); // copy the trailing null
543 } else {
544 const char separator = *os::path_separator();
545 size_t old_len = strlen(path);
546 size_t str_len = strlen(str);
547 size_t len = old_len + str_len + 2;
548
549 if (prepend) {
550 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
551 char* cp_tmp = cp;
552 memcpy(cp_tmp, str, str_len);
553 cp_tmp += str_len;
554 *cp_tmp = separator;
555 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
556 FREE_C_HEAP_ARRAY(char, path, mtInternal);
557 } else {
558 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
559 char* cp_tmp = cp + old_len;
560 *cp_tmp = separator;
561 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
562 }
563 }
564 return cp;
565 }
566
567 // Scan the directory and append any jar or zip files found to path.
568 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
569 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
570 DIR* dir = os::opendir(directory);
571 if (dir == NULL) return path;
572
573 char dir_sep[2] = { '\0', '\0' };
574 size_t directory_len = strlen(directory);
575 const char fileSep = *os::file_separator();
576 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
577
578 /* Scan the directory for jars/zips, appending them to path. */
579 struct dirent *entry;
580 while ((entry = os::readdir(dir)) != NULL) {
581 const char* name = entry->d_name;
582 const char* ext = name + strlen(name) - 4;
583 bool isJarOrZip = ext > name &&
584 (os::file_name_strcmp(ext, ".jar") == 0 ||
585 os::file_name_strcmp(ext, ".zip") == 0);
586 if (isJarOrZip) {
587 size_t length = directory_len + 2 + strlen(name);
588 char* jarpath = NEW_C_HEAP_ARRAY(char, length, mtInternal);
589 jio_snprintf(jarpath, length, "%s%s%s", directory, dir_sep, name);
590 path = add_to_path(path, jarpath, false);
591 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
592 }
593 }
594 os::closedir(dir);
595 return path;
596 }
597
598 // Parses a memory size specification string.
599 static bool atomull(const char *s, julong* result) {
600 julong n = 0;
601 int args_read = sscanf(s, JULONG_FORMAT, &n);
602 if (args_read != 1) {
603 return false;
604 }
605 while (*s != '\0' && isdigit(*s)) {
606 s++;
607 }
608 // 4705540: illegal if more characters are found after the first non-digit
609 if (strlen(s) > 1) {
610 return false;
611 }
612 switch (*s) {
613 case 'T': case 't':
614 *result = n * G * K;
615 // Check for overflow.
616 if (*result/((julong)G * K) != n) return false;
617 return true;
618 case 'G': case 'g':
619 *result = n * G;
620 if (*result/G != n) return false;
621 return true;
622 case 'M': case 'm':
623 *result = n * M;
624 if (*result/M != n) return false;
625 return true;
626 case 'K': case 'k':
627 *result = n * K;
628 if (*result/K != n) return false;
629 return true;
630 case '\0':
631 *result = n;
632 return true;
633 default:
634 return false;
635 }
636 }
637
638 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
639 if (size < min_size) return arg_too_small;
640 // Check that size will fit in a size_t (only relevant on 32-bit)
641 if (size > max_uintx) return arg_too_big;
642 return arg_in_range;
643 }
644
645 // Describe an argument out of range error
646 void Arguments::describe_range_error(ArgsRange errcode) {
647 switch(errcode) {
648 case arg_too_big:
649 jio_fprintf(defaultStream::error_stream(),
650 "The specified size exceeds the maximum "
651 "representable size.\n");
652 break;
653 case arg_too_small:
654 case arg_unreadable:
655 case arg_in_range:
656 // do nothing for now
657 break;
658 default:
659 ShouldNotReachHere();
660 }
661 }
662
663 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
664 return CommandLineFlags::boolAtPut(name, &value, origin);
665 }
666
667 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
668 double v;
669 if (sscanf(value, "%lf", &v) != 1) {
670 return false;
671 }
672
673 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
674 return true;
675 }
676 return false;
677 }
678
679 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
680 julong v;
681 intx intx_v;
682 bool is_neg = false;
683 // Check the sign first since atomull() parses only unsigned values.
684 if (*value == '-') {
685 if (!CommandLineFlags::intxAt(name, &intx_v)) {
686 return false;
687 }
688 value++;
689 is_neg = true;
690 }
691 if (!atomull(value, &v)) {
692 return false;
693 }
694 intx_v = (intx) v;
695 if (is_neg) {
696 intx_v = -intx_v;
697 }
698 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
699 return true;
700 }
701 uintx uintx_v = (uintx) v;
702 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
703 return true;
704 }
705 uint64_t uint64_t_v = (uint64_t) v;
706 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
707 return true;
708 }
709 return false;
710 }
711
712 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
713 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
714 // Contract: CommandLineFlags always returns a pointer that needs freeing.
715 FREE_C_HEAP_ARRAY(char, value, mtInternal);
716 return true;
717 }
718
719 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
720 const char* old_value = "";
721 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
722 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
723 size_t new_len = strlen(new_value);
724 const char* value;
725 char* free_this_too = NULL;
726 if (old_len == 0) {
727 value = new_value;
728 } else if (new_len == 0) {
729 value = old_value;
730 } else {
731 size_t length = old_len + 1 + new_len + 1;
732 char* buf = NEW_C_HEAP_ARRAY(char, length, mtInternal);
733 // each new setting adds another LINE to the switch:
734 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
735 value = buf;
736 free_this_too = buf;
737 }
738 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
739 // CommandLineFlags always returns a pointer that needs freeing.
740 FREE_C_HEAP_ARRAY(char, value, mtInternal);
741 if (free_this_too != NULL) {
742 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
743 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
744 }
745 return true;
746 }
747
748 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
749
750 // range of acceptable characters spelled out for portability reasons
751 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
752 #define BUFLEN 255
753 char name[BUFLEN+1];
754 char dummy;
755
756 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
757 return set_bool_flag(name, false, origin);
758 }
759 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
760 return set_bool_flag(name, true, origin);
761 }
762
763 char punct;
764 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
765 const char* value = strchr(arg, '=') + 1;
766 Flag* flag = Flag::find_flag(name, strlen(name));
767 if (flag != NULL && flag->is_ccstr()) {
768 if (flag->ccstr_accumulates()) {
769 return append_to_string_flag(name, value, origin);
770 } else {
771 if (value[0] == '\0') {
772 value = NULL;
773 }
774 return set_string_flag(name, value, origin);
775 }
776 }
777 }
778
779 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
780 const char* value = strchr(arg, '=') + 1;
781 // -XX:Foo:=xxx will reset the string flag to the given value.
782 if (value[0] == '\0') {
783 value = NULL;
784 }
785 return set_string_flag(name, value, origin);
786 }
787
788 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
789 #define SIGNED_NUMBER_RANGE "[-0123456789]"
790 #define NUMBER_RANGE "[0123456789]"
791 char value[BUFLEN + 1];
792 char value2[BUFLEN + 1];
793 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
794 // Looks like a floating-point number -- try again with more lenient format string
795 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
796 return set_fp_numeric_flag(name, value, origin);
797 }
798 }
799
800 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
801 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
802 return set_numeric_flag(name, value, origin);
803 }
804
805 return false;
806 }
807
808 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
809 assert(bldarray != NULL, "illegal argument");
810
811 if (arg == NULL) {
812 return;
813 }
814
815 int new_count = *count + 1;
816
817 // expand the array and add arg to the last element
818 if (*bldarray == NULL) {
819 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
820 } else {
821 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
822 }
823 (*bldarray)[*count] = strdup(arg);
824 *count = new_count;
825 }
826
827 void Arguments::build_jvm_args(const char* arg) {
828 add_string(&_jvm_args_array, &_num_jvm_args, arg);
829 }
830
831 void Arguments::build_jvm_flags(const char* arg) {
832 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
833 }
834
835 // utility function to return a string that concatenates all
836 // strings in a given char** array
837 const char* Arguments::build_resource_string(char** args, int count) {
838 if (args == NULL || count == 0) {
839 return NULL;
840 }
841 size_t length = 0;
842 for (int i = 0; i < count; i++) {
843 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
844 }
845 char* s = NEW_RESOURCE_ARRAY(char, length);
846 char* dst = s;
847 for (int j = 0; j < count; j++) {
848 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
849 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
850 dst += offset;
851 length -= offset;
852 }
853 return (const char*) s;
854 }
855
856 void Arguments::print_on(outputStream* st) {
857 st->print_cr("VM Arguments:");
858 if (num_jvm_flags() > 0) {
859 st->print("jvm_flags: "); print_jvm_flags_on(st);
860 }
861 if (num_jvm_args() > 0) {
862 st->print("jvm_args: "); print_jvm_args_on(st);
863 }
864 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
865 if (_java_class_path != NULL) {
866 char* path = _java_class_path->value();
867 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
868 }
869 st->print_cr("Launcher Type: %s", _sun_java_launcher);
870 }
871
872 void Arguments::print_jvm_flags_on(outputStream* st) {
873 if (_num_jvm_flags > 0) {
874 for (int i=0; i < _num_jvm_flags; i++) {
875 st->print("%s ", _jvm_flags_array[i]);
876 }
877 st->cr();
878 }
879 }
880
881 void Arguments::print_jvm_args_on(outputStream* st) {
882 if (_num_jvm_args > 0) {
883 for (int i=0; i < _num_jvm_args; i++) {
884 st->print("%s ", _jvm_args_array[i]);
885 }
886 st->cr();
887 }
888 }
889
890 bool Arguments::process_argument(const char* arg,
891 jboolean ignore_unrecognized, Flag::Flags origin) {
892
893 JDK_Version since = JDK_Version();
894
895 if (parse_argument(arg, origin) || ignore_unrecognized) {
896 return true;
897 }
898
899 bool has_plus_minus = (*arg == '+' || *arg == '-');
900 const char* const argname = has_plus_minus ? arg + 1 : arg;
901 if (is_newly_obsolete(arg, &since)) {
902 char version[256];
903 since.to_string(version, sizeof(version));
904 warning("ignoring option %s; support was removed in %s", argname, version);
905 return true;
906 }
907
908 // For locked flags, report a custom error message if available.
909 // Otherwise, report the standard unrecognized VM option.
910
911 size_t arg_len;
912 const char* equal_sign = strchr(argname, '=');
913 if (equal_sign == NULL) {
914 arg_len = strlen(argname);
915 } else {
916 arg_len = equal_sign - argname;
917 }
918
919 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
920 if (found_flag != NULL) {
921 char locked_message_buf[BUFLEN];
922 found_flag->get_locked_message(locked_message_buf, BUFLEN);
923 if (strlen(locked_message_buf) == 0) {
924 if (found_flag->is_bool() && !has_plus_minus) {
925 jio_fprintf(defaultStream::error_stream(),
926 "Missing +/- setting for VM option '%s'\n", argname);
927 } else if (!found_flag->is_bool() && has_plus_minus) {
928 jio_fprintf(defaultStream::error_stream(),
929 "Unexpected +/- setting in VM option '%s'\n", argname);
930 } else {
931 jio_fprintf(defaultStream::error_stream(),
932 "Improperly specified VM option '%s'\n", argname);
933 }
934 } else {
935 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
936 }
937 } else {
938 jio_fprintf(defaultStream::error_stream(),
939 "Unrecognized VM option '%s'\n", argname);
940 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
941 if (fuzzy_matched != NULL) {
942 jio_fprintf(defaultStream::error_stream(),
943 "Did you mean '%s%s%s'?\n",
944 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
945 fuzzy_matched->_name,
946 (fuzzy_matched->is_bool()) ? "" : "=<value>");
947 }
948 }
949
950 // allow for commandline "commenting out" options like -XX:#+Verbose
951 return arg[0] == '#';
952 }
953
954 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
955 FILE* stream = fopen(file_name, "rb");
956 if (stream == NULL) {
957 if (should_exist) {
958 jio_fprintf(defaultStream::error_stream(),
959 "Could not open settings file %s\n", file_name);
960 return false;
961 } else {
962 return true;
963 }
964 }
965
966 char token[1024];
967 int pos = 0;
968
969 bool in_white_space = true;
970 bool in_comment = false;
971 bool in_quote = false;
972 char quote_c = 0;
973 bool result = true;
974
975 int c = getc(stream);
976 while(c != EOF && pos < (int)(sizeof(token)-1)) {
977 if (in_white_space) {
978 if (in_comment) {
979 if (c == '\n') in_comment = false;
980 } else {
981 if (c == '#') in_comment = true;
982 else if (!isspace(c)) {
983 in_white_space = false;
984 token[pos++] = c;
985 }
986 }
987 } else {
988 if (c == '\n' || (!in_quote && isspace(c))) {
989 // token ends at newline, or at unquoted whitespace
990 // this allows a way to include spaces in string-valued options
991 token[pos] = '\0';
992 logOption(token);
993 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
994 build_jvm_flags(token);
995 pos = 0;
996 in_white_space = true;
997 in_quote = false;
998 } else if (!in_quote && (c == '\'' || c == '"')) {
999 in_quote = true;
1000 quote_c = c;
1001 } else if (in_quote && (c == quote_c)) {
1002 in_quote = false;
1003 } else {
1004 token[pos++] = c;
1005 }
1006 }
1007 c = getc(stream);
1008 }
1009 if (pos > 0) {
1010 token[pos] = '\0';
1011 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1012 build_jvm_flags(token);
1013 }
1014 fclose(stream);
1015 return result;
1016 }
1017
1018 //=============================================================================================================
1019 // Parsing of properties (-D)
1020
1021 const char* Arguments::get_property(const char* key) {
1022 return PropertyList_get_value(system_properties(), key);
1023 }
1024
1025 bool Arguments::add_property(const char* prop) {
1026 const char* eq = strchr(prop, '=');
1027 char* key;
1028 // ns must be static--its address may be stored in a SystemProperty object.
1029 const static char ns[1] = {0};
1030 char* value = (char *)ns;
1031
1032 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1033 key = AllocateHeap(key_len + 1, mtInternal);
1034 strncpy(key, prop, key_len);
1035 key[key_len] = '\0';
1036
1037 if (eq != NULL) {
1038 size_t value_len = strlen(prop) - key_len - 1;
1039 value = AllocateHeap(value_len + 1, mtInternal);
1040 strncpy(value, &prop[key_len + 1], value_len + 1);
1041 }
1042
1043 if (strcmp(key, "java.compiler") == 0) {
1044 process_java_compiler_argument(value);
1045 FreeHeap(key);
1046 if (eq != NULL) {
1047 FreeHeap(value);
1048 }
1049 return true;
1050 } else if (strcmp(key, "sun.java.command") == 0) {
1051 _java_command = value;
1052
1053 // Record value in Arguments, but let it get passed to Java.
1054 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1055 // launcher.pid property is private and is processed
1056 // in process_sun_java_launcher_properties();
1057 // the sun.java.launcher property is passed on to the java application
1058 FreeHeap(key);
1059 if (eq != NULL) {
1060 FreeHeap(value);
1061 }
1062 return true;
1063 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1064 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1065 // its value without going through the property list or making a Java call.
1066 _java_vendor_url_bug = value;
1067 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1068 PropertyList_unique_add(&_system_properties, key, value, true);
1069 return true;
1070 }
1071 // Create new property and add at the end of the list
1072 PropertyList_unique_add(&_system_properties, key, value);
1073 return true;
1074 }
1075
1076 //===========================================================================================================
1077 // Setting int/mixed/comp mode flags
1078
1079 void Arguments::set_mode_flags(Mode mode) {
1080 // Set up default values for all flags.
1081 // If you add a flag to any of the branches below,
1082 // add a default value for it here.
1083 set_java_compiler(false);
1084 _mode = mode;
1085
1086 // Ensure Agent_OnLoad has the correct initial values.
1087 // This may not be the final mode; mode may change later in onload phase.
1088 PropertyList_unique_add(&_system_properties, "java.vm.info",
1089 (char*)VM_Version::vm_info_string(), false);
1090
1091 UseInterpreter = true;
1092 UseCompiler = true;
1093 UseLoopCounter = true;
1094
1095 #ifndef ZERO
1096 // Turn these off for mixed and comp. Leave them on for Zero.
1097 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1098 UseFastAccessorMethods = (mode == _int);
1099 }
1100 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1101 UseFastEmptyMethods = (mode == _int);
1102 }
1103 #endif
1104
1105 // Default values may be platform/compiler dependent -
1106 // use the saved values
1107 ClipInlining = Arguments::_ClipInlining;
1108 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1109 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1110 BackgroundCompilation = Arguments::_BackgroundCompilation;
1111
1112 // Change from defaults based on mode
1113 switch (mode) {
1114 default:
1115 ShouldNotReachHere();
1116 break;
1117 case _int:
1118 UseCompiler = false;
1119 UseLoopCounter = false;
1120 AlwaysCompileLoopMethods = false;
1121 UseOnStackReplacement = false;
1122 break;
1123 case _mixed:
1124 // same as default
1125 break;
1126 case _comp:
1127 UseInterpreter = false;
1128 BackgroundCompilation = false;
1129 ClipInlining = false;
1130 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1131 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1132 // compile a level 4 (C2) and then continue executing it.
1133 if (TieredCompilation) {
1134 Tier3InvokeNotifyFreqLog = 0;
1135 Tier4InvocationThreshold = 0;
1136 }
1137 break;
1138 }
1139 }
1140
1141 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1142 // Conflict: required to use shared spaces (-Xshare:on), but
1143 // incompatible command line options were chosen.
1144
1145 static void no_shared_spaces(const char* message) {
1146 if (RequireSharedSpaces) {
1147 jio_fprintf(defaultStream::error_stream(),
1148 "Class data sharing is inconsistent with other specified options.\n");
1149 vm_exit_during_initialization("Unable to use shared archive.", message);
1150 } else {
1151 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1152 }
1153 }
1154 #endif
1155
1156 void Arguments::set_tiered_flags() {
1157 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1158 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1159 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1160 }
1161 if (CompilationPolicyChoice < 2) {
1162 vm_exit_during_initialization(
1163 "Incompatible compilation policy selected", NULL);
1164 }
1165 // Increase the code cache size - tiered compiles a lot more.
1166 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1167 #ifndef AARCH64
1168 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1169 #else
1170 FLAG_SET_DEFAULT(ReservedCodeCacheSize,
1171 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1172 #endif
1173 }
1174 if (!UseInterpreter) { // -Xcomp
1175 Tier3InvokeNotifyFreqLog = 0;
1176 Tier4InvocationThreshold = 0;
1177 }
1178 }
1179
1180 /**
1181 * Returns the minimum number of compiler threads needed to run the JVM. The following
1182 * configurations are possible.
1183 *
1184 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1185 * compiler threads is 0.
1186 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1187 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1188 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1189 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1190 * C1 can be used, so the minimum number of compiler threads is 1.
1191 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1192 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1193 * the minimum number of compiler threads is 2.
1194 */
1195 int Arguments::get_min_number_of_compiler_threads() {
1196 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1197 return 0; // case 1
1198 #else
1199 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1200 return 1; // case 2 or case 3
1201 }
1202 return 2; // case 4 (tiered)
1203 #endif
1204 }
1205
1206 #if INCLUDE_ALL_GCS
1207 static void disable_adaptive_size_policy(const char* collector_name) {
1208 if (UseAdaptiveSizePolicy) {
1209 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1210 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1211 collector_name);
1212 }
1213 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1214 }
1215 }
1216
1217 void Arguments::set_parnew_gc_flags() {
1218 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1219 "control point invariant");
1220 assert(UseParNewGC, "Error");
1221
1222 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1223 disable_adaptive_size_policy("UseParNewGC");
1224
1225 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1226 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1227 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1228 } else if (ParallelGCThreads == 0) {
1229 jio_fprintf(defaultStream::error_stream(),
1230 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1231 vm_exit(1);
1232 }
1233
1234 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1235 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1236 // we set them to 1024 and 1024.
1237 // See CR 6362902.
1238 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1239 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1240 }
1241 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1242 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1243 }
1244
1245 // AlwaysTenure flag should make ParNew promote all at first collection.
1246 // See CR 6362902.
1247 if (AlwaysTenure) {
1248 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1249 }
1250 // When using compressed oops, we use local overflow stacks,
1251 // rather than using a global overflow list chained through
1252 // the klass word of the object's pre-image.
1253 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1254 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1255 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1256 }
1257 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1258 }
1259 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1260 }
1261
1262 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1263 // sparc/solaris for certain applications, but would gain from
1264 // further optimization and tuning efforts, and would almost
1265 // certainly gain from analysis of platform and environment.
1266 void Arguments::set_cms_and_parnew_gc_flags() {
1267 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1268 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1269
1270 // If we are using CMS, we prefer to UseParNewGC,
1271 // unless explicitly forbidden.
1272 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1273 FLAG_SET_ERGO(bool, UseParNewGC, true);
1274 }
1275
1276 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1277 disable_adaptive_size_policy("UseConcMarkSweepGC");
1278
1279 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1280 // as needed.
1281 if (UseParNewGC) {
1282 set_parnew_gc_flags();
1283 }
1284
1285 size_t max_heap = align_size_down(MaxHeapSize,
1286 CardTableRS::ct_max_alignment_constraint());
1287
1288 // Now make adjustments for CMS
1289 intx tenuring_default = (intx)6;
1290 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1291
1292 // Preferred young gen size for "short" pauses:
1293 // upper bound depends on # of threads and NewRatio.
1294 const uintx parallel_gc_threads =
1295 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1296 const size_t preferred_max_new_size_unaligned =
1297 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1298 size_t preferred_max_new_size =
1299 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1300
1301 // Unless explicitly requested otherwise, size young gen
1302 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1303
1304 // If either MaxNewSize or NewRatio is set on the command line,
1305 // assume the user is trying to set the size of the young gen.
1306 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1307
1308 // Set MaxNewSize to our calculated preferred_max_new_size unless
1309 // NewSize was set on the command line and it is larger than
1310 // preferred_max_new_size.
1311 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1312 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1313 } else {
1314 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1315 }
1316 if (PrintGCDetails && Verbose) {
1317 // Too early to use gclog_or_tty
1318 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1319 }
1320
1321 // Code along this path potentially sets NewSize and OldSize
1322 if (PrintGCDetails && Verbose) {
1323 // Too early to use gclog_or_tty
1324 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1325 " initial_heap_size: " SIZE_FORMAT
1326 " max_heap: " SIZE_FORMAT,
1327 min_heap_size(), InitialHeapSize, max_heap);
1328 }
1329 size_t min_new = preferred_max_new_size;
1330 if (FLAG_IS_CMDLINE(NewSize)) {
1331 min_new = NewSize;
1332 }
1333 if (max_heap > min_new && min_heap_size() > min_new) {
1334 // Unless explicitly requested otherwise, make young gen
1335 // at least min_new, and at most preferred_max_new_size.
1336 if (FLAG_IS_DEFAULT(NewSize)) {
1337 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1338 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1339 if (PrintGCDetails && Verbose) {
1340 // Too early to use gclog_or_tty
1341 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1342 }
1343 }
1344 // Unless explicitly requested otherwise, size old gen
1345 // so it's NewRatio x of NewSize.
1346 if (FLAG_IS_DEFAULT(OldSize)) {
1347 if (max_heap > NewSize) {
1348 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1349 if (PrintGCDetails && Verbose) {
1350 // Too early to use gclog_or_tty
1351 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1352 }
1353 }
1354 }
1355 }
1356 }
1357 // Unless explicitly requested otherwise, definitely
1358 // promote all objects surviving "tenuring_default" scavenges.
1359 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1360 FLAG_IS_DEFAULT(SurvivorRatio)) {
1361 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1362 }
1363 // If we decided above (or user explicitly requested)
1364 // `promote all' (via MaxTenuringThreshold := 0),
1365 // prefer minuscule survivor spaces so as not to waste
1366 // space for (non-existent) survivors
1367 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1368 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1369 }
1370 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1371 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1372 // This is done in order to make ParNew+CMS configuration to work
1373 // with YoungPLABSize and OldPLABSize options.
1374 // See CR 6362902.
1375 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1376 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1377 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1378 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1379 // the value (either from the command line or ergonomics) of
1380 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1381 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1382 } else {
1383 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1384 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1385 // we'll let it to take precedence.
1386 jio_fprintf(defaultStream::error_stream(),
1387 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1388 " options are specified for the CMS collector."
1389 " CMSParPromoteBlocksToClaim will take precedence.\n");
1390 }
1391 }
1392 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1393 // OldPLAB sizing manually turned off: Use a larger default setting,
1394 // unless it was manually specified. This is because a too-low value
1395 // will slow down scavenges.
1396 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1397 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1398 }
1399 }
1400 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1401 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1402 // If either of the static initialization defaults have changed, note this
1403 // modification.
1404 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1405 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1406 }
1407
1408 if (PrintGCDetails && Verbose) {
1409 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1410 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1411 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1412 }
1413 }
1414 #endif // INCLUDE_ALL_GCS
1415
1416 void set_object_alignment() {
1417 // Object alignment.
1418 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1419 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1420 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1421 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1422 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1423 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1424
1425 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1426 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1427
1428 // Oop encoding heap max
1429 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1430
1431 #if INCLUDE_ALL_GCS
1432 // Set CMS global values
1433 CompactibleFreeListSpace::set_cms_values();
1434 #endif // INCLUDE_ALL_GCS
1435 }
1436
1437 bool verify_object_alignment() {
1438 // Object alignment.
1439 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1440 jio_fprintf(defaultStream::error_stream(),
1441 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1442 (int)ObjectAlignmentInBytes);
1443 return false;
1444 }
1445 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1446 jio_fprintf(defaultStream::error_stream(),
1447 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1448 (int)ObjectAlignmentInBytes, BytesPerLong);
1449 return false;
1450 }
1451 // It does not make sense to have big object alignment
1452 // since a space lost due to alignment will be greater
1453 // then a saved space from compressed oops.
1454 if ((int)ObjectAlignmentInBytes > 256) {
1455 jio_fprintf(defaultStream::error_stream(),
1456 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1457 (int)ObjectAlignmentInBytes);
1458 return false;
1459 }
1460 // In case page size is very small.
1461 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1462 jio_fprintf(defaultStream::error_stream(),
1463 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1464 (int)ObjectAlignmentInBytes, os::vm_page_size());
1465 return false;
1466 }
1467 if(SurvivorAlignmentInBytes == 0) {
1468 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1469 } else {
1470 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1471 jio_fprintf(defaultStream::error_stream(),
1472 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1473 (int)SurvivorAlignmentInBytes);
1474 return false;
1475 }
1476 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1477 jio_fprintf(defaultStream::error_stream(),
1478 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1479 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1480 return false;
1481 }
1482 }
1483 return true;
1484 }
1485
1486 size_t Arguments::max_heap_for_compressed_oops() {
1487 // Avoid sign flip.
1488 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1489 // We need to fit both the NULL page and the heap into the memory budget, while
1490 // keeping alignment constraints of the heap. To guarantee the latter, as the
1491 // NULL page is located before the heap, we pad the NULL page to the conservative
1492 // maximum alignment that the GC may ever impose upon the heap.
1493 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1494 _conservative_max_heap_alignment);
1495
1496 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1497 NOT_LP64(ShouldNotReachHere(); return 0);
1498 }
1499
1500 bool Arguments::should_auto_select_low_pause_collector() {
1501 if (UseAutoGCSelectPolicy &&
1502 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1503 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1504 if (PrintGCDetails) {
1505 // Cannot use gclog_or_tty yet.
1506 tty->print_cr("Automatic selection of the low pause collector"
1507 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1508 }
1509 return true;
1510 }
1511 return false;
1512 }
1513
1514 void Arguments::set_use_compressed_oops() {
1515 #ifndef ZERO
1516 #ifdef _LP64
1517 // MaxHeapSize is not set up properly at this point, but
1518 // the only value that can override MaxHeapSize if we are
1519 // to use UseCompressedOops is InitialHeapSize.
1520 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1521
1522 if (max_heap_size <= max_heap_for_compressed_oops()) {
1523 #if !defined(COMPILER1) || defined(TIERED)
1524 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1525 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1526 }
1527 #endif
1528 #ifdef _WIN64
1529 if (UseLargePages && UseCompressedOops) {
1530 // Cannot allocate guard pages for implicit checks in indexed addressing
1531 // mode, when large pages are specified on windows.
1532 // This flag could be switched ON if narrow oop base address is set to 0,
1533 // see code in Universe::initialize_heap().
1534 Universe::set_narrow_oop_use_implicit_null_checks(false);
1535 }
1536 #endif // _WIN64
1537 } else {
1538 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1539 warning("Max heap size too large for Compressed Oops");
1540 FLAG_SET_DEFAULT(UseCompressedOops, false);
1541 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1542 }
1543 }
1544 #endif // _LP64
1545 #endif // ZERO
1546 }
1547
1548 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1549 // set_use_compressed_oops().
1550 void Arguments::set_use_compressed_klass_ptrs() {
1551 #ifndef ZERO
1552 #ifdef _LP64
1553 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1554 if (!UseCompressedOops) {
1555 if (UseCompressedClassPointers) {
1556 warning("UseCompressedClassPointers requires UseCompressedOops");
1557 }
1558 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1559 } else {
1560 // Turn on UseCompressedClassPointers too
1561 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1562 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1563 }
1564 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1565 if (UseCompressedClassPointers) {
1566 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1567 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1568 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1569 }
1570 }
1571 }
1572 #endif // _LP64
1573 #endif // !ZERO
1574 }
1575
1576 void Arguments::set_conservative_max_heap_alignment() {
1577 // The conservative maximum required alignment for the heap is the maximum of
1578 // the alignments imposed by several sources: any requirements from the heap
1579 // itself, the collector policy and the maximum page size we may run the VM
1580 // with.
1581 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1582 #if INCLUDE_ALL_GCS
1583 if (UseParallelGC) {
1584 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1585 } else if (UseG1GC) {
1586 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1587 } else if (UseShenandoahGC) {
1588 heap_alignment = ShenandoahHeap::conservative_max_heap_alignment();
1589 }
1590 #endif // INCLUDE_ALL_GCS
1591 _conservative_max_heap_alignment = MAX4(heap_alignment,
1592 (size_t)os::vm_allocation_granularity(),
1593 os::max_page_size(),
1594 CollectorPolicy::compute_heap_alignment());
1595 }
1596
1597 void Arguments::select_gc_ergonomically() {
1598 if (os::is_server_class_machine()) {
1599 if (should_auto_select_low_pause_collector()) {
1600 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1601 } else {
1602 FLAG_SET_ERGO(bool, UseParallelGC, true);
1603 }
1604 }
1605 }
1606
1607 void Arguments::select_gc() {
1608 if (!gc_selected()) {
1609 select_gc_ergonomically();
1610 }
1611 }
1612
1613 void Arguments::set_ergonomics_flags() {
1614 select_gc();
1615
1616 #ifdef COMPILER2
1617 // Shared spaces work fine with other GCs but causes bytecode rewriting
1618 // to be disabled, which hurts interpreter performance and decreases
1619 // server performance. When -server is specified, keep the default off
1620 // unless it is asked for. Future work: either add bytecode rewriting
1621 // at link time, or rewrite bytecodes in non-shared methods.
1622 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1623 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1624 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1625 }
1626 #endif
1627
1628 set_conservative_max_heap_alignment();
1629
1630 #ifndef ZERO
1631 #ifdef _LP64
1632 set_use_compressed_oops();
1633
1634 // set_use_compressed_klass_ptrs() must be called after calling
1635 // set_use_compressed_oops().
1636 set_use_compressed_klass_ptrs();
1637
1638 // Also checks that certain machines are slower with compressed oops
1639 // in vm_version initialization code.
1640 #endif // _LP64
1641 #endif // !ZERO
1642 }
1643
1644 void Arguments::set_parallel_gc_flags() {
1645 assert(UseParallelGC || UseParallelOldGC, "Error");
1646 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1647 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1648 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1649 }
1650 FLAG_SET_DEFAULT(UseParallelGC, true);
1651
1652 // If no heap maximum was requested explicitly, use some reasonable fraction
1653 // of the physical memory, up to a maximum of 1GB.
1654 FLAG_SET_DEFAULT(ParallelGCThreads,
1655 Abstract_VM_Version::parallel_worker_threads());
1656 if (ParallelGCThreads == 0) {
1657 jio_fprintf(defaultStream::error_stream(),
1658 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1659 vm_exit(1);
1660 }
1661
1662 if (UseAdaptiveSizePolicy) {
1663 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1664 // unless the user actually sets these flags.
1665 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1666 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1667 _min_heap_free_ratio = MinHeapFreeRatio;
1668 }
1669 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1670 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1671 _max_heap_free_ratio = MaxHeapFreeRatio;
1672 }
1673 }
1674
1675 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1676 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1677 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1678 // See CR 6362902 for details.
1679 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1680 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1681 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1682 }
1683 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1684 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1685 }
1686 }
1687
1688 if (UseParallelOldGC) {
1689 // Par compact uses lower default values since they are treated as
1690 // minimums. These are different defaults because of the different
1691 // interpretation and are not ergonomically set.
1692 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1693 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1694 }
1695 }
1696 }
1697
1698 void Arguments::set_g1_gc_flags() {
1699 assert(UseG1GC, "Error");
1700 #ifdef COMPILER1
1701 FastTLABRefill = false;
1702 #endif
1703 FLAG_SET_DEFAULT(ParallelGCThreads,
1704 Abstract_VM_Version::parallel_worker_threads());
1705 if (ParallelGCThreads == 0) {
1706 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1707 }
1708
1709 #if INCLUDE_ALL_GCS
1710 if (G1ConcRefinementThreads == 0) {
1711 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1712 }
1713 #endif
1714
1715 // MarkStackSize will be set (if it hasn't been set by the user)
1716 // when concurrent marking is initialized.
1717 // Its value will be based upon the number of parallel marking threads.
1718 // But we do set the maximum mark stack size here.
1719 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1720 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1721 }
1722
1723 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1724 // In G1, we want the default GC overhead goal to be higher than
1725 // say in PS. So we set it here to 10%. Otherwise the heap might
1726 // be expanded more aggressively than we would like it to. In
1727 // fact, even 10% seems to not be high enough in some cases
1728 // (especially small GC stress tests that the main thing they do
1729 // is allocation). We might consider increase it further.
1730 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1731 }
1732
1733 if (PrintGCDetails && Verbose) {
1734 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1735 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1736 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1737 }
1738 }
1739
1740 void Arguments::set_shenandoah_gc_flags() {
1741
1742 #if !(defined AARCH64 || defined AMD64 || defined IA32)
1743 UNSUPPORTED_GC_OPTION(UseShenandoahGC);
1744 #endif
1745
1746 #if 0 // leave this block as stepping stone for future platforms
1747 warning("Shenandoah GC is not fully supported on this platform:");
1748 warning(" concurrent modes are not supported, only STW cycles are enabled;");
1749 warning(" arch-specific barrier code is not implemented, disabling barriers;");
1750
1751 #if INCLUDE_ALL_GCS
1752 FLAG_SET_DEFAULT(ShenandoahGCHeuristics, "passive");
1753
1754 FLAG_SET_DEFAULT(ShenandoahSATBBarrier, false);
1755 FLAG_SET_DEFAULT(ShenandoahLoadRefBarrier, false);
1756 FLAG_SET_DEFAULT(ShenandoahStoreValEnqueueBarrier, false);
1757 FLAG_SET_DEFAULT(ShenandoahCASBarrier, false);
1758 FLAG_SET_DEFAULT(ShenandoahCloneBarrier, false);
1759
1760 FLAG_SET_DEFAULT(ShenandoahVerifyOptoBarriers, false);
1761 #endif
1762 #endif
1763
1764 #if INCLUDE_ALL_GCS
1765 if (!FLAG_IS_DEFAULT(ShenandoahGarbageThreshold)) {
1766 if (0 > ShenandoahGarbageThreshold || ShenandoahGarbageThreshold > 100) {
1767 vm_exit_during_initialization("The flag -XX:ShenandoahGarbageThreshold is out of range", NULL);
1768 }
1769 }
1770
1771 if (!FLAG_IS_DEFAULT(ShenandoahAllocationThreshold)) {
1772 if (0 > ShenandoahAllocationThreshold || ShenandoahAllocationThreshold > 100) {
1773 vm_exit_during_initialization("The flag -XX:ShenandoahAllocationThreshold is out of range", NULL);
1774 }
1775 }
1776
1777 if (!FLAG_IS_DEFAULT(ShenandoahMinFreeThreshold)) {
1778 if (0 > ShenandoahMinFreeThreshold || ShenandoahMinFreeThreshold > 100) {
1779 vm_exit_during_initialization("The flag -XX:ShenandoahMinFreeThreshold is out of range", NULL);
1780 }
1781 }
1782 #endif
1783
1784 #if INCLUDE_ALL_GCS
1785 if (UseLargePages && (MaxHeapSize / os::large_page_size()) < ShenandoahHeapRegion::MIN_NUM_REGIONS) {
1786 warning("Large pages size (" SIZE_FORMAT "K) is too large to afford page-sized regions, disabling uncommit",
1787 os::large_page_size() / K);
1788 FLAG_SET_DEFAULT(ShenandoahUncommit, false);
1789 }
1790 #endif
1791
1792 // Enable NUMA by default. While Shenandoah is not NUMA-aware, enabling NUMA makes
1793 // storage allocation code NUMA-aware.
1794 if (FLAG_IS_DEFAULT(UseNUMA)) {
1795 FLAG_SET_DEFAULT(UseNUMA, true);
1796 }
1797
1798 // Set up default number of concurrent threads. We want to have cycles complete fast
1799 // enough, but we also do not want to steal too much CPU from the concurrently running
1800 // application. Using 1/4 of available threads for concurrent GC seems a good
1801 // compromise here.
1802 bool ergo_conc = FLAG_IS_DEFAULT(ConcGCThreads);
1803 if (ergo_conc) {
1804 FLAG_SET_DEFAULT(ConcGCThreads, MAX2(1, os::initial_active_processor_count() / 4));
1805 }
1806
1807 if (ConcGCThreads == 0) {
1808 vm_exit_during_initialization("Shenandoah expects ConcGCThreads > 0, check -XX:ConcGCThreads=#");
1809 }
1810
1811 // Set up default number of parallel threads. We want to have decent pauses performance
1812 // which would use parallel threads, but we also do not want to do too many threads
1813 // that will overwhelm the OS scheduler. Using 1/2 of available threads seems to be a fair
1814 // compromise here. Due to implementation constraints, it should not be lower than
1815 // the number of concurrent threads.
1816 bool ergo_parallel = FLAG_IS_DEFAULT(ParallelGCThreads);
1817 if (ergo_parallel) {
1818 FLAG_SET_DEFAULT(ParallelGCThreads, MAX2(1, os::initial_active_processor_count() / 2));
1819 }
1820
1821 if (ParallelGCThreads == 0) {
1822 vm_exit_during_initialization("Shenandoah expects ParallelGCThreads > 0, check -XX:ParallelGCThreads=#");
1823 }
1824
1825 // Make sure ergonomic decisions do not break the thread count invariants.
1826 // This may happen when user overrides one of the flags, but not the other.
1827 // When that happens, we want to adjust the setting that was set ergonomically.
1828 if (ParallelGCThreads < ConcGCThreads) {
1829 if (ergo_conc && !ergo_parallel) {
1830 FLAG_SET_DEFAULT(ConcGCThreads, ParallelGCThreads);
1831 } else if (!ergo_conc && ergo_parallel) {
1832 FLAG_SET_DEFAULT(ParallelGCThreads, ConcGCThreads);
1833 } else if (ergo_conc && ergo_parallel) {
1834 // Should not happen, check the ergonomic computation above. Fail with relevant error.
1835 vm_exit_during_initialization("Shenandoah thread count ergonomic error");
1836 } else {
1837 // User settings error, report and ask user to rectify.
1838 vm_exit_during_initialization("Shenandoah expects ConcGCThreads <= ParallelGCThreads, check -XX:ParallelGCThreads, -XX:ConcGCThreads");
1839 }
1840 }
1841
1842 if (FLAG_IS_DEFAULT(ParallelRefProcEnabled)) {
1843 FLAG_SET_DEFAULT(ParallelRefProcEnabled, true);
1844 }
1845
1846 #if INCLUDE_ALL_GCS
1847 if (ShenandoahRegionSampling && FLAG_IS_DEFAULT(PerfDataMemorySize)) {
1848 // When sampling is enabled, max out the PerfData memory to get more
1849 // Shenandoah data in, including Matrix.
1850 FLAG_SET_DEFAULT(PerfDataMemorySize, 2048*K);
1851 }
1852 #endif
1853
1854 #ifdef COMPILER2
1855 // Shenandoah cares more about pause times, rather than raw throughput.
1856 // Enabling safepoints in counted loops makes it more responsive with
1857 // long loops. However, it is risky in 8u, due to bugs it brings, for
1858 // example JDK-8176506. Warn user about this, and proceed.
1859 if (UseCountedLoopSafepoints) {
1860 warning("Enabling -XX:UseCountedLoopSafepoints is known to cause JVM bugs. Use at your own risk.");
1861 }
1862
1863 #ifdef ASSERT
1864 // C2 barrier verification is only reliable when all default barriers are enabled
1865 if (ShenandoahVerifyOptoBarriers &&
1866 (!FLAG_IS_DEFAULT(ShenandoahSATBBarrier) ||
1867 !FLAG_IS_DEFAULT(ShenandoahLoadRefBarrier) ||
1868 !FLAG_IS_DEFAULT(ShenandoahStoreValEnqueueBarrier) ||
1869 !FLAG_IS_DEFAULT(ShenandoahCASBarrier) ||
1870 !FLAG_IS_DEFAULT(ShenandoahCloneBarrier)
1871 )) {
1872 warning("Unusual barrier configuration, disabling C2 barrier verification");
1873 FLAG_SET_DEFAULT(ShenandoahVerifyOptoBarriers, false);
1874 }
1875 #else
1876 guarantee(!ShenandoahVerifyOptoBarriers, "Should be disabled");
1877 #endif // ASSERT
1878 #endif // COMPILER2
1879
1880 #if INCLUDE_ALL_GCS
1881 if ((InitialHeapSize == MaxHeapSize) && ShenandoahUncommit) {
1882 if (PrintGC) {
1883 tty->print_cr("Min heap equals to max heap, disabling ShenandoahUncommit");
1884 }
1885 FLAG_SET_DEFAULT(ShenandoahUncommit, false);
1886 }
1887
1888 // If class unloading is disabled, no unloading for concurrent cycles as well.
1889 if (!ClassUnloading) {
1890 FLAG_SET_DEFAULT(ClassUnloadingWithConcurrentMark, false);
1891 }
1892
1893 // TLAB sizing policy makes resizing decisions before each GC cycle. It averages
1894 // historical data, assigning more recent data the weight according to TLABAllocationWeight.
1895 // Current default is good for generational collectors that run frequent young GCs.
1896 // With Shenandoah, GC cycles are much less frequent, so we need we need sizing policy
1897 // to converge faster over smaller number of resizing decisions.
1898 if (FLAG_IS_DEFAULT(TLABAllocationWeight)) {
1899 FLAG_SET_DEFAULT(TLABAllocationWeight, 90);
1900 }
1901
1902 if (FLAG_IS_DEFAULT(ShenandoahSoftMaxHeapSize)) {
1903 FLAG_SET_DEFAULT(ShenandoahSoftMaxHeapSize, MaxHeapSize);
1904 } else {
1905 if (ShenandoahSoftMaxHeapSize > MaxHeapSize) {
1906 vm_exit_during_initialization("ShenandoahSoftMaxHeapSize must be less than or equal to the maximum heap size\n");
1907 }
1908 }
1909 #endif
1910 }
1911
1912 #if !INCLUDE_ALL_GCS
1913 #ifdef ASSERT
1914 static bool verify_serial_gc_flags() {
1915 return (UseSerialGC &&
1916 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1917 UseParallelGC || UseParallelOldGC));
1918 }
1919 #endif // ASSERT
1920 #endif // INCLUDE_ALL_GCS
1921
1922 void Arguments::set_gc_specific_flags() {
1923 #if INCLUDE_ALL_GCS
1924 // Set per-collector flags
1925 if (UseParallelGC || UseParallelOldGC) {
1926 set_parallel_gc_flags();
1927 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1928 set_cms_and_parnew_gc_flags();
1929 } else if (UseParNewGC) { // Skipped if CMS is set above
1930 set_parnew_gc_flags();
1931 } else if (UseG1GC) {
1932 set_g1_gc_flags();
1933 } else if (UseShenandoahGC) {
1934 set_shenandoah_gc_flags();
1935 }
1936 check_deprecated_gcs();
1937 check_deprecated_gc_flags();
1938 if (AssumeMP && !UseSerialGC) {
1939 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1940 warning("If the number of processors is expected to increase from one, then"
1941 " you should configure the number of parallel GC threads appropriately"
1942 " using -XX:ParallelGCThreads=N");
1943 }
1944 }
1945 if (MinHeapFreeRatio == 100) {
1946 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1947 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1948 }
1949
1950 // If class unloading is disabled, also disable concurrent class unloading.
1951 if (!ClassUnloading) {
1952 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1953 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
1954 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1955 FLAG_SET_CMDLINE(uintx, ShenandoahUnloadClassesFrequency, 0);
1956 }
1957 #else // INCLUDE_ALL_GCS
1958 assert(verify_serial_gc_flags(), "SerialGC unset");
1959 #endif // INCLUDE_ALL_GCS
1960 }
1961
1962 julong Arguments::limit_by_allocatable_memory(julong limit) {
1963 julong max_allocatable;
1964 julong result = limit;
1965 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1966 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1967 }
1968 return result;
1969 }
1970
1971 void Arguments::set_heap_size() {
1972 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1973 // Deprecated flag
1974 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1975 }
1976
1977 julong phys_mem =
1978 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1979 : (julong)MaxRAM;
1980
1981 // Experimental support for CGroup memory limits
1982 if (UseCGroupMemoryLimitForHeap) {
1983 // This is a rough indicator that a CGroup limit may be in force
1984 // for this process
1985 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1986 FILE *fp = fopen(lim_file, "r");
1987 if (fp != NULL) {
1988 julong cgroup_max = 0;
1989 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
1990 if (ret == 1 && cgroup_max > 0) {
1991 // If unlimited, cgroup_max will be a very large, but unspecified
1992 // value, so use initial phys_mem as a limit
1993 if (PrintGCDetails && Verbose) {
1994 // Cannot use gclog_or_tty yet.
1995 tty->print_cr("Setting phys_mem to the min of cgroup limit ("
1996 JULONG_FORMAT "MB) and initial phys_mem ("
1997 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
1998 }
1999 phys_mem = MIN2(cgroup_max, phys_mem);
2000 } else {
2001 warning("Unable to read/parse cgroup memory limit from %s: %s",
2002 lim_file, errno != 0 ? strerror(errno) : "unknown error");
2003 }
2004 fclose(fp);
2005 } else {
2006 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
2007 }
2008 }
2009
2010 // Convert Fraction to Precentage values
2011 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
2012 !FLAG_IS_DEFAULT(MaxRAMFraction))
2013 MaxRAMPercentage = 100.0 / MaxRAMFraction;
2014
2015 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
2016 !FLAG_IS_DEFAULT(MinRAMFraction))
2017 MinRAMPercentage = 100.0 / MinRAMFraction;
2018
2019 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
2020 !FLAG_IS_DEFAULT(InitialRAMFraction))
2021 InitialRAMPercentage = 100.0 / InitialRAMFraction;
2022
2023 // If the maximum heap size has not been set with -Xmx,
2024 // then set it as fraction of the size of physical memory,
2025 // respecting the maximum and minimum sizes of the heap.
2026 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2027 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
2028 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
2029 if (reasonable_min < MaxHeapSize) {
2030 // Small physical memory, so use a minimum fraction of it for the heap
2031 reasonable_max = reasonable_min;
2032 } else {
2033 // Not-small physical memory, so require a heap at least
2034 // as large as MaxHeapSize
2035 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2036 }
2037
2038 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2039 // Limit the heap size to ErgoHeapSizeLimit
2040 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2041 }
2042 if (UseCompressedOops) {
2043 // Limit the heap size to the maximum possible when using compressed oops
2044 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2045 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2046 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2047 // but it should be not less than default MaxHeapSize.
2048 max_coop_heap -= HeapBaseMinAddress;
2049 }
2050 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2051 }
2052 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2053
2054 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2055 // An initial heap size was specified on the command line,
2056 // so be sure that the maximum size is consistent. Done
2057 // after call to limit_by_allocatable_memory because that
2058 // method might reduce the allocation size.
2059 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2060 }
2061
2062 if (PrintGCDetails && Verbose) {
2063 // Cannot use gclog_or_tty yet.
2064 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2065 }
2066 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
2067 }
2068
2069 // If the minimum or initial heap_size have not been set or requested to be set
2070 // ergonomically, set them accordingly.
2071 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2072 julong reasonable_minimum = (julong)(OldSize + NewSize);
2073
2074 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2075
2076 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2077
2078 if (InitialHeapSize == 0) {
2079 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
2080
2081 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2082 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2083
2084 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2085
2086 if (PrintGCDetails && Verbose) {
2087 // Cannot use gclog_or_tty yet.
2088 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
2089 }
2090 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
2091 }
2092 // If the minimum heap size has not been set (via -Xms),
2093 // synchronize with InitialHeapSize to avoid errors with the default value.
2094 if (min_heap_size() == 0) {
2095 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
2096 if (PrintGCDetails && Verbose) {
2097 // Cannot use gclog_or_tty yet.
2098 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2099 }
2100 }
2101 }
2102 }
2103
2104 // This option inspects the machine and attempts to set various
2105 // parameters to be optimal for long-running, memory allocation
2106 // intensive jobs. It is intended for machines with large
2107 // amounts of cpu and memory.
2108 jint Arguments::set_aggressive_heap_flags() {
2109 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2110 // VM, but we may not be able to represent the total physical memory
2111 // available (like having 8gb of memory on a box but using a 32bit VM).
2112 // Thus, we need to make sure we're using a julong for intermediate
2113 // calculations.
2114 julong initHeapSize;
2115 julong total_memory = os::physical_memory();
2116
2117 if (total_memory < (julong) 256 * M) {
2118 jio_fprintf(defaultStream::error_stream(),
2119 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2120 vm_exit(1);
2121 }
2122
2123 // The heap size is half of available memory, or (at most)
2124 // all of possible memory less 160mb (leaving room for the OS
2125 // when using ISM). This is the maximum; because adaptive sizing
2126 // is turned on below, the actual space used may be smaller.
2127
2128 initHeapSize = MIN2(total_memory / (julong) 2,
2129 total_memory - (julong) 160 * M);
2130
2131 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2132
2133 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2134 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2135 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2136 // Currently the minimum size and the initial heap sizes are the same.
2137 set_min_heap_size(initHeapSize);
2138 }
2139 if (FLAG_IS_DEFAULT(NewSize)) {
2140 // Make the young generation 3/8ths of the total heap.
2141 FLAG_SET_CMDLINE(uintx, NewSize,
2142 ((julong) MaxHeapSize / (julong) 8) * (julong) 3);
2143 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2144 }
2145
2146 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2147 FLAG_SET_DEFAULT(UseLargePages, true);
2148 #endif
2149
2150 // Increase some data structure sizes for efficiency
2151 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2152 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2153 FLAG_SET_CMDLINE(uintx, TLABSize, 256 * K);
2154
2155 // See the OldPLABSize comment below, but replace 'after promotion'
2156 // with 'after copying'. YoungPLABSize is the size of the survivor
2157 // space per-gc-thread buffers. The default is 4kw.
2158 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256 * K); // Note: this is in words
2159
2160 // OldPLABSize is the size of the buffers in the old gen that
2161 // UseParallelGC uses to promote live data that doesn't fit in the
2162 // survivor spaces. At any given time, there's one for each gc thread.
2163 // The default size is 1kw. These buffers are rarely used, since the
2164 // survivor spaces are usually big enough. For specjbb, however, there
2165 // are occasions when there's lots of live data in the young gen
2166 // and we end up promoting some of it. We don't have a definite
2167 // explanation for why bumping OldPLABSize helps, but the theory
2168 // is that a bigger PLAB results in retaining something like the
2169 // original allocation order after promotion, which improves mutator
2170 // locality. A minor effect may be that larger PLABs reduce the
2171 // number of PLAB allocation events during gc. The value of 8kw
2172 // was arrived at by experimenting with specjbb.
2173 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8 * K); // Note: this is in words
2174
2175 // Enable parallel GC and adaptive generation sizing
2176 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2177
2178 // Encourage steady state memory management
2179 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2180
2181 // This appears to improve mutator locality
2182 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2183
2184 // Get around early Solaris scheduling bug
2185 // (affinity vs other jobs on system)
2186 // but disallow DR and offlining (5008695).
2187 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2188
2189 return JNI_OK;
2190 }
2191
2192 // This must be called after ergonomics because we want bytecode rewriting
2193 // if the server compiler is used, or if UseSharedSpaces is disabled.
2194 void Arguments::set_bytecode_flags() {
2195 // Better not attempt to store into a read-only space.
2196 if (UseSharedSpaces) {
2197 FLAG_SET_DEFAULT(RewriteBytecodes, false);
2198 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2199 }
2200
2201 if (!RewriteBytecodes) {
2202 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2203 }
2204 }
2205
2206 // Aggressive optimization flags -XX:+AggressiveOpts
2207 void Arguments::set_aggressive_opts_flags() {
2208 #ifdef COMPILER2
2209 if (AggressiveUnboxing) {
2210 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2211 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2212 } else if (!EliminateAutoBox) {
2213 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2214 AggressiveUnboxing = false;
2215 }
2216 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2217 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2218 } else if (!DoEscapeAnalysis) {
2219 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2220 AggressiveUnboxing = false;
2221 }
2222 }
2223 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2224 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2225 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2226 }
2227 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2228 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2229 }
2230
2231 // Feed the cache size setting into the JDK
2232 char buffer[1024];
2233 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2234 add_property(buffer);
2235 }
2236 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2237 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2238 }
2239 #endif
2240
2241 if (AggressiveOpts) {
2242 // Sample flag setting code
2243 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2244 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2245 // }
2246 }
2247 }
2248
2249 //===========================================================================================================
2250 // Parsing of java.compiler property
2251
2252 void Arguments::process_java_compiler_argument(char* arg) {
2253 // For backwards compatibility, Djava.compiler=NONE or ""
2254 // causes us to switch to -Xint mode UNLESS -Xdebug
2255 // is also specified.
2256 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2257 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2258 }
2259 }
2260
2261 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2262 _sun_java_launcher = strdup(launcher);
2263 if (strcmp("gamma", _sun_java_launcher) == 0) {
2264 _created_by_gamma_launcher = true;
2265 }
2266 }
2267
2268 bool Arguments::created_by_java_launcher() {
2269 assert(_sun_java_launcher != NULL, "property must have value");
2270 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2271 }
2272
2273 bool Arguments::created_by_gamma_launcher() {
2274 return _created_by_gamma_launcher;
2275 }
2276
2277 //===========================================================================================================
2278 // Parsing of main arguments
2279
2280 bool Arguments::verify_interval(uintx val, uintx min,
2281 uintx max, const char* name) {
2282 // Returns true iff value is in the inclusive interval [min..max]
2283 // false, otherwise.
2284 if (val >= min && val <= max) {
2285 return true;
2286 }
2287 jio_fprintf(defaultStream::error_stream(),
2288 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
2289 " and " UINTX_FORMAT "\n",
2290 name, val, min, max);
2291 return false;
2292 }
2293
2294 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2295 // Returns true if given value is at least specified min threshold
2296 // false, otherwise.
2297 if (val >= min ) {
2298 return true;
2299 }
2300 jio_fprintf(defaultStream::error_stream(),
2301 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2302 name, val, min);
2303 return false;
2304 }
2305
2306 bool Arguments::verify_percentage(uintx value, const char* name) {
2307 if (is_percentage(value)) {
2308 return true;
2309 }
2310 jio_fprintf(defaultStream::error_stream(),
2311 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2312 name, value);
2313 return false;
2314 }
2315
2316 // check if do gclog rotation
2317 // +UseGCLogFileRotation is a must,
2318 // no gc log rotation when log file not supplied or
2319 // NumberOfGCLogFiles is 0
2320 void check_gclog_consistency() {
2321 if (UseGCLogFileRotation) {
2322 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2323 jio_fprintf(defaultStream::output_stream(),
2324 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2325 "where num_of_file > 0\n"
2326 "GC log rotation is turned off\n");
2327 UseGCLogFileRotation = false;
2328 }
2329 }
2330
2331 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2332 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2333 jio_fprintf(defaultStream::output_stream(),
2334 "GCLogFileSize changed to minimum 8K\n");
2335 }
2336
2337 // Record more information about previous cycles for improved debugging pleasure
2338 if (FLAG_IS_DEFAULT(LogEventsBufferEntries)) {
2339 FLAG_SET_DEFAULT(LogEventsBufferEntries, 250);
2340 }
2341 }
2342
2343 // This function is called for -Xloggc:<filename>, it can be used
2344 // to check if a given file name(or string) conforms to the following
2345 // specification:
2346 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2347 // %p and %t only allowed once. We only limit usage of filename not path
2348 bool is_filename_valid(const char *file_name) {
2349 const char* p = file_name;
2350 char file_sep = os::file_separator()[0];
2351 const char* cp;
2352 // skip prefix path
2353 for (cp = file_name; *cp != '\0'; cp++) {
2354 if (*cp == '/' || *cp == file_sep) {
2355 p = cp + 1;
2356 }
2357 }
2358
2359 int count_p = 0;
2360 int count_t = 0;
2361 while (*p != '\0') {
2362 if ((*p >= '0' && *p <= '9') ||
2363 (*p >= 'A' && *p <= 'Z') ||
2364 (*p >= 'a' && *p <= 'z') ||
2365 *p == '-' ||
2366 *p == '_' ||
2367 *p == '.') {
2368 p++;
2369 continue;
2370 }
2371 if (*p == '%') {
2372 if(*(p + 1) == 'p') {
2373 p += 2;
2374 count_p ++;
2375 continue;
2376 }
2377 if (*(p + 1) == 't') {
2378 p += 2;
2379 count_t ++;
2380 continue;
2381 }
2382 }
2383 return false;
2384 }
2385 return count_p < 2 && count_t < 2;
2386 }
2387
2388 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2389 if (!is_percentage(min_heap_free_ratio)) {
2390 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2391 return false;
2392 }
2393 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2394 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2395 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2396 MaxHeapFreeRatio);
2397 return false;
2398 }
2399 // This does not set the flag itself, but stores the value in a safe place for later usage.
2400 _min_heap_free_ratio = min_heap_free_ratio;
2401 return true;
2402 }
2403
2404 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2405 if (!is_percentage(max_heap_free_ratio)) {
2406 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2407 return false;
2408 }
2409 if (max_heap_free_ratio < MinHeapFreeRatio) {
2410 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2411 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2412 MinHeapFreeRatio);
2413 return false;
2414 }
2415 // This does not set the flag itself, but stores the value in a safe place for later usage.
2416 _max_heap_free_ratio = max_heap_free_ratio;
2417 return true;
2418 }
2419
2420 // Check consistency of GC selection
2421 bool Arguments::check_gc_consistency() {
2422 check_gclog_consistency();
2423 bool status = true;
2424 // Ensure that the user has not selected conflicting sets
2425 // of collectors. [Note: this check is merely a user convenience;
2426 // collectors over-ride each other so that only a non-conflicting
2427 // set is selected; however what the user gets is not what they
2428 // may have expected from the combination they asked for. It's
2429 // better to reduce user confusion by not allowing them to
2430 // select conflicting combinations.
2431 uint i = 0;
2432 if (UseSerialGC) i++;
2433 if (UseConcMarkSweepGC || UseParNewGC) i++;
2434 if (UseParallelGC || UseParallelOldGC) i++;
2435 if (UseG1GC) i++;
2436 if (UseShenandoahGC) i++;
2437 if (i > 1) {
2438 jio_fprintf(defaultStream::error_stream(),
2439 "Conflicting collector combinations in option list; "
2440 "please refer to the release notes for the combinations "
2441 "allowed\n");
2442 status = false;
2443 }
2444 return status;
2445 }
2446
2447 void Arguments::check_deprecated_gcs() {
2448 if (UseConcMarkSweepGC && !UseParNewGC) {
2449 warning("Using the DefNew young collector with the CMS collector is deprecated "
2450 "and will likely be removed in a future release");
2451 }
2452
2453 if (UseParNewGC && !UseConcMarkSweepGC) {
2454 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2455 // set up UseSerialGC properly, so that can't be used in the check here.
2456 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2457 "and will likely be removed in a future release");
2458 }
2459
2460 if (CMSIncrementalMode) {
2461 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2462 }
2463 }
2464
2465 void Arguments::check_deprecated_gc_flags() {
2466 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2467 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2468 "and will likely be removed in future release");
2469 }
2470 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2471 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2472 "Use MaxRAMFraction instead.");
2473 }
2474 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2475 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2476 }
2477 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2478 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2479 }
2480 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2481 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2482 }
2483 }
2484
2485 // Check stack pages settings
2486 bool Arguments::check_stack_pages()
2487 {
2488 bool status = true;
2489 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2490 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2491 // greater stack shadow pages can't generate instruction to bang stack
2492 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2493 return status;
2494 }
2495
2496 // Check the consistency of vm_init_args
2497 bool Arguments::check_vm_args_consistency() {
2498 // Method for adding checks for flag consistency.
2499 // The intent is to warn the user of all possible conflicts,
2500 // before returning an error.
2501 // Note: Needs platform-dependent factoring.
2502 bool status = true;
2503
2504 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2505 // builds so the cost of stack banging can be measured.
2506 #if (defined(PRODUCT) && defined(SOLARIS))
2507 if (!UseBoundThreads && !UseStackBanging) {
2508 jio_fprintf(defaultStream::error_stream(),
2509 "-UseStackBanging conflicts with -UseBoundThreads\n");
2510
2511 status = false;
2512 }
2513 #endif
2514
2515 if (TLABRefillWasteFraction == 0) {
2516 jio_fprintf(defaultStream::error_stream(),
2517 "TLABRefillWasteFraction should be a denominator, "
2518 "not " SIZE_FORMAT "\n",
2519 TLABRefillWasteFraction);
2520 status = false;
2521 }
2522
2523 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2524 "AdaptiveSizePolicyWeight");
2525 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2526
2527 // Divide by bucket size to prevent a large size from causing rollover when
2528 // calculating amount of memory needed to be allocated for the String table.
2529 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2530 (max_uintx / StringTable::bucket_size()), "StringTable size");
2531
2532 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2533 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2534
2535 {
2536 // Using "else if" below to avoid printing two error messages if min > max.
2537 // This will also prevent us from reporting both min>100 and max>100 at the
2538 // same time, but that is less annoying than printing two identical errors IMHO.
2539 FormatBuffer<80> err_msg("%s","");
2540 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2541 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2542 status = false;
2543 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2544 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2545 status = false;
2546 }
2547 }
2548
2549 // Min/MaxMetaspaceFreeRatio
2550 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2551 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2552
2553 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2554 jio_fprintf(defaultStream::error_stream(),
2555 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2556 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2557 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2558 MinMetaspaceFreeRatio,
2559 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2560 MaxMetaspaceFreeRatio);
2561 status = false;
2562 }
2563
2564 // Trying to keep 100% free is not practical
2565 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2566
2567 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2568 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2569 }
2570
2571 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2572 // Settings to encourage splitting.
2573 if (!FLAG_IS_CMDLINE(NewRatio)) {
2574 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2575 }
2576 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2577 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2578 }
2579 }
2580
2581 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2582 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2583 if (GCTimeLimit == 100) {
2584 // Turn off gc-overhead-limit-exceeded checks
2585 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2586 }
2587
2588 status = status && check_gc_consistency();
2589 status = status && check_stack_pages();
2590
2591 if (CMSIncrementalMode) {
2592 if (!UseConcMarkSweepGC) {
2593 jio_fprintf(defaultStream::error_stream(),
2594 "error: invalid argument combination.\n"
2595 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2596 "selected in order\nto use CMSIncrementalMode.\n");
2597 status = false;
2598 } else {
2599 status = status && verify_percentage(CMSIncrementalDutyCycle,
2600 "CMSIncrementalDutyCycle");
2601 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2602 "CMSIncrementalDutyCycleMin");
2603 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2604 "CMSIncrementalSafetyFactor");
2605 status = status && verify_percentage(CMSIncrementalOffset,
2606 "CMSIncrementalOffset");
2607 status = status && verify_percentage(CMSExpAvgFactor,
2608 "CMSExpAvgFactor");
2609 // If it was not set on the command line, set
2610 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2611 if (CMSInitiatingOccupancyFraction < 0) {
2612 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2613 }
2614 }
2615 }
2616
2617 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2618 // insists that we hold the requisite locks so that the iteration is
2619 // MT-safe. For the verification at start-up and shut-down, we don't
2620 // yet have a good way of acquiring and releasing these locks,
2621 // which are not visible at the CollectedHeap level. We want to
2622 // be able to acquire these locks and then do the iteration rather
2623 // than just disable the lock verification. This will be fixed under
2624 // bug 4788986.
2625 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2626 if (VerifyDuringStartup) {
2627 warning("Heap verification at start-up disabled "
2628 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2629 VerifyDuringStartup = false; // Disable verification at start-up
2630 }
2631
2632 if (VerifyBeforeExit) {
2633 warning("Heap verification at shutdown disabled "
2634 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2635 VerifyBeforeExit = false; // Disable verification at shutdown
2636 }
2637 }
2638
2639 // Note: only executed in non-PRODUCT mode
2640 if (!UseAsyncConcMarkSweepGC &&
2641 (ExplicitGCInvokesConcurrent ||
2642 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2643 jio_fprintf(defaultStream::error_stream(),
2644 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2645 " with -UseAsyncConcMarkSweepGC");
2646 status = false;
2647 }
2648
2649 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2650
2651 #if INCLUDE_ALL_GCS
2652 if (UseG1GC) {
2653 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2654 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2655 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2656
2657 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2658 "InitiatingHeapOccupancyPercent");
2659 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2660 "G1RefProcDrainInterval");
2661 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2662 "G1ConcMarkStepDurationMillis");
2663 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2664 "G1ConcRSHotCardLimit");
2665 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2666 "G1ConcRSLogCacheSize");
2667 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2668 "StringDeduplicationAgeThreshold");
2669 }
2670 if (UseConcMarkSweepGC) {
2671 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2672 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2673 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2674 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2675
2676 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2677
2678 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2679 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2680 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2681
2682 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2683
2684 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2685 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2686
2687 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2688 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2689 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2690
2691 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2692
2693 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2694
2695 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2696 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2697 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2698 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2699 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2700 }
2701
2702 if (UseParallelGC || UseParallelOldGC) {
2703 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2704 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2705
2706 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2707 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2708
2709 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2710 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2711
2712 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2713
2714 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2715 }
2716 #endif // INCLUDE_ALL_GCS
2717
2718 status = status && verify_interval(RefDiscoveryPolicy,
2719 ReferenceProcessor::DiscoveryPolicyMin,
2720 ReferenceProcessor::DiscoveryPolicyMax,
2721 "RefDiscoveryPolicy");
2722
2723 // Limit the lower bound of this flag to 1 as it is used in a division
2724 // expression.
2725 status = status && verify_interval(TLABWasteTargetPercent,
2726 1, 100, "TLABWasteTargetPercent");
2727
2728 status = status && verify_object_alignment();
2729
2730 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2731 "CompressedClassSpaceSize");
2732
2733 status = status && verify_interval(MarkStackSizeMax,
2734 1, (max_jint - 1), "MarkStackSizeMax");
2735 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2736
2737 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2738
2739 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2740
2741 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2742
2743 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2744 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2745
2746 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2747
2748 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2749 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2750 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2751 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2752
2753 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2754 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2755
2756 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2757 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2758 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2759
2760 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2761 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2762
2763 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2764 // just for that, so hardcode here.
2765 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2766 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2767 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2768 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2769
2770 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2771 #ifdef COMPILER1
2772 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2773 #endif
2774
2775 if (PrintNMTStatistics) {
2776 #if INCLUDE_NMT
2777 if (MemTracker::tracking_level() == NMT_off) {
2778 #endif // INCLUDE_NMT
2779 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2780 PrintNMTStatistics = false;
2781 #if INCLUDE_NMT
2782 }
2783 #endif
2784 }
2785
2786 // Need to limit the extent of the padding to reasonable size.
2787 // 8K is well beyond the reasonable HW cache line size, even with the
2788 // aggressive prefetching, while still leaving the room for segregating
2789 // among the distinct pages.
2790 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2791 jio_fprintf(defaultStream::error_stream(),
2792 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2793 ContendedPaddingWidth, 0, 8192);
2794 status = false;
2795 }
2796
2797 // Need to enforce the padding not to break the existing field alignments.
2798 // It is sufficient to check against the largest type size.
2799 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2800 jio_fprintf(defaultStream::error_stream(),
2801 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2802 ContendedPaddingWidth, BytesPerLong);
2803 status = false;
2804 }
2805
2806 // Check lower bounds of the code cache
2807 // Template Interpreter code is approximately 3X larger in debug builds.
2808 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2809 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2810 jio_fprintf(defaultStream::error_stream(),
2811 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2812 os::vm_page_size()/K);
2813 status = false;
2814 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2815 jio_fprintf(defaultStream::error_stream(),
2816 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2817 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2818 status = false;
2819 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2820 jio_fprintf(defaultStream::error_stream(),
2821 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2822 min_code_cache_size/K);
2823 status = false;
2824 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2825 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2826 jio_fprintf(defaultStream::error_stream(),
2827 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2828 CODE_CACHE_SIZE_LIMIT/M);
2829 status = false;
2830 }
2831
2832 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2833 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2834
2835 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2836 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2837 }
2838
2839 #ifdef COMPILER1
2840 status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
2841 #endif
2842
2843 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2844 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2845 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2846 // Check the minimum number of compiler threads
2847 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2848
2849 return status;
2850 }
2851
2852 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2853 const char* option_type) {
2854 if (ignore) return false;
2855
2856 const char* spacer = " ";
2857 if (option_type == NULL) {
2858 option_type = ++spacer; // Set both to the empty string.
2859 }
2860
2861 if (os::obsolete_option(option)) {
2862 jio_fprintf(defaultStream::error_stream(),
2863 "Obsolete %s%soption: %s\n", option_type, spacer,
2864 option->optionString);
2865 return false;
2866 } else {
2867 jio_fprintf(defaultStream::error_stream(),
2868 "Unrecognized %s%soption: %s\n", option_type, spacer,
2869 option->optionString);
2870 return true;
2871 }
2872 }
2873
2874 static const char* user_assertion_options[] = {
2875 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2876 };
2877
2878 static const char* system_assertion_options[] = {
2879 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2880 };
2881
2882 // Return true if any of the strings in null-terminated array 'names' matches.
2883 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2884 // the option must match exactly.
2885 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2886 bool tail_allowed) {
2887 for (/* empty */; *names != NULL; ++names) {
2888 if (match_option(option, *names, tail)) {
2889 if (**tail == '\0' || tail_allowed && **tail == ':') {
2890 return true;
2891 }
2892 }
2893 }
2894 return false;
2895 }
2896
2897 bool Arguments::parse_uintx(const char* value,
2898 uintx* uintx_arg,
2899 uintx min_size) {
2900
2901 // Check the sign first since atomull() parses only unsigned values.
2902 bool value_is_positive = !(*value == '-');
2903
2904 if (value_is_positive) {
2905 julong n;
2906 bool good_return = atomull(value, &n);
2907 if (good_return) {
2908 bool above_minimum = n >= min_size;
2909 bool value_is_too_large = n > max_uintx;
2910
2911 if (above_minimum && !value_is_too_large) {
2912 *uintx_arg = n;
2913 return true;
2914 }
2915 }
2916 }
2917 return false;
2918 }
2919
2920 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2921 julong* long_arg,
2922 julong min_size) {
2923 if (!atomull(s, long_arg)) return arg_unreadable;
2924 return check_memory_size(*long_arg, min_size);
2925 }
2926
2927 // Parse JavaVMInitArgs structure
2928
2929 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2930 // For components of the system classpath.
2931 SysClassPath scp(Arguments::get_sysclasspath());
2932 bool scp_assembly_required = false;
2933
2934 // Save default settings for some mode flags
2935 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2936 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2937 Arguments::_ClipInlining = ClipInlining;
2938 Arguments::_BackgroundCompilation = BackgroundCompilation;
2939
2940 // Setup flags for mixed which is the default
2941 set_mode_flags(_mixed);
2942
2943 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2944 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2945 if (result != JNI_OK) {
2946 return result;
2947 }
2948
2949 // Parse JavaVMInitArgs structure passed in
2950 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2951 if (result != JNI_OK) {
2952 return result;
2953 }
2954
2955 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2956 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2957 if (result != JNI_OK) {
2958 return result;
2959 }
2960
2961 // We need to ensure processor and memory resources have been properly
2962 // configured - which may rely on arguments we just processed - before
2963 // doing the final argument processing. Any argument processing that
2964 // needs to know about processor and memory resources must occur after
2965 // this point.
2966
2967 os::init_container_support();
2968
2969 // Do final processing now that all arguments have been parsed
2970 result = finalize_vm_init_args(&scp, scp_assembly_required);
2971 if (result != JNI_OK) {
2972 return result;
2973 }
2974
2975 return JNI_OK;
2976 }
2977
2978 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2979 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2980 // are dealing with -agentpath (case where name is a path), otherwise with
2981 // -agentlib
2982 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2983 char *_name;
2984 const char *_hprof = "hprof", *_jdwp = "jdwp";
2985 size_t _len_hprof, _len_jdwp, _len_prefix;
2986
2987 if (is_path) {
2988 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2989 return false;
2990 }
2991
2992 _name++; // skip past last path separator
2993 _len_prefix = strlen(JNI_LIB_PREFIX);
2994
2995 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2996 return false;
2997 }
2998
2999 _name += _len_prefix;
3000 _len_hprof = strlen(_hprof);
3001 _len_jdwp = strlen(_jdwp);
3002
3003 if (strncmp(_name, _hprof, _len_hprof) == 0) {
3004 _name += _len_hprof;
3005 }
3006 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
3007 _name += _len_jdwp;
3008 }
3009 else {
3010 return false;
3011 }
3012
3013 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
3014 return false;
3015 }
3016
3017 return true;
3018 }
3019
3020 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
3021 return true;
3022 }
3023
3024 return false;
3025 }
3026
3027 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
3028 SysClassPath* scp_p,
3029 bool* scp_assembly_required_p,
3030 Flag::Flags origin) {
3031 // Remaining part of option string
3032 const char* tail;
3033
3034 // iterate over arguments
3035 for (int index = 0; index < args->nOptions; index++) {
3036 bool is_absolute_path = false; // for -agentpath vs -agentlib
3037
3038 const JavaVMOption* option = args->options + index;
3039
3040 if (!match_option(option, "-Djava.class.path", &tail) &&
3041 !match_option(option, "-Dsun.java.command", &tail) &&
3042 !match_option(option, "-Dsun.java.launcher", &tail)) {
3043
3044 // add all jvm options to the jvm_args string. This string
3045 // is used later to set the java.vm.args PerfData string constant.
3046 // the -Djava.class.path and the -Dsun.java.command options are
3047 // omitted from jvm_args string as each have their own PerfData
3048 // string constant object.
3049 build_jvm_args(option->optionString);
3050 }
3051
3052 // -verbose:[class/gc/jni]
3053 if (match_option(option, "-verbose", &tail)) {
3054 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
3055 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
3056 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
3057 } else if (!strcmp(tail, ":gc")) {
3058 FLAG_SET_CMDLINE(bool, PrintGC, true);
3059 } else if (!strcmp(tail, ":jni")) {
3060 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
3061 }
3062 // -da / -ea / -disableassertions / -enableassertions
3063 // These accept an optional class/package name separated by a colon, e.g.,
3064 // -da:java.lang.Thread.
3065 } else if (match_option(option, user_assertion_options, &tail, true)) {
3066 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
3067 if (*tail == '\0') {
3068 JavaAssertions::setUserClassDefault(enable);
3069 } else {
3070 assert(*tail == ':', "bogus match by match_option()");
3071 JavaAssertions::addOption(tail + 1, enable);
3072 }
3073 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
3074 } else if (match_option(option, system_assertion_options, &tail, false)) {
3075 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
3076 JavaAssertions::setSystemClassDefault(enable);
3077 // -bootclasspath:
3078 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
3079 scp_p->reset_path(tail);
3080 *scp_assembly_required_p = true;
3081 // -bootclasspath/a:
3082 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
3083 scp_p->add_suffix(tail);
3084 *scp_assembly_required_p = true;
3085 // -bootclasspath/p:
3086 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
3087 scp_p->add_prefix(tail);
3088 *scp_assembly_required_p = true;
3089 // -Xrun
3090 } else if (match_option(option, "-Xrun", &tail)) {
3091 if (tail != NULL) {
3092 const char* pos = strchr(tail, ':');
3093 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
3094 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
3095 name[len] = '\0';
3096
3097 char *options = NULL;
3098 if(pos != NULL) {
3099 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
3100 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
3101 }
3102 #if !INCLUDE_JVMTI
3103 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
3104 jio_fprintf(defaultStream::error_stream(),
3105 "Profiling and debugging agents are not supported in this VM\n");
3106 return JNI_ERR;
3107 }
3108 #endif // !INCLUDE_JVMTI
3109 add_init_library(name, options);
3110 }
3111 // -agentlib and -agentpath
3112 } else if (match_option(option, "-agentlib:", &tail) ||
3113 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
3114 if(tail != NULL) {
3115 const char* pos = strchr(tail, '=');
3116 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
3117 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
3118 name[len] = '\0';
3119
3120 char *options = NULL;
3121 if(pos != NULL) {
3122 size_t length = strlen(pos + 1) + 1;
3123 options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
3124 jio_snprintf(options, length, "%s", pos + 1);
3125 }
3126 #if !INCLUDE_JVMTI
3127 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
3128 jio_fprintf(defaultStream::error_stream(),
3129 "Profiling and debugging agents are not supported in this VM\n");
3130 return JNI_ERR;
3131 }
3132 #endif // !INCLUDE_JVMTI
3133 add_init_agent(name, options, is_absolute_path);
3134 }
3135 // -javaagent
3136 } else if (match_option(option, "-javaagent:", &tail)) {
3137 #if !INCLUDE_JVMTI
3138 jio_fprintf(defaultStream::error_stream(),
3139 "Instrumentation agents are not supported in this VM\n");
3140 return JNI_ERR;
3141 #else
3142 if(tail != NULL) {
3143 size_t length = strlen(tail) + 1;
3144 char *options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
3145 jio_snprintf(options, length, "%s", tail);
3146 add_init_agent("instrument", options, false);
3147 }
3148 #endif // !INCLUDE_JVMTI
3149 // -Xnoclassgc
3150 } else if (match_option(option, "-Xnoclassgc", &tail)) {
3151 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
3152 // -Xincgc: i-CMS
3153 } else if (match_option(option, "-Xincgc", &tail)) {
3154 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
3155 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
3156 // -Xnoincgc: no i-CMS
3157 } else if (match_option(option, "-Xnoincgc", &tail)) {
3158 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
3159 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
3160 // -Xconcgc
3161 } else if (match_option(option, "-Xconcgc", &tail)) {
3162 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
3163 // -Xnoconcgc
3164 } else if (match_option(option, "-Xnoconcgc", &tail)) {
3165 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
3166 // -Xbatch
3167 } else if (match_option(option, "-Xbatch", &tail)) {
3168 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3169 // -Xmn for compatibility with other JVM vendors
3170 } else if (match_option(option, "-Xmn", &tail)) {
3171 julong long_initial_young_size = 0;
3172 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
3173 if (errcode != arg_in_range) {
3174 jio_fprintf(defaultStream::error_stream(),
3175 "Invalid initial young generation size: %s\n", option->optionString);
3176 describe_range_error(errcode);
3177 return JNI_EINVAL;
3178 }
3179 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
3180 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
3181 // -Xms
3182 } else if (match_option(option, "-Xms", &tail)) {
3183 julong long_initial_heap_size = 0;
3184 // an initial heap size of 0 means automatically determine
3185 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
3186 if (errcode != arg_in_range) {
3187 jio_fprintf(defaultStream::error_stream(),
3188 "Invalid initial heap size: %s\n", option->optionString);
3189 describe_range_error(errcode);
3190 return JNI_EINVAL;
3191 }
3192 set_min_heap_size((uintx)long_initial_heap_size);
3193 // Currently the minimum size and the initial heap sizes are the same.
3194 // Can be overridden with -XX:InitialHeapSize.
3195 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
3196 // -Xmx
3197 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
3198 julong long_max_heap_size = 0;
3199 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
3200 if (errcode != arg_in_range) {
3201 jio_fprintf(defaultStream::error_stream(),
3202 "Invalid maximum heap size: %s\n", option->optionString);
3203 describe_range_error(errcode);
3204 return JNI_EINVAL;
3205 }
3206 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
3207 // Xmaxf
3208 } else if (match_option(option, "-Xmaxf", &tail)) {
3209 char* err;
3210 int maxf = (int)(strtod(tail, &err) * 100);
3211 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
3212 jio_fprintf(defaultStream::error_stream(),
3213 "Bad max heap free percentage size: %s\n",
3214 option->optionString);
3215 return JNI_EINVAL;
3216 } else {
3217 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
3218 }
3219 // Xminf
3220 } else if (match_option(option, "-Xminf", &tail)) {
3221 char* err;
3222 int minf = (int)(strtod(tail, &err) * 100);
3223 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
3224 jio_fprintf(defaultStream::error_stream(),
3225 "Bad min heap free percentage size: %s\n",
3226 option->optionString);
3227 return JNI_EINVAL;
3228 } else {
3229 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
3230 }
3231 // -Xss
3232 } else if (match_option(option, "-Xss", &tail)) {
3233 julong long_ThreadStackSize = 0;
3234 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
3235 if (errcode != arg_in_range) {
3236 jio_fprintf(defaultStream::error_stream(),
3237 "Invalid thread stack size: %s\n", option->optionString);
3238 describe_range_error(errcode);
3239 return JNI_EINVAL;
3240 }
3241 // Internally track ThreadStackSize in units of 1024 bytes.
3242 FLAG_SET_CMDLINE(intx, ThreadStackSize,
3243 round_to((int)long_ThreadStackSize, K) / K);
3244 // -Xoss
3245 } else if (match_option(option, "-Xoss", &tail)) {
3246 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
3247 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3248 julong long_CodeCacheExpansionSize = 0;
3249 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3250 if (errcode != arg_in_range) {
3251 jio_fprintf(defaultStream::error_stream(),
3252 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3253 os::vm_page_size()/K);
3254 return JNI_EINVAL;
3255 }
3256 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
3257 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3258 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3259 julong long_ReservedCodeCacheSize = 0;
3260
3261 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3262 if (errcode != arg_in_range) {
3263 jio_fprintf(defaultStream::error_stream(),
3264 "Invalid maximum code cache size: %s.\n", option->optionString);
3265 return JNI_EINVAL;
3266 }
3267 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
3268 //-XX:IncreaseFirstTierCompileThresholdAt=
3269 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
3270 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
3271 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
3272 jio_fprintf(defaultStream::error_stream(),
3273 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
3274 option->optionString);
3275 return JNI_EINVAL;
3276 }
3277 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
3278 // -green
3279 } else if (match_option(option, "-green", &tail)) {
3280 jio_fprintf(defaultStream::error_stream(),
3281 "Green threads support not available\n");
3282 return JNI_EINVAL;
3283 // -native
3284 } else if (match_option(option, "-native", &tail)) {
3285 // HotSpot always uses native threads, ignore silently for compatibility
3286 // -Xsqnopause
3287 } else if (match_option(option, "-Xsqnopause", &tail)) {
3288 // EVM option, ignore silently for compatibility
3289 // -Xrs
3290 } else if (match_option(option, "-Xrs", &tail)) {
3291 // Classic/EVM option, new functionality
3292 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3293 } else if (match_option(option, "-Xusealtsigs", &tail)) {
3294 // change default internal VM signals used - lower case for back compat
3295 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3296 // -Xoptimize
3297 } else if (match_option(option, "-Xoptimize", &tail)) {
3298 // EVM option, ignore silently for compatibility
3299 // -Xprof
3300 } else if (match_option(option, "-Xprof", &tail)) {
3301 #if INCLUDE_FPROF
3302 _has_profile = true;
3303 #else // INCLUDE_FPROF
3304 jio_fprintf(defaultStream::error_stream(),
3305 "Flat profiling is not supported in this VM.\n");
3306 return JNI_ERR;
3307 #endif // INCLUDE_FPROF
3308 // -Xconcurrentio
3309 } else if (match_option(option, "-Xconcurrentio", &tail)) {
3310 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3311 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3312 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3313 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3314 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
3315
3316 // -Xinternalversion
3317 } else if (match_option(option, "-Xinternalversion", &tail)) {
3318 jio_fprintf(defaultStream::output_stream(), "%s\n",
3319 VM_Version::internal_vm_info_string());
3320 vm_exit(0);
3321 #ifndef PRODUCT
3322 // -Xprintflags
3323 } else if (match_option(option, "-Xprintflags", &tail)) {
3324 CommandLineFlags::printFlags(tty, false);
3325 vm_exit(0);
3326 #endif
3327 // -D
3328 } else if (match_option(option, "-D", &tail)) {
3329 if (CheckEndorsedAndExtDirs) {
3330 if (match_option(option, "-Djava.endorsed.dirs=", &tail)) {
3331 // abort if -Djava.endorsed.dirs is set
3332 jio_fprintf(defaultStream::output_stream(),
3333 "-Djava.endorsed.dirs will not be supported in a future release.\n"
3334 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3335 return JNI_EINVAL;
3336 }
3337 if (match_option(option, "-Djava.ext.dirs=", &tail)) {
3338 // abort if -Djava.ext.dirs is set
3339 jio_fprintf(defaultStream::output_stream(),
3340 "-Djava.ext.dirs will not be supported in a future release.\n"
3341 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3342 return JNI_EINVAL;
3343 }
3344 }
3345
3346 if (!add_property(tail)) {
3347 return JNI_ENOMEM;
3348 }
3349 // Out of the box management support
3350 if (match_option(option, "-Dcom.sun.management", &tail)) {
3351 #if INCLUDE_MANAGEMENT
3352 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3353 #else
3354 jio_fprintf(defaultStream::output_stream(),
3355 "-Dcom.sun.management is not supported in this VM.\n");
3356 return JNI_ERR;
3357 #endif
3358 }
3359 // -Xint
3360 } else if (match_option(option, "-Xint", &tail)) {
3361 set_mode_flags(_int);
3362 // -Xmixed
3363 } else if (match_option(option, "-Xmixed", &tail)) {
3364 set_mode_flags(_mixed);
3365 // -Xcomp
3366 } else if (match_option(option, "-Xcomp", &tail)) {
3367 // for testing the compiler; turn off all flags that inhibit compilation
3368 set_mode_flags(_comp);
3369 // -Xshare:dump
3370 } else if (match_option(option, "-Xshare:dump", &tail)) {
3371 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3372 set_mode_flags(_int); // Prevent compilation, which creates objects
3373 // -Xshare:on
3374 } else if (match_option(option, "-Xshare:on", &tail)) {
3375 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3376 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3377 // -Xshare:auto
3378 } else if (match_option(option, "-Xshare:auto", &tail)) {
3379 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3380 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3381 // -Xshare:off
3382 } else if (match_option(option, "-Xshare:off", &tail)) {
3383 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3384 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3385 // -Xverify
3386 } else if (match_option(option, "-Xverify", &tail)) {
3387 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3388 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3389 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3390 } else if (strcmp(tail, ":remote") == 0) {
3391 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3392 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3393 } else if (strcmp(tail, ":none") == 0) {
3394 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3395 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3396 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3397 return JNI_EINVAL;
3398 }
3399 // -Xdebug
3400 } else if (match_option(option, "-Xdebug", &tail)) {
3401 // note this flag has been used, then ignore
3402 set_xdebug_mode(true);
3403 // -Xnoagent
3404 } else if (match_option(option, "-Xnoagent", &tail)) {
3405 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3406 } else if (match_option(option, "-Xboundthreads", &tail)) {
3407 // Bind user level threads to kernel threads (Solaris only)
3408 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3409 } else if (match_option(option, "-Xloggc:", &tail)) {
3410 // Redirect GC output to the file. -Xloggc:<filename>
3411 // ostream_init_log(), when called will use this filename
3412 // to initialize a fileStream.
3413 _gc_log_filename = strdup(tail);
3414 if (!is_filename_valid(_gc_log_filename)) {
3415 jio_fprintf(defaultStream::output_stream(),
3416 "Invalid file name for use with -Xloggc: Filename can only contain the "
3417 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3418 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3419 return JNI_EINVAL;
3420 }
3421 FLAG_SET_CMDLINE(bool, PrintGC, true);
3422 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3423
3424 // JNI hooks
3425 } else if (match_option(option, "-Xcheck", &tail)) {
3426 if (!strcmp(tail, ":jni")) {
3427 #if !INCLUDE_JNI_CHECK
3428 warning("JNI CHECKING is not supported in this VM");
3429 #else
3430 CheckJNICalls = true;
3431 #endif // INCLUDE_JNI_CHECK
3432 } else if (is_bad_option(option, args->ignoreUnrecognized,
3433 "check")) {
3434 return JNI_EINVAL;
3435 }
3436 } else if (match_option(option, "vfprintf", &tail)) {
3437 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3438 } else if (match_option(option, "exit", &tail)) {
3439 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3440 } else if (match_option(option, "abort", &tail)) {
3441 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3442 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3443 // The last option must always win.
3444 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3445 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3446 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3447 // The last option must always win.
3448 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3449 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3450 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3451 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3452 jio_fprintf(defaultStream::error_stream(),
3453 "Please use CMSClassUnloadingEnabled in place of "
3454 "CMSPermGenSweepingEnabled in the future\n");
3455 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3456 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3457 jio_fprintf(defaultStream::error_stream(),
3458 "Please use -XX:+UseGCOverheadLimit in place of "
3459 "-XX:+UseGCTimeLimit in the future\n");
3460 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3461 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3462 jio_fprintf(defaultStream::error_stream(),
3463 "Please use -XX:-UseGCOverheadLimit in place of "
3464 "-XX:-UseGCTimeLimit in the future\n");
3465 // The TLE options are for compatibility with 1.3 and will be
3466 // removed without notice in a future release. These options
3467 // are not to be documented.
3468 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3469 // No longer used.
3470 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3471 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3472 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3473 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3474 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3475 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3476 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3477 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3478 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3479 // No longer used.
3480 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3481 julong long_tlab_size = 0;
3482 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3483 if (errcode != arg_in_range) {
3484 jio_fprintf(defaultStream::error_stream(),
3485 "Invalid TLAB size: %s\n", option->optionString);
3486 describe_range_error(errcode);
3487 return JNI_EINVAL;
3488 }
3489 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3490 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3491 // No longer used.
3492 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3493 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3494 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3495 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3496 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3497 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3498 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3499 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3500 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3501 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3502 } else if (match_option(option, "-XX:+ErrorFileToStderr", &tail)) {
3503 FLAG_SET_CMDLINE(bool, ErrorFileToStdout, false);
3504 FLAG_SET_CMDLINE(bool, ErrorFileToStderr, true);
3505 } else if (match_option(option, "-XX:+ErrorFileToStdout", &tail)) {
3506 FLAG_SET_CMDLINE(bool, ErrorFileToStderr, false);
3507 FLAG_SET_CMDLINE(bool, ErrorFileToStdout, true);
3508 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3509 #if defined(DTRACE_ENABLED)
3510 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3511 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3512 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3513 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3514 #else // defined(DTRACE_ENABLED)
3515 jio_fprintf(defaultStream::error_stream(),
3516 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3517 return JNI_EINVAL;
3518 #endif // defined(DTRACE_ENABLED)
3519 #ifdef ASSERT
3520 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3521 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3522 // disable scavenge before parallel mark-compact
3523 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3524 #endif
3525 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3526 julong cms_blocks_to_claim = (julong)atol(tail);
3527 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3528 jio_fprintf(defaultStream::error_stream(),
3529 "Please use -XX:OldPLABSize in place of "
3530 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3531 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3532 julong cms_blocks_to_claim = (julong)atol(tail);
3533 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3534 jio_fprintf(defaultStream::error_stream(),
3535 "Please use -XX:OldPLABSize in place of "
3536 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3537 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3538 julong old_plab_size = 0;
3539 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3540 if (errcode != arg_in_range) {
3541 jio_fprintf(defaultStream::error_stream(),
3542 "Invalid old PLAB size: %s\n", option->optionString);
3543 describe_range_error(errcode);
3544 return JNI_EINVAL;
3545 }
3546 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3547 jio_fprintf(defaultStream::error_stream(),
3548 "Please use -XX:OldPLABSize in place of "
3549 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3550 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3551 julong young_plab_size = 0;
3552 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3553 if (errcode != arg_in_range) {
3554 jio_fprintf(defaultStream::error_stream(),
3555 "Invalid young PLAB size: %s\n", option->optionString);
3556 describe_range_error(errcode);
3557 return JNI_EINVAL;
3558 }
3559 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3560 jio_fprintf(defaultStream::error_stream(),
3561 "Please use -XX:YoungPLABSize in place of "
3562 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3563 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3564 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3565 julong stack_size = 0;
3566 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3567 if (errcode != arg_in_range) {
3568 jio_fprintf(defaultStream::error_stream(),
3569 "Invalid mark stack size: %s\n", option->optionString);
3570 describe_range_error(errcode);
3571 return JNI_EINVAL;
3572 }
3573 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3574 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3575 julong max_stack_size = 0;
3576 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3577 if (errcode != arg_in_range) {
3578 jio_fprintf(defaultStream::error_stream(),
3579 "Invalid maximum mark stack size: %s\n",
3580 option->optionString);
3581 describe_range_error(errcode);
3582 return JNI_EINVAL;
3583 }
3584 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3585 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3586 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3587 uintx conc_threads = 0;
3588 if (!parse_uintx(tail, &conc_threads, 1)) {
3589 jio_fprintf(defaultStream::error_stream(),
3590 "Invalid concurrent threads: %s\n", option->optionString);
3591 return JNI_EINVAL;
3592 }
3593 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3594 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3595 julong max_direct_memory_size = 0;
3596 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3597 if (errcode != arg_in_range) {
3598 jio_fprintf(defaultStream::error_stream(),
3599 "Invalid maximum direct memory size: %s\n",
3600 option->optionString);
3601 describe_range_error(errcode);
3602 return JNI_EINVAL;
3603 }
3604 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3605 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3606 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3607 // away and will cause VM initialization failures!
3608 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3609 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3610 #if !INCLUDE_MANAGEMENT
3611 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3612 jio_fprintf(defaultStream::error_stream(),
3613 "ManagementServer is not supported in this VM.\n");
3614 return JNI_ERR;
3615 #endif // INCLUDE_MANAGEMENT
3616 #if INCLUDE_JFR
3617 } else if (match_jfr_option(&option)) {
3618 return JNI_EINVAL;
3619 #endif
3620 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3621 // Skip -XX:Flags= since that case has already been handled
3622 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3623 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3624 return JNI_EINVAL;
3625 }
3626 }
3627 // Unknown option
3628 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3629 return JNI_ERR;
3630 }
3631 }
3632
3633 // PrintSharedArchiveAndExit will turn on
3634 // -Xshare:on
3635 // -XX:+TraceClassPaths
3636 if (PrintSharedArchiveAndExit) {
3637 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3638 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3639 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3640 }
3641
3642 // Change the default value for flags which have different default values
3643 // when working with older JDKs.
3644 #ifdef LINUX
3645 if (JDK_Version::current().compare_major(6) <= 0 &&
3646 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3647 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3648 }
3649 #endif // LINUX
3650 fix_appclasspath();
3651 return JNI_OK;
3652 }
3653
3654 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3655 //
3656 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3657 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3658 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3659 // path is treated as the current directory.
3660 //
3661 // This causes problems with CDS, which requires that all directories specified in the classpath
3662 // must be empty. In most cases, applications do NOT want to load classes from the current
3663 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3664 // scripts compatible with CDS.
3665 void Arguments::fix_appclasspath() {
3666 if (IgnoreEmptyClassPaths) {
3667 const char separator = *os::path_separator();
3668 const char* src = _java_class_path->value();
3669
3670 // skip over all the leading empty paths
3671 while (*src == separator) {
3672 src ++;
3673 }
3674
3675 char* copy = os::strdup(src, mtInternal);
3676
3677 // trim all trailing empty paths
3678 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3679 *tail = '\0';
3680 }
3681
3682 char from[3] = {separator, separator, '\0'};
3683 char to [2] = {separator, '\0'};
3684 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3685 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3686 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3687 }
3688
3689 _java_class_path->set_value(copy);
3690 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3691 }
3692
3693 if (!PrintSharedArchiveAndExit) {
3694 ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
3695 }
3696 }
3697
3698 static bool has_jar_files(const char* directory) {
3699 DIR* dir = os::opendir(directory);
3700 if (dir == NULL) return false;
3701
3702 struct dirent *entry;
3703 bool hasJarFile = false;
3704 while (!hasJarFile && (entry = os::readdir(dir)) != NULL) {
3705 const char* name = entry->d_name;
3706 const char* ext = name + strlen(name) - 4;
3707 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3708 }
3709 os::closedir(dir);
3710 return hasJarFile ;
3711 }
3712
3713 // returns the number of directories in the given path containing JAR files
3714 // If the skip argument is not NULL, it will skip that directory
3715 static int check_non_empty_dirs(const char* path, const char* type, const char* skip) {
3716 const char separator = *os::path_separator();
3717 const char* const end = path + strlen(path);
3718 int nonEmptyDirs = 0;
3719 while (path < end) {
3720 const char* tmp_end = strchr(path, separator);
3721 if (tmp_end == NULL) {
3722 if ((skip == NULL || strcmp(path, skip) != 0) && has_jar_files(path)) {
3723 nonEmptyDirs++;
3724 jio_fprintf(defaultStream::output_stream(),
3725 "Non-empty %s directory: %s\n", type, path);
3726 }
3727 path = end;
3728 } else {
3729 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3730 memcpy(dirpath, path, tmp_end - path);
3731 dirpath[tmp_end - path] = '\0';
3732 if ((skip == NULL || strcmp(dirpath, skip) != 0) && has_jar_files(dirpath)) {
3733 nonEmptyDirs++;
3734 jio_fprintf(defaultStream::output_stream(),
3735 "Non-empty %s directory: %s\n", type, dirpath);
3736 }
3737 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
3738 path = tmp_end + 1;
3739 }
3740 }
3741 return nonEmptyDirs;
3742 }
3743
3744 // Returns true if endorsed standards override mechanism and extension mechanism
3745 // are not used.
3746 static bool check_endorsed_and_ext_dirs() {
3747 if (!CheckEndorsedAndExtDirs)
3748 return true;
3749
3750 char endorsedDir[JVM_MAXPATHLEN];
3751 char extDir[JVM_MAXPATHLEN];
3752 const char* fileSep = os::file_separator();
3753 jio_snprintf(endorsedDir, sizeof(endorsedDir), "%s%slib%sendorsed",
3754 Arguments::get_java_home(), fileSep, fileSep);
3755 jio_snprintf(extDir, sizeof(extDir), "%s%slib%sext",
3756 Arguments::get_java_home(), fileSep, fileSep);
3757
3758 // check endorsed directory
3759 int nonEmptyDirs = check_non_empty_dirs(Arguments::get_endorsed_dir(), "endorsed", NULL);
3760
3761 // check the extension directories but skip the default lib/ext directory
3762 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs(), "extension", extDir);
3763
3764 // List of JAR files installed in the default lib/ext directory.
3765 // -XX:+CheckEndorsedAndExtDirs checks if any non-JDK file installed
3766 static const char* jdk_ext_jars[] = {
3767 "access-bridge-32.jar",
3768 "access-bridge-64.jar",
3769 "access-bridge.jar",
3770 "cldrdata.jar",
3771 "dnsns.jar",
3772 "jaccess.jar",
3773 "jfxrt.jar",
3774 "localedata.jar",
3775 "nashorn.jar",
3776 "sunec.jar",
3777 "sunjce_provider.jar",
3778 "sunmscapi.jar",
3779 "sunpkcs11.jar",
3780 "ucrypto.jar",
3781 "zipfs.jar",
3782 NULL
3783 };
3784
3785 // check if the default lib/ext directory has any non-JDK jar files; if so, error
3786 DIR* dir = os::opendir(extDir);
3787 if (dir != NULL) {
3788 int num_ext_jars = 0;
3789 struct dirent *entry;
3790 while ((entry = os::readdir(dir)) != NULL) {
3791 const char* name = entry->d_name;
3792 const char* ext = name + strlen(name) - 4;
3793 if (ext > name && (os::file_name_strcmp(ext, ".jar") == 0)) {
3794 bool is_jdk_jar = false;
3795 const char* jarfile = NULL;
3796 for (int i=0; (jarfile = jdk_ext_jars[i]) != NULL; i++) {
3797 if (os::file_name_strcmp(name, jarfile) == 0) {
3798 is_jdk_jar = true;
3799 break;
3800 }
3801 }
3802 if (!is_jdk_jar) {
3803 jio_fprintf(defaultStream::output_stream(),
3804 "%s installed in <JAVA_HOME>/lib/ext\n", name);
3805 num_ext_jars++;
3806 }
3807 }
3808 }
3809 os::closedir(dir);
3810 if (num_ext_jars > 0) {
3811 nonEmptyDirs += 1;
3812 }
3813 }
3814
3815 // check if the default lib/endorsed directory exists; if so, error
3816 dir = os::opendir(endorsedDir);
3817 if (dir != NULL) {
3818 jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed exists\n");
3819 os::closedir(dir);
3820 nonEmptyDirs += 1;
3821 }
3822
3823 if (nonEmptyDirs > 0) {
3824 jio_fprintf(defaultStream::output_stream(),
3825 "Endorsed standards override mechanism and extension mechanism "
3826 "will not be supported in a future release.\n"
3827 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3828 return false;
3829 }
3830
3831 return true;
3832 }
3833
3834 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3835 // This must be done after all -D arguments have been processed.
3836 scp_p->expand_endorsed();
3837
3838 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3839 // Assemble the bootclasspath elements into the final path.
3840 Arguments::set_sysclasspath(scp_p->combined_path());
3841 }
3842
3843 if (!check_endorsed_and_ext_dirs()) {
3844 return JNI_ERR;
3845 }
3846
3847 // This must be done after all arguments have been processed
3848 // and the container support has been initialized since AggressiveHeap
3849 // relies on the amount of total memory available.
3850 if (AggressiveHeap) {
3851 jint result = set_aggressive_heap_flags();
3852 if (result != JNI_OK) {
3853 return result;
3854 }
3855 }
3856 // This must be done after all arguments have been processed.
3857 // java_compiler() true means set to "NONE" or empty.
3858 if (java_compiler() && !xdebug_mode()) {
3859 // For backwards compatibility, we switch to interpreted mode if
3860 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3861 // not specified.
3862 set_mode_flags(_int);
3863 }
3864 if (CompileThreshold == 0) {
3865 set_mode_flags(_int);
3866 }
3867
3868 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3869 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3870 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3871 }
3872
3873 #ifndef COMPILER2
3874 // Don't degrade server performance for footprint
3875 if (FLAG_IS_DEFAULT(UseLargePages) &&
3876 MaxHeapSize < LargePageHeapSizeThreshold) {
3877 // No need for large granularity pages w/small heaps.
3878 // Note that large pages are enabled/disabled for both the
3879 // Java heap and the code cache.
3880 FLAG_SET_DEFAULT(UseLargePages, false);
3881 }
3882
3883 #else
3884 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3885 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3886 }
3887 #endif
3888
3889 #ifndef TIERED
3890 // Tiered compilation is undefined.
3891 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3892 #endif
3893
3894 // If we are running in a headless jre, force java.awt.headless property
3895 // to be true unless the property has already been set.
3896 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3897 if (os::is_headless_jre()) {
3898 const char* headless = Arguments::get_property("java.awt.headless");
3899 if (headless == NULL) {
3900 char envbuffer[128];
3901 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3902 if (!add_property("java.awt.headless=true")) {
3903 return JNI_ENOMEM;
3904 }
3905 } else {
3906 char buffer[256];
3907 jio_snprintf(buffer, 256, "java.awt.headless=%s", envbuffer);
3908 if (!add_property(buffer)) {
3909 return JNI_ENOMEM;
3910 }
3911 }
3912 }
3913 }
3914
3915 if (!check_vm_args_consistency()) {
3916 return JNI_ERR;
3917 }
3918
3919 return JNI_OK;
3920 }
3921
3922 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3923 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3924 scp_assembly_required_p);
3925 }
3926
3927 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3928 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3929 scp_assembly_required_p);
3930 }
3931
3932 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3933 const int N_MAX_OPTIONS = 64;
3934 const int OPTION_BUFFER_SIZE = 1024;
3935 char buffer[OPTION_BUFFER_SIZE];
3936
3937 // The variable will be ignored if it exceeds the length of the buffer.
3938 // Don't check this variable if user has special privileges
3939 // (e.g. unix su command).
3940 if (os::getenv(name, buffer, sizeof(buffer)) &&
3941 !os::have_special_privileges()) {
3942 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3943 jio_fprintf(defaultStream::error_stream(),
3944 "Picked up %s: %s\n", name, buffer);
3945 char* rd = buffer; // pointer to the input string (rd)
3946 int i;
3947 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3948 while (isspace(*rd)) rd++; // skip whitespace
3949 if (*rd == 0) break; // we re done when the input string is read completely
3950
3951 // The output, option string, overwrites the input string.
3952 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3953 // input string (rd).
3954 char* wrt = rd;
3955
3956 options[i++].optionString = wrt; // Fill in option
3957 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3958 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3959 int quote = *rd; // matching quote to look for
3960 rd++; // don't copy open quote
3961 while (*rd != quote) { // include everything (even spaces) up until quote
3962 if (*rd == 0) { // string termination means unmatched string
3963 jio_fprintf(defaultStream::error_stream(),
3964 "Unmatched quote in %s\n", name);
3965 return JNI_ERR;
3966 }
3967 *wrt++ = *rd++; // copy to option string
3968 }
3969 rd++; // don't copy close quote
3970 } else {
3971 *wrt++ = *rd++; // copy to option string
3972 }
3973 }
3974 // Need to check if we're done before writing a NULL,
3975 // because the write could be to the byte that rd is pointing to.
3976 if (*rd++ == 0) {
3977 *wrt = 0;
3978 break;
3979 }
3980 *wrt = 0; // Zero terminate option
3981 }
3982 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3983 JavaVMInitArgs vm_args;
3984 vm_args.version = JNI_VERSION_1_2;
3985 vm_args.options = options;
3986 vm_args.nOptions = i;
3987 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3988
3989 if (PrintVMOptions) {
3990 const char* tail;
3991 for (int i = 0; i < vm_args.nOptions; i++) {
3992 const JavaVMOption *option = vm_args.options + i;
3993 if (match_option(option, "-XX:", &tail)) {
3994 logOption(tail);
3995 }
3996 }
3997 }
3998
3999 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
4000 }
4001 return JNI_OK;
4002 }
4003
4004 void Arguments::set_shared_spaces_flags() {
4005 if (DumpSharedSpaces) {
4006 if (FailOverToOldVerifier) {
4007 // Don't fall back to the old verifier on verification failure. If a
4008 // class fails verification with the split verifier, it might fail the
4009 // CDS runtime verifier constraint check. In that case, we don't want
4010 // to share the class. We only archive classes that pass the split verifier.
4011 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
4012 }
4013
4014 if (RequireSharedSpaces) {
4015 warning("cannot dump shared archive while using shared archive");
4016 }
4017 UseSharedSpaces = false;
4018 #ifdef _LP64
4019 if (!UseCompressedOops || !UseCompressedClassPointers) {
4020 vm_exit_during_initialization(
4021 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
4022 }
4023 } else {
4024 if (!UseCompressedOops || !UseCompressedClassPointers) {
4025 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
4026 }
4027 #endif
4028 }
4029 }
4030
4031 #if !INCLUDE_ALL_GCS
4032 static void force_serial_gc() {
4033 FLAG_SET_DEFAULT(UseSerialGC, true);
4034 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
4035 UNSUPPORTED_GC_OPTION(UseG1GC);
4036 UNSUPPORTED_GC_OPTION(UseParallelGC);
4037 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
4038 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
4039 UNSUPPORTED_GC_OPTION(UseParNewGC);
4040 }
4041 #endif // INCLUDE_ALL_GCS
4042
4043 // Sharing support
4044 // Construct the path to the archive
4045 static char* get_shared_archive_path() {
4046 char *shared_archive_path;
4047 if (SharedArchiveFile == NULL) {
4048 char jvm_path[JVM_MAXPATHLEN];
4049 os::jvm_path(jvm_path, sizeof(jvm_path));
4050 char *end = strrchr(jvm_path, *os::file_separator());
4051 if (end != NULL) *end = '\0';
4052 size_t jvm_path_len = strlen(jvm_path);
4053 size_t file_sep_len = strlen(os::file_separator());
4054 const size_t len = jvm_path_len + file_sep_len + 20;
4055 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
4056 if (shared_archive_path != NULL) {
4057 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
4058 jvm_path, os::file_separator());
4059 }
4060 } else {
4061 shared_archive_path = os::strdup(SharedArchiveFile, mtInternal);
4062 }
4063 return shared_archive_path;
4064 }
4065
4066 #ifndef PRODUCT
4067 // Determine whether LogVMOutput should be implicitly turned on.
4068 static bool use_vm_log() {
4069 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
4070 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
4071 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
4072 PrintAssembly || TraceDeoptimization || TraceDependencies ||
4073 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
4074 return true;
4075 }
4076
4077 #ifdef COMPILER1
4078 if (PrintC1Statistics) {
4079 return true;
4080 }
4081 #endif // COMPILER1
4082
4083 #ifdef COMPILER2
4084 if (PrintOptoAssembly || PrintOptoStatistics) {
4085 return true;
4086 }
4087 #endif // COMPILER2
4088
4089 return false;
4090 }
4091 #endif // PRODUCT
4092
4093 // Parse entry point called from JNI_CreateJavaVM
4094
4095 jint Arguments::parse(const JavaVMInitArgs* args) {
4096
4097 // Remaining part of option string
4098 const char* tail;
4099
4100 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4101 const char* hotspotrc = ".hotspotrc";
4102 bool settings_file_specified = false;
4103 bool needs_hotspotrc_warning = false;
4104
4105 ArgumentsExt::process_options(args);
4106
4107 const char* flags_file;
4108 int index;
4109 for (index = 0; index < args->nOptions; index++) {
4110 const JavaVMOption *option = args->options + index;
4111 if (match_option(option, "-XX:Flags=", &tail)) {
4112 flags_file = tail;
4113 settings_file_specified = true;
4114 }
4115 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
4116 PrintVMOptions = true;
4117 }
4118 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
4119 PrintVMOptions = false;
4120 }
4121 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
4122 IgnoreUnrecognizedVMOptions = true;
4123 }
4124 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
4125 IgnoreUnrecognizedVMOptions = false;
4126 }
4127 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
4128 CommandLineFlags::printFlags(tty, false);
4129 vm_exit(0);
4130 }
4131 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4132 #if INCLUDE_NMT
4133 // The launcher did not setup nmt environment variable properly.
4134 if (!MemTracker::check_launcher_nmt_support(tail)) {
4135 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4136 }
4137
4138 // Verify if nmt option is valid.
4139 if (MemTracker::verify_nmt_option()) {
4140 // Late initialization, still in single-threaded mode.
4141 if (MemTracker::tracking_level() >= NMT_summary) {
4142 MemTracker::init();
4143 }
4144 } else {
4145 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4146 }
4147 #else
4148 jio_fprintf(defaultStream::error_stream(),
4149 "Native Memory Tracking is not supported in this VM\n");
4150 return JNI_ERR;
4151 #endif
4152 }
4153
4154
4155 #ifndef PRODUCT
4156 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
4157 CommandLineFlags::printFlags(tty, true);
4158 vm_exit(0);
4159 }
4160 #endif
4161 }
4162
4163 if (IgnoreUnrecognizedVMOptions) {
4164 // uncast const to modify the flag args->ignoreUnrecognized
4165 *(jboolean*)(&args->ignoreUnrecognized) = true;
4166 }
4167
4168 // Parse specified settings file
4169 if (settings_file_specified) {
4170 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
4171 return JNI_EINVAL;
4172 }
4173 } else {
4174 #ifdef ASSERT
4175 // Parse default .hotspotrc settings file
4176 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
4177 return JNI_EINVAL;
4178 }
4179 #else
4180 struct stat buf;
4181 if (os::stat(hotspotrc, &buf) == 0) {
4182 needs_hotspotrc_warning = true;
4183 }
4184 #endif
4185 }
4186
4187 if (PrintVMOptions) {
4188 for (index = 0; index < args->nOptions; index++) {
4189 const JavaVMOption *option = args->options + index;
4190 if (match_option(option, "-XX:", &tail)) {
4191 logOption(tail);
4192 }
4193 }
4194 }
4195
4196 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4197 jint result = parse_vm_init_args(args);
4198 if (result != JNI_OK) {
4199 return result;
4200 }
4201
4202 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4203 SharedArchivePath = get_shared_archive_path();
4204 if (SharedArchivePath == NULL) {
4205 return JNI_ENOMEM;
4206 }
4207
4208 // Set up VerifySharedSpaces
4209 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4210 VerifySharedSpaces = true;
4211 }
4212
4213 // Delay warning until here so that we've had a chance to process
4214 // the -XX:-PrintWarnings flag
4215 if (needs_hotspotrc_warning) {
4216 warning("%s file is present but has been ignored. "
4217 "Run with -XX:Flags=%s to load the file.",
4218 hotspotrc, hotspotrc);
4219 }
4220
4221 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
4222 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4223 #endif
4224
4225 #if INCLUDE_ALL_GCS
4226 #if (defined JAVASE_EMBEDDED || defined ARM)
4227 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
4228 #endif
4229 #endif
4230
4231 #ifndef PRODUCT
4232 if (TraceBytecodesAt != 0) {
4233 TraceBytecodes = true;
4234 }
4235 if (CountCompiledCalls) {
4236 if (UseCounterDecay) {
4237 warning("UseCounterDecay disabled because CountCalls is set");
4238 UseCounterDecay = false;
4239 }
4240 }
4241 #endif // PRODUCT
4242
4243 // JSR 292 is not supported before 1.7
4244 if (!JDK_Version::is_gte_jdk17x_version()) {
4245 if (EnableInvokeDynamic) {
4246 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
4247 warning("JSR 292 is not supported before 1.7. Disabling support.");
4248 }
4249 EnableInvokeDynamic = false;
4250 }
4251 }
4252
4253 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
4254 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4255 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
4256 }
4257 ScavengeRootsInCode = 1;
4258 }
4259
4260 if (PrintGCDetails) {
4261 // Turn on -verbose:gc options as well
4262 PrintGC = true;
4263 }
4264
4265 if (!JDK_Version::is_gte_jdk18x_version()) {
4266 // To avoid changing the log format for 7 updates this flag is only
4267 // true by default in JDK8 and above.
4268 if (FLAG_IS_DEFAULT(PrintGCCause)) {
4269 FLAG_SET_DEFAULT(PrintGCCause, false);
4270 }
4271 }
4272
4273 // Set object alignment values.
4274 set_object_alignment();
4275
4276 #if !INCLUDE_ALL_GCS
4277 force_serial_gc();
4278 #endif // INCLUDE_ALL_GCS
4279 #if !INCLUDE_CDS
4280 if (DumpSharedSpaces || RequireSharedSpaces) {
4281 jio_fprintf(defaultStream::error_stream(),
4282 "Shared spaces are not supported in this VM\n");
4283 return JNI_ERR;
4284 }
4285 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4286 warning("Shared spaces are not supported in this VM");
4287 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4288 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4289 }
4290 no_shared_spaces("CDS Disabled");
4291 #endif // INCLUDE_CDS
4292
4293 return JNI_OK;
4294 }
4295
4296 jint Arguments::apply_ergo() {
4297
4298 // Set flags based on ergonomics.
4299 set_ergonomics_flags();
4300
4301 set_shared_spaces_flags();
4302
4303 #if defined(SPARC)
4304 // BIS instructions require 'membar' instruction regardless of the number
4305 // of CPUs because in virtualized/container environments which might use only 1
4306 // CPU, BIS instructions may produce incorrect results.
4307
4308 if (FLAG_IS_DEFAULT(AssumeMP)) {
4309 FLAG_SET_DEFAULT(AssumeMP, true);
4310 }
4311 #endif
4312
4313 // Check the GC selections again.
4314 if (!check_gc_consistency()) {
4315 return JNI_EINVAL;
4316 }
4317
4318 if (TieredCompilation) {
4319 set_tiered_flags();
4320 } else {
4321 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
4322 if (CompilationPolicyChoice >= 2) {
4323 vm_exit_during_initialization(
4324 "Incompatible compilation policy selected", NULL);
4325 }
4326 }
4327 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
4328 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4329 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
4330 }
4331
4332
4333 // Set heap size based on available physical memory
4334 set_heap_size();
4335
4336 ArgumentsExt::set_gc_specific_flags();
4337
4338 // Initialize Metaspace flags and alignments.
4339 Metaspace::ergo_initialize();
4340
4341 // Set bytecode rewriting flags
4342 set_bytecode_flags();
4343
4344 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
4345 set_aggressive_opts_flags();
4346
4347 // Turn off biased locking for locking debug mode flags,
4348 // which are subtlely different from each other but neither works with
4349 // biased locking.
4350 if (UseHeavyMonitors
4351 #ifdef COMPILER1
4352 || !UseFastLocking
4353 #endif // COMPILER1
4354 ) {
4355 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4356 // flag set to true on command line; warn the user that they
4357 // can't enable biased locking here
4358 warning("Biased Locking is not supported with locking debug flags"
4359 "; ignoring UseBiasedLocking flag." );
4360 }
4361 UseBiasedLocking = false;
4362 }
4363
4364 #ifdef ZERO
4365 // Clear flags not supported on zero.
4366 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4367 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4368 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4369 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4370 #endif // CC_INTERP
4371
4372 #ifdef COMPILER2
4373 if (!EliminateLocks) {
4374 EliminateNestedLocks = false;
4375 }
4376 if (!Inline) {
4377 IncrementalInline = false;
4378 }
4379 #ifndef PRODUCT
4380 if (!IncrementalInline) {
4381 AlwaysIncrementalInline = false;
4382 }
4383 #endif
4384 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
4385 // incremental inlining: bump MaxNodeLimit
4386 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
4387 }
4388 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4389 // nothing to use the profiling, turn if off
4390 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4391 }
4392 #endif
4393
4394 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4395 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4396 DebugNonSafepoints = true;
4397 }
4398
4399 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4400 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4401 }
4402
4403 if (UseOnStackReplacement && !UseLoopCounter) {
4404 warning("On-stack-replacement requires loop counters; enabling loop counters");
4405 FLAG_SET_DEFAULT(UseLoopCounter, true);
4406 }
4407
4408 #ifndef PRODUCT
4409 if (CompileTheWorld) {
4410 // Force NmethodSweeper to sweep whole CodeCache each time.
4411 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4412 NmethodSweepFraction = 1;
4413 }
4414 }
4415
4416 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4417 if (use_vm_log()) {
4418 LogVMOutput = true;
4419 }
4420 }
4421 #endif // PRODUCT
4422
4423 if (PrintCommandLineFlags) {
4424 CommandLineFlags::printSetFlags(tty);
4425 }
4426
4427 // Apply CPU specific policy for the BiasedLocking
4428 if (UseBiasedLocking) {
4429 if (!VM_Version::use_biased_locking() &&
4430 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4431 UseBiasedLocking = false;
4432 }
4433 }
4434 #ifdef COMPILER2
4435 if (!UseBiasedLocking || EmitSync != 0) {
4436 UseOptoBiasInlining = false;
4437 }
4438 #endif
4439
4440 // set PauseAtExit if the gamma launcher was used and a debugger is attached
4441 // but only if not already set on the commandline
4442 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
4443 bool set = false;
4444 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
4445 if (!set) {
4446 FLAG_SET_DEFAULT(PauseAtExit, true);
4447 }
4448 }
4449
4450 return JNI_OK;
4451 }
4452
4453 jint Arguments::adjust_after_os() {
4454 if (UseNUMA) {
4455 if (UseParallelGC || UseParallelOldGC) {
4456 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4457 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4458 }
4459 }
4460 // UseNUMAInterleaving is set to ON for all collectors and
4461 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4462 // such as the parallel collector for Linux and Solaris will
4463 // interleave old gen and survivor spaces on top of NUMA
4464 // allocation policy for the eden space.
4465 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4466 // all platforms and ParallelGC on Windows will interleave all
4467 // of the heap spaces across NUMA nodes.
4468 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4469 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4470 }
4471 }
4472 return JNI_OK;
4473 }
4474
4475 int Arguments::PropertyList_count(SystemProperty* pl) {
4476 int count = 0;
4477 while(pl != NULL) {
4478 count++;
4479 pl = pl->next();
4480 }
4481 return count;
4482 }
4483
4484 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4485 assert(key != NULL, "just checking");
4486 SystemProperty* prop;
4487 for (prop = pl; prop != NULL; prop = prop->next()) {
4488 if (strcmp(key, prop->key()) == 0) return prop->value();
4489 }
4490 return NULL;
4491 }
4492
4493 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4494 int count = 0;
4495 const char* ret_val = NULL;
4496
4497 while(pl != NULL) {
4498 if(count >= index) {
4499 ret_val = pl->key();
4500 break;
4501 }
4502 count++;
4503 pl = pl->next();
4504 }
4505
4506 return ret_val;
4507 }
4508
4509 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4510 int count = 0;
4511 char* ret_val = NULL;
4512
4513 while(pl != NULL) {
4514 if(count >= index) {
4515 ret_val = pl->value();
4516 break;
4517 }
4518 count++;
4519 pl = pl->next();
4520 }
4521
4522 return ret_val;
4523 }
4524
4525 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4526 SystemProperty* p = *plist;
4527 if (p == NULL) {
4528 *plist = new_p;
4529 } else {
4530 while (p->next() != NULL) {
4531 p = p->next();
4532 }
4533 p->set_next(new_p);
4534 }
4535 }
4536
4537 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4538 if (plist == NULL)
4539 return;
4540
4541 SystemProperty* new_p = new SystemProperty(k, v, true);
4542 PropertyList_add(plist, new_p);
4543 }
4544
4545 // This add maintains unique property key in the list.
4546 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4547 if (plist == NULL)
4548 return;
4549
4550 // If property key exist then update with new value.
4551 SystemProperty* prop;
4552 for (prop = *plist; prop != NULL; prop = prop->next()) {
4553 if (strcmp(k, prop->key()) == 0) {
4554 if (append) {
4555 prop->append_value(v);
4556 } else {
4557 prop->set_value(v);
4558 }
4559 return;
4560 }
4561 }
4562
4563 PropertyList_add(plist, k, v);
4564 }
4565
4566 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4567 // Returns true if all of the source pointed by src has been copied over to
4568 // the destination buffer pointed by buf. Otherwise, returns false.
4569 // Notes:
4570 // 1. If the length (buflen) of the destination buffer excluding the
4571 // NULL terminator character is not long enough for holding the expanded
4572 // pid characters, it also returns false instead of returning the partially
4573 // expanded one.
4574 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4575 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4576 char* buf, size_t buflen) {
4577 const char* p = src;
4578 char* b = buf;
4579 const char* src_end = &src[srclen];
4580 char* buf_end = &buf[buflen - 1];
4581
4582 while (p < src_end && b < buf_end) {
4583 if (*p == '%') {
4584 switch (*(++p)) {
4585 case '%': // "%%" ==> "%"
4586 *b++ = *p++;
4587 break;
4588 case 'p': { // "%p" ==> current process id
4589 // buf_end points to the character before the last character so
4590 // that we could write '\0' to the end of the buffer.
4591 size_t buf_sz = buf_end - b + 1;
4592 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4593
4594 // if jio_snprintf fails or the buffer is not long enough to hold
4595 // the expanded pid, returns false.
4596 if (ret < 0 || ret >= (int)buf_sz) {
4597 return false;
4598 } else {
4599 b += ret;
4600 assert(*b == '\0', "fail in copy_expand_pid");
4601 if (p == src_end && b == buf_end + 1) {
4602 // reach the end of the buffer.
4603 return true;
4604 }
4605 }
4606 p++;
4607 break;
4608 }
4609 default :
4610 *b++ = '%';
4611 }
4612 } else {
4613 *b++ = *p++;
4614 }
4615 }
4616 *b = '\0';
4617 return (p == src_end); // return false if not all of the source was copied
4618 }