1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "classfile/stringTable.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/globals_extension.hpp"
39 #include "runtime/java.hpp"
40 #include "services/management.hpp"
41 #include "services/memTracker.hpp"
42 #include "utilities/defaultStream.hpp"
43 #include "utilities/macros.hpp"
44 #include "utilities/taskqueue.hpp"
45 #ifdef TARGET_OS_FAMILY_linux
46 # include "os_linux.inline.hpp"
47 #endif
48 #ifdef TARGET_OS_FAMILY_solaris
49 # include "os_solaris.inline.hpp"
50 #endif
51 #ifdef TARGET_OS_FAMILY_windows
52 # include "os_windows.inline.hpp"
53 #endif
54 #ifdef TARGET_OS_FAMILY_aix
55 # include "os_aix.inline.hpp"
56 #endif
57 #ifdef TARGET_OS_FAMILY_bsd
58 # include "os_bsd.inline.hpp"
59 #endif
60 #if INCLUDE_ALL_GCS
61 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
62 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
63 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
64 #endif // INCLUDE_ALL_GCS
65
66 // Note: This is a special bug reporting site for the JVM
67 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
68 #define DEFAULT_JAVA_LAUNCHER "generic"
69
70 // Disable options not supported in this release, with a warning if they
71 // were explicitly requested on the command-line
72 #define UNSUPPORTED_OPTION(opt, description) \
73 do { \
74 if (opt) { \
75 if (FLAG_IS_CMDLINE(opt)) { \
76 warning(description " is disabled in this release."); \
77 } \
78 FLAG_SET_DEFAULT(opt, false); \
79 } \
80 } while(0)
81
82 #define UNSUPPORTED_GC_OPTION(gc) \
83 do { \
84 if (gc) { \
85 if (FLAG_IS_CMDLINE(gc)) { \
86 warning(#gc " is not supported in this VM. Using Serial GC."); \
87 } \
88 FLAG_SET_DEFAULT(gc, false); \
89 } \
90 } while(0)
91
92 char** Arguments::_jvm_flags_array = NULL;
93 int Arguments::_num_jvm_flags = 0;
94 char** Arguments::_jvm_args_array = NULL;
95 int Arguments::_num_jvm_args = 0;
96 char* Arguments::_java_command = NULL;
97 SystemProperty* Arguments::_system_properties = NULL;
98 const char* Arguments::_gc_log_filename = NULL;
99 bool Arguments::_has_profile = false;
100 size_t Arguments::_conservative_max_heap_alignment = 0;
101 uintx Arguments::_min_heap_size = 0;
102 Arguments::Mode Arguments::_mode = _mixed;
103 bool Arguments::_java_compiler = false;
104 bool Arguments::_xdebug_mode = false;
105 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
106 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
107 int Arguments::_sun_java_launcher_pid = -1;
108 bool Arguments::_sun_java_launcher_is_altjvm = false;
109
110 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
111 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
112 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
113 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
114 bool Arguments::_ClipInlining = ClipInlining;
115
116 char* Arguments::SharedArchivePath = NULL;
117
118 AgentLibraryList Arguments::_libraryList;
119 AgentLibraryList Arguments::_agentList;
120
121 abort_hook_t Arguments::_abort_hook = NULL;
122 exit_hook_t Arguments::_exit_hook = NULL;
123 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
124
125
126 SystemProperty *Arguments::_java_ext_dirs = NULL;
127 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
128 SystemProperty *Arguments::_sun_boot_library_path = NULL;
129 SystemProperty *Arguments::_java_library_path = NULL;
130 SystemProperty *Arguments::_java_home = NULL;
131 SystemProperty *Arguments::_java_class_path = NULL;
132 SystemProperty *Arguments::_sun_boot_class_path = NULL;
133
134 char* Arguments::_meta_index_path = NULL;
135 char* Arguments::_meta_index_dir = NULL;
136
137 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
138
139 static bool match_option(const JavaVMOption *option, const char* name,
140 const char** tail) {
141 int len = (int)strlen(name);
142 if (strncmp(option->optionString, name, len) == 0) {
143 *tail = option->optionString + len;
144 return true;
145 } else {
146 return false;
147 }
148 }
149
150 static void logOption(const char* opt) {
151 if (PrintVMOptions) {
152 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
153 }
154 }
155
156 // Process java launcher properties.
157 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
158 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
159 // sun.java.launcher.pid is defined.
160 // Must do this before setting up other system properties,
161 // as some of them may depend on launcher type.
162 for (int index = 0; index < args->nOptions; index++) {
163 const JavaVMOption* option = args->options + index;
164 const char* tail;
165
166 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
167 process_java_launcher_argument(tail, option->extraInfo);
168 continue;
169 }
170 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
171 if (strcmp(tail, "true") == 0) {
172 _sun_java_launcher_is_altjvm = true;
173 }
174 continue;
175 }
176 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
177 _sun_java_launcher_pid = atoi(tail);
178 continue;
179 }
180 }
181 }
182
183 // Initialize system properties key and value.
184 void Arguments::init_system_properties() {
185
186 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
187 "Java Virtual Machine Specification", false));
188 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
190 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
191
192 // Following are JVMTI agent writable properties.
193 // Properties values are set to NULL and they are
194 // os specific they are initialized in os::init_system_properties_values().
195 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
196 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
197 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
198 _java_library_path = new SystemProperty("java.library.path", NULL, true);
199 _java_home = new SystemProperty("java.home", NULL, true);
200 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
201
202 _java_class_path = new SystemProperty("java.class.path", "", true);
203
204 // Add to System Property list.
205 PropertyList_add(&_system_properties, _java_ext_dirs);
206 PropertyList_add(&_system_properties, _java_endorsed_dirs);
207 PropertyList_add(&_system_properties, _sun_boot_library_path);
208 PropertyList_add(&_system_properties, _java_library_path);
209 PropertyList_add(&_system_properties, _java_home);
210 PropertyList_add(&_system_properties, _java_class_path);
211 PropertyList_add(&_system_properties, _sun_boot_class_path);
212
213 // Set OS specific system properties values
214 os::init_system_properties_values();
215 }
216
217
218 // Update/Initialize System properties after JDK version number is known
219 void Arguments::init_version_specific_system_properties() {
220 enum { bufsz = 16 };
221 char buffer[bufsz];
222 const char* spec_vendor = "Sun Microsystems Inc.";
223 uint32_t spec_version = 0;
224
225 if (JDK_Version::is_gte_jdk17x_version()) {
226 spec_vendor = "Oracle Corporation";
227 spec_version = JDK_Version::current().major_version();
228 }
229 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
230
231 PropertyList_add(&_system_properties,
232 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
233 PropertyList_add(&_system_properties,
234 new SystemProperty("java.vm.specification.version", buffer, false));
235 PropertyList_add(&_system_properties,
236 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
237 }
238
239 /**
240 * Provide a slightly more user-friendly way of eliminating -XX flags.
241 * When a flag is eliminated, it can be added to this list in order to
242 * continue accepting this flag on the command-line, while issuing a warning
243 * and ignoring the value. Once the JDK version reaches the 'accept_until'
244 * limit, we flatly refuse to admit the existence of the flag. This allows
245 * a flag to die correctly over JDK releases using HSX.
246 */
247 typedef struct {
248 const char* name;
249 JDK_Version obsoleted_in; // when the flag went away
250 JDK_Version accept_until; // which version to start denying the existence
251 } ObsoleteFlag;
252
253 static ObsoleteFlag obsolete_jvm_flags[] = {
254 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
258 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
259 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
260 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
261 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
262 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
263 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
264 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
265 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
266 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
267 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
268 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
269 { "DefaultInitialRAMFraction",
270 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
271 { "UseDepthFirstScavengeOrder",
272 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
273 { "HandlePromotionFailure",
274 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
275 { "MaxLiveObjectEvacuationRatio",
276 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
277 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
278 { "UseParallelOldGCCompacting",
279 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
280 { "UseParallelDensePrefixUpdate",
281 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
282 { "UseParallelOldGCDensePrefix",
283 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
284 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
285 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
286 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
295 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
296 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
297 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
298 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
299 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
300 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
302 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
303 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
304 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
305 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
306 #ifdef PRODUCT
307 { "DesiredMethodLimit",
308 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
309 #endif // PRODUCT
310 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) },
311 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
312 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
313 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
314 { NULL, JDK_Version(0), JDK_Version(0) }
315 };
316
317 // Returns true if the flag is obsolete and fits into the range specified
318 // for being ignored. In the case that the flag is ignored, the 'version'
319 // value is filled in with the version number when the flag became
320 // obsolete so that that value can be displayed to the user.
321 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
322 int i = 0;
323 assert(version != NULL, "Must provide a version buffer");
324 while (obsolete_jvm_flags[i].name != NULL) {
325 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
326 // <flag>=xxx form
327 // [-|+]<flag> form
328 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
329 ((s[0] == '+' || s[0] == '-') &&
330 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
331 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
332 *version = flag_status.obsoleted_in;
333 return true;
334 }
335 }
336 i++;
337 }
338 return false;
339 }
340
341 // Constructs the system class path (aka boot class path) from the following
342 // components, in order:
343 //
344 // prefix // from -Xbootclasspath/p:...
345 // endorsed // the expansion of -Djava.endorsed.dirs=...
346 // base // from os::get_system_properties() or -Xbootclasspath=
347 // suffix // from -Xbootclasspath/a:...
348 //
349 // java.endorsed.dirs is a list of directories; any jar or zip files in the
350 // directories are added to the sysclasspath just before the base.
351 //
352 // This could be AllStatic, but it isn't needed after argument processing is
353 // complete.
354 class SysClassPath: public StackObj {
355 public:
356 SysClassPath(const char* base);
357 ~SysClassPath();
358
359 inline void set_base(const char* base);
360 inline void add_prefix(const char* prefix);
361 inline void add_suffix_to_prefix(const char* suffix);
362 inline void add_suffix(const char* suffix);
363 inline void reset_path(const char* base);
364
365 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
366 // property. Must be called after all command-line arguments have been
367 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
368 // combined_path().
369 void expand_endorsed();
370
371 inline const char* get_base() const { return _items[_scp_base]; }
372 inline const char* get_prefix() const { return _items[_scp_prefix]; }
373 inline const char* get_suffix() const { return _items[_scp_suffix]; }
374 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
375
376 // Combine all the components into a single c-heap-allocated string; caller
377 // must free the string if/when no longer needed.
378 char* combined_path();
379
380 private:
381 // Utility routines.
382 static char* add_to_path(const char* path, const char* str, bool prepend);
383 static char* add_jars_to_path(char* path, const char* directory);
384
385 inline void reset_item_at(int index);
386
387 // Array indices for the items that make up the sysclasspath. All except the
388 // base are allocated in the C heap and freed by this class.
389 enum {
390 _scp_prefix, // from -Xbootclasspath/p:...
391 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
392 _scp_base, // the default sysclasspath
393 _scp_suffix, // from -Xbootclasspath/a:...
394 _scp_nitems // the number of items, must be last.
395 };
396
397 const char* _items[_scp_nitems];
398 DEBUG_ONLY(bool _expansion_done;)
399 };
400
401 SysClassPath::SysClassPath(const char* base) {
402 memset(_items, 0, sizeof(_items));
403 _items[_scp_base] = base;
404 DEBUG_ONLY(_expansion_done = false;)
405 }
406
407 SysClassPath::~SysClassPath() {
408 // Free everything except the base.
409 for (int i = 0; i < _scp_nitems; ++i) {
410 if (i != _scp_base) reset_item_at(i);
411 }
412 DEBUG_ONLY(_expansion_done = false;)
413 }
414
415 inline void SysClassPath::set_base(const char* base) {
416 _items[_scp_base] = base;
417 }
418
419 inline void SysClassPath::add_prefix(const char* prefix) {
420 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
421 }
422
423 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
424 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
425 }
426
427 inline void SysClassPath::add_suffix(const char* suffix) {
428 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
429 }
430
431 inline void SysClassPath::reset_item_at(int index) {
432 assert(index < _scp_nitems && index != _scp_base, "just checking");
433 if (_items[index] != NULL) {
434 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
435 _items[index] = NULL;
436 }
437 }
438
439 inline void SysClassPath::reset_path(const char* base) {
440 // Clear the prefix and suffix.
441 reset_item_at(_scp_prefix);
442 reset_item_at(_scp_suffix);
443 set_base(base);
444 }
445
446 //------------------------------------------------------------------------------
447
448 void SysClassPath::expand_endorsed() {
449 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
450
451 const char* path = Arguments::get_property("java.endorsed.dirs");
452 if (path == NULL) {
453 path = Arguments::get_endorsed_dir();
454 assert(path != NULL, "no default for java.endorsed.dirs");
455 }
456
457 char* expanded_path = NULL;
458 const char separator = *os::path_separator();
459 const char* const end = path + strlen(path);
460 while (path < end) {
461 const char* tmp_end = strchr(path, separator);
462 if (tmp_end == NULL) {
463 expanded_path = add_jars_to_path(expanded_path, path);
464 path = end;
465 } else {
466 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
467 memcpy(dirpath, path, tmp_end - path);
468 dirpath[tmp_end - path] = '\0';
469 expanded_path = add_jars_to_path(expanded_path, dirpath);
470 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
471 path = tmp_end + 1;
472 }
473 }
474 _items[_scp_endorsed] = expanded_path;
475 DEBUG_ONLY(_expansion_done = true;)
476 }
477
478 // Combine the bootclasspath elements, some of which may be null, into a single
479 // c-heap-allocated string.
480 char* SysClassPath::combined_path() {
481 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
482 assert(_expansion_done, "must call expand_endorsed() first.");
483
484 size_t lengths[_scp_nitems];
485 size_t total_len = 0;
486
487 const char separator = *os::path_separator();
488
489 // Get the lengths.
490 int i;
491 for (i = 0; i < _scp_nitems; ++i) {
492 if (_items[i] != NULL) {
493 lengths[i] = strlen(_items[i]);
494 // Include space for the separator char (or a NULL for the last item).
495 total_len += lengths[i] + 1;
496 }
497 }
498 assert(total_len > 0, "empty sysclasspath not allowed");
499
500 // Copy the _items to a single string.
501 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
502 char* cp_tmp = cp;
503 for (i = 0; i < _scp_nitems; ++i) {
504 if (_items[i] != NULL) {
505 memcpy(cp_tmp, _items[i], lengths[i]);
506 cp_tmp += lengths[i];
507 *cp_tmp++ = separator;
508 }
509 }
510 *--cp_tmp = '\0'; // Replace the extra separator.
511 return cp;
512 }
513
514 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
515 char*
516 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
517 char *cp;
518
519 assert(str != NULL, "just checking");
520 if (path == NULL) {
521 size_t len = strlen(str) + 1;
522 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
523 memcpy(cp, str, len); // copy the trailing null
524 } else {
525 const char separator = *os::path_separator();
526 size_t old_len = strlen(path);
527 size_t str_len = strlen(str);
528 size_t len = old_len + str_len + 2;
529
530 if (prepend) {
531 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
532 char* cp_tmp = cp;
533 memcpy(cp_tmp, str, str_len);
534 cp_tmp += str_len;
535 *cp_tmp = separator;
536 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
537 FREE_C_HEAP_ARRAY(char, path, mtInternal);
538 } else {
539 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
540 char* cp_tmp = cp + old_len;
541 *cp_tmp = separator;
542 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
543 }
544 }
545 return cp;
546 }
547
548 // Scan the directory and append any jar or zip files found to path.
549 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
550 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
551 DIR* dir = os::opendir(directory);
552 if (dir == NULL) return path;
553
554 char dir_sep[2] = { '\0', '\0' };
555 size_t directory_len = strlen(directory);
556 const char fileSep = *os::file_separator();
557 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
558
559 /* Scan the directory for jars/zips, appending them to path. */
560 struct dirent *entry;
561 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
562 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
563 const char* name = entry->d_name;
564 const char* ext = name + strlen(name) - 4;
565 bool isJarOrZip = ext > name &&
566 (os::file_name_strcmp(ext, ".jar") == 0 ||
567 os::file_name_strcmp(ext, ".zip") == 0);
568 if (isJarOrZip) {
569 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
570 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
571 path = add_to_path(path, jarpath, false);
572 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
573 }
574 }
575 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
576 os::closedir(dir);
577 return path;
578 }
579
580 // Parses a memory size specification string.
581 static bool atomull(const char *s, julong* result) {
582 julong n = 0;
583 int args_read = sscanf(s, JULONG_FORMAT, &n);
584 if (args_read != 1) {
585 return false;
586 }
587 while (*s != '\0' && isdigit(*s)) {
588 s++;
589 }
590 // 4705540: illegal if more characters are found after the first non-digit
591 if (strlen(s) > 1) {
592 return false;
593 }
594 switch (*s) {
595 case 'T': case 't':
596 *result = n * G * K;
597 // Check for overflow.
598 if (*result/((julong)G * K) != n) return false;
599 return true;
600 case 'G': case 'g':
601 *result = n * G;
602 if (*result/G != n) return false;
603 return true;
604 case 'M': case 'm':
605 *result = n * M;
606 if (*result/M != n) return false;
607 return true;
608 case 'K': case 'k':
609 *result = n * K;
610 if (*result/K != n) return false;
611 return true;
612 case '\0':
613 *result = n;
614 return true;
615 default:
616 return false;
617 }
618 }
619
620 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
621 if (size < min_size) return arg_too_small;
622 // Check that size will fit in a size_t (only relevant on 32-bit)
623 if (size > max_uintx) return arg_too_big;
624 return arg_in_range;
625 }
626
627 // Describe an argument out of range error
628 void Arguments::describe_range_error(ArgsRange errcode) {
629 switch(errcode) {
630 case arg_too_big:
631 jio_fprintf(defaultStream::error_stream(),
632 "The specified size exceeds the maximum "
633 "representable size.\n");
634 break;
635 case arg_too_small:
636 case arg_unreadable:
637 case arg_in_range:
638 // do nothing for now
639 break;
640 default:
641 ShouldNotReachHere();
642 }
643 }
644
645 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
646 return CommandLineFlags::boolAtPut(name, &value, origin);
647 }
648
649 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
650 double v;
651 if (sscanf(value, "%lf", &v) != 1) {
652 return false;
653 }
654
655 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
656 return true;
657 }
658 return false;
659 }
660
661 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
662 julong v;
663 intx intx_v;
664 bool is_neg = false;
665 // Check the sign first since atomull() parses only unsigned values.
666 if (*value == '-') {
667 if (!CommandLineFlags::intxAt(name, &intx_v)) {
668 return false;
669 }
670 value++;
671 is_neg = true;
672 }
673 if (!atomull(value, &v)) {
674 return false;
675 }
676 intx_v = (intx) v;
677 if (is_neg) {
678 intx_v = -intx_v;
679 }
680 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
681 return true;
682 }
683 uintx uintx_v = (uintx) v;
684 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
685 return true;
686 }
687 uint64_t uint64_t_v = (uint64_t) v;
688 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
689 return true;
690 }
691 return false;
692 }
693
694 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
695 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
696 // Contract: CommandLineFlags always returns a pointer that needs freeing.
697 FREE_C_HEAP_ARRAY(char, value, mtInternal);
698 return true;
699 }
700
701 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
702 const char* old_value = "";
703 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
704 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
705 size_t new_len = strlen(new_value);
706 const char* value;
707 char* free_this_too = NULL;
708 if (old_len == 0) {
709 value = new_value;
710 } else if (new_len == 0) {
711 value = old_value;
712 } else {
713 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
714 // each new setting adds another LINE to the switch:
715 sprintf(buf, "%s\n%s", old_value, new_value);
716 value = buf;
717 free_this_too = buf;
718 }
719 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
720 // CommandLineFlags always returns a pointer that needs freeing.
721 FREE_C_HEAP_ARRAY(char, value, mtInternal);
722 if (free_this_too != NULL) {
723 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
724 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
725 }
726 return true;
727 }
728
729 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
730
731 // range of acceptable characters spelled out for portability reasons
732 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
733 #define BUFLEN 255
734 char name[BUFLEN+1];
735 char dummy;
736
737 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
738 return set_bool_flag(name, false, origin);
739 }
740 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
741 return set_bool_flag(name, true, origin);
742 }
743
744 char punct;
745 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
746 const char* value = strchr(arg, '=') + 1;
747 Flag* flag = Flag::find_flag(name, strlen(name));
748 if (flag != NULL && flag->is_ccstr()) {
749 if (flag->ccstr_accumulates()) {
750 return append_to_string_flag(name, value, origin);
751 } else {
752 if (value[0] == '\0') {
753 value = NULL;
754 }
755 return set_string_flag(name, value, origin);
756 }
757 }
758 }
759
760 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
761 const char* value = strchr(arg, '=') + 1;
762 // -XX:Foo:=xxx will reset the string flag to the given value.
763 if (value[0] == '\0') {
764 value = NULL;
765 }
766 return set_string_flag(name, value, origin);
767 }
768
769 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
770 #define SIGNED_NUMBER_RANGE "[-0123456789]"
771 #define NUMBER_RANGE "[0123456789]"
772 char value[BUFLEN + 1];
773 char value2[BUFLEN + 1];
774 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
775 // Looks like a floating-point number -- try again with more lenient format string
776 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
777 return set_fp_numeric_flag(name, value, origin);
778 }
779 }
780
781 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
782 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
783 return set_numeric_flag(name, value, origin);
784 }
785
786 return false;
787 }
788
789 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
790 assert(bldarray != NULL, "illegal argument");
791
792 if (arg == NULL) {
793 return;
794 }
795
796 int new_count = *count + 1;
797
798 // expand the array and add arg to the last element
799 if (*bldarray == NULL) {
800 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
801 } else {
802 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
803 }
804 (*bldarray)[*count] = strdup(arg);
805 *count = new_count;
806 }
807
808 void Arguments::build_jvm_args(const char* arg) {
809 add_string(&_jvm_args_array, &_num_jvm_args, arg);
810 }
811
812 void Arguments::build_jvm_flags(const char* arg) {
813 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
814 }
815
816 // utility function to return a string that concatenates all
817 // strings in a given char** array
818 const char* Arguments::build_resource_string(char** args, int count) {
819 if (args == NULL || count == 0) {
820 return NULL;
821 }
822 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
823 for (int i = 1; i < count; i++) {
824 length += strlen(args[i]) + 1; // add 1 for a space
825 }
826 char* s = NEW_RESOURCE_ARRAY(char, length);
827 strcpy(s, args[0]);
828 for (int j = 1; j < count; j++) {
829 strcat(s, " ");
830 strcat(s, args[j]);
831 }
832 return (const char*) s;
833 }
834
835 void Arguments::print_on(outputStream* st) {
836 st->print_cr("VM Arguments:");
837 if (num_jvm_flags() > 0) {
838 st->print("jvm_flags: "); print_jvm_flags_on(st);
839 }
840 if (num_jvm_args() > 0) {
841 st->print("jvm_args: "); print_jvm_args_on(st);
842 }
843 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
844 if (_java_class_path != NULL) {
845 char* path = _java_class_path->value();
846 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
847 }
848 st->print_cr("Launcher Type: %s", _sun_java_launcher);
849 }
850
851 void Arguments::print_jvm_flags_on(outputStream* st) {
852 if (_num_jvm_flags > 0) {
853 for (int i=0; i < _num_jvm_flags; i++) {
854 st->print("%s ", _jvm_flags_array[i]);
855 }
856 st->cr();
857 }
858 }
859
860 void Arguments::print_jvm_args_on(outputStream* st) {
861 if (_num_jvm_args > 0) {
862 for (int i=0; i < _num_jvm_args; i++) {
863 st->print("%s ", _jvm_args_array[i]);
864 }
865 st->cr();
866 }
867 }
868
869 bool Arguments::process_argument(const char* arg,
870 jboolean ignore_unrecognized, Flag::Flags origin) {
871
872 JDK_Version since = JDK_Version();
873
874 if (parse_argument(arg, origin) || ignore_unrecognized) {
875 return true;
876 }
877
878 bool has_plus_minus = (*arg == '+' || *arg == '-');
879 const char* const argname = has_plus_minus ? arg + 1 : arg;
880 if (is_newly_obsolete(arg, &since)) {
881 char version[256];
882 since.to_string(version, sizeof(version));
883 warning("ignoring option %s; support was removed in %s", argname, version);
884 return true;
885 }
886
887 // For locked flags, report a custom error message if available.
888 // Otherwise, report the standard unrecognized VM option.
889
890 size_t arg_len;
891 const char* equal_sign = strchr(argname, '=');
892 if (equal_sign == NULL) {
893 arg_len = strlen(argname);
894 } else {
895 arg_len = equal_sign - argname;
896 }
897
898 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
899 if (found_flag != NULL) {
900 char locked_message_buf[BUFLEN];
901 found_flag->get_locked_message(locked_message_buf, BUFLEN);
902 if (strlen(locked_message_buf) == 0) {
903 if (found_flag->is_bool() && !has_plus_minus) {
904 jio_fprintf(defaultStream::error_stream(),
905 "Missing +/- setting for VM option '%s'\n", argname);
906 } else if (!found_flag->is_bool() && has_plus_minus) {
907 jio_fprintf(defaultStream::error_stream(),
908 "Unexpected +/- setting in VM option '%s'\n", argname);
909 } else {
910 jio_fprintf(defaultStream::error_stream(),
911 "Improperly specified VM option '%s'\n", argname);
912 }
913 } else {
914 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
915 }
916 } else {
917 jio_fprintf(defaultStream::error_stream(),
918 "Unrecognized VM option '%s'\n", argname);
919 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
920 if (fuzzy_matched != NULL) {
921 jio_fprintf(defaultStream::error_stream(),
922 "Did you mean '%s%s%s'?\n",
923 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
924 fuzzy_matched->_name,
925 (fuzzy_matched->is_bool()) ? "" : "=<value>");
926 }
927 }
928
929 // allow for commandline "commenting out" options like -XX:#+Verbose
930 return arg[0] == '#';
931 }
932
933 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
934 FILE* stream = fopen(file_name, "rb");
935 if (stream == NULL) {
936 if (should_exist) {
937 jio_fprintf(defaultStream::error_stream(),
938 "Could not open settings file %s\n", file_name);
939 return false;
940 } else {
941 return true;
942 }
943 }
944
945 char token[1024];
946 int pos = 0;
947
948 bool in_white_space = true;
949 bool in_comment = false;
950 bool in_quote = false;
951 char quote_c = 0;
952 bool result = true;
953
954 int c = getc(stream);
955 while(c != EOF && pos < (int)(sizeof(token)-1)) {
956 if (in_white_space) {
957 if (in_comment) {
958 if (c == '\n') in_comment = false;
959 } else {
960 if (c == '#') in_comment = true;
961 else if (!isspace(c)) {
962 in_white_space = false;
963 token[pos++] = c;
964 }
965 }
966 } else {
967 if (c == '\n' || (!in_quote && isspace(c))) {
968 // token ends at newline, or at unquoted whitespace
969 // this allows a way to include spaces in string-valued options
970 token[pos] = '\0';
971 logOption(token);
972 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
973 build_jvm_flags(token);
974 pos = 0;
975 in_white_space = true;
976 in_quote = false;
977 } else if (!in_quote && (c == '\'' || c == '"')) {
978 in_quote = true;
979 quote_c = c;
980 } else if (in_quote && (c == quote_c)) {
981 in_quote = false;
982 } else {
983 token[pos++] = c;
984 }
985 }
986 c = getc(stream);
987 }
988 if (pos > 0) {
989 token[pos] = '\0';
990 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
991 build_jvm_flags(token);
992 }
993 fclose(stream);
994 return result;
995 }
996
997 //=============================================================================================================
998 // Parsing of properties (-D)
999
1000 const char* Arguments::get_property(const char* key) {
1001 return PropertyList_get_value(system_properties(), key);
1002 }
1003
1004 bool Arguments::add_property(const char* prop) {
1005 const char* eq = strchr(prop, '=');
1006 char* key;
1007 // ns must be static--its address may be stored in a SystemProperty object.
1008 const static char ns[1] = {0};
1009 char* value = (char *)ns;
1010
1011 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1012 key = AllocateHeap(key_len + 1, mtInternal);
1013 strncpy(key, prop, key_len);
1014 key[key_len] = '\0';
1015
1016 if (eq != NULL) {
1017 size_t value_len = strlen(prop) - key_len - 1;
1018 value = AllocateHeap(value_len + 1, mtInternal);
1019 strncpy(value, &prop[key_len + 1], value_len + 1);
1020 }
1021
1022 if (strcmp(key, "java.compiler") == 0) {
1023 process_java_compiler_argument(value);
1024 FreeHeap(key);
1025 if (eq != NULL) {
1026 FreeHeap(value);
1027 }
1028 return true;
1029 } else if (strcmp(key, "sun.java.command") == 0) {
1030 _java_command = value;
1031
1032 // Record value in Arguments, but let it get passed to Java.
1033 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1034 strcmp(key, "sun.java.launcher.pid") == 0) {
1035 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1036 // private and are processed in process_sun_java_launcher_properties();
1037 // the sun.java.launcher property is passed on to the java application
1038 FreeHeap(key);
1039 if (eq != NULL) {
1040 FreeHeap(value);
1041 }
1042 return true;
1043 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1044 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1045 // its value without going through the property list or making a Java call.
1046 _java_vendor_url_bug = value;
1047 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1048 PropertyList_unique_add(&_system_properties, key, value, true);
1049 return true;
1050 }
1051 // Create new property and add at the end of the list
1052 PropertyList_unique_add(&_system_properties, key, value);
1053 return true;
1054 }
1055
1056 //===========================================================================================================
1057 // Setting int/mixed/comp mode flags
1058
1059 void Arguments::set_mode_flags(Mode mode) {
1060 // Set up default values for all flags.
1061 // If you add a flag to any of the branches below,
1062 // add a default value for it here.
1063 set_java_compiler(false);
1064 _mode = mode;
1065
1066 // Ensure Agent_OnLoad has the correct initial values.
1067 // This may not be the final mode; mode may change later in onload phase.
1068 PropertyList_unique_add(&_system_properties, "java.vm.info",
1069 (char*)VM_Version::vm_info_string(), false);
1070
1071 UseInterpreter = true;
1072 UseCompiler = true;
1073 UseLoopCounter = true;
1074
1075 #ifndef ZERO
1076 // Turn these off for mixed and comp. Leave them on for Zero.
1077 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1078 UseFastAccessorMethods = (mode == _int);
1079 }
1080 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1081 UseFastEmptyMethods = (mode == _int);
1082 }
1083 #endif
1084
1085 // Default values may be platform/compiler dependent -
1086 // use the saved values
1087 ClipInlining = Arguments::_ClipInlining;
1088 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1089 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1090 BackgroundCompilation = Arguments::_BackgroundCompilation;
1091
1092 // Change from defaults based on mode
1093 switch (mode) {
1094 default:
1095 ShouldNotReachHere();
1096 break;
1097 case _int:
1098 UseCompiler = false;
1099 UseLoopCounter = false;
1100 AlwaysCompileLoopMethods = false;
1101 UseOnStackReplacement = false;
1102 break;
1103 case _mixed:
1104 // same as default
1105 break;
1106 case _comp:
1107 UseInterpreter = false;
1108 BackgroundCompilation = false;
1109 ClipInlining = false;
1110 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1111 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1112 // compile a level 4 (C2) and then continue executing it.
1113 if (TieredCompilation) {
1114 Tier3InvokeNotifyFreqLog = 0;
1115 Tier4InvocationThreshold = 0;
1116 }
1117 break;
1118 }
1119 }
1120
1121 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1122 // Conflict: required to use shared spaces (-Xshare:on), but
1123 // incompatible command line options were chosen.
1124
1125 static void no_shared_spaces() {
1126 if (RequireSharedSpaces) {
1127 jio_fprintf(defaultStream::error_stream(),
1128 "Class data sharing is inconsistent with other specified options.\n");
1129 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1130 } else {
1131 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1132 }
1133 }
1134 #endif
1135
1136 void Arguments::set_tiered_flags() {
1137 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1138 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1139 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1140 }
1141 if (CompilationPolicyChoice < 2) {
1142 vm_exit_during_initialization(
1143 "Incompatible compilation policy selected", NULL);
1144 }
1145 // Increase the code cache size - tiered compiles a lot more.
1146 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1147 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1148 }
1149 if (!UseInterpreter) { // -Xcomp
1150 Tier3InvokeNotifyFreqLog = 0;
1151 Tier4InvocationThreshold = 0;
1152 }
1153 }
1154
1155 #if INCLUDE_ALL_GCS
1156 static void disable_adaptive_size_policy(const char* collector_name) {
1157 if (UseAdaptiveSizePolicy) {
1158 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1159 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1160 collector_name);
1161 }
1162 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1163 }
1164 }
1165
1166 void Arguments::set_parnew_gc_flags() {
1167 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1168 "control point invariant");
1169 assert(UseParNewGC, "Error");
1170
1171 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1172 disable_adaptive_size_policy("UseParNewGC");
1173
1174 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1175 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1176 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1177 } else if (ParallelGCThreads == 0) {
1178 jio_fprintf(defaultStream::error_stream(),
1179 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1180 vm_exit(1);
1181 }
1182
1183 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1184 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1185 // we set them to 1024 and 1024.
1186 // See CR 6362902.
1187 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1188 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1189 }
1190 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1191 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1192 }
1193
1194 // When using compressed oops, we use local overflow stacks,
1195 // rather than using a global overflow list chained through
1196 // the klass word of the object's pre-image.
1197 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1198 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1199 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1200 }
1201 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1202 }
1203 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1204 }
1205
1206 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1207 // sparc/solaris for certain applications, but would gain from
1208 // further optimization and tuning efforts, and would almost
1209 // certainly gain from analysis of platform and environment.
1210 void Arguments::set_cms_and_parnew_gc_flags() {
1211 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1212 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1213
1214 // If we are using CMS, we prefer to UseParNewGC,
1215 // unless explicitly forbidden.
1216 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1217 FLAG_SET_ERGO(bool, UseParNewGC, true);
1218 }
1219
1220 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1221 disable_adaptive_size_policy("UseConcMarkSweepGC");
1222
1223 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1224 // as needed.
1225 if (UseParNewGC) {
1226 set_parnew_gc_flags();
1227 }
1228
1229 size_t max_heap = align_size_down(MaxHeapSize,
1230 CardTableRS::ct_max_alignment_constraint());
1231
1232 // Now make adjustments for CMS
1233 intx tenuring_default = (intx)6;
1234 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1235
1236 // Preferred young gen size for "short" pauses:
1237 // upper bound depends on # of threads and NewRatio.
1238 const uintx parallel_gc_threads =
1239 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1240 const size_t preferred_max_new_size_unaligned =
1241 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1242 size_t preferred_max_new_size =
1243 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1244
1245 // Unless explicitly requested otherwise, size young gen
1246 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1247
1248 // If either MaxNewSize or NewRatio is set on the command line,
1249 // assume the user is trying to set the size of the young gen.
1250 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1251
1252 // Set MaxNewSize to our calculated preferred_max_new_size unless
1253 // NewSize was set on the command line and it is larger than
1254 // preferred_max_new_size.
1255 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1256 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1257 } else {
1258 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1259 }
1260 if (PrintGCDetails && Verbose) {
1261 // Too early to use gclog_or_tty
1262 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1263 }
1264
1265 // Code along this path potentially sets NewSize and OldSize
1266 if (PrintGCDetails && Verbose) {
1267 // Too early to use gclog_or_tty
1268 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1269 " initial_heap_size: " SIZE_FORMAT
1270 " max_heap: " SIZE_FORMAT,
1271 min_heap_size(), InitialHeapSize, max_heap);
1272 }
1273 size_t min_new = preferred_max_new_size;
1274 if (FLAG_IS_CMDLINE(NewSize)) {
1275 min_new = NewSize;
1276 }
1277 if (max_heap > min_new && min_heap_size() > min_new) {
1278 // Unless explicitly requested otherwise, make young gen
1279 // at least min_new, and at most preferred_max_new_size.
1280 if (FLAG_IS_DEFAULT(NewSize)) {
1281 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1282 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1283 if (PrintGCDetails && Verbose) {
1284 // Too early to use gclog_or_tty
1285 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1286 }
1287 }
1288 // Unless explicitly requested otherwise, size old gen
1289 // so it's NewRatio x of NewSize.
1290 if (FLAG_IS_DEFAULT(OldSize)) {
1291 if (max_heap > NewSize) {
1292 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1293 if (PrintGCDetails && Verbose) {
1294 // Too early to use gclog_or_tty
1295 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1296 }
1297 }
1298 }
1299 }
1300 }
1301 // Unless explicitly requested otherwise, definitely
1302 // promote all objects surviving "tenuring_default" scavenges.
1303 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1304 FLAG_IS_DEFAULT(SurvivorRatio)) {
1305 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1306 }
1307 // If we decided above (or user explicitly requested)
1308 // `promote all' (via MaxTenuringThreshold := 0),
1309 // prefer minuscule survivor spaces so as not to waste
1310 // space for (non-existent) survivors
1311 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1312 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1313 }
1314 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1315 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1316 // This is done in order to make ParNew+CMS configuration to work
1317 // with YoungPLABSize and OldPLABSize options.
1318 // See CR 6362902.
1319 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1320 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1321 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1322 // is. In this situation let CMSParPromoteBlocksToClaim follow
1323 // the value (either from the command line or ergonomics) of
1324 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1325 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1326 } else {
1327 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1328 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1329 // we'll let it to take precedence.
1330 jio_fprintf(defaultStream::error_stream(),
1331 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1332 " options are specified for the CMS collector."
1333 " CMSParPromoteBlocksToClaim will take precedence.\n");
1334 }
1335 }
1336 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1337 // OldPLAB sizing manually turned off: Use a larger default setting,
1338 // unless it was manually specified. This is because a too-low value
1339 // will slow down scavenges.
1340 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1341 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1342 }
1343 }
1344 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1345 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1346 // If either of the static initialization defaults have changed, note this
1347 // modification.
1348 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1349 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1350 }
1351 if (PrintGCDetails && Verbose) {
1352 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1353 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1354 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1355 }
1356 }
1357 #endif // INCLUDE_ALL_GCS
1358
1359 void set_object_alignment() {
1360 // Object alignment.
1361 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1362 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1363 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1364 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1365 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1366 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1367
1368 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1369 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1370
1371 // Oop encoding heap max
1372 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1373
1374 #if INCLUDE_ALL_GCS
1375 // Set CMS global values
1376 CompactibleFreeListSpace::set_cms_values();
1377 #endif // INCLUDE_ALL_GCS
1378 }
1379
1380 bool verify_object_alignment() {
1381 // Object alignment.
1382 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1383 jio_fprintf(defaultStream::error_stream(),
1384 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1385 (int)ObjectAlignmentInBytes);
1386 return false;
1387 }
1388 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1389 jio_fprintf(defaultStream::error_stream(),
1390 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1391 (int)ObjectAlignmentInBytes, BytesPerLong);
1392 return false;
1393 }
1394 // It does not make sense to have big object alignment
1395 // since a space lost due to alignment will be greater
1396 // then a saved space from compressed oops.
1397 if ((int)ObjectAlignmentInBytes > 256) {
1398 jio_fprintf(defaultStream::error_stream(),
1399 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1400 (int)ObjectAlignmentInBytes);
1401 return false;
1402 }
1403 // In case page size is very small.
1404 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1405 jio_fprintf(defaultStream::error_stream(),
1406 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1407 (int)ObjectAlignmentInBytes, os::vm_page_size());
1408 return false;
1409 }
1410 return true;
1411 }
1412
1413 uintx Arguments::max_heap_for_compressed_oops() {
1414 // Avoid sign flip.
1415 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1416 // We need to fit both the NULL page and the heap into the memory budget, while
1417 // keeping alignment constraints of the heap. To guarantee the latter, as the
1418 // NULL page is located before the heap, we pad the NULL page to the conservative
1419 // maximum alignment that the GC may ever impose upon the heap.
1420 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1421 _conservative_max_heap_alignment);
1422
1423 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1424 NOT_LP64(ShouldNotReachHere(); return 0);
1425 }
1426
1427 bool Arguments::should_auto_select_low_pause_collector() {
1428 if (UseAutoGCSelectPolicy &&
1429 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1430 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1431 if (PrintGCDetails) {
1432 // Cannot use gclog_or_tty yet.
1433 tty->print_cr("Automatic selection of the low pause collector"
1434 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1435 }
1436 return true;
1437 }
1438 return false;
1439 }
1440
1441 void Arguments::set_use_compressed_oops() {
1442 #ifndef ZERO
1443 #ifdef _LP64
1444 // MaxHeapSize is not set up properly at this point, but
1445 // the only value that can override MaxHeapSize if we are
1446 // to use UseCompressedOops is InitialHeapSize.
1447 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1448
1449 if (max_heap_size <= max_heap_for_compressed_oops()) {
1450 #if !defined(COMPILER1) || defined(TIERED)
1451 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1452 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1453 }
1454 #endif
1455 #ifdef _WIN64
1456 if (UseLargePages && UseCompressedOops) {
1457 // Cannot allocate guard pages for implicit checks in indexed addressing
1458 // mode, when large pages are specified on windows.
1459 // This flag could be switched ON if narrow oop base address is set to 0,
1460 // see code in Universe::initialize_heap().
1461 Universe::set_narrow_oop_use_implicit_null_checks(false);
1462 }
1463 #endif // _WIN64
1464 } else {
1465 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1466 warning("Max heap size too large for Compressed Oops");
1467 FLAG_SET_DEFAULT(UseCompressedOops, false);
1468 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1469 }
1470 }
1471 #endif // _LP64
1472 #endif // ZERO
1473 }
1474
1475
1476 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1477 // set_use_compressed_oops().
1478 void Arguments::set_use_compressed_klass_ptrs() {
1479 #ifndef ZERO
1480 #ifdef _LP64
1481 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1482 if (!UseCompressedOops) {
1483 if (UseCompressedClassPointers) {
1484 warning("UseCompressedClassPointers requires UseCompressedOops");
1485 }
1486 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1487 } else {
1488 // Turn on UseCompressedClassPointers too
1489 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1490 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1491 }
1492 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1493 if (UseCompressedClassPointers) {
1494 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1495 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1496 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1497 }
1498 }
1499 }
1500 #endif // _LP64
1501 #endif // !ZERO
1502 }
1503
1504 void Arguments::set_conservative_max_heap_alignment() {
1505 // The conservative maximum required alignment for the heap is the maximum of
1506 // the alignments imposed by several sources: any requirements from the heap
1507 // itself, the collector policy and the maximum page size we may run the VM
1508 // with.
1509 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1510 #if INCLUDE_ALL_GCS
1511 if (UseParallelGC) {
1512 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1513 } else if (UseG1GC) {
1514 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1515 }
1516 #endif // INCLUDE_ALL_GCS
1517 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(),
1518 CollectorPolicy::compute_heap_alignment());
1519 }
1520
1521 void Arguments::set_ergonomics_flags() {
1522
1523 if (os::is_server_class_machine()) {
1524 // If no other collector is requested explicitly,
1525 // let the VM select the collector based on
1526 // machine class and automatic selection policy.
1527 if (!UseSerialGC &&
1528 !UseConcMarkSweepGC &&
1529 !UseG1GC &&
1530 !UseParNewGC &&
1531 FLAG_IS_DEFAULT(UseParallelGC)) {
1532 if (should_auto_select_low_pause_collector()) {
1533 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1534 } else {
1535 FLAG_SET_ERGO(bool, UseParallelGC, true);
1536 }
1537 }
1538 }
1539 #ifdef COMPILER2
1540 // Shared spaces work fine with other GCs but causes bytecode rewriting
1541 // to be disabled, which hurts interpreter performance and decreases
1542 // server performance. When -server is specified, keep the default off
1543 // unless it is asked for. Future work: either add bytecode rewriting
1544 // at link time, or rewrite bytecodes in non-shared methods.
1545 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1546 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1547 no_shared_spaces();
1548 }
1549 #endif
1550
1551 set_conservative_max_heap_alignment();
1552
1553 #ifndef ZERO
1554 #ifdef _LP64
1555 set_use_compressed_oops();
1556
1557 // set_use_compressed_klass_ptrs() must be called after calling
1558 // set_use_compressed_oops().
1559 set_use_compressed_klass_ptrs();
1560
1561 // Also checks that certain machines are slower with compressed oops
1562 // in vm_version initialization code.
1563 #endif // _LP64
1564 #endif // !ZERO
1565 }
1566
1567 void Arguments::set_parallel_gc_flags() {
1568 assert(UseParallelGC || UseParallelOldGC, "Error");
1569 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1570 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1571 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1572 }
1573 FLAG_SET_DEFAULT(UseParallelGC, true);
1574
1575 // If no heap maximum was requested explicitly, use some reasonable fraction
1576 // of the physical memory, up to a maximum of 1GB.
1577 FLAG_SET_DEFAULT(ParallelGCThreads,
1578 Abstract_VM_Version::parallel_worker_threads());
1579 if (ParallelGCThreads == 0) {
1580 jio_fprintf(defaultStream::error_stream(),
1581 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1582 vm_exit(1);
1583 }
1584
1585 if (UseAdaptiveSizePolicy) {
1586 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1587 // unless the user actually sets these flags.
1588 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1589 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1590 }
1591 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1592 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1593 }
1594 }
1595
1596 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1597 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1598 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1599 // See CR 6362902 for details.
1600 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1601 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1602 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1603 }
1604 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1605 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1606 }
1607 }
1608
1609 if (UseParallelOldGC) {
1610 // Par compact uses lower default values since they are treated as
1611 // minimums. These are different defaults because of the different
1612 // interpretation and are not ergonomically set.
1613 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1614 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1615 }
1616 }
1617 }
1618
1619 void Arguments::set_g1_gc_flags() {
1620 assert(UseG1GC, "Error");
1621 #ifdef COMPILER1
1622 FastTLABRefill = false;
1623 #endif
1624 FLAG_SET_DEFAULT(ParallelGCThreads,
1625 Abstract_VM_Version::parallel_worker_threads());
1626 if (ParallelGCThreads == 0) {
1627 FLAG_SET_DEFAULT(ParallelGCThreads,
1628 Abstract_VM_Version::parallel_worker_threads());
1629 }
1630
1631 // MarkStackSize will be set (if it hasn't been set by the user)
1632 // when concurrent marking is initialized.
1633 // Its value will be based upon the number of parallel marking threads.
1634 // But we do set the maximum mark stack size here.
1635 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1636 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1637 }
1638
1639 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1640 // In G1, we want the default GC overhead goal to be higher than
1641 // say in PS. So we set it here to 10%. Otherwise the heap might
1642 // be expanded more aggressively than we would like it to. In
1643 // fact, even 10% seems to not be high enough in some cases
1644 // (especially small GC stress tests that the main thing they do
1645 // is allocation). We might consider increase it further.
1646 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1647 }
1648
1649 if (PrintGCDetails && Verbose) {
1650 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1651 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1652 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1653 }
1654 }
1655
1656 julong Arguments::limit_by_allocatable_memory(julong limit) {
1657 julong max_allocatable;
1658 julong result = limit;
1659 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1660 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1661 }
1662 return result;
1663 }
1664
1665 // Use static initialization to get the default before parsing
1666 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1667
1668 void Arguments::set_heap_size() {
1669 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1670 // Deprecated flag
1671 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1672 }
1673
1674 const julong phys_mem =
1675 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1676 : (julong)MaxRAM;
1677
1678 // If the maximum heap size has not been set with -Xmx,
1679 // then set it as fraction of the size of physical memory,
1680 // respecting the maximum and minimum sizes of the heap.
1681 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1682 julong reasonable_max = phys_mem / MaxRAMFraction;
1683
1684 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1685 // Small physical memory, so use a minimum fraction of it for the heap
1686 reasonable_max = phys_mem / MinRAMFraction;
1687 } else {
1688 // Not-small physical memory, so require a heap at least
1689 // as large as MaxHeapSize
1690 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1691 }
1692 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1693 // Limit the heap size to ErgoHeapSizeLimit
1694 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1695 }
1696 if (UseCompressedOops) {
1697 // Limit the heap size to the maximum possible when using compressed oops
1698 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1699
1700 // HeapBaseMinAddress can be greater than default but not less than.
1701 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1702 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1703 // matches compressed oops printing flags
1704 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1705 jio_fprintf(defaultStream::error_stream(),
1706 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1707 " (" UINTX_FORMAT "G) which is greater than value given "
1708 UINTX_FORMAT "\n",
1709 DefaultHeapBaseMinAddress,
1710 DefaultHeapBaseMinAddress/G,
1711 HeapBaseMinAddress);
1712 }
1713 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1714 }
1715 }
1716
1717 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1718 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1719 // but it should be not less than default MaxHeapSize.
1720 max_coop_heap -= HeapBaseMinAddress;
1721 }
1722 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1723 }
1724 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1725
1726 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1727 // An initial heap size was specified on the command line,
1728 // so be sure that the maximum size is consistent. Done
1729 // after call to limit_by_allocatable_memory because that
1730 // method might reduce the allocation size.
1731 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1732 }
1733
1734 if (PrintGCDetails && Verbose) {
1735 // Cannot use gclog_or_tty yet.
1736 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1737 }
1738 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1739 }
1740
1741 // If the minimum or initial heap_size have not been set or requested to be set
1742 // ergonomically, set them accordingly.
1743 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1744 julong reasonable_minimum = (julong)(OldSize + NewSize);
1745
1746 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1747
1748 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1749
1750 if (InitialHeapSize == 0) {
1751 julong reasonable_initial = phys_mem / InitialRAMFraction;
1752
1753 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1754 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1755
1756 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1757
1758 if (PrintGCDetails && Verbose) {
1759 // Cannot use gclog_or_tty yet.
1760 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1761 }
1762 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1763 }
1764 // If the minimum heap size has not been set (via -Xms),
1765 // synchronize with InitialHeapSize to avoid errors with the default value.
1766 if (min_heap_size() == 0) {
1767 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1768 if (PrintGCDetails && Verbose) {
1769 // Cannot use gclog_or_tty yet.
1770 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1771 }
1772 }
1773 }
1774 }
1775
1776 // This must be called after ergonomics because we want bytecode rewriting
1777 // if the server compiler is used, or if UseSharedSpaces is disabled.
1778 void Arguments::set_bytecode_flags() {
1779 // Better not attempt to store into a read-only space.
1780 if (UseSharedSpaces) {
1781 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1782 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1783 }
1784
1785 if (!RewriteBytecodes) {
1786 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1787 }
1788 }
1789
1790 // Aggressive optimization flags -XX:+AggressiveOpts
1791 void Arguments::set_aggressive_opts_flags() {
1792 #ifdef COMPILER2
1793 if (AggressiveUnboxing) {
1794 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1795 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1796 } else if (!EliminateAutoBox) {
1797 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1798 AggressiveUnboxing = false;
1799 }
1800 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1801 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1802 } else if (!DoEscapeAnalysis) {
1803 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1804 AggressiveUnboxing = false;
1805 }
1806 }
1807 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1808 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1809 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1810 }
1811 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1812 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1813 }
1814
1815 // Feed the cache size setting into the JDK
1816 char buffer[1024];
1817 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1818 add_property(buffer);
1819 }
1820 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1821 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1822 }
1823 #endif
1824
1825 if (AggressiveOpts) {
1826 // Sample flag setting code
1827 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1828 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1829 // }
1830 }
1831 }
1832
1833 //===========================================================================================================
1834 // Parsing of java.compiler property
1835
1836 void Arguments::process_java_compiler_argument(char* arg) {
1837 // For backwards compatibility, Djava.compiler=NONE or ""
1838 // causes us to switch to -Xint mode UNLESS -Xdebug
1839 // is also specified.
1840 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1841 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1842 }
1843 }
1844
1845 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1846 _sun_java_launcher = strdup(launcher);
1847 }
1848
1849 bool Arguments::created_by_java_launcher() {
1850 assert(_sun_java_launcher != NULL, "property must have value");
1851 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1852 }
1853
1854 bool Arguments::sun_java_launcher_is_altjvm() {
1855 return _sun_java_launcher_is_altjvm;
1856 }
1857
1858 //===========================================================================================================
1859 // Parsing of main arguments
1860
1861 bool Arguments::verify_interval(uintx val, uintx min,
1862 uintx max, const char* name) {
1863 // Returns true iff value is in the inclusive interval [min..max]
1864 // false, otherwise.
1865 if (val >= min && val <= max) {
1866 return true;
1867 }
1868 jio_fprintf(defaultStream::error_stream(),
1869 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1870 " and " UINTX_FORMAT "\n",
1871 name, val, min, max);
1872 return false;
1873 }
1874
1875 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1876 // Returns true if given value is at least specified min threshold
1877 // false, otherwise.
1878 if (val >= min ) {
1879 return true;
1880 }
1881 jio_fprintf(defaultStream::error_stream(),
1882 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1883 name, val, min);
1884 return false;
1885 }
1886
1887 bool Arguments::verify_percentage(uintx value, const char* name) {
1888 if (is_percentage(value)) {
1889 return true;
1890 }
1891 jio_fprintf(defaultStream::error_stream(),
1892 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1893 name, value);
1894 return false;
1895 }
1896
1897 #if !INCLUDE_ALL_GCS
1898 #ifdef ASSERT
1899 static bool verify_serial_gc_flags() {
1900 return (UseSerialGC &&
1901 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1902 UseParallelGC || UseParallelOldGC));
1903 }
1904 #endif // ASSERT
1905 #endif // INCLUDE_ALL_GCS
1906
1907 // check if do gclog rotation
1908 // +UseGCLogFileRotation is a must,
1909 // no gc log rotation when log file not supplied or
1910 // NumberOfGCLogFiles is 0
1911 void check_gclog_consistency() {
1912 if (UseGCLogFileRotation) {
1913 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1914 jio_fprintf(defaultStream::output_stream(),
1915 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1916 "where num_of_file > 0\n"
1917 "GC log rotation is turned off\n");
1918 UseGCLogFileRotation = false;
1919 }
1920 }
1921
1922 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1923 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1924 jio_fprintf(defaultStream::output_stream(),
1925 "GCLogFileSize changed to minimum 8K\n");
1926 }
1927 }
1928
1929 // This function is called for -Xloggc:<filename>, it can be used
1930 // to check if a given file name(or string) conforms to the following
1931 // specification:
1932 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1933 // %p and %t only allowed once. We only limit usage of filename not path
1934 bool is_filename_valid(const char *file_name) {
1935 const char* p = file_name;
1936 char file_sep = os::file_separator()[0];
1937 const char* cp;
1938 // skip prefix path
1939 for (cp = file_name; *cp != '\0'; cp++) {
1940 if (*cp == '/' || *cp == file_sep) {
1941 p = cp + 1;
1942 }
1943 }
1944
1945 int count_p = 0;
1946 int count_t = 0;
1947 while (*p != '\0') {
1948 if ((*p >= '0' && *p <= '9') ||
1949 (*p >= 'A' && *p <= 'Z') ||
1950 (*p >= 'a' && *p <= 'z') ||
1951 *p == '-' ||
1952 *p == '_' ||
1953 *p == '.') {
1954 p++;
1955 continue;
1956 }
1957 if (*p == '%') {
1958 if(*(p + 1) == 'p') {
1959 p += 2;
1960 count_p ++;
1961 continue;
1962 }
1963 if (*(p + 1) == 't') {
1964 p += 2;
1965 count_t ++;
1966 continue;
1967 }
1968 }
1969 return false;
1970 }
1971 return count_p < 2 && count_t < 2;
1972 }
1973
1974 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
1975 if (!is_percentage(min_heap_free_ratio)) {
1976 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
1977 return false;
1978 }
1979 if (min_heap_free_ratio > MaxHeapFreeRatio) {
1980 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1981 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
1982 MaxHeapFreeRatio);
1983 return false;
1984 }
1985 return true;
1986 }
1987
1988 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
1989 if (!is_percentage(max_heap_free_ratio)) {
1990 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
1991 return false;
1992 }
1993 if (max_heap_free_ratio < MinHeapFreeRatio) {
1994 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
1995 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
1996 MinHeapFreeRatio);
1997 return false;
1998 }
1999 return true;
2000 }
2001
2002 // Check consistency of GC selection
2003 bool Arguments::check_gc_consistency() {
2004 check_gclog_consistency();
2005 bool status = true;
2006 // Ensure that the user has not selected conflicting sets
2007 // of collectors. [Note: this check is merely a user convenience;
2008 // collectors over-ride each other so that only a non-conflicting
2009 // set is selected; however what the user gets is not what they
2010 // may have expected from the combination they asked for. It's
2011 // better to reduce user confusion by not allowing them to
2012 // select conflicting combinations.
2013 uint i = 0;
2014 if (UseSerialGC) i++;
2015 if (UseConcMarkSweepGC || UseParNewGC) i++;
2016 if (UseParallelGC || UseParallelOldGC) i++;
2017 if (UseG1GC) i++;
2018 if (i > 1) {
2019 jio_fprintf(defaultStream::error_stream(),
2020 "Conflicting collector combinations in option list; "
2021 "please refer to the release notes for the combinations "
2022 "allowed\n");
2023 status = false;
2024 }
2025 return status;
2026 }
2027
2028 void Arguments::check_deprecated_gcs() {
2029 if (UseConcMarkSweepGC && !UseParNewGC) {
2030 warning("Using the DefNew young collector with the CMS collector is deprecated "
2031 "and will likely be removed in a future release");
2032 }
2033
2034 if (UseParNewGC && !UseConcMarkSweepGC) {
2035 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2036 // set up UseSerialGC properly, so that can't be used in the check here.
2037 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2038 "and will likely be removed in a future release");
2039 }
2040
2041 if (CMSIncrementalMode) {
2042 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2043 }
2044 }
2045
2046 void Arguments::check_deprecated_gc_flags() {
2047 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2048 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2049 "and will likely be removed in future release");
2050 }
2051 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2052 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2053 "Use MaxRAMFraction instead.");
2054 }
2055 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2056 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2057 }
2058 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2059 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2060 }
2061 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2062 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2063 }
2064 }
2065
2066 // Check stack pages settings
2067 bool Arguments::check_stack_pages()
2068 {
2069 bool status = true;
2070 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2071 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2072 // greater stack shadow pages can't generate instruction to bang stack
2073 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2074 return status;
2075 }
2076
2077 // Check the consistency of vm_init_args
2078 bool Arguments::check_vm_args_consistency() {
2079 // Method for adding checks for flag consistency.
2080 // The intent is to warn the user of all possible conflicts,
2081 // before returning an error.
2082 // Note: Needs platform-dependent factoring.
2083 bool status = true;
2084
2085 if (TLABRefillWasteFraction == 0) {
2086 jio_fprintf(defaultStream::error_stream(),
2087 "TLABRefillWasteFraction should be a denominator, "
2088 "not " SIZE_FORMAT "\n",
2089 TLABRefillWasteFraction);
2090 status = false;
2091 }
2092
2093 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2094 "AdaptiveSizePolicyWeight");
2095 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2096
2097 // Divide by bucket size to prevent a large size from causing rollover when
2098 // calculating amount of memory needed to be allocated for the String table.
2099 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2100 (max_uintx / StringTable::bucket_size()), "StringTable size");
2101
2102 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2103 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2104
2105 {
2106 // Using "else if" below to avoid printing two error messages if min > max.
2107 // This will also prevent us from reporting both min>100 and max>100 at the
2108 // same time, but that is less annoying than printing two identical errors IMHO.
2109 FormatBuffer<80> err_msg("%s","");
2110 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2111 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2112 status = false;
2113 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2114 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2115 status = false;
2116 }
2117 }
2118
2119 // Min/MaxMetaspaceFreeRatio
2120 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2121 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2122
2123 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2124 jio_fprintf(defaultStream::error_stream(),
2125 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2126 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2127 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2128 MinMetaspaceFreeRatio,
2129 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2130 MaxMetaspaceFreeRatio);
2131 status = false;
2132 }
2133
2134 // Trying to keep 100% free is not practical
2135 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2136
2137 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2138 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2139 }
2140
2141 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2142 // Settings to encourage splitting.
2143 if (!FLAG_IS_CMDLINE(NewRatio)) {
2144 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2145 }
2146 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2147 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2148 }
2149 }
2150
2151 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2152 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2153 if (GCTimeLimit == 100) {
2154 // Turn off gc-overhead-limit-exceeded checks
2155 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2156 }
2157
2158 status = status && check_gc_consistency();
2159 status = status && check_stack_pages();
2160
2161 if (CMSIncrementalMode) {
2162 if (!UseConcMarkSweepGC) {
2163 jio_fprintf(defaultStream::error_stream(),
2164 "error: invalid argument combination.\n"
2165 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2166 "selected in order\nto use CMSIncrementalMode.\n");
2167 status = false;
2168 } else {
2169 status = status && verify_percentage(CMSIncrementalDutyCycle,
2170 "CMSIncrementalDutyCycle");
2171 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2172 "CMSIncrementalDutyCycleMin");
2173 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2174 "CMSIncrementalSafetyFactor");
2175 status = status && verify_percentage(CMSIncrementalOffset,
2176 "CMSIncrementalOffset");
2177 status = status && verify_percentage(CMSExpAvgFactor,
2178 "CMSExpAvgFactor");
2179 // If it was not set on the command line, set
2180 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2181 if (CMSInitiatingOccupancyFraction < 0) {
2182 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2183 }
2184 }
2185 }
2186
2187 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2188 // insists that we hold the requisite locks so that the iteration is
2189 // MT-safe. For the verification at start-up and shut-down, we don't
2190 // yet have a good way of acquiring and releasing these locks,
2191 // which are not visible at the CollectedHeap level. We want to
2192 // be able to acquire these locks and then do the iteration rather
2193 // than just disable the lock verification. This will be fixed under
2194 // bug 4788986.
2195 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2196 if (VerifyDuringStartup) {
2197 warning("Heap verification at start-up disabled "
2198 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2199 VerifyDuringStartup = false; // Disable verification at start-up
2200 }
2201
2202 if (VerifyBeforeExit) {
2203 warning("Heap verification at shutdown disabled "
2204 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2205 VerifyBeforeExit = false; // Disable verification at shutdown
2206 }
2207 }
2208
2209 // Note: only executed in non-PRODUCT mode
2210 if (!UseAsyncConcMarkSweepGC &&
2211 (ExplicitGCInvokesConcurrent ||
2212 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2213 jio_fprintf(defaultStream::error_stream(),
2214 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2215 " with -UseAsyncConcMarkSweepGC");
2216 status = false;
2217 }
2218
2219 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2220
2221 #if INCLUDE_ALL_GCS
2222 if (UseG1GC) {
2223 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2224 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2225 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2226
2227 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2228 "InitiatingHeapOccupancyPercent");
2229 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2230 "G1RefProcDrainInterval");
2231 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2232 "G1ConcMarkStepDurationMillis");
2233 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2234 "G1ConcRSHotCardLimit");
2235 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2236 "G1ConcRSLogCacheSize");
2237 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2238 "StringDeduplicationAgeThreshold");
2239 }
2240 if (UseConcMarkSweepGC) {
2241 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2242 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2243 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2244 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2245
2246 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2247
2248 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2249 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2250 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2251
2252 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2253
2254 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2255 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2256
2257 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2258 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2259 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2260
2261 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2262
2263 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2264
2265 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2266 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2267 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2268 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2269 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2270 }
2271
2272 if (UseParallelGC || UseParallelOldGC) {
2273 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2274 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2275
2276 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2277 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2278
2279 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2280 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2281
2282 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2283
2284 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2285 }
2286 #endif // INCLUDE_ALL_GCS
2287
2288 status = status && verify_interval(RefDiscoveryPolicy,
2289 ReferenceProcessor::DiscoveryPolicyMin,
2290 ReferenceProcessor::DiscoveryPolicyMax,
2291 "RefDiscoveryPolicy");
2292
2293 // Limit the lower bound of this flag to 1 as it is used in a division
2294 // expression.
2295 status = status && verify_interval(TLABWasteTargetPercent,
2296 1, 100, "TLABWasteTargetPercent");
2297
2298 status = status && verify_object_alignment();
2299
2300 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2301 "CompressedClassSpaceSize");
2302
2303 status = status && verify_interval(MarkStackSizeMax,
2304 1, (max_jint - 1), "MarkStackSizeMax");
2305 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2306
2307 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2308
2309 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2310
2311 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2312
2313 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2314 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2315
2316 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2317
2318 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2319 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2320 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2321 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2322
2323 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2324 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2325
2326 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2327 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2328 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2329
2330 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2331 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2332
2333 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2334 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2335 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2336 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2337
2338 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2339
2340 if (PrintNMTStatistics) {
2341 #if INCLUDE_NMT
2342 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2343 #endif // INCLUDE_NMT
2344 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2345 PrintNMTStatistics = false;
2346 #if INCLUDE_NMT
2347 }
2348 #endif
2349 }
2350
2351 // Need to limit the extent of the padding to reasonable size.
2352 // 8K is well beyond the reasonable HW cache line size, even with the
2353 // aggressive prefetching, while still leaving the room for segregating
2354 // among the distinct pages.
2355 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2356 jio_fprintf(defaultStream::error_stream(),
2357 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2358 ContendedPaddingWidth, 0, 8192);
2359 status = false;
2360 }
2361
2362 // Need to enforce the padding not to break the existing field alignments.
2363 // It is sufficient to check against the largest type size.
2364 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2365 jio_fprintf(defaultStream::error_stream(),
2366 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2367 ContendedPaddingWidth, BytesPerLong);
2368 status = false;
2369 }
2370
2371 // Check lower bounds of the code cache
2372 // Template Interpreter code is approximately 3X larger in debug builds.
2373 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2374 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2375 jio_fprintf(defaultStream::error_stream(),
2376 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2377 os::vm_page_size()/K);
2378 status = false;
2379 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2380 jio_fprintf(defaultStream::error_stream(),
2381 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2382 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2383 status = false;
2384 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2385 jio_fprintf(defaultStream::error_stream(),
2386 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2387 min_code_cache_size/K);
2388 status = false;
2389 } else if (ReservedCodeCacheSize > 2*G) {
2390 // Code cache size larger than MAXINT is not supported.
2391 jio_fprintf(defaultStream::error_stream(),
2392 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2393 (2*G)/M);
2394 status = false;
2395 }
2396
2397 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2398 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2399 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2400 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2401
2402 // TieredCompilation needs at least 2 compiler threads.
2403 const int num_min_compiler_threads = (TieredCompilation && (TieredStopAtLevel >= CompLevel_full_optimization)) ? 2 : CI_COMPILER_COUNT;
2404 status &=verify_min_value(CICompilerCount, num_min_compiler_threads, "CICompilerCount");
2405
2406 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2407 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2408 }
2409
2410 return status;
2411 }
2412
2413 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2414 const char* option_type) {
2415 if (ignore) return false;
2416
2417 const char* spacer = " ";
2418 if (option_type == NULL) {
2419 option_type = ++spacer; // Set both to the empty string.
2420 }
2421
2422 if (os::obsolete_option(option)) {
2423 jio_fprintf(defaultStream::error_stream(),
2424 "Obsolete %s%soption: %s\n", option_type, spacer,
2425 option->optionString);
2426 return false;
2427 } else {
2428 jio_fprintf(defaultStream::error_stream(),
2429 "Unrecognized %s%soption: %s\n", option_type, spacer,
2430 option->optionString);
2431 return true;
2432 }
2433 }
2434
2435 static const char* user_assertion_options[] = {
2436 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2437 };
2438
2439 static const char* system_assertion_options[] = {
2440 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2441 };
2442
2443 // Return true if any of the strings in null-terminated array 'names' matches.
2444 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2445 // the option must match exactly.
2446 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2447 bool tail_allowed) {
2448 for (/* empty */; *names != NULL; ++names) {
2449 if (match_option(option, *names, tail)) {
2450 if (**tail == '\0' || tail_allowed && **tail == ':') {
2451 return true;
2452 }
2453 }
2454 }
2455 return false;
2456 }
2457
2458 bool Arguments::parse_uintx(const char* value,
2459 uintx* uintx_arg,
2460 uintx min_size) {
2461
2462 // Check the sign first since atomull() parses only unsigned values.
2463 bool value_is_positive = !(*value == '-');
2464
2465 if (value_is_positive) {
2466 julong n;
2467 bool good_return = atomull(value, &n);
2468 if (good_return) {
2469 bool above_minimum = n >= min_size;
2470 bool value_is_too_large = n > max_uintx;
2471
2472 if (above_minimum && !value_is_too_large) {
2473 *uintx_arg = n;
2474 return true;
2475 }
2476 }
2477 }
2478 return false;
2479 }
2480
2481 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2482 julong* long_arg,
2483 julong min_size) {
2484 if (!atomull(s, long_arg)) return arg_unreadable;
2485 return check_memory_size(*long_arg, min_size);
2486 }
2487
2488 // Parse JavaVMInitArgs structure
2489
2490 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2491 // For components of the system classpath.
2492 SysClassPath scp(Arguments::get_sysclasspath());
2493 bool scp_assembly_required = false;
2494
2495 // Save default settings for some mode flags
2496 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2497 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2498 Arguments::_ClipInlining = ClipInlining;
2499 Arguments::_BackgroundCompilation = BackgroundCompilation;
2500
2501 // Setup flags for mixed which is the default
2502 set_mode_flags(_mixed);
2503
2504 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2505 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2506 if (result != JNI_OK) {
2507 return result;
2508 }
2509
2510 // Parse JavaVMInitArgs structure passed in
2511 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2512 if (result != JNI_OK) {
2513 return result;
2514 }
2515
2516 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2517 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2518 if (result != JNI_OK) {
2519 return result;
2520 }
2521
2522 // Do final processing now that all arguments have been parsed
2523 result = finalize_vm_init_args(&scp, scp_assembly_required);
2524 if (result != JNI_OK) {
2525 return result;
2526 }
2527
2528 return JNI_OK;
2529 }
2530
2531 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2532 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2533 // are dealing with -agentpath (case where name is a path), otherwise with
2534 // -agentlib
2535 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2536 char *_name;
2537 const char *_hprof = "hprof", *_jdwp = "jdwp";
2538 size_t _len_hprof, _len_jdwp, _len_prefix;
2539
2540 if (is_path) {
2541 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2542 return false;
2543 }
2544
2545 _name++; // skip past last path separator
2546 _len_prefix = strlen(JNI_LIB_PREFIX);
2547
2548 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2549 return false;
2550 }
2551
2552 _name += _len_prefix;
2553 _len_hprof = strlen(_hprof);
2554 _len_jdwp = strlen(_jdwp);
2555
2556 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2557 _name += _len_hprof;
2558 }
2559 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2560 _name += _len_jdwp;
2561 }
2562 else {
2563 return false;
2564 }
2565
2566 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2567 return false;
2568 }
2569
2570 return true;
2571 }
2572
2573 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2574 return true;
2575 }
2576
2577 return false;
2578 }
2579
2580 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2581 SysClassPath* scp_p,
2582 bool* scp_assembly_required_p,
2583 Flag::Flags origin) {
2584 // Remaining part of option string
2585 const char* tail;
2586
2587 // iterate over arguments
2588 for (int index = 0; index < args->nOptions; index++) {
2589 bool is_absolute_path = false; // for -agentpath vs -agentlib
2590
2591 const JavaVMOption* option = args->options + index;
2592
2593 if (!match_option(option, "-Djava.class.path", &tail) &&
2594 !match_option(option, "-Dsun.java.command", &tail) &&
2595 !match_option(option, "-Dsun.java.launcher", &tail)) {
2596
2597 // add all jvm options to the jvm_args string. This string
2598 // is used later to set the java.vm.args PerfData string constant.
2599 // the -Djava.class.path and the -Dsun.java.command options are
2600 // omitted from jvm_args string as each have their own PerfData
2601 // string constant object.
2602 build_jvm_args(option->optionString);
2603 }
2604
2605 // -verbose:[class/gc/jni]
2606 if (match_option(option, "-verbose", &tail)) {
2607 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2608 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2609 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2610 } else if (!strcmp(tail, ":gc")) {
2611 FLAG_SET_CMDLINE(bool, PrintGC, true);
2612 } else if (!strcmp(tail, ":jni")) {
2613 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2614 }
2615 // -da / -ea / -disableassertions / -enableassertions
2616 // These accept an optional class/package name separated by a colon, e.g.,
2617 // -da:java.lang.Thread.
2618 } else if (match_option(option, user_assertion_options, &tail, true)) {
2619 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2620 if (*tail == '\0') {
2621 JavaAssertions::setUserClassDefault(enable);
2622 } else {
2623 assert(*tail == ':', "bogus match by match_option()");
2624 JavaAssertions::addOption(tail + 1, enable);
2625 }
2626 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2627 } else if (match_option(option, system_assertion_options, &tail, false)) {
2628 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2629 JavaAssertions::setSystemClassDefault(enable);
2630 // -bootclasspath:
2631 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2632 scp_p->reset_path(tail);
2633 *scp_assembly_required_p = true;
2634 // -bootclasspath/a:
2635 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2636 scp_p->add_suffix(tail);
2637 *scp_assembly_required_p = true;
2638 // -bootclasspath/p:
2639 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2640 scp_p->add_prefix(tail);
2641 *scp_assembly_required_p = true;
2642 // -Xrun
2643 } else if (match_option(option, "-Xrun", &tail)) {
2644 if (tail != NULL) {
2645 const char* pos = strchr(tail, ':');
2646 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2647 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2648 name[len] = '\0';
2649
2650 char *options = NULL;
2651 if(pos != NULL) {
2652 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2653 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2654 }
2655 #if !INCLUDE_JVMTI
2656 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2657 jio_fprintf(defaultStream::error_stream(),
2658 "Profiling and debugging agents are not supported in this VM\n");
2659 return JNI_ERR;
2660 }
2661 #endif // !INCLUDE_JVMTI
2662 add_init_library(name, options);
2663 }
2664 // -agentlib and -agentpath
2665 } else if (match_option(option, "-agentlib:", &tail) ||
2666 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2667 if(tail != NULL) {
2668 const char* pos = strchr(tail, '=');
2669 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2670 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2671 name[len] = '\0';
2672
2673 char *options = NULL;
2674 if(pos != NULL) {
2675 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2676 }
2677 #if !INCLUDE_JVMTI
2678 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2679 jio_fprintf(defaultStream::error_stream(),
2680 "Profiling and debugging agents are not supported in this VM\n");
2681 return JNI_ERR;
2682 }
2683 #endif // !INCLUDE_JVMTI
2684 add_init_agent(name, options, is_absolute_path);
2685 }
2686 // -javaagent
2687 } else if (match_option(option, "-javaagent:", &tail)) {
2688 #if !INCLUDE_JVMTI
2689 jio_fprintf(defaultStream::error_stream(),
2690 "Instrumentation agents are not supported in this VM\n");
2691 return JNI_ERR;
2692 #else
2693 if(tail != NULL) {
2694 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2695 add_init_agent("instrument", options, false);
2696 }
2697 #endif // !INCLUDE_JVMTI
2698 // -Xnoclassgc
2699 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2700 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2701 // -Xincgc: i-CMS
2702 } else if (match_option(option, "-Xincgc", &tail)) {
2703 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2704 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2705 // -Xnoincgc: no i-CMS
2706 } else if (match_option(option, "-Xnoincgc", &tail)) {
2707 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2708 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2709 // -Xconcgc
2710 } else if (match_option(option, "-Xconcgc", &tail)) {
2711 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2712 // -Xnoconcgc
2713 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2714 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2715 // -Xbatch
2716 } else if (match_option(option, "-Xbatch", &tail)) {
2717 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2718 // -Xmn for compatibility with other JVM vendors
2719 } else if (match_option(option, "-Xmn", &tail)) {
2720 julong long_initial_young_size = 0;
2721 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2722 if (errcode != arg_in_range) {
2723 jio_fprintf(defaultStream::error_stream(),
2724 "Invalid initial young generation size: %s\n", option->optionString);
2725 describe_range_error(errcode);
2726 return JNI_EINVAL;
2727 }
2728 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2729 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2730 // -Xms
2731 } else if (match_option(option, "-Xms", &tail)) {
2732 julong long_initial_heap_size = 0;
2733 // an initial heap size of 0 means automatically determine
2734 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2735 if (errcode != arg_in_range) {
2736 jio_fprintf(defaultStream::error_stream(),
2737 "Invalid initial heap size: %s\n", option->optionString);
2738 describe_range_error(errcode);
2739 return JNI_EINVAL;
2740 }
2741 set_min_heap_size((uintx)long_initial_heap_size);
2742 // Currently the minimum size and the initial heap sizes are the same.
2743 // Can be overridden with -XX:InitialHeapSize.
2744 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2745 // -Xmx
2746 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2747 julong long_max_heap_size = 0;
2748 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2749 if (errcode != arg_in_range) {
2750 jio_fprintf(defaultStream::error_stream(),
2751 "Invalid maximum heap size: %s\n", option->optionString);
2752 describe_range_error(errcode);
2753 return JNI_EINVAL;
2754 }
2755 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2756 // Xmaxf
2757 } else if (match_option(option, "-Xmaxf", &tail)) {
2758 char* err;
2759 int maxf = (int)(strtod(tail, &err) * 100);
2760 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2761 jio_fprintf(defaultStream::error_stream(),
2762 "Bad max heap free percentage size: %s\n",
2763 option->optionString);
2764 return JNI_EINVAL;
2765 } else {
2766 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2767 }
2768 // Xminf
2769 } else if (match_option(option, "-Xminf", &tail)) {
2770 char* err;
2771 int minf = (int)(strtod(tail, &err) * 100);
2772 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2773 jio_fprintf(defaultStream::error_stream(),
2774 "Bad min heap free percentage size: %s\n",
2775 option->optionString);
2776 return JNI_EINVAL;
2777 } else {
2778 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2779 }
2780 // -Xss
2781 } else if (match_option(option, "-Xss", &tail)) {
2782 julong long_ThreadStackSize = 0;
2783 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2784 if (errcode != arg_in_range) {
2785 jio_fprintf(defaultStream::error_stream(),
2786 "Invalid thread stack size: %s\n", option->optionString);
2787 describe_range_error(errcode);
2788 return JNI_EINVAL;
2789 }
2790 // Internally track ThreadStackSize in units of 1024 bytes.
2791 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2792 round_to((int)long_ThreadStackSize, K) / K);
2793 // -Xoss
2794 } else if (match_option(option, "-Xoss", &tail)) {
2795 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2796 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2797 julong long_CodeCacheExpansionSize = 0;
2798 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2799 if (errcode != arg_in_range) {
2800 jio_fprintf(defaultStream::error_stream(),
2801 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2802 os::vm_page_size()/K);
2803 return JNI_EINVAL;
2804 }
2805 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2806 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2807 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2808 julong long_ReservedCodeCacheSize = 0;
2809
2810 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2811 if (errcode != arg_in_range) {
2812 jio_fprintf(defaultStream::error_stream(),
2813 "Invalid maximum code cache size: %s.\n", option->optionString);
2814 return JNI_EINVAL;
2815 }
2816 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2817 //-XX:IncreaseFirstTierCompileThresholdAt=
2818 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2819 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2820 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2821 jio_fprintf(defaultStream::error_stream(),
2822 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2823 option->optionString);
2824 return JNI_EINVAL;
2825 }
2826 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2827 // -green
2828 } else if (match_option(option, "-green", &tail)) {
2829 jio_fprintf(defaultStream::error_stream(),
2830 "Green threads support not available\n");
2831 return JNI_EINVAL;
2832 // -native
2833 } else if (match_option(option, "-native", &tail)) {
2834 // HotSpot always uses native threads, ignore silently for compatibility
2835 // -Xsqnopause
2836 } else if (match_option(option, "-Xsqnopause", &tail)) {
2837 // EVM option, ignore silently for compatibility
2838 // -Xrs
2839 } else if (match_option(option, "-Xrs", &tail)) {
2840 // Classic/EVM option, new functionality
2841 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2842 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2843 // change default internal VM signals used - lower case for back compat
2844 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2845 // -Xoptimize
2846 } else if (match_option(option, "-Xoptimize", &tail)) {
2847 // EVM option, ignore silently for compatibility
2848 // -Xprof
2849 } else if (match_option(option, "-Xprof", &tail)) {
2850 #if INCLUDE_FPROF
2851 _has_profile = true;
2852 #else // INCLUDE_FPROF
2853 jio_fprintf(defaultStream::error_stream(),
2854 "Flat profiling is not supported in this VM.\n");
2855 return JNI_ERR;
2856 #endif // INCLUDE_FPROF
2857 // -Xconcurrentio
2858 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2859 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2860 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2861 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2862 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2863 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2864
2865 // -Xinternalversion
2866 } else if (match_option(option, "-Xinternalversion", &tail)) {
2867 jio_fprintf(defaultStream::output_stream(), "%s\n",
2868 VM_Version::internal_vm_info_string());
2869 vm_exit(0);
2870 #ifndef PRODUCT
2871 // -Xprintflags
2872 } else if (match_option(option, "-Xprintflags", &tail)) {
2873 CommandLineFlags::printFlags(tty, false);
2874 vm_exit(0);
2875 #endif
2876 // -D
2877 } else if (match_option(option, "-D", &tail)) {
2878 if (!add_property(tail)) {
2879 return JNI_ENOMEM;
2880 }
2881 // Out of the box management support
2882 if (match_option(option, "-Dcom.sun.management", &tail)) {
2883 #if INCLUDE_MANAGEMENT
2884 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2885 #else
2886 jio_fprintf(defaultStream::output_stream(),
2887 "-Dcom.sun.management is not supported in this VM.\n");
2888 return JNI_ERR;
2889 #endif
2890 }
2891 // -Xint
2892 } else if (match_option(option, "-Xint", &tail)) {
2893 set_mode_flags(_int);
2894 // -Xmixed
2895 } else if (match_option(option, "-Xmixed", &tail)) {
2896 set_mode_flags(_mixed);
2897 // -Xcomp
2898 } else if (match_option(option, "-Xcomp", &tail)) {
2899 // for testing the compiler; turn off all flags that inhibit compilation
2900 set_mode_flags(_comp);
2901 // -Xshare:dump
2902 } else if (match_option(option, "-Xshare:dump", &tail)) {
2903 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2904 set_mode_flags(_int); // Prevent compilation, which creates objects
2905 // -Xshare:on
2906 } else if (match_option(option, "-Xshare:on", &tail)) {
2907 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2908 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2909 // -Xshare:auto
2910 } else if (match_option(option, "-Xshare:auto", &tail)) {
2911 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2912 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2913 // -Xshare:off
2914 } else if (match_option(option, "-Xshare:off", &tail)) {
2915 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2916 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2917 // -Xverify
2918 } else if (match_option(option, "-Xverify", &tail)) {
2919 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2920 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2921 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2922 } else if (strcmp(tail, ":remote") == 0) {
2923 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2924 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2925 } else if (strcmp(tail, ":none") == 0) {
2926 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2927 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2928 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2929 return JNI_EINVAL;
2930 }
2931 // -Xdebug
2932 } else if (match_option(option, "-Xdebug", &tail)) {
2933 // note this flag has been used, then ignore
2934 set_xdebug_mode(true);
2935 // -Xnoagent
2936 } else if (match_option(option, "-Xnoagent", &tail)) {
2937 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2938 } else if (match_option(option, "-Xboundthreads", &tail)) {
2939 // Bind user level threads to kernel threads (Solaris only)
2940 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2941 } else if (match_option(option, "-Xloggc:", &tail)) {
2942 // Redirect GC output to the file. -Xloggc:<filename>
2943 // ostream_init_log(), when called will use this filename
2944 // to initialize a fileStream.
2945 _gc_log_filename = strdup(tail);
2946 if (!is_filename_valid(_gc_log_filename)) {
2947 jio_fprintf(defaultStream::output_stream(),
2948 "Invalid file name for use with -Xloggc: Filename can only contain the "
2949 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2950 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2951 return JNI_EINVAL;
2952 }
2953 FLAG_SET_CMDLINE(bool, PrintGC, true);
2954 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2955
2956 // JNI hooks
2957 } else if (match_option(option, "-Xcheck", &tail)) {
2958 if (!strcmp(tail, ":jni")) {
2959 #if !INCLUDE_JNI_CHECK
2960 warning("JNI CHECKING is not supported in this VM");
2961 #else
2962 CheckJNICalls = true;
2963 #endif // INCLUDE_JNI_CHECK
2964 } else if (is_bad_option(option, args->ignoreUnrecognized,
2965 "check")) {
2966 return JNI_EINVAL;
2967 }
2968 } else if (match_option(option, "vfprintf", &tail)) {
2969 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2970 } else if (match_option(option, "exit", &tail)) {
2971 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2972 } else if (match_option(option, "abort", &tail)) {
2973 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2974 // -XX:+AggressiveHeap
2975 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2976
2977 // This option inspects the machine and attempts to set various
2978 // parameters to be optimal for long-running, memory allocation
2979 // intensive jobs. It is intended for machines with large
2980 // amounts of cpu and memory.
2981
2982 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2983 // VM, but we may not be able to represent the total physical memory
2984 // available (like having 8gb of memory on a box but using a 32bit VM).
2985 // Thus, we need to make sure we're using a julong for intermediate
2986 // calculations.
2987 julong initHeapSize;
2988 julong total_memory = os::physical_memory();
2989
2990 if (total_memory < (julong)256*M) {
2991 jio_fprintf(defaultStream::error_stream(),
2992 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2993 vm_exit(1);
2994 }
2995
2996 // The heap size is half of available memory, or (at most)
2997 // all of possible memory less 160mb (leaving room for the OS
2998 // when using ISM). This is the maximum; because adaptive sizing
2999 // is turned on below, the actual space used may be smaller.
3000
3001 initHeapSize = MIN2(total_memory / (julong)2,
3002 total_memory - (julong)160*M);
3003
3004 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3005
3006 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3007 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3008 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3009 // Currently the minimum size and the initial heap sizes are the same.
3010 set_min_heap_size(initHeapSize);
3011 }
3012 if (FLAG_IS_DEFAULT(NewSize)) {
3013 // Make the young generation 3/8ths of the total heap.
3014 FLAG_SET_CMDLINE(uintx, NewSize,
3015 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3016 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3017 }
3018
3019 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3020 FLAG_SET_DEFAULT(UseLargePages, true);
3021 #endif
3022
3023 // Increase some data structure sizes for efficiency
3024 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3025 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3026 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3027
3028 // See the OldPLABSize comment below, but replace 'after promotion'
3029 // with 'after copying'. YoungPLABSize is the size of the survivor
3030 // space per-gc-thread buffers. The default is 4kw.
3031 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3032
3033 // OldPLABSize is the size of the buffers in the old gen that
3034 // UseParallelGC uses to promote live data that doesn't fit in the
3035 // survivor spaces. At any given time, there's one for each gc thread.
3036 // The default size is 1kw. These buffers are rarely used, since the
3037 // survivor spaces are usually big enough. For specjbb, however, there
3038 // are occasions when there's lots of live data in the young gen
3039 // and we end up promoting some of it. We don't have a definite
3040 // explanation for why bumping OldPLABSize helps, but the theory
3041 // is that a bigger PLAB results in retaining something like the
3042 // original allocation order after promotion, which improves mutator
3043 // locality. A minor effect may be that larger PLABs reduce the
3044 // number of PLAB allocation events during gc. The value of 8kw
3045 // was arrived at by experimenting with specjbb.
3046 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3047
3048 // Enable parallel GC and adaptive generation sizing
3049 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3050 FLAG_SET_DEFAULT(ParallelGCThreads,
3051 Abstract_VM_Version::parallel_worker_threads());
3052
3053 // Encourage steady state memory management
3054 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3055
3056 // This appears to improve mutator locality
3057 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3058
3059 // Get around early Solaris scheduling bug
3060 // (affinity vs other jobs on system)
3061 // but disallow DR and offlining (5008695).
3062 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3063
3064 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3065 // and the last option wins.
3066 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3067 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3068 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3069 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3070 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3071 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3072 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3073 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3074 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3075 uintx max_tenuring_thresh = 0;
3076 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3077 jio_fprintf(defaultStream::error_stream(),
3078 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3079 }
3080 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3081
3082 if (MaxTenuringThreshold == 0) {
3083 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3084 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3085 } else {
3086 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3087 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3088 }
3089 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3090 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3091 jio_fprintf(defaultStream::error_stream(),
3092 "Please use CMSClassUnloadingEnabled in place of "
3093 "CMSPermGenSweepingEnabled in the future\n");
3094 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3095 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3096 jio_fprintf(defaultStream::error_stream(),
3097 "Please use -XX:+UseGCOverheadLimit in place of "
3098 "-XX:+UseGCTimeLimit in the future\n");
3099 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3100 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3101 jio_fprintf(defaultStream::error_stream(),
3102 "Please use -XX:-UseGCOverheadLimit in place of "
3103 "-XX:-UseGCTimeLimit in the future\n");
3104 // The TLE options are for compatibility with 1.3 and will be
3105 // removed without notice in a future release. These options
3106 // are not to be documented.
3107 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3108 // No longer used.
3109 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3110 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3111 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3112 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3113 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3114 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3115 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3116 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3117 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3118 // No longer used.
3119 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3120 julong long_tlab_size = 0;
3121 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3122 if (errcode != arg_in_range) {
3123 jio_fprintf(defaultStream::error_stream(),
3124 "Invalid TLAB size: %s\n", option->optionString);
3125 describe_range_error(errcode);
3126 return JNI_EINVAL;
3127 }
3128 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3129 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3130 // No longer used.
3131 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3132 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3133 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3134 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3135 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3136 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3137 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3138 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3139 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3140 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3141 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3142 #if defined(DTRACE_ENABLED)
3143 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3144 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3145 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3146 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3147 #else // defined(DTRACE_ENABLED)
3148 jio_fprintf(defaultStream::error_stream(),
3149 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3150 return JNI_EINVAL;
3151 #endif // defined(DTRACE_ENABLED)
3152 #ifdef ASSERT
3153 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3154 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3155 // disable scavenge before parallel mark-compact
3156 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3157 #endif
3158 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3159 julong cms_blocks_to_claim = (julong)atol(tail);
3160 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3161 jio_fprintf(defaultStream::error_stream(),
3162 "Please use -XX:OldPLABSize in place of "
3163 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3164 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3165 julong cms_blocks_to_claim = (julong)atol(tail);
3166 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3167 jio_fprintf(defaultStream::error_stream(),
3168 "Please use -XX:OldPLABSize in place of "
3169 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3170 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3171 julong old_plab_size = 0;
3172 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3173 if (errcode != arg_in_range) {
3174 jio_fprintf(defaultStream::error_stream(),
3175 "Invalid old PLAB size: %s\n", option->optionString);
3176 describe_range_error(errcode);
3177 return JNI_EINVAL;
3178 }
3179 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3180 jio_fprintf(defaultStream::error_stream(),
3181 "Please use -XX:OldPLABSize in place of "
3182 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3183 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3184 julong young_plab_size = 0;
3185 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3186 if (errcode != arg_in_range) {
3187 jio_fprintf(defaultStream::error_stream(),
3188 "Invalid young PLAB size: %s\n", option->optionString);
3189 describe_range_error(errcode);
3190 return JNI_EINVAL;
3191 }
3192 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3193 jio_fprintf(defaultStream::error_stream(),
3194 "Please use -XX:YoungPLABSize in place of "
3195 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3196 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3197 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3198 julong stack_size = 0;
3199 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3200 if (errcode != arg_in_range) {
3201 jio_fprintf(defaultStream::error_stream(),
3202 "Invalid mark stack size: %s\n", option->optionString);
3203 describe_range_error(errcode);
3204 return JNI_EINVAL;
3205 }
3206 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3207 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3208 julong max_stack_size = 0;
3209 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3210 if (errcode != arg_in_range) {
3211 jio_fprintf(defaultStream::error_stream(),
3212 "Invalid maximum mark stack size: %s\n",
3213 option->optionString);
3214 describe_range_error(errcode);
3215 return JNI_EINVAL;
3216 }
3217 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3218 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3219 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3220 uintx conc_threads = 0;
3221 if (!parse_uintx(tail, &conc_threads, 1)) {
3222 jio_fprintf(defaultStream::error_stream(),
3223 "Invalid concurrent threads: %s\n", option->optionString);
3224 return JNI_EINVAL;
3225 }
3226 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3227 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3228 julong max_direct_memory_size = 0;
3229 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3230 if (errcode != arg_in_range) {
3231 jio_fprintf(defaultStream::error_stream(),
3232 "Invalid maximum direct memory size: %s\n",
3233 option->optionString);
3234 describe_range_error(errcode);
3235 return JNI_EINVAL;
3236 }
3237 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3238 #if !INCLUDE_MANAGEMENT
3239 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3240 jio_fprintf(defaultStream::error_stream(),
3241 "ManagementServer is not supported in this VM.\n");
3242 return JNI_ERR;
3243 #endif // INCLUDE_MANAGEMENT
3244 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3245 // Skip -XX:Flags= since that case has already been handled
3246 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3247 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3248 return JNI_EINVAL;
3249 }
3250 }
3251 // Unknown option
3252 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3253 return JNI_ERR;
3254 }
3255 }
3256
3257 // Change the default value for flags which have different default values
3258 // when working with older JDKs.
3259 #ifdef LINUX
3260 if (JDK_Version::current().compare_major(6) <= 0 &&
3261 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3262 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3263 }
3264 #endif // LINUX
3265 return JNI_OK;
3266 }
3267
3268 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3269 // This must be done after all -D arguments have been processed.
3270 scp_p->expand_endorsed();
3271
3272 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3273 // Assemble the bootclasspath elements into the final path.
3274 Arguments::set_sysclasspath(scp_p->combined_path());
3275 }
3276
3277 // This must be done after all arguments have been processed.
3278 // java_compiler() true means set to "NONE" or empty.
3279 if (java_compiler() && !xdebug_mode()) {
3280 // For backwards compatibility, we switch to interpreted mode if
3281 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3282 // not specified.
3283 set_mode_flags(_int);
3284 }
3285 if (CompileThreshold == 0) {
3286 set_mode_flags(_int);
3287 }
3288
3289 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3290 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3291 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3292 }
3293
3294 #ifndef COMPILER2
3295 // Don't degrade server performance for footprint
3296 if (FLAG_IS_DEFAULT(UseLargePages) &&
3297 MaxHeapSize < LargePageHeapSizeThreshold) {
3298 // No need for large granularity pages w/small heaps.
3299 // Note that large pages are enabled/disabled for both the
3300 // Java heap and the code cache.
3301 FLAG_SET_DEFAULT(UseLargePages, false);
3302 }
3303
3304 #else
3305 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3306 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3307 }
3308 #endif
3309
3310 #ifndef TIERED
3311 // Tiered compilation is undefined.
3312 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3313 #endif
3314
3315 // If we are running in a headless jre, force java.awt.headless property
3316 // to be true unless the property has already been set.
3317 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3318 if (os::is_headless_jre()) {
3319 const char* headless = Arguments::get_property("java.awt.headless");
3320 if (headless == NULL) {
3321 char envbuffer[128];
3322 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3323 if (!add_property("java.awt.headless=true")) {
3324 return JNI_ENOMEM;
3325 }
3326 } else {
3327 char buffer[256];
3328 strcpy(buffer, "java.awt.headless=");
3329 strcat(buffer, envbuffer);
3330 if (!add_property(buffer)) {
3331 return JNI_ENOMEM;
3332 }
3333 }
3334 }
3335 }
3336
3337 if (!check_vm_args_consistency()) {
3338 return JNI_ERR;
3339 }
3340
3341 return JNI_OK;
3342 }
3343
3344 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3345 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3346 scp_assembly_required_p);
3347 }
3348
3349 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3350 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3351 scp_assembly_required_p);
3352 }
3353
3354 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3355 const int N_MAX_OPTIONS = 64;
3356 const int OPTION_BUFFER_SIZE = 1024;
3357 char buffer[OPTION_BUFFER_SIZE];
3358
3359 // The variable will be ignored if it exceeds the length of the buffer.
3360 // Don't check this variable if user has special privileges
3361 // (e.g. unix su command).
3362 if (os::getenv(name, buffer, sizeof(buffer)) &&
3363 !os::have_special_privileges()) {
3364 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3365 jio_fprintf(defaultStream::error_stream(),
3366 "Picked up %s: %s\n", name, buffer);
3367 char* rd = buffer; // pointer to the input string (rd)
3368 int i;
3369 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3370 while (isspace(*rd)) rd++; // skip whitespace
3371 if (*rd == 0) break; // we re done when the input string is read completely
3372
3373 // The output, option string, overwrites the input string.
3374 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3375 // input string (rd).
3376 char* wrt = rd;
3377
3378 options[i++].optionString = wrt; // Fill in option
3379 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3380 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3381 int quote = *rd; // matching quote to look for
3382 rd++; // don't copy open quote
3383 while (*rd != quote) { // include everything (even spaces) up until quote
3384 if (*rd == 0) { // string termination means unmatched string
3385 jio_fprintf(defaultStream::error_stream(),
3386 "Unmatched quote in %s\n", name);
3387 return JNI_ERR;
3388 }
3389 *wrt++ = *rd++; // copy to option string
3390 }
3391 rd++; // don't copy close quote
3392 } else {
3393 *wrt++ = *rd++; // copy to option string
3394 }
3395 }
3396 // Need to check if we're done before writing a NULL,
3397 // because the write could be to the byte that rd is pointing to.
3398 if (*rd++ == 0) {
3399 *wrt = 0;
3400 break;
3401 }
3402 *wrt = 0; // Zero terminate option
3403 }
3404 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3405 JavaVMInitArgs vm_args;
3406 vm_args.version = JNI_VERSION_1_2;
3407 vm_args.options = options;
3408 vm_args.nOptions = i;
3409 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3410
3411 if (PrintVMOptions) {
3412 const char* tail;
3413 for (int i = 0; i < vm_args.nOptions; i++) {
3414 const JavaVMOption *option = vm_args.options + i;
3415 if (match_option(option, "-XX:", &tail)) {
3416 logOption(tail);
3417 }
3418 }
3419 }
3420
3421 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3422 }
3423 return JNI_OK;
3424 }
3425
3426 void Arguments::set_shared_spaces_flags() {
3427 if (DumpSharedSpaces) {
3428 if (RequireSharedSpaces) {
3429 warning("cannot dump shared archive while using shared archive");
3430 }
3431 UseSharedSpaces = false;
3432 #ifdef _LP64
3433 if (!UseCompressedOops || !UseCompressedClassPointers) {
3434 vm_exit_during_initialization(
3435 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3436 }
3437 } else {
3438 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3439 if (!UseCompressedOops || !UseCompressedClassPointers) {
3440 no_shared_spaces();
3441 }
3442 #endif
3443 }
3444 }
3445
3446 #if !INCLUDE_ALL_GCS
3447 static void force_serial_gc() {
3448 FLAG_SET_DEFAULT(UseSerialGC, true);
3449 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3450 UNSUPPORTED_GC_OPTION(UseG1GC);
3451 UNSUPPORTED_GC_OPTION(UseParallelGC);
3452 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3453 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3454 UNSUPPORTED_GC_OPTION(UseParNewGC);
3455 }
3456 #endif // INCLUDE_ALL_GCS
3457
3458 // Sharing support
3459 // Construct the path to the archive
3460 static char* get_shared_archive_path() {
3461 char *shared_archive_path;
3462 if (SharedArchiveFile == NULL) {
3463 char jvm_path[JVM_MAXPATHLEN];
3464 os::jvm_path(jvm_path, sizeof(jvm_path));
3465 char *end = strrchr(jvm_path, *os::file_separator());
3466 if (end != NULL) *end = '\0';
3467 size_t jvm_path_len = strlen(jvm_path);
3468 size_t file_sep_len = strlen(os::file_separator());
3469 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3470 file_sep_len + 20, mtInternal);
3471 if (shared_archive_path != NULL) {
3472 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3473 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3474 strncat(shared_archive_path, "classes.jsa", 11);
3475 }
3476 } else {
3477 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3478 if (shared_archive_path != NULL) {
3479 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3480 }
3481 }
3482 return shared_archive_path;
3483 }
3484
3485 #ifndef PRODUCT
3486 // Determine whether LogVMOutput should be implicitly turned on.
3487 static bool use_vm_log() {
3488 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3489 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3490 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3491 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3492 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3493 return true;
3494 }
3495
3496 #ifdef COMPILER1
3497 if (PrintC1Statistics) {
3498 return true;
3499 }
3500 #endif // COMPILER1
3501
3502 #ifdef COMPILER2
3503 if (PrintOptoAssembly || PrintOptoStatistics) {
3504 return true;
3505 }
3506 #endif // COMPILER2
3507
3508 return false;
3509 }
3510 #endif // PRODUCT
3511
3512 // Parse entry point called from JNI_CreateJavaVM
3513
3514 jint Arguments::parse(const JavaVMInitArgs* args) {
3515
3516 // Remaining part of option string
3517 const char* tail;
3518
3519 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3520 const char* hotspotrc = ".hotspotrc";
3521 bool settings_file_specified = false;
3522 bool needs_hotspotrc_warning = false;
3523
3524 const char* flags_file;
3525 int index;
3526 for (index = 0; index < args->nOptions; index++) {
3527 const JavaVMOption *option = args->options + index;
3528 if (match_option(option, "-XX:Flags=", &tail)) {
3529 flags_file = tail;
3530 settings_file_specified = true;
3531 }
3532 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3533 PrintVMOptions = true;
3534 }
3535 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3536 PrintVMOptions = false;
3537 }
3538 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3539 IgnoreUnrecognizedVMOptions = true;
3540 }
3541 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3542 IgnoreUnrecognizedVMOptions = false;
3543 }
3544 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3545 CommandLineFlags::printFlags(tty, false);
3546 vm_exit(0);
3547 }
3548 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3549 #if INCLUDE_NMT
3550 MemTracker::init_tracking_options(tail);
3551 #else
3552 jio_fprintf(defaultStream::error_stream(),
3553 "Native Memory Tracking is not supported in this VM\n");
3554 return JNI_ERR;
3555 #endif
3556 }
3557
3558
3559 #ifndef PRODUCT
3560 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3561 CommandLineFlags::printFlags(tty, true);
3562 vm_exit(0);
3563 }
3564 #endif
3565 }
3566
3567 if (IgnoreUnrecognizedVMOptions) {
3568 // uncast const to modify the flag args->ignoreUnrecognized
3569 *(jboolean*)(&args->ignoreUnrecognized) = true;
3570 }
3571
3572 // Parse specified settings file
3573 if (settings_file_specified) {
3574 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3575 return JNI_EINVAL;
3576 }
3577 } else {
3578 #ifdef ASSERT
3579 // Parse default .hotspotrc settings file
3580 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3581 return JNI_EINVAL;
3582 }
3583 #else
3584 struct stat buf;
3585 if (os::stat(hotspotrc, &buf) == 0) {
3586 needs_hotspotrc_warning = true;
3587 }
3588 #endif
3589 }
3590
3591 if (PrintVMOptions) {
3592 for (index = 0; index < args->nOptions; index++) {
3593 const JavaVMOption *option = args->options + index;
3594 if (match_option(option, "-XX:", &tail)) {
3595 logOption(tail);
3596 }
3597 }
3598 }
3599
3600 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3601 jint result = parse_vm_init_args(args);
3602 if (result != JNI_OK) {
3603 return result;
3604 }
3605
3606 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3607 SharedArchivePath = get_shared_archive_path();
3608 if (SharedArchivePath == NULL) {
3609 return JNI_ENOMEM;
3610 }
3611
3612 // Delay warning until here so that we've had a chance to process
3613 // the -XX:-PrintWarnings flag
3614 if (needs_hotspotrc_warning) {
3615 warning("%s file is present but has been ignored. "
3616 "Run with -XX:Flags=%s to load the file.",
3617 hotspotrc, hotspotrc);
3618 }
3619
3620 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3621 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3622 #endif
3623
3624 #if INCLUDE_ALL_GCS
3625 #if (defined JAVASE_EMBEDDED || defined ARM)
3626 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3627 #endif
3628 #endif
3629
3630 #ifndef PRODUCT
3631 if (TraceBytecodesAt != 0) {
3632 TraceBytecodes = true;
3633 }
3634 if (CountCompiledCalls) {
3635 if (UseCounterDecay) {
3636 warning("UseCounterDecay disabled because CountCalls is set");
3637 UseCounterDecay = false;
3638 }
3639 }
3640 #endif // PRODUCT
3641
3642 if (ScavengeRootsInCode == 0) {
3643 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3644 warning("forcing ScavengeRootsInCode non-zero");
3645 }
3646 ScavengeRootsInCode = 1;
3647 }
3648
3649 if (PrintGCDetails) {
3650 // Turn on -verbose:gc options as well
3651 PrintGC = true;
3652 }
3653
3654 if (!JDK_Version::is_gte_jdk18x_version()) {
3655 // To avoid changing the log format for 7 updates this flag is only
3656 // true by default in JDK8 and above.
3657 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3658 FLAG_SET_DEFAULT(PrintGCCause, false);
3659 }
3660 }
3661
3662 // Set object alignment values.
3663 set_object_alignment();
3664
3665 #if !INCLUDE_ALL_GCS
3666 force_serial_gc();
3667 #endif // INCLUDE_ALL_GCS
3668 #if !INCLUDE_CDS
3669 if (DumpSharedSpaces || RequireSharedSpaces) {
3670 jio_fprintf(defaultStream::error_stream(),
3671 "Shared spaces are not supported in this VM\n");
3672 return JNI_ERR;
3673 }
3674 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3675 warning("Shared spaces are not supported in this VM");
3676 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3677 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3678 }
3679 no_shared_spaces();
3680 #endif // INCLUDE_CDS
3681
3682 return JNI_OK;
3683 }
3684
3685 jint Arguments::apply_ergo() {
3686
3687 // Set flags based on ergonomics.
3688 set_ergonomics_flags();
3689
3690 set_shared_spaces_flags();
3691
3692 // Check the GC selections again.
3693 if (!check_gc_consistency()) {
3694 return JNI_EINVAL;
3695 }
3696
3697 if (TieredCompilation) {
3698 set_tiered_flags();
3699 } else {
3700 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3701 if (CompilationPolicyChoice >= 2) {
3702 vm_exit_during_initialization(
3703 "Incompatible compilation policy selected", NULL);
3704 }
3705 }
3706 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3707 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3708 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3709 }
3710
3711
3712 // Set heap size based on available physical memory
3713 set_heap_size();
3714
3715 #if INCLUDE_ALL_GCS
3716 // Set per-collector flags
3717 if (UseParallelGC || UseParallelOldGC) {
3718 set_parallel_gc_flags();
3719 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
3720 set_cms_and_parnew_gc_flags();
3721 } else if (UseParNewGC) { // Skipped if CMS is set above
3722 set_parnew_gc_flags();
3723 } else if (UseG1GC) {
3724 set_g1_gc_flags();
3725 }
3726 check_deprecated_gcs();
3727 check_deprecated_gc_flags();
3728 if (AssumeMP && !UseSerialGC) {
3729 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3730 warning("If the number of processors is expected to increase from one, then"
3731 " you should configure the number of parallel GC threads appropriately"
3732 " using -XX:ParallelGCThreads=N");
3733 }
3734 }
3735 if (MinHeapFreeRatio == 100) {
3736 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
3737 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
3738 }
3739 #else // INCLUDE_ALL_GCS
3740 assert(verify_serial_gc_flags(), "SerialGC unset");
3741 #endif // INCLUDE_ALL_GCS
3742
3743 // Initialize Metaspace flags and alignments
3744 Metaspace::ergo_initialize();
3745
3746 // Set bytecode rewriting flags
3747 set_bytecode_flags();
3748
3749 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3750 set_aggressive_opts_flags();
3751
3752 // Turn off biased locking for locking debug mode flags,
3753 // which are subtly different from each other but neither works with
3754 // biased locking
3755 if (UseHeavyMonitors
3756 #ifdef COMPILER1
3757 || !UseFastLocking
3758 #endif // COMPILER1
3759 ) {
3760 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3761 // flag set to true on command line; warn the user that they
3762 // can't enable biased locking here
3763 warning("Biased Locking is not supported with locking debug flags"
3764 "; ignoring UseBiasedLocking flag." );
3765 }
3766 UseBiasedLocking = false;
3767 }
3768
3769 #ifdef ZERO
3770 // Clear flags not supported on zero.
3771 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3772 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3773 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3774 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3775 #endif // CC_INTERP
3776
3777 #ifdef COMPILER2
3778 if (!EliminateLocks) {
3779 EliminateNestedLocks = false;
3780 }
3781 if (!Inline) {
3782 IncrementalInline = false;
3783 }
3784 #ifndef PRODUCT
3785 if (!IncrementalInline) {
3786 AlwaysIncrementalInline = false;
3787 }
3788 #endif
3789 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3790 // nothing to use the profiling, turn if off
3791 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3792 }
3793 if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) {
3794 // Doing the replace in parent maps helps speculation
3795 FLAG_SET_DEFAULT(ReplaceInParentMaps, true);
3796 }
3797 #endif
3798
3799 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3800 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3801 DebugNonSafepoints = true;
3802 }
3803
3804 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3805 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3806 }
3807
3808 #ifndef PRODUCT
3809 if (CompileTheWorld) {
3810 // Force NmethodSweeper to sweep whole CodeCache each time.
3811 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3812 NmethodSweepFraction = 1;
3813 }
3814 }
3815
3816 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3817 if (use_vm_log()) {
3818 LogVMOutput = true;
3819 }
3820 }
3821 #endif // PRODUCT
3822
3823 if (PrintCommandLineFlags) {
3824 CommandLineFlags::printSetFlags(tty);
3825 }
3826
3827 // Apply CPU specific policy for the BiasedLocking
3828 if (UseBiasedLocking) {
3829 if (!VM_Version::use_biased_locking() &&
3830 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3831 UseBiasedLocking = false;
3832 }
3833 }
3834 #ifdef COMPILER2
3835 if (!UseBiasedLocking || EmitSync != 0) {
3836 UseOptoBiasInlining = false;
3837 }
3838 #endif
3839
3840 return JNI_OK;
3841 }
3842
3843 jint Arguments::adjust_after_os() {
3844 if (UseNUMA) {
3845 if (UseParallelGC || UseParallelOldGC) {
3846 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3847 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3848 }
3849 }
3850 // UseNUMAInterleaving is set to ON for all collectors and
3851 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3852 // such as the parallel collector for Linux and Solaris will
3853 // interleave old gen and survivor spaces on top of NUMA
3854 // allocation policy for the eden space.
3855 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3856 // all platforms and ParallelGC on Windows will interleave all
3857 // of the heap spaces across NUMA nodes.
3858 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3859 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3860 }
3861 }
3862 return JNI_OK;
3863 }
3864
3865 int Arguments::PropertyList_count(SystemProperty* pl) {
3866 int count = 0;
3867 while(pl != NULL) {
3868 count++;
3869 pl = pl->next();
3870 }
3871 return count;
3872 }
3873
3874 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3875 assert(key != NULL, "just checking");
3876 SystemProperty* prop;
3877 for (prop = pl; prop != NULL; prop = prop->next()) {
3878 if (strcmp(key, prop->key()) == 0) return prop->value();
3879 }
3880 return NULL;
3881 }
3882
3883 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3884 int count = 0;
3885 const char* ret_val = NULL;
3886
3887 while(pl != NULL) {
3888 if(count >= index) {
3889 ret_val = pl->key();
3890 break;
3891 }
3892 count++;
3893 pl = pl->next();
3894 }
3895
3896 return ret_val;
3897 }
3898
3899 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3900 int count = 0;
3901 char* ret_val = NULL;
3902
3903 while(pl != NULL) {
3904 if(count >= index) {
3905 ret_val = pl->value();
3906 break;
3907 }
3908 count++;
3909 pl = pl->next();
3910 }
3911
3912 return ret_val;
3913 }
3914
3915 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3916 SystemProperty* p = *plist;
3917 if (p == NULL) {
3918 *plist = new_p;
3919 } else {
3920 while (p->next() != NULL) {
3921 p = p->next();
3922 }
3923 p->set_next(new_p);
3924 }
3925 }
3926
3927 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3928 if (plist == NULL)
3929 return;
3930
3931 SystemProperty* new_p = new SystemProperty(k, v, true);
3932 PropertyList_add(plist, new_p);
3933 }
3934
3935 // This add maintains unique property key in the list.
3936 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3937 if (plist == NULL)
3938 return;
3939
3940 // If property key exist then update with new value.
3941 SystemProperty* prop;
3942 for (prop = *plist; prop != NULL; prop = prop->next()) {
3943 if (strcmp(k, prop->key()) == 0) {
3944 if (append) {
3945 prop->append_value(v);
3946 } else {
3947 prop->set_value(v);
3948 }
3949 return;
3950 }
3951 }
3952
3953 PropertyList_add(plist, k, v);
3954 }
3955
3956 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3957 // Returns true if all of the source pointed by src has been copied over to
3958 // the destination buffer pointed by buf. Otherwise, returns false.
3959 // Notes:
3960 // 1. If the length (buflen) of the destination buffer excluding the
3961 // NULL terminator character is not long enough for holding the expanded
3962 // pid characters, it also returns false instead of returning the partially
3963 // expanded one.
3964 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3965 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3966 char* buf, size_t buflen) {
3967 const char* p = src;
3968 char* b = buf;
3969 const char* src_end = &src[srclen];
3970 char* buf_end = &buf[buflen - 1];
3971
3972 while (p < src_end && b < buf_end) {
3973 if (*p == '%') {
3974 switch (*(++p)) {
3975 case '%': // "%%" ==> "%"
3976 *b++ = *p++;
3977 break;
3978 case 'p': { // "%p" ==> current process id
3979 // buf_end points to the character before the last character so
3980 // that we could write '\0' to the end of the buffer.
3981 size_t buf_sz = buf_end - b + 1;
3982 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3983
3984 // if jio_snprintf fails or the buffer is not long enough to hold
3985 // the expanded pid, returns false.
3986 if (ret < 0 || ret >= (int)buf_sz) {
3987 return false;
3988 } else {
3989 b += ret;
3990 assert(*b == '\0', "fail in copy_expand_pid");
3991 if (p == src_end && b == buf_end + 1) {
3992 // reach the end of the buffer.
3993 return true;
3994 }
3995 }
3996 p++;
3997 break;
3998 }
3999 default :
4000 *b++ = '%';
4001 }
4002 } else {
4003 *b++ = *p++;
4004 }
4005 }
4006 *b = '\0';
4007 return (p == src_end); // return false if not all of the source was copied
4008 }