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