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_IS_DEFAULT(ProfiledCodeHeapSize) &&
1147 FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1148 intx non_method_size = ReservedCodeCacheSize - (ProfiledCodeHeapSize + NonProfiledCodeHeapSize);
1149
1150 // Multiply sizes by 5 but fix non_method_size (distribute among non-profiled and profiled code heap)
1151 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1152 FLAG_SET_DEFAULT(ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + non_method_size * 2);
1153 FLAG_SET_DEFAULT(NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + non_method_size * 2);
1154 }
1155 if (!UseInterpreter) { // -Xcomp
1156 Tier3InvokeNotifyFreqLog = 0;
1157 Tier4InvocationThreshold = 0;
1158 }
1159 }
1160
1161 #if INCLUDE_ALL_GCS
1162 static void disable_adaptive_size_policy(const char* collector_name) {
1163 if (UseAdaptiveSizePolicy) {
1164 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1165 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1166 collector_name);
1167 }
1168 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1169 }
1170 }
1171
1172 void Arguments::set_parnew_gc_flags() {
1173 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1174 "control point invariant");
1175 assert(UseParNewGC, "Error");
1176
1177 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1178 disable_adaptive_size_policy("UseParNewGC");
1179
1180 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1181 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1182 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1183 } else if (ParallelGCThreads == 0) {
1184 jio_fprintf(defaultStream::error_stream(),
1185 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1186 vm_exit(1);
1187 }
1188
1189 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1190 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1191 // we set them to 1024 and 1024.
1192 // See CR 6362902.
1193 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1194 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1195 }
1196 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1197 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1198 }
1199
1200 // When using compressed oops, we use local overflow stacks,
1201 // rather than using a global overflow list chained through
1202 // the klass word of the object's pre-image.
1203 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1204 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1205 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1206 }
1207 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1208 }
1209 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1210 }
1211
1212 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1213 // sparc/solaris for certain applications, but would gain from
1214 // further optimization and tuning efforts, and would almost
1215 // certainly gain from analysis of platform and environment.
1216 void Arguments::set_cms_and_parnew_gc_flags() {
1217 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1218 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1219
1220 // If we are using CMS, we prefer to UseParNewGC,
1221 // unless explicitly forbidden.
1222 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1223 FLAG_SET_ERGO(bool, UseParNewGC, true);
1224 }
1225
1226 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1227 disable_adaptive_size_policy("UseConcMarkSweepGC");
1228
1229 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1230 // as needed.
1231 if (UseParNewGC) {
1232 set_parnew_gc_flags();
1233 }
1234
1235 size_t max_heap = align_size_down(MaxHeapSize,
1236 CardTableRS::ct_max_alignment_constraint());
1237
1238 // Now make adjustments for CMS
1239 intx tenuring_default = (intx)6;
1240 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1241
1242 // Preferred young gen size for "short" pauses:
1243 // upper bound depends on # of threads and NewRatio.
1244 const uintx parallel_gc_threads =
1245 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1246 const size_t preferred_max_new_size_unaligned =
1247 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1248 size_t preferred_max_new_size =
1249 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1250
1251 // Unless explicitly requested otherwise, size young gen
1252 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1253
1254 // If either MaxNewSize or NewRatio is set on the command line,
1255 // assume the user is trying to set the size of the young gen.
1256 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1257
1258 // Set MaxNewSize to our calculated preferred_max_new_size unless
1259 // NewSize was set on the command line and it is larger than
1260 // preferred_max_new_size.
1261 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1262 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1263 } else {
1264 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1265 }
1266 if (PrintGCDetails && Verbose) {
1267 // Too early to use gclog_or_tty
1268 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1269 }
1270
1271 // Code along this path potentially sets NewSize and OldSize
1272 if (PrintGCDetails && Verbose) {
1273 // Too early to use gclog_or_tty
1274 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1275 " initial_heap_size: " SIZE_FORMAT
1276 " max_heap: " SIZE_FORMAT,
1277 min_heap_size(), InitialHeapSize, max_heap);
1278 }
1279 size_t min_new = preferred_max_new_size;
1280 if (FLAG_IS_CMDLINE(NewSize)) {
1281 min_new = NewSize;
1282 }
1283 if (max_heap > min_new && min_heap_size() > min_new) {
1284 // Unless explicitly requested otherwise, make young gen
1285 // at least min_new, and at most preferred_max_new_size.
1286 if (FLAG_IS_DEFAULT(NewSize)) {
1287 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1288 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1289 if (PrintGCDetails && Verbose) {
1290 // Too early to use gclog_or_tty
1291 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1292 }
1293 }
1294 // Unless explicitly requested otherwise, size old gen
1295 // so it's NewRatio x of NewSize.
1296 if (FLAG_IS_DEFAULT(OldSize)) {
1297 if (max_heap > NewSize) {
1298 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1299 if (PrintGCDetails && Verbose) {
1300 // Too early to use gclog_or_tty
1301 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1302 }
1303 }
1304 }
1305 }
1306 }
1307 // Unless explicitly requested otherwise, definitely
1308 // promote all objects surviving "tenuring_default" scavenges.
1309 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1310 FLAG_IS_DEFAULT(SurvivorRatio)) {
1311 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1312 }
1313 // If we decided above (or user explicitly requested)
1314 // `promote all' (via MaxTenuringThreshold := 0),
1315 // prefer minuscule survivor spaces so as not to waste
1316 // space for (non-existent) survivors
1317 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1318 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1319 }
1320 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1321 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1322 // This is done in order to make ParNew+CMS configuration to work
1323 // with YoungPLABSize and OldPLABSize options.
1324 // See CR 6362902.
1325 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1326 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1327 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1328 // is. In this situation let CMSParPromoteBlocksToClaim follow
1329 // the value (either from the command line or ergonomics) of
1330 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1331 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1332 } else {
1333 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1334 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1335 // we'll let it to take precedence.
1336 jio_fprintf(defaultStream::error_stream(),
1337 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1338 " options are specified for the CMS collector."
1339 " CMSParPromoteBlocksToClaim will take precedence.\n");
1340 }
1341 }
1342 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1343 // OldPLAB sizing manually turned off: Use a larger default setting,
1344 // unless it was manually specified. This is because a too-low value
1345 // will slow down scavenges.
1346 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1347 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1348 }
1349 }
1350 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1351 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1352 // If either of the static initialization defaults have changed, note this
1353 // modification.
1354 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1355 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1356 }
1357 if (PrintGCDetails && Verbose) {
1358 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1359 MarkStackSize / K, MarkStackSizeMax / K);
1360 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1361 }
1362 }
1363 #endif // INCLUDE_ALL_GCS
1364
1365 void set_object_alignment() {
1366 // Object alignment.
1367 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1368 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1369 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1370 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1371 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1372 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1373
1374 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1375 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1376
1377 // Oop encoding heap max
1378 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1379
1380 #if INCLUDE_ALL_GCS
1381 // Set CMS global values
1382 CompactibleFreeListSpace::set_cms_values();
1383 #endif // INCLUDE_ALL_GCS
1384 }
1385
1386 bool verify_object_alignment() {
1387 // Object alignment.
1388 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1389 jio_fprintf(defaultStream::error_stream(),
1390 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1391 (int)ObjectAlignmentInBytes);
1392 return false;
1393 }
1394 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1395 jio_fprintf(defaultStream::error_stream(),
1396 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1397 (int)ObjectAlignmentInBytes, BytesPerLong);
1398 return false;
1399 }
1400 // It does not make sense to have big object alignment
1401 // since a space lost due to alignment will be greater
1402 // then a saved space from compressed oops.
1403 if ((int)ObjectAlignmentInBytes > 256) {
1404 jio_fprintf(defaultStream::error_stream(),
1405 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1406 (int)ObjectAlignmentInBytes);
1407 return false;
1408 }
1409 // In case page size is very small.
1410 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1411 jio_fprintf(defaultStream::error_stream(),
1412 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1413 (int)ObjectAlignmentInBytes, os::vm_page_size());
1414 return false;
1415 }
1416 return true;
1417 }
1418
1419 uintx Arguments::max_heap_for_compressed_oops() {
1420 // Avoid sign flip.
1421 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1422 // We need to fit both the NULL page and the heap into the memory budget, while
1423 // keeping alignment constraints of the heap. To guarantee the latter, as the
1424 // NULL page is located before the heap, we pad the NULL page to the conservative
1425 // maximum alignment that the GC may ever impose upon the heap.
1426 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1427 _conservative_max_heap_alignment);
1428
1429 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1430 NOT_LP64(ShouldNotReachHere(); return 0);
1431 }
1432
1433 bool Arguments::should_auto_select_low_pause_collector() {
1434 if (UseAutoGCSelectPolicy &&
1435 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1436 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1437 if (PrintGCDetails) {
1438 // Cannot use gclog_or_tty yet.
1439 tty->print_cr("Automatic selection of the low pause collector"
1440 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1441 }
1442 return true;
1443 }
1444 return false;
1445 }
1446
1447 void Arguments::set_use_compressed_oops() {
1448 #ifndef ZERO
1449 #ifdef _LP64
1450 // MaxHeapSize is not set up properly at this point, but
1451 // the only value that can override MaxHeapSize if we are
1452 // to use UseCompressedOops is InitialHeapSize.
1453 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1454
1455 if (max_heap_size <= max_heap_for_compressed_oops()) {
1456 #if !defined(COMPILER1) || defined(TIERED)
1457 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1458 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1459 }
1460 #endif
1461 #ifdef _WIN64
1462 if (UseLargePages && UseCompressedOops) {
1463 // Cannot allocate guard pages for implicit checks in indexed addressing
1464 // mode, when large pages are specified on windows.
1465 // This flag could be switched ON if narrow oop base address is set to 0,
1466 // see code in Universe::initialize_heap().
1467 Universe::set_narrow_oop_use_implicit_null_checks(false);
1468 }
1469 #endif // _WIN64
1470 } else {
1471 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1472 warning("Max heap size too large for Compressed Oops");
1473 FLAG_SET_DEFAULT(UseCompressedOops, false);
1474 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1475 }
1476 }
1477 #endif // _LP64
1478 #endif // ZERO
1479 }
1480
1481
1482 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1483 // set_use_compressed_oops().
1484 void Arguments::set_use_compressed_klass_ptrs() {
1485 #ifndef ZERO
1486 #ifdef _LP64
1487 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1488 if (!UseCompressedOops) {
1489 if (UseCompressedClassPointers) {
1490 warning("UseCompressedClassPointers requires UseCompressedOops");
1491 }
1492 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1493 } else {
1494 // Turn on UseCompressedClassPointers too
1495 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1496 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1497 }
1498 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1499 if (UseCompressedClassPointers) {
1500 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1501 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1502 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1503 }
1504 }
1505 }
1506 #endif // _LP64
1507 #endif // !ZERO
1508 }
1509
1510 void Arguments::set_conservative_max_heap_alignment() {
1511 // The conservative maximum required alignment for the heap is the maximum of
1512 // the alignments imposed by several sources: any requirements from the heap
1513 // itself, the collector policy and the maximum page size we may run the VM
1514 // with.
1515 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1516 #if INCLUDE_ALL_GCS
1517 if (UseParallelGC) {
1518 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1519 } else if (UseG1GC) {
1520 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1521 }
1522 #endif // INCLUDE_ALL_GCS
1523 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(),
1524 CollectorPolicy::compute_heap_alignment());
1525 }
1526
1527 void Arguments::set_ergonomics_flags() {
1528
1529 if (os::is_server_class_machine()) {
1530 // If no other collector is requested explicitly,
1531 // let the VM select the collector based on
1532 // machine class and automatic selection policy.
1533 if (!UseSerialGC &&
1534 !UseConcMarkSweepGC &&
1535 !UseG1GC &&
1536 !UseParNewGC &&
1537 FLAG_IS_DEFAULT(UseParallelGC)) {
1538 if (should_auto_select_low_pause_collector()) {
1539 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1540 } else {
1541 FLAG_SET_ERGO(bool, UseParallelGC, true);
1542 }
1543 }
1544 }
1545 #ifdef COMPILER2
1546 // Shared spaces work fine with other GCs but causes bytecode rewriting
1547 // to be disabled, which hurts interpreter performance and decreases
1548 // server performance. When -server is specified, keep the default off
1549 // unless it is asked for. Future work: either add bytecode rewriting
1550 // at link time, or rewrite bytecodes in non-shared methods.
1551 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1552 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1553 no_shared_spaces();
1554 }
1555 #endif
1556
1557 set_conservative_max_heap_alignment();
1558
1559 #ifndef ZERO
1560 #ifdef _LP64
1561 set_use_compressed_oops();
1562
1563 // set_use_compressed_klass_ptrs() must be called after calling
1564 // set_use_compressed_oops().
1565 set_use_compressed_klass_ptrs();
1566
1567 // Also checks that certain machines are slower with compressed oops
1568 // in vm_version initialization code.
1569 #endif // _LP64
1570 #endif // !ZERO
1571 }
1572
1573 void Arguments::set_parallel_gc_flags() {
1574 assert(UseParallelGC || UseParallelOldGC, "Error");
1575 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1576 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1577 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1578 }
1579 FLAG_SET_DEFAULT(UseParallelGC, true);
1580
1581 // If no heap maximum was requested explicitly, use some reasonable fraction
1582 // of the physical memory, up to a maximum of 1GB.
1583 FLAG_SET_DEFAULT(ParallelGCThreads,
1584 Abstract_VM_Version::parallel_worker_threads());
1585 if (ParallelGCThreads == 0) {
1586 jio_fprintf(defaultStream::error_stream(),
1587 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1588 vm_exit(1);
1589 }
1590
1591 if (UseAdaptiveSizePolicy) {
1592 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1593 // unless the user actually sets these flags.
1594 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1595 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1596 }
1597 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1598 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1599 }
1600 }
1601
1602 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1603 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1604 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1605 // See CR 6362902 for details.
1606 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1607 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1608 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1609 }
1610 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1611 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1612 }
1613 }
1614
1615 if (UseParallelOldGC) {
1616 // Par compact uses lower default values since they are treated as
1617 // minimums. These are different defaults because of the different
1618 // interpretation and are not ergonomically set.
1619 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1620 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1621 }
1622 }
1623 }
1624
1625 void Arguments::set_g1_gc_flags() {
1626 assert(UseG1GC, "Error");
1627 #ifdef COMPILER1
1628 FastTLABRefill = false;
1629 #endif
1630 FLAG_SET_DEFAULT(ParallelGCThreads,
1631 Abstract_VM_Version::parallel_worker_threads());
1632 if (ParallelGCThreads == 0) {
1633 FLAG_SET_DEFAULT(ParallelGCThreads,
1634 Abstract_VM_Version::parallel_worker_threads());
1635 }
1636
1637 // MarkStackSize will be set (if it hasn't been set by the user)
1638 // when concurrent marking is initialized.
1639 // Its value will be based upon the number of parallel marking threads.
1640 // But we do set the maximum mark stack size here.
1641 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1642 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1643 }
1644
1645 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1646 // In G1, we want the default GC overhead goal to be higher than
1647 // say in PS. So we set it here to 10%. Otherwise the heap might
1648 // be expanded more aggressively than we would like it to. In
1649 // fact, even 10% seems to not be high enough in some cases
1650 // (especially small GC stress tests that the main thing they do
1651 // is allocation). We might consider increase it further.
1652 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1653 }
1654
1655 if (PrintGCDetails && Verbose) {
1656 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1657 MarkStackSize / K, MarkStackSizeMax / K);
1658 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1659 }
1660 }
1661
1662 julong Arguments::limit_by_allocatable_memory(julong limit) {
1663 julong max_allocatable;
1664 julong result = limit;
1665 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1666 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1667 }
1668 return result;
1669 }
1670
1671 // Use static initialization to get the default before parsing
1672 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1673
1674 void Arguments::set_heap_size() {
1675 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1676 // Deprecated flag
1677 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1678 }
1679
1680 const julong phys_mem =
1681 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1682 : (julong)MaxRAM;
1683
1684 // If the maximum heap size has not been set with -Xmx,
1685 // then set it as fraction of the size of physical memory,
1686 // respecting the maximum and minimum sizes of the heap.
1687 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1688 julong reasonable_max = phys_mem / MaxRAMFraction;
1689
1690 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1691 // Small physical memory, so use a minimum fraction of it for the heap
1692 reasonable_max = phys_mem / MinRAMFraction;
1693 } else {
1694 // Not-small physical memory, so require a heap at least
1695 // as large as MaxHeapSize
1696 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1697 }
1698 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1699 // Limit the heap size to ErgoHeapSizeLimit
1700 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1701 }
1702 if (UseCompressedOops) {
1703 // Limit the heap size to the maximum possible when using compressed oops
1704 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1705
1706 // HeapBaseMinAddress can be greater than default but not less than.
1707 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1708 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1709 // matches compressed oops printing flags
1710 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1711 jio_fprintf(defaultStream::error_stream(),
1712 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1713 " (" UINTX_FORMAT "G) which is greater than value given "
1714 UINTX_FORMAT "\n",
1715 DefaultHeapBaseMinAddress,
1716 DefaultHeapBaseMinAddress/G,
1717 HeapBaseMinAddress);
1718 }
1719 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1720 }
1721 }
1722
1723 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1724 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1725 // but it should be not less than default MaxHeapSize.
1726 max_coop_heap -= HeapBaseMinAddress;
1727 }
1728 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1729 }
1730 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1731
1732 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1733 // An initial heap size was specified on the command line,
1734 // so be sure that the maximum size is consistent. Done
1735 // after call to limit_by_allocatable_memory because that
1736 // method might reduce the allocation size.
1737 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1738 }
1739
1740 if (PrintGCDetails && Verbose) {
1741 // Cannot use gclog_or_tty yet.
1742 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1743 }
1744 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1745 }
1746
1747 // If the minimum or initial heap_size have not been set or requested to be set
1748 // ergonomically, set them accordingly.
1749 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1750 julong reasonable_minimum = (julong)(OldSize + NewSize);
1751
1752 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1753
1754 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1755
1756 if (InitialHeapSize == 0) {
1757 julong reasonable_initial = phys_mem / InitialRAMFraction;
1758
1759 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1760 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1761
1762 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1763
1764 if (PrintGCDetails && Verbose) {
1765 // Cannot use gclog_or_tty yet.
1766 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1767 }
1768 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1769 }
1770 // If the minimum heap size has not been set (via -Xms),
1771 // synchronize with InitialHeapSize to avoid errors with the default value.
1772 if (min_heap_size() == 0) {
1773 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1774 if (PrintGCDetails && Verbose) {
1775 // Cannot use gclog_or_tty yet.
1776 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1777 }
1778 }
1779 }
1780 }
1781
1782 // This must be called after ergonomics because we want bytecode rewriting
1783 // if the server compiler is used, or if UseSharedSpaces is disabled.
1784 void Arguments::set_bytecode_flags() {
1785 // Better not attempt to store into a read-only space.
1786 if (UseSharedSpaces) {
1787 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1788 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1789 }
1790
1791 if (!RewriteBytecodes) {
1792 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1793 }
1794 }
1795
1796 // Aggressive optimization flags -XX:+AggressiveOpts
1797 void Arguments::set_aggressive_opts_flags() {
1798 #ifdef COMPILER2
1799 if (AggressiveUnboxing) {
1800 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1801 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1802 } else if (!EliminateAutoBox) {
1803 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1804 AggressiveUnboxing = false;
1805 }
1806 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1807 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1808 } else if (!DoEscapeAnalysis) {
1809 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1810 AggressiveUnboxing = false;
1811 }
1812 }
1813 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1814 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1815 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1816 }
1817 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1818 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1819 }
1820
1821 // Feed the cache size setting into the JDK
1822 char buffer[1024];
1823 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1824 add_property(buffer);
1825 }
1826 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1827 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1828 }
1829 #endif
1830
1831 if (AggressiveOpts) {
1832 // Sample flag setting code
1833 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1834 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1835 // }
1836 }
1837 }
1838
1839 //===========================================================================================================
1840 // Parsing of java.compiler property
1841
1842 void Arguments::process_java_compiler_argument(char* arg) {
1843 // For backwards compatibility, Djava.compiler=NONE or ""
1844 // causes us to switch to -Xint mode UNLESS -Xdebug
1845 // is also specified.
1846 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1847 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1848 }
1849 }
1850
1851 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1852 _sun_java_launcher = strdup(launcher);
1853 }
1854
1855 bool Arguments::created_by_java_launcher() {
1856 assert(_sun_java_launcher != NULL, "property must have value");
1857 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1858 }
1859
1860 bool Arguments::sun_java_launcher_is_altjvm() {
1861 return _sun_java_launcher_is_altjvm;
1862 }
1863
1864 //===========================================================================================================
1865 // Parsing of main arguments
1866
1867 bool Arguments::verify_interval(uintx val, uintx min,
1868 uintx max, const char* name) {
1869 // Returns true iff value is in the inclusive interval [min..max]
1870 // false, otherwise.
1871 if (val >= min && val <= max) {
1872 return true;
1873 }
1874 jio_fprintf(defaultStream::error_stream(),
1875 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1876 " and " UINTX_FORMAT "\n",
1877 name, val, min, max);
1878 return false;
1879 }
1880
1881 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1882 // Returns true if given value is at least specified min threshold
1883 // false, otherwise.
1884 if (val >= min ) {
1885 return true;
1886 }
1887 jio_fprintf(defaultStream::error_stream(),
1888 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1889 name, val, min);
1890 return false;
1891 }
1892
1893 bool Arguments::verify_percentage(uintx value, const char* name) {
1894 if (is_percentage(value)) {
1895 return true;
1896 }
1897 jio_fprintf(defaultStream::error_stream(),
1898 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1899 name, value);
1900 return false;
1901 }
1902
1903 #if !INCLUDE_ALL_GCS
1904 #ifdef ASSERT
1905 static bool verify_serial_gc_flags() {
1906 return (UseSerialGC &&
1907 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1908 UseParallelGC || UseParallelOldGC));
1909 }
1910 #endif // ASSERT
1911 #endif // INCLUDE_ALL_GCS
1912
1913 // check if do gclog rotation
1914 // +UseGCLogFileRotation is a must,
1915 // no gc log rotation when log file not supplied or
1916 // NumberOfGCLogFiles is 0
1917 void check_gclog_consistency() {
1918 if (UseGCLogFileRotation) {
1919 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1920 jio_fprintf(defaultStream::output_stream(),
1921 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1922 "where num_of_file > 0\n"
1923 "GC log rotation is turned off\n");
1924 UseGCLogFileRotation = false;
1925 }
1926 }
1927
1928 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1929 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1930 jio_fprintf(defaultStream::output_stream(),
1931 "GCLogFileSize changed to minimum 8K\n");
1932 }
1933 }
1934
1935 // This function is called for -Xloggc:<filename>, it can be used
1936 // to check if a given file name(or string) conforms to the following
1937 // specification:
1938 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1939 // %p and %t only allowed once. We only limit usage of filename not path
1940 bool is_filename_valid(const char *file_name) {
1941 const char* p = file_name;
1942 char file_sep = os::file_separator()[0];
1943 const char* cp;
1944 // skip prefix path
1945 for (cp = file_name; *cp != '\0'; cp++) {
1946 if (*cp == '/' || *cp == file_sep) {
1947 p = cp + 1;
1948 }
1949 }
1950
1951 int count_p = 0;
1952 int count_t = 0;
1953 while (*p != '\0') {
1954 if ((*p >= '0' && *p <= '9') ||
1955 (*p >= 'A' && *p <= 'Z') ||
1956 (*p >= 'a' && *p <= 'z') ||
1957 *p == '-' ||
1958 *p == '_' ||
1959 *p == '.') {
1960 p++;
1961 continue;
1962 }
1963 if (*p == '%') {
1964 if(*(p + 1) == 'p') {
1965 p += 2;
1966 count_p ++;
1967 continue;
1968 }
1969 if (*(p + 1) == 't') {
1970 p += 2;
1971 count_t ++;
1972 continue;
1973 }
1974 }
1975 return false;
1976 }
1977 return count_p < 2 && count_t < 2;
1978 }
1979
1980 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
1981 if (!is_percentage(min_heap_free_ratio)) {
1982 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
1983 return false;
1984 }
1985 if (min_heap_free_ratio > MaxHeapFreeRatio) {
1986 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1987 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
1988 MaxHeapFreeRatio);
1989 return false;
1990 }
1991 return true;
1992 }
1993
1994 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
1995 if (!is_percentage(max_heap_free_ratio)) {
1996 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
1997 return false;
1998 }
1999 if (max_heap_free_ratio < MinHeapFreeRatio) {
2000 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2001 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2002 MinHeapFreeRatio);
2003 return false;
2004 }
2005 return true;
2006 }
2007
2008 // Check consistency of GC selection
2009 bool Arguments::check_gc_consistency() {
2010 check_gclog_consistency();
2011 bool status = true;
2012 // Ensure that the user has not selected conflicting sets
2013 // of collectors. [Note: this check is merely a user convenience;
2014 // collectors over-ride each other so that only a non-conflicting
2015 // set is selected; however what the user gets is not what they
2016 // may have expected from the combination they asked for. It's
2017 // better to reduce user confusion by not allowing them to
2018 // select conflicting combinations.
2019 uint i = 0;
2020 if (UseSerialGC) i++;
2021 if (UseConcMarkSweepGC || UseParNewGC) i++;
2022 if (UseParallelGC || UseParallelOldGC) i++;
2023 if (UseG1GC) i++;
2024 if (i > 1) {
2025 jio_fprintf(defaultStream::error_stream(),
2026 "Conflicting collector combinations in option list; "
2027 "please refer to the release notes for the combinations "
2028 "allowed\n");
2029 status = false;
2030 }
2031 return status;
2032 }
2033
2034 void Arguments::check_deprecated_gcs() {
2035 if (UseConcMarkSweepGC && !UseParNewGC) {
2036 warning("Using the DefNew young collector with the CMS collector is deprecated "
2037 "and will likely be removed in a future release");
2038 }
2039
2040 if (UseParNewGC && !UseConcMarkSweepGC) {
2041 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2042 // set up UseSerialGC properly, so that can't be used in the check here.
2043 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2044 "and will likely be removed in a future release");
2045 }
2046
2047 if (CMSIncrementalMode) {
2048 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2049 }
2050 }
2051
2052 void Arguments::check_deprecated_gc_flags() {
2053 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2054 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2055 "and will likely be removed in future release");
2056 }
2057 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2058 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2059 "Use MaxRAMFraction instead.");
2060 }
2061 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2062 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2063 }
2064 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2065 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2066 }
2067 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2068 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2069 }
2070 }
2071
2072 // Check stack pages settings
2073 bool Arguments::check_stack_pages()
2074 {
2075 bool status = true;
2076 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2077 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2078 // greater stack shadow pages can't generate instruction to bang stack
2079 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2080 return status;
2081 }
2082
2083 // Check the consistency of vm_init_args
2084 bool Arguments::check_vm_args_consistency() {
2085 // Method for adding checks for flag consistency.
2086 // The intent is to warn the user of all possible conflicts,
2087 // before returning an error.
2088 // Note: Needs platform-dependent factoring.
2089 bool status = true;
2090
2091 if (TLABRefillWasteFraction == 0) {
2092 jio_fprintf(defaultStream::error_stream(),
2093 "TLABRefillWasteFraction should be a denominator, "
2094 "not " SIZE_FORMAT "\n",
2095 TLABRefillWasteFraction);
2096 status = false;
2097 }
2098
2099 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2100 "AdaptiveSizePolicyWeight");
2101 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2102
2103 // Divide by bucket size to prevent a large size from causing rollover when
2104 // calculating amount of memory needed to be allocated for the String table.
2105 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2106 (max_uintx / StringTable::bucket_size()), "StringTable size");
2107
2108 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2109 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2110
2111 {
2112 // Using "else if" below to avoid printing two error messages if min > max.
2113 // This will also prevent us from reporting both min>100 and max>100 at the
2114 // same time, but that is less annoying than printing two identical errors IMHO.
2115 FormatBuffer<80> err_msg("");
2116 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2117 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2118 status = false;
2119 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2120 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2121 status = false;
2122 }
2123 }
2124
2125 // Min/MaxMetaspaceFreeRatio
2126 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2127 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2128
2129 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2130 jio_fprintf(defaultStream::error_stream(),
2131 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2132 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2133 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2134 MinMetaspaceFreeRatio,
2135 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2136 MaxMetaspaceFreeRatio);
2137 status = false;
2138 }
2139
2140 // Trying to keep 100% free is not practical
2141 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2142
2143 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2144 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2145 }
2146
2147 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2148 // Settings to encourage splitting.
2149 if (!FLAG_IS_CMDLINE(NewRatio)) {
2150 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2151 }
2152 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2153 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2154 }
2155 }
2156
2157 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2158 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2159 if (GCTimeLimit == 100) {
2160 // Turn off gc-overhead-limit-exceeded checks
2161 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2162 }
2163
2164 status = status && check_gc_consistency();
2165 status = status && check_stack_pages();
2166
2167 if (CMSIncrementalMode) {
2168 if (!UseConcMarkSweepGC) {
2169 jio_fprintf(defaultStream::error_stream(),
2170 "error: invalid argument combination.\n"
2171 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2172 "selected in order\nto use CMSIncrementalMode.\n");
2173 status = false;
2174 } else {
2175 status = status && verify_percentage(CMSIncrementalDutyCycle,
2176 "CMSIncrementalDutyCycle");
2177 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2178 "CMSIncrementalDutyCycleMin");
2179 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2180 "CMSIncrementalSafetyFactor");
2181 status = status && verify_percentage(CMSIncrementalOffset,
2182 "CMSIncrementalOffset");
2183 status = status && verify_percentage(CMSExpAvgFactor,
2184 "CMSExpAvgFactor");
2185 // If it was not set on the command line, set
2186 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2187 if (CMSInitiatingOccupancyFraction < 0) {
2188 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2189 }
2190 }
2191 }
2192
2193 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2194 // insists that we hold the requisite locks so that the iteration is
2195 // MT-safe. For the verification at start-up and shut-down, we don't
2196 // yet have a good way of acquiring and releasing these locks,
2197 // which are not visible at the CollectedHeap level. We want to
2198 // be able to acquire these locks and then do the iteration rather
2199 // than just disable the lock verification. This will be fixed under
2200 // bug 4788986.
2201 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2202 if (VerifyDuringStartup) {
2203 warning("Heap verification at start-up disabled "
2204 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2205 VerifyDuringStartup = false; // Disable verification at start-up
2206 }
2207
2208 if (VerifyBeforeExit) {
2209 warning("Heap verification at shutdown disabled "
2210 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2211 VerifyBeforeExit = false; // Disable verification at shutdown
2212 }
2213 }
2214
2215 // Note: only executed in non-PRODUCT mode
2216 if (!UseAsyncConcMarkSweepGC &&
2217 (ExplicitGCInvokesConcurrent ||
2218 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2219 jio_fprintf(defaultStream::error_stream(),
2220 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2221 " with -UseAsyncConcMarkSweepGC");
2222 status = false;
2223 }
2224
2225 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2226
2227 #if INCLUDE_ALL_GCS
2228 if (UseG1GC) {
2229 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2230 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2231 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2232
2233 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2234 "InitiatingHeapOccupancyPercent");
2235 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2236 "G1RefProcDrainInterval");
2237 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2238 "G1ConcMarkStepDurationMillis");
2239 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2240 "G1ConcRSHotCardLimit");
2241 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2242 "G1ConcRSLogCacheSize");
2243 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2244 "StringDeduplicationAgeThreshold");
2245 }
2246 if (UseConcMarkSweepGC) {
2247 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2248 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2249 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2250 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2251
2252 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2253
2254 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2255 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2256 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2257
2258 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2259
2260 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2261 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2262
2263 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2264 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2265 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2266
2267 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2268
2269 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2270
2271 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2272 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2273 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2274 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2275 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2276 }
2277
2278 if (UseParallelGC || UseParallelOldGC) {
2279 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2280 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2281
2282 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2283 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2284
2285 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2286 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2287
2288 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2289
2290 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2291 }
2292 #endif // INCLUDE_ALL_GCS
2293
2294 status = status && verify_interval(RefDiscoveryPolicy,
2295 ReferenceProcessor::DiscoveryPolicyMin,
2296 ReferenceProcessor::DiscoveryPolicyMax,
2297 "RefDiscoveryPolicy");
2298
2299 // Limit the lower bound of this flag to 1 as it is used in a division
2300 // expression.
2301 status = status && verify_interval(TLABWasteTargetPercent,
2302 1, 100, "TLABWasteTargetPercent");
2303
2304 status = status && verify_object_alignment();
2305
2306 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2307 "CompressedClassSpaceSize");
2308
2309 status = status && verify_interval(MarkStackSizeMax,
2310 1, (max_jint - 1), "MarkStackSizeMax");
2311 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2312
2313 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2314
2315 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2316
2317 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2318
2319 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2320 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2321
2322 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2323
2324 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2325 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2326 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2327 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2328
2329 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2330 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2331
2332 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2333 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2334 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2335
2336 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2337 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2338
2339 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2340 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2341 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2342 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2343
2344 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2345
2346 if (PrintNMTStatistics) {
2347 #if INCLUDE_NMT
2348 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2349 #endif // INCLUDE_NMT
2350 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2351 PrintNMTStatistics = false;
2352 #if INCLUDE_NMT
2353 }
2354 #endif
2355 }
2356
2357 // Need to limit the extent of the padding to reasonable size.
2358 // 8K is well beyond the reasonable HW cache line size, even with the
2359 // aggressive prefetching, while still leaving the room for segregating
2360 // among the distinct pages.
2361 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2362 jio_fprintf(defaultStream::error_stream(),
2363 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2364 ContendedPaddingWidth, 0, 8192);
2365 status = false;
2366 }
2367
2368 // Need to enforce the padding not to break the existing field alignments.
2369 // It is sufficient to check against the largest type size.
2370 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2371 jio_fprintf(defaultStream::error_stream(),
2372 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2373 ContendedPaddingWidth, BytesPerLong);
2374 status = false;
2375 }
2376
2377 // Check lower bounds of the code cache
2378 // Template Interpreter code is approximately 3X larger in debug builds.
2379 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2380 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2381 jio_fprintf(defaultStream::error_stream(),
2382 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2383 os::vm_page_size()/K);
2384 status = false;
2385 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2386 jio_fprintf(defaultStream::error_stream(),
2387 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2388 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2389 status = false;
2390 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2391 jio_fprintf(defaultStream::error_stream(),
2392 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2393 min_code_cache_size/K);
2394 status = false;
2395 } else if (ReservedCodeCacheSize > 2*G) {
2396 // Code cache size larger than MAXINT is not supported.
2397 jio_fprintf(defaultStream::error_stream(),
2398 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2399 (2*G)/M);
2400 status = false;
2401 } else if (NonMethodCodeHeapSize < min_code_cache_size){
2402 jio_fprintf(defaultStream::error_stream(),
2403 "Invalid NonMethodCodeHeapSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2404 min_code_cache_size/K);
2405 status = false;
2406 } else if ((!FLAG_IS_DEFAULT(NonMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2407 && (NonMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2408 jio_fprintf(defaultStream::error_stream(),
2409 "Invalid NonMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2410 (NonMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2411 status = false;
2412 }
2413
2414 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2415 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2416 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2417 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2418
2419 // TieredCompilation needs at least 2 compiler threads.
2420 const int num_min_compiler_threads = (TieredCompilation && (TieredStopAtLevel >= CompLevel_full_optimization)) ? 2 : 1;
2421 status &=verify_min_value(CICompilerCount, num_min_compiler_threads, "CICompilerCount");
2422
2423 return status;
2424 }
2425
2426 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2427 const char* option_type) {
2428 if (ignore) return false;
2429
2430 const char* spacer = " ";
2431 if (option_type == NULL) {
2432 option_type = ++spacer; // Set both to the empty string.
2433 }
2434
2435 if (os::obsolete_option(option)) {
2436 jio_fprintf(defaultStream::error_stream(),
2437 "Obsolete %s%soption: %s\n", option_type, spacer,
2438 option->optionString);
2439 return false;
2440 } else {
2441 jio_fprintf(defaultStream::error_stream(),
2442 "Unrecognized %s%soption: %s\n", option_type, spacer,
2443 option->optionString);
2444 return true;
2445 }
2446 }
2447
2448 static const char* user_assertion_options[] = {
2449 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2450 };
2451
2452 static const char* system_assertion_options[] = {
2453 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2454 };
2455
2456 // Return true if any of the strings in null-terminated array 'names' matches.
2457 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2458 // the option must match exactly.
2459 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2460 bool tail_allowed) {
2461 for (/* empty */; *names != NULL; ++names) {
2462 if (match_option(option, *names, tail)) {
2463 if (**tail == '\0' || tail_allowed && **tail == ':') {
2464 return true;
2465 }
2466 }
2467 }
2468 return false;
2469 }
2470
2471 bool Arguments::parse_uintx(const char* value,
2472 uintx* uintx_arg,
2473 uintx min_size) {
2474
2475 // Check the sign first since atomull() parses only unsigned values.
2476 bool value_is_positive = !(*value == '-');
2477
2478 if (value_is_positive) {
2479 julong n;
2480 bool good_return = atomull(value, &n);
2481 if (good_return) {
2482 bool above_minimum = n >= min_size;
2483 bool value_is_too_large = n > max_uintx;
2484
2485 if (above_minimum && !value_is_too_large) {
2486 *uintx_arg = n;
2487 return true;
2488 }
2489 }
2490 }
2491 return false;
2492 }
2493
2494 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2495 julong* long_arg,
2496 julong min_size) {
2497 if (!atomull(s, long_arg)) return arg_unreadable;
2498 return check_memory_size(*long_arg, min_size);
2499 }
2500
2501 // Parse JavaVMInitArgs structure
2502
2503 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2504 // For components of the system classpath.
2505 SysClassPath scp(Arguments::get_sysclasspath());
2506 bool scp_assembly_required = false;
2507
2508 // Save default settings for some mode flags
2509 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2510 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2511 Arguments::_ClipInlining = ClipInlining;
2512 Arguments::_BackgroundCompilation = BackgroundCompilation;
2513
2514 // Setup flags for mixed which is the default
2515 set_mode_flags(_mixed);
2516
2517 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2518 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2519 if (result != JNI_OK) {
2520 return result;
2521 }
2522
2523 // Parse JavaVMInitArgs structure passed in
2524 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2525 if (result != JNI_OK) {
2526 return result;
2527 }
2528
2529 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2530 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2531 if (result != JNI_OK) {
2532 return result;
2533 }
2534
2535 // Do final processing now that all arguments have been parsed
2536 result = finalize_vm_init_args(&scp, scp_assembly_required);
2537 if (result != JNI_OK) {
2538 return result;
2539 }
2540
2541 return JNI_OK;
2542 }
2543
2544 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2545 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2546 // are dealing with -agentpath (case where name is a path), otherwise with
2547 // -agentlib
2548 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2549 char *_name;
2550 const char *_hprof = "hprof", *_jdwp = "jdwp";
2551 size_t _len_hprof, _len_jdwp, _len_prefix;
2552
2553 if (is_path) {
2554 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2555 return false;
2556 }
2557
2558 _name++; // skip past last path separator
2559 _len_prefix = strlen(JNI_LIB_PREFIX);
2560
2561 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2562 return false;
2563 }
2564
2565 _name += _len_prefix;
2566 _len_hprof = strlen(_hprof);
2567 _len_jdwp = strlen(_jdwp);
2568
2569 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2570 _name += _len_hprof;
2571 }
2572 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2573 _name += _len_jdwp;
2574 }
2575 else {
2576 return false;
2577 }
2578
2579 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2580 return false;
2581 }
2582
2583 return true;
2584 }
2585
2586 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2587 return true;
2588 }
2589
2590 return false;
2591 }
2592
2593 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2594 SysClassPath* scp_p,
2595 bool* scp_assembly_required_p,
2596 Flag::Flags origin) {
2597 // Remaining part of option string
2598 const char* tail;
2599
2600 // iterate over arguments
2601 for (int index = 0; index < args->nOptions; index++) {
2602 bool is_absolute_path = false; // for -agentpath vs -agentlib
2603
2604 const JavaVMOption* option = args->options + index;
2605
2606 if (!match_option(option, "-Djava.class.path", &tail) &&
2607 !match_option(option, "-Dsun.java.command", &tail) &&
2608 !match_option(option, "-Dsun.java.launcher", &tail)) {
2609
2610 // add all jvm options to the jvm_args string. This string
2611 // is used later to set the java.vm.args PerfData string constant.
2612 // the -Djava.class.path and the -Dsun.java.command options are
2613 // omitted from jvm_args string as each have their own PerfData
2614 // string constant object.
2615 build_jvm_args(option->optionString);
2616 }
2617
2618 // -verbose:[class/gc/jni]
2619 if (match_option(option, "-verbose", &tail)) {
2620 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2621 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2622 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2623 } else if (!strcmp(tail, ":gc")) {
2624 FLAG_SET_CMDLINE(bool, PrintGC, true);
2625 } else if (!strcmp(tail, ":jni")) {
2626 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2627 }
2628 // -da / -ea / -disableassertions / -enableassertions
2629 // These accept an optional class/package name separated by a colon, e.g.,
2630 // -da:java.lang.Thread.
2631 } else if (match_option(option, user_assertion_options, &tail, true)) {
2632 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2633 if (*tail == '\0') {
2634 JavaAssertions::setUserClassDefault(enable);
2635 } else {
2636 assert(*tail == ':', "bogus match by match_option()");
2637 JavaAssertions::addOption(tail + 1, enable);
2638 }
2639 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2640 } else if (match_option(option, system_assertion_options, &tail, false)) {
2641 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2642 JavaAssertions::setSystemClassDefault(enable);
2643 // -bootclasspath:
2644 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2645 scp_p->reset_path(tail);
2646 *scp_assembly_required_p = true;
2647 // -bootclasspath/a:
2648 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2649 scp_p->add_suffix(tail);
2650 *scp_assembly_required_p = true;
2651 // -bootclasspath/p:
2652 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2653 scp_p->add_prefix(tail);
2654 *scp_assembly_required_p = true;
2655 // -Xrun
2656 } else if (match_option(option, "-Xrun", &tail)) {
2657 if (tail != NULL) {
2658 const char* pos = strchr(tail, ':');
2659 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2660 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2661 name[len] = '\0';
2662
2663 char *options = NULL;
2664 if(pos != NULL) {
2665 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2666 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2667 }
2668 #if !INCLUDE_JVMTI
2669 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2670 jio_fprintf(defaultStream::error_stream(),
2671 "Profiling and debugging agents are not supported in this VM\n");
2672 return JNI_ERR;
2673 }
2674 #endif // !INCLUDE_JVMTI
2675 add_init_library(name, options);
2676 }
2677 // -agentlib and -agentpath
2678 } else if (match_option(option, "-agentlib:", &tail) ||
2679 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2680 if(tail != NULL) {
2681 const char* pos = strchr(tail, '=');
2682 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2683 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2684 name[len] = '\0';
2685
2686 char *options = NULL;
2687 if(pos != NULL) {
2688 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2689 }
2690 #if !INCLUDE_JVMTI
2691 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2692 jio_fprintf(defaultStream::error_stream(),
2693 "Profiling and debugging agents are not supported in this VM\n");
2694 return JNI_ERR;
2695 }
2696 #endif // !INCLUDE_JVMTI
2697 add_init_agent(name, options, is_absolute_path);
2698 }
2699 // -javaagent
2700 } else if (match_option(option, "-javaagent:", &tail)) {
2701 #if !INCLUDE_JVMTI
2702 jio_fprintf(defaultStream::error_stream(),
2703 "Instrumentation agents are not supported in this VM\n");
2704 return JNI_ERR;
2705 #else
2706 if(tail != NULL) {
2707 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2708 add_init_agent("instrument", options, false);
2709 }
2710 #endif // !INCLUDE_JVMTI
2711 // -Xnoclassgc
2712 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2713 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2714 // -Xincgc: i-CMS
2715 } else if (match_option(option, "-Xincgc", &tail)) {
2716 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2717 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2718 // -Xnoincgc: no i-CMS
2719 } else if (match_option(option, "-Xnoincgc", &tail)) {
2720 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2721 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2722 // -Xconcgc
2723 } else if (match_option(option, "-Xconcgc", &tail)) {
2724 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2725 // -Xnoconcgc
2726 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2727 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2728 // -Xbatch
2729 } else if (match_option(option, "-Xbatch", &tail)) {
2730 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2731 // -Xmn for compatibility with other JVM vendors
2732 } else if (match_option(option, "-Xmn", &tail)) {
2733 julong long_initial_young_size = 0;
2734 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2735 if (errcode != arg_in_range) {
2736 jio_fprintf(defaultStream::error_stream(),
2737 "Invalid initial young generation size: %s\n", option->optionString);
2738 describe_range_error(errcode);
2739 return JNI_EINVAL;
2740 }
2741 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2742 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2743 // -Xms
2744 } else if (match_option(option, "-Xms", &tail)) {
2745 julong long_initial_heap_size = 0;
2746 // an initial heap size of 0 means automatically determine
2747 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2748 if (errcode != arg_in_range) {
2749 jio_fprintf(defaultStream::error_stream(),
2750 "Invalid initial heap size: %s\n", option->optionString);
2751 describe_range_error(errcode);
2752 return JNI_EINVAL;
2753 }
2754 set_min_heap_size((uintx)long_initial_heap_size);
2755 // Currently the minimum size and the initial heap sizes are the same.
2756 // Can be overridden with -XX:InitialHeapSize.
2757 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2758 // -Xmx
2759 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2760 julong long_max_heap_size = 0;
2761 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2762 if (errcode != arg_in_range) {
2763 jio_fprintf(defaultStream::error_stream(),
2764 "Invalid maximum heap size: %s\n", option->optionString);
2765 describe_range_error(errcode);
2766 return JNI_EINVAL;
2767 }
2768 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2769 // Xmaxf
2770 } else if (match_option(option, "-Xmaxf", &tail)) {
2771 char* err;
2772 int maxf = (int)(strtod(tail, &err) * 100);
2773 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2774 jio_fprintf(defaultStream::error_stream(),
2775 "Bad max heap free percentage size: %s\n",
2776 option->optionString);
2777 return JNI_EINVAL;
2778 } else {
2779 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2780 }
2781 // Xminf
2782 } else if (match_option(option, "-Xminf", &tail)) {
2783 char* err;
2784 int minf = (int)(strtod(tail, &err) * 100);
2785 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2786 jio_fprintf(defaultStream::error_stream(),
2787 "Bad min heap free percentage size: %s\n",
2788 option->optionString);
2789 return JNI_EINVAL;
2790 } else {
2791 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2792 }
2793 // -Xss
2794 } else if (match_option(option, "-Xss", &tail)) {
2795 julong long_ThreadStackSize = 0;
2796 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2797 if (errcode != arg_in_range) {
2798 jio_fprintf(defaultStream::error_stream(),
2799 "Invalid thread stack size: %s\n", option->optionString);
2800 describe_range_error(errcode);
2801 return JNI_EINVAL;
2802 }
2803 // Internally track ThreadStackSize in units of 1024 bytes.
2804 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2805 round_to((int)long_ThreadStackSize, K) / K);
2806 // -Xoss
2807 } else if (match_option(option, "-Xoss", &tail)) {
2808 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2809 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2810 julong long_CodeCacheExpansionSize = 0;
2811 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2812 if (errcode != arg_in_range) {
2813 jio_fprintf(defaultStream::error_stream(),
2814 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2815 os::vm_page_size()/K);
2816 return JNI_EINVAL;
2817 }
2818 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2819 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2820 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2821 julong long_ReservedCodeCacheSize = 0;
2822
2823 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2824 if (errcode != arg_in_range) {
2825 jio_fprintf(defaultStream::error_stream(),
2826 "Invalid maximum code cache size: %s.\n", option->optionString);
2827 return JNI_EINVAL;
2828 }
2829 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2830 // -XX:ProfiledCodeHeapSize=
2831 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2832 julong long_ProfiledCodeHeapSize = 0;
2833
2834 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2835 if (errcode != arg_in_range) {
2836 jio_fprintf(defaultStream::error_stream(),
2837 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2838 return JNI_EINVAL;
2839 }
2840 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2841 // -XX:NonProfiledCodeHeapSizee=
2842 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2843 julong long_NonProfiledCodeHeapSize = 0;
2844
2845 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2846 if (errcode != arg_in_range) {
2847 jio_fprintf(defaultStream::error_stream(),
2848 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2849 return JNI_EINVAL;
2850 }
2851 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2852 //-XX:IncreaseFirstTierCompileThresholdAt=
2853 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2854 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2855 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2856 jio_fprintf(defaultStream::error_stream(),
2857 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2858 option->optionString);
2859 return JNI_EINVAL;
2860 }
2861 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2862 // -green
2863 } else if (match_option(option, "-green", &tail)) {
2864 jio_fprintf(defaultStream::error_stream(),
2865 "Green threads support not available\n");
2866 return JNI_EINVAL;
2867 // -native
2868 } else if (match_option(option, "-native", &tail)) {
2869 // HotSpot always uses native threads, ignore silently for compatibility
2870 // -Xsqnopause
2871 } else if (match_option(option, "-Xsqnopause", &tail)) {
2872 // EVM option, ignore silently for compatibility
2873 // -Xrs
2874 } else if (match_option(option, "-Xrs", &tail)) {
2875 // Classic/EVM option, new functionality
2876 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2877 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2878 // change default internal VM signals used - lower case for back compat
2879 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2880 // -Xoptimize
2881 } else if (match_option(option, "-Xoptimize", &tail)) {
2882 // EVM option, ignore silently for compatibility
2883 // -Xprof
2884 } else if (match_option(option, "-Xprof", &tail)) {
2885 #if INCLUDE_FPROF
2886 _has_profile = true;
2887 #else // INCLUDE_FPROF
2888 jio_fprintf(defaultStream::error_stream(),
2889 "Flat profiling is not supported in this VM.\n");
2890 return JNI_ERR;
2891 #endif // INCLUDE_FPROF
2892 // -Xconcurrentio
2893 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2894 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2895 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2896 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2897 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2898 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2899
2900 // -Xinternalversion
2901 } else if (match_option(option, "-Xinternalversion", &tail)) {
2902 jio_fprintf(defaultStream::output_stream(), "%s\n",
2903 VM_Version::internal_vm_info_string());
2904 vm_exit(0);
2905 #ifndef PRODUCT
2906 // -Xprintflags
2907 } else if (match_option(option, "-Xprintflags", &tail)) {
2908 CommandLineFlags::printFlags(tty, false);
2909 vm_exit(0);
2910 #endif
2911 // -D
2912 } else if (match_option(option, "-D", &tail)) {
2913 if (!add_property(tail)) {
2914 return JNI_ENOMEM;
2915 }
2916 // Out of the box management support
2917 if (match_option(option, "-Dcom.sun.management", &tail)) {
2918 #if INCLUDE_MANAGEMENT
2919 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2920 #else
2921 jio_fprintf(defaultStream::output_stream(),
2922 "-Dcom.sun.management is not supported in this VM.\n");
2923 return JNI_ERR;
2924 #endif
2925 }
2926 // -Xint
2927 } else if (match_option(option, "-Xint", &tail)) {
2928 set_mode_flags(_int);
2929 // -Xmixed
2930 } else if (match_option(option, "-Xmixed", &tail)) {
2931 set_mode_flags(_mixed);
2932 // -Xcomp
2933 } else if (match_option(option, "-Xcomp", &tail)) {
2934 // for testing the compiler; turn off all flags that inhibit compilation
2935 set_mode_flags(_comp);
2936 // -Xshare:dump
2937 } else if (match_option(option, "-Xshare:dump", &tail)) {
2938 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2939 set_mode_flags(_int); // Prevent compilation, which creates objects
2940 // -Xshare:on
2941 } else if (match_option(option, "-Xshare:on", &tail)) {
2942 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2943 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2944 // -Xshare:auto
2945 } else if (match_option(option, "-Xshare:auto", &tail)) {
2946 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2947 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2948 // -Xshare:off
2949 } else if (match_option(option, "-Xshare:off", &tail)) {
2950 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2951 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2952 // -Xverify
2953 } else if (match_option(option, "-Xverify", &tail)) {
2954 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2955 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2956 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2957 } else if (strcmp(tail, ":remote") == 0) {
2958 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2959 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2960 } else if (strcmp(tail, ":none") == 0) {
2961 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2962 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2963 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2964 return JNI_EINVAL;
2965 }
2966 // -Xdebug
2967 } else if (match_option(option, "-Xdebug", &tail)) {
2968 // note this flag has been used, then ignore
2969 set_xdebug_mode(true);
2970 // -Xnoagent
2971 } else if (match_option(option, "-Xnoagent", &tail)) {
2972 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2973 } else if (match_option(option, "-Xboundthreads", &tail)) {
2974 // Bind user level threads to kernel threads (Solaris only)
2975 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2976 } else if (match_option(option, "-Xloggc:", &tail)) {
2977 // Redirect GC output to the file. -Xloggc:<filename>
2978 // ostream_init_log(), when called will use this filename
2979 // to initialize a fileStream.
2980 _gc_log_filename = strdup(tail);
2981 if (!is_filename_valid(_gc_log_filename)) {
2982 jio_fprintf(defaultStream::output_stream(),
2983 "Invalid file name for use with -Xloggc: Filename can only contain the "
2984 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2985 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2986 return JNI_EINVAL;
2987 }
2988 FLAG_SET_CMDLINE(bool, PrintGC, true);
2989 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2990
2991 // JNI hooks
2992 } else if (match_option(option, "-Xcheck", &tail)) {
2993 if (!strcmp(tail, ":jni")) {
2994 #if !INCLUDE_JNI_CHECK
2995 warning("JNI CHECKING is not supported in this VM");
2996 #else
2997 CheckJNICalls = true;
2998 #endif // INCLUDE_JNI_CHECK
2999 } else if (is_bad_option(option, args->ignoreUnrecognized,
3000 "check")) {
3001 return JNI_EINVAL;
3002 }
3003 } else if (match_option(option, "vfprintf", &tail)) {
3004 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3005 } else if (match_option(option, "exit", &tail)) {
3006 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3007 } else if (match_option(option, "abort", &tail)) {
3008 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3009 // -XX:+AggressiveHeap
3010 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3011
3012 // This option inspects the machine and attempts to set various
3013 // parameters to be optimal for long-running, memory allocation
3014 // intensive jobs. It is intended for machines with large
3015 // amounts of cpu and memory.
3016
3017 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3018 // VM, but we may not be able to represent the total physical memory
3019 // available (like having 8gb of memory on a box but using a 32bit VM).
3020 // Thus, we need to make sure we're using a julong for intermediate
3021 // calculations.
3022 julong initHeapSize;
3023 julong total_memory = os::physical_memory();
3024
3025 if (total_memory < (julong)256*M) {
3026 jio_fprintf(defaultStream::error_stream(),
3027 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3028 vm_exit(1);
3029 }
3030
3031 // The heap size is half of available memory, or (at most)
3032 // all of possible memory less 160mb (leaving room for the OS
3033 // when using ISM). This is the maximum; because adaptive sizing
3034 // is turned on below, the actual space used may be smaller.
3035
3036 initHeapSize = MIN2(total_memory / (julong)2,
3037 total_memory - (julong)160*M);
3038
3039 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3040
3041 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3042 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3043 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3044 // Currently the minimum size and the initial heap sizes are the same.
3045 set_min_heap_size(initHeapSize);
3046 }
3047 if (FLAG_IS_DEFAULT(NewSize)) {
3048 // Make the young generation 3/8ths of the total heap.
3049 FLAG_SET_CMDLINE(uintx, NewSize,
3050 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3051 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3052 }
3053
3054 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3055 FLAG_SET_DEFAULT(UseLargePages, true);
3056 #endif
3057
3058 // Increase some data structure sizes for efficiency
3059 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3060 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3061 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3062
3063 // See the OldPLABSize comment below, but replace 'after promotion'
3064 // with 'after copying'. YoungPLABSize is the size of the survivor
3065 // space per-gc-thread buffers. The default is 4kw.
3066 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3067
3068 // OldPLABSize is the size of the buffers in the old gen that
3069 // UseParallelGC uses to promote live data that doesn't fit in the
3070 // survivor spaces. At any given time, there's one for each gc thread.
3071 // The default size is 1kw. These buffers are rarely used, since the
3072 // survivor spaces are usually big enough. For specjbb, however, there
3073 // are occasions when there's lots of live data in the young gen
3074 // and we end up promoting some of it. We don't have a definite
3075 // explanation for why bumping OldPLABSize helps, but the theory
3076 // is that a bigger PLAB results in retaining something like the
3077 // original allocation order after promotion, which improves mutator
3078 // locality. A minor effect may be that larger PLABs reduce the
3079 // number of PLAB allocation events during gc. The value of 8kw
3080 // was arrived at by experimenting with specjbb.
3081 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3082
3083 // Enable parallel GC and adaptive generation sizing
3084 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3085 FLAG_SET_DEFAULT(ParallelGCThreads,
3086 Abstract_VM_Version::parallel_worker_threads());
3087
3088 // Encourage steady state memory management
3089 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3090
3091 // This appears to improve mutator locality
3092 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3093
3094 // Get around early Solaris scheduling bug
3095 // (affinity vs other jobs on system)
3096 // but disallow DR and offlining (5008695).
3097 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3098
3099 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3100 // and the last option wins.
3101 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3102 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3103 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3104 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3105 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3106 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3107 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3108 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3109 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3110 uintx max_tenuring_thresh = 0;
3111 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3112 jio_fprintf(defaultStream::error_stream(),
3113 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3114 }
3115 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3116
3117 if (MaxTenuringThreshold == 0) {
3118 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3119 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3120 } else {
3121 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3122 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3123 }
3124 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3125 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3126 jio_fprintf(defaultStream::error_stream(),
3127 "Please use CMSClassUnloadingEnabled in place of "
3128 "CMSPermGenSweepingEnabled in the future\n");
3129 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3130 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3131 jio_fprintf(defaultStream::error_stream(),
3132 "Please use -XX:+UseGCOverheadLimit in place of "
3133 "-XX:+UseGCTimeLimit in the future\n");
3134 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3135 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3136 jio_fprintf(defaultStream::error_stream(),
3137 "Please use -XX:-UseGCOverheadLimit in place of "
3138 "-XX:-UseGCTimeLimit in the future\n");
3139 // The TLE options are for compatibility with 1.3 and will be
3140 // removed without notice in a future release. These options
3141 // are not to be documented.
3142 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3143 // No longer used.
3144 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3145 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3146 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3147 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3148 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3149 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3150 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3151 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3152 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3153 // No longer used.
3154 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3155 julong long_tlab_size = 0;
3156 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3157 if (errcode != arg_in_range) {
3158 jio_fprintf(defaultStream::error_stream(),
3159 "Invalid TLAB size: %s\n", option->optionString);
3160 describe_range_error(errcode);
3161 return JNI_EINVAL;
3162 }
3163 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3164 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3165 // No longer used.
3166 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3167 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3168 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3169 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3170 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3171 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3172 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3173 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3174 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3175 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3176 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3177 #if defined(DTRACE_ENABLED)
3178 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3179 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3180 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3181 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3182 #else // defined(DTRACE_ENABLED)
3183 jio_fprintf(defaultStream::error_stream(),
3184 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3185 return JNI_EINVAL;
3186 #endif // defined(DTRACE_ENABLED)
3187 #ifdef ASSERT
3188 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3189 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3190 // disable scavenge before parallel mark-compact
3191 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3192 #endif
3193 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3194 julong cms_blocks_to_claim = (julong)atol(tail);
3195 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3196 jio_fprintf(defaultStream::error_stream(),
3197 "Please use -XX:OldPLABSize in place of "
3198 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3199 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3200 julong cms_blocks_to_claim = (julong)atol(tail);
3201 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3202 jio_fprintf(defaultStream::error_stream(),
3203 "Please use -XX:OldPLABSize in place of "
3204 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3205 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3206 julong old_plab_size = 0;
3207 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3208 if (errcode != arg_in_range) {
3209 jio_fprintf(defaultStream::error_stream(),
3210 "Invalid old PLAB size: %s\n", option->optionString);
3211 describe_range_error(errcode);
3212 return JNI_EINVAL;
3213 }
3214 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3215 jio_fprintf(defaultStream::error_stream(),
3216 "Please use -XX:OldPLABSize in place of "
3217 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3218 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3219 julong young_plab_size = 0;
3220 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3221 if (errcode != arg_in_range) {
3222 jio_fprintf(defaultStream::error_stream(),
3223 "Invalid young PLAB size: %s\n", option->optionString);
3224 describe_range_error(errcode);
3225 return JNI_EINVAL;
3226 }
3227 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3228 jio_fprintf(defaultStream::error_stream(),
3229 "Please use -XX:YoungPLABSize in place of "
3230 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3231 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3232 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3233 julong stack_size = 0;
3234 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3235 if (errcode != arg_in_range) {
3236 jio_fprintf(defaultStream::error_stream(),
3237 "Invalid mark stack size: %s\n", option->optionString);
3238 describe_range_error(errcode);
3239 return JNI_EINVAL;
3240 }
3241 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3242 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3243 julong max_stack_size = 0;
3244 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3245 if (errcode != arg_in_range) {
3246 jio_fprintf(defaultStream::error_stream(),
3247 "Invalid maximum mark stack size: %s\n",
3248 option->optionString);
3249 describe_range_error(errcode);
3250 return JNI_EINVAL;
3251 }
3252 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3253 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3254 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3255 uintx conc_threads = 0;
3256 if (!parse_uintx(tail, &conc_threads, 1)) {
3257 jio_fprintf(defaultStream::error_stream(),
3258 "Invalid concurrent threads: %s\n", option->optionString);
3259 return JNI_EINVAL;
3260 }
3261 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3262 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3263 julong max_direct_memory_size = 0;
3264 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3265 if (errcode != arg_in_range) {
3266 jio_fprintf(defaultStream::error_stream(),
3267 "Invalid maximum direct memory size: %s\n",
3268 option->optionString);
3269 describe_range_error(errcode);
3270 return JNI_EINVAL;
3271 }
3272 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3273 #if !INCLUDE_MANAGEMENT
3274 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3275 jio_fprintf(defaultStream::error_stream(),
3276 "ManagementServer is not supported in this VM.\n");
3277 return JNI_ERR;
3278 #endif // INCLUDE_MANAGEMENT
3279 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3280 // Skip -XX:Flags= since that case has already been handled
3281 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3282 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3283 return JNI_EINVAL;
3284 }
3285 }
3286 // Unknown option
3287 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3288 return JNI_ERR;
3289 }
3290 }
3291
3292 // Change the default value for flags which have different default values
3293 // when working with older JDKs.
3294 #ifdef LINUX
3295 if (JDK_Version::current().compare_major(6) <= 0 &&
3296 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3297 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3298 }
3299 #endif // LINUX
3300 return JNI_OK;
3301 }
3302
3303 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3304 // This must be done after all -D arguments have been processed.
3305 scp_p->expand_endorsed();
3306
3307 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3308 // Assemble the bootclasspath elements into the final path.
3309 Arguments::set_sysclasspath(scp_p->combined_path());
3310 }
3311
3312 // This must be done after all arguments have been processed.
3313 // java_compiler() true means set to "NONE" or empty.
3314 if (java_compiler() && !xdebug_mode()) {
3315 // For backwards compatibility, we switch to interpreted mode if
3316 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3317 // not specified.
3318 set_mode_flags(_int);
3319 }
3320 if (CompileThreshold == 0) {
3321 set_mode_flags(_int);
3322 }
3323
3324 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3325 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3326 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3327 }
3328
3329 #ifndef COMPILER2
3330 // Don't degrade server performance for footprint
3331 if (FLAG_IS_DEFAULT(UseLargePages) &&
3332 MaxHeapSize < LargePageHeapSizeThreshold) {
3333 // No need for large granularity pages w/small heaps.
3334 // Note that large pages are enabled/disabled for both the
3335 // Java heap and the code cache.
3336 FLAG_SET_DEFAULT(UseLargePages, false);
3337 }
3338
3339 #else
3340 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3341 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3342 }
3343 #endif
3344
3345 #ifndef TIERED
3346 // Tiered compilation is undefined.
3347 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3348 #endif
3349
3350 // If we are running in a headless jre, force java.awt.headless property
3351 // to be true unless the property has already been set.
3352 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3353 if (os::is_headless_jre()) {
3354 const char* headless = Arguments::get_property("java.awt.headless");
3355 if (headless == NULL) {
3356 char envbuffer[128];
3357 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3358 if (!add_property("java.awt.headless=true")) {
3359 return JNI_ENOMEM;
3360 }
3361 } else {
3362 char buffer[256];
3363 strcpy(buffer, "java.awt.headless=");
3364 strcat(buffer, envbuffer);
3365 if (!add_property(buffer)) {
3366 return JNI_ENOMEM;
3367 }
3368 }
3369 }
3370 }
3371
3372 if (!check_vm_args_consistency()) {
3373 return JNI_ERR;
3374 }
3375
3376 return JNI_OK;
3377 }
3378
3379 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3380 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3381 scp_assembly_required_p);
3382 }
3383
3384 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3385 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3386 scp_assembly_required_p);
3387 }
3388
3389 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3390 const int N_MAX_OPTIONS = 64;
3391 const int OPTION_BUFFER_SIZE = 1024;
3392 char buffer[OPTION_BUFFER_SIZE];
3393
3394 // The variable will be ignored if it exceeds the length of the buffer.
3395 // Don't check this variable if user has special privileges
3396 // (e.g. unix su command).
3397 if (os::getenv(name, buffer, sizeof(buffer)) &&
3398 !os::have_special_privileges()) {
3399 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3400 jio_fprintf(defaultStream::error_stream(),
3401 "Picked up %s: %s\n", name, buffer);
3402 char* rd = buffer; // pointer to the input string (rd)
3403 int i;
3404 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3405 while (isspace(*rd)) rd++; // skip whitespace
3406 if (*rd == 0) break; // we re done when the input string is read completely
3407
3408 // The output, option string, overwrites the input string.
3409 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3410 // input string (rd).
3411 char* wrt = rd;
3412
3413 options[i++].optionString = wrt; // Fill in option
3414 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3415 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3416 int quote = *rd; // matching quote to look for
3417 rd++; // don't copy open quote
3418 while (*rd != quote) { // include everything (even spaces) up until quote
3419 if (*rd == 0) { // string termination means unmatched string
3420 jio_fprintf(defaultStream::error_stream(),
3421 "Unmatched quote in %s\n", name);
3422 return JNI_ERR;
3423 }
3424 *wrt++ = *rd++; // copy to option string
3425 }
3426 rd++; // don't copy close quote
3427 } else {
3428 *wrt++ = *rd++; // copy to option string
3429 }
3430 }
3431 // Need to check if we're done before writing a NULL,
3432 // because the write could be to the byte that rd is pointing to.
3433 if (*rd++ == 0) {
3434 *wrt = 0;
3435 break;
3436 }
3437 *wrt = 0; // Zero terminate option
3438 }
3439 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3440 JavaVMInitArgs vm_args;
3441 vm_args.version = JNI_VERSION_1_2;
3442 vm_args.options = options;
3443 vm_args.nOptions = i;
3444 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3445
3446 if (PrintVMOptions) {
3447 const char* tail;
3448 for (int i = 0; i < vm_args.nOptions; i++) {
3449 const JavaVMOption *option = vm_args.options + i;
3450 if (match_option(option, "-XX:", &tail)) {
3451 logOption(tail);
3452 }
3453 }
3454 }
3455
3456 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3457 }
3458 return JNI_OK;
3459 }
3460
3461 void Arguments::set_shared_spaces_flags() {
3462 if (DumpSharedSpaces) {
3463 if (RequireSharedSpaces) {
3464 warning("cannot dump shared archive while using shared archive");
3465 }
3466 UseSharedSpaces = false;
3467 #ifdef _LP64
3468 if (!UseCompressedOops || !UseCompressedClassPointers) {
3469 vm_exit_during_initialization(
3470 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3471 }
3472 } else {
3473 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3474 if (!UseCompressedOops || !UseCompressedClassPointers) {
3475 no_shared_spaces();
3476 }
3477 #endif
3478 }
3479 }
3480
3481 #if !INCLUDE_ALL_GCS
3482 static void force_serial_gc() {
3483 FLAG_SET_DEFAULT(UseSerialGC, true);
3484 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3485 UNSUPPORTED_GC_OPTION(UseG1GC);
3486 UNSUPPORTED_GC_OPTION(UseParallelGC);
3487 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3488 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3489 UNSUPPORTED_GC_OPTION(UseParNewGC);
3490 }
3491 #endif // INCLUDE_ALL_GCS
3492
3493 // Sharing support
3494 // Construct the path to the archive
3495 static char* get_shared_archive_path() {
3496 char *shared_archive_path;
3497 if (SharedArchiveFile == NULL) {
3498 char jvm_path[JVM_MAXPATHLEN];
3499 os::jvm_path(jvm_path, sizeof(jvm_path));
3500 char *end = strrchr(jvm_path, *os::file_separator());
3501 if (end != NULL) *end = '\0';
3502 size_t jvm_path_len = strlen(jvm_path);
3503 size_t file_sep_len = strlen(os::file_separator());
3504 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3505 file_sep_len + 20, mtInternal);
3506 if (shared_archive_path != NULL) {
3507 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3508 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3509 strncat(shared_archive_path, "classes.jsa", 11);
3510 }
3511 } else {
3512 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3513 if (shared_archive_path != NULL) {
3514 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3515 }
3516 }
3517 return shared_archive_path;
3518 }
3519
3520 #ifndef PRODUCT
3521 // Determine whether LogVMOutput should be implicitly turned on.
3522 static bool use_vm_log() {
3523 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3524 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3525 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3526 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3527 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3528 return true;
3529 }
3530
3531 #ifdef COMPILER1
3532 if (PrintC1Statistics) {
3533 return true;
3534 }
3535 #endif // COMPILER1
3536
3537 #ifdef COMPILER2
3538 if (PrintOptoAssembly || PrintOptoStatistics) {
3539 return true;
3540 }
3541 #endif // COMPILER2
3542
3543 return false;
3544 }
3545 #endif // PRODUCT
3546
3547 // Parse entry point called from JNI_CreateJavaVM
3548
3549 jint Arguments::parse(const JavaVMInitArgs* args) {
3550
3551 // Remaining part of option string
3552 const char* tail;
3553
3554 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3555 const char* hotspotrc = ".hotspotrc";
3556 bool settings_file_specified = false;
3557 bool needs_hotspotrc_warning = false;
3558
3559 const char* flags_file;
3560 int index;
3561 for (index = 0; index < args->nOptions; index++) {
3562 const JavaVMOption *option = args->options + index;
3563 if (match_option(option, "-XX:Flags=", &tail)) {
3564 flags_file = tail;
3565 settings_file_specified = true;
3566 }
3567 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3568 PrintVMOptions = true;
3569 }
3570 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3571 PrintVMOptions = false;
3572 }
3573 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3574 IgnoreUnrecognizedVMOptions = true;
3575 }
3576 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3577 IgnoreUnrecognizedVMOptions = false;
3578 }
3579 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3580 CommandLineFlags::printFlags(tty, false);
3581 vm_exit(0);
3582 }
3583 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3584 #if INCLUDE_NMT
3585 MemTracker::init_tracking_options(tail);
3586 #else
3587 jio_fprintf(defaultStream::error_stream(),
3588 "Native Memory Tracking is not supported in this VM\n");
3589 return JNI_ERR;
3590 #endif
3591 }
3592
3593
3594 #ifndef PRODUCT
3595 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3596 CommandLineFlags::printFlags(tty, true);
3597 vm_exit(0);
3598 }
3599 #endif
3600 }
3601
3602 if (IgnoreUnrecognizedVMOptions) {
3603 // uncast const to modify the flag args->ignoreUnrecognized
3604 *(jboolean*)(&args->ignoreUnrecognized) = true;
3605 }
3606
3607 // Parse specified settings file
3608 if (settings_file_specified) {
3609 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3610 return JNI_EINVAL;
3611 }
3612 } else {
3613 #ifdef ASSERT
3614 // Parse default .hotspotrc settings file
3615 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3616 return JNI_EINVAL;
3617 }
3618 #else
3619 struct stat buf;
3620 if (os::stat(hotspotrc, &buf) == 0) {
3621 needs_hotspotrc_warning = true;
3622 }
3623 #endif
3624 }
3625
3626 if (PrintVMOptions) {
3627 for (index = 0; index < args->nOptions; index++) {
3628 const JavaVMOption *option = args->options + index;
3629 if (match_option(option, "-XX:", &tail)) {
3630 logOption(tail);
3631 }
3632 }
3633 }
3634
3635 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3636 jint result = parse_vm_init_args(args);
3637 if (result != JNI_OK) {
3638 return result;
3639 }
3640
3641 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3642 SharedArchivePath = get_shared_archive_path();
3643 if (SharedArchivePath == NULL) {
3644 return JNI_ENOMEM;
3645 }
3646
3647 // Delay warning until here so that we've had a chance to process
3648 // the -XX:-PrintWarnings flag
3649 if (needs_hotspotrc_warning) {
3650 warning("%s file is present but has been ignored. "
3651 "Run with -XX:Flags=%s to load the file.",
3652 hotspotrc, hotspotrc);
3653 }
3654
3655 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3656 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3657 #endif
3658
3659 #if INCLUDE_ALL_GCS
3660 #if (defined JAVASE_EMBEDDED || defined ARM)
3661 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3662 #endif
3663 #endif
3664
3665 #ifndef PRODUCT
3666 if (TraceBytecodesAt != 0) {
3667 TraceBytecodes = true;
3668 }
3669 if (CountCompiledCalls) {
3670 if (UseCounterDecay) {
3671 warning("UseCounterDecay disabled because CountCalls is set");
3672 UseCounterDecay = false;
3673 }
3674 }
3675 #endif // PRODUCT
3676
3677 // JSR 292 is not supported before 1.7
3678 if (!JDK_Version::is_gte_jdk17x_version()) {
3679 if (EnableInvokeDynamic) {
3680 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3681 warning("JSR 292 is not supported before 1.7. Disabling support.");
3682 }
3683 EnableInvokeDynamic = false;
3684 }
3685 }
3686
3687 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3688 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3689 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3690 }
3691 ScavengeRootsInCode = 1;
3692 }
3693
3694 if (PrintGCDetails) {
3695 // Turn on -verbose:gc options as well
3696 PrintGC = true;
3697 }
3698
3699 if (!JDK_Version::is_gte_jdk18x_version()) {
3700 // To avoid changing the log format for 7 updates this flag is only
3701 // true by default in JDK8 and above.
3702 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3703 FLAG_SET_DEFAULT(PrintGCCause, false);
3704 }
3705 }
3706
3707 // Set object alignment values.
3708 set_object_alignment();
3709
3710 #if !INCLUDE_ALL_GCS
3711 force_serial_gc();
3712 #endif // INCLUDE_ALL_GCS
3713 #if !INCLUDE_CDS
3714 if (DumpSharedSpaces || RequireSharedSpaces) {
3715 jio_fprintf(defaultStream::error_stream(),
3716 "Shared spaces are not supported in this VM\n");
3717 return JNI_ERR;
3718 }
3719 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3720 warning("Shared spaces are not supported in this VM");
3721 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3722 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3723 }
3724 no_shared_spaces();
3725 #endif // INCLUDE_CDS
3726
3727 return JNI_OK;
3728 }
3729
3730 jint Arguments::apply_ergo() {
3731
3732 // Set flags based on ergonomics.
3733 set_ergonomics_flags();
3734
3735 set_shared_spaces_flags();
3736
3737 // Check the GC selections again.
3738 if (!check_gc_consistency()) {
3739 return JNI_EINVAL;
3740 }
3741
3742 if (TieredCompilation) {
3743 set_tiered_flags();
3744 } else {
3745 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3746 if (CompilationPolicyChoice >= 2) {
3747 vm_exit_during_initialization(
3748 "Incompatible compilation policy selected", NULL);
3749 }
3750 }
3751 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3752 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3753 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3754 }
3755
3756
3757 // Set heap size based on available physical memory
3758 set_heap_size();
3759
3760 #if INCLUDE_ALL_GCS
3761 // Set per-collector flags
3762 if (UseParallelGC || UseParallelOldGC) {
3763 set_parallel_gc_flags();
3764 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
3765 set_cms_and_parnew_gc_flags();
3766 } else if (UseParNewGC) { // Skipped if CMS is set above
3767 set_parnew_gc_flags();
3768 } else if (UseG1GC) {
3769 set_g1_gc_flags();
3770 }
3771 check_deprecated_gcs();
3772 check_deprecated_gc_flags();
3773 if (AssumeMP && !UseSerialGC) {
3774 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3775 warning("If the number of processors is expected to increase from one, then"
3776 " you should configure the number of parallel GC threads appropriately"
3777 " using -XX:ParallelGCThreads=N");
3778 }
3779 }
3780 if (MinHeapFreeRatio == 100) {
3781 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
3782 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
3783 }
3784 #else // INCLUDE_ALL_GCS
3785 assert(verify_serial_gc_flags(), "SerialGC unset");
3786 #endif // INCLUDE_ALL_GCS
3787
3788 // Initialize Metaspace flags and alignments
3789 Metaspace::ergo_initialize();
3790
3791 // Set bytecode rewriting flags
3792 set_bytecode_flags();
3793
3794 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3795 set_aggressive_opts_flags();
3796
3797 // Turn off biased locking for locking debug mode flags,
3798 // which are subtly different from each other but neither works with
3799 // biased locking
3800 if (UseHeavyMonitors
3801 #ifdef COMPILER1
3802 || !UseFastLocking
3803 #endif // COMPILER1
3804 ) {
3805 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3806 // flag set to true on command line; warn the user that they
3807 // can't enable biased locking here
3808 warning("Biased Locking is not supported with locking debug flags"
3809 "; ignoring UseBiasedLocking flag." );
3810 }
3811 UseBiasedLocking = false;
3812 }
3813
3814 #ifdef ZERO
3815 // Clear flags not supported on zero.
3816 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3817 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3818 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3819 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3820 #endif // CC_INTERP
3821
3822 #ifdef COMPILER2
3823 if (!EliminateLocks) {
3824 EliminateNestedLocks = false;
3825 }
3826 if (!Inline) {
3827 IncrementalInline = false;
3828 }
3829 #ifndef PRODUCT
3830 if (!IncrementalInline) {
3831 AlwaysIncrementalInline = false;
3832 }
3833 #endif
3834 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3835 // nothing to use the profiling, turn if off
3836 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3837 }
3838 if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) {
3839 // Doing the replace in parent maps helps speculation
3840 FLAG_SET_DEFAULT(ReplaceInParentMaps, true);
3841 }
3842 #endif
3843
3844 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3845 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3846 DebugNonSafepoints = true;
3847 }
3848
3849 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3850 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3851 }
3852
3853 #ifndef PRODUCT
3854 if (CompileTheWorld) {
3855 // Force NmethodSweeper to sweep whole CodeCache each time.
3856 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3857 NmethodSweepFraction = 1;
3858 }
3859 }
3860
3861 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3862 if (use_vm_log()) {
3863 LogVMOutput = true;
3864 }
3865 }
3866 #endif // PRODUCT
3867
3868 if (PrintCommandLineFlags) {
3869 CommandLineFlags::printSetFlags(tty);
3870 }
3871
3872 // Apply CPU specific policy for the BiasedLocking
3873 if (UseBiasedLocking) {
3874 if (!VM_Version::use_biased_locking() &&
3875 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3876 UseBiasedLocking = false;
3877 }
3878 }
3879 #ifdef COMPILER2
3880 if (!UseBiasedLocking || EmitSync != 0) {
3881 UseOptoBiasInlining = false;
3882 }
3883 #endif
3884
3885 return JNI_OK;
3886 }
3887
3888 jint Arguments::adjust_after_os() {
3889 if (UseNUMA) {
3890 if (UseParallelGC || UseParallelOldGC) {
3891 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3892 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3893 }
3894 }
3895 // UseNUMAInterleaving is set to ON for all collectors and
3896 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3897 // such as the parallel collector for Linux and Solaris will
3898 // interleave old gen and survivor spaces on top of NUMA
3899 // allocation policy for the eden space.
3900 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3901 // all platforms and ParallelGC on Windows will interleave all
3902 // of the heap spaces across NUMA nodes.
3903 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3904 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3905 }
3906 }
3907 return JNI_OK;
3908 }
3909
3910 int Arguments::PropertyList_count(SystemProperty* pl) {
3911 int count = 0;
3912 while(pl != NULL) {
3913 count++;
3914 pl = pl->next();
3915 }
3916 return count;
3917 }
3918
3919 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3920 assert(key != NULL, "just checking");
3921 SystemProperty* prop;
3922 for (prop = pl; prop != NULL; prop = prop->next()) {
3923 if (strcmp(key, prop->key()) == 0) return prop->value();
3924 }
3925 return NULL;
3926 }
3927
3928 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3929 int count = 0;
3930 const char* ret_val = NULL;
3931
3932 while(pl != NULL) {
3933 if(count >= index) {
3934 ret_val = pl->key();
3935 break;
3936 }
3937 count++;
3938 pl = pl->next();
3939 }
3940
3941 return ret_val;
3942 }
3943
3944 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3945 int count = 0;
3946 char* ret_val = NULL;
3947
3948 while(pl != NULL) {
3949 if(count >= index) {
3950 ret_val = pl->value();
3951 break;
3952 }
3953 count++;
3954 pl = pl->next();
3955 }
3956
3957 return ret_val;
3958 }
3959
3960 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3961 SystemProperty* p = *plist;
3962 if (p == NULL) {
3963 *plist = new_p;
3964 } else {
3965 while (p->next() != NULL) {
3966 p = p->next();
3967 }
3968 p->set_next(new_p);
3969 }
3970 }
3971
3972 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3973 if (plist == NULL)
3974 return;
3975
3976 SystemProperty* new_p = new SystemProperty(k, v, true);
3977 PropertyList_add(plist, new_p);
3978 }
3979
3980 // This add maintains unique property key in the list.
3981 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3982 if (plist == NULL)
3983 return;
3984
3985 // If property key exist then update with new value.
3986 SystemProperty* prop;
3987 for (prop = *plist; prop != NULL; prop = prop->next()) {
3988 if (strcmp(k, prop->key()) == 0) {
3989 if (append) {
3990 prop->append_value(v);
3991 } else {
3992 prop->set_value(v);
3993 }
3994 return;
3995 }
3996 }
3997
3998 PropertyList_add(plist, k, v);
3999 }
4000
4001 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4002 // Returns true if all of the source pointed by src has been copied over to
4003 // the destination buffer pointed by buf. Otherwise, returns false.
4004 // Notes:
4005 // 1. If the length (buflen) of the destination buffer excluding the
4006 // NULL terminator character is not long enough for holding the expanded
4007 // pid characters, it also returns false instead of returning the partially
4008 // expanded one.
4009 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4010 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4011 char* buf, size_t buflen) {
4012 const char* p = src;
4013 char* b = buf;
4014 const char* src_end = &src[srclen];
4015 char* buf_end = &buf[buflen - 1];
4016
4017 while (p < src_end && b < buf_end) {
4018 if (*p == '%') {
4019 switch (*(++p)) {
4020 case '%': // "%%" ==> "%"
4021 *b++ = *p++;
4022 break;
4023 case 'p': { // "%p" ==> current process id
4024 // buf_end points to the character before the last character so
4025 // that we could write '\0' to the end of the buffer.
4026 size_t buf_sz = buf_end - b + 1;
4027 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4028
4029 // if jio_snprintf fails or the buffer is not long enough to hold
4030 // the expanded pid, returns false.
4031 if (ret < 0 || ret >= (int)buf_sz) {
4032 return false;
4033 } else {
4034 b += ret;
4035 assert(*b == '\0', "fail in copy_expand_pid");
4036 if (p == src_end && b == buf_end + 1) {
4037 // reach the end of the buffer.
4038 return true;
4039 }
4040 }
4041 p++;
4042 break;
4043 }
4044 default :
4045 *b++ = '%';
4046 }
4047 } else {
4048 *b++ = *p++;
4049 }
4050 }
4051 *b = '\0';
4052 return (p == src_end); // return false if not all of the source was copied
4053 }