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312 // Returns true if the flag is obsolete and fits into the range specified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