1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "compiler/compilerOracle.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/cardTableRS.hpp"
31 #include "memory/genCollectedHeap.hpp"
32 #include "memory/referenceProcessor.hpp"
33 #include "memory/universe.inline.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "prims/jvmtiExport.hpp"
36 #include "runtime/arguments.hpp"
37 #include "runtime/globals_extension.hpp"
38 #include "runtime/java.hpp"
39 #include "services/management.hpp"
40 #include "services/memTracker.hpp"
41 #include "utilities/defaultStream.hpp"
42 #include "utilities/macros.hpp"
43 #include "utilities/taskqueue.hpp"
44 #ifdef TARGET_OS_FAMILY_linux
45 # include "os_linux.inline.hpp"
46 #endif
47 #ifdef TARGET_OS_FAMILY_solaris
48 # include "os_solaris.inline.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_windows
51 # include "os_windows.inline.hpp"
52 #endif
53 #ifdef TARGET_OS_FAMILY_aix
54 # include "os_aix.inline.hpp"
55 #endif
56 #ifdef TARGET_OS_FAMILY_bsd
57 # include "os_bsd.inline.hpp"
58 #endif
59 #if INCLUDE_ALL_GCS
60 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
61 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
62 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
63 #endif // INCLUDE_ALL_GCS
64
65 // Note: This is a special bug reporting site for the JVM
66 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
67 #define DEFAULT_JAVA_LAUNCHER "generic"
68
69 // Disable options not supported in this release, with a warning if they
70 // were explicitly requested on the command-line
71 #define UNSUPPORTED_OPTION(opt, description) \
72 do { \
73 if (opt) { \
74 if (FLAG_IS_CMDLINE(opt)) { \
75 warning(description " is disabled in this release."); \
76 } \
77 FLAG_SET_DEFAULT(opt, false); \
78 } \
79 } while(0)
80
81 #define UNSUPPORTED_GC_OPTION(gc) \
82 do { \
83 if (gc) { \
84 if (FLAG_IS_CMDLINE(gc)) { \
85 warning(#gc " is not supported in this VM. Using Serial GC."); \
86 } \
87 FLAG_SET_DEFAULT(gc, false); \
88 } \
89 } while(0)
90
91 char** Arguments::_jvm_flags_array = NULL;
92 int Arguments::_num_jvm_flags = 0;
93 char** Arguments::_jvm_args_array = NULL;
94 int Arguments::_num_jvm_args = 0;
95 char* Arguments::_java_command = NULL;
96 SystemProperty* Arguments::_system_properties = NULL;
97 const char* Arguments::_gc_log_filename = NULL;
98 bool Arguments::_has_profile = false;
99 size_t Arguments::_conservative_max_heap_alignment = 0;
100 uintx Arguments::_min_heap_size = 0;
101 Arguments::Mode Arguments::_mode = _mixed;
102 bool Arguments::_java_compiler = false;
103 bool Arguments::_xdebug_mode = false;
104 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
105 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
106 int Arguments::_sun_java_launcher_pid = -1;
107 bool Arguments::_sun_java_launcher_is_altjvm = false;
108
109 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
110 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
111 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
112 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
113 bool Arguments::_ClipInlining = ClipInlining;
114
115 char* Arguments::SharedArchivePath = NULL;
116
117 AgentLibraryList Arguments::_libraryList;
118 AgentLibraryList Arguments::_agentList;
119
120 abort_hook_t Arguments::_abort_hook = NULL;
121 exit_hook_t Arguments::_exit_hook = NULL;
122 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
123
124
125 SystemProperty *Arguments::_java_ext_dirs = NULL;
126 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
127 SystemProperty *Arguments::_sun_boot_library_path = NULL;
128 SystemProperty *Arguments::_java_library_path = NULL;
129 SystemProperty *Arguments::_java_home = NULL;
130 SystemProperty *Arguments::_java_class_path = NULL;
131 SystemProperty *Arguments::_sun_boot_class_path = NULL;
132
133 char* Arguments::_meta_index_path = NULL;
134 char* Arguments::_meta_index_dir = NULL;
135
136 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
137
138 static bool match_option(const JavaVMOption *option, const char* name,
139 const char** tail) {
140 int len = (int)strlen(name);
141 if (strncmp(option->optionString, name, len) == 0) {
142 *tail = option->optionString + len;
143 return true;
144 } else {
145 return false;
146 }
147 }
148
149 static void logOption(const char* opt) {
150 if (PrintVMOptions) {
151 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
152 }
153 }
154
155 // Process java launcher properties.
156 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
157 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
158 // sun.java.launcher.pid is defined.
159 // Must do this before setting up other system properties,
160 // as some of them may depend on launcher type.
161 for (int index = 0; index < args->nOptions; index++) {
162 const JavaVMOption* option = args->options + index;
163 const char* tail;
164
165 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
166 process_java_launcher_argument(tail, option->extraInfo);
167 continue;
168 }
169 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
170 if (strcmp(tail, "true") == 0) {
171 _sun_java_launcher_is_altjvm = true;
172 }
173 continue;
174 }
175 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
176 _sun_java_launcher_pid = atoi(tail);
177 continue;
178 }
179 }
180 }
181
182 // Initialize system properties key and value.
183 void Arguments::init_system_properties() {
184
185 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
186 "Java Virtual Machine Specification", false));
187 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
188 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
190
191 // Following are JVMTI agent writable properties.
192 // Properties values are set to NULL and they are
193 // os specific they are initialized in os::init_system_properties_values().
194 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
195 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
196 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
197 _java_library_path = new SystemProperty("java.library.path", NULL, true);
198 _java_home = new SystemProperty("java.home", NULL, true);
199 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
200
201 _java_class_path = new SystemProperty("java.class.path", "", true);
202
203 // Add to System Property list.
204 PropertyList_add(&_system_properties, _java_ext_dirs);
205 PropertyList_add(&_system_properties, _java_endorsed_dirs);
206 PropertyList_add(&_system_properties, _sun_boot_library_path);
207 PropertyList_add(&_system_properties, _java_library_path);
208 PropertyList_add(&_system_properties, _java_home);
209 PropertyList_add(&_system_properties, _java_class_path);
210 PropertyList_add(&_system_properties, _sun_boot_class_path);
211
212 // Set OS specific system properties values
213 os::init_system_properties_values();
214 }
215
216
217 // Update/Initialize System properties after JDK version number is known
218 void Arguments::init_version_specific_system_properties() {
219 enum { bufsz = 16 };
220 char buffer[bufsz];
221 const char* spec_vendor = "Sun Microsystems Inc.";
222 uint32_t spec_version = 0;
223
224 if (JDK_Version::is_gte_jdk17x_version()) {
225 spec_vendor = "Oracle Corporation";
226 spec_version = JDK_Version::current().major_version();
227 }
228 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
229
230 PropertyList_add(&_system_properties,
231 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.specification.version", buffer, false));
234 PropertyList_add(&_system_properties,
235 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
236 }
237
238 /**
239 * Provide a slightly more user-friendly way of eliminating -XX flags.
240 * When a flag is eliminated, it can be added to this list in order to
241 * continue accepting this flag on the command-line, while issuing a warning
242 * and ignoring the value. Once the JDK version reaches the 'accept_until'
243 * limit, we flatly refuse to admit the existence of the flag. This allows
244 * a flag to die correctly over JDK releases using HSX.
245 */
246 typedef struct {
247 const char* name;
248 JDK_Version obsoleted_in; // when the flag went away
249 JDK_Version accept_until; // which version to start denying the existence
250 } ObsoleteFlag;
251
252 static ObsoleteFlag obsolete_jvm_flags[] = {
253 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
258 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
259 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
260 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
261 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
262 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
263 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
264 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
265 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
266 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
267 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
268 { "DefaultInitialRAMFraction",
269 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
270 { "UseDepthFirstScavengeOrder",
271 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
272 { "HandlePromotionFailure",
273 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
274 { "MaxLiveObjectEvacuationRatio",
275 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
276 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
277 { "UseParallelOldGCCompacting",
278 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
279 { "UseParallelDensePrefixUpdate",
280 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
281 { "UseParallelOldGCDensePrefix",
282 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
283 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
284 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
285 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
295 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
296 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
297 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
298 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
299 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
300 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
302 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
303 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
304 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
305 #ifdef PRODUCT
306 { "DesiredMethodLimit",
307 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
308 #endif // PRODUCT
309 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) },
310 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
311 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
312 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
313 { NULL, JDK_Version(0), JDK_Version(0) }
314 };
315
316 // Returns true if the flag is obsolete and fits into the range specified
317 // for being ignored. In the case that the flag is ignored, the 'version'
318 // value is filled in with the version number when the flag became
319 // obsolete so that that value can be displayed to the user.
320 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
321 int i = 0;
322 assert(version != NULL, "Must provide a version buffer");
323 while (obsolete_jvm_flags[i].name != NULL) {
324 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
325 // <flag>=xxx form
326 // [-|+]<flag> form
327 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
328 ((s[0] == '+' || s[0] == '-') &&
329 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
330 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
331 *version = flag_status.obsoleted_in;
332 return true;
333 }
334 }
335 i++;
336 }
337 return false;
338 }
339
340 // Constructs the system class path (aka boot class path) from the following
341 // components, in order:
342 //
343 // prefix // from -Xbootclasspath/p:...
344 // endorsed // the expansion of -Djava.endorsed.dirs=...
345 // base // from os::get_system_properties() or -Xbootclasspath=
346 // suffix // from -Xbootclasspath/a:...
347 //
348 // java.endorsed.dirs is a list of directories; any jar or zip files in the
349 // directories are added to the sysclasspath just before the base.
350 //
351 // This could be AllStatic, but it isn't needed after argument processing is
352 // complete.
353 class SysClassPath: public StackObj {
354 public:
355 SysClassPath(const char* base);
356 ~SysClassPath();
357
358 inline void set_base(const char* base);
359 inline void add_prefix(const char* prefix);
360 inline void add_suffix_to_prefix(const char* suffix);
361 inline void add_suffix(const char* suffix);
362 inline void reset_path(const char* base);
363
364 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
365 // property. Must be called after all command-line arguments have been
366 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
367 // combined_path().
368 void expand_endorsed();
369
370 inline const char* get_base() const { return _items[_scp_base]; }
371 inline const char* get_prefix() const { return _items[_scp_prefix]; }
372 inline const char* get_suffix() const { return _items[_scp_suffix]; }
373 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
374
375 // Combine all the components into a single c-heap-allocated string; caller
376 // must free the string if/when no longer needed.
377 char* combined_path();
378
379 private:
380 // Utility routines.
381 static char* add_to_path(const char* path, const char* str, bool prepend);
382 static char* add_jars_to_path(char* path, const char* directory);
383
384 inline void reset_item_at(int index);
385
386 // Array indices for the items that make up the sysclasspath. All except the
387 // base are allocated in the C heap and freed by this class.
388 enum {
389 _scp_prefix, // from -Xbootclasspath/p:...
390 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
391 _scp_base, // the default sysclasspath
392 _scp_suffix, // from -Xbootclasspath/a:...
393 _scp_nitems // the number of items, must be last.
394 };
395
396 const char* _items[_scp_nitems];
397 DEBUG_ONLY(bool _expansion_done;)
398 };
399
400 SysClassPath::SysClassPath(const char* base) {
401 memset(_items, 0, sizeof(_items));
402 _items[_scp_base] = base;
403 DEBUG_ONLY(_expansion_done = false;)
404 }
405
406 SysClassPath::~SysClassPath() {
407 // Free everything except the base.
408 for (int i = 0; i < _scp_nitems; ++i) {
409 if (i != _scp_base) reset_item_at(i);
410 }
411 DEBUG_ONLY(_expansion_done = false;)
412 }
413
414 inline void SysClassPath::set_base(const char* base) {
415 _items[_scp_base] = base;
416 }
417
418 inline void SysClassPath::add_prefix(const char* prefix) {
419 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
420 }
421
422 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
423 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
424 }
425
426 inline void SysClassPath::add_suffix(const char* suffix) {
427 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
428 }
429
430 inline void SysClassPath::reset_item_at(int index) {
431 assert(index < _scp_nitems && index != _scp_base, "just checking");
432 if (_items[index] != NULL) {
433 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
434 _items[index] = NULL;
435 }
436 }
437
438 inline void SysClassPath::reset_path(const char* base) {
439 // Clear the prefix and suffix.
440 reset_item_at(_scp_prefix);
441 reset_item_at(_scp_suffix);
442 set_base(base);
443 }
444
445 //------------------------------------------------------------------------------
446
447 void SysClassPath::expand_endorsed() {
448 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
449
450 const char* path = Arguments::get_property("java.endorsed.dirs");
451 if (path == NULL) {
452 path = Arguments::get_endorsed_dir();
453 assert(path != NULL, "no default for java.endorsed.dirs");
454 }
455
456 char* expanded_path = NULL;
457 const char separator = *os::path_separator();
458 const char* const end = path + strlen(path);
459 while (path < end) {
460 const char* tmp_end = strchr(path, separator);
461 if (tmp_end == NULL) {
462 expanded_path = add_jars_to_path(expanded_path, path);
463 path = end;
464 } else {
465 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
466 memcpy(dirpath, path, tmp_end - path);
467 dirpath[tmp_end - path] = '\0';
468 expanded_path = add_jars_to_path(expanded_path, dirpath);
469 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
470 path = tmp_end + 1;
471 }
472 }
473 _items[_scp_endorsed] = expanded_path;
474 DEBUG_ONLY(_expansion_done = true;)
475 }
476
477 // Combine the bootclasspath elements, some of which may be null, into a single
478 // c-heap-allocated string.
479 char* SysClassPath::combined_path() {
480 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
481 assert(_expansion_done, "must call expand_endorsed() first.");
482
483 size_t lengths[_scp_nitems];
484 size_t total_len = 0;
485
486 const char separator = *os::path_separator();
487
488 // Get the lengths.
489 int i;
490 for (i = 0; i < _scp_nitems; ++i) {
491 if (_items[i] != NULL) {
492 lengths[i] = strlen(_items[i]);
493 // Include space for the separator char (or a NULL for the last item).
494 total_len += lengths[i] + 1;
495 }
496 }
497 assert(total_len > 0, "empty sysclasspath not allowed");
498
499 // Copy the _items to a single string.
500 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
501 char* cp_tmp = cp;
502 for (i = 0; i < _scp_nitems; ++i) {
503 if (_items[i] != NULL) {
504 memcpy(cp_tmp, _items[i], lengths[i]);
505 cp_tmp += lengths[i];
506 *cp_tmp++ = separator;
507 }
508 }
509 *--cp_tmp = '\0'; // Replace the extra separator.
510 return cp;
511 }
512
513 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
514 char*
515 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
516 char *cp;
517
518 assert(str != NULL, "just checking");
519 if (path == NULL) {
520 size_t len = strlen(str) + 1;
521 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
522 memcpy(cp, str, len); // copy the trailing null
523 } else {
524 const char separator = *os::path_separator();
525 size_t old_len = strlen(path);
526 size_t str_len = strlen(str);
527 size_t len = old_len + str_len + 2;
528
529 if (prepend) {
530 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
531 char* cp_tmp = cp;
532 memcpy(cp_tmp, str, str_len);
533 cp_tmp += str_len;
534 *cp_tmp = separator;
535 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
536 FREE_C_HEAP_ARRAY(char, path, mtInternal);
537 } else {
538 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
539 char* cp_tmp = cp + old_len;
540 *cp_tmp = separator;
541 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
542 }
543 }
544 return cp;
545 }
546
547 // Scan the directory and append any jar or zip files found to path.
548 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
549 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
550 DIR* dir = os::opendir(directory);
551 if (dir == NULL) return path;
552
553 char dir_sep[2] = { '\0', '\0' };
554 size_t directory_len = strlen(directory);
555 const char fileSep = *os::file_separator();
556 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
557
558 /* Scan the directory for jars/zips, appending them to path. */
559 struct dirent *entry;
560 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
561 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
562 const char* name = entry->d_name;
563 const char* ext = name + strlen(name) - 4;
564 bool isJarOrZip = ext > name &&
565 (os::file_name_strcmp(ext, ".jar") == 0 ||
566 os::file_name_strcmp(ext, ".zip") == 0);
567 if (isJarOrZip) {
568 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
569 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
570 path = add_to_path(path, jarpath, false);
571 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
572 }
573 }
574 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
575 os::closedir(dir);
576 return path;
577 }
578
579 // Parses a memory size specification string.
580 static bool atomull(const char *s, julong* result) {
581 julong n = 0;
582 int args_read = sscanf(s, JULONG_FORMAT, &n);
583 if (args_read != 1) {
584 return false;
585 }
586 while (*s != '\0' && isdigit(*s)) {
587 s++;
588 }
589 // 4705540: illegal if more characters are found after the first non-digit
590 if (strlen(s) > 1) {
591 return false;
592 }
593 switch (*s) {
594 case 'T': case 't':
595 *result = n * G * K;
596 // Check for overflow.
597 if (*result/((julong)G * K) != n) return false;
598 return true;
599 case 'G': case 'g':
600 *result = n * G;
601 if (*result/G != n) return false;
602 return true;
603 case 'M': case 'm':
604 *result = n * M;
605 if (*result/M != n) return false;
606 return true;
607 case 'K': case 'k':
608 *result = n * K;
609 if (*result/K != n) return false;
610 return true;
611 case '\0':
612 *result = n;
613 return true;
614 default:
615 return false;
616 }
617 }
618
619 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
620 if (size < min_size) return arg_too_small;
621 // Check that size will fit in a size_t (only relevant on 32-bit)
622 if (size > max_uintx) return arg_too_big;
623 return arg_in_range;
624 }
625
626 // Describe an argument out of range error
627 void Arguments::describe_range_error(ArgsRange errcode) {
628 switch(errcode) {
629 case arg_too_big:
630 jio_fprintf(defaultStream::error_stream(),
631 "The specified size exceeds the maximum "
632 "representable size.\n");
633 break;
634 case arg_too_small:
635 case arg_unreadable:
636 case arg_in_range:
637 // do nothing for now
638 break;
639 default:
640 ShouldNotReachHere();
641 }
642 }
643
644 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
645 return CommandLineFlags::boolAtPut(name, &value, origin);
646 }
647
648 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
649 double v;
650 if (sscanf(value, "%lf", &v) != 1) {
651 return false;
652 }
653
654 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
655 return true;
656 }
657 return false;
658 }
659
660 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
661 julong v;
662 intx intx_v;
663 bool is_neg = false;
664 // Check the sign first since atomull() parses only unsigned values.
665 if (*value == '-') {
666 if (!CommandLineFlags::intxAt(name, &intx_v)) {
667 return false;
668 }
669 value++;
670 is_neg = true;
671 }
672 if (!atomull(value, &v)) {
673 return false;
674 }
675 intx_v = (intx) v;
676 if (is_neg) {
677 intx_v = -intx_v;
678 }
679 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
680 return true;
681 }
682 uintx uintx_v = (uintx) v;
683 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
684 return true;
685 }
686 uint64_t uint64_t_v = (uint64_t) v;
687 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
688 return true;
689 }
690 return false;
691 }
692
693 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
694 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
695 // Contract: CommandLineFlags always returns a pointer that needs freeing.
696 FREE_C_HEAP_ARRAY(char, value, mtInternal);
697 return true;
698 }
699
700 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
701 const char* old_value = "";
702 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
703 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
704 size_t new_len = strlen(new_value);
705 const char* value;
706 char* free_this_too = NULL;
707 if (old_len == 0) {
708 value = new_value;
709 } else if (new_len == 0) {
710 value = old_value;
711 } else {
712 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
713 // each new setting adds another LINE to the switch:
714 sprintf(buf, "%s\n%s", old_value, new_value);
715 value = buf;
716 free_this_too = buf;
717 }
718 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
719 // CommandLineFlags always returns a pointer that needs freeing.
720 FREE_C_HEAP_ARRAY(char, value, mtInternal);
721 if (free_this_too != NULL) {
722 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
723 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
724 }
725 return true;
726 }
727
728 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
729
730 // range of acceptable characters spelled out for portability reasons
731 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
732 #define BUFLEN 255
733 char name[BUFLEN+1];
734 char dummy;
735
736 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
737 return set_bool_flag(name, false, origin);
738 }
739 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
740 return set_bool_flag(name, true, origin);
741 }
742
743 char punct;
744 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
745 const char* value = strchr(arg, '=') + 1;
746 Flag* flag = Flag::find_flag(name, strlen(name));
747 if (flag != NULL && flag->is_ccstr()) {
748 if (flag->ccstr_accumulates()) {
749 return append_to_string_flag(name, value, origin);
750 } else {
751 if (value[0] == '\0') {
752 value = NULL;
753 }
754 return set_string_flag(name, value, origin);
755 }
756 }
757 }
758
759 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
760 const char* value = strchr(arg, '=') + 1;
761 // -XX:Foo:=xxx will reset the string flag to the given value.
762 if (value[0] == '\0') {
763 value = NULL;
764 }
765 return set_string_flag(name, value, origin);
766 }
767
768 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
769 #define SIGNED_NUMBER_RANGE "[-0123456789]"
770 #define NUMBER_RANGE "[0123456789]"
771 char value[BUFLEN + 1];
772 char value2[BUFLEN + 1];
773 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
774 // Looks like a floating-point number -- try again with more lenient format string
775 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
776 return set_fp_numeric_flag(name, value, origin);
777 }
778 }
779
780 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
781 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
782 return set_numeric_flag(name, value, origin);
783 }
784
785 return false;
786 }
787
788 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
789 assert(bldarray != NULL, "illegal argument");
790
791 if (arg == NULL) {
792 return;
793 }
794
795 int new_count = *count + 1;
796
797 // expand the array and add arg to the last element
798 if (*bldarray == NULL) {
799 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
800 } else {
801 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
802 }
803 (*bldarray)[*count] = strdup(arg);
804 *count = new_count;
805 }
806
807 void Arguments::build_jvm_args(const char* arg) {
808 add_string(&_jvm_args_array, &_num_jvm_args, arg);
809 }
810
811 void Arguments::build_jvm_flags(const char* arg) {
812 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
813 }
814
815 // utility function to return a string that concatenates all
816 // strings in a given char** array
817 const char* Arguments::build_resource_string(char** args, int count) {
818 if (args == NULL || count == 0) {
819 return NULL;
820 }
821 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
822 for (int i = 1; i < count; i++) {
823 length += strlen(args[i]) + 1; // add 1 for a space
824 }
825 char* s = NEW_RESOURCE_ARRAY(char, length);
826 strcpy(s, args[0]);
827 for (int j = 1; j < count; j++) {
828 strcat(s, " ");
829 strcat(s, args[j]);
830 }
831 return (const char*) s;
832 }
833
834 void Arguments::print_on(outputStream* st) {
835 st->print_cr("VM Arguments:");
836 if (num_jvm_flags() > 0) {
837 st->print("jvm_flags: "); print_jvm_flags_on(st);
838 }
839 if (num_jvm_args() > 0) {
840 st->print("jvm_args: "); print_jvm_args_on(st);
841 }
842 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
843 if (_java_class_path != NULL) {
844 char* path = _java_class_path->value();
845 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
846 }
847 st->print_cr("Launcher Type: %s", _sun_java_launcher);
848 }
849
850 void Arguments::print_jvm_flags_on(outputStream* st) {
851 if (_num_jvm_flags > 0) {
852 for (int i=0; i < _num_jvm_flags; i++) {
853 st->print("%s ", _jvm_flags_array[i]);
854 }
855 st->print_cr("");
856 }
857 }
858
859 void Arguments::print_jvm_args_on(outputStream* st) {
860 if (_num_jvm_args > 0) {
861 for (int i=0; i < _num_jvm_args; i++) {
862 st->print("%s ", _jvm_args_array[i]);
863 }
864 st->print_cr("");
865 }
866 }
867
868 bool Arguments::process_argument(const char* arg,
869 jboolean ignore_unrecognized, Flag::Flags origin) {
870
871 JDK_Version since = JDK_Version();
872
873 if (parse_argument(arg, origin) || ignore_unrecognized) {
874 return true;
875 }
876
877 bool has_plus_minus = (*arg == '+' || *arg == '-');
878 const char* const argname = has_plus_minus ? arg + 1 : arg;
879 if (is_newly_obsolete(arg, &since)) {
880 char version[256];
881 since.to_string(version, sizeof(version));
882 warning("ignoring option %s; support was removed in %s", argname, version);
883 return true;
884 }
885
886 // For locked flags, report a custom error message if available.
887 // Otherwise, report the standard unrecognized VM option.
888
889 size_t arg_len;
890 const char* equal_sign = strchr(argname, '=');
891 if (equal_sign == NULL) {
892 arg_len = strlen(argname);
893 } else {
894 arg_len = equal_sign - argname;
895 }
896
897 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
898 if (found_flag != NULL) {
899 char locked_message_buf[BUFLEN];
900 found_flag->get_locked_message(locked_message_buf, BUFLEN);
901 if (strlen(locked_message_buf) == 0) {
902 if (found_flag->is_bool() && !has_plus_minus) {
903 jio_fprintf(defaultStream::error_stream(),
904 "Missing +/- setting for VM option '%s'\n", argname);
905 } else if (!found_flag->is_bool() && has_plus_minus) {
906 jio_fprintf(defaultStream::error_stream(),
907 "Unexpected +/- setting in VM option '%s'\n", argname);
908 } else {
909 jio_fprintf(defaultStream::error_stream(),
910 "Improperly specified VM option '%s'\n", argname);
911 }
912 } else {
913 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
914 }
915 } else {
916 jio_fprintf(defaultStream::error_stream(),
917 "Unrecognized VM option '%s'\n", argname);
918 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
919 if (fuzzy_matched != NULL) {
920 jio_fprintf(defaultStream::error_stream(),
921 "Did you mean '%s%s%s'?\n",
922 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
923 fuzzy_matched->_name,
924 (fuzzy_matched->is_bool()) ? "" : "=<value>");
925 }
926 }
927
928 // allow for commandline "commenting out" options like -XX:#+Verbose
929 return arg[0] == '#';
930 }
931
932 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
933 FILE* stream = fopen(file_name, "rb");
934 if (stream == NULL) {
935 if (should_exist) {
936 jio_fprintf(defaultStream::error_stream(),
937 "Could not open settings file %s\n", file_name);
938 return false;
939 } else {
940 return true;
941 }
942 }
943
944 char token[1024];
945 int pos = 0;
946
947 bool in_white_space = true;
948 bool in_comment = false;
949 bool in_quote = false;
950 char quote_c = 0;
951 bool result = true;
952
953 int c = getc(stream);
954 while(c != EOF && pos < (int)(sizeof(token)-1)) {
955 if (in_white_space) {
956 if (in_comment) {
957 if (c == '\n') in_comment = false;
958 } else {
959 if (c == '#') in_comment = true;
960 else if (!isspace(c)) {
961 in_white_space = false;
962 token[pos++] = c;
963 }
964 }
965 } else {
966 if (c == '\n' || (!in_quote && isspace(c))) {
967 // token ends at newline, or at unquoted whitespace
968 // this allows a way to include spaces in string-valued options
969 token[pos] = '\0';
970 logOption(token);
971 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
972 build_jvm_flags(token);
973 pos = 0;
974 in_white_space = true;
975 in_quote = false;
976 } else if (!in_quote && (c == '\'' || c == '"')) {
977 in_quote = true;
978 quote_c = c;
979 } else if (in_quote && (c == quote_c)) {
980 in_quote = false;
981 } else {
982 token[pos++] = c;
983 }
984 }
985 c = getc(stream);
986 }
987 if (pos > 0) {
988 token[pos] = '\0';
989 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
990 build_jvm_flags(token);
991 }
992 fclose(stream);
993 return result;
994 }
995
996 //=============================================================================================================
997 // Parsing of properties (-D)
998
999 const char* Arguments::get_property(const char* key) {
1000 return PropertyList_get_value(system_properties(), key);
1001 }
1002
1003 bool Arguments::add_property(const char* prop) {
1004 const char* eq = strchr(prop, '=');
1005 char* key;
1006 // ns must be static--its address may be stored in a SystemProperty object.
1007 const static char ns[1] = {0};
1008 char* value = (char *)ns;
1009
1010 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1011 key = AllocateHeap(key_len + 1, mtInternal);
1012 strncpy(key, prop, key_len);
1013 key[key_len] = '\0';
1014
1015 if (eq != NULL) {
1016 size_t value_len = strlen(prop) - key_len - 1;
1017 value = AllocateHeap(value_len + 1, mtInternal);
1018 strncpy(value, &prop[key_len + 1], value_len + 1);
1019 }
1020
1021 if (strcmp(key, "java.compiler") == 0) {
1022 process_java_compiler_argument(value);
1023 FreeHeap(key);
1024 if (eq != NULL) {
1025 FreeHeap(value);
1026 }
1027 return true;
1028 } else if (strcmp(key, "sun.java.command") == 0) {
1029 _java_command = value;
1030
1031 // Record value in Arguments, but let it get passed to Java.
1032 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1033 strcmp(key, "sun.java.launcher.pid") == 0) {
1034 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1035 // private and are processed in process_sun_java_launcher_properties();
1036 // the sun.java.launcher property is passed on to the java application
1037 FreeHeap(key);
1038 if (eq != NULL) {
1039 FreeHeap(value);
1040 }
1041 return true;
1042 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1043 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1044 // its value without going through the property list or making a Java call.
1045 _java_vendor_url_bug = value;
1046 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1047 PropertyList_unique_add(&_system_properties, key, value, true);
1048 return true;
1049 }
1050 // Create new property and add at the end of the list
1051 PropertyList_unique_add(&_system_properties, key, value);
1052 return true;
1053 }
1054
1055 //===========================================================================================================
1056 // Setting int/mixed/comp mode flags
1057
1058 void Arguments::set_mode_flags(Mode mode) {
1059 // Set up default values for all flags.
1060 // If you add a flag to any of the branches below,
1061 // add a default value for it here.
1062 set_java_compiler(false);
1063 _mode = mode;
1064
1065 // Ensure Agent_OnLoad has the correct initial values.
1066 // This may not be the final mode; mode may change later in onload phase.
1067 PropertyList_unique_add(&_system_properties, "java.vm.info",
1068 (char*)VM_Version::vm_info_string(), false);
1069
1070 UseInterpreter = true;
1071 UseCompiler = true;
1072 UseLoopCounter = true;
1073
1074 #ifndef ZERO
1075 // Turn these off for mixed and comp. Leave them on for Zero.
1076 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1077 UseFastAccessorMethods = (mode == _int);
1078 }
1079 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1080 UseFastEmptyMethods = (mode == _int);
1081 }
1082 #endif
1083
1084 // Default values may be platform/compiler dependent -
1085 // use the saved values
1086 ClipInlining = Arguments::_ClipInlining;
1087 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1088 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1089 BackgroundCompilation = Arguments::_BackgroundCompilation;
1090
1091 // Change from defaults based on mode
1092 switch (mode) {
1093 default:
1094 ShouldNotReachHere();
1095 break;
1096 case _int:
1097 UseCompiler = false;
1098 UseLoopCounter = false;
1099 AlwaysCompileLoopMethods = false;
1100 UseOnStackReplacement = false;
1101 break;
1102 case _mixed:
1103 // same as default
1104 break;
1105 case _comp:
1106 UseInterpreter = false;
1107 BackgroundCompilation = false;
1108 ClipInlining = false;
1109 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1110 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1111 // compile a level 4 (C2) and then continue executing it.
1112 if (TieredCompilation) {
1113 Tier3InvokeNotifyFreqLog = 0;
1114 Tier4InvocationThreshold = 0;
1115 }
1116 break;
1117 }
1118 }
1119
1120 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1121 // Conflict: required to use shared spaces (-Xshare:on), but
1122 // incompatible command line options were chosen.
1123
1124 static void no_shared_spaces() {
1125 if (RequireSharedSpaces) {
1126 jio_fprintf(defaultStream::error_stream(),
1127 "Class data sharing is inconsistent with other specified options.\n");
1128 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1129 } else {
1130 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1131 }
1132 }
1133 #endif
1134
1135 void Arguments::set_tiered_flags() {
1136 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1137 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1138 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1139 }
1140 if (CompilationPolicyChoice < 2) {
1141 vm_exit_during_initialization(
1142 "Incompatible compilation policy selected", NULL);
1143 }
1144 // Increase the code cache size - tiered compiles a lot more.
1145 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1146 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1147 }
1148 if (!UseInterpreter) { // -Xcomp
1149 Tier3InvokeNotifyFreqLog = 0;
1150 Tier4InvocationThreshold = 0;
1151 }
1152 }
1153
1154 /**
1155 * Returns the minimum number of compiler threads needed to run the JVM. The following
1156 * configurations are possible.
1157 *
1158 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1159 * compiler threads is 0.
1160 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1161 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1162 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1163 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1164 * C1 can be used, so the minimum number of compiler threads is 1.
1165 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1166 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1167 * the minimum number of compiler threads is 2.
1168 */
1169 int Arguments::get_min_number_of_compiler_threads() {
1170 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1171 return 0; // case 1
1172 #else
1173 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1174 return 1; // case 2 or case 3
1175 }
1176 return 2; // case 4 (tiered)
1177 #endif
1178 }
1179
1180 #if INCLUDE_ALL_GCS
1181 static void disable_adaptive_size_policy(const char* collector_name) {
1182 if (UseAdaptiveSizePolicy) {
1183 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1184 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1185 collector_name);
1186 }
1187 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1188 }
1189 }
1190
1191 void Arguments::set_parnew_gc_flags() {
1192 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1193 "control point invariant");
1194 assert(UseParNewGC, "Error");
1195
1196 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1197 disable_adaptive_size_policy("UseParNewGC");
1198
1199 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1200 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1201 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1202 } else if (ParallelGCThreads == 0) {
1203 jio_fprintf(defaultStream::error_stream(),
1204 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1205 vm_exit(1);
1206 }
1207
1208 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1209 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1210 // we set them to 1024 and 1024.
1211 // See CR 6362902.
1212 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1213 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1214 }
1215 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1216 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1217 }
1218
1219 // When using compressed oops, we use local overflow stacks,
1220 // rather than using a global overflow list chained through
1221 // the klass word of the object's pre-image.
1222 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1223 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1224 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1225 }
1226 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1227 }
1228 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1229 }
1230
1231 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1232 // sparc/solaris for certain applications, but would gain from
1233 // further optimization and tuning efforts, and would almost
1234 // certainly gain from analysis of platform and environment.
1235 void Arguments::set_cms_and_parnew_gc_flags() {
1236 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1237 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1238
1239 // If we are using CMS, we prefer to UseParNewGC,
1240 // unless explicitly forbidden.
1241 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1242 FLAG_SET_ERGO(bool, UseParNewGC, true);
1243 }
1244
1245 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1246 disable_adaptive_size_policy("UseConcMarkSweepGC");
1247
1248 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1249 // as needed.
1250 if (UseParNewGC) {
1251 set_parnew_gc_flags();
1252 }
1253
1254 size_t max_heap = align_size_down(MaxHeapSize,
1255 CardTableRS::ct_max_alignment_constraint());
1256
1257 // Now make adjustments for CMS
1258 intx tenuring_default = (intx)6;
1259 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1260
1261 // Preferred young gen size for "short" pauses:
1262 // upper bound depends on # of threads and NewRatio.
1263 const uintx parallel_gc_threads =
1264 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1265 const size_t preferred_max_new_size_unaligned =
1266 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1267 size_t preferred_max_new_size =
1268 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1269
1270 // Unless explicitly requested otherwise, size young gen
1271 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1272
1273 // If either MaxNewSize or NewRatio is set on the command line,
1274 // assume the user is trying to set the size of the young gen.
1275 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1276
1277 // Set MaxNewSize to our calculated preferred_max_new_size unless
1278 // NewSize was set on the command line and it is larger than
1279 // preferred_max_new_size.
1280 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1281 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1282 } else {
1283 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1284 }
1285 if (PrintGCDetails && Verbose) {
1286 // Too early to use gclog_or_tty
1287 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1288 }
1289
1290 // Code along this path potentially sets NewSize and OldSize
1291 if (PrintGCDetails && Verbose) {
1292 // Too early to use gclog_or_tty
1293 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1294 " initial_heap_size: " SIZE_FORMAT
1295 " max_heap: " SIZE_FORMAT,
1296 min_heap_size(), InitialHeapSize, max_heap);
1297 }
1298 size_t min_new = preferred_max_new_size;
1299 if (FLAG_IS_CMDLINE(NewSize)) {
1300 min_new = NewSize;
1301 }
1302 if (max_heap > min_new && min_heap_size() > min_new) {
1303 // Unless explicitly requested otherwise, make young gen
1304 // at least min_new, and at most preferred_max_new_size.
1305 if (FLAG_IS_DEFAULT(NewSize)) {
1306 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1307 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1308 if (PrintGCDetails && Verbose) {
1309 // Too early to use gclog_or_tty
1310 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1311 }
1312 }
1313 // Unless explicitly requested otherwise, size old gen
1314 // so it's NewRatio x of NewSize.
1315 if (FLAG_IS_DEFAULT(OldSize)) {
1316 if (max_heap > NewSize) {
1317 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1318 if (PrintGCDetails && Verbose) {
1319 // Too early to use gclog_or_tty
1320 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1321 }
1322 }
1323 }
1324 }
1325 }
1326 // Unless explicitly requested otherwise, definitely
1327 // promote all objects surviving "tenuring_default" scavenges.
1328 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1329 FLAG_IS_DEFAULT(SurvivorRatio)) {
1330 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1331 }
1332 // If we decided above (or user explicitly requested)
1333 // `promote all' (via MaxTenuringThreshold := 0),
1334 // prefer minuscule survivor spaces so as not to waste
1335 // space for (non-existent) survivors
1336 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1337 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1338 }
1339 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1340 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1341 // This is done in order to make ParNew+CMS configuration to work
1342 // with YoungPLABSize and OldPLABSize options.
1343 // See CR 6362902.
1344 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1345 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1346 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1347 // is. In this situation let CMSParPromoteBlocksToClaim follow
1348 // the value (either from the command line or ergonomics) of
1349 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1350 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1351 } else {
1352 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1353 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1354 // we'll let it to take precedence.
1355 jio_fprintf(defaultStream::error_stream(),
1356 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1357 " options are specified for the CMS collector."
1358 " CMSParPromoteBlocksToClaim will take precedence.\n");
1359 }
1360 }
1361 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1362 // OldPLAB sizing manually turned off: Use a larger default setting,
1363 // unless it was manually specified. This is because a too-low value
1364 // will slow down scavenges.
1365 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1366 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1367 }
1368 }
1369 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1370 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1371 // If either of the static initialization defaults have changed, note this
1372 // modification.
1373 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1374 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1375 }
1376 if (PrintGCDetails && Verbose) {
1377 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1378 MarkStackSize / K, MarkStackSizeMax / K);
1379 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1380 }
1381 }
1382 #endif // INCLUDE_ALL_GCS
1383
1384 void set_object_alignment() {
1385 // Object alignment.
1386 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1387 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1388 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1389 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1390 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1391 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1392
1393 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1394 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1395
1396 // Oop encoding heap max
1397 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1398
1399 #if INCLUDE_ALL_GCS
1400 // Set CMS global values
1401 CompactibleFreeListSpace::set_cms_values();
1402 #endif // INCLUDE_ALL_GCS
1403 }
1404
1405 bool verify_object_alignment() {
1406 // Object alignment.
1407 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1408 jio_fprintf(defaultStream::error_stream(),
1409 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1410 (int)ObjectAlignmentInBytes);
1411 return false;
1412 }
1413 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1414 jio_fprintf(defaultStream::error_stream(),
1415 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1416 (int)ObjectAlignmentInBytes, BytesPerLong);
1417 return false;
1418 }
1419 // It does not make sense to have big object alignment
1420 // since a space lost due to alignment will be greater
1421 // then a saved space from compressed oops.
1422 if ((int)ObjectAlignmentInBytes > 256) {
1423 jio_fprintf(defaultStream::error_stream(),
1424 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1425 (int)ObjectAlignmentInBytes);
1426 return false;
1427 }
1428 // In case page size is very small.
1429 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1430 jio_fprintf(defaultStream::error_stream(),
1431 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1432 (int)ObjectAlignmentInBytes, os::vm_page_size());
1433 return false;
1434 }
1435 return true;
1436 }
1437
1438 uintx Arguments::max_heap_for_compressed_oops() {
1439 // Avoid sign flip.
1440 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1441 // We need to fit both the NULL page and the heap into the memory budget, while
1442 // keeping alignment constraints of the heap. To guarantee the latter, as the
1443 // NULL page is located before the heap, we pad the NULL page to the conservative
1444 // maximum alignment that the GC may ever impose upon the heap.
1445 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1446 _conservative_max_heap_alignment);
1447
1448 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1449 NOT_LP64(ShouldNotReachHere(); return 0);
1450 }
1451
1452 bool Arguments::should_auto_select_low_pause_collector() {
1453 if (UseAutoGCSelectPolicy &&
1454 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1455 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1456 if (PrintGCDetails) {
1457 // Cannot use gclog_or_tty yet.
1458 tty->print_cr("Automatic selection of the low pause collector"
1459 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1460 }
1461 return true;
1462 }
1463 return false;
1464 }
1465
1466 void Arguments::set_use_compressed_oops() {
1467 #ifndef ZERO
1468 #ifdef _LP64
1469 // MaxHeapSize is not set up properly at this point, but
1470 // the only value that can override MaxHeapSize if we are
1471 // to use UseCompressedOops is InitialHeapSize.
1472 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1473
1474 if (max_heap_size <= max_heap_for_compressed_oops()) {
1475 #if !defined(COMPILER1) || defined(TIERED)
1476 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1477 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1478 }
1479 #endif
1480 #ifdef _WIN64
1481 if (UseLargePages && UseCompressedOops) {
1482 // Cannot allocate guard pages for implicit checks in indexed addressing
1483 // mode, when large pages are specified on windows.
1484 // This flag could be switched ON if narrow oop base address is set to 0,
1485 // see code in Universe::initialize_heap().
1486 Universe::set_narrow_oop_use_implicit_null_checks(false);
1487 }
1488 #endif // _WIN64
1489 } else {
1490 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1491 warning("Max heap size too large for Compressed Oops");
1492 FLAG_SET_DEFAULT(UseCompressedOops, false);
1493 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1494 }
1495 }
1496 #endif // _LP64
1497 #endif // ZERO
1498 }
1499
1500
1501 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1502 // set_use_compressed_oops().
1503 void Arguments::set_use_compressed_klass_ptrs() {
1504 #ifndef ZERO
1505 #ifdef _LP64
1506 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1507 if (!UseCompressedOops) {
1508 if (UseCompressedClassPointers) {
1509 warning("UseCompressedClassPointers requires UseCompressedOops");
1510 }
1511 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1512 } else {
1513 // Turn on UseCompressedClassPointers too
1514 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1515 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1516 }
1517 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1518 if (UseCompressedClassPointers) {
1519 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1520 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1521 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1522 }
1523 }
1524 }
1525 #endif // _LP64
1526 #endif // !ZERO
1527 }
1528
1529 void Arguments::set_conservative_max_heap_alignment() {
1530 // The conservative maximum required alignment for the heap is the maximum of
1531 // the alignments imposed by several sources: any requirements from the heap
1532 // itself, the collector policy and the maximum page size we may run the VM
1533 // with.
1534 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1535 #if INCLUDE_ALL_GCS
1536 if (UseParallelGC) {
1537 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1538 } else if (UseG1GC) {
1539 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1540 }
1541 #endif // INCLUDE_ALL_GCS
1542 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(),
1543 CollectorPolicy::compute_heap_alignment());
1544 }
1545
1546 void Arguments::set_ergonomics_flags() {
1547
1548 if (os::is_server_class_machine()) {
1549 // If no other collector is requested explicitly,
1550 // let the VM select the collector based on
1551 // machine class and automatic selection policy.
1552 if (!UseSerialGC &&
1553 !UseConcMarkSweepGC &&
1554 !UseG1GC &&
1555 !UseParNewGC &&
1556 FLAG_IS_DEFAULT(UseParallelGC)) {
1557 if (should_auto_select_low_pause_collector()) {
1558 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1559 } else {
1560 FLAG_SET_ERGO(bool, UseParallelGC, true);
1561 }
1562 }
1563 }
1564 #ifdef COMPILER2
1565 // Shared spaces work fine with other GCs but causes bytecode rewriting
1566 // to be disabled, which hurts interpreter performance and decreases
1567 // server performance. When -server is specified, keep the default off
1568 // unless it is asked for. Future work: either add bytecode rewriting
1569 // at link time, or rewrite bytecodes in non-shared methods.
1570 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1571 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1572 no_shared_spaces();
1573 }
1574 #endif
1575
1576 set_conservative_max_heap_alignment();
1577
1578 #ifndef ZERO
1579 #ifdef _LP64
1580 set_use_compressed_oops();
1581
1582 // set_use_compressed_klass_ptrs() must be called after calling
1583 // set_use_compressed_oops().
1584 set_use_compressed_klass_ptrs();
1585
1586 // Also checks that certain machines are slower with compressed oops
1587 // in vm_version initialization code.
1588 #endif // _LP64
1589 #endif // !ZERO
1590 }
1591
1592 void Arguments::set_parallel_gc_flags() {
1593 assert(UseParallelGC || UseParallelOldGC, "Error");
1594 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1595 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1596 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1597 }
1598 FLAG_SET_DEFAULT(UseParallelGC, true);
1599
1600 // If no heap maximum was requested explicitly, use some reasonable fraction
1601 // of the physical memory, up to a maximum of 1GB.
1602 FLAG_SET_DEFAULT(ParallelGCThreads,
1603 Abstract_VM_Version::parallel_worker_threads());
1604 if (ParallelGCThreads == 0) {
1605 jio_fprintf(defaultStream::error_stream(),
1606 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1607 vm_exit(1);
1608 }
1609
1610 if (UseAdaptiveSizePolicy) {
1611 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1612 // unless the user actually sets these flags.
1613 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1614 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1615 }
1616 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1617 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1618 }
1619 }
1620
1621 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1622 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1623 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1624 // See CR 6362902 for details.
1625 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1626 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1627 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1628 }
1629 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1630 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1631 }
1632 }
1633
1634 if (UseParallelOldGC) {
1635 // Par compact uses lower default values since they are treated as
1636 // minimums. These are different defaults because of the different
1637 // interpretation and are not ergonomically set.
1638 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1639 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1640 }
1641 }
1642 }
1643
1644 void Arguments::set_g1_gc_flags() {
1645 assert(UseG1GC, "Error");
1646 #ifdef COMPILER1
1647 FastTLABRefill = false;
1648 #endif
1649 FLAG_SET_DEFAULT(ParallelGCThreads,
1650 Abstract_VM_Version::parallel_worker_threads());
1651 if (ParallelGCThreads == 0) {
1652 FLAG_SET_DEFAULT(ParallelGCThreads,
1653 Abstract_VM_Version::parallel_worker_threads());
1654 }
1655
1656 // MarkStackSize will be set (if it hasn't been set by the user)
1657 // when concurrent marking is initialized.
1658 // Its value will be based upon the number of parallel marking threads.
1659 // But we do set the maximum mark stack size here.
1660 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1661 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1662 }
1663
1664 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1665 // In G1, we want the default GC overhead goal to be higher than
1666 // say in PS. So we set it here to 10%. Otherwise the heap might
1667 // be expanded more aggressively than we would like it to. In
1668 // fact, even 10% seems to not be high enough in some cases
1669 // (especially small GC stress tests that the main thing they do
1670 // is allocation). We might consider increase it further.
1671 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1672 }
1673
1674 if (PrintGCDetails && Verbose) {
1675 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1676 MarkStackSize / K, MarkStackSizeMax / K);
1677 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1678 }
1679 }
1680
1681 julong Arguments::limit_by_allocatable_memory(julong limit) {
1682 julong max_allocatable;
1683 julong result = limit;
1684 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1685 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1686 }
1687 return result;
1688 }
1689
1690 // Use static initialization to get the default before parsing
1691 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1692
1693 void Arguments::set_heap_size() {
1694 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1695 // Deprecated flag
1696 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1697 }
1698
1699 const julong phys_mem =
1700 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1701 : (julong)MaxRAM;
1702
1703 // If the maximum heap size has not been set with -Xmx,
1704 // then set it as fraction of the size of physical memory,
1705 // respecting the maximum and minimum sizes of the heap.
1706 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1707 julong reasonable_max = phys_mem / MaxRAMFraction;
1708
1709 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1710 // Small physical memory, so use a minimum fraction of it for the heap
1711 reasonable_max = phys_mem / MinRAMFraction;
1712 } else {
1713 // Not-small physical memory, so require a heap at least
1714 // as large as MaxHeapSize
1715 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1716 }
1717 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1718 // Limit the heap size to ErgoHeapSizeLimit
1719 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1720 }
1721 if (UseCompressedOops) {
1722 // Limit the heap size to the maximum possible when using compressed oops
1723 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1724
1725 // HeapBaseMinAddress can be greater than default but not less than.
1726 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1727 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1728 // matches compressed oops printing flags
1729 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1730 jio_fprintf(defaultStream::error_stream(),
1731 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1732 " (" UINTX_FORMAT "G) which is greater than value given "
1733 UINTX_FORMAT "\n",
1734 DefaultHeapBaseMinAddress,
1735 DefaultHeapBaseMinAddress/G,
1736 HeapBaseMinAddress);
1737 }
1738 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1739 }
1740 }
1741
1742 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1743 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1744 // but it should be not less than default MaxHeapSize.
1745 max_coop_heap -= HeapBaseMinAddress;
1746 }
1747 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1748 }
1749 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1750
1751 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1752 // An initial heap size was specified on the command line,
1753 // so be sure that the maximum size is consistent. Done
1754 // after call to limit_by_allocatable_memory because that
1755 // method might reduce the allocation size.
1756 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1757 }
1758
1759 if (PrintGCDetails && Verbose) {
1760 // Cannot use gclog_or_tty yet.
1761 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1762 }
1763 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1764 }
1765
1766 // If the minimum or initial heap_size have not been set or requested to be set
1767 // ergonomically, set them accordingly.
1768 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1769 julong reasonable_minimum = (julong)(OldSize + NewSize);
1770
1771 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1772
1773 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1774
1775 if (InitialHeapSize == 0) {
1776 julong reasonable_initial = phys_mem / InitialRAMFraction;
1777
1778 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1779 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1780
1781 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1782
1783 if (PrintGCDetails && Verbose) {
1784 // Cannot use gclog_or_tty yet.
1785 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1786 }
1787 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1788 }
1789 // If the minimum heap size has not been set (via -Xms),
1790 // synchronize with InitialHeapSize to avoid errors with the default value.
1791 if (min_heap_size() == 0) {
1792 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1793 if (PrintGCDetails && Verbose) {
1794 // Cannot use gclog_or_tty yet.
1795 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1796 }
1797 }
1798 }
1799 }
1800
1801 // This must be called after ergonomics because we want bytecode rewriting
1802 // if the server compiler is used, or if UseSharedSpaces is disabled.
1803 void Arguments::set_bytecode_flags() {
1804 // Better not attempt to store into a read-only space.
1805 if (UseSharedSpaces) {
1806 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1807 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1808 }
1809
1810 if (!RewriteBytecodes) {
1811 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1812 }
1813 }
1814
1815 // Aggressive optimization flags -XX:+AggressiveOpts
1816 void Arguments::set_aggressive_opts_flags() {
1817 #ifdef COMPILER2
1818 if (AggressiveUnboxing) {
1819 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1820 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1821 } else if (!EliminateAutoBox) {
1822 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1823 AggressiveUnboxing = false;
1824 }
1825 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1826 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1827 } else if (!DoEscapeAnalysis) {
1828 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1829 AggressiveUnboxing = false;
1830 }
1831 }
1832 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1833 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1834 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1835 }
1836 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1837 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1838 }
1839
1840 // Feed the cache size setting into the JDK
1841 char buffer[1024];
1842 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1843 add_property(buffer);
1844 }
1845 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1846 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1847 }
1848 #endif
1849
1850 if (AggressiveOpts) {
1851 // Sample flag setting code
1852 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1853 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1854 // }
1855 }
1856 }
1857
1858 //===========================================================================================================
1859 // Parsing of java.compiler property
1860
1861 void Arguments::process_java_compiler_argument(char* arg) {
1862 // For backwards compatibility, Djava.compiler=NONE or ""
1863 // causes us to switch to -Xint mode UNLESS -Xdebug
1864 // is also specified.
1865 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1866 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1867 }
1868 }
1869
1870 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1871 _sun_java_launcher = strdup(launcher);
1872 }
1873
1874 bool Arguments::created_by_java_launcher() {
1875 assert(_sun_java_launcher != NULL, "property must have value");
1876 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1877 }
1878
1879 bool Arguments::sun_java_launcher_is_altjvm() {
1880 return _sun_java_launcher_is_altjvm;
1881 }
1882
1883 //===========================================================================================================
1884 // Parsing of main arguments
1885
1886 bool Arguments::verify_interval(uintx val, uintx min,
1887 uintx max, const char* name) {
1888 // Returns true iff value is in the inclusive interval [min..max]
1889 // false, otherwise.
1890 if (val >= min && val <= max) {
1891 return true;
1892 }
1893 jio_fprintf(defaultStream::error_stream(),
1894 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1895 " and " UINTX_FORMAT "\n",
1896 name, val, min, max);
1897 return false;
1898 }
1899
1900 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1901 // Returns true if given value is at least specified min threshold
1902 // false, otherwise.
1903 if (val >= min ) {
1904 return true;
1905 }
1906 jio_fprintf(defaultStream::error_stream(),
1907 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1908 name, val, min);
1909 return false;
1910 }
1911
1912 bool Arguments::verify_percentage(uintx value, const char* name) {
1913 if (is_percentage(value)) {
1914 return true;
1915 }
1916 jio_fprintf(defaultStream::error_stream(),
1917 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1918 name, value);
1919 return false;
1920 }
1921
1922 #if !INCLUDE_ALL_GCS
1923 #ifdef ASSERT
1924 static bool verify_serial_gc_flags() {
1925 return (UseSerialGC &&
1926 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1927 UseParallelGC || UseParallelOldGC));
1928 }
1929 #endif // ASSERT
1930 #endif // INCLUDE_ALL_GCS
1931
1932 // check if do gclog rotation
1933 // +UseGCLogFileRotation is a must,
1934 // no gc log rotation when log file not supplied or
1935 // NumberOfGCLogFiles is 0
1936 void check_gclog_consistency() {
1937 if (UseGCLogFileRotation) {
1938 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1939 jio_fprintf(defaultStream::output_stream(),
1940 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1941 "where num_of_file > 0\n"
1942 "GC log rotation is turned off\n");
1943 UseGCLogFileRotation = false;
1944 }
1945 }
1946
1947 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1948 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1949 jio_fprintf(defaultStream::output_stream(),
1950 "GCLogFileSize changed to minimum 8K\n");
1951 }
1952 }
1953
1954 // This function is called for -Xloggc:<filename>, it can be used
1955 // to check if a given file name(or string) conforms to the following
1956 // specification:
1957 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1958 // %p and %t only allowed once. We only limit usage of filename not path
1959 bool is_filename_valid(const char *file_name) {
1960 const char* p = file_name;
1961 char file_sep = os::file_separator()[0];
1962 const char* cp;
1963 // skip prefix path
1964 for (cp = file_name; *cp != '\0'; cp++) {
1965 if (*cp == '/' || *cp == file_sep) {
1966 p = cp + 1;
1967 }
1968 }
1969
1970 int count_p = 0;
1971 int count_t = 0;
1972 while (*p != '\0') {
1973 if ((*p >= '0' && *p <= '9') ||
1974 (*p >= 'A' && *p <= 'Z') ||
1975 (*p >= 'a' && *p <= 'z') ||
1976 *p == '-' ||
1977 *p == '_' ||
1978 *p == '.') {
1979 p++;
1980 continue;
1981 }
1982 if (*p == '%') {
1983 if(*(p + 1) == 'p') {
1984 p += 2;
1985 count_p ++;
1986 continue;
1987 }
1988 if (*(p + 1) == 't') {
1989 p += 2;
1990 count_t ++;
1991 continue;
1992 }
1993 }
1994 return false;
1995 }
1996 return count_p < 2 && count_t < 2;
1997 }
1998
1999 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2000 if (!is_percentage(min_heap_free_ratio)) {
2001 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2002 return false;
2003 }
2004 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2005 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2006 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2007 MaxHeapFreeRatio);
2008 return false;
2009 }
2010 return true;
2011 }
2012
2013 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2014 if (!is_percentage(max_heap_free_ratio)) {
2015 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2016 return false;
2017 }
2018 if (max_heap_free_ratio < MinHeapFreeRatio) {
2019 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2020 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2021 MinHeapFreeRatio);
2022 return false;
2023 }
2024 return true;
2025 }
2026
2027 // Check consistency of GC selection
2028 bool Arguments::check_gc_consistency() {
2029 check_gclog_consistency();
2030 bool status = true;
2031 // Ensure that the user has not selected conflicting sets
2032 // of collectors. [Note: this check is merely a user convenience;
2033 // collectors over-ride each other so that only a non-conflicting
2034 // set is selected; however what the user gets is not what they
2035 // may have expected from the combination they asked for. It's
2036 // better to reduce user confusion by not allowing them to
2037 // select conflicting combinations.
2038 uint i = 0;
2039 if (UseSerialGC) i++;
2040 if (UseConcMarkSweepGC || UseParNewGC) i++;
2041 if (UseParallelGC || UseParallelOldGC) i++;
2042 if (UseG1GC) i++;
2043 if (i > 1) {
2044 jio_fprintf(defaultStream::error_stream(),
2045 "Conflicting collector combinations in option list; "
2046 "please refer to the release notes for the combinations "
2047 "allowed\n");
2048 status = false;
2049 }
2050 return status;
2051 }
2052
2053 void Arguments::check_deprecated_gcs() {
2054 if (UseConcMarkSweepGC && !UseParNewGC) {
2055 warning("Using the DefNew young collector with the CMS collector is deprecated "
2056 "and will likely be removed in a future release");
2057 }
2058
2059 if (UseParNewGC && !UseConcMarkSweepGC) {
2060 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2061 // set up UseSerialGC properly, so that can't be used in the check here.
2062 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2063 "and will likely be removed in a future release");
2064 }
2065
2066 if (CMSIncrementalMode) {
2067 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2068 }
2069 }
2070
2071 void Arguments::check_deprecated_gc_flags() {
2072 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2073 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2074 "and will likely be removed in future release");
2075 }
2076 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2077 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2078 "Use MaxRAMFraction instead.");
2079 }
2080 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2081 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2082 }
2083 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2084 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2085 }
2086 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2087 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2088 }
2089 }
2090
2091 // Check stack pages settings
2092 bool Arguments::check_stack_pages()
2093 {
2094 bool status = true;
2095 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2096 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2097 // greater stack shadow pages can't generate instruction to bang stack
2098 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2099 return status;
2100 }
2101
2102 // Check the consistency of vm_init_args
2103 bool Arguments::check_vm_args_consistency() {
2104 // Method for adding checks for flag consistency.
2105 // The intent is to warn the user of all possible conflicts,
2106 // before returning an error.
2107 // Note: Needs platform-dependent factoring.
2108 bool status = true;
2109
2110 if (TLABRefillWasteFraction == 0) {
2111 jio_fprintf(defaultStream::error_stream(),
2112 "TLABRefillWasteFraction should be a denominator, "
2113 "not " SIZE_FORMAT "\n",
2114 TLABRefillWasteFraction);
2115 status = false;
2116 }
2117
2118 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2119 "AdaptiveSizePolicyWeight");
2120 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2121
2122 // Divide by bucket size to prevent a large size from causing rollover when
2123 // calculating amount of memory needed to be allocated for the String table.
2124 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2125 (max_uintx / StringTable::bucket_size()), "StringTable size");
2126
2127 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2128 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2129
2130 {
2131 // Using "else if" below to avoid printing two error messages if min > max.
2132 // This will also prevent us from reporting both min>100 and max>100 at the
2133 // same time, but that is less annoying than printing two identical errors IMHO.
2134 FormatBuffer<80> err_msg("");
2135 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2136 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2137 status = false;
2138 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2139 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2140 status = false;
2141 }
2142 }
2143
2144 // Min/MaxMetaspaceFreeRatio
2145 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2146 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2147
2148 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2149 jio_fprintf(defaultStream::error_stream(),
2150 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2151 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2152 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2153 MinMetaspaceFreeRatio,
2154 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2155 MaxMetaspaceFreeRatio);
2156 status = false;
2157 }
2158
2159 // Trying to keep 100% free is not practical
2160 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2161
2162 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2163 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2164 }
2165
2166 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2167 // Settings to encourage splitting.
2168 if (!FLAG_IS_CMDLINE(NewRatio)) {
2169 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2170 }
2171 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2172 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2173 }
2174 }
2175
2176 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2177 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2178 if (GCTimeLimit == 100) {
2179 // Turn off gc-overhead-limit-exceeded checks
2180 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2181 }
2182
2183 status = status && check_gc_consistency();
2184 status = status && check_stack_pages();
2185
2186 if (CMSIncrementalMode) {
2187 if (!UseConcMarkSweepGC) {
2188 jio_fprintf(defaultStream::error_stream(),
2189 "error: invalid argument combination.\n"
2190 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2191 "selected in order\nto use CMSIncrementalMode.\n");
2192 status = false;
2193 } else {
2194 status = status && verify_percentage(CMSIncrementalDutyCycle,
2195 "CMSIncrementalDutyCycle");
2196 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2197 "CMSIncrementalDutyCycleMin");
2198 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2199 "CMSIncrementalSafetyFactor");
2200 status = status && verify_percentage(CMSIncrementalOffset,
2201 "CMSIncrementalOffset");
2202 status = status && verify_percentage(CMSExpAvgFactor,
2203 "CMSExpAvgFactor");
2204 // If it was not set on the command line, set
2205 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2206 if (CMSInitiatingOccupancyFraction < 0) {
2207 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2208 }
2209 }
2210 }
2211
2212 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2213 // insists that we hold the requisite locks so that the iteration is
2214 // MT-safe. For the verification at start-up and shut-down, we don't
2215 // yet have a good way of acquiring and releasing these locks,
2216 // which are not visible at the CollectedHeap level. We want to
2217 // be able to acquire these locks and then do the iteration rather
2218 // than just disable the lock verification. This will be fixed under
2219 // bug 4788986.
2220 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2221 if (VerifyDuringStartup) {
2222 warning("Heap verification at start-up disabled "
2223 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2224 VerifyDuringStartup = false; // Disable verification at start-up
2225 }
2226
2227 if (VerifyBeforeExit) {
2228 warning("Heap verification at shutdown disabled "
2229 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2230 VerifyBeforeExit = false; // Disable verification at shutdown
2231 }
2232 }
2233
2234 // Note: only executed in non-PRODUCT mode
2235 if (!UseAsyncConcMarkSweepGC &&
2236 (ExplicitGCInvokesConcurrent ||
2237 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2238 jio_fprintf(defaultStream::error_stream(),
2239 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2240 " with -UseAsyncConcMarkSweepGC");
2241 status = false;
2242 }
2243
2244 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2245
2246 #if INCLUDE_ALL_GCS
2247 if (UseG1GC) {
2248 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2249 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2250 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2251
2252 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2253 "InitiatingHeapOccupancyPercent");
2254 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2255 "G1RefProcDrainInterval");
2256 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2257 "G1ConcMarkStepDurationMillis");
2258 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2259 "G1ConcRSHotCardLimit");
2260 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2261 "G1ConcRSLogCacheSize");
2262 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2263 "StringDeduplicationAgeThreshold");
2264 }
2265 if (UseConcMarkSweepGC) {
2266 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2267 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2268 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2269 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2270
2271 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2272
2273 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2274 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2275 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2276
2277 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2278
2279 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2280 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2281
2282 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2283 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2284 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2285
2286 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2287
2288 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2289
2290 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2291 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2292 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2293 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2294 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2295 }
2296
2297 if (UseParallelGC || UseParallelOldGC) {
2298 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2299 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2300
2301 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2302 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2303
2304 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2305 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2306
2307 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2308
2309 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2310 }
2311 #endif // INCLUDE_ALL_GCS
2312
2313 status = status && verify_interval(RefDiscoveryPolicy,
2314 ReferenceProcessor::DiscoveryPolicyMin,
2315 ReferenceProcessor::DiscoveryPolicyMax,
2316 "RefDiscoveryPolicy");
2317
2318 // Limit the lower bound of this flag to 1 as it is used in a division
2319 // expression.
2320 status = status && verify_interval(TLABWasteTargetPercent,
2321 1, 100, "TLABWasteTargetPercent");
2322
2323 status = status && verify_object_alignment();
2324
2325 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2326 "CompressedClassSpaceSize");
2327
2328 status = status && verify_interval(MarkStackSizeMax,
2329 1, (max_jint - 1), "MarkStackSizeMax");
2330 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2331
2332 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2333
2334 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2335
2336 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2337
2338 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2339 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2340
2341 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2342
2343 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2344 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2345 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2346 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2347
2348 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2349 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2350
2351 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2352 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2353 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2354
2355 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2356 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2357
2358 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2359 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2360 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2361 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2362
2363 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2364
2365 if (PrintNMTStatistics) {
2366 #if INCLUDE_NMT
2367 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2368 #endif // INCLUDE_NMT
2369 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2370 PrintNMTStatistics = false;
2371 #if INCLUDE_NMT
2372 }
2373 #endif
2374 }
2375
2376 // Need to limit the extent of the padding to reasonable size.
2377 // 8K is well beyond the reasonable HW cache line size, even with the
2378 // aggressive prefetching, while still leaving the room for segregating
2379 // among the distinct pages.
2380 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2381 jio_fprintf(defaultStream::error_stream(),
2382 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2383 ContendedPaddingWidth, 0, 8192);
2384 status = false;
2385 }
2386
2387 // Need to enforce the padding not to break the existing field alignments.
2388 // It is sufficient to check against the largest type size.
2389 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2390 jio_fprintf(defaultStream::error_stream(),
2391 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2392 ContendedPaddingWidth, BytesPerLong);
2393 status = false;
2394 }
2395
2396 // Check lower bounds of the code cache
2397 // Template Interpreter code is approximately 3X larger in debug builds.
2398 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2399 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2400 jio_fprintf(defaultStream::error_stream(),
2401 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2402 os::vm_page_size()/K);
2403 status = false;
2404 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2405 jio_fprintf(defaultStream::error_stream(),
2406 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2407 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2408 status = false;
2409 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2410 jio_fprintf(defaultStream::error_stream(),
2411 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2412 min_code_cache_size/K);
2413 status = false;
2414 } else if (ReservedCodeCacheSize > 2*G) {
2415 // Code cache size larger than MAXINT is not supported.
2416 jio_fprintf(defaultStream::error_stream(),
2417 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2418 (2*G)/M);
2419 status = false;
2420 }
2421
2422 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2423 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2424 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2425 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2426
2427 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2428 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2429 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2430 // Check the minimum number of compiler threads
2431 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2432
2433 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2434 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2435 }
2436
2437 return status;
2438 }
2439
2440 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2441 const char* option_type) {
2442 if (ignore) return false;
2443
2444 const char* spacer = " ";
2445 if (option_type == NULL) {
2446 option_type = ++spacer; // Set both to the empty string.
2447 }
2448
2449 if (os::obsolete_option(option)) {
2450 jio_fprintf(defaultStream::error_stream(),
2451 "Obsolete %s%soption: %s\n", option_type, spacer,
2452 option->optionString);
2453 return false;
2454 } else {
2455 jio_fprintf(defaultStream::error_stream(),
2456 "Unrecognized %s%soption: %s\n", option_type, spacer,
2457 option->optionString);
2458 return true;
2459 }
2460 }
2461
2462 static const char* user_assertion_options[] = {
2463 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2464 };
2465
2466 static const char* system_assertion_options[] = {
2467 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2468 };
2469
2470 // Return true if any of the strings in null-terminated array 'names' matches.
2471 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2472 // the option must match exactly.
2473 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2474 bool tail_allowed) {
2475 for (/* empty */; *names != NULL; ++names) {
2476 if (match_option(option, *names, tail)) {
2477 if (**tail == '\0' || tail_allowed && **tail == ':') {
2478 return true;
2479 }
2480 }
2481 }
2482 return false;
2483 }
2484
2485 bool Arguments::parse_uintx(const char* value,
2486 uintx* uintx_arg,
2487 uintx min_size) {
2488
2489 // Check the sign first since atomull() parses only unsigned values.
2490 bool value_is_positive = !(*value == '-');
2491
2492 if (value_is_positive) {
2493 julong n;
2494 bool good_return = atomull(value, &n);
2495 if (good_return) {
2496 bool above_minimum = n >= min_size;
2497 bool value_is_too_large = n > max_uintx;
2498
2499 if (above_minimum && !value_is_too_large) {
2500 *uintx_arg = n;
2501 return true;
2502 }
2503 }
2504 }
2505 return false;
2506 }
2507
2508 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2509 julong* long_arg,
2510 julong min_size) {
2511 if (!atomull(s, long_arg)) return arg_unreadable;
2512 return check_memory_size(*long_arg, min_size);
2513 }
2514
2515 // Parse JavaVMInitArgs structure
2516
2517 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2518 // For components of the system classpath.
2519 SysClassPath scp(Arguments::get_sysclasspath());
2520 bool scp_assembly_required = false;
2521
2522 // Save default settings for some mode flags
2523 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2524 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2525 Arguments::_ClipInlining = ClipInlining;
2526 Arguments::_BackgroundCompilation = BackgroundCompilation;
2527
2528 // Setup flags for mixed which is the default
2529 set_mode_flags(_mixed);
2530
2531 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2532 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2533 if (result != JNI_OK) {
2534 return result;
2535 }
2536
2537 // Parse JavaVMInitArgs structure passed in
2538 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2539 if (result != JNI_OK) {
2540 return result;
2541 }
2542
2543 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2544 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2545 if (result != JNI_OK) {
2546 return result;
2547 }
2548
2549 // Do final processing now that all arguments have been parsed
2550 result = finalize_vm_init_args(&scp, scp_assembly_required);
2551 if (result != JNI_OK) {
2552 return result;
2553 }
2554
2555 return JNI_OK;
2556 }
2557
2558 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2559 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2560 // are dealing with -agentpath (case where name is a path), otherwise with
2561 // -agentlib
2562 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2563 char *_name;
2564 const char *_hprof = "hprof", *_jdwp = "jdwp";
2565 size_t _len_hprof, _len_jdwp, _len_prefix;
2566
2567 if (is_path) {
2568 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2569 return false;
2570 }
2571
2572 _name++; // skip past last path separator
2573 _len_prefix = strlen(JNI_LIB_PREFIX);
2574
2575 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2576 return false;
2577 }
2578
2579 _name += _len_prefix;
2580 _len_hprof = strlen(_hprof);
2581 _len_jdwp = strlen(_jdwp);
2582
2583 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2584 _name += _len_hprof;
2585 }
2586 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2587 _name += _len_jdwp;
2588 }
2589 else {
2590 return false;
2591 }
2592
2593 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2594 return false;
2595 }
2596
2597 return true;
2598 }
2599
2600 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2601 return true;
2602 }
2603
2604 return false;
2605 }
2606
2607 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2608 SysClassPath* scp_p,
2609 bool* scp_assembly_required_p,
2610 Flag::Flags origin) {
2611 // Remaining part of option string
2612 const char* tail;
2613
2614 // iterate over arguments
2615 for (int index = 0; index < args->nOptions; index++) {
2616 bool is_absolute_path = false; // for -agentpath vs -agentlib
2617
2618 const JavaVMOption* option = args->options + index;
2619
2620 if (!match_option(option, "-Djava.class.path", &tail) &&
2621 !match_option(option, "-Dsun.java.command", &tail) &&
2622 !match_option(option, "-Dsun.java.launcher", &tail)) {
2623
2624 // add all jvm options to the jvm_args string. This string
2625 // is used later to set the java.vm.args PerfData string constant.
2626 // the -Djava.class.path and the -Dsun.java.command options are
2627 // omitted from jvm_args string as each have their own PerfData
2628 // string constant object.
2629 build_jvm_args(option->optionString);
2630 }
2631
2632 // -verbose:[class/gc/jni]
2633 if (match_option(option, "-verbose", &tail)) {
2634 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2635 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2636 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2637 } else if (!strcmp(tail, ":gc")) {
2638 FLAG_SET_CMDLINE(bool, PrintGC, true);
2639 } else if (!strcmp(tail, ":jni")) {
2640 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2641 }
2642 // -da / -ea / -disableassertions / -enableassertions
2643 // These accept an optional class/package name separated by a colon, e.g.,
2644 // -da:java.lang.Thread.
2645 } else if (match_option(option, user_assertion_options, &tail, true)) {
2646 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2647 if (*tail == '\0') {
2648 JavaAssertions::setUserClassDefault(enable);
2649 } else {
2650 assert(*tail == ':', "bogus match by match_option()");
2651 JavaAssertions::addOption(tail + 1, enable);
2652 }
2653 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2654 } else if (match_option(option, system_assertion_options, &tail, false)) {
2655 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2656 JavaAssertions::setSystemClassDefault(enable);
2657 // -bootclasspath:
2658 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2659 scp_p->reset_path(tail);
2660 *scp_assembly_required_p = true;
2661 // -bootclasspath/a:
2662 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2663 scp_p->add_suffix(tail);
2664 *scp_assembly_required_p = true;
2665 // -bootclasspath/p:
2666 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2667 scp_p->add_prefix(tail);
2668 *scp_assembly_required_p = true;
2669 // -Xrun
2670 } else if (match_option(option, "-Xrun", &tail)) {
2671 if (tail != NULL) {
2672 const char* pos = strchr(tail, ':');
2673 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2674 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2675 name[len] = '\0';
2676
2677 char *options = NULL;
2678 if(pos != NULL) {
2679 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2680 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2681 }
2682 #if !INCLUDE_JVMTI
2683 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2684 jio_fprintf(defaultStream::error_stream(),
2685 "Profiling and debugging agents are not supported in this VM\n");
2686 return JNI_ERR;
2687 }
2688 #endif // !INCLUDE_JVMTI
2689 add_init_library(name, options);
2690 }
2691 // -agentlib and -agentpath
2692 } else if (match_option(option, "-agentlib:", &tail) ||
2693 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2694 if(tail != NULL) {
2695 const char* pos = strchr(tail, '=');
2696 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2697 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2698 name[len] = '\0';
2699
2700 char *options = NULL;
2701 if(pos != NULL) {
2702 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2703 }
2704 #if !INCLUDE_JVMTI
2705 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2706 jio_fprintf(defaultStream::error_stream(),
2707 "Profiling and debugging agents are not supported in this VM\n");
2708 return JNI_ERR;
2709 }
2710 #endif // !INCLUDE_JVMTI
2711 add_init_agent(name, options, is_absolute_path);
2712 }
2713 // -javaagent
2714 } else if (match_option(option, "-javaagent:", &tail)) {
2715 #if !INCLUDE_JVMTI
2716 jio_fprintf(defaultStream::error_stream(),
2717 "Instrumentation agents are not supported in this VM\n");
2718 return JNI_ERR;
2719 #else
2720 if(tail != NULL) {
2721 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2722 add_init_agent("instrument", options, false);
2723 }
2724 #endif // !INCLUDE_JVMTI
2725 // -Xnoclassgc
2726 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2727 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2728 // -Xincgc: i-CMS
2729 } else if (match_option(option, "-Xincgc", &tail)) {
2730 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2731 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2732 // -Xnoincgc: no i-CMS
2733 } else if (match_option(option, "-Xnoincgc", &tail)) {
2734 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2735 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2736 // -Xconcgc
2737 } else if (match_option(option, "-Xconcgc", &tail)) {
2738 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2739 // -Xnoconcgc
2740 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2741 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2742 // -Xbatch
2743 } else if (match_option(option, "-Xbatch", &tail)) {
2744 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2745 // -Xmn for compatibility with other JVM vendors
2746 } else if (match_option(option, "-Xmn", &tail)) {
2747 julong long_initial_young_size = 0;
2748 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2749 if (errcode != arg_in_range) {
2750 jio_fprintf(defaultStream::error_stream(),
2751 "Invalid initial young generation size: %s\n", option->optionString);
2752 describe_range_error(errcode);
2753 return JNI_EINVAL;
2754 }
2755 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2756 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2757 // -Xms
2758 } else if (match_option(option, "-Xms", &tail)) {
2759 julong long_initial_heap_size = 0;
2760 // an initial heap size of 0 means automatically determine
2761 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2762 if (errcode != arg_in_range) {
2763 jio_fprintf(defaultStream::error_stream(),
2764 "Invalid initial heap size: %s\n", option->optionString);
2765 describe_range_error(errcode);
2766 return JNI_EINVAL;
2767 }
2768 set_min_heap_size((uintx)long_initial_heap_size);
2769 // Currently the minimum size and the initial heap sizes are the same.
2770 // Can be overridden with -XX:InitialHeapSize.
2771 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2772 // -Xmx
2773 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2774 julong long_max_heap_size = 0;
2775 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2776 if (errcode != arg_in_range) {
2777 jio_fprintf(defaultStream::error_stream(),
2778 "Invalid maximum heap size: %s\n", option->optionString);
2779 describe_range_error(errcode);
2780 return JNI_EINVAL;
2781 }
2782 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2783 // Xmaxf
2784 } else if (match_option(option, "-Xmaxf", &tail)) {
2785 char* err;
2786 int maxf = (int)(strtod(tail, &err) * 100);
2787 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2788 jio_fprintf(defaultStream::error_stream(),
2789 "Bad max heap free percentage size: %s\n",
2790 option->optionString);
2791 return JNI_EINVAL;
2792 } else {
2793 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2794 }
2795 // Xminf
2796 } else if (match_option(option, "-Xminf", &tail)) {
2797 char* err;
2798 int minf = (int)(strtod(tail, &err) * 100);
2799 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2800 jio_fprintf(defaultStream::error_stream(),
2801 "Bad min heap free percentage size: %s\n",
2802 option->optionString);
2803 return JNI_EINVAL;
2804 } else {
2805 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2806 }
2807 // -Xss
2808 } else if (match_option(option, "-Xss", &tail)) {
2809 julong long_ThreadStackSize = 0;
2810 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2811 if (errcode != arg_in_range) {
2812 jio_fprintf(defaultStream::error_stream(),
2813 "Invalid thread stack size: %s\n", option->optionString);
2814 describe_range_error(errcode);
2815 return JNI_EINVAL;
2816 }
2817 // Internally track ThreadStackSize in units of 1024 bytes.
2818 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2819 round_to((int)long_ThreadStackSize, K) / K);
2820 // -Xoss
2821 } else if (match_option(option, "-Xoss", &tail)) {
2822 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2823 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2824 julong long_CodeCacheExpansionSize = 0;
2825 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2826 if (errcode != arg_in_range) {
2827 jio_fprintf(defaultStream::error_stream(),
2828 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2829 os::vm_page_size()/K);
2830 return JNI_EINVAL;
2831 }
2832 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2833 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2834 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2835 julong long_ReservedCodeCacheSize = 0;
2836
2837 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2838 if (errcode != arg_in_range) {
2839 jio_fprintf(defaultStream::error_stream(),
2840 "Invalid maximum code cache size: %s.\n", option->optionString);
2841 return JNI_EINVAL;
2842 }
2843 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2844 //-XX:IncreaseFirstTierCompileThresholdAt=
2845 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2846 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2847 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2848 jio_fprintf(defaultStream::error_stream(),
2849 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2850 option->optionString);
2851 return JNI_EINVAL;
2852 }
2853 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2854 // -green
2855 } else if (match_option(option, "-green", &tail)) {
2856 jio_fprintf(defaultStream::error_stream(),
2857 "Green threads support not available\n");
2858 return JNI_EINVAL;
2859 // -native
2860 } else if (match_option(option, "-native", &tail)) {
2861 // HotSpot always uses native threads, ignore silently for compatibility
2862 // -Xsqnopause
2863 } else if (match_option(option, "-Xsqnopause", &tail)) {
2864 // EVM option, ignore silently for compatibility
2865 // -Xrs
2866 } else if (match_option(option, "-Xrs", &tail)) {
2867 // Classic/EVM option, new functionality
2868 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2869 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2870 // change default internal VM signals used - lower case for back compat
2871 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2872 // -Xoptimize
2873 } else if (match_option(option, "-Xoptimize", &tail)) {
2874 // EVM option, ignore silently for compatibility
2875 // -Xprof
2876 } else if (match_option(option, "-Xprof", &tail)) {
2877 #if INCLUDE_FPROF
2878 _has_profile = true;
2879 #else // INCLUDE_FPROF
2880 jio_fprintf(defaultStream::error_stream(),
2881 "Flat profiling is not supported in this VM.\n");
2882 return JNI_ERR;
2883 #endif // INCLUDE_FPROF
2884 // -Xconcurrentio
2885 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2886 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2887 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2888 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2889 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2890 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2891
2892 // -Xinternalversion
2893 } else if (match_option(option, "-Xinternalversion", &tail)) {
2894 jio_fprintf(defaultStream::output_stream(), "%s\n",
2895 VM_Version::internal_vm_info_string());
2896 vm_exit(0);
2897 #ifndef PRODUCT
2898 // -Xprintflags
2899 } else if (match_option(option, "-Xprintflags", &tail)) {
2900 CommandLineFlags::printFlags(tty, false);
2901 vm_exit(0);
2902 #endif
2903 // -D
2904 } else if (match_option(option, "-D", &tail)) {
2905 if (!add_property(tail)) {
2906 return JNI_ENOMEM;
2907 }
2908 // Out of the box management support
2909 if (match_option(option, "-Dcom.sun.management", &tail)) {
2910 #if INCLUDE_MANAGEMENT
2911 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2912 #else
2913 jio_fprintf(defaultStream::output_stream(),
2914 "-Dcom.sun.management is not supported in this VM.\n");
2915 return JNI_ERR;
2916 #endif
2917 }
2918 // -Xint
2919 } else if (match_option(option, "-Xint", &tail)) {
2920 set_mode_flags(_int);
2921 // -Xmixed
2922 } else if (match_option(option, "-Xmixed", &tail)) {
2923 set_mode_flags(_mixed);
2924 // -Xcomp
2925 } else if (match_option(option, "-Xcomp", &tail)) {
2926 // for testing the compiler; turn off all flags that inhibit compilation
2927 set_mode_flags(_comp);
2928 // -Xshare:dump
2929 } else if (match_option(option, "-Xshare:dump", &tail)) {
2930 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2931 set_mode_flags(_int); // Prevent compilation, which creates objects
2932 // -Xshare:on
2933 } else if (match_option(option, "-Xshare:on", &tail)) {
2934 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2935 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2936 // -Xshare:auto
2937 } else if (match_option(option, "-Xshare:auto", &tail)) {
2938 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2939 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2940 // -Xshare:off
2941 } else if (match_option(option, "-Xshare:off", &tail)) {
2942 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2943 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2944 // -Xverify
2945 } else if (match_option(option, "-Xverify", &tail)) {
2946 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2947 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2948 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2949 } else if (strcmp(tail, ":remote") == 0) {
2950 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2951 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2952 } else if (strcmp(tail, ":none") == 0) {
2953 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2954 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2955 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2956 return JNI_EINVAL;
2957 }
2958 // -Xdebug
2959 } else if (match_option(option, "-Xdebug", &tail)) {
2960 // note this flag has been used, then ignore
2961 set_xdebug_mode(true);
2962 // -Xnoagent
2963 } else if (match_option(option, "-Xnoagent", &tail)) {
2964 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2965 } else if (match_option(option, "-Xboundthreads", &tail)) {
2966 // Bind user level threads to kernel threads (Solaris only)
2967 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2968 } else if (match_option(option, "-Xloggc:", &tail)) {
2969 // Redirect GC output to the file. -Xloggc:<filename>
2970 // ostream_init_log(), when called will use this filename
2971 // to initialize a fileStream.
2972 _gc_log_filename = strdup(tail);
2973 if (!is_filename_valid(_gc_log_filename)) {
2974 jio_fprintf(defaultStream::output_stream(),
2975 "Invalid file name for use with -Xloggc: Filename can only contain the "
2976 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2977 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2978 return JNI_EINVAL;
2979 }
2980 FLAG_SET_CMDLINE(bool, PrintGC, true);
2981 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2982
2983 // JNI hooks
2984 } else if (match_option(option, "-Xcheck", &tail)) {
2985 if (!strcmp(tail, ":jni")) {
2986 #if !INCLUDE_JNI_CHECK
2987 warning("JNI CHECKING is not supported in this VM");
2988 #else
2989 CheckJNICalls = true;
2990 #endif // INCLUDE_JNI_CHECK
2991 } else if (is_bad_option(option, args->ignoreUnrecognized,
2992 "check")) {
2993 return JNI_EINVAL;
2994 }
2995 } else if (match_option(option, "vfprintf", &tail)) {
2996 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2997 } else if (match_option(option, "exit", &tail)) {
2998 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2999 } else if (match_option(option, "abort", &tail)) {
3000 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3001 // -XX:+AggressiveHeap
3002 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3003
3004 // This option inspects the machine and attempts to set various
3005 // parameters to be optimal for long-running, memory allocation
3006 // intensive jobs. It is intended for machines with large
3007 // amounts of cpu and memory.
3008
3009 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3010 // VM, but we may not be able to represent the total physical memory
3011 // available (like having 8gb of memory on a box but using a 32bit VM).
3012 // Thus, we need to make sure we're using a julong for intermediate
3013 // calculations.
3014 julong initHeapSize;
3015 julong total_memory = os::physical_memory();
3016
3017 if (total_memory < (julong)256*M) {
3018 jio_fprintf(defaultStream::error_stream(),
3019 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3020 vm_exit(1);
3021 }
3022
3023 // The heap size is half of available memory, or (at most)
3024 // all of possible memory less 160mb (leaving room for the OS
3025 // when using ISM). This is the maximum; because adaptive sizing
3026 // is turned on below, the actual space used may be smaller.
3027
3028 initHeapSize = MIN2(total_memory / (julong)2,
3029 total_memory - (julong)160*M);
3030
3031 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3032
3033 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3034 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3035 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3036 // Currently the minimum size and the initial heap sizes are the same.
3037 set_min_heap_size(initHeapSize);
3038 }
3039 if (FLAG_IS_DEFAULT(NewSize)) {
3040 // Make the young generation 3/8ths of the total heap.
3041 FLAG_SET_CMDLINE(uintx, NewSize,
3042 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3043 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3044 }
3045
3046 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3047 FLAG_SET_DEFAULT(UseLargePages, true);
3048 #endif
3049
3050 // Increase some data structure sizes for efficiency
3051 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3052 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3053 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3054
3055 // See the OldPLABSize comment below, but replace 'after promotion'
3056 // with 'after copying'. YoungPLABSize is the size of the survivor
3057 // space per-gc-thread buffers. The default is 4kw.
3058 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3059
3060 // OldPLABSize is the size of the buffers in the old gen that
3061 // UseParallelGC uses to promote live data that doesn't fit in the
3062 // survivor spaces. At any given time, there's one for each gc thread.
3063 // The default size is 1kw. These buffers are rarely used, since the
3064 // survivor spaces are usually big enough. For specjbb, however, there
3065 // are occasions when there's lots of live data in the young gen
3066 // and we end up promoting some of it. We don't have a definite
3067 // explanation for why bumping OldPLABSize helps, but the theory
3068 // is that a bigger PLAB results in retaining something like the
3069 // original allocation order after promotion, which improves mutator
3070 // locality. A minor effect may be that larger PLABs reduce the
3071 // number of PLAB allocation events during gc. The value of 8kw
3072 // was arrived at by experimenting with specjbb.
3073 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3074
3075 // Enable parallel GC and adaptive generation sizing
3076 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3077 FLAG_SET_DEFAULT(ParallelGCThreads,
3078 Abstract_VM_Version::parallel_worker_threads());
3079
3080 // Encourage steady state memory management
3081 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3082
3083 // This appears to improve mutator locality
3084 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3085
3086 // Get around early Solaris scheduling bug
3087 // (affinity vs other jobs on system)
3088 // but disallow DR and offlining (5008695).
3089 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3090
3091 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3092 // and the last option wins.
3093 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3094 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3095 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3096 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3097 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3098 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3099 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3100 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3101 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3102 uintx max_tenuring_thresh = 0;
3103 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3104 jio_fprintf(defaultStream::error_stream(),
3105 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3106 }
3107 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3108
3109 if (MaxTenuringThreshold == 0) {
3110 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3111 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3112 } else {
3113 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3114 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3115 }
3116 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3117 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3118 jio_fprintf(defaultStream::error_stream(),
3119 "Please use CMSClassUnloadingEnabled in place of "
3120 "CMSPermGenSweepingEnabled in the future\n");
3121 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3122 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3123 jio_fprintf(defaultStream::error_stream(),
3124 "Please use -XX:+UseGCOverheadLimit in place of "
3125 "-XX:+UseGCTimeLimit in the future\n");
3126 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3127 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3128 jio_fprintf(defaultStream::error_stream(),
3129 "Please use -XX:-UseGCOverheadLimit in place of "
3130 "-XX:-UseGCTimeLimit in the future\n");
3131 // The TLE options are for compatibility with 1.3 and will be
3132 // removed without notice in a future release. These options
3133 // are not to be documented.
3134 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3135 // No longer used.
3136 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3137 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3138 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3139 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3140 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3141 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3142 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3143 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3144 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3145 // No longer used.
3146 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3147 julong long_tlab_size = 0;
3148 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3149 if (errcode != arg_in_range) {
3150 jio_fprintf(defaultStream::error_stream(),
3151 "Invalid TLAB size: %s\n", option->optionString);
3152 describe_range_error(errcode);
3153 return JNI_EINVAL;
3154 }
3155 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3156 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3157 // No longer used.
3158 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3159 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3160 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3161 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3162 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3163 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3164 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3165 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3166 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3167 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3168 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3169 #if defined(DTRACE_ENABLED)
3170 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3171 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3172 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3173 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3174 #else // defined(DTRACE_ENABLED)
3175 jio_fprintf(defaultStream::error_stream(),
3176 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3177 return JNI_EINVAL;
3178 #endif // defined(DTRACE_ENABLED)
3179 #ifdef ASSERT
3180 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3181 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3182 // disable scavenge before parallel mark-compact
3183 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3184 #endif
3185 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3186 julong cms_blocks_to_claim = (julong)atol(tail);
3187 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3188 jio_fprintf(defaultStream::error_stream(),
3189 "Please use -XX:OldPLABSize in place of "
3190 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3191 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3192 julong cms_blocks_to_claim = (julong)atol(tail);
3193 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3194 jio_fprintf(defaultStream::error_stream(),
3195 "Please use -XX:OldPLABSize in place of "
3196 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3197 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3198 julong old_plab_size = 0;
3199 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3200 if (errcode != arg_in_range) {
3201 jio_fprintf(defaultStream::error_stream(),
3202 "Invalid old PLAB size: %s\n", option->optionString);
3203 describe_range_error(errcode);
3204 return JNI_EINVAL;
3205 }
3206 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3207 jio_fprintf(defaultStream::error_stream(),
3208 "Please use -XX:OldPLABSize in place of "
3209 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3210 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3211 julong young_plab_size = 0;
3212 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3213 if (errcode != arg_in_range) {
3214 jio_fprintf(defaultStream::error_stream(),
3215 "Invalid young PLAB size: %s\n", option->optionString);
3216 describe_range_error(errcode);
3217 return JNI_EINVAL;
3218 }
3219 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3220 jio_fprintf(defaultStream::error_stream(),
3221 "Please use -XX:YoungPLABSize in place of "
3222 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3223 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3224 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3225 julong stack_size = 0;
3226 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3227 if (errcode != arg_in_range) {
3228 jio_fprintf(defaultStream::error_stream(),
3229 "Invalid mark stack size: %s\n", option->optionString);
3230 describe_range_error(errcode);
3231 return JNI_EINVAL;
3232 }
3233 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3234 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3235 julong max_stack_size = 0;
3236 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3237 if (errcode != arg_in_range) {
3238 jio_fprintf(defaultStream::error_stream(),
3239 "Invalid maximum mark stack size: %s\n",
3240 option->optionString);
3241 describe_range_error(errcode);
3242 return JNI_EINVAL;
3243 }
3244 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3245 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3246 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3247 uintx conc_threads = 0;
3248 if (!parse_uintx(tail, &conc_threads, 1)) {
3249 jio_fprintf(defaultStream::error_stream(),
3250 "Invalid concurrent threads: %s\n", option->optionString);
3251 return JNI_EINVAL;
3252 }
3253 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3254 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3255 julong max_direct_memory_size = 0;
3256 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3257 if (errcode != arg_in_range) {
3258 jio_fprintf(defaultStream::error_stream(),
3259 "Invalid maximum direct memory size: %s\n",
3260 option->optionString);
3261 describe_range_error(errcode);
3262 return JNI_EINVAL;
3263 }
3264 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3265 #if !INCLUDE_MANAGEMENT
3266 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3267 jio_fprintf(defaultStream::error_stream(),
3268 "ManagementServer is not supported in this VM.\n");
3269 return JNI_ERR;
3270 #endif // INCLUDE_MANAGEMENT
3271 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3272 // Skip -XX:Flags= since that case has already been handled
3273 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3274 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3275 return JNI_EINVAL;
3276 }
3277 }
3278 // Unknown option
3279 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3280 return JNI_ERR;
3281 }
3282 }
3283
3284 // Change the default value for flags which have different default values
3285 // when working with older JDKs.
3286 #ifdef LINUX
3287 if (JDK_Version::current().compare_major(6) <= 0 &&
3288 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3289 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3290 }
3291 #endif // LINUX
3292 return JNI_OK;
3293 }
3294
3295 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3296 // This must be done after all -D arguments have been processed.
3297 scp_p->expand_endorsed();
3298
3299 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3300 // Assemble the bootclasspath elements into the final path.
3301 Arguments::set_sysclasspath(scp_p->combined_path());
3302 }
3303
3304 // This must be done after all arguments have been processed.
3305 // java_compiler() true means set to "NONE" or empty.
3306 if (java_compiler() && !xdebug_mode()) {
3307 // For backwards compatibility, we switch to interpreted mode if
3308 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3309 // not specified.
3310 set_mode_flags(_int);
3311 }
3312 if (CompileThreshold == 0) {
3313 set_mode_flags(_int);
3314 }
3315
3316 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3317 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3318 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3319 }
3320
3321 #ifndef COMPILER2
3322 // Don't degrade server performance for footprint
3323 if (FLAG_IS_DEFAULT(UseLargePages) &&
3324 MaxHeapSize < LargePageHeapSizeThreshold) {
3325 // No need for large granularity pages w/small heaps.
3326 // Note that large pages are enabled/disabled for both the
3327 // Java heap and the code cache.
3328 FLAG_SET_DEFAULT(UseLargePages, false);
3329 }
3330
3331 #else
3332 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3333 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3334 }
3335 #endif
3336
3337 #ifndef TIERED
3338 // Tiered compilation is undefined.
3339 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3340 #endif
3341
3342 // If we are running in a headless jre, force java.awt.headless property
3343 // to be true unless the property has already been set.
3344 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3345 if (os::is_headless_jre()) {
3346 const char* headless = Arguments::get_property("java.awt.headless");
3347 if (headless == NULL) {
3348 char envbuffer[128];
3349 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3350 if (!add_property("java.awt.headless=true")) {
3351 return JNI_ENOMEM;
3352 }
3353 } else {
3354 char buffer[256];
3355 strcpy(buffer, "java.awt.headless=");
3356 strcat(buffer, envbuffer);
3357 if (!add_property(buffer)) {
3358 return JNI_ENOMEM;
3359 }
3360 }
3361 }
3362 }
3363
3364 if (!check_vm_args_consistency()) {
3365 return JNI_ERR;
3366 }
3367
3368 return JNI_OK;
3369 }
3370
3371 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3372 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3373 scp_assembly_required_p);
3374 }
3375
3376 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3377 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3378 scp_assembly_required_p);
3379 }
3380
3381 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3382 const int N_MAX_OPTIONS = 64;
3383 const int OPTION_BUFFER_SIZE = 1024;
3384 char buffer[OPTION_BUFFER_SIZE];
3385
3386 // The variable will be ignored if it exceeds the length of the buffer.
3387 // Don't check this variable if user has special privileges
3388 // (e.g. unix su command).
3389 if (os::getenv(name, buffer, sizeof(buffer)) &&
3390 !os::have_special_privileges()) {
3391 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3392 jio_fprintf(defaultStream::error_stream(),
3393 "Picked up %s: %s\n", name, buffer);
3394 char* rd = buffer; // pointer to the input string (rd)
3395 int i;
3396 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3397 while (isspace(*rd)) rd++; // skip whitespace
3398 if (*rd == 0) break; // we re done when the input string is read completely
3399
3400 // The output, option string, overwrites the input string.
3401 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3402 // input string (rd).
3403 char* wrt = rd;
3404
3405 options[i++].optionString = wrt; // Fill in option
3406 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3407 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3408 int quote = *rd; // matching quote to look for
3409 rd++; // don't copy open quote
3410 while (*rd != quote) { // include everything (even spaces) up until quote
3411 if (*rd == 0) { // string termination means unmatched string
3412 jio_fprintf(defaultStream::error_stream(),
3413 "Unmatched quote in %s\n", name);
3414 return JNI_ERR;
3415 }
3416 *wrt++ = *rd++; // copy to option string
3417 }
3418 rd++; // don't copy close quote
3419 } else {
3420 *wrt++ = *rd++; // copy to option string
3421 }
3422 }
3423 // Need to check if we're done before writing a NULL,
3424 // because the write could be to the byte that rd is pointing to.
3425 if (*rd++ == 0) {
3426 *wrt = 0;
3427 break;
3428 }
3429 *wrt = 0; // Zero terminate option
3430 }
3431 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3432 JavaVMInitArgs vm_args;
3433 vm_args.version = JNI_VERSION_1_2;
3434 vm_args.options = options;
3435 vm_args.nOptions = i;
3436 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3437
3438 if (PrintVMOptions) {
3439 const char* tail;
3440 for (int i = 0; i < vm_args.nOptions; i++) {
3441 const JavaVMOption *option = vm_args.options + i;
3442 if (match_option(option, "-XX:", &tail)) {
3443 logOption(tail);
3444 }
3445 }
3446 }
3447
3448 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3449 }
3450 return JNI_OK;
3451 }
3452
3453 void Arguments::set_shared_spaces_flags() {
3454 if (DumpSharedSpaces) {
3455 if (RequireSharedSpaces) {
3456 warning("cannot dump shared archive while using shared archive");
3457 }
3458 UseSharedSpaces = false;
3459 #ifdef _LP64
3460 if (!UseCompressedOops || !UseCompressedClassPointers) {
3461 vm_exit_during_initialization(
3462 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3463 }
3464 } else {
3465 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3466 if (!UseCompressedOops || !UseCompressedClassPointers) {
3467 no_shared_spaces();
3468 }
3469 #endif
3470 }
3471 }
3472
3473 #if !INCLUDE_ALL_GCS
3474 static void force_serial_gc() {
3475 FLAG_SET_DEFAULT(UseSerialGC, true);
3476 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3477 UNSUPPORTED_GC_OPTION(UseG1GC);
3478 UNSUPPORTED_GC_OPTION(UseParallelGC);
3479 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3480 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3481 UNSUPPORTED_GC_OPTION(UseParNewGC);
3482 }
3483 #endif // INCLUDE_ALL_GCS
3484
3485 // Sharing support
3486 // Construct the path to the archive
3487 static char* get_shared_archive_path() {
3488 char *shared_archive_path;
3489 if (SharedArchiveFile == NULL) {
3490 char jvm_path[JVM_MAXPATHLEN];
3491 os::jvm_path(jvm_path, sizeof(jvm_path));
3492 char *end = strrchr(jvm_path, *os::file_separator());
3493 if (end != NULL) *end = '\0';
3494 size_t jvm_path_len = strlen(jvm_path);
3495 size_t file_sep_len = strlen(os::file_separator());
3496 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3497 file_sep_len + 20, mtInternal);
3498 if (shared_archive_path != NULL) {
3499 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3500 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3501 strncat(shared_archive_path, "classes.jsa", 11);
3502 }
3503 } else {
3504 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3505 if (shared_archive_path != NULL) {
3506 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3507 }
3508 }
3509 return shared_archive_path;
3510 }
3511
3512 #ifndef PRODUCT
3513 // Determine whether LogVMOutput should be implicitly turned on.
3514 static bool use_vm_log() {
3515 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3516 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3517 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3518 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3519 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3520 return true;
3521 }
3522
3523 #ifdef COMPILER1
3524 if (PrintC1Statistics) {
3525 return true;
3526 }
3527 #endif // COMPILER1
3528
3529 #ifdef COMPILER2
3530 if (PrintOptoAssembly || PrintOptoStatistics) {
3531 return true;
3532 }
3533 #endif // COMPILER2
3534
3535 return false;
3536 }
3537 #endif // PRODUCT
3538
3539 // Parse entry point called from JNI_CreateJavaVM
3540
3541 jint Arguments::parse(const JavaVMInitArgs* args) {
3542
3543 // Remaining part of option string
3544 const char* tail;
3545
3546 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3547 const char* hotspotrc = ".hotspotrc";
3548 bool settings_file_specified = false;
3549 bool needs_hotspotrc_warning = false;
3550
3551 const char* flags_file;
3552 int index;
3553 for (index = 0; index < args->nOptions; index++) {
3554 const JavaVMOption *option = args->options + index;
3555 if (match_option(option, "-XX:Flags=", &tail)) {
3556 flags_file = tail;
3557 settings_file_specified = true;
3558 }
3559 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3560 PrintVMOptions = true;
3561 }
3562 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3563 PrintVMOptions = false;
3564 }
3565 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3566 IgnoreUnrecognizedVMOptions = true;
3567 }
3568 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3569 IgnoreUnrecognizedVMOptions = false;
3570 }
3571 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3572 CommandLineFlags::printFlags(tty, false);
3573 vm_exit(0);
3574 }
3575 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3576 #if INCLUDE_NMT
3577 MemTracker::init_tracking_options(tail);
3578 #else
3579 jio_fprintf(defaultStream::error_stream(),
3580 "Native Memory Tracking is not supported in this VM\n");
3581 return JNI_ERR;
3582 #endif
3583 }
3584
3585
3586 #ifndef PRODUCT
3587 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3588 CommandLineFlags::printFlags(tty, true);
3589 vm_exit(0);
3590 }
3591 #endif
3592 }
3593
3594 if (IgnoreUnrecognizedVMOptions) {
3595 // uncast const to modify the flag args->ignoreUnrecognized
3596 *(jboolean*)(&args->ignoreUnrecognized) = true;
3597 }
3598
3599 // Parse specified settings file
3600 if (settings_file_specified) {
3601 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3602 return JNI_EINVAL;
3603 }
3604 } else {
3605 #ifdef ASSERT
3606 // Parse default .hotspotrc settings file
3607 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3608 return JNI_EINVAL;
3609 }
3610 #else
3611 struct stat buf;
3612 if (os::stat(hotspotrc, &buf) == 0) {
3613 needs_hotspotrc_warning = true;
3614 }
3615 #endif
3616 }
3617
3618 if (PrintVMOptions) {
3619 for (index = 0; index < args->nOptions; index++) {
3620 const JavaVMOption *option = args->options + index;
3621 if (match_option(option, "-XX:", &tail)) {
3622 logOption(tail);
3623 }
3624 }
3625 }
3626
3627 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3628 jint result = parse_vm_init_args(args);
3629 if (result != JNI_OK) {
3630 return result;
3631 }
3632
3633 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3634 SharedArchivePath = get_shared_archive_path();
3635 if (SharedArchivePath == NULL) {
3636 return JNI_ENOMEM;
3637 }
3638
3639 // Delay warning until here so that we've had a chance to process
3640 // the -XX:-PrintWarnings flag
3641 if (needs_hotspotrc_warning) {
3642 warning("%s file is present but has been ignored. "
3643 "Run with -XX:Flags=%s to load the file.",
3644 hotspotrc, hotspotrc);
3645 }
3646
3647 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3648 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3649 #endif
3650
3651 #if INCLUDE_ALL_GCS
3652 #if (defined JAVASE_EMBEDDED || defined ARM)
3653 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3654 #endif
3655 #endif
3656
3657 #ifndef PRODUCT
3658 if (TraceBytecodesAt != 0) {
3659 TraceBytecodes = true;
3660 }
3661 if (CountCompiledCalls) {
3662 if (UseCounterDecay) {
3663 warning("UseCounterDecay disabled because CountCalls is set");
3664 UseCounterDecay = false;
3665 }
3666 }
3667 #endif // PRODUCT
3668
3669 if (ScavengeRootsInCode == 0) {
3670 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3671 warning("forcing ScavengeRootsInCode non-zero");
3672 }
3673 ScavengeRootsInCode = 1;
3674 }
3675
3676 if (PrintGCDetails) {
3677 // Turn on -verbose:gc options as well
3678 PrintGC = true;
3679 }
3680
3681 if (!JDK_Version::is_gte_jdk18x_version()) {
3682 // To avoid changing the log format for 7 updates this flag is only
3683 // true by default in JDK8 and above.
3684 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3685 FLAG_SET_DEFAULT(PrintGCCause, false);
3686 }
3687 }
3688
3689 // Set object alignment values.
3690 set_object_alignment();
3691
3692 #if !INCLUDE_ALL_GCS
3693 force_serial_gc();
3694 #endif // INCLUDE_ALL_GCS
3695 #if !INCLUDE_CDS
3696 if (DumpSharedSpaces || RequireSharedSpaces) {
3697 jio_fprintf(defaultStream::error_stream(),
3698 "Shared spaces are not supported in this VM\n");
3699 return JNI_ERR;
3700 }
3701 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3702 warning("Shared spaces are not supported in this VM");
3703 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3704 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3705 }
3706 no_shared_spaces();
3707 #endif // INCLUDE_CDS
3708
3709 return JNI_OK;
3710 }
3711
3712 jint Arguments::apply_ergo() {
3713
3714 // Set flags based on ergonomics.
3715 set_ergonomics_flags();
3716
3717 set_shared_spaces_flags();
3718
3719 // Check the GC selections again.
3720 if (!check_gc_consistency()) {
3721 return JNI_EINVAL;
3722 }
3723
3724 if (TieredCompilation) {
3725 set_tiered_flags();
3726 } else {
3727 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3728 if (CompilationPolicyChoice >= 2) {
3729 vm_exit_during_initialization(
3730 "Incompatible compilation policy selected", NULL);
3731 }
3732 }
3733 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3734 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3735 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3736 }
3737
3738
3739 // Set heap size based on available physical memory
3740 set_heap_size();
3741
3742 #if INCLUDE_ALL_GCS
3743 // Set per-collector flags
3744 if (UseParallelGC || UseParallelOldGC) {
3745 set_parallel_gc_flags();
3746 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
3747 set_cms_and_parnew_gc_flags();
3748 } else if (UseParNewGC) { // Skipped if CMS is set above
3749 set_parnew_gc_flags();
3750 } else if (UseG1GC) {
3751 set_g1_gc_flags();
3752 }
3753 check_deprecated_gcs();
3754 check_deprecated_gc_flags();
3755 if (AssumeMP && !UseSerialGC) {
3756 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3757 warning("If the number of processors is expected to increase from one, then"
3758 " you should configure the number of parallel GC threads appropriately"
3759 " using -XX:ParallelGCThreads=N");
3760 }
3761 }
3762 if (MinHeapFreeRatio == 100) {
3763 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
3764 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
3765 }
3766 #else // INCLUDE_ALL_GCS
3767 assert(verify_serial_gc_flags(), "SerialGC unset");
3768 #endif // INCLUDE_ALL_GCS
3769
3770 // Initialize Metaspace flags and alignments
3771 Metaspace::ergo_initialize();
3772
3773 // Set bytecode rewriting flags
3774 set_bytecode_flags();
3775
3776 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3777 set_aggressive_opts_flags();
3778
3779 // Turn off biased locking for locking debug mode flags,
3780 // which are subtly different from each other but neither works with
3781 // biased locking
3782 if (UseHeavyMonitors
3783 #ifdef COMPILER1
3784 || !UseFastLocking
3785 #endif // COMPILER1
3786 ) {
3787 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3788 // flag set to true on command line; warn the user that they
3789 // can't enable biased locking here
3790 warning("Biased Locking is not supported with locking debug flags"
3791 "; ignoring UseBiasedLocking flag." );
3792 }
3793 UseBiasedLocking = false;
3794 }
3795
3796 #ifdef ZERO
3797 // Clear flags not supported on zero.
3798 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3799 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3800 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3801 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3802 #endif // CC_INTERP
3803
3804 #ifdef COMPILER2
3805 if (!EliminateLocks) {
3806 EliminateNestedLocks = false;
3807 }
3808 if (!Inline) {
3809 IncrementalInline = false;
3810 }
3811 #ifndef PRODUCT
3812 if (!IncrementalInline) {
3813 AlwaysIncrementalInline = false;
3814 }
3815 #endif
3816 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3817 // nothing to use the profiling, turn if off
3818 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3819 }
3820 if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) {
3821 // Doing the replace in parent maps helps speculation
3822 FLAG_SET_DEFAULT(ReplaceInParentMaps, true);
3823 }
3824 #endif
3825
3826 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3827 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3828 DebugNonSafepoints = true;
3829 }
3830
3831 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3832 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3833 }
3834
3835 #ifndef PRODUCT
3836 if (CompileTheWorld) {
3837 // Force NmethodSweeper to sweep whole CodeCache each time.
3838 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3839 NmethodSweepFraction = 1;
3840 }
3841 }
3842
3843 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3844 if (use_vm_log()) {
3845 LogVMOutput = true;
3846 }
3847 }
3848 #endif // PRODUCT
3849
3850 if (PrintCommandLineFlags) {
3851 CommandLineFlags::printSetFlags(tty);
3852 }
3853
3854 // Apply CPU specific policy for the BiasedLocking
3855 if (UseBiasedLocking) {
3856 if (!VM_Version::use_biased_locking() &&
3857 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3858 UseBiasedLocking = false;
3859 }
3860 }
3861 #ifdef COMPILER2
3862 if (!UseBiasedLocking || EmitSync != 0) {
3863 UseOptoBiasInlining = false;
3864 }
3865 #endif
3866
3867 return JNI_OK;
3868 }
3869
3870 jint Arguments::adjust_after_os() {
3871 if (UseNUMA) {
3872 if (UseParallelGC || UseParallelOldGC) {
3873 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3874 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3875 }
3876 }
3877 // UseNUMAInterleaving is set to ON for all collectors and
3878 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3879 // such as the parallel collector for Linux and Solaris will
3880 // interleave old gen and survivor spaces on top of NUMA
3881 // allocation policy for the eden space.
3882 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3883 // all platforms and ParallelGC on Windows will interleave all
3884 // of the heap spaces across NUMA nodes.
3885 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3886 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3887 }
3888 }
3889 return JNI_OK;
3890 }
3891
3892 int Arguments::PropertyList_count(SystemProperty* pl) {
3893 int count = 0;
3894 while(pl != NULL) {
3895 count++;
3896 pl = pl->next();
3897 }
3898 return count;
3899 }
3900
3901 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3902 assert(key != NULL, "just checking");
3903 SystemProperty* prop;
3904 for (prop = pl; prop != NULL; prop = prop->next()) {
3905 if (strcmp(key, prop->key()) == 0) return prop->value();
3906 }
3907 return NULL;
3908 }
3909
3910 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3911 int count = 0;
3912 const char* ret_val = NULL;
3913
3914 while(pl != NULL) {
3915 if(count >= index) {
3916 ret_val = pl->key();
3917 break;
3918 }
3919 count++;
3920 pl = pl->next();
3921 }
3922
3923 return ret_val;
3924 }
3925
3926 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3927 int count = 0;
3928 char* ret_val = NULL;
3929
3930 while(pl != NULL) {
3931 if(count >= index) {
3932 ret_val = pl->value();
3933 break;
3934 }
3935 count++;
3936 pl = pl->next();
3937 }
3938
3939 return ret_val;
3940 }
3941
3942 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3943 SystemProperty* p = *plist;
3944 if (p == NULL) {
3945 *plist = new_p;
3946 } else {
3947 while (p->next() != NULL) {
3948 p = p->next();
3949 }
3950 p->set_next(new_p);
3951 }
3952 }
3953
3954 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3955 if (plist == NULL)
3956 return;
3957
3958 SystemProperty* new_p = new SystemProperty(k, v, true);
3959 PropertyList_add(plist, new_p);
3960 }
3961
3962 // This add maintains unique property key in the list.
3963 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3964 if (plist == NULL)
3965 return;
3966
3967 // If property key exist then update with new value.
3968 SystemProperty* prop;
3969 for (prop = *plist; prop != NULL; prop = prop->next()) {
3970 if (strcmp(k, prop->key()) == 0) {
3971 if (append) {
3972 prop->append_value(v);
3973 } else {
3974 prop->set_value(v);
3975 }
3976 return;
3977 }
3978 }
3979
3980 PropertyList_add(plist, k, v);
3981 }
3982
3983 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3984 // Returns true if all of the source pointed by src has been copied over to
3985 // the destination buffer pointed by buf. Otherwise, returns false.
3986 // Notes:
3987 // 1. If the length (buflen) of the destination buffer excluding the
3988 // NULL terminator character is not long enough for holding the expanded
3989 // pid characters, it also returns false instead of returning the partially
3990 // expanded one.
3991 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3992 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3993 char* buf, size_t buflen) {
3994 const char* p = src;
3995 char* b = buf;
3996 const char* src_end = &src[srclen];
3997 char* buf_end = &buf[buflen - 1];
3998
3999 while (p < src_end && b < buf_end) {
4000 if (*p == '%') {
4001 switch (*(++p)) {
4002 case '%': // "%%" ==> "%"
4003 *b++ = *p++;
4004 break;
4005 case 'p': { // "%p" ==> current process id
4006 // buf_end points to the character before the last character so
4007 // that we could write '\0' to the end of the buffer.
4008 size_t buf_sz = buf_end - b + 1;
4009 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4010
4011 // if jio_snprintf fails or the buffer is not long enough to hold
4012 // the expanded pid, returns false.
4013 if (ret < 0 || ret >= (int)buf_sz) {
4014 return false;
4015 } else {
4016 b += ret;
4017 assert(*b == '\0', "fail in copy_expand_pid");
4018 if (p == src_end && b == buf_end + 1) {
4019 // reach the end of the buffer.
4020 return true;
4021 }
4022 }
4023 p++;
4024 break;
4025 }
4026 default :
4027 *b++ = '%';
4028 }
4029 } else {
4030 *b++ = *p++;
4031 }
4032 }
4033 *b = '\0';
4034 return (p == src_end); // return false if not all of the source was copied
4035 }