1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "compiler/compilerOracle.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/cardTableRS.hpp"
32 #include "memory/genCollectedHeap.hpp"
33 #include "memory/referenceProcessor.hpp"
34 #include "memory/universe.inline.hpp"
35 #include "oops/oop.inline.hpp"
36 #include "prims/jvmtiExport.hpp"
37 #include "runtime/arguments.hpp"
38 #include "runtime/globals_extension.hpp"
39 #include "runtime/java.hpp"
40 #include "services/management.hpp"
41 #include "services/memTracker.hpp"
42 #include "utilities/defaultStream.hpp"
43 #include "utilities/macros.hpp"
44 #include "utilities/taskqueue.hpp"
45 #ifdef TARGET_OS_FAMILY_linux
46 # include "os_linux.inline.hpp"
47 #endif
48 #ifdef TARGET_OS_FAMILY_solaris
49 # include "os_solaris.inline.hpp"
50 #endif
51 #ifdef TARGET_OS_FAMILY_windows
52 # include "os_windows.inline.hpp"
53 #endif
54 #ifdef TARGET_OS_FAMILY_aix
55 # include "os_aix.inline.hpp"
56 #endif
57 #ifdef TARGET_OS_FAMILY_bsd
58 # include "os_bsd.inline.hpp"
59 #endif
60 #if INCLUDE_ALL_GCS
61 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
62 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
63 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
64 #endif // INCLUDE_ALL_GCS
65
66 // Note: This is a special bug reporting site for the JVM
67 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
68 #define DEFAULT_JAVA_LAUNCHER "generic"
69
70 // Disable options not supported in this release, with a warning if they
71 // were explicitly requested on the command-line
72 #define UNSUPPORTED_OPTION(opt, description) \
73 do { \
74 if (opt) { \
75 if (FLAG_IS_CMDLINE(opt)) { \
76 warning(description " is disabled in this release."); \
77 } \
78 FLAG_SET_DEFAULT(opt, false); \
79 } \
80 } while(0)
81
82 #define UNSUPPORTED_GC_OPTION(gc) \
83 do { \
84 if (gc) { \
85 if (FLAG_IS_CMDLINE(gc)) { \
86 warning(#gc " is not supported in this VM. Using Serial GC."); \
87 } \
88 FLAG_SET_DEFAULT(gc, false); \
89 } \
90 } while(0)
91
92 char** Arguments::_jvm_flags_array = NULL;
93 int Arguments::_num_jvm_flags = 0;
94 char** Arguments::_jvm_args_array = NULL;
95 int Arguments::_num_jvm_args = 0;
96 char* Arguments::_java_command = NULL;
97 SystemProperty* Arguments::_system_properties = NULL;
98 const char* Arguments::_gc_log_filename = NULL;
99 bool Arguments::_has_profile = false;
100 size_t Arguments::_conservative_max_heap_alignment = 0;
101 uintx Arguments::_min_heap_size = 0;
102 Arguments::Mode Arguments::_mode = _mixed;
103 bool Arguments::_java_compiler = false;
104 bool Arguments::_xdebug_mode = false;
105 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
106 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
107 int Arguments::_sun_java_launcher_pid = -1;
108 bool Arguments::_sun_java_launcher_is_altjvm = false;
109
110 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
111 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
112 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
113 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
114 bool Arguments::_ClipInlining = ClipInlining;
115
116 char* Arguments::SharedArchivePath = NULL;
117
118 AgentLibraryList Arguments::_libraryList;
119 AgentLibraryList Arguments::_agentList;
120
121 abort_hook_t Arguments::_abort_hook = NULL;
122 exit_hook_t Arguments::_exit_hook = NULL;
123 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
124
125
126 SystemProperty *Arguments::_java_ext_dirs = NULL;
127 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
128 SystemProperty *Arguments::_sun_boot_library_path = NULL;
129 SystemProperty *Arguments::_java_library_path = NULL;
130 SystemProperty *Arguments::_java_home = NULL;
131 SystemProperty *Arguments::_java_class_path = NULL;
132 SystemProperty *Arguments::_sun_boot_class_path = NULL;
133
134 char* Arguments::_meta_index_path = NULL;
135 char* Arguments::_meta_index_dir = NULL;
136
137 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
138
139 static bool match_option(const JavaVMOption *option, const char* name,
140 const char** tail) {
141 int len = (int)strlen(name);
142 if (strncmp(option->optionString, name, len) == 0) {
143 *tail = option->optionString + len;
144 return true;
145 } else {
146 return false;
147 }
148 }
149
150 static void logOption(const char* opt) {
151 if (PrintVMOptions) {
152 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
153 }
154 }
155
156 // Process java launcher properties.
157 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
158 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
159 // sun.java.launcher.pid is defined.
160 // Must do this before setting up other system properties,
161 // as some of them may depend on launcher type.
162 for (int index = 0; index < args->nOptions; index++) {
163 const JavaVMOption* option = args->options + index;
164 const char* tail;
165
166 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
167 process_java_launcher_argument(tail, option->extraInfo);
168 continue;
169 }
170 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
171 if (strcmp(tail, "true") == 0) {
172 _sun_java_launcher_is_altjvm = true;
173 }
174 continue;
175 }
176 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
177 _sun_java_launcher_pid = atoi(tail);
178 continue;
179 }
180 }
181 }
182
183 // Initialize system properties key and value.
184 void Arguments::init_system_properties() {
185
186 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
187 "Java Virtual Machine Specification", false));
188 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
190 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
191
192 // Following are JVMTI agent writable properties.
193 // Properties values are set to NULL and they are
194 // os specific they are initialized in os::init_system_properties_values().
195 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
196 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
197 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
198 _java_library_path = new SystemProperty("java.library.path", NULL, true);
199 _java_home = new SystemProperty("java.home", NULL, true);
200 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
201
202 _java_class_path = new SystemProperty("java.class.path", "", true);
203
204 // Add to System Property list.
205 PropertyList_add(&_system_properties, _java_ext_dirs);
206 PropertyList_add(&_system_properties, _java_endorsed_dirs);
207 PropertyList_add(&_system_properties, _sun_boot_library_path);
208 PropertyList_add(&_system_properties, _java_library_path);
209 PropertyList_add(&_system_properties, _java_home);
210 PropertyList_add(&_system_properties, _java_class_path);
211 PropertyList_add(&_system_properties, _sun_boot_class_path);
212
213 // Set OS specific system properties values
214 os::init_system_properties_values();
215 }
216
217
218 // Update/Initialize System properties after JDK version number is known
219 void Arguments::init_version_specific_system_properties() {
220 enum { bufsz = 16 };
221 char buffer[bufsz];
222 const char* spec_vendor = "Sun Microsystems Inc.";
223 uint32_t spec_version = 0;
224
225 if (JDK_Version::is_gte_jdk17x_version()) {
226 spec_vendor = "Oracle Corporation";
227 spec_version = JDK_Version::current().major_version();
228 }
229 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
230
231 PropertyList_add(&_system_properties,
232 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
233 PropertyList_add(&_system_properties,
234 new SystemProperty("java.vm.specification.version", buffer, false));
235 PropertyList_add(&_system_properties,
236 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
237 }
238
239 /**
240 * Provide a slightly more user-friendly way of eliminating -XX flags.
241 * When a flag is eliminated, it can be added to this list in order to
242 * continue accepting this flag on the command-line, while issuing a warning
243 * and ignoring the value. Once the JDK version reaches the 'accept_until'
244 * limit, we flatly refuse to admit the existence of the flag. This allows
245 * a flag to die correctly over JDK releases using HSX.
246 */
247 typedef struct {
248 const char* name;
249 JDK_Version obsoleted_in; // when the flag went away
250 JDK_Version accept_until; // which version to start denying the existence
251 } ObsoleteFlag;
252
253 static ObsoleteFlag obsolete_jvm_flags[] = {
254 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
258 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
259 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
260 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
261 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
262 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
263 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
264 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
265 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
266 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
267 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
268 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
269 { "DefaultInitialRAMFraction",
270 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
271 { "UseDepthFirstScavengeOrder",
272 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
273 { "HandlePromotionFailure",
274 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
275 { "MaxLiveObjectEvacuationRatio",
276 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
277 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
278 { "UseParallelOldGCCompacting",
279 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
280 { "UseParallelDensePrefixUpdate",
281 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
282 { "UseParallelOldGCDensePrefix",
283 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
284 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
285 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
286 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
295 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
296 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
297 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
298 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
299 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
300 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
302 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
303 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
304 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
305 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
306 #ifdef PRODUCT
307 { "DesiredMethodLimit",
308 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
309 #endif // PRODUCT
310 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) },
311 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
312 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
313 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
314 { NULL, JDK_Version(0), JDK_Version(0) }
315 };
316
317 // Returns true if the flag is obsolete and fits into the range specified
318 // for being ignored. In the case that the flag is ignored, the 'version'
319 // value is filled in with the version number when the flag became
320 // obsolete so that that value can be displayed to the user.
321 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
322 int i = 0;
323 assert(version != NULL, "Must provide a version buffer");
324 while (obsolete_jvm_flags[i].name != NULL) {
325 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
326 // <flag>=xxx form
327 // [-|+]<flag> form
328 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
329 ((s[0] == '+' || s[0] == '-') &&
330 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
331 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
332 *version = flag_status.obsoleted_in;
333 return true;
334 }
335 }
336 i++;
337 }
338 return false;
339 }
340
341 // Constructs the system class path (aka boot class path) from the following
342 // components, in order:
343 //
344 // prefix // from -Xbootclasspath/p:...
345 // endorsed // the expansion of -Djava.endorsed.dirs=...
346 // base // from os::get_system_properties() or -Xbootclasspath=
347 // suffix // from -Xbootclasspath/a:...
348 //
349 // java.endorsed.dirs is a list of directories; any jar or zip files in the
350 // directories are added to the sysclasspath just before the base.
351 //
352 // This could be AllStatic, but it isn't needed after argument processing is
353 // complete.
354 class SysClassPath: public StackObj {
355 public:
356 SysClassPath(const char* base);
357 ~SysClassPath();
358
359 inline void set_base(const char* base);
360 inline void add_prefix(const char* prefix);
361 inline void add_suffix_to_prefix(const char* suffix);
362 inline void add_suffix(const char* suffix);
363 inline void reset_path(const char* base);
364
365 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
366 // property. Must be called after all command-line arguments have been
367 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
368 // combined_path().
369 void expand_endorsed();
370
371 inline const char* get_base() const { return _items[_scp_base]; }
372 inline const char* get_prefix() const { return _items[_scp_prefix]; }
373 inline const char* get_suffix() const { return _items[_scp_suffix]; }
374 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
375
376 // Combine all the components into a single c-heap-allocated string; caller
377 // must free the string if/when no longer needed.
378 char* combined_path();
379
380 private:
381 // Utility routines.
382 static char* add_to_path(const char* path, const char* str, bool prepend);
383 static char* add_jars_to_path(char* path, const char* directory);
384
385 inline void reset_item_at(int index);
386
387 // Array indices for the items that make up the sysclasspath. All except the
388 // base are allocated in the C heap and freed by this class.
389 enum {
390 _scp_prefix, // from -Xbootclasspath/p:...
391 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
392 _scp_base, // the default sysclasspath
393 _scp_suffix, // from -Xbootclasspath/a:...
394 _scp_nitems // the number of items, must be last.
395 };
396
397 const char* _items[_scp_nitems];
398 DEBUG_ONLY(bool _expansion_done;)
399 };
400
401 SysClassPath::SysClassPath(const char* base) {
402 memset(_items, 0, sizeof(_items));
403 _items[_scp_base] = base;
404 DEBUG_ONLY(_expansion_done = false;)
405 }
406
407 SysClassPath::~SysClassPath() {
408 // Free everything except the base.
409 for (int i = 0; i < _scp_nitems; ++i) {
410 if (i != _scp_base) reset_item_at(i);
411 }
412 DEBUG_ONLY(_expansion_done = false;)
413 }
414
415 inline void SysClassPath::set_base(const char* base) {
416 _items[_scp_base] = base;
417 }
418
419 inline void SysClassPath::add_prefix(const char* prefix) {
420 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
421 }
422
423 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
424 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
425 }
426
427 inline void SysClassPath::add_suffix(const char* suffix) {
428 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
429 }
430
431 inline void SysClassPath::reset_item_at(int index) {
432 assert(index < _scp_nitems && index != _scp_base, "just checking");
433 if (_items[index] != NULL) {
434 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
435 _items[index] = NULL;
436 }
437 }
438
439 inline void SysClassPath::reset_path(const char* base) {
440 // Clear the prefix and suffix.
441 reset_item_at(_scp_prefix);
442 reset_item_at(_scp_suffix);
443 set_base(base);
444 }
445
446 //------------------------------------------------------------------------------
447
448 void SysClassPath::expand_endorsed() {
449 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
450
451 const char* path = Arguments::get_property("java.endorsed.dirs");
452 if (path == NULL) {
453 path = Arguments::get_endorsed_dir();
454 assert(path != NULL, "no default for java.endorsed.dirs");
455 }
456
457 char* expanded_path = NULL;
458 const char separator = *os::path_separator();
459 const char* const end = path + strlen(path);
460 while (path < end) {
461 const char* tmp_end = strchr(path, separator);
462 if (tmp_end == NULL) {
463 expanded_path = add_jars_to_path(expanded_path, path);
464 path = end;
465 } else {
466 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
467 memcpy(dirpath, path, tmp_end - path);
468 dirpath[tmp_end - path] = '\0';
469 expanded_path = add_jars_to_path(expanded_path, dirpath);
470 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
471 path = tmp_end + 1;
472 }
473 }
474 _items[_scp_endorsed] = expanded_path;
475 DEBUG_ONLY(_expansion_done = true;)
476 }
477
478 // Combine the bootclasspath elements, some of which may be null, into a single
479 // c-heap-allocated string.
480 char* SysClassPath::combined_path() {
481 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
482 assert(_expansion_done, "must call expand_endorsed() first.");
483
484 size_t lengths[_scp_nitems];
485 size_t total_len = 0;
486
487 const char separator = *os::path_separator();
488
489 // Get the lengths.
490 int i;
491 for (i = 0; i < _scp_nitems; ++i) {
492 if (_items[i] != NULL) {
493 lengths[i] = strlen(_items[i]);
494 // Include space for the separator char (or a NULL for the last item).
495 total_len += lengths[i] + 1;
496 }
497 }
498 assert(total_len > 0, "empty sysclasspath not allowed");
499
500 // Copy the _items to a single string.
501 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
502 char* cp_tmp = cp;
503 for (i = 0; i < _scp_nitems; ++i) {
504 if (_items[i] != NULL) {
505 memcpy(cp_tmp, _items[i], lengths[i]);
506 cp_tmp += lengths[i];
507 *cp_tmp++ = separator;
508 }
509 }
510 *--cp_tmp = '\0'; // Replace the extra separator.
511 return cp;
512 }
513
514 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
515 char*
516 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
517 char *cp;
518
519 assert(str != NULL, "just checking");
520 if (path == NULL) {
521 size_t len = strlen(str) + 1;
522 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
523 memcpy(cp, str, len); // copy the trailing null
524 } else {
525 const char separator = *os::path_separator();
526 size_t old_len = strlen(path);
527 size_t str_len = strlen(str);
528 size_t len = old_len + str_len + 2;
529
530 if (prepend) {
531 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
532 char* cp_tmp = cp;
533 memcpy(cp_tmp, str, str_len);
534 cp_tmp += str_len;
535 *cp_tmp = separator;
536 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
537 FREE_C_HEAP_ARRAY(char, path, mtInternal);
538 } else {
539 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
540 char* cp_tmp = cp + old_len;
541 *cp_tmp = separator;
542 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
543 }
544 }
545 return cp;
546 }
547
548 // Scan the directory and append any jar or zip files found to path.
549 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
550 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
551 DIR* dir = os::opendir(directory);
552 if (dir == NULL) return path;
553
554 char dir_sep[2] = { '\0', '\0' };
555 size_t directory_len = strlen(directory);
556 const char fileSep = *os::file_separator();
557 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
558
559 /* Scan the directory for jars/zips, appending them to path. */
560 struct dirent *entry;
561 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
562 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
563 const char* name = entry->d_name;
564 const char* ext = name + strlen(name) - 4;
565 bool isJarOrZip = ext > name &&
566 (os::file_name_strcmp(ext, ".jar") == 0 ||
567 os::file_name_strcmp(ext, ".zip") == 0);
568 if (isJarOrZip) {
569 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
570 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
571 path = add_to_path(path, jarpath, false);
572 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
573 }
574 }
575 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
576 os::closedir(dir);
577 return path;
578 }
579
580 // Parses a memory size specification string.
581 static bool atomull(const char *s, julong* result) {
582 julong n = 0;
583 int args_read = 0;
584 bool is_hex = false;
585 // Skip leading 0[xX] for hexadecimal
586 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
587 s += 2;
588 is_hex = true;
589 args_read = sscanf(s, JULONG_FORMAT_X, &n);
590 } else {
591 args_read = sscanf(s, JULONG_FORMAT, &n);
592 }
593 if (args_read != 1) {
594 return false;
595 }
596 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
597 s++;
598 }
599 // 4705540: illegal if more characters are found after the first non-digit
600 if (strlen(s) > 1) {
601 return false;
602 }
603 switch (*s) {
604 case 'T': case 't':
605 *result = n * G * K;
606 // Check for overflow.
607 if (*result/((julong)G * K) != n) return false;
608 return true;
609 case 'G': case 'g':
610 *result = n * G;
611 if (*result/G != n) return false;
612 return true;
613 case 'M': case 'm':
614 *result = n * M;
615 if (*result/M != n) return false;
616 return true;
617 case 'K': case 'k':
618 *result = n * K;
619 if (*result/K != n) return false;
620 return true;
621 case '\0':
622 *result = n;
623 return true;
624 default:
625 return false;
626 }
627 }
628
629 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
630 if (size < min_size) return arg_too_small;
631 // Check that size will fit in a size_t (only relevant on 32-bit)
632 if (size > max_uintx) return arg_too_big;
633 return arg_in_range;
634 }
635
636 // Describe an argument out of range error
637 void Arguments::describe_range_error(ArgsRange errcode) {
638 switch(errcode) {
639 case arg_too_big:
640 jio_fprintf(defaultStream::error_stream(),
641 "The specified size exceeds the maximum "
642 "representable size.\n");
643 break;
644 case arg_too_small:
645 case arg_unreadable:
646 case arg_in_range:
647 // do nothing for now
648 break;
649 default:
650 ShouldNotReachHere();
651 }
652 }
653
654 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
655 return CommandLineFlags::boolAtPut(name, &value, origin);
656 }
657
658 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
659 double v;
660 if (sscanf(value, "%lf", &v) != 1) {
661 return false;
662 }
663
664 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
665 return true;
666 }
667 return false;
668 }
669
670 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
671 julong v;
672 intx intx_v;
673 bool is_neg = false;
674 // Check the sign first since atomull() parses only unsigned values.
675 if (*value == '-') {
676 if (!CommandLineFlags::intxAt(name, &intx_v)) {
677 return false;
678 }
679 value++;
680 is_neg = true;
681 }
682 if (!atomull(value, &v)) {
683 return false;
684 }
685 intx_v = (intx) v;
686 if (is_neg) {
687 intx_v = -intx_v;
688 }
689 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
690 return true;
691 }
692 uintx uintx_v = (uintx) v;
693 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
694 return true;
695 }
696 uint64_t uint64_t_v = (uint64_t) v;
697 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
698 return true;
699 }
700 return false;
701 }
702
703 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
704 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
705 // Contract: CommandLineFlags always returns a pointer that needs freeing.
706 FREE_C_HEAP_ARRAY(char, value, mtInternal);
707 return true;
708 }
709
710 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
711 const char* old_value = "";
712 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
713 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
714 size_t new_len = strlen(new_value);
715 const char* value;
716 char* free_this_too = NULL;
717 if (old_len == 0) {
718 value = new_value;
719 } else if (new_len == 0) {
720 value = old_value;
721 } else {
722 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
723 // each new setting adds another LINE to the switch:
724 sprintf(buf, "%s\n%s", old_value, new_value);
725 value = buf;
726 free_this_too = buf;
727 }
728 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
729 // CommandLineFlags always returns a pointer that needs freeing.
730 FREE_C_HEAP_ARRAY(char, value, mtInternal);
731 if (free_this_too != NULL) {
732 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
733 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
734 }
735 return true;
736 }
737
738 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
739
740 // range of acceptable characters spelled out for portability reasons
741 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
742 #define BUFLEN 255
743 char name[BUFLEN+1];
744 char dummy;
745
746 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
747 return set_bool_flag(name, false, origin);
748 }
749 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
750 return set_bool_flag(name, true, origin);
751 }
752
753 char punct;
754 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
755 const char* value = strchr(arg, '=') + 1;
756 Flag* flag = Flag::find_flag(name, strlen(name));
757 if (flag != NULL && flag->is_ccstr()) {
758 if (flag->ccstr_accumulates()) {
759 return append_to_string_flag(name, value, origin);
760 } else {
761 if (value[0] == '\0') {
762 value = NULL;
763 }
764 return set_string_flag(name, value, origin);
765 }
766 }
767 }
768
769 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
770 const char* value = strchr(arg, '=') + 1;
771 // -XX:Foo:=xxx will reset the string flag to the given value.
772 if (value[0] == '\0') {
773 value = NULL;
774 }
775 return set_string_flag(name, value, origin);
776 }
777
778 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
779 #define SIGNED_NUMBER_RANGE "[-0123456789]"
780 #define NUMBER_RANGE "[0123456789]"
781 char value[BUFLEN + 1];
782 char value2[BUFLEN + 1];
783 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
784 // Looks like a floating-point number -- try again with more lenient format string
785 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
786 return set_fp_numeric_flag(name, value, origin);
787 }
788 }
789
790 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
791 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
792 return set_numeric_flag(name, value, origin);
793 }
794
795 return false;
796 }
797
798 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
799 assert(bldarray != NULL, "illegal argument");
800
801 if (arg == NULL) {
802 return;
803 }
804
805 int new_count = *count + 1;
806
807 // expand the array and add arg to the last element
808 if (*bldarray == NULL) {
809 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
810 } else {
811 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
812 }
813 (*bldarray)[*count] = strdup(arg);
814 *count = new_count;
815 }
816
817 void Arguments::build_jvm_args(const char* arg) {
818 add_string(&_jvm_args_array, &_num_jvm_args, arg);
819 }
820
821 void Arguments::build_jvm_flags(const char* arg) {
822 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
823 }
824
825 // utility function to return a string that concatenates all
826 // strings in a given char** array
827 const char* Arguments::build_resource_string(char** args, int count) {
828 if (args == NULL || count == 0) {
829 return NULL;
830 }
831 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
832 for (int i = 1; i < count; i++) {
833 length += strlen(args[i]) + 1; // add 1 for a space
834 }
835 char* s = NEW_RESOURCE_ARRAY(char, length);
836 strcpy(s, args[0]);
837 for (int j = 1; j < count; j++) {
838 strcat(s, " ");
839 strcat(s, args[j]);
840 }
841 return (const char*) s;
842 }
843
844 void Arguments::print_on(outputStream* st) {
845 st->print_cr("VM Arguments:");
846 if (num_jvm_flags() > 0) {
847 st->print("jvm_flags: "); print_jvm_flags_on(st);
848 }
849 if (num_jvm_args() > 0) {
850 st->print("jvm_args: "); print_jvm_args_on(st);
851 }
852 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
853 if (_java_class_path != NULL) {
854 char* path = _java_class_path->value();
855 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
856 }
857 st->print_cr("Launcher Type: %s", _sun_java_launcher);
858 }
859
860 void Arguments::print_jvm_flags_on(outputStream* st) {
861 if (_num_jvm_flags > 0) {
862 for (int i=0; i < _num_jvm_flags; i++) {
863 st->print("%s ", _jvm_flags_array[i]);
864 }
865 st->cr();
866 }
867 }
868
869 void Arguments::print_jvm_args_on(outputStream* st) {
870 if (_num_jvm_args > 0) {
871 for (int i=0; i < _num_jvm_args; i++) {
872 st->print("%s ", _jvm_args_array[i]);
873 }
874 st->cr();
875 }
876 }
877
878 bool Arguments::process_argument(const char* arg,
879 jboolean ignore_unrecognized, Flag::Flags origin) {
880
881 JDK_Version since = JDK_Version();
882
883 if (parse_argument(arg, origin) || ignore_unrecognized) {
884 return true;
885 }
886
887 bool has_plus_minus = (*arg == '+' || *arg == '-');
888 const char* const argname = has_plus_minus ? arg + 1 : arg;
889 if (is_newly_obsolete(arg, &since)) {
890 char version[256];
891 since.to_string(version, sizeof(version));
892 warning("ignoring option %s; support was removed in %s", argname, version);
893 return true;
894 }
895
896 // For locked flags, report a custom error message if available.
897 // Otherwise, report the standard unrecognized VM option.
898
899 size_t arg_len;
900 const char* equal_sign = strchr(argname, '=');
901 if (equal_sign == NULL) {
902 arg_len = strlen(argname);
903 } else {
904 arg_len = equal_sign - argname;
905 }
906
907 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
908 if (found_flag != NULL) {
909 char locked_message_buf[BUFLEN];
910 found_flag->get_locked_message(locked_message_buf, BUFLEN);
911 if (strlen(locked_message_buf) == 0) {
912 if (found_flag->is_bool() && !has_plus_minus) {
913 jio_fprintf(defaultStream::error_stream(),
914 "Missing +/- setting for VM option '%s'\n", argname);
915 } else if (!found_flag->is_bool() && has_plus_minus) {
916 jio_fprintf(defaultStream::error_stream(),
917 "Unexpected +/- setting in VM option '%s'\n", argname);
918 } else {
919 jio_fprintf(defaultStream::error_stream(),
920 "Improperly specified VM option '%s'\n", argname);
921 }
922 } else {
923 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
924 }
925 } else {
926 jio_fprintf(defaultStream::error_stream(),
927 "Unrecognized VM option '%s'\n", argname);
928 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
929 if (fuzzy_matched != NULL) {
930 jio_fprintf(defaultStream::error_stream(),
931 "Did you mean '%s%s%s'?\n",
932 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
933 fuzzy_matched->_name,
934 (fuzzy_matched->is_bool()) ? "" : "=<value>");
935 }
936 }
937
938 // allow for commandline "commenting out" options like -XX:#+Verbose
939 return arg[0] == '#';
940 }
941
942 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
943 FILE* stream = fopen(file_name, "rb");
944 if (stream == NULL) {
945 if (should_exist) {
946 jio_fprintf(defaultStream::error_stream(),
947 "Could not open settings file %s\n", file_name);
948 return false;
949 } else {
950 return true;
951 }
952 }
953
954 char token[1024];
955 int pos = 0;
956
957 bool in_white_space = true;
958 bool in_comment = false;
959 bool in_quote = false;
960 char quote_c = 0;
961 bool result = true;
962
963 int c = getc(stream);
964 while(c != EOF && pos < (int)(sizeof(token)-1)) {
965 if (in_white_space) {
966 if (in_comment) {
967 if (c == '\n') in_comment = false;
968 } else {
969 if (c == '#') in_comment = true;
970 else if (!isspace(c)) {
971 in_white_space = false;
972 token[pos++] = c;
973 }
974 }
975 } else {
976 if (c == '\n' || (!in_quote && isspace(c))) {
977 // token ends at newline, or at unquoted whitespace
978 // this allows a way to include spaces in string-valued options
979 token[pos] = '\0';
980 logOption(token);
981 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
982 build_jvm_flags(token);
983 pos = 0;
984 in_white_space = true;
985 in_quote = false;
986 } else if (!in_quote && (c == '\'' || c == '"')) {
987 in_quote = true;
988 quote_c = c;
989 } else if (in_quote && (c == quote_c)) {
990 in_quote = false;
991 } else {
992 token[pos++] = c;
993 }
994 }
995 c = getc(stream);
996 }
997 if (pos > 0) {
998 token[pos] = '\0';
999 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1000 build_jvm_flags(token);
1001 }
1002 fclose(stream);
1003 return result;
1004 }
1005
1006 //=============================================================================================================
1007 // Parsing of properties (-D)
1008
1009 const char* Arguments::get_property(const char* key) {
1010 return PropertyList_get_value(system_properties(), key);
1011 }
1012
1013 bool Arguments::add_property(const char* prop) {
1014 const char* eq = strchr(prop, '=');
1015 char* key;
1016 // ns must be static--its address may be stored in a SystemProperty object.
1017 const static char ns[1] = {0};
1018 char* value = (char *)ns;
1019
1020 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1021 key = AllocateHeap(key_len + 1, mtInternal);
1022 strncpy(key, prop, key_len);
1023 key[key_len] = '\0';
1024
1025 if (eq != NULL) {
1026 size_t value_len = strlen(prop) - key_len - 1;
1027 value = AllocateHeap(value_len + 1, mtInternal);
1028 strncpy(value, &prop[key_len + 1], value_len + 1);
1029 }
1030
1031 if (strcmp(key, "java.compiler") == 0) {
1032 process_java_compiler_argument(value);
1033 FreeHeap(key);
1034 if (eq != NULL) {
1035 FreeHeap(value);
1036 }
1037 return true;
1038 } else if (strcmp(key, "sun.java.command") == 0) {
1039 _java_command = value;
1040
1041 // Record value in Arguments, but let it get passed to Java.
1042 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1043 strcmp(key, "sun.java.launcher.pid") == 0) {
1044 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1045 // private and are processed in process_sun_java_launcher_properties();
1046 // the sun.java.launcher property is passed on to the java application
1047 FreeHeap(key);
1048 if (eq != NULL) {
1049 FreeHeap(value);
1050 }
1051 return true;
1052 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1053 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1054 // its value without going through the property list or making a Java call.
1055 _java_vendor_url_bug = value;
1056 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1057 PropertyList_unique_add(&_system_properties, key, value, true);
1058 return true;
1059 }
1060 // Create new property and add at the end of the list
1061 PropertyList_unique_add(&_system_properties, key, value);
1062 return true;
1063 }
1064
1065 //===========================================================================================================
1066 // Setting int/mixed/comp mode flags
1067
1068 void Arguments::set_mode_flags(Mode mode) {
1069 // Set up default values for all flags.
1070 // If you add a flag to any of the branches below,
1071 // add a default value for it here.
1072 set_java_compiler(false);
1073 _mode = mode;
1074
1075 // Ensure Agent_OnLoad has the correct initial values.
1076 // This may not be the final mode; mode may change later in onload phase.
1077 PropertyList_unique_add(&_system_properties, "java.vm.info",
1078 (char*)VM_Version::vm_info_string(), false);
1079
1080 UseInterpreter = true;
1081 UseCompiler = true;
1082 UseLoopCounter = true;
1083
1084 #ifndef ZERO
1085 // Turn these off for mixed and comp. Leave them on for Zero.
1086 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1087 UseFastAccessorMethods = (mode == _int);
1088 }
1089 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1090 UseFastEmptyMethods = (mode == _int);
1091 }
1092 #endif
1093
1094 // Default values may be platform/compiler dependent -
1095 // use the saved values
1096 ClipInlining = Arguments::_ClipInlining;
1097 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1098 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1099 BackgroundCompilation = Arguments::_BackgroundCompilation;
1100
1101 // Change from defaults based on mode
1102 switch (mode) {
1103 default:
1104 ShouldNotReachHere();
1105 break;
1106 case _int:
1107 UseCompiler = false;
1108 UseLoopCounter = false;
1109 AlwaysCompileLoopMethods = false;
1110 UseOnStackReplacement = false;
1111 break;
1112 case _mixed:
1113 // same as default
1114 break;
1115 case _comp:
1116 UseInterpreter = false;
1117 BackgroundCompilation = false;
1118 ClipInlining = false;
1119 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1120 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1121 // compile a level 4 (C2) and then continue executing it.
1122 if (TieredCompilation) {
1123 Tier3InvokeNotifyFreqLog = 0;
1124 Tier4InvocationThreshold = 0;
1125 }
1126 break;
1127 }
1128 }
1129
1130 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1131 // Conflict: required to use shared spaces (-Xshare:on), but
1132 // incompatible command line options were chosen.
1133
1134 static void no_shared_spaces() {
1135 if (RequireSharedSpaces) {
1136 jio_fprintf(defaultStream::error_stream(),
1137 "Class data sharing is inconsistent with other specified options.\n");
1138 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1139 } else {
1140 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1141 }
1142 }
1143 #endif
1144
1145 void Arguments::set_tiered_flags() {
1146 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1147 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1148 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1149 }
1150 if (CompilationPolicyChoice < 2) {
1151 vm_exit_during_initialization(
1152 "Incompatible compilation policy selected", NULL);
1153 }
1154 // Increase the code cache size - tiered compiles a lot more.
1155 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1156 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1157 }
1158 if (!UseInterpreter) { // -Xcomp
1159 Tier3InvokeNotifyFreqLog = 0;
1160 Tier4InvocationThreshold = 0;
1161 }
1162 }
1163
1164 #if INCLUDE_ALL_GCS
1165 static void disable_adaptive_size_policy(const char* collector_name) {
1166 if (UseAdaptiveSizePolicy) {
1167 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1168 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1169 collector_name);
1170 }
1171 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1172 }
1173 }
1174
1175 void Arguments::set_parnew_gc_flags() {
1176 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1177 "control point invariant");
1178 assert(UseParNewGC, "Error");
1179
1180 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1181 disable_adaptive_size_policy("UseParNewGC");
1182
1183 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1184 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1185 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1186 } else if (ParallelGCThreads == 0) {
1187 jio_fprintf(defaultStream::error_stream(),
1188 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1189 vm_exit(1);
1190 }
1191
1192 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1193 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1194 // we set them to 1024 and 1024.
1195 // See CR 6362902.
1196 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1197 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1198 }
1199 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1200 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1201 }
1202
1203 // When using compressed oops, we use local overflow stacks,
1204 // rather than using a global overflow list chained through
1205 // the klass word of the object's pre-image.
1206 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1207 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1208 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1209 }
1210 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1211 }
1212 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1213 }
1214
1215 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1216 // sparc/solaris for certain applications, but would gain from
1217 // further optimization and tuning efforts, and would almost
1218 // certainly gain from analysis of platform and environment.
1219 void Arguments::set_cms_and_parnew_gc_flags() {
1220 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1221 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1222
1223 // If we are using CMS, we prefer to UseParNewGC,
1224 // unless explicitly forbidden.
1225 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1226 FLAG_SET_ERGO(bool, UseParNewGC, true);
1227 }
1228
1229 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1230 disable_adaptive_size_policy("UseConcMarkSweepGC");
1231
1232 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1233 // as needed.
1234 if (UseParNewGC) {
1235 set_parnew_gc_flags();
1236 }
1237
1238 size_t max_heap = align_size_down(MaxHeapSize,
1239 CardTableRS::ct_max_alignment_constraint());
1240
1241 // Now make adjustments for CMS
1242 intx tenuring_default = (intx)6;
1243 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1244
1245 // Preferred young gen size for "short" pauses:
1246 // upper bound depends on # of threads and NewRatio.
1247 const uintx parallel_gc_threads =
1248 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1249 const size_t preferred_max_new_size_unaligned =
1250 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1251 size_t preferred_max_new_size =
1252 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1253
1254 // Unless explicitly requested otherwise, size young gen
1255 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1256
1257 // If either MaxNewSize or NewRatio is set on the command line,
1258 // assume the user is trying to set the size of the young gen.
1259 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1260
1261 // Set MaxNewSize to our calculated preferred_max_new_size unless
1262 // NewSize was set on the command line and it is larger than
1263 // preferred_max_new_size.
1264 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1265 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1266 } else {
1267 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1268 }
1269 if (PrintGCDetails && Verbose) {
1270 // Too early to use gclog_or_tty
1271 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1272 }
1273
1274 // Code along this path potentially sets NewSize and OldSize
1275 if (PrintGCDetails && Verbose) {
1276 // Too early to use gclog_or_tty
1277 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1278 " initial_heap_size: " SIZE_FORMAT
1279 " max_heap: " SIZE_FORMAT,
1280 min_heap_size(), InitialHeapSize, max_heap);
1281 }
1282 size_t min_new = preferred_max_new_size;
1283 if (FLAG_IS_CMDLINE(NewSize)) {
1284 min_new = NewSize;
1285 }
1286 if (max_heap > min_new && min_heap_size() > min_new) {
1287 // Unless explicitly requested otherwise, make young gen
1288 // at least min_new, and at most preferred_max_new_size.
1289 if (FLAG_IS_DEFAULT(NewSize)) {
1290 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1291 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1292 if (PrintGCDetails && Verbose) {
1293 // Too early to use gclog_or_tty
1294 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1295 }
1296 }
1297 // Unless explicitly requested otherwise, size old gen
1298 // so it's NewRatio x of NewSize.
1299 if (FLAG_IS_DEFAULT(OldSize)) {
1300 if (max_heap > NewSize) {
1301 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1302 if (PrintGCDetails && Verbose) {
1303 // Too early to use gclog_or_tty
1304 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1305 }
1306 }
1307 }
1308 }
1309 }
1310 // Unless explicitly requested otherwise, definitely
1311 // promote all objects surviving "tenuring_default" scavenges.
1312 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1313 FLAG_IS_DEFAULT(SurvivorRatio)) {
1314 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1315 }
1316 // If we decided above (or user explicitly requested)
1317 // `promote all' (via MaxTenuringThreshold := 0),
1318 // prefer minuscule survivor spaces so as not to waste
1319 // space for (non-existent) survivors
1320 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1321 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1322 }
1323 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1324 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1325 // This is done in order to make ParNew+CMS configuration to work
1326 // with YoungPLABSize and OldPLABSize options.
1327 // See CR 6362902.
1328 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1329 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1330 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1331 // is. In this situation let CMSParPromoteBlocksToClaim follow
1332 // the value (either from the command line or ergonomics) of
1333 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1334 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1335 } else {
1336 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1337 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1338 // we'll let it to take precedence.
1339 jio_fprintf(defaultStream::error_stream(),
1340 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1341 " options are specified for the CMS collector."
1342 " CMSParPromoteBlocksToClaim will take precedence.\n");
1343 }
1344 }
1345 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1346 // OldPLAB sizing manually turned off: Use a larger default setting,
1347 // unless it was manually specified. This is because a too-low value
1348 // will slow down scavenges.
1349 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1350 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1351 }
1352 }
1353 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1354 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1355 // If either of the static initialization defaults have changed, note this
1356 // modification.
1357 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1358 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1359 }
1360 if (PrintGCDetails && Verbose) {
1361 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1362 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1363 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1364 }
1365 }
1366 #endif // INCLUDE_ALL_GCS
1367
1368 void set_object_alignment() {
1369 // Object alignment.
1370 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1371 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1372 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1373 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1374 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1375 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1376
1377 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1378 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1379
1380 // Oop encoding heap max
1381 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1382
1383 #if INCLUDE_ALL_GCS
1384 // Set CMS global values
1385 CompactibleFreeListSpace::set_cms_values();
1386 #endif // INCLUDE_ALL_GCS
1387 }
1388
1389 bool verify_object_alignment() {
1390 // Object alignment.
1391 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1392 jio_fprintf(defaultStream::error_stream(),
1393 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1394 (int)ObjectAlignmentInBytes);
1395 return false;
1396 }
1397 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1398 jio_fprintf(defaultStream::error_stream(),
1399 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1400 (int)ObjectAlignmentInBytes, BytesPerLong);
1401 return false;
1402 }
1403 // It does not make sense to have big object alignment
1404 // since a space lost due to alignment will be greater
1405 // then a saved space from compressed oops.
1406 if ((int)ObjectAlignmentInBytes > 256) {
1407 jio_fprintf(defaultStream::error_stream(),
1408 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1409 (int)ObjectAlignmentInBytes);
1410 return false;
1411 }
1412 // In case page size is very small.
1413 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1414 jio_fprintf(defaultStream::error_stream(),
1415 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1416 (int)ObjectAlignmentInBytes, os::vm_page_size());
1417 return false;
1418 }
1419 return true;
1420 }
1421
1422 uintx Arguments::max_heap_for_compressed_oops() {
1423 // Avoid sign flip.
1424 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1425 // We need to fit both the NULL page and the heap into the memory budget, while
1426 // keeping alignment constraints of the heap. To guarantee the latter, as the
1427 // NULL page is located before the heap, we pad the NULL page to the conservative
1428 // maximum alignment that the GC may ever impose upon the heap.
1429 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1430 _conservative_max_heap_alignment);
1431
1432 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1433 NOT_LP64(ShouldNotReachHere(); return 0);
1434 }
1435
1436 bool Arguments::should_auto_select_low_pause_collector() {
1437 if (UseAutoGCSelectPolicy &&
1438 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1439 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1440 if (PrintGCDetails) {
1441 // Cannot use gclog_or_tty yet.
1442 tty->print_cr("Automatic selection of the low pause collector"
1443 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1444 }
1445 return true;
1446 }
1447 return false;
1448 }
1449
1450 void Arguments::set_use_compressed_oops() {
1451 #ifndef ZERO
1452 #ifdef _LP64
1453 // MaxHeapSize is not set up properly at this point, but
1454 // the only value that can override MaxHeapSize if we are
1455 // to use UseCompressedOops is InitialHeapSize.
1456 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1457
1458 if (max_heap_size <= max_heap_for_compressed_oops()) {
1459 #if !defined(COMPILER1) || defined(TIERED)
1460 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1461 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1462 }
1463 #endif
1464 #ifdef _WIN64
1465 if (UseLargePages && UseCompressedOops) {
1466 // Cannot allocate guard pages for implicit checks in indexed addressing
1467 // mode, when large pages are specified on windows.
1468 // This flag could be switched ON if narrow oop base address is set to 0,
1469 // see code in Universe::initialize_heap().
1470 Universe::set_narrow_oop_use_implicit_null_checks(false);
1471 }
1472 #endif // _WIN64
1473 } else {
1474 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1475 warning("Max heap size too large for Compressed Oops");
1476 FLAG_SET_DEFAULT(UseCompressedOops, false);
1477 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1478 }
1479 }
1480 #endif // _LP64
1481 #endif // ZERO
1482 }
1483
1484
1485 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1486 // set_use_compressed_oops().
1487 void Arguments::set_use_compressed_klass_ptrs() {
1488 #ifndef ZERO
1489 #ifdef _LP64
1490 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1491 if (!UseCompressedOops) {
1492 if (UseCompressedClassPointers) {
1493 warning("UseCompressedClassPointers requires UseCompressedOops");
1494 }
1495 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1496 } else {
1497 // Turn on UseCompressedClassPointers too
1498 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1499 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1500 }
1501 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1502 if (UseCompressedClassPointers) {
1503 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1504 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1505 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1506 }
1507 }
1508 }
1509 #endif // _LP64
1510 #endif // !ZERO
1511 }
1512
1513 void Arguments::set_conservative_max_heap_alignment() {
1514 // The conservative maximum required alignment for the heap is the maximum of
1515 // the alignments imposed by several sources: any requirements from the heap
1516 // itself, the collector policy and the maximum page size we may run the VM
1517 // with.
1518 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1519 #if INCLUDE_ALL_GCS
1520 if (UseParallelGC) {
1521 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1522 } else if (UseG1GC) {
1523 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1524 }
1525 #endif // INCLUDE_ALL_GCS
1526 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(),
1527 CollectorPolicy::compute_heap_alignment());
1528 }
1529
1530 void Arguments::set_ergonomics_flags() {
1531
1532 if (os::is_server_class_machine()) {
1533 // If no other collector is requested explicitly,
1534 // let the VM select the collector based on
1535 // machine class and automatic selection policy.
1536 if (!UseSerialGC &&
1537 !UseConcMarkSweepGC &&
1538 !UseG1GC &&
1539 !UseParNewGC &&
1540 FLAG_IS_DEFAULT(UseParallelGC)) {
1541 if (should_auto_select_low_pause_collector()) {
1542 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1543 } else {
1544 FLAG_SET_ERGO(bool, UseParallelGC, true);
1545 }
1546 }
1547 }
1548 #ifdef COMPILER2
1549 // Shared spaces work fine with other GCs but causes bytecode rewriting
1550 // to be disabled, which hurts interpreter performance and decreases
1551 // server performance. When -server is specified, keep the default off
1552 // unless it is asked for. Future work: either add bytecode rewriting
1553 // at link time, or rewrite bytecodes in non-shared methods.
1554 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1555 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1556 no_shared_spaces();
1557 }
1558 #endif
1559
1560 set_conservative_max_heap_alignment();
1561
1562 #ifndef ZERO
1563 #ifdef _LP64
1564 set_use_compressed_oops();
1565
1566 // set_use_compressed_klass_ptrs() must be called after calling
1567 // set_use_compressed_oops().
1568 set_use_compressed_klass_ptrs();
1569
1570 // Also checks that certain machines are slower with compressed oops
1571 // in vm_version initialization code.
1572 #endif // _LP64
1573 #endif // !ZERO
1574 }
1575
1576 void Arguments::set_parallel_gc_flags() {
1577 assert(UseParallelGC || UseParallelOldGC, "Error");
1578 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1579 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1580 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1581 }
1582 FLAG_SET_DEFAULT(UseParallelGC, true);
1583
1584 // If no heap maximum was requested explicitly, use some reasonable fraction
1585 // of the physical memory, up to a maximum of 1GB.
1586 FLAG_SET_DEFAULT(ParallelGCThreads,
1587 Abstract_VM_Version::parallel_worker_threads());
1588 if (ParallelGCThreads == 0) {
1589 jio_fprintf(defaultStream::error_stream(),
1590 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1591 vm_exit(1);
1592 }
1593
1594 if (UseAdaptiveSizePolicy) {
1595 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1596 // unless the user actually sets these flags.
1597 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1598 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1599 }
1600 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1601 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1602 }
1603 }
1604
1605 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1606 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1607 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1608 // See CR 6362902 for details.
1609 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1610 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1611 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1612 }
1613 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1614 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1615 }
1616 }
1617
1618 if (UseParallelOldGC) {
1619 // Par compact uses lower default values since they are treated as
1620 // minimums. These are different defaults because of the different
1621 // interpretation and are not ergonomically set.
1622 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1623 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1624 }
1625 }
1626 }
1627
1628 void Arguments::set_g1_gc_flags() {
1629 assert(UseG1GC, "Error");
1630 #ifdef COMPILER1
1631 FastTLABRefill = false;
1632 #endif
1633 FLAG_SET_DEFAULT(ParallelGCThreads,
1634 Abstract_VM_Version::parallel_worker_threads());
1635 if (ParallelGCThreads == 0) {
1636 FLAG_SET_DEFAULT(ParallelGCThreads,
1637 Abstract_VM_Version::parallel_worker_threads());
1638 }
1639
1640 // MarkStackSize will be set (if it hasn't been set by the user)
1641 // when concurrent marking is initialized.
1642 // Its value will be based upon the number of parallel marking threads.
1643 // But we do set the maximum mark stack size here.
1644 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1645 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1646 }
1647
1648 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1649 // In G1, we want the default GC overhead goal to be higher than
1650 // say in PS. So we set it here to 10%. Otherwise the heap might
1651 // be expanded more aggressively than we would like it to. In
1652 // fact, even 10% seems to not be high enough in some cases
1653 // (especially small GC stress tests that the main thing they do
1654 // is allocation). We might consider increase it further.
1655 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1656 }
1657
1658 if (PrintGCDetails && Verbose) {
1659 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1660 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1661 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1662 }
1663 }
1664
1665 julong Arguments::limit_by_allocatable_memory(julong limit) {
1666 julong max_allocatable;
1667 julong result = limit;
1668 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1669 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1670 }
1671 return result;
1672 }
1673
1674 // Use static initialization to get the default before parsing
1675 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1676
1677 void Arguments::set_heap_size() {
1678 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1679 // Deprecated flag
1680 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1681 }
1682
1683 const julong phys_mem =
1684 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1685 : (julong)MaxRAM;
1686
1687 // If the maximum heap size has not been set with -Xmx,
1688 // then set it as fraction of the size of physical memory,
1689 // respecting the maximum and minimum sizes of the heap.
1690 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1691 julong reasonable_max = phys_mem / MaxRAMFraction;
1692
1693 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1694 // Small physical memory, so use a minimum fraction of it for the heap
1695 reasonable_max = phys_mem / MinRAMFraction;
1696 } else {
1697 // Not-small physical memory, so require a heap at least
1698 // as large as MaxHeapSize
1699 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1700 }
1701 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1702 // Limit the heap size to ErgoHeapSizeLimit
1703 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1704 }
1705 if (UseCompressedOops) {
1706 // Limit the heap size to the maximum possible when using compressed oops
1707 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1708
1709 // HeapBaseMinAddress can be greater than default but not less than.
1710 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1711 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1712 // matches compressed oops printing flags
1713 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1714 jio_fprintf(defaultStream::error_stream(),
1715 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1716 " (" UINTX_FORMAT "G) which is greater than value given "
1717 UINTX_FORMAT "\n",
1718 DefaultHeapBaseMinAddress,
1719 DefaultHeapBaseMinAddress/G,
1720 HeapBaseMinAddress);
1721 }
1722 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1723 }
1724 }
1725
1726 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1727 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1728 // but it should be not less than default MaxHeapSize.
1729 max_coop_heap -= HeapBaseMinAddress;
1730 }
1731 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1732 }
1733 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1734
1735 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1736 // An initial heap size was specified on the command line,
1737 // so be sure that the maximum size is consistent. Done
1738 // after call to limit_by_allocatable_memory because that
1739 // method might reduce the allocation size.
1740 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1741 }
1742
1743 if (PrintGCDetails && Verbose) {
1744 // Cannot use gclog_or_tty yet.
1745 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1746 }
1747 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1748 }
1749
1750 // If the minimum or initial heap_size have not been set or requested to be set
1751 // ergonomically, set them accordingly.
1752 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1753 julong reasonable_minimum = (julong)(OldSize + NewSize);
1754
1755 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1756
1757 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1758
1759 if (InitialHeapSize == 0) {
1760 julong reasonable_initial = phys_mem / InitialRAMFraction;
1761
1762 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1763 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1764
1765 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1766
1767 if (PrintGCDetails && Verbose) {
1768 // Cannot use gclog_or_tty yet.
1769 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1770 }
1771 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1772 }
1773 // If the minimum heap size has not been set (via -Xms),
1774 // synchronize with InitialHeapSize to avoid errors with the default value.
1775 if (min_heap_size() == 0) {
1776 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1777 if (PrintGCDetails && Verbose) {
1778 // Cannot use gclog_or_tty yet.
1779 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1780 }
1781 }
1782 }
1783 }
1784
1785 // This must be called after ergonomics because we want bytecode rewriting
1786 // if the server compiler is used, or if UseSharedSpaces is disabled.
1787 void Arguments::set_bytecode_flags() {
1788 // Better not attempt to store into a read-only space.
1789 if (UseSharedSpaces) {
1790 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1791 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1792 }
1793
1794 if (!RewriteBytecodes) {
1795 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1796 }
1797 }
1798
1799 // Aggressive optimization flags -XX:+AggressiveOpts
1800 void Arguments::set_aggressive_opts_flags() {
1801 #ifdef COMPILER2
1802 if (AggressiveUnboxing) {
1803 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1804 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1805 } else if (!EliminateAutoBox) {
1806 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1807 AggressiveUnboxing = false;
1808 }
1809 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1810 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1811 } else if (!DoEscapeAnalysis) {
1812 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1813 AggressiveUnboxing = false;
1814 }
1815 }
1816 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1817 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1818 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1819 }
1820 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1821 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1822 }
1823
1824 // Feed the cache size setting into the JDK
1825 char buffer[1024];
1826 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1827 add_property(buffer);
1828 }
1829 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1830 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1831 }
1832 #endif
1833
1834 if (AggressiveOpts) {
1835 // Sample flag setting code
1836 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1837 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1838 // }
1839 }
1840 }
1841
1842 //===========================================================================================================
1843 // Parsing of java.compiler property
1844
1845 void Arguments::process_java_compiler_argument(char* arg) {
1846 // For backwards compatibility, Djava.compiler=NONE or ""
1847 // causes us to switch to -Xint mode UNLESS -Xdebug
1848 // is also specified.
1849 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1850 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1851 }
1852 }
1853
1854 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1855 _sun_java_launcher = strdup(launcher);
1856 }
1857
1858 bool Arguments::created_by_java_launcher() {
1859 assert(_sun_java_launcher != NULL, "property must have value");
1860 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1861 }
1862
1863 bool Arguments::sun_java_launcher_is_altjvm() {
1864 return _sun_java_launcher_is_altjvm;
1865 }
1866
1867 //===========================================================================================================
1868 // Parsing of main arguments
1869
1870 bool Arguments::verify_interval(uintx val, uintx min,
1871 uintx max, const char* name) {
1872 // Returns true iff value is in the inclusive interval [min..max]
1873 // false, otherwise.
1874 if (val >= min && val <= max) {
1875 return true;
1876 }
1877 jio_fprintf(defaultStream::error_stream(),
1878 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1879 " and " UINTX_FORMAT "\n",
1880 name, val, min, max);
1881 return false;
1882 }
1883
1884 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1885 // Returns true if given value is at least specified min threshold
1886 // false, otherwise.
1887 if (val >= min ) {
1888 return true;
1889 }
1890 jio_fprintf(defaultStream::error_stream(),
1891 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1892 name, val, min);
1893 return false;
1894 }
1895
1896 bool Arguments::verify_percentage(uintx value, const char* name) {
1897 if (is_percentage(value)) {
1898 return true;
1899 }
1900 jio_fprintf(defaultStream::error_stream(),
1901 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1902 name, value);
1903 return false;
1904 }
1905
1906 #if !INCLUDE_ALL_GCS
1907 #ifdef ASSERT
1908 static bool verify_serial_gc_flags() {
1909 return (UseSerialGC &&
1910 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1911 UseParallelGC || UseParallelOldGC));
1912 }
1913 #endif // ASSERT
1914 #endif // INCLUDE_ALL_GCS
1915
1916 // check if do gclog rotation
1917 // +UseGCLogFileRotation is a must,
1918 // no gc log rotation when log file not supplied or
1919 // NumberOfGCLogFiles is 0
1920 void check_gclog_consistency() {
1921 if (UseGCLogFileRotation) {
1922 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1923 jio_fprintf(defaultStream::output_stream(),
1924 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1925 "where num_of_file > 0\n"
1926 "GC log rotation is turned off\n");
1927 UseGCLogFileRotation = false;
1928 }
1929 }
1930
1931 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1932 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1933 jio_fprintf(defaultStream::output_stream(),
1934 "GCLogFileSize changed to minimum 8K\n");
1935 }
1936 }
1937
1938 // This function is called for -Xloggc:<filename>, it can be used
1939 // to check if a given file name(or string) conforms to the following
1940 // specification:
1941 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1942 // %p and %t only allowed once. We only limit usage of filename not path
1943 bool is_filename_valid(const char *file_name) {
1944 const char* p = file_name;
1945 char file_sep = os::file_separator()[0];
1946 const char* cp;
1947 // skip prefix path
1948 for (cp = file_name; *cp != '\0'; cp++) {
1949 if (*cp == '/' || *cp == file_sep) {
1950 p = cp + 1;
1951 }
1952 }
1953
1954 int count_p = 0;
1955 int count_t = 0;
1956 while (*p != '\0') {
1957 if ((*p >= '0' && *p <= '9') ||
1958 (*p >= 'A' && *p <= 'Z') ||
1959 (*p >= 'a' && *p <= 'z') ||
1960 *p == '-' ||
1961 *p == '_' ||
1962 *p == '.') {
1963 p++;
1964 continue;
1965 }
1966 if (*p == '%') {
1967 if(*(p + 1) == 'p') {
1968 p += 2;
1969 count_p ++;
1970 continue;
1971 }
1972 if (*(p + 1) == 't') {
1973 p += 2;
1974 count_t ++;
1975 continue;
1976 }
1977 }
1978 return false;
1979 }
1980 return count_p < 2 && count_t < 2;
1981 }
1982
1983 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
1984 if (!is_percentage(min_heap_free_ratio)) {
1985 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
1986 return false;
1987 }
1988 if (min_heap_free_ratio > MaxHeapFreeRatio) {
1989 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1990 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
1991 MaxHeapFreeRatio);
1992 return false;
1993 }
1994 return true;
1995 }
1996
1997 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
1998 if (!is_percentage(max_heap_free_ratio)) {
1999 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2000 return false;
2001 }
2002 if (max_heap_free_ratio < MinHeapFreeRatio) {
2003 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2004 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2005 MinHeapFreeRatio);
2006 return false;
2007 }
2008 return true;
2009 }
2010
2011 // Check consistency of GC selection
2012 bool Arguments::check_gc_consistency() {
2013 check_gclog_consistency();
2014 bool status = true;
2015 // Ensure that the user has not selected conflicting sets
2016 // of collectors. [Note: this check is merely a user convenience;
2017 // collectors over-ride each other so that only a non-conflicting
2018 // set is selected; however what the user gets is not what they
2019 // may have expected from the combination they asked for. It's
2020 // better to reduce user confusion by not allowing them to
2021 // select conflicting combinations.
2022 uint i = 0;
2023 if (UseSerialGC) i++;
2024 if (UseConcMarkSweepGC || UseParNewGC) i++;
2025 if (UseParallelGC || UseParallelOldGC) i++;
2026 if (UseG1GC) i++;
2027 if (i > 1) {
2028 jio_fprintf(defaultStream::error_stream(),
2029 "Conflicting collector combinations in option list; "
2030 "please refer to the release notes for the combinations "
2031 "allowed\n");
2032 status = false;
2033 }
2034 return status;
2035 }
2036
2037 void Arguments::check_deprecated_gcs() {
2038 if (UseConcMarkSweepGC && !UseParNewGC) {
2039 warning("Using the DefNew young collector with the CMS collector is deprecated "
2040 "and will likely be removed in a future release");
2041 }
2042
2043 if (UseParNewGC && !UseConcMarkSweepGC) {
2044 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2045 // set up UseSerialGC properly, so that can't be used in the check here.
2046 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2047 "and will likely be removed in a future release");
2048 }
2049
2050 if (CMSIncrementalMode) {
2051 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2052 }
2053 }
2054
2055 void Arguments::check_deprecated_gc_flags() {
2056 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2057 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2058 "and will likely be removed in future release");
2059 }
2060 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2061 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2062 "Use MaxRAMFraction instead.");
2063 }
2064 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2065 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2066 }
2067 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2068 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2069 }
2070 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2071 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2072 }
2073 }
2074
2075 // Check stack pages settings
2076 bool Arguments::check_stack_pages()
2077 {
2078 bool status = true;
2079 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2080 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2081 // greater stack shadow pages can't generate instruction to bang stack
2082 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2083 return status;
2084 }
2085
2086 // Check the consistency of vm_init_args
2087 bool Arguments::check_vm_args_consistency() {
2088 // Method for adding checks for flag consistency.
2089 // The intent is to warn the user of all possible conflicts,
2090 // before returning an error.
2091 // Note: Needs platform-dependent factoring.
2092 bool status = true;
2093
2094 if (TLABRefillWasteFraction == 0) {
2095 jio_fprintf(defaultStream::error_stream(),
2096 "TLABRefillWasteFraction should be a denominator, "
2097 "not " SIZE_FORMAT "\n",
2098 TLABRefillWasteFraction);
2099 status = false;
2100 }
2101
2102 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2103 "AdaptiveSizePolicyWeight");
2104 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2105
2106 // Divide by bucket size to prevent a large size from causing rollover when
2107 // calculating amount of memory needed to be allocated for the String table.
2108 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2109 (max_uintx / StringTable::bucket_size()), "StringTable size");
2110
2111 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2112 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2113
2114 {
2115 // Using "else if" below to avoid printing two error messages if min > max.
2116 // This will also prevent us from reporting both min>100 and max>100 at the
2117 // same time, but that is less annoying than printing two identical errors IMHO.
2118 FormatBuffer<80> err_msg("%s","");
2119 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2120 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2121 status = false;
2122 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2123 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2124 status = false;
2125 }
2126 }
2127
2128 // Min/MaxMetaspaceFreeRatio
2129 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2130 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2131
2132 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2133 jio_fprintf(defaultStream::error_stream(),
2134 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2135 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2136 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2137 MinMetaspaceFreeRatio,
2138 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2139 MaxMetaspaceFreeRatio);
2140 status = false;
2141 }
2142
2143 // Trying to keep 100% free is not practical
2144 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2145
2146 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2147 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2148 }
2149
2150 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2151 // Settings to encourage splitting.
2152 if (!FLAG_IS_CMDLINE(NewRatio)) {
2153 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2154 }
2155 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2156 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2157 }
2158 }
2159
2160 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2161 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2162 if (GCTimeLimit == 100) {
2163 // Turn off gc-overhead-limit-exceeded checks
2164 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2165 }
2166
2167 status = status && check_gc_consistency();
2168 status = status && check_stack_pages();
2169
2170 if (CMSIncrementalMode) {
2171 if (!UseConcMarkSweepGC) {
2172 jio_fprintf(defaultStream::error_stream(),
2173 "error: invalid argument combination.\n"
2174 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2175 "selected in order\nto use CMSIncrementalMode.\n");
2176 status = false;
2177 } else {
2178 status = status && verify_percentage(CMSIncrementalDutyCycle,
2179 "CMSIncrementalDutyCycle");
2180 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2181 "CMSIncrementalDutyCycleMin");
2182 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2183 "CMSIncrementalSafetyFactor");
2184 status = status && verify_percentage(CMSIncrementalOffset,
2185 "CMSIncrementalOffset");
2186 status = status && verify_percentage(CMSExpAvgFactor,
2187 "CMSExpAvgFactor");
2188 // If it was not set on the command line, set
2189 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2190 if (CMSInitiatingOccupancyFraction < 0) {
2191 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2192 }
2193 }
2194 }
2195
2196 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2197 // insists that we hold the requisite locks so that the iteration is
2198 // MT-safe. For the verification at start-up and shut-down, we don't
2199 // yet have a good way of acquiring and releasing these locks,
2200 // which are not visible at the CollectedHeap level. We want to
2201 // be able to acquire these locks and then do the iteration rather
2202 // than just disable the lock verification. This will be fixed under
2203 // bug 4788986.
2204 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2205 if (VerifyDuringStartup) {
2206 warning("Heap verification at start-up disabled "
2207 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2208 VerifyDuringStartup = false; // Disable verification at start-up
2209 }
2210
2211 if (VerifyBeforeExit) {
2212 warning("Heap verification at shutdown disabled "
2213 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2214 VerifyBeforeExit = false; // Disable verification at shutdown
2215 }
2216 }
2217
2218 // Note: only executed in non-PRODUCT mode
2219 if (!UseAsyncConcMarkSweepGC &&
2220 (ExplicitGCInvokesConcurrent ||
2221 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2222 jio_fprintf(defaultStream::error_stream(),
2223 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2224 " with -UseAsyncConcMarkSweepGC");
2225 status = false;
2226 }
2227
2228 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2229
2230 #if INCLUDE_ALL_GCS
2231 if (UseG1GC) {
2232 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2233 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2234 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2235
2236 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2237 "InitiatingHeapOccupancyPercent");
2238 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2239 "G1RefProcDrainInterval");
2240 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2241 "G1ConcMarkStepDurationMillis");
2242 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2243 "G1ConcRSHotCardLimit");
2244 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2245 "G1ConcRSLogCacheSize");
2246 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2247 "StringDeduplicationAgeThreshold");
2248 }
2249 if (UseConcMarkSweepGC) {
2250 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2251 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2252 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2253 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2254
2255 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2256
2257 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2258 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2259 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2260
2261 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2262
2263 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2264 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2265
2266 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2267 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2268 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2269
2270 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2271
2272 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2273
2274 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2275 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2276 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2277 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2278 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2279 }
2280
2281 if (UseParallelGC || UseParallelOldGC) {
2282 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2283 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2284
2285 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2286 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2287
2288 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2289 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2290
2291 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2292
2293 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2294 }
2295 #endif // INCLUDE_ALL_GCS
2296
2297 status = status && verify_interval(RefDiscoveryPolicy,
2298 ReferenceProcessor::DiscoveryPolicyMin,
2299 ReferenceProcessor::DiscoveryPolicyMax,
2300 "RefDiscoveryPolicy");
2301
2302 // Limit the lower bound of this flag to 1 as it is used in a division
2303 // expression.
2304 status = status && verify_interval(TLABWasteTargetPercent,
2305 1, 100, "TLABWasteTargetPercent");
2306
2307 status = status && verify_object_alignment();
2308
2309 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2310 "CompressedClassSpaceSize");
2311
2312 status = status && verify_interval(MarkStackSizeMax,
2313 1, (max_jint - 1), "MarkStackSizeMax");
2314 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2315
2316 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2317
2318 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2319
2320 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2321
2322 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2323 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2324
2325 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2326
2327 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2328 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2329 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2330 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2331
2332 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2333 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2334
2335 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2336 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2337 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2338
2339 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2340 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2341
2342 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2343 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2344 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2345 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2346
2347 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2348
2349 if (PrintNMTStatistics) {
2350 #if INCLUDE_NMT
2351 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2352 #endif // INCLUDE_NMT
2353 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2354 PrintNMTStatistics = false;
2355 #if INCLUDE_NMT
2356 }
2357 #endif
2358 }
2359
2360 // Need to limit the extent of the padding to reasonable size.
2361 // 8K is well beyond the reasonable HW cache line size, even with the
2362 // aggressive prefetching, while still leaving the room for segregating
2363 // among the distinct pages.
2364 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2365 jio_fprintf(defaultStream::error_stream(),
2366 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2367 ContendedPaddingWidth, 0, 8192);
2368 status = false;
2369 }
2370
2371 // Need to enforce the padding not to break the existing field alignments.
2372 // It is sufficient to check against the largest type size.
2373 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2374 jio_fprintf(defaultStream::error_stream(),
2375 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2376 ContendedPaddingWidth, BytesPerLong);
2377 status = false;
2378 }
2379
2380 // Check lower bounds of the code cache
2381 // Template Interpreter code is approximately 3X larger in debug builds.
2382 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2383 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2384 jio_fprintf(defaultStream::error_stream(),
2385 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2386 os::vm_page_size()/K);
2387 status = false;
2388 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2389 jio_fprintf(defaultStream::error_stream(),
2390 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2391 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2392 status = false;
2393 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2394 jio_fprintf(defaultStream::error_stream(),
2395 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2396 min_code_cache_size/K);
2397 status = false;
2398 } else if (ReservedCodeCacheSize > 2*G) {
2399 // Code cache size larger than MAXINT is not supported.
2400 jio_fprintf(defaultStream::error_stream(),
2401 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2402 (2*G)/M);
2403 status = false;
2404 }
2405
2406 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2407 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2408 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2409 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2410
2411 // TieredCompilation needs at least 2 compiler threads.
2412 const int num_min_compiler_threads = (TieredCompilation && (TieredStopAtLevel >= CompLevel_full_optimization)) ? 2 : CI_COMPILER_COUNT;
2413 status &=verify_min_value(CICompilerCount, num_min_compiler_threads, "CICompilerCount");
2414
2415 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2416 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2417 }
2418
2419 return status;
2420 }
2421
2422 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2423 const char* option_type) {
2424 if (ignore) return false;
2425
2426 const char* spacer = " ";
2427 if (option_type == NULL) {
2428 option_type = ++spacer; // Set both to the empty string.
2429 }
2430
2431 if (os::obsolete_option(option)) {
2432 jio_fprintf(defaultStream::error_stream(),
2433 "Obsolete %s%soption: %s\n", option_type, spacer,
2434 option->optionString);
2435 return false;
2436 } else {
2437 jio_fprintf(defaultStream::error_stream(),
2438 "Unrecognized %s%soption: %s\n", option_type, spacer,
2439 option->optionString);
2440 return true;
2441 }
2442 }
2443
2444 static const char* user_assertion_options[] = {
2445 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2446 };
2447
2448 static const char* system_assertion_options[] = {
2449 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2450 };
2451
2452 // Return true if any of the strings in null-terminated array 'names' matches.
2453 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2454 // the option must match exactly.
2455 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2456 bool tail_allowed) {
2457 for (/* empty */; *names != NULL; ++names) {
2458 if (match_option(option, *names, tail)) {
2459 if (**tail == '\0' || tail_allowed && **tail == ':') {
2460 return true;
2461 }
2462 }
2463 }
2464 return false;
2465 }
2466
2467 bool Arguments::parse_uintx(const char* value,
2468 uintx* uintx_arg,
2469 uintx min_size) {
2470
2471 // Check the sign first since atomull() parses only unsigned values.
2472 bool value_is_positive = !(*value == '-');
2473
2474 if (value_is_positive) {
2475 julong n;
2476 bool good_return = atomull(value, &n);
2477 if (good_return) {
2478 bool above_minimum = n >= min_size;
2479 bool value_is_too_large = n > max_uintx;
2480
2481 if (above_minimum && !value_is_too_large) {
2482 *uintx_arg = n;
2483 return true;
2484 }
2485 }
2486 }
2487 return false;
2488 }
2489
2490 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2491 julong* long_arg,
2492 julong min_size) {
2493 if (!atomull(s, long_arg)) return arg_unreadable;
2494 return check_memory_size(*long_arg, min_size);
2495 }
2496
2497 // Parse JavaVMInitArgs structure
2498
2499 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2500 // For components of the system classpath.
2501 SysClassPath scp(Arguments::get_sysclasspath());
2502 bool scp_assembly_required = false;
2503
2504 // Save default settings for some mode flags
2505 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2506 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2507 Arguments::_ClipInlining = ClipInlining;
2508 Arguments::_BackgroundCompilation = BackgroundCompilation;
2509
2510 // Setup flags for mixed which is the default
2511 set_mode_flags(_mixed);
2512
2513 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2514 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2515 if (result != JNI_OK) {
2516 return result;
2517 }
2518
2519 // Parse JavaVMInitArgs structure passed in
2520 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2521 if (result != JNI_OK) {
2522 return result;
2523 }
2524
2525 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2526 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2527 if (result != JNI_OK) {
2528 return result;
2529 }
2530
2531 // Do final processing now that all arguments have been parsed
2532 result = finalize_vm_init_args(&scp, scp_assembly_required);
2533 if (result != JNI_OK) {
2534 return result;
2535 }
2536
2537 return JNI_OK;
2538 }
2539
2540 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2541 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2542 // are dealing with -agentpath (case where name is a path), otherwise with
2543 // -agentlib
2544 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2545 char *_name;
2546 const char *_hprof = "hprof", *_jdwp = "jdwp";
2547 size_t _len_hprof, _len_jdwp, _len_prefix;
2548
2549 if (is_path) {
2550 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2551 return false;
2552 }
2553
2554 _name++; // skip past last path separator
2555 _len_prefix = strlen(JNI_LIB_PREFIX);
2556
2557 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2558 return false;
2559 }
2560
2561 _name += _len_prefix;
2562 _len_hprof = strlen(_hprof);
2563 _len_jdwp = strlen(_jdwp);
2564
2565 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2566 _name += _len_hprof;
2567 }
2568 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2569 _name += _len_jdwp;
2570 }
2571 else {
2572 return false;
2573 }
2574
2575 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2576 return false;
2577 }
2578
2579 return true;
2580 }
2581
2582 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2583 return true;
2584 }
2585
2586 return false;
2587 }
2588
2589 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2590 SysClassPath* scp_p,
2591 bool* scp_assembly_required_p,
2592 Flag::Flags origin) {
2593 // Remaining part of option string
2594 const char* tail;
2595
2596 // iterate over arguments
2597 for (int index = 0; index < args->nOptions; index++) {
2598 bool is_absolute_path = false; // for -agentpath vs -agentlib
2599
2600 const JavaVMOption* option = args->options + index;
2601
2602 if (!match_option(option, "-Djava.class.path", &tail) &&
2603 !match_option(option, "-Dsun.java.command", &tail) &&
2604 !match_option(option, "-Dsun.java.launcher", &tail)) {
2605
2606 // add all jvm options to the jvm_args string. This string
2607 // is used later to set the java.vm.args PerfData string constant.
2608 // the -Djava.class.path and the -Dsun.java.command options are
2609 // omitted from jvm_args string as each have their own PerfData
2610 // string constant object.
2611 build_jvm_args(option->optionString);
2612 }
2613
2614 // -verbose:[class/gc/jni]
2615 if (match_option(option, "-verbose", &tail)) {
2616 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2617 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2618 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2619 } else if (!strcmp(tail, ":gc")) {
2620 FLAG_SET_CMDLINE(bool, PrintGC, true);
2621 } else if (!strcmp(tail, ":jni")) {
2622 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2623 }
2624 // -da / -ea / -disableassertions / -enableassertions
2625 // These accept an optional class/package name separated by a colon, e.g.,
2626 // -da:java.lang.Thread.
2627 } else if (match_option(option, user_assertion_options, &tail, true)) {
2628 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2629 if (*tail == '\0') {
2630 JavaAssertions::setUserClassDefault(enable);
2631 } else {
2632 assert(*tail == ':', "bogus match by match_option()");
2633 JavaAssertions::addOption(tail + 1, enable);
2634 }
2635 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2636 } else if (match_option(option, system_assertion_options, &tail, false)) {
2637 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2638 JavaAssertions::setSystemClassDefault(enable);
2639 // -bootclasspath:
2640 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2641 scp_p->reset_path(tail);
2642 *scp_assembly_required_p = true;
2643 // -bootclasspath/a:
2644 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2645 scp_p->add_suffix(tail);
2646 *scp_assembly_required_p = true;
2647 // -bootclasspath/p:
2648 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2649 scp_p->add_prefix(tail);
2650 *scp_assembly_required_p = true;
2651 // -Xrun
2652 } else if (match_option(option, "-Xrun", &tail)) {
2653 if (tail != NULL) {
2654 const char* pos = strchr(tail, ':');
2655 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2656 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2657 name[len] = '\0';
2658
2659 char *options = NULL;
2660 if(pos != NULL) {
2661 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2662 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2663 }
2664 #if !INCLUDE_JVMTI
2665 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2666 jio_fprintf(defaultStream::error_stream(),
2667 "Profiling and debugging agents are not supported in this VM\n");
2668 return JNI_ERR;
2669 }
2670 #endif // !INCLUDE_JVMTI
2671 add_init_library(name, options);
2672 }
2673 // -agentlib and -agentpath
2674 } else if (match_option(option, "-agentlib:", &tail) ||
2675 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2676 if(tail != NULL) {
2677 const char* pos = strchr(tail, '=');
2678 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2679 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2680 name[len] = '\0';
2681
2682 char *options = NULL;
2683 if(pos != NULL) {
2684 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2685 }
2686 #if !INCLUDE_JVMTI
2687 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2688 jio_fprintf(defaultStream::error_stream(),
2689 "Profiling and debugging agents are not supported in this VM\n");
2690 return JNI_ERR;
2691 }
2692 #endif // !INCLUDE_JVMTI
2693 add_init_agent(name, options, is_absolute_path);
2694 }
2695 // -javaagent
2696 } else if (match_option(option, "-javaagent:", &tail)) {
2697 #if !INCLUDE_JVMTI
2698 jio_fprintf(defaultStream::error_stream(),
2699 "Instrumentation agents are not supported in this VM\n");
2700 return JNI_ERR;
2701 #else
2702 if(tail != NULL) {
2703 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2704 add_init_agent("instrument", options, false);
2705 }
2706 #endif // !INCLUDE_JVMTI
2707 // -Xnoclassgc
2708 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2709 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2710 // -Xincgc: i-CMS
2711 } else if (match_option(option, "-Xincgc", &tail)) {
2712 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2713 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2714 // -Xnoincgc: no i-CMS
2715 } else if (match_option(option, "-Xnoincgc", &tail)) {
2716 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2717 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2718 // -Xconcgc
2719 } else if (match_option(option, "-Xconcgc", &tail)) {
2720 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2721 // -Xnoconcgc
2722 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2723 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2724 // -Xbatch
2725 } else if (match_option(option, "-Xbatch", &tail)) {
2726 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2727 // -Xmn for compatibility with other JVM vendors
2728 } else if (match_option(option, "-Xmn", &tail)) {
2729 julong long_initial_young_size = 0;
2730 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2731 if (errcode != arg_in_range) {
2732 jio_fprintf(defaultStream::error_stream(),
2733 "Invalid initial young generation size: %s\n", option->optionString);
2734 describe_range_error(errcode);
2735 return JNI_EINVAL;
2736 }
2737 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2738 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2739 // -Xms
2740 } else if (match_option(option, "-Xms", &tail)) {
2741 julong long_initial_heap_size = 0;
2742 // an initial heap size of 0 means automatically determine
2743 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2744 if (errcode != arg_in_range) {
2745 jio_fprintf(defaultStream::error_stream(),
2746 "Invalid initial heap size: %s\n", option->optionString);
2747 describe_range_error(errcode);
2748 return JNI_EINVAL;
2749 }
2750 set_min_heap_size((uintx)long_initial_heap_size);
2751 // Currently the minimum size and the initial heap sizes are the same.
2752 // Can be overridden with -XX:InitialHeapSize.
2753 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2754 // -Xmx
2755 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2756 julong long_max_heap_size = 0;
2757 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2758 if (errcode != arg_in_range) {
2759 jio_fprintf(defaultStream::error_stream(),
2760 "Invalid maximum heap size: %s\n", option->optionString);
2761 describe_range_error(errcode);
2762 return JNI_EINVAL;
2763 }
2764 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2765 // Xmaxf
2766 } else if (match_option(option, "-Xmaxf", &tail)) {
2767 char* err;
2768 int maxf = (int)(strtod(tail, &err) * 100);
2769 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2770 jio_fprintf(defaultStream::error_stream(),
2771 "Bad max heap free percentage size: %s\n",
2772 option->optionString);
2773 return JNI_EINVAL;
2774 } else {
2775 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2776 }
2777 // Xminf
2778 } else if (match_option(option, "-Xminf", &tail)) {
2779 char* err;
2780 int minf = (int)(strtod(tail, &err) * 100);
2781 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2782 jio_fprintf(defaultStream::error_stream(),
2783 "Bad min heap free percentage size: %s\n",
2784 option->optionString);
2785 return JNI_EINVAL;
2786 } else {
2787 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2788 }
2789 // -Xss
2790 } else if (match_option(option, "-Xss", &tail)) {
2791 julong long_ThreadStackSize = 0;
2792 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2793 if (errcode != arg_in_range) {
2794 jio_fprintf(defaultStream::error_stream(),
2795 "Invalid thread stack size: %s\n", option->optionString);
2796 describe_range_error(errcode);
2797 return JNI_EINVAL;
2798 }
2799 // Internally track ThreadStackSize in units of 1024 bytes.
2800 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2801 round_to((int)long_ThreadStackSize, K) / K);
2802 // -Xoss
2803 } else if (match_option(option, "-Xoss", &tail)) {
2804 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2805 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2806 julong long_CodeCacheExpansionSize = 0;
2807 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2808 if (errcode != arg_in_range) {
2809 jio_fprintf(defaultStream::error_stream(),
2810 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2811 os::vm_page_size()/K);
2812 return JNI_EINVAL;
2813 }
2814 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2815 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2816 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2817 julong long_ReservedCodeCacheSize = 0;
2818
2819 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2820 if (errcode != arg_in_range) {
2821 jio_fprintf(defaultStream::error_stream(),
2822 "Invalid maximum code cache size: %s.\n", option->optionString);
2823 return JNI_EINVAL;
2824 }
2825 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2826 //-XX:IncreaseFirstTierCompileThresholdAt=
2827 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2828 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2829 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2830 jio_fprintf(defaultStream::error_stream(),
2831 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2832 option->optionString);
2833 return JNI_EINVAL;
2834 }
2835 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2836 // -green
2837 } else if (match_option(option, "-green", &tail)) {
2838 jio_fprintf(defaultStream::error_stream(),
2839 "Green threads support not available\n");
2840 return JNI_EINVAL;
2841 // -native
2842 } else if (match_option(option, "-native", &tail)) {
2843 // HotSpot always uses native threads, ignore silently for compatibility
2844 // -Xsqnopause
2845 } else if (match_option(option, "-Xsqnopause", &tail)) {
2846 // EVM option, ignore silently for compatibility
2847 // -Xrs
2848 } else if (match_option(option, "-Xrs", &tail)) {
2849 // Classic/EVM option, new functionality
2850 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2851 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2852 // change default internal VM signals used - lower case for back compat
2853 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2854 // -Xoptimize
2855 } else if (match_option(option, "-Xoptimize", &tail)) {
2856 // EVM option, ignore silently for compatibility
2857 // -Xprof
2858 } else if (match_option(option, "-Xprof", &tail)) {
2859 #if INCLUDE_FPROF
2860 _has_profile = true;
2861 #else // INCLUDE_FPROF
2862 jio_fprintf(defaultStream::error_stream(),
2863 "Flat profiling is not supported in this VM.\n");
2864 return JNI_ERR;
2865 #endif // INCLUDE_FPROF
2866 // -Xconcurrentio
2867 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2868 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2869 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2870 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2871 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2872 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2873
2874 // -Xinternalversion
2875 } else if (match_option(option, "-Xinternalversion", &tail)) {
2876 jio_fprintf(defaultStream::output_stream(), "%s\n",
2877 VM_Version::internal_vm_info_string());
2878 vm_exit(0);
2879 #ifndef PRODUCT
2880 // -Xprintflags
2881 } else if (match_option(option, "-Xprintflags", &tail)) {
2882 CommandLineFlags::printFlags(tty, false);
2883 vm_exit(0);
2884 #endif
2885 // -D
2886 } else if (match_option(option, "-D", &tail)) {
2887 if (!add_property(tail)) {
2888 return JNI_ENOMEM;
2889 }
2890 // Out of the box management support
2891 if (match_option(option, "-Dcom.sun.management", &tail)) {
2892 #if INCLUDE_MANAGEMENT
2893 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2894 #else
2895 jio_fprintf(defaultStream::output_stream(),
2896 "-Dcom.sun.management is not supported in this VM.\n");
2897 return JNI_ERR;
2898 #endif
2899 }
2900 // -Xint
2901 } else if (match_option(option, "-Xint", &tail)) {
2902 set_mode_flags(_int);
2903 // -Xmixed
2904 } else if (match_option(option, "-Xmixed", &tail)) {
2905 set_mode_flags(_mixed);
2906 // -Xcomp
2907 } else if (match_option(option, "-Xcomp", &tail)) {
2908 // for testing the compiler; turn off all flags that inhibit compilation
2909 set_mode_flags(_comp);
2910 // -Xshare:dump
2911 } else if (match_option(option, "-Xshare:dump", &tail)) {
2912 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2913 set_mode_flags(_int); // Prevent compilation, which creates objects
2914 // -Xshare:on
2915 } else if (match_option(option, "-Xshare:on", &tail)) {
2916 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2917 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2918 // -Xshare:auto
2919 } else if (match_option(option, "-Xshare:auto", &tail)) {
2920 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2921 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2922 // -Xshare:off
2923 } else if (match_option(option, "-Xshare:off", &tail)) {
2924 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2925 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2926 // -Xverify
2927 } else if (match_option(option, "-Xverify", &tail)) {
2928 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2929 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2930 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2931 } else if (strcmp(tail, ":remote") == 0) {
2932 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2933 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2934 } else if (strcmp(tail, ":none") == 0) {
2935 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2936 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2937 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2938 return JNI_EINVAL;
2939 }
2940 // -Xdebug
2941 } else if (match_option(option, "-Xdebug", &tail)) {
2942 // note this flag has been used, then ignore
2943 set_xdebug_mode(true);
2944 // -Xnoagent
2945 } else if (match_option(option, "-Xnoagent", &tail)) {
2946 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2947 } else if (match_option(option, "-Xboundthreads", &tail)) {
2948 // Bind user level threads to kernel threads (Solaris only)
2949 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2950 } else if (match_option(option, "-Xloggc:", &tail)) {
2951 // Redirect GC output to the file. -Xloggc:<filename>
2952 // ostream_init_log(), when called will use this filename
2953 // to initialize a fileStream.
2954 _gc_log_filename = strdup(tail);
2955 if (!is_filename_valid(_gc_log_filename)) {
2956 jio_fprintf(defaultStream::output_stream(),
2957 "Invalid file name for use with -Xloggc: Filename can only contain the "
2958 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2959 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2960 return JNI_EINVAL;
2961 }
2962 FLAG_SET_CMDLINE(bool, PrintGC, true);
2963 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2964
2965 // JNI hooks
2966 } else if (match_option(option, "-Xcheck", &tail)) {
2967 if (!strcmp(tail, ":jni")) {
2968 #if !INCLUDE_JNI_CHECK
2969 warning("JNI CHECKING is not supported in this VM");
2970 #else
2971 CheckJNICalls = true;
2972 #endif // INCLUDE_JNI_CHECK
2973 } else if (is_bad_option(option, args->ignoreUnrecognized,
2974 "check")) {
2975 return JNI_EINVAL;
2976 }
2977 } else if (match_option(option, "vfprintf", &tail)) {
2978 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2979 } else if (match_option(option, "exit", &tail)) {
2980 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2981 } else if (match_option(option, "abort", &tail)) {
2982 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2983 // -XX:+AggressiveHeap
2984 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2985
2986 // This option inspects the machine and attempts to set various
2987 // parameters to be optimal for long-running, memory allocation
2988 // intensive jobs. It is intended for machines with large
2989 // amounts of cpu and memory.
2990
2991 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2992 // VM, but we may not be able to represent the total physical memory
2993 // available (like having 8gb of memory on a box but using a 32bit VM).
2994 // Thus, we need to make sure we're using a julong for intermediate
2995 // calculations.
2996 julong initHeapSize;
2997 julong total_memory = os::physical_memory();
2998
2999 if (total_memory < (julong)256*M) {
3000 jio_fprintf(defaultStream::error_stream(),
3001 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3002 vm_exit(1);
3003 }
3004
3005 // The heap size is half of available memory, or (at most)
3006 // all of possible memory less 160mb (leaving room for the OS
3007 // when using ISM). This is the maximum; because adaptive sizing
3008 // is turned on below, the actual space used may be smaller.
3009
3010 initHeapSize = MIN2(total_memory / (julong)2,
3011 total_memory - (julong)160*M);
3012
3013 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3014
3015 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3016 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3017 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3018 // Currently the minimum size and the initial heap sizes are the same.
3019 set_min_heap_size(initHeapSize);
3020 }
3021 if (FLAG_IS_DEFAULT(NewSize)) {
3022 // Make the young generation 3/8ths of the total heap.
3023 FLAG_SET_CMDLINE(uintx, NewSize,
3024 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3025 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3026 }
3027
3028 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3029 FLAG_SET_DEFAULT(UseLargePages, true);
3030 #endif
3031
3032 // Increase some data structure sizes for efficiency
3033 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3034 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3035 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3036
3037 // See the OldPLABSize comment below, but replace 'after promotion'
3038 // with 'after copying'. YoungPLABSize is the size of the survivor
3039 // space per-gc-thread buffers. The default is 4kw.
3040 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3041
3042 // OldPLABSize is the size of the buffers in the old gen that
3043 // UseParallelGC uses to promote live data that doesn't fit in the
3044 // survivor spaces. At any given time, there's one for each gc thread.
3045 // The default size is 1kw. These buffers are rarely used, since the
3046 // survivor spaces are usually big enough. For specjbb, however, there
3047 // are occasions when there's lots of live data in the young gen
3048 // and we end up promoting some of it. We don't have a definite
3049 // explanation for why bumping OldPLABSize helps, but the theory
3050 // is that a bigger PLAB results in retaining something like the
3051 // original allocation order after promotion, which improves mutator
3052 // locality. A minor effect may be that larger PLABs reduce the
3053 // number of PLAB allocation events during gc. The value of 8kw
3054 // was arrived at by experimenting with specjbb.
3055 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3056
3057 // Enable parallel GC and adaptive generation sizing
3058 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3059 FLAG_SET_DEFAULT(ParallelGCThreads,
3060 Abstract_VM_Version::parallel_worker_threads());
3061
3062 // Encourage steady state memory management
3063 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3064
3065 // This appears to improve mutator locality
3066 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3067
3068 // Get around early Solaris scheduling bug
3069 // (affinity vs other jobs on system)
3070 // but disallow DR and offlining (5008695).
3071 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3072
3073 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3074 // and the last option wins.
3075 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3076 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3077 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3078 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3079 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3080 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3081 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3082 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3083 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3084 uintx max_tenuring_thresh = 0;
3085 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3086 jio_fprintf(defaultStream::error_stream(),
3087 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3088 }
3089 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3090
3091 if (MaxTenuringThreshold == 0) {
3092 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3093 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3094 } else {
3095 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3096 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3097 }
3098 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3099 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3100 jio_fprintf(defaultStream::error_stream(),
3101 "Please use CMSClassUnloadingEnabled in place of "
3102 "CMSPermGenSweepingEnabled in the future\n");
3103 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3104 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3105 jio_fprintf(defaultStream::error_stream(),
3106 "Please use -XX:+UseGCOverheadLimit in place of "
3107 "-XX:+UseGCTimeLimit in the future\n");
3108 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3109 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3110 jio_fprintf(defaultStream::error_stream(),
3111 "Please use -XX:-UseGCOverheadLimit in place of "
3112 "-XX:-UseGCTimeLimit in the future\n");
3113 // The TLE options are for compatibility with 1.3 and will be
3114 // removed without notice in a future release. These options
3115 // are not to be documented.
3116 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3117 // No longer used.
3118 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3119 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3120 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3121 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3122 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3123 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3124 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3125 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3126 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3127 // No longer used.
3128 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3129 julong long_tlab_size = 0;
3130 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3131 if (errcode != arg_in_range) {
3132 jio_fprintf(defaultStream::error_stream(),
3133 "Invalid TLAB size: %s\n", option->optionString);
3134 describe_range_error(errcode);
3135 return JNI_EINVAL;
3136 }
3137 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3138 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3139 // No longer used.
3140 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3141 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3142 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3143 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3144 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3145 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3146 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3147 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3148 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3149 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3150 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3151 #if defined(DTRACE_ENABLED)
3152 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3153 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3154 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3155 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3156 #else // defined(DTRACE_ENABLED)
3157 jio_fprintf(defaultStream::error_stream(),
3158 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3159 return JNI_EINVAL;
3160 #endif // defined(DTRACE_ENABLED)
3161 #ifdef ASSERT
3162 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3163 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3164 // disable scavenge before parallel mark-compact
3165 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3166 #endif
3167 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3168 julong cms_blocks_to_claim = (julong)atol(tail);
3169 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3170 jio_fprintf(defaultStream::error_stream(),
3171 "Please use -XX:OldPLABSize in place of "
3172 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3173 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3174 julong cms_blocks_to_claim = (julong)atol(tail);
3175 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3176 jio_fprintf(defaultStream::error_stream(),
3177 "Please use -XX:OldPLABSize in place of "
3178 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3179 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3180 julong old_plab_size = 0;
3181 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3182 if (errcode != arg_in_range) {
3183 jio_fprintf(defaultStream::error_stream(),
3184 "Invalid old PLAB size: %s\n", option->optionString);
3185 describe_range_error(errcode);
3186 return JNI_EINVAL;
3187 }
3188 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3189 jio_fprintf(defaultStream::error_stream(),
3190 "Please use -XX:OldPLABSize in place of "
3191 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3192 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3193 julong young_plab_size = 0;
3194 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3195 if (errcode != arg_in_range) {
3196 jio_fprintf(defaultStream::error_stream(),
3197 "Invalid young PLAB size: %s\n", option->optionString);
3198 describe_range_error(errcode);
3199 return JNI_EINVAL;
3200 }
3201 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3202 jio_fprintf(defaultStream::error_stream(),
3203 "Please use -XX:YoungPLABSize in place of "
3204 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3205 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3206 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3207 julong stack_size = 0;
3208 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3209 if (errcode != arg_in_range) {
3210 jio_fprintf(defaultStream::error_stream(),
3211 "Invalid mark stack size: %s\n", option->optionString);
3212 describe_range_error(errcode);
3213 return JNI_EINVAL;
3214 }
3215 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3216 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3217 julong max_stack_size = 0;
3218 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3219 if (errcode != arg_in_range) {
3220 jio_fprintf(defaultStream::error_stream(),
3221 "Invalid maximum mark stack size: %s\n",
3222 option->optionString);
3223 describe_range_error(errcode);
3224 return JNI_EINVAL;
3225 }
3226 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3227 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3228 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3229 uintx conc_threads = 0;
3230 if (!parse_uintx(tail, &conc_threads, 1)) {
3231 jio_fprintf(defaultStream::error_stream(),
3232 "Invalid concurrent threads: %s\n", option->optionString);
3233 return JNI_EINVAL;
3234 }
3235 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3236 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3237 julong max_direct_memory_size = 0;
3238 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3239 if (errcode != arg_in_range) {
3240 jio_fprintf(defaultStream::error_stream(),
3241 "Invalid maximum direct memory size: %s\n",
3242 option->optionString);
3243 describe_range_error(errcode);
3244 return JNI_EINVAL;
3245 }
3246 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3247 #if !INCLUDE_MANAGEMENT
3248 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3249 jio_fprintf(defaultStream::error_stream(),
3250 "ManagementServer is not supported in this VM.\n");
3251 return JNI_ERR;
3252 #endif // INCLUDE_MANAGEMENT
3253 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3254 // Skip -XX:Flags= since that case has already been handled
3255 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3256 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3257 return JNI_EINVAL;
3258 }
3259 }
3260 // Unknown option
3261 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3262 return JNI_ERR;
3263 }
3264 }
3265
3266 // Change the default value for flags which have different default values
3267 // when working with older JDKs.
3268 #ifdef LINUX
3269 if (JDK_Version::current().compare_major(6) <= 0 &&
3270 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3271 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3272 }
3273 #endif // LINUX
3274 return JNI_OK;
3275 }
3276
3277 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3278 // This must be done after all -D arguments have been processed.
3279 scp_p->expand_endorsed();
3280
3281 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3282 // Assemble the bootclasspath elements into the final path.
3283 Arguments::set_sysclasspath(scp_p->combined_path());
3284 }
3285
3286 // This must be done after all arguments have been processed.
3287 // java_compiler() true means set to "NONE" or empty.
3288 if (java_compiler() && !xdebug_mode()) {
3289 // For backwards compatibility, we switch to interpreted mode if
3290 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3291 // not specified.
3292 set_mode_flags(_int);
3293 }
3294 if (CompileThreshold == 0) {
3295 set_mode_flags(_int);
3296 }
3297
3298 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3299 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3300 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3301 }
3302
3303 #ifndef COMPILER2
3304 // Don't degrade server performance for footprint
3305 if (FLAG_IS_DEFAULT(UseLargePages) &&
3306 MaxHeapSize < LargePageHeapSizeThreshold) {
3307 // No need for large granularity pages w/small heaps.
3308 // Note that large pages are enabled/disabled for both the
3309 // Java heap and the code cache.
3310 FLAG_SET_DEFAULT(UseLargePages, false);
3311 }
3312
3313 #else
3314 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3315 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3316 }
3317 #endif
3318
3319 #ifndef TIERED
3320 // Tiered compilation is undefined.
3321 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3322 #endif
3323
3324 // If we are running in a headless jre, force java.awt.headless property
3325 // to be true unless the property has already been set.
3326 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3327 if (os::is_headless_jre()) {
3328 const char* headless = Arguments::get_property("java.awt.headless");
3329 if (headless == NULL) {
3330 char envbuffer[128];
3331 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3332 if (!add_property("java.awt.headless=true")) {
3333 return JNI_ENOMEM;
3334 }
3335 } else {
3336 char buffer[256];
3337 strcpy(buffer, "java.awt.headless=");
3338 strcat(buffer, envbuffer);
3339 if (!add_property(buffer)) {
3340 return JNI_ENOMEM;
3341 }
3342 }
3343 }
3344 }
3345
3346 if (!check_vm_args_consistency()) {
3347 return JNI_ERR;
3348 }
3349
3350 return JNI_OK;
3351 }
3352
3353 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3354 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3355 scp_assembly_required_p);
3356 }
3357
3358 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3359 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3360 scp_assembly_required_p);
3361 }
3362
3363 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3364 const int N_MAX_OPTIONS = 64;
3365 const int OPTION_BUFFER_SIZE = 1024;
3366 char buffer[OPTION_BUFFER_SIZE];
3367
3368 // The variable will be ignored if it exceeds the length of the buffer.
3369 // Don't check this variable if user has special privileges
3370 // (e.g. unix su command).
3371 if (os::getenv(name, buffer, sizeof(buffer)) &&
3372 !os::have_special_privileges()) {
3373 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3374 jio_fprintf(defaultStream::error_stream(),
3375 "Picked up %s: %s\n", name, buffer);
3376 char* rd = buffer; // pointer to the input string (rd)
3377 int i;
3378 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3379 while (isspace(*rd)) rd++; // skip whitespace
3380 if (*rd == 0) break; // we re done when the input string is read completely
3381
3382 // The output, option string, overwrites the input string.
3383 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3384 // input string (rd).
3385 char* wrt = rd;
3386
3387 options[i++].optionString = wrt; // Fill in option
3388 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3389 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3390 int quote = *rd; // matching quote to look for
3391 rd++; // don't copy open quote
3392 while (*rd != quote) { // include everything (even spaces) up until quote
3393 if (*rd == 0) { // string termination means unmatched string
3394 jio_fprintf(defaultStream::error_stream(),
3395 "Unmatched quote in %s\n", name);
3396 return JNI_ERR;
3397 }
3398 *wrt++ = *rd++; // copy to option string
3399 }
3400 rd++; // don't copy close quote
3401 } else {
3402 *wrt++ = *rd++; // copy to option string
3403 }
3404 }
3405 // Need to check if we're done before writing a NULL,
3406 // because the write could be to the byte that rd is pointing to.
3407 if (*rd++ == 0) {
3408 *wrt = 0;
3409 break;
3410 }
3411 *wrt = 0; // Zero terminate option
3412 }
3413 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3414 JavaVMInitArgs vm_args;
3415 vm_args.version = JNI_VERSION_1_2;
3416 vm_args.options = options;
3417 vm_args.nOptions = i;
3418 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3419
3420 if (PrintVMOptions) {
3421 const char* tail;
3422 for (int i = 0; i < vm_args.nOptions; i++) {
3423 const JavaVMOption *option = vm_args.options + i;
3424 if (match_option(option, "-XX:", &tail)) {
3425 logOption(tail);
3426 }
3427 }
3428 }
3429
3430 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3431 }
3432 return JNI_OK;
3433 }
3434
3435 void Arguments::set_shared_spaces_flags() {
3436 if (DumpSharedSpaces) {
3437 if (RequireSharedSpaces) {
3438 warning("cannot dump shared archive while using shared archive");
3439 }
3440 UseSharedSpaces = false;
3441 #ifdef _LP64
3442 if (!UseCompressedOops || !UseCompressedClassPointers) {
3443 vm_exit_during_initialization(
3444 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3445 }
3446 } else {
3447 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3448 if (!UseCompressedOops || !UseCompressedClassPointers) {
3449 no_shared_spaces();
3450 }
3451 #endif
3452 }
3453 }
3454
3455 #if !INCLUDE_ALL_GCS
3456 static void force_serial_gc() {
3457 FLAG_SET_DEFAULT(UseSerialGC, true);
3458 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3459 UNSUPPORTED_GC_OPTION(UseG1GC);
3460 UNSUPPORTED_GC_OPTION(UseParallelGC);
3461 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3462 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3463 UNSUPPORTED_GC_OPTION(UseParNewGC);
3464 }
3465 #endif // INCLUDE_ALL_GCS
3466
3467 // Sharing support
3468 // Construct the path to the archive
3469 static char* get_shared_archive_path() {
3470 char *shared_archive_path;
3471 if (SharedArchiveFile == NULL) {
3472 char jvm_path[JVM_MAXPATHLEN];
3473 os::jvm_path(jvm_path, sizeof(jvm_path));
3474 char *end = strrchr(jvm_path, *os::file_separator());
3475 if (end != NULL) *end = '\0';
3476 size_t jvm_path_len = strlen(jvm_path);
3477 size_t file_sep_len = strlen(os::file_separator());
3478 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3479 file_sep_len + 20, mtInternal);
3480 if (shared_archive_path != NULL) {
3481 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3482 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3483 strncat(shared_archive_path, "classes.jsa", 11);
3484 }
3485 } else {
3486 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3487 if (shared_archive_path != NULL) {
3488 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3489 }
3490 }
3491 return shared_archive_path;
3492 }
3493
3494 #ifndef PRODUCT
3495 // Determine whether LogVMOutput should be implicitly turned on.
3496 static bool use_vm_log() {
3497 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3498 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3499 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3500 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3501 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3502 return true;
3503 }
3504
3505 #ifdef COMPILER1
3506 if (PrintC1Statistics) {
3507 return true;
3508 }
3509 #endif // COMPILER1
3510
3511 #ifdef COMPILER2
3512 if (PrintOptoAssembly || PrintOptoStatistics) {
3513 return true;
3514 }
3515 #endif // COMPILER2
3516
3517 return false;
3518 }
3519 #endif // PRODUCT
3520
3521 // Parse entry point called from JNI_CreateJavaVM
3522
3523 jint Arguments::parse(const JavaVMInitArgs* args) {
3524
3525 // Remaining part of option string
3526 const char* tail;
3527
3528 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3529 const char* hotspotrc = ".hotspotrc";
3530 bool settings_file_specified = false;
3531 bool needs_hotspotrc_warning = false;
3532
3533 const char* flags_file;
3534 int index;
3535 for (index = 0; index < args->nOptions; index++) {
3536 const JavaVMOption *option = args->options + index;
3537 if (match_option(option, "-XX:Flags=", &tail)) {
3538 flags_file = tail;
3539 settings_file_specified = true;
3540 }
3541 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3542 PrintVMOptions = true;
3543 }
3544 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3545 PrintVMOptions = false;
3546 }
3547 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3548 IgnoreUnrecognizedVMOptions = true;
3549 }
3550 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3551 IgnoreUnrecognizedVMOptions = false;
3552 }
3553 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3554 CommandLineFlags::printFlags(tty, false);
3555 vm_exit(0);
3556 }
3557 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3558 #if INCLUDE_NMT
3559 MemTracker::init_tracking_options(tail);
3560 #else
3561 jio_fprintf(defaultStream::error_stream(),
3562 "Native Memory Tracking is not supported in this VM\n");
3563 return JNI_ERR;
3564 #endif
3565 }
3566
3567
3568 #ifndef PRODUCT
3569 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3570 CommandLineFlags::printFlags(tty, true);
3571 vm_exit(0);
3572 }
3573 #endif
3574 }
3575
3576 if (IgnoreUnrecognizedVMOptions) {
3577 // uncast const to modify the flag args->ignoreUnrecognized
3578 *(jboolean*)(&args->ignoreUnrecognized) = true;
3579 }
3580
3581 // Parse specified settings file
3582 if (settings_file_specified) {
3583 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3584 return JNI_EINVAL;
3585 }
3586 } else {
3587 #ifdef ASSERT
3588 // Parse default .hotspotrc settings file
3589 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3590 return JNI_EINVAL;
3591 }
3592 #else
3593 struct stat buf;
3594 if (os::stat(hotspotrc, &buf) == 0) {
3595 needs_hotspotrc_warning = true;
3596 }
3597 #endif
3598 }
3599
3600 if (PrintVMOptions) {
3601 for (index = 0; index < args->nOptions; index++) {
3602 const JavaVMOption *option = args->options + index;
3603 if (match_option(option, "-XX:", &tail)) {
3604 logOption(tail);
3605 }
3606 }
3607 }
3608
3609 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3610 jint result = parse_vm_init_args(args);
3611 if (result != JNI_OK) {
3612 return result;
3613 }
3614
3615 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3616 SharedArchivePath = get_shared_archive_path();
3617 if (SharedArchivePath == NULL) {
3618 return JNI_ENOMEM;
3619 }
3620
3621 // Delay warning until here so that we've had a chance to process
3622 // the -XX:-PrintWarnings flag
3623 if (needs_hotspotrc_warning) {
3624 warning("%s file is present but has been ignored. "
3625 "Run with -XX:Flags=%s to load the file.",
3626 hotspotrc, hotspotrc);
3627 }
3628
3629 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3630 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3631 #endif
3632
3633 #if INCLUDE_ALL_GCS
3634 #if (defined JAVASE_EMBEDDED || defined ARM)
3635 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3636 #endif
3637 #endif
3638
3639 #ifndef PRODUCT
3640 if (TraceBytecodesAt != 0) {
3641 TraceBytecodes = true;
3642 }
3643 if (CountCompiledCalls) {
3644 if (UseCounterDecay) {
3645 warning("UseCounterDecay disabled because CountCalls is set");
3646 UseCounterDecay = false;
3647 }
3648 }
3649 #endif // PRODUCT
3650
3651 if (ScavengeRootsInCode == 0) {
3652 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3653 warning("forcing ScavengeRootsInCode non-zero");
3654 }
3655 ScavengeRootsInCode = 1;
3656 }
3657
3658 if (PrintGCDetails) {
3659 // Turn on -verbose:gc options as well
3660 PrintGC = true;
3661 }
3662
3663 if (!JDK_Version::is_gte_jdk18x_version()) {
3664 // To avoid changing the log format for 7 updates this flag is only
3665 // true by default in JDK8 and above.
3666 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3667 FLAG_SET_DEFAULT(PrintGCCause, false);
3668 }
3669 }
3670
3671 // Set object alignment values.
3672 set_object_alignment();
3673
3674 #if !INCLUDE_ALL_GCS
3675 force_serial_gc();
3676 #endif // INCLUDE_ALL_GCS
3677 #if !INCLUDE_CDS
3678 if (DumpSharedSpaces || RequireSharedSpaces) {
3679 jio_fprintf(defaultStream::error_stream(),
3680 "Shared spaces are not supported in this VM\n");
3681 return JNI_ERR;
3682 }
3683 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3684 warning("Shared spaces are not supported in this VM");
3685 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3686 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3687 }
3688 no_shared_spaces();
3689 #endif // INCLUDE_CDS
3690
3691 return JNI_OK;
3692 }
3693
3694 jint Arguments::apply_ergo() {
3695
3696 // Set flags based on ergonomics.
3697 set_ergonomics_flags();
3698
3699 set_shared_spaces_flags();
3700
3701 // Check the GC selections again.
3702 if (!check_gc_consistency()) {
3703 return JNI_EINVAL;
3704 }
3705
3706 if (TieredCompilation) {
3707 set_tiered_flags();
3708 } else {
3709 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3710 if (CompilationPolicyChoice >= 2) {
3711 vm_exit_during_initialization(
3712 "Incompatible compilation policy selected", NULL);
3713 }
3714 }
3715 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3716 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3717 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3718 }
3719
3720
3721 // Set heap size based on available physical memory
3722 set_heap_size();
3723
3724 #if INCLUDE_ALL_GCS
3725 // Set per-collector flags
3726 if (UseParallelGC || UseParallelOldGC) {
3727 set_parallel_gc_flags();
3728 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
3729 set_cms_and_parnew_gc_flags();
3730 } else if (UseParNewGC) { // Skipped if CMS is set above
3731 set_parnew_gc_flags();
3732 } else if (UseG1GC) {
3733 set_g1_gc_flags();
3734 }
3735 check_deprecated_gcs();
3736 check_deprecated_gc_flags();
3737 if (AssumeMP && !UseSerialGC) {
3738 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3739 warning("If the number of processors is expected to increase from one, then"
3740 " you should configure the number of parallel GC threads appropriately"
3741 " using -XX:ParallelGCThreads=N");
3742 }
3743 }
3744 if (MinHeapFreeRatio == 100) {
3745 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
3746 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
3747 }
3748 #else // INCLUDE_ALL_GCS
3749 assert(verify_serial_gc_flags(), "SerialGC unset");
3750 #endif // INCLUDE_ALL_GCS
3751
3752 // Initialize Metaspace flags and alignments
3753 Metaspace::ergo_initialize();
3754
3755 // Set bytecode rewriting flags
3756 set_bytecode_flags();
3757
3758 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3759 set_aggressive_opts_flags();
3760
3761 // Turn off biased locking for locking debug mode flags,
3762 // which are subtly different from each other but neither works with
3763 // biased locking
3764 if (UseHeavyMonitors
3765 #ifdef COMPILER1
3766 || !UseFastLocking
3767 #endif // COMPILER1
3768 ) {
3769 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3770 // flag set to true on command line; warn the user that they
3771 // can't enable biased locking here
3772 warning("Biased Locking is not supported with locking debug flags"
3773 "; ignoring UseBiasedLocking flag." );
3774 }
3775 UseBiasedLocking = false;
3776 }
3777
3778 #ifdef ZERO
3779 // Clear flags not supported on zero.
3780 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3781 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3782 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3783 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3784 #endif // CC_INTERP
3785
3786 #ifdef COMPILER2
3787 if (!EliminateLocks) {
3788 EliminateNestedLocks = false;
3789 }
3790 if (!Inline) {
3791 IncrementalInline = false;
3792 }
3793 #ifndef PRODUCT
3794 if (!IncrementalInline) {
3795 AlwaysIncrementalInline = false;
3796 }
3797 #endif
3798 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3799 // nothing to use the profiling, turn if off
3800 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3801 }
3802 if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) {
3803 // Doing the replace in parent maps helps speculation
3804 FLAG_SET_DEFAULT(ReplaceInParentMaps, true);
3805 }
3806 #endif
3807
3808 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3809 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3810 DebugNonSafepoints = true;
3811 }
3812
3813 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3814 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3815 }
3816
3817 #ifndef PRODUCT
3818 if (CompileTheWorld) {
3819 // Force NmethodSweeper to sweep whole CodeCache each time.
3820 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3821 NmethodSweepFraction = 1;
3822 }
3823 }
3824
3825 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3826 if (use_vm_log()) {
3827 LogVMOutput = true;
3828 }
3829 }
3830 #endif // PRODUCT
3831
3832 if (PrintCommandLineFlags) {
3833 CommandLineFlags::printSetFlags(tty);
3834 }
3835
3836 // Apply CPU specific policy for the BiasedLocking
3837 if (UseBiasedLocking) {
3838 if (!VM_Version::use_biased_locking() &&
3839 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3840 UseBiasedLocking = false;
3841 }
3842 }
3843 #ifdef COMPILER2
3844 if (!UseBiasedLocking || EmitSync != 0) {
3845 UseOptoBiasInlining = false;
3846 }
3847 #endif
3848
3849 return JNI_OK;
3850 }
3851
3852 jint Arguments::adjust_after_os() {
3853 if (UseNUMA) {
3854 if (UseParallelGC || UseParallelOldGC) {
3855 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3856 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3857 }
3858 }
3859 // UseNUMAInterleaving is set to ON for all collectors and
3860 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3861 // such as the parallel collector for Linux and Solaris will
3862 // interleave old gen and survivor spaces on top of NUMA
3863 // allocation policy for the eden space.
3864 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3865 // all platforms and ParallelGC on Windows will interleave all
3866 // of the heap spaces across NUMA nodes.
3867 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3868 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3869 }
3870 }
3871 return JNI_OK;
3872 }
3873
3874 int Arguments::PropertyList_count(SystemProperty* pl) {
3875 int count = 0;
3876 while(pl != NULL) {
3877 count++;
3878 pl = pl->next();
3879 }
3880 return count;
3881 }
3882
3883 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3884 assert(key != NULL, "just checking");
3885 SystemProperty* prop;
3886 for (prop = pl; prop != NULL; prop = prop->next()) {
3887 if (strcmp(key, prop->key()) == 0) return prop->value();
3888 }
3889 return NULL;
3890 }
3891
3892 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3893 int count = 0;
3894 const char* ret_val = NULL;
3895
3896 while(pl != NULL) {
3897 if(count >= index) {
3898 ret_val = pl->key();
3899 break;
3900 }
3901 count++;
3902 pl = pl->next();
3903 }
3904
3905 return ret_val;
3906 }
3907
3908 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3909 int count = 0;
3910 char* ret_val = NULL;
3911
3912 while(pl != NULL) {
3913 if(count >= index) {
3914 ret_val = pl->value();
3915 break;
3916 }
3917 count++;
3918 pl = pl->next();
3919 }
3920
3921 return ret_val;
3922 }
3923
3924 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3925 SystemProperty* p = *plist;
3926 if (p == NULL) {
3927 *plist = new_p;
3928 } else {
3929 while (p->next() != NULL) {
3930 p = p->next();
3931 }
3932 p->set_next(new_p);
3933 }
3934 }
3935
3936 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3937 if (plist == NULL)
3938 return;
3939
3940 SystemProperty* new_p = new SystemProperty(k, v, true);
3941 PropertyList_add(plist, new_p);
3942 }
3943
3944 // This add maintains unique property key in the list.
3945 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3946 if (plist == NULL)
3947 return;
3948
3949 // If property key exist then update with new value.
3950 SystemProperty* prop;
3951 for (prop = *plist; prop != NULL; prop = prop->next()) {
3952 if (strcmp(k, prop->key()) == 0) {
3953 if (append) {
3954 prop->append_value(v);
3955 } else {
3956 prop->set_value(v);
3957 }
3958 return;
3959 }
3960 }
3961
3962 PropertyList_add(plist, k, v);
3963 }
3964
3965 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3966 // Returns true if all of the source pointed by src has been copied over to
3967 // the destination buffer pointed by buf. Otherwise, returns false.
3968 // Notes:
3969 // 1. If the length (buflen) of the destination buffer excluding the
3970 // NULL terminator character is not long enough for holding the expanded
3971 // pid characters, it also returns false instead of returning the partially
3972 // expanded one.
3973 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3974 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3975 char* buf, size_t buflen) {
3976 const char* p = src;
3977 char* b = buf;
3978 const char* src_end = &src[srclen];
3979 char* buf_end = &buf[buflen - 1];
3980
3981 while (p < src_end && b < buf_end) {
3982 if (*p == '%') {
3983 switch (*(++p)) {
3984 case '%': // "%%" ==> "%"
3985 *b++ = *p++;
3986 break;
3987 case 'p': { // "%p" ==> current process id
3988 // buf_end points to the character before the last character so
3989 // that we could write '\0' to the end of the buffer.
3990 size_t buf_sz = buf_end - b + 1;
3991 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3992
3993 // if jio_snprintf fails or the buffer is not long enough to hold
3994 // the expanded pid, returns false.
3995 if (ret < 0 || ret >= (int)buf_sz) {
3996 return false;
3997 } else {
3998 b += ret;
3999 assert(*b == '\0', "fail in copy_expand_pid");
4000 if (p == src_end && b == buf_end + 1) {
4001 // reach the end of the buffer.
4002 return true;
4003 }
4004 }
4005 p++;
4006 break;
4007 }
4008 default :
4009 *b++ = '%';
4010 }
4011 } else {
4012 *b++ = *p++;
4013 }
4014 }
4015 *b = '\0';
4016 return (p == src_end); // return false if not all of the source was copied
4017 }