1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "compiler/compilerOracle.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/cardTableRS.hpp"
31 #include "memory/genCollectedHeap.hpp"
32 #include "memory/referenceProcessor.hpp"
33 #include "memory/universe.inline.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "prims/jvmtiExport.hpp"
36 #include "runtime/arguments.hpp"
37 #include "runtime/globals_extension.hpp"
38 #include "runtime/java.hpp"
39 #include "services/management.hpp"
40 #include "services/memTracker.hpp"
41 #include "utilities/defaultStream.hpp"
42 #include "utilities/macros.hpp"
43 #include "utilities/taskqueue.hpp"
44 #ifdef TARGET_OS_FAMILY_linux
45 # include "os_linux.inline.hpp"
46 #endif
47 #ifdef TARGET_OS_FAMILY_solaris
48 # include "os_solaris.inline.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_windows
51 # include "os_windows.inline.hpp"
52 #endif
53 #ifdef TARGET_OS_FAMILY_aix
54 # include "os_aix.inline.hpp"
55 #endif
56 #ifdef TARGET_OS_FAMILY_bsd
57 # include "os_bsd.inline.hpp"
58 #endif
59 #if INCLUDE_ALL_GCS
60 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
61 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
62 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
63 #endif // INCLUDE_ALL_GCS
64
65 // Note: This is a special bug reporting site for the JVM
66 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
67 #define DEFAULT_JAVA_LAUNCHER "generic"
68
69 // Disable options not supported in this release, with a warning if they
70 // were explicitly requested on the command-line
71 #define UNSUPPORTED_OPTION(opt, description) \
72 do { \
73 if (opt) { \
74 if (FLAG_IS_CMDLINE(opt)) { \
75 warning(description " is disabled in this release."); \
76 } \
77 FLAG_SET_DEFAULT(opt, false); \
78 } \
79 } while(0)
80
81 #define UNSUPPORTED_GC_OPTION(gc) \
82 do { \
83 if (gc) { \
84 if (FLAG_IS_CMDLINE(gc)) { \
85 warning(#gc " is not supported in this VM. Using Serial GC."); \
86 } \
87 FLAG_SET_DEFAULT(gc, false); \
88 } \
89 } while(0)
90
91 char** Arguments::_jvm_flags_array = NULL;
92 int Arguments::_num_jvm_flags = 0;
93 char** Arguments::_jvm_args_array = NULL;
94 int Arguments::_num_jvm_args = 0;
95 char* Arguments::_java_command = NULL;
96 SystemProperty* Arguments::_system_properties = NULL;
97 const char* Arguments::_gc_log_filename = NULL;
98 bool Arguments::_has_profile = false;
99 size_t Arguments::_conservative_max_heap_alignment = 0;
100 uintx Arguments::_min_heap_size = 0;
101 Arguments::Mode Arguments::_mode = _mixed;
102 bool Arguments::_java_compiler = false;
103 bool Arguments::_xdebug_mode = false;
104 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
105 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
106 int Arguments::_sun_java_launcher_pid = -1;
107 bool Arguments::_sun_java_launcher_is_altjvm = false;
108
109 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
110 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
111 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
112 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
113 bool Arguments::_ClipInlining = ClipInlining;
114
115 char* Arguments::SharedArchivePath = NULL;
116
117 AgentLibraryList Arguments::_libraryList;
118 AgentLibraryList Arguments::_agentList;
119
120 abort_hook_t Arguments::_abort_hook = NULL;
121 exit_hook_t Arguments::_exit_hook = NULL;
122 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
123
124
125 SystemProperty *Arguments::_java_ext_dirs = NULL;
126 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
127 SystemProperty *Arguments::_sun_boot_library_path = NULL;
128 SystemProperty *Arguments::_java_library_path = NULL;
129 SystemProperty *Arguments::_java_home = NULL;
130 SystemProperty *Arguments::_java_class_path = NULL;
131 SystemProperty *Arguments::_sun_boot_class_path = NULL;
132
133 char* Arguments::_meta_index_path = NULL;
134 char* Arguments::_meta_index_dir = NULL;
135
136 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
137
138 static bool match_option(const JavaVMOption *option, const char* name,
139 const char** tail) {
140 int len = (int)strlen(name);
141 if (strncmp(option->optionString, name, len) == 0) {
142 *tail = option->optionString + len;
143 return true;
144 } else {
145 return false;
146 }
147 }
148
149 static void logOption(const char* opt) {
150 if (PrintVMOptions) {
151 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
152 }
153 }
154
155 // Process java launcher properties.
156 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
157 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
158 // sun.java.launcher.pid is defined.
159 // Must do this before setting up other system properties,
160 // as some of them may depend on launcher type.
161 for (int index = 0; index < args->nOptions; index++) {
162 const JavaVMOption* option = args->options + index;
163 const char* tail;
164
165 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
166 process_java_launcher_argument(tail, option->extraInfo);
167 continue;
168 }
169 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
170 if (strcmp(tail, "true") == 0) {
171 _sun_java_launcher_is_altjvm = true;
172 }
173 continue;
174 }
175 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
176 _sun_java_launcher_pid = atoi(tail);
177 continue;
178 }
179 }
180 }
181
182 // Initialize system properties key and value.
183 void Arguments::init_system_properties() {
184
185 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
186 "Java Virtual Machine Specification", false));
187 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
188 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
190
191 // Following are JVMTI agent writable properties.
192 // Properties values are set to NULL and they are
193 // os specific they are initialized in os::init_system_properties_values().
194 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
195 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
196 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
197 _java_library_path = new SystemProperty("java.library.path", NULL, true);
198 _java_home = new SystemProperty("java.home", NULL, true);
199 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
200
201 _java_class_path = new SystemProperty("java.class.path", "", true);
202
203 // Add to System Property list.
204 PropertyList_add(&_system_properties, _java_ext_dirs);
205 PropertyList_add(&_system_properties, _java_endorsed_dirs);
206 PropertyList_add(&_system_properties, _sun_boot_library_path);
207 PropertyList_add(&_system_properties, _java_library_path);
208 PropertyList_add(&_system_properties, _java_home);
209 PropertyList_add(&_system_properties, _java_class_path);
210 PropertyList_add(&_system_properties, _sun_boot_class_path);
211
212 // Set OS specific system properties values
213 os::init_system_properties_values();
214 }
215
216
217 // Update/Initialize System properties after JDK version number is known
218 void Arguments::init_version_specific_system_properties() {
219 enum { bufsz = 16 };
220 char buffer[bufsz];
221 const char* spec_vendor = "Sun Microsystems Inc.";
222 uint32_t spec_version = 0;
223
224 if (JDK_Version::is_gte_jdk17x_version()) {
225 spec_vendor = "Oracle Corporation";
226 spec_version = JDK_Version::current().major_version();
227 }
228 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
229
230 PropertyList_add(&_system_properties,
231 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.specification.version", buffer, false));
234 PropertyList_add(&_system_properties,
235 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
236 }
237
238 /**
239 * Provide a slightly more user-friendly way of eliminating -XX flags.
240 * When a flag is eliminated, it can be added to this list in order to
241 * continue accepting this flag on the command-line, while issuing a warning
242 * and ignoring the value. Once the JDK version reaches the 'accept_until'
243 * limit, we flatly refuse to admit the existence of the flag. This allows
244 * a flag to die correctly over JDK releases using HSX.
245 */
246 typedef struct {
247 const char* name;
248 JDK_Version obsoleted_in; // when the flag went away
249 JDK_Version accept_until; // which version to start denying the existence
250 } ObsoleteFlag;
251
252 static ObsoleteFlag obsolete_jvm_flags[] = {
253 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
258 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
259 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
260 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
261 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
262 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
263 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
264 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
265 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
266 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
267 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
268 { "DefaultInitialRAMFraction",
269 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
270 { "UseDepthFirstScavengeOrder",
271 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
272 { "HandlePromotionFailure",
273 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
274 { "MaxLiveObjectEvacuationRatio",
275 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
276 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
277 { "UseParallelOldGCCompacting",
278 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
279 { "UseParallelDensePrefixUpdate",
280 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
281 { "UseParallelOldGCDensePrefix",
282 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
283 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
284 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
285 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
295 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
296 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
297 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
298 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
299 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
300 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
302 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
303 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
304 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
305 #ifdef PRODUCT
306 { "DesiredMethodLimit",
307 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
308 #endif // PRODUCT
309 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) },
310 { NULL, JDK_Version(0), JDK_Version(0) }
311 };
312
313 // Returns true if the flag is obsolete and fits into the range specified
314 // for being ignored. In the case that the flag is ignored, the 'version'
315 // value is filled in with the version number when the flag became
316 // obsolete so that that value can be displayed to the user.
317 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
318 int i = 0;
319 assert(version != NULL, "Must provide a version buffer");
320 while (obsolete_jvm_flags[i].name != NULL) {
321 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
322 // <flag>=xxx form
323 // [-|+]<flag> form
324 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
325 ((s[0] == '+' || s[0] == '-') &&
326 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
327 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
328 *version = flag_status.obsoleted_in;
329 return true;
330 }
331 }
332 i++;
333 }
334 return false;
335 }
336
337 // Constructs the system class path (aka boot class path) from the following
338 // components, in order:
339 //
340 // prefix // from -Xbootclasspath/p:...
341 // endorsed // the expansion of -Djava.endorsed.dirs=...
342 // base // from os::get_system_properties() or -Xbootclasspath=
343 // suffix // from -Xbootclasspath/a:...
344 //
345 // java.endorsed.dirs is a list of directories; any jar or zip files in the
346 // directories are added to the sysclasspath just before the base.
347 //
348 // This could be AllStatic, but it isn't needed after argument processing is
349 // complete.
350 class SysClassPath: public StackObj {
351 public:
352 SysClassPath(const char* base);
353 ~SysClassPath();
354
355 inline void set_base(const char* base);
356 inline void add_prefix(const char* prefix);
357 inline void add_suffix_to_prefix(const char* suffix);
358 inline void add_suffix(const char* suffix);
359 inline void reset_path(const char* base);
360
361 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
362 // property. Must be called after all command-line arguments have been
363 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
364 // combined_path().
365 void expand_endorsed();
366
367 inline const char* get_base() const { return _items[_scp_base]; }
368 inline const char* get_prefix() const { return _items[_scp_prefix]; }
369 inline const char* get_suffix() const { return _items[_scp_suffix]; }
370 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
371
372 // Combine all the components into a single c-heap-allocated string; caller
373 // must free the string if/when no longer needed.
374 char* combined_path();
375
376 private:
377 // Utility routines.
378 static char* add_to_path(const char* path, const char* str, bool prepend);
379 static char* add_jars_to_path(char* path, const char* directory);
380
381 inline void reset_item_at(int index);
382
383 // Array indices for the items that make up the sysclasspath. All except the
384 // base are allocated in the C heap and freed by this class.
385 enum {
386 _scp_prefix, // from -Xbootclasspath/p:...
387 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
388 _scp_base, // the default sysclasspath
389 _scp_suffix, // from -Xbootclasspath/a:...
390 _scp_nitems // the number of items, must be last.
391 };
392
393 const char* _items[_scp_nitems];
394 DEBUG_ONLY(bool _expansion_done;)
395 };
396
397 SysClassPath::SysClassPath(const char* base) {
398 memset(_items, 0, sizeof(_items));
399 _items[_scp_base] = base;
400 DEBUG_ONLY(_expansion_done = false;)
401 }
402
403 SysClassPath::~SysClassPath() {
404 // Free everything except the base.
405 for (int i = 0; i < _scp_nitems; ++i) {
406 if (i != _scp_base) reset_item_at(i);
407 }
408 DEBUG_ONLY(_expansion_done = false;)
409 }
410
411 inline void SysClassPath::set_base(const char* base) {
412 _items[_scp_base] = base;
413 }
414
415 inline void SysClassPath::add_prefix(const char* prefix) {
416 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
417 }
418
419 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
420 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
421 }
422
423 inline void SysClassPath::add_suffix(const char* suffix) {
424 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
425 }
426
427 inline void SysClassPath::reset_item_at(int index) {
428 assert(index < _scp_nitems && index != _scp_base, "just checking");
429 if (_items[index] != NULL) {
430 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
431 _items[index] = NULL;
432 }
433 }
434
435 inline void SysClassPath::reset_path(const char* base) {
436 // Clear the prefix and suffix.
437 reset_item_at(_scp_prefix);
438 reset_item_at(_scp_suffix);
439 set_base(base);
440 }
441
442 //------------------------------------------------------------------------------
443
444 void SysClassPath::expand_endorsed() {
445 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
446
447 const char* path = Arguments::get_property("java.endorsed.dirs");
448 if (path == NULL) {
449 path = Arguments::get_endorsed_dir();
450 assert(path != NULL, "no default for java.endorsed.dirs");
451 }
452
453 char* expanded_path = NULL;
454 const char separator = *os::path_separator();
455 const char* const end = path + strlen(path);
456 while (path < end) {
457 const char* tmp_end = strchr(path, separator);
458 if (tmp_end == NULL) {
459 expanded_path = add_jars_to_path(expanded_path, path);
460 path = end;
461 } else {
462 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
463 memcpy(dirpath, path, tmp_end - path);
464 dirpath[tmp_end - path] = '\0';
465 expanded_path = add_jars_to_path(expanded_path, dirpath);
466 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
467 path = tmp_end + 1;
468 }
469 }
470 _items[_scp_endorsed] = expanded_path;
471 DEBUG_ONLY(_expansion_done = true;)
472 }
473
474 // Combine the bootclasspath elements, some of which may be null, into a single
475 // c-heap-allocated string.
476 char* SysClassPath::combined_path() {
477 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
478 assert(_expansion_done, "must call expand_endorsed() first.");
479
480 size_t lengths[_scp_nitems];
481 size_t total_len = 0;
482
483 const char separator = *os::path_separator();
484
485 // Get the lengths.
486 int i;
487 for (i = 0; i < _scp_nitems; ++i) {
488 if (_items[i] != NULL) {
489 lengths[i] = strlen(_items[i]);
490 // Include space for the separator char (or a NULL for the last item).
491 total_len += lengths[i] + 1;
492 }
493 }
494 assert(total_len > 0, "empty sysclasspath not allowed");
495
496 // Copy the _items to a single string.
497 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
498 char* cp_tmp = cp;
499 for (i = 0; i < _scp_nitems; ++i) {
500 if (_items[i] != NULL) {
501 memcpy(cp_tmp, _items[i], lengths[i]);
502 cp_tmp += lengths[i];
503 *cp_tmp++ = separator;
504 }
505 }
506 *--cp_tmp = '\0'; // Replace the extra separator.
507 return cp;
508 }
509
510 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
511 char*
512 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
513 char *cp;
514
515 assert(str != NULL, "just checking");
516 if (path == NULL) {
517 size_t len = strlen(str) + 1;
518 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
519 memcpy(cp, str, len); // copy the trailing null
520 } else {
521 const char separator = *os::path_separator();
522 size_t old_len = strlen(path);
523 size_t str_len = strlen(str);
524 size_t len = old_len + str_len + 2;
525
526 if (prepend) {
527 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
528 char* cp_tmp = cp;
529 memcpy(cp_tmp, str, str_len);
530 cp_tmp += str_len;
531 *cp_tmp = separator;
532 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
533 FREE_C_HEAP_ARRAY(char, path, mtInternal);
534 } else {
535 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
536 char* cp_tmp = cp + old_len;
537 *cp_tmp = separator;
538 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
539 }
540 }
541 return cp;
542 }
543
544 // Scan the directory and append any jar or zip files found to path.
545 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
546 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
547 DIR* dir = os::opendir(directory);
548 if (dir == NULL) return path;
549
550 char dir_sep[2] = { '\0', '\0' };
551 size_t directory_len = strlen(directory);
552 const char fileSep = *os::file_separator();
553 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
554
555 /* Scan the directory for jars/zips, appending them to path. */
556 struct dirent *entry;
557 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
558 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
559 const char* name = entry->d_name;
560 const char* ext = name + strlen(name) - 4;
561 bool isJarOrZip = ext > name &&
562 (os::file_name_strcmp(ext, ".jar") == 0 ||
563 os::file_name_strcmp(ext, ".zip") == 0);
564 if (isJarOrZip) {
565 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
566 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
567 path = add_to_path(path, jarpath, false);
568 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
569 }
570 }
571 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
572 os::closedir(dir);
573 return path;
574 }
575
576 // Parses a memory size specification string.
577 static bool atomull(const char *s, julong* result) {
578 julong n = 0;
579 int args_read = sscanf(s, JULONG_FORMAT, &n);
580 if (args_read != 1) {
581 return false;
582 }
583 while (*s != '\0' && isdigit(*s)) {
584 s++;
585 }
586 // 4705540: illegal if more characters are found after the first non-digit
587 if (strlen(s) > 1) {
588 return false;
589 }
590 switch (*s) {
591 case 'T': case 't':
592 *result = n * G * K;
593 // Check for overflow.
594 if (*result/((julong)G * K) != n) return false;
595 return true;
596 case 'G': case 'g':
597 *result = n * G;
598 if (*result/G != n) return false;
599 return true;
600 case 'M': case 'm':
601 *result = n * M;
602 if (*result/M != n) return false;
603 return true;
604 case 'K': case 'k':
605 *result = n * K;
606 if (*result/K != n) return false;
607 return true;
608 case '\0':
609 *result = n;
610 return true;
611 default:
612 return false;
613 }
614 }
615
616 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
617 if (size < min_size) return arg_too_small;
618 // Check that size will fit in a size_t (only relevant on 32-bit)
619 if (size > max_uintx) return arg_too_big;
620 return arg_in_range;
621 }
622
623 // Describe an argument out of range error
624 void Arguments::describe_range_error(ArgsRange errcode) {
625 switch(errcode) {
626 case arg_too_big:
627 jio_fprintf(defaultStream::error_stream(),
628 "The specified size exceeds the maximum "
629 "representable size.\n");
630 break;
631 case arg_too_small:
632 case arg_unreadable:
633 case arg_in_range:
634 // do nothing for now
635 break;
636 default:
637 ShouldNotReachHere();
638 }
639 }
640
641 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
642 return CommandLineFlags::boolAtPut(name, &value, origin);
643 }
644
645 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
646 double v;
647 if (sscanf(value, "%lf", &v) != 1) {
648 return false;
649 }
650
651 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
652 return true;
653 }
654 return false;
655 }
656
657 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
658 julong v;
659 intx intx_v;
660 bool is_neg = false;
661 // Check the sign first since atomull() parses only unsigned values.
662 if (*value == '-') {
663 if (!CommandLineFlags::intxAt(name, &intx_v)) {
664 return false;
665 }
666 value++;
667 is_neg = true;
668 }
669 if (!atomull(value, &v)) {
670 return false;
671 }
672 intx_v = (intx) v;
673 if (is_neg) {
674 intx_v = -intx_v;
675 }
676 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
677 return true;
678 }
679 uintx uintx_v = (uintx) v;
680 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
681 return true;
682 }
683 uint64_t uint64_t_v = (uint64_t) v;
684 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
685 return true;
686 }
687 return false;
688 }
689
690 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
691 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
692 // Contract: CommandLineFlags always returns a pointer that needs freeing.
693 FREE_C_HEAP_ARRAY(char, value, mtInternal);
694 return true;
695 }
696
697 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
698 const char* old_value = "";
699 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
700 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
701 size_t new_len = strlen(new_value);
702 const char* value;
703 char* free_this_too = NULL;
704 if (old_len == 0) {
705 value = new_value;
706 } else if (new_len == 0) {
707 value = old_value;
708 } else {
709 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
710 // each new setting adds another LINE to the switch:
711 sprintf(buf, "%s\n%s", old_value, new_value);
712 value = buf;
713 free_this_too = buf;
714 }
715 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
716 // CommandLineFlags always returns a pointer that needs freeing.
717 FREE_C_HEAP_ARRAY(char, value, mtInternal);
718 if (free_this_too != NULL) {
719 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
720 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
721 }
722 return true;
723 }
724
725 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
726
727 // range of acceptable characters spelled out for portability reasons
728 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
729 #define BUFLEN 255
730 char name[BUFLEN+1];
731 char dummy;
732
733 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
734 return set_bool_flag(name, false, origin);
735 }
736 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
737 return set_bool_flag(name, true, origin);
738 }
739
740 char punct;
741 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
742 const char* value = strchr(arg, '=') + 1;
743 Flag* flag = Flag::find_flag(name, strlen(name));
744 if (flag != NULL && flag->is_ccstr()) {
745 if (flag->ccstr_accumulates()) {
746 return append_to_string_flag(name, value, origin);
747 } else {
748 if (value[0] == '\0') {
749 value = NULL;
750 }
751 return set_string_flag(name, value, origin);
752 }
753 }
754 }
755
756 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
757 const char* value = strchr(arg, '=') + 1;
758 // -XX:Foo:=xxx will reset the string flag to the given value.
759 if (value[0] == '\0') {
760 value = NULL;
761 }
762 return set_string_flag(name, value, origin);
763 }
764
765 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
766 #define SIGNED_NUMBER_RANGE "[-0123456789]"
767 #define NUMBER_RANGE "[0123456789]"
768 char value[BUFLEN + 1];
769 char value2[BUFLEN + 1];
770 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
771 // Looks like a floating-point number -- try again with more lenient format string
772 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
773 return set_fp_numeric_flag(name, value, origin);
774 }
775 }
776
777 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
778 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
779 return set_numeric_flag(name, value, origin);
780 }
781
782 return false;
783 }
784
785 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
786 assert(bldarray != NULL, "illegal argument");
787
788 if (arg == NULL) {
789 return;
790 }
791
792 int new_count = *count + 1;
793
794 // expand the array and add arg to the last element
795 if (*bldarray == NULL) {
796 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
797 } else {
798 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
799 }
800 (*bldarray)[*count] = strdup(arg);
801 *count = new_count;
802 }
803
804 void Arguments::build_jvm_args(const char* arg) {
805 add_string(&_jvm_args_array, &_num_jvm_args, arg);
806 }
807
808 void Arguments::build_jvm_flags(const char* arg) {
809 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
810 }
811
812 // utility function to return a string that concatenates all
813 // strings in a given char** array
814 const char* Arguments::build_resource_string(char** args, int count) {
815 if (args == NULL || count == 0) {
816 return NULL;
817 }
818 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
819 for (int i = 1; i < count; i++) {
820 length += strlen(args[i]) + 1; // add 1 for a space
821 }
822 char* s = NEW_RESOURCE_ARRAY(char, length);
823 strcpy(s, args[0]);
824 for (int j = 1; j < count; j++) {
825 strcat(s, " ");
826 strcat(s, args[j]);
827 }
828 return (const char*) s;
829 }
830
831 void Arguments::print_on(outputStream* st) {
832 st->print_cr("VM Arguments:");
833 if (num_jvm_flags() > 0) {
834 st->print("jvm_flags: "); print_jvm_flags_on(st);
835 }
836 if (num_jvm_args() > 0) {
837 st->print("jvm_args: "); print_jvm_args_on(st);
838 }
839 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
840 if (_java_class_path != NULL) {
841 char* path = _java_class_path->value();
842 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
843 }
844 st->print_cr("Launcher Type: %s", _sun_java_launcher);
845 }
846
847 void Arguments::print_jvm_flags_on(outputStream* st) {
848 if (_num_jvm_flags > 0) {
849 for (int i=0; i < _num_jvm_flags; i++) {
850 st->print("%s ", _jvm_flags_array[i]);
851 }
852 st->print_cr("");
853 }
854 }
855
856 void Arguments::print_jvm_args_on(outputStream* st) {
857 if (_num_jvm_args > 0) {
858 for (int i=0; i < _num_jvm_args; i++) {
859 st->print("%s ", _jvm_args_array[i]);
860 }
861 st->print_cr("");
862 }
863 }
864
865 bool Arguments::process_argument(const char* arg,
866 jboolean ignore_unrecognized, Flag::Flags origin) {
867
868 JDK_Version since = JDK_Version();
869
870 if (parse_argument(arg, origin) || ignore_unrecognized) {
871 return true;
872 }
873
874 bool has_plus_minus = (*arg == '+' || *arg == '-');
875 const char* const argname = has_plus_minus ? arg + 1 : arg;
876 if (is_newly_obsolete(arg, &since)) {
877 char version[256];
878 since.to_string(version, sizeof(version));
879 warning("ignoring option %s; support was removed in %s", argname, version);
880 return true;
881 }
882
883 // For locked flags, report a custom error message if available.
884 // Otherwise, report the standard unrecognized VM option.
885
886 size_t arg_len;
887 const char* equal_sign = strchr(argname, '=');
888 if (equal_sign == NULL) {
889 arg_len = strlen(argname);
890 } else {
891 arg_len = equal_sign - argname;
892 }
893
894 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
895 if (found_flag != NULL) {
896 char locked_message_buf[BUFLEN];
897 found_flag->get_locked_message(locked_message_buf, BUFLEN);
898 if (strlen(locked_message_buf) == 0) {
899 if (found_flag->is_bool() && !has_plus_minus) {
900 jio_fprintf(defaultStream::error_stream(),
901 "Missing +/- setting for VM option '%s'\n", argname);
902 } else if (!found_flag->is_bool() && has_plus_minus) {
903 jio_fprintf(defaultStream::error_stream(),
904 "Unexpected +/- setting in VM option '%s'\n", argname);
905 } else {
906 jio_fprintf(defaultStream::error_stream(),
907 "Improperly specified VM option '%s'\n", argname);
908 }
909 } else {
910 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
911 }
912 } else {
913 jio_fprintf(defaultStream::error_stream(),
914 "Unrecognized VM option '%s'\n", argname);
915 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
916 if (fuzzy_matched != NULL) {
917 jio_fprintf(defaultStream::error_stream(),
918 "Did you mean '%s%s%s'?\n",
919 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
920 fuzzy_matched->_name,
921 (fuzzy_matched->is_bool()) ? "" : "=<value>");
922 }
923 }
924
925 // allow for commandline "commenting out" options like -XX:#+Verbose
926 return arg[0] == '#';
927 }
928
929 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
930 FILE* stream = fopen(file_name, "rb");
931 if (stream == NULL) {
932 if (should_exist) {
933 jio_fprintf(defaultStream::error_stream(),
934 "Could not open settings file %s\n", file_name);
935 return false;
936 } else {
937 return true;
938 }
939 }
940
941 char token[1024];
942 int pos = 0;
943
944 bool in_white_space = true;
945 bool in_comment = false;
946 bool in_quote = false;
947 char quote_c = 0;
948 bool result = true;
949
950 int c = getc(stream);
951 while(c != EOF && pos < (int)(sizeof(token)-1)) {
952 if (in_white_space) {
953 if (in_comment) {
954 if (c == '\n') in_comment = false;
955 } else {
956 if (c == '#') in_comment = true;
957 else if (!isspace(c)) {
958 in_white_space = false;
959 token[pos++] = c;
960 }
961 }
962 } else {
963 if (c == '\n' || (!in_quote && isspace(c))) {
964 // token ends at newline, or at unquoted whitespace
965 // this allows a way to include spaces in string-valued options
966 token[pos] = '\0';
967 logOption(token);
968 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
969 build_jvm_flags(token);
970 pos = 0;
971 in_white_space = true;
972 in_quote = false;
973 } else if (!in_quote && (c == '\'' || c == '"')) {
974 in_quote = true;
975 quote_c = c;
976 } else if (in_quote && (c == quote_c)) {
977 in_quote = false;
978 } else {
979 token[pos++] = c;
980 }
981 }
982 c = getc(stream);
983 }
984 if (pos > 0) {
985 token[pos] = '\0';
986 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
987 build_jvm_flags(token);
988 }
989 fclose(stream);
990 return result;
991 }
992
993 //=============================================================================================================
994 // Parsing of properties (-D)
995
996 const char* Arguments::get_property(const char* key) {
997 return PropertyList_get_value(system_properties(), key);
998 }
999
1000 bool Arguments::add_property(const char* prop) {
1001 const char* eq = strchr(prop, '=');
1002 char* key;
1003 // ns must be static--its address may be stored in a SystemProperty object.
1004 const static char ns[1] = {0};
1005 char* value = (char *)ns;
1006
1007 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1008 key = AllocateHeap(key_len + 1, mtInternal);
1009 strncpy(key, prop, key_len);
1010 key[key_len] = '\0';
1011
1012 if (eq != NULL) {
1013 size_t value_len = strlen(prop) - key_len - 1;
1014 value = AllocateHeap(value_len + 1, mtInternal);
1015 strncpy(value, &prop[key_len + 1], value_len + 1);
1016 }
1017
1018 if (strcmp(key, "java.compiler") == 0) {
1019 process_java_compiler_argument(value);
1020 FreeHeap(key);
1021 if (eq != NULL) {
1022 FreeHeap(value);
1023 }
1024 return true;
1025 } else if (strcmp(key, "sun.java.command") == 0) {
1026 _java_command = value;
1027
1028 // Record value in Arguments, but let it get passed to Java.
1029 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1030 strcmp(key, "sun.java.launcher.pid") == 0) {
1031 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1032 // private and are processed in process_sun_java_launcher_properties();
1033 // the sun.java.launcher property is passed on to the java application
1034 FreeHeap(key);
1035 if (eq != NULL) {
1036 FreeHeap(value);
1037 }
1038 return true;
1039 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1040 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1041 // its value without going through the property list or making a Java call.
1042 _java_vendor_url_bug = value;
1043 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1044 PropertyList_unique_add(&_system_properties, key, value, true);
1045 return true;
1046 }
1047 // Create new property and add at the end of the list
1048 PropertyList_unique_add(&_system_properties, key, value);
1049 return true;
1050 }
1051
1052 //===========================================================================================================
1053 // Setting int/mixed/comp mode flags
1054
1055 void Arguments::set_mode_flags(Mode mode) {
1056 // Set up default values for all flags.
1057 // If you add a flag to any of the branches below,
1058 // add a default value for it here.
1059 set_java_compiler(false);
1060 _mode = mode;
1061
1062 // Ensure Agent_OnLoad has the correct initial values.
1063 // This may not be the final mode; mode may change later in onload phase.
1064 PropertyList_unique_add(&_system_properties, "java.vm.info",
1065 (char*)VM_Version::vm_info_string(), false);
1066
1067 UseInterpreter = true;
1068 UseCompiler = true;
1069 UseLoopCounter = true;
1070
1071 #ifndef ZERO
1072 // Turn these off for mixed and comp. Leave them on for Zero.
1073 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1074 UseFastAccessorMethods = (mode == _int);
1075 }
1076 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1077 UseFastEmptyMethods = (mode == _int);
1078 }
1079 #endif
1080
1081 // Default values may be platform/compiler dependent -
1082 // use the saved values
1083 ClipInlining = Arguments::_ClipInlining;
1084 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1085 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1086 BackgroundCompilation = Arguments::_BackgroundCompilation;
1087
1088 // Change from defaults based on mode
1089 switch (mode) {
1090 default:
1091 ShouldNotReachHere();
1092 break;
1093 case _int:
1094 UseCompiler = false;
1095 UseLoopCounter = false;
1096 AlwaysCompileLoopMethods = false;
1097 UseOnStackReplacement = false;
1098 break;
1099 case _mixed:
1100 // same as default
1101 break;
1102 case _comp:
1103 UseInterpreter = false;
1104 BackgroundCompilation = false;
1105 ClipInlining = false;
1106 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1107 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1108 // compile a level 4 (C2) and then continue executing it.
1109 if (TieredCompilation) {
1110 Tier3InvokeNotifyFreqLog = 0;
1111 Tier4InvocationThreshold = 0;
1112 }
1113 break;
1114 }
1115 }
1116
1117 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1118 // Conflict: required to use shared spaces (-Xshare:on), but
1119 // incompatible command line options were chosen.
1120
1121 static void no_shared_spaces() {
1122 if (RequireSharedSpaces) {
1123 jio_fprintf(defaultStream::error_stream(),
1124 "Class data sharing is inconsistent with other specified options.\n");
1125 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1126 } else {
1127 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1128 }
1129 }
1130 #endif
1131
1132 void Arguments::set_tiered_flags() {
1133 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1134 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1135 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1136 }
1137 if (CompilationPolicyChoice < 2) {
1138 vm_exit_during_initialization(
1139 "Incompatible compilation policy selected", NULL);
1140 }
1141 // Increase the code cache size - tiered compiles a lot more.
1142 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1143 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1144 }
1145 if (!UseInterpreter) { // -Xcomp
1146 Tier3InvokeNotifyFreqLog = 0;
1147 Tier4InvocationThreshold = 0;
1148 }
1149 }
1150
1151 #if INCLUDE_ALL_GCS
1152 static void disable_adaptive_size_policy(const char* collector_name) {
1153 if (UseAdaptiveSizePolicy) {
1154 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1155 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1156 collector_name);
1157 }
1158 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1159 }
1160 }
1161
1162 void Arguments::set_parnew_gc_flags() {
1163 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1164 "control point invariant");
1165 assert(UseParNewGC, "Error");
1166
1167 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1168 disable_adaptive_size_policy("UseParNewGC");
1169
1170 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1171 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1172 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1173 } else if (ParallelGCThreads == 0) {
1174 jio_fprintf(defaultStream::error_stream(),
1175 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1176 vm_exit(1);
1177 }
1178
1179 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1180 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1181 // we set them to 1024 and 1024.
1182 // See CR 6362902.
1183 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1184 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1185 }
1186 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1187 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1188 }
1189
1190 // When using compressed oops, we use local overflow stacks,
1191 // rather than using a global overflow list chained through
1192 // the klass word of the object's pre-image.
1193 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1194 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1195 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1196 }
1197 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1198 }
1199 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1200 }
1201
1202 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1203 // sparc/solaris for certain applications, but would gain from
1204 // further optimization and tuning efforts, and would almost
1205 // certainly gain from analysis of platform and environment.
1206 void Arguments::set_cms_and_parnew_gc_flags() {
1207 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1208 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1209
1210 // If we are using CMS, we prefer to UseParNewGC,
1211 // unless explicitly forbidden.
1212 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1213 FLAG_SET_ERGO(bool, UseParNewGC, true);
1214 }
1215
1216 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1217 disable_adaptive_size_policy("UseConcMarkSweepGC");
1218
1219 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1220 // as needed.
1221 if (UseParNewGC) {
1222 set_parnew_gc_flags();
1223 }
1224
1225 size_t max_heap = align_size_down(MaxHeapSize,
1226 CardTableRS::ct_max_alignment_constraint());
1227
1228 // Now make adjustments for CMS
1229 intx tenuring_default = (intx)6;
1230 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1231
1232 // Preferred young gen size for "short" pauses:
1233 // upper bound depends on # of threads and NewRatio.
1234 const uintx parallel_gc_threads =
1235 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1236 const size_t preferred_max_new_size_unaligned =
1237 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1238 size_t preferred_max_new_size =
1239 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1240
1241 // Unless explicitly requested otherwise, size young gen
1242 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1243
1244 // If either MaxNewSize or NewRatio is set on the command line,
1245 // assume the user is trying to set the size of the young gen.
1246 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1247
1248 // Set MaxNewSize to our calculated preferred_max_new_size unless
1249 // NewSize was set on the command line and it is larger than
1250 // preferred_max_new_size.
1251 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1252 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1253 } else {
1254 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1255 }
1256 if (PrintGCDetails && Verbose) {
1257 // Too early to use gclog_or_tty
1258 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1259 }
1260
1261 // Code along this path potentially sets NewSize and OldSize
1262 if (PrintGCDetails && Verbose) {
1263 // Too early to use gclog_or_tty
1264 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1265 " initial_heap_size: " SIZE_FORMAT
1266 " max_heap: " SIZE_FORMAT,
1267 min_heap_size(), InitialHeapSize, max_heap);
1268 }
1269 size_t min_new = preferred_max_new_size;
1270 if (FLAG_IS_CMDLINE(NewSize)) {
1271 min_new = NewSize;
1272 }
1273 if (max_heap > min_new && min_heap_size() > min_new) {
1274 // Unless explicitly requested otherwise, make young gen
1275 // at least min_new, and at most preferred_max_new_size.
1276 if (FLAG_IS_DEFAULT(NewSize)) {
1277 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1278 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1279 if (PrintGCDetails && Verbose) {
1280 // Too early to use gclog_or_tty
1281 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1282 }
1283 }
1284 // Unless explicitly requested otherwise, size old gen
1285 // so it's NewRatio x of NewSize.
1286 if (FLAG_IS_DEFAULT(OldSize)) {
1287 if (max_heap > NewSize) {
1288 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1289 if (PrintGCDetails && Verbose) {
1290 // Too early to use gclog_or_tty
1291 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1292 }
1293 }
1294 }
1295 }
1296 }
1297 // Unless explicitly requested otherwise, definitely
1298 // promote all objects surviving "tenuring_default" scavenges.
1299 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1300 FLAG_IS_DEFAULT(SurvivorRatio)) {
1301 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1302 }
1303 // If we decided above (or user explicitly requested)
1304 // `promote all' (via MaxTenuringThreshold := 0),
1305 // prefer minuscule survivor spaces so as not to waste
1306 // space for (non-existent) survivors
1307 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1308 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1309 }
1310 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1311 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1312 // This is done in order to make ParNew+CMS configuration to work
1313 // with YoungPLABSize and OldPLABSize options.
1314 // See CR 6362902.
1315 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1316 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1317 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1318 // is. In this situation let CMSParPromoteBlocksToClaim follow
1319 // the value (either from the command line or ergonomics) of
1320 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1321 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1322 } else {
1323 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1324 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1325 // we'll let it to take precedence.
1326 jio_fprintf(defaultStream::error_stream(),
1327 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1328 " options are specified for the CMS collector."
1329 " CMSParPromoteBlocksToClaim will take precedence.\n");
1330 }
1331 }
1332 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1333 // OldPLAB sizing manually turned off: Use a larger default setting,
1334 // unless it was manually specified. This is because a too-low value
1335 // will slow down scavenges.
1336 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1337 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1338 }
1339 }
1340 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1341 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1342 // If either of the static initialization defaults have changed, note this
1343 // modification.
1344 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1345 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1346 }
1347 if (PrintGCDetails && Verbose) {
1348 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1349 MarkStackSize / K, MarkStackSizeMax / K);
1350 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1351 }
1352 }
1353 #endif // INCLUDE_ALL_GCS
1354
1355 void set_object_alignment() {
1356 // Object alignment.
1357 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1358 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1359 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1360 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1361 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1362 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1363
1364 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1365 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1366
1367 // Oop encoding heap max
1368 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1369
1370 #if INCLUDE_ALL_GCS
1371 // Set CMS global values
1372 CompactibleFreeListSpace::set_cms_values();
1373 #endif // INCLUDE_ALL_GCS
1374 }
1375
1376 bool verify_object_alignment() {
1377 // Object alignment.
1378 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1379 jio_fprintf(defaultStream::error_stream(),
1380 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1381 (int)ObjectAlignmentInBytes);
1382 return false;
1383 }
1384 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1385 jio_fprintf(defaultStream::error_stream(),
1386 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1387 (int)ObjectAlignmentInBytes, BytesPerLong);
1388 return false;
1389 }
1390 // It does not make sense to have big object alignment
1391 // since a space lost due to alignment will be greater
1392 // then a saved space from compressed oops.
1393 if ((int)ObjectAlignmentInBytes > 256) {
1394 jio_fprintf(defaultStream::error_stream(),
1395 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1396 (int)ObjectAlignmentInBytes);
1397 return false;
1398 }
1399 // In case page size is very small.
1400 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1401 jio_fprintf(defaultStream::error_stream(),
1402 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1403 (int)ObjectAlignmentInBytes, os::vm_page_size());
1404 return false;
1405 }
1406 return true;
1407 }
1408
1409 uintx Arguments::max_heap_for_compressed_oops() {
1410 // Avoid sign flip.
1411 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1412 // We need to fit both the NULL page and the heap into the memory budget, while
1413 // keeping alignment constraints of the heap. To guarantee the latter, as the
1414 // NULL page is located before the heap, we pad the NULL page to the conservative
1415 // maximum alignment that the GC may ever impose upon the heap.
1416 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1417 _conservative_max_heap_alignment);
1418
1419 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1420 NOT_LP64(ShouldNotReachHere(); return 0);
1421 }
1422
1423 bool Arguments::should_auto_select_low_pause_collector() {
1424 if (UseAutoGCSelectPolicy &&
1425 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1426 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1427 if (PrintGCDetails) {
1428 // Cannot use gclog_or_tty yet.
1429 tty->print_cr("Automatic selection of the low pause collector"
1430 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1431 }
1432 return true;
1433 }
1434 return false;
1435 }
1436
1437 void Arguments::set_use_compressed_oops() {
1438 #ifndef ZERO
1439 #ifdef _LP64
1440 // MaxHeapSize is not set up properly at this point, but
1441 // the only value that can override MaxHeapSize if we are
1442 // to use UseCompressedOops is InitialHeapSize.
1443 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1444
1445 if (max_heap_size <= max_heap_for_compressed_oops()) {
1446 #if !defined(COMPILER1) || defined(TIERED)
1447 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1448 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1449 }
1450 #endif
1451 #ifdef _WIN64
1452 if (UseLargePages && UseCompressedOops) {
1453 // Cannot allocate guard pages for implicit checks in indexed addressing
1454 // mode, when large pages are specified on windows.
1455 // This flag could be switched ON if narrow oop base address is set to 0,
1456 // see code in Universe::initialize_heap().
1457 Universe::set_narrow_oop_use_implicit_null_checks(false);
1458 }
1459 #endif // _WIN64
1460 } else {
1461 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1462 warning("Max heap size too large for Compressed Oops");
1463 FLAG_SET_DEFAULT(UseCompressedOops, false);
1464 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1465 }
1466 }
1467 #endif // _LP64
1468 #endif // ZERO
1469 }
1470
1471
1472 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1473 // set_use_compressed_oops().
1474 void Arguments::set_use_compressed_klass_ptrs() {
1475 #ifndef ZERO
1476 #ifdef _LP64
1477 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1478 if (!UseCompressedOops) {
1479 if (UseCompressedClassPointers) {
1480 warning("UseCompressedClassPointers requires UseCompressedOops");
1481 }
1482 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1483 } else {
1484 // Turn on UseCompressedClassPointers too
1485 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1486 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1487 }
1488 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1489 if (UseCompressedClassPointers) {
1490 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1491 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1492 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1493 }
1494 }
1495 }
1496 #endif // _LP64
1497 #endif // !ZERO
1498 }
1499
1500 void Arguments::set_conservative_max_heap_alignment() {
1501 // The conservative maximum required alignment for the heap is the maximum of
1502 // the alignments imposed by several sources: any requirements from the heap
1503 // itself, the collector policy and the maximum page size we may run the VM
1504 // with.
1505 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1506 #if INCLUDE_ALL_GCS
1507 if (UseParallelGC) {
1508 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1509 } else if (UseG1GC) {
1510 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1511 }
1512 #endif // INCLUDE_ALL_GCS
1513 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(),
1514 CollectorPolicy::compute_heap_alignment());
1515 }
1516
1517 void Arguments::set_ergonomics_flags() {
1518
1519 if (os::is_server_class_machine()) {
1520 // If no other collector is requested explicitly,
1521 // let the VM select the collector based on
1522 // machine class and automatic selection policy.
1523 if (!UseSerialGC &&
1524 !UseConcMarkSweepGC &&
1525 !UseG1GC &&
1526 !UseParNewGC &&
1527 FLAG_IS_DEFAULT(UseParallelGC)) {
1528 if (should_auto_select_low_pause_collector()) {
1529 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1530 } else {
1531 FLAG_SET_ERGO(bool, UseParallelGC, true);
1532 }
1533 }
1534 }
1535 #ifdef COMPILER2
1536 // Shared spaces work fine with other GCs but causes bytecode rewriting
1537 // to be disabled, which hurts interpreter performance and decreases
1538 // server performance. When -server is specified, keep the default off
1539 // unless it is asked for. Future work: either add bytecode rewriting
1540 // at link time, or rewrite bytecodes in non-shared methods.
1541 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1542 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1543 no_shared_spaces();
1544 }
1545 #endif
1546
1547 set_conservative_max_heap_alignment();
1548
1549 #ifndef ZERO
1550 #ifdef _LP64
1551 set_use_compressed_oops();
1552
1553 // set_use_compressed_klass_ptrs() must be called after calling
1554 // set_use_compressed_oops().
1555 set_use_compressed_klass_ptrs();
1556
1557 // Also checks that certain machines are slower with compressed oops
1558 // in vm_version initialization code.
1559 #endif // _LP64
1560 #endif // !ZERO
1561 }
1562
1563 void Arguments::set_parallel_gc_flags() {
1564 assert(UseParallelGC || UseParallelOldGC, "Error");
1565 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1566 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1567 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1568 }
1569 FLAG_SET_DEFAULT(UseParallelGC, true);
1570
1571 // If no heap maximum was requested explicitly, use some reasonable fraction
1572 // of the physical memory, up to a maximum of 1GB.
1573 FLAG_SET_DEFAULT(ParallelGCThreads,
1574 Abstract_VM_Version::parallel_worker_threads());
1575 if (ParallelGCThreads == 0) {
1576 jio_fprintf(defaultStream::error_stream(),
1577 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1578 vm_exit(1);
1579 }
1580
1581 if (UseAdaptiveSizePolicy) {
1582 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1583 // unless the user actually sets these flags.
1584 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1585 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1586 }
1587 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1588 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1589 }
1590 }
1591
1592 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1593 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1594 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1595 // See CR 6362902 for details.
1596 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1597 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1598 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1599 }
1600 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1601 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1602 }
1603 }
1604
1605 if (UseParallelOldGC) {
1606 // Par compact uses lower default values since they are treated as
1607 // minimums. These are different defaults because of the different
1608 // interpretation and are not ergonomically set.
1609 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1610 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1611 }
1612 }
1613 }
1614
1615 void Arguments::set_g1_gc_flags() {
1616 assert(UseG1GC, "Error");
1617 #ifdef COMPILER1
1618 FastTLABRefill = false;
1619 #endif
1620 FLAG_SET_DEFAULT(ParallelGCThreads,
1621 Abstract_VM_Version::parallel_worker_threads());
1622 if (ParallelGCThreads == 0) {
1623 FLAG_SET_DEFAULT(ParallelGCThreads,
1624 Abstract_VM_Version::parallel_worker_threads());
1625 }
1626
1627 // MarkStackSize will be set (if it hasn't been set by the user)
1628 // when concurrent marking is initialized.
1629 // Its value will be based upon the number of parallel marking threads.
1630 // But we do set the maximum mark stack size here.
1631 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1632 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1633 }
1634
1635 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1636 // In G1, we want the default GC overhead goal to be higher than
1637 // say in PS. So we set it here to 10%. Otherwise the heap might
1638 // be expanded more aggressively than we would like it to. In
1639 // fact, even 10% seems to not be high enough in some cases
1640 // (especially small GC stress tests that the main thing they do
1641 // is allocation). We might consider increase it further.
1642 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1643 }
1644
1645 if (PrintGCDetails && Verbose) {
1646 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1647 MarkStackSize / K, MarkStackSizeMax / K);
1648 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1649 }
1650 }
1651
1652 julong Arguments::limit_by_allocatable_memory(julong limit) {
1653 julong max_allocatable;
1654 julong result = limit;
1655 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1656 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1657 }
1658 return result;
1659 }
1660
1661 // Use static initialization to get the default before parsing
1662 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1663
1664 void Arguments::set_heap_size() {
1665 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1666 // Deprecated flag
1667 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1668 }
1669
1670 const julong phys_mem =
1671 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1672 : (julong)MaxRAM;
1673
1674 // If the maximum heap size has not been set with -Xmx,
1675 // then set it as fraction of the size of physical memory,
1676 // respecting the maximum and minimum sizes of the heap.
1677 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1678 julong reasonable_max = phys_mem / MaxRAMFraction;
1679
1680 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1681 // Small physical memory, so use a minimum fraction of it for the heap
1682 reasonable_max = phys_mem / MinRAMFraction;
1683 } else {
1684 // Not-small physical memory, so require a heap at least
1685 // as large as MaxHeapSize
1686 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1687 }
1688 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1689 // Limit the heap size to ErgoHeapSizeLimit
1690 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1691 }
1692 if (UseCompressedOops) {
1693 // Limit the heap size to the maximum possible when using compressed oops
1694 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1695
1696 // HeapBaseMinAddress can be greater than default but not less than.
1697 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1698 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1699 // matches compressed oops printing flags
1700 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1701 jio_fprintf(defaultStream::error_stream(),
1702 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1703 " (" UINTX_FORMAT "G) which is greater than value given "
1704 UINTX_FORMAT "\n",
1705 DefaultHeapBaseMinAddress,
1706 DefaultHeapBaseMinAddress/G,
1707 HeapBaseMinAddress);
1708 }
1709 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1710 }
1711 }
1712
1713 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1714 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1715 // but it should be not less than default MaxHeapSize.
1716 max_coop_heap -= HeapBaseMinAddress;
1717 }
1718 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1719 }
1720 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1721
1722 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1723 // An initial heap size was specified on the command line,
1724 // so be sure that the maximum size is consistent. Done
1725 // after call to limit_by_allocatable_memory because that
1726 // method might reduce the allocation size.
1727 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1728 }
1729
1730 if (PrintGCDetails && Verbose) {
1731 // Cannot use gclog_or_tty yet.
1732 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1733 }
1734 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1735 }
1736
1737 // If the minimum or initial heap_size have not been set or requested to be set
1738 // ergonomically, set them accordingly.
1739 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1740 julong reasonable_minimum = (julong)(OldSize + NewSize);
1741
1742 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1743
1744 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1745
1746 if (InitialHeapSize == 0) {
1747 julong reasonable_initial = phys_mem / InitialRAMFraction;
1748
1749 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1750 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1751
1752 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1753
1754 if (PrintGCDetails && Verbose) {
1755 // Cannot use gclog_or_tty yet.
1756 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1757 }
1758 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1759 }
1760 // If the minimum heap size has not been set (via -Xms),
1761 // synchronize with InitialHeapSize to avoid errors with the default value.
1762 if (min_heap_size() == 0) {
1763 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1764 if (PrintGCDetails && Verbose) {
1765 // Cannot use gclog_or_tty yet.
1766 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1767 }
1768 }
1769 }
1770 }
1771
1772 // This must be called after ergonomics because we want bytecode rewriting
1773 // if the server compiler is used, or if UseSharedSpaces is disabled.
1774 void Arguments::set_bytecode_flags() {
1775 // Better not attempt to store into a read-only space.
1776 if (UseSharedSpaces) {
1777 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1778 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1779 }
1780
1781 if (!RewriteBytecodes) {
1782 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1783 }
1784 }
1785
1786 // Aggressive optimization flags -XX:+AggressiveOpts
1787 void Arguments::set_aggressive_opts_flags() {
1788 #ifdef COMPILER2
1789 if (AggressiveUnboxing) {
1790 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1791 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1792 } else if (!EliminateAutoBox) {
1793 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1794 AggressiveUnboxing = false;
1795 }
1796 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1797 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1798 } else if (!DoEscapeAnalysis) {
1799 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1800 AggressiveUnboxing = false;
1801 }
1802 }
1803 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1804 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1805 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1806 }
1807 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1808 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1809 }
1810
1811 // Feed the cache size setting into the JDK
1812 char buffer[1024];
1813 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1814 add_property(buffer);
1815 }
1816 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1817 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1818 }
1819 #endif
1820
1821 if (AggressiveOpts) {
1822 // Sample flag setting code
1823 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1824 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1825 // }
1826 }
1827 }
1828
1829 //===========================================================================================================
1830 // Parsing of java.compiler property
1831
1832 void Arguments::process_java_compiler_argument(char* arg) {
1833 // For backwards compatibility, Djava.compiler=NONE or ""
1834 // causes us to switch to -Xint mode UNLESS -Xdebug
1835 // is also specified.
1836 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1837 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1838 }
1839 }
1840
1841 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1842 _sun_java_launcher = strdup(launcher);
1843 }
1844
1845 bool Arguments::created_by_java_launcher() {
1846 assert(_sun_java_launcher != NULL, "property must have value");
1847 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1848 }
1849
1850 bool Arguments::sun_java_launcher_is_altjvm() {
1851 return _sun_java_launcher_is_altjvm;
1852 }
1853
1854 //===========================================================================================================
1855 // Parsing of main arguments
1856
1857 bool Arguments::verify_interval(uintx val, uintx min,
1858 uintx max, const char* name) {
1859 // Returns true iff value is in the inclusive interval [min..max]
1860 // false, otherwise.
1861 if (val >= min && val <= max) {
1862 return true;
1863 }
1864 jio_fprintf(defaultStream::error_stream(),
1865 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1866 " and " UINTX_FORMAT "\n",
1867 name, val, min, max);
1868 return false;
1869 }
1870
1871 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1872 // Returns true if given value is at least specified min threshold
1873 // false, otherwise.
1874 if (val >= min ) {
1875 return true;
1876 }
1877 jio_fprintf(defaultStream::error_stream(),
1878 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1879 name, val, min);
1880 return false;
1881 }
1882
1883 bool Arguments::verify_percentage(uintx value, const char* name) {
1884 if (is_percentage(value)) {
1885 return true;
1886 }
1887 jio_fprintf(defaultStream::error_stream(),
1888 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1889 name, value);
1890 return false;
1891 }
1892
1893 #if !INCLUDE_ALL_GCS
1894 #ifdef ASSERT
1895 static bool verify_serial_gc_flags() {
1896 return (UseSerialGC &&
1897 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1898 UseParallelGC || UseParallelOldGC));
1899 }
1900 #endif // ASSERT
1901 #endif // INCLUDE_ALL_GCS
1902
1903 // check if do gclog rotation
1904 // +UseGCLogFileRotation is a must,
1905 // no gc log rotation when log file not supplied or
1906 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1907 void check_gclog_consistency() {
1908 if (UseGCLogFileRotation) {
1909 if ((Arguments::gc_log_filename() == NULL) ||
1910 (NumberOfGCLogFiles == 0) ||
1911 (GCLogFileSize == 0)) {
1912 jio_fprintf(defaultStream::output_stream(),
1913 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>[k|K|m|M|g|G]\n"
1914 "where num_of_file > 0 and num_of_size > 0\n"
1915 "GC log rotation is turned off\n");
1916 UseGCLogFileRotation = false;
1917 }
1918 }
1919
1920 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1921 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1922 jio_fprintf(defaultStream::output_stream(),
1923 "GCLogFileSize changed to minimum 8K\n");
1924 }
1925 }
1926
1927 // This function is called for -Xloggc:<filename>, it can be used
1928 // to check if a given file name(or string) conforms to the following
1929 // specification:
1930 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1931 // %p and %t only allowed once. We only limit usage of filename not path
1932 bool is_filename_valid(const char *file_name) {
1933 const char* p = file_name;
1934 char file_sep = os::file_separator()[0];
1935 const char* cp;
1936 // skip prefix path
1937 for (cp = file_name; *cp != '\0'; cp++) {
1938 if (*cp == '/' || *cp == file_sep) {
1939 p = cp + 1;
1940 }
1941 }
1942
1943 int count_p = 0;
1944 int count_t = 0;
1945 while (*p != '\0') {
1946 if ((*p >= '0' && *p <= '9') ||
1947 (*p >= 'A' && *p <= 'Z') ||
1948 (*p >= 'a' && *p <= 'z') ||
1949 *p == '-' ||
1950 *p == '_' ||
1951 *p == '.') {
1952 p++;
1953 continue;
1954 }
1955 if (*p == '%') {
1956 if(*(p + 1) == 'p') {
1957 p += 2;
1958 count_p ++;
1959 continue;
1960 }
1961 if (*(p + 1) == 't') {
1962 p += 2;
1963 count_t ++;
1964 continue;
1965 }
1966 }
1967 return false;
1968 }
1969 return count_p < 2 && count_t < 2;
1970 }
1971
1972 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
1973 if (!is_percentage(min_heap_free_ratio)) {
1974 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
1975 return false;
1976 }
1977 if (min_heap_free_ratio > MaxHeapFreeRatio) {
1978 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1979 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
1980 MaxHeapFreeRatio);
1981 return false;
1982 }
1983 return true;
1984 }
1985
1986 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
1987 if (!is_percentage(max_heap_free_ratio)) {
1988 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
1989 return false;
1990 }
1991 if (max_heap_free_ratio < MinHeapFreeRatio) {
1992 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
1993 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
1994 MinHeapFreeRatio);
1995 return false;
1996 }
1997 return true;
1998 }
1999
2000 // Check consistency of GC selection
2001 bool Arguments::check_gc_consistency() {
2002 check_gclog_consistency();
2003 bool status = true;
2004 // Ensure that the user has not selected conflicting sets
2005 // of collectors. [Note: this check is merely a user convenience;
2006 // collectors over-ride each other so that only a non-conflicting
2007 // set is selected; however what the user gets is not what they
2008 // may have expected from the combination they asked for. It's
2009 // better to reduce user confusion by not allowing them to
2010 // select conflicting combinations.
2011 uint i = 0;
2012 if (UseSerialGC) i++;
2013 if (UseConcMarkSweepGC || UseParNewGC) i++;
2014 if (UseParallelGC || UseParallelOldGC) i++;
2015 if (UseG1GC) i++;
2016 if (i > 1) {
2017 jio_fprintf(defaultStream::error_stream(),
2018 "Conflicting collector combinations in option list; "
2019 "please refer to the release notes for the combinations "
2020 "allowed\n");
2021 status = false;
2022 }
2023 return status;
2024 }
2025
2026 void Arguments::check_deprecated_gcs() {
2027 if (UseConcMarkSweepGC && !UseParNewGC) {
2028 warning("Using the DefNew young collector with the CMS collector is deprecated "
2029 "and will likely be removed in a future release");
2030 }
2031
2032 if (UseParNewGC && !UseConcMarkSweepGC) {
2033 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2034 // set up UseSerialGC properly, so that can't be used in the check here.
2035 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2036 "and will likely be removed in a future release");
2037 }
2038
2039 if (CMSIncrementalMode) {
2040 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2041 }
2042 }
2043
2044 void Arguments::check_deprecated_gc_flags() {
2045 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2046 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2047 "and will likely be removed in future release");
2048 }
2049 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2050 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2051 "Use MaxRAMFraction instead.");
2052 }
2053 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2054 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2055 }
2056 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2057 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2058 }
2059 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2060 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2061 }
2062 }
2063
2064 // Check stack pages settings
2065 bool Arguments::check_stack_pages()
2066 {
2067 bool status = true;
2068 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2069 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2070 // greater stack shadow pages can't generate instruction to bang stack
2071 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2072 return status;
2073 }
2074
2075 // Check the consistency of vm_init_args
2076 bool Arguments::check_vm_args_consistency() {
2077 // Method for adding checks for flag consistency.
2078 // The intent is to warn the user of all possible conflicts,
2079 // before returning an error.
2080 // Note: Needs platform-dependent factoring.
2081 bool status = true;
2082
2083 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2084 // builds so the cost of stack banging can be measured.
2085 #if (defined(PRODUCT) && defined(SOLARIS))
2086 if (!UseBoundThreads && !UseStackBanging) {
2087 jio_fprintf(defaultStream::error_stream(),
2088 "-UseStackBanging conflicts with -UseBoundThreads\n");
2089
2090 status = false;
2091 }
2092 #endif
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("");
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 : 1;
2413 status &=verify_min_value(CICompilerCount, num_min_compiler_threads, "CICompilerCount");
2414
2415 return status;
2416 }
2417
2418 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2419 const char* option_type) {
2420 if (ignore) return false;
2421
2422 const char* spacer = " ";
2423 if (option_type == NULL) {
2424 option_type = ++spacer; // Set both to the empty string.
2425 }
2426
2427 if (os::obsolete_option(option)) {
2428 jio_fprintf(defaultStream::error_stream(),
2429 "Obsolete %s%soption: %s\n", option_type, spacer,
2430 option->optionString);
2431 return false;
2432 } else {
2433 jio_fprintf(defaultStream::error_stream(),
2434 "Unrecognized %s%soption: %s\n", option_type, spacer,
2435 option->optionString);
2436 return true;
2437 }
2438 }
2439
2440 static const char* user_assertion_options[] = {
2441 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2442 };
2443
2444 static const char* system_assertion_options[] = {
2445 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2446 };
2447
2448 // Return true if any of the strings in null-terminated array 'names' matches.
2449 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2450 // the option must match exactly.
2451 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2452 bool tail_allowed) {
2453 for (/* empty */; *names != NULL; ++names) {
2454 if (match_option(option, *names, tail)) {
2455 if (**tail == '\0' || tail_allowed && **tail == ':') {
2456 return true;
2457 }
2458 }
2459 }
2460 return false;
2461 }
2462
2463 bool Arguments::parse_uintx(const char* value,
2464 uintx* uintx_arg,
2465 uintx min_size) {
2466
2467 // Check the sign first since atomull() parses only unsigned values.
2468 bool value_is_positive = !(*value == '-');
2469
2470 if (value_is_positive) {
2471 julong n;
2472 bool good_return = atomull(value, &n);
2473 if (good_return) {
2474 bool above_minimum = n >= min_size;
2475 bool value_is_too_large = n > max_uintx;
2476
2477 if (above_minimum && !value_is_too_large) {
2478 *uintx_arg = n;
2479 return true;
2480 }
2481 }
2482 }
2483 return false;
2484 }
2485
2486 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2487 julong* long_arg,
2488 julong min_size) {
2489 if (!atomull(s, long_arg)) return arg_unreadable;
2490 return check_memory_size(*long_arg, min_size);
2491 }
2492
2493 // Parse JavaVMInitArgs structure
2494
2495 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2496 // For components of the system classpath.
2497 SysClassPath scp(Arguments::get_sysclasspath());
2498 bool scp_assembly_required = false;
2499
2500 // Save default settings for some mode flags
2501 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2502 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2503 Arguments::_ClipInlining = ClipInlining;
2504 Arguments::_BackgroundCompilation = BackgroundCompilation;
2505
2506 // Setup flags for mixed which is the default
2507 set_mode_flags(_mixed);
2508
2509 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2510 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2511 if (result != JNI_OK) {
2512 return result;
2513 }
2514
2515 // Parse JavaVMInitArgs structure passed in
2516 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2517 if (result != JNI_OK) {
2518 return result;
2519 }
2520
2521 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2522 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2523 if (result != JNI_OK) {
2524 return result;
2525 }
2526
2527 // Do final processing now that all arguments have been parsed
2528 result = finalize_vm_init_args(&scp, scp_assembly_required);
2529 if (result != JNI_OK) {
2530 return result;
2531 }
2532
2533 return JNI_OK;
2534 }
2535
2536 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2537 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2538 // are dealing with -agentpath (case where name is a path), otherwise with
2539 // -agentlib
2540 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2541 char *_name;
2542 const char *_hprof = "hprof", *_jdwp = "jdwp";
2543 size_t _len_hprof, _len_jdwp, _len_prefix;
2544
2545 if (is_path) {
2546 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2547 return false;
2548 }
2549
2550 _name++; // skip past last path separator
2551 _len_prefix = strlen(JNI_LIB_PREFIX);
2552
2553 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2554 return false;
2555 }
2556
2557 _name += _len_prefix;
2558 _len_hprof = strlen(_hprof);
2559 _len_jdwp = strlen(_jdwp);
2560
2561 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2562 _name += _len_hprof;
2563 }
2564 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2565 _name += _len_jdwp;
2566 }
2567 else {
2568 return false;
2569 }
2570
2571 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2572 return false;
2573 }
2574
2575 return true;
2576 }
2577
2578 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2579 return true;
2580 }
2581
2582 return false;
2583 }
2584
2585 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2586 SysClassPath* scp_p,
2587 bool* scp_assembly_required_p,
2588 Flag::Flags origin) {
2589 // Remaining part of option string
2590 const char* tail;
2591
2592 // iterate over arguments
2593 for (int index = 0; index < args->nOptions; index++) {
2594 bool is_absolute_path = false; // for -agentpath vs -agentlib
2595
2596 const JavaVMOption* option = args->options + index;
2597
2598 if (!match_option(option, "-Djava.class.path", &tail) &&
2599 !match_option(option, "-Dsun.java.command", &tail) &&
2600 !match_option(option, "-Dsun.java.launcher", &tail)) {
2601
2602 // add all jvm options to the jvm_args string. This string
2603 // is used later to set the java.vm.args PerfData string constant.
2604 // the -Djava.class.path and the -Dsun.java.command options are
2605 // omitted from jvm_args string as each have their own PerfData
2606 // string constant object.
2607 build_jvm_args(option->optionString);
2608 }
2609
2610 // -verbose:[class/gc/jni]
2611 if (match_option(option, "-verbose", &tail)) {
2612 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2613 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2614 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2615 } else if (!strcmp(tail, ":gc")) {
2616 FLAG_SET_CMDLINE(bool, PrintGC, true);
2617 } else if (!strcmp(tail, ":jni")) {
2618 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2619 }
2620 // -da / -ea / -disableassertions / -enableassertions
2621 // These accept an optional class/package name separated by a colon, e.g.,
2622 // -da:java.lang.Thread.
2623 } else if (match_option(option, user_assertion_options, &tail, true)) {
2624 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2625 if (*tail == '\0') {
2626 JavaAssertions::setUserClassDefault(enable);
2627 } else {
2628 assert(*tail == ':', "bogus match by match_option()");
2629 JavaAssertions::addOption(tail + 1, enable);
2630 }
2631 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2632 } else if (match_option(option, system_assertion_options, &tail, false)) {
2633 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2634 JavaAssertions::setSystemClassDefault(enable);
2635 // -bootclasspath:
2636 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2637 scp_p->reset_path(tail);
2638 *scp_assembly_required_p = true;
2639 // -bootclasspath/a:
2640 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2641 scp_p->add_suffix(tail);
2642 *scp_assembly_required_p = true;
2643 // -bootclasspath/p:
2644 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2645 scp_p->add_prefix(tail);
2646 *scp_assembly_required_p = true;
2647 // -Xrun
2648 } else if (match_option(option, "-Xrun", &tail)) {
2649 if (tail != NULL) {
2650 const char* pos = strchr(tail, ':');
2651 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2652 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2653 name[len] = '\0';
2654
2655 char *options = NULL;
2656 if(pos != NULL) {
2657 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2658 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2659 }
2660 #if !INCLUDE_JVMTI
2661 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2662 jio_fprintf(defaultStream::error_stream(),
2663 "Profiling and debugging agents are not supported in this VM\n");
2664 return JNI_ERR;
2665 }
2666 #endif // !INCLUDE_JVMTI
2667 add_init_library(name, options);
2668 }
2669 // -agentlib and -agentpath
2670 } else if (match_option(option, "-agentlib:", &tail) ||
2671 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2672 if(tail != NULL) {
2673 const char* pos = strchr(tail, '=');
2674 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2675 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2676 name[len] = '\0';
2677
2678 char *options = NULL;
2679 if(pos != NULL) {
2680 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2681 }
2682 #if !INCLUDE_JVMTI
2683 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2684 jio_fprintf(defaultStream::error_stream(),
2685 "Profiling and debugging agents are not supported in this VM\n");
2686 return JNI_ERR;
2687 }
2688 #endif // !INCLUDE_JVMTI
2689 add_init_agent(name, options, is_absolute_path);
2690 }
2691 // -javaagent
2692 } else if (match_option(option, "-javaagent:", &tail)) {
2693 #if !INCLUDE_JVMTI
2694 jio_fprintf(defaultStream::error_stream(),
2695 "Instrumentation agents are not supported in this VM\n");
2696 return JNI_ERR;
2697 #else
2698 if(tail != NULL) {
2699 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2700 add_init_agent("instrument", options, false);
2701 }
2702 #endif // !INCLUDE_JVMTI
2703 // -Xnoclassgc
2704 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2705 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2706 // -Xincgc: i-CMS
2707 } else if (match_option(option, "-Xincgc", &tail)) {
2708 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2709 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2710 // -Xnoincgc: no i-CMS
2711 } else if (match_option(option, "-Xnoincgc", &tail)) {
2712 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2713 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2714 // -Xconcgc
2715 } else if (match_option(option, "-Xconcgc", &tail)) {
2716 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2717 // -Xnoconcgc
2718 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2719 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2720 // -Xbatch
2721 } else if (match_option(option, "-Xbatch", &tail)) {
2722 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2723 // -Xmn for compatibility with other JVM vendors
2724 } else if (match_option(option, "-Xmn", &tail)) {
2725 julong long_initial_young_size = 0;
2726 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2727 if (errcode != arg_in_range) {
2728 jio_fprintf(defaultStream::error_stream(),
2729 "Invalid initial young generation size: %s\n", option->optionString);
2730 describe_range_error(errcode);
2731 return JNI_EINVAL;
2732 }
2733 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2734 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2735 // -Xms
2736 } else if (match_option(option, "-Xms", &tail)) {
2737 julong long_initial_heap_size = 0;
2738 // an initial heap size of 0 means automatically determine
2739 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2740 if (errcode != arg_in_range) {
2741 jio_fprintf(defaultStream::error_stream(),
2742 "Invalid initial heap size: %s\n", option->optionString);
2743 describe_range_error(errcode);
2744 return JNI_EINVAL;
2745 }
2746 set_min_heap_size((uintx)long_initial_heap_size);
2747 // Currently the minimum size and the initial heap sizes are the same.
2748 // Can be overridden with -XX:InitialHeapSize.
2749 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2750 // -Xmx
2751 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2752 julong long_max_heap_size = 0;
2753 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2754 if (errcode != arg_in_range) {
2755 jio_fprintf(defaultStream::error_stream(),
2756 "Invalid maximum heap size: %s\n", option->optionString);
2757 describe_range_error(errcode);
2758 return JNI_EINVAL;
2759 }
2760 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2761 // Xmaxf
2762 } else if (match_option(option, "-Xmaxf", &tail)) {
2763 char* err;
2764 int maxf = (int)(strtod(tail, &err) * 100);
2765 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2766 jio_fprintf(defaultStream::error_stream(),
2767 "Bad max heap free percentage size: %s\n",
2768 option->optionString);
2769 return JNI_EINVAL;
2770 } else {
2771 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2772 }
2773 // Xminf
2774 } else if (match_option(option, "-Xminf", &tail)) {
2775 char* err;
2776 int minf = (int)(strtod(tail, &err) * 100);
2777 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2778 jio_fprintf(defaultStream::error_stream(),
2779 "Bad min heap free percentage size: %s\n",
2780 option->optionString);
2781 return JNI_EINVAL;
2782 } else {
2783 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2784 }
2785 // -Xss
2786 } else if (match_option(option, "-Xss", &tail)) {
2787 julong long_ThreadStackSize = 0;
2788 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2789 if (errcode != arg_in_range) {
2790 jio_fprintf(defaultStream::error_stream(),
2791 "Invalid thread stack size: %s\n", option->optionString);
2792 describe_range_error(errcode);
2793 return JNI_EINVAL;
2794 }
2795 // Internally track ThreadStackSize in units of 1024 bytes.
2796 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2797 round_to((int)long_ThreadStackSize, K) / K);
2798 // -Xoss
2799 } else if (match_option(option, "-Xoss", &tail)) {
2800 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2801 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2802 julong long_CodeCacheExpansionSize = 0;
2803 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2804 if (errcode != arg_in_range) {
2805 jio_fprintf(defaultStream::error_stream(),
2806 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2807 os::vm_page_size()/K);
2808 return JNI_EINVAL;
2809 }
2810 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2811 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2812 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2813 julong long_ReservedCodeCacheSize = 0;
2814
2815 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2816 if (errcode != arg_in_range) {
2817 jio_fprintf(defaultStream::error_stream(),
2818 "Invalid maximum code cache size: %s.\n", option->optionString);
2819 return JNI_EINVAL;
2820 }
2821 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2822 //-XX:IncreaseFirstTierCompileThresholdAt=
2823 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2824 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2825 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2826 jio_fprintf(defaultStream::error_stream(),
2827 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2828 option->optionString);
2829 return JNI_EINVAL;
2830 }
2831 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2832 // -green
2833 } else if (match_option(option, "-green", &tail)) {
2834 jio_fprintf(defaultStream::error_stream(),
2835 "Green threads support not available\n");
2836 return JNI_EINVAL;
2837 // -native
2838 } else if (match_option(option, "-native", &tail)) {
2839 // HotSpot always uses native threads, ignore silently for compatibility
2840 // -Xsqnopause
2841 } else if (match_option(option, "-Xsqnopause", &tail)) {
2842 // EVM option, ignore silently for compatibility
2843 // -Xrs
2844 } else if (match_option(option, "-Xrs", &tail)) {
2845 // Classic/EVM option, new functionality
2846 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2847 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2848 // change default internal VM signals used - lower case for back compat
2849 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2850 // -Xoptimize
2851 } else if (match_option(option, "-Xoptimize", &tail)) {
2852 // EVM option, ignore silently for compatibility
2853 // -Xprof
2854 } else if (match_option(option, "-Xprof", &tail)) {
2855 #if INCLUDE_FPROF
2856 _has_profile = true;
2857 #else // INCLUDE_FPROF
2858 jio_fprintf(defaultStream::error_stream(),
2859 "Flat profiling is not supported in this VM.\n");
2860 return JNI_ERR;
2861 #endif // INCLUDE_FPROF
2862 // -Xconcurrentio
2863 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2864 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2865 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2866 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2867 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2868 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2869
2870 // -Xinternalversion
2871 } else if (match_option(option, "-Xinternalversion", &tail)) {
2872 jio_fprintf(defaultStream::output_stream(), "%s\n",
2873 VM_Version::internal_vm_info_string());
2874 vm_exit(0);
2875 #ifndef PRODUCT
2876 // -Xprintflags
2877 } else if (match_option(option, "-Xprintflags", &tail)) {
2878 CommandLineFlags::printFlags(tty, false);
2879 vm_exit(0);
2880 #endif
2881 // -D
2882 } else if (match_option(option, "-D", &tail)) {
2883 if (!add_property(tail)) {
2884 return JNI_ENOMEM;
2885 }
2886 // Out of the box management support
2887 if (match_option(option, "-Dcom.sun.management", &tail)) {
2888 #if INCLUDE_MANAGEMENT
2889 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2890 #else
2891 jio_fprintf(defaultStream::output_stream(),
2892 "-Dcom.sun.management is not supported in this VM.\n");
2893 return JNI_ERR;
2894 #endif
2895 }
2896 // -Xint
2897 } else if (match_option(option, "-Xint", &tail)) {
2898 set_mode_flags(_int);
2899 // -Xmixed
2900 } else if (match_option(option, "-Xmixed", &tail)) {
2901 set_mode_flags(_mixed);
2902 // -Xcomp
2903 } else if (match_option(option, "-Xcomp", &tail)) {
2904 // for testing the compiler; turn off all flags that inhibit compilation
2905 set_mode_flags(_comp);
2906 // -Xshare:dump
2907 } else if (match_option(option, "-Xshare:dump", &tail)) {
2908 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2909 set_mode_flags(_int); // Prevent compilation, which creates objects
2910 // -Xshare:on
2911 } else if (match_option(option, "-Xshare:on", &tail)) {
2912 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2913 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2914 // -Xshare:auto
2915 } else if (match_option(option, "-Xshare:auto", &tail)) {
2916 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2917 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2918 // -Xshare:off
2919 } else if (match_option(option, "-Xshare:off", &tail)) {
2920 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2921 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2922 // -Xverify
2923 } else if (match_option(option, "-Xverify", &tail)) {
2924 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2925 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2926 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2927 } else if (strcmp(tail, ":remote") == 0) {
2928 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2929 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2930 } else if (strcmp(tail, ":none") == 0) {
2931 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2932 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2933 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2934 return JNI_EINVAL;
2935 }
2936 // -Xdebug
2937 } else if (match_option(option, "-Xdebug", &tail)) {
2938 // note this flag has been used, then ignore
2939 set_xdebug_mode(true);
2940 // -Xnoagent
2941 } else if (match_option(option, "-Xnoagent", &tail)) {
2942 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2943 } else if (match_option(option, "-Xboundthreads", &tail)) {
2944 // Bind user level threads to kernel threads (Solaris only)
2945 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2946 } else if (match_option(option, "-Xloggc:", &tail)) {
2947 // Redirect GC output to the file. -Xloggc:<filename>
2948 // ostream_init_log(), when called will use this filename
2949 // to initialize a fileStream.
2950 _gc_log_filename = strdup(tail);
2951 if (!is_filename_valid(_gc_log_filename)) {
2952 jio_fprintf(defaultStream::output_stream(),
2953 "Invalid file name for use with -Xloggc: Filename can only contain the "
2954 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2955 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2956 return JNI_EINVAL;
2957 }
2958 FLAG_SET_CMDLINE(bool, PrintGC, true);
2959 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2960
2961 // JNI hooks
2962 } else if (match_option(option, "-Xcheck", &tail)) {
2963 if (!strcmp(tail, ":jni")) {
2964 #if !INCLUDE_JNI_CHECK
2965 warning("JNI CHECKING is not supported in this VM");
2966 #else
2967 CheckJNICalls = true;
2968 #endif // INCLUDE_JNI_CHECK
2969 } else if (is_bad_option(option, args->ignoreUnrecognized,
2970 "check")) {
2971 return JNI_EINVAL;
2972 }
2973 } else if (match_option(option, "vfprintf", &tail)) {
2974 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2975 } else if (match_option(option, "exit", &tail)) {
2976 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2977 } else if (match_option(option, "abort", &tail)) {
2978 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2979 // -XX:+AggressiveHeap
2980 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2981
2982 // This option inspects the machine and attempts to set various
2983 // parameters to be optimal for long-running, memory allocation
2984 // intensive jobs. It is intended for machines with large
2985 // amounts of cpu and memory.
2986
2987 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2988 // VM, but we may not be able to represent the total physical memory
2989 // available (like having 8gb of memory on a box but using a 32bit VM).
2990 // Thus, we need to make sure we're using a julong for intermediate
2991 // calculations.
2992 julong initHeapSize;
2993 julong total_memory = os::physical_memory();
2994
2995 if (total_memory < (julong)256*M) {
2996 jio_fprintf(defaultStream::error_stream(),
2997 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2998 vm_exit(1);
2999 }
3000
3001 // The heap size is half of available memory, or (at most)
3002 // all of possible memory less 160mb (leaving room for the OS
3003 // when using ISM). This is the maximum; because adaptive sizing
3004 // is turned on below, the actual space used may be smaller.
3005
3006 initHeapSize = MIN2(total_memory / (julong)2,
3007 total_memory - (julong)160*M);
3008
3009 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3010
3011 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3012 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3013 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3014 // Currently the minimum size and the initial heap sizes are the same.
3015 set_min_heap_size(initHeapSize);
3016 }
3017 if (FLAG_IS_DEFAULT(NewSize)) {
3018 // Make the young generation 3/8ths of the total heap.
3019 FLAG_SET_CMDLINE(uintx, NewSize,
3020 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3021 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3022 }
3023
3024 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3025 FLAG_SET_DEFAULT(UseLargePages, true);
3026 #endif
3027
3028 // Increase some data structure sizes for efficiency
3029 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3030 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3031 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3032
3033 // See the OldPLABSize comment below, but replace 'after promotion'
3034 // with 'after copying'. YoungPLABSize is the size of the survivor
3035 // space per-gc-thread buffers. The default is 4kw.
3036 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3037
3038 // OldPLABSize is the size of the buffers in the old gen that
3039 // UseParallelGC uses to promote live data that doesn't fit in the
3040 // survivor spaces. At any given time, there's one for each gc thread.
3041 // The default size is 1kw. These buffers are rarely used, since the
3042 // survivor spaces are usually big enough. For specjbb, however, there
3043 // are occasions when there's lots of live data in the young gen
3044 // and we end up promoting some of it. We don't have a definite
3045 // explanation for why bumping OldPLABSize helps, but the theory
3046 // is that a bigger PLAB results in retaining something like the
3047 // original allocation order after promotion, which improves mutator
3048 // locality. A minor effect may be that larger PLABs reduce the
3049 // number of PLAB allocation events during gc. The value of 8kw
3050 // was arrived at by experimenting with specjbb.
3051 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3052
3053 // Enable parallel GC and adaptive generation sizing
3054 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3055 FLAG_SET_DEFAULT(ParallelGCThreads,
3056 Abstract_VM_Version::parallel_worker_threads());
3057
3058 // Encourage steady state memory management
3059 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3060
3061 // This appears to improve mutator locality
3062 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3063
3064 // Get around early Solaris scheduling bug
3065 // (affinity vs other jobs on system)
3066 // but disallow DR and offlining (5008695).
3067 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3068
3069 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3070 // and the last option wins.
3071 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3072 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3073 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3074 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3075 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3076 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3077 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3078 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3079 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3080 uintx max_tenuring_thresh = 0;
3081 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3082 jio_fprintf(defaultStream::error_stream(),
3083 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3084 }
3085 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3086
3087 if (MaxTenuringThreshold == 0) {
3088 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3089 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3090 } else {
3091 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3092 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3093 }
3094 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3095 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3096 jio_fprintf(defaultStream::error_stream(),
3097 "Please use CMSClassUnloadingEnabled in place of "
3098 "CMSPermGenSweepingEnabled in the future\n");
3099 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3100 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3101 jio_fprintf(defaultStream::error_stream(),
3102 "Please use -XX:+UseGCOverheadLimit in place of "
3103 "-XX:+UseGCTimeLimit in the future\n");
3104 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3105 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3106 jio_fprintf(defaultStream::error_stream(),
3107 "Please use -XX:-UseGCOverheadLimit in place of "
3108 "-XX:-UseGCTimeLimit in the future\n");
3109 // The TLE options are for compatibility with 1.3 and will be
3110 // removed without notice in a future release. These options
3111 // are not to be documented.
3112 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3113 // No longer used.
3114 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3115 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3116 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3117 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3118 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3119 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3120 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3121 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3122 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3123 // No longer used.
3124 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3125 julong long_tlab_size = 0;
3126 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3127 if (errcode != arg_in_range) {
3128 jio_fprintf(defaultStream::error_stream(),
3129 "Invalid TLAB size: %s\n", option->optionString);
3130 describe_range_error(errcode);
3131 return JNI_EINVAL;
3132 }
3133 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3134 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3135 // No longer used.
3136 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3137 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3138 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3139 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3140 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3141 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3142 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3143 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3144 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3145 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3146 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3147 #if defined(DTRACE_ENABLED)
3148 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3149 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3150 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3151 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3152 #else // defined(DTRACE_ENABLED)
3153 jio_fprintf(defaultStream::error_stream(),
3154 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3155 return JNI_EINVAL;
3156 #endif // defined(DTRACE_ENABLED)
3157 #ifdef ASSERT
3158 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3159 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3160 // disable scavenge before parallel mark-compact
3161 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3162 #endif
3163 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3164 julong cms_blocks_to_claim = (julong)atol(tail);
3165 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3166 jio_fprintf(defaultStream::error_stream(),
3167 "Please use -XX:OldPLABSize in place of "
3168 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3169 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3170 julong cms_blocks_to_claim = (julong)atol(tail);
3171 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3172 jio_fprintf(defaultStream::error_stream(),
3173 "Please use -XX:OldPLABSize in place of "
3174 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3175 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3176 julong old_plab_size = 0;
3177 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3178 if (errcode != arg_in_range) {
3179 jio_fprintf(defaultStream::error_stream(),
3180 "Invalid old PLAB size: %s\n", option->optionString);
3181 describe_range_error(errcode);
3182 return JNI_EINVAL;
3183 }
3184 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3185 jio_fprintf(defaultStream::error_stream(),
3186 "Please use -XX:OldPLABSize in place of "
3187 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3188 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3189 julong young_plab_size = 0;
3190 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3191 if (errcode != arg_in_range) {
3192 jio_fprintf(defaultStream::error_stream(),
3193 "Invalid young PLAB size: %s\n", option->optionString);
3194 describe_range_error(errcode);
3195 return JNI_EINVAL;
3196 }
3197 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3198 jio_fprintf(defaultStream::error_stream(),
3199 "Please use -XX:YoungPLABSize in place of "
3200 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3201 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3202 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3203 julong stack_size = 0;
3204 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3205 if (errcode != arg_in_range) {
3206 jio_fprintf(defaultStream::error_stream(),
3207 "Invalid mark stack size: %s\n", option->optionString);
3208 describe_range_error(errcode);
3209 return JNI_EINVAL;
3210 }
3211 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3212 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3213 julong max_stack_size = 0;
3214 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3215 if (errcode != arg_in_range) {
3216 jio_fprintf(defaultStream::error_stream(),
3217 "Invalid maximum mark stack size: %s\n",
3218 option->optionString);
3219 describe_range_error(errcode);
3220 return JNI_EINVAL;
3221 }
3222 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3223 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3224 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3225 uintx conc_threads = 0;
3226 if (!parse_uintx(tail, &conc_threads, 1)) {
3227 jio_fprintf(defaultStream::error_stream(),
3228 "Invalid concurrent threads: %s\n", option->optionString);
3229 return JNI_EINVAL;
3230 }
3231 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3232 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3233 julong max_direct_memory_size = 0;
3234 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3235 if (errcode != arg_in_range) {
3236 jio_fprintf(defaultStream::error_stream(),
3237 "Invalid maximum direct memory size: %s\n",
3238 option->optionString);
3239 describe_range_error(errcode);
3240 return JNI_EINVAL;
3241 }
3242 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3243 #if !INCLUDE_MANAGEMENT
3244 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3245 jio_fprintf(defaultStream::error_stream(),
3246 "ManagementServer is not supported in this VM.\n");
3247 return JNI_ERR;
3248 #endif // INCLUDE_MANAGEMENT
3249 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3250 // Skip -XX:Flags= since that case has already been handled
3251 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3252 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3253 return JNI_EINVAL;
3254 }
3255 }
3256 // Unknown option
3257 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3258 return JNI_ERR;
3259 }
3260 }
3261
3262 // Change the default value for flags which have different default values
3263 // when working with older JDKs.
3264 #ifdef LINUX
3265 if (JDK_Version::current().compare_major(6) <= 0 &&
3266 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3267 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3268 }
3269 #endif // LINUX
3270 return JNI_OK;
3271 }
3272
3273 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3274 // This must be done after all -D arguments have been processed.
3275 scp_p->expand_endorsed();
3276
3277 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3278 // Assemble the bootclasspath elements into the final path.
3279 Arguments::set_sysclasspath(scp_p->combined_path());
3280 }
3281
3282 // This must be done after all arguments have been processed.
3283 // java_compiler() true means set to "NONE" or empty.
3284 if (java_compiler() && !xdebug_mode()) {
3285 // For backwards compatibility, we switch to interpreted mode if
3286 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3287 // not specified.
3288 set_mode_flags(_int);
3289 }
3290 if (CompileThreshold == 0) {
3291 set_mode_flags(_int);
3292 }
3293
3294 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3295 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3296 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3297 }
3298
3299 #ifndef COMPILER2
3300 // Don't degrade server performance for footprint
3301 if (FLAG_IS_DEFAULT(UseLargePages) &&
3302 MaxHeapSize < LargePageHeapSizeThreshold) {
3303 // No need for large granularity pages w/small heaps.
3304 // Note that large pages are enabled/disabled for both the
3305 // Java heap and the code cache.
3306 FLAG_SET_DEFAULT(UseLargePages, false);
3307 }
3308
3309 #else
3310 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3311 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3312 }
3313 #endif
3314
3315 #ifndef TIERED
3316 // Tiered compilation is undefined.
3317 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3318 #endif
3319
3320 // If we are running in a headless jre, force java.awt.headless property
3321 // to be true unless the property has already been set.
3322 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3323 if (os::is_headless_jre()) {
3324 const char* headless = Arguments::get_property("java.awt.headless");
3325 if (headless == NULL) {
3326 char envbuffer[128];
3327 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3328 if (!add_property("java.awt.headless=true")) {
3329 return JNI_ENOMEM;
3330 }
3331 } else {
3332 char buffer[256];
3333 strcpy(buffer, "java.awt.headless=");
3334 strcat(buffer, envbuffer);
3335 if (!add_property(buffer)) {
3336 return JNI_ENOMEM;
3337 }
3338 }
3339 }
3340 }
3341
3342 if (!check_vm_args_consistency()) {
3343 return JNI_ERR;
3344 }
3345
3346 return JNI_OK;
3347 }
3348
3349 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3350 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3351 scp_assembly_required_p);
3352 }
3353
3354 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3355 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3356 scp_assembly_required_p);
3357 }
3358
3359 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3360 const int N_MAX_OPTIONS = 64;
3361 const int OPTION_BUFFER_SIZE = 1024;
3362 char buffer[OPTION_BUFFER_SIZE];
3363
3364 // The variable will be ignored if it exceeds the length of the buffer.
3365 // Don't check this variable if user has special privileges
3366 // (e.g. unix su command).
3367 if (os::getenv(name, buffer, sizeof(buffer)) &&
3368 !os::have_special_privileges()) {
3369 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3370
3371 bool suppress_message = false; // the message will be printed unless requested not to
3372 char message[OPTION_BUFFER_SIZE + 256]; // enough space for the options, message and the variable name
3373 jio_snprintf(message, sizeof(message), // message with the unmodidied yet buffer
3374 "Picked up %s: %s\n",
3375 name, buffer);
3376
3377 char* rd = buffer; // pointer to the input string (rd)
3378 int i;
3379 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3380 while (isspace(*rd)) rd++; // skip whitespace
3381 if (*rd == 0) break; // we re done when the input string is read completely
3382
3383 // The output, option string, overwrites the input string.
3384 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3385 // input string (rd).
3386 char* wrt = rd;
3387
3388 options[i].optionString = wrt; // Fill in option
3389
3390 // Check if we're requested to suppress the message about picking up options
3391 const char* tail;
3392 if (match_option(&options[i], "-XX:+SuppressJavaOptsOutput", &tail) &&
3393 (*tail == 0 || isspace(*tail))) {
3394 suppress_message = true;
3395 // remove the -XX:+SuppressJavaOptsOutput option from further processing
3396 rd += tail - rd;
3397 continue;
3398 }
3399
3400 i++;
3401 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3402 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3403 int quote = *rd; // matching quote to look for
3404 rd++; // don't copy open quote
3405 while (*rd != quote) { // include everything (even spaces) up until quote
3406 if (*rd == 0) { // string termination means unmatched string
3407 jio_fprintf(defaultStream::error_stream(),
3408 "%sUnmatched quote in %s\n",
3409 suppress_message ? "" : message, name);
3410 return JNI_ERR;
3411 }
3412 *wrt++ = *rd++; // copy to option string
3413 }
3414 rd++; // don't copy close quote
3415 } else {
3416 *wrt++ = *rd++; // copy to option string
3417 }
3418 }
3419 // Need to check if we're done before writing a NULL,
3420 // because the write could be to the byte that rd is pointing to.
3421 if (*rd++ == 0) {
3422 *wrt = 0;
3423 break;
3424 }
3425 *wrt = 0; // Zero terminate option
3426 }
3427 if (!suppress_message) {
3428 jio_fprintf(defaultStream::error_stream(), "%s", message);
3429 }
3430 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3431 JavaVMInitArgs vm_args;
3432 vm_args.version = JNI_VERSION_1_2;
3433 vm_args.options = options;
3434 vm_args.nOptions = i;
3435 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3436
3437 if (PrintVMOptions) {
3438 const char* tail;
3439 for (int i = 0; i < vm_args.nOptions; i++) {
3440 const JavaVMOption *option = vm_args.options + i;
3441 if (match_option(option, "-XX:", &tail)) {
3442 logOption(tail);
3443 }
3444 }
3445 }
3446
3447 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3448 }
3449 return JNI_OK;
3450 }
3451
3452 void Arguments::set_shared_spaces_flags() {
3453 if (DumpSharedSpaces) {
3454 if (RequireSharedSpaces) {
3455 warning("cannot dump shared archive while using shared archive");
3456 }
3457 UseSharedSpaces = false;
3458 #ifdef _LP64
3459 if (!UseCompressedOops || !UseCompressedClassPointers) {
3460 vm_exit_during_initialization(
3461 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3462 }
3463 } else {
3464 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3465 if (!UseCompressedOops || !UseCompressedClassPointers) {
3466 no_shared_spaces();
3467 }
3468 #endif
3469 }
3470 }
3471
3472 #if !INCLUDE_ALL_GCS
3473 static void force_serial_gc() {
3474 FLAG_SET_DEFAULT(UseSerialGC, true);
3475 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3476 UNSUPPORTED_GC_OPTION(UseG1GC);
3477 UNSUPPORTED_GC_OPTION(UseParallelGC);
3478 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3479 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3480 UNSUPPORTED_GC_OPTION(UseParNewGC);
3481 }
3482 #endif // INCLUDE_ALL_GCS
3483
3484 // Sharing support
3485 // Construct the path to the archive
3486 static char* get_shared_archive_path() {
3487 char *shared_archive_path;
3488 if (SharedArchiveFile == NULL) {
3489 char jvm_path[JVM_MAXPATHLEN];
3490 os::jvm_path(jvm_path, sizeof(jvm_path));
3491 char *end = strrchr(jvm_path, *os::file_separator());
3492 if (end != NULL) *end = '\0';
3493 size_t jvm_path_len = strlen(jvm_path);
3494 size_t file_sep_len = strlen(os::file_separator());
3495 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3496 file_sep_len + 20, mtInternal);
3497 if (shared_archive_path != NULL) {
3498 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3499 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3500 strncat(shared_archive_path, "classes.jsa", 11);
3501 }
3502 } else {
3503 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3504 if (shared_archive_path != NULL) {
3505 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3506 }
3507 }
3508 return shared_archive_path;
3509 }
3510
3511 #ifndef PRODUCT
3512 // Determine whether LogVMOutput should be implicitly turned on.
3513 static bool use_vm_log() {
3514 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3515 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3516 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3517 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3518 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3519 return true;
3520 }
3521
3522 #ifdef COMPILER1
3523 if (PrintC1Statistics) {
3524 return true;
3525 }
3526 #endif // COMPILER1
3527
3528 #ifdef COMPILER2
3529 if (PrintOptoAssembly || PrintOptoStatistics) {
3530 return true;
3531 }
3532 #endif // COMPILER2
3533
3534 return false;
3535 }
3536 #endif // PRODUCT
3537
3538 // Parse entry point called from JNI_CreateJavaVM
3539
3540 jint Arguments::parse(const JavaVMInitArgs* args) {
3541
3542 // Remaining part of option string
3543 const char* tail;
3544
3545 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3546 const char* hotspotrc = ".hotspotrc";
3547 bool settings_file_specified = false;
3548 bool needs_hotspotrc_warning = false;
3549
3550 const char* flags_file;
3551 int index;
3552 for (index = 0; index < args->nOptions; index++) {
3553 const JavaVMOption *option = args->options + index;
3554 if (match_option(option, "-XX:Flags=", &tail)) {
3555 flags_file = tail;
3556 settings_file_specified = true;
3557 }
3558 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3559 PrintVMOptions = true;
3560 }
3561 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3562 PrintVMOptions = false;
3563 }
3564 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3565 IgnoreUnrecognizedVMOptions = true;
3566 }
3567 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3568 IgnoreUnrecognizedVMOptions = false;
3569 }
3570 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3571 CommandLineFlags::printFlags(tty, false);
3572 vm_exit(0);
3573 }
3574 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3575 #if INCLUDE_NMT
3576 MemTracker::init_tracking_options(tail);
3577 #else
3578 jio_fprintf(defaultStream::error_stream(),
3579 "Native Memory Tracking is not supported in this VM\n");
3580 return JNI_ERR;
3581 #endif
3582 }
3583
3584
3585 #ifndef PRODUCT
3586 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3587 CommandLineFlags::printFlags(tty, true);
3588 vm_exit(0);
3589 }
3590 #endif
3591 }
3592
3593 if (IgnoreUnrecognizedVMOptions) {
3594 // uncast const to modify the flag args->ignoreUnrecognized
3595 *(jboolean*)(&args->ignoreUnrecognized) = true;
3596 }
3597
3598 // Parse specified settings file
3599 if (settings_file_specified) {
3600 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3601 return JNI_EINVAL;
3602 }
3603 } else {
3604 #ifdef ASSERT
3605 // Parse default .hotspotrc settings file
3606 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3607 return JNI_EINVAL;
3608 }
3609 #else
3610 struct stat buf;
3611 if (os::stat(hotspotrc, &buf) == 0) {
3612 needs_hotspotrc_warning = true;
3613 }
3614 #endif
3615 }
3616
3617 if (PrintVMOptions) {
3618 for (index = 0; index < args->nOptions; index++) {
3619 const JavaVMOption *option = args->options + index;
3620 if (match_option(option, "-XX:", &tail)) {
3621 logOption(tail);
3622 }
3623 }
3624 }
3625
3626 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3627 jint result = parse_vm_init_args(args);
3628 if (result != JNI_OK) {
3629 return result;
3630 }
3631
3632 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3633 SharedArchivePath = get_shared_archive_path();
3634 if (SharedArchivePath == NULL) {
3635 return JNI_ENOMEM;
3636 }
3637
3638 // Delay warning until here so that we've had a chance to process
3639 // the -XX:-PrintWarnings flag
3640 if (needs_hotspotrc_warning) {
3641 warning("%s file is present but has been ignored. "
3642 "Run with -XX:Flags=%s to load the file.",
3643 hotspotrc, hotspotrc);
3644 }
3645
3646 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3647 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3648 #endif
3649
3650 #if INCLUDE_ALL_GCS
3651 #if (defined JAVASE_EMBEDDED || defined ARM)
3652 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3653 #endif
3654 #endif
3655
3656 #ifndef PRODUCT
3657 if (TraceBytecodesAt != 0) {
3658 TraceBytecodes = true;
3659 }
3660 if (CountCompiledCalls) {
3661 if (UseCounterDecay) {
3662 warning("UseCounterDecay disabled because CountCalls is set");
3663 UseCounterDecay = false;
3664 }
3665 }
3666 #endif // PRODUCT
3667
3668 // JSR 292 is not supported before 1.7
3669 if (!JDK_Version::is_gte_jdk17x_version()) {
3670 if (EnableInvokeDynamic) {
3671 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3672 warning("JSR 292 is not supported before 1.7. Disabling support.");
3673 }
3674 EnableInvokeDynamic = false;
3675 }
3676 }
3677
3678 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3679 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3680 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3681 }
3682 ScavengeRootsInCode = 1;
3683 }
3684
3685 if (PrintGCDetails) {
3686 // Turn on -verbose:gc options as well
3687 PrintGC = true;
3688 }
3689
3690 if (!JDK_Version::is_gte_jdk18x_version()) {
3691 // To avoid changing the log format for 7 updates this flag is only
3692 // true by default in JDK8 and above.
3693 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3694 FLAG_SET_DEFAULT(PrintGCCause, false);
3695 }
3696 }
3697
3698 // Set object alignment values.
3699 set_object_alignment();
3700
3701 #if !INCLUDE_ALL_GCS
3702 force_serial_gc();
3703 #endif // INCLUDE_ALL_GCS
3704 #if !INCLUDE_CDS
3705 if (DumpSharedSpaces || RequireSharedSpaces) {
3706 jio_fprintf(defaultStream::error_stream(),
3707 "Shared spaces are not supported in this VM\n");
3708 return JNI_ERR;
3709 }
3710 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3711 warning("Shared spaces are not supported in this VM");
3712 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3713 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3714 }
3715 no_shared_spaces();
3716 #endif // INCLUDE_CDS
3717
3718 return JNI_OK;
3719 }
3720
3721 jint Arguments::apply_ergo() {
3722
3723 // Set flags based on ergonomics.
3724 set_ergonomics_flags();
3725
3726 set_shared_spaces_flags();
3727
3728 // Check the GC selections again.
3729 if (!check_gc_consistency()) {
3730 return JNI_EINVAL;
3731 }
3732
3733 if (TieredCompilation) {
3734 set_tiered_flags();
3735 } else {
3736 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3737 if (CompilationPolicyChoice >= 2) {
3738 vm_exit_during_initialization(
3739 "Incompatible compilation policy selected", NULL);
3740 }
3741 }
3742 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3743 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3744 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3745 }
3746
3747
3748 // Set heap size based on available physical memory
3749 set_heap_size();
3750
3751 #if INCLUDE_ALL_GCS
3752 // Set per-collector flags
3753 if (UseParallelGC || UseParallelOldGC) {
3754 set_parallel_gc_flags();
3755 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
3756 set_cms_and_parnew_gc_flags();
3757 } else if (UseParNewGC) { // Skipped if CMS is set above
3758 set_parnew_gc_flags();
3759 } else if (UseG1GC) {
3760 set_g1_gc_flags();
3761 }
3762 check_deprecated_gcs();
3763 check_deprecated_gc_flags();
3764 if (AssumeMP && !UseSerialGC) {
3765 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3766 warning("If the number of processors is expected to increase from one, then"
3767 " you should configure the number of parallel GC threads appropriately"
3768 " using -XX:ParallelGCThreads=N");
3769 }
3770 }
3771 if (MinHeapFreeRatio == 100) {
3772 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
3773 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
3774 }
3775 #else // INCLUDE_ALL_GCS
3776 assert(verify_serial_gc_flags(), "SerialGC unset");
3777 #endif // INCLUDE_ALL_GCS
3778
3779 // Initialize Metaspace flags and alignments
3780 Metaspace::ergo_initialize();
3781
3782 // Set bytecode rewriting flags
3783 set_bytecode_flags();
3784
3785 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3786 set_aggressive_opts_flags();
3787
3788 // Turn off biased locking for locking debug mode flags,
3789 // which are subtly different from each other but neither works with
3790 // biased locking
3791 if (UseHeavyMonitors
3792 #ifdef COMPILER1
3793 || !UseFastLocking
3794 #endif // COMPILER1
3795 ) {
3796 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3797 // flag set to true on command line; warn the user that they
3798 // can't enable biased locking here
3799 warning("Biased Locking is not supported with locking debug flags"
3800 "; ignoring UseBiasedLocking flag." );
3801 }
3802 UseBiasedLocking = false;
3803 }
3804
3805 #ifdef ZERO
3806 // Clear flags not supported on zero.
3807 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3808 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3809 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3810 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3811 #endif // CC_INTERP
3812
3813 #ifdef COMPILER2
3814 if (!EliminateLocks) {
3815 EliminateNestedLocks = false;
3816 }
3817 if (!Inline) {
3818 IncrementalInline = false;
3819 }
3820 #ifndef PRODUCT
3821 if (!IncrementalInline) {
3822 AlwaysIncrementalInline = false;
3823 }
3824 #endif
3825 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3826 // incremental inlining: bump MaxNodeLimit
3827 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3828 }
3829 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3830 // nothing to use the profiling, turn if off
3831 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3832 }
3833 if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) {
3834 // Doing the replace in parent maps helps speculation
3835 FLAG_SET_DEFAULT(ReplaceInParentMaps, true);
3836 }
3837 #endif
3838
3839 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3840 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3841 DebugNonSafepoints = true;
3842 }
3843
3844 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3845 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3846 }
3847
3848 #ifndef PRODUCT
3849 if (CompileTheWorld) {
3850 // Force NmethodSweeper to sweep whole CodeCache each time.
3851 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3852 NmethodSweepFraction = 1;
3853 }
3854 }
3855
3856 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3857 if (use_vm_log()) {
3858 LogVMOutput = true;
3859 }
3860 }
3861 #endif // PRODUCT
3862
3863 if (PrintCommandLineFlags) {
3864 CommandLineFlags::printSetFlags(tty);
3865 }
3866
3867 // Apply CPU specific policy for the BiasedLocking
3868 if (UseBiasedLocking) {
3869 if (!VM_Version::use_biased_locking() &&
3870 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3871 UseBiasedLocking = false;
3872 }
3873 }
3874 #ifdef COMPILER2
3875 if (!UseBiasedLocking || EmitSync != 0) {
3876 UseOptoBiasInlining = false;
3877 }
3878 #endif
3879
3880 return JNI_OK;
3881 }
3882
3883 jint Arguments::adjust_after_os() {
3884 if (UseNUMA) {
3885 if (UseParallelGC || UseParallelOldGC) {
3886 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3887 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3888 }
3889 }
3890 // UseNUMAInterleaving is set to ON for all collectors and
3891 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3892 // such as the parallel collector for Linux and Solaris will
3893 // interleave old gen and survivor spaces on top of NUMA
3894 // allocation policy for the eden space.
3895 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3896 // all platforms and ParallelGC on Windows will interleave all
3897 // of the heap spaces across NUMA nodes.
3898 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3899 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3900 }
3901 }
3902 return JNI_OK;
3903 }
3904
3905 int Arguments::PropertyList_count(SystemProperty* pl) {
3906 int count = 0;
3907 while(pl != NULL) {
3908 count++;
3909 pl = pl->next();
3910 }
3911 return count;
3912 }
3913
3914 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3915 assert(key != NULL, "just checking");
3916 SystemProperty* prop;
3917 for (prop = pl; prop != NULL; prop = prop->next()) {
3918 if (strcmp(key, prop->key()) == 0) return prop->value();
3919 }
3920 return NULL;
3921 }
3922
3923 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3924 int count = 0;
3925 const char* ret_val = NULL;
3926
3927 while(pl != NULL) {
3928 if(count >= index) {
3929 ret_val = pl->key();
3930 break;
3931 }
3932 count++;
3933 pl = pl->next();
3934 }
3935
3936 return ret_val;
3937 }
3938
3939 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3940 int count = 0;
3941 char* ret_val = NULL;
3942
3943 while(pl != NULL) {
3944 if(count >= index) {
3945 ret_val = pl->value();
3946 break;
3947 }
3948 count++;
3949 pl = pl->next();
3950 }
3951
3952 return ret_val;
3953 }
3954
3955 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3956 SystemProperty* p = *plist;
3957 if (p == NULL) {
3958 *plist = new_p;
3959 } else {
3960 while (p->next() != NULL) {
3961 p = p->next();
3962 }
3963 p->set_next(new_p);
3964 }
3965 }
3966
3967 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3968 if (plist == NULL)
3969 return;
3970
3971 SystemProperty* new_p = new SystemProperty(k, v, true);
3972 PropertyList_add(plist, new_p);
3973 }
3974
3975 // This add maintains unique property key in the list.
3976 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3977 if (plist == NULL)
3978 return;
3979
3980 // If property key exist then update with new value.
3981 SystemProperty* prop;
3982 for (prop = *plist; prop != NULL; prop = prop->next()) {
3983 if (strcmp(k, prop->key()) == 0) {
3984 if (append) {
3985 prop->append_value(v);
3986 } else {
3987 prop->set_value(v);
3988 }
3989 return;
3990 }
3991 }
3992
3993 PropertyList_add(plist, k, v);
3994 }
3995
3996 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3997 // Returns true if all of the source pointed by src has been copied over to
3998 // the destination buffer pointed by buf. Otherwise, returns false.
3999 // Notes:
4000 // 1. If the length (buflen) of the destination buffer excluding the
4001 // NULL terminator character is not long enough for holding the expanded
4002 // pid characters, it also returns false instead of returning the partially
4003 // expanded one.
4004 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4005 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4006 char* buf, size_t buflen) {
4007 const char* p = src;
4008 char* b = buf;
4009 const char* src_end = &src[srclen];
4010 char* buf_end = &buf[buflen - 1];
4011
4012 while (p < src_end && b < buf_end) {
4013 if (*p == '%') {
4014 switch (*(++p)) {
4015 case '%': // "%%" ==> "%"
4016 *b++ = *p++;
4017 break;
4018 case 'p': { // "%p" ==> current process id
4019 // buf_end points to the character before the last character so
4020 // that we could write '\0' to the end of the buffer.
4021 size_t buf_sz = buf_end - b + 1;
4022 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4023
4024 // if jio_snprintf fails or the buffer is not long enough to hold
4025 // the expanded pid, returns false.
4026 if (ret < 0 || ret >= (int)buf_sz) {
4027 return false;
4028 } else {
4029 b += ret;
4030 assert(*b == '\0', "fail in copy_expand_pid");
4031 if (p == src_end && b == buf_end + 1) {
4032 // reach the end of the buffer.
4033 return true;
4034 }
4035 }
4036 p++;
4037 break;
4038 }
4039 default :
4040 *b++ = '%';
4041 }
4042 } else {
4043 *b++ = *p++;
4044 }
4045 }
4046 *b = '\0';
4047 return (p == src_end); // return false if not all of the source was copied
4048 }