1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "compiler/compilerOracle.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/cardTableRS.hpp"
31 #include "memory/genCollectedHeap.hpp"
32 #include "memory/referenceProcessor.hpp"
33 #include "memory/universe.inline.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "prims/jvmtiExport.hpp"
36 #include "runtime/arguments.hpp"
37 #include "runtime/globals_extension.hpp"
38 #include "runtime/java.hpp"
39 #include "services/management.hpp"
40 #include "services/memTracker.hpp"
41 #include "utilities/defaultStream.hpp"
42 #include "utilities/macros.hpp"
43 #include "utilities/taskqueue.hpp"
44 #ifdef TARGET_OS_FAMILY_linux
45 # include "os_linux.inline.hpp"
46 #endif
47 #ifdef TARGET_OS_FAMILY_solaris
48 # include "os_solaris.inline.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_windows
51 # include "os_windows.inline.hpp"
52 #endif
53 #ifdef TARGET_OS_FAMILY_aix
54 # include "os_aix.inline.hpp"
55 #endif
56 #ifdef TARGET_OS_FAMILY_bsd
57 # include "os_bsd.inline.hpp"
58 #endif
59 #if INCLUDE_ALL_GCS
60 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
61 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
62 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
63 #endif // INCLUDE_ALL_GCS
64
65 // Note: This is a special bug reporting site for the JVM
66 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
67 #define DEFAULT_JAVA_LAUNCHER "generic"
68
69 // Disable options not supported in this release, with a warning if they
70 // were explicitly requested on the command-line
71 #define UNSUPPORTED_OPTION(opt, description) \
72 do { \
73 if (opt) { \
74 if (FLAG_IS_CMDLINE(opt)) { \
75 warning(description " is disabled in this release."); \
76 } \
77 FLAG_SET_DEFAULT(opt, false); \
78 } \
79 } while(0)
80
81 #define UNSUPPORTED_GC_OPTION(gc) \
82 do { \
83 if (gc) { \
84 if (FLAG_IS_CMDLINE(gc)) { \
85 warning(#gc " is not supported in this VM. Using Serial GC."); \
86 } \
87 FLAG_SET_DEFAULT(gc, false); \
88 } \
89 } while(0)
90
91 char** Arguments::_jvm_flags_array = NULL;
92 int Arguments::_num_jvm_flags = 0;
93 char** Arguments::_jvm_args_array = NULL;
94 int Arguments::_num_jvm_args = 0;
95 char* Arguments::_java_command = NULL;
96 SystemProperty* Arguments::_system_properties = NULL;
97 const char* Arguments::_gc_log_filename = NULL;
98 bool Arguments::_has_profile = false;
99 size_t Arguments::_conservative_max_heap_alignment = 0;
100 uintx Arguments::_min_heap_size = 0;
101 Arguments::Mode Arguments::_mode = _mixed;
102 bool Arguments::_java_compiler = false;
103 bool Arguments::_xdebug_mode = false;
104 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
105 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
106 int Arguments::_sun_java_launcher_pid = -1;
107 bool Arguments::_sun_java_launcher_is_altjvm = false;
108
109 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
110 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
111 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
112 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
113 bool Arguments::_ClipInlining = ClipInlining;
114
115 char* Arguments::SharedArchivePath = NULL;
116
117 AgentLibraryList Arguments::_libraryList;
118 AgentLibraryList Arguments::_agentList;
119
120 abort_hook_t Arguments::_abort_hook = NULL;
121 exit_hook_t Arguments::_exit_hook = NULL;
122 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
123
124
125 SystemProperty *Arguments::_java_ext_dirs = NULL;
126 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
127 SystemProperty *Arguments::_sun_boot_library_path = NULL;
128 SystemProperty *Arguments::_java_library_path = NULL;
129 SystemProperty *Arguments::_java_home = NULL;
130 SystemProperty *Arguments::_java_class_path = NULL;
131 SystemProperty *Arguments::_sun_boot_class_path = NULL;
132
133 char* Arguments::_meta_index_path = NULL;
134 char* Arguments::_meta_index_dir = NULL;
135
136 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
137
138 static bool match_option(const JavaVMOption *option, const char* name,
139 const char** tail) {
140 int len = (int)strlen(name);
141 if (strncmp(option->optionString, name, len) == 0) {
142 *tail = option->optionString + len;
143 return true;
144 } else {
145 return false;
146 }
147 }
148
149 static void logOption(const char* opt) {
150 if (PrintVMOptions) {
151 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
152 }
153 }
154
155 // Process java launcher properties.
156 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
157 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
158 // sun.java.launcher.pid is defined.
159 // Must do this before setting up other system properties,
160 // as some of them may depend on launcher type.
161 for (int index = 0; index < args->nOptions; index++) {
162 const JavaVMOption* option = args->options + index;
163 const char* tail;
164
165 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
166 process_java_launcher_argument(tail, option->extraInfo);
167 continue;
168 }
169 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
170 if (strcmp(tail, "true") == 0) {
171 _sun_java_launcher_is_altjvm = true;
172 }
173 continue;
174 }
175 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
176 _sun_java_launcher_pid = atoi(tail);
177 continue;
178 }
179 }
180 }
181
182 // Initialize system properties key and value.
183 void Arguments::init_system_properties() {
184
185 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
186 "Java Virtual Machine Specification", false));
187 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
188 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
190
191 // Following are JVMTI agent writable properties.
192 // Properties values are set to NULL and they are
193 // os specific they are initialized in os::init_system_properties_values().
194 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
195 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
196 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
197 _java_library_path = new SystemProperty("java.library.path", NULL, true);
198 _java_home = new SystemProperty("java.home", NULL, true);
199 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
200
201 _java_class_path = new SystemProperty("java.class.path", "", true);
202
203 // Add to System Property list.
204 PropertyList_add(&_system_properties, _java_ext_dirs);
205 PropertyList_add(&_system_properties, _java_endorsed_dirs);
206 PropertyList_add(&_system_properties, _sun_boot_library_path);
207 PropertyList_add(&_system_properties, _java_library_path);
208 PropertyList_add(&_system_properties, _java_home);
209 PropertyList_add(&_system_properties, _java_class_path);
210 PropertyList_add(&_system_properties, _sun_boot_class_path);
211
212 // Set OS specific system properties values
213 os::init_system_properties_values();
214 }
215
216
217 // Update/Initialize System properties after JDK version number is known
218 void Arguments::init_version_specific_system_properties() {
219 enum { bufsz = 16 };
220 char buffer[bufsz];
221 const char* spec_vendor = "Sun Microsystems Inc.";
222 uint32_t spec_version = 0;
223
224 if (JDK_Version::is_gte_jdk17x_version()) {
225 spec_vendor = "Oracle Corporation";
226 spec_version = JDK_Version::current().major_version();
227 }
228 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
229
230 PropertyList_add(&_system_properties,
231 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.specification.version", buffer, false));
234 PropertyList_add(&_system_properties,
235 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
236 }
237
238 /**
239 * Provide a slightly more user-friendly way of eliminating -XX flags.
240 * When a flag is eliminated, it can be added to this list in order to
241 * continue accepting this flag on the command-line, while issuing a warning
242 * and ignoring the value. Once the JDK version reaches the 'accept_until'
243 * limit, we flatly refuse to admit the existence of the flag. This allows
244 * a flag to die correctly over JDK releases using HSX.
245 */
246 typedef struct {
247 const char* name;
248 JDK_Version obsoleted_in; // when the flag went away
249 JDK_Version accept_until; // which version to start denying the existence
250 } ObsoleteFlag;
251
252 static ObsoleteFlag obsolete_jvm_flags[] = {
253 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
258 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
259 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
260 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
261 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
262 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
263 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
264 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
265 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
266 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
267 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
268 { "DefaultInitialRAMFraction",
269 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
270 { "UseDepthFirstScavengeOrder",
271 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
272 { "HandlePromotionFailure",
273 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
274 { "MaxLiveObjectEvacuationRatio",
275 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
276 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
277 { "UseParallelOldGCCompacting",
278 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
279 { "UseParallelDensePrefixUpdate",
280 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
281 { "UseParallelOldGCDensePrefix",
282 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
283 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
284 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
285 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
295 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
296 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
297 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
298 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
299 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
300 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
302 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
303 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
304 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
305 #ifdef PRODUCT
306 { "DesiredMethodLimit",
307 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
308 #endif // PRODUCT
309 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) },
310 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
311 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
312 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
313 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
314 { NULL, JDK_Version(0), JDK_Version(0) }
315 };
316
317 // Returns true if the flag is obsolete and fits into the range specified
318 // for being ignored. In the case that the flag is ignored, the 'version'
319 // value is filled in with the version number when the flag became
320 // obsolete so that that value can be displayed to the user.
321 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
322 int i = 0;
323 assert(version != NULL, "Must provide a version buffer");
324 while (obsolete_jvm_flags[i].name != NULL) {
325 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
326 // <flag>=xxx form
327 // [-|+]<flag> form
328 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
329 ((s[0] == '+' || s[0] == '-') &&
330 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
331 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
332 *version = flag_status.obsoleted_in;
333 return true;
334 }
335 }
336 i++;
337 }
338 return false;
339 }
340
341 // Constructs the system class path (aka boot class path) from the following
342 // components, in order:
343 //
344 // prefix // from -Xbootclasspath/p:...
345 // endorsed // the expansion of -Djava.endorsed.dirs=...
346 // base // from os::get_system_properties() or -Xbootclasspath=
347 // suffix // from -Xbootclasspath/a:...
348 //
349 // java.endorsed.dirs is a list of directories; any jar or zip files in the
350 // directories are added to the sysclasspath just before the base.
351 //
352 // This could be AllStatic, but it isn't needed after argument processing is
353 // complete.
354 class SysClassPath: public StackObj {
355 public:
356 SysClassPath(const char* base);
357 ~SysClassPath();
358
359 inline void set_base(const char* base);
360 inline void add_prefix(const char* prefix);
361 inline void add_suffix_to_prefix(const char* suffix);
362 inline void add_suffix(const char* suffix);
363 inline void reset_path(const char* base);
364
365 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
366 // property. Must be called after all command-line arguments have been
367 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
368 // combined_path().
369 void expand_endorsed();
370
371 inline const char* get_base() const { return _items[_scp_base]; }
372 inline const char* get_prefix() const { return _items[_scp_prefix]; }
373 inline const char* get_suffix() const { return _items[_scp_suffix]; }
374 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
375
376 // Combine all the components into a single c-heap-allocated string; caller
377 // must free the string if/when no longer needed.
378 char* combined_path();
379
380 private:
381 // Utility routines.
382 static char* add_to_path(const char* path, const char* str, bool prepend);
383 static char* add_jars_to_path(char* path, const char* directory);
384
385 inline void reset_item_at(int index);
386
387 // Array indices for the items that make up the sysclasspath. All except the
388 // base are allocated in the C heap and freed by this class.
389 enum {
390 _scp_prefix, // from -Xbootclasspath/p:...
391 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
392 _scp_base, // the default sysclasspath
393 _scp_suffix, // from -Xbootclasspath/a:...
394 _scp_nitems // the number of items, must be last.
395 };
396
397 const char* _items[_scp_nitems];
398 DEBUG_ONLY(bool _expansion_done;)
399 };
400
401 SysClassPath::SysClassPath(const char* base) {
402 memset(_items, 0, sizeof(_items));
403 _items[_scp_base] = base;
404 DEBUG_ONLY(_expansion_done = false;)
405 }
406
407 SysClassPath::~SysClassPath() {
408 // Free everything except the base.
409 for (int i = 0; i < _scp_nitems; ++i) {
410 if (i != _scp_base) reset_item_at(i);
411 }
412 DEBUG_ONLY(_expansion_done = false;)
413 }
414
415 inline void SysClassPath::set_base(const char* base) {
416 _items[_scp_base] = base;
417 }
418
419 inline void SysClassPath::add_prefix(const char* prefix) {
420 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
421 }
422
423 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
424 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
425 }
426
427 inline void SysClassPath::add_suffix(const char* suffix) {
428 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
429 }
430
431 inline void SysClassPath::reset_item_at(int index) {
432 assert(index < _scp_nitems && index != _scp_base, "just checking");
433 if (_items[index] != NULL) {
434 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
435 _items[index] = NULL;
436 }
437 }
438
439 inline void SysClassPath::reset_path(const char* base) {
440 // Clear the prefix and suffix.
441 reset_item_at(_scp_prefix);
442 reset_item_at(_scp_suffix);
443 set_base(base);
444 }
445
446 //------------------------------------------------------------------------------
447
448 void SysClassPath::expand_endorsed() {
449 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
450
451 const char* path = Arguments::get_property("java.endorsed.dirs");
452 if (path == NULL) {
453 path = Arguments::get_endorsed_dir();
454 assert(path != NULL, "no default for java.endorsed.dirs");
455 }
456
457 char* expanded_path = NULL;
458 const char separator = *os::path_separator();
459 const char* const end = path + strlen(path);
460 while (path < end) {
461 const char* tmp_end = strchr(path, separator);
462 if (tmp_end == NULL) {
463 expanded_path = add_jars_to_path(expanded_path, path);
464 path = end;
465 } else {
466 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
467 memcpy(dirpath, path, tmp_end - path);
468 dirpath[tmp_end - path] = '\0';
469 expanded_path = add_jars_to_path(expanded_path, dirpath);
470 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
471 path = tmp_end + 1;
472 }
473 }
474 _items[_scp_endorsed] = expanded_path;
475 DEBUG_ONLY(_expansion_done = true;)
476 }
477
478 // Combine the bootclasspath elements, some of which may be null, into a single
479 // c-heap-allocated string.
480 char* SysClassPath::combined_path() {
481 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
482 assert(_expansion_done, "must call expand_endorsed() first.");
483
484 size_t lengths[_scp_nitems];
485 size_t total_len = 0;
486
487 const char separator = *os::path_separator();
488
489 // Get the lengths.
490 int i;
491 for (i = 0; i < _scp_nitems; ++i) {
492 if (_items[i] != NULL) {
493 lengths[i] = strlen(_items[i]);
494 // Include space for the separator char (or a NULL for the last item).
495 total_len += lengths[i] + 1;
496 }
497 }
498 assert(total_len > 0, "empty sysclasspath not allowed");
499
500 // Copy the _items to a single string.
501 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
502 char* cp_tmp = cp;
503 for (i = 0; i < _scp_nitems; ++i) {
504 if (_items[i] != NULL) {
505 memcpy(cp_tmp, _items[i], lengths[i]);
506 cp_tmp += lengths[i];
507 *cp_tmp++ = separator;
508 }
509 }
510 *--cp_tmp = '\0'; // Replace the extra separator.
511 return cp;
512 }
513
514 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
515 char*
516 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
517 char *cp;
518
519 assert(str != NULL, "just checking");
520 if (path == NULL) {
521 size_t len = strlen(str) + 1;
522 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
523 memcpy(cp, str, len); // copy the trailing null
524 } else {
525 const char separator = *os::path_separator();
526 size_t old_len = strlen(path);
527 size_t str_len = strlen(str);
528 size_t len = old_len + str_len + 2;
529
530 if (prepend) {
531 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
532 char* cp_tmp = cp;
533 memcpy(cp_tmp, str, str_len);
534 cp_tmp += str_len;
535 *cp_tmp = separator;
536 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
537 FREE_C_HEAP_ARRAY(char, path, mtInternal);
538 } else {
539 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
540 char* cp_tmp = cp + old_len;
541 *cp_tmp = separator;
542 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
543 }
544 }
545 return cp;
546 }
547
548 // Scan the directory and append any jar or zip files found to path.
549 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
550 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
551 DIR* dir = os::opendir(directory);
552 if (dir == NULL) return path;
553
554 char dir_sep[2] = { '\0', '\0' };
555 size_t directory_len = strlen(directory);
556 const char fileSep = *os::file_separator();
557 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
558
559 /* Scan the directory for jars/zips, appending them to path. */
560 struct dirent *entry;
561 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
562 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
563 const char* name = entry->d_name;
564 const char* ext = name + strlen(name) - 4;
565 bool isJarOrZip = ext > name &&
566 (os::file_name_strcmp(ext, ".jar") == 0 ||
567 os::file_name_strcmp(ext, ".zip") == 0);
568 if (isJarOrZip) {
569 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
570 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
571 path = add_to_path(path, jarpath, false);
572 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
573 }
574 }
575 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
576 os::closedir(dir);
577 return path;
578 }
579
580 // Parses a memory size specification string.
581 static bool atomull(const char *s, julong* result) {
582 julong n = 0;
583 int args_read = sscanf(s, JULONG_FORMAT, &n);
584 if (args_read != 1) {
585 return false;
586 }
587 while (*s != '\0' && isdigit(*s)) {
588 s++;
589 }
590 // 4705540: illegal if more characters are found after the first non-digit
591 if (strlen(s) > 1) {
592 return false;
593 }
594 switch (*s) {
595 case 'T': case 't':
596 *result = n * G * K;
597 // Check for overflow.
598 if (*result/((julong)G * K) != n) return false;
599 return true;
600 case 'G': case 'g':
601 *result = n * G;
602 if (*result/G != n) return false;
603 return true;
604 case 'M': case 'm':
605 *result = n * M;
606 if (*result/M != n) return false;
607 return true;
608 case 'K': case 'k':
609 *result = n * K;
610 if (*result/K != n) return false;
611 return true;
612 case '\0':
613 *result = n;
614 return true;
615 default:
616 return false;
617 }
618 }
619
620 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
621 if (size < min_size) return arg_too_small;
622 // Check that size will fit in a size_t (only relevant on 32-bit)
623 if (size > max_uintx) return arg_too_big;
624 return arg_in_range;
625 }
626
627 // Describe an argument out of range error
628 void Arguments::describe_range_error(ArgsRange errcode) {
629 switch(errcode) {
630 case arg_too_big:
631 jio_fprintf(defaultStream::error_stream(),
632 "The specified size exceeds the maximum "
633 "representable size.\n");
634 break;
635 case arg_too_small:
636 case arg_unreadable:
637 case arg_in_range:
638 // do nothing for now
639 break;
640 default:
641 ShouldNotReachHere();
642 }
643 }
644
645 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
646 return CommandLineFlags::boolAtPut(name, &value, origin);
647 }
648
649 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
650 double v;
651 if (sscanf(value, "%lf", &v) != 1) {
652 return false;
653 }
654
655 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
656 return true;
657 }
658 return false;
659 }
660
661 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
662 julong v;
663 intx intx_v;
664 bool is_neg = false;
665 // Check the sign first since atomull() parses only unsigned values.
666 if (*value == '-') {
667 if (!CommandLineFlags::intxAt(name, &intx_v)) {
668 return false;
669 }
670 value++;
671 is_neg = true;
672 }
673 if (!atomull(value, &v)) {
674 return false;
675 }
676 intx_v = (intx) v;
677 if (is_neg) {
678 intx_v = -intx_v;
679 }
680 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
681 return true;
682 }
683 uintx uintx_v = (uintx) v;
684 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
685 return true;
686 }
687 uint64_t uint64_t_v = (uint64_t) v;
688 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
689 return true;
690 }
691 return false;
692 }
693
694 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
695 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
696 // Contract: CommandLineFlags always returns a pointer that needs freeing.
697 FREE_C_HEAP_ARRAY(char, value, mtInternal);
698 return true;
699 }
700
701 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
702 const char* old_value = "";
703 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
704 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
705 size_t new_len = strlen(new_value);
706 const char* value;
707 char* free_this_too = NULL;
708 if (old_len == 0) {
709 value = new_value;
710 } else if (new_len == 0) {
711 value = old_value;
712 } else {
713 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
714 // each new setting adds another LINE to the switch:
715 sprintf(buf, "%s\n%s", old_value, new_value);
716 value = buf;
717 free_this_too = buf;
718 }
719 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
720 // CommandLineFlags always returns a pointer that needs freeing.
721 FREE_C_HEAP_ARRAY(char, value, mtInternal);
722 if (free_this_too != NULL) {
723 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
724 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
725 }
726 return true;
727 }
728
729 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
730
731 // range of acceptable characters spelled out for portability reasons
732 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
733 #define BUFLEN 255
734 char name[BUFLEN+1];
735 char dummy;
736
737 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
738 return set_bool_flag(name, false, origin);
739 }
740 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
741 return set_bool_flag(name, true, origin);
742 }
743
744 char punct;
745 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
746 const char* value = strchr(arg, '=') + 1;
747 Flag* flag = Flag::find_flag(name, strlen(name));
748 if (flag != NULL && flag->is_ccstr()) {
749 if (flag->ccstr_accumulates()) {
750 return append_to_string_flag(name, value, origin);
751 } else {
752 if (value[0] == '\0') {
753 value = NULL;
754 }
755 return set_string_flag(name, value, origin);
756 }
757 }
758 }
759
760 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
761 const char* value = strchr(arg, '=') + 1;
762 // -XX:Foo:=xxx will reset the string flag to the given value.
763 if (value[0] == '\0') {
764 value = NULL;
765 }
766 return set_string_flag(name, value, origin);
767 }
768
769 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
770 #define SIGNED_NUMBER_RANGE "[-0123456789]"
771 #define NUMBER_RANGE "[0123456789]"
772 char value[BUFLEN + 1];
773 char value2[BUFLEN + 1];
774 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
775 // Looks like a floating-point number -- try again with more lenient format string
776 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
777 return set_fp_numeric_flag(name, value, origin);
778 }
779 }
780
781 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
782 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
783 return set_numeric_flag(name, value, origin);
784 }
785
786 return false;
787 }
788
789 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
790 assert(bldarray != NULL, "illegal argument");
791
792 if (arg == NULL) {
793 return;
794 }
795
796 int new_count = *count + 1;
797
798 // expand the array and add arg to the last element
799 if (*bldarray == NULL) {
800 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
801 } else {
802 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
803 }
804 (*bldarray)[*count] = strdup(arg);
805 *count = new_count;
806 }
807
808 void Arguments::build_jvm_args(const char* arg) {
809 add_string(&_jvm_args_array, &_num_jvm_args, arg);
810 }
811
812 void Arguments::build_jvm_flags(const char* arg) {
813 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
814 }
815
816 // utility function to return a string that concatenates all
817 // strings in a given char** array
818 const char* Arguments::build_resource_string(char** args, int count) {
819 if (args == NULL || count == 0) {
820 return NULL;
821 }
822 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
823 for (int i = 1; i < count; i++) {
824 length += strlen(args[i]) + 1; // add 1 for a space
825 }
826 char* s = NEW_RESOURCE_ARRAY(char, length);
827 strcpy(s, args[0]);
828 for (int j = 1; j < count; j++) {
829 strcat(s, " ");
830 strcat(s, args[j]);
831 }
832 return (const char*) s;
833 }
834
835 void Arguments::print_on(outputStream* st) {
836 st->print_cr("VM Arguments:");
837 if (num_jvm_flags() > 0) {
838 st->print("jvm_flags: "); print_jvm_flags_on(st);
839 }
840 if (num_jvm_args() > 0) {
841 st->print("jvm_args: "); print_jvm_args_on(st);
842 }
843 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
844 if (_java_class_path != NULL) {
845 char* path = _java_class_path->value();
846 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
847 }
848 st->print_cr("Launcher Type: %s", _sun_java_launcher);
849 }
850
851 void Arguments::print_jvm_flags_on(outputStream* st) {
852 if (_num_jvm_flags > 0) {
853 for (int i=0; i < _num_jvm_flags; i++) {
854 st->print("%s ", _jvm_flags_array[i]);
855 }
856 st->print_cr("");
857 }
858 }
859
860 void Arguments::print_jvm_args_on(outputStream* st) {
861 if (_num_jvm_args > 0) {
862 for (int i=0; i < _num_jvm_args; i++) {
863 st->print("%s ", _jvm_args_array[i]);
864 }
865 st->print_cr("");
866 }
867 }
868
869 bool Arguments::process_argument(const char* arg,
870 jboolean ignore_unrecognized, Flag::Flags origin) {
871
872 JDK_Version since = JDK_Version();
873
874 if (parse_argument(arg, origin) || ignore_unrecognized) {
875 return true;
876 }
877
878 bool has_plus_minus = (*arg == '+' || *arg == '-');
879 const char* const argname = has_plus_minus ? arg + 1 : arg;
880 if (is_newly_obsolete(arg, &since)) {
881 char version[256];
882 since.to_string(version, sizeof(version));
883 warning("ignoring option %s; support was removed in %s", argname, version);
884 return true;
885 }
886
887 // For locked flags, report a custom error message if available.
888 // Otherwise, report the standard unrecognized VM option.
889
890 size_t arg_len;
891 const char* equal_sign = strchr(argname, '=');
892 if (equal_sign == NULL) {
893 arg_len = strlen(argname);
894 } else {
895 arg_len = equal_sign - argname;
896 }
897
898 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
899 if (found_flag != NULL) {
900 char locked_message_buf[BUFLEN];
901 found_flag->get_locked_message(locked_message_buf, BUFLEN);
902 if (strlen(locked_message_buf) == 0) {
903 if (found_flag->is_bool() && !has_plus_minus) {
904 jio_fprintf(defaultStream::error_stream(),
905 "Missing +/- setting for VM option '%s'\n", argname);
906 } else if (!found_flag->is_bool() && has_plus_minus) {
907 jio_fprintf(defaultStream::error_stream(),
908 "Unexpected +/- setting in VM option '%s'\n", argname);
909 } else {
910 jio_fprintf(defaultStream::error_stream(),
911 "Improperly specified VM option '%s'\n", argname);
912 }
913 } else {
914 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
915 }
916 } else {
917 jio_fprintf(defaultStream::error_stream(),
918 "Unrecognized VM option '%s'\n", argname);
919 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
920 if (fuzzy_matched != NULL) {
921 jio_fprintf(defaultStream::error_stream(),
922 "Did you mean '%s%s%s'?\n",
923 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
924 fuzzy_matched->_name,
925 (fuzzy_matched->is_bool()) ? "" : "=<value>");
926 }
927 }
928
929 // allow for commandline "commenting out" options like -XX:#+Verbose
930 return arg[0] == '#';
931 }
932
933 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
934 FILE* stream = fopen(file_name, "rb");
935 if (stream == NULL) {
936 if (should_exist) {
937 jio_fprintf(defaultStream::error_stream(),
938 "Could not open settings file %s\n", file_name);
939 return false;
940 } else {
941 return true;
942 }
943 }
944
945 char token[1024];
946 int pos = 0;
947
948 bool in_white_space = true;
949 bool in_comment = false;
950 bool in_quote = false;
951 char quote_c = 0;
952 bool result = true;
953
954 int c = getc(stream);
955 while(c != EOF && pos < (int)(sizeof(token)-1)) {
956 if (in_white_space) {
957 if (in_comment) {
958 if (c == '\n') in_comment = false;
959 } else {
960 if (c == '#') in_comment = true;
961 else if (!isspace(c)) {
962 in_white_space = false;
963 token[pos++] = c;
964 }
965 }
966 } else {
967 if (c == '\n' || (!in_quote && isspace(c))) {
968 // token ends at newline, or at unquoted whitespace
969 // this allows a way to include spaces in string-valued options
970 token[pos] = '\0';
971 logOption(token);
972 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
973 build_jvm_flags(token);
974 pos = 0;
975 in_white_space = true;
976 in_quote = false;
977 } else if (!in_quote && (c == '\'' || c == '"')) {
978 in_quote = true;
979 quote_c = c;
980 } else if (in_quote && (c == quote_c)) {
981 in_quote = false;
982 } else {
983 token[pos++] = c;
984 }
985 }
986 c = getc(stream);
987 }
988 if (pos > 0) {
989 token[pos] = '\0';
990 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
991 build_jvm_flags(token);
992 }
993 fclose(stream);
994 return result;
995 }
996
997 //=============================================================================================================
998 // Parsing of properties (-D)
999
1000 const char* Arguments::get_property(const char* key) {
1001 return PropertyList_get_value(system_properties(), key);
1002 }
1003
1004 bool Arguments::add_property(const char* prop) {
1005 const char* eq = strchr(prop, '=');
1006 char* key;
1007 // ns must be static--its address may be stored in a SystemProperty object.
1008 const static char ns[1] = {0};
1009 char* value = (char *)ns;
1010
1011 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1012 key = AllocateHeap(key_len + 1, mtInternal);
1013 strncpy(key, prop, key_len);
1014 key[key_len] = '\0';
1015
1016 if (eq != NULL) {
1017 size_t value_len = strlen(prop) - key_len - 1;
1018 value = AllocateHeap(value_len + 1, mtInternal);
1019 strncpy(value, &prop[key_len + 1], value_len + 1);
1020 }
1021
1022 if (strcmp(key, "java.compiler") == 0) {
1023 process_java_compiler_argument(value);
1024 FreeHeap(key);
1025 if (eq != NULL) {
1026 FreeHeap(value);
1027 }
1028 return true;
1029 } else if (strcmp(key, "sun.java.command") == 0) {
1030 _java_command = value;
1031
1032 // Record value in Arguments, but let it get passed to Java.
1033 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1034 strcmp(key, "sun.java.launcher.pid") == 0) {
1035 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1036 // private and are processed in process_sun_java_launcher_properties();
1037 // the sun.java.launcher property is passed on to the java application
1038 FreeHeap(key);
1039 if (eq != NULL) {
1040 FreeHeap(value);
1041 }
1042 return true;
1043 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1044 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1045 // its value without going through the property list or making a Java call.
1046 _java_vendor_url_bug = value;
1047 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1048 PropertyList_unique_add(&_system_properties, key, value, true);
1049 return true;
1050 }
1051 // Create new property and add at the end of the list
1052 PropertyList_unique_add(&_system_properties, key, value);
1053 return true;
1054 }
1055
1056 //===========================================================================================================
1057 // Setting int/mixed/comp mode flags
1058
1059 void Arguments::set_mode_flags(Mode mode) {
1060 // Set up default values for all flags.
1061 // If you add a flag to any of the branches below,
1062 // add a default value for it here.
1063 set_java_compiler(false);
1064 _mode = mode;
1065
1066 // Ensure Agent_OnLoad has the correct initial values.
1067 // This may not be the final mode; mode may change later in onload phase.
1068 PropertyList_unique_add(&_system_properties, "java.vm.info",
1069 (char*)VM_Version::vm_info_string(), false);
1070
1071 UseInterpreter = true;
1072 UseCompiler = true;
1073 UseLoopCounter = true;
1074
1075 #ifndef ZERO
1076 // Turn these off for mixed and comp. Leave them on for Zero.
1077 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1078 UseFastAccessorMethods = (mode == _int);
1079 }
1080 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1081 UseFastEmptyMethods = (mode == _int);
1082 }
1083 #endif
1084
1085 // Default values may be platform/compiler dependent -
1086 // use the saved values
1087 ClipInlining = Arguments::_ClipInlining;
1088 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1089 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1090 BackgroundCompilation = Arguments::_BackgroundCompilation;
1091
1092 // Change from defaults based on mode
1093 switch (mode) {
1094 default:
1095 ShouldNotReachHere();
1096 break;
1097 case _int:
1098 UseCompiler = false;
1099 UseLoopCounter = false;
1100 AlwaysCompileLoopMethods = false;
1101 UseOnStackReplacement = false;
1102 break;
1103 case _mixed:
1104 // same as default
1105 break;
1106 case _comp:
1107 UseInterpreter = false;
1108 BackgroundCompilation = false;
1109 ClipInlining = false;
1110 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1111 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1112 // compile a level 4 (C2) and then continue executing it.
1113 if (TieredCompilation) {
1114 Tier3InvokeNotifyFreqLog = 0;
1115 Tier4InvocationThreshold = 0;
1116 }
1117 break;
1118 }
1119 }
1120
1121 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1122 // Conflict: required to use shared spaces (-Xshare:on), but
1123 // incompatible command line options were chosen.
1124
1125 static void no_shared_spaces() {
1126 if (RequireSharedSpaces) {
1127 jio_fprintf(defaultStream::error_stream(),
1128 "Class data sharing is inconsistent with other specified options.\n");
1129 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1130 } else {
1131 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1132 }
1133 }
1134 #endif
1135
1136 void Arguments::set_tiered_flags() {
1137 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1138 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1139 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1140 }
1141 if (CompilationPolicyChoice < 2) {
1142 vm_exit_during_initialization(
1143 "Incompatible compilation policy selected", NULL);
1144 }
1145 // Increase the code cache size - tiered compiles a lot more.
1146 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1147 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1148 }
1149 if (!UseInterpreter) { // -Xcomp
1150 Tier3InvokeNotifyFreqLog = 0;
1151 Tier4InvocationThreshold = 0;
1152 }
1153 }
1154
1155 /**
1156 * Returns the minimum number of compiler threads needed to run the JVM. The following
1157 * configurations are possible.
1158 *
1159 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1160 * compiler threads is 0.
1161 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1162 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1163 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1164 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1165 * C1 can be used, so the minimum number of compiler threads is 1.
1166 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1167 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1168 * the minimum number of compiler threads is 2.
1169 */
1170 int Arguments::get_min_number_of_compiler_threads() {
1171 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1172 return 0; // case 1
1173 #else
1174 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1175 return 1; // case 2 or case 3
1176 }
1177 return 2; // case 4 (tiered)
1178 #endif
1179 }
1180
1181 #if INCLUDE_ALL_GCS
1182 static void disable_adaptive_size_policy(const char* collector_name) {
1183 if (UseAdaptiveSizePolicy) {
1184 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1185 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1186 collector_name);
1187 }
1188 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1189 }
1190 }
1191
1192 void Arguments::set_parnew_gc_flags() {
1193 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1194 "control point invariant");
1195 assert(UseParNewGC, "Error");
1196
1197 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1198 disable_adaptive_size_policy("UseParNewGC");
1199
1200 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1201 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1202 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1203 } else if (ParallelGCThreads == 0) {
1204 jio_fprintf(defaultStream::error_stream(),
1205 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1206 vm_exit(1);
1207 }
1208
1209 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1210 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1211 // we set them to 1024 and 1024.
1212 // See CR 6362902.
1213 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1214 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1215 }
1216 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1217 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1218 }
1219
1220 // When using compressed oops, we use local overflow stacks,
1221 // rather than using a global overflow list chained through
1222 // the klass word of the object's pre-image.
1223 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1224 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1225 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1226 }
1227 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1228 }
1229 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1230 }
1231
1232 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1233 // sparc/solaris for certain applications, but would gain from
1234 // further optimization and tuning efforts, and would almost
1235 // certainly gain from analysis of platform and environment.
1236 void Arguments::set_cms_and_parnew_gc_flags() {
1237 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1238 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1239
1240 // If we are using CMS, we prefer to UseParNewGC,
1241 // unless explicitly forbidden.
1242 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1243 FLAG_SET_ERGO(bool, UseParNewGC, true);
1244 }
1245
1246 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1247 disable_adaptive_size_policy("UseConcMarkSweepGC");
1248
1249 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1250 // as needed.
1251 if (UseParNewGC) {
1252 set_parnew_gc_flags();
1253 }
1254
1255 size_t max_heap = align_size_down(MaxHeapSize,
1256 CardTableRS::ct_max_alignment_constraint());
1257
1258 // Now make adjustments for CMS
1259 intx tenuring_default = (intx)6;
1260 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1261
1262 // Preferred young gen size for "short" pauses:
1263 // upper bound depends on # of threads and NewRatio.
1264 const uintx parallel_gc_threads =
1265 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1266 const size_t preferred_max_new_size_unaligned =
1267 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1268 size_t preferred_max_new_size =
1269 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1270
1271 // Unless explicitly requested otherwise, size young gen
1272 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1273
1274 // If either MaxNewSize or NewRatio is set on the command line,
1275 // assume the user is trying to set the size of the young gen.
1276 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1277
1278 // Set MaxNewSize to our calculated preferred_max_new_size unless
1279 // NewSize was set on the command line and it is larger than
1280 // preferred_max_new_size.
1281 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1282 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1283 } else {
1284 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1285 }
1286 if (PrintGCDetails && Verbose) {
1287 // Too early to use gclog_or_tty
1288 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1289 }
1290
1291 // Code along this path potentially sets NewSize and OldSize
1292 if (PrintGCDetails && Verbose) {
1293 // Too early to use gclog_or_tty
1294 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1295 " initial_heap_size: " SIZE_FORMAT
1296 " max_heap: " SIZE_FORMAT,
1297 min_heap_size(), InitialHeapSize, max_heap);
1298 }
1299 size_t min_new = preferred_max_new_size;
1300 if (FLAG_IS_CMDLINE(NewSize)) {
1301 min_new = NewSize;
1302 }
1303 if (max_heap > min_new && min_heap_size() > min_new) {
1304 // Unless explicitly requested otherwise, make young gen
1305 // at least min_new, and at most preferred_max_new_size.
1306 if (FLAG_IS_DEFAULT(NewSize)) {
1307 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1308 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1309 if (PrintGCDetails && Verbose) {
1310 // Too early to use gclog_or_tty
1311 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1312 }
1313 }
1314 // Unless explicitly requested otherwise, size old gen
1315 // so it's NewRatio x of NewSize.
1316 if (FLAG_IS_DEFAULT(OldSize)) {
1317 if (max_heap > NewSize) {
1318 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1319 if (PrintGCDetails && Verbose) {
1320 // Too early to use gclog_or_tty
1321 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1322 }
1323 }
1324 }
1325 }
1326 }
1327 // Unless explicitly requested otherwise, definitely
1328 // promote all objects surviving "tenuring_default" scavenges.
1329 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1330 FLAG_IS_DEFAULT(SurvivorRatio)) {
1331 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1332 }
1333 // If we decided above (or user explicitly requested)
1334 // `promote all' (via MaxTenuringThreshold := 0),
1335 // prefer minuscule survivor spaces so as not to waste
1336 // space for (non-existent) survivors
1337 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1338 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1339 }
1340 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1341 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1342 // This is done in order to make ParNew+CMS configuration to work
1343 // with YoungPLABSize and OldPLABSize options.
1344 // See CR 6362902.
1345 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1346 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1347 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1348 // is. In this situation let CMSParPromoteBlocksToClaim follow
1349 // the value (either from the command line or ergonomics) of
1350 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1351 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1352 } else {
1353 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1354 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1355 // we'll let it to take precedence.
1356 jio_fprintf(defaultStream::error_stream(),
1357 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1358 " options are specified for the CMS collector."
1359 " CMSParPromoteBlocksToClaim will take precedence.\n");
1360 }
1361 }
1362 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1363 // OldPLAB sizing manually turned off: Use a larger default setting,
1364 // unless it was manually specified. This is because a too-low value
1365 // will slow down scavenges.
1366 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1367 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1368 }
1369 }
1370 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1371 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1372 // If either of the static initialization defaults have changed, note this
1373 // modification.
1374 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1375 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1376 }
1377 if (PrintGCDetails && Verbose) {
1378 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1379 MarkStackSize / K, MarkStackSizeMax / K);
1380 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1381 }
1382 }
1383 #endif // INCLUDE_ALL_GCS
1384
1385 void set_object_alignment() {
1386 // Object alignment.
1387 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1388 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1389 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1390 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1391 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1392 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1393
1394 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1395 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1396
1397 // Oop encoding heap max
1398 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1399
1400 #if INCLUDE_ALL_GCS
1401 // Set CMS global values
1402 CompactibleFreeListSpace::set_cms_values();
1403 #endif // INCLUDE_ALL_GCS
1404 }
1405
1406 bool verify_object_alignment() {
1407 // Object alignment.
1408 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1409 jio_fprintf(defaultStream::error_stream(),
1410 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1411 (int)ObjectAlignmentInBytes);
1412 return false;
1413 }
1414 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1415 jio_fprintf(defaultStream::error_stream(),
1416 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1417 (int)ObjectAlignmentInBytes, BytesPerLong);
1418 return false;
1419 }
1420 // It does not make sense to have big object alignment
1421 // since a space lost due to alignment will be greater
1422 // then a saved space from compressed oops.
1423 if ((int)ObjectAlignmentInBytes > 256) {
1424 jio_fprintf(defaultStream::error_stream(),
1425 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1426 (int)ObjectAlignmentInBytes);
1427 return false;
1428 }
1429 // In case page size is very small.
1430 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1431 jio_fprintf(defaultStream::error_stream(),
1432 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1433 (int)ObjectAlignmentInBytes, os::vm_page_size());
1434 return false;
1435 }
1436 return true;
1437 }
1438
1439 uintx Arguments::max_heap_for_compressed_oops() {
1440 // Avoid sign flip.
1441 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1442 // We need to fit both the NULL page and the heap into the memory budget, while
1443 // keeping alignment constraints of the heap. To guarantee the latter, as the
1444 // NULL page is located before the heap, we pad the NULL page to the conservative
1445 // maximum alignment that the GC may ever impose upon the heap.
1446 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1447 _conservative_max_heap_alignment);
1448
1449 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1450 NOT_LP64(ShouldNotReachHere(); return 0);
1451 }
1452
1453 bool Arguments::should_auto_select_low_pause_collector() {
1454 if (UseAutoGCSelectPolicy &&
1455 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1456 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1457 if (PrintGCDetails) {
1458 // Cannot use gclog_or_tty yet.
1459 tty->print_cr("Automatic selection of the low pause collector"
1460 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1461 }
1462 return true;
1463 }
1464 return false;
1465 }
1466
1467 void Arguments::set_use_compressed_oops() {
1468 #ifndef ZERO
1469 #ifdef _LP64
1470 // MaxHeapSize is not set up properly at this point, but
1471 // the only value that can override MaxHeapSize if we are
1472 // to use UseCompressedOops is InitialHeapSize.
1473 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1474
1475 if (max_heap_size <= max_heap_for_compressed_oops()) {
1476 #if !defined(COMPILER1) || defined(TIERED)
1477 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1478 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1479 }
1480 #endif
1481 #ifdef _WIN64
1482 if (UseLargePages && UseCompressedOops) {
1483 // Cannot allocate guard pages for implicit checks in indexed addressing
1484 // mode, when large pages are specified on windows.
1485 // This flag could be switched ON if narrow oop base address is set to 0,
1486 // see code in Universe::initialize_heap().
1487 Universe::set_narrow_oop_use_implicit_null_checks(false);
1488 }
1489 #endif // _WIN64
1490 } else {
1491 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1492 warning("Max heap size too large for Compressed Oops");
1493 FLAG_SET_DEFAULT(UseCompressedOops, false);
1494 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1495 }
1496 }
1497 #endif // _LP64
1498 #endif // ZERO
1499 }
1500
1501
1502 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1503 // set_use_compressed_oops().
1504 void Arguments::set_use_compressed_klass_ptrs() {
1505 #ifndef ZERO
1506 #ifdef _LP64
1507 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1508 if (!UseCompressedOops) {
1509 if (UseCompressedClassPointers) {
1510 warning("UseCompressedClassPointers requires UseCompressedOops");
1511 }
1512 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1513 } else {
1514 // Turn on UseCompressedClassPointers too
1515 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1516 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1517 }
1518 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1519 if (UseCompressedClassPointers) {
1520 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1521 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1522 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1523 }
1524 }
1525 }
1526 #endif // _LP64
1527 #endif // !ZERO
1528 }
1529
1530 void Arguments::set_conservative_max_heap_alignment() {
1531 // The conservative maximum required alignment for the heap is the maximum of
1532 // the alignments imposed by several sources: any requirements from the heap
1533 // itself, the collector policy and the maximum page size we may run the VM
1534 // with.
1535 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1536 #if INCLUDE_ALL_GCS
1537 if (UseParallelGC) {
1538 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1539 } else if (UseG1GC) {
1540 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1541 }
1542 #endif // INCLUDE_ALL_GCS
1543 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(),
1544 CollectorPolicy::compute_heap_alignment());
1545 }
1546
1547 void Arguments::set_ergonomics_flags() {
1548
1549 if (os::is_server_class_machine()) {
1550 // If no other collector is requested explicitly,
1551 // let the VM select the collector based on
1552 // machine class and automatic selection policy.
1553 if (!UseSerialGC &&
1554 !UseConcMarkSweepGC &&
1555 !UseG1GC &&
1556 !UseParNewGC &&
1557 FLAG_IS_DEFAULT(UseParallelGC)) {
1558 if (should_auto_select_low_pause_collector()) {
1559 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1560 } else {
1561 FLAG_SET_ERGO(bool, UseParallelGC, true);
1562 }
1563 }
1564 }
1565 #ifdef COMPILER2
1566 // Shared spaces work fine with other GCs but causes bytecode rewriting
1567 // to be disabled, which hurts interpreter performance and decreases
1568 // server performance. When -server is specified, keep the default off
1569 // unless it is asked for. Future work: either add bytecode rewriting
1570 // at link time, or rewrite bytecodes in non-shared methods.
1571 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1572 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1573 no_shared_spaces();
1574 }
1575 #endif
1576
1577 set_conservative_max_heap_alignment();
1578
1579 #ifndef ZERO
1580 #ifdef _LP64
1581 set_use_compressed_oops();
1582
1583 // set_use_compressed_klass_ptrs() must be called after calling
1584 // set_use_compressed_oops().
1585 set_use_compressed_klass_ptrs();
1586
1587 // Also checks that certain machines are slower with compressed oops
1588 // in vm_version initialization code.
1589 #endif // _LP64
1590 #endif // !ZERO
1591 }
1592
1593 void Arguments::set_parallel_gc_flags() {
1594 assert(UseParallelGC || UseParallelOldGC, "Error");
1595 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1596 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1597 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1598 }
1599 FLAG_SET_DEFAULT(UseParallelGC, true);
1600
1601 // If no heap maximum was requested explicitly, use some reasonable fraction
1602 // of the physical memory, up to a maximum of 1GB.
1603 FLAG_SET_DEFAULT(ParallelGCThreads,
1604 Abstract_VM_Version::parallel_worker_threads());
1605 if (ParallelGCThreads == 0) {
1606 jio_fprintf(defaultStream::error_stream(),
1607 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1608 vm_exit(1);
1609 }
1610
1611 if (UseAdaptiveSizePolicy) {
1612 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1613 // unless the user actually sets these flags.
1614 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1615 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1616 }
1617 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1618 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1619 }
1620 }
1621
1622 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1623 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1624 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1625 // See CR 6362902 for details.
1626 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1627 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1628 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1629 }
1630 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1631 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1632 }
1633 }
1634
1635 if (UseParallelOldGC) {
1636 // Par compact uses lower default values since they are treated as
1637 // minimums. These are different defaults because of the different
1638 // interpretation and are not ergonomically set.
1639 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1640 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1641 }
1642 }
1643 }
1644
1645 void Arguments::set_g1_gc_flags() {
1646 assert(UseG1GC, "Error");
1647 #ifdef COMPILER1
1648 FastTLABRefill = false;
1649 #endif
1650 FLAG_SET_DEFAULT(ParallelGCThreads,
1651 Abstract_VM_Version::parallel_worker_threads());
1652 if (ParallelGCThreads == 0) {
1653 FLAG_SET_DEFAULT(ParallelGCThreads,
1654 Abstract_VM_Version::parallel_worker_threads());
1655 }
1656
1657 // MarkStackSize will be set (if it hasn't been set by the user)
1658 // when concurrent marking is initialized.
1659 // Its value will be based upon the number of parallel marking threads.
1660 // But we do set the maximum mark stack size here.
1661 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1662 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1663 }
1664
1665 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1666 // In G1, we want the default GC overhead goal to be higher than
1667 // say in PS. So we set it here to 10%. Otherwise the heap might
1668 // be expanded more aggressively than we would like it to. In
1669 // fact, even 10% seems to not be high enough in some cases
1670 // (especially small GC stress tests that the main thing they do
1671 // is allocation). We might consider increase it further.
1672 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1673 }
1674
1675 if (PrintGCDetails && Verbose) {
1676 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1677 MarkStackSize / K, MarkStackSizeMax / K);
1678 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1679 }
1680 }
1681
1682 julong Arguments::limit_by_allocatable_memory(julong limit) {
1683 julong max_allocatable;
1684 julong result = limit;
1685 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1686 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1687 }
1688 return result;
1689 }
1690
1691 // Use static initialization to get the default before parsing
1692 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1693
1694 void Arguments::set_heap_size() {
1695 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1696 // Deprecated flag
1697 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1698 }
1699
1700 const julong phys_mem =
1701 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1702 : (julong)MaxRAM;
1703
1704 // If the maximum heap size has not been set with -Xmx,
1705 // then set it as fraction of the size of physical memory,
1706 // respecting the maximum and minimum sizes of the heap.
1707 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1708 julong reasonable_max = phys_mem / MaxRAMFraction;
1709
1710 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1711 // Small physical memory, so use a minimum fraction of it for the heap
1712 reasonable_max = phys_mem / MinRAMFraction;
1713 } else {
1714 // Not-small physical memory, so require a heap at least
1715 // as large as MaxHeapSize
1716 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1717 }
1718 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1719 // Limit the heap size to ErgoHeapSizeLimit
1720 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1721 }
1722 if (UseCompressedOops) {
1723 // Limit the heap size to the maximum possible when using compressed oops
1724 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1725
1726 // HeapBaseMinAddress can be greater than default but not less than.
1727 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1728 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1729 // matches compressed oops printing flags
1730 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1731 jio_fprintf(defaultStream::error_stream(),
1732 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1733 " (" UINTX_FORMAT "G) which is greater than value given "
1734 UINTX_FORMAT "\n",
1735 DefaultHeapBaseMinAddress,
1736 DefaultHeapBaseMinAddress/G,
1737 HeapBaseMinAddress);
1738 }
1739 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1740 }
1741 }
1742
1743 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1744 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1745 // but it should be not less than default MaxHeapSize.
1746 max_coop_heap -= HeapBaseMinAddress;
1747 }
1748 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1749 }
1750 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1751
1752 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1753 // An initial heap size was specified on the command line,
1754 // so be sure that the maximum size is consistent. Done
1755 // after call to limit_by_allocatable_memory because that
1756 // method might reduce the allocation size.
1757 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1758 }
1759
1760 if (PrintGCDetails && Verbose) {
1761 // Cannot use gclog_or_tty yet.
1762 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1763 }
1764 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1765 }
1766
1767 // If the minimum or initial heap_size have not been set or requested to be set
1768 // ergonomically, set them accordingly.
1769 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1770 julong reasonable_minimum = (julong)(OldSize + NewSize);
1771
1772 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1773
1774 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1775
1776 if (InitialHeapSize == 0) {
1777 julong reasonable_initial = phys_mem / InitialRAMFraction;
1778
1779 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1780 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1781
1782 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1783
1784 if (PrintGCDetails && Verbose) {
1785 // Cannot use gclog_or_tty yet.
1786 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1787 }
1788 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1789 }
1790 // If the minimum heap size has not been set (via -Xms),
1791 // synchronize with InitialHeapSize to avoid errors with the default value.
1792 if (min_heap_size() == 0) {
1793 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1794 if (PrintGCDetails && Verbose) {
1795 // Cannot use gclog_or_tty yet.
1796 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1797 }
1798 }
1799 }
1800 }
1801
1802 // This must be called after ergonomics because we want bytecode rewriting
1803 // if the server compiler is used, or if UseSharedSpaces is disabled.
1804 void Arguments::set_bytecode_flags() {
1805 // Better not attempt to store into a read-only space.
1806 if (UseSharedSpaces) {
1807 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1808 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1809 }
1810
1811 if (!RewriteBytecodes) {
1812 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1813 }
1814 }
1815
1816 // Aggressive optimization flags -XX:+AggressiveOpts
1817 void Arguments::set_aggressive_opts_flags() {
1818 #ifdef COMPILER2
1819 if (AggressiveUnboxing) {
1820 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1821 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1822 } else if (!EliminateAutoBox) {
1823 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1824 AggressiveUnboxing = false;
1825 }
1826 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1827 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1828 } else if (!DoEscapeAnalysis) {
1829 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1830 AggressiveUnboxing = false;
1831 }
1832 }
1833 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1834 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1835 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1836 }
1837 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1838 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1839 }
1840
1841 // Feed the cache size setting into the JDK
1842 char buffer[1024];
1843 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1844 add_property(buffer);
1845 }
1846 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1847 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1848 }
1849 #endif
1850
1851 if (AggressiveOpts) {
1852 // Sample flag setting code
1853 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1854 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1855 // }
1856 }
1857 }
1858
1859 //===========================================================================================================
1860 // Parsing of java.compiler property
1861
1862 void Arguments::process_java_compiler_argument(char* arg) {
1863 // For backwards compatibility, Djava.compiler=NONE or ""
1864 // causes us to switch to -Xint mode UNLESS -Xdebug
1865 // is also specified.
1866 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1867 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1868 }
1869 }
1870
1871 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1872 _sun_java_launcher = strdup(launcher);
1873 }
1874
1875 bool Arguments::created_by_java_launcher() {
1876 assert(_sun_java_launcher != NULL, "property must have value");
1877 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1878 }
1879
1880 bool Arguments::sun_java_launcher_is_altjvm() {
1881 return _sun_java_launcher_is_altjvm;
1882 }
1883
1884 //===========================================================================================================
1885 // Parsing of main arguments
1886
1887 bool Arguments::verify_interval(uintx val, uintx min,
1888 uintx max, const char* name) {
1889 // Returns true iff value is in the inclusive interval [min..max]
1890 // false, otherwise.
1891 if (val >= min && val <= max) {
1892 return true;
1893 }
1894 jio_fprintf(defaultStream::error_stream(),
1895 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1896 " and " UINTX_FORMAT "\n",
1897 name, val, min, max);
1898 return false;
1899 }
1900
1901 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1902 // Returns true if given value is at least specified min threshold
1903 // false, otherwise.
1904 if (val >= min ) {
1905 return true;
1906 }
1907 jio_fprintf(defaultStream::error_stream(),
1908 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1909 name, val, min);
1910 return false;
1911 }
1912
1913 bool Arguments::verify_percentage(uintx value, const char* name) {
1914 if (is_percentage(value)) {
1915 return true;
1916 }
1917 jio_fprintf(defaultStream::error_stream(),
1918 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1919 name, value);
1920 return false;
1921 }
1922
1923 #if !INCLUDE_ALL_GCS
1924 #ifdef ASSERT
1925 static bool verify_serial_gc_flags() {
1926 return (UseSerialGC &&
1927 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1928 UseParallelGC || UseParallelOldGC));
1929 }
1930 #endif // ASSERT
1931 #endif // INCLUDE_ALL_GCS
1932
1933 // check if do gclog rotation
1934 // +UseGCLogFileRotation is a must,
1935 // no gc log rotation when log file not supplied or
1936 // NumberOfGCLogFiles is 0
1937 void check_gclog_consistency() {
1938 if (UseGCLogFileRotation) {
1939 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1940 jio_fprintf(defaultStream::output_stream(),
1941 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1942 "where num_of_file > 0\n"
1943 "GC log rotation is turned off\n");
1944 UseGCLogFileRotation = false;
1945 }
1946 }
1947
1948 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1949 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1950 jio_fprintf(defaultStream::output_stream(),
1951 "GCLogFileSize changed to minimum 8K\n");
1952 }
1953 }
1954
1955 // This function is called for -Xloggc:<filename>, it can be used
1956 // to check if a given file name(or string) conforms to the following
1957 // specification:
1958 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1959 // %p and %t only allowed once. We only limit usage of filename not path
1960 bool is_filename_valid(const char *file_name) {
1961 const char* p = file_name;
1962 char file_sep = os::file_separator()[0];
1963 const char* cp;
1964 // skip prefix path
1965 for (cp = file_name; *cp != '\0'; cp++) {
1966 if (*cp == '/' || *cp == file_sep) {
1967 p = cp + 1;
1968 }
1969 }
1970
1971 int count_p = 0;
1972 int count_t = 0;
1973 while (*p != '\0') {
1974 if ((*p >= '0' && *p <= '9') ||
1975 (*p >= 'A' && *p <= 'Z') ||
1976 (*p >= 'a' && *p <= 'z') ||
1977 *p == '-' ||
1978 *p == '_' ||
1979 *p == '.') {
1980 p++;
1981 continue;
1982 }
1983 if (*p == '%') {
1984 if(*(p + 1) == 'p') {
1985 p += 2;
1986 count_p ++;
1987 continue;
1988 }
1989 if (*(p + 1) == 't') {
1990 p += 2;
1991 count_t ++;
1992 continue;
1993 }
1994 }
1995 return false;
1996 }
1997 return count_p < 2 && count_t < 2;
1998 }
1999
2000 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2001 if (!is_percentage(min_heap_free_ratio)) {
2002 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2003 return false;
2004 }
2005 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2006 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2007 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2008 MaxHeapFreeRatio);
2009 return false;
2010 }
2011 return true;
2012 }
2013
2014 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2015 if (!is_percentage(max_heap_free_ratio)) {
2016 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2017 return false;
2018 }
2019 if (max_heap_free_ratio < MinHeapFreeRatio) {
2020 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2021 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2022 MinHeapFreeRatio);
2023 return false;
2024 }
2025 return true;
2026 }
2027
2028 // Check consistency of GC selection
2029 bool Arguments::check_gc_consistency() {
2030 check_gclog_consistency();
2031 bool status = true;
2032 // Ensure that the user has not selected conflicting sets
2033 // of collectors. [Note: this check is merely a user convenience;
2034 // collectors over-ride each other so that only a non-conflicting
2035 // set is selected; however what the user gets is not what they
2036 // may have expected from the combination they asked for. It's
2037 // better to reduce user confusion by not allowing them to
2038 // select conflicting combinations.
2039 uint i = 0;
2040 if (UseSerialGC) i++;
2041 if (UseConcMarkSweepGC || UseParNewGC) i++;
2042 if (UseParallelGC || UseParallelOldGC) i++;
2043 if (UseG1GC) i++;
2044 if (i > 1) {
2045 jio_fprintf(defaultStream::error_stream(),
2046 "Conflicting collector combinations in option list; "
2047 "please refer to the release notes for the combinations "
2048 "allowed\n");
2049 status = false;
2050 }
2051 return status;
2052 }
2053
2054 void Arguments::check_deprecated_gcs() {
2055 if (UseConcMarkSweepGC && !UseParNewGC) {
2056 warning("Using the DefNew young collector with the CMS collector is deprecated "
2057 "and will likely be removed in a future release");
2058 }
2059
2060 if (UseParNewGC && !UseConcMarkSweepGC) {
2061 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2062 // set up UseSerialGC properly, so that can't be used in the check here.
2063 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2064 "and will likely be removed in a future release");
2065 }
2066
2067 if (CMSIncrementalMode) {
2068 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2069 }
2070 }
2071
2072 void Arguments::check_deprecated_gc_flags() {
2073 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2074 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2075 "and will likely be removed in future release");
2076 }
2077 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2078 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2079 "Use MaxRAMFraction instead.");
2080 }
2081 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2082 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2083 }
2084 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2085 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2086 }
2087 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2088 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2089 }
2090 }
2091
2092 // Check stack pages settings
2093 bool Arguments::check_stack_pages()
2094 {
2095 bool status = true;
2096 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2097 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2098 // greater stack shadow pages can't generate instruction to bang stack
2099 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2100 return status;
2101 }
2102
2103 // Check the consistency of vm_init_args
2104 bool Arguments::check_vm_args_consistency() {
2105 // Method for adding checks for flag consistency.
2106 // The intent is to warn the user of all possible conflicts,
2107 // before returning an error.
2108 // Note: Needs platform-dependent factoring.
2109 bool status = true;
2110
2111 if (TLABRefillWasteFraction == 0) {
2112 jio_fprintf(defaultStream::error_stream(),
2113 "TLABRefillWasteFraction should be a denominator, "
2114 "not " SIZE_FORMAT "\n",
2115 TLABRefillWasteFraction);
2116 status = false;
2117 }
2118
2119 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2120 "AdaptiveSizePolicyWeight");
2121 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2122
2123 // Divide by bucket size to prevent a large size from causing rollover when
2124 // calculating amount of memory needed to be allocated for the String table.
2125 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2126 (max_uintx / StringTable::bucket_size()), "StringTable size");
2127
2128 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2129 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2130
2131 {
2132 // Using "else if" below to avoid printing two error messages if min > max.
2133 // This will also prevent us from reporting both min>100 and max>100 at the
2134 // same time, but that is less annoying than printing two identical errors IMHO.
2135 FormatBuffer<80> err_msg("");
2136 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2137 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2138 status = false;
2139 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2140 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2141 status = false;
2142 }
2143 }
2144
2145 // Min/MaxMetaspaceFreeRatio
2146 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2147 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2148
2149 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2150 jio_fprintf(defaultStream::error_stream(),
2151 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2152 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2153 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2154 MinMetaspaceFreeRatio,
2155 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2156 MaxMetaspaceFreeRatio);
2157 status = false;
2158 }
2159
2160 // Trying to keep 100% free is not practical
2161 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2162
2163 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2164 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2165 }
2166
2167 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2168 // Settings to encourage splitting.
2169 if (!FLAG_IS_CMDLINE(NewRatio)) {
2170 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2171 }
2172 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2173 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2174 }
2175 }
2176
2177 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2178 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2179 if (GCTimeLimit == 100) {
2180 // Turn off gc-overhead-limit-exceeded checks
2181 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2182 }
2183
2184 status = status && check_gc_consistency();
2185 status = status && check_stack_pages();
2186
2187 if (CMSIncrementalMode) {
2188 if (!UseConcMarkSweepGC) {
2189 jio_fprintf(defaultStream::error_stream(),
2190 "error: invalid argument combination.\n"
2191 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2192 "selected in order\nto use CMSIncrementalMode.\n");
2193 status = false;
2194 } else {
2195 status = status && verify_percentage(CMSIncrementalDutyCycle,
2196 "CMSIncrementalDutyCycle");
2197 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2198 "CMSIncrementalDutyCycleMin");
2199 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2200 "CMSIncrementalSafetyFactor");
2201 status = status && verify_percentage(CMSIncrementalOffset,
2202 "CMSIncrementalOffset");
2203 status = status && verify_percentage(CMSExpAvgFactor,
2204 "CMSExpAvgFactor");
2205 // If it was not set on the command line, set
2206 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2207 if (CMSInitiatingOccupancyFraction < 0) {
2208 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2209 }
2210 }
2211 }
2212
2213 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2214 // insists that we hold the requisite locks so that the iteration is
2215 // MT-safe. For the verification at start-up and shut-down, we don't
2216 // yet have a good way of acquiring and releasing these locks,
2217 // which are not visible at the CollectedHeap level. We want to
2218 // be able to acquire these locks and then do the iteration rather
2219 // than just disable the lock verification. This will be fixed under
2220 // bug 4788986.
2221 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2222 if (VerifyDuringStartup) {
2223 warning("Heap verification at start-up disabled "
2224 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2225 VerifyDuringStartup = false; // Disable verification at start-up
2226 }
2227
2228 if (VerifyBeforeExit) {
2229 warning("Heap verification at shutdown disabled "
2230 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2231 VerifyBeforeExit = false; // Disable verification at shutdown
2232 }
2233 }
2234
2235 // Note: only executed in non-PRODUCT mode
2236 if (!UseAsyncConcMarkSweepGC &&
2237 (ExplicitGCInvokesConcurrent ||
2238 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2239 jio_fprintf(defaultStream::error_stream(),
2240 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2241 " with -UseAsyncConcMarkSweepGC");
2242 status = false;
2243 }
2244
2245 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2246
2247 #if INCLUDE_ALL_GCS
2248 if (UseG1GC) {
2249 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2250 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2251 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2252
2253 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2254 "InitiatingHeapOccupancyPercent");
2255 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2256 "G1RefProcDrainInterval");
2257 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2258 "G1ConcMarkStepDurationMillis");
2259 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2260 "G1ConcRSHotCardLimit");
2261 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2262 "G1ConcRSLogCacheSize");
2263 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2264 "StringDeduplicationAgeThreshold");
2265 }
2266 if (UseConcMarkSweepGC) {
2267 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2268 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2269 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2270 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2271
2272 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2273
2274 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2275 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2276 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2277
2278 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2279
2280 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2281 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2282
2283 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2284 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2285 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2286
2287 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2288
2289 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2290
2291 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2292 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2293 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2294 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2295 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2296 }
2297
2298 if (UseParallelGC || UseParallelOldGC) {
2299 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2300 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2301
2302 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2303 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2304
2305 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2306 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2307
2308 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2309
2310 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2311 }
2312 #endif // INCLUDE_ALL_GCS
2313
2314 status = status && verify_interval(RefDiscoveryPolicy,
2315 ReferenceProcessor::DiscoveryPolicyMin,
2316 ReferenceProcessor::DiscoveryPolicyMax,
2317 "RefDiscoveryPolicy");
2318
2319 // Limit the lower bound of this flag to 1 as it is used in a division
2320 // expression.
2321 status = status && verify_interval(TLABWasteTargetPercent,
2322 1, 100, "TLABWasteTargetPercent");
2323
2324 status = status && verify_object_alignment();
2325
2326 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2327 "CompressedClassSpaceSize");
2328
2329 status = status && verify_interval(MarkStackSizeMax,
2330 1, (max_jint - 1), "MarkStackSizeMax");
2331 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2332
2333 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2334
2335 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2336
2337 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2338
2339 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2340 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2341
2342 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2343
2344 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2345 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2346 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2347 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2348
2349 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2350 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2351
2352 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2353 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2354 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2355
2356 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2357 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2358
2359 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2360 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2361 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2362 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2363
2364 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2365
2366 if (PrintNMTStatistics) {
2367 #if INCLUDE_NMT
2368 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2369 #endif // INCLUDE_NMT
2370 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2371 PrintNMTStatistics = false;
2372 #if INCLUDE_NMT
2373 }
2374 #endif
2375 }
2376
2377 // Need to limit the extent of the padding to reasonable size.
2378 // 8K is well beyond the reasonable HW cache line size, even with the
2379 // aggressive prefetching, while still leaving the room for segregating
2380 // among the distinct pages.
2381 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2382 jio_fprintf(defaultStream::error_stream(),
2383 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2384 ContendedPaddingWidth, 0, 8192);
2385 status = false;
2386 }
2387
2388 // Need to enforce the padding not to break the existing field alignments.
2389 // It is sufficient to check against the largest type size.
2390 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2391 jio_fprintf(defaultStream::error_stream(),
2392 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2393 ContendedPaddingWidth, BytesPerLong);
2394 status = false;
2395 }
2396
2397 // Check lower bounds of the code cache
2398 // Template Interpreter code is approximately 3X larger in debug builds.
2399 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2400 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2401 jio_fprintf(defaultStream::error_stream(),
2402 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2403 os::vm_page_size()/K);
2404 status = false;
2405 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2406 jio_fprintf(defaultStream::error_stream(),
2407 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2408 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2409 status = false;
2410 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2411 jio_fprintf(defaultStream::error_stream(),
2412 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2413 min_code_cache_size/K);
2414 status = false;
2415 } else if (ReservedCodeCacheSize > 2*G) {
2416 // Code cache size larger than MAXINT is not supported.
2417 jio_fprintf(defaultStream::error_stream(),
2418 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2419 (2*G)/M);
2420 status = false;
2421 }
2422
2423 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2424 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2425 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2426 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2427
2428 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2429 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2430 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2431 // Check the minimum number of compiler threads
2432 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2433
2434 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2435 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2436 }
2437
2438 return status;
2439 }
2440
2441 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2442 const char* option_type) {
2443 if (ignore) return false;
2444
2445 const char* spacer = " ";
2446 if (option_type == NULL) {
2447 option_type = ++spacer; // Set both to the empty string.
2448 }
2449
2450 if (os::obsolete_option(option)) {
2451 jio_fprintf(defaultStream::error_stream(),
2452 "Obsolete %s%soption: %s\n", option_type, spacer,
2453 option->optionString);
2454 return false;
2455 } else {
2456 jio_fprintf(defaultStream::error_stream(),
2457 "Unrecognized %s%soption: %s\n", option_type, spacer,
2458 option->optionString);
2459 return true;
2460 }
2461 }
2462
2463 static const char* user_assertion_options[] = {
2464 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2465 };
2466
2467 static const char* system_assertion_options[] = {
2468 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2469 };
2470
2471 // Return true if any of the strings in null-terminated array 'names' matches.
2472 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2473 // the option must match exactly.
2474 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2475 bool tail_allowed) {
2476 for (/* empty */; *names != NULL; ++names) {
2477 if (match_option(option, *names, tail)) {
2478 if (**tail == '\0' || tail_allowed && **tail == ':') {
2479 return true;
2480 }
2481 }
2482 }
2483 return false;
2484 }
2485
2486 bool Arguments::parse_uintx(const char* value,
2487 uintx* uintx_arg,
2488 uintx min_size) {
2489
2490 // Check the sign first since atomull() parses only unsigned values.
2491 bool value_is_positive = !(*value == '-');
2492
2493 if (value_is_positive) {
2494 julong n;
2495 bool good_return = atomull(value, &n);
2496 if (good_return) {
2497 bool above_minimum = n >= min_size;
2498 bool value_is_too_large = n > max_uintx;
2499
2500 if (above_minimum && !value_is_too_large) {
2501 *uintx_arg = n;
2502 return true;
2503 }
2504 }
2505 }
2506 return false;
2507 }
2508
2509 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2510 julong* long_arg,
2511 julong min_size) {
2512 if (!atomull(s, long_arg)) return arg_unreadable;
2513 return check_memory_size(*long_arg, min_size);
2514 }
2515
2516 // Parse JavaVMInitArgs structure
2517
2518 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2519 // For components of the system classpath.
2520 SysClassPath scp(Arguments::get_sysclasspath());
2521 bool scp_assembly_required = false;
2522
2523 // Save default settings for some mode flags
2524 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2525 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2526 Arguments::_ClipInlining = ClipInlining;
2527 Arguments::_BackgroundCompilation = BackgroundCompilation;
2528
2529 // Setup flags for mixed which is the default
2530 set_mode_flags(_mixed);
2531
2532 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2533 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2534 if (result != JNI_OK) {
2535 return result;
2536 }
2537
2538 // Parse JavaVMInitArgs structure passed in
2539 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2540 if (result != JNI_OK) {
2541 return result;
2542 }
2543
2544 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2545 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2546 if (result != JNI_OK) {
2547 return result;
2548 }
2549
2550 // Do final processing now that all arguments have been parsed
2551 result = finalize_vm_init_args(&scp, scp_assembly_required);
2552 if (result != JNI_OK) {
2553 return result;
2554 }
2555
2556 return JNI_OK;
2557 }
2558
2559 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2560 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2561 // are dealing with -agentpath (case where name is a path), otherwise with
2562 // -agentlib
2563 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2564 char *_name;
2565 const char *_hprof = "hprof", *_jdwp = "jdwp";
2566 size_t _len_hprof, _len_jdwp, _len_prefix;
2567
2568 if (is_path) {
2569 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2570 return false;
2571 }
2572
2573 _name++; // skip past last path separator
2574 _len_prefix = strlen(JNI_LIB_PREFIX);
2575
2576 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2577 return false;
2578 }
2579
2580 _name += _len_prefix;
2581 _len_hprof = strlen(_hprof);
2582 _len_jdwp = strlen(_jdwp);
2583
2584 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2585 _name += _len_hprof;
2586 }
2587 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2588 _name += _len_jdwp;
2589 }
2590 else {
2591 return false;
2592 }
2593
2594 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2595 return false;
2596 }
2597
2598 return true;
2599 }
2600
2601 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2602 return true;
2603 }
2604
2605 return false;
2606 }
2607
2608 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2609 SysClassPath* scp_p,
2610 bool* scp_assembly_required_p,
2611 Flag::Flags origin) {
2612 // Remaining part of option string
2613 const char* tail;
2614
2615 // iterate over arguments
2616 for (int index = 0; index < args->nOptions; index++) {
2617 bool is_absolute_path = false; // for -agentpath vs -agentlib
2618
2619 const JavaVMOption* option = args->options + index;
2620
2621 if (!match_option(option, "-Djava.class.path", &tail) &&
2622 !match_option(option, "-Dsun.java.command", &tail) &&
2623 !match_option(option, "-Dsun.java.launcher", &tail)) {
2624
2625 // add all jvm options to the jvm_args string. This string
2626 // is used later to set the java.vm.args PerfData string constant.
2627 // the -Djava.class.path and the -Dsun.java.command options are
2628 // omitted from jvm_args string as each have their own PerfData
2629 // string constant object.
2630 build_jvm_args(option->optionString);
2631 }
2632
2633 // -verbose:[class/gc/jni]
2634 if (match_option(option, "-verbose", &tail)) {
2635 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2636 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2637 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2638 } else if (!strcmp(tail, ":gc")) {
2639 FLAG_SET_CMDLINE(bool, PrintGC, true);
2640 } else if (!strcmp(tail, ":jni")) {
2641 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2642 }
2643 // -da / -ea / -disableassertions / -enableassertions
2644 // These accept an optional class/package name separated by a colon, e.g.,
2645 // -da:java.lang.Thread.
2646 } else if (match_option(option, user_assertion_options, &tail, true)) {
2647 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2648 if (*tail == '\0') {
2649 JavaAssertions::setUserClassDefault(enable);
2650 } else {
2651 assert(*tail == ':', "bogus match by match_option()");
2652 JavaAssertions::addOption(tail + 1, enable);
2653 }
2654 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2655 } else if (match_option(option, system_assertion_options, &tail, false)) {
2656 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2657 JavaAssertions::setSystemClassDefault(enable);
2658 // -bootclasspath:
2659 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2660 scp_p->reset_path(tail);
2661 *scp_assembly_required_p = true;
2662 // -bootclasspath/a:
2663 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2664 scp_p->add_suffix(tail);
2665 *scp_assembly_required_p = true;
2666 // -bootclasspath/p:
2667 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2668 scp_p->add_prefix(tail);
2669 *scp_assembly_required_p = true;
2670 // -Xrun
2671 } else if (match_option(option, "-Xrun", &tail)) {
2672 if (tail != NULL) {
2673 const char* pos = strchr(tail, ':');
2674 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2675 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2676 name[len] = '\0';
2677
2678 char *options = NULL;
2679 if(pos != NULL) {
2680 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2681 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2682 }
2683 #if !INCLUDE_JVMTI
2684 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2685 jio_fprintf(defaultStream::error_stream(),
2686 "Profiling and debugging agents are not supported in this VM\n");
2687 return JNI_ERR;
2688 }
2689 #endif // !INCLUDE_JVMTI
2690 add_init_library(name, options);
2691 }
2692 // -agentlib and -agentpath
2693 } else if (match_option(option, "-agentlib:", &tail) ||
2694 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2695 if(tail != NULL) {
2696 const char* pos = strchr(tail, '=');
2697 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2698 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2699 name[len] = '\0';
2700
2701 char *options = NULL;
2702 if(pos != NULL) {
2703 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2704 }
2705 #if !INCLUDE_JVMTI
2706 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2707 jio_fprintf(defaultStream::error_stream(),
2708 "Profiling and debugging agents are not supported in this VM\n");
2709 return JNI_ERR;
2710 }
2711 #endif // !INCLUDE_JVMTI
2712 add_init_agent(name, options, is_absolute_path);
2713 }
2714 // -javaagent
2715 } else if (match_option(option, "-javaagent:", &tail)) {
2716 #if !INCLUDE_JVMTI
2717 jio_fprintf(defaultStream::error_stream(),
2718 "Instrumentation agents are not supported in this VM\n");
2719 return JNI_ERR;
2720 #else
2721 if(tail != NULL) {
2722 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2723 add_init_agent("instrument", options, false);
2724 }
2725 #endif // !INCLUDE_JVMTI
2726 // -Xnoclassgc
2727 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2728 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2729 // -Xincgc: i-CMS
2730 } else if (match_option(option, "-Xincgc", &tail)) {
2731 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2732 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2733 // -Xnoincgc: no i-CMS
2734 } else if (match_option(option, "-Xnoincgc", &tail)) {
2735 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2736 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2737 // -Xconcgc
2738 } else if (match_option(option, "-Xconcgc", &tail)) {
2739 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2740 // -Xnoconcgc
2741 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2742 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2743 // -Xbatch
2744 } else if (match_option(option, "-Xbatch", &tail)) {
2745 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2746 // -Xmn for compatibility with other JVM vendors
2747 } else if (match_option(option, "-Xmn", &tail)) {
2748 julong long_initial_young_size = 0;
2749 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2750 if (errcode != arg_in_range) {
2751 jio_fprintf(defaultStream::error_stream(),
2752 "Invalid initial young generation size: %s\n", option->optionString);
2753 describe_range_error(errcode);
2754 return JNI_EINVAL;
2755 }
2756 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2757 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2758 // -Xms
2759 } else if (match_option(option, "-Xms", &tail)) {
2760 julong long_initial_heap_size = 0;
2761 // an initial heap size of 0 means automatically determine
2762 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2763 if (errcode != arg_in_range) {
2764 jio_fprintf(defaultStream::error_stream(),
2765 "Invalid initial heap size: %s\n", option->optionString);
2766 describe_range_error(errcode);
2767 return JNI_EINVAL;
2768 }
2769 set_min_heap_size((uintx)long_initial_heap_size);
2770 // Currently the minimum size and the initial heap sizes are the same.
2771 // Can be overridden with -XX:InitialHeapSize.
2772 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2773 // -Xmx
2774 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2775 julong long_max_heap_size = 0;
2776 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2777 if (errcode != arg_in_range) {
2778 jio_fprintf(defaultStream::error_stream(),
2779 "Invalid maximum heap size: %s\n", option->optionString);
2780 describe_range_error(errcode);
2781 return JNI_EINVAL;
2782 }
2783 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2784 // Xmaxf
2785 } else if (match_option(option, "-Xmaxf", &tail)) {
2786 char* err;
2787 int maxf = (int)(strtod(tail, &err) * 100);
2788 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2789 jio_fprintf(defaultStream::error_stream(),
2790 "Bad max heap free percentage size: %s\n",
2791 option->optionString);
2792 return JNI_EINVAL;
2793 } else {
2794 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2795 }
2796 // Xminf
2797 } else if (match_option(option, "-Xminf", &tail)) {
2798 char* err;
2799 int minf = (int)(strtod(tail, &err) * 100);
2800 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2801 jio_fprintf(defaultStream::error_stream(),
2802 "Bad min heap free percentage size: %s\n",
2803 option->optionString);
2804 return JNI_EINVAL;
2805 } else {
2806 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2807 }
2808 // -Xss
2809 } else if (match_option(option, "-Xss", &tail)) {
2810 julong long_ThreadStackSize = 0;
2811 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2812 if (errcode != arg_in_range) {
2813 jio_fprintf(defaultStream::error_stream(),
2814 "Invalid thread stack size: %s\n", option->optionString);
2815 describe_range_error(errcode);
2816 return JNI_EINVAL;
2817 }
2818 // Internally track ThreadStackSize in units of 1024 bytes.
2819 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2820 round_to((int)long_ThreadStackSize, K) / K);
2821 // -Xoss
2822 } else if (match_option(option, "-Xoss", &tail)) {
2823 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2824 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2825 julong long_CodeCacheExpansionSize = 0;
2826 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2827 if (errcode != arg_in_range) {
2828 jio_fprintf(defaultStream::error_stream(),
2829 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2830 os::vm_page_size()/K);
2831 return JNI_EINVAL;
2832 }
2833 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2834 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2835 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2836 julong long_ReservedCodeCacheSize = 0;
2837
2838 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2839 if (errcode != arg_in_range) {
2840 jio_fprintf(defaultStream::error_stream(),
2841 "Invalid maximum code cache size: %s.\n", option->optionString);
2842 return JNI_EINVAL;
2843 }
2844 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2845 //-XX:IncreaseFirstTierCompileThresholdAt=
2846 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2847 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2848 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2849 jio_fprintf(defaultStream::error_stream(),
2850 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2851 option->optionString);
2852 return JNI_EINVAL;
2853 }
2854 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2855 // -green
2856 } else if (match_option(option, "-green", &tail)) {
2857 jio_fprintf(defaultStream::error_stream(),
2858 "Green threads support not available\n");
2859 return JNI_EINVAL;
2860 // -native
2861 } else if (match_option(option, "-native", &tail)) {
2862 // HotSpot always uses native threads, ignore silently for compatibility
2863 // -Xsqnopause
2864 } else if (match_option(option, "-Xsqnopause", &tail)) {
2865 // EVM option, ignore silently for compatibility
2866 // -Xrs
2867 } else if (match_option(option, "-Xrs", &tail)) {
2868 // Classic/EVM option, new functionality
2869 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2870 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2871 // change default internal VM signals used - lower case for back compat
2872 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2873 // -Xoptimize
2874 } else if (match_option(option, "-Xoptimize", &tail)) {
2875 // EVM option, ignore silently for compatibility
2876 // -Xprof
2877 } else if (match_option(option, "-Xprof", &tail)) {
2878 #if INCLUDE_FPROF
2879 _has_profile = true;
2880 #else // INCLUDE_FPROF
2881 jio_fprintf(defaultStream::error_stream(),
2882 "Flat profiling is not supported in this VM.\n");
2883 return JNI_ERR;
2884 #endif // INCLUDE_FPROF
2885 // -Xconcurrentio
2886 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2887 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2888 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2889 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2890 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2891 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2892
2893 // -Xinternalversion
2894 } else if (match_option(option, "-Xinternalversion", &tail)) {
2895 jio_fprintf(defaultStream::output_stream(), "%s\n",
2896 VM_Version::internal_vm_info_string());
2897 vm_exit(0);
2898 #ifndef PRODUCT
2899 // -Xprintflags
2900 } else if (match_option(option, "-Xprintflags", &tail)) {
2901 CommandLineFlags::printFlags(tty, false);
2902 vm_exit(0);
2903 #endif
2904 // -D
2905 } else if (match_option(option, "-D", &tail)) {
2906 if (!add_property(tail)) {
2907 return JNI_ENOMEM;
2908 }
2909 // Out of the box management support
2910 if (match_option(option, "-Dcom.sun.management", &tail)) {
2911 #if INCLUDE_MANAGEMENT
2912 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2913 #else
2914 jio_fprintf(defaultStream::output_stream(),
2915 "-Dcom.sun.management is not supported in this VM.\n");
2916 return JNI_ERR;
2917 #endif
2918 }
2919 // -Xint
2920 } else if (match_option(option, "-Xint", &tail)) {
2921 set_mode_flags(_int);
2922 // -Xmixed
2923 } else if (match_option(option, "-Xmixed", &tail)) {
2924 set_mode_flags(_mixed);
2925 // -Xcomp
2926 } else if (match_option(option, "-Xcomp", &tail)) {
2927 // for testing the compiler; turn off all flags that inhibit compilation
2928 set_mode_flags(_comp);
2929 // -Xshare:dump
2930 } else if (match_option(option, "-Xshare:dump", &tail)) {
2931 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2932 set_mode_flags(_int); // Prevent compilation, which creates objects
2933 // -Xshare:on
2934 } else if (match_option(option, "-Xshare:on", &tail)) {
2935 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2936 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2937 // -Xshare:auto
2938 } else if (match_option(option, "-Xshare:auto", &tail)) {
2939 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2940 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2941 // -Xshare:off
2942 } else if (match_option(option, "-Xshare:off", &tail)) {
2943 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2944 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2945 // -Xverify
2946 } else if (match_option(option, "-Xverify", &tail)) {
2947 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2948 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2949 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2950 } else if (strcmp(tail, ":remote") == 0) {
2951 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2952 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2953 } else if (strcmp(tail, ":none") == 0) {
2954 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2955 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2956 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2957 return JNI_EINVAL;
2958 }
2959 // -Xdebug
2960 } else if (match_option(option, "-Xdebug", &tail)) {
2961 // note this flag has been used, then ignore
2962 set_xdebug_mode(true);
2963 // -Xnoagent
2964 } else if (match_option(option, "-Xnoagent", &tail)) {
2965 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2966 } else if (match_option(option, "-Xboundthreads", &tail)) {
2967 // Bind user level threads to kernel threads (Solaris only)
2968 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2969 } else if (match_option(option, "-Xloggc:", &tail)) {
2970 // Redirect GC output to the file. -Xloggc:<filename>
2971 // ostream_init_log(), when called will use this filename
2972 // to initialize a fileStream.
2973 _gc_log_filename = strdup(tail);
2974 if (!is_filename_valid(_gc_log_filename)) {
2975 jio_fprintf(defaultStream::output_stream(),
2976 "Invalid file name for use with -Xloggc: Filename can only contain the "
2977 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2978 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2979 return JNI_EINVAL;
2980 }
2981 FLAG_SET_CMDLINE(bool, PrintGC, true);
2982 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2983
2984 // JNI hooks
2985 } else if (match_option(option, "-Xcheck", &tail)) {
2986 if (!strcmp(tail, ":jni")) {
2987 #if !INCLUDE_JNI_CHECK
2988 warning("JNI CHECKING is not supported in this VM");
2989 #else
2990 CheckJNICalls = true;
2991 #endif // INCLUDE_JNI_CHECK
2992 } else if (is_bad_option(option, args->ignoreUnrecognized,
2993 "check")) {
2994 return JNI_EINVAL;
2995 }
2996 } else if (match_option(option, "vfprintf", &tail)) {
2997 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2998 } else if (match_option(option, "exit", &tail)) {
2999 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3000 } else if (match_option(option, "abort", &tail)) {
3001 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3002 // -XX:+AggressiveHeap
3003 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3004
3005 // This option inspects the machine and attempts to set various
3006 // parameters to be optimal for long-running, memory allocation
3007 // intensive jobs. It is intended for machines with large
3008 // amounts of cpu and memory.
3009
3010 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3011 // VM, but we may not be able to represent the total physical memory
3012 // available (like having 8gb of memory on a box but using a 32bit VM).
3013 // Thus, we need to make sure we're using a julong for intermediate
3014 // calculations.
3015 julong initHeapSize;
3016 julong total_memory = os::physical_memory();
3017
3018 if (total_memory < (julong)256*M) {
3019 jio_fprintf(defaultStream::error_stream(),
3020 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3021 vm_exit(1);
3022 }
3023
3024 // The heap size is half of available memory, or (at most)
3025 // all of possible memory less 160mb (leaving room for the OS
3026 // when using ISM). This is the maximum; because adaptive sizing
3027 // is turned on below, the actual space used may be smaller.
3028
3029 initHeapSize = MIN2(total_memory / (julong)2,
3030 total_memory - (julong)160*M);
3031
3032 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3033
3034 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3035 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3036 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3037 // Currently the minimum size and the initial heap sizes are the same.
3038 set_min_heap_size(initHeapSize);
3039 }
3040 if (FLAG_IS_DEFAULT(NewSize)) {
3041 // Make the young generation 3/8ths of the total heap.
3042 FLAG_SET_CMDLINE(uintx, NewSize,
3043 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3044 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3045 }
3046
3047 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3048 FLAG_SET_DEFAULT(UseLargePages, true);
3049 #endif
3050
3051 // Increase some data structure sizes for efficiency
3052 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3053 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3054 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3055
3056 // See the OldPLABSize comment below, but replace 'after promotion'
3057 // with 'after copying'. YoungPLABSize is the size of the survivor
3058 // space per-gc-thread buffers. The default is 4kw.
3059 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3060
3061 // OldPLABSize is the size of the buffers in the old gen that
3062 // UseParallelGC uses to promote live data that doesn't fit in the
3063 // survivor spaces. At any given time, there's one for each gc thread.
3064 // The default size is 1kw. These buffers are rarely used, since the
3065 // survivor spaces are usually big enough. For specjbb, however, there
3066 // are occasions when there's lots of live data in the young gen
3067 // and we end up promoting some of it. We don't have a definite
3068 // explanation for why bumping OldPLABSize helps, but the theory
3069 // is that a bigger PLAB results in retaining something like the
3070 // original allocation order after promotion, which improves mutator
3071 // locality. A minor effect may be that larger PLABs reduce the
3072 // number of PLAB allocation events during gc. The value of 8kw
3073 // was arrived at by experimenting with specjbb.
3074 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3075
3076 // Enable parallel GC and adaptive generation sizing
3077 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3078 FLAG_SET_DEFAULT(ParallelGCThreads,
3079 Abstract_VM_Version::parallel_worker_threads());
3080
3081 // Encourage steady state memory management
3082 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3083
3084 // This appears to improve mutator locality
3085 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3086
3087 // Get around early Solaris scheduling bug
3088 // (affinity vs other jobs on system)
3089 // but disallow DR and offlining (5008695).
3090 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3091
3092 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3093 // and the last option wins.
3094 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3095 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3096 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3097 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3098 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3099 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3100 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3101 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3102 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3103 uintx max_tenuring_thresh = 0;
3104 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3105 jio_fprintf(defaultStream::error_stream(),
3106 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3107 }
3108 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3109
3110 if (MaxTenuringThreshold == 0) {
3111 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3112 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3113 } else {
3114 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3115 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3116 }
3117 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3118 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3119 jio_fprintf(defaultStream::error_stream(),
3120 "Please use CMSClassUnloadingEnabled in place of "
3121 "CMSPermGenSweepingEnabled in the future\n");
3122 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3123 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3124 jio_fprintf(defaultStream::error_stream(),
3125 "Please use -XX:+UseGCOverheadLimit in place of "
3126 "-XX:+UseGCTimeLimit in the future\n");
3127 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3128 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3129 jio_fprintf(defaultStream::error_stream(),
3130 "Please use -XX:-UseGCOverheadLimit in place of "
3131 "-XX:-UseGCTimeLimit in the future\n");
3132 // The TLE options are for compatibility with 1.3 and will be
3133 // removed without notice in a future release. These options
3134 // are not to be documented.
3135 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3136 // No longer used.
3137 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3138 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3139 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3140 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3141 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3142 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3143 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3144 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3145 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3146 // No longer used.
3147 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3148 julong long_tlab_size = 0;
3149 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3150 if (errcode != arg_in_range) {
3151 jio_fprintf(defaultStream::error_stream(),
3152 "Invalid TLAB size: %s\n", option->optionString);
3153 describe_range_error(errcode);
3154 return JNI_EINVAL;
3155 }
3156 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3157 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3158 // No longer used.
3159 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3160 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3161 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3162 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3163 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3164 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3165 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3166 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3167 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3168 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3169 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3170 #if defined(DTRACE_ENABLED)
3171 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3172 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3173 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3174 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3175 #else // defined(DTRACE_ENABLED)
3176 jio_fprintf(defaultStream::error_stream(),
3177 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3178 return JNI_EINVAL;
3179 #endif // defined(DTRACE_ENABLED)
3180 #ifdef ASSERT
3181 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3182 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3183 // disable scavenge before parallel mark-compact
3184 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3185 #endif
3186 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3187 julong cms_blocks_to_claim = (julong)atol(tail);
3188 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3189 jio_fprintf(defaultStream::error_stream(),
3190 "Please use -XX:OldPLABSize in place of "
3191 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3192 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3193 julong cms_blocks_to_claim = (julong)atol(tail);
3194 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3195 jio_fprintf(defaultStream::error_stream(),
3196 "Please use -XX:OldPLABSize in place of "
3197 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3198 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3199 julong old_plab_size = 0;
3200 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3201 if (errcode != arg_in_range) {
3202 jio_fprintf(defaultStream::error_stream(),
3203 "Invalid old PLAB size: %s\n", option->optionString);
3204 describe_range_error(errcode);
3205 return JNI_EINVAL;
3206 }
3207 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3208 jio_fprintf(defaultStream::error_stream(),
3209 "Please use -XX:OldPLABSize in place of "
3210 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3211 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3212 julong young_plab_size = 0;
3213 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3214 if (errcode != arg_in_range) {
3215 jio_fprintf(defaultStream::error_stream(),
3216 "Invalid young PLAB size: %s\n", option->optionString);
3217 describe_range_error(errcode);
3218 return JNI_EINVAL;
3219 }
3220 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3221 jio_fprintf(defaultStream::error_stream(),
3222 "Please use -XX:YoungPLABSize in place of "
3223 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3224 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3225 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3226 julong stack_size = 0;
3227 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3228 if (errcode != arg_in_range) {
3229 jio_fprintf(defaultStream::error_stream(),
3230 "Invalid mark stack size: %s\n", option->optionString);
3231 describe_range_error(errcode);
3232 return JNI_EINVAL;
3233 }
3234 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3235 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3236 julong max_stack_size = 0;
3237 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3238 if (errcode != arg_in_range) {
3239 jio_fprintf(defaultStream::error_stream(),
3240 "Invalid maximum mark stack size: %s\n",
3241 option->optionString);
3242 describe_range_error(errcode);
3243 return JNI_EINVAL;
3244 }
3245 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3246 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3247 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3248 uintx conc_threads = 0;
3249 if (!parse_uintx(tail, &conc_threads, 1)) {
3250 jio_fprintf(defaultStream::error_stream(),
3251 "Invalid concurrent threads: %s\n", option->optionString);
3252 return JNI_EINVAL;
3253 }
3254 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3255 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3256 julong max_direct_memory_size = 0;
3257 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3258 if (errcode != arg_in_range) {
3259 jio_fprintf(defaultStream::error_stream(),
3260 "Invalid maximum direct memory size: %s\n",
3261 option->optionString);
3262 describe_range_error(errcode);
3263 return JNI_EINVAL;
3264 }
3265 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3266 #if !INCLUDE_MANAGEMENT
3267 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3268 jio_fprintf(defaultStream::error_stream(),
3269 "ManagementServer is not supported in this VM.\n");
3270 return JNI_ERR;
3271 #endif // INCLUDE_MANAGEMENT
3272 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3273 // Skip -XX:Flags= since that case has already been handled
3274 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3275 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3276 return JNI_EINVAL;
3277 }
3278 }
3279 // Unknown option
3280 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3281 return JNI_ERR;
3282 }
3283 }
3284
3285 // Change the default value for flags which have different default values
3286 // when working with older JDKs.
3287 #ifdef LINUX
3288 if (JDK_Version::current().compare_major(6) <= 0 &&
3289 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3290 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3291 }
3292 #endif // LINUX
3293 return JNI_OK;
3294 }
3295
3296 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3297 // This must be done after all -D arguments have been processed.
3298 scp_p->expand_endorsed();
3299
3300 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3301 // Assemble the bootclasspath elements into the final path.
3302 Arguments::set_sysclasspath(scp_p->combined_path());
3303 }
3304
3305 // This must be done after all arguments have been processed.
3306 // java_compiler() true means set to "NONE" or empty.
3307 if (java_compiler() && !xdebug_mode()) {
3308 // For backwards compatibility, we switch to interpreted mode if
3309 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3310 // not specified.
3311 set_mode_flags(_int);
3312 }
3313 if (CompileThreshold == 0) {
3314 set_mode_flags(_int);
3315 }
3316
3317 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3318 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3319 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3320 }
3321
3322 #ifndef COMPILER2
3323 // Don't degrade server performance for footprint
3324 if (FLAG_IS_DEFAULT(UseLargePages) &&
3325 MaxHeapSize < LargePageHeapSizeThreshold) {
3326 // No need for large granularity pages w/small heaps.
3327 // Note that large pages are enabled/disabled for both the
3328 // Java heap and the code cache.
3329 FLAG_SET_DEFAULT(UseLargePages, false);
3330 }
3331
3332 #else
3333 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3334 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3335 }
3336 #endif
3337
3338 #ifndef TIERED
3339 // Tiered compilation is undefined.
3340 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3341 #endif
3342
3343 // If we are running in a headless jre, force java.awt.headless property
3344 // to be true unless the property has already been set.
3345 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3346 if (os::is_headless_jre()) {
3347 const char* headless = Arguments::get_property("java.awt.headless");
3348 if (headless == NULL) {
3349 char envbuffer[128];
3350 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3351 if (!add_property("java.awt.headless=true")) {
3352 return JNI_ENOMEM;
3353 }
3354 } else {
3355 char buffer[256];
3356 strcpy(buffer, "java.awt.headless=");
3357 strcat(buffer, envbuffer);
3358 if (!add_property(buffer)) {
3359 return JNI_ENOMEM;
3360 }
3361 }
3362 }
3363 }
3364
3365 if (!check_vm_args_consistency()) {
3366 return JNI_ERR;
3367 }
3368
3369 return JNI_OK;
3370 }
3371
3372 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3373 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3374 scp_assembly_required_p);
3375 }
3376
3377 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3378 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3379 scp_assembly_required_p);
3380 }
3381
3382 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3383 const int N_MAX_OPTIONS = 64;
3384 const int OPTION_BUFFER_SIZE = 1024;
3385 char buffer[OPTION_BUFFER_SIZE];
3386
3387 // The variable will be ignored if it exceeds the length of the buffer.
3388 // Don't check this variable if user has special privileges
3389 // (e.g. unix su command).
3390 if (os::getenv(name, buffer, sizeof(buffer)) &&
3391 !os::have_special_privileges()) {
3392 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3393 jio_fprintf(defaultStream::error_stream(),
3394 "Picked up %s: %s\n", name, buffer);
3395 char* rd = buffer; // pointer to the input string (rd)
3396 int i;
3397 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3398 while (isspace(*rd)) rd++; // skip whitespace
3399 if (*rd == 0) break; // we re done when the input string is read completely
3400
3401 // The output, option string, overwrites the input string.
3402 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3403 // input string (rd).
3404 char* wrt = rd;
3405
3406 options[i++].optionString = wrt; // Fill in option
3407 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3408 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3409 int quote = *rd; // matching quote to look for
3410 rd++; // don't copy open quote
3411 while (*rd != quote) { // include everything (even spaces) up until quote
3412 if (*rd == 0) { // string termination means unmatched string
3413 jio_fprintf(defaultStream::error_stream(),
3414 "Unmatched quote in %s\n", name);
3415 return JNI_ERR;
3416 }
3417 *wrt++ = *rd++; // copy to option string
3418 }
3419 rd++; // don't copy close quote
3420 } else {
3421 *wrt++ = *rd++; // copy to option string
3422 }
3423 }
3424 // Need to check if we're done before writing a NULL,
3425 // because the write could be to the byte that rd is pointing to.
3426 if (*rd++ == 0) {
3427 *wrt = 0;
3428 break;
3429 }
3430 *wrt = 0; // Zero terminate option
3431 }
3432 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3433 JavaVMInitArgs vm_args;
3434 vm_args.version = JNI_VERSION_1_2;
3435 vm_args.options = options;
3436 vm_args.nOptions = i;
3437 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3438
3439 if (PrintVMOptions) {
3440 const char* tail;
3441 for (int i = 0; i < vm_args.nOptions; i++) {
3442 const JavaVMOption *option = vm_args.options + i;
3443 if (match_option(option, "-XX:", &tail)) {
3444 logOption(tail);
3445 }
3446 }
3447 }
3448
3449 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3450 }
3451 return JNI_OK;
3452 }
3453
3454 void Arguments::set_shared_spaces_flags() {
3455 if (DumpSharedSpaces) {
3456 if (RequireSharedSpaces) {
3457 warning("cannot dump shared archive while using shared archive");
3458 }
3459 UseSharedSpaces = false;
3460 #ifdef _LP64
3461 if (!UseCompressedOops || !UseCompressedClassPointers) {
3462 vm_exit_during_initialization(
3463 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3464 }
3465 } else {
3466 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3467 if (!UseCompressedOops || !UseCompressedClassPointers) {
3468 no_shared_spaces();
3469 }
3470 #endif
3471 }
3472 }
3473
3474 #if !INCLUDE_ALL_GCS
3475 static void force_serial_gc() {
3476 FLAG_SET_DEFAULT(UseSerialGC, true);
3477 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3478 UNSUPPORTED_GC_OPTION(UseG1GC);
3479 UNSUPPORTED_GC_OPTION(UseParallelGC);
3480 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3481 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3482 UNSUPPORTED_GC_OPTION(UseParNewGC);
3483 }
3484 #endif // INCLUDE_ALL_GCS
3485
3486 // Sharing support
3487 // Construct the path to the archive
3488 static char* get_shared_archive_path() {
3489 char *shared_archive_path;
3490 if (SharedArchiveFile == NULL) {
3491 char jvm_path[JVM_MAXPATHLEN];
3492 os::jvm_path(jvm_path, sizeof(jvm_path));
3493 char *end = strrchr(jvm_path, *os::file_separator());
3494 if (end != NULL) *end = '\0';
3495 size_t jvm_path_len = strlen(jvm_path);
3496 size_t file_sep_len = strlen(os::file_separator());
3497 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3498 file_sep_len + 20, mtInternal);
3499 if (shared_archive_path != NULL) {
3500 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3501 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3502 strncat(shared_archive_path, "classes.jsa", 11);
3503 }
3504 } else {
3505 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3506 if (shared_archive_path != NULL) {
3507 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3508 }
3509 }
3510 return shared_archive_path;
3511 }
3512
3513 #ifndef PRODUCT
3514 // Determine whether LogVMOutput should be implicitly turned on.
3515 static bool use_vm_log() {
3516 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3517 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3518 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3519 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3520 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3521 return true;
3522 }
3523
3524 #ifdef COMPILER1
3525 if (PrintC1Statistics) {
3526 return true;
3527 }
3528 #endif // COMPILER1
3529
3530 #ifdef COMPILER2
3531 if (PrintOptoAssembly || PrintOptoStatistics) {
3532 return true;
3533 }
3534 #endif // COMPILER2
3535
3536 return false;
3537 }
3538 #endif // PRODUCT
3539
3540 // Parse entry point called from JNI_CreateJavaVM
3541
3542 jint Arguments::parse(const JavaVMInitArgs* args) {
3543
3544 // Remaining part of option string
3545 const char* tail;
3546
3547 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3548 const char* hotspotrc = ".hotspotrc";
3549 bool settings_file_specified = false;
3550 bool needs_hotspotrc_warning = false;
3551
3552 const char* flags_file;
3553 int index;
3554 for (index = 0; index < args->nOptions; index++) {
3555 const JavaVMOption *option = args->options + index;
3556 if (match_option(option, "-XX:Flags=", &tail)) {
3557 flags_file = tail;
3558 settings_file_specified = true;
3559 }
3560 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3561 PrintVMOptions = true;
3562 }
3563 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3564 PrintVMOptions = false;
3565 }
3566 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3567 IgnoreUnrecognizedVMOptions = true;
3568 }
3569 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3570 IgnoreUnrecognizedVMOptions = false;
3571 }
3572 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3573 CommandLineFlags::printFlags(tty, false);
3574 vm_exit(0);
3575 }
3576 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3577 #if INCLUDE_NMT
3578 MemTracker::init_tracking_options(tail);
3579 #else
3580 jio_fprintf(defaultStream::error_stream(),
3581 "Native Memory Tracking is not supported in this VM\n");
3582 return JNI_ERR;
3583 #endif
3584 }
3585
3586
3587 #ifndef PRODUCT
3588 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3589 CommandLineFlags::printFlags(tty, true);
3590 vm_exit(0);
3591 }
3592 #endif
3593 }
3594
3595 if (IgnoreUnrecognizedVMOptions) {
3596 // uncast const to modify the flag args->ignoreUnrecognized
3597 *(jboolean*)(&args->ignoreUnrecognized) = true;
3598 }
3599
3600 // Parse specified settings file
3601 if (settings_file_specified) {
3602 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3603 return JNI_EINVAL;
3604 }
3605 } else {
3606 #ifdef ASSERT
3607 // Parse default .hotspotrc settings file
3608 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3609 return JNI_EINVAL;
3610 }
3611 #else
3612 struct stat buf;
3613 if (os::stat(hotspotrc, &buf) == 0) {
3614 needs_hotspotrc_warning = true;
3615 }
3616 #endif
3617 }
3618
3619 if (PrintVMOptions) {
3620 for (index = 0; index < args->nOptions; index++) {
3621 const JavaVMOption *option = args->options + index;
3622 if (match_option(option, "-XX:", &tail)) {
3623 logOption(tail);
3624 }
3625 }
3626 }
3627
3628 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3629 jint result = parse_vm_init_args(args);
3630 if (result != JNI_OK) {
3631 return result;
3632 }
3633
3634 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3635 SharedArchivePath = get_shared_archive_path();
3636 if (SharedArchivePath == NULL) {
3637 return JNI_ENOMEM;
3638 }
3639
3640 // Delay warning until here so that we've had a chance to process
3641 // the -XX:-PrintWarnings flag
3642 if (needs_hotspotrc_warning) {
3643 warning("%s file is present but has been ignored. "
3644 "Run with -XX:Flags=%s to load the file.",
3645 hotspotrc, hotspotrc);
3646 }
3647
3648 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3649 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3650 #endif
3651
3652 #if INCLUDE_ALL_GCS
3653 #if (defined JAVASE_EMBEDDED || defined ARM)
3654 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3655 #endif
3656 #endif
3657
3658 #ifndef PRODUCT
3659 if (TraceBytecodesAt != 0) {
3660 TraceBytecodes = true;
3661 }
3662 if (CountCompiledCalls) {
3663 if (UseCounterDecay) {
3664 warning("UseCounterDecay disabled because CountCalls is set");
3665 UseCounterDecay = false;
3666 }
3667 }
3668 #endif // PRODUCT
3669
3670 if (ScavengeRootsInCode == 0) {
3671 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3672 warning("forcing ScavengeRootsInCode non-zero");
3673 }
3674 ScavengeRootsInCode = 1;
3675 }
3676
3677 if (PrintGCDetails) {
3678 // Turn on -verbose:gc options as well
3679 PrintGC = true;
3680 }
3681
3682 if (!JDK_Version::is_gte_jdk18x_version()) {
3683 // To avoid changing the log format for 7 updates this flag is only
3684 // true by default in JDK8 and above.
3685 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3686 FLAG_SET_DEFAULT(PrintGCCause, false);
3687 }
3688 }
3689
3690 // Set object alignment values.
3691 set_object_alignment();
3692
3693 #if !INCLUDE_ALL_GCS
3694 force_serial_gc();
3695 #endif // INCLUDE_ALL_GCS
3696 #if !INCLUDE_CDS
3697 if (DumpSharedSpaces || RequireSharedSpaces) {
3698 jio_fprintf(defaultStream::error_stream(),
3699 "Shared spaces are not supported in this VM\n");
3700 return JNI_ERR;
3701 }
3702 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3703 warning("Shared spaces are not supported in this VM");
3704 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3705 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3706 }
3707 no_shared_spaces();
3708 #endif // INCLUDE_CDS
3709
3710 return JNI_OK;
3711 }
3712
3713 jint Arguments::apply_ergo() {
3714
3715 // Set flags based on ergonomics.
3716 set_ergonomics_flags();
3717
3718 set_shared_spaces_flags();
3719
3720 // Check the GC selections again.
3721 if (!check_gc_consistency()) {
3722 return JNI_EINVAL;
3723 }
3724
3725 if (TieredCompilation) {
3726 set_tiered_flags();
3727 } else {
3728 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3729 if (CompilationPolicyChoice >= 2) {
3730 vm_exit_during_initialization(
3731 "Incompatible compilation policy selected", NULL);
3732 }
3733 }
3734 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3735 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3736 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3737 }
3738
3739
3740 // Set heap size based on available physical memory
3741 set_heap_size();
3742
3743 #if INCLUDE_ALL_GCS
3744 // Set per-collector flags
3745 if (UseParallelGC || UseParallelOldGC) {
3746 set_parallel_gc_flags();
3747 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
3748 set_cms_and_parnew_gc_flags();
3749 } else if (UseParNewGC) { // Skipped if CMS is set above
3750 set_parnew_gc_flags();
3751 } else if (UseG1GC) {
3752 set_g1_gc_flags();
3753 }
3754 check_deprecated_gcs();
3755 check_deprecated_gc_flags();
3756 if (AssumeMP && !UseSerialGC) {
3757 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3758 warning("If the number of processors is expected to increase from one, then"
3759 " you should configure the number of parallel GC threads appropriately"
3760 " using -XX:ParallelGCThreads=N");
3761 }
3762 }
3763 if (MinHeapFreeRatio == 100) {
3764 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
3765 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
3766 }
3767 #else // INCLUDE_ALL_GCS
3768 assert(verify_serial_gc_flags(), "SerialGC unset");
3769 #endif // INCLUDE_ALL_GCS
3770
3771 // Initialize Metaspace flags and alignments
3772 Metaspace::ergo_initialize();
3773
3774 // Set bytecode rewriting flags
3775 set_bytecode_flags();
3776
3777 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3778 set_aggressive_opts_flags();
3779
3780 // Turn off biased locking for locking debug mode flags,
3781 // which are subtly different from each other but neither works with
3782 // biased locking
3783 if (UseHeavyMonitors
3784 #ifdef COMPILER1
3785 || !UseFastLocking
3786 #endif // COMPILER1
3787 ) {
3788 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3789 // flag set to true on command line; warn the user that they
3790 // can't enable biased locking here
3791 warning("Biased Locking is not supported with locking debug flags"
3792 "; ignoring UseBiasedLocking flag." );
3793 }
3794 UseBiasedLocking = false;
3795 }
3796
3797 #ifdef ZERO
3798 // Clear flags not supported on zero.
3799 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3800 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3801 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3802 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3803 #endif // CC_INTERP
3804
3805 #ifdef COMPILER2
3806 if (!EliminateLocks) {
3807 EliminateNestedLocks = false;
3808 }
3809 if (!Inline) {
3810 IncrementalInline = false;
3811 }
3812 #ifndef PRODUCT
3813 if (!IncrementalInline) {
3814 AlwaysIncrementalInline = false;
3815 }
3816 #endif
3817 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3818 // nothing to use the profiling, turn if off
3819 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3820 }
3821 if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) {
3822 // Doing the replace in parent maps helps speculation
3823 FLAG_SET_DEFAULT(ReplaceInParentMaps, true);
3824 }
3825 #endif
3826
3827 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3828 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3829 DebugNonSafepoints = true;
3830 }
3831
3832 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3833 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3834 }
3835
3836 #ifndef PRODUCT
3837 if (CompileTheWorld) {
3838 // Force NmethodSweeper to sweep whole CodeCache each time.
3839 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3840 NmethodSweepFraction = 1;
3841 }
3842 }
3843
3844 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3845 if (use_vm_log()) {
3846 LogVMOutput = true;
3847 }
3848 }
3849 #endif // PRODUCT
3850
3851 if (PrintCommandLineFlags) {
3852 CommandLineFlags::printSetFlags(tty);
3853 }
3854
3855 // Apply CPU specific policy for the BiasedLocking
3856 if (UseBiasedLocking) {
3857 if (!VM_Version::use_biased_locking() &&
3858 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3859 UseBiasedLocking = false;
3860 }
3861 }
3862 #ifdef COMPILER2
3863 if (!UseBiasedLocking || EmitSync != 0) {
3864 UseOptoBiasInlining = false;
3865 }
3866 #endif
3867
3868 return JNI_OK;
3869 }
3870
3871 jint Arguments::adjust_after_os() {
3872 if (UseNUMA) {
3873 if (UseParallelGC || UseParallelOldGC) {
3874 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3875 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3876 }
3877 }
3878 // UseNUMAInterleaving is set to ON for all collectors and
3879 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3880 // such as the parallel collector for Linux and Solaris will
3881 // interleave old gen and survivor spaces on top of NUMA
3882 // allocation policy for the eden space.
3883 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3884 // all platforms and ParallelGC on Windows will interleave all
3885 // of the heap spaces across NUMA nodes.
3886 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3887 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3888 }
3889 }
3890 return JNI_OK;
3891 }
3892
3893 int Arguments::PropertyList_count(SystemProperty* pl) {
3894 int count = 0;
3895 while(pl != NULL) {
3896 count++;
3897 pl = pl->next();
3898 }
3899 return count;
3900 }
3901
3902 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3903 assert(key != NULL, "just checking");
3904 SystemProperty* prop;
3905 for (prop = pl; prop != NULL; prop = prop->next()) {
3906 if (strcmp(key, prop->key()) == 0) return prop->value();
3907 }
3908 return NULL;
3909 }
3910
3911 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3912 int count = 0;
3913 const char* ret_val = NULL;
3914
3915 while(pl != NULL) {
3916 if(count >= index) {
3917 ret_val = pl->key();
3918 break;
3919 }
3920 count++;
3921 pl = pl->next();
3922 }
3923
3924 return ret_val;
3925 }
3926
3927 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3928 int count = 0;
3929 char* ret_val = NULL;
3930
3931 while(pl != NULL) {
3932 if(count >= index) {
3933 ret_val = pl->value();
3934 break;
3935 }
3936 count++;
3937 pl = pl->next();
3938 }
3939
3940 return ret_val;
3941 }
3942
3943 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3944 SystemProperty* p = *plist;
3945 if (p == NULL) {
3946 *plist = new_p;
3947 } else {
3948 while (p->next() != NULL) {
3949 p = p->next();
3950 }
3951 p->set_next(new_p);
3952 }
3953 }
3954
3955 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3956 if (plist == NULL)
3957 return;
3958
3959 SystemProperty* new_p = new SystemProperty(k, v, true);
3960 PropertyList_add(plist, new_p);
3961 }
3962
3963 // This add maintains unique property key in the list.
3964 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3965 if (plist == NULL)
3966 return;
3967
3968 // If property key exist then update with new value.
3969 SystemProperty* prop;
3970 for (prop = *plist; prop != NULL; prop = prop->next()) {
3971 if (strcmp(k, prop->key()) == 0) {
3972 if (append) {
3973 prop->append_value(v);
3974 } else {
3975 prop->set_value(v);
3976 }
3977 return;
3978 }
3979 }
3980
3981 PropertyList_add(plist, k, v);
3982 }
3983
3984 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3985 // Returns true if all of the source pointed by src has been copied over to
3986 // the destination buffer pointed by buf. Otherwise, returns false.
3987 // Notes:
3988 // 1. If the length (buflen) of the destination buffer excluding the
3989 // NULL terminator character is not long enough for holding the expanded
3990 // pid characters, it also returns false instead of returning the partially
3991 // expanded one.
3992 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3993 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3994 char* buf, size_t buflen) {
3995 const char* p = src;
3996 char* b = buf;
3997 const char* src_end = &src[srclen];
3998 char* buf_end = &buf[buflen - 1];
3999
4000 while (p < src_end && b < buf_end) {
4001 if (*p == '%') {
4002 switch (*(++p)) {
4003 case '%': // "%%" ==> "%"
4004 *b++ = *p++;
4005 break;
4006 case 'p': { // "%p" ==> current process id
4007 // buf_end points to the character before the last character so
4008 // that we could write '\0' to the end of the buffer.
4009 size_t buf_sz = buf_end - b + 1;
4010 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4011
4012 // if jio_snprintf fails or the buffer is not long enough to hold
4013 // the expanded pid, returns false.
4014 if (ret < 0 || ret >= (int)buf_sz) {
4015 return false;
4016 } else {
4017 b += ret;
4018 assert(*b == '\0', "fail in copy_expand_pid");
4019 if (p == src_end && b == buf_end + 1) {
4020 // reach the end of the buffer.
4021 return true;
4022 }
4023 }
4024 p++;
4025 break;
4026 }
4027 default :
4028 *b++ = '%';
4029 }
4030 } else {
4031 *b++ = *p++;
4032 }
4033 }
4034 *b = '\0';
4035 return (p == src_end); // return false if not all of the source was copied
4036 }