1 /*
2 * Copyright (c) 1997, 2017, 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/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "compiler/compilerOracle.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/cardTableRS.hpp"
32 #include "memory/genCollectedHeap.hpp"
33 #include "memory/referenceProcessor.hpp"
34 #include "memory/universe.inline.hpp"
35 #include "oops/oop.inline.hpp"
36 #include "prims/jvmtiExport.hpp"
37 #include "runtime/arguments.hpp"
38 #include "runtime/arguments_ext.hpp"
39 #include "runtime/globals_extension.hpp"
40 #include "runtime/java.hpp"
41 #include "services/management.hpp"
42 #include "services/memTracker.hpp"
43 #include "utilities/defaultStream.hpp"
44 #include "utilities/macros.hpp"
45 #include "utilities/stringUtils.hpp"
46 #include "utilities/taskqueue.hpp"
47 #ifdef TARGET_OS_FAMILY_linux
48 # include "os_linux.inline.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_solaris
51 # include "os_solaris.inline.hpp"
52 #endif
53 #ifdef TARGET_OS_FAMILY_windows
54 # include "os_windows.inline.hpp"
55 #endif
56 #ifdef TARGET_OS_FAMILY_aix
57 # include "os_aix.inline.hpp"
58 #endif
59 #ifdef TARGET_OS_FAMILY_bsd
60 # include "os_bsd.inline.hpp"
61 #endif
62 #if INCLUDE_ALL_GCS
63 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
64 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
65 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
66 #endif // INCLUDE_ALL_GCS
67
68 // Note: This is a special bug reporting site for the JVM
69 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
70 #define DEFAULT_JAVA_LAUNCHER "generic"
71
72 // Disable options not supported in this release, with a warning if they
73 // were explicitly requested on the command-line
74 #define UNSUPPORTED_OPTION(opt, description) \
75 do { \
76 if (opt) { \
77 if (FLAG_IS_CMDLINE(opt)) { \
78 warning(description " is disabled in this release."); \
79 } \
80 FLAG_SET_DEFAULT(opt, false); \
81 } \
82 } while(0)
83
84 #define UNSUPPORTED_GC_OPTION(gc) \
85 do { \
86 if (gc) { \
87 if (FLAG_IS_CMDLINE(gc)) { \
88 warning(#gc " is not supported in this VM. Using Serial GC."); \
89 } \
90 FLAG_SET_DEFAULT(gc, false); \
91 } \
92 } while(0)
93
94 char** Arguments::_jvm_flags_array = NULL;
95 int Arguments::_num_jvm_flags = 0;
96 char** Arguments::_jvm_args_array = NULL;
97 int Arguments::_num_jvm_args = 0;
98 char* Arguments::_java_command = NULL;
99 SystemProperty* Arguments::_system_properties = NULL;
100 const char* Arguments::_gc_log_filename = NULL;
101 bool Arguments::_has_profile = false;
102 size_t Arguments::_conservative_max_heap_alignment = 0;
103 uintx Arguments::_min_heap_size = 0;
104 uintx Arguments::_min_heap_free_ratio = 0;
105 uintx Arguments::_max_heap_free_ratio = 0;
106 Arguments::Mode Arguments::_mode = _mixed;
107 bool Arguments::_java_compiler = false;
108 bool Arguments::_xdebug_mode = false;
109 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
110 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
111 int Arguments::_sun_java_launcher_pid = -1;
112 bool Arguments::_created_by_gamma_launcher = false;
113
114 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
115 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
116 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
117 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
118 bool Arguments::_ClipInlining = ClipInlining;
119
120 char* Arguments::SharedArchivePath = NULL;
121
122 AgentLibraryList Arguments::_libraryList;
123 AgentLibraryList Arguments::_agentList;
124
125 abort_hook_t Arguments::_abort_hook = NULL;
126 exit_hook_t Arguments::_exit_hook = NULL;
127 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
128
129
130 SystemProperty *Arguments::_java_ext_dirs = NULL;
131 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
132 SystemProperty *Arguments::_sun_boot_library_path = NULL;
133 SystemProperty *Arguments::_java_library_path = NULL;
134 SystemProperty *Arguments::_java_home = NULL;
135 SystemProperty *Arguments::_java_class_path = NULL;
136 SystemProperty *Arguments::_sun_boot_class_path = NULL;
137
138 char* Arguments::_meta_index_path = NULL;
139 char* Arguments::_meta_index_dir = NULL;
140
141 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
142
143 static bool match_option(const JavaVMOption *option, const char* name,
144 const char** tail) {
145 int len = (int)strlen(name);
146 if (strncmp(option->optionString, name, len) == 0) {
147 *tail = option->optionString + len;
148 return true;
149 } else {
150 return false;
151 }
152 }
153
154 static void logOption(const char* opt) {
155 if (PrintVMOptions) {
156 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
157 }
158 }
159
160 // Process java launcher properties.
161 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
162 // See if sun.java.launcher or sun.java.launcher.pid is defined.
163 // Must do this before setting up other system properties,
164 // as some of them may depend on launcher type.
165 for (int index = 0; index < args->nOptions; index++) {
166 const JavaVMOption* option = args->options + index;
167 const char* tail;
168
169 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
170 process_java_launcher_argument(tail, option->extraInfo);
171 continue;
172 }
173 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
174 _sun_java_launcher_pid = atoi(tail);
175 continue;
176 }
177 }
178 }
179
180 // Initialize system properties key and value.
181 void Arguments::init_system_properties() {
182
183 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
184 "Java Virtual Machine Specification", false));
185 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
186 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
187 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
188
189 // following are JVMTI agent writeable properties.
190 // Properties values are set to NULL and they are
191 // os specific they are initialized in os::init_system_properties_values().
192 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
193 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
194 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
195 _java_library_path = new SystemProperty("java.library.path", NULL, true);
196 _java_home = new SystemProperty("java.home", NULL, true);
197 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
198
199 _java_class_path = new SystemProperty("java.class.path", "", true);
200
201 // Add to System Property list.
202 PropertyList_add(&_system_properties, _java_ext_dirs);
203 PropertyList_add(&_system_properties, _java_endorsed_dirs);
204 PropertyList_add(&_system_properties, _sun_boot_library_path);
205 PropertyList_add(&_system_properties, _java_library_path);
206 PropertyList_add(&_system_properties, _java_home);
207 PropertyList_add(&_system_properties, _java_class_path);
208 PropertyList_add(&_system_properties, _sun_boot_class_path);
209
210 // Set OS specific system properties values
211 os::init_system_properties_values();
212 }
213
214
215 // Update/Initialize System properties after JDK version number is known
216 void Arguments::init_version_specific_system_properties() {
217 enum { bufsz = 16 };
218 char buffer[bufsz];
219 const char* spec_vendor = "Sun Microsystems Inc.";
220 uint32_t spec_version = 0;
221
222 if (JDK_Version::is_gte_jdk17x_version()) {
223 spec_vendor = "Oracle Corporation";
224 spec_version = JDK_Version::current().major_version();
225 }
226 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
227
228 PropertyList_add(&_system_properties,
229 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
230 PropertyList_add(&_system_properties,
231 new SystemProperty("java.vm.specification.version", buffer, false));
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
234 }
235
236 /**
237 * Provide a slightly more user-friendly way of eliminating -XX flags.
238 * When a flag is eliminated, it can be added to this list in order to
239 * continue accepting this flag on the command-line, while issuing a warning
240 * and ignoring the value. Once the JDK version reaches the 'accept_until'
241 * limit, we flatly refuse to admit the existence of the flag. This allows
242 * a flag to die correctly over JDK releases using HSX.
243 */
244 typedef struct {
245 const char* name;
246 JDK_Version obsoleted_in; // when the flag went away
247 JDK_Version accept_until; // which version to start denying the existence
248 } ObsoleteFlag;
249
250 static ObsoleteFlag obsolete_jvm_flags[] = {
251 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
252 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
253 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
258 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
259 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
260 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
261 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
262 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
263 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
264 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
265 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
266 { "DefaultInitialRAMFraction",
267 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
268 { "UseDepthFirstScavengeOrder",
269 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
270 { "HandlePromotionFailure",
271 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
272 { "MaxLiveObjectEvacuationRatio",
273 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
274 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
275 { "UseParallelOldGCCompacting",
276 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
277 { "UseParallelDensePrefixUpdate",
278 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
279 { "UseParallelOldGCDensePrefix",
280 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
281 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
282 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
283 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
284 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
285 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
295 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
296 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
297 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
298 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
299 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
300 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
302 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
303 { "CompilationRepeat", JDK_Version::jdk(8), JDK_Version::jdk(9) },
304 #ifdef PRODUCT
305 { "DesiredMethodLimit",
306 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
307 #endif // PRODUCT
308 { NULL, JDK_Version(0), JDK_Version(0) }
309 };
310
311 // Returns true if the flag is obsolete and fits into the range specified
312 // for being ignored. In the case that the flag is ignored, the 'version'
313 // value is filled in with the version number when the flag became
314 // obsolete so that that value can be displayed to the user.
315 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
316 int i = 0;
317 assert(version != NULL, "Must provide a version buffer");
318 while (obsolete_jvm_flags[i].name != NULL) {
319 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
320 // <flag>=xxx form
321 // [-|+]<flag> form
322 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
323 ((s[0] == '+' || s[0] == '-') &&
324 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
325 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
326 *version = flag_status.obsoleted_in;
327 return true;
328 }
329 }
330 i++;
331 }
332 return false;
333 }
334
335 // Constructs the system class path (aka boot class path) from the following
336 // components, in order:
337 //
338 // prefix // from -Xbootclasspath/p:...
339 // endorsed // the expansion of -Djava.endorsed.dirs=...
340 // base // from os::get_system_properties() or -Xbootclasspath=
341 // suffix // from -Xbootclasspath/a:...
342 //
343 // java.endorsed.dirs is a list of directories; any jar or zip files in the
344 // directories are added to the sysclasspath just before the base.
345 //
346 // This could be AllStatic, but it isn't needed after argument processing is
347 // complete.
348 class SysClassPath: public StackObj {
349 public:
350 SysClassPath(const char* base);
351 ~SysClassPath();
352
353 inline void set_base(const char* base);
354 inline void add_prefix(const char* prefix);
355 inline void add_suffix_to_prefix(const char* suffix);
356 inline void add_suffix(const char* suffix);
357 inline void reset_path(const char* base);
358
359 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
360 // property. Must be called after all command-line arguments have been
361 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
362 // combined_path().
363 void expand_endorsed();
364
365 inline const char* get_base() const { return _items[_scp_base]; }
366 inline const char* get_prefix() const { return _items[_scp_prefix]; }
367 inline const char* get_suffix() const { return _items[_scp_suffix]; }
368 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
369
370 // Combine all the components into a single c-heap-allocated string; caller
371 // must free the string if/when no longer needed.
372 char* combined_path();
373
374 private:
375 // Utility routines.
376 static char* add_to_path(const char* path, const char* str, bool prepend);
377 static char* add_jars_to_path(char* path, const char* directory);
378
379 inline void reset_item_at(int index);
380
381 // Array indices for the items that make up the sysclasspath. All except the
382 // base are allocated in the C heap and freed by this class.
383 enum {
384 _scp_prefix, // from -Xbootclasspath/p:...
385 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
386 _scp_base, // the default sysclasspath
387 _scp_suffix, // from -Xbootclasspath/a:...
388 _scp_nitems // the number of items, must be last.
389 };
390
391 const char* _items[_scp_nitems];
392 DEBUG_ONLY(bool _expansion_done;)
393 };
394
395 SysClassPath::SysClassPath(const char* base) {
396 memset(_items, 0, sizeof(_items));
397 _items[_scp_base] = base;
398 DEBUG_ONLY(_expansion_done = false;)
399 }
400
401 SysClassPath::~SysClassPath() {
402 // Free everything except the base.
403 for (int i = 0; i < _scp_nitems; ++i) {
404 if (i != _scp_base) reset_item_at(i);
405 }
406 DEBUG_ONLY(_expansion_done = false;)
407 }
408
409 inline void SysClassPath::set_base(const char* base) {
410 _items[_scp_base] = base;
411 }
412
413 inline void SysClassPath::add_prefix(const char* prefix) {
414 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
415 }
416
417 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
418 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
419 }
420
421 inline void SysClassPath::add_suffix(const char* suffix) {
422 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
423 }
424
425 inline void SysClassPath::reset_item_at(int index) {
426 assert(index < _scp_nitems && index != _scp_base, "just checking");
427 if (_items[index] != NULL) {
428 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
429 _items[index] = NULL;
430 }
431 }
432
433 inline void SysClassPath::reset_path(const char* base) {
434 // Clear the prefix and suffix.
435 reset_item_at(_scp_prefix);
436 reset_item_at(_scp_suffix);
437 set_base(base);
438 }
439
440 //------------------------------------------------------------------------------
441
442 void SysClassPath::expand_endorsed() {
443 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
444
445 const char* path = Arguments::get_property("java.endorsed.dirs");
446 if (path == NULL) {
447 path = Arguments::get_endorsed_dir();
448 assert(path != NULL, "no default for java.endorsed.dirs");
449 }
450
451 char* expanded_path = NULL;
452 const char separator = *os::path_separator();
453 const char* const end = path + strlen(path);
454 while (path < end) {
455 const char* tmp_end = strchr(path, separator);
456 if (tmp_end == NULL) {
457 expanded_path = add_jars_to_path(expanded_path, path);
458 path = end;
459 } else {
460 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
461 memcpy(dirpath, path, tmp_end - path);
462 dirpath[tmp_end - path] = '\0';
463 expanded_path = add_jars_to_path(expanded_path, dirpath);
464 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
465 path = tmp_end + 1;
466 }
467 }
468 _items[_scp_endorsed] = expanded_path;
469 DEBUG_ONLY(_expansion_done = true;)
470 }
471
472 // Combine the bootclasspath elements, some of which may be null, into a single
473 // c-heap-allocated string.
474 char* SysClassPath::combined_path() {
475 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
476 assert(_expansion_done, "must call expand_endorsed() first.");
477
478 size_t lengths[_scp_nitems];
479 size_t total_len = 0;
480
481 const char separator = *os::path_separator();
482
483 // Get the lengths.
484 int i;
485 for (i = 0; i < _scp_nitems; ++i) {
486 if (_items[i] != NULL) {
487 lengths[i] = strlen(_items[i]);
488 // Include space for the separator char (or a NULL for the last item).
489 total_len += lengths[i] + 1;
490 }
491 }
492 assert(total_len > 0, "empty sysclasspath not allowed");
493
494 // Copy the _items to a single string.
495 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
496 char* cp_tmp = cp;
497 for (i = 0; i < _scp_nitems; ++i) {
498 if (_items[i] != NULL) {
499 memcpy(cp_tmp, _items[i], lengths[i]);
500 cp_tmp += lengths[i];
501 *cp_tmp++ = separator;
502 }
503 }
504 *--cp_tmp = '\0'; // Replace the extra separator.
505 return cp;
506 }
507
508 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
509 char*
510 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
511 char *cp;
512
513 assert(str != NULL, "just checking");
514 if (path == NULL) {
515 size_t len = strlen(str) + 1;
516 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
517 memcpy(cp, str, len); // copy the trailing null
518 } else {
519 const char separator = *os::path_separator();
520 size_t old_len = strlen(path);
521 size_t str_len = strlen(str);
522 size_t len = old_len + str_len + 2;
523
524 if (prepend) {
525 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
526 char* cp_tmp = cp;
527 memcpy(cp_tmp, str, str_len);
528 cp_tmp += str_len;
529 *cp_tmp = separator;
530 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
531 FREE_C_HEAP_ARRAY(char, path, mtInternal);
532 } else {
533 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
534 char* cp_tmp = cp + old_len;
535 *cp_tmp = separator;
536 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
537 }
538 }
539 return cp;
540 }
541
542 // Scan the directory and append any jar or zip files found to path.
543 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
544 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
545 DIR* dir = os::opendir(directory);
546 if (dir == NULL) return path;
547
548 char dir_sep[2] = { '\0', '\0' };
549 size_t directory_len = strlen(directory);
550 const char fileSep = *os::file_separator();
551 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
552
553 /* Scan the directory for jars/zips, appending them to path. */
554 struct dirent *entry;
555 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
556 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
557 const char* name = entry->d_name;
558 const char* ext = name + strlen(name) - 4;
559 bool isJarOrZip = ext > name &&
560 (os::file_name_strcmp(ext, ".jar") == 0 ||
561 os::file_name_strcmp(ext, ".zip") == 0);
562 if (isJarOrZip) {
563 size_t length = directory_len + 2 + strlen(name);
564 char* jarpath = NEW_C_HEAP_ARRAY(char, length, mtInternal);
565 jio_snprintf(jarpath, length, "%s%s%s", directory, dir_sep, name);
566 path = add_to_path(path, jarpath, false);
567 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
568 }
569 }
570 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
571 os::closedir(dir);
572 return path;
573 }
574
575 // Parses a memory size specification string.
576 static bool atomull(const char *s, julong* result) {
577 julong n = 0;
578 int args_read = sscanf(s, JULONG_FORMAT, &n);
579 if (args_read != 1) {
580 return false;
581 }
582 while (*s != '\0' && isdigit(*s)) {
583 s++;
584 }
585 // 4705540: illegal if more characters are found after the first non-digit
586 if (strlen(s) > 1) {
587 return false;
588 }
589 switch (*s) {
590 case 'T': case 't':
591 *result = n * G * K;
592 // Check for overflow.
593 if (*result/((julong)G * K) != n) return false;
594 return true;
595 case 'G': case 'g':
596 *result = n * G;
597 if (*result/G != n) return false;
598 return true;
599 case 'M': case 'm':
600 *result = n * M;
601 if (*result/M != n) return false;
602 return true;
603 case 'K': case 'k':
604 *result = n * K;
605 if (*result/K != n) return false;
606 return true;
607 case '\0':
608 *result = n;
609 return true;
610 default:
611 return false;
612 }
613 }
614
615 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
616 if (size < min_size) return arg_too_small;
617 // Check that size will fit in a size_t (only relevant on 32-bit)
618 if (size > max_uintx) return arg_too_big;
619 return arg_in_range;
620 }
621
622 // Describe an argument out of range error
623 void Arguments::describe_range_error(ArgsRange errcode) {
624 switch(errcode) {
625 case arg_too_big:
626 jio_fprintf(defaultStream::error_stream(),
627 "The specified size exceeds the maximum "
628 "representable size.\n");
629 break;
630 case arg_too_small:
631 case arg_unreadable:
632 case arg_in_range:
633 // do nothing for now
634 break;
635 default:
636 ShouldNotReachHere();
637 }
638 }
639
640 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
641 return CommandLineFlags::boolAtPut(name, &value, origin);
642 }
643
644 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
645 double v;
646 if (sscanf(value, "%lf", &v) != 1) {
647 return false;
648 }
649
650 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
651 return true;
652 }
653 return false;
654 }
655
656 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
657 julong v;
658 intx intx_v;
659 bool is_neg = false;
660 // Check the sign first since atomull() parses only unsigned values.
661 if (*value == '-') {
662 if (!CommandLineFlags::intxAt(name, &intx_v)) {
663 return false;
664 }
665 value++;
666 is_neg = true;
667 }
668 if (!atomull(value, &v)) {
669 return false;
670 }
671 intx_v = (intx) v;
672 if (is_neg) {
673 intx_v = -intx_v;
674 }
675 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
676 return true;
677 }
678 uintx uintx_v = (uintx) v;
679 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
680 return true;
681 }
682 uint64_t uint64_t_v = (uint64_t) v;
683 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
684 return true;
685 }
686 return false;
687 }
688
689 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
690 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
691 // Contract: CommandLineFlags always returns a pointer that needs freeing.
692 FREE_C_HEAP_ARRAY(char, value, mtInternal);
693 return true;
694 }
695
696 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
697 const char* old_value = "";
698 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
699 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
700 size_t new_len = strlen(new_value);
701 const char* value;
702 char* free_this_too = NULL;
703 if (old_len == 0) {
704 value = new_value;
705 } else if (new_len == 0) {
706 value = old_value;
707 } else {
708 size_t length = old_len + 1 + new_len + 1;
709 char* buf = NEW_C_HEAP_ARRAY(char, length, mtInternal);
710 // each new setting adds another LINE to the switch:
711 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
712 value = buf;
713 free_this_too = buf;
714 }
715 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
716 // CommandLineFlags always returns a pointer that needs freeing.
717 FREE_C_HEAP_ARRAY(char, value, mtInternal);
718 if (free_this_too != NULL) {
719 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
720 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
721 }
722 return true;
723 }
724
725 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
726
727 // range of acceptable characters spelled out for portability reasons
728 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
729 #define BUFLEN 255
730 char name[BUFLEN+1];
731 char dummy;
732
733 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
734 return set_bool_flag(name, false, origin);
735 }
736 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
737 return set_bool_flag(name, true, origin);
738 }
739
740 char punct;
741 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
742 const char* value = strchr(arg, '=') + 1;
743 Flag* flag = Flag::find_flag(name, strlen(name));
744 if (flag != NULL && flag->is_ccstr()) {
745 if (flag->ccstr_accumulates()) {
746 return append_to_string_flag(name, value, origin);
747 } else {
748 if (value[0] == '\0') {
749 value = NULL;
750 }
751 return set_string_flag(name, value, origin);
752 }
753 }
754 }
755
756 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
757 const char* value = strchr(arg, '=') + 1;
758 // -XX:Foo:=xxx will reset the string flag to the given value.
759 if (value[0] == '\0') {
760 value = NULL;
761 }
762 return set_string_flag(name, value, origin);
763 }
764
765 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
766 #define SIGNED_NUMBER_RANGE "[-0123456789]"
767 #define NUMBER_RANGE "[0123456789]"
768 char value[BUFLEN + 1];
769 char value2[BUFLEN + 1];
770 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
771 // Looks like a floating-point number -- try again with more lenient format string
772 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
773 return set_fp_numeric_flag(name, value, origin);
774 }
775 }
776
777 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
778 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
779 return set_numeric_flag(name, value, origin);
780 }
781
782 return false;
783 }
784
785 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
786 assert(bldarray != NULL, "illegal argument");
787
788 if (arg == NULL) {
789 return;
790 }
791
792 int new_count = *count + 1;
793
794 // expand the array and add arg to the last element
795 if (*bldarray == NULL) {
796 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
797 } else {
798 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
799 }
800 (*bldarray)[*count] = strdup(arg);
801 *count = new_count;
802 }
803
804 void Arguments::build_jvm_args(const char* arg) {
805 add_string(&_jvm_args_array, &_num_jvm_args, arg);
806 }
807
808 void Arguments::build_jvm_flags(const char* arg) {
809 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
810 }
811
812 // utility function to return a string that concatenates all
813 // strings in a given char** array
814 const char* Arguments::build_resource_string(char** args, int count) {
815 if (args == NULL || count == 0) {
816 return NULL;
817 }
818 size_t length = 0;
819 for (int i = 0; i < count; i++) {
820 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
821 }
822 char* s = NEW_RESOURCE_ARRAY(char, length);
823 char* dst = s;
824 for (int j = 0; j < count; j++) {
825 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
826 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
827 dst += offset;
828 length -= offset;
829 }
830 return (const char*) s;
831 }
832
833 void Arguments::print_on(outputStream* st) {
834 st->print_cr("VM Arguments:");
835 if (num_jvm_flags() > 0) {
836 st->print("jvm_flags: "); print_jvm_flags_on(st);
837 }
838 if (num_jvm_args() > 0) {
839 st->print("jvm_args: "); print_jvm_args_on(st);
840 }
841 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
842 if (_java_class_path != NULL) {
843 char* path = _java_class_path->value();
844 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
845 }
846 st->print_cr("Launcher Type: %s", _sun_java_launcher);
847 }
848
849 void Arguments::print_jvm_flags_on(outputStream* st) {
850 if (_num_jvm_flags > 0) {
851 for (int i=0; i < _num_jvm_flags; i++) {
852 st->print("%s ", _jvm_flags_array[i]);
853 }
854 st->cr();
855 }
856 }
857
858 void Arguments::print_jvm_args_on(outputStream* st) {
859 if (_num_jvm_args > 0) {
860 for (int i=0; i < _num_jvm_args; i++) {
861 st->print("%s ", _jvm_args_array[i]);
862 }
863 st->cr();
864 }
865 }
866
867 bool Arguments::process_argument(const char* arg,
868 jboolean ignore_unrecognized, Flag::Flags origin) {
869
870 JDK_Version since = JDK_Version();
871
872 if (parse_argument(arg, origin) || ignore_unrecognized) {
873 return true;
874 }
875
876 bool has_plus_minus = (*arg == '+' || *arg == '-');
877 const char* const argname = has_plus_minus ? arg + 1 : arg;
878 if (is_newly_obsolete(arg, &since)) {
879 char version[256];
880 since.to_string(version, sizeof(version));
881 warning("ignoring option %s; support was removed in %s", argname, version);
882 return true;
883 }
884
885 // For locked flags, report a custom error message if available.
886 // Otherwise, report the standard unrecognized VM option.
887
888 size_t arg_len;
889 const char* equal_sign = strchr(argname, '=');
890 if (equal_sign == NULL) {
891 arg_len = strlen(argname);
892 } else {
893 arg_len = equal_sign - argname;
894 }
895
896 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
897 if (found_flag != NULL) {
898 char locked_message_buf[BUFLEN];
899 found_flag->get_locked_message(locked_message_buf, BUFLEN);
900 if (strlen(locked_message_buf) == 0) {
901 if (found_flag->is_bool() && !has_plus_minus) {
902 jio_fprintf(defaultStream::error_stream(),
903 "Missing +/- setting for VM option '%s'\n", argname);
904 } else if (!found_flag->is_bool() && has_plus_minus) {
905 jio_fprintf(defaultStream::error_stream(),
906 "Unexpected +/- setting in VM option '%s'\n", argname);
907 } else {
908 jio_fprintf(defaultStream::error_stream(),
909 "Improperly specified VM option '%s'\n", argname);
910 }
911 } else {
912 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
913 }
914 } else {
915 jio_fprintf(defaultStream::error_stream(),
916 "Unrecognized VM option '%s'\n", argname);
917 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
918 if (fuzzy_matched != NULL) {
919 jio_fprintf(defaultStream::error_stream(),
920 "Did you mean '%s%s%s'?\n",
921 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
922 fuzzy_matched->_name,
923 (fuzzy_matched->is_bool()) ? "" : "=<value>");
924 }
925 }
926
927 // allow for commandline "commenting out" options like -XX:#+Verbose
928 return arg[0] == '#';
929 }
930
931 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
932 FILE* stream = fopen(file_name, "rb");
933 if (stream == NULL) {
934 if (should_exist) {
935 jio_fprintf(defaultStream::error_stream(),
936 "Could not open settings file %s\n", file_name);
937 return false;
938 } else {
939 return true;
940 }
941 }
942
943 char token[1024];
944 int pos = 0;
945
946 bool in_white_space = true;
947 bool in_comment = false;
948 bool in_quote = false;
949 char quote_c = 0;
950 bool result = true;
951
952 int c = getc(stream);
953 while(c != EOF && pos < (int)(sizeof(token)-1)) {
954 if (in_white_space) {
955 if (in_comment) {
956 if (c == '\n') in_comment = false;
957 } else {
958 if (c == '#') in_comment = true;
959 else if (!isspace(c)) {
960 in_white_space = false;
961 token[pos++] = c;
962 }
963 }
964 } else {
965 if (c == '\n' || (!in_quote && isspace(c))) {
966 // token ends at newline, or at unquoted whitespace
967 // this allows a way to include spaces in string-valued options
968 token[pos] = '\0';
969 logOption(token);
970 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
971 build_jvm_flags(token);
972 pos = 0;
973 in_white_space = true;
974 in_quote = false;
975 } else if (!in_quote && (c == '\'' || c == '"')) {
976 in_quote = true;
977 quote_c = c;
978 } else if (in_quote && (c == quote_c)) {
979 in_quote = false;
980 } else {
981 token[pos++] = c;
982 }
983 }
984 c = getc(stream);
985 }
986 if (pos > 0) {
987 token[pos] = '\0';
988 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
989 build_jvm_flags(token);
990 }
991 fclose(stream);
992 return result;
993 }
994
995 //=============================================================================================================
996 // Parsing of properties (-D)
997
998 const char* Arguments::get_property(const char* key) {
999 return PropertyList_get_value(system_properties(), key);
1000 }
1001
1002 bool Arguments::add_property(const char* prop) {
1003 const char* eq = strchr(prop, '=');
1004 char* key;
1005 // ns must be static--its address may be stored in a SystemProperty object.
1006 const static char ns[1] = {0};
1007 char* value = (char *)ns;
1008
1009 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1010 key = AllocateHeap(key_len + 1, mtInternal);
1011 strncpy(key, prop, key_len);
1012 key[key_len] = '\0';
1013
1014 if (eq != NULL) {
1015 size_t value_len = strlen(prop) - key_len - 1;
1016 value = AllocateHeap(value_len + 1, mtInternal);
1017 strncpy(value, &prop[key_len + 1], value_len + 1);
1018 }
1019
1020 if (strcmp(key, "java.compiler") == 0) {
1021 process_java_compiler_argument(value);
1022 FreeHeap(key);
1023 if (eq != NULL) {
1024 FreeHeap(value);
1025 }
1026 return true;
1027 } else if (strcmp(key, "sun.java.command") == 0) {
1028 _java_command = value;
1029
1030 // Record value in Arguments, but let it get passed to Java.
1031 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1032 // launcher.pid property is private and is processed
1033 // in process_sun_java_launcher_properties();
1034 // the sun.java.launcher property is passed on to the java application
1035 FreeHeap(key);
1036 if (eq != NULL) {
1037 FreeHeap(value);
1038 }
1039 return true;
1040 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1041 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1042 // its value without going through the property list or making a Java call.
1043 _java_vendor_url_bug = value;
1044 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1045 PropertyList_unique_add(&_system_properties, key, value, true);
1046 return true;
1047 }
1048 // Create new property and add at the end of the list
1049 PropertyList_unique_add(&_system_properties, key, value);
1050 return true;
1051 }
1052
1053 //===========================================================================================================
1054 // Setting int/mixed/comp mode flags
1055
1056 void Arguments::set_mode_flags(Mode mode) {
1057 // Set up default values for all flags.
1058 // If you add a flag to any of the branches below,
1059 // add a default value for it here.
1060 set_java_compiler(false);
1061 _mode = mode;
1062
1063 // Ensure Agent_OnLoad has the correct initial values.
1064 // This may not be the final mode; mode may change later in onload phase.
1065 PropertyList_unique_add(&_system_properties, "java.vm.info",
1066 (char*)VM_Version::vm_info_string(), false);
1067
1068 UseInterpreter = true;
1069 UseCompiler = true;
1070 UseLoopCounter = true;
1071
1072 #ifndef ZERO
1073 // Turn these off for mixed and comp. Leave them on for Zero.
1074 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1075 UseFastAccessorMethods = (mode == _int);
1076 }
1077 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1078 UseFastEmptyMethods = (mode == _int);
1079 }
1080 #endif
1081
1082 // Default values may be platform/compiler dependent -
1083 // use the saved values
1084 ClipInlining = Arguments::_ClipInlining;
1085 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1086 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1087 BackgroundCompilation = Arguments::_BackgroundCompilation;
1088
1089 // Change from defaults based on mode
1090 switch (mode) {
1091 default:
1092 ShouldNotReachHere();
1093 break;
1094 case _int:
1095 UseCompiler = false;
1096 UseLoopCounter = false;
1097 AlwaysCompileLoopMethods = false;
1098 UseOnStackReplacement = false;
1099 break;
1100 case _mixed:
1101 // same as default
1102 break;
1103 case _comp:
1104 UseInterpreter = false;
1105 BackgroundCompilation = false;
1106 ClipInlining = false;
1107 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1108 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1109 // compile a level 4 (C2) and then continue executing it.
1110 if (TieredCompilation) {
1111 Tier3InvokeNotifyFreqLog = 0;
1112 Tier4InvocationThreshold = 0;
1113 }
1114 break;
1115 }
1116 }
1117
1118 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1119 // Conflict: required to use shared spaces (-Xshare:on), but
1120 // incompatible command line options were chosen.
1121
1122 static void no_shared_spaces(const char* message) {
1123 if (RequireSharedSpaces) {
1124 jio_fprintf(defaultStream::error_stream(),
1125 "Class data sharing is inconsistent with other specified options.\n");
1126 vm_exit_during_initialization("Unable to use shared archive.", message);
1127 } else {
1128 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1129 }
1130 }
1131 #endif
1132
1133 void Arguments::set_tiered_flags() {
1134 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1135 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1136 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1137 }
1138 if (CompilationPolicyChoice < 2) {
1139 vm_exit_during_initialization(
1140 "Incompatible compilation policy selected", NULL);
1141 }
1142 // Increase the code cache size - tiered compiles a lot more.
1143 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1144 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1145 }
1146 if (!UseInterpreter) { // -Xcomp
1147 Tier3InvokeNotifyFreqLog = 0;
1148 Tier4InvocationThreshold = 0;
1149 }
1150 }
1151
1152 /**
1153 * Returns the minimum number of compiler threads needed to run the JVM. The following
1154 * configurations are possible.
1155 *
1156 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1157 * compiler threads is 0.
1158 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1159 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1160 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1161 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1162 * C1 can be used, so the minimum number of compiler threads is 1.
1163 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1164 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1165 * the minimum number of compiler threads is 2.
1166 */
1167 int Arguments::get_min_number_of_compiler_threads() {
1168 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1169 return 0; // case 1
1170 #else
1171 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1172 return 1; // case 2 or case 3
1173 }
1174 return 2; // case 4 (tiered)
1175 #endif
1176 }
1177
1178 #if INCLUDE_ALL_GCS
1179 static void disable_adaptive_size_policy(const char* collector_name) {
1180 if (UseAdaptiveSizePolicy) {
1181 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1182 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1183 collector_name);
1184 }
1185 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1186 }
1187 }
1188
1189 void Arguments::set_parnew_gc_flags() {
1190 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1191 "control point invariant");
1192 assert(UseParNewGC, "Error");
1193
1194 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1195 disable_adaptive_size_policy("UseParNewGC");
1196
1197 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1198 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1199 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1200 } else if (ParallelGCThreads == 0) {
1201 jio_fprintf(defaultStream::error_stream(),
1202 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1203 vm_exit(1);
1204 }
1205
1206 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1207 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1208 // we set them to 1024 and 1024.
1209 // See CR 6362902.
1210 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1211 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1212 }
1213 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1214 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1215 }
1216
1217 // AlwaysTenure flag should make ParNew promote all at first collection.
1218 // See CR 6362902.
1219 if (AlwaysTenure) {
1220 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1221 }
1222 // When using compressed oops, we use local overflow stacks,
1223 // rather than using a global overflow list chained through
1224 // the klass word of the object's pre-image.
1225 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1226 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1227 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1228 }
1229 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1230 }
1231 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1232 }
1233
1234 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1235 // sparc/solaris for certain applications, but would gain from
1236 // further optimization and tuning efforts, and would almost
1237 // certainly gain from analysis of platform and environment.
1238 void Arguments::set_cms_and_parnew_gc_flags() {
1239 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1240 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1241
1242 // If we are using CMS, we prefer to UseParNewGC,
1243 // unless explicitly forbidden.
1244 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1245 FLAG_SET_ERGO(bool, UseParNewGC, true);
1246 }
1247
1248 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1249 disable_adaptive_size_policy("UseConcMarkSweepGC");
1250
1251 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1252 // as needed.
1253 if (UseParNewGC) {
1254 set_parnew_gc_flags();
1255 }
1256
1257 size_t max_heap = align_size_down(MaxHeapSize,
1258 CardTableRS::ct_max_alignment_constraint());
1259
1260 // Now make adjustments for CMS
1261 intx tenuring_default = (intx)6;
1262 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1263
1264 // Preferred young gen size for "short" pauses:
1265 // upper bound depends on # of threads and NewRatio.
1266 const uintx parallel_gc_threads =
1267 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1268 const size_t preferred_max_new_size_unaligned =
1269 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1270 size_t preferred_max_new_size =
1271 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1272
1273 // Unless explicitly requested otherwise, size young gen
1274 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1275
1276 // If either MaxNewSize or NewRatio is set on the command line,
1277 // assume the user is trying to set the size of the young gen.
1278 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1279
1280 // Set MaxNewSize to our calculated preferred_max_new_size unless
1281 // NewSize was set on the command line and it is larger than
1282 // preferred_max_new_size.
1283 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1284 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1285 } else {
1286 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1287 }
1288 if (PrintGCDetails && Verbose) {
1289 // Too early to use gclog_or_tty
1290 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1291 }
1292
1293 // Code along this path potentially sets NewSize and OldSize
1294 if (PrintGCDetails && Verbose) {
1295 // Too early to use gclog_or_tty
1296 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1297 " initial_heap_size: " SIZE_FORMAT
1298 " max_heap: " SIZE_FORMAT,
1299 min_heap_size(), InitialHeapSize, max_heap);
1300 }
1301 size_t min_new = preferred_max_new_size;
1302 if (FLAG_IS_CMDLINE(NewSize)) {
1303 min_new = NewSize;
1304 }
1305 if (max_heap > min_new && min_heap_size() > min_new) {
1306 // Unless explicitly requested otherwise, make young gen
1307 // at least min_new, and at most preferred_max_new_size.
1308 if (FLAG_IS_DEFAULT(NewSize)) {
1309 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1310 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1311 if (PrintGCDetails && Verbose) {
1312 // Too early to use gclog_or_tty
1313 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1314 }
1315 }
1316 // Unless explicitly requested otherwise, size old gen
1317 // so it's NewRatio x of NewSize.
1318 if (FLAG_IS_DEFAULT(OldSize)) {
1319 if (max_heap > NewSize) {
1320 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1321 if (PrintGCDetails && Verbose) {
1322 // Too early to use gclog_or_tty
1323 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1324 }
1325 }
1326 }
1327 }
1328 }
1329 // Unless explicitly requested otherwise, definitely
1330 // promote all objects surviving "tenuring_default" scavenges.
1331 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1332 FLAG_IS_DEFAULT(SurvivorRatio)) {
1333 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1334 }
1335 // If we decided above (or user explicitly requested)
1336 // `promote all' (via MaxTenuringThreshold := 0),
1337 // prefer minuscule survivor spaces so as not to waste
1338 // space for (non-existent) survivors
1339 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1340 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1341 }
1342 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1343 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1344 // This is done in order to make ParNew+CMS configuration to work
1345 // with YoungPLABSize and OldPLABSize options.
1346 // See CR 6362902.
1347 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1348 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1349 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1350 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1351 // the value (either from the command line or ergonomics) of
1352 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1353 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1354 } else {
1355 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1356 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1357 // we'll let it to take precedence.
1358 jio_fprintf(defaultStream::error_stream(),
1359 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1360 " options are specified for the CMS collector."
1361 " CMSParPromoteBlocksToClaim will take precedence.\n");
1362 }
1363 }
1364 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1365 // OldPLAB sizing manually turned off: Use a larger default setting,
1366 // unless it was manually specified. This is because a too-low value
1367 // will slow down scavenges.
1368 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1369 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1370 }
1371 }
1372 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1373 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1374 // If either of the static initialization defaults have changed, note this
1375 // modification.
1376 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1377 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1378 }
1379
1380 if (!ClassUnloading) {
1381 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1382 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1383 }
1384
1385 if (PrintGCDetails && Verbose) {
1386 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1387 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1388 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1389 }
1390 }
1391 #endif // INCLUDE_ALL_GCS
1392
1393 void set_object_alignment() {
1394 // Object alignment.
1395 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1396 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1397 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1398 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1399 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1400 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1401
1402 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1403 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1404
1405 // Oop encoding heap max
1406 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1407
1408 #if INCLUDE_ALL_GCS
1409 // Set CMS global values
1410 CompactibleFreeListSpace::set_cms_values();
1411 #endif // INCLUDE_ALL_GCS
1412 }
1413
1414 bool verify_object_alignment() {
1415 // Object alignment.
1416 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1417 jio_fprintf(defaultStream::error_stream(),
1418 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1419 (int)ObjectAlignmentInBytes);
1420 return false;
1421 }
1422 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1423 jio_fprintf(defaultStream::error_stream(),
1424 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1425 (int)ObjectAlignmentInBytes, BytesPerLong);
1426 return false;
1427 }
1428 // It does not make sense to have big object alignment
1429 // since a space lost due to alignment will be greater
1430 // then a saved space from compressed oops.
1431 if ((int)ObjectAlignmentInBytes > 256) {
1432 jio_fprintf(defaultStream::error_stream(),
1433 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1434 (int)ObjectAlignmentInBytes);
1435 return false;
1436 }
1437 // In case page size is very small.
1438 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1439 jio_fprintf(defaultStream::error_stream(),
1440 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1441 (int)ObjectAlignmentInBytes, os::vm_page_size());
1442 return false;
1443 }
1444 if(SurvivorAlignmentInBytes == 0) {
1445 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1446 } else {
1447 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1448 jio_fprintf(defaultStream::error_stream(),
1449 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1450 (int)SurvivorAlignmentInBytes);
1451 return false;
1452 }
1453 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1454 jio_fprintf(defaultStream::error_stream(),
1455 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1456 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1457 return false;
1458 }
1459 }
1460 return true;
1461 }
1462
1463 size_t Arguments::max_heap_for_compressed_oops() {
1464 // Avoid sign flip.
1465 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1466 // We need to fit both the NULL page and the heap into the memory budget, while
1467 // keeping alignment constraints of the heap. To guarantee the latter, as the
1468 // NULL page is located before the heap, we pad the NULL page to the conservative
1469 // maximum alignment that the GC may ever impose upon the heap.
1470 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1471 _conservative_max_heap_alignment);
1472
1473 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1474 NOT_LP64(ShouldNotReachHere(); return 0);
1475 }
1476
1477 bool Arguments::should_auto_select_low_pause_collector() {
1478 if (UseAutoGCSelectPolicy &&
1479 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1480 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1481 if (PrintGCDetails) {
1482 // Cannot use gclog_or_tty yet.
1483 tty->print_cr("Automatic selection of the low pause collector"
1484 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1485 }
1486 return true;
1487 }
1488 return false;
1489 }
1490
1491 void Arguments::set_use_compressed_oops() {
1492 #ifndef ZERO
1493 #ifdef _LP64
1494 // MaxHeapSize is not set up properly at this point, but
1495 // the only value that can override MaxHeapSize if we are
1496 // to use UseCompressedOops is InitialHeapSize.
1497 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1498
1499 if (max_heap_size <= max_heap_for_compressed_oops()) {
1500 #if !defined(COMPILER1) || defined(TIERED)
1501 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1502 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1503 }
1504 #endif
1505 #ifdef _WIN64
1506 if (UseLargePages && UseCompressedOops) {
1507 // Cannot allocate guard pages for implicit checks in indexed addressing
1508 // mode, when large pages are specified on windows.
1509 // This flag could be switched ON if narrow oop base address is set to 0,
1510 // see code in Universe::initialize_heap().
1511 Universe::set_narrow_oop_use_implicit_null_checks(false);
1512 }
1513 #endif // _WIN64
1514 } else {
1515 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1516 warning("Max heap size too large for Compressed Oops");
1517 FLAG_SET_DEFAULT(UseCompressedOops, false);
1518 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1519 }
1520 }
1521 #endif // _LP64
1522 #endif // ZERO
1523 }
1524
1525
1526 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1527 // set_use_compressed_oops().
1528 void Arguments::set_use_compressed_klass_ptrs() {
1529 #ifndef ZERO
1530 #ifdef _LP64
1531 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1532 if (!UseCompressedOops) {
1533 if (UseCompressedClassPointers) {
1534 warning("UseCompressedClassPointers requires UseCompressedOops");
1535 }
1536 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1537 } else {
1538 // Turn on UseCompressedClassPointers too
1539 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1540 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1541 }
1542 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1543 if (UseCompressedClassPointers) {
1544 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1545 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1546 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1547 }
1548 }
1549 }
1550 #endif // _LP64
1551 #endif // !ZERO
1552 }
1553
1554 void Arguments::set_conservative_max_heap_alignment() {
1555 // The conservative maximum required alignment for the heap is the maximum of
1556 // the alignments imposed by several sources: any requirements from the heap
1557 // itself, the collector policy and the maximum page size we may run the VM
1558 // with.
1559 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1560 #if INCLUDE_ALL_GCS
1561 if (UseParallelGC) {
1562 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1563 } else if (UseG1GC) {
1564 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1565 }
1566 #endif // INCLUDE_ALL_GCS
1567 _conservative_max_heap_alignment = MAX4(heap_alignment,
1568 (size_t)os::vm_allocation_granularity(),
1569 os::max_page_size(),
1570 CollectorPolicy::compute_heap_alignment());
1571 }
1572
1573 void Arguments::select_gc_ergonomically() {
1574 if (os::is_server_class_machine()) {
1575 if (should_auto_select_low_pause_collector()) {
1576 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1577 } else {
1578 FLAG_SET_ERGO(bool, UseParallelGC, true);
1579 }
1580 }
1581 }
1582
1583 void Arguments::select_gc() {
1584 if (!gc_selected()) {
1585 select_gc_ergonomically();
1586 }
1587 }
1588
1589 void Arguments::set_ergonomics_flags() {
1590 select_gc();
1591
1592 #ifdef COMPILER2
1593 // Shared spaces work fine with other GCs but causes bytecode rewriting
1594 // to be disabled, which hurts interpreter performance and decreases
1595 // server performance. When -server is specified, keep the default off
1596 // unless it is asked for. Future work: either add bytecode rewriting
1597 // at link time, or rewrite bytecodes in non-shared methods.
1598 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1599 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1600 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1601 }
1602 #endif
1603
1604 set_conservative_max_heap_alignment();
1605
1606 #ifndef ZERO
1607 #ifdef _LP64
1608 set_use_compressed_oops();
1609
1610 // set_use_compressed_klass_ptrs() must be called after calling
1611 // set_use_compressed_oops().
1612 set_use_compressed_klass_ptrs();
1613
1614 // Also checks that certain machines are slower with compressed oops
1615 // in vm_version initialization code.
1616 #endif // _LP64
1617 #endif // !ZERO
1618 }
1619
1620 void Arguments::set_parallel_gc_flags() {
1621 assert(UseParallelGC || UseParallelOldGC, "Error");
1622 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1623 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1624 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1625 }
1626 FLAG_SET_DEFAULT(UseParallelGC, true);
1627
1628 // If no heap maximum was requested explicitly, use some reasonable fraction
1629 // of the physical memory, up to a maximum of 1GB.
1630 FLAG_SET_DEFAULT(ParallelGCThreads,
1631 Abstract_VM_Version::parallel_worker_threads());
1632 if (ParallelGCThreads == 0) {
1633 jio_fprintf(defaultStream::error_stream(),
1634 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1635 vm_exit(1);
1636 }
1637
1638 if (UseAdaptiveSizePolicy) {
1639 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1640 // unless the user actually sets these flags.
1641 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1642 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1643 _min_heap_free_ratio = MinHeapFreeRatio;
1644 }
1645 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1646 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1647 _max_heap_free_ratio = MaxHeapFreeRatio;
1648 }
1649 }
1650
1651 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1652 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1653 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1654 // See CR 6362902 for details.
1655 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1656 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1657 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1658 }
1659 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1660 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1661 }
1662 }
1663
1664 if (UseParallelOldGC) {
1665 // Par compact uses lower default values since they are treated as
1666 // minimums. These are different defaults because of the different
1667 // interpretation and are not ergonomically set.
1668 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1669 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1670 }
1671 }
1672 }
1673
1674 void Arguments::set_g1_gc_flags() {
1675 assert(UseG1GC, "Error");
1676 #ifdef COMPILER1
1677 FastTLABRefill = false;
1678 #endif
1679 FLAG_SET_DEFAULT(ParallelGCThreads,
1680 Abstract_VM_Version::parallel_worker_threads());
1681 if (ParallelGCThreads == 0) {
1682 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1683 }
1684
1685 #if INCLUDE_ALL_GCS
1686 if (G1ConcRefinementThreads == 0) {
1687 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1688 }
1689 #endif
1690
1691 // MarkStackSize will be set (if it hasn't been set by the user)
1692 // when concurrent marking is initialized.
1693 // Its value will be based upon the number of parallel marking threads.
1694 // But we do set the maximum mark stack size here.
1695 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1696 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1697 }
1698
1699 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1700 // In G1, we want the default GC overhead goal to be higher than
1701 // say in PS. So we set it here to 10%. Otherwise the heap might
1702 // be expanded more aggressively than we would like it to. In
1703 // fact, even 10% seems to not be high enough in some cases
1704 // (especially small GC stress tests that the main thing they do
1705 // is allocation). We might consider increase it further.
1706 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1707 }
1708
1709 if (PrintGCDetails && Verbose) {
1710 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1711 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1712 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1713 }
1714 }
1715
1716 #if !INCLUDE_ALL_GCS
1717 #ifdef ASSERT
1718 static bool verify_serial_gc_flags() {
1719 return (UseSerialGC &&
1720 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1721 UseParallelGC || UseParallelOldGC));
1722 }
1723 #endif // ASSERT
1724 #endif // INCLUDE_ALL_GCS
1725
1726 void Arguments::set_gc_specific_flags() {
1727 #if INCLUDE_ALL_GCS
1728 // Set per-collector flags
1729 if (UseParallelGC || UseParallelOldGC) {
1730 set_parallel_gc_flags();
1731 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1732 set_cms_and_parnew_gc_flags();
1733 } else if (UseParNewGC) { // Skipped if CMS is set above
1734 set_parnew_gc_flags();
1735 } else if (UseG1GC) {
1736 set_g1_gc_flags();
1737 }
1738 check_deprecated_gcs();
1739 check_deprecated_gc_flags();
1740 if (AssumeMP && !UseSerialGC) {
1741 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1742 warning("If the number of processors is expected to increase from one, then"
1743 " you should configure the number of parallel GC threads appropriately"
1744 " using -XX:ParallelGCThreads=N");
1745 }
1746 }
1747 if (MinHeapFreeRatio == 100) {
1748 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1749 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1750 }
1751 #else // INCLUDE_ALL_GCS
1752 assert(verify_serial_gc_flags(), "SerialGC unset");
1753 #endif // INCLUDE_ALL_GCS
1754 }
1755
1756 julong Arguments::limit_by_allocatable_memory(julong limit) {
1757 julong max_allocatable;
1758 julong result = limit;
1759 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1760 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1761 }
1762 return result;
1763 }
1764
1765 void Arguments::set_heap_size() {
1766 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1767 // Deprecated flag
1768 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1769 }
1770
1771 julong phys_mem =
1772 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1773 : (julong)MaxRAM;
1774
1775 // Experimental support for CGroup memory limits
1776 if (UseCGroupMemoryLimitForHeap) {
1777 // This is a rough indicator that a CGroup limit may be in force
1778 // for this process
1779 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1780 FILE *fp = fopen(lim_file, "r");
1781 if (fp != NULL) {
1782 julong cgroup_max = 0;
1783 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
1784 if (ret == 1 && cgroup_max > 0) {
1785 // If unlimited, cgroup_max will be a very large, but unspecified
1786 // value, so use initial phys_mem as a limit
1787 if (PrintGCDetails && Verbose) {
1788 // Cannot use gclog_or_tty yet.
1789 tty->print_cr("Setting phys_mem to the min of cgroup limit ("
1790 JULONG_FORMAT "MB) and initial phys_mem ("
1791 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
1792 }
1793 phys_mem = MIN2(cgroup_max, phys_mem);
1794 } else {
1795 warning("Unable to read/parse cgroup memory limit from %s: %s",
1796 lim_file, errno != 0 ? strerror(errno) : "unknown error");
1797 }
1798 fclose(fp);
1799 } else {
1800 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
1801 }
1802 }
1803
1804 // If the maximum heap size has not been set with -Xmx,
1805 // then set it as fraction of the size of physical memory,
1806 // respecting the maximum and minimum sizes of the heap.
1807 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1808 julong reasonable_max = phys_mem / MaxRAMFraction;
1809
1810 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1811 // Small physical memory, so use a minimum fraction of it for the heap
1812 reasonable_max = phys_mem / MinRAMFraction;
1813 } else {
1814 // Not-small physical memory, so require a heap at least
1815 // as large as MaxHeapSize
1816 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1817 }
1818 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1819 // Limit the heap size to ErgoHeapSizeLimit
1820 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1821 }
1822 if (UseCompressedOops) {
1823 // Limit the heap size to the maximum possible when using compressed oops
1824 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1825 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1826 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1827 // but it should be not less than default MaxHeapSize.
1828 max_coop_heap -= HeapBaseMinAddress;
1829 }
1830 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1831 }
1832 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1833
1834 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1835 // An initial heap size was specified on the command line,
1836 // so be sure that the maximum size is consistent. Done
1837 // after call to limit_by_allocatable_memory because that
1838 // method might reduce the allocation size.
1839 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1840 }
1841
1842 if (PrintGCDetails && Verbose) {
1843 // Cannot use gclog_or_tty yet.
1844 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1845 }
1846 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1847 }
1848
1849 // If the minimum or initial heap_size have not been set or requested to be set
1850 // ergonomically, set them accordingly.
1851 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1852 julong reasonable_minimum = (julong)(OldSize + NewSize);
1853
1854 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1855
1856 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1857
1858 if (InitialHeapSize == 0) {
1859 julong reasonable_initial = phys_mem / InitialRAMFraction;
1860
1861 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1862 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1863
1864 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1865
1866 if (PrintGCDetails && Verbose) {
1867 // Cannot use gclog_or_tty yet.
1868 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1869 }
1870 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1871 }
1872 // If the minimum heap size has not been set (via -Xms),
1873 // synchronize with InitialHeapSize to avoid errors with the default value.
1874 if (min_heap_size() == 0) {
1875 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1876 if (PrintGCDetails && Verbose) {
1877 // Cannot use gclog_or_tty yet.
1878 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1879 }
1880 }
1881 }
1882 }
1883
1884 // This must be called after ergonomics because we want bytecode rewriting
1885 // if the server compiler is used, or if UseSharedSpaces is disabled.
1886 void Arguments::set_bytecode_flags() {
1887 // Better not attempt to store into a read-only space.
1888 if (UseSharedSpaces) {
1889 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1890 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1891 }
1892
1893 if (!RewriteBytecodes) {
1894 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1895 }
1896 }
1897
1898 // Aggressive optimization flags -XX:+AggressiveOpts
1899 void Arguments::set_aggressive_opts_flags() {
1900 #ifdef COMPILER2
1901 if (AggressiveUnboxing) {
1902 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1903 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1904 } else if (!EliminateAutoBox) {
1905 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1906 AggressiveUnboxing = false;
1907 }
1908 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1909 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1910 } else if (!DoEscapeAnalysis) {
1911 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1912 AggressiveUnboxing = false;
1913 }
1914 }
1915 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1916 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1917 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1918 }
1919 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1920 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1921 }
1922
1923 // Feed the cache size setting into the JDK
1924 char buffer[1024];
1925 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1926 add_property(buffer);
1927 }
1928 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1929 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1930 }
1931 #endif
1932
1933 if (AggressiveOpts) {
1934 // Sample flag setting code
1935 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1936 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1937 // }
1938 }
1939 }
1940
1941 //===========================================================================================================
1942 // Parsing of java.compiler property
1943
1944 void Arguments::process_java_compiler_argument(char* arg) {
1945 // For backwards compatibility, Djava.compiler=NONE or ""
1946 // causes us to switch to -Xint mode UNLESS -Xdebug
1947 // is also specified.
1948 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1949 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1950 }
1951 }
1952
1953 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1954 _sun_java_launcher = strdup(launcher);
1955 if (strcmp("gamma", _sun_java_launcher) == 0) {
1956 _created_by_gamma_launcher = true;
1957 }
1958 }
1959
1960 bool Arguments::created_by_java_launcher() {
1961 assert(_sun_java_launcher != NULL, "property must have value");
1962 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1963 }
1964
1965 bool Arguments::created_by_gamma_launcher() {
1966 return _created_by_gamma_launcher;
1967 }
1968
1969 //===========================================================================================================
1970 // Parsing of main arguments
1971
1972 bool Arguments::verify_interval(uintx val, uintx min,
1973 uintx max, const char* name) {
1974 // Returns true iff value is in the inclusive interval [min..max]
1975 // false, otherwise.
1976 if (val >= min && val <= max) {
1977 return true;
1978 }
1979 jio_fprintf(defaultStream::error_stream(),
1980 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1981 " and " UINTX_FORMAT "\n",
1982 name, val, min, max);
1983 return false;
1984 }
1985
1986 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1987 // Returns true if given value is at least specified min threshold
1988 // false, otherwise.
1989 if (val >= min ) {
1990 return true;
1991 }
1992 jio_fprintf(defaultStream::error_stream(),
1993 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1994 name, val, min);
1995 return false;
1996 }
1997
1998 bool Arguments::verify_percentage(uintx value, const char* name) {
1999 if (is_percentage(value)) {
2000 return true;
2001 }
2002 jio_fprintf(defaultStream::error_stream(),
2003 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2004 name, value);
2005 return false;
2006 }
2007
2008 // check if do gclog rotation
2009 // +UseGCLogFileRotation is a must,
2010 // no gc log rotation when log file not supplied or
2011 // NumberOfGCLogFiles is 0
2012 void check_gclog_consistency() {
2013 if (UseGCLogFileRotation) {
2014 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2015 jio_fprintf(defaultStream::output_stream(),
2016 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2017 "where num_of_file > 0\n"
2018 "GC log rotation is turned off\n");
2019 UseGCLogFileRotation = false;
2020 }
2021 }
2022
2023 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2024 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2025 jio_fprintf(defaultStream::output_stream(),
2026 "GCLogFileSize changed to minimum 8K\n");
2027 }
2028 }
2029
2030 // This function is called for -Xloggc:<filename>, it can be used
2031 // to check if a given file name(or string) conforms to the following
2032 // specification:
2033 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2034 // %p and %t only allowed once. We only limit usage of filename not path
2035 bool is_filename_valid(const char *file_name) {
2036 const char* p = file_name;
2037 char file_sep = os::file_separator()[0];
2038 const char* cp;
2039 // skip prefix path
2040 for (cp = file_name; *cp != '\0'; cp++) {
2041 if (*cp == '/' || *cp == file_sep) {
2042 p = cp + 1;
2043 }
2044 }
2045
2046 int count_p = 0;
2047 int count_t = 0;
2048 while (*p != '\0') {
2049 if ((*p >= '0' && *p <= '9') ||
2050 (*p >= 'A' && *p <= 'Z') ||
2051 (*p >= 'a' && *p <= 'z') ||
2052 *p == '-' ||
2053 *p == '_' ||
2054 *p == '.') {
2055 p++;
2056 continue;
2057 }
2058 if (*p == '%') {
2059 if(*(p + 1) == 'p') {
2060 p += 2;
2061 count_p ++;
2062 continue;
2063 }
2064 if (*(p + 1) == 't') {
2065 p += 2;
2066 count_t ++;
2067 continue;
2068 }
2069 }
2070 return false;
2071 }
2072 return count_p < 2 && count_t < 2;
2073 }
2074
2075 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2076 if (!is_percentage(min_heap_free_ratio)) {
2077 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2078 return false;
2079 }
2080 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2081 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2082 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2083 MaxHeapFreeRatio);
2084 return false;
2085 }
2086 // This does not set the flag itself, but stores the value in a safe place for later usage.
2087 _min_heap_free_ratio = min_heap_free_ratio;
2088 return true;
2089 }
2090
2091 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2092 if (!is_percentage(max_heap_free_ratio)) {
2093 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2094 return false;
2095 }
2096 if (max_heap_free_ratio < MinHeapFreeRatio) {
2097 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2098 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2099 MinHeapFreeRatio);
2100 return false;
2101 }
2102 // This does not set the flag itself, but stores the value in a safe place for later usage.
2103 _max_heap_free_ratio = max_heap_free_ratio;
2104 return true;
2105 }
2106
2107 // Check consistency of GC selection
2108 bool Arguments::check_gc_consistency() {
2109 check_gclog_consistency();
2110 bool status = true;
2111 // Ensure that the user has not selected conflicting sets
2112 // of collectors. [Note: this check is merely a user convenience;
2113 // collectors over-ride each other so that only a non-conflicting
2114 // set is selected; however what the user gets is not what they
2115 // may have expected from the combination they asked for. It's
2116 // better to reduce user confusion by not allowing them to
2117 // select conflicting combinations.
2118 uint i = 0;
2119 if (UseSerialGC) i++;
2120 if (UseConcMarkSweepGC || UseParNewGC) i++;
2121 if (UseParallelGC || UseParallelOldGC) i++;
2122 if (UseG1GC) i++;
2123 if (i > 1) {
2124 jio_fprintf(defaultStream::error_stream(),
2125 "Conflicting collector combinations in option list; "
2126 "please refer to the release notes for the combinations "
2127 "allowed\n");
2128 status = false;
2129 }
2130 return status;
2131 }
2132
2133 void Arguments::check_deprecated_gcs() {
2134 if (UseConcMarkSweepGC && !UseParNewGC) {
2135 warning("Using the DefNew young collector with the CMS collector is deprecated "
2136 "and will likely be removed in a future release");
2137 }
2138
2139 if (UseParNewGC && !UseConcMarkSweepGC) {
2140 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2141 // set up UseSerialGC properly, so that can't be used in the check here.
2142 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2143 "and will likely be removed in a future release");
2144 }
2145
2146 if (CMSIncrementalMode) {
2147 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2148 }
2149 }
2150
2151 void Arguments::check_deprecated_gc_flags() {
2152 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2153 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2154 "and will likely be removed in future release");
2155 }
2156 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2157 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2158 "Use MaxRAMFraction instead.");
2159 }
2160 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2161 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2162 }
2163 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2164 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2165 }
2166 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2167 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2168 }
2169 }
2170
2171 // Check stack pages settings
2172 bool Arguments::check_stack_pages()
2173 {
2174 bool status = true;
2175 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2176 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2177 // greater stack shadow pages can't generate instruction to bang stack
2178 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2179 return status;
2180 }
2181
2182 // Check the consistency of vm_init_args
2183 bool Arguments::check_vm_args_consistency() {
2184 // Method for adding checks for flag consistency.
2185 // The intent is to warn the user of all possible conflicts,
2186 // before returning an error.
2187 // Note: Needs platform-dependent factoring.
2188 bool status = true;
2189
2190 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2191 // builds so the cost of stack banging can be measured.
2192 #if (defined(PRODUCT) && defined(SOLARIS))
2193 if (!UseBoundThreads && !UseStackBanging) {
2194 jio_fprintf(defaultStream::error_stream(),
2195 "-UseStackBanging conflicts with -UseBoundThreads\n");
2196
2197 status = false;
2198 }
2199 #endif
2200
2201 if (TLABRefillWasteFraction == 0) {
2202 jio_fprintf(defaultStream::error_stream(),
2203 "TLABRefillWasteFraction should be a denominator, "
2204 "not " SIZE_FORMAT "\n",
2205 TLABRefillWasteFraction);
2206 status = false;
2207 }
2208
2209 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2210 "AdaptiveSizePolicyWeight");
2211 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2212
2213 // Divide by bucket size to prevent a large size from causing rollover when
2214 // calculating amount of memory needed to be allocated for the String table.
2215 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2216 (max_uintx / StringTable::bucket_size()), "StringTable size");
2217
2218 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2219 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2220
2221 {
2222 // Using "else if" below to avoid printing two error messages if min > max.
2223 // This will also prevent us from reporting both min>100 and max>100 at the
2224 // same time, but that is less annoying than printing two identical errors IMHO.
2225 FormatBuffer<80> err_msg("%s","");
2226 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2227 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2228 status = false;
2229 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2230 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2231 status = false;
2232 }
2233 }
2234
2235 // Min/MaxMetaspaceFreeRatio
2236 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2237 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2238
2239 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2240 jio_fprintf(defaultStream::error_stream(),
2241 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2242 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2243 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2244 MinMetaspaceFreeRatio,
2245 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2246 MaxMetaspaceFreeRatio);
2247 status = false;
2248 }
2249
2250 // Trying to keep 100% free is not practical
2251 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2252
2253 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2254 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2255 }
2256
2257 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2258 // Settings to encourage splitting.
2259 if (!FLAG_IS_CMDLINE(NewRatio)) {
2260 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2261 }
2262 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2263 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2264 }
2265 }
2266
2267 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2268 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2269 if (GCTimeLimit == 100) {
2270 // Turn off gc-overhead-limit-exceeded checks
2271 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2272 }
2273
2274 status = status && check_gc_consistency();
2275 status = status && check_stack_pages();
2276
2277 if (CMSIncrementalMode) {
2278 if (!UseConcMarkSweepGC) {
2279 jio_fprintf(defaultStream::error_stream(),
2280 "error: invalid argument combination.\n"
2281 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2282 "selected in order\nto use CMSIncrementalMode.\n");
2283 status = false;
2284 } else {
2285 status = status && verify_percentage(CMSIncrementalDutyCycle,
2286 "CMSIncrementalDutyCycle");
2287 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2288 "CMSIncrementalDutyCycleMin");
2289 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2290 "CMSIncrementalSafetyFactor");
2291 status = status && verify_percentage(CMSIncrementalOffset,
2292 "CMSIncrementalOffset");
2293 status = status && verify_percentage(CMSExpAvgFactor,
2294 "CMSExpAvgFactor");
2295 // If it was not set on the command line, set
2296 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2297 if (CMSInitiatingOccupancyFraction < 0) {
2298 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2299 }
2300 }
2301 }
2302
2303 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2304 // insists that we hold the requisite locks so that the iteration is
2305 // MT-safe. For the verification at start-up and shut-down, we don't
2306 // yet have a good way of acquiring and releasing these locks,
2307 // which are not visible at the CollectedHeap level. We want to
2308 // be able to acquire these locks and then do the iteration rather
2309 // than just disable the lock verification. This will be fixed under
2310 // bug 4788986.
2311 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2312 if (VerifyDuringStartup) {
2313 warning("Heap verification at start-up disabled "
2314 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2315 VerifyDuringStartup = false; // Disable verification at start-up
2316 }
2317
2318 if (VerifyBeforeExit) {
2319 warning("Heap verification at shutdown disabled "
2320 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2321 VerifyBeforeExit = false; // Disable verification at shutdown
2322 }
2323 }
2324
2325 // Note: only executed in non-PRODUCT mode
2326 if (!UseAsyncConcMarkSweepGC &&
2327 (ExplicitGCInvokesConcurrent ||
2328 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2329 jio_fprintf(defaultStream::error_stream(),
2330 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2331 " with -UseAsyncConcMarkSweepGC");
2332 status = false;
2333 }
2334
2335 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2336
2337 #if INCLUDE_ALL_GCS
2338 if (UseG1GC) {
2339 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2340 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2341 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2342
2343 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2344 "InitiatingHeapOccupancyPercent");
2345 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2346 "G1RefProcDrainInterval");
2347 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2348 "G1ConcMarkStepDurationMillis");
2349 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2350 "G1ConcRSHotCardLimit");
2351 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2352 "G1ConcRSLogCacheSize");
2353 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2354 "StringDeduplicationAgeThreshold");
2355 }
2356 if (UseConcMarkSweepGC) {
2357 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2358 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2359 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2360 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2361
2362 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2363
2364 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2365 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2366 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2367
2368 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2369
2370 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2371 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2372
2373 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2374 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2375 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2376
2377 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2378
2379 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2380
2381 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2382 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2383 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2384 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2385 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2386 }
2387
2388 if (UseParallelGC || UseParallelOldGC) {
2389 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2390 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2391
2392 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2393 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2394
2395 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2396 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2397
2398 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2399
2400 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2401 }
2402 #endif // INCLUDE_ALL_GCS
2403
2404 status = status && verify_interval(RefDiscoveryPolicy,
2405 ReferenceProcessor::DiscoveryPolicyMin,
2406 ReferenceProcessor::DiscoveryPolicyMax,
2407 "RefDiscoveryPolicy");
2408
2409 // Limit the lower bound of this flag to 1 as it is used in a division
2410 // expression.
2411 status = status && verify_interval(TLABWasteTargetPercent,
2412 1, 100, "TLABWasteTargetPercent");
2413
2414 status = status && verify_object_alignment();
2415
2416 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2417 "CompressedClassSpaceSize");
2418
2419 status = status && verify_interval(MarkStackSizeMax,
2420 1, (max_jint - 1), "MarkStackSizeMax");
2421 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2422
2423 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2424
2425 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2426
2427 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2428
2429 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2430 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2431
2432 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2433
2434 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2435 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2436 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2437 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2438
2439 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2440 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2441
2442 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2443 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2444 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2445
2446 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2447 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2448
2449 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2450 // just for that, so hardcode here.
2451 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2452 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2453 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2454 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2455
2456 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2457 #ifdef COMPILER1
2458 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2459 #endif
2460
2461 if (PrintNMTStatistics) {
2462 #if INCLUDE_NMT
2463 if (MemTracker::tracking_level() == NMT_off) {
2464 #endif // INCLUDE_NMT
2465 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2466 PrintNMTStatistics = false;
2467 #if INCLUDE_NMT
2468 }
2469 #endif
2470 }
2471
2472 // Need to limit the extent of the padding to reasonable size.
2473 // 8K is well beyond the reasonable HW cache line size, even with the
2474 // aggressive prefetching, while still leaving the room for segregating
2475 // among the distinct pages.
2476 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2477 jio_fprintf(defaultStream::error_stream(),
2478 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2479 ContendedPaddingWidth, 0, 8192);
2480 status = false;
2481 }
2482
2483 // Need to enforce the padding not to break the existing field alignments.
2484 // It is sufficient to check against the largest type size.
2485 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2486 jio_fprintf(defaultStream::error_stream(),
2487 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2488 ContendedPaddingWidth, BytesPerLong);
2489 status = false;
2490 }
2491
2492 // Check lower bounds of the code cache
2493 // Template Interpreter code is approximately 3X larger in debug builds.
2494 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2495 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2496 jio_fprintf(defaultStream::error_stream(),
2497 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2498 os::vm_page_size()/K);
2499 status = false;
2500 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2501 jio_fprintf(defaultStream::error_stream(),
2502 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2503 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2504 status = false;
2505 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2506 jio_fprintf(defaultStream::error_stream(),
2507 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2508 min_code_cache_size/K);
2509 status = false;
2510 } else if (ReservedCodeCacheSize > 2*G) {
2511 // Code cache size larger than MAXINT is not supported.
2512 jio_fprintf(defaultStream::error_stream(),
2513 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2514 (2*G)/M);
2515 status = false;
2516 }
2517
2518 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2519 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2520
2521 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2522 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2523 }
2524
2525 #ifdef COMPILER1
2526 status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
2527 #endif
2528
2529 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2530 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2531 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2532 // Check the minimum number of compiler threads
2533 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2534
2535 return status;
2536 }
2537
2538 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2539 const char* option_type) {
2540 if (ignore) return false;
2541
2542 const char* spacer = " ";
2543 if (option_type == NULL) {
2544 option_type = ++spacer; // Set both to the empty string.
2545 }
2546
2547 if (os::obsolete_option(option)) {
2548 jio_fprintf(defaultStream::error_stream(),
2549 "Obsolete %s%soption: %s\n", option_type, spacer,
2550 option->optionString);
2551 return false;
2552 } else {
2553 jio_fprintf(defaultStream::error_stream(),
2554 "Unrecognized %s%soption: %s\n", option_type, spacer,
2555 option->optionString);
2556 return true;
2557 }
2558 }
2559
2560 static const char* user_assertion_options[] = {
2561 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2562 };
2563
2564 static const char* system_assertion_options[] = {
2565 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2566 };
2567
2568 // Return true if any of the strings in null-terminated array 'names' matches.
2569 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2570 // the option must match exactly.
2571 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2572 bool tail_allowed) {
2573 for (/* empty */; *names != NULL; ++names) {
2574 if (match_option(option, *names, tail)) {
2575 if (**tail == '\0' || tail_allowed && **tail == ':') {
2576 return true;
2577 }
2578 }
2579 }
2580 return false;
2581 }
2582
2583 bool Arguments::parse_uintx(const char* value,
2584 uintx* uintx_arg,
2585 uintx min_size) {
2586
2587 // Check the sign first since atomull() parses only unsigned values.
2588 bool value_is_positive = !(*value == '-');
2589
2590 if (value_is_positive) {
2591 julong n;
2592 bool good_return = atomull(value, &n);
2593 if (good_return) {
2594 bool above_minimum = n >= min_size;
2595 bool value_is_too_large = n > max_uintx;
2596
2597 if (above_minimum && !value_is_too_large) {
2598 *uintx_arg = n;
2599 return true;
2600 }
2601 }
2602 }
2603 return false;
2604 }
2605
2606 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2607 julong* long_arg,
2608 julong min_size) {
2609 if (!atomull(s, long_arg)) return arg_unreadable;
2610 return check_memory_size(*long_arg, min_size);
2611 }
2612
2613 // Parse JavaVMInitArgs structure
2614
2615 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2616 // For components of the system classpath.
2617 SysClassPath scp(Arguments::get_sysclasspath());
2618 bool scp_assembly_required = false;
2619
2620 // Save default settings for some mode flags
2621 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2622 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2623 Arguments::_ClipInlining = ClipInlining;
2624 Arguments::_BackgroundCompilation = BackgroundCompilation;
2625
2626 // Setup flags for mixed which is the default
2627 set_mode_flags(_mixed);
2628
2629 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2630 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2631 if (result != JNI_OK) {
2632 return result;
2633 }
2634
2635 // Parse JavaVMInitArgs structure passed in
2636 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2637 if (result != JNI_OK) {
2638 return result;
2639 }
2640
2641 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2642 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2643 if (result != JNI_OK) {
2644 return result;
2645 }
2646
2647 // Do final processing now that all arguments have been parsed
2648 result = finalize_vm_init_args(&scp, scp_assembly_required);
2649 if (result != JNI_OK) {
2650 return result;
2651 }
2652
2653 return JNI_OK;
2654 }
2655
2656 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2657 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2658 // are dealing with -agentpath (case where name is a path), otherwise with
2659 // -agentlib
2660 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2661 char *_name;
2662 const char *_hprof = "hprof", *_jdwp = "jdwp";
2663 size_t _len_hprof, _len_jdwp, _len_prefix;
2664
2665 if (is_path) {
2666 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2667 return false;
2668 }
2669
2670 _name++; // skip past last path separator
2671 _len_prefix = strlen(JNI_LIB_PREFIX);
2672
2673 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2674 return false;
2675 }
2676
2677 _name += _len_prefix;
2678 _len_hprof = strlen(_hprof);
2679 _len_jdwp = strlen(_jdwp);
2680
2681 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2682 _name += _len_hprof;
2683 }
2684 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2685 _name += _len_jdwp;
2686 }
2687 else {
2688 return false;
2689 }
2690
2691 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2692 return false;
2693 }
2694
2695 return true;
2696 }
2697
2698 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2699 return true;
2700 }
2701
2702 return false;
2703 }
2704
2705 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2706 SysClassPath* scp_p,
2707 bool* scp_assembly_required_p,
2708 Flag::Flags origin) {
2709 // Remaining part of option string
2710 const char* tail;
2711
2712 // iterate over arguments
2713 for (int index = 0; index < args->nOptions; index++) {
2714 bool is_absolute_path = false; // for -agentpath vs -agentlib
2715
2716 const JavaVMOption* option = args->options + index;
2717
2718 if (!match_option(option, "-Djava.class.path", &tail) &&
2719 !match_option(option, "-Dsun.java.command", &tail) &&
2720 !match_option(option, "-Dsun.java.launcher", &tail)) {
2721
2722 // add all jvm options to the jvm_args string. This string
2723 // is used later to set the java.vm.args PerfData string constant.
2724 // the -Djava.class.path and the -Dsun.java.command options are
2725 // omitted from jvm_args string as each have their own PerfData
2726 // string constant object.
2727 build_jvm_args(option->optionString);
2728 }
2729
2730 // -verbose:[class/gc/jni]
2731 if (match_option(option, "-verbose", &tail)) {
2732 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2733 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2734 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2735 } else if (!strcmp(tail, ":gc")) {
2736 FLAG_SET_CMDLINE(bool, PrintGC, true);
2737 } else if (!strcmp(tail, ":jni")) {
2738 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2739 }
2740 // -da / -ea / -disableassertions / -enableassertions
2741 // These accept an optional class/package name separated by a colon, e.g.,
2742 // -da:java.lang.Thread.
2743 } else if (match_option(option, user_assertion_options, &tail, true)) {
2744 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2745 if (*tail == '\0') {
2746 JavaAssertions::setUserClassDefault(enable);
2747 } else {
2748 assert(*tail == ':', "bogus match by match_option()");
2749 JavaAssertions::addOption(tail + 1, enable);
2750 }
2751 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2752 } else if (match_option(option, system_assertion_options, &tail, false)) {
2753 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2754 JavaAssertions::setSystemClassDefault(enable);
2755 // -bootclasspath:
2756 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2757 scp_p->reset_path(tail);
2758 *scp_assembly_required_p = true;
2759 // -bootclasspath/a:
2760 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2761 scp_p->add_suffix(tail);
2762 *scp_assembly_required_p = true;
2763 // -bootclasspath/p:
2764 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2765 scp_p->add_prefix(tail);
2766 *scp_assembly_required_p = true;
2767 // -Xrun
2768 } else if (match_option(option, "-Xrun", &tail)) {
2769 if (tail != NULL) {
2770 const char* pos = strchr(tail, ':');
2771 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2772 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2773 name[len] = '\0';
2774
2775 char *options = NULL;
2776 if(pos != NULL) {
2777 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2778 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2779 }
2780 #if !INCLUDE_JVMTI
2781 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2782 jio_fprintf(defaultStream::error_stream(),
2783 "Profiling and debugging agents are not supported in this VM\n");
2784 return JNI_ERR;
2785 }
2786 #endif // !INCLUDE_JVMTI
2787 add_init_library(name, options);
2788 }
2789 // -agentlib and -agentpath
2790 } else if (match_option(option, "-agentlib:", &tail) ||
2791 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2792 if(tail != NULL) {
2793 const char* pos = strchr(tail, '=');
2794 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2795 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2796 name[len] = '\0';
2797
2798 char *options = NULL;
2799 if(pos != NULL) {
2800 size_t length = strlen(pos + 1) + 1;
2801 options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2802 jio_snprintf(options, length, "%s", pos + 1);
2803 }
2804 #if !INCLUDE_JVMTI
2805 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2806 jio_fprintf(defaultStream::error_stream(),
2807 "Profiling and debugging agents are not supported in this VM\n");
2808 return JNI_ERR;
2809 }
2810 #endif // !INCLUDE_JVMTI
2811 add_init_agent(name, options, is_absolute_path);
2812 }
2813 // -javaagent
2814 } else if (match_option(option, "-javaagent:", &tail)) {
2815 #if !INCLUDE_JVMTI
2816 jio_fprintf(defaultStream::error_stream(),
2817 "Instrumentation agents are not supported in this VM\n");
2818 return JNI_ERR;
2819 #else
2820 if(tail != NULL) {
2821 size_t length = strlen(tail) + 1;
2822 char *options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2823 jio_snprintf(options, length, "%s", tail);
2824 add_init_agent("instrument", options, false);
2825 }
2826 #endif // !INCLUDE_JVMTI
2827 // -Xnoclassgc
2828 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2829 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2830 // -Xincgc: i-CMS
2831 } else if (match_option(option, "-Xincgc", &tail)) {
2832 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2833 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2834 // -Xnoincgc: no i-CMS
2835 } else if (match_option(option, "-Xnoincgc", &tail)) {
2836 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2837 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2838 // -Xconcgc
2839 } else if (match_option(option, "-Xconcgc", &tail)) {
2840 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2841 // -Xnoconcgc
2842 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2843 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2844 // -Xbatch
2845 } else if (match_option(option, "-Xbatch", &tail)) {
2846 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2847 // -Xmn for compatibility with other JVM vendors
2848 } else if (match_option(option, "-Xmn", &tail)) {
2849 julong long_initial_young_size = 0;
2850 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2851 if (errcode != arg_in_range) {
2852 jio_fprintf(defaultStream::error_stream(),
2853 "Invalid initial young generation size: %s\n", option->optionString);
2854 describe_range_error(errcode);
2855 return JNI_EINVAL;
2856 }
2857 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2858 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2859 // -Xms
2860 } else if (match_option(option, "-Xms", &tail)) {
2861 julong long_initial_heap_size = 0;
2862 // an initial heap size of 0 means automatically determine
2863 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2864 if (errcode != arg_in_range) {
2865 jio_fprintf(defaultStream::error_stream(),
2866 "Invalid initial heap size: %s\n", option->optionString);
2867 describe_range_error(errcode);
2868 return JNI_EINVAL;
2869 }
2870 set_min_heap_size((uintx)long_initial_heap_size);
2871 // Currently the minimum size and the initial heap sizes are the same.
2872 // Can be overridden with -XX:InitialHeapSize.
2873 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2874 // -Xmx
2875 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2876 julong long_max_heap_size = 0;
2877 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2878 if (errcode != arg_in_range) {
2879 jio_fprintf(defaultStream::error_stream(),
2880 "Invalid maximum heap size: %s\n", option->optionString);
2881 describe_range_error(errcode);
2882 return JNI_EINVAL;
2883 }
2884 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2885 // Xmaxf
2886 } else if (match_option(option, "-Xmaxf", &tail)) {
2887 char* err;
2888 int maxf = (int)(strtod(tail, &err) * 100);
2889 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2890 jio_fprintf(defaultStream::error_stream(),
2891 "Bad max heap free percentage size: %s\n",
2892 option->optionString);
2893 return JNI_EINVAL;
2894 } else {
2895 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2896 }
2897 // Xminf
2898 } else if (match_option(option, "-Xminf", &tail)) {
2899 char* err;
2900 int minf = (int)(strtod(tail, &err) * 100);
2901 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2902 jio_fprintf(defaultStream::error_stream(),
2903 "Bad min heap free percentage size: %s\n",
2904 option->optionString);
2905 return JNI_EINVAL;
2906 } else {
2907 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2908 }
2909 // -Xss
2910 } else if (match_option(option, "-Xss", &tail)) {
2911 julong long_ThreadStackSize = 0;
2912 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2913 if (errcode != arg_in_range) {
2914 jio_fprintf(defaultStream::error_stream(),
2915 "Invalid thread stack size: %s\n", option->optionString);
2916 describe_range_error(errcode);
2917 return JNI_EINVAL;
2918 }
2919 // Internally track ThreadStackSize in units of 1024 bytes.
2920 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2921 round_to((int)long_ThreadStackSize, K) / K);
2922 // -Xoss
2923 } else if (match_option(option, "-Xoss", &tail)) {
2924 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2925 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2926 julong long_CodeCacheExpansionSize = 0;
2927 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2928 if (errcode != arg_in_range) {
2929 jio_fprintf(defaultStream::error_stream(),
2930 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2931 os::vm_page_size()/K);
2932 return JNI_EINVAL;
2933 }
2934 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2935 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2936 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2937 julong long_ReservedCodeCacheSize = 0;
2938
2939 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2940 if (errcode != arg_in_range) {
2941 jio_fprintf(defaultStream::error_stream(),
2942 "Invalid maximum code cache size: %s.\n", option->optionString);
2943 return JNI_EINVAL;
2944 }
2945 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2946 //-XX:IncreaseFirstTierCompileThresholdAt=
2947 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2948 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2949 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2950 jio_fprintf(defaultStream::error_stream(),
2951 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2952 option->optionString);
2953 return JNI_EINVAL;
2954 }
2955 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2956 // -green
2957 } else if (match_option(option, "-green", &tail)) {
2958 jio_fprintf(defaultStream::error_stream(),
2959 "Green threads support not available\n");
2960 return JNI_EINVAL;
2961 // -native
2962 } else if (match_option(option, "-native", &tail)) {
2963 // HotSpot always uses native threads, ignore silently for compatibility
2964 // -Xsqnopause
2965 } else if (match_option(option, "-Xsqnopause", &tail)) {
2966 // EVM option, ignore silently for compatibility
2967 // -Xrs
2968 } else if (match_option(option, "-Xrs", &tail)) {
2969 // Classic/EVM option, new functionality
2970 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2971 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2972 // change default internal VM signals used - lower case for back compat
2973 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2974 // -Xoptimize
2975 } else if (match_option(option, "-Xoptimize", &tail)) {
2976 // EVM option, ignore silently for compatibility
2977 // -Xprof
2978 } else if (match_option(option, "-Xprof", &tail)) {
2979 #if INCLUDE_FPROF
2980 _has_profile = true;
2981 #else // INCLUDE_FPROF
2982 jio_fprintf(defaultStream::error_stream(),
2983 "Flat profiling is not supported in this VM.\n");
2984 return JNI_ERR;
2985 #endif // INCLUDE_FPROF
2986 // -Xconcurrentio
2987 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2988 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2989 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2990 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2991 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2992 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2993
2994 // -Xinternalversion
2995 } else if (match_option(option, "-Xinternalversion", &tail)) {
2996 jio_fprintf(defaultStream::output_stream(), "%s\n",
2997 VM_Version::internal_vm_info_string());
2998 vm_exit(0);
2999 #ifndef PRODUCT
3000 // -Xprintflags
3001 } else if (match_option(option, "-Xprintflags", &tail)) {
3002 CommandLineFlags::printFlags(tty, false);
3003 vm_exit(0);
3004 #endif
3005 // -D
3006 } else if (match_option(option, "-D", &tail)) {
3007 if (CheckEndorsedAndExtDirs) {
3008 if (match_option(option, "-Djava.endorsed.dirs=", &tail)) {
3009 // abort if -Djava.endorsed.dirs is set
3010 jio_fprintf(defaultStream::output_stream(),
3011 "-Djava.endorsed.dirs will not be supported in a future release.\n"
3012 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3013 return JNI_EINVAL;
3014 }
3015 if (match_option(option, "-Djava.ext.dirs=", &tail)) {
3016 // abort if -Djava.ext.dirs is set
3017 jio_fprintf(defaultStream::output_stream(),
3018 "-Djava.ext.dirs will not be supported in a future release.\n"
3019 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3020 return JNI_EINVAL;
3021 }
3022 }
3023
3024 if (!add_property(tail)) {
3025 return JNI_ENOMEM;
3026 }
3027 // Out of the box management support
3028 if (match_option(option, "-Dcom.sun.management", &tail)) {
3029 #if INCLUDE_MANAGEMENT
3030 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3031 #else
3032 jio_fprintf(defaultStream::output_stream(),
3033 "-Dcom.sun.management is not supported in this VM.\n");
3034 return JNI_ERR;
3035 #endif
3036 }
3037 // -Xint
3038 } else if (match_option(option, "-Xint", &tail)) {
3039 set_mode_flags(_int);
3040 // -Xmixed
3041 } else if (match_option(option, "-Xmixed", &tail)) {
3042 set_mode_flags(_mixed);
3043 // -Xcomp
3044 } else if (match_option(option, "-Xcomp", &tail)) {
3045 // for testing the compiler; turn off all flags that inhibit compilation
3046 set_mode_flags(_comp);
3047 // -Xshare:dump
3048 } else if (match_option(option, "-Xshare:dump", &tail)) {
3049 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3050 set_mode_flags(_int); // Prevent compilation, which creates objects
3051 // -Xshare:on
3052 } else if (match_option(option, "-Xshare:on", &tail)) {
3053 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3054 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3055 // -Xshare:auto
3056 } else if (match_option(option, "-Xshare:auto", &tail)) {
3057 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3058 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3059 // -Xshare:off
3060 } else if (match_option(option, "-Xshare:off", &tail)) {
3061 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3062 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3063 // -Xverify
3064 } else if (match_option(option, "-Xverify", &tail)) {
3065 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3066 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3067 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3068 } else if (strcmp(tail, ":remote") == 0) {
3069 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3070 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3071 } else if (strcmp(tail, ":none") == 0) {
3072 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3073 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3074 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3075 return JNI_EINVAL;
3076 }
3077 // -Xdebug
3078 } else if (match_option(option, "-Xdebug", &tail)) {
3079 // note this flag has been used, then ignore
3080 set_xdebug_mode(true);
3081 // -Xnoagent
3082 } else if (match_option(option, "-Xnoagent", &tail)) {
3083 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3084 } else if (match_option(option, "-Xboundthreads", &tail)) {
3085 // Bind user level threads to kernel threads (Solaris only)
3086 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3087 } else if (match_option(option, "-Xloggc:", &tail)) {
3088 // Redirect GC output to the file. -Xloggc:<filename>
3089 // ostream_init_log(), when called will use this filename
3090 // to initialize a fileStream.
3091 _gc_log_filename = strdup(tail);
3092 if (!is_filename_valid(_gc_log_filename)) {
3093 jio_fprintf(defaultStream::output_stream(),
3094 "Invalid file name for use with -Xloggc: Filename can only contain the "
3095 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3096 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3097 return JNI_EINVAL;
3098 }
3099 FLAG_SET_CMDLINE(bool, PrintGC, true);
3100 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3101
3102 // JNI hooks
3103 } else if (match_option(option, "-Xcheck", &tail)) {
3104 if (!strcmp(tail, ":jni")) {
3105 #if !INCLUDE_JNI_CHECK
3106 warning("JNI CHECKING is not supported in this VM");
3107 #else
3108 CheckJNICalls = true;
3109 #endif // INCLUDE_JNI_CHECK
3110 } else if (is_bad_option(option, args->ignoreUnrecognized,
3111 "check")) {
3112 return JNI_EINVAL;
3113 }
3114 } else if (match_option(option, "vfprintf", &tail)) {
3115 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3116 } else if (match_option(option, "exit", &tail)) {
3117 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3118 } else if (match_option(option, "abort", &tail)) {
3119 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3120 // -XX:+AggressiveHeap
3121 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3122
3123 // This option inspects the machine and attempts to set various
3124 // parameters to be optimal for long-running, memory allocation
3125 // intensive jobs. It is intended for machines with large
3126 // amounts of cpu and memory.
3127
3128 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3129 // VM, but we may not be able to represent the total physical memory
3130 // available (like having 8gb of memory on a box but using a 32bit VM).
3131 // Thus, we need to make sure we're using a julong for intermediate
3132 // calculations.
3133 julong initHeapSize;
3134 julong total_memory = os::physical_memory();
3135
3136 if (total_memory < (julong)256*M) {
3137 jio_fprintf(defaultStream::error_stream(),
3138 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3139 vm_exit(1);
3140 }
3141
3142 // The heap size is half of available memory, or (at most)
3143 // all of possible memory less 160mb (leaving room for the OS
3144 // when using ISM). This is the maximum; because adaptive sizing
3145 // is turned on below, the actual space used may be smaller.
3146
3147 initHeapSize = MIN2(total_memory / (julong)2,
3148 total_memory - (julong)160*M);
3149
3150 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3151
3152 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3153 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3154 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3155 // Currently the minimum size and the initial heap sizes are the same.
3156 set_min_heap_size(initHeapSize);
3157 }
3158 if (FLAG_IS_DEFAULT(NewSize)) {
3159 // Make the young generation 3/8ths of the total heap.
3160 FLAG_SET_CMDLINE(uintx, NewSize,
3161 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3162 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3163 }
3164
3165 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3166 FLAG_SET_DEFAULT(UseLargePages, true);
3167 #endif
3168
3169 // Increase some data structure sizes for efficiency
3170 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3171 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3172 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3173
3174 // See the OldPLABSize comment below, but replace 'after promotion'
3175 // with 'after copying'. YoungPLABSize is the size of the survivor
3176 // space per-gc-thread buffers. The default is 4kw.
3177 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3178
3179 // OldPLABSize is the size of the buffers in the old gen that
3180 // UseParallelGC uses to promote live data that doesn't fit in the
3181 // survivor spaces. At any given time, there's one for each gc thread.
3182 // The default size is 1kw. These buffers are rarely used, since the
3183 // survivor spaces are usually big enough. For specjbb, however, there
3184 // are occasions when there's lots of live data in the young gen
3185 // and we end up promoting some of it. We don't have a definite
3186 // explanation for why bumping OldPLABSize helps, but the theory
3187 // is that a bigger PLAB results in retaining something like the
3188 // original allocation order after promotion, which improves mutator
3189 // locality. A minor effect may be that larger PLABs reduce the
3190 // number of PLAB allocation events during gc. The value of 8kw
3191 // was arrived at by experimenting with specjbb.
3192 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3193
3194 // Enable parallel GC and adaptive generation sizing
3195 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3196
3197 // Encourage steady state memory management
3198 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3199
3200 // This appears to improve mutator locality
3201 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3202
3203 // Get around early Solaris scheduling bug
3204 // (affinity vs other jobs on system)
3205 // but disallow DR and offlining (5008695).
3206 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3207
3208 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3209 // The last option must always win.
3210 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3211 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3212 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3213 // The last option must always win.
3214 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3215 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3216 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3217 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3218 jio_fprintf(defaultStream::error_stream(),
3219 "Please use CMSClassUnloadingEnabled in place of "
3220 "CMSPermGenSweepingEnabled in the future\n");
3221 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3222 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3223 jio_fprintf(defaultStream::error_stream(),
3224 "Please use -XX:+UseGCOverheadLimit in place of "
3225 "-XX:+UseGCTimeLimit in the future\n");
3226 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3227 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3228 jio_fprintf(defaultStream::error_stream(),
3229 "Please use -XX:-UseGCOverheadLimit in place of "
3230 "-XX:-UseGCTimeLimit in the future\n");
3231 // The TLE options are for compatibility with 1.3 and will be
3232 // removed without notice in a future release. These options
3233 // are not to be documented.
3234 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3235 // No longer used.
3236 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3237 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3238 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3239 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3240 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3241 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3242 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3243 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3244 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3245 // No longer used.
3246 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3247 julong long_tlab_size = 0;
3248 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3249 if (errcode != arg_in_range) {
3250 jio_fprintf(defaultStream::error_stream(),
3251 "Invalid TLAB size: %s\n", option->optionString);
3252 describe_range_error(errcode);
3253 return JNI_EINVAL;
3254 }
3255 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3256 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3257 // No longer used.
3258 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3259 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3260 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3261 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3262 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3263 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3264 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3265 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3266 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3267 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3268 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3269 #if defined(DTRACE_ENABLED)
3270 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3271 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3272 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3273 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3274 #else // defined(DTRACE_ENABLED)
3275 jio_fprintf(defaultStream::error_stream(),
3276 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3277 return JNI_EINVAL;
3278 #endif // defined(DTRACE_ENABLED)
3279 #ifdef ASSERT
3280 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3281 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3282 // disable scavenge before parallel mark-compact
3283 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3284 #endif
3285 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3286 julong cms_blocks_to_claim = (julong)atol(tail);
3287 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3288 jio_fprintf(defaultStream::error_stream(),
3289 "Please use -XX:OldPLABSize in place of "
3290 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3291 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3292 julong cms_blocks_to_claim = (julong)atol(tail);
3293 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3294 jio_fprintf(defaultStream::error_stream(),
3295 "Please use -XX:OldPLABSize in place of "
3296 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3297 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3298 julong old_plab_size = 0;
3299 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3300 if (errcode != arg_in_range) {
3301 jio_fprintf(defaultStream::error_stream(),
3302 "Invalid old PLAB size: %s\n", option->optionString);
3303 describe_range_error(errcode);
3304 return JNI_EINVAL;
3305 }
3306 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3307 jio_fprintf(defaultStream::error_stream(),
3308 "Please use -XX:OldPLABSize in place of "
3309 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3310 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3311 julong young_plab_size = 0;
3312 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3313 if (errcode != arg_in_range) {
3314 jio_fprintf(defaultStream::error_stream(),
3315 "Invalid young PLAB size: %s\n", option->optionString);
3316 describe_range_error(errcode);
3317 return JNI_EINVAL;
3318 }
3319 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3320 jio_fprintf(defaultStream::error_stream(),
3321 "Please use -XX:YoungPLABSize in place of "
3322 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3323 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3324 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3325 julong stack_size = 0;
3326 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3327 if (errcode != arg_in_range) {
3328 jio_fprintf(defaultStream::error_stream(),
3329 "Invalid mark stack size: %s\n", option->optionString);
3330 describe_range_error(errcode);
3331 return JNI_EINVAL;
3332 }
3333 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3334 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3335 julong max_stack_size = 0;
3336 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3337 if (errcode != arg_in_range) {
3338 jio_fprintf(defaultStream::error_stream(),
3339 "Invalid maximum mark stack size: %s\n",
3340 option->optionString);
3341 describe_range_error(errcode);
3342 return JNI_EINVAL;
3343 }
3344 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3345 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3346 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3347 uintx conc_threads = 0;
3348 if (!parse_uintx(tail, &conc_threads, 1)) {
3349 jio_fprintf(defaultStream::error_stream(),
3350 "Invalid concurrent threads: %s\n", option->optionString);
3351 return JNI_EINVAL;
3352 }
3353 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3354 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3355 julong max_direct_memory_size = 0;
3356 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3357 if (errcode != arg_in_range) {
3358 jio_fprintf(defaultStream::error_stream(),
3359 "Invalid maximum direct memory size: %s\n",
3360 option->optionString);
3361 describe_range_error(errcode);
3362 return JNI_EINVAL;
3363 }
3364 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3365 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3366 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3367 // away and will cause VM initialization failures!
3368 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3369 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3370 #if !INCLUDE_MANAGEMENT
3371 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3372 jio_fprintf(defaultStream::error_stream(),
3373 "ManagementServer is not supported in this VM.\n");
3374 return JNI_ERR;
3375 #endif // INCLUDE_MANAGEMENT
3376 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3377 // Skip -XX:Flags= since that case has already been handled
3378 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3379 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3380 return JNI_EINVAL;
3381 }
3382 }
3383 // Unknown option
3384 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3385 return JNI_ERR;
3386 }
3387 }
3388
3389 // PrintSharedArchiveAndExit will turn on
3390 // -Xshare:on
3391 // -XX:+TraceClassPaths
3392 if (PrintSharedArchiveAndExit) {
3393 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3394 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3395 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3396 }
3397
3398 // Change the default value for flags which have different default values
3399 // when working with older JDKs.
3400 #ifdef LINUX
3401 if (JDK_Version::current().compare_major(6) <= 0 &&
3402 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3403 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3404 }
3405 #endif // LINUX
3406 fix_appclasspath();
3407 return JNI_OK;
3408 }
3409
3410 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3411 //
3412 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3413 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3414 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3415 // path is treated as the current directory.
3416 //
3417 // This causes problems with CDS, which requires that all directories specified in the classpath
3418 // must be empty. In most cases, applications do NOT want to load classes from the current
3419 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3420 // scripts compatible with CDS.
3421 void Arguments::fix_appclasspath() {
3422 if (IgnoreEmptyClassPaths) {
3423 const char separator = *os::path_separator();
3424 const char* src = _java_class_path->value();
3425
3426 // skip over all the leading empty paths
3427 while (*src == separator) {
3428 src ++;
3429 }
3430
3431 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3432 strncpy(copy, src, strlen(src) + 1);
3433
3434 // trim all trailing empty paths
3435 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3436 *tail = '\0';
3437 }
3438
3439 char from[3] = {separator, separator, '\0'};
3440 char to [2] = {separator, '\0'};
3441 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3442 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3443 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3444 }
3445
3446 _java_class_path->set_value(copy);
3447 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3448 }
3449
3450 if (!PrintSharedArchiveAndExit) {
3451 ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
3452 }
3453 }
3454
3455 static bool has_jar_files(const char* directory) {
3456 DIR* dir = os::opendir(directory);
3457 if (dir == NULL) return false;
3458
3459 struct dirent *entry;
3460 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3461 bool hasJarFile = false;
3462 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3463 const char* name = entry->d_name;
3464 const char* ext = name + strlen(name) - 4;
3465 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3466 }
3467 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
3468 os::closedir(dir);
3469 return hasJarFile ;
3470 }
3471
3472 // returns the number of directories in the given path containing JAR files
3473 // If the skip argument is not NULL, it will skip that directory
3474 static int check_non_empty_dirs(const char* path, const char* type, const char* skip) {
3475 const char separator = *os::path_separator();
3476 const char* const end = path + strlen(path);
3477 int nonEmptyDirs = 0;
3478 while (path < end) {
3479 const char* tmp_end = strchr(path, separator);
3480 if (tmp_end == NULL) {
3481 if ((skip == NULL || strcmp(path, skip) != 0) && has_jar_files(path)) {
3482 nonEmptyDirs++;
3483 jio_fprintf(defaultStream::output_stream(),
3484 "Non-empty %s directory: %s\n", type, path);
3485 }
3486 path = end;
3487 } else {
3488 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3489 memcpy(dirpath, path, tmp_end - path);
3490 dirpath[tmp_end - path] = '\0';
3491 if ((skip == NULL || strcmp(dirpath, skip) != 0) && has_jar_files(dirpath)) {
3492 nonEmptyDirs++;
3493 jio_fprintf(defaultStream::output_stream(),
3494 "Non-empty %s directory: %s\n", type, dirpath);
3495 }
3496 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
3497 path = tmp_end + 1;
3498 }
3499 }
3500 return nonEmptyDirs;
3501 }
3502
3503 // Returns true if endorsed standards override mechanism and extension mechanism
3504 // are not used.
3505 static bool check_endorsed_and_ext_dirs() {
3506 if (!CheckEndorsedAndExtDirs)
3507 return true;
3508
3509 char endorsedDir[JVM_MAXPATHLEN];
3510 char extDir[JVM_MAXPATHLEN];
3511 const char* fileSep = os::file_separator();
3512 jio_snprintf(endorsedDir, sizeof(endorsedDir), "%s%slib%sendorsed",
3513 Arguments::get_java_home(), fileSep, fileSep);
3514 jio_snprintf(extDir, sizeof(extDir), "%s%slib%sext",
3515 Arguments::get_java_home(), fileSep, fileSep);
3516
3517 // check endorsed directory
3518 int nonEmptyDirs = check_non_empty_dirs(Arguments::get_endorsed_dir(), "endorsed", NULL);
3519
3520 // check the extension directories but skip the default lib/ext directory
3521 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs(), "extension", extDir);
3522
3523 // List of JAR files installed in the default lib/ext directory.
3524 // -XX:+CheckEndorsedAndExtDirs checks if any non-JDK file installed
3525 static const char* jdk_ext_jars[] = {
3526 "access-bridge-32.jar",
3527 "access-bridge-64.jar",
3528 "access-bridge.jar",
3529 "cldrdata.jar",
3530 "dnsns.jar",
3531 "jaccess.jar",
3532 "jfxrt.jar",
3533 "localedata.jar",
3534 "nashorn.jar",
3535 "sunec.jar",
3536 "sunjce_provider.jar",
3537 "sunmscapi.jar",
3538 "sunpkcs11.jar",
3539 "ucrypto.jar",
3540 "zipfs.jar",
3541 NULL
3542 };
3543
3544 // check if the default lib/ext directory has any non-JDK jar files; if so, error
3545 DIR* dir = os::opendir(extDir);
3546 if (dir != NULL) {
3547 int num_ext_jars = 0;
3548 struct dirent *entry;
3549 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(extDir), mtInternal);
3550 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3551 const char* name = entry->d_name;
3552 const char* ext = name + strlen(name) - 4;
3553 if (ext > name && (os::file_name_strcmp(ext, ".jar") == 0)) {
3554 bool is_jdk_jar = false;
3555 const char* jarfile = NULL;
3556 for (int i=0; (jarfile = jdk_ext_jars[i]) != NULL; i++) {
3557 if (os::file_name_strcmp(name, jarfile) == 0) {
3558 is_jdk_jar = true;
3559 break;
3560 }
3561 }
3562 if (!is_jdk_jar) {
3563 jio_fprintf(defaultStream::output_stream(),
3564 "%s installed in <JAVA_HOME>/lib/ext\n", name);
3565 num_ext_jars++;
3566 }
3567 }
3568 }
3569 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
3570 os::closedir(dir);
3571 if (num_ext_jars > 0) {
3572 nonEmptyDirs += 1;
3573 }
3574 }
3575
3576 // check if the default lib/endorsed directory exists; if so, error
3577 dir = os::opendir(endorsedDir);
3578 if (dir != NULL) {
3579 jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed exists\n");
3580 os::closedir(dir);
3581 nonEmptyDirs += 1;
3582 }
3583
3584 if (nonEmptyDirs > 0) {
3585 jio_fprintf(defaultStream::output_stream(),
3586 "Endorsed standards override mechanism and extension mechanism "
3587 "will not be supported in a future release.\n"
3588 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3589 return false;
3590 }
3591
3592 return true;
3593 }
3594
3595 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3596 // This must be done after all -D arguments have been processed.
3597 scp_p->expand_endorsed();
3598
3599 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3600 // Assemble the bootclasspath elements into the final path.
3601 Arguments::set_sysclasspath(scp_p->combined_path());
3602 }
3603
3604 if (!check_endorsed_and_ext_dirs()) {
3605 return JNI_ERR;
3606 }
3607
3608 // This must be done after all arguments have been processed.
3609 // java_compiler() true means set to "NONE" or empty.
3610 if (java_compiler() && !xdebug_mode()) {
3611 // For backwards compatibility, we switch to interpreted mode if
3612 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3613 // not specified.
3614 set_mode_flags(_int);
3615 }
3616 if (CompileThreshold == 0) {
3617 set_mode_flags(_int);
3618 }
3619
3620 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3621 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3622 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3623 }
3624
3625 #ifndef COMPILER2
3626 // Don't degrade server performance for footprint
3627 if (FLAG_IS_DEFAULT(UseLargePages) &&
3628 MaxHeapSize < LargePageHeapSizeThreshold) {
3629 // No need for large granularity pages w/small heaps.
3630 // Note that large pages are enabled/disabled for both the
3631 // Java heap and the code cache.
3632 FLAG_SET_DEFAULT(UseLargePages, false);
3633 }
3634
3635 #else
3636 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3637 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3638 }
3639 #endif
3640
3641 #ifndef TIERED
3642 // Tiered compilation is undefined.
3643 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3644 #endif
3645
3646 // If we are running in a headless jre, force java.awt.headless property
3647 // to be true unless the property has already been set.
3648 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3649 if (os::is_headless_jre()) {
3650 const char* headless = Arguments::get_property("java.awt.headless");
3651 if (headless == NULL) {
3652 char envbuffer[128];
3653 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3654 if (!add_property("java.awt.headless=true")) {
3655 return JNI_ENOMEM;
3656 }
3657 } else {
3658 char buffer[256];
3659 jio_snprintf(buffer, 256, "java.awt.headless=%s", envbuffer);
3660 if (!add_property(buffer)) {
3661 return JNI_ENOMEM;
3662 }
3663 }
3664 }
3665 }
3666
3667 if (!check_vm_args_consistency()) {
3668 return JNI_ERR;
3669 }
3670
3671 return JNI_OK;
3672 }
3673
3674 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3675 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3676 scp_assembly_required_p);
3677 }
3678
3679 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3680 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3681 scp_assembly_required_p);
3682 }
3683
3684 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3685 const int N_MAX_OPTIONS = 64;
3686 const int OPTION_BUFFER_SIZE = 1024;
3687 char buffer[OPTION_BUFFER_SIZE];
3688
3689 // The variable will be ignored if it exceeds the length of the buffer.
3690 // Don't check this variable if user has special privileges
3691 // (e.g. unix su command).
3692 if (os::getenv(name, buffer, sizeof(buffer)) &&
3693 !os::have_special_privileges()) {
3694 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3695 jio_fprintf(defaultStream::error_stream(),
3696 "Picked up %s: %s\n", name, buffer);
3697 char* rd = buffer; // pointer to the input string (rd)
3698 int i;
3699 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3700 while (isspace(*rd)) rd++; // skip whitespace
3701 if (*rd == 0) break; // we re done when the input string is read completely
3702
3703 // The output, option string, overwrites the input string.
3704 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3705 // input string (rd).
3706 char* wrt = rd;
3707
3708 options[i++].optionString = wrt; // Fill in option
3709 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3710 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3711 int quote = *rd; // matching quote to look for
3712 rd++; // don't copy open quote
3713 while (*rd != quote) { // include everything (even spaces) up until quote
3714 if (*rd == 0) { // string termination means unmatched string
3715 jio_fprintf(defaultStream::error_stream(),
3716 "Unmatched quote in %s\n", name);
3717 return JNI_ERR;
3718 }
3719 *wrt++ = *rd++; // copy to option string
3720 }
3721 rd++; // don't copy close quote
3722 } else {
3723 *wrt++ = *rd++; // copy to option string
3724 }
3725 }
3726 // Need to check if we're done before writing a NULL,
3727 // because the write could be to the byte that rd is pointing to.
3728 if (*rd++ == 0) {
3729 *wrt = 0;
3730 break;
3731 }
3732 *wrt = 0; // Zero terminate option
3733 }
3734 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3735 JavaVMInitArgs vm_args;
3736 vm_args.version = JNI_VERSION_1_2;
3737 vm_args.options = options;
3738 vm_args.nOptions = i;
3739 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3740
3741 if (PrintVMOptions) {
3742 const char* tail;
3743 for (int i = 0; i < vm_args.nOptions; i++) {
3744 const JavaVMOption *option = vm_args.options + i;
3745 if (match_option(option, "-XX:", &tail)) {
3746 logOption(tail);
3747 }
3748 }
3749 }
3750
3751 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3752 }
3753 return JNI_OK;
3754 }
3755
3756 void Arguments::set_shared_spaces_flags() {
3757 if (DumpSharedSpaces) {
3758 if (FailOverToOldVerifier) {
3759 // Don't fall back to the old verifier on verification failure. If a
3760 // class fails verification with the split verifier, it might fail the
3761 // CDS runtime verifier constraint check. In that case, we don't want
3762 // to share the class. We only archive classes that pass the split verifier.
3763 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3764 }
3765
3766 if (RequireSharedSpaces) {
3767 warning("cannot dump shared archive while using shared archive");
3768 }
3769 UseSharedSpaces = false;
3770 #ifdef _LP64
3771 if (!UseCompressedOops || !UseCompressedClassPointers) {
3772 vm_exit_during_initialization(
3773 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3774 }
3775 } else {
3776 if (!UseCompressedOops || !UseCompressedClassPointers) {
3777 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3778 }
3779 #endif
3780 }
3781 }
3782
3783 #if !INCLUDE_ALL_GCS
3784 static void force_serial_gc() {
3785 FLAG_SET_DEFAULT(UseSerialGC, true);
3786 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3787 UNSUPPORTED_GC_OPTION(UseG1GC);
3788 UNSUPPORTED_GC_OPTION(UseParallelGC);
3789 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3790 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3791 UNSUPPORTED_GC_OPTION(UseParNewGC);
3792 }
3793 #endif // INCLUDE_ALL_GCS
3794
3795 // Sharing support
3796 // Construct the path to the archive
3797 static char* get_shared_archive_path() {
3798 char *shared_archive_path;
3799 if (SharedArchiveFile == NULL) {
3800 char jvm_path[JVM_MAXPATHLEN];
3801 os::jvm_path(jvm_path, sizeof(jvm_path));
3802 char *end = strrchr(jvm_path, *os::file_separator());
3803 if (end != NULL) *end = '\0';
3804 size_t jvm_path_len = strlen(jvm_path);
3805 size_t file_sep_len = strlen(os::file_separator());
3806 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3807 file_sep_len + 20, mtInternal);
3808 if (shared_archive_path != NULL) {
3809 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3810 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3811 strncat(shared_archive_path, "classes.jsa", 11);
3812 }
3813 } else {
3814 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3815 if (shared_archive_path != NULL) {
3816 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3817 }
3818 }
3819 return shared_archive_path;
3820 }
3821
3822 #ifndef PRODUCT
3823 // Determine whether LogVMOutput should be implicitly turned on.
3824 static bool use_vm_log() {
3825 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3826 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3827 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3828 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3829 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3830 return true;
3831 }
3832
3833 #ifdef COMPILER1
3834 if (PrintC1Statistics) {
3835 return true;
3836 }
3837 #endif // COMPILER1
3838
3839 #ifdef COMPILER2
3840 if (PrintOptoAssembly || PrintOptoStatistics) {
3841 return true;
3842 }
3843 #endif // COMPILER2
3844
3845 return false;
3846 }
3847 #endif // PRODUCT
3848
3849 // Parse entry point called from JNI_CreateJavaVM
3850
3851 jint Arguments::parse(const JavaVMInitArgs* args) {
3852
3853 // Remaining part of option string
3854 const char* tail;
3855
3856 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3857 const char* hotspotrc = ".hotspotrc";
3858 bool settings_file_specified = false;
3859 bool needs_hotspotrc_warning = false;
3860
3861 ArgumentsExt::process_options(args);
3862
3863 const char* flags_file;
3864 int index;
3865 for (index = 0; index < args->nOptions; index++) {
3866 const JavaVMOption *option = args->options + index;
3867 if (match_option(option, "-XX:Flags=", &tail)) {
3868 flags_file = tail;
3869 settings_file_specified = true;
3870 }
3871 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3872 PrintVMOptions = true;
3873 }
3874 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3875 PrintVMOptions = false;
3876 }
3877 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3878 IgnoreUnrecognizedVMOptions = true;
3879 }
3880 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3881 IgnoreUnrecognizedVMOptions = false;
3882 }
3883 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3884 CommandLineFlags::printFlags(tty, false);
3885 vm_exit(0);
3886 }
3887 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3888 #if INCLUDE_NMT
3889 // The launcher did not setup nmt environment variable properly.
3890 if (!MemTracker::check_launcher_nmt_support(tail)) {
3891 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3892 }
3893
3894 // Verify if nmt option is valid.
3895 if (MemTracker::verify_nmt_option()) {
3896 // Late initialization, still in single-threaded mode.
3897 if (MemTracker::tracking_level() >= NMT_summary) {
3898 MemTracker::init();
3899 }
3900 } else {
3901 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3902 }
3903 #else
3904 jio_fprintf(defaultStream::error_stream(),
3905 "Native Memory Tracking is not supported in this VM\n");
3906 return JNI_ERR;
3907 #endif
3908 }
3909
3910
3911 #ifndef PRODUCT
3912 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3913 CommandLineFlags::printFlags(tty, true);
3914 vm_exit(0);
3915 }
3916 #endif
3917 }
3918
3919 if (IgnoreUnrecognizedVMOptions) {
3920 // uncast const to modify the flag args->ignoreUnrecognized
3921 *(jboolean*)(&args->ignoreUnrecognized) = true;
3922 }
3923
3924 // Parse specified settings file
3925 if (settings_file_specified) {
3926 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3927 return JNI_EINVAL;
3928 }
3929 } else {
3930 #ifdef ASSERT
3931 // Parse default .hotspotrc settings file
3932 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3933 return JNI_EINVAL;
3934 }
3935 #else
3936 struct stat buf;
3937 if (os::stat(hotspotrc, &buf) == 0) {
3938 needs_hotspotrc_warning = true;
3939 }
3940 #endif
3941 }
3942
3943 if (PrintVMOptions) {
3944 for (index = 0; index < args->nOptions; index++) {
3945 const JavaVMOption *option = args->options + index;
3946 if (match_option(option, "-XX:", &tail)) {
3947 logOption(tail);
3948 }
3949 }
3950 }
3951
3952 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3953 jint result = parse_vm_init_args(args);
3954 if (result != JNI_OK) {
3955 return result;
3956 }
3957
3958 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3959 SharedArchivePath = get_shared_archive_path();
3960 if (SharedArchivePath == NULL) {
3961 return JNI_ENOMEM;
3962 }
3963
3964 // Set up VerifySharedSpaces
3965 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3966 VerifySharedSpaces = true;
3967 }
3968
3969 // Delay warning until here so that we've had a chance to process
3970 // the -XX:-PrintWarnings flag
3971 if (needs_hotspotrc_warning) {
3972 warning("%s file is present but has been ignored. "
3973 "Run with -XX:Flags=%s to load the file.",
3974 hotspotrc, hotspotrc);
3975 }
3976
3977 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3978 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3979 #endif
3980
3981 #if INCLUDE_ALL_GCS
3982 #if (defined JAVASE_EMBEDDED || defined ARM)
3983 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3984 #endif
3985 #endif
3986
3987 #ifndef PRODUCT
3988 if (TraceBytecodesAt != 0) {
3989 TraceBytecodes = true;
3990 }
3991 if (CountCompiledCalls) {
3992 if (UseCounterDecay) {
3993 warning("UseCounterDecay disabled because CountCalls is set");
3994 UseCounterDecay = false;
3995 }
3996 }
3997 #endif // PRODUCT
3998
3999 // JSR 292 is not supported before 1.7
4000 if (!JDK_Version::is_gte_jdk17x_version()) {
4001 if (EnableInvokeDynamic) {
4002 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
4003 warning("JSR 292 is not supported before 1.7. Disabling support.");
4004 }
4005 EnableInvokeDynamic = false;
4006 }
4007 }
4008
4009 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
4010 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4011 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
4012 }
4013 ScavengeRootsInCode = 1;
4014 }
4015
4016 if (PrintGCDetails) {
4017 // Turn on -verbose:gc options as well
4018 PrintGC = true;
4019 }
4020
4021 if (!JDK_Version::is_gte_jdk18x_version()) {
4022 // To avoid changing the log format for 7 updates this flag is only
4023 // true by default in JDK8 and above.
4024 if (FLAG_IS_DEFAULT(PrintGCCause)) {
4025 FLAG_SET_DEFAULT(PrintGCCause, false);
4026 }
4027 }
4028
4029 // Set object alignment values.
4030 set_object_alignment();
4031
4032 #if !INCLUDE_ALL_GCS
4033 force_serial_gc();
4034 #endif // INCLUDE_ALL_GCS
4035 #if !INCLUDE_CDS
4036 if (DumpSharedSpaces || RequireSharedSpaces) {
4037 jio_fprintf(defaultStream::error_stream(),
4038 "Shared spaces are not supported in this VM\n");
4039 return JNI_ERR;
4040 }
4041 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4042 warning("Shared spaces are not supported in this VM");
4043 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4044 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4045 }
4046 no_shared_spaces("CDS Disabled");
4047 #endif // INCLUDE_CDS
4048
4049 return JNI_OK;
4050 }
4051
4052 jint Arguments::apply_ergo() {
4053
4054 // Set flags based on ergonomics.
4055 set_ergonomics_flags();
4056
4057 set_shared_spaces_flags();
4058
4059 #if defined(SPARC)
4060 // BIS instructions require 'membar' instruction regardless of the number
4061 // of CPUs because in virtualized/container environments which might use only 1
4062 // CPU, BIS instructions may produce incorrect results.
4063
4064 if (FLAG_IS_DEFAULT(AssumeMP)) {
4065 FLAG_SET_DEFAULT(AssumeMP, true);
4066 }
4067 #endif
4068
4069 // Check the GC selections again.
4070 if (!check_gc_consistency()) {
4071 return JNI_EINVAL;
4072 }
4073
4074 if (TieredCompilation) {
4075 set_tiered_flags();
4076 } else {
4077 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
4078 if (CompilationPolicyChoice >= 2) {
4079 vm_exit_during_initialization(
4080 "Incompatible compilation policy selected", NULL);
4081 }
4082 }
4083 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
4084 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4085 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
4086 }
4087
4088
4089 // Set heap size based on available physical memory
4090 set_heap_size();
4091
4092 ArgumentsExt::set_gc_specific_flags();
4093
4094 // Initialize Metaspace flags and alignments.
4095 Metaspace::ergo_initialize();
4096
4097 // Set bytecode rewriting flags
4098 set_bytecode_flags();
4099
4100 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
4101 set_aggressive_opts_flags();
4102
4103 // Turn off biased locking for locking debug mode flags,
4104 // which are subtlely different from each other but neither works with
4105 // biased locking.
4106 if (UseHeavyMonitors
4107 #ifdef COMPILER1
4108 || !UseFastLocking
4109 #endif // COMPILER1
4110 ) {
4111 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4112 // flag set to true on command line; warn the user that they
4113 // can't enable biased locking here
4114 warning("Biased Locking is not supported with locking debug flags"
4115 "; ignoring UseBiasedLocking flag." );
4116 }
4117 UseBiasedLocking = false;
4118 }
4119
4120 #ifdef ZERO
4121 // Clear flags not supported on zero.
4122 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4123 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4124 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4125 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4126 #endif // CC_INTERP
4127
4128 #ifdef COMPILER2
4129 if (!EliminateLocks) {
4130 EliminateNestedLocks = false;
4131 }
4132 if (!Inline) {
4133 IncrementalInline = false;
4134 }
4135 #ifndef PRODUCT
4136 if (!IncrementalInline) {
4137 AlwaysIncrementalInline = false;
4138 }
4139 #endif
4140 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
4141 // incremental inlining: bump MaxNodeLimit
4142 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
4143 }
4144 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4145 // nothing to use the profiling, turn if off
4146 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4147 }
4148 #endif
4149
4150 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4151 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4152 DebugNonSafepoints = true;
4153 }
4154
4155 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4156 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4157 }
4158
4159 if (UseOnStackReplacement && !UseLoopCounter) {
4160 warning("On-stack-replacement requires loop counters; enabling loop counters");
4161 FLAG_SET_DEFAULT(UseLoopCounter, true);
4162 }
4163
4164 #ifndef PRODUCT
4165 if (CompileTheWorld) {
4166 // Force NmethodSweeper to sweep whole CodeCache each time.
4167 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4168 NmethodSweepFraction = 1;
4169 }
4170 }
4171
4172 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4173 if (use_vm_log()) {
4174 LogVMOutput = true;
4175 }
4176 }
4177 #endif // PRODUCT
4178
4179 if (PrintCommandLineFlags) {
4180 CommandLineFlags::printSetFlags(tty);
4181 }
4182
4183 // Apply CPU specific policy for the BiasedLocking
4184 if (UseBiasedLocking) {
4185 if (!VM_Version::use_biased_locking() &&
4186 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4187 UseBiasedLocking = false;
4188 }
4189 }
4190 #ifdef COMPILER2
4191 if (!UseBiasedLocking || EmitSync != 0) {
4192 UseOptoBiasInlining = false;
4193 }
4194 #endif
4195
4196 // set PauseAtExit if the gamma launcher was used and a debugger is attached
4197 // but only if not already set on the commandline
4198 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
4199 bool set = false;
4200 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
4201 if (!set) {
4202 FLAG_SET_DEFAULT(PauseAtExit, true);
4203 }
4204 }
4205
4206 return JNI_OK;
4207 }
4208
4209 jint Arguments::adjust_after_os() {
4210 if (UseNUMA) {
4211 if (UseParallelGC || UseParallelOldGC) {
4212 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4213 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4214 }
4215 }
4216 // UseNUMAInterleaving is set to ON for all collectors and
4217 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4218 // such as the parallel collector for Linux and Solaris will
4219 // interleave old gen and survivor spaces on top of NUMA
4220 // allocation policy for the eden space.
4221 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4222 // all platforms and ParallelGC on Windows will interleave all
4223 // of the heap spaces across NUMA nodes.
4224 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4225 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4226 }
4227 }
4228 return JNI_OK;
4229 }
4230
4231 int Arguments::PropertyList_count(SystemProperty* pl) {
4232 int count = 0;
4233 while(pl != NULL) {
4234 count++;
4235 pl = pl->next();
4236 }
4237 return count;
4238 }
4239
4240 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4241 assert(key != NULL, "just checking");
4242 SystemProperty* prop;
4243 for (prop = pl; prop != NULL; prop = prop->next()) {
4244 if (strcmp(key, prop->key()) == 0) return prop->value();
4245 }
4246 return NULL;
4247 }
4248
4249 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4250 int count = 0;
4251 const char* ret_val = NULL;
4252
4253 while(pl != NULL) {
4254 if(count >= index) {
4255 ret_val = pl->key();
4256 break;
4257 }
4258 count++;
4259 pl = pl->next();
4260 }
4261
4262 return ret_val;
4263 }
4264
4265 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4266 int count = 0;
4267 char* ret_val = NULL;
4268
4269 while(pl != NULL) {
4270 if(count >= index) {
4271 ret_val = pl->value();
4272 break;
4273 }
4274 count++;
4275 pl = pl->next();
4276 }
4277
4278 return ret_val;
4279 }
4280
4281 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4282 SystemProperty* p = *plist;
4283 if (p == NULL) {
4284 *plist = new_p;
4285 } else {
4286 while (p->next() != NULL) {
4287 p = p->next();
4288 }
4289 p->set_next(new_p);
4290 }
4291 }
4292
4293 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4294 if (plist == NULL)
4295 return;
4296
4297 SystemProperty* new_p = new SystemProperty(k, v, true);
4298 PropertyList_add(plist, new_p);
4299 }
4300
4301 // This add maintains unique property key in the list.
4302 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4303 if (plist == NULL)
4304 return;
4305
4306 // If property key exist then update with new value.
4307 SystemProperty* prop;
4308 for (prop = *plist; prop != NULL; prop = prop->next()) {
4309 if (strcmp(k, prop->key()) == 0) {
4310 if (append) {
4311 prop->append_value(v);
4312 } else {
4313 prop->set_value(v);
4314 }
4315 return;
4316 }
4317 }
4318
4319 PropertyList_add(plist, k, v);
4320 }
4321
4322 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4323 // Returns true if all of the source pointed by src has been copied over to
4324 // the destination buffer pointed by buf. Otherwise, returns false.
4325 // Notes:
4326 // 1. If the length (buflen) of the destination buffer excluding the
4327 // NULL terminator character is not long enough for holding the expanded
4328 // pid characters, it also returns false instead of returning the partially
4329 // expanded one.
4330 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4331 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4332 char* buf, size_t buflen) {
4333 const char* p = src;
4334 char* b = buf;
4335 const char* src_end = &src[srclen];
4336 char* buf_end = &buf[buflen - 1];
4337
4338 while (p < src_end && b < buf_end) {
4339 if (*p == '%') {
4340 switch (*(++p)) {
4341 case '%': // "%%" ==> "%"
4342 *b++ = *p++;
4343 break;
4344 case 'p': { // "%p" ==> current process id
4345 // buf_end points to the character before the last character so
4346 // that we could write '\0' to the end of the buffer.
4347 size_t buf_sz = buf_end - b + 1;
4348 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4349
4350 // if jio_snprintf fails or the buffer is not long enough to hold
4351 // the expanded pid, returns false.
4352 if (ret < 0 || ret >= (int)buf_sz) {
4353 return false;
4354 } else {
4355 b += ret;
4356 assert(*b == '\0', "fail in copy_expand_pid");
4357 if (p == src_end && b == buf_end + 1) {
4358 // reach the end of the buffer.
4359 return true;
4360 }
4361 }
4362 p++;
4363 break;
4364 }
4365 default :
4366 *b++ = '%';
4367 }
4368 } else {
4369 *b++ = *p++;
4370 }
4371 }
4372 *b = '\0';
4373 return (p == src_end); // return false if not all of the source was copied
4374 }