1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/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.sun.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 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
564 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
565 path = add_to_path(path, jarpath, false);
566 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
567 }
568 }
569 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
570 os::closedir(dir);
571 return path;
572 }
573
574 // Parses a memory size specification string.
575 static bool atomull(const char *s, julong* result) {
576 julong n = 0;
577 int args_read = sscanf(s, JULONG_FORMAT, &n);
578 if (args_read != 1) {
579 return false;
580 }
581 while (*s != '\0' && isdigit(*s)) {
582 s++;
583 }
584 // 4705540: illegal if more characters are found after the first non-digit
585 if (strlen(s) > 1) {
586 return false;
587 }
588 switch (*s) {
589 case 'T': case 't':
590 *result = n * G * K;
591 // Check for overflow.
592 if (*result/((julong)G * K) != n) return false;
593 return true;
594 case 'G': case 'g':
595 *result = n * G;
596 if (*result/G != n) return false;
597 return true;
598 case 'M': case 'm':
599 *result = n * M;
600 if (*result/M != n) return false;
601 return true;
602 case 'K': case 'k':
603 *result = n * K;
604 if (*result/K != n) return false;
605 return true;
606 case '\0':
607 *result = n;
608 return true;
609 default:
610 return false;
611 }
612 }
613
614 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
615 if (size < min_size) return arg_too_small;
616 // Check that size will fit in a size_t (only relevant on 32-bit)
617 if (size > max_uintx) return arg_too_big;
618 return arg_in_range;
619 }
620
621 // Describe an argument out of range error
622 void Arguments::describe_range_error(ArgsRange errcode) {
623 switch(errcode) {
624 case arg_too_big:
625 jio_fprintf(defaultStream::error_stream(),
626 "The specified size exceeds the maximum "
627 "representable size.\n");
628 break;
629 case arg_too_small:
630 case arg_unreadable:
631 case arg_in_range:
632 // do nothing for now
633 break;
634 default:
635 ShouldNotReachHere();
636 }
637 }
638
639 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
640 return CommandLineFlags::boolAtPut(name, &value, origin);
641 }
642
643 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
644 double v;
645 if (sscanf(value, "%lf", &v) != 1) {
646 return false;
647 }
648
649 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
650 return true;
651 }
652 return false;
653 }
654
655 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
656 julong v;
657 intx intx_v;
658 bool is_neg = false;
659 // Check the sign first since atomull() parses only unsigned values.
660 if (*value == '-') {
661 if (!CommandLineFlags::intxAt(name, &intx_v)) {
662 return false;
663 }
664 value++;
665 is_neg = true;
666 }
667 if (!atomull(value, &v)) {
668 return false;
669 }
670 intx_v = (intx) v;
671 if (is_neg) {
672 intx_v = -intx_v;
673 }
674 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
675 return true;
676 }
677 uintx uintx_v = (uintx) v;
678 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
679 return true;
680 }
681 uint64_t uint64_t_v = (uint64_t) v;
682 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
683 return true;
684 }
685 return false;
686 }
687
688 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
689 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
690 // Contract: CommandLineFlags always returns a pointer that needs freeing.
691 FREE_C_HEAP_ARRAY(char, value, mtInternal);
692 return true;
693 }
694
695 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
696 const char* old_value = "";
697 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
698 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
699 size_t new_len = strlen(new_value);
700 const char* value;
701 char* free_this_too = NULL;
702 if (old_len == 0) {
703 value = new_value;
704 } else if (new_len == 0) {
705 value = old_value;
706 } else {
707 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
708 // each new setting adds another LINE to the switch:
709 sprintf(buf, "%s\n%s", old_value, new_value);
710 value = buf;
711 free_this_too = buf;
712 }
713 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
714 // CommandLineFlags always returns a pointer that needs freeing.
715 FREE_C_HEAP_ARRAY(char, value, mtInternal);
716 if (free_this_too != NULL) {
717 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
718 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
719 }
720 return true;
721 }
722
723 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
724
725 // range of acceptable characters spelled out for portability reasons
726 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
727 #define BUFLEN 255
728 char name[BUFLEN+1];
729 char dummy;
730
731 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
732 return set_bool_flag(name, false, origin);
733 }
734 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
735 return set_bool_flag(name, true, origin);
736 }
737
738 char punct;
739 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
740 const char* value = strchr(arg, '=') + 1;
741 Flag* flag = Flag::find_flag(name, strlen(name));
742 if (flag != NULL && flag->is_ccstr()) {
743 if (flag->ccstr_accumulates()) {
744 return append_to_string_flag(name, value, origin);
745 } else {
746 if (value[0] == '\0') {
747 value = NULL;
748 }
749 return set_string_flag(name, value, origin);
750 }
751 }
752 }
753
754 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
755 const char* value = strchr(arg, '=') + 1;
756 // -XX:Foo:=xxx will reset the string flag to the given value.
757 if (value[0] == '\0') {
758 value = NULL;
759 }
760 return set_string_flag(name, value, origin);
761 }
762
763 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
764 #define SIGNED_NUMBER_RANGE "[-0123456789]"
765 #define NUMBER_RANGE "[0123456789]"
766 char value[BUFLEN + 1];
767 char value2[BUFLEN + 1];
768 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
769 // Looks like a floating-point number -- try again with more lenient format string
770 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
771 return set_fp_numeric_flag(name, value, origin);
772 }
773 }
774
775 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
776 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
777 return set_numeric_flag(name, value, origin);
778 }
779
780 return false;
781 }
782
783 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
784 assert(bldarray != NULL, "illegal argument");
785
786 if (arg == NULL) {
787 return;
788 }
789
790 int new_count = *count + 1;
791
792 // expand the array and add arg to the last element
793 if (*bldarray == NULL) {
794 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
795 } else {
796 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
797 }
798 (*bldarray)[*count] = strdup(arg);
799 *count = new_count;
800 }
801
802 void Arguments::build_jvm_args(const char* arg) {
803 add_string(&_jvm_args_array, &_num_jvm_args, arg);
804 }
805
806 void Arguments::build_jvm_flags(const char* arg) {
807 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
808 }
809
810 // utility function to return a string that concatenates all
811 // strings in a given char** array
812 const char* Arguments::build_resource_string(char** args, int count) {
813 if (args == NULL || count == 0) {
814 return NULL;
815 }
816 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
817 for (int i = 1; i < count; i++) {
818 length += strlen(args[i]) + 1; // add 1 for a space
819 }
820 char* s = NEW_RESOURCE_ARRAY(char, length);
821 strcpy(s, args[0]);
822 for (int j = 1; j < count; j++) {
823 strcat(s, " ");
824 strcat(s, args[j]);
825 }
826 return (const char*) s;
827 }
828
829 void Arguments::print_on(outputStream* st) {
830 st->print_cr("VM Arguments:");
831 if (num_jvm_flags() > 0) {
832 st->print("jvm_flags: "); print_jvm_flags_on(st);
833 }
834 if (num_jvm_args() > 0) {
835 st->print("jvm_args: "); print_jvm_args_on(st);
836 }
837 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
838 if (_java_class_path != NULL) {
839 char* path = _java_class_path->value();
840 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
841 }
842 st->print_cr("Launcher Type: %s", _sun_java_launcher);
843 }
844
845 void Arguments::print_jvm_flags_on(outputStream* st) {
846 if (_num_jvm_flags > 0) {
847 for (int i=0; i < _num_jvm_flags; i++) {
848 st->print("%s ", _jvm_flags_array[i]);
849 }
850 st->cr();
851 }
852 }
853
854 void Arguments::print_jvm_args_on(outputStream* st) {
855 if (_num_jvm_args > 0) {
856 for (int i=0; i < _num_jvm_args; i++) {
857 st->print("%s ", _jvm_args_array[i]);
858 }
859 st->cr();
860 }
861 }
862
863 bool Arguments::process_argument(const char* arg,
864 jboolean ignore_unrecognized, Flag::Flags origin) {
865
866 JDK_Version since = JDK_Version();
867
868 if (parse_argument(arg, origin) || ignore_unrecognized) {
869 return true;
870 }
871
872 bool has_plus_minus = (*arg == '+' || *arg == '-');
873 const char* const argname = has_plus_minus ? arg + 1 : arg;
874 if (is_newly_obsolete(arg, &since)) {
875 char version[256];
876 since.to_string(version, sizeof(version));
877 warning("ignoring option %s; support was removed in %s", argname, version);
878 return true;
879 }
880
881 // For locked flags, report a custom error message if available.
882 // Otherwise, report the standard unrecognized VM option.
883
884 size_t arg_len;
885 const char* equal_sign = strchr(argname, '=');
886 if (equal_sign == NULL) {
887 arg_len = strlen(argname);
888 } else {
889 arg_len = equal_sign - argname;
890 }
891
892 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
893 if (found_flag != NULL) {
894 char locked_message_buf[BUFLEN];
895 found_flag->get_locked_message(locked_message_buf, BUFLEN);
896 if (strlen(locked_message_buf) == 0) {
897 if (found_flag->is_bool() && !has_plus_minus) {
898 jio_fprintf(defaultStream::error_stream(),
899 "Missing +/- setting for VM option '%s'\n", argname);
900 } else if (!found_flag->is_bool() && has_plus_minus) {
901 jio_fprintf(defaultStream::error_stream(),
902 "Unexpected +/- setting in VM option '%s'\n", argname);
903 } else {
904 jio_fprintf(defaultStream::error_stream(),
905 "Improperly specified VM option '%s'\n", argname);
906 }
907 } else {
908 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
909 }
910 } else {
911 jio_fprintf(defaultStream::error_stream(),
912 "Unrecognized VM option '%s'\n", argname);
913 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
914 if (fuzzy_matched != NULL) {
915 jio_fprintf(defaultStream::error_stream(),
916 "Did you mean '%s%s%s'?\n",
917 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
918 fuzzy_matched->_name,
919 (fuzzy_matched->is_bool()) ? "" : "=<value>");
920 }
921 }
922
923 // allow for commandline "commenting out" options like -XX:#+Verbose
924 return arg[0] == '#';
925 }
926
927 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
928 FILE* stream = fopen(file_name, "rb");
929 if (stream == NULL) {
930 if (should_exist) {
931 jio_fprintf(defaultStream::error_stream(),
932 "Could not open settings file %s\n", file_name);
933 return false;
934 } else {
935 return true;
936 }
937 }
938
939 char token[1024];
940 int pos = 0;
941
942 bool in_white_space = true;
943 bool in_comment = false;
944 bool in_quote = false;
945 char quote_c = 0;
946 bool result = true;
947
948 int c = getc(stream);
949 while(c != EOF && pos < (int)(sizeof(token)-1)) {
950 if (in_white_space) {
951 if (in_comment) {
952 if (c == '\n') in_comment = false;
953 } else {
954 if (c == '#') in_comment = true;
955 else if (!isspace(c)) {
956 in_white_space = false;
957 token[pos++] = c;
958 }
959 }
960 } else {
961 if (c == '\n' || (!in_quote && isspace(c))) {
962 // token ends at newline, or at unquoted whitespace
963 // this allows a way to include spaces in string-valued options
964 token[pos] = '\0';
965 logOption(token);
966 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
967 build_jvm_flags(token);
968 pos = 0;
969 in_white_space = true;
970 in_quote = false;
971 } else if (!in_quote && (c == '\'' || c == '"')) {
972 in_quote = true;
973 quote_c = c;
974 } else if (in_quote && (c == quote_c)) {
975 in_quote = false;
976 } else {
977 token[pos++] = c;
978 }
979 }
980 c = getc(stream);
981 }
982 if (pos > 0) {
983 token[pos] = '\0';
984 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
985 build_jvm_flags(token);
986 }
987 fclose(stream);
988 return result;
989 }
990
991 //=============================================================================================================
992 // Parsing of properties (-D)
993
994 const char* Arguments::get_property(const char* key) {
995 return PropertyList_get_value(system_properties(), key);
996 }
997
998 bool Arguments::add_property(const char* prop) {
999 const char* eq = strchr(prop, '=');
1000 char* key;
1001 // ns must be static--its address may be stored in a SystemProperty object.
1002 const static char ns[1] = {0};
1003 char* value = (char *)ns;
1004
1005 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1006 key = AllocateHeap(key_len + 1, mtInternal);
1007 strncpy(key, prop, key_len);
1008 key[key_len] = '\0';
1009
1010 if (eq != NULL) {
1011 size_t value_len = strlen(prop) - key_len - 1;
1012 value = AllocateHeap(value_len + 1, mtInternal);
1013 strncpy(value, &prop[key_len + 1], value_len + 1);
1014 }
1015
1016 if (strcmp(key, "java.compiler") == 0) {
1017 process_java_compiler_argument(value);
1018 FreeHeap(key);
1019 if (eq != NULL) {
1020 FreeHeap(value);
1021 }
1022 return true;
1023 } else if (strcmp(key, "sun.java.command") == 0) {
1024 _java_command = value;
1025
1026 // Record value in Arguments, but let it get passed to Java.
1027 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1028 // launcher.pid property is private and is processed
1029 // in process_sun_java_launcher_properties();
1030 // the sun.java.launcher property is passed on to the java application
1031 FreeHeap(key);
1032 if (eq != NULL) {
1033 FreeHeap(value);
1034 }
1035 return true;
1036 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1037 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1038 // its value without going through the property list or making a Java call.
1039 _java_vendor_url_bug = value;
1040 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1041 PropertyList_unique_add(&_system_properties, key, value, true);
1042 return true;
1043 }
1044 // Create new property and add at the end of the list
1045 PropertyList_unique_add(&_system_properties, key, value);
1046 return true;
1047 }
1048
1049 //===========================================================================================================
1050 // Setting int/mixed/comp mode flags
1051
1052 void Arguments::set_mode_flags(Mode mode) {
1053 // Set up default values for all flags.
1054 // If you add a flag to any of the branches below,
1055 // add a default value for it here.
1056 set_java_compiler(false);
1057 _mode = mode;
1058
1059 // Ensure Agent_OnLoad has the correct initial values.
1060 // This may not be the final mode; mode may change later in onload phase.
1061 PropertyList_unique_add(&_system_properties, "java.vm.info",
1062 (char*)VM_Version::vm_info_string(), false);
1063
1064 UseInterpreter = true;
1065 UseCompiler = true;
1066 UseLoopCounter = true;
1067
1068 #ifndef ZERO
1069 // Turn these off for mixed and comp. Leave them on for Zero.
1070 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1071 UseFastAccessorMethods = (mode == _int);
1072 }
1073 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1074 UseFastEmptyMethods = (mode == _int);
1075 }
1076 #endif
1077
1078 // Default values may be platform/compiler dependent -
1079 // use the saved values
1080 ClipInlining = Arguments::_ClipInlining;
1081 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1082 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1083 BackgroundCompilation = Arguments::_BackgroundCompilation;
1084
1085 // Change from defaults based on mode
1086 switch (mode) {
1087 default:
1088 ShouldNotReachHere();
1089 break;
1090 case _int:
1091 UseCompiler = false;
1092 UseLoopCounter = false;
1093 AlwaysCompileLoopMethods = false;
1094 UseOnStackReplacement = false;
1095 break;
1096 case _mixed:
1097 // same as default
1098 break;
1099 case _comp:
1100 UseInterpreter = false;
1101 BackgroundCompilation = false;
1102 ClipInlining = false;
1103 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1104 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1105 // compile a level 4 (C2) and then continue executing it.
1106 if (TieredCompilation) {
1107 Tier3InvokeNotifyFreqLog = 0;
1108 Tier4InvocationThreshold = 0;
1109 }
1110 break;
1111 }
1112 }
1113
1114 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1115 // Conflict: required to use shared spaces (-Xshare:on), but
1116 // incompatible command line options were chosen.
1117
1118 static void no_shared_spaces(const char* message) {
1119 if (RequireSharedSpaces) {
1120 jio_fprintf(defaultStream::error_stream(),
1121 "Class data sharing is inconsistent with other specified options.\n");
1122 vm_exit_during_initialization("Unable to use shared archive.", message);
1123 } else {
1124 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1125 }
1126 }
1127 #endif
1128
1129 void Arguments::set_tiered_flags() {
1130 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1131 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1132 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1133 }
1134 if (CompilationPolicyChoice < 2) {
1135 vm_exit_during_initialization(
1136 "Incompatible compilation policy selected", NULL);
1137 }
1138 // Increase the code cache size - tiered compiles a lot more.
1139 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1140 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1141 }
1142 if (!UseInterpreter) { // -Xcomp
1143 Tier3InvokeNotifyFreqLog = 0;
1144 Tier4InvocationThreshold = 0;
1145 }
1146 }
1147
1148 /**
1149 * Returns the minimum number of compiler threads needed to run the JVM. The following
1150 * configurations are possible.
1151 *
1152 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1153 * compiler threads is 0.
1154 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1155 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1156 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1157 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1158 * C1 can be used, so the minimum number of compiler threads is 1.
1159 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1160 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1161 * the minimum number of compiler threads is 2.
1162 */
1163 int Arguments::get_min_number_of_compiler_threads() {
1164 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1165 return 0; // case 1
1166 #else
1167 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1168 return 1; // case 2 or case 3
1169 }
1170 return 2; // case 4 (tiered)
1171 #endif
1172 }
1173
1174 #if INCLUDE_ALL_GCS
1175 static void disable_adaptive_size_policy(const char* collector_name) {
1176 if (UseAdaptiveSizePolicy) {
1177 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1178 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1179 collector_name);
1180 }
1181 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1182 }
1183 }
1184
1185 void Arguments::set_parnew_gc_flags() {
1186 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1187 "control point invariant");
1188 assert(UseParNewGC, "Error");
1189
1190 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1191 disable_adaptive_size_policy("UseParNewGC");
1192
1193 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1194 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1195 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1196 } else if (ParallelGCThreads == 0) {
1197 jio_fprintf(defaultStream::error_stream(),
1198 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1199 vm_exit(1);
1200 }
1201
1202 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1203 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1204 // we set them to 1024 and 1024.
1205 // See CR 6362902.
1206 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1207 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1208 }
1209 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1210 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1211 }
1212
1213 // AlwaysTenure flag should make ParNew promote all at first collection.
1214 // See CR 6362902.
1215 if (AlwaysTenure) {
1216 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1217 }
1218 // When using compressed oops, we use local overflow stacks,
1219 // rather than using a global overflow list chained through
1220 // the klass word of the object's pre-image.
1221 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1222 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1223 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1224 }
1225 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1226 }
1227 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1228 }
1229
1230 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1231 // sparc/solaris for certain applications, but would gain from
1232 // further optimization and tuning efforts, and would almost
1233 // certainly gain from analysis of platform and environment.
1234 void Arguments::set_cms_and_parnew_gc_flags() {
1235 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1236 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1237
1238 // If we are using CMS, we prefer to UseParNewGC,
1239 // unless explicitly forbidden.
1240 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1241 FLAG_SET_ERGO(bool, UseParNewGC, true);
1242 }
1243
1244 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1245 disable_adaptive_size_policy("UseConcMarkSweepGC");
1246
1247 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1248 // as needed.
1249 if (UseParNewGC) {
1250 set_parnew_gc_flags();
1251 }
1252
1253 size_t max_heap = align_size_down(MaxHeapSize,
1254 CardTableRS::ct_max_alignment_constraint());
1255
1256 // Now make adjustments for CMS
1257 intx tenuring_default = (intx)6;
1258 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1259
1260 // Preferred young gen size for "short" pauses:
1261 // upper bound depends on # of threads and NewRatio.
1262 const uintx parallel_gc_threads =
1263 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1264 const size_t preferred_max_new_size_unaligned =
1265 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1266 size_t preferred_max_new_size =
1267 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1268
1269 // Unless explicitly requested otherwise, size young gen
1270 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1271
1272 // If either MaxNewSize or NewRatio is set on the command line,
1273 // assume the user is trying to set the size of the young gen.
1274 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1275
1276 // Set MaxNewSize to our calculated preferred_max_new_size unless
1277 // NewSize was set on the command line and it is larger than
1278 // preferred_max_new_size.
1279 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1280 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1281 } else {
1282 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1283 }
1284 if (PrintGCDetails && Verbose) {
1285 // Too early to use gclog_or_tty
1286 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1287 }
1288
1289 // Code along this path potentially sets NewSize and OldSize
1290 if (PrintGCDetails && Verbose) {
1291 // Too early to use gclog_or_tty
1292 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1293 " initial_heap_size: " SIZE_FORMAT
1294 " max_heap: " SIZE_FORMAT,
1295 min_heap_size(), InitialHeapSize, max_heap);
1296 }
1297 size_t min_new = preferred_max_new_size;
1298 if (FLAG_IS_CMDLINE(NewSize)) {
1299 min_new = NewSize;
1300 }
1301 if (max_heap > min_new && min_heap_size() > min_new) {
1302 // Unless explicitly requested otherwise, make young gen
1303 // at least min_new, and at most preferred_max_new_size.
1304 if (FLAG_IS_DEFAULT(NewSize)) {
1305 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1306 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1307 if (PrintGCDetails && Verbose) {
1308 // Too early to use gclog_or_tty
1309 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1310 }
1311 }
1312 // Unless explicitly requested otherwise, size old gen
1313 // so it's NewRatio x of NewSize.
1314 if (FLAG_IS_DEFAULT(OldSize)) {
1315 if (max_heap > NewSize) {
1316 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1317 if (PrintGCDetails && Verbose) {
1318 // Too early to use gclog_or_tty
1319 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1320 }
1321 }
1322 }
1323 }
1324 }
1325 // Unless explicitly requested otherwise, definitely
1326 // promote all objects surviving "tenuring_default" scavenges.
1327 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1328 FLAG_IS_DEFAULT(SurvivorRatio)) {
1329 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1330 }
1331 // If we decided above (or user explicitly requested)
1332 // `promote all' (via MaxTenuringThreshold := 0),
1333 // prefer minuscule survivor spaces so as not to waste
1334 // space for (non-existent) survivors
1335 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1336 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1337 }
1338 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1339 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1340 // This is done in order to make ParNew+CMS configuration to work
1341 // with YoungPLABSize and OldPLABSize options.
1342 // See CR 6362902.
1343 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1344 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1345 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1346 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1347 // the value (either from the command line or ergonomics) of
1348 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1349 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1350 } else {
1351 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1352 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1353 // we'll let it to take precedence.
1354 jio_fprintf(defaultStream::error_stream(),
1355 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1356 " options are specified for the CMS collector."
1357 " CMSParPromoteBlocksToClaim will take precedence.\n");
1358 }
1359 }
1360 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1361 // OldPLAB sizing manually turned off: Use a larger default setting,
1362 // unless it was manually specified. This is because a too-low value
1363 // will slow down scavenges.
1364 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1365 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1366 }
1367 }
1368 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1369 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1370 // If either of the static initialization defaults have changed, note this
1371 // modification.
1372 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1373 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1374 }
1375 if (PrintGCDetails && Verbose) {
1376 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1377 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1378 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1379 }
1380 }
1381 #endif // INCLUDE_ALL_GCS
1382
1383 void set_object_alignment() {
1384 // Object alignment.
1385 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1386 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1387 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1388 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1389 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1390 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1391
1392 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1393 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1394
1395 // Oop encoding heap max
1396 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1397
1398 #if INCLUDE_ALL_GCS
1399 // Set CMS global values
1400 CompactibleFreeListSpace::set_cms_values();
1401 #endif // INCLUDE_ALL_GCS
1402 }
1403
1404 bool verify_object_alignment() {
1405 // Object alignment.
1406 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1407 jio_fprintf(defaultStream::error_stream(),
1408 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1409 (int)ObjectAlignmentInBytes);
1410 return false;
1411 }
1412 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1413 jio_fprintf(defaultStream::error_stream(),
1414 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1415 (int)ObjectAlignmentInBytes, BytesPerLong);
1416 return false;
1417 }
1418 // It does not make sense to have big object alignment
1419 // since a space lost due to alignment will be greater
1420 // then a saved space from compressed oops.
1421 if ((int)ObjectAlignmentInBytes > 256) {
1422 jio_fprintf(defaultStream::error_stream(),
1423 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1424 (int)ObjectAlignmentInBytes);
1425 return false;
1426 }
1427 // In case page size is very small.
1428 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1429 jio_fprintf(defaultStream::error_stream(),
1430 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1431 (int)ObjectAlignmentInBytes, os::vm_page_size());
1432 return false;
1433 }
1434 if(SurvivorAlignmentInBytes == 0) {
1435 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1436 } else {
1437 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1438 jio_fprintf(defaultStream::error_stream(),
1439 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1440 (int)SurvivorAlignmentInBytes);
1441 return false;
1442 }
1443 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1444 jio_fprintf(defaultStream::error_stream(),
1445 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1446 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1447 return false;
1448 }
1449 }
1450 return true;
1451 }
1452
1453 size_t Arguments::max_heap_for_compressed_oops() {
1454 // Avoid sign flip.
1455 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1456 // We need to fit both the NULL page and the heap into the memory budget, while
1457 // keeping alignment constraints of the heap. To guarantee the latter, as the
1458 // NULL page is located before the heap, we pad the NULL page to the conservative
1459 // maximum alignment that the GC may ever impose upon the heap.
1460 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1461 _conservative_max_heap_alignment);
1462
1463 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1464 NOT_LP64(ShouldNotReachHere(); return 0);
1465 }
1466
1467 bool Arguments::should_auto_select_low_pause_collector() {
1468 if (UseAutoGCSelectPolicy &&
1469 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1470 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1471 if (PrintGCDetails) {
1472 // Cannot use gclog_or_tty yet.
1473 tty->print_cr("Automatic selection of the low pause collector"
1474 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1475 }
1476 return true;
1477 }
1478 return false;
1479 }
1480
1481 void Arguments::set_use_compressed_oops() {
1482 #ifndef ZERO
1483 #ifdef _LP64
1484 // MaxHeapSize is not set up properly at this point, but
1485 // the only value that can override MaxHeapSize if we are
1486 // to use UseCompressedOops is InitialHeapSize.
1487 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1488
1489 if (max_heap_size <= max_heap_for_compressed_oops()) {
1490 #if !defined(COMPILER1) || defined(TIERED)
1491 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1492 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1493 }
1494 #endif
1495 #ifdef _WIN64
1496 if (UseLargePages && UseCompressedOops) {
1497 // Cannot allocate guard pages for implicit checks in indexed addressing
1498 // mode, when large pages are specified on windows.
1499 // This flag could be switched ON if narrow oop base address is set to 0,
1500 // see code in Universe::initialize_heap().
1501 Universe::set_narrow_oop_use_implicit_null_checks(false);
1502 }
1503 #endif // _WIN64
1504 } else {
1505 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1506 warning("Max heap size too large for Compressed Oops");
1507 FLAG_SET_DEFAULT(UseCompressedOops, false);
1508 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1509 }
1510 }
1511 #endif // _LP64
1512 #endif // ZERO
1513 }
1514
1515
1516 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1517 // set_use_compressed_oops().
1518 void Arguments::set_use_compressed_klass_ptrs() {
1519 #ifndef ZERO
1520 #ifdef _LP64
1521 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1522 if (!UseCompressedOops) {
1523 if (UseCompressedClassPointers) {
1524 warning("UseCompressedClassPointers requires UseCompressedOops");
1525 }
1526 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1527 } else {
1528 // Turn on UseCompressedClassPointers too
1529 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1530 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1531 }
1532 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1533 if (UseCompressedClassPointers) {
1534 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1535 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1536 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1537 }
1538 }
1539 }
1540 #endif // _LP64
1541 #endif // !ZERO
1542 }
1543
1544 void Arguments::set_conservative_max_heap_alignment() {
1545 // The conservative maximum required alignment for the heap is the maximum of
1546 // the alignments imposed by several sources: any requirements from the heap
1547 // itself, the collector policy and the maximum page size we may run the VM
1548 // with.
1549 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1550 #if INCLUDE_ALL_GCS
1551 if (UseParallelGC) {
1552 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1553 } else if (UseG1GC) {
1554 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1555 }
1556 #endif // INCLUDE_ALL_GCS
1557 _conservative_max_heap_alignment = MAX4(heap_alignment,
1558 (size_t)os::vm_allocation_granularity(),
1559 os::max_page_size(),
1560 CollectorPolicy::compute_heap_alignment());
1561 }
1562
1563 void Arguments::select_gc_ergonomically() {
1564 if (os::is_server_class_machine()) {
1565 if (should_auto_select_low_pause_collector()) {
1566 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1567 } else {
1568 FLAG_SET_ERGO(bool, UseParallelGC, true);
1569 }
1570 }
1571 }
1572
1573 void Arguments::select_gc() {
1574 if (!gc_selected()) {
1575 ArgumentsExt::select_gc_ergonomically();
1576 }
1577 }
1578
1579 void Arguments::set_ergonomics_flags() {
1580 select_gc();
1581
1582 #ifdef COMPILER2
1583 // Shared spaces work fine with other GCs but causes bytecode rewriting
1584 // to be disabled, which hurts interpreter performance and decreases
1585 // server performance. When -server is specified, keep the default off
1586 // unless it is asked for. Future work: either add bytecode rewriting
1587 // at link time, or rewrite bytecodes in non-shared methods.
1588 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1589 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1590 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1591 }
1592 #endif
1593
1594 set_conservative_max_heap_alignment();
1595
1596 #ifndef ZERO
1597 #ifdef _LP64
1598 set_use_compressed_oops();
1599
1600 // set_use_compressed_klass_ptrs() must be called after calling
1601 // set_use_compressed_oops().
1602 set_use_compressed_klass_ptrs();
1603
1604 // Also checks that certain machines are slower with compressed oops
1605 // in vm_version initialization code.
1606 #endif // _LP64
1607 #endif // !ZERO
1608 }
1609
1610 void Arguments::set_parallel_gc_flags() {
1611 assert(UseParallelGC || UseParallelOldGC, "Error");
1612 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1613 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1614 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1615 }
1616 FLAG_SET_DEFAULT(UseParallelGC, true);
1617
1618 // If no heap maximum was requested explicitly, use some reasonable fraction
1619 // of the physical memory, up to a maximum of 1GB.
1620 FLAG_SET_DEFAULT(ParallelGCThreads,
1621 Abstract_VM_Version::parallel_worker_threads());
1622 if (ParallelGCThreads == 0) {
1623 jio_fprintf(defaultStream::error_stream(),
1624 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1625 vm_exit(1);
1626 }
1627
1628 if (UseAdaptiveSizePolicy) {
1629 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1630 // unless the user actually sets these flags.
1631 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1632 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1633 _min_heap_free_ratio = MinHeapFreeRatio;
1634 }
1635 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1636 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1637 _max_heap_free_ratio = MaxHeapFreeRatio;
1638 }
1639 }
1640
1641 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1642 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1643 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1644 // See CR 6362902 for details.
1645 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1646 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1647 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1648 }
1649 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1650 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1651 }
1652 }
1653
1654 if (UseParallelOldGC) {
1655 // Par compact uses lower default values since they are treated as
1656 // minimums. These are different defaults because of the different
1657 // interpretation and are not ergonomically set.
1658 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1659 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1660 }
1661 }
1662 }
1663
1664 void Arguments::set_g1_gc_flags() {
1665 assert(UseG1GC, "Error");
1666 #ifdef COMPILER1
1667 FastTLABRefill = false;
1668 #endif
1669 FLAG_SET_DEFAULT(ParallelGCThreads,
1670 Abstract_VM_Version::parallel_worker_threads());
1671 if (ParallelGCThreads == 0) {
1672 FLAG_SET_DEFAULT(ParallelGCThreads,
1673 Abstract_VM_Version::parallel_worker_threads());
1674 }
1675
1676 #if INCLUDE_ALL_GCS
1677 if (G1ConcRefinementThreads == 0) {
1678 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1679 }
1680 #endif
1681
1682 // MarkStackSize will be set (if it hasn't been set by the user)
1683 // when concurrent marking is initialized.
1684 // Its value will be based upon the number of parallel marking threads.
1685 // But we do set the maximum mark stack size here.
1686 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1687 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1688 }
1689
1690 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1691 // In G1, we want the default GC overhead goal to be higher than
1692 // say in PS. So we set it here to 10%. Otherwise the heap might
1693 // be expanded more aggressively than we would like it to. In
1694 // fact, even 10% seems to not be high enough in some cases
1695 // (especially small GC stress tests that the main thing they do
1696 // is allocation). We might consider increase it further.
1697 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1698 }
1699
1700 if (PrintGCDetails && Verbose) {
1701 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1702 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1703 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1704 }
1705 }
1706
1707 #if !INCLUDE_ALL_GCS
1708 #ifdef ASSERT
1709 static bool verify_serial_gc_flags() {
1710 return (UseSerialGC &&
1711 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1712 UseParallelGC || UseParallelOldGC));
1713 }
1714 #endif // ASSERT
1715 #endif // INCLUDE_ALL_GCS
1716
1717 void Arguments::set_gc_specific_flags() {
1718 #if INCLUDE_ALL_GCS
1719 // Set per-collector flags
1720 if (UseParallelGC || UseParallelOldGC) {
1721 set_parallel_gc_flags();
1722 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1723 set_cms_and_parnew_gc_flags();
1724 } else if (UseParNewGC) { // Skipped if CMS is set above
1725 set_parnew_gc_flags();
1726 } else if (UseG1GC) {
1727 set_g1_gc_flags();
1728 }
1729 check_deprecated_gcs();
1730 check_deprecated_gc_flags();
1731 if (AssumeMP && !UseSerialGC) {
1732 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1733 warning("If the number of processors is expected to increase from one, then"
1734 " you should configure the number of parallel GC threads appropriately"
1735 " using -XX:ParallelGCThreads=N");
1736 }
1737 }
1738 if (MinHeapFreeRatio == 100) {
1739 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1740 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1741 }
1742 #else // INCLUDE_ALL_GCS
1743 assert(verify_serial_gc_flags(), "SerialGC unset");
1744 #endif // INCLUDE_ALL_GCS
1745 }
1746
1747 julong Arguments::limit_by_allocatable_memory(julong limit) {
1748 julong max_allocatable;
1749 julong result = limit;
1750 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1751 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1752 }
1753 return result;
1754 }
1755
1756 void Arguments::set_heap_size() {
1757 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1758 // Deprecated flag
1759 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1760 }
1761
1762 const julong phys_mem =
1763 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1764 : (julong)MaxRAM;
1765
1766 // If the maximum heap size has not been set with -Xmx,
1767 // then set it as fraction of the size of physical memory,
1768 // respecting the maximum and minimum sizes of the heap.
1769 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1770 julong reasonable_max = phys_mem / MaxRAMFraction;
1771
1772 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1773 // Small physical memory, so use a minimum fraction of it for the heap
1774 reasonable_max = phys_mem / MinRAMFraction;
1775 } else {
1776 // Not-small physical memory, so require a heap at least
1777 // as large as MaxHeapSize
1778 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1779 }
1780 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1781 // Limit the heap size to ErgoHeapSizeLimit
1782 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1783 }
1784 if (UseCompressedOops) {
1785 // Limit the heap size to the maximum possible when using compressed oops
1786 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1787 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1788 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1789 // but it should be not less than default MaxHeapSize.
1790 max_coop_heap -= HeapBaseMinAddress;
1791 }
1792 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1793 }
1794 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1795
1796 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1797 // An initial heap size was specified on the command line,
1798 // so be sure that the maximum size is consistent. Done
1799 // after call to limit_by_allocatable_memory because that
1800 // method might reduce the allocation size.
1801 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1802 }
1803
1804 if (PrintGCDetails && Verbose) {
1805 // Cannot use gclog_or_tty yet.
1806 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1807 }
1808 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1809 }
1810
1811 // If the minimum or initial heap_size have not been set or requested to be set
1812 // ergonomically, set them accordingly.
1813 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1814 julong reasonable_minimum = (julong)(OldSize + NewSize);
1815
1816 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1817
1818 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1819
1820 if (InitialHeapSize == 0) {
1821 julong reasonable_initial = phys_mem / InitialRAMFraction;
1822
1823 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1824 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1825
1826 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1827
1828 if (PrintGCDetails && Verbose) {
1829 // Cannot use gclog_or_tty yet.
1830 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1831 }
1832 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1833 }
1834 // If the minimum heap size has not been set (via -Xms),
1835 // synchronize with InitialHeapSize to avoid errors with the default value.
1836 if (min_heap_size() == 0) {
1837 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1838 if (PrintGCDetails && Verbose) {
1839 // Cannot use gclog_or_tty yet.
1840 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1841 }
1842 }
1843 }
1844 }
1845
1846 // This must be called after ergonomics because we want bytecode rewriting
1847 // if the server compiler is used, or if UseSharedSpaces is disabled.
1848 void Arguments::set_bytecode_flags() {
1849 // Better not attempt to store into a read-only space.
1850 if (UseSharedSpaces) {
1851 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1852 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1853 }
1854
1855 if (!RewriteBytecodes) {
1856 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1857 }
1858 }
1859
1860 // Aggressive optimization flags -XX:+AggressiveOpts
1861 void Arguments::set_aggressive_opts_flags() {
1862 #ifdef COMPILER2
1863 if (AggressiveUnboxing) {
1864 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1865 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1866 } else if (!EliminateAutoBox) {
1867 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1868 AggressiveUnboxing = false;
1869 }
1870 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1871 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1872 } else if (!DoEscapeAnalysis) {
1873 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1874 AggressiveUnboxing = false;
1875 }
1876 }
1877 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1878 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1879 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1880 }
1881 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1882 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1883 }
1884
1885 // Feed the cache size setting into the JDK
1886 char buffer[1024];
1887 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1888 add_property(buffer);
1889 }
1890 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1891 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1892 }
1893 #endif
1894
1895 if (AggressiveOpts) {
1896 // Sample flag setting code
1897 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1898 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1899 // }
1900 }
1901 }
1902
1903 //===========================================================================================================
1904 // Parsing of java.compiler property
1905
1906 void Arguments::process_java_compiler_argument(char* arg) {
1907 // For backwards compatibility, Djava.compiler=NONE or ""
1908 // causes us to switch to -Xint mode UNLESS -Xdebug
1909 // is also specified.
1910 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1911 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1912 }
1913 }
1914
1915 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1916 _sun_java_launcher = strdup(launcher);
1917 if (strcmp("gamma", _sun_java_launcher) == 0) {
1918 _created_by_gamma_launcher = true;
1919 }
1920 }
1921
1922 bool Arguments::created_by_java_launcher() {
1923 assert(_sun_java_launcher != NULL, "property must have value");
1924 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1925 }
1926
1927 bool Arguments::created_by_gamma_launcher() {
1928 return _created_by_gamma_launcher;
1929 }
1930
1931 //===========================================================================================================
1932 // Parsing of main arguments
1933
1934 bool Arguments::verify_interval(uintx val, uintx min,
1935 uintx max, const char* name) {
1936 // Returns true iff value is in the inclusive interval [min..max]
1937 // false, otherwise.
1938 if (val >= min && val <= max) {
1939 return true;
1940 }
1941 jio_fprintf(defaultStream::error_stream(),
1942 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1943 " and " UINTX_FORMAT "\n",
1944 name, val, min, max);
1945 return false;
1946 }
1947
1948 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1949 // Returns true if given value is at least specified min threshold
1950 // false, otherwise.
1951 if (val >= min ) {
1952 return true;
1953 }
1954 jio_fprintf(defaultStream::error_stream(),
1955 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1956 name, val, min);
1957 return false;
1958 }
1959
1960 bool Arguments::verify_percentage(uintx value, const char* name) {
1961 if (is_percentage(value)) {
1962 return true;
1963 }
1964 jio_fprintf(defaultStream::error_stream(),
1965 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1966 name, value);
1967 return false;
1968 }
1969
1970 // check if do gclog rotation
1971 // +UseGCLogFileRotation is a must,
1972 // no gc log rotation when log file not supplied or
1973 // NumberOfGCLogFiles is 0
1974 void check_gclog_consistency() {
1975 if (UseGCLogFileRotation) {
1976 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1977 jio_fprintf(defaultStream::output_stream(),
1978 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1979 "where num_of_file > 0\n"
1980 "GC log rotation is turned off\n");
1981 UseGCLogFileRotation = false;
1982 }
1983 }
1984
1985 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1986 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1987 jio_fprintf(defaultStream::output_stream(),
1988 "GCLogFileSize changed to minimum 8K\n");
1989 }
1990 }
1991
1992 // This function is called for -Xloggc:<filename>, it can be used
1993 // to check if a given file name(or string) conforms to the following
1994 // specification:
1995 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1996 // %p and %t only allowed once. We only limit usage of filename not path
1997 bool is_filename_valid(const char *file_name) {
1998 const char* p = file_name;
1999 char file_sep = os::file_separator()[0];
2000 const char* cp;
2001 // skip prefix path
2002 for (cp = file_name; *cp != '\0'; cp++) {
2003 if (*cp == '/' || *cp == file_sep) {
2004 p = cp + 1;
2005 }
2006 }
2007
2008 int count_p = 0;
2009 int count_t = 0;
2010 while (*p != '\0') {
2011 if ((*p >= '0' && *p <= '9') ||
2012 (*p >= 'A' && *p <= 'Z') ||
2013 (*p >= 'a' && *p <= 'z') ||
2014 *p == '-' ||
2015 *p == '_' ||
2016 *p == '.') {
2017 p++;
2018 continue;
2019 }
2020 if (*p == '%') {
2021 if(*(p + 1) == 'p') {
2022 p += 2;
2023 count_p ++;
2024 continue;
2025 }
2026 if (*(p + 1) == 't') {
2027 p += 2;
2028 count_t ++;
2029 continue;
2030 }
2031 }
2032 return false;
2033 }
2034 return count_p < 2 && count_t < 2;
2035 }
2036
2037 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2038 if (!is_percentage(min_heap_free_ratio)) {
2039 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2040 return false;
2041 }
2042 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2043 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2044 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2045 MaxHeapFreeRatio);
2046 return false;
2047 }
2048 // This does not set the flag itself, but stores the value in a safe place for later usage.
2049 _min_heap_free_ratio = min_heap_free_ratio;
2050 return true;
2051 }
2052
2053 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2054 if (!is_percentage(max_heap_free_ratio)) {
2055 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2056 return false;
2057 }
2058 if (max_heap_free_ratio < MinHeapFreeRatio) {
2059 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2060 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2061 MinHeapFreeRatio);
2062 return false;
2063 }
2064 // This does not set the flag itself, but stores the value in a safe place for later usage.
2065 _max_heap_free_ratio = max_heap_free_ratio;
2066 return true;
2067 }
2068
2069 // Check consistency of GC selection
2070 bool Arguments::check_gc_consistency_user() {
2071 check_gclog_consistency();
2072 bool status = true;
2073 // Ensure that the user has not selected conflicting sets
2074 // of collectors. [Note: this check is merely a user convenience;
2075 // collectors over-ride each other so that only a non-conflicting
2076 // set is selected; however what the user gets is not what they
2077 // may have expected from the combination they asked for. It's
2078 // better to reduce user confusion by not allowing them to
2079 // select conflicting combinations.
2080 uint i = 0;
2081 if (UseSerialGC) i++;
2082 if (UseConcMarkSweepGC || UseParNewGC) i++;
2083 if (UseParallelGC || UseParallelOldGC) i++;
2084 if (UseG1GC) i++;
2085 if (i > 1) {
2086 jio_fprintf(defaultStream::error_stream(),
2087 "Conflicting collector combinations in option list; "
2088 "please refer to the release notes for the combinations "
2089 "allowed\n");
2090 status = false;
2091 }
2092 return status;
2093 }
2094
2095 void Arguments::check_deprecated_gcs() {
2096 if (UseConcMarkSweepGC && !UseParNewGC) {
2097 warning("Using the DefNew young collector with the CMS collector is deprecated "
2098 "and will likely be removed in a future release");
2099 }
2100
2101 if (UseParNewGC && !UseConcMarkSweepGC) {
2102 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2103 // set up UseSerialGC properly, so that can't be used in the check here.
2104 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2105 "and will likely be removed in a future release");
2106 }
2107
2108 if (CMSIncrementalMode) {
2109 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2110 }
2111 }
2112
2113 void Arguments::check_deprecated_gc_flags() {
2114 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2115 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2116 "and will likely be removed in future release");
2117 }
2118 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2119 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2120 "Use MaxRAMFraction instead.");
2121 }
2122 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2123 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2124 }
2125 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2126 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2127 }
2128 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2129 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2130 }
2131 }
2132
2133 // Check stack pages settings
2134 bool Arguments::check_stack_pages()
2135 {
2136 bool status = true;
2137 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2138 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2139 // greater stack shadow pages can't generate instruction to bang stack
2140 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2141 return status;
2142 }
2143
2144 // Check the consistency of vm_init_args
2145 bool Arguments::check_vm_args_consistency() {
2146 // Method for adding checks for flag consistency.
2147 // The intent is to warn the user of all possible conflicts,
2148 // before returning an error.
2149 // Note: Needs platform-dependent factoring.
2150 bool status = true;
2151
2152 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2153 // builds so the cost of stack banging can be measured.
2154 #if (defined(PRODUCT) && defined(SOLARIS))
2155 if (!UseBoundThreads && !UseStackBanging) {
2156 jio_fprintf(defaultStream::error_stream(),
2157 "-UseStackBanging conflicts with -UseBoundThreads\n");
2158
2159 status = false;
2160 }
2161 #endif
2162
2163 if (TLABRefillWasteFraction == 0) {
2164 jio_fprintf(defaultStream::error_stream(),
2165 "TLABRefillWasteFraction should be a denominator, "
2166 "not " SIZE_FORMAT "\n",
2167 TLABRefillWasteFraction);
2168 status = false;
2169 }
2170
2171 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2172 "AdaptiveSizePolicyWeight");
2173 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2174
2175 // Divide by bucket size to prevent a large size from causing rollover when
2176 // calculating amount of memory needed to be allocated for the String table.
2177 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2178 (max_uintx / StringTable::bucket_size()), "StringTable size");
2179
2180 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2181 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2182
2183 {
2184 // Using "else if" below to avoid printing two error messages if min > max.
2185 // This will also prevent us from reporting both min>100 and max>100 at the
2186 // same time, but that is less annoying than printing two identical errors IMHO.
2187 FormatBuffer<80> err_msg("%s","");
2188 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2189 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2190 status = false;
2191 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2192 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2193 status = false;
2194 }
2195 }
2196
2197 // Min/MaxMetaspaceFreeRatio
2198 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2199 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2200
2201 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2202 jio_fprintf(defaultStream::error_stream(),
2203 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2204 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2205 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2206 MinMetaspaceFreeRatio,
2207 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2208 MaxMetaspaceFreeRatio);
2209 status = false;
2210 }
2211
2212 // Trying to keep 100% free is not practical
2213 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2214
2215 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2216 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2217 }
2218
2219 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2220 // Settings to encourage splitting.
2221 if (!FLAG_IS_CMDLINE(NewRatio)) {
2222 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2223 }
2224 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2225 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2226 }
2227 }
2228
2229 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2230 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2231 if (GCTimeLimit == 100) {
2232 // Turn off gc-overhead-limit-exceeded checks
2233 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2234 }
2235
2236 status = status && ArgumentsExt::check_gc_consistency_user();
2237 status = status && check_stack_pages();
2238
2239 if (CMSIncrementalMode) {
2240 if (!UseConcMarkSweepGC) {
2241 jio_fprintf(defaultStream::error_stream(),
2242 "error: invalid argument combination.\n"
2243 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2244 "selected in order\nto use CMSIncrementalMode.\n");
2245 status = false;
2246 } else {
2247 status = status && verify_percentage(CMSIncrementalDutyCycle,
2248 "CMSIncrementalDutyCycle");
2249 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2250 "CMSIncrementalDutyCycleMin");
2251 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2252 "CMSIncrementalSafetyFactor");
2253 status = status && verify_percentage(CMSIncrementalOffset,
2254 "CMSIncrementalOffset");
2255 status = status && verify_percentage(CMSExpAvgFactor,
2256 "CMSExpAvgFactor");
2257 // If it was not set on the command line, set
2258 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2259 if (CMSInitiatingOccupancyFraction < 0) {
2260 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2261 }
2262 }
2263 }
2264
2265 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2266 // insists that we hold the requisite locks so that the iteration is
2267 // MT-safe. For the verification at start-up and shut-down, we don't
2268 // yet have a good way of acquiring and releasing these locks,
2269 // which are not visible at the CollectedHeap level. We want to
2270 // be able to acquire these locks and then do the iteration rather
2271 // than just disable the lock verification. This will be fixed under
2272 // bug 4788986.
2273 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2274 if (VerifyDuringStartup) {
2275 warning("Heap verification at start-up disabled "
2276 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2277 VerifyDuringStartup = false; // Disable verification at start-up
2278 }
2279
2280 if (VerifyBeforeExit) {
2281 warning("Heap verification at shutdown disabled "
2282 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2283 VerifyBeforeExit = false; // Disable verification at shutdown
2284 }
2285 }
2286
2287 // Note: only executed in non-PRODUCT mode
2288 if (!UseAsyncConcMarkSweepGC &&
2289 (ExplicitGCInvokesConcurrent ||
2290 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2291 jio_fprintf(defaultStream::error_stream(),
2292 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2293 " with -UseAsyncConcMarkSweepGC");
2294 status = false;
2295 }
2296
2297 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2298
2299 #if INCLUDE_ALL_GCS
2300 if (UseG1GC) {
2301 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2302 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2303 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2304
2305 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2306 "InitiatingHeapOccupancyPercent");
2307 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2308 "G1RefProcDrainInterval");
2309 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2310 "G1ConcMarkStepDurationMillis");
2311 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2312 "G1ConcRSHotCardLimit");
2313 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2314 "G1ConcRSLogCacheSize");
2315 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2316 "StringDeduplicationAgeThreshold");
2317 }
2318 if (UseConcMarkSweepGC) {
2319 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2320 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2321 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2322 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2323
2324 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2325
2326 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2327 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2328 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2329
2330 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2331
2332 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2333 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2334
2335 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2336 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2337 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2338
2339 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2340
2341 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2342
2343 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2344 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2345 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2346 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2347 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2348 }
2349
2350 if (UseParallelGC || UseParallelOldGC) {
2351 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2352 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2353
2354 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2355 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2356
2357 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2358 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2359
2360 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2361
2362 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2363 }
2364 #endif // INCLUDE_ALL_GCS
2365
2366 status = status && verify_interval(RefDiscoveryPolicy,
2367 ReferenceProcessor::DiscoveryPolicyMin,
2368 ReferenceProcessor::DiscoveryPolicyMax,
2369 "RefDiscoveryPolicy");
2370
2371 // Limit the lower bound of this flag to 1 as it is used in a division
2372 // expression.
2373 status = status && verify_interval(TLABWasteTargetPercent,
2374 1, 100, "TLABWasteTargetPercent");
2375
2376 status = status && verify_object_alignment();
2377
2378 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2379 "CompressedClassSpaceSize");
2380
2381 status = status && verify_interval(MarkStackSizeMax,
2382 1, (max_jint - 1), "MarkStackSizeMax");
2383 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2384
2385 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2386
2387 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2388
2389 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2390
2391 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2392 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2393
2394 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2395
2396 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2397 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2398 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2399 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2400
2401 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2402 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2403
2404 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2405 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2406 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2407
2408 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2409 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2410
2411 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2412 // just for that, so hardcode here.
2413 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2414 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2415 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2416 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2417
2418 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2419 #ifdef COMPILER1
2420 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2421 #endif
2422
2423 if (PrintNMTStatistics) {
2424 #if INCLUDE_NMT
2425 if (MemTracker::tracking_level() == NMT_off) {
2426 #endif // INCLUDE_NMT
2427 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2428 PrintNMTStatistics = false;
2429 #if INCLUDE_NMT
2430 }
2431 #endif
2432 }
2433
2434 // Need to limit the extent of the padding to reasonable size.
2435 // 8K is well beyond the reasonable HW cache line size, even with the
2436 // aggressive prefetching, while still leaving the room for segregating
2437 // among the distinct pages.
2438 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2439 jio_fprintf(defaultStream::error_stream(),
2440 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2441 ContendedPaddingWidth, 0, 8192);
2442 status = false;
2443 }
2444
2445 // Need to enforce the padding not to break the existing field alignments.
2446 // It is sufficient to check against the largest type size.
2447 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2448 jio_fprintf(defaultStream::error_stream(),
2449 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2450 ContendedPaddingWidth, BytesPerLong);
2451 status = false;
2452 }
2453
2454 // Check lower bounds of the code cache
2455 // Template Interpreter code is approximately 3X larger in debug builds.
2456 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2457 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2458 jio_fprintf(defaultStream::error_stream(),
2459 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2460 os::vm_page_size()/K);
2461 status = false;
2462 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2463 jio_fprintf(defaultStream::error_stream(),
2464 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2465 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2466 status = false;
2467 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2468 jio_fprintf(defaultStream::error_stream(),
2469 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2470 min_code_cache_size/K);
2471 status = false;
2472 } else if (ReservedCodeCacheSize > 2*G) {
2473 // Code cache size larger than MAXINT is not supported.
2474 jio_fprintf(defaultStream::error_stream(),
2475 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2476 (2*G)/M);
2477 status = false;
2478 }
2479
2480 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2481 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2482
2483 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2484 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2485 }
2486
2487 #ifdef COMPILER1
2488 status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
2489 #endif
2490
2491 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2492 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2493 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2494 // Check the minimum number of compiler threads
2495 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2496
2497 return status;
2498 }
2499
2500 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2501 const char* option_type) {
2502 if (ignore) return false;
2503
2504 const char* spacer = " ";
2505 if (option_type == NULL) {
2506 option_type = ++spacer; // Set both to the empty string.
2507 }
2508
2509 if (os::obsolete_option(option)) {
2510 jio_fprintf(defaultStream::error_stream(),
2511 "Obsolete %s%soption: %s\n", option_type, spacer,
2512 option->optionString);
2513 return false;
2514 } else {
2515 jio_fprintf(defaultStream::error_stream(),
2516 "Unrecognized %s%soption: %s\n", option_type, spacer,
2517 option->optionString);
2518 return true;
2519 }
2520 }
2521
2522 static const char* user_assertion_options[] = {
2523 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2524 };
2525
2526 static const char* system_assertion_options[] = {
2527 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2528 };
2529
2530 // Return true if any of the strings in null-terminated array 'names' matches.
2531 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2532 // the option must match exactly.
2533 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2534 bool tail_allowed) {
2535 for (/* empty */; *names != NULL; ++names) {
2536 if (match_option(option, *names, tail)) {
2537 if (**tail == '\0' || tail_allowed && **tail == ':') {
2538 return true;
2539 }
2540 }
2541 }
2542 return false;
2543 }
2544
2545 bool Arguments::parse_uintx(const char* value,
2546 uintx* uintx_arg,
2547 uintx min_size) {
2548
2549 // Check the sign first since atomull() parses only unsigned values.
2550 bool value_is_positive = !(*value == '-');
2551
2552 if (value_is_positive) {
2553 julong n;
2554 bool good_return = atomull(value, &n);
2555 if (good_return) {
2556 bool above_minimum = n >= min_size;
2557 bool value_is_too_large = n > max_uintx;
2558
2559 if (above_minimum && !value_is_too_large) {
2560 *uintx_arg = n;
2561 return true;
2562 }
2563 }
2564 }
2565 return false;
2566 }
2567
2568 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2569 julong* long_arg,
2570 julong min_size) {
2571 if (!atomull(s, long_arg)) return arg_unreadable;
2572 return check_memory_size(*long_arg, min_size);
2573 }
2574
2575 // Parse JavaVMInitArgs structure
2576
2577 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2578 // For components of the system classpath.
2579 SysClassPath scp(Arguments::get_sysclasspath());
2580 bool scp_assembly_required = false;
2581
2582 // Save default settings for some mode flags
2583 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2584 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2585 Arguments::_ClipInlining = ClipInlining;
2586 Arguments::_BackgroundCompilation = BackgroundCompilation;
2587
2588 // Setup flags for mixed which is the default
2589 set_mode_flags(_mixed);
2590
2591 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2592 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2593 if (result != JNI_OK) {
2594 return result;
2595 }
2596
2597 // Parse JavaVMInitArgs structure passed in
2598 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2599 if (result != JNI_OK) {
2600 return result;
2601 }
2602
2603 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2604 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2605 if (result != JNI_OK) {
2606 return result;
2607 }
2608
2609 // Do final processing now that all arguments have been parsed
2610 result = finalize_vm_init_args(&scp, scp_assembly_required);
2611 if (result != JNI_OK) {
2612 return result;
2613 }
2614
2615 return JNI_OK;
2616 }
2617
2618 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2619 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2620 // are dealing with -agentpath (case where name is a path), otherwise with
2621 // -agentlib
2622 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2623 char *_name;
2624 const char *_hprof = "hprof", *_jdwp = "jdwp";
2625 size_t _len_hprof, _len_jdwp, _len_prefix;
2626
2627 if (is_path) {
2628 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2629 return false;
2630 }
2631
2632 _name++; // skip past last path separator
2633 _len_prefix = strlen(JNI_LIB_PREFIX);
2634
2635 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2636 return false;
2637 }
2638
2639 _name += _len_prefix;
2640 _len_hprof = strlen(_hprof);
2641 _len_jdwp = strlen(_jdwp);
2642
2643 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2644 _name += _len_hprof;
2645 }
2646 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2647 _name += _len_jdwp;
2648 }
2649 else {
2650 return false;
2651 }
2652
2653 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2654 return false;
2655 }
2656
2657 return true;
2658 }
2659
2660 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2661 return true;
2662 }
2663
2664 return false;
2665 }
2666
2667 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2668 SysClassPath* scp_p,
2669 bool* scp_assembly_required_p,
2670 Flag::Flags origin) {
2671 // Remaining part of option string
2672 const char* tail;
2673
2674 // iterate over arguments
2675 for (int index = 0; index < args->nOptions; index++) {
2676 bool is_absolute_path = false; // for -agentpath vs -agentlib
2677
2678 const JavaVMOption* option = args->options + index;
2679
2680 if (!match_option(option, "-Djava.class.path", &tail) &&
2681 !match_option(option, "-Dsun.java.command", &tail) &&
2682 !match_option(option, "-Dsun.java.launcher", &tail)) {
2683
2684 // add all jvm options to the jvm_args string. This string
2685 // is used later to set the java.vm.args PerfData string constant.
2686 // the -Djava.class.path and the -Dsun.java.command options are
2687 // omitted from jvm_args string as each have their own PerfData
2688 // string constant object.
2689 build_jvm_args(option->optionString);
2690 }
2691
2692 // -verbose:[class/gc/jni]
2693 if (match_option(option, "-verbose", &tail)) {
2694 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2695 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2696 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2697 } else if (!strcmp(tail, ":gc")) {
2698 FLAG_SET_CMDLINE(bool, PrintGC, true);
2699 } else if (!strcmp(tail, ":jni")) {
2700 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2701 }
2702 // -da / -ea / -disableassertions / -enableassertions
2703 // These accept an optional class/package name separated by a colon, e.g.,
2704 // -da:java.lang.Thread.
2705 } else if (match_option(option, user_assertion_options, &tail, true)) {
2706 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2707 if (*tail == '\0') {
2708 JavaAssertions::setUserClassDefault(enable);
2709 } else {
2710 assert(*tail == ':', "bogus match by match_option()");
2711 JavaAssertions::addOption(tail + 1, enable);
2712 }
2713 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2714 } else if (match_option(option, system_assertion_options, &tail, false)) {
2715 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2716 JavaAssertions::setSystemClassDefault(enable);
2717 // -bootclasspath:
2718 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2719 scp_p->reset_path(tail);
2720 *scp_assembly_required_p = true;
2721 // -bootclasspath/a:
2722 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2723 scp_p->add_suffix(tail);
2724 *scp_assembly_required_p = true;
2725 // -bootclasspath/p:
2726 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2727 scp_p->add_prefix(tail);
2728 *scp_assembly_required_p = true;
2729 // -Xrun
2730 } else if (match_option(option, "-Xrun", &tail)) {
2731 if (tail != NULL) {
2732 const char* pos = strchr(tail, ':');
2733 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2734 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2735 name[len] = '\0';
2736
2737 char *options = NULL;
2738 if(pos != NULL) {
2739 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2740 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2741 }
2742 #if !INCLUDE_JVMTI
2743 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2744 jio_fprintf(defaultStream::error_stream(),
2745 "Profiling and debugging agents are not supported in this VM\n");
2746 return JNI_ERR;
2747 }
2748 #endif // !INCLUDE_JVMTI
2749 add_init_library(name, options);
2750 }
2751 // -agentlib and -agentpath
2752 } else if (match_option(option, "-agentlib:", &tail) ||
2753 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2754 if(tail != NULL) {
2755 const char* pos = strchr(tail, '=');
2756 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2757 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2758 name[len] = '\0';
2759
2760 char *options = NULL;
2761 if(pos != NULL) {
2762 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2763 }
2764 #if !INCLUDE_JVMTI
2765 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2766 jio_fprintf(defaultStream::error_stream(),
2767 "Profiling and debugging agents are not supported in this VM\n");
2768 return JNI_ERR;
2769 }
2770 #endif // !INCLUDE_JVMTI
2771 add_init_agent(name, options, is_absolute_path);
2772 }
2773 // -javaagent
2774 } else if (match_option(option, "-javaagent:", &tail)) {
2775 #if !INCLUDE_JVMTI
2776 jio_fprintf(defaultStream::error_stream(),
2777 "Instrumentation agents are not supported in this VM\n");
2778 return JNI_ERR;
2779 #else
2780 if(tail != NULL) {
2781 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2782 add_init_agent("instrument", options, false);
2783 }
2784 #endif // !INCLUDE_JVMTI
2785 // -Xnoclassgc
2786 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2787 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2788 // -Xincgc: i-CMS
2789 } else if (match_option(option, "-Xincgc", &tail)) {
2790 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2791 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2792 // -Xnoincgc: no i-CMS
2793 } else if (match_option(option, "-Xnoincgc", &tail)) {
2794 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2795 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2796 // -Xconcgc
2797 } else if (match_option(option, "-Xconcgc", &tail)) {
2798 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2799 // -Xnoconcgc
2800 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2801 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2802 // -Xbatch
2803 } else if (match_option(option, "-Xbatch", &tail)) {
2804 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2805 // -Xmn for compatibility with other JVM vendors
2806 } else if (match_option(option, "-Xmn", &tail)) {
2807 julong long_initial_young_size = 0;
2808 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2809 if (errcode != arg_in_range) {
2810 jio_fprintf(defaultStream::error_stream(),
2811 "Invalid initial young generation size: %s\n", option->optionString);
2812 describe_range_error(errcode);
2813 return JNI_EINVAL;
2814 }
2815 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2816 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2817 // -Xms
2818 } else if (match_option(option, "-Xms", &tail)) {
2819 julong long_initial_heap_size = 0;
2820 // an initial heap size of 0 means automatically determine
2821 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2822 if (errcode != arg_in_range) {
2823 jio_fprintf(defaultStream::error_stream(),
2824 "Invalid initial heap size: %s\n", option->optionString);
2825 describe_range_error(errcode);
2826 return JNI_EINVAL;
2827 }
2828 set_min_heap_size((uintx)long_initial_heap_size);
2829 // Currently the minimum size and the initial heap sizes are the same.
2830 // Can be overridden with -XX:InitialHeapSize.
2831 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2832 // -Xmx
2833 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2834 julong long_max_heap_size = 0;
2835 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2836 if (errcode != arg_in_range) {
2837 jio_fprintf(defaultStream::error_stream(),
2838 "Invalid maximum heap size: %s\n", option->optionString);
2839 describe_range_error(errcode);
2840 return JNI_EINVAL;
2841 }
2842 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2843 // Xmaxf
2844 } else if (match_option(option, "-Xmaxf", &tail)) {
2845 char* err;
2846 int maxf = (int)(strtod(tail, &err) * 100);
2847 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2848 jio_fprintf(defaultStream::error_stream(),
2849 "Bad max heap free percentage size: %s\n",
2850 option->optionString);
2851 return JNI_EINVAL;
2852 } else {
2853 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2854 }
2855 // Xminf
2856 } else if (match_option(option, "-Xminf", &tail)) {
2857 char* err;
2858 int minf = (int)(strtod(tail, &err) * 100);
2859 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2860 jio_fprintf(defaultStream::error_stream(),
2861 "Bad min heap free percentage size: %s\n",
2862 option->optionString);
2863 return JNI_EINVAL;
2864 } else {
2865 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2866 }
2867 // -Xss
2868 } else if (match_option(option, "-Xss", &tail)) {
2869 julong long_ThreadStackSize = 0;
2870 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2871 if (errcode != arg_in_range) {
2872 jio_fprintf(defaultStream::error_stream(),
2873 "Invalid thread stack size: %s\n", option->optionString);
2874 describe_range_error(errcode);
2875 return JNI_EINVAL;
2876 }
2877 // Internally track ThreadStackSize in units of 1024 bytes.
2878 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2879 round_to((int)long_ThreadStackSize, K) / K);
2880 // -Xoss
2881 } else if (match_option(option, "-Xoss", &tail)) {
2882 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2883 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2884 julong long_CodeCacheExpansionSize = 0;
2885 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2886 if (errcode != arg_in_range) {
2887 jio_fprintf(defaultStream::error_stream(),
2888 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2889 os::vm_page_size()/K);
2890 return JNI_EINVAL;
2891 }
2892 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2893 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2894 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2895 julong long_ReservedCodeCacheSize = 0;
2896
2897 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2898 if (errcode != arg_in_range) {
2899 jio_fprintf(defaultStream::error_stream(),
2900 "Invalid maximum code cache size: %s.\n", option->optionString);
2901 return JNI_EINVAL;
2902 }
2903 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2904 //-XX:IncreaseFirstTierCompileThresholdAt=
2905 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2906 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2907 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2908 jio_fprintf(defaultStream::error_stream(),
2909 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2910 option->optionString);
2911 return JNI_EINVAL;
2912 }
2913 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2914 // -green
2915 } else if (match_option(option, "-green", &tail)) {
2916 jio_fprintf(defaultStream::error_stream(),
2917 "Green threads support not available\n");
2918 return JNI_EINVAL;
2919 // -native
2920 } else if (match_option(option, "-native", &tail)) {
2921 // HotSpot always uses native threads, ignore silently for compatibility
2922 // -Xsqnopause
2923 } else if (match_option(option, "-Xsqnopause", &tail)) {
2924 // EVM option, ignore silently for compatibility
2925 // -Xrs
2926 } else if (match_option(option, "-Xrs", &tail)) {
2927 // Classic/EVM option, new functionality
2928 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2929 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2930 // change default internal VM signals used - lower case for back compat
2931 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2932 // -Xoptimize
2933 } else if (match_option(option, "-Xoptimize", &tail)) {
2934 // EVM option, ignore silently for compatibility
2935 // -Xprof
2936 } else if (match_option(option, "-Xprof", &tail)) {
2937 #if INCLUDE_FPROF
2938 _has_profile = true;
2939 #else // INCLUDE_FPROF
2940 jio_fprintf(defaultStream::error_stream(),
2941 "Flat profiling is not supported in this VM.\n");
2942 return JNI_ERR;
2943 #endif // INCLUDE_FPROF
2944 // -Xconcurrentio
2945 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2946 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2947 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2948 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2949 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2950 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2951
2952 // -Xinternalversion
2953 } else if (match_option(option, "-Xinternalversion", &tail)) {
2954 jio_fprintf(defaultStream::output_stream(), "%s\n",
2955 VM_Version::internal_vm_info_string());
2956 vm_exit(0);
2957 #ifndef PRODUCT
2958 // -Xprintflags
2959 } else if (match_option(option, "-Xprintflags", &tail)) {
2960 CommandLineFlags::printFlags(tty, false);
2961 vm_exit(0);
2962 #endif
2963 // -D
2964 } else if (match_option(option, "-D", &tail)) {
2965 if (!add_property(tail)) {
2966 return JNI_ENOMEM;
2967 }
2968 // Out of the box management support
2969 if (match_option(option, "-Dcom.sun.management", &tail)) {
2970 #if INCLUDE_MANAGEMENT
2971 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2972 #else
2973 jio_fprintf(defaultStream::output_stream(),
2974 "-Dcom.sun.management is not supported in this VM.\n");
2975 return JNI_ERR;
2976 #endif
2977 }
2978 // -Xint
2979 } else if (match_option(option, "-Xint", &tail)) {
2980 set_mode_flags(_int);
2981 // -Xmixed
2982 } else if (match_option(option, "-Xmixed", &tail)) {
2983 set_mode_flags(_mixed);
2984 // -Xcomp
2985 } else if (match_option(option, "-Xcomp", &tail)) {
2986 // for testing the compiler; turn off all flags that inhibit compilation
2987 set_mode_flags(_comp);
2988 // -Xshare:dump
2989 } else if (match_option(option, "-Xshare:dump", &tail)) {
2990 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2991 set_mode_flags(_int); // Prevent compilation, which creates objects
2992 // -Xshare:on
2993 } else if (match_option(option, "-Xshare:on", &tail)) {
2994 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2995 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2996 // -Xshare:auto
2997 } else if (match_option(option, "-Xshare:auto", &tail)) {
2998 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2999 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3000 // -Xshare:off
3001 } else if (match_option(option, "-Xshare:off", &tail)) {
3002 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3003 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3004 // -Xverify
3005 } else if (match_option(option, "-Xverify", &tail)) {
3006 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3007 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3008 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3009 } else if (strcmp(tail, ":remote") == 0) {
3010 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3011 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3012 } else if (strcmp(tail, ":none") == 0) {
3013 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3014 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3015 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3016 return JNI_EINVAL;
3017 }
3018 // -Xdebug
3019 } else if (match_option(option, "-Xdebug", &tail)) {
3020 // note this flag has been used, then ignore
3021 set_xdebug_mode(true);
3022 // -Xnoagent
3023 } else if (match_option(option, "-Xnoagent", &tail)) {
3024 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3025 } else if (match_option(option, "-Xboundthreads", &tail)) {
3026 // Bind user level threads to kernel threads (Solaris only)
3027 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3028 } else if (match_option(option, "-Xloggc:", &tail)) {
3029 // Redirect GC output to the file. -Xloggc:<filename>
3030 // ostream_init_log(), when called will use this filename
3031 // to initialize a fileStream.
3032 _gc_log_filename = strdup(tail);
3033 if (!is_filename_valid(_gc_log_filename)) {
3034 jio_fprintf(defaultStream::output_stream(),
3035 "Invalid file name for use with -Xloggc: Filename can only contain the "
3036 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3037 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3038 return JNI_EINVAL;
3039 }
3040 FLAG_SET_CMDLINE(bool, PrintGC, true);
3041 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3042
3043 // JNI hooks
3044 } else if (match_option(option, "-Xcheck", &tail)) {
3045 if (!strcmp(tail, ":jni")) {
3046 #if !INCLUDE_JNI_CHECK
3047 warning("JNI CHECKING is not supported in this VM");
3048 #else
3049 CheckJNICalls = true;
3050 #endif // INCLUDE_JNI_CHECK
3051 } else if (is_bad_option(option, args->ignoreUnrecognized,
3052 "check")) {
3053 return JNI_EINVAL;
3054 }
3055 } else if (match_option(option, "vfprintf", &tail)) {
3056 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3057 } else if (match_option(option, "exit", &tail)) {
3058 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3059 } else if (match_option(option, "abort", &tail)) {
3060 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3061 // -XX:+AggressiveHeap
3062 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3063
3064 // This option inspects the machine and attempts to set various
3065 // parameters to be optimal for long-running, memory allocation
3066 // intensive jobs. It is intended for machines with large
3067 // amounts of cpu and memory.
3068
3069 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3070 // VM, but we may not be able to represent the total physical memory
3071 // available (like having 8gb of memory on a box but using a 32bit VM).
3072 // Thus, we need to make sure we're using a julong for intermediate
3073 // calculations.
3074 julong initHeapSize;
3075 julong total_memory = os::physical_memory();
3076
3077 if (total_memory < (julong)256*M) {
3078 jio_fprintf(defaultStream::error_stream(),
3079 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3080 vm_exit(1);
3081 }
3082
3083 // The heap size is half of available memory, or (at most)
3084 // all of possible memory less 160mb (leaving room for the OS
3085 // when using ISM). This is the maximum; because adaptive sizing
3086 // is turned on below, the actual space used may be smaller.
3087
3088 initHeapSize = MIN2(total_memory / (julong)2,
3089 total_memory - (julong)160*M);
3090
3091 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3092
3093 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3094 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3095 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3096 // Currently the minimum size and the initial heap sizes are the same.
3097 set_min_heap_size(initHeapSize);
3098 }
3099 if (FLAG_IS_DEFAULT(NewSize)) {
3100 // Make the young generation 3/8ths of the total heap.
3101 FLAG_SET_CMDLINE(uintx, NewSize,
3102 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3103 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3104 }
3105
3106 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3107 FLAG_SET_DEFAULT(UseLargePages, true);
3108 #endif
3109
3110 // Increase some data structure sizes for efficiency
3111 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3112 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3113 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3114
3115 // See the OldPLABSize comment below, but replace 'after promotion'
3116 // with 'after copying'. YoungPLABSize is the size of the survivor
3117 // space per-gc-thread buffers. The default is 4kw.
3118 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3119
3120 // OldPLABSize is the size of the buffers in the old gen that
3121 // UseParallelGC uses to promote live data that doesn't fit in the
3122 // survivor spaces. At any given time, there's one for each gc thread.
3123 // The default size is 1kw. These buffers are rarely used, since the
3124 // survivor spaces are usually big enough. For specjbb, however, there
3125 // are occasions when there's lots of live data in the young gen
3126 // and we end up promoting some of it. We don't have a definite
3127 // explanation for why bumping OldPLABSize helps, but the theory
3128 // is that a bigger PLAB results in retaining something like the
3129 // original allocation order after promotion, which improves mutator
3130 // locality. A minor effect may be that larger PLABs reduce the
3131 // number of PLAB allocation events during gc. The value of 8kw
3132 // was arrived at by experimenting with specjbb.
3133 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3134
3135 // Enable parallel GC and adaptive generation sizing
3136 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3137 FLAG_SET_DEFAULT(ParallelGCThreads,
3138 Abstract_VM_Version::parallel_worker_threads());
3139
3140 // Encourage steady state memory management
3141 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3142
3143 // This appears to improve mutator locality
3144 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3145
3146 // Get around early Solaris scheduling bug
3147 // (affinity vs other jobs on system)
3148 // but disallow DR and offlining (5008695).
3149 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3150
3151 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3152 // The last option must always win.
3153 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3154 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3155 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3156 // The last option must always win.
3157 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3158 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3159 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3160 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3161 jio_fprintf(defaultStream::error_stream(),
3162 "Please use CMSClassUnloadingEnabled in place of "
3163 "CMSPermGenSweepingEnabled in the future\n");
3164 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3165 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3166 jio_fprintf(defaultStream::error_stream(),
3167 "Please use -XX:+UseGCOverheadLimit in place of "
3168 "-XX:+UseGCTimeLimit in the future\n");
3169 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3170 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3171 jio_fprintf(defaultStream::error_stream(),
3172 "Please use -XX:-UseGCOverheadLimit in place of "
3173 "-XX:-UseGCTimeLimit in the future\n");
3174 // The TLE options are for compatibility with 1.3 and will be
3175 // removed without notice in a future release. These options
3176 // are not to be documented.
3177 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3178 // No longer used.
3179 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3180 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3181 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3182 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3183 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3184 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3185 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3186 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3187 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3188 // No longer used.
3189 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3190 julong long_tlab_size = 0;
3191 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3192 if (errcode != arg_in_range) {
3193 jio_fprintf(defaultStream::error_stream(),
3194 "Invalid TLAB size: %s\n", option->optionString);
3195 describe_range_error(errcode);
3196 return JNI_EINVAL;
3197 }
3198 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3199 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3200 // No longer used.
3201 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3202 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3203 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3204 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3205 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3206 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3207 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3208 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3209 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3210 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3211 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3212 #if defined(DTRACE_ENABLED)
3213 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3214 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3215 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3216 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3217 #else // defined(DTRACE_ENABLED)
3218 jio_fprintf(defaultStream::error_stream(),
3219 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3220 return JNI_EINVAL;
3221 #endif // defined(DTRACE_ENABLED)
3222 #ifdef ASSERT
3223 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3224 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3225 // disable scavenge before parallel mark-compact
3226 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3227 #endif
3228 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3229 julong cms_blocks_to_claim = (julong)atol(tail);
3230 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3231 jio_fprintf(defaultStream::error_stream(),
3232 "Please use -XX:OldPLABSize in place of "
3233 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3234 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3235 julong cms_blocks_to_claim = (julong)atol(tail);
3236 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3237 jio_fprintf(defaultStream::error_stream(),
3238 "Please use -XX:OldPLABSize in place of "
3239 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3240 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3241 julong old_plab_size = 0;
3242 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3243 if (errcode != arg_in_range) {
3244 jio_fprintf(defaultStream::error_stream(),
3245 "Invalid old PLAB size: %s\n", option->optionString);
3246 describe_range_error(errcode);
3247 return JNI_EINVAL;
3248 }
3249 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3250 jio_fprintf(defaultStream::error_stream(),
3251 "Please use -XX:OldPLABSize in place of "
3252 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3253 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3254 julong young_plab_size = 0;
3255 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3256 if (errcode != arg_in_range) {
3257 jio_fprintf(defaultStream::error_stream(),
3258 "Invalid young PLAB size: %s\n", option->optionString);
3259 describe_range_error(errcode);
3260 return JNI_EINVAL;
3261 }
3262 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3263 jio_fprintf(defaultStream::error_stream(),
3264 "Please use -XX:YoungPLABSize in place of "
3265 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3266 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3267 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3268 julong stack_size = 0;
3269 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3270 if (errcode != arg_in_range) {
3271 jio_fprintf(defaultStream::error_stream(),
3272 "Invalid mark stack size: %s\n", option->optionString);
3273 describe_range_error(errcode);
3274 return JNI_EINVAL;
3275 }
3276 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3277 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3278 julong max_stack_size = 0;
3279 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3280 if (errcode != arg_in_range) {
3281 jio_fprintf(defaultStream::error_stream(),
3282 "Invalid maximum mark stack size: %s\n",
3283 option->optionString);
3284 describe_range_error(errcode);
3285 return JNI_EINVAL;
3286 }
3287 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3288 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3289 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3290 uintx conc_threads = 0;
3291 if (!parse_uintx(tail, &conc_threads, 1)) {
3292 jio_fprintf(defaultStream::error_stream(),
3293 "Invalid concurrent threads: %s\n", option->optionString);
3294 return JNI_EINVAL;
3295 }
3296 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3297 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3298 julong max_direct_memory_size = 0;
3299 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3300 if (errcode != arg_in_range) {
3301 jio_fprintf(defaultStream::error_stream(),
3302 "Invalid maximum direct memory size: %s\n",
3303 option->optionString);
3304 describe_range_error(errcode);
3305 return JNI_EINVAL;
3306 }
3307 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3308 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3309 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3310 // away and will cause VM initialization failures!
3311 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3312 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3313 #if !INCLUDE_MANAGEMENT
3314 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3315 jio_fprintf(defaultStream::error_stream(),
3316 "ManagementServer is not supported in this VM.\n");
3317 return JNI_ERR;
3318 #endif // INCLUDE_MANAGEMENT
3319 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3320 // Skip -XX:Flags= since that case has already been handled
3321 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3322 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3323 return JNI_EINVAL;
3324 }
3325 }
3326 // Unknown option
3327 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3328 return JNI_ERR;
3329 }
3330 }
3331
3332 // PrintSharedArchiveAndExit will turn on
3333 // -Xshare:on
3334 // -XX:+TraceClassPaths
3335 if (PrintSharedArchiveAndExit) {
3336 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3337 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3338 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3339 }
3340
3341 // Change the default value for flags which have different default values
3342 // when working with older JDKs.
3343 #ifdef LINUX
3344 if (JDK_Version::current().compare_major(6) <= 0 &&
3345 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3346 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3347 }
3348 #endif // LINUX
3349 fix_appclasspath();
3350 return JNI_OK;
3351 }
3352
3353 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3354 //
3355 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3356 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3357 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3358 // path is treated as the current directory.
3359 //
3360 // This causes problems with CDS, which requires that all directories specified in the classpath
3361 // must be empty. In most cases, applications do NOT want to load classes from the current
3362 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3363 // scripts compatible with CDS.
3364 void Arguments::fix_appclasspath() {
3365 if (IgnoreEmptyClassPaths) {
3366 const char separator = *os::path_separator();
3367 const char* src = _java_class_path->value();
3368
3369 // skip over all the leading empty paths
3370 while (*src == separator) {
3371 src ++;
3372 }
3373
3374 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3375 strncpy(copy, src, strlen(src) + 1);
3376
3377 // trim all trailing empty paths
3378 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3379 *tail = '\0';
3380 }
3381
3382 char from[3] = {separator, separator, '\0'};
3383 char to [2] = {separator, '\0'};
3384 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3385 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3386 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3387 }
3388
3389 _java_class_path->set_value(copy);
3390 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3391 }
3392
3393 if (!PrintSharedArchiveAndExit) {
3394 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3395 }
3396 }
3397
3398 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3399 // This must be done after all -D arguments have been processed.
3400 scp_p->expand_endorsed();
3401
3402 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3403 // Assemble the bootclasspath elements into the final path.
3404 Arguments::set_sysclasspath(scp_p->combined_path());
3405 }
3406
3407 // This must be done after all arguments have been processed.
3408 // java_compiler() true means set to "NONE" or empty.
3409 if (java_compiler() && !xdebug_mode()) {
3410 // For backwards compatibility, we switch to interpreted mode if
3411 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3412 // not specified.
3413 set_mode_flags(_int);
3414 }
3415 if (CompileThreshold == 0) {
3416 set_mode_flags(_int);
3417 }
3418
3419 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3420 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3421 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3422 }
3423
3424 #ifndef COMPILER2
3425 // Don't degrade server performance for footprint
3426 if (FLAG_IS_DEFAULT(UseLargePages) &&
3427 MaxHeapSize < LargePageHeapSizeThreshold) {
3428 // No need for large granularity pages w/small heaps.
3429 // Note that large pages are enabled/disabled for both the
3430 // Java heap and the code cache.
3431 FLAG_SET_DEFAULT(UseLargePages, false);
3432 }
3433
3434 #else
3435 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3436 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3437 }
3438 #endif
3439
3440 #ifndef TIERED
3441 // Tiered compilation is undefined.
3442 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3443 #endif
3444
3445 // If we are running in a headless jre, force java.awt.headless property
3446 // to be true unless the property has already been set.
3447 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3448 if (os::is_headless_jre()) {
3449 const char* headless = Arguments::get_property("java.awt.headless");
3450 if (headless == NULL) {
3451 char envbuffer[128];
3452 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3453 if (!add_property("java.awt.headless=true")) {
3454 return JNI_ENOMEM;
3455 }
3456 } else {
3457 char buffer[256];
3458 strcpy(buffer, "java.awt.headless=");
3459 strcat(buffer, envbuffer);
3460 if (!add_property(buffer)) {
3461 return JNI_ENOMEM;
3462 }
3463 }
3464 }
3465 }
3466
3467 if (!ArgumentsExt::check_vm_args_consistency()) {
3468 return JNI_ERR;
3469 }
3470
3471 return JNI_OK;
3472 }
3473
3474 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3475 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3476 scp_assembly_required_p);
3477 }
3478
3479 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3480 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3481 scp_assembly_required_p);
3482 }
3483
3484 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3485 const int N_MAX_OPTIONS = 64;
3486 const int OPTION_BUFFER_SIZE = 1024;
3487 char buffer[OPTION_BUFFER_SIZE];
3488
3489 // The variable will be ignored if it exceeds the length of the buffer.
3490 // Don't check this variable if user has special privileges
3491 // (e.g. unix su command).
3492 if (os::getenv(name, buffer, sizeof(buffer)) &&
3493 !os::have_special_privileges()) {
3494 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3495 jio_fprintf(defaultStream::error_stream(),
3496 "Picked up %s: %s\n", name, buffer);
3497 char* rd = buffer; // pointer to the input string (rd)
3498 int i;
3499 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3500 while (isspace(*rd)) rd++; // skip whitespace
3501 if (*rd == 0) break; // we re done when the input string is read completely
3502
3503 // The output, option string, overwrites the input string.
3504 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3505 // input string (rd).
3506 char* wrt = rd;
3507
3508 options[i++].optionString = wrt; // Fill in option
3509 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3510 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3511 int quote = *rd; // matching quote to look for
3512 rd++; // don't copy open quote
3513 while (*rd != quote) { // include everything (even spaces) up until quote
3514 if (*rd == 0) { // string termination means unmatched string
3515 jio_fprintf(defaultStream::error_stream(),
3516 "Unmatched quote in %s\n", name);
3517 return JNI_ERR;
3518 }
3519 *wrt++ = *rd++; // copy to option string
3520 }
3521 rd++; // don't copy close quote
3522 } else {
3523 *wrt++ = *rd++; // copy to option string
3524 }
3525 }
3526 // Need to check if we're done before writing a NULL,
3527 // because the write could be to the byte that rd is pointing to.
3528 if (*rd++ == 0) {
3529 *wrt = 0;
3530 break;
3531 }
3532 *wrt = 0; // Zero terminate option
3533 }
3534 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3535 JavaVMInitArgs vm_args;
3536 vm_args.version = JNI_VERSION_1_2;
3537 vm_args.options = options;
3538 vm_args.nOptions = i;
3539 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3540
3541 if (PrintVMOptions) {
3542 const char* tail;
3543 for (int i = 0; i < vm_args.nOptions; i++) {
3544 const JavaVMOption *option = vm_args.options + i;
3545 if (match_option(option, "-XX:", &tail)) {
3546 logOption(tail);
3547 }
3548 }
3549 }
3550
3551 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3552 }
3553 return JNI_OK;
3554 }
3555
3556 void Arguments::set_shared_spaces_flags() {
3557 if (DumpSharedSpaces) {
3558 if (RequireSharedSpaces) {
3559 warning("cannot dump shared archive while using shared archive");
3560 }
3561 UseSharedSpaces = false;
3562 #ifdef _LP64
3563 if (!UseCompressedOops || !UseCompressedClassPointers) {
3564 vm_exit_during_initialization(
3565 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3566 }
3567 } else {
3568 if (!UseCompressedOops || !UseCompressedClassPointers) {
3569 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3570 }
3571 #endif
3572 }
3573 }
3574
3575 #if !INCLUDE_ALL_GCS
3576 static void force_serial_gc() {
3577 FLAG_SET_DEFAULT(UseSerialGC, true);
3578 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3579 UNSUPPORTED_GC_OPTION(UseG1GC);
3580 UNSUPPORTED_GC_OPTION(UseParallelGC);
3581 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3582 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3583 UNSUPPORTED_GC_OPTION(UseParNewGC);
3584 }
3585 #endif // INCLUDE_ALL_GCS
3586
3587 // Sharing support
3588 // Construct the path to the archive
3589 static char* get_shared_archive_path() {
3590 char *shared_archive_path;
3591 if (SharedArchiveFile == NULL) {
3592 char jvm_path[JVM_MAXPATHLEN];
3593 os::jvm_path(jvm_path, sizeof(jvm_path));
3594 char *end = strrchr(jvm_path, *os::file_separator());
3595 if (end != NULL) *end = '\0';
3596 size_t jvm_path_len = strlen(jvm_path);
3597 size_t file_sep_len = strlen(os::file_separator());
3598 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3599 file_sep_len + 20, mtInternal);
3600 if (shared_archive_path != NULL) {
3601 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3602 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3603 strncat(shared_archive_path, "classes.jsa", 11);
3604 }
3605 } else {
3606 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3607 if (shared_archive_path != NULL) {
3608 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3609 }
3610 }
3611 return shared_archive_path;
3612 }
3613
3614 #ifndef PRODUCT
3615 // Determine whether LogVMOutput should be implicitly turned on.
3616 static bool use_vm_log() {
3617 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3618 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3619 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3620 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3621 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3622 return true;
3623 }
3624
3625 #ifdef COMPILER1
3626 if (PrintC1Statistics) {
3627 return true;
3628 }
3629 #endif // COMPILER1
3630
3631 #ifdef COMPILER2
3632 if (PrintOptoAssembly || PrintOptoStatistics) {
3633 return true;
3634 }
3635 #endif // COMPILER2
3636
3637 return false;
3638 }
3639 #endif // PRODUCT
3640
3641 // Parse entry point called from JNI_CreateJavaVM
3642
3643 jint Arguments::parse(const JavaVMInitArgs* args) {
3644
3645 // Remaining part of option string
3646 const char* tail;
3647
3648 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3649 const char* hotspotrc = ".hotspotrc";
3650 bool settings_file_specified = false;
3651 bool needs_hotspotrc_warning = false;
3652
3653 ArgumentsExt::process_options(args);
3654
3655 const char* flags_file;
3656 int index;
3657 for (index = 0; index < args->nOptions; index++) {
3658 const JavaVMOption *option = args->options + index;
3659 if (match_option(option, "-XX:Flags=", &tail)) {
3660 flags_file = tail;
3661 settings_file_specified = true;
3662 }
3663 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3664 PrintVMOptions = true;
3665 }
3666 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3667 PrintVMOptions = false;
3668 }
3669 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3670 IgnoreUnrecognizedVMOptions = true;
3671 }
3672 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3673 IgnoreUnrecognizedVMOptions = false;
3674 }
3675 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3676 CommandLineFlags::printFlags(tty, false);
3677 vm_exit(0);
3678 }
3679 #if INCLUDE_NMT
3680 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3681 // The launcher did not setup nmt environment variable properly.
3682 if (!MemTracker::check_launcher_nmt_support(tail)) {
3683 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3684 }
3685
3686 // Verify if nmt option is valid.
3687 if (MemTracker::verify_nmt_option()) {
3688 // Late initialization, still in single-threaded mode.
3689 if (MemTracker::tracking_level() >= NMT_summary) {
3690 MemTracker::init();
3691 }
3692 } else {
3693 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3694 }
3695 }
3696 #endif
3697
3698
3699 #ifndef PRODUCT
3700 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3701 CommandLineFlags::printFlags(tty, true);
3702 vm_exit(0);
3703 }
3704 #endif
3705 }
3706
3707 if (IgnoreUnrecognizedVMOptions) {
3708 // uncast const to modify the flag args->ignoreUnrecognized
3709 *(jboolean*)(&args->ignoreUnrecognized) = true;
3710 }
3711
3712 // Parse specified settings file
3713 if (settings_file_specified) {
3714 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3715 return JNI_EINVAL;
3716 }
3717 } else {
3718 #ifdef ASSERT
3719 // Parse default .hotspotrc settings file
3720 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3721 return JNI_EINVAL;
3722 }
3723 #else
3724 struct stat buf;
3725 if (os::stat(hotspotrc, &buf) == 0) {
3726 needs_hotspotrc_warning = true;
3727 }
3728 #endif
3729 }
3730
3731 if (PrintVMOptions) {
3732 for (index = 0; index < args->nOptions; index++) {
3733 const JavaVMOption *option = args->options + index;
3734 if (match_option(option, "-XX:", &tail)) {
3735 logOption(tail);
3736 }
3737 }
3738 }
3739
3740 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3741 jint result = parse_vm_init_args(args);
3742 if (result != JNI_OK) {
3743 return result;
3744 }
3745
3746 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3747 SharedArchivePath = get_shared_archive_path();
3748 if (SharedArchivePath == NULL) {
3749 return JNI_ENOMEM;
3750 }
3751
3752 // Set up VerifySharedSpaces
3753 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3754 VerifySharedSpaces = true;
3755 }
3756
3757 // Delay warning until here so that we've had a chance to process
3758 // the -XX:-PrintWarnings flag
3759 if (needs_hotspotrc_warning) {
3760 warning("%s file is present but has been ignored. "
3761 "Run with -XX:Flags=%s to load the file.",
3762 hotspotrc, hotspotrc);
3763 }
3764
3765 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3766 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3767 #endif
3768
3769 #if INCLUDE_ALL_GCS
3770 #if (defined JAVASE_EMBEDDED || defined ARM)
3771 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3772 #endif
3773 #endif
3774
3775 #ifndef PRODUCT
3776 if (TraceBytecodesAt != 0) {
3777 TraceBytecodes = true;
3778 }
3779 if (CountCompiledCalls) {
3780 if (UseCounterDecay) {
3781 warning("UseCounterDecay disabled because CountCalls is set");
3782 UseCounterDecay = false;
3783 }
3784 }
3785 #endif // PRODUCT
3786
3787 // JSR 292 is not supported before 1.7
3788 if (!JDK_Version::is_gte_jdk17x_version()) {
3789 if (EnableInvokeDynamic) {
3790 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3791 warning("JSR 292 is not supported before 1.7. Disabling support.");
3792 }
3793 EnableInvokeDynamic = false;
3794 }
3795 }
3796
3797 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3798 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3799 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3800 }
3801 ScavengeRootsInCode = 1;
3802 }
3803
3804 if (PrintGCDetails) {
3805 // Turn on -verbose:gc options as well
3806 PrintGC = true;
3807 }
3808
3809 if (!JDK_Version::is_gte_jdk18x_version()) {
3810 // To avoid changing the log format for 7 updates this flag is only
3811 // true by default in JDK8 and above.
3812 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3813 FLAG_SET_DEFAULT(PrintGCCause, false);
3814 }
3815 }
3816
3817 // Set object alignment values.
3818 set_object_alignment();
3819
3820 #if !INCLUDE_ALL_GCS
3821 force_serial_gc();
3822 #endif // INCLUDE_ALL_GCS
3823 #if !INCLUDE_CDS
3824 if (DumpSharedSpaces || RequireSharedSpaces) {
3825 jio_fprintf(defaultStream::error_stream(),
3826 "Shared spaces are not supported in this VM\n");
3827 return JNI_ERR;
3828 }
3829 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3830 warning("Shared spaces are not supported in this VM");
3831 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3832 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3833 }
3834 no_shared_spaces("CDS Disabled");
3835 #endif // INCLUDE_CDS
3836
3837 return JNI_OK;
3838 }
3839
3840 jint Arguments::apply_ergo() {
3841
3842 // Set flags based on ergonomics.
3843 set_ergonomics_flags();
3844
3845 set_shared_spaces_flags();
3846
3847 // Check the GC selections again.
3848 if (!ArgumentsExt::check_gc_consistency_ergo()) {
3849 return JNI_EINVAL;
3850 }
3851
3852 if (TieredCompilation) {
3853 set_tiered_flags();
3854 } else {
3855 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3856 if (CompilationPolicyChoice >= 2) {
3857 vm_exit_during_initialization(
3858 "Incompatible compilation policy selected", NULL);
3859 }
3860 }
3861 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3862 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3863 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3864 }
3865
3866
3867 // Set heap size based on available physical memory
3868 set_heap_size();
3869
3870 set_gc_specific_flags();
3871
3872 // Initialize Metaspace flags and alignments.
3873 Metaspace::ergo_initialize();
3874
3875 // Set bytecode rewriting flags
3876 set_bytecode_flags();
3877
3878 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3879 set_aggressive_opts_flags();
3880
3881 // Turn off biased locking for locking debug mode flags,
3882 // which are subtlely different from each other but neither works with
3883 // biased locking.
3884 if (UseHeavyMonitors
3885 #ifdef COMPILER1
3886 || !UseFastLocking
3887 #endif // COMPILER1
3888 ) {
3889 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3890 // flag set to true on command line; warn the user that they
3891 // can't enable biased locking here
3892 warning("Biased Locking is not supported with locking debug flags"
3893 "; ignoring UseBiasedLocking flag." );
3894 }
3895 UseBiasedLocking = false;
3896 }
3897
3898 #ifdef ZERO
3899 // Clear flags not supported on zero.
3900 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3901 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3902 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3903 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3904 #endif // CC_INTERP
3905
3906 #ifdef COMPILER2
3907 if (!EliminateLocks) {
3908 EliminateNestedLocks = false;
3909 }
3910 if (!Inline) {
3911 IncrementalInline = false;
3912 }
3913 #ifndef PRODUCT
3914 if (!IncrementalInline) {
3915 AlwaysIncrementalInline = false;
3916 }
3917 #endif
3918 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3919 // incremental inlining: bump MaxNodeLimit
3920 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3921 }
3922 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3923 // nothing to use the profiling, turn if off
3924 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3925 }
3926 #endif
3927
3928 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3929 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3930 DebugNonSafepoints = true;
3931 }
3932
3933 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3934 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3935 }
3936
3937 #ifndef PRODUCT
3938 if (CompileTheWorld) {
3939 // Force NmethodSweeper to sweep whole CodeCache each time.
3940 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3941 NmethodSweepFraction = 1;
3942 }
3943 }
3944
3945 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3946 if (use_vm_log()) {
3947 LogVMOutput = true;
3948 }
3949 }
3950 #endif // PRODUCT
3951
3952 if (PrintCommandLineFlags) {
3953 CommandLineFlags::printSetFlags(tty);
3954 }
3955
3956 // Apply CPU specific policy for the BiasedLocking
3957 if (UseBiasedLocking) {
3958 if (!VM_Version::use_biased_locking() &&
3959 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3960 UseBiasedLocking = false;
3961 }
3962 }
3963 #ifdef COMPILER2
3964 if (!UseBiasedLocking || EmitSync != 0) {
3965 UseOptoBiasInlining = false;
3966 }
3967 #endif
3968
3969 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3970 // but only if not already set on the commandline
3971 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3972 bool set = false;
3973 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3974 if (!set) {
3975 FLAG_SET_DEFAULT(PauseAtExit, true);
3976 }
3977 }
3978
3979 return JNI_OK;
3980 }
3981
3982 jint Arguments::adjust_after_os() {
3983 if (UseNUMA) {
3984 if (UseParallelGC || UseParallelOldGC) {
3985 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3986 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3987 }
3988 }
3989 // UseNUMAInterleaving is set to ON for all collectors and
3990 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3991 // such as the parallel collector for Linux and Solaris will
3992 // interleave old gen and survivor spaces on top of NUMA
3993 // allocation policy for the eden space.
3994 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3995 // all platforms and ParallelGC on Windows will interleave all
3996 // of the heap spaces across NUMA nodes.
3997 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3998 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3999 }
4000 }
4001 return JNI_OK;
4002 }
4003
4004 int Arguments::PropertyList_count(SystemProperty* pl) {
4005 int count = 0;
4006 while(pl != NULL) {
4007 count++;
4008 pl = pl->next();
4009 }
4010 return count;
4011 }
4012
4013 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4014 assert(key != NULL, "just checking");
4015 SystemProperty* prop;
4016 for (prop = pl; prop != NULL; prop = prop->next()) {
4017 if (strcmp(key, prop->key()) == 0) return prop->value();
4018 }
4019 return NULL;
4020 }
4021
4022 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4023 int count = 0;
4024 const char* ret_val = NULL;
4025
4026 while(pl != NULL) {
4027 if(count >= index) {
4028 ret_val = pl->key();
4029 break;
4030 }
4031 count++;
4032 pl = pl->next();
4033 }
4034
4035 return ret_val;
4036 }
4037
4038 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4039 int count = 0;
4040 char* ret_val = NULL;
4041
4042 while(pl != NULL) {
4043 if(count >= index) {
4044 ret_val = pl->value();
4045 break;
4046 }
4047 count++;
4048 pl = pl->next();
4049 }
4050
4051 return ret_val;
4052 }
4053
4054 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4055 SystemProperty* p = *plist;
4056 if (p == NULL) {
4057 *plist = new_p;
4058 } else {
4059 while (p->next() != NULL) {
4060 p = p->next();
4061 }
4062 p->set_next(new_p);
4063 }
4064 }
4065
4066 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4067 if (plist == NULL)
4068 return;
4069
4070 SystemProperty* new_p = new SystemProperty(k, v, true);
4071 PropertyList_add(plist, new_p);
4072 }
4073
4074 // This add maintains unique property key in the list.
4075 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4076 if (plist == NULL)
4077 return;
4078
4079 // If property key exist then update with new value.
4080 SystemProperty* prop;
4081 for (prop = *plist; prop != NULL; prop = prop->next()) {
4082 if (strcmp(k, prop->key()) == 0) {
4083 if (append) {
4084 prop->append_value(v);
4085 } else {
4086 prop->set_value(v);
4087 }
4088 return;
4089 }
4090 }
4091
4092 PropertyList_add(plist, k, v);
4093 }
4094
4095 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4096 // Returns true if all of the source pointed by src has been copied over to
4097 // the destination buffer pointed by buf. Otherwise, returns false.
4098 // Notes:
4099 // 1. If the length (buflen) of the destination buffer excluding the
4100 // NULL terminator character is not long enough for holding the expanded
4101 // pid characters, it also returns false instead of returning the partially
4102 // expanded one.
4103 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4104 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4105 char* buf, size_t buflen) {
4106 const char* p = src;
4107 char* b = buf;
4108 const char* src_end = &src[srclen];
4109 char* buf_end = &buf[buflen - 1];
4110
4111 while (p < src_end && b < buf_end) {
4112 if (*p == '%') {
4113 switch (*(++p)) {
4114 case '%': // "%%" ==> "%"
4115 *b++ = *p++;
4116 break;
4117 case 'p': { // "%p" ==> current process id
4118 // buf_end points to the character before the last character so
4119 // that we could write '\0' to the end of the buffer.
4120 size_t buf_sz = buf_end - b + 1;
4121 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4122
4123 // if jio_snprintf fails or the buffer is not long enough to hold
4124 // the expanded pid, returns false.
4125 if (ret < 0 || ret >= (int)buf_sz) {
4126 return false;
4127 } else {
4128 b += ret;
4129 assert(*b == '\0', "fail in copy_expand_pid");
4130 if (p == src_end && b == buf_end + 1) {
4131 // reach the end of the buffer.
4132 return true;
4133 }
4134 }
4135 p++;
4136 break;
4137 }
4138 default :
4139 *b++ = '%';
4140 }
4141 } else {
4142 *b++ = *p++;
4143 }
4144 }
4145 *b = '\0';
4146 return (p == src_end); // return false if not all of the source was copied
4147 }