1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "compiler/compilerOracle.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/cardTableRS.hpp"
32 #include "memory/genCollectedHeap.hpp"
33 #include "memory/referenceProcessor.hpp"
34 #include "memory/universe.inline.hpp"
35 #include "oops/oop.inline.hpp"
36 #include "prims/jvmtiExport.hpp"
37 #include "runtime/arguments.hpp"
38 #include "runtime/arguments_ext.hpp"
39 #include "runtime/globals_extension.hpp"
40 #include "runtime/java.hpp"
41 #include "services/management.hpp"
42 #include "services/memTracker.hpp"
43 #include "utilities/defaultStream.hpp"
44 #include "utilities/macros.hpp"
45 #include "utilities/stringUtils.hpp"
46 #include "utilities/taskqueue.hpp"
47 #ifdef TARGET_OS_FAMILY_linux
48 # include "os_linux.inline.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_solaris
51 # include "os_solaris.inline.hpp"
52 #endif
53 #ifdef TARGET_OS_FAMILY_windows
54 # include "os_windows.inline.hpp"
55 #endif
56 #ifdef TARGET_OS_FAMILY_aix
57 # include "os_aix.inline.hpp"
58 #endif
59 #ifdef TARGET_OS_FAMILY_bsd
60 # include "os_bsd.inline.hpp"
61 #endif
62 #if INCLUDE_ALL_GCS
63 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
64 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
65 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
66 #endif // INCLUDE_ALL_GCS
67
68 // Note: This is a special bug reporting site for the JVM
69 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
70 #define DEFAULT_JAVA_LAUNCHER "generic"
71
72 // Disable options not supported in this release, with a warning if they
73 // were explicitly requested on the command-line
74 #define UNSUPPORTED_OPTION(opt, description) \
75 do { \
76 if (opt) { \
77 if (FLAG_IS_CMDLINE(opt)) { \
78 warning(description " is disabled in this release."); \
79 } \
80 FLAG_SET_DEFAULT(opt, false); \
81 } \
82 } while(0)
83
84 #define UNSUPPORTED_GC_OPTION(gc) \
85 do { \
86 if (gc) { \
87 if (FLAG_IS_CMDLINE(gc)) { \
88 warning(#gc " is not supported in this VM. Using Serial GC."); \
89 } \
90 FLAG_SET_DEFAULT(gc, false); \
91 } \
92 } while(0)
93
94 char** Arguments::_jvm_flags_array = NULL;
95 int Arguments::_num_jvm_flags = 0;
96 char** Arguments::_jvm_args_array = NULL;
97 int Arguments::_num_jvm_args = 0;
98 char* Arguments::_java_command = NULL;
99 SystemProperty* Arguments::_system_properties = NULL;
100 const char* Arguments::_gc_log_filename = NULL;
101 bool Arguments::_has_profile = false;
102 size_t Arguments::_conservative_max_heap_alignment = 0;
103 uintx Arguments::_min_heap_size = 0;
104 uintx Arguments::_min_heap_free_ratio = 0;
105 uintx Arguments::_max_heap_free_ratio = 0;
106 Arguments::Mode Arguments::_mode = _mixed;
107 bool Arguments::_java_compiler = false;
108 bool Arguments::_xdebug_mode = false;
109 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
110 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
111 int Arguments::_sun_java_launcher_pid = -1;
112 bool Arguments::_created_by_gamma_launcher = false;
113
114 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
115 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
116 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
117 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
118 bool Arguments::_ClipInlining = ClipInlining;
119
120 char* Arguments::SharedArchivePath = NULL;
121
122 AgentLibraryList Arguments::_libraryList;
123 AgentLibraryList Arguments::_agentList;
124
125 abort_hook_t Arguments::_abort_hook = NULL;
126 exit_hook_t Arguments::_exit_hook = NULL;
127 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
128
129
130 SystemProperty *Arguments::_java_ext_dirs = NULL;
131 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
132 SystemProperty *Arguments::_sun_boot_library_path = NULL;
133 SystemProperty *Arguments::_java_library_path = NULL;
134 SystemProperty *Arguments::_java_home = NULL;
135 SystemProperty *Arguments::_java_class_path = NULL;
136 SystemProperty *Arguments::_sun_boot_class_path = NULL;
137
138 char* Arguments::_meta_index_path = NULL;
139 char* Arguments::_meta_index_dir = NULL;
140
141 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
142
143 static bool match_option(const JavaVMOption *option, const char* name,
144 const char** tail) {
145 int len = (int)strlen(name);
146 if (strncmp(option->optionString, name, len) == 0) {
147 *tail = option->optionString + len;
148 return true;
149 } else {
150 return false;
151 }
152 }
153
154 static void logOption(const char* opt) {
155 if (PrintVMOptions) {
156 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
157 }
158 }
159
160 // Process java launcher properties.
161 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
162 // See if sun.java.launcher or sun.java.launcher.pid is defined.
163 // Must do this before setting up other system properties,
164 // as some of them may depend on launcher type.
165 for (int index = 0; index < args->nOptions; index++) {
166 const JavaVMOption* option = args->options + index;
167 const char* tail;
168
169 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
170 process_java_launcher_argument(tail, option->extraInfo);
171 continue;
172 }
173 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
174 _sun_java_launcher_pid = atoi(tail);
175 continue;
176 }
177 }
178 }
179
180 // Initialize system properties key and value.
181 void Arguments::init_system_properties() {
182
183 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
184 "Java Virtual Machine Specification", false));
185 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
186 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
187 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
188
189 // following are JVMTI agent writeable properties.
190 // Properties values are set to NULL and they are
191 // os specific they are initialized in os::init_system_properties_values().
192 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
193 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
194 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
195 _java_library_path = new SystemProperty("java.library.path", NULL, true);
196 _java_home = new SystemProperty("java.home", NULL, true);
197 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
198
199 _java_class_path = new SystemProperty("java.class.path", "", true);
200
201 // Add to System Property list.
202 PropertyList_add(&_system_properties, _java_ext_dirs);
203 PropertyList_add(&_system_properties, _java_endorsed_dirs);
204 PropertyList_add(&_system_properties, _sun_boot_library_path);
205 PropertyList_add(&_system_properties, _java_library_path);
206 PropertyList_add(&_system_properties, _java_home);
207 PropertyList_add(&_system_properties, _java_class_path);
208 PropertyList_add(&_system_properties, _sun_boot_class_path);
209
210 // Set OS specific system properties values
211 os::init_system_properties_values();
212 }
213
214
215 // Update/Initialize System properties after JDK version number is known
216 void Arguments::init_version_specific_system_properties() {
217 enum { bufsz = 16 };
218 char buffer[bufsz];
219 const char* spec_vendor = "Sun Microsystems Inc.";
220 uint32_t spec_version = 0;
221
222 if (JDK_Version::is_gte_jdk17x_version()) {
223 spec_vendor = "Oracle Corporation";
224 spec_version = JDK_Version::current().major_version();
225 }
226 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
227
228 PropertyList_add(&_system_properties,
229 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
230 PropertyList_add(&_system_properties,
231 new SystemProperty("java.vm.specification.version", buffer, false));
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
234 }
235
236 /**
237 * Provide a slightly more user-friendly way of eliminating -XX flags.
238 * When a flag is eliminated, it can be added to this list in order to
239 * continue accepting this flag on the command-line, while issuing a warning
240 * and ignoring the value. Once the JDK version reaches the 'accept_until'
241 * limit, we flatly refuse to admit the existence of the flag. This allows
242 * a flag to die correctly over JDK releases using HSX.
243 */
244 typedef struct {
245 const char* name;
246 JDK_Version obsoleted_in; // when the flag went away
247 JDK_Version accept_until; // which version to start denying the existence
248 } ObsoleteFlag;
249
250 static ObsoleteFlag obsolete_jvm_flags[] = {
251 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
252 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
253 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
258 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
259 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
260 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
261 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
262 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
263 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
264 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
265 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
266 { "DefaultInitialRAMFraction",
267 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
268 { "UseDepthFirstScavengeOrder",
269 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
270 { "HandlePromotionFailure",
271 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
272 { "MaxLiveObjectEvacuationRatio",
273 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
274 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
275 { "UseParallelOldGCCompacting",
276 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
277 { "UseParallelDensePrefixUpdate",
278 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
279 { "UseParallelOldGCDensePrefix",
280 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
281 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
282 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
283 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
284 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
285 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
295 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
296 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
297 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
298 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
299 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
300 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
302 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
303 { "CompilationRepeat", JDK_Version::jdk(8), JDK_Version::jdk(9) },
304 #ifdef PRODUCT
305 { "DesiredMethodLimit",
306 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
307 #endif // PRODUCT
308 { NULL, JDK_Version(0), JDK_Version(0) }
309 };
310
311 // Returns true if the flag is obsolete and fits into the range specified
312 // for being ignored. In the case that the flag is ignored, the 'version'
313 // value is filled in with the version number when the flag became
314 // obsolete so that that value can be displayed to the user.
315 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
316 int i = 0;
317 assert(version != NULL, "Must provide a version buffer");
318 while (obsolete_jvm_flags[i].name != NULL) {
319 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
320 // <flag>=xxx form
321 // [-|+]<flag> form
322 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
323 ((s[0] == '+' || s[0] == '-') &&
324 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
325 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
326 *version = flag_status.obsoleted_in;
327 return true;
328 }
329 }
330 i++;
331 }
332 return false;
333 }
334
335 // Constructs the system class path (aka boot class path) from the following
336 // components, in order:
337 //
338 // prefix // from -Xbootclasspath/p:...
339 // endorsed // the expansion of -Djava.endorsed.dirs=...
340 // base // from os::get_system_properties() or -Xbootclasspath=
341 // suffix // from -Xbootclasspath/a:...
342 //
343 // java.endorsed.dirs is a list of directories; any jar or zip files in the
344 // directories are added to the sysclasspath just before the base.
345 //
346 // This could be AllStatic, but it isn't needed after argument processing is
347 // complete.
348 class SysClassPath: public StackObj {
349 public:
350 SysClassPath(const char* base);
351 ~SysClassPath();
352
353 inline void set_base(const char* base);
354 inline void add_prefix(const char* prefix);
355 inline void add_suffix_to_prefix(const char* suffix);
356 inline void add_suffix(const char* suffix);
357 inline void reset_path(const char* base);
358
359 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
360 // property. Must be called after all command-line arguments have been
361 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
362 // combined_path().
363 void expand_endorsed();
364
365 inline const char* get_base() const { return _items[_scp_base]; }
366 inline const char* get_prefix() const { return _items[_scp_prefix]; }
367 inline const char* get_suffix() const { return _items[_scp_suffix]; }
368 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
369
370 // Combine all the components into a single c-heap-allocated string; caller
371 // must free the string if/when no longer needed.
372 char* combined_path();
373
374 private:
375 // Utility routines.
376 static char* add_to_path(const char* path, const char* str, bool prepend);
377 static char* add_jars_to_path(char* path, const char* directory);
378
379 inline void reset_item_at(int index);
380
381 // Array indices for the items that make up the sysclasspath. All except the
382 // base are allocated in the C heap and freed by this class.
383 enum {
384 _scp_prefix, // from -Xbootclasspath/p:...
385 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
386 _scp_base, // the default sysclasspath
387 _scp_suffix, // from -Xbootclasspath/a:...
388 _scp_nitems // the number of items, must be last.
389 };
390
391 const char* _items[_scp_nitems];
392 DEBUG_ONLY(bool _expansion_done;)
393 };
394
395 SysClassPath::SysClassPath(const char* base) {
396 memset(_items, 0, sizeof(_items));
397 _items[_scp_base] = base;
398 DEBUG_ONLY(_expansion_done = false;)
399 }
400
401 SysClassPath::~SysClassPath() {
402 // Free everything except the base.
403 for (int i = 0; i < _scp_nitems; ++i) {
404 if (i != _scp_base) reset_item_at(i);
405 }
406 DEBUG_ONLY(_expansion_done = false;)
407 }
408
409 inline void SysClassPath::set_base(const char* base) {
410 _items[_scp_base] = base;
411 }
412
413 inline void SysClassPath::add_prefix(const char* prefix) {
414 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
415 }
416
417 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
418 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
419 }
420
421 inline void SysClassPath::add_suffix(const char* suffix) {
422 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
423 }
424
425 inline void SysClassPath::reset_item_at(int index) {
426 assert(index < _scp_nitems && index != _scp_base, "just checking");
427 if (_items[index] != NULL) {
428 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
429 _items[index] = NULL;
430 }
431 }
432
433 inline void SysClassPath::reset_path(const char* base) {
434 // Clear the prefix and suffix.
435 reset_item_at(_scp_prefix);
436 reset_item_at(_scp_suffix);
437 set_base(base);
438 }
439
440 //------------------------------------------------------------------------------
441
442 void SysClassPath::expand_endorsed() {
443 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
444
445 const char* path = Arguments::get_property("java.endorsed.dirs");
446 if (path == NULL) {
447 path = Arguments::get_endorsed_dir();
448 assert(path != NULL, "no default for java.endorsed.dirs");
449 }
450
451 char* expanded_path = NULL;
452 const char separator = *os::path_separator();
453 const char* const end = path + strlen(path);
454 while (path < end) {
455 const char* tmp_end = strchr(path, separator);
456 if (tmp_end == NULL) {
457 expanded_path = add_jars_to_path(expanded_path, path);
458 path = end;
459 } else {
460 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
461 memcpy(dirpath, path, tmp_end - path);
462 dirpath[tmp_end - path] = '\0';
463 expanded_path = add_jars_to_path(expanded_path, dirpath);
464 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
465 path = tmp_end + 1;
466 }
467 }
468 _items[_scp_endorsed] = expanded_path;
469 DEBUG_ONLY(_expansion_done = true;)
470 }
471
472 // Combine the bootclasspath elements, some of which may be null, into a single
473 // c-heap-allocated string.
474 char* SysClassPath::combined_path() {
475 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
476 assert(_expansion_done, "must call expand_endorsed() first.");
477
478 size_t lengths[_scp_nitems];
479 size_t total_len = 0;
480
481 const char separator = *os::path_separator();
482
483 // Get the lengths.
484 int i;
485 for (i = 0; i < _scp_nitems; ++i) {
486 if (_items[i] != NULL) {
487 lengths[i] = strlen(_items[i]);
488 // Include space for the separator char (or a NULL for the last item).
489 total_len += lengths[i] + 1;
490 }
491 }
492 assert(total_len > 0, "empty sysclasspath not allowed");
493
494 // Copy the _items to a single string.
495 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
496 char* cp_tmp = cp;
497 for (i = 0; i < _scp_nitems; ++i) {
498 if (_items[i] != NULL) {
499 memcpy(cp_tmp, _items[i], lengths[i]);
500 cp_tmp += lengths[i];
501 *cp_tmp++ = separator;
502 }
503 }
504 *--cp_tmp = '\0'; // Replace the extra separator.
505 return cp;
506 }
507
508 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
509 char*
510 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
511 char *cp;
512
513 assert(str != NULL, "just checking");
514 if (path == NULL) {
515 size_t len = strlen(str) + 1;
516 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
517 memcpy(cp, str, len); // copy the trailing null
518 } else {
519 const char separator = *os::path_separator();
520 size_t old_len = strlen(path);
521 size_t str_len = strlen(str);
522 size_t len = old_len + str_len + 2;
523
524 if (prepend) {
525 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
526 char* cp_tmp = cp;
527 memcpy(cp_tmp, str, str_len);
528 cp_tmp += str_len;
529 *cp_tmp = separator;
530 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
531 FREE_C_HEAP_ARRAY(char, path, mtInternal);
532 } else {
533 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
534 char* cp_tmp = cp + old_len;
535 *cp_tmp = separator;
536 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
537 }
538 }
539 return cp;
540 }
541
542 // Scan the directory and append any jar or zip files found to path.
543 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
544 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
545 DIR* dir = os::opendir(directory);
546 if (dir == NULL) return path;
547
548 char dir_sep[2] = { '\0', '\0' };
549 size_t directory_len = strlen(directory);
550 const char fileSep = *os::file_separator();
551 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
552
553 /* Scan the directory for jars/zips, appending them to path. */
554 struct dirent *entry;
555 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
556 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
557 const char* name = entry->d_name;
558 const char* ext = name + strlen(name) - 4;
559 bool isJarOrZip = ext > name &&
560 (os::file_name_strcmp(ext, ".jar") == 0 ||
561 os::file_name_strcmp(ext, ".zip") == 0);
562 if (isJarOrZip) {
563 size_t length = directory_len + 2 + strlen(name);
564 char* jarpath = NEW_C_HEAP_ARRAY(char, length, mtInternal);
565 jio_snprintf(jarpath, length, "%s%s%s", directory, dir_sep, name);
566 path = add_to_path(path, jarpath, false);
567 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
568 }
569 }
570 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
571 os::closedir(dir);
572 return path;
573 }
574
575 // Parses a memory size specification string.
576 static bool atomull(const char *s, julong* result) {
577 julong n = 0;
578 int args_read = sscanf(s, JULONG_FORMAT, &n);
579 if (args_read != 1) {
580 return false;
581 }
582 while (*s != '\0' && isdigit(*s)) {
583 s++;
584 }
585 // 4705540: illegal if more characters are found after the first non-digit
586 if (strlen(s) > 1) {
587 return false;
588 }
589 switch (*s) {
590 case 'T': case 't':
591 *result = n * G * K;
592 // Check for overflow.
593 if (*result/((julong)G * K) != n) return false;
594 return true;
595 case 'G': case 'g':
596 *result = n * G;
597 if (*result/G != n) return false;
598 return true;
599 case 'M': case 'm':
600 *result = n * M;
601 if (*result/M != n) return false;
602 return true;
603 case 'K': case 'k':
604 *result = n * K;
605 if (*result/K != n) return false;
606 return true;
607 case '\0':
608 *result = n;
609 return true;
610 default:
611 return false;
612 }
613 }
614
615 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
616 if (size < min_size) return arg_too_small;
617 // Check that size will fit in a size_t (only relevant on 32-bit)
618 if (size > max_uintx) return arg_too_big;
619 return arg_in_range;
620 }
621
622 // Describe an argument out of range error
623 void Arguments::describe_range_error(ArgsRange errcode) {
624 switch(errcode) {
625 case arg_too_big:
626 jio_fprintf(defaultStream::error_stream(),
627 "The specified size exceeds the maximum "
628 "representable size.\n");
629 break;
630 case arg_too_small:
631 case arg_unreadable:
632 case arg_in_range:
633 // do nothing for now
634 break;
635 default:
636 ShouldNotReachHere();
637 }
638 }
639
640 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
641 return CommandLineFlags::boolAtPut(name, &value, origin);
642 }
643
644 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
645 double v;
646 if (sscanf(value, "%lf", &v) != 1) {
647 return false;
648 }
649
650 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
651 return true;
652 }
653 return false;
654 }
655
656 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
657 julong v;
658 intx intx_v;
659 bool is_neg = false;
660 // Check the sign first since atomull() parses only unsigned values.
661 if (*value == '-') {
662 if (!CommandLineFlags::intxAt(name, &intx_v)) {
663 return false;
664 }
665 value++;
666 is_neg = true;
667 }
668 if (!atomull(value, &v)) {
669 return false;
670 }
671 intx_v = (intx) v;
672 if (is_neg) {
673 intx_v = -intx_v;
674 }
675 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
676 return true;
677 }
678 uintx uintx_v = (uintx) v;
679 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
680 return true;
681 }
682 uint64_t uint64_t_v = (uint64_t) v;
683 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
684 return true;
685 }
686 return false;
687 }
688
689 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
690 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
691 // Contract: CommandLineFlags always returns a pointer that needs freeing.
692 FREE_C_HEAP_ARRAY(char, value, mtInternal);
693 return true;
694 }
695
696 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
697 const char* old_value = "";
698 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
699 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
700 size_t new_len = strlen(new_value);
701 const char* value;
702 char* free_this_too = NULL;
703 if (old_len == 0) {
704 value = new_value;
705 } else if (new_len == 0) {
706 value = old_value;
707 } else {
708 size_t length = old_len + 1 + new_len + 1;
709 char* buf = NEW_C_HEAP_ARRAY(char, length, mtInternal);
710 // each new setting adds another LINE to the switch:
711 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
712 value = buf;
713 free_this_too = buf;
714 }
715 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
716 // CommandLineFlags always returns a pointer that needs freeing.
717 FREE_C_HEAP_ARRAY(char, value, mtInternal);
718 if (free_this_too != NULL) {
719 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
720 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
721 }
722 return true;
723 }
724
725 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
726
727 // range of acceptable characters spelled out for portability reasons
728 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
729 #define BUFLEN 255
730 char name[BUFLEN+1];
731 char dummy;
732
733 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
734 return set_bool_flag(name, false, origin);
735 }
736 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
737 return set_bool_flag(name, true, origin);
738 }
739
740 char punct;
741 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
742 const char* value = strchr(arg, '=') + 1;
743 Flag* flag = Flag::find_flag(name, strlen(name));
744 if (flag != NULL && flag->is_ccstr()) {
745 if (flag->ccstr_accumulates()) {
746 return append_to_string_flag(name, value, origin);
747 } else {
748 if (value[0] == '\0') {
749 value = NULL;
750 }
751 return set_string_flag(name, value, origin);
752 }
753 }
754 }
755
756 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
757 const char* value = strchr(arg, '=') + 1;
758 // -XX:Foo:=xxx will reset the string flag to the given value.
759 if (value[0] == '\0') {
760 value = NULL;
761 }
762 return set_string_flag(name, value, origin);
763 }
764
765 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
766 #define SIGNED_NUMBER_RANGE "[-0123456789]"
767 #define NUMBER_RANGE "[0123456789]"
768 char value[BUFLEN + 1];
769 char value2[BUFLEN + 1];
770 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
771 // Looks like a floating-point number -- try again with more lenient format string
772 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
773 return set_fp_numeric_flag(name, value, origin);
774 }
775 }
776
777 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
778 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
779 return set_numeric_flag(name, value, origin);
780 }
781
782 return false;
783 }
784
785 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
786 assert(bldarray != NULL, "illegal argument");
787
788 if (arg == NULL) {
789 return;
790 }
791
792 int new_count = *count + 1;
793
794 // expand the array and add arg to the last element
795 if (*bldarray == NULL) {
796 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
797 } else {
798 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
799 }
800 (*bldarray)[*count] = strdup(arg);
801 *count = new_count;
802 }
803
804 void Arguments::build_jvm_args(const char* arg) {
805 add_string(&_jvm_args_array, &_num_jvm_args, arg);
806 }
807
808 void Arguments::build_jvm_flags(const char* arg) {
809 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
810 }
811
812 // utility function to return a string that concatenates all
813 // strings in a given char** array
814 const char* Arguments::build_resource_string(char** args, int count) {
815 if (args == NULL || count == 0) {
816 return NULL;
817 }
818 size_t length = 0;
819 for (int i = 0; i < count; i++) {
820 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
821 }
822 char* s = NEW_RESOURCE_ARRAY(char, length);
823 char* dst = s;
824 for (int j = 0; j < count; j++) {
825 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
826 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
827 dst += offset;
828 length -= offset;
829 }
830 return (const char*) s;
831 }
832
833 void Arguments::print_on(outputStream* st) {
834 st->print_cr("VM Arguments:");
835 if (num_jvm_flags() > 0) {
836 st->print("jvm_flags: "); print_jvm_flags_on(st);
837 }
838 if (num_jvm_args() > 0) {
839 st->print("jvm_args: "); print_jvm_args_on(st);
840 }
841 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
842 if (_java_class_path != NULL) {
843 char* path = _java_class_path->value();
844 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
845 }
846 st->print_cr("Launcher Type: %s", _sun_java_launcher);
847 }
848
849 void Arguments::print_jvm_flags_on(outputStream* st) {
850 if (_num_jvm_flags > 0) {
851 for (int i=0; i < _num_jvm_flags; i++) {
852 st->print("%s ", _jvm_flags_array[i]);
853 }
854 st->cr();
855 }
856 }
857
858 void Arguments::print_jvm_args_on(outputStream* st) {
859 if (_num_jvm_args > 0) {
860 for (int i=0; i < _num_jvm_args; i++) {
861 st->print("%s ", _jvm_args_array[i]);
862 }
863 st->cr();
864 }
865 }
866
867 bool Arguments::process_argument(const char* arg,
868 jboolean ignore_unrecognized, Flag::Flags origin) {
869
870 JDK_Version since = JDK_Version();
871
872 if (parse_argument(arg, origin) || ignore_unrecognized) {
873 return true;
874 }
875
876 bool has_plus_minus = (*arg == '+' || *arg == '-');
877 const char* const argname = has_plus_minus ? arg + 1 : arg;
878 if (is_newly_obsolete(arg, &since)) {
879 char version[256];
880 since.to_string(version, sizeof(version));
881 warning("ignoring option %s; support was removed in %s", argname, version);
882 return true;
883 }
884
885 // For locked flags, report a custom error message if available.
886 // Otherwise, report the standard unrecognized VM option.
887
888 size_t arg_len;
889 const char* equal_sign = strchr(argname, '=');
890 if (equal_sign == NULL) {
891 arg_len = strlen(argname);
892 } else {
893 arg_len = equal_sign - argname;
894 }
895
896 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
897 if (found_flag != NULL) {
898 char locked_message_buf[BUFLEN];
899 found_flag->get_locked_message(locked_message_buf, BUFLEN);
900 if (strlen(locked_message_buf) == 0) {
901 if (found_flag->is_bool() && !has_plus_minus) {
902 jio_fprintf(defaultStream::error_stream(),
903 "Missing +/- setting for VM option '%s'\n", argname);
904 } else if (!found_flag->is_bool() && has_plus_minus) {
905 jio_fprintf(defaultStream::error_stream(),
906 "Unexpected +/- setting in VM option '%s'\n", argname);
907 } else {
908 jio_fprintf(defaultStream::error_stream(),
909 "Improperly specified VM option '%s'\n", argname);
910 }
911 } else {
912 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
913 }
914 } else {
915 jio_fprintf(defaultStream::error_stream(),
916 "Unrecognized VM option '%s'\n", argname);
917 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
918 if (fuzzy_matched != NULL) {
919 jio_fprintf(defaultStream::error_stream(),
920 "Did you mean '%s%s%s'?\n",
921 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
922 fuzzy_matched->_name,
923 (fuzzy_matched->is_bool()) ? "" : "=<value>");
924 }
925 }
926
927 // allow for commandline "commenting out" options like -XX:#+Verbose
928 return arg[0] == '#';
929 }
930
931 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
932 FILE* stream = fopen(file_name, "rb");
933 if (stream == NULL) {
934 if (should_exist) {
935 jio_fprintf(defaultStream::error_stream(),
936 "Could not open settings file %s\n", file_name);
937 return false;
938 } else {
939 return true;
940 }
941 }
942
943 char token[1024];
944 int pos = 0;
945
946 bool in_white_space = true;
947 bool in_comment = false;
948 bool in_quote = false;
949 char quote_c = 0;
950 bool result = true;
951
952 int c = getc(stream);
953 while(c != EOF && pos < (int)(sizeof(token)-1)) {
954 if (in_white_space) {
955 if (in_comment) {
956 if (c == '\n') in_comment = false;
957 } else {
958 if (c == '#') in_comment = true;
959 else if (!isspace(c)) {
960 in_white_space = false;
961 token[pos++] = c;
962 }
963 }
964 } else {
965 if (c == '\n' || (!in_quote && isspace(c))) {
966 // token ends at newline, or at unquoted whitespace
967 // this allows a way to include spaces in string-valued options
968 token[pos] = '\0';
969 logOption(token);
970 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
971 build_jvm_flags(token);
972 pos = 0;
973 in_white_space = true;
974 in_quote = false;
975 } else if (!in_quote && (c == '\'' || c == '"')) {
976 in_quote = true;
977 quote_c = c;
978 } else if (in_quote && (c == quote_c)) {
979 in_quote = false;
980 } else {
981 token[pos++] = c;
982 }
983 }
984 c = getc(stream);
985 }
986 if (pos > 0) {
987 token[pos] = '\0';
988 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
989 build_jvm_flags(token);
990 }
991 fclose(stream);
992 return result;
993 }
994
995 //=============================================================================================================
996 // Parsing of properties (-D)
997
998 const char* Arguments::get_property(const char* key) {
999 return PropertyList_get_value(system_properties(), key);
1000 }
1001
1002 bool Arguments::add_property(const char* prop) {
1003 const char* eq = strchr(prop, '=');
1004 char* key;
1005 // ns must be static--its address may be stored in a SystemProperty object.
1006 const static char ns[1] = {0};
1007 char* value = (char *)ns;
1008
1009 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1010 key = AllocateHeap(key_len + 1, mtInternal);
1011 strncpy(key, prop, key_len);
1012 key[key_len] = '\0';
1013
1014 if (eq != NULL) {
1015 size_t value_len = strlen(prop) - key_len - 1;
1016 value = AllocateHeap(value_len + 1, mtInternal);
1017 strncpy(value, &prop[key_len + 1], value_len + 1);
1018 }
1019
1020 if (strcmp(key, "java.compiler") == 0) {
1021 process_java_compiler_argument(value);
1022 FreeHeap(key);
1023 if (eq != NULL) {
1024 FreeHeap(value);
1025 }
1026 return true;
1027 } else if (strcmp(key, "sun.java.command") == 0) {
1028 _java_command = value;
1029
1030 // Record value in Arguments, but let it get passed to Java.
1031 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1032 // launcher.pid property is private and is processed
1033 // in process_sun_java_launcher_properties();
1034 // the sun.java.launcher property is passed on to the java application
1035 FreeHeap(key);
1036 if (eq != NULL) {
1037 FreeHeap(value);
1038 }
1039 return true;
1040 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1041 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1042 // its value without going through the property list or making a Java call.
1043 _java_vendor_url_bug = value;
1044 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1045 PropertyList_unique_add(&_system_properties, key, value, true);
1046 return true;
1047 }
1048 // Create new property and add at the end of the list
1049 PropertyList_unique_add(&_system_properties, key, value);
1050 return true;
1051 }
1052
1053 //===========================================================================================================
1054 // Setting int/mixed/comp mode flags
1055
1056 void Arguments::set_mode_flags(Mode mode) {
1057 // Set up default values for all flags.
1058 // If you add a flag to any of the branches below,
1059 // add a default value for it here.
1060 set_java_compiler(false);
1061 _mode = mode;
1062
1063 // Ensure Agent_OnLoad has the correct initial values.
1064 // This may not be the final mode; mode may change later in onload phase.
1065 PropertyList_unique_add(&_system_properties, "java.vm.info",
1066 (char*)VM_Version::vm_info_string(), false);
1067
1068 UseInterpreter = true;
1069 UseCompiler = true;
1070 UseLoopCounter = true;
1071
1072 #ifndef ZERO
1073 // Turn these off for mixed and comp. Leave them on for Zero.
1074 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1075 UseFastAccessorMethods = (mode == _int);
1076 }
1077 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1078 UseFastEmptyMethods = (mode == _int);
1079 }
1080 #endif
1081
1082 // Default values may be platform/compiler dependent -
1083 // use the saved values
1084 ClipInlining = Arguments::_ClipInlining;
1085 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1086 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1087 BackgroundCompilation = Arguments::_BackgroundCompilation;
1088
1089 // Change from defaults based on mode
1090 switch (mode) {
1091 default:
1092 ShouldNotReachHere();
1093 break;
1094 case _int:
1095 UseCompiler = false;
1096 UseLoopCounter = false;
1097 AlwaysCompileLoopMethods = false;
1098 UseOnStackReplacement = false;
1099 break;
1100 case _mixed:
1101 // same as default
1102 break;
1103 case _comp:
1104 UseInterpreter = false;
1105 BackgroundCompilation = false;
1106 ClipInlining = false;
1107 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1108 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1109 // compile a level 4 (C2) and then continue executing it.
1110 if (TieredCompilation) {
1111 Tier3InvokeNotifyFreqLog = 0;
1112 Tier4InvocationThreshold = 0;
1113 }
1114 break;
1115 }
1116 }
1117
1118 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1119 // Conflict: required to use shared spaces (-Xshare:on), but
1120 // incompatible command line options were chosen.
1121
1122 static void no_shared_spaces(const char* message) {
1123 if (RequireSharedSpaces) {
1124 jio_fprintf(defaultStream::error_stream(),
1125 "Class data sharing is inconsistent with other specified options.\n");
1126 vm_exit_during_initialization("Unable to use shared archive.", message);
1127 } else {
1128 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1129 }
1130 }
1131 #endif
1132
1133 void Arguments::set_tiered_flags() {
1134 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1135 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1136 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1137 }
1138 if (CompilationPolicyChoice < 2) {
1139 vm_exit_during_initialization(
1140 "Incompatible compilation policy selected", NULL);
1141 }
1142 // Increase the code cache size - tiered compiles a lot more.
1143 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1144 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1145 }
1146 if (!UseInterpreter) { // -Xcomp
1147 Tier3InvokeNotifyFreqLog = 0;
1148 Tier4InvocationThreshold = 0;
1149 }
1150 }
1151
1152 /**
1153 * Returns the minimum number of compiler threads needed to run the JVM. The following
1154 * configurations are possible.
1155 *
1156 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1157 * compiler threads is 0.
1158 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1159 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1160 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1161 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1162 * C1 can be used, so the minimum number of compiler threads is 1.
1163 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1164 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1165 * the minimum number of compiler threads is 2.
1166 */
1167 int Arguments::get_min_number_of_compiler_threads() {
1168 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1169 return 0; // case 1
1170 #else
1171 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1172 return 1; // case 2 or case 3
1173 }
1174 return 2; // case 4 (tiered)
1175 #endif
1176 }
1177
1178 #if INCLUDE_ALL_GCS
1179 static void disable_adaptive_size_policy(const char* collector_name) {
1180 if (UseAdaptiveSizePolicy) {
1181 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1182 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1183 collector_name);
1184 }
1185 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1186 }
1187 }
1188
1189 void Arguments::set_parnew_gc_flags() {
1190 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1191 "control point invariant");
1192 assert(UseParNewGC, "Error");
1193
1194 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1195 disable_adaptive_size_policy("UseParNewGC");
1196
1197 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1198 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1199 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1200 } else if (ParallelGCThreads == 0) {
1201 jio_fprintf(defaultStream::error_stream(),
1202 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1203 vm_exit(1);
1204 }
1205
1206 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1207 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1208 // we set them to 1024 and 1024.
1209 // See CR 6362902.
1210 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1211 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1212 }
1213 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1214 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1215 }
1216
1217 // AlwaysTenure flag should make ParNew promote all at first collection.
1218 // See CR 6362902.
1219 if (AlwaysTenure) {
1220 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1221 }
1222 // When using compressed oops, we use local overflow stacks,
1223 // rather than using a global overflow list chained through
1224 // the klass word of the object's pre-image.
1225 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1226 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1227 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1228 }
1229 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1230 }
1231 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1232 }
1233
1234 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1235 // sparc/solaris for certain applications, but would gain from
1236 // further optimization and tuning efforts, and would almost
1237 // certainly gain from analysis of platform and environment.
1238 void Arguments::set_cms_and_parnew_gc_flags() {
1239 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1240 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1241
1242 // If we are using CMS, we prefer to UseParNewGC,
1243 // unless explicitly forbidden.
1244 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1245 FLAG_SET_ERGO(bool, UseParNewGC, true);
1246 }
1247
1248 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1249 disable_adaptive_size_policy("UseConcMarkSweepGC");
1250
1251 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1252 // as needed.
1253 if (UseParNewGC) {
1254 set_parnew_gc_flags();
1255 }
1256
1257 size_t max_heap = align_size_down(MaxHeapSize,
1258 CardTableRS::ct_max_alignment_constraint());
1259
1260 // Now make adjustments for CMS
1261 intx tenuring_default = (intx)6;
1262 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1263
1264 // Preferred young gen size for "short" pauses:
1265 // upper bound depends on # of threads and NewRatio.
1266 const uintx parallel_gc_threads =
1267 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1268 const size_t preferred_max_new_size_unaligned =
1269 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1270 size_t preferred_max_new_size =
1271 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1272
1273 // Unless explicitly requested otherwise, size young gen
1274 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1275
1276 // If either MaxNewSize or NewRatio is set on the command line,
1277 // assume the user is trying to set the size of the young gen.
1278 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1279
1280 // Set MaxNewSize to our calculated preferred_max_new_size unless
1281 // NewSize was set on the command line and it is larger than
1282 // preferred_max_new_size.
1283 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1284 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1285 } else {
1286 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1287 }
1288 if (PrintGCDetails && Verbose) {
1289 // Too early to use gclog_or_tty
1290 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1291 }
1292
1293 // Code along this path potentially sets NewSize and OldSize
1294 if (PrintGCDetails && Verbose) {
1295 // Too early to use gclog_or_tty
1296 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1297 " initial_heap_size: " SIZE_FORMAT
1298 " max_heap: " SIZE_FORMAT,
1299 min_heap_size(), InitialHeapSize, max_heap);
1300 }
1301 size_t min_new = preferred_max_new_size;
1302 if (FLAG_IS_CMDLINE(NewSize)) {
1303 min_new = NewSize;
1304 }
1305 if (max_heap > min_new && min_heap_size() > min_new) {
1306 // Unless explicitly requested otherwise, make young gen
1307 // at least min_new, and at most preferred_max_new_size.
1308 if (FLAG_IS_DEFAULT(NewSize)) {
1309 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1310 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1311 if (PrintGCDetails && Verbose) {
1312 // Too early to use gclog_or_tty
1313 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1314 }
1315 }
1316 // Unless explicitly requested otherwise, size old gen
1317 // so it's NewRatio x of NewSize.
1318 if (FLAG_IS_DEFAULT(OldSize)) {
1319 if (max_heap > NewSize) {
1320 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1321 if (PrintGCDetails && Verbose) {
1322 // Too early to use gclog_or_tty
1323 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1324 }
1325 }
1326 }
1327 }
1328 }
1329 // Unless explicitly requested otherwise, definitely
1330 // promote all objects surviving "tenuring_default" scavenges.
1331 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1332 FLAG_IS_DEFAULT(SurvivorRatio)) {
1333 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1334 }
1335 // If we decided above (or user explicitly requested)
1336 // `promote all' (via MaxTenuringThreshold := 0),
1337 // prefer minuscule survivor spaces so as not to waste
1338 // space for (non-existent) survivors
1339 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1340 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1341 }
1342 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1343 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1344 // This is done in order to make ParNew+CMS configuration to work
1345 // with YoungPLABSize and OldPLABSize options.
1346 // See CR 6362902.
1347 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1348 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1349 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1350 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1351 // the value (either from the command line or ergonomics) of
1352 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1353 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1354 } else {
1355 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1356 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1357 // we'll let it to take precedence.
1358 jio_fprintf(defaultStream::error_stream(),
1359 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1360 " options are specified for the CMS collector."
1361 " CMSParPromoteBlocksToClaim will take precedence.\n");
1362 }
1363 }
1364 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1365 // OldPLAB sizing manually turned off: Use a larger default setting,
1366 // unless it was manually specified. This is because a too-low value
1367 // will slow down scavenges.
1368 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1369 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1370 }
1371 }
1372 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1373 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1374 // If either of the static initialization defaults have changed, note this
1375 // modification.
1376 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1377 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1378 }
1379
1380 if (PrintGCDetails && Verbose) {
1381 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1382 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1383 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1384 }
1385 }
1386 #endif // INCLUDE_ALL_GCS
1387
1388 void set_object_alignment() {
1389 // Object alignment.
1390 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1391 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1392 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1393 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1394 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1395 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1396
1397 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1398 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1399
1400 // Oop encoding heap max
1401 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1402
1403 #if INCLUDE_ALL_GCS
1404 // Set CMS global values
1405 CompactibleFreeListSpace::set_cms_values();
1406 #endif // INCLUDE_ALL_GCS
1407 }
1408
1409 bool verify_object_alignment() {
1410 // Object alignment.
1411 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1412 jio_fprintf(defaultStream::error_stream(),
1413 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1414 (int)ObjectAlignmentInBytes);
1415 return false;
1416 }
1417 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1418 jio_fprintf(defaultStream::error_stream(),
1419 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1420 (int)ObjectAlignmentInBytes, BytesPerLong);
1421 return false;
1422 }
1423 // It does not make sense to have big object alignment
1424 // since a space lost due to alignment will be greater
1425 // then a saved space from compressed oops.
1426 if ((int)ObjectAlignmentInBytes > 256) {
1427 jio_fprintf(defaultStream::error_stream(),
1428 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1429 (int)ObjectAlignmentInBytes);
1430 return false;
1431 }
1432 // In case page size is very small.
1433 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1434 jio_fprintf(defaultStream::error_stream(),
1435 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1436 (int)ObjectAlignmentInBytes, os::vm_page_size());
1437 return false;
1438 }
1439 if(SurvivorAlignmentInBytes == 0) {
1440 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1441 } else {
1442 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1443 jio_fprintf(defaultStream::error_stream(),
1444 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1445 (int)SurvivorAlignmentInBytes);
1446 return false;
1447 }
1448 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1449 jio_fprintf(defaultStream::error_stream(),
1450 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1451 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1452 return false;
1453 }
1454 }
1455 return true;
1456 }
1457
1458 size_t Arguments::max_heap_for_compressed_oops() {
1459 // Avoid sign flip.
1460 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1461 // We need to fit both the NULL page and the heap into the memory budget, while
1462 // keeping alignment constraints of the heap. To guarantee the latter, as the
1463 // NULL page is located before the heap, we pad the NULL page to the conservative
1464 // maximum alignment that the GC may ever impose upon the heap.
1465 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1466 _conservative_max_heap_alignment);
1467
1468 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1469 NOT_LP64(ShouldNotReachHere(); return 0);
1470 }
1471
1472 bool Arguments::should_auto_select_low_pause_collector() {
1473 if (UseAutoGCSelectPolicy &&
1474 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1475 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1476 if (PrintGCDetails) {
1477 // Cannot use gclog_or_tty yet.
1478 tty->print_cr("Automatic selection of the low pause collector"
1479 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1480 }
1481 return true;
1482 }
1483 return false;
1484 }
1485
1486 void Arguments::set_use_compressed_oops() {
1487 #ifndef ZERO
1488 #ifdef _LP64
1489 // MaxHeapSize is not set up properly at this point, but
1490 // the only value that can override MaxHeapSize if we are
1491 // to use UseCompressedOops is InitialHeapSize.
1492 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1493
1494 if (max_heap_size <= max_heap_for_compressed_oops()) {
1495 #if !defined(COMPILER1) || defined(TIERED)
1496 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1497 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1498 }
1499 #endif
1500 #ifdef _WIN64
1501 if (UseLargePages && UseCompressedOops) {
1502 // Cannot allocate guard pages for implicit checks in indexed addressing
1503 // mode, when large pages are specified on windows.
1504 // This flag could be switched ON if narrow oop base address is set to 0,
1505 // see code in Universe::initialize_heap().
1506 Universe::set_narrow_oop_use_implicit_null_checks(false);
1507 }
1508 #endif // _WIN64
1509 } else {
1510 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1511 warning("Max heap size too large for Compressed Oops");
1512 FLAG_SET_DEFAULT(UseCompressedOops, false);
1513 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1514 }
1515 }
1516 #endif // _LP64
1517 #endif // ZERO
1518 }
1519
1520
1521 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1522 // set_use_compressed_oops().
1523 void Arguments::set_use_compressed_klass_ptrs() {
1524 #ifndef ZERO
1525 #ifdef _LP64
1526 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1527 if (!UseCompressedOops) {
1528 if (UseCompressedClassPointers) {
1529 warning("UseCompressedClassPointers requires UseCompressedOops");
1530 }
1531 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1532 } else {
1533 // Turn on UseCompressedClassPointers too
1534 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1535 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1536 }
1537 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1538 if (UseCompressedClassPointers) {
1539 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1540 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1541 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1542 }
1543 }
1544 }
1545 #endif // _LP64
1546 #endif // !ZERO
1547 }
1548
1549 void Arguments::set_conservative_max_heap_alignment() {
1550 // The conservative maximum required alignment for the heap is the maximum of
1551 // the alignments imposed by several sources: any requirements from the heap
1552 // itself, the collector policy and the maximum page size we may run the VM
1553 // with.
1554 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1555 #if INCLUDE_ALL_GCS
1556 if (UseParallelGC) {
1557 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1558 } else if (UseG1GC) {
1559 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1560 }
1561 #endif // INCLUDE_ALL_GCS
1562 _conservative_max_heap_alignment = MAX4(heap_alignment,
1563 (size_t)os::vm_allocation_granularity(),
1564 os::max_page_size(),
1565 CollectorPolicy::compute_heap_alignment());
1566 }
1567
1568 void Arguments::select_gc_ergonomically() {
1569 if (os::is_server_class_machine()) {
1570 if (should_auto_select_low_pause_collector()) {
1571 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1572 } else {
1573 FLAG_SET_ERGO(bool, UseParallelGC, true);
1574 }
1575 }
1576 }
1577
1578 void Arguments::select_gc() {
1579 if (!gc_selected()) {
1580 select_gc_ergonomically();
1581 }
1582 }
1583
1584 void Arguments::set_ergonomics_flags() {
1585 select_gc();
1586
1587 #ifdef COMPILER2
1588 // Shared spaces work fine with other GCs but causes bytecode rewriting
1589 // to be disabled, which hurts interpreter performance and decreases
1590 // server performance. When -server is specified, keep the default off
1591 // unless it is asked for. Future work: either add bytecode rewriting
1592 // at link time, or rewrite bytecodes in non-shared methods.
1593 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1594 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1595 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1596 }
1597 #endif
1598
1599 set_conservative_max_heap_alignment();
1600
1601 #ifndef ZERO
1602 #ifdef _LP64
1603 set_use_compressed_oops();
1604
1605 // set_use_compressed_klass_ptrs() must be called after calling
1606 // set_use_compressed_oops().
1607 set_use_compressed_klass_ptrs();
1608
1609 // Also checks that certain machines are slower with compressed oops
1610 // in vm_version initialization code.
1611 #endif // _LP64
1612 #endif // !ZERO
1613 }
1614
1615 void Arguments::set_parallel_gc_flags() {
1616 assert(UseParallelGC || UseParallelOldGC, "Error");
1617 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1618 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1619 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1620 }
1621 FLAG_SET_DEFAULT(UseParallelGC, true);
1622
1623 // If no heap maximum was requested explicitly, use some reasonable fraction
1624 // of the physical memory, up to a maximum of 1GB.
1625 FLAG_SET_DEFAULT(ParallelGCThreads,
1626 Abstract_VM_Version::parallel_worker_threads());
1627 if (ParallelGCThreads == 0) {
1628 jio_fprintf(defaultStream::error_stream(),
1629 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1630 vm_exit(1);
1631 }
1632
1633 if (UseAdaptiveSizePolicy) {
1634 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1635 // unless the user actually sets these flags.
1636 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1637 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1638 _min_heap_free_ratio = MinHeapFreeRatio;
1639 }
1640 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1641 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1642 _max_heap_free_ratio = MaxHeapFreeRatio;
1643 }
1644 }
1645
1646 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1647 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1648 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1649 // See CR 6362902 for details.
1650 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1651 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1652 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1653 }
1654 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1655 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1656 }
1657 }
1658
1659 if (UseParallelOldGC) {
1660 // Par compact uses lower default values since they are treated as
1661 // minimums. These are different defaults because of the different
1662 // interpretation and are not ergonomically set.
1663 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1664 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1665 }
1666 }
1667 }
1668
1669 void Arguments::set_g1_gc_flags() {
1670 assert(UseG1GC, "Error");
1671 #ifdef COMPILER1
1672 FastTLABRefill = false;
1673 #endif
1674 FLAG_SET_DEFAULT(ParallelGCThreads,
1675 Abstract_VM_Version::parallel_worker_threads());
1676 if (ParallelGCThreads == 0) {
1677 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1678 }
1679
1680 #if INCLUDE_ALL_GCS
1681 if (G1ConcRefinementThreads == 0) {
1682 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1683 }
1684 #endif
1685
1686 // MarkStackSize will be set (if it hasn't been set by the user)
1687 // when concurrent marking is initialized.
1688 // Its value will be based upon the number of parallel marking threads.
1689 // But we do set the maximum mark stack size here.
1690 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1691 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1692 }
1693
1694 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1695 // In G1, we want the default GC overhead goal to be higher than
1696 // say in PS. So we set it here to 10%. Otherwise the heap might
1697 // be expanded more aggressively than we would like it to. In
1698 // fact, even 10% seems to not be high enough in some cases
1699 // (especially small GC stress tests that the main thing they do
1700 // is allocation). We might consider increase it further.
1701 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1702 }
1703
1704 if (PrintGCDetails && Verbose) {
1705 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1706 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1707 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1708 }
1709 }
1710
1711 #if !INCLUDE_ALL_GCS
1712 #ifdef ASSERT
1713 static bool verify_serial_gc_flags() {
1714 return (UseSerialGC &&
1715 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1716 UseParallelGC || UseParallelOldGC));
1717 }
1718 #endif // ASSERT
1719 #endif // INCLUDE_ALL_GCS
1720
1721 void Arguments::set_gc_specific_flags() {
1722 #if INCLUDE_ALL_GCS
1723 // Set per-collector flags
1724 if (UseParallelGC || UseParallelOldGC) {
1725 set_parallel_gc_flags();
1726 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1727 set_cms_and_parnew_gc_flags();
1728 } else if (UseParNewGC) { // Skipped if CMS is set above
1729 set_parnew_gc_flags();
1730 } else if (UseG1GC) {
1731 set_g1_gc_flags();
1732 }
1733 check_deprecated_gcs();
1734 check_deprecated_gc_flags();
1735 if (AssumeMP && !UseSerialGC) {
1736 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1737 warning("If the number of processors is expected to increase from one, then"
1738 " you should configure the number of parallel GC threads appropriately"
1739 " using -XX:ParallelGCThreads=N");
1740 }
1741 }
1742 if (MinHeapFreeRatio == 100) {
1743 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1744 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1745 }
1746
1747 // If class unloading is disabled, also disable concurrent class unloading.
1748 if (!ClassUnloading) {
1749 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1750 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
1751 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1752 }
1753 #else // INCLUDE_ALL_GCS
1754 assert(verify_serial_gc_flags(), "SerialGC unset");
1755 #endif // INCLUDE_ALL_GCS
1756 }
1757
1758 julong Arguments::limit_by_allocatable_memory(julong limit) {
1759 julong max_allocatable;
1760 julong result = limit;
1761 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1762 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1763 }
1764 return result;
1765 }
1766
1767 void Arguments::set_heap_size() {
1768 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1769 // Deprecated flag
1770 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1771 }
1772
1773 julong phys_mem =
1774 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1775 : (julong)MaxRAM;
1776
1777 // Experimental support for CGroup memory limits
1778 if (UseCGroupMemoryLimitForHeap) {
1779 // This is a rough indicator that a CGroup limit may be in force
1780 // for this process
1781 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1782 FILE *fp = fopen(lim_file, "r");
1783 if (fp != NULL) {
1784 julong cgroup_max = 0;
1785 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
1786 if (ret == 1 && cgroup_max > 0) {
1787 // If unlimited, cgroup_max will be a very large, but unspecified
1788 // value, so use initial phys_mem as a limit
1789 if (PrintGCDetails && Verbose) {
1790 // Cannot use gclog_or_tty yet.
1791 tty->print_cr("Setting phys_mem to the min of cgroup limit ("
1792 JULONG_FORMAT "MB) and initial phys_mem ("
1793 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
1794 }
1795 phys_mem = MIN2(cgroup_max, phys_mem);
1796 } else {
1797 warning("Unable to read/parse cgroup memory limit from %s: %s",
1798 lim_file, errno != 0 ? strerror(errno) : "unknown error");
1799 }
1800 fclose(fp);
1801 } else {
1802 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
1803 }
1804 }
1805
1806 // Convert Fraction to Precentage values
1807 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
1808 !FLAG_IS_DEFAULT(MaxRAMFraction))
1809 MaxRAMPercentage = 100.0 / MaxRAMFraction;
1810
1811 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
1812 !FLAG_IS_DEFAULT(MinRAMFraction))
1813 MinRAMPercentage = 100.0 / MinRAMFraction;
1814
1815 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
1816 !FLAG_IS_DEFAULT(InitialRAMFraction))
1817 InitialRAMPercentage = 100.0 / InitialRAMFraction;
1818
1819 // If the maximum heap size has not been set with -Xmx,
1820 // then set it as fraction of the size of physical memory,
1821 // respecting the maximum and minimum sizes of the heap.
1822 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1823 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
1824 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
1825 if (reasonable_min < MaxHeapSize) {
1826 // Small physical memory, so use a minimum fraction of it for the heap
1827 reasonable_max = reasonable_min;
1828 } else {
1829 // Not-small physical memory, so require a heap at least
1830 // as large as MaxHeapSize
1831 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1832 }
1833
1834 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1835 // Limit the heap size to ErgoHeapSizeLimit
1836 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1837 }
1838 if (UseCompressedOops) {
1839 // Limit the heap size to the maximum possible when using compressed oops
1840 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1841 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1842 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1843 // but it should be not less than default MaxHeapSize.
1844 max_coop_heap -= HeapBaseMinAddress;
1845 }
1846 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1847 }
1848 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1849
1850 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1851 // An initial heap size was specified on the command line,
1852 // so be sure that the maximum size is consistent. Done
1853 // after call to limit_by_allocatable_memory because that
1854 // method might reduce the allocation size.
1855 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1856 }
1857
1858 if (PrintGCDetails && Verbose) {
1859 // Cannot use gclog_or_tty yet.
1860 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1861 }
1862 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1863 }
1864
1865 // If the minimum or initial heap_size have not been set or requested to be set
1866 // ergonomically, set them accordingly.
1867 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1868 julong reasonable_minimum = (julong)(OldSize + NewSize);
1869
1870 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1871
1872 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1873
1874 if (InitialHeapSize == 0) {
1875 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
1876
1877 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1878 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1879
1880 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1881
1882 if (PrintGCDetails && Verbose) {
1883 // Cannot use gclog_or_tty yet.
1884 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1885 }
1886 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1887 }
1888 // If the minimum heap size has not been set (via -Xms),
1889 // synchronize with InitialHeapSize to avoid errors with the default value.
1890 if (min_heap_size() == 0) {
1891 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1892 if (PrintGCDetails && Verbose) {
1893 // Cannot use gclog_or_tty yet.
1894 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1895 }
1896 }
1897 }
1898 }
1899
1900 // This option inspects the machine and attempts to set various
1901 // parameters to be optimal for long-running, memory allocation
1902 // intensive jobs. It is intended for machines with large
1903 // amounts of cpu and memory.
1904 jint Arguments::set_aggressive_heap_flags() {
1905 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1906 // VM, but we may not be able to represent the total physical memory
1907 // available (like having 8gb of memory on a box but using a 32bit VM).
1908 // Thus, we need to make sure we're using a julong for intermediate
1909 // calculations.
1910 julong initHeapSize;
1911 julong total_memory = os::physical_memory();
1912
1913 if (total_memory < (julong) 256 * M) {
1914 jio_fprintf(defaultStream::error_stream(),
1915 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
1916 vm_exit(1);
1917 }
1918
1919 // The heap size is half of available memory, or (at most)
1920 // all of possible memory less 160mb (leaving room for the OS
1921 // when using ISM). This is the maximum; because adaptive sizing
1922 // is turned on below, the actual space used may be smaller.
1923
1924 initHeapSize = MIN2(total_memory / (julong) 2,
1925 total_memory - (julong) 160 * M);
1926
1927 initHeapSize = limit_by_allocatable_memory(initHeapSize);
1928
1929 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1930 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
1931 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
1932 // Currently the minimum size and the initial heap sizes are the same.
1933 set_min_heap_size(initHeapSize);
1934 }
1935 if (FLAG_IS_DEFAULT(NewSize)) {
1936 // Make the young generation 3/8ths of the total heap.
1937 FLAG_SET_CMDLINE(uintx, NewSize,
1938 ((julong) MaxHeapSize / (julong) 8) * (julong) 3);
1939 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
1940 }
1941
1942 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
1943 FLAG_SET_DEFAULT(UseLargePages, true);
1944 #endif
1945
1946 // Increase some data structure sizes for efficiency
1947 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
1948 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
1949 FLAG_SET_CMDLINE(uintx, TLABSize, 256 * K);
1950
1951 // See the OldPLABSize comment below, but replace 'after promotion'
1952 // with 'after copying'. YoungPLABSize is the size of the survivor
1953 // space per-gc-thread buffers. The default is 4kw.
1954 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256 * K); // Note: this is in words
1955
1956 // OldPLABSize is the size of the buffers in the old gen that
1957 // UseParallelGC uses to promote live data that doesn't fit in the
1958 // survivor spaces. At any given time, there's one for each gc thread.
1959 // The default size is 1kw. These buffers are rarely used, since the
1960 // survivor spaces are usually big enough. For specjbb, however, there
1961 // are occasions when there's lots of live data in the young gen
1962 // and we end up promoting some of it. We don't have a definite
1963 // explanation for why bumping OldPLABSize helps, but the theory
1964 // is that a bigger PLAB results in retaining something like the
1965 // original allocation order after promotion, which improves mutator
1966 // locality. A minor effect may be that larger PLABs reduce the
1967 // number of PLAB allocation events during gc. The value of 8kw
1968 // was arrived at by experimenting with specjbb.
1969 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8 * K); // Note: this is in words
1970
1971 // Enable parallel GC and adaptive generation sizing
1972 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
1973
1974 // Encourage steady state memory management
1975 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
1976
1977 // This appears to improve mutator locality
1978 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1979
1980 // Get around early Solaris scheduling bug
1981 // (affinity vs other jobs on system)
1982 // but disallow DR and offlining (5008695).
1983 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
1984
1985 return JNI_OK;
1986 }
1987
1988 // This must be called after ergonomics because we want bytecode rewriting
1989 // if the server compiler is used, or if UseSharedSpaces is disabled.
1990 void Arguments::set_bytecode_flags() {
1991 // Better not attempt to store into a read-only space.
1992 if (UseSharedSpaces) {
1993 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1994 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1995 }
1996
1997 if (!RewriteBytecodes) {
1998 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1999 }
2000 }
2001
2002 // Aggressive optimization flags -XX:+AggressiveOpts
2003 void Arguments::set_aggressive_opts_flags() {
2004 #ifdef COMPILER2
2005 if (AggressiveUnboxing) {
2006 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2007 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2008 } else if (!EliminateAutoBox) {
2009 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2010 AggressiveUnboxing = false;
2011 }
2012 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2013 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2014 } else if (!DoEscapeAnalysis) {
2015 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2016 AggressiveUnboxing = false;
2017 }
2018 }
2019 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2020 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2021 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2022 }
2023 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2024 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2025 }
2026
2027 // Feed the cache size setting into the JDK
2028 char buffer[1024];
2029 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2030 add_property(buffer);
2031 }
2032 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2033 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2034 }
2035 #endif
2036
2037 if (AggressiveOpts) {
2038 // Sample flag setting code
2039 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2040 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2041 // }
2042 }
2043 }
2044
2045 //===========================================================================================================
2046 // Parsing of java.compiler property
2047
2048 void Arguments::process_java_compiler_argument(char* arg) {
2049 // For backwards compatibility, Djava.compiler=NONE or ""
2050 // causes us to switch to -Xint mode UNLESS -Xdebug
2051 // is also specified.
2052 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2053 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2054 }
2055 }
2056
2057 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2058 _sun_java_launcher = strdup(launcher);
2059 if (strcmp("gamma", _sun_java_launcher) == 0) {
2060 _created_by_gamma_launcher = true;
2061 }
2062 }
2063
2064 bool Arguments::created_by_java_launcher() {
2065 assert(_sun_java_launcher != NULL, "property must have value");
2066 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2067 }
2068
2069 bool Arguments::created_by_gamma_launcher() {
2070 return _created_by_gamma_launcher;
2071 }
2072
2073 //===========================================================================================================
2074 // Parsing of main arguments
2075
2076 bool Arguments::verify_interval(uintx val, uintx min,
2077 uintx max, const char* name) {
2078 // Returns true iff value is in the inclusive interval [min..max]
2079 // false, otherwise.
2080 if (val >= min && val <= max) {
2081 return true;
2082 }
2083 jio_fprintf(defaultStream::error_stream(),
2084 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
2085 " and " UINTX_FORMAT "\n",
2086 name, val, min, max);
2087 return false;
2088 }
2089
2090 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2091 // Returns true if given value is at least specified min threshold
2092 // false, otherwise.
2093 if (val >= min ) {
2094 return true;
2095 }
2096 jio_fprintf(defaultStream::error_stream(),
2097 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2098 name, val, min);
2099 return false;
2100 }
2101
2102 bool Arguments::verify_percentage(uintx value, const char* name) {
2103 if (is_percentage(value)) {
2104 return true;
2105 }
2106 jio_fprintf(defaultStream::error_stream(),
2107 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2108 name, value);
2109 return false;
2110 }
2111
2112 // check if do gclog rotation
2113 // +UseGCLogFileRotation is a must,
2114 // no gc log rotation when log file not supplied or
2115 // NumberOfGCLogFiles is 0
2116 void check_gclog_consistency() {
2117 if (UseGCLogFileRotation) {
2118 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2119 jio_fprintf(defaultStream::output_stream(),
2120 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2121 "where num_of_file > 0\n"
2122 "GC log rotation is turned off\n");
2123 UseGCLogFileRotation = false;
2124 }
2125 }
2126
2127 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2128 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2129 jio_fprintf(defaultStream::output_stream(),
2130 "GCLogFileSize changed to minimum 8K\n");
2131 }
2132 }
2133
2134 // This function is called for -Xloggc:<filename>, it can be used
2135 // to check if a given file name(or string) conforms to the following
2136 // specification:
2137 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2138 // %p and %t only allowed once. We only limit usage of filename not path
2139 bool is_filename_valid(const char *file_name) {
2140 const char* p = file_name;
2141 char file_sep = os::file_separator()[0];
2142 const char* cp;
2143 // skip prefix path
2144 for (cp = file_name; *cp != '\0'; cp++) {
2145 if (*cp == '/' || *cp == file_sep) {
2146 p = cp + 1;
2147 }
2148 }
2149
2150 int count_p = 0;
2151 int count_t = 0;
2152 while (*p != '\0') {
2153 if ((*p >= '0' && *p <= '9') ||
2154 (*p >= 'A' && *p <= 'Z') ||
2155 (*p >= 'a' && *p <= 'z') ||
2156 *p == '-' ||
2157 *p == '_' ||
2158 *p == '.') {
2159 p++;
2160 continue;
2161 }
2162 if (*p == '%') {
2163 if(*(p + 1) == 'p') {
2164 p += 2;
2165 count_p ++;
2166 continue;
2167 }
2168 if (*(p + 1) == 't') {
2169 p += 2;
2170 count_t ++;
2171 continue;
2172 }
2173 }
2174 return false;
2175 }
2176 return count_p < 2 && count_t < 2;
2177 }
2178
2179 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2180 if (!is_percentage(min_heap_free_ratio)) {
2181 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2182 return false;
2183 }
2184 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2185 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2186 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2187 MaxHeapFreeRatio);
2188 return false;
2189 }
2190 // This does not set the flag itself, but stores the value in a safe place for later usage.
2191 _min_heap_free_ratio = min_heap_free_ratio;
2192 return true;
2193 }
2194
2195 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2196 if (!is_percentage(max_heap_free_ratio)) {
2197 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2198 return false;
2199 }
2200 if (max_heap_free_ratio < MinHeapFreeRatio) {
2201 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2202 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2203 MinHeapFreeRatio);
2204 return false;
2205 }
2206 // This does not set the flag itself, but stores the value in a safe place for later usage.
2207 _max_heap_free_ratio = max_heap_free_ratio;
2208 return true;
2209 }
2210
2211 // Check consistency of GC selection
2212 bool Arguments::check_gc_consistency() {
2213 check_gclog_consistency();
2214 bool status = true;
2215 // Ensure that the user has not selected conflicting sets
2216 // of collectors. [Note: this check is merely a user convenience;
2217 // collectors over-ride each other so that only a non-conflicting
2218 // set is selected; however what the user gets is not what they
2219 // may have expected from the combination they asked for. It's
2220 // better to reduce user confusion by not allowing them to
2221 // select conflicting combinations.
2222 uint i = 0;
2223 if (UseSerialGC) i++;
2224 if (UseConcMarkSweepGC || UseParNewGC) i++;
2225 if (UseParallelGC || UseParallelOldGC) i++;
2226 if (UseG1GC) i++;
2227 if (i > 1) {
2228 jio_fprintf(defaultStream::error_stream(),
2229 "Conflicting collector combinations in option list; "
2230 "please refer to the release notes for the combinations "
2231 "allowed\n");
2232 status = false;
2233 }
2234 return status;
2235 }
2236
2237 void Arguments::check_deprecated_gcs() {
2238 if (UseConcMarkSweepGC && !UseParNewGC) {
2239 warning("Using the DefNew young collector with the CMS collector is deprecated "
2240 "and will likely be removed in a future release");
2241 }
2242
2243 if (UseParNewGC && !UseConcMarkSweepGC) {
2244 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2245 // set up UseSerialGC properly, so that can't be used in the check here.
2246 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2247 "and will likely be removed in a future release");
2248 }
2249
2250 if (CMSIncrementalMode) {
2251 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2252 }
2253 }
2254
2255 void Arguments::check_deprecated_gc_flags() {
2256 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2257 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2258 "and will likely be removed in future release");
2259 }
2260 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2261 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2262 "Use MaxRAMFraction instead.");
2263 }
2264 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2265 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2266 }
2267 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2268 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2269 }
2270 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2271 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2272 }
2273 }
2274
2275 // Check stack pages settings
2276 bool Arguments::check_stack_pages()
2277 {
2278 bool status = true;
2279 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2280 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2281 // greater stack shadow pages can't generate instruction to bang stack
2282 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2283 return status;
2284 }
2285
2286 // Check the consistency of vm_init_args
2287 bool Arguments::check_vm_args_consistency() {
2288 // Method for adding checks for flag consistency.
2289 // The intent is to warn the user of all possible conflicts,
2290 // before returning an error.
2291 // Note: Needs platform-dependent factoring.
2292 bool status = true;
2293
2294 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2295 // builds so the cost of stack banging can be measured.
2296 #if (defined(PRODUCT) && defined(SOLARIS))
2297 if (!UseBoundThreads && !UseStackBanging) {
2298 jio_fprintf(defaultStream::error_stream(),
2299 "-UseStackBanging conflicts with -UseBoundThreads\n");
2300
2301 status = false;
2302 }
2303 #endif
2304
2305 if (TLABRefillWasteFraction == 0) {
2306 jio_fprintf(defaultStream::error_stream(),
2307 "TLABRefillWasteFraction should be a denominator, "
2308 "not " SIZE_FORMAT "\n",
2309 TLABRefillWasteFraction);
2310 status = false;
2311 }
2312
2313 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2314 "AdaptiveSizePolicyWeight");
2315 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2316
2317 // Divide by bucket size to prevent a large size from causing rollover when
2318 // calculating amount of memory needed to be allocated for the String table.
2319 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2320 (max_uintx / StringTable::bucket_size()), "StringTable size");
2321
2322 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2323 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2324
2325 {
2326 // Using "else if" below to avoid printing two error messages if min > max.
2327 // This will also prevent us from reporting both min>100 and max>100 at the
2328 // same time, but that is less annoying than printing two identical errors IMHO.
2329 FormatBuffer<80> err_msg("%s","");
2330 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2331 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2332 status = false;
2333 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2334 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2335 status = false;
2336 }
2337 }
2338
2339 // Min/MaxMetaspaceFreeRatio
2340 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2341 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2342
2343 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2344 jio_fprintf(defaultStream::error_stream(),
2345 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2346 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2347 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2348 MinMetaspaceFreeRatio,
2349 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2350 MaxMetaspaceFreeRatio);
2351 status = false;
2352 }
2353
2354 // Trying to keep 100% free is not practical
2355 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2356
2357 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2358 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2359 }
2360
2361 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2362 // Settings to encourage splitting.
2363 if (!FLAG_IS_CMDLINE(NewRatio)) {
2364 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2365 }
2366 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2367 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2368 }
2369 }
2370
2371 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2372 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2373 if (GCTimeLimit == 100) {
2374 // Turn off gc-overhead-limit-exceeded checks
2375 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2376 }
2377
2378 status = status && check_gc_consistency();
2379 status = status && check_stack_pages();
2380
2381 if (CMSIncrementalMode) {
2382 if (!UseConcMarkSweepGC) {
2383 jio_fprintf(defaultStream::error_stream(),
2384 "error: invalid argument combination.\n"
2385 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2386 "selected in order\nto use CMSIncrementalMode.\n");
2387 status = false;
2388 } else {
2389 status = status && verify_percentage(CMSIncrementalDutyCycle,
2390 "CMSIncrementalDutyCycle");
2391 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2392 "CMSIncrementalDutyCycleMin");
2393 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2394 "CMSIncrementalSafetyFactor");
2395 status = status && verify_percentage(CMSIncrementalOffset,
2396 "CMSIncrementalOffset");
2397 status = status && verify_percentage(CMSExpAvgFactor,
2398 "CMSExpAvgFactor");
2399 // If it was not set on the command line, set
2400 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2401 if (CMSInitiatingOccupancyFraction < 0) {
2402 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2403 }
2404 }
2405 }
2406
2407 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2408 // insists that we hold the requisite locks so that the iteration is
2409 // MT-safe. For the verification at start-up and shut-down, we don't
2410 // yet have a good way of acquiring and releasing these locks,
2411 // which are not visible at the CollectedHeap level. We want to
2412 // be able to acquire these locks and then do the iteration rather
2413 // than just disable the lock verification. This will be fixed under
2414 // bug 4788986.
2415 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2416 if (VerifyDuringStartup) {
2417 warning("Heap verification at start-up disabled "
2418 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2419 VerifyDuringStartup = false; // Disable verification at start-up
2420 }
2421
2422 if (VerifyBeforeExit) {
2423 warning("Heap verification at shutdown disabled "
2424 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2425 VerifyBeforeExit = false; // Disable verification at shutdown
2426 }
2427 }
2428
2429 // Note: only executed in non-PRODUCT mode
2430 if (!UseAsyncConcMarkSweepGC &&
2431 (ExplicitGCInvokesConcurrent ||
2432 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2433 jio_fprintf(defaultStream::error_stream(),
2434 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2435 " with -UseAsyncConcMarkSweepGC");
2436 status = false;
2437 }
2438
2439 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2440
2441 #if INCLUDE_ALL_GCS
2442 if (UseG1GC) {
2443 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2444 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2445 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2446
2447 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2448 "InitiatingHeapOccupancyPercent");
2449 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2450 "G1RefProcDrainInterval");
2451 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2452 "G1ConcMarkStepDurationMillis");
2453 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2454 "G1ConcRSHotCardLimit");
2455 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2456 "G1ConcRSLogCacheSize");
2457 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2458 "StringDeduplicationAgeThreshold");
2459 }
2460 if (UseConcMarkSweepGC) {
2461 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2462 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2463 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2464 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2465
2466 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2467
2468 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2469 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2470 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2471
2472 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2473
2474 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2475 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2476
2477 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2478 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2479 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2480
2481 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2482
2483 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2484
2485 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2486 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2487 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2488 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2489 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2490 }
2491
2492 if (UseParallelGC || UseParallelOldGC) {
2493 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2494 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2495
2496 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2497 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2498
2499 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2500 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2501
2502 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2503
2504 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2505 }
2506 #endif // INCLUDE_ALL_GCS
2507
2508 status = status && verify_interval(RefDiscoveryPolicy,
2509 ReferenceProcessor::DiscoveryPolicyMin,
2510 ReferenceProcessor::DiscoveryPolicyMax,
2511 "RefDiscoveryPolicy");
2512
2513 // Limit the lower bound of this flag to 1 as it is used in a division
2514 // expression.
2515 status = status && verify_interval(TLABWasteTargetPercent,
2516 1, 100, "TLABWasteTargetPercent");
2517
2518 status = status && verify_object_alignment();
2519
2520 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2521 "CompressedClassSpaceSize");
2522
2523 status = status && verify_interval(MarkStackSizeMax,
2524 1, (max_jint - 1), "MarkStackSizeMax");
2525 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2526
2527 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2528
2529 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2530
2531 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2532
2533 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2534 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2535
2536 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2537
2538 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2539 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2540 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2541 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2542
2543 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2544 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2545
2546 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2547 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2548 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2549
2550 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2551 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2552
2553 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2554 // just for that, so hardcode here.
2555 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2556 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2557 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2558 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2559
2560 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2561 #ifdef COMPILER1
2562 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2563 #endif
2564
2565 if (PrintNMTStatistics) {
2566 #if INCLUDE_NMT
2567 if (MemTracker::tracking_level() == NMT_off) {
2568 #endif // INCLUDE_NMT
2569 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2570 PrintNMTStatistics = false;
2571 #if INCLUDE_NMT
2572 }
2573 #endif
2574 }
2575
2576 // Need to limit the extent of the padding to reasonable size.
2577 // 8K is well beyond the reasonable HW cache line size, even with the
2578 // aggressive prefetching, while still leaving the room for segregating
2579 // among the distinct pages.
2580 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2581 jio_fprintf(defaultStream::error_stream(),
2582 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2583 ContendedPaddingWidth, 0, 8192);
2584 status = false;
2585 }
2586
2587 // Need to enforce the padding not to break the existing field alignments.
2588 // It is sufficient to check against the largest type size.
2589 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2590 jio_fprintf(defaultStream::error_stream(),
2591 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2592 ContendedPaddingWidth, BytesPerLong);
2593 status = false;
2594 }
2595
2596 // Check lower bounds of the code cache
2597 // Template Interpreter code is approximately 3X larger in debug builds.
2598 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2599 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2600 jio_fprintf(defaultStream::error_stream(),
2601 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2602 os::vm_page_size()/K);
2603 status = false;
2604 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2605 jio_fprintf(defaultStream::error_stream(),
2606 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2607 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2608 status = false;
2609 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2610 jio_fprintf(defaultStream::error_stream(),
2611 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2612 min_code_cache_size/K);
2613 status = false;
2614 } else if (ReservedCodeCacheSize > 2*G) {
2615 // Code cache size larger than MAXINT is not supported.
2616 jio_fprintf(defaultStream::error_stream(),
2617 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2618 (2*G)/M);
2619 status = false;
2620 }
2621
2622 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2623 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2624
2625 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2626 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2627 }
2628
2629 #ifdef COMPILER1
2630 status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
2631 #endif
2632
2633 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2634 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2635 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2636 // Check the minimum number of compiler threads
2637 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2638
2639 if ((FlightRecorder || StartFlightRecording != NULL) && !EnableJFR) {
2640 jio_fprintf(defaultStream::error_stream(),
2641 "The VM option -XX:+FlightRecorder or -XX:StartFlightRecording=... must be combined with -XX:+EnableJFR.\n");
2642 status = false;
2643 }
2644
2645 return status;
2646 }
2647
2648 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2649 const char* option_type) {
2650 if (ignore) return false;
2651
2652 const char* spacer = " ";
2653 if (option_type == NULL) {
2654 option_type = ++spacer; // Set both to the empty string.
2655 }
2656
2657 if (os::obsolete_option(option)) {
2658 jio_fprintf(defaultStream::error_stream(),
2659 "Obsolete %s%soption: %s\n", option_type, spacer,
2660 option->optionString);
2661 return false;
2662 } else {
2663 jio_fprintf(defaultStream::error_stream(),
2664 "Unrecognized %s%soption: %s\n", option_type, spacer,
2665 option->optionString);
2666 return true;
2667 }
2668 }
2669
2670 static const char* user_assertion_options[] = {
2671 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2672 };
2673
2674 static const char* system_assertion_options[] = {
2675 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2676 };
2677
2678 // Return true if any of the strings in null-terminated array 'names' matches.
2679 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2680 // the option must match exactly.
2681 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2682 bool tail_allowed) {
2683 for (/* empty */; *names != NULL; ++names) {
2684 if (match_option(option, *names, tail)) {
2685 if (**tail == '\0' || tail_allowed && **tail == ':') {
2686 return true;
2687 }
2688 }
2689 }
2690 return false;
2691 }
2692
2693 bool Arguments::parse_uintx(const char* value,
2694 uintx* uintx_arg,
2695 uintx min_size) {
2696
2697 // Check the sign first since atomull() parses only unsigned values.
2698 bool value_is_positive = !(*value == '-');
2699
2700 if (value_is_positive) {
2701 julong n;
2702 bool good_return = atomull(value, &n);
2703 if (good_return) {
2704 bool above_minimum = n >= min_size;
2705 bool value_is_too_large = n > max_uintx;
2706
2707 if (above_minimum && !value_is_too_large) {
2708 *uintx_arg = n;
2709 return true;
2710 }
2711 }
2712 }
2713 return false;
2714 }
2715
2716 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2717 julong* long_arg,
2718 julong min_size) {
2719 if (!atomull(s, long_arg)) return arg_unreadable;
2720 return check_memory_size(*long_arg, min_size);
2721 }
2722
2723 // Parse JavaVMInitArgs structure
2724
2725 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2726 // For components of the system classpath.
2727 SysClassPath scp(Arguments::get_sysclasspath());
2728 bool scp_assembly_required = false;
2729
2730 // Save default settings for some mode flags
2731 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2732 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2733 Arguments::_ClipInlining = ClipInlining;
2734 Arguments::_BackgroundCompilation = BackgroundCompilation;
2735
2736 // Setup flags for mixed which is the default
2737 set_mode_flags(_mixed);
2738
2739 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2740 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2741 if (result != JNI_OK) {
2742 return result;
2743 }
2744
2745 // Parse JavaVMInitArgs structure passed in
2746 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2747 if (result != JNI_OK) {
2748 return result;
2749 }
2750
2751 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2752 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2753 if (result != JNI_OK) {
2754 return result;
2755 }
2756
2757 // We need to ensure processor and memory resources have been properly
2758 // configured - which may rely on arguments we just processed - before
2759 // doing the final argument processing. Any argument processing that
2760 // needs to know about processor and memory resources must occur after
2761 // this point.
2762
2763 os::init_container_support();
2764
2765 // Do final processing now that all arguments have been parsed
2766 result = finalize_vm_init_args(&scp, scp_assembly_required);
2767 if (result != JNI_OK) {
2768 return result;
2769 }
2770
2771 return JNI_OK;
2772 }
2773
2774 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2775 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2776 // are dealing with -agentpath (case where name is a path), otherwise with
2777 // -agentlib
2778 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2779 char *_name;
2780 const char *_hprof = "hprof", *_jdwp = "jdwp";
2781 size_t _len_hprof, _len_jdwp, _len_prefix;
2782
2783 if (is_path) {
2784 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2785 return false;
2786 }
2787
2788 _name++; // skip past last path separator
2789 _len_prefix = strlen(JNI_LIB_PREFIX);
2790
2791 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2792 return false;
2793 }
2794
2795 _name += _len_prefix;
2796 _len_hprof = strlen(_hprof);
2797 _len_jdwp = strlen(_jdwp);
2798
2799 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2800 _name += _len_hprof;
2801 }
2802 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2803 _name += _len_jdwp;
2804 }
2805 else {
2806 return false;
2807 }
2808
2809 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2810 return false;
2811 }
2812
2813 return true;
2814 }
2815
2816 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2817 return true;
2818 }
2819
2820 return false;
2821 }
2822
2823 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2824 SysClassPath* scp_p,
2825 bool* scp_assembly_required_p,
2826 Flag::Flags origin) {
2827 // Remaining part of option string
2828 const char* tail;
2829
2830 // iterate over arguments
2831 for (int index = 0; index < args->nOptions; index++) {
2832 bool is_absolute_path = false; // for -agentpath vs -agentlib
2833
2834 const JavaVMOption* option = args->options + index;
2835
2836 if (!match_option(option, "-Djava.class.path", &tail) &&
2837 !match_option(option, "-Dsun.java.command", &tail) &&
2838 !match_option(option, "-Dsun.java.launcher", &tail)) {
2839
2840 // add all jvm options to the jvm_args string. This string
2841 // is used later to set the java.vm.args PerfData string constant.
2842 // the -Djava.class.path and the -Dsun.java.command options are
2843 // omitted from jvm_args string as each have their own PerfData
2844 // string constant object.
2845 build_jvm_args(option->optionString);
2846 }
2847
2848 // -verbose:[class/gc/jni]
2849 if (match_option(option, "-verbose", &tail)) {
2850 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2851 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2852 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2853 } else if (!strcmp(tail, ":gc")) {
2854 FLAG_SET_CMDLINE(bool, PrintGC, true);
2855 } else if (!strcmp(tail, ":jni")) {
2856 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2857 }
2858 // -da / -ea / -disableassertions / -enableassertions
2859 // These accept an optional class/package name separated by a colon, e.g.,
2860 // -da:java.lang.Thread.
2861 } else if (match_option(option, user_assertion_options, &tail, true)) {
2862 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2863 if (*tail == '\0') {
2864 JavaAssertions::setUserClassDefault(enable);
2865 } else {
2866 assert(*tail == ':', "bogus match by match_option()");
2867 JavaAssertions::addOption(tail + 1, enable);
2868 }
2869 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2870 } else if (match_option(option, system_assertion_options, &tail, false)) {
2871 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2872 JavaAssertions::setSystemClassDefault(enable);
2873 // -bootclasspath:
2874 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2875 scp_p->reset_path(tail);
2876 *scp_assembly_required_p = true;
2877 // -bootclasspath/a:
2878 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2879 scp_p->add_suffix(tail);
2880 *scp_assembly_required_p = true;
2881 // -bootclasspath/p:
2882 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2883 scp_p->add_prefix(tail);
2884 *scp_assembly_required_p = true;
2885 // -Xrun
2886 } else if (match_option(option, "-Xrun", &tail)) {
2887 if (tail != NULL) {
2888 const char* pos = strchr(tail, ':');
2889 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2890 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2891 name[len] = '\0';
2892
2893 char *options = NULL;
2894 if(pos != NULL) {
2895 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2896 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2897 }
2898 #if !INCLUDE_JVMTI
2899 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2900 jio_fprintf(defaultStream::error_stream(),
2901 "Profiling and debugging agents are not supported in this VM\n");
2902 return JNI_ERR;
2903 }
2904 #endif // !INCLUDE_JVMTI
2905 add_init_library(name, options);
2906 }
2907 // -agentlib and -agentpath
2908 } else if (match_option(option, "-agentlib:", &tail) ||
2909 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2910 if(tail != NULL) {
2911 const char* pos = strchr(tail, '=');
2912 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2913 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2914 name[len] = '\0';
2915
2916 char *options = NULL;
2917 if(pos != NULL) {
2918 size_t length = strlen(pos + 1) + 1;
2919 options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2920 jio_snprintf(options, length, "%s", pos + 1);
2921 }
2922 #if !INCLUDE_JVMTI
2923 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2924 jio_fprintf(defaultStream::error_stream(),
2925 "Profiling and debugging agents are not supported in this VM\n");
2926 return JNI_ERR;
2927 }
2928 #endif // !INCLUDE_JVMTI
2929 add_init_agent(name, options, is_absolute_path);
2930 }
2931 // -javaagent
2932 } else if (match_option(option, "-javaagent:", &tail)) {
2933 #if !INCLUDE_JVMTI
2934 jio_fprintf(defaultStream::error_stream(),
2935 "Instrumentation agents are not supported in this VM\n");
2936 return JNI_ERR;
2937 #else
2938 if(tail != NULL) {
2939 size_t length = strlen(tail) + 1;
2940 char *options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2941 jio_snprintf(options, length, "%s", tail);
2942 add_init_agent("instrument", options, false);
2943 }
2944 #endif // !INCLUDE_JVMTI
2945 // -Xnoclassgc
2946 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2947 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2948 // -Xincgc: i-CMS
2949 } else if (match_option(option, "-Xincgc", &tail)) {
2950 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2951 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2952 // -Xnoincgc: no i-CMS
2953 } else if (match_option(option, "-Xnoincgc", &tail)) {
2954 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2955 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2956 // -Xconcgc
2957 } else if (match_option(option, "-Xconcgc", &tail)) {
2958 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2959 // -Xnoconcgc
2960 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2961 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2962 // -Xbatch
2963 } else if (match_option(option, "-Xbatch", &tail)) {
2964 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2965 // -Xmn for compatibility with other JVM vendors
2966 } else if (match_option(option, "-Xmn", &tail)) {
2967 julong long_initial_young_size = 0;
2968 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2969 if (errcode != arg_in_range) {
2970 jio_fprintf(defaultStream::error_stream(),
2971 "Invalid initial young generation size: %s\n", option->optionString);
2972 describe_range_error(errcode);
2973 return JNI_EINVAL;
2974 }
2975 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2976 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2977 // -Xms
2978 } else if (match_option(option, "-Xms", &tail)) {
2979 julong long_initial_heap_size = 0;
2980 // an initial heap size of 0 means automatically determine
2981 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2982 if (errcode != arg_in_range) {
2983 jio_fprintf(defaultStream::error_stream(),
2984 "Invalid initial heap size: %s\n", option->optionString);
2985 describe_range_error(errcode);
2986 return JNI_EINVAL;
2987 }
2988 set_min_heap_size((uintx)long_initial_heap_size);
2989 // Currently the minimum size and the initial heap sizes are the same.
2990 // Can be overridden with -XX:InitialHeapSize.
2991 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2992 // -Xmx
2993 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2994 julong long_max_heap_size = 0;
2995 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2996 if (errcode != arg_in_range) {
2997 jio_fprintf(defaultStream::error_stream(),
2998 "Invalid maximum heap size: %s\n", option->optionString);
2999 describe_range_error(errcode);
3000 return JNI_EINVAL;
3001 }
3002 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
3003 // Xmaxf
3004 } else if (match_option(option, "-Xmaxf", &tail)) {
3005 char* err;
3006 int maxf = (int)(strtod(tail, &err) * 100);
3007 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
3008 jio_fprintf(defaultStream::error_stream(),
3009 "Bad max heap free percentage size: %s\n",
3010 option->optionString);
3011 return JNI_EINVAL;
3012 } else {
3013 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
3014 }
3015 // Xminf
3016 } else if (match_option(option, "-Xminf", &tail)) {
3017 char* err;
3018 int minf = (int)(strtod(tail, &err) * 100);
3019 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
3020 jio_fprintf(defaultStream::error_stream(),
3021 "Bad min heap free percentage size: %s\n",
3022 option->optionString);
3023 return JNI_EINVAL;
3024 } else {
3025 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
3026 }
3027 // -Xss
3028 } else if (match_option(option, "-Xss", &tail)) {
3029 julong long_ThreadStackSize = 0;
3030 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
3031 if (errcode != arg_in_range) {
3032 jio_fprintf(defaultStream::error_stream(),
3033 "Invalid thread stack size: %s\n", option->optionString);
3034 describe_range_error(errcode);
3035 return JNI_EINVAL;
3036 }
3037 // Internally track ThreadStackSize in units of 1024 bytes.
3038 FLAG_SET_CMDLINE(intx, ThreadStackSize,
3039 round_to((int)long_ThreadStackSize, K) / K);
3040 // -Xoss
3041 } else if (match_option(option, "-Xoss", &tail)) {
3042 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
3043 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3044 julong long_CodeCacheExpansionSize = 0;
3045 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3046 if (errcode != arg_in_range) {
3047 jio_fprintf(defaultStream::error_stream(),
3048 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3049 os::vm_page_size()/K);
3050 return JNI_EINVAL;
3051 }
3052 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
3053 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3054 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3055 julong long_ReservedCodeCacheSize = 0;
3056
3057 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3058 if (errcode != arg_in_range) {
3059 jio_fprintf(defaultStream::error_stream(),
3060 "Invalid maximum code cache size: %s.\n", option->optionString);
3061 return JNI_EINVAL;
3062 }
3063 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
3064 //-XX:IncreaseFirstTierCompileThresholdAt=
3065 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
3066 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
3067 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
3068 jio_fprintf(defaultStream::error_stream(),
3069 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
3070 option->optionString);
3071 return JNI_EINVAL;
3072 }
3073 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
3074 // -green
3075 } else if (match_option(option, "-green", &tail)) {
3076 jio_fprintf(defaultStream::error_stream(),
3077 "Green threads support not available\n");
3078 return JNI_EINVAL;
3079 // -native
3080 } else if (match_option(option, "-native", &tail)) {
3081 // HotSpot always uses native threads, ignore silently for compatibility
3082 // -Xsqnopause
3083 } else if (match_option(option, "-Xsqnopause", &tail)) {
3084 // EVM option, ignore silently for compatibility
3085 // -Xrs
3086 } else if (match_option(option, "-Xrs", &tail)) {
3087 // Classic/EVM option, new functionality
3088 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3089 } else if (match_option(option, "-Xusealtsigs", &tail)) {
3090 // change default internal VM signals used - lower case for back compat
3091 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3092 // -Xoptimize
3093 } else if (match_option(option, "-Xoptimize", &tail)) {
3094 // EVM option, ignore silently for compatibility
3095 // -Xprof
3096 } else if (match_option(option, "-Xprof", &tail)) {
3097 #if INCLUDE_FPROF
3098 _has_profile = true;
3099 #else // INCLUDE_FPROF
3100 jio_fprintf(defaultStream::error_stream(),
3101 "Flat profiling is not supported in this VM.\n");
3102 return JNI_ERR;
3103 #endif // INCLUDE_FPROF
3104 // -Xconcurrentio
3105 } else if (match_option(option, "-Xconcurrentio", &tail)) {
3106 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3107 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3108 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3109 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3110 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
3111
3112 // -Xinternalversion
3113 } else if (match_option(option, "-Xinternalversion", &tail)) {
3114 jio_fprintf(defaultStream::output_stream(), "%s\n",
3115 VM_Version::internal_vm_info_string());
3116 vm_exit(0);
3117 #ifndef PRODUCT
3118 // -Xprintflags
3119 } else if (match_option(option, "-Xprintflags", &tail)) {
3120 CommandLineFlags::printFlags(tty, false);
3121 vm_exit(0);
3122 #endif
3123 // -D
3124 } else if (match_option(option, "-D", &tail)) {
3125 if (CheckEndorsedAndExtDirs) {
3126 if (match_option(option, "-Djava.endorsed.dirs=", &tail)) {
3127 // abort if -Djava.endorsed.dirs is set
3128 jio_fprintf(defaultStream::output_stream(),
3129 "-Djava.endorsed.dirs will not be supported in a future release.\n"
3130 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3131 return JNI_EINVAL;
3132 }
3133 if (match_option(option, "-Djava.ext.dirs=", &tail)) {
3134 // abort if -Djava.ext.dirs is set
3135 jio_fprintf(defaultStream::output_stream(),
3136 "-Djava.ext.dirs will not be supported in a future release.\n"
3137 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3138 return JNI_EINVAL;
3139 }
3140 }
3141
3142 if (!add_property(tail)) {
3143 return JNI_ENOMEM;
3144 }
3145 // Out of the box management support
3146 if (match_option(option, "-Dcom.sun.management", &tail)) {
3147 #if INCLUDE_MANAGEMENT
3148 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3149 #else
3150 jio_fprintf(defaultStream::output_stream(),
3151 "-Dcom.sun.management is not supported in this VM.\n");
3152 return JNI_ERR;
3153 #endif
3154 }
3155 // -Xint
3156 } else if (match_option(option, "-Xint", &tail)) {
3157 set_mode_flags(_int);
3158 // -Xmixed
3159 } else if (match_option(option, "-Xmixed", &tail)) {
3160 set_mode_flags(_mixed);
3161 // -Xcomp
3162 } else if (match_option(option, "-Xcomp", &tail)) {
3163 // for testing the compiler; turn off all flags that inhibit compilation
3164 set_mode_flags(_comp);
3165 // -Xshare:dump
3166 } else if (match_option(option, "-Xshare:dump", &tail)) {
3167 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3168 set_mode_flags(_int); // Prevent compilation, which creates objects
3169 // -Xshare:on
3170 } else if (match_option(option, "-Xshare:on", &tail)) {
3171 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3172 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3173 // -Xshare:auto
3174 } else if (match_option(option, "-Xshare:auto", &tail)) {
3175 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3176 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3177 // -Xshare:off
3178 } else if (match_option(option, "-Xshare:off", &tail)) {
3179 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3180 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3181 // -Xverify
3182 } else if (match_option(option, "-Xverify", &tail)) {
3183 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3184 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3185 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3186 } else if (strcmp(tail, ":remote") == 0) {
3187 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3188 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3189 } else if (strcmp(tail, ":none") == 0) {
3190 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3191 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3192 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3193 return JNI_EINVAL;
3194 }
3195 // -Xdebug
3196 } else if (match_option(option, "-Xdebug", &tail)) {
3197 // note this flag has been used, then ignore
3198 set_xdebug_mode(true);
3199 // -Xnoagent
3200 } else if (match_option(option, "-Xnoagent", &tail)) {
3201 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3202 } else if (match_option(option, "-Xboundthreads", &tail)) {
3203 // Bind user level threads to kernel threads (Solaris only)
3204 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3205 } else if (match_option(option, "-Xloggc:", &tail)) {
3206 // Redirect GC output to the file. -Xloggc:<filename>
3207 // ostream_init_log(), when called will use this filename
3208 // to initialize a fileStream.
3209 _gc_log_filename = strdup(tail);
3210 if (!is_filename_valid(_gc_log_filename)) {
3211 jio_fprintf(defaultStream::output_stream(),
3212 "Invalid file name for use with -Xloggc: Filename can only contain the "
3213 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3214 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3215 return JNI_EINVAL;
3216 }
3217 FLAG_SET_CMDLINE(bool, PrintGC, true);
3218 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3219
3220 // JNI hooks
3221 } else if (match_option(option, "-Xcheck", &tail)) {
3222 if (!strcmp(tail, ":jni")) {
3223 #if !INCLUDE_JNI_CHECK
3224 warning("JNI CHECKING is not supported in this VM");
3225 #else
3226 CheckJNICalls = true;
3227 #endif // INCLUDE_JNI_CHECK
3228 } else if (is_bad_option(option, args->ignoreUnrecognized,
3229 "check")) {
3230 return JNI_EINVAL;
3231 }
3232 } else if (match_option(option, "vfprintf", &tail)) {
3233 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3234 } else if (match_option(option, "exit", &tail)) {
3235 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3236 } else if (match_option(option, "abort", &tail)) {
3237 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3238 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3239 // The last option must always win.
3240 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3241 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3242 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3243 // The last option must always win.
3244 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3245 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3246 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3247 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3248 jio_fprintf(defaultStream::error_stream(),
3249 "Please use CMSClassUnloadingEnabled in place of "
3250 "CMSPermGenSweepingEnabled in the future\n");
3251 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3252 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3253 jio_fprintf(defaultStream::error_stream(),
3254 "Please use -XX:+UseGCOverheadLimit in place of "
3255 "-XX:+UseGCTimeLimit in the future\n");
3256 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3257 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3258 jio_fprintf(defaultStream::error_stream(),
3259 "Please use -XX:-UseGCOverheadLimit in place of "
3260 "-XX:-UseGCTimeLimit in the future\n");
3261 // The TLE options are for compatibility with 1.3 and will be
3262 // removed without notice in a future release. These options
3263 // are not to be documented.
3264 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3265 // No longer used.
3266 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3267 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3268 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3269 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3270 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3271 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3272 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3273 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3274 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3275 // No longer used.
3276 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3277 julong long_tlab_size = 0;
3278 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3279 if (errcode != arg_in_range) {
3280 jio_fprintf(defaultStream::error_stream(),
3281 "Invalid TLAB size: %s\n", option->optionString);
3282 describe_range_error(errcode);
3283 return JNI_EINVAL;
3284 }
3285 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3286 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3287 // No longer used.
3288 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3289 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3290 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3291 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3292 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3293 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3294 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3295 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3296 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3297 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3298 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3299 #if defined(DTRACE_ENABLED)
3300 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3301 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3302 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3303 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3304 #else // defined(DTRACE_ENABLED)
3305 jio_fprintf(defaultStream::error_stream(),
3306 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3307 return JNI_EINVAL;
3308 #endif // defined(DTRACE_ENABLED)
3309 #ifdef ASSERT
3310 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3311 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3312 // disable scavenge before parallel mark-compact
3313 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3314 #endif
3315 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3316 julong cms_blocks_to_claim = (julong)atol(tail);
3317 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3318 jio_fprintf(defaultStream::error_stream(),
3319 "Please use -XX:OldPLABSize in place of "
3320 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3321 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3322 julong cms_blocks_to_claim = (julong)atol(tail);
3323 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3324 jio_fprintf(defaultStream::error_stream(),
3325 "Please use -XX:OldPLABSize in place of "
3326 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3327 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3328 julong old_plab_size = 0;
3329 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3330 if (errcode != arg_in_range) {
3331 jio_fprintf(defaultStream::error_stream(),
3332 "Invalid old PLAB size: %s\n", option->optionString);
3333 describe_range_error(errcode);
3334 return JNI_EINVAL;
3335 }
3336 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3337 jio_fprintf(defaultStream::error_stream(),
3338 "Please use -XX:OldPLABSize in place of "
3339 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3340 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3341 julong young_plab_size = 0;
3342 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3343 if (errcode != arg_in_range) {
3344 jio_fprintf(defaultStream::error_stream(),
3345 "Invalid young PLAB size: %s\n", option->optionString);
3346 describe_range_error(errcode);
3347 return JNI_EINVAL;
3348 }
3349 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3350 jio_fprintf(defaultStream::error_stream(),
3351 "Please use -XX:YoungPLABSize in place of "
3352 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3353 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3354 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3355 julong stack_size = 0;
3356 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3357 if (errcode != arg_in_range) {
3358 jio_fprintf(defaultStream::error_stream(),
3359 "Invalid mark stack size: %s\n", option->optionString);
3360 describe_range_error(errcode);
3361 return JNI_EINVAL;
3362 }
3363 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3364 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3365 julong max_stack_size = 0;
3366 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3367 if (errcode != arg_in_range) {
3368 jio_fprintf(defaultStream::error_stream(),
3369 "Invalid maximum mark stack size: %s\n",
3370 option->optionString);
3371 describe_range_error(errcode);
3372 return JNI_EINVAL;
3373 }
3374 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3375 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3376 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3377 uintx conc_threads = 0;
3378 if (!parse_uintx(tail, &conc_threads, 1)) {
3379 jio_fprintf(defaultStream::error_stream(),
3380 "Invalid concurrent threads: %s\n", option->optionString);
3381 return JNI_EINVAL;
3382 }
3383 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3384 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3385 julong max_direct_memory_size = 0;
3386 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3387 if (errcode != arg_in_range) {
3388 jio_fprintf(defaultStream::error_stream(),
3389 "Invalid maximum direct memory size: %s\n",
3390 option->optionString);
3391 describe_range_error(errcode);
3392 return JNI_EINVAL;
3393 }
3394 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3395 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3396 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3397 // away and will cause VM initialization failures!
3398 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3399 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3400 #if !INCLUDE_MANAGEMENT
3401 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3402 jio_fprintf(defaultStream::error_stream(),
3403 "ManagementServer is not supported in this VM.\n");
3404 return JNI_ERR;
3405 #endif // INCLUDE_MANAGEMENT
3406 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3407 // Skip -XX:Flags= since that case has already been handled
3408 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3409 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3410 return JNI_EINVAL;
3411 }
3412 }
3413 // Unknown option
3414 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3415 return JNI_ERR;
3416 }
3417 }
3418
3419 // PrintSharedArchiveAndExit will turn on
3420 // -Xshare:on
3421 // -XX:+TraceClassPaths
3422 if (PrintSharedArchiveAndExit) {
3423 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3424 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3425 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3426 }
3427
3428 // Change the default value for flags which have different default values
3429 // when working with older JDKs.
3430 #ifdef LINUX
3431 if (JDK_Version::current().compare_major(6) <= 0 &&
3432 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3433 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3434 }
3435 #endif // LINUX
3436 fix_appclasspath();
3437 return JNI_OK;
3438 }
3439
3440 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3441 //
3442 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3443 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3444 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3445 // path is treated as the current directory.
3446 //
3447 // This causes problems with CDS, which requires that all directories specified in the classpath
3448 // must be empty. In most cases, applications do NOT want to load classes from the current
3449 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3450 // scripts compatible with CDS.
3451 void Arguments::fix_appclasspath() {
3452 if (IgnoreEmptyClassPaths) {
3453 const char separator = *os::path_separator();
3454 const char* src = _java_class_path->value();
3455
3456 // skip over all the leading empty paths
3457 while (*src == separator) {
3458 src ++;
3459 }
3460
3461 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3462 strncpy(copy, src, strlen(src) + 1);
3463
3464 // trim all trailing empty paths
3465 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3466 *tail = '\0';
3467 }
3468
3469 char from[3] = {separator, separator, '\0'};
3470 char to [2] = {separator, '\0'};
3471 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3472 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3473 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3474 }
3475
3476 _java_class_path->set_value(copy);
3477 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3478 }
3479
3480 if (!PrintSharedArchiveAndExit) {
3481 ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
3482 }
3483 }
3484
3485 static bool has_jar_files(const char* directory) {
3486 DIR* dir = os::opendir(directory);
3487 if (dir == NULL) return false;
3488
3489 struct dirent *entry;
3490 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3491 bool hasJarFile = false;
3492 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3493 const char* name = entry->d_name;
3494 const char* ext = name + strlen(name) - 4;
3495 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3496 }
3497 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
3498 os::closedir(dir);
3499 return hasJarFile ;
3500 }
3501
3502 // returns the number of directories in the given path containing JAR files
3503 // If the skip argument is not NULL, it will skip that directory
3504 static int check_non_empty_dirs(const char* path, const char* type, const char* skip) {
3505 const char separator = *os::path_separator();
3506 const char* const end = path + strlen(path);
3507 int nonEmptyDirs = 0;
3508 while (path < end) {
3509 const char* tmp_end = strchr(path, separator);
3510 if (tmp_end == NULL) {
3511 if ((skip == NULL || strcmp(path, skip) != 0) && has_jar_files(path)) {
3512 nonEmptyDirs++;
3513 jio_fprintf(defaultStream::output_stream(),
3514 "Non-empty %s directory: %s\n", type, path);
3515 }
3516 path = end;
3517 } else {
3518 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3519 memcpy(dirpath, path, tmp_end - path);
3520 dirpath[tmp_end - path] = '\0';
3521 if ((skip == NULL || strcmp(dirpath, skip) != 0) && has_jar_files(dirpath)) {
3522 nonEmptyDirs++;
3523 jio_fprintf(defaultStream::output_stream(),
3524 "Non-empty %s directory: %s\n", type, dirpath);
3525 }
3526 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
3527 path = tmp_end + 1;
3528 }
3529 }
3530 return nonEmptyDirs;
3531 }
3532
3533 // Returns true if endorsed standards override mechanism and extension mechanism
3534 // are not used.
3535 static bool check_endorsed_and_ext_dirs() {
3536 if (!CheckEndorsedAndExtDirs)
3537 return true;
3538
3539 char endorsedDir[JVM_MAXPATHLEN];
3540 char extDir[JVM_MAXPATHLEN];
3541 const char* fileSep = os::file_separator();
3542 jio_snprintf(endorsedDir, sizeof(endorsedDir), "%s%slib%sendorsed",
3543 Arguments::get_java_home(), fileSep, fileSep);
3544 jio_snprintf(extDir, sizeof(extDir), "%s%slib%sext",
3545 Arguments::get_java_home(), fileSep, fileSep);
3546
3547 // check endorsed directory
3548 int nonEmptyDirs = check_non_empty_dirs(Arguments::get_endorsed_dir(), "endorsed", NULL);
3549
3550 // check the extension directories but skip the default lib/ext directory
3551 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs(), "extension", extDir);
3552
3553 // List of JAR files installed in the default lib/ext directory.
3554 // -XX:+CheckEndorsedAndExtDirs checks if any non-JDK file installed
3555 static const char* jdk_ext_jars[] = {
3556 "access-bridge-32.jar",
3557 "access-bridge-64.jar",
3558 "access-bridge.jar",
3559 "cldrdata.jar",
3560 "dnsns.jar",
3561 "jaccess.jar",
3562 "jfxrt.jar",
3563 "localedata.jar",
3564 "nashorn.jar",
3565 "sunec.jar",
3566 "sunjce_provider.jar",
3567 "sunmscapi.jar",
3568 "sunpkcs11.jar",
3569 "ucrypto.jar",
3570 "zipfs.jar",
3571 NULL
3572 };
3573
3574 // check if the default lib/ext directory has any non-JDK jar files; if so, error
3575 DIR* dir = os::opendir(extDir);
3576 if (dir != NULL) {
3577 int num_ext_jars = 0;
3578 struct dirent *entry;
3579 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(extDir), mtInternal);
3580 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3581 const char* name = entry->d_name;
3582 const char* ext = name + strlen(name) - 4;
3583 if (ext > name && (os::file_name_strcmp(ext, ".jar") == 0)) {
3584 bool is_jdk_jar = false;
3585 const char* jarfile = NULL;
3586 for (int i=0; (jarfile = jdk_ext_jars[i]) != NULL; i++) {
3587 if (os::file_name_strcmp(name, jarfile) == 0) {
3588 is_jdk_jar = true;
3589 break;
3590 }
3591 }
3592 if (!is_jdk_jar) {
3593 jio_fprintf(defaultStream::output_stream(),
3594 "%s installed in <JAVA_HOME>/lib/ext\n", name);
3595 num_ext_jars++;
3596 }
3597 }
3598 }
3599 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
3600 os::closedir(dir);
3601 if (num_ext_jars > 0) {
3602 nonEmptyDirs += 1;
3603 }
3604 }
3605
3606 // check if the default lib/endorsed directory exists; if so, error
3607 dir = os::opendir(endorsedDir);
3608 if (dir != NULL) {
3609 jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed exists\n");
3610 os::closedir(dir);
3611 nonEmptyDirs += 1;
3612 }
3613
3614 if (nonEmptyDirs > 0) {
3615 jio_fprintf(defaultStream::output_stream(),
3616 "Endorsed standards override mechanism and extension mechanism "
3617 "will not be supported in a future release.\n"
3618 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3619 return false;
3620 }
3621
3622 return true;
3623 }
3624
3625 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3626 // This must be done after all -D arguments have been processed.
3627 scp_p->expand_endorsed();
3628
3629 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3630 // Assemble the bootclasspath elements into the final path.
3631 Arguments::set_sysclasspath(scp_p->combined_path());
3632 }
3633
3634 if (!check_endorsed_and_ext_dirs()) {
3635 return JNI_ERR;
3636 }
3637
3638 // This must be done after all arguments have been processed
3639 // and the container support has been initialized since AggressiveHeap
3640 // relies on the amount of total memory available.
3641 if (AggressiveHeap) {
3642 jint result = set_aggressive_heap_flags();
3643 if (result != JNI_OK) {
3644 return result;
3645 }
3646 }
3647 // This must be done after all arguments have been processed.
3648 // java_compiler() true means set to "NONE" or empty.
3649 if (java_compiler() && !xdebug_mode()) {
3650 // For backwards compatibility, we switch to interpreted mode if
3651 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3652 // not specified.
3653 set_mode_flags(_int);
3654 }
3655 if (CompileThreshold == 0) {
3656 set_mode_flags(_int);
3657 }
3658
3659 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3660 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3661 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3662 }
3663
3664 #ifndef COMPILER2
3665 // Don't degrade server performance for footprint
3666 if (FLAG_IS_DEFAULT(UseLargePages) &&
3667 MaxHeapSize < LargePageHeapSizeThreshold) {
3668 // No need for large granularity pages w/small heaps.
3669 // Note that large pages are enabled/disabled for both the
3670 // Java heap and the code cache.
3671 FLAG_SET_DEFAULT(UseLargePages, false);
3672 }
3673
3674 #else
3675 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3676 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3677 }
3678 #endif
3679
3680 #ifndef TIERED
3681 // Tiered compilation is undefined.
3682 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3683 #endif
3684
3685 // If we are running in a headless jre, force java.awt.headless property
3686 // to be true unless the property has already been set.
3687 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3688 if (os::is_headless_jre()) {
3689 const char* headless = Arguments::get_property("java.awt.headless");
3690 if (headless == NULL) {
3691 char envbuffer[128];
3692 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3693 if (!add_property("java.awt.headless=true")) {
3694 return JNI_ENOMEM;
3695 }
3696 } else {
3697 char buffer[256];
3698 jio_snprintf(buffer, 256, "java.awt.headless=%s", envbuffer);
3699 if (!add_property(buffer)) {
3700 return JNI_ENOMEM;
3701 }
3702 }
3703 }
3704 }
3705
3706 if (!check_vm_args_consistency()) {
3707 return JNI_ERR;
3708 }
3709
3710 return JNI_OK;
3711 }
3712
3713 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3714 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3715 scp_assembly_required_p);
3716 }
3717
3718 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3719 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3720 scp_assembly_required_p);
3721 }
3722
3723 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3724 const int N_MAX_OPTIONS = 64;
3725 const int OPTION_BUFFER_SIZE = 1024;
3726 char buffer[OPTION_BUFFER_SIZE];
3727
3728 // The variable will be ignored if it exceeds the length of the buffer.
3729 // Don't check this variable if user has special privileges
3730 // (e.g. unix su command).
3731 if (os::getenv(name, buffer, sizeof(buffer)) &&
3732 !os::have_special_privileges()) {
3733 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3734 jio_fprintf(defaultStream::error_stream(),
3735 "Picked up %s: %s\n", name, buffer);
3736 char* rd = buffer; // pointer to the input string (rd)
3737 int i;
3738 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3739 while (isspace(*rd)) rd++; // skip whitespace
3740 if (*rd == 0) break; // we re done when the input string is read completely
3741
3742 // The output, option string, overwrites the input string.
3743 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3744 // input string (rd).
3745 char* wrt = rd;
3746
3747 options[i++].optionString = wrt; // Fill in option
3748 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3749 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3750 int quote = *rd; // matching quote to look for
3751 rd++; // don't copy open quote
3752 while (*rd != quote) { // include everything (even spaces) up until quote
3753 if (*rd == 0) { // string termination means unmatched string
3754 jio_fprintf(defaultStream::error_stream(),
3755 "Unmatched quote in %s\n", name);
3756 return JNI_ERR;
3757 }
3758 *wrt++ = *rd++; // copy to option string
3759 }
3760 rd++; // don't copy close quote
3761 } else {
3762 *wrt++ = *rd++; // copy to option string
3763 }
3764 }
3765 // Need to check if we're done before writing a NULL,
3766 // because the write could be to the byte that rd is pointing to.
3767 if (*rd++ == 0) {
3768 *wrt = 0;
3769 break;
3770 }
3771 *wrt = 0; // Zero terminate option
3772 }
3773 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3774 JavaVMInitArgs vm_args;
3775 vm_args.version = JNI_VERSION_1_2;
3776 vm_args.options = options;
3777 vm_args.nOptions = i;
3778 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3779
3780 if (PrintVMOptions) {
3781 const char* tail;
3782 for (int i = 0; i < vm_args.nOptions; i++) {
3783 const JavaVMOption *option = vm_args.options + i;
3784 if (match_option(option, "-XX:", &tail)) {
3785 logOption(tail);
3786 }
3787 }
3788 }
3789
3790 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3791 }
3792 return JNI_OK;
3793 }
3794
3795 void Arguments::set_shared_spaces_flags() {
3796 if (DumpSharedSpaces) {
3797 if (FailOverToOldVerifier) {
3798 // Don't fall back to the old verifier on verification failure. If a
3799 // class fails verification with the split verifier, it might fail the
3800 // CDS runtime verifier constraint check. In that case, we don't want
3801 // to share the class. We only archive classes that pass the split verifier.
3802 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3803 }
3804
3805 if (RequireSharedSpaces) {
3806 warning("cannot dump shared archive while using shared archive");
3807 }
3808 UseSharedSpaces = false;
3809 #ifdef _LP64
3810 if (!UseCompressedOops || !UseCompressedClassPointers) {
3811 vm_exit_during_initialization(
3812 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3813 }
3814 } else {
3815 if (!UseCompressedOops || !UseCompressedClassPointers) {
3816 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3817 }
3818 #endif
3819 }
3820 }
3821
3822 #if !INCLUDE_ALL_GCS
3823 static void force_serial_gc() {
3824 FLAG_SET_DEFAULT(UseSerialGC, true);
3825 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3826 UNSUPPORTED_GC_OPTION(UseG1GC);
3827 UNSUPPORTED_GC_OPTION(UseParallelGC);
3828 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3829 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3830 UNSUPPORTED_GC_OPTION(UseParNewGC);
3831 }
3832 #endif // INCLUDE_ALL_GCS
3833
3834 // Sharing support
3835 // Construct the path to the archive
3836 static char* get_shared_archive_path() {
3837 char *shared_archive_path;
3838 if (SharedArchiveFile == NULL) {
3839 char jvm_path[JVM_MAXPATHLEN];
3840 os::jvm_path(jvm_path, sizeof(jvm_path));
3841 char *end = strrchr(jvm_path, *os::file_separator());
3842 if (end != NULL) *end = '\0';
3843 size_t jvm_path_len = strlen(jvm_path);
3844 size_t file_sep_len = strlen(os::file_separator());
3845 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3846 file_sep_len + 20, mtInternal);
3847 if (shared_archive_path != NULL) {
3848 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3849 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3850 strncat(shared_archive_path, "classes.jsa", 11);
3851 }
3852 } else {
3853 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3854 if (shared_archive_path != NULL) {
3855 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3856 }
3857 }
3858 return shared_archive_path;
3859 }
3860
3861 #ifndef PRODUCT
3862 // Determine whether LogVMOutput should be implicitly turned on.
3863 static bool use_vm_log() {
3864 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3865 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3866 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3867 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3868 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3869 return true;
3870 }
3871
3872 #ifdef COMPILER1
3873 if (PrintC1Statistics) {
3874 return true;
3875 }
3876 #endif // COMPILER1
3877
3878 #ifdef COMPILER2
3879 if (PrintOptoAssembly || PrintOptoStatistics) {
3880 return true;
3881 }
3882 #endif // COMPILER2
3883
3884 return false;
3885 }
3886 #endif // PRODUCT
3887
3888 // Parse entry point called from JNI_CreateJavaVM
3889
3890 jint Arguments::parse(const JavaVMInitArgs* args) {
3891
3892 // Remaining part of option string
3893 const char* tail;
3894
3895 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3896 const char* hotspotrc = ".hotspotrc";
3897 bool settings_file_specified = false;
3898 bool needs_hotspotrc_warning = false;
3899
3900 ArgumentsExt::process_options(args);
3901
3902 const char* flags_file;
3903 int index;
3904 for (index = 0; index < args->nOptions; index++) {
3905 const JavaVMOption *option = args->options + index;
3906 if (match_option(option, "-XX:Flags=", &tail)) {
3907 flags_file = tail;
3908 settings_file_specified = true;
3909 }
3910 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3911 PrintVMOptions = true;
3912 }
3913 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3914 PrintVMOptions = false;
3915 }
3916 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3917 IgnoreUnrecognizedVMOptions = true;
3918 }
3919 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3920 IgnoreUnrecognizedVMOptions = false;
3921 }
3922 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3923 CommandLineFlags::printFlags(tty, false);
3924 vm_exit(0);
3925 }
3926 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3927 #if INCLUDE_NMT
3928 // The launcher did not setup nmt environment variable properly.
3929 if (!MemTracker::check_launcher_nmt_support(tail)) {
3930 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3931 }
3932
3933 // Verify if nmt option is valid.
3934 if (MemTracker::verify_nmt_option()) {
3935 // Late initialization, still in single-threaded mode.
3936 if (MemTracker::tracking_level() >= NMT_summary) {
3937 MemTracker::init();
3938 }
3939 } else {
3940 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3941 }
3942 #else
3943 jio_fprintf(defaultStream::error_stream(),
3944 "Native Memory Tracking is not supported in this VM\n");
3945 return JNI_ERR;
3946 #endif
3947 }
3948
3949
3950 #ifndef PRODUCT
3951 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3952 CommandLineFlags::printFlags(tty, true);
3953 vm_exit(0);
3954 }
3955 #endif
3956 }
3957
3958 if (IgnoreUnrecognizedVMOptions) {
3959 // uncast const to modify the flag args->ignoreUnrecognized
3960 *(jboolean*)(&args->ignoreUnrecognized) = true;
3961 }
3962
3963 // Parse specified settings file
3964 if (settings_file_specified) {
3965 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3966 return JNI_EINVAL;
3967 }
3968 } else {
3969 #ifdef ASSERT
3970 // Parse default .hotspotrc settings file
3971 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3972 return JNI_EINVAL;
3973 }
3974 #else
3975 struct stat buf;
3976 if (os::stat(hotspotrc, &buf) == 0) {
3977 needs_hotspotrc_warning = true;
3978 }
3979 #endif
3980 }
3981
3982 if (PrintVMOptions) {
3983 for (index = 0; index < args->nOptions; index++) {
3984 const JavaVMOption *option = args->options + index;
3985 if (match_option(option, "-XX:", &tail)) {
3986 logOption(tail);
3987 }
3988 }
3989 }
3990
3991 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3992 jint result = parse_vm_init_args(args);
3993 if (result != JNI_OK) {
3994 return result;
3995 }
3996
3997 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3998 SharedArchivePath = get_shared_archive_path();
3999 if (SharedArchivePath == NULL) {
4000 return JNI_ENOMEM;
4001 }
4002
4003 // Set up VerifySharedSpaces
4004 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4005 VerifySharedSpaces = true;
4006 }
4007
4008 // Delay warning until here so that we've had a chance to process
4009 // the -XX:-PrintWarnings flag
4010 if (needs_hotspotrc_warning) {
4011 warning("%s file is present but has been ignored. "
4012 "Run with -XX:Flags=%s to load the file.",
4013 hotspotrc, hotspotrc);
4014 }
4015
4016 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
4017 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4018 #endif
4019
4020 #if INCLUDE_ALL_GCS
4021 #if (defined JAVASE_EMBEDDED || defined ARM)
4022 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
4023 #endif
4024 #endif
4025
4026 #ifndef PRODUCT
4027 if (TraceBytecodesAt != 0) {
4028 TraceBytecodes = true;
4029 }
4030 if (CountCompiledCalls) {
4031 if (UseCounterDecay) {
4032 warning("UseCounterDecay disabled because CountCalls is set");
4033 UseCounterDecay = false;
4034 }
4035 }
4036 #endif // PRODUCT
4037
4038 // JSR 292 is not supported before 1.7
4039 if (!JDK_Version::is_gte_jdk17x_version()) {
4040 if (EnableInvokeDynamic) {
4041 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
4042 warning("JSR 292 is not supported before 1.7. Disabling support.");
4043 }
4044 EnableInvokeDynamic = false;
4045 }
4046 }
4047
4048 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
4049 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4050 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
4051 }
4052 ScavengeRootsInCode = 1;
4053 }
4054
4055 if (PrintGCDetails) {
4056 // Turn on -verbose:gc options as well
4057 PrintGC = true;
4058 }
4059
4060 if (!JDK_Version::is_gte_jdk18x_version()) {
4061 // To avoid changing the log format for 7 updates this flag is only
4062 // true by default in JDK8 and above.
4063 if (FLAG_IS_DEFAULT(PrintGCCause)) {
4064 FLAG_SET_DEFAULT(PrintGCCause, false);
4065 }
4066 }
4067
4068 // Set object alignment values.
4069 set_object_alignment();
4070
4071 #if !INCLUDE_ALL_GCS
4072 force_serial_gc();
4073 #endif // INCLUDE_ALL_GCS
4074 #if !INCLUDE_CDS
4075 if (DumpSharedSpaces || RequireSharedSpaces) {
4076 jio_fprintf(defaultStream::error_stream(),
4077 "Shared spaces are not supported in this VM\n");
4078 return JNI_ERR;
4079 }
4080 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4081 warning("Shared spaces are not supported in this VM");
4082 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4083 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4084 }
4085 no_shared_spaces("CDS Disabled");
4086 #endif // INCLUDE_CDS
4087
4088 return JNI_OK;
4089 }
4090
4091 jint Arguments::apply_ergo() {
4092
4093 // Set flags based on ergonomics.
4094 set_ergonomics_flags();
4095
4096 set_shared_spaces_flags();
4097
4098 #if defined(SPARC)
4099 // BIS instructions require 'membar' instruction regardless of the number
4100 // of CPUs because in virtualized/container environments which might use only 1
4101 // CPU, BIS instructions may produce incorrect results.
4102
4103 if (FLAG_IS_DEFAULT(AssumeMP)) {
4104 FLAG_SET_DEFAULT(AssumeMP, true);
4105 }
4106 #endif
4107
4108 // Check the GC selections again.
4109 if (!check_gc_consistency()) {
4110 return JNI_EINVAL;
4111 }
4112
4113 if (TieredCompilation) {
4114 set_tiered_flags();
4115 } else {
4116 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
4117 if (CompilationPolicyChoice >= 2) {
4118 vm_exit_during_initialization(
4119 "Incompatible compilation policy selected", NULL);
4120 }
4121 }
4122 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
4123 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4124 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
4125 }
4126
4127
4128 // Set heap size based on available physical memory
4129 set_heap_size();
4130
4131 ArgumentsExt::set_gc_specific_flags();
4132
4133 // Initialize Metaspace flags and alignments.
4134 Metaspace::ergo_initialize();
4135
4136 // Set bytecode rewriting flags
4137 set_bytecode_flags();
4138
4139 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
4140 set_aggressive_opts_flags();
4141
4142 // Turn off biased locking for locking debug mode flags,
4143 // which are subtlely different from each other but neither works with
4144 // biased locking.
4145 if (UseHeavyMonitors
4146 #ifdef COMPILER1
4147 || !UseFastLocking
4148 #endif // COMPILER1
4149 ) {
4150 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4151 // flag set to true on command line; warn the user that they
4152 // can't enable biased locking here
4153 warning("Biased Locking is not supported with locking debug flags"
4154 "; ignoring UseBiasedLocking flag." );
4155 }
4156 UseBiasedLocking = false;
4157 }
4158
4159 #ifdef ZERO
4160 // Clear flags not supported on zero.
4161 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4162 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4163 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4164 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4165 #endif // CC_INTERP
4166
4167 #ifdef COMPILER2
4168 if (!EliminateLocks) {
4169 EliminateNestedLocks = false;
4170 }
4171 if (!Inline) {
4172 IncrementalInline = false;
4173 }
4174 #ifndef PRODUCT
4175 if (!IncrementalInline) {
4176 AlwaysIncrementalInline = false;
4177 }
4178 #endif
4179 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
4180 // incremental inlining: bump MaxNodeLimit
4181 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
4182 }
4183 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4184 // nothing to use the profiling, turn if off
4185 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4186 }
4187 #endif
4188
4189 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4190 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4191 DebugNonSafepoints = true;
4192 }
4193
4194 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4195 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4196 }
4197
4198 if (UseOnStackReplacement && !UseLoopCounter) {
4199 warning("On-stack-replacement requires loop counters; enabling loop counters");
4200 FLAG_SET_DEFAULT(UseLoopCounter, true);
4201 }
4202
4203 #ifndef PRODUCT
4204 if (CompileTheWorld) {
4205 // Force NmethodSweeper to sweep whole CodeCache each time.
4206 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4207 NmethodSweepFraction = 1;
4208 }
4209 }
4210
4211 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4212 if (use_vm_log()) {
4213 LogVMOutput = true;
4214 }
4215 }
4216 #endif // PRODUCT
4217
4218 if (PrintCommandLineFlags) {
4219 CommandLineFlags::printSetFlags(tty);
4220 }
4221
4222 // Apply CPU specific policy for the BiasedLocking
4223 if (UseBiasedLocking) {
4224 if (!VM_Version::use_biased_locking() &&
4225 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4226 UseBiasedLocking = false;
4227 }
4228 }
4229 #ifdef COMPILER2
4230 if (!UseBiasedLocking || EmitSync != 0) {
4231 UseOptoBiasInlining = false;
4232 }
4233 #endif
4234
4235 // set PauseAtExit if the gamma launcher was used and a debugger is attached
4236 // but only if not already set on the commandline
4237 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
4238 bool set = false;
4239 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
4240 if (!set) {
4241 FLAG_SET_DEFAULT(PauseAtExit, true);
4242 }
4243 }
4244
4245 return JNI_OK;
4246 }
4247
4248 jint Arguments::adjust_after_os() {
4249 if (UseNUMA) {
4250 if (UseParallelGC || UseParallelOldGC) {
4251 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4252 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4253 }
4254 }
4255 // UseNUMAInterleaving is set to ON for all collectors and
4256 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4257 // such as the parallel collector for Linux and Solaris will
4258 // interleave old gen and survivor spaces on top of NUMA
4259 // allocation policy for the eden space.
4260 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4261 // all platforms and ParallelGC on Windows will interleave all
4262 // of the heap spaces across NUMA nodes.
4263 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4264 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4265 }
4266 }
4267 return JNI_OK;
4268 }
4269
4270 int Arguments::PropertyList_count(SystemProperty* pl) {
4271 int count = 0;
4272 while(pl != NULL) {
4273 count++;
4274 pl = pl->next();
4275 }
4276 return count;
4277 }
4278
4279 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4280 assert(key != NULL, "just checking");
4281 SystemProperty* prop;
4282 for (prop = pl; prop != NULL; prop = prop->next()) {
4283 if (strcmp(key, prop->key()) == 0) return prop->value();
4284 }
4285 return NULL;
4286 }
4287
4288 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4289 int count = 0;
4290 const char* ret_val = NULL;
4291
4292 while(pl != NULL) {
4293 if(count >= index) {
4294 ret_val = pl->key();
4295 break;
4296 }
4297 count++;
4298 pl = pl->next();
4299 }
4300
4301 return ret_val;
4302 }
4303
4304 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4305 int count = 0;
4306 char* ret_val = NULL;
4307
4308 while(pl != NULL) {
4309 if(count >= index) {
4310 ret_val = pl->value();
4311 break;
4312 }
4313 count++;
4314 pl = pl->next();
4315 }
4316
4317 return ret_val;
4318 }
4319
4320 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4321 SystemProperty* p = *plist;
4322 if (p == NULL) {
4323 *plist = new_p;
4324 } else {
4325 while (p->next() != NULL) {
4326 p = p->next();
4327 }
4328 p->set_next(new_p);
4329 }
4330 }
4331
4332 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4333 if (plist == NULL)
4334 return;
4335
4336 SystemProperty* new_p = new SystemProperty(k, v, true);
4337 PropertyList_add(plist, new_p);
4338 }
4339
4340 // This add maintains unique property key in the list.
4341 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4342 if (plist == NULL)
4343 return;
4344
4345 // If property key exist then update with new value.
4346 SystemProperty* prop;
4347 for (prop = *plist; prop != NULL; prop = prop->next()) {
4348 if (strcmp(k, prop->key()) == 0) {
4349 if (append) {
4350 prop->append_value(v);
4351 } else {
4352 prop->set_value(v);
4353 }
4354 return;
4355 }
4356 }
4357
4358 PropertyList_add(plist, k, v);
4359 }
4360
4361 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4362 // Returns true if all of the source pointed by src has been copied over to
4363 // the destination buffer pointed by buf. Otherwise, returns false.
4364 // Notes:
4365 // 1. If the length (buflen) of the destination buffer excluding the
4366 // NULL terminator character is not long enough for holding the expanded
4367 // pid characters, it also returns false instead of returning the partially
4368 // expanded one.
4369 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4370 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4371 char* buf, size_t buflen) {
4372 const char* p = src;
4373 char* b = buf;
4374 const char* src_end = &src[srclen];
4375 char* buf_end = &buf[buflen - 1];
4376
4377 while (p < src_end && b < buf_end) {
4378 if (*p == '%') {
4379 switch (*(++p)) {
4380 case '%': // "%%" ==> "%"
4381 *b++ = *p++;
4382 break;
4383 case 'p': { // "%p" ==> current process id
4384 // buf_end points to the character before the last character so
4385 // that we could write '\0' to the end of the buffer.
4386 size_t buf_sz = buf_end - b + 1;
4387 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4388
4389 // if jio_snprintf fails or the buffer is not long enough to hold
4390 // the expanded pid, returns false.
4391 if (ret < 0 || ret >= (int)buf_sz) {
4392 return false;
4393 } else {
4394 b += ret;
4395 assert(*b == '\0', "fail in copy_expand_pid");
4396 if (p == src_end && b == buf_end + 1) {
4397 // reach the end of the buffer.
4398 return true;
4399 }
4400 }
4401 p++;
4402 break;
4403 }
4404 default :
4405 *b++ = '%';
4406 }
4407 } else {
4408 *b++ = *p++;
4409 }
4410 }
4411 *b = '\0';
4412 return (p == src_end); // return false if not all of the source was copied
4413 }