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