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