1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "compiler/compilerOracle.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/cardTableRS.hpp"
32 #include "memory/genCollectedHeap.hpp"
33 #include "memory/referenceProcessor.hpp"
34 #include "memory/universe.inline.hpp"
35 #include "oops/oop.inline.hpp"
36 #include "prims/jvmtiExport.hpp"
37 #include "runtime/arguments.hpp"
38 #include "runtime/arguments_ext.hpp"
39 #include "runtime/globals_extension.hpp"
40 #include "runtime/java.hpp"
41 #include "services/management.hpp"
42 #include "services/memTracker.hpp"
43 #include "utilities/defaultStream.hpp"
44 #include "utilities/macros.hpp"
45 #include "utilities/stringUtils.hpp"
46 #include "utilities/taskqueue.hpp"
47 #ifdef TARGET_OS_FAMILY_linux
48 # include "os_linux.inline.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_solaris
51 # include "os_solaris.inline.hpp"
52 #endif
53 #ifdef TARGET_OS_FAMILY_windows
54 # include "os_windows.inline.hpp"
55 #endif
56 #ifdef TARGET_OS_FAMILY_aix
57 # include "os_aix.inline.hpp"
58 #endif
59 #ifdef TARGET_OS_FAMILY_bsd
60 # include "os_bsd.inline.hpp"
61 #endif
62 #if INCLUDE_ALL_GCS
63 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
64 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
65 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
66 #include "gc_implementation/shenandoah/shenandoahHeap.hpp"
67 #include "gc_implementation/shenandoah/shenandoahLogging.hpp"
68 #endif // INCLUDE_ALL_GCS
69
70 // Note: This is a special bug reporting site for the JVM
71 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
72 #define DEFAULT_JAVA_LAUNCHER "generic"
73
74 // Disable options not supported in this release, with a warning if they
75 // were explicitly requested on the command-line
76 #define UNSUPPORTED_OPTION(opt, description) \
77 do { \
78 if (opt) { \
79 if (FLAG_IS_CMDLINE(opt)) { \
80 warning(description " is disabled in this release."); \
81 } \
82 FLAG_SET_DEFAULT(opt, false); \
83 } \
84 } while(0)
85
86 #define UNSUPPORTED_GC_OPTION(gc) \
87 do { \
88 if (gc) { \
89 if (FLAG_IS_CMDLINE(gc)) { \
90 warning(#gc " is not supported in this VM. Using Serial GC."); \
91 } \
92 FLAG_SET_DEFAULT(gc, false); \
93 } \
94 } while(0)
95
96 char** Arguments::_jvm_flags_array = NULL;
97 int Arguments::_num_jvm_flags = 0;
98 char** Arguments::_jvm_args_array = NULL;
99 int Arguments::_num_jvm_args = 0;
100 char* Arguments::_java_command = NULL;
101 SystemProperty* Arguments::_system_properties = NULL;
102 const char* Arguments::_gc_log_filename = NULL;
103 bool Arguments::_has_profile = false;
104 size_t Arguments::_conservative_max_heap_alignment = 0;
105 uintx Arguments::_min_heap_size = 0;
106 uintx Arguments::_min_heap_free_ratio = 0;
107 uintx Arguments::_max_heap_free_ratio = 0;
108 Arguments::Mode Arguments::_mode = _mixed;
109 bool Arguments::_java_compiler = false;
110 bool Arguments::_xdebug_mode = false;
111 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
112 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
113 int Arguments::_sun_java_launcher_pid = -1;
114 bool Arguments::_created_by_gamma_launcher = false;
115
116 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
117 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
118 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
119 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
120 bool Arguments::_ClipInlining = ClipInlining;
121
122 char* Arguments::SharedArchivePath = NULL;
123
124 AgentLibraryList Arguments::_libraryList;
125 AgentLibraryList Arguments::_agentList;
126
127 abort_hook_t Arguments::_abort_hook = NULL;
128 exit_hook_t Arguments::_exit_hook = NULL;
129 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
130
131
132 SystemProperty *Arguments::_java_ext_dirs = NULL;
133 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
134 SystemProperty *Arguments::_sun_boot_library_path = NULL;
135 SystemProperty *Arguments::_java_library_path = NULL;
136 SystemProperty *Arguments::_java_home = NULL;
137 SystemProperty *Arguments::_java_class_path = NULL;
138 SystemProperty *Arguments::_sun_boot_class_path = NULL;
139
140 char* Arguments::_meta_index_path = NULL;
141 char* Arguments::_meta_index_dir = NULL;
142
143 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
144
145 static bool match_option(const JavaVMOption *option, const char* name,
146 const char** tail) {
147 int len = (int)strlen(name);
148 if (strncmp(option->optionString, name, len) == 0) {
149 *tail = option->optionString + len;
150 return true;
151 } else {
152 return false;
153 }
154 }
155
156 static void logOption(const char* opt) {
157 if (PrintVMOptions) {
158 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
159 }
160 }
161
162 // Process java launcher properties.
163 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
164 // See if sun.java.launcher or sun.java.launcher.pid is defined.
165 // Must do this before setting up other system properties,
166 // as some of them may depend on launcher type.
167 for (int index = 0; index < args->nOptions; index++) {
168 const JavaVMOption* option = args->options + index;
169 const char* tail;
170
171 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
172 process_java_launcher_argument(tail, option->extraInfo);
173 continue;
174 }
175 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
176 _sun_java_launcher_pid = atoi(tail);
177 continue;
178 }
179 }
180 }
181
182 // Initialize system properties key and value.
183 void Arguments::init_system_properties() {
184
185 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
186 "Java Virtual Machine Specification", false));
187 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
188 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
190
191 // following are JVMTI agent writeable properties.
192 // Properties values are set to NULL and they are
193 // os specific they are initialized in os::init_system_properties_values().
194 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
195 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
196 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
197 _java_library_path = new SystemProperty("java.library.path", NULL, true);
198 _java_home = new SystemProperty("java.home", NULL, true);
199 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
200
201 _java_class_path = new SystemProperty("java.class.path", "", true);
202
203 // Add to System Property list.
204 PropertyList_add(&_system_properties, _java_ext_dirs);
205 PropertyList_add(&_system_properties, _java_endorsed_dirs);
206 PropertyList_add(&_system_properties, _sun_boot_library_path);
207 PropertyList_add(&_system_properties, _java_library_path);
208 PropertyList_add(&_system_properties, _java_home);
209 PropertyList_add(&_system_properties, _java_class_path);
210 PropertyList_add(&_system_properties, _sun_boot_class_path);
211
212 // Set OS specific system properties values
213 os::init_system_properties_values();
214 }
215
216
217 // Update/Initialize System properties after JDK version number is known
218 void Arguments::init_version_specific_system_properties() {
219 enum { bufsz = 16 };
220 char buffer[bufsz];
221 const char* spec_vendor = "Sun Microsystems Inc.";
222 uint32_t spec_version = 0;
223
224 if (JDK_Version::is_gte_jdk17x_version()) {
225 spec_vendor = "Oracle Corporation";
226 spec_version = JDK_Version::current().major_version();
227 }
228 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
229
230 PropertyList_add(&_system_properties,
231 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.specification.version", buffer, false));
234 PropertyList_add(&_system_properties,
235 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
236 }
237
238 /**
239 * Provide a slightly more user-friendly way of eliminating -XX flags.
240 * When a flag is eliminated, it can be added to this list in order to
241 * continue accepting this flag on the command-line, while issuing a warning
242 * and ignoring the value. Once the JDK version reaches the 'accept_until'
243 * limit, we flatly refuse to admit the existence of the flag. This allows
244 * a flag to die correctly over JDK releases using HSX.
245 */
246 typedef struct {
247 const char* name;
248 JDK_Version obsoleted_in; // when the flag went away
249 JDK_Version accept_until; // which version to start denying the existence
250 } ObsoleteFlag;
251
252 static ObsoleteFlag obsolete_jvm_flags[] = {
253 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
256 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
257 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
258 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
259 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
260 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
261 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
262 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
263 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
264 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
265 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
266 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
267 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
268 { "DefaultInitialRAMFraction",
269 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
270 { "UseDepthFirstScavengeOrder",
271 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
272 { "HandlePromotionFailure",
273 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
274 { "MaxLiveObjectEvacuationRatio",
275 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
276 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
277 { "UseParallelOldGCCompacting",
278 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
279 { "UseParallelDensePrefixUpdate",
280 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
281 { "UseParallelOldGCDensePrefix",
282 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
283 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
284 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
285 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
295 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
296 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
297 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
298 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
299 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
300 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
302 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
303 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
304 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
305 { "CompilationRepeat", JDK_Version::jdk(8), JDK_Version::jdk(9) },
306 #ifdef PRODUCT
307 { "DesiredMethodLimit",
308 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
309 #endif // PRODUCT
310 { NULL, JDK_Version(0), JDK_Version(0) }
311 };
312
313 // Returns true if the flag is obsolete and fits into the range specified
314 // for being ignored. In the case that the flag is ignored, the 'version'
315 // value is filled in with the version number when the flag became
316 // obsolete so that that value can be displayed to the user.
317 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
318 int i = 0;
319 assert(version != NULL, "Must provide a version buffer");
320 while (obsolete_jvm_flags[i].name != NULL) {
321 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
322 // <flag>=xxx form
323 // [-|+]<flag> form
324 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
325 ((s[0] == '+' || s[0] == '-') &&
326 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
327 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
328 *version = flag_status.obsoleted_in;
329 return true;
330 }
331 }
332 i++;
333 }
334 return false;
335 }
336
337 // Constructs the system class path (aka boot class path) from the following
338 // components, in order:
339 //
340 // prefix // from -Xbootclasspath/p:...
341 // endorsed // the expansion of -Djava.endorsed.dirs=...
342 // base // from os::get_system_properties() or -Xbootclasspath=
343 // suffix // from -Xbootclasspath/a:...
344 //
345 // java.endorsed.dirs is a list of directories; any jar or zip files in the
346 // directories are added to the sysclasspath just before the base.
347 //
348 // This could be AllStatic, but it isn't needed after argument processing is
349 // complete.
350 class SysClassPath: public StackObj {
351 public:
352 SysClassPath(const char* base);
353 ~SysClassPath();
354
355 inline void set_base(const char* base);
356 inline void add_prefix(const char* prefix);
357 inline void add_suffix_to_prefix(const char* suffix);
358 inline void add_suffix(const char* suffix);
359 inline void reset_path(const char* base);
360
361 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
362 // property. Must be called after all command-line arguments have been
363 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
364 // combined_path().
365 void expand_endorsed();
366
367 inline const char* get_base() const { return _items[_scp_base]; }
368 inline const char* get_prefix() const { return _items[_scp_prefix]; }
369 inline const char* get_suffix() const { return _items[_scp_suffix]; }
370 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
371
372 // Combine all the components into a single c-heap-allocated string; caller
373 // must free the string if/when no longer needed.
374 char* combined_path();
375
376 private:
377 // Utility routines.
378 static char* add_to_path(const char* path, const char* str, bool prepend);
379 static char* add_jars_to_path(char* path, const char* directory);
380
381 inline void reset_item_at(int index);
382
383 // Array indices for the items that make up the sysclasspath. All except the
384 // base are allocated in the C heap and freed by this class.
385 enum {
386 _scp_prefix, // from -Xbootclasspath/p:...
387 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
388 _scp_base, // the default sysclasspath
389 _scp_suffix, // from -Xbootclasspath/a:...
390 _scp_nitems // the number of items, must be last.
391 };
392
393 const char* _items[_scp_nitems];
394 DEBUG_ONLY(bool _expansion_done;)
395 };
396
397 SysClassPath::SysClassPath(const char* base) {
398 memset(_items, 0, sizeof(_items));
399 _items[_scp_base] = base;
400 DEBUG_ONLY(_expansion_done = false;)
401 }
402
403 SysClassPath::~SysClassPath() {
404 // Free everything except the base.
405 for (int i = 0; i < _scp_nitems; ++i) {
406 if (i != _scp_base) reset_item_at(i);
407 }
408 DEBUG_ONLY(_expansion_done = false;)
409 }
410
411 inline void SysClassPath::set_base(const char* base) {
412 _items[_scp_base] = base;
413 }
414
415 inline void SysClassPath::add_prefix(const char* prefix) {
416 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
417 }
418
419 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
420 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
421 }
422
423 inline void SysClassPath::add_suffix(const char* suffix) {
424 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
425 }
426
427 inline void SysClassPath::reset_item_at(int index) {
428 assert(index < _scp_nitems && index != _scp_base, "just checking");
429 if (_items[index] != NULL) {
430 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
431 _items[index] = NULL;
432 }
433 }
434
435 inline void SysClassPath::reset_path(const char* base) {
436 // Clear the prefix and suffix.
437 reset_item_at(_scp_prefix);
438 reset_item_at(_scp_suffix);
439 set_base(base);
440 }
441
442 //------------------------------------------------------------------------------
443
444 void SysClassPath::expand_endorsed() {
445 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
446
447 const char* path = Arguments::get_property("java.endorsed.dirs");
448 if (path == NULL) {
449 path = Arguments::get_endorsed_dir();
450 assert(path != NULL, "no default for java.endorsed.dirs");
451 }
452
453 char* expanded_path = NULL;
454 const char separator = *os::path_separator();
455 const char* const end = path + strlen(path);
456 while (path < end) {
457 const char* tmp_end = strchr(path, separator);
458 if (tmp_end == NULL) {
459 expanded_path = add_jars_to_path(expanded_path, path);
460 path = end;
461 } else {
462 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
463 memcpy(dirpath, path, tmp_end - path);
464 dirpath[tmp_end - path] = '\0';
465 expanded_path = add_jars_to_path(expanded_path, dirpath);
466 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
467 path = tmp_end + 1;
468 }
469 }
470 _items[_scp_endorsed] = expanded_path;
471 DEBUG_ONLY(_expansion_done = true;)
472 }
473
474 // Combine the bootclasspath elements, some of which may be null, into a single
475 // c-heap-allocated string.
476 char* SysClassPath::combined_path() {
477 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
478 assert(_expansion_done, "must call expand_endorsed() first.");
479
480 size_t lengths[_scp_nitems];
481 size_t total_len = 0;
482
483 const char separator = *os::path_separator();
484
485 // Get the lengths.
486 int i;
487 for (i = 0; i < _scp_nitems; ++i) {
488 if (_items[i] != NULL) {
489 lengths[i] = strlen(_items[i]);
490 // Include space for the separator char (or a NULL for the last item).
491 total_len += lengths[i] + 1;
492 }
493 }
494 assert(total_len > 0, "empty sysclasspath not allowed");
495
496 // Copy the _items to a single string.
497 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
498 char* cp_tmp = cp;
499 for (i = 0; i < _scp_nitems; ++i) {
500 if (_items[i] != NULL) {
501 memcpy(cp_tmp, _items[i], lengths[i]);
502 cp_tmp += lengths[i];
503 *cp_tmp++ = separator;
504 }
505 }
506 *--cp_tmp = '\0'; // Replace the extra separator.
507 return cp;
508 }
509
510 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
511 char*
512 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
513 char *cp;
514
515 assert(str != NULL, "just checking");
516 if (path == NULL) {
517 size_t len = strlen(str) + 1;
518 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
519 memcpy(cp, str, len); // copy the trailing null
520 } else {
521 const char separator = *os::path_separator();
522 size_t old_len = strlen(path);
523 size_t str_len = strlen(str);
524 size_t len = old_len + str_len + 2;
525
526 if (prepend) {
527 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
528 char* cp_tmp = cp;
529 memcpy(cp_tmp, str, str_len);
530 cp_tmp += str_len;
531 *cp_tmp = separator;
532 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
533 FREE_C_HEAP_ARRAY(char, path, mtInternal);
534 } else {
535 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
536 char* cp_tmp = cp + old_len;
537 *cp_tmp = separator;
538 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
539 }
540 }
541 return cp;
542 }
543
544 // Scan the directory and append any jar or zip files found to path.
545 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
546 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
547 DIR* dir = os::opendir(directory);
548 if (dir == NULL) return path;
549
550 char dir_sep[2] = { '\0', '\0' };
551 size_t directory_len = strlen(directory);
552 const char fileSep = *os::file_separator();
553 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
554
555 /* Scan the directory for jars/zips, appending them to path. */
556 struct dirent *entry;
557 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
558 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
559 const char* name = entry->d_name;
560 const char* ext = name + strlen(name) - 4;
561 bool isJarOrZip = ext > name &&
562 (os::file_name_strcmp(ext, ".jar") == 0 ||
563 os::file_name_strcmp(ext, ".zip") == 0);
564 if (isJarOrZip) {
565 size_t length = directory_len + 2 + strlen(name);
566 char* jarpath = NEW_C_HEAP_ARRAY(char, length, mtInternal);
567 jio_snprintf(jarpath, length, "%s%s%s", directory, dir_sep, name);
568 path = add_to_path(path, jarpath, false);
569 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
570 }
571 }
572 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
573 os::closedir(dir);
574 return path;
575 }
576
577 // Parses a memory size specification string.
578 static bool atomull(const char *s, julong* result) {
579 julong n = 0;
580 int args_read = sscanf(s, JULONG_FORMAT, &n);
581 if (args_read != 1) {
582 return false;
583 }
584 while (*s != '\0' && isdigit(*s)) {
585 s++;
586 }
587 // 4705540: illegal if more characters are found after the first non-digit
588 if (strlen(s) > 1) {
589 return false;
590 }
591 switch (*s) {
592 case 'T': case 't':
593 *result = n * G * K;
594 // Check for overflow.
595 if (*result/((julong)G * K) != n) return false;
596 return true;
597 case 'G': case 'g':
598 *result = n * G;
599 if (*result/G != n) return false;
600 return true;
601 case 'M': case 'm':
602 *result = n * M;
603 if (*result/M != n) return false;
604 return true;
605 case 'K': case 'k':
606 *result = n * K;
607 if (*result/K != n) return false;
608 return true;
609 case '\0':
610 *result = n;
611 return true;
612 default:
613 return false;
614 }
615 }
616
617 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
618 if (size < min_size) return arg_too_small;
619 // Check that size will fit in a size_t (only relevant on 32-bit)
620 if (size > max_uintx) return arg_too_big;
621 return arg_in_range;
622 }
623
624 // Describe an argument out of range error
625 void Arguments::describe_range_error(ArgsRange errcode) {
626 switch(errcode) {
627 case arg_too_big:
628 jio_fprintf(defaultStream::error_stream(),
629 "The specified size exceeds the maximum "
630 "representable size.\n");
631 break;
632 case arg_too_small:
633 case arg_unreadable:
634 case arg_in_range:
635 // do nothing for now
636 break;
637 default:
638 ShouldNotReachHere();
639 }
640 }
641
642 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
643 return CommandLineFlags::boolAtPut(name, &value, origin);
644 }
645
646 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
647 double v;
648 if (sscanf(value, "%lf", &v) != 1) {
649 return false;
650 }
651
652 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
653 return true;
654 }
655 return false;
656 }
657
658 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
659 julong v;
660 intx intx_v;
661 bool is_neg = false;
662 // Check the sign first since atomull() parses only unsigned values.
663 if (*value == '-') {
664 if (!CommandLineFlags::intxAt(name, &intx_v)) {
665 return false;
666 }
667 value++;
668 is_neg = true;
669 }
670 if (!atomull(value, &v)) {
671 return false;
672 }
673 intx_v = (intx) v;
674 if (is_neg) {
675 intx_v = -intx_v;
676 }
677 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
678 return true;
679 }
680 uintx uintx_v = (uintx) v;
681 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
682 return true;
683 }
684 uint64_t uint64_t_v = (uint64_t) v;
685 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
686 return true;
687 }
688 return false;
689 }
690
691 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
692 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
693 // Contract: CommandLineFlags always returns a pointer that needs freeing.
694 FREE_C_HEAP_ARRAY(char, value, mtInternal);
695 return true;
696 }
697
698 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
699 const char* old_value = "";
700 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
701 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
702 size_t new_len = strlen(new_value);
703 const char* value;
704 char* free_this_too = NULL;
705 if (old_len == 0) {
706 value = new_value;
707 } else if (new_len == 0) {
708 value = old_value;
709 } else {
710 size_t length = old_len + 1 + new_len + 1;
711 char* buf = NEW_C_HEAP_ARRAY(char, length, mtInternal);
712 // each new setting adds another LINE to the switch:
713 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
714 value = buf;
715 free_this_too = buf;
716 }
717 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
718 // CommandLineFlags always returns a pointer that needs freeing.
719 FREE_C_HEAP_ARRAY(char, value, mtInternal);
720 if (free_this_too != NULL) {
721 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
722 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
723 }
724 return true;
725 }
726
727 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
728
729 // range of acceptable characters spelled out for portability reasons
730 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
731 #define BUFLEN 255
732 char name[BUFLEN+1];
733 char dummy;
734
735 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
736 return set_bool_flag(name, false, origin);
737 }
738 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
739 return set_bool_flag(name, true, origin);
740 }
741
742 char punct;
743 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
744 const char* value = strchr(arg, '=') + 1;
745 Flag* flag = Flag::find_flag(name, strlen(name));
746 if (flag != NULL && flag->is_ccstr()) {
747 if (flag->ccstr_accumulates()) {
748 return append_to_string_flag(name, value, origin);
749 } else {
750 if (value[0] == '\0') {
751 value = NULL;
752 }
753 return set_string_flag(name, value, origin);
754 }
755 }
756 }
757
758 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
759 const char* value = strchr(arg, '=') + 1;
760 // -XX:Foo:=xxx will reset the string flag to the given value.
761 if (value[0] == '\0') {
762 value = NULL;
763 }
764 return set_string_flag(name, value, origin);
765 }
766
767 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
768 #define SIGNED_NUMBER_RANGE "[-0123456789]"
769 #define NUMBER_RANGE "[0123456789]"
770 char value[BUFLEN + 1];
771 char value2[BUFLEN + 1];
772 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
773 // Looks like a floating-point number -- try again with more lenient format string
774 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
775 return set_fp_numeric_flag(name, value, origin);
776 }
777 }
778
779 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
780 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
781 return set_numeric_flag(name, value, origin);
782 }
783
784 return false;
785 }
786
787 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
788 assert(bldarray != NULL, "illegal argument");
789
790 if (arg == NULL) {
791 return;
792 }
793
794 int new_count = *count + 1;
795
796 // expand the array and add arg to the last element
797 if (*bldarray == NULL) {
798 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
799 } else {
800 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
801 }
802 (*bldarray)[*count] = strdup(arg);
803 *count = new_count;
804 }
805
806 void Arguments::build_jvm_args(const char* arg) {
807 add_string(&_jvm_args_array, &_num_jvm_args, arg);
808 }
809
810 void Arguments::build_jvm_flags(const char* arg) {
811 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
812 }
813
814 // utility function to return a string that concatenates all
815 // strings in a given char** array
816 const char* Arguments::build_resource_string(char** args, int count) {
817 if (args == NULL || count == 0) {
818 return NULL;
819 }
820 size_t length = 0;
821 for (int i = 0; i < count; i++) {
822 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
823 }
824 char* s = NEW_RESOURCE_ARRAY(char, length);
825 char* dst = s;
826 for (int j = 0; j < count; j++) {
827 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
828 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
829 dst += offset;
830 length -= offset;
831 }
832 return (const char*) s;
833 }
834
835 void Arguments::print_on(outputStream* st) {
836 st->print_cr("VM Arguments:");
837 if (num_jvm_flags() > 0) {
838 st->print("jvm_flags: "); print_jvm_flags_on(st);
839 }
840 if (num_jvm_args() > 0) {
841 st->print("jvm_args: "); print_jvm_args_on(st);
842 }
843 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
844 if (_java_class_path != NULL) {
845 char* path = _java_class_path->value();
846 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
847 }
848 st->print_cr("Launcher Type: %s", _sun_java_launcher);
849 }
850
851 void Arguments::print_jvm_flags_on(outputStream* st) {
852 if (_num_jvm_flags > 0) {
853 for (int i=0; i < _num_jvm_flags; i++) {
854 st->print("%s ", _jvm_flags_array[i]);
855 }
856 st->cr();
857 }
858 }
859
860 void Arguments::print_jvm_args_on(outputStream* st) {
861 if (_num_jvm_args > 0) {
862 for (int i=0; i < _num_jvm_args; i++) {
863 st->print("%s ", _jvm_args_array[i]);
864 }
865 st->cr();
866 }
867 }
868
869 bool Arguments::process_argument(const char* arg,
870 jboolean ignore_unrecognized, Flag::Flags origin) {
871
872 JDK_Version since = JDK_Version();
873
874 if (parse_argument(arg, origin) || ignore_unrecognized) {
875 return true;
876 }
877
878 bool has_plus_minus = (*arg == '+' || *arg == '-');
879 const char* const argname = has_plus_minus ? arg + 1 : arg;
880 if (is_newly_obsolete(arg, &since)) {
881 char version[256];
882 since.to_string(version, sizeof(version));
883 warning("ignoring option %s; support was removed in %s", argname, version);
884 return true;
885 }
886
887 // For locked flags, report a custom error message if available.
888 // Otherwise, report the standard unrecognized VM option.
889
890 size_t arg_len;
891 const char* equal_sign = strchr(argname, '=');
892 if (equal_sign == NULL) {
893 arg_len = strlen(argname);
894 } else {
895 arg_len = equal_sign - argname;
896 }
897
898 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
899 if (found_flag != NULL) {
900 char locked_message_buf[BUFLEN];
901 found_flag->get_locked_message(locked_message_buf, BUFLEN);
902 if (strlen(locked_message_buf) == 0) {
903 if (found_flag->is_bool() && !has_plus_minus) {
904 jio_fprintf(defaultStream::error_stream(),
905 "Missing +/- setting for VM option '%s'\n", argname);
906 } else if (!found_flag->is_bool() && has_plus_minus) {
907 jio_fprintf(defaultStream::error_stream(),
908 "Unexpected +/- setting in VM option '%s'\n", argname);
909 } else {
910 jio_fprintf(defaultStream::error_stream(),
911 "Improperly specified VM option '%s'\n", argname);
912 }
913 } else {
914 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
915 }
916 } else {
917 jio_fprintf(defaultStream::error_stream(),
918 "Unrecognized VM option '%s'\n", argname);
919 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
920 if (fuzzy_matched != NULL) {
921 jio_fprintf(defaultStream::error_stream(),
922 "Did you mean '%s%s%s'?\n",
923 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
924 fuzzy_matched->_name,
925 (fuzzy_matched->is_bool()) ? "" : "=<value>");
926 }
927 }
928
929 // allow for commandline "commenting out" options like -XX:#+Verbose
930 return arg[0] == '#';
931 }
932
933 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
934 FILE* stream = fopen(file_name, "rb");
935 if (stream == NULL) {
936 if (should_exist) {
937 jio_fprintf(defaultStream::error_stream(),
938 "Could not open settings file %s\n", file_name);
939 return false;
940 } else {
941 return true;
942 }
943 }
944
945 char token[1024];
946 int pos = 0;
947
948 bool in_white_space = true;
949 bool in_comment = false;
950 bool in_quote = false;
951 char quote_c = 0;
952 bool result = true;
953
954 int c = getc(stream);
955 while(c != EOF && pos < (int)(sizeof(token)-1)) {
956 if (in_white_space) {
957 if (in_comment) {
958 if (c == '\n') in_comment = false;
959 } else {
960 if (c == '#') in_comment = true;
961 else if (!isspace(c)) {
962 in_white_space = false;
963 token[pos++] = c;
964 }
965 }
966 } else {
967 if (c == '\n' || (!in_quote && isspace(c))) {
968 // token ends at newline, or at unquoted whitespace
969 // this allows a way to include spaces in string-valued options
970 token[pos] = '\0';
971 logOption(token);
972 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
973 build_jvm_flags(token);
974 pos = 0;
975 in_white_space = true;
976 in_quote = false;
977 } else if (!in_quote && (c == '\'' || c == '"')) {
978 in_quote = true;
979 quote_c = c;
980 } else if (in_quote && (c == quote_c)) {
981 in_quote = false;
982 } else {
983 token[pos++] = c;
984 }
985 }
986 c = getc(stream);
987 }
988 if (pos > 0) {
989 token[pos] = '\0';
990 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
991 build_jvm_flags(token);
992 }
993 fclose(stream);
994 return result;
995 }
996
997 //=============================================================================================================
998 // Parsing of properties (-D)
999
1000 const char* Arguments::get_property(const char* key) {
1001 return PropertyList_get_value(system_properties(), key);
1002 }
1003
1004 bool Arguments::add_property(const char* prop) {
1005 const char* eq = strchr(prop, '=');
1006 char* key;
1007 // ns must be static--its address may be stored in a SystemProperty object.
1008 const static char ns[1] = {0};
1009 char* value = (char *)ns;
1010
1011 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1012 key = AllocateHeap(key_len + 1, mtInternal);
1013 strncpy(key, prop, key_len);
1014 key[key_len] = '\0';
1015
1016 if (eq != NULL) {
1017 size_t value_len = strlen(prop) - key_len - 1;
1018 value = AllocateHeap(value_len + 1, mtInternal);
1019 strncpy(value, &prop[key_len + 1], value_len + 1);
1020 }
1021
1022 if (strcmp(key, "java.compiler") == 0) {
1023 process_java_compiler_argument(value);
1024 FreeHeap(key);
1025 if (eq != NULL) {
1026 FreeHeap(value);
1027 }
1028 return true;
1029 } else if (strcmp(key, "sun.java.command") == 0) {
1030 _java_command = value;
1031
1032 // Record value in Arguments, but let it get passed to Java.
1033 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1034 // launcher.pid property is private and is processed
1035 // in process_sun_java_launcher_properties();
1036 // the sun.java.launcher property is passed on to the java application
1037 FreeHeap(key);
1038 if (eq != NULL) {
1039 FreeHeap(value);
1040 }
1041 return true;
1042 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1043 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1044 // its value without going through the property list or making a Java call.
1045 _java_vendor_url_bug = value;
1046 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1047 PropertyList_unique_add(&_system_properties, key, value, true);
1048 return true;
1049 }
1050 // Create new property and add at the end of the list
1051 PropertyList_unique_add(&_system_properties, key, value);
1052 return true;
1053 }
1054
1055 //===========================================================================================================
1056 // Setting int/mixed/comp mode flags
1057
1058 void Arguments::set_mode_flags(Mode mode) {
1059 // Set up default values for all flags.
1060 // If you add a flag to any of the branches below,
1061 // add a default value for it here.
1062 set_java_compiler(false);
1063 _mode = mode;
1064
1065 // Ensure Agent_OnLoad has the correct initial values.
1066 // This may not be the final mode; mode may change later in onload phase.
1067 PropertyList_unique_add(&_system_properties, "java.vm.info",
1068 (char*)VM_Version::vm_info_string(), false);
1069
1070 UseInterpreter = true;
1071 UseCompiler = true;
1072 UseLoopCounter = true;
1073
1074 #ifndef ZERO
1075 // Turn these off for mixed and comp. Leave them on for Zero.
1076 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1077 UseFastAccessorMethods = (mode == _int);
1078 }
1079 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1080 UseFastEmptyMethods = (mode == _int);
1081 }
1082 #endif
1083
1084 // Default values may be platform/compiler dependent -
1085 // use the saved values
1086 ClipInlining = Arguments::_ClipInlining;
1087 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1088 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1089 BackgroundCompilation = Arguments::_BackgroundCompilation;
1090
1091 // Change from defaults based on mode
1092 switch (mode) {
1093 default:
1094 ShouldNotReachHere();
1095 break;
1096 case _int:
1097 UseCompiler = false;
1098 UseLoopCounter = false;
1099 AlwaysCompileLoopMethods = false;
1100 UseOnStackReplacement = false;
1101 break;
1102 case _mixed:
1103 // same as default
1104 break;
1105 case _comp:
1106 UseInterpreter = false;
1107 BackgroundCompilation = false;
1108 ClipInlining = false;
1109 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1110 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1111 // compile a level 4 (C2) and then continue executing it.
1112 if (TieredCompilation) {
1113 Tier3InvokeNotifyFreqLog = 0;
1114 Tier4InvocationThreshold = 0;
1115 }
1116 break;
1117 }
1118 }
1119
1120 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1121 // Conflict: required to use shared spaces (-Xshare:on), but
1122 // incompatible command line options were chosen.
1123
1124 static void no_shared_spaces(const char* message) {
1125 if (RequireSharedSpaces) {
1126 jio_fprintf(defaultStream::error_stream(),
1127 "Class data sharing is inconsistent with other specified options.\n");
1128 vm_exit_during_initialization("Unable to use shared archive.", message);
1129 } else {
1130 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1131 }
1132 }
1133 #endif
1134
1135 void Arguments::set_tiered_flags() {
1136 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1137 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1138 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1139 }
1140 if (CompilationPolicyChoice < 2) {
1141 vm_exit_during_initialization(
1142 "Incompatible compilation policy selected", NULL);
1143 }
1144 // Increase the code cache size - tiered compiles a lot more.
1145 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1146 NOT_AARCH64(FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5));
1147 AARCH64_ONLY(FLAG_SET_DEFAULT(ReservedCodeCacheSize,
1148 MIN2(CODE_CACHE_DEFAULT_LIMIT, 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 (!ClassUnloading) {
1385 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1386 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1387 FLAG_SET_CMDLINE(uintx, ShenandoahUnloadClassesFrequency, 0);
1388 }
1389
1390 if (PrintGCDetails && Verbose) {
1391 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1392 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1393 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1394 }
1395 }
1396 #endif // INCLUDE_ALL_GCS
1397
1398 void set_object_alignment() {
1399 // Object alignment.
1400 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1401 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1402 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1403 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1404 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1405 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1406
1407 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1408 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1409
1410 // Oop encoding heap max
1411 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1412
1413 #if INCLUDE_ALL_GCS
1414 // Set CMS global values
1415 CompactibleFreeListSpace::set_cms_values();
1416 #endif // INCLUDE_ALL_GCS
1417 }
1418
1419 bool verify_object_alignment() {
1420 // Object alignment.
1421 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1422 jio_fprintf(defaultStream::error_stream(),
1423 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1424 (int)ObjectAlignmentInBytes);
1425 return false;
1426 }
1427 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1428 jio_fprintf(defaultStream::error_stream(),
1429 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1430 (int)ObjectAlignmentInBytes, BytesPerLong);
1431 return false;
1432 }
1433 // It does not make sense to have big object alignment
1434 // since a space lost due to alignment will be greater
1435 // then a saved space from compressed oops.
1436 if ((int)ObjectAlignmentInBytes > 256) {
1437 jio_fprintf(defaultStream::error_stream(),
1438 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1439 (int)ObjectAlignmentInBytes);
1440 return false;
1441 }
1442 // In case page size is very small.
1443 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1444 jio_fprintf(defaultStream::error_stream(),
1445 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1446 (int)ObjectAlignmentInBytes, os::vm_page_size());
1447 return false;
1448 }
1449 if(SurvivorAlignmentInBytes == 0) {
1450 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1451 } else {
1452 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1453 jio_fprintf(defaultStream::error_stream(),
1454 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1455 (int)SurvivorAlignmentInBytes);
1456 return false;
1457 }
1458 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1459 jio_fprintf(defaultStream::error_stream(),
1460 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1461 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1462 return false;
1463 }
1464 }
1465 return true;
1466 }
1467
1468 size_t Arguments::max_heap_for_compressed_oops() {
1469 // Avoid sign flip.
1470 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1471 // We need to fit both the NULL page and the heap into the memory budget, while
1472 // keeping alignment constraints of the heap. To guarantee the latter, as the
1473 // NULL page is located before the heap, we pad the NULL page to the conservative
1474 // maximum alignment that the GC may ever impose upon the heap.
1475 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1476 _conservative_max_heap_alignment);
1477
1478 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1479 NOT_LP64(ShouldNotReachHere(); return 0);
1480 }
1481
1482 bool Arguments::should_auto_select_low_pause_collector() {
1483 if (UseAutoGCSelectPolicy &&
1484 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1485 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1486 if (PrintGCDetails) {
1487 // Cannot use gclog_or_tty yet.
1488 tty->print_cr("Automatic selection of the low pause collector"
1489 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1490 }
1491 return true;
1492 }
1493 return false;
1494 }
1495
1496 void Arguments::set_use_compressed_oops() {
1497 #ifndef ZERO
1498 #ifdef _LP64
1499 // MaxHeapSize is not set up properly at this point, but
1500 // the only value that can override MaxHeapSize if we are
1501 // to use UseCompressedOops is InitialHeapSize.
1502 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1503
1504 if (max_heap_size <= max_heap_for_compressed_oops()) {
1505 #if !defined(COMPILER1) || defined(TIERED)
1506 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1507 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1508 }
1509 #endif
1510 #ifdef _WIN64
1511 if (UseLargePages && UseCompressedOops) {
1512 // Cannot allocate guard pages for implicit checks in indexed addressing
1513 // mode, when large pages are specified on windows.
1514 // This flag could be switched ON if narrow oop base address is set to 0,
1515 // see code in Universe::initialize_heap().
1516 Universe::set_narrow_oop_use_implicit_null_checks(false);
1517 }
1518 #endif // _WIN64
1519 } else {
1520 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1521 warning("Max heap size too large for Compressed Oops");
1522 FLAG_SET_DEFAULT(UseCompressedOops, false);
1523 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1524 }
1525 }
1526 #endif // _LP64
1527 #endif // ZERO
1528 }
1529
1530 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1531 // set_use_compressed_oops().
1532 void Arguments::set_use_compressed_klass_ptrs() {
1533 #ifndef ZERO
1534 #ifdef _LP64
1535 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1536 if (!UseCompressedOops) {
1537 if (UseCompressedClassPointers) {
1538 warning("UseCompressedClassPointers requires UseCompressedOops");
1539 }
1540 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1541 } else {
1542 // Turn on UseCompressedClassPointers too
1543 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1544 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1545 }
1546 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1547 if (UseCompressedClassPointers) {
1548 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1549 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1550 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1551 }
1552 }
1553 }
1554 #endif // _LP64
1555 #endif // !ZERO
1556 }
1557
1558 void Arguments::set_conservative_max_heap_alignment() {
1559 // The conservative maximum required alignment for the heap is the maximum of
1560 // the alignments imposed by several sources: any requirements from the heap
1561 // itself, the collector policy and the maximum page size we may run the VM
1562 // with.
1563 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1564 #if INCLUDE_ALL_GCS
1565 if (UseParallelGC) {
1566 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1567 } else if (UseG1GC) {
1568 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1569 } else if (UseShenandoahGC) {
1570 heap_alignment = ShenandoahHeap::conservative_max_heap_alignment();
1571 }
1572 #endif // INCLUDE_ALL_GCS
1573 _conservative_max_heap_alignment = MAX4(heap_alignment,
1574 (size_t)os::vm_allocation_granularity(),
1575 os::max_page_size(),
1576 CollectorPolicy::compute_heap_alignment());
1577 }
1578
1579 void Arguments::select_gc_ergonomically() {
1580 if (os::is_server_class_machine()) {
1581 if (should_auto_select_low_pause_collector()) {
1582 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1583 } else {
1584 FLAG_SET_ERGO(bool, UseParallelGC, true);
1585 }
1586 }
1587 }
1588
1589 void Arguments::select_gc() {
1590 if (!gc_selected()) {
1591 select_gc_ergonomically();
1592 }
1593 }
1594
1595 void Arguments::set_ergonomics_flags() {
1596 select_gc();
1597
1598 #ifdef COMPILER2
1599 // Shared spaces work fine with other GCs but causes bytecode rewriting
1600 // to be disabled, which hurts interpreter performance and decreases
1601 // server performance. When -server is specified, keep the default off
1602 // unless it is asked for. Future work: either add bytecode rewriting
1603 // at link time, or rewrite bytecodes in non-shared methods.
1604 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1605 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1606 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1607 }
1608 #endif
1609
1610 set_conservative_max_heap_alignment();
1611
1612 #ifndef ZERO
1613 #ifdef _LP64
1614 set_use_compressed_oops();
1615
1616 // set_use_compressed_klass_ptrs() must be called after calling
1617 // set_use_compressed_oops().
1618 set_use_compressed_klass_ptrs();
1619
1620 // Also checks that certain machines are slower with compressed oops
1621 // in vm_version initialization code.
1622 #endif // _LP64
1623 #endif // !ZERO
1624 }
1625
1626 void Arguments::set_parallel_gc_flags() {
1627 assert(UseParallelGC || UseParallelOldGC, "Error");
1628 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1629 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1630 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1631 }
1632 FLAG_SET_DEFAULT(UseParallelGC, true);
1633
1634 // If no heap maximum was requested explicitly, use some reasonable fraction
1635 // of the physical memory, up to a maximum of 1GB.
1636 FLAG_SET_DEFAULT(ParallelGCThreads,
1637 Abstract_VM_Version::parallel_worker_threads());
1638 if (ParallelGCThreads == 0) {
1639 jio_fprintf(defaultStream::error_stream(),
1640 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1641 vm_exit(1);
1642 }
1643
1644 if (UseAdaptiveSizePolicy) {
1645 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1646 // unless the user actually sets these flags.
1647 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1648 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1649 _min_heap_free_ratio = MinHeapFreeRatio;
1650 }
1651 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1652 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1653 _max_heap_free_ratio = MaxHeapFreeRatio;
1654 }
1655 }
1656
1657 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1658 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1659 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1660 // See CR 6362902 for details.
1661 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1662 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1663 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1664 }
1665 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1666 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1667 }
1668 }
1669
1670 if (UseParallelOldGC) {
1671 // Par compact uses lower default values since they are treated as
1672 // minimums. These are different defaults because of the different
1673 // interpretation and are not ergonomically set.
1674 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1675 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1676 }
1677 }
1678 }
1679
1680 void Arguments::set_g1_gc_flags() {
1681 assert(UseG1GC, "Error");
1682 #ifdef COMPILER1
1683 FastTLABRefill = false;
1684 #endif
1685 FLAG_SET_DEFAULT(ParallelGCThreads,
1686 Abstract_VM_Version::parallel_worker_threads());
1687 if (ParallelGCThreads == 0) {
1688 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1689 }
1690
1691 #if INCLUDE_ALL_GCS
1692 if (G1ConcRefinementThreads == 0) {
1693 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1694 }
1695 #endif
1696
1697 // MarkStackSize will be set (if it hasn't been set by the user)
1698 // when concurrent marking is initialized.
1699 // Its value will be based upon the number of parallel marking threads.
1700 // But we do set the maximum mark stack size here.
1701 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1702 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1703 }
1704
1705 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1706 // In G1, we want the default GC overhead goal to be higher than
1707 // say in PS. So we set it here to 10%. Otherwise the heap might
1708 // be expanded more aggressively than we would like it to. In
1709 // fact, even 10% seems to not be high enough in some cases
1710 // (especially small GC stress tests that the main thing they do
1711 // is allocation). We might consider increase it further.
1712 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1713 }
1714
1715 if (PrintGCDetails && Verbose) {
1716 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1717 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1718 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1719 }
1720 }
1721
1722 void Arguments::set_shenandoah_gc_flags() {
1723
1724 #if !(defined AARCH64 || defined AMD64 || defined IA32)
1725 UNSUPPORTED_GC_OPTION(UseShenandoahGC);
1726 #endif
1727
1728 #ifdef IA32
1729 warning("Shenandoah GC is not fully supported on this platform:");
1730 warning(" concurrent modes are not supported, only STW cycles are enabled;");
1731 warning(" arch-specific barrier code is not implemented, disabling barriers;");
1732
1733 #if INCLUDE_ALL_GCS
1734 FLAG_SET_DEFAULT(ShenandoahGCHeuristics, "passive");
1735
1736 FLAG_SET_DEFAULT(ShenandoahSATBBarrier, false);
1737 FLAG_SET_DEFAULT(ShenandoahWriteBarrier, false);
1738 FLAG_SET_DEFAULT(ShenandoahReadBarrier, false);
1739 FLAG_SET_DEFAULT(ShenandoahCASBarrier, false);
1740 FLAG_SET_DEFAULT(ShenandoahAcmpBarrier, false);
1741 FLAG_SET_DEFAULT(ShenandoahCloneBarrier, false);
1742 #endif
1743 #endif
1744
1745 #if INCLUDE_ALL_GCS
1746 if (!FLAG_IS_DEFAULT(ShenandoahGarbageThreshold)) {
1747 if (0 > ShenandoahGarbageThreshold || ShenandoahGarbageThreshold > 100) {
1748 vm_exit_during_initialization("The flag -XX:ShenandoahGarbageThreshold is out of range", NULL);
1749 }
1750 }
1751
1752 if (!FLAG_IS_DEFAULT(ShenandoahAllocationThreshold)) {
1753 if (0 > ShenandoahAllocationThreshold || ShenandoahAllocationThreshold > 100) {
1754 vm_exit_during_initialization("The flag -XX:ShenandoahAllocationThreshold is out of range", NULL);
1755 }
1756 }
1757
1758 if (!FLAG_IS_DEFAULT(ShenandoahFreeThreshold)) {
1759 if (0 > ShenandoahFreeThreshold || ShenandoahFreeThreshold > 100) {
1760 vm_exit_during_initialization("The flag -XX:ShenandoahFreeThreshold is out of range", NULL);
1761 }
1762 }
1763 #endif
1764
1765 #ifdef _LP64
1766 // The optimized ObjArrayChunkedTask takes some bits away from the full 64 addressable
1767 // bits, fail if we ever attempt to address more than we can. Only valid on 64bit.
1768 if (MaxHeapSize >= ObjArrayChunkedTask::max_addressable()) {
1769 jio_fprintf(defaultStream::error_stream(),
1770 "Shenandoah GC cannot address more than " SIZE_FORMAT " bytes, and " SIZE_FORMAT " bytes heap requested.",
1771 ObjArrayChunkedTask::max_addressable(), MaxHeapSize);
1772 vm_exit(1);
1773 }
1774 #endif
1775
1776 FLAG_SET_DEFAULT(ParallelGCThreads,
1777 Abstract_VM_Version::parallel_worker_threads());
1778
1779 if (FLAG_IS_DEFAULT(ConcGCThreads)) {
1780 uint conc_threads = MAX2((uint) 1, (uint)ParallelGCThreads);
1781 FLAG_SET_DEFAULT(ConcGCThreads, conc_threads);
1782 }
1783
1784 if (FLAG_IS_DEFAULT(ParallelRefProcEnabled)) {
1785 FLAG_SET_DEFAULT(ParallelRefProcEnabled, true);
1786 }
1787
1788 #if INCLUDE_ALL_GCS
1789 if (ShenandoahRegionSampling && FLAG_IS_DEFAULT(PerfDataMemorySize)) {
1790 // When sampling is enabled, max out the PerfData memory to get more
1791 // Shenandoah data in, including Matrix.
1792 FLAG_SET_DEFAULT(PerfDataMemorySize, 2048*K);
1793 }
1794 #endif
1795
1796 #ifdef COMPILER2
1797 // Shenandoah cares more about pause times, rather than raw throughput.
1798 // Enabling safepoints in counted loops makes it more responsive with
1799 // long loops.
1800 if (FLAG_IS_DEFAULT(UseCountedLoopSafepoints)) {
1801 FLAG_SET_DEFAULT(UseCountedLoopSafepoints, true);
1802 }
1803
1804 #ifdef ASSERT
1805 // C2 barrier verification is only reliable when all default barriers are enabled
1806 if (ShenandoahVerifyOptoBarriers &&
1807 (!FLAG_IS_DEFAULT(ShenandoahSATBBarrier) ||
1808 !FLAG_IS_DEFAULT(ShenandoahReadBarrier) ||
1809 !FLAG_IS_DEFAULT(ShenandoahWriteBarrier) ||
1810 !FLAG_IS_DEFAULT(ShenandoahCASBarrier) ||
1811 !FLAG_IS_DEFAULT(ShenandoahAcmpBarrier) ||
1812 !FLAG_IS_DEFAULT(ShenandoahCloneBarrier)
1813 )) {
1814 warning("Unusual barrier configuration, disabling C2 barrier verification");
1815 FLAG_SET_DEFAULT(ShenandoahVerifyOptoBarriers, false);
1816 }
1817 #else
1818 guarantee(!ShenandoahVerifyOptoBarriers, "Should be disabled");
1819 #endif // ASSERT
1820 #endif // COMPILER2
1821
1822 #if INCLUDE_ALL_GCS
1823 if (AlwaysPreTouch) {
1824 // Shenandoah handles pre-touch on its own. It does not let the
1825 // generic storage code to do the pre-touch before Shenandoah has
1826 // a chance to do it on its own.
1827 FLAG_SET_DEFAULT(AlwaysPreTouch, false);
1828 FLAG_SET_DEFAULT(ShenandoahAlwaysPreTouch, true);
1829 }
1830
1831 if (ShenandoahAlwaysPreTouch) {
1832 if (!FLAG_IS_DEFAULT(ShenandoahUncommit)) {
1833 warning("AlwaysPreTouch is enabled, disabling ShenandoahUncommit");
1834 }
1835 FLAG_SET_DEFAULT(ShenandoahUncommit, false);
1836 }
1837 #endif
1838 }
1839
1840 #if !INCLUDE_ALL_GCS
1841 #ifdef ASSERT
1842 static bool verify_serial_gc_flags() {
1843 return (UseSerialGC &&
1844 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1845 UseParallelGC || UseParallelOldGC));
1846 }
1847 #endif // ASSERT
1848 #endif // INCLUDE_ALL_GCS
1849
1850 void Arguments::set_gc_specific_flags() {
1851 #if INCLUDE_ALL_GCS
1852 // Set per-collector flags
1853 if (UseParallelGC || UseParallelOldGC) {
1854 set_parallel_gc_flags();
1855 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1856 set_cms_and_parnew_gc_flags();
1857 } else if (UseParNewGC) { // Skipped if CMS is set above
1858 set_parnew_gc_flags();
1859 } else if (UseG1GC) {
1860 set_g1_gc_flags();
1861 } else if (UseShenandoahGC) {
1862 set_shenandoah_gc_flags();
1863 }
1864 check_deprecated_gcs();
1865 check_deprecated_gc_flags();
1866 if (AssumeMP && !UseSerialGC) {
1867 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1868 warning("If the number of processors is expected to increase from one, then"
1869 " you should configure the number of parallel GC threads appropriately"
1870 " using -XX:ParallelGCThreads=N");
1871 }
1872 }
1873 if (MinHeapFreeRatio == 100) {
1874 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1875 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1876 }
1877 #else // INCLUDE_ALL_GCS
1878 assert(verify_serial_gc_flags(), "SerialGC unset");
1879 #endif // INCLUDE_ALL_GCS
1880 }
1881
1882 julong Arguments::limit_by_allocatable_memory(julong limit) {
1883 julong max_allocatable;
1884 julong result = limit;
1885 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1886 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1887 }
1888 return result;
1889 }
1890
1891 void Arguments::set_heap_size() {
1892 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1893 // Deprecated flag
1894 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1895 }
1896
1897 julong phys_mem =
1898 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1899 : (julong)MaxRAM;
1900
1901 // Experimental support for CGroup memory limits
1902 if (UseCGroupMemoryLimitForHeap) {
1903 // This is a rough indicator that a CGroup limit may be in force
1904 // for this process
1905 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1906 FILE *fp = fopen(lim_file, "r");
1907 if (fp != NULL) {
1908 julong cgroup_max = 0;
1909 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
1910 if (ret == 1 && cgroup_max > 0) {
1911 // If unlimited, cgroup_max will be a very large, but unspecified
1912 // value, so use initial phys_mem as a limit
1913 if (PrintGCDetails && Verbose) {
1914 // Cannot use gclog_or_tty yet.
1915 tty->print_cr("Setting phys_mem to the min of cgroup limit ("
1916 JULONG_FORMAT "MB) and initial phys_mem ("
1917 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
1918 }
1919 phys_mem = MIN2(cgroup_max, phys_mem);
1920 } else {
1921 warning("Unable to read/parse cgroup memory limit from %s: %s",
1922 lim_file, errno != 0 ? strerror(errno) : "unknown error");
1923 }
1924 fclose(fp);
1925 } else {
1926 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
1927 }
1928 }
1929
1930 // If the maximum heap size has not been set with -Xmx,
1931 // then set it as fraction of the size of physical memory,
1932 // respecting the maximum and minimum sizes of the heap.
1933 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1934 julong reasonable_max = phys_mem / MaxRAMFraction;
1935
1936 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1937 // Small physical memory, so use a minimum fraction of it for the heap
1938 reasonable_max = phys_mem / MinRAMFraction;
1939 } else {
1940 // Not-small physical memory, so require a heap at least
1941 // as large as MaxHeapSize
1942 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1943 }
1944 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1945 // Limit the heap size to ErgoHeapSizeLimit
1946 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1947 }
1948 if (UseCompressedOops) {
1949 // Limit the heap size to the maximum possible when using compressed oops
1950 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1951 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1952 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1953 // but it should be not less than default MaxHeapSize.
1954 max_coop_heap -= HeapBaseMinAddress;
1955 }
1956 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1957 }
1958 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1959
1960 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1961 // An initial heap size was specified on the command line,
1962 // so be sure that the maximum size is consistent. Done
1963 // after call to limit_by_allocatable_memory because that
1964 // method might reduce the allocation size.
1965 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1966 }
1967
1968 if (PrintGCDetails && Verbose) {
1969 // Cannot use gclog_or_tty yet.
1970 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1971 }
1972 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1973 }
1974
1975 // If the minimum or initial heap_size have not been set or requested to be set
1976 // ergonomically, set them accordingly.
1977 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1978 julong reasonable_minimum = (julong)(OldSize + NewSize);
1979
1980 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1981
1982 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1983
1984 if (InitialHeapSize == 0) {
1985 julong reasonable_initial = phys_mem / InitialRAMFraction;
1986
1987 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1988 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1989
1990 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1991
1992 if (PrintGCDetails && Verbose) {
1993 // Cannot use gclog_or_tty yet.
1994 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1995 }
1996 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1997 }
1998 // If the minimum heap size has not been set (via -Xms),
1999 // synchronize with InitialHeapSize to avoid errors with the default value.
2000 if (min_heap_size() == 0) {
2001 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
2002 if (PrintGCDetails && Verbose) {
2003 // Cannot use gclog_or_tty yet.
2004 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2005 }
2006 }
2007 }
2008 }
2009
2010 // This must be called after ergonomics because we want bytecode rewriting
2011 // if the server compiler is used, or if UseSharedSpaces is disabled.
2012 void Arguments::set_bytecode_flags() {
2013 // Better not attempt to store into a read-only space.
2014 if (UseSharedSpaces) {
2015 FLAG_SET_DEFAULT(RewriteBytecodes, false);
2016 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2017 }
2018
2019 if (!RewriteBytecodes) {
2020 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2021 }
2022 }
2023
2024 // Aggressive optimization flags -XX:+AggressiveOpts
2025 void Arguments::set_aggressive_opts_flags() {
2026 #ifdef COMPILER2
2027 if (AggressiveUnboxing) {
2028 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2029 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2030 } else if (!EliminateAutoBox) {
2031 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2032 AggressiveUnboxing = false;
2033 }
2034 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2035 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2036 } else if (!DoEscapeAnalysis) {
2037 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2038 AggressiveUnboxing = false;
2039 }
2040 }
2041 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2042 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2043 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2044 }
2045 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2046 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2047 }
2048
2049 // Feed the cache size setting into the JDK
2050 char buffer[1024];
2051 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2052 add_property(buffer);
2053 }
2054 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2055 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2056 }
2057 #endif
2058
2059 if (AggressiveOpts) {
2060 // Sample flag setting code
2061 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2062 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2063 // }
2064 }
2065 }
2066
2067 //===========================================================================================================
2068 // Parsing of java.compiler property
2069
2070 void Arguments::process_java_compiler_argument(char* arg) {
2071 // For backwards compatibility, Djava.compiler=NONE or ""
2072 // causes us to switch to -Xint mode UNLESS -Xdebug
2073 // is also specified.
2074 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2075 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2076 }
2077 }
2078
2079 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2080 _sun_java_launcher = strdup(launcher);
2081 if (strcmp("gamma", _sun_java_launcher) == 0) {
2082 _created_by_gamma_launcher = true;
2083 }
2084 }
2085
2086 bool Arguments::created_by_java_launcher() {
2087 assert(_sun_java_launcher != NULL, "property must have value");
2088 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2089 }
2090
2091 bool Arguments::created_by_gamma_launcher() {
2092 return _created_by_gamma_launcher;
2093 }
2094
2095 //===========================================================================================================
2096 // Parsing of main arguments
2097
2098 bool Arguments::verify_interval(uintx val, uintx min,
2099 uintx max, const char* name) {
2100 // Returns true iff value is in the inclusive interval [min..max]
2101 // false, otherwise.
2102 if (val >= min && val <= max) {
2103 return true;
2104 }
2105 jio_fprintf(defaultStream::error_stream(),
2106 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
2107 " and " UINTX_FORMAT "\n",
2108 name, val, min, max);
2109 return false;
2110 }
2111
2112 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2113 // Returns true if given value is at least specified min threshold
2114 // false, otherwise.
2115 if (val >= min ) {
2116 return true;
2117 }
2118 jio_fprintf(defaultStream::error_stream(),
2119 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2120 name, val, min);
2121 return false;
2122 }
2123
2124 bool Arguments::verify_percentage(uintx value, const char* name) {
2125 if (is_percentage(value)) {
2126 return true;
2127 }
2128 jio_fprintf(defaultStream::error_stream(),
2129 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2130 name, value);
2131 return false;
2132 }
2133
2134 // check if do gclog rotation
2135 // +UseGCLogFileRotation is a must,
2136 // no gc log rotation when log file not supplied or
2137 // NumberOfGCLogFiles is 0
2138 void check_gclog_consistency() {
2139 if (UseGCLogFileRotation) {
2140 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2141 jio_fprintf(defaultStream::output_stream(),
2142 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2143 "where num_of_file > 0\n"
2144 "GC log rotation is turned off\n");
2145 UseGCLogFileRotation = false;
2146 }
2147 }
2148
2149 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2150 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2151 jio_fprintf(defaultStream::output_stream(),
2152 "GCLogFileSize changed to minimum 8K\n");
2153 }
2154
2155 // Record more information about previous cycles for improved debugging pleasure
2156 if (FLAG_IS_DEFAULT(LogEventsBufferEntries)) {
2157 FLAG_SET_DEFAULT(LogEventsBufferEntries, 250);
2158 }
2159
2160 #if INCLUDE_ALL_GCS
2161 if (ShenandoahConcurrentEvacCodeRoots) {
2162 if (!ShenandoahBarriersForConst) {
2163 if (FLAG_IS_DEFAULT(ShenandoahBarriersForConst)) {
2164 warning("Concurrent code cache evacuation is enabled, enabling barriers for constants.");
2165 FLAG_SET_DEFAULT(ShenandoahBarriersForConst, true);
2166 } else {
2167 warning("Concurrent code cache evacuation is enabled, but barriers for constants are disabled. "
2168 "This may lead to surprising crashes.");
2169 }
2170 }
2171 } else {
2172 if (ShenandoahBarriersForConst) {
2173 if (FLAG_IS_DEFAULT(ShenandoahBarriersForConst)) {
2174 warning("Concurrent code cache evacuation is disabled, disabling barriers for constants.");
2175 FLAG_SET_DEFAULT(ShenandoahBarriersForConst, false);
2176 }
2177 }
2178 }
2179
2180 if (AlwaysPreTouch || ShenandoahAlwaysPreTouch) {
2181 if (!FLAG_IS_DEFAULT(ShenandoahUncommitDelay)) {
2182 warning("AlwaysPreTouch is enabled, disabling ShenandoahUncommitDelay");
2183 }
2184 FLAG_SET_DEFAULT(ShenandoahUncommitDelay, max_uintx);
2185 }
2186 #endif
2187 }
2188
2189 // This function is called for -Xloggc:<filename>, it can be used
2190 // to check if a given file name(or string) conforms to the following
2191 // specification:
2192 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2193 // %p and %t only allowed once. We only limit usage of filename not path
2194 bool is_filename_valid(const char *file_name) {
2195 const char* p = file_name;
2196 char file_sep = os::file_separator()[0];
2197 const char* cp;
2198 // skip prefix path
2199 for (cp = file_name; *cp != '\0'; cp++) {
2200 if (*cp == '/' || *cp == file_sep) {
2201 p = cp + 1;
2202 }
2203 }
2204
2205 int count_p = 0;
2206 int count_t = 0;
2207 while (*p != '\0') {
2208 if ((*p >= '0' && *p <= '9') ||
2209 (*p >= 'A' && *p <= 'Z') ||
2210 (*p >= 'a' && *p <= 'z') ||
2211 *p == '-' ||
2212 *p == '_' ||
2213 *p == '.') {
2214 p++;
2215 continue;
2216 }
2217 if (*p == '%') {
2218 if(*(p + 1) == 'p') {
2219 p += 2;
2220 count_p ++;
2221 continue;
2222 }
2223 if (*(p + 1) == 't') {
2224 p += 2;
2225 count_t ++;
2226 continue;
2227 }
2228 }
2229 return false;
2230 }
2231 return count_p < 2 && count_t < 2;
2232 }
2233
2234 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2235 if (!is_percentage(min_heap_free_ratio)) {
2236 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2237 return false;
2238 }
2239 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2240 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2241 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2242 MaxHeapFreeRatio);
2243 return false;
2244 }
2245 // This does not set the flag itself, but stores the value in a safe place for later usage.
2246 _min_heap_free_ratio = min_heap_free_ratio;
2247 return true;
2248 }
2249
2250 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2251 if (!is_percentage(max_heap_free_ratio)) {
2252 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2253 return false;
2254 }
2255 if (max_heap_free_ratio < MinHeapFreeRatio) {
2256 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2257 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2258 MinHeapFreeRatio);
2259 return false;
2260 }
2261 // This does not set the flag itself, but stores the value in a safe place for later usage.
2262 _max_heap_free_ratio = max_heap_free_ratio;
2263 return true;
2264 }
2265
2266 // Check consistency of GC selection
2267 bool Arguments::check_gc_consistency() {
2268 check_gclog_consistency();
2269 bool status = true;
2270 // Ensure that the user has not selected conflicting sets
2271 // of collectors. [Note: this check is merely a user convenience;
2272 // collectors over-ride each other so that only a non-conflicting
2273 // set is selected; however what the user gets is not what they
2274 // may have expected from the combination they asked for. It's
2275 // better to reduce user confusion by not allowing them to
2276 // select conflicting combinations.
2277 uint i = 0;
2278 if (UseSerialGC) i++;
2279 if (UseConcMarkSweepGC || UseParNewGC) i++;
2280 if (UseParallelGC || UseParallelOldGC) i++;
2281 if (UseG1GC) i++;
2282 if (UseShenandoahGC) i++;
2283 if (i > 1) {
2284 jio_fprintf(defaultStream::error_stream(),
2285 "Conflicting collector combinations in option list; "
2286 "please refer to the release notes for the combinations "
2287 "allowed\n");
2288 status = false;
2289 }
2290 return status;
2291 }
2292
2293 void Arguments::check_deprecated_gcs() {
2294 if (UseConcMarkSweepGC && !UseParNewGC) {
2295 warning("Using the DefNew young collector with the CMS collector is deprecated "
2296 "and will likely be removed in a future release");
2297 }
2298
2299 if (UseParNewGC && !UseConcMarkSweepGC) {
2300 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2301 // set up UseSerialGC properly, so that can't be used in the check here.
2302 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2303 "and will likely be removed in a future release");
2304 }
2305
2306 if (CMSIncrementalMode) {
2307 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2308 }
2309 }
2310
2311 void Arguments::check_deprecated_gc_flags() {
2312 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2313 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2314 "and will likely be removed in future release");
2315 }
2316 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2317 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2318 "Use MaxRAMFraction instead.");
2319 }
2320 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2321 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2322 }
2323 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2324 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2325 }
2326 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2327 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2328 }
2329 }
2330
2331 // Check stack pages settings
2332 bool Arguments::check_stack_pages()
2333 {
2334 bool status = true;
2335 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2336 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2337 // greater stack shadow pages can't generate instruction to bang stack
2338 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2339 return status;
2340 }
2341
2342 // Check the consistency of vm_init_args
2343 bool Arguments::check_vm_args_consistency() {
2344 // Method for adding checks for flag consistency.
2345 // The intent is to warn the user of all possible conflicts,
2346 // before returning an error.
2347 // Note: Needs platform-dependent factoring.
2348 bool status = true;
2349
2350 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2351 // builds so the cost of stack banging can be measured.
2352 #if (defined(PRODUCT) && defined(SOLARIS))
2353 if (!UseBoundThreads && !UseStackBanging) {
2354 jio_fprintf(defaultStream::error_stream(),
2355 "-UseStackBanging conflicts with -UseBoundThreads\n");
2356
2357 status = false;
2358 }
2359 #endif
2360
2361 if (TLABRefillWasteFraction == 0) {
2362 jio_fprintf(defaultStream::error_stream(),
2363 "TLABRefillWasteFraction should be a denominator, "
2364 "not " SIZE_FORMAT "\n",
2365 TLABRefillWasteFraction);
2366 status = false;
2367 }
2368
2369 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2370 "AdaptiveSizePolicyWeight");
2371 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2372
2373 // Divide by bucket size to prevent a large size from causing rollover when
2374 // calculating amount of memory needed to be allocated for the String table.
2375 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2376 (max_uintx / StringTable::bucket_size()), "StringTable size");
2377
2378 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2379 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2380
2381 {
2382 // Using "else if" below to avoid printing two error messages if min > max.
2383 // This will also prevent us from reporting both min>100 and max>100 at the
2384 // same time, but that is less annoying than printing two identical errors IMHO.
2385 FormatBuffer<80> err_msg("%s","");
2386 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2387 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2388 status = false;
2389 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2390 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2391 status = false;
2392 }
2393 }
2394
2395 // Min/MaxMetaspaceFreeRatio
2396 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2397 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2398
2399 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2400 jio_fprintf(defaultStream::error_stream(),
2401 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2402 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2403 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2404 MinMetaspaceFreeRatio,
2405 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2406 MaxMetaspaceFreeRatio);
2407 status = false;
2408 }
2409
2410 // Trying to keep 100% free is not practical
2411 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2412
2413 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2414 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2415 }
2416
2417 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2418 // Settings to encourage splitting.
2419 if (!FLAG_IS_CMDLINE(NewRatio)) {
2420 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2421 }
2422 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2423 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2424 }
2425 }
2426
2427 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2428 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2429 if (GCTimeLimit == 100) {
2430 // Turn off gc-overhead-limit-exceeded checks
2431 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2432 }
2433
2434 status = status && check_gc_consistency();
2435 status = status && check_stack_pages();
2436
2437 if (CMSIncrementalMode) {
2438 if (!UseConcMarkSweepGC) {
2439 jio_fprintf(defaultStream::error_stream(),
2440 "error: invalid argument combination.\n"
2441 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2442 "selected in order\nto use CMSIncrementalMode.\n");
2443 status = false;
2444 } else {
2445 status = status && verify_percentage(CMSIncrementalDutyCycle,
2446 "CMSIncrementalDutyCycle");
2447 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2448 "CMSIncrementalDutyCycleMin");
2449 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2450 "CMSIncrementalSafetyFactor");
2451 status = status && verify_percentage(CMSIncrementalOffset,
2452 "CMSIncrementalOffset");
2453 status = status && verify_percentage(CMSExpAvgFactor,
2454 "CMSExpAvgFactor");
2455 // If it was not set on the command line, set
2456 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2457 if (CMSInitiatingOccupancyFraction < 0) {
2458 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2459 }
2460 }
2461 }
2462
2463 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2464 // insists that we hold the requisite locks so that the iteration is
2465 // MT-safe. For the verification at start-up and shut-down, we don't
2466 // yet have a good way of acquiring and releasing these locks,
2467 // which are not visible at the CollectedHeap level. We want to
2468 // be able to acquire these locks and then do the iteration rather
2469 // than just disable the lock verification. This will be fixed under
2470 // bug 4788986.
2471 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2472 if (VerifyDuringStartup) {
2473 warning("Heap verification at start-up disabled "
2474 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2475 VerifyDuringStartup = false; // Disable verification at start-up
2476 }
2477
2478 if (VerifyBeforeExit) {
2479 warning("Heap verification at shutdown disabled "
2480 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2481 VerifyBeforeExit = false; // Disable verification at shutdown
2482 }
2483 }
2484
2485 // Note: only executed in non-PRODUCT mode
2486 if (!UseAsyncConcMarkSweepGC &&
2487 (ExplicitGCInvokesConcurrent ||
2488 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2489 jio_fprintf(defaultStream::error_stream(),
2490 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2491 " with -UseAsyncConcMarkSweepGC");
2492 status = false;
2493 }
2494
2495 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2496
2497 #if INCLUDE_ALL_GCS
2498 if (UseG1GC) {
2499 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2500 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2501 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2502
2503 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2504 "InitiatingHeapOccupancyPercent");
2505 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2506 "G1RefProcDrainInterval");
2507 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2508 "G1ConcMarkStepDurationMillis");
2509 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2510 "G1ConcRSHotCardLimit");
2511 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2512 "G1ConcRSLogCacheSize");
2513 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2514 "StringDeduplicationAgeThreshold");
2515 }
2516 if (UseConcMarkSweepGC) {
2517 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2518 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2519 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2520 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2521
2522 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2523
2524 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2525 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2526 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2527
2528 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2529
2530 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2531 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2532
2533 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2534 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2535 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2536
2537 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2538
2539 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2540
2541 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2542 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2543 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2544 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2545 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2546 }
2547
2548 if (UseParallelGC || UseParallelOldGC) {
2549 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2550 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2551
2552 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2553 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2554
2555 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2556 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2557
2558 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2559
2560 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2561 }
2562 #endif // INCLUDE_ALL_GCS
2563
2564 status = status && verify_interval(RefDiscoveryPolicy,
2565 ReferenceProcessor::DiscoveryPolicyMin,
2566 ReferenceProcessor::DiscoveryPolicyMax,
2567 "RefDiscoveryPolicy");
2568
2569 // Limit the lower bound of this flag to 1 as it is used in a division
2570 // expression.
2571 status = status && verify_interval(TLABWasteTargetPercent,
2572 1, 100, "TLABWasteTargetPercent");
2573
2574 status = status && verify_object_alignment();
2575
2576 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2577 "CompressedClassSpaceSize");
2578
2579 status = status && verify_interval(MarkStackSizeMax,
2580 1, (max_jint - 1), "MarkStackSizeMax");
2581 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2582
2583 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2584
2585 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2586
2587 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2588
2589 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2590 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2591
2592 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2593
2594 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2595 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2596 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2597 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2598
2599 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2600 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2601
2602 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2603 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2604 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2605
2606 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2607 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2608
2609 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2610 // just for that, so hardcode here.
2611 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2612 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2613 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2614 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2615
2616 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2617 #ifdef COMPILER1
2618 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2619 #endif
2620
2621 if (PrintNMTStatistics) {
2622 #if INCLUDE_NMT
2623 if (MemTracker::tracking_level() == NMT_off) {
2624 #endif // INCLUDE_NMT
2625 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2626 PrintNMTStatistics = false;
2627 #if INCLUDE_NMT
2628 }
2629 #endif
2630 }
2631
2632 // Need to limit the extent of the padding to reasonable size.
2633 // 8K is well beyond the reasonable HW cache line size, even with the
2634 // aggressive prefetching, while still leaving the room for segregating
2635 // among the distinct pages.
2636 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2637 jio_fprintf(defaultStream::error_stream(),
2638 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2639 ContendedPaddingWidth, 0, 8192);
2640 status = false;
2641 }
2642
2643 // Need to enforce the padding not to break the existing field alignments.
2644 // It is sufficient to check against the largest type size.
2645 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2646 jio_fprintf(defaultStream::error_stream(),
2647 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2648 ContendedPaddingWidth, BytesPerLong);
2649 status = false;
2650 }
2651
2652 // Check lower bounds of the code cache
2653 // Template Interpreter code is approximately 3X larger in debug builds.
2654 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2655 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2656 jio_fprintf(defaultStream::error_stream(),
2657 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2658 os::vm_page_size()/K);
2659 status = false;
2660 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2661 jio_fprintf(defaultStream::error_stream(),
2662 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2663 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2664 status = false;
2665 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2666 jio_fprintf(defaultStream::error_stream(),
2667 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2668 min_code_cache_size/K);
2669 status = false;
2670 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2671 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2672 jio_fprintf(defaultStream::error_stream(),
2673 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2674 CODE_CACHE_SIZE_LIMIT/M);
2675 status = false;
2676 }
2677
2678 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2679 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2680
2681 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2682 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2683 }
2684
2685 #ifdef COMPILER1
2686 status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
2687 #endif
2688
2689 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2690 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2691 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2692 // Check the minimum number of compiler threads
2693 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2694
2695 return status;
2696 }
2697
2698 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2699 const char* option_type) {
2700 if (ignore) return false;
2701
2702 const char* spacer = " ";
2703 if (option_type == NULL) {
2704 option_type = ++spacer; // Set both to the empty string.
2705 }
2706
2707 if (os::obsolete_option(option)) {
2708 jio_fprintf(defaultStream::error_stream(),
2709 "Obsolete %s%soption: %s\n", option_type, spacer,
2710 option->optionString);
2711 return false;
2712 } else {
2713 jio_fprintf(defaultStream::error_stream(),
2714 "Unrecognized %s%soption: %s\n", option_type, spacer,
2715 option->optionString);
2716 return true;
2717 }
2718 }
2719
2720 static const char* user_assertion_options[] = {
2721 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2722 };
2723
2724 static const char* system_assertion_options[] = {
2725 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2726 };
2727
2728 // Return true if any of the strings in null-terminated array 'names' matches.
2729 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2730 // the option must match exactly.
2731 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2732 bool tail_allowed) {
2733 for (/* empty */; *names != NULL; ++names) {
2734 if (match_option(option, *names, tail)) {
2735 if (**tail == '\0' || tail_allowed && **tail == ':') {
2736 return true;
2737 }
2738 }
2739 }
2740 return false;
2741 }
2742
2743 bool Arguments::parse_uintx(const char* value,
2744 uintx* uintx_arg,
2745 uintx min_size) {
2746
2747 // Check the sign first since atomull() parses only unsigned values.
2748 bool value_is_positive = !(*value == '-');
2749
2750 if (value_is_positive) {
2751 julong n;
2752 bool good_return = atomull(value, &n);
2753 if (good_return) {
2754 bool above_minimum = n >= min_size;
2755 bool value_is_too_large = n > max_uintx;
2756
2757 if (above_minimum && !value_is_too_large) {
2758 *uintx_arg = n;
2759 return true;
2760 }
2761 }
2762 }
2763 return false;
2764 }
2765
2766 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2767 julong* long_arg,
2768 julong min_size) {
2769 if (!atomull(s, long_arg)) return arg_unreadable;
2770 return check_memory_size(*long_arg, min_size);
2771 }
2772
2773 // Parse JavaVMInitArgs structure
2774
2775 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2776 // For components of the system classpath.
2777 SysClassPath scp(Arguments::get_sysclasspath());
2778 bool scp_assembly_required = false;
2779
2780 // Save default settings for some mode flags
2781 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2782 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2783 Arguments::_ClipInlining = ClipInlining;
2784 Arguments::_BackgroundCompilation = BackgroundCompilation;
2785
2786 // Setup flags for mixed which is the default
2787 set_mode_flags(_mixed);
2788
2789 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2790 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2791 if (result != JNI_OK) {
2792 return result;
2793 }
2794
2795 // Parse JavaVMInitArgs structure passed in
2796 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2797 if (result != JNI_OK) {
2798 return result;
2799 }
2800
2801 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2802 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2803 if (result != JNI_OK) {
2804 return result;
2805 }
2806
2807 // Do final processing now that all arguments have been parsed
2808 result = finalize_vm_init_args(&scp, scp_assembly_required);
2809 if (result != JNI_OK) {
2810 return result;
2811 }
2812
2813 return JNI_OK;
2814 }
2815
2816 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2817 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2818 // are dealing with -agentpath (case where name is a path), otherwise with
2819 // -agentlib
2820 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2821 char *_name;
2822 const char *_hprof = "hprof", *_jdwp = "jdwp";
2823 size_t _len_hprof, _len_jdwp, _len_prefix;
2824
2825 if (is_path) {
2826 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2827 return false;
2828 }
2829
2830 _name++; // skip past last path separator
2831 _len_prefix = strlen(JNI_LIB_PREFIX);
2832
2833 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2834 return false;
2835 }
2836
2837 _name += _len_prefix;
2838 _len_hprof = strlen(_hprof);
2839 _len_jdwp = strlen(_jdwp);
2840
2841 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2842 _name += _len_hprof;
2843 }
2844 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2845 _name += _len_jdwp;
2846 }
2847 else {
2848 return false;
2849 }
2850
2851 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2852 return false;
2853 }
2854
2855 return true;
2856 }
2857
2858 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2859 return true;
2860 }
2861
2862 return false;
2863 }
2864
2865 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2866 SysClassPath* scp_p,
2867 bool* scp_assembly_required_p,
2868 Flag::Flags origin) {
2869 // Remaining part of option string
2870 const char* tail;
2871
2872 // iterate over arguments
2873 for (int index = 0; index < args->nOptions; index++) {
2874 bool is_absolute_path = false; // for -agentpath vs -agentlib
2875
2876 const JavaVMOption* option = args->options + index;
2877
2878 if (!match_option(option, "-Djava.class.path", &tail) &&
2879 !match_option(option, "-Dsun.java.command", &tail) &&
2880 !match_option(option, "-Dsun.java.launcher", &tail)) {
2881
2882 // add all jvm options to the jvm_args string. This string
2883 // is used later to set the java.vm.args PerfData string constant.
2884 // the -Djava.class.path and the -Dsun.java.command options are
2885 // omitted from jvm_args string as each have their own PerfData
2886 // string constant object.
2887 build_jvm_args(option->optionString);
2888 }
2889
2890 // -verbose:[class/gc/jni]
2891 if (match_option(option, "-verbose", &tail)) {
2892 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2893 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2894 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2895 } else if (!strcmp(tail, ":gc")) {
2896 FLAG_SET_CMDLINE(bool, PrintGC, true);
2897 } else if (!strcmp(tail, ":jni")) {
2898 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2899 }
2900 // -da / -ea / -disableassertions / -enableassertions
2901 // These accept an optional class/package name separated by a colon, e.g.,
2902 // -da:java.lang.Thread.
2903 } else if (match_option(option, user_assertion_options, &tail, true)) {
2904 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2905 if (*tail == '\0') {
2906 JavaAssertions::setUserClassDefault(enable);
2907 } else {
2908 assert(*tail == ':', "bogus match by match_option()");
2909 JavaAssertions::addOption(tail + 1, enable);
2910 }
2911 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2912 } else if (match_option(option, system_assertion_options, &tail, false)) {
2913 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2914 JavaAssertions::setSystemClassDefault(enable);
2915 // -bootclasspath:
2916 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2917 scp_p->reset_path(tail);
2918 *scp_assembly_required_p = true;
2919 // -bootclasspath/a:
2920 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2921 scp_p->add_suffix(tail);
2922 *scp_assembly_required_p = true;
2923 // -bootclasspath/p:
2924 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2925 scp_p->add_prefix(tail);
2926 *scp_assembly_required_p = true;
2927 // -Xrun
2928 } else if (match_option(option, "-Xrun", &tail)) {
2929 if (tail != NULL) {
2930 const char* pos = strchr(tail, ':');
2931 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2932 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2933 name[len] = '\0';
2934
2935 char *options = NULL;
2936 if(pos != NULL) {
2937 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2938 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2939 }
2940 #if !INCLUDE_JVMTI
2941 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2942 jio_fprintf(defaultStream::error_stream(),
2943 "Profiling and debugging agents are not supported in this VM\n");
2944 return JNI_ERR;
2945 }
2946 #endif // !INCLUDE_JVMTI
2947 add_init_library(name, options);
2948 }
2949 // -agentlib and -agentpath
2950 } else if (match_option(option, "-agentlib:", &tail) ||
2951 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2952 if(tail != NULL) {
2953 const char* pos = strchr(tail, '=');
2954 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2955 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2956 name[len] = '\0';
2957
2958 char *options = NULL;
2959 if(pos != NULL) {
2960 size_t length = strlen(pos + 1) + 1;
2961 options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2962 jio_snprintf(options, length, "%s", pos + 1);
2963 }
2964 #if !INCLUDE_JVMTI
2965 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2966 jio_fprintf(defaultStream::error_stream(),
2967 "Profiling and debugging agents are not supported in this VM\n");
2968 return JNI_ERR;
2969 }
2970 #endif // !INCLUDE_JVMTI
2971 add_init_agent(name, options, is_absolute_path);
2972 }
2973 // -javaagent
2974 } else if (match_option(option, "-javaagent:", &tail)) {
2975 #if !INCLUDE_JVMTI
2976 jio_fprintf(defaultStream::error_stream(),
2977 "Instrumentation agents are not supported in this VM\n");
2978 return JNI_ERR;
2979 #else
2980 if(tail != NULL) {
2981 size_t length = strlen(tail) + 1;
2982 char *options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
2983 jio_snprintf(options, length, "%s", tail);
2984 add_init_agent("instrument", options, false);
2985 }
2986 #endif // !INCLUDE_JVMTI
2987 // -Xnoclassgc
2988 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2989 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2990 // -Xincgc: i-CMS
2991 } else if (match_option(option, "-Xincgc", &tail)) {
2992 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2993 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2994 // -Xnoincgc: no i-CMS
2995 } else if (match_option(option, "-Xnoincgc", &tail)) {
2996 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2997 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2998 // -Xconcgc
2999 } else if (match_option(option, "-Xconcgc", &tail)) {
3000 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
3001 // -Xnoconcgc
3002 } else if (match_option(option, "-Xnoconcgc", &tail)) {
3003 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
3004 // -Xbatch
3005 } else if (match_option(option, "-Xbatch", &tail)) {
3006 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3007 // -Xmn for compatibility with other JVM vendors
3008 } else if (match_option(option, "-Xmn", &tail)) {
3009 julong long_initial_young_size = 0;
3010 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
3011 if (errcode != arg_in_range) {
3012 jio_fprintf(defaultStream::error_stream(),
3013 "Invalid initial young generation size: %s\n", option->optionString);
3014 describe_range_error(errcode);
3015 return JNI_EINVAL;
3016 }
3017 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
3018 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
3019 // -Xms
3020 } else if (match_option(option, "-Xms", &tail)) {
3021 julong long_initial_heap_size = 0;
3022 // an initial heap size of 0 means automatically determine
3023 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
3024 if (errcode != arg_in_range) {
3025 jio_fprintf(defaultStream::error_stream(),
3026 "Invalid initial heap size: %s\n", option->optionString);
3027 describe_range_error(errcode);
3028 return JNI_EINVAL;
3029 }
3030 set_min_heap_size((uintx)long_initial_heap_size);
3031 // Currently the minimum size and the initial heap sizes are the same.
3032 // Can be overridden with -XX:InitialHeapSize.
3033 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
3034 // -Xmx
3035 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
3036 julong long_max_heap_size = 0;
3037 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
3038 if (errcode != arg_in_range) {
3039 jio_fprintf(defaultStream::error_stream(),
3040 "Invalid maximum heap size: %s\n", option->optionString);
3041 describe_range_error(errcode);
3042 return JNI_EINVAL;
3043 }
3044 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
3045 // Xmaxf
3046 } else if (match_option(option, "-Xmaxf", &tail)) {
3047 char* err;
3048 int maxf = (int)(strtod(tail, &err) * 100);
3049 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
3050 jio_fprintf(defaultStream::error_stream(),
3051 "Bad max heap free percentage size: %s\n",
3052 option->optionString);
3053 return JNI_EINVAL;
3054 } else {
3055 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
3056 }
3057 // Xminf
3058 } else if (match_option(option, "-Xminf", &tail)) {
3059 char* err;
3060 int minf = (int)(strtod(tail, &err) * 100);
3061 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
3062 jio_fprintf(defaultStream::error_stream(),
3063 "Bad min heap free percentage size: %s\n",
3064 option->optionString);
3065 return JNI_EINVAL;
3066 } else {
3067 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
3068 }
3069 // -Xss
3070 } else if (match_option(option, "-Xss", &tail)) {
3071 julong long_ThreadStackSize = 0;
3072 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
3073 if (errcode != arg_in_range) {
3074 jio_fprintf(defaultStream::error_stream(),
3075 "Invalid thread stack size: %s\n", option->optionString);
3076 describe_range_error(errcode);
3077 return JNI_EINVAL;
3078 }
3079 // Internally track ThreadStackSize in units of 1024 bytes.
3080 FLAG_SET_CMDLINE(intx, ThreadStackSize,
3081 round_to((int)long_ThreadStackSize, K) / K);
3082 // -Xoss
3083 } else if (match_option(option, "-Xoss", &tail)) {
3084 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
3085 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3086 julong long_CodeCacheExpansionSize = 0;
3087 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3088 if (errcode != arg_in_range) {
3089 jio_fprintf(defaultStream::error_stream(),
3090 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3091 os::vm_page_size()/K);
3092 return JNI_EINVAL;
3093 }
3094 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
3095 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3096 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3097 julong long_ReservedCodeCacheSize = 0;
3098
3099 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3100 if (errcode != arg_in_range) {
3101 jio_fprintf(defaultStream::error_stream(),
3102 "Invalid maximum code cache size: %s.\n", option->optionString);
3103 return JNI_EINVAL;
3104 }
3105 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
3106 //-XX:IncreaseFirstTierCompileThresholdAt=
3107 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
3108 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
3109 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
3110 jio_fprintf(defaultStream::error_stream(),
3111 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
3112 option->optionString);
3113 return JNI_EINVAL;
3114 }
3115 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
3116 // -green
3117 } else if (match_option(option, "-green", &tail)) {
3118 jio_fprintf(defaultStream::error_stream(),
3119 "Green threads support not available\n");
3120 return JNI_EINVAL;
3121 // -native
3122 } else if (match_option(option, "-native", &tail)) {
3123 // HotSpot always uses native threads, ignore silently for compatibility
3124 // -Xsqnopause
3125 } else if (match_option(option, "-Xsqnopause", &tail)) {
3126 // EVM option, ignore silently for compatibility
3127 // -Xrs
3128 } else if (match_option(option, "-Xrs", &tail)) {
3129 // Classic/EVM option, new functionality
3130 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3131 } else if (match_option(option, "-Xusealtsigs", &tail)) {
3132 // change default internal VM signals used - lower case for back compat
3133 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3134 // -Xoptimize
3135 } else if (match_option(option, "-Xoptimize", &tail)) {
3136 // EVM option, ignore silently for compatibility
3137 // -Xprof
3138 } else if (match_option(option, "-Xprof", &tail)) {
3139 #if INCLUDE_FPROF
3140 _has_profile = true;
3141 #else // INCLUDE_FPROF
3142 jio_fprintf(defaultStream::error_stream(),
3143 "Flat profiling is not supported in this VM.\n");
3144 return JNI_ERR;
3145 #endif // INCLUDE_FPROF
3146 // -Xconcurrentio
3147 } else if (match_option(option, "-Xconcurrentio", &tail)) {
3148 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3149 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3150 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3151 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3152 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
3153
3154 // -Xinternalversion
3155 } else if (match_option(option, "-Xinternalversion", &tail)) {
3156 jio_fprintf(defaultStream::output_stream(), "%s\n",
3157 VM_Version::internal_vm_info_string());
3158 vm_exit(0);
3159 #ifndef PRODUCT
3160 // -Xprintflags
3161 } else if (match_option(option, "-Xprintflags", &tail)) {
3162 CommandLineFlags::printFlags(tty, false);
3163 vm_exit(0);
3164 #endif
3165 // -D
3166 } else if (match_option(option, "-D", &tail)) {
3167 if (CheckEndorsedAndExtDirs) {
3168 if (match_option(option, "-Djava.endorsed.dirs=", &tail)) {
3169 // abort if -Djava.endorsed.dirs is set
3170 jio_fprintf(defaultStream::output_stream(),
3171 "-Djava.endorsed.dirs will not be supported in a future release.\n"
3172 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3173 return JNI_EINVAL;
3174 }
3175 if (match_option(option, "-Djava.ext.dirs=", &tail)) {
3176 // abort if -Djava.ext.dirs is set
3177 jio_fprintf(defaultStream::output_stream(),
3178 "-Djava.ext.dirs will not be supported in a future release.\n"
3179 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3180 return JNI_EINVAL;
3181 }
3182 }
3183
3184 if (!add_property(tail)) {
3185 return JNI_ENOMEM;
3186 }
3187 // Out of the box management support
3188 if (match_option(option, "-Dcom.sun.management", &tail)) {
3189 #if INCLUDE_MANAGEMENT
3190 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3191 #else
3192 jio_fprintf(defaultStream::output_stream(),
3193 "-Dcom.sun.management is not supported in this VM.\n");
3194 return JNI_ERR;
3195 #endif
3196 }
3197 // -Xint
3198 } else if (match_option(option, "-Xint", &tail)) {
3199 set_mode_flags(_int);
3200 // -Xmixed
3201 } else if (match_option(option, "-Xmixed", &tail)) {
3202 set_mode_flags(_mixed);
3203 // -Xcomp
3204 } else if (match_option(option, "-Xcomp", &tail)) {
3205 // for testing the compiler; turn off all flags that inhibit compilation
3206 set_mode_flags(_comp);
3207 // -Xshare:dump
3208 } else if (match_option(option, "-Xshare:dump", &tail)) {
3209 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3210 set_mode_flags(_int); // Prevent compilation, which creates objects
3211 // -Xshare:on
3212 } else if (match_option(option, "-Xshare:on", &tail)) {
3213 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3214 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3215 // -Xshare:auto
3216 } else if (match_option(option, "-Xshare:auto", &tail)) {
3217 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3218 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3219 // -Xshare:off
3220 } else if (match_option(option, "-Xshare:off", &tail)) {
3221 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3222 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3223 // -Xverify
3224 } else if (match_option(option, "-Xverify", &tail)) {
3225 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3226 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3227 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3228 } else if (strcmp(tail, ":remote") == 0) {
3229 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3230 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3231 } else if (strcmp(tail, ":none") == 0) {
3232 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3233 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3234 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3235 return JNI_EINVAL;
3236 }
3237 // -Xdebug
3238 } else if (match_option(option, "-Xdebug", &tail)) {
3239 // note this flag has been used, then ignore
3240 set_xdebug_mode(true);
3241 // -Xnoagent
3242 } else if (match_option(option, "-Xnoagent", &tail)) {
3243 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3244 } else if (match_option(option, "-Xboundthreads", &tail)) {
3245 // Bind user level threads to kernel threads (Solaris only)
3246 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3247 } else if (match_option(option, "-Xloggc:", &tail)) {
3248 // Redirect GC output to the file. -Xloggc:<filename>
3249 // ostream_init_log(), when called will use this filename
3250 // to initialize a fileStream.
3251 _gc_log_filename = strdup(tail);
3252 if (!is_filename_valid(_gc_log_filename)) {
3253 jio_fprintf(defaultStream::output_stream(),
3254 "Invalid file name for use with -Xloggc: Filename can only contain the "
3255 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3256 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3257 return JNI_EINVAL;
3258 }
3259 FLAG_SET_CMDLINE(bool, PrintGC, true);
3260 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3261
3262 // JNI hooks
3263 } else if (match_option(option, "-Xcheck", &tail)) {
3264 if (!strcmp(tail, ":jni")) {
3265 #if !INCLUDE_JNI_CHECK
3266 warning("JNI CHECKING is not supported in this VM");
3267 #else
3268 CheckJNICalls = true;
3269 #endif // INCLUDE_JNI_CHECK
3270 } else if (is_bad_option(option, args->ignoreUnrecognized,
3271 "check")) {
3272 return JNI_EINVAL;
3273 }
3274 } else if (match_option(option, "vfprintf", &tail)) {
3275 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3276 } else if (match_option(option, "exit", &tail)) {
3277 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3278 } else if (match_option(option, "abort", &tail)) {
3279 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3280 // -XX:+AggressiveHeap
3281 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
3282
3283 // This option inspects the machine and attempts to set various
3284 // parameters to be optimal for long-running, memory allocation
3285 // intensive jobs. It is intended for machines with large
3286 // amounts of cpu and memory.
3287
3288 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3289 // VM, but we may not be able to represent the total physical memory
3290 // available (like having 8gb of memory on a box but using a 32bit VM).
3291 // Thus, we need to make sure we're using a julong for intermediate
3292 // calculations.
3293 julong initHeapSize;
3294 julong total_memory = os::physical_memory();
3295
3296 if (total_memory < (julong)256*M) {
3297 jio_fprintf(defaultStream::error_stream(),
3298 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3299 vm_exit(1);
3300 }
3301
3302 // The heap size is half of available memory, or (at most)
3303 // all of possible memory less 160mb (leaving room for the OS
3304 // when using ISM). This is the maximum; because adaptive sizing
3305 // is turned on below, the actual space used may be smaller.
3306
3307 initHeapSize = MIN2(total_memory / (julong)2,
3308 total_memory - (julong)160*M);
3309
3310 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3311
3312 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3313 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3314 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3315 // Currently the minimum size and the initial heap sizes are the same.
3316 set_min_heap_size(initHeapSize);
3317 }
3318 if (FLAG_IS_DEFAULT(NewSize)) {
3319 // Make the young generation 3/8ths of the total heap.
3320 FLAG_SET_CMDLINE(uintx, NewSize,
3321 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3322 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3323 }
3324
3325 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3326 FLAG_SET_DEFAULT(UseLargePages, true);
3327 #endif
3328
3329 // Increase some data structure sizes for efficiency
3330 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3331 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3332 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3333
3334 // See the OldPLABSize comment below, but replace 'after promotion'
3335 // with 'after copying'. YoungPLABSize is the size of the survivor
3336 // space per-gc-thread buffers. The default is 4kw.
3337 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3338
3339 // OldPLABSize is the size of the buffers in the old gen that
3340 // UseParallelGC uses to promote live data that doesn't fit in the
3341 // survivor spaces. At any given time, there's one for each gc thread.
3342 // The default size is 1kw. These buffers are rarely used, since the
3343 // survivor spaces are usually big enough. For specjbb, however, there
3344 // are occasions when there's lots of live data in the young gen
3345 // and we end up promoting some of it. We don't have a definite
3346 // explanation for why bumping OldPLABSize helps, but the theory
3347 // is that a bigger PLAB results in retaining something like the
3348 // original allocation order after promotion, which improves mutator
3349 // locality. A minor effect may be that larger PLABs reduce the
3350 // number of PLAB allocation events during gc. The value of 8kw
3351 // was arrived at by experimenting with specjbb.
3352 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3353
3354 // Enable parallel GC and adaptive generation sizing
3355 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3356
3357 // Encourage steady state memory management
3358 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3359
3360 // This appears to improve mutator locality
3361 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3362
3363 // Get around early Solaris scheduling bug
3364 // (affinity vs other jobs on system)
3365 // but disallow DR and offlining (5008695).
3366 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3367
3368 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3369 // The last option must always win.
3370 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3371 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3372 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3373 // The last option must always win.
3374 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3375 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3376 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3377 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3378 jio_fprintf(defaultStream::error_stream(),
3379 "Please use CMSClassUnloadingEnabled in place of "
3380 "CMSPermGenSweepingEnabled in the future\n");
3381 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3382 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3383 jio_fprintf(defaultStream::error_stream(),
3384 "Please use -XX:+UseGCOverheadLimit in place of "
3385 "-XX:+UseGCTimeLimit in the future\n");
3386 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3387 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3388 jio_fprintf(defaultStream::error_stream(),
3389 "Please use -XX:-UseGCOverheadLimit in place of "
3390 "-XX:-UseGCTimeLimit in the future\n");
3391 // The TLE options are for compatibility with 1.3 and will be
3392 // removed without notice in a future release. These options
3393 // are not to be documented.
3394 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3395 // No longer used.
3396 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3397 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3398 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3399 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3400 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3401 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3402 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3403 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3404 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3405 // No longer used.
3406 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3407 julong long_tlab_size = 0;
3408 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3409 if (errcode != arg_in_range) {
3410 jio_fprintf(defaultStream::error_stream(),
3411 "Invalid TLAB size: %s\n", option->optionString);
3412 describe_range_error(errcode);
3413 return JNI_EINVAL;
3414 }
3415 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3416 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3417 // No longer used.
3418 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3419 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3420 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3421 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3422 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3423 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3424 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3425 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3426 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3427 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3428 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3429 #if defined(DTRACE_ENABLED)
3430 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3431 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3432 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3433 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3434 #else // defined(DTRACE_ENABLED)
3435 jio_fprintf(defaultStream::error_stream(),
3436 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3437 return JNI_EINVAL;
3438 #endif // defined(DTRACE_ENABLED)
3439 #ifdef ASSERT
3440 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3441 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3442 // disable scavenge before parallel mark-compact
3443 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3444 #endif
3445 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3446 julong cms_blocks_to_claim = (julong)atol(tail);
3447 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3448 jio_fprintf(defaultStream::error_stream(),
3449 "Please use -XX:OldPLABSize in place of "
3450 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3451 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3452 julong cms_blocks_to_claim = (julong)atol(tail);
3453 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3454 jio_fprintf(defaultStream::error_stream(),
3455 "Please use -XX:OldPLABSize in place of "
3456 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3457 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3458 julong old_plab_size = 0;
3459 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3460 if (errcode != arg_in_range) {
3461 jio_fprintf(defaultStream::error_stream(),
3462 "Invalid old PLAB size: %s\n", option->optionString);
3463 describe_range_error(errcode);
3464 return JNI_EINVAL;
3465 }
3466 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3467 jio_fprintf(defaultStream::error_stream(),
3468 "Please use -XX:OldPLABSize in place of "
3469 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3470 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3471 julong young_plab_size = 0;
3472 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3473 if (errcode != arg_in_range) {
3474 jio_fprintf(defaultStream::error_stream(),
3475 "Invalid young PLAB size: %s\n", option->optionString);
3476 describe_range_error(errcode);
3477 return JNI_EINVAL;
3478 }
3479 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3480 jio_fprintf(defaultStream::error_stream(),
3481 "Please use -XX:YoungPLABSize in place of "
3482 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3483 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3484 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3485 julong stack_size = 0;
3486 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3487 if (errcode != arg_in_range) {
3488 jio_fprintf(defaultStream::error_stream(),
3489 "Invalid mark stack size: %s\n", option->optionString);
3490 describe_range_error(errcode);
3491 return JNI_EINVAL;
3492 }
3493 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3494 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3495 julong max_stack_size = 0;
3496 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3497 if (errcode != arg_in_range) {
3498 jio_fprintf(defaultStream::error_stream(),
3499 "Invalid maximum mark stack size: %s\n",
3500 option->optionString);
3501 describe_range_error(errcode);
3502 return JNI_EINVAL;
3503 }
3504 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3505 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3506 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3507 uintx conc_threads = 0;
3508 if (!parse_uintx(tail, &conc_threads, 1)) {
3509 jio_fprintf(defaultStream::error_stream(),
3510 "Invalid concurrent threads: %s\n", option->optionString);
3511 return JNI_EINVAL;
3512 }
3513 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3514 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3515 julong max_direct_memory_size = 0;
3516 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3517 if (errcode != arg_in_range) {
3518 jio_fprintf(defaultStream::error_stream(),
3519 "Invalid maximum direct memory size: %s\n",
3520 option->optionString);
3521 describe_range_error(errcode);
3522 return JNI_EINVAL;
3523 }
3524 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3525 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3526 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3527 // away and will cause VM initialization failures!
3528 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3529 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3530 #if !INCLUDE_MANAGEMENT
3531 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3532 jio_fprintf(defaultStream::error_stream(),
3533 "ManagementServer is not supported in this VM.\n");
3534 return JNI_ERR;
3535 #endif // INCLUDE_MANAGEMENT
3536 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3537 // Skip -XX:Flags= since that case has already been handled
3538 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3539 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3540 return JNI_EINVAL;
3541 }
3542 }
3543 // Unknown option
3544 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3545 return JNI_ERR;
3546 }
3547 }
3548
3549 // PrintSharedArchiveAndExit will turn on
3550 // -Xshare:on
3551 // -XX:+TraceClassPaths
3552 if (PrintSharedArchiveAndExit) {
3553 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3554 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3555 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3556 }
3557
3558 // Change the default value for flags which have different default values
3559 // when working with older JDKs.
3560 #ifdef LINUX
3561 if (JDK_Version::current().compare_major(6) <= 0 &&
3562 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3563 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3564 }
3565 #endif // LINUX
3566 fix_appclasspath();
3567 return JNI_OK;
3568 }
3569
3570 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3571 //
3572 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3573 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3574 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3575 // path is treated as the current directory.
3576 //
3577 // This causes problems with CDS, which requires that all directories specified in the classpath
3578 // must be empty. In most cases, applications do NOT want to load classes from the current
3579 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3580 // scripts compatible with CDS.
3581 void Arguments::fix_appclasspath() {
3582 if (IgnoreEmptyClassPaths) {
3583 const char separator = *os::path_separator();
3584 const char* src = _java_class_path->value();
3585
3586 // skip over all the leading empty paths
3587 while (*src == separator) {
3588 src ++;
3589 }
3590
3591 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3592 strncpy(copy, src, strlen(src) + 1);
3593
3594 // trim all trailing empty paths
3595 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3596 *tail = '\0';
3597 }
3598
3599 char from[3] = {separator, separator, '\0'};
3600 char to [2] = {separator, '\0'};
3601 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3602 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3603 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3604 }
3605
3606 _java_class_path->set_value(copy);
3607 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3608 }
3609
3610 if (!PrintSharedArchiveAndExit) {
3611 ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
3612 }
3613 }
3614
3615 static bool has_jar_files(const char* directory) {
3616 DIR* dir = os::opendir(directory);
3617 if (dir == NULL) return false;
3618
3619 struct dirent *entry;
3620 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3621 bool hasJarFile = false;
3622 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3623 const char* name = entry->d_name;
3624 const char* ext = name + strlen(name) - 4;
3625 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3626 }
3627 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
3628 os::closedir(dir);
3629 return hasJarFile ;
3630 }
3631
3632 // returns the number of directories in the given path containing JAR files
3633 // If the skip argument is not NULL, it will skip that directory
3634 static int check_non_empty_dirs(const char* path, const char* type, const char* skip) {
3635 const char separator = *os::path_separator();
3636 const char* const end = path + strlen(path);
3637 int nonEmptyDirs = 0;
3638 while (path < end) {
3639 const char* tmp_end = strchr(path, separator);
3640 if (tmp_end == NULL) {
3641 if ((skip == NULL || strcmp(path, skip) != 0) && has_jar_files(path)) {
3642 nonEmptyDirs++;
3643 jio_fprintf(defaultStream::output_stream(),
3644 "Non-empty %s directory: %s\n", type, path);
3645 }
3646 path = end;
3647 } else {
3648 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3649 memcpy(dirpath, path, tmp_end - path);
3650 dirpath[tmp_end - path] = '\0';
3651 if ((skip == NULL || strcmp(dirpath, skip) != 0) && has_jar_files(dirpath)) {
3652 nonEmptyDirs++;
3653 jio_fprintf(defaultStream::output_stream(),
3654 "Non-empty %s directory: %s\n", type, dirpath);
3655 }
3656 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
3657 path = tmp_end + 1;
3658 }
3659 }
3660 return nonEmptyDirs;
3661 }
3662
3663 // Returns true if endorsed standards override mechanism and extension mechanism
3664 // are not used.
3665 static bool check_endorsed_and_ext_dirs() {
3666 if (!CheckEndorsedAndExtDirs)
3667 return true;
3668
3669 char endorsedDir[JVM_MAXPATHLEN];
3670 char extDir[JVM_MAXPATHLEN];
3671 const char* fileSep = os::file_separator();
3672 jio_snprintf(endorsedDir, sizeof(endorsedDir), "%s%slib%sendorsed",
3673 Arguments::get_java_home(), fileSep, fileSep);
3674 jio_snprintf(extDir, sizeof(extDir), "%s%slib%sext",
3675 Arguments::get_java_home(), fileSep, fileSep);
3676
3677 // check endorsed directory
3678 int nonEmptyDirs = check_non_empty_dirs(Arguments::get_endorsed_dir(), "endorsed", NULL);
3679
3680 // check the extension directories but skip the default lib/ext directory
3681 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs(), "extension", extDir);
3682
3683 // List of JAR files installed in the default lib/ext directory.
3684 // -XX:+CheckEndorsedAndExtDirs checks if any non-JDK file installed
3685 static const char* jdk_ext_jars[] = {
3686 "access-bridge-32.jar",
3687 "access-bridge-64.jar",
3688 "access-bridge.jar",
3689 "cldrdata.jar",
3690 "dnsns.jar",
3691 "jaccess.jar",
3692 "jfxrt.jar",
3693 "localedata.jar",
3694 "nashorn.jar",
3695 "sunec.jar",
3696 "sunjce_provider.jar",
3697 "sunmscapi.jar",
3698 "sunpkcs11.jar",
3699 "ucrypto.jar",
3700 "zipfs.jar",
3701 NULL
3702 };
3703
3704 // check if the default lib/ext directory has any non-JDK jar files; if so, error
3705 DIR* dir = os::opendir(extDir);
3706 if (dir != NULL) {
3707 int num_ext_jars = 0;
3708 struct dirent *entry;
3709 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(extDir), mtInternal);
3710 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3711 const char* name = entry->d_name;
3712 const char* ext = name + strlen(name) - 4;
3713 if (ext > name && (os::file_name_strcmp(ext, ".jar") == 0)) {
3714 bool is_jdk_jar = false;
3715 const char* jarfile = NULL;
3716 for (int i=0; (jarfile = jdk_ext_jars[i]) != NULL; i++) {
3717 if (os::file_name_strcmp(name, jarfile) == 0) {
3718 is_jdk_jar = true;
3719 break;
3720 }
3721 }
3722 if (!is_jdk_jar) {
3723 jio_fprintf(defaultStream::output_stream(),
3724 "%s installed in <JAVA_HOME>/lib/ext\n", name);
3725 num_ext_jars++;
3726 }
3727 }
3728 }
3729 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
3730 os::closedir(dir);
3731 if (num_ext_jars > 0) {
3732 nonEmptyDirs += 1;
3733 }
3734 }
3735
3736 // check if the default lib/endorsed directory exists; if so, error
3737 dir = os::opendir(endorsedDir);
3738 if (dir != NULL) {
3739 jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed exists\n");
3740 os::closedir(dir);
3741 nonEmptyDirs += 1;
3742 }
3743
3744 if (nonEmptyDirs > 0) {
3745 jio_fprintf(defaultStream::output_stream(),
3746 "Endorsed standards override mechanism and extension mechanism "
3747 "will not be supported in a future release.\n"
3748 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3749 return false;
3750 }
3751
3752 return true;
3753 }
3754
3755 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3756 // This must be done after all -D arguments have been processed.
3757 scp_p->expand_endorsed();
3758
3759 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3760 // Assemble the bootclasspath elements into the final path.
3761 Arguments::set_sysclasspath(scp_p->combined_path());
3762 }
3763
3764 if (!check_endorsed_and_ext_dirs()) {
3765 return JNI_ERR;
3766 }
3767
3768 // This must be done after all arguments have been processed.
3769 // java_compiler() true means set to "NONE" or empty.
3770 if (java_compiler() && !xdebug_mode()) {
3771 // For backwards compatibility, we switch to interpreted mode if
3772 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3773 // not specified.
3774 set_mode_flags(_int);
3775 }
3776 if (CompileThreshold == 0) {
3777 set_mode_flags(_int);
3778 }
3779
3780 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3781 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3782 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3783 }
3784
3785 #ifndef COMPILER2
3786 // Don't degrade server performance for footprint
3787 if (FLAG_IS_DEFAULT(UseLargePages) &&
3788 MaxHeapSize < LargePageHeapSizeThreshold) {
3789 // No need for large granularity pages w/small heaps.
3790 // Note that large pages are enabled/disabled for both the
3791 // Java heap and the code cache.
3792 FLAG_SET_DEFAULT(UseLargePages, false);
3793 }
3794
3795 #else
3796 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3797 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3798 }
3799 #endif
3800
3801 #ifndef TIERED
3802 // Tiered compilation is undefined.
3803 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3804 #endif
3805
3806 // If we are running in a headless jre, force java.awt.headless property
3807 // to be true unless the property has already been set.
3808 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3809 if (os::is_headless_jre()) {
3810 const char* headless = Arguments::get_property("java.awt.headless");
3811 if (headless == NULL) {
3812 char envbuffer[128];
3813 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3814 if (!add_property("java.awt.headless=true")) {
3815 return JNI_ENOMEM;
3816 }
3817 } else {
3818 char buffer[256];
3819 jio_snprintf(buffer, 256, "java.awt.headless=%s", envbuffer);
3820 if (!add_property(buffer)) {
3821 return JNI_ENOMEM;
3822 }
3823 }
3824 }
3825 }
3826
3827 if (!check_vm_args_consistency()) {
3828 return JNI_ERR;
3829 }
3830
3831 return JNI_OK;
3832 }
3833
3834 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3835 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3836 scp_assembly_required_p);
3837 }
3838
3839 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3840 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3841 scp_assembly_required_p);
3842 }
3843
3844 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3845 const int N_MAX_OPTIONS = 64;
3846 const int OPTION_BUFFER_SIZE = 1024;
3847 char buffer[OPTION_BUFFER_SIZE];
3848
3849 // The variable will be ignored if it exceeds the length of the buffer.
3850 // Don't check this variable if user has special privileges
3851 // (e.g. unix su command).
3852 if (os::getenv(name, buffer, sizeof(buffer)) &&
3853 !os::have_special_privileges()) {
3854 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3855 jio_fprintf(defaultStream::error_stream(),
3856 "Picked up %s: %s\n", name, buffer);
3857 char* rd = buffer; // pointer to the input string (rd)
3858 int i;
3859 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3860 while (isspace(*rd)) rd++; // skip whitespace
3861 if (*rd == 0) break; // we re done when the input string is read completely
3862
3863 // The output, option string, overwrites the input string.
3864 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3865 // input string (rd).
3866 char* wrt = rd;
3867
3868 options[i++].optionString = wrt; // Fill in option
3869 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3870 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3871 int quote = *rd; // matching quote to look for
3872 rd++; // don't copy open quote
3873 while (*rd != quote) { // include everything (even spaces) up until quote
3874 if (*rd == 0) { // string termination means unmatched string
3875 jio_fprintf(defaultStream::error_stream(),
3876 "Unmatched quote in %s\n", name);
3877 return JNI_ERR;
3878 }
3879 *wrt++ = *rd++; // copy to option string
3880 }
3881 rd++; // don't copy close quote
3882 } else {
3883 *wrt++ = *rd++; // copy to option string
3884 }
3885 }
3886 // Need to check if we're done before writing a NULL,
3887 // because the write could be to the byte that rd is pointing to.
3888 if (*rd++ == 0) {
3889 *wrt = 0;
3890 break;
3891 }
3892 *wrt = 0; // Zero terminate option
3893 }
3894 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3895 JavaVMInitArgs vm_args;
3896 vm_args.version = JNI_VERSION_1_2;
3897 vm_args.options = options;
3898 vm_args.nOptions = i;
3899 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3900
3901 if (PrintVMOptions) {
3902 const char* tail;
3903 for (int i = 0; i < vm_args.nOptions; i++) {
3904 const JavaVMOption *option = vm_args.options + i;
3905 if (match_option(option, "-XX:", &tail)) {
3906 logOption(tail);
3907 }
3908 }
3909 }
3910
3911 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3912 }
3913 return JNI_OK;
3914 }
3915
3916 void Arguments::set_shared_spaces_flags() {
3917 if (DumpSharedSpaces) {
3918 if (FailOverToOldVerifier) {
3919 // Don't fall back to the old verifier on verification failure. If a
3920 // class fails verification with the split verifier, it might fail the
3921 // CDS runtime verifier constraint check. In that case, we don't want
3922 // to share the class. We only archive classes that pass the split verifier.
3923 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
3924 }
3925
3926 if (RequireSharedSpaces) {
3927 warning("cannot dump shared archive while using shared archive");
3928 }
3929 UseSharedSpaces = false;
3930 #ifdef _LP64
3931 if (!UseCompressedOops || !UseCompressedClassPointers) {
3932 vm_exit_during_initialization(
3933 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3934 }
3935 } else {
3936 if (!UseCompressedOops || !UseCompressedClassPointers) {
3937 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3938 }
3939 #endif
3940 }
3941 }
3942
3943 #if !INCLUDE_ALL_GCS
3944 static void force_serial_gc() {
3945 FLAG_SET_DEFAULT(UseSerialGC, true);
3946 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3947 UNSUPPORTED_GC_OPTION(UseG1GC);
3948 UNSUPPORTED_GC_OPTION(UseParallelGC);
3949 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3950 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3951 UNSUPPORTED_GC_OPTION(UseParNewGC);
3952 }
3953 #endif // INCLUDE_ALL_GCS
3954
3955 // Sharing support
3956 // Construct the path to the archive
3957 static char* get_shared_archive_path() {
3958 char *shared_archive_path;
3959 if (SharedArchiveFile == NULL) {
3960 char jvm_path[JVM_MAXPATHLEN];
3961 os::jvm_path(jvm_path, sizeof(jvm_path));
3962 char *end = strrchr(jvm_path, *os::file_separator());
3963 if (end != NULL) *end = '\0';
3964 size_t jvm_path_len = strlen(jvm_path);
3965 size_t file_sep_len = strlen(os::file_separator());
3966 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3967 file_sep_len + 20, mtInternal);
3968 if (shared_archive_path != NULL) {
3969 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3970 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3971 strncat(shared_archive_path, "classes.jsa", 11);
3972 }
3973 } else {
3974 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3975 if (shared_archive_path != NULL) {
3976 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3977 }
3978 }
3979 return shared_archive_path;
3980 }
3981
3982 #ifndef PRODUCT
3983 // Determine whether LogVMOutput should be implicitly turned on.
3984 static bool use_vm_log() {
3985 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3986 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3987 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3988 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3989 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3990 return true;
3991 }
3992
3993 #ifdef COMPILER1
3994 if (PrintC1Statistics) {
3995 return true;
3996 }
3997 #endif // COMPILER1
3998
3999 #ifdef COMPILER2
4000 if (PrintOptoAssembly || PrintOptoStatistics) {
4001 return true;
4002 }
4003 #endif // COMPILER2
4004
4005 return false;
4006 }
4007 #endif // PRODUCT
4008
4009 // Parse entry point called from JNI_CreateJavaVM
4010
4011 jint Arguments::parse(const JavaVMInitArgs* args) {
4012
4013 // Remaining part of option string
4014 const char* tail;
4015
4016 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4017 const char* hotspotrc = ".hotspotrc";
4018 bool settings_file_specified = false;
4019 bool needs_hotspotrc_warning = false;
4020
4021 ArgumentsExt::process_options(args);
4022
4023 const char* flags_file;
4024 int index;
4025 for (index = 0; index < args->nOptions; index++) {
4026 const JavaVMOption *option = args->options + index;
4027 if (match_option(option, "-XX:Flags=", &tail)) {
4028 flags_file = tail;
4029 settings_file_specified = true;
4030 }
4031 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
4032 PrintVMOptions = true;
4033 }
4034 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
4035 PrintVMOptions = false;
4036 }
4037 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
4038 IgnoreUnrecognizedVMOptions = true;
4039 }
4040 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
4041 IgnoreUnrecognizedVMOptions = false;
4042 }
4043 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
4044 CommandLineFlags::printFlags(tty, false);
4045 vm_exit(0);
4046 }
4047 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4048 #if INCLUDE_NMT
4049 // The launcher did not setup nmt environment variable properly.
4050 if (!MemTracker::check_launcher_nmt_support(tail)) {
4051 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4052 }
4053
4054 // Verify if nmt option is valid.
4055 if (MemTracker::verify_nmt_option()) {
4056 // Late initialization, still in single-threaded mode.
4057 if (MemTracker::tracking_level() >= NMT_summary) {
4058 MemTracker::init();
4059 }
4060 } else {
4061 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4062 }
4063 #else
4064 jio_fprintf(defaultStream::error_stream(),
4065 "Native Memory Tracking is not supported in this VM\n");
4066 return JNI_ERR;
4067 #endif
4068 }
4069
4070
4071 #ifndef PRODUCT
4072 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
4073 CommandLineFlags::printFlags(tty, true);
4074 vm_exit(0);
4075 }
4076 #endif
4077 }
4078
4079 if (IgnoreUnrecognizedVMOptions) {
4080 // uncast const to modify the flag args->ignoreUnrecognized
4081 *(jboolean*)(&args->ignoreUnrecognized) = true;
4082 }
4083
4084 // Parse specified settings file
4085 if (settings_file_specified) {
4086 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
4087 return JNI_EINVAL;
4088 }
4089 } else {
4090 #ifdef ASSERT
4091 // Parse default .hotspotrc settings file
4092 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
4093 return JNI_EINVAL;
4094 }
4095 #else
4096 struct stat buf;
4097 if (os::stat(hotspotrc, &buf) == 0) {
4098 needs_hotspotrc_warning = true;
4099 }
4100 #endif
4101 }
4102
4103 if (PrintVMOptions) {
4104 for (index = 0; index < args->nOptions; index++) {
4105 const JavaVMOption *option = args->options + index;
4106 if (match_option(option, "-XX:", &tail)) {
4107 logOption(tail);
4108 }
4109 }
4110 }
4111
4112 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4113 jint result = parse_vm_init_args(args);
4114 if (result != JNI_OK) {
4115 return result;
4116 }
4117
4118 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4119 SharedArchivePath = get_shared_archive_path();
4120 if (SharedArchivePath == NULL) {
4121 return JNI_ENOMEM;
4122 }
4123
4124 // Set up VerifySharedSpaces
4125 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4126 VerifySharedSpaces = true;
4127 }
4128
4129 // Delay warning until here so that we've had a chance to process
4130 // the -XX:-PrintWarnings flag
4131 if (needs_hotspotrc_warning) {
4132 warning("%s file is present but has been ignored. "
4133 "Run with -XX:Flags=%s to load the file.",
4134 hotspotrc, hotspotrc);
4135 }
4136
4137 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
4138 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4139 #endif
4140
4141 #if INCLUDE_ALL_GCS
4142 #if (defined JAVASE_EMBEDDED || defined ARM)
4143 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
4144 #endif
4145 #endif
4146
4147 #ifndef PRODUCT
4148 if (TraceBytecodesAt != 0) {
4149 TraceBytecodes = true;
4150 }
4151 if (CountCompiledCalls) {
4152 if (UseCounterDecay) {
4153 warning("UseCounterDecay disabled because CountCalls is set");
4154 UseCounterDecay = false;
4155 }
4156 }
4157 #endif // PRODUCT
4158
4159 // JSR 292 is not supported before 1.7
4160 if (!JDK_Version::is_gte_jdk17x_version()) {
4161 if (EnableInvokeDynamic) {
4162 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
4163 warning("JSR 292 is not supported before 1.7. Disabling support.");
4164 }
4165 EnableInvokeDynamic = false;
4166 }
4167 }
4168
4169 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
4170 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4171 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
4172 }
4173 ScavengeRootsInCode = 1;
4174 }
4175
4176 if (PrintGCDetails) {
4177 // Turn on -verbose:gc options as well
4178 PrintGC = true;
4179 }
4180
4181 if (!JDK_Version::is_gte_jdk18x_version()) {
4182 // To avoid changing the log format for 7 updates this flag is only
4183 // true by default in JDK8 and above.
4184 if (FLAG_IS_DEFAULT(PrintGCCause)) {
4185 FLAG_SET_DEFAULT(PrintGCCause, false);
4186 }
4187 }
4188
4189 // Set object alignment values.
4190 set_object_alignment();
4191
4192 #if !INCLUDE_ALL_GCS
4193 force_serial_gc();
4194 #endif // INCLUDE_ALL_GCS
4195 #if !INCLUDE_CDS
4196 if (DumpSharedSpaces || RequireSharedSpaces) {
4197 jio_fprintf(defaultStream::error_stream(),
4198 "Shared spaces are not supported in this VM\n");
4199 return JNI_ERR;
4200 }
4201 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4202 warning("Shared spaces are not supported in this VM");
4203 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4204 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4205 }
4206 no_shared_spaces("CDS Disabled");
4207 #endif // INCLUDE_CDS
4208
4209 return JNI_OK;
4210 }
4211
4212 jint Arguments::apply_ergo() {
4213
4214 // Set flags based on ergonomics.
4215 set_ergonomics_flags();
4216
4217 set_shared_spaces_flags();
4218
4219 #if defined(SPARC)
4220 // BIS instructions require 'membar' instruction regardless of the number
4221 // of CPUs because in virtualized/container environments which might use only 1
4222 // CPU, BIS instructions may produce incorrect results.
4223
4224 if (FLAG_IS_DEFAULT(AssumeMP)) {
4225 FLAG_SET_DEFAULT(AssumeMP, true);
4226 }
4227 #endif
4228
4229 // Check the GC selections again.
4230 if (!check_gc_consistency()) {
4231 return JNI_EINVAL;
4232 }
4233
4234 if (TieredCompilation) {
4235 set_tiered_flags();
4236 } else {
4237 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
4238 if (CompilationPolicyChoice >= 2) {
4239 vm_exit_during_initialization(
4240 "Incompatible compilation policy selected", NULL);
4241 }
4242 }
4243 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
4244 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4245 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
4246 }
4247
4248
4249 // Set heap size based on available physical memory
4250 set_heap_size();
4251
4252 ArgumentsExt::set_gc_specific_flags();
4253
4254 // Initialize Metaspace flags and alignments.
4255 Metaspace::ergo_initialize();
4256
4257 // Set bytecode rewriting flags
4258 set_bytecode_flags();
4259
4260 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
4261 set_aggressive_opts_flags();
4262
4263 // Turn off biased locking for locking debug mode flags,
4264 // which are subtlely different from each other but neither works with
4265 // biased locking.
4266 if (UseHeavyMonitors
4267 #ifdef COMPILER1
4268 || !UseFastLocking
4269 #endif // COMPILER1
4270 ) {
4271 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4272 // flag set to true on command line; warn the user that they
4273 // can't enable biased locking here
4274 warning("Biased Locking is not supported with locking debug flags"
4275 "; ignoring UseBiasedLocking flag." );
4276 }
4277 UseBiasedLocking = false;
4278 }
4279
4280 #ifdef ZERO
4281 // Clear flags not supported on zero.
4282 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4283 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4284 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4285 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4286 #endif // CC_INTERP
4287
4288 #ifdef COMPILER2
4289 if (!EliminateLocks) {
4290 EliminateNestedLocks = false;
4291 }
4292 if (!Inline) {
4293 IncrementalInline = false;
4294 }
4295 #ifndef PRODUCT
4296 if (!IncrementalInline) {
4297 AlwaysIncrementalInline = false;
4298 }
4299 #endif
4300 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
4301 // incremental inlining: bump MaxNodeLimit
4302 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
4303 }
4304 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4305 // nothing to use the profiling, turn if off
4306 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4307 }
4308 #endif
4309
4310 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4311 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4312 DebugNonSafepoints = true;
4313 }
4314
4315 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4316 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4317 }
4318
4319 if (UseOnStackReplacement && !UseLoopCounter) {
4320 warning("On-stack-replacement requires loop counters; enabling loop counters");
4321 FLAG_SET_DEFAULT(UseLoopCounter, true);
4322 }
4323
4324 #ifndef PRODUCT
4325 if (CompileTheWorld) {
4326 // Force NmethodSweeper to sweep whole CodeCache each time.
4327 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4328 NmethodSweepFraction = 1;
4329 }
4330 }
4331
4332 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4333 if (use_vm_log()) {
4334 LogVMOutput = true;
4335 }
4336 }
4337 #endif // PRODUCT
4338
4339 if (PrintCommandLineFlags) {
4340 CommandLineFlags::printSetFlags(tty);
4341 }
4342
4343 // Apply CPU specific policy for the BiasedLocking
4344 if (UseBiasedLocking) {
4345 if (!VM_Version::use_biased_locking() &&
4346 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4347 UseBiasedLocking = false;
4348 }
4349 }
4350 #ifdef COMPILER2
4351 if (!UseBiasedLocking || EmitSync != 0) {
4352 UseOptoBiasInlining = false;
4353 }
4354 #endif
4355
4356 // set PauseAtExit if the gamma launcher was used and a debugger is attached
4357 // but only if not already set on the commandline
4358 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
4359 bool set = false;
4360 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
4361 if (!set) {
4362 FLAG_SET_DEFAULT(PauseAtExit, true);
4363 }
4364 }
4365
4366 return JNI_OK;
4367 }
4368
4369 jint Arguments::adjust_after_os() {
4370 if (UseNUMA) {
4371 if (UseParallelGC || UseParallelOldGC) {
4372 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4373 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4374 }
4375 }
4376 // UseNUMAInterleaving is set to ON for all collectors and
4377 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4378 // such as the parallel collector for Linux and Solaris will
4379 // interleave old gen and survivor spaces on top of NUMA
4380 // allocation policy for the eden space.
4381 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4382 // all platforms and ParallelGC on Windows will interleave all
4383 // of the heap spaces across NUMA nodes.
4384 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4385 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4386 }
4387 }
4388 return JNI_OK;
4389 }
4390
4391 int Arguments::PropertyList_count(SystemProperty* pl) {
4392 int count = 0;
4393 while(pl != NULL) {
4394 count++;
4395 pl = pl->next();
4396 }
4397 return count;
4398 }
4399
4400 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4401 assert(key != NULL, "just checking");
4402 SystemProperty* prop;
4403 for (prop = pl; prop != NULL; prop = prop->next()) {
4404 if (strcmp(key, prop->key()) == 0) return prop->value();
4405 }
4406 return NULL;
4407 }
4408
4409 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4410 int count = 0;
4411 const char* ret_val = NULL;
4412
4413 while(pl != NULL) {
4414 if(count >= index) {
4415 ret_val = pl->key();
4416 break;
4417 }
4418 count++;
4419 pl = pl->next();
4420 }
4421
4422 return ret_val;
4423 }
4424
4425 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4426 int count = 0;
4427 char* ret_val = NULL;
4428
4429 while(pl != NULL) {
4430 if(count >= index) {
4431 ret_val = pl->value();
4432 break;
4433 }
4434 count++;
4435 pl = pl->next();
4436 }
4437
4438 return ret_val;
4439 }
4440
4441 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4442 SystemProperty* p = *plist;
4443 if (p == NULL) {
4444 *plist = new_p;
4445 } else {
4446 while (p->next() != NULL) {
4447 p = p->next();
4448 }
4449 p->set_next(new_p);
4450 }
4451 }
4452
4453 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4454 if (plist == NULL)
4455 return;
4456
4457 SystemProperty* new_p = new SystemProperty(k, v, true);
4458 PropertyList_add(plist, new_p);
4459 }
4460
4461 // This add maintains unique property key in the list.
4462 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4463 if (plist == NULL)
4464 return;
4465
4466 // If property key exist then update with new value.
4467 SystemProperty* prop;
4468 for (prop = *plist; prop != NULL; prop = prop->next()) {
4469 if (strcmp(k, prop->key()) == 0) {
4470 if (append) {
4471 prop->append_value(v);
4472 } else {
4473 prop->set_value(v);
4474 }
4475 return;
4476 }
4477 }
4478
4479 PropertyList_add(plist, k, v);
4480 }
4481
4482 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4483 // Returns true if all of the source pointed by src has been copied over to
4484 // the destination buffer pointed by buf. Otherwise, returns false.
4485 // Notes:
4486 // 1. If the length (buflen) of the destination buffer excluding the
4487 // NULL terminator character is not long enough for holding the expanded
4488 // pid characters, it also returns false instead of returning the partially
4489 // expanded one.
4490 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4491 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4492 char* buf, size_t buflen) {
4493 const char* p = src;
4494 char* b = buf;
4495 const char* src_end = &src[srclen];
4496 char* buf_end = &buf[buflen - 1];
4497
4498 while (p < src_end && b < buf_end) {
4499 if (*p == '%') {
4500 switch (*(++p)) {
4501 case '%': // "%%" ==> "%"
4502 *b++ = *p++;
4503 break;
4504 case 'p': { // "%p" ==> current process id
4505 // buf_end points to the character before the last character so
4506 // that we could write '\0' to the end of the buffer.
4507 size_t buf_sz = buf_end - b + 1;
4508 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4509
4510 // if jio_snprintf fails or the buffer is not long enough to hold
4511 // the expanded pid, returns false.
4512 if (ret < 0 || ret >= (int)buf_sz) {
4513 return false;
4514 } else {
4515 b += ret;
4516 assert(*b == '\0', "fail in copy_expand_pid");
4517 if (p == src_end && b == buf_end + 1) {
4518 // reach the end of the buffer.
4519 return true;
4520 }
4521 }
4522 p++;
4523 break;
4524 }
4525 default :
4526 *b++ = '%';
4527 }
4528 } else {
4529 *b++ = *p++;
4530 }
4531 }
4532 *b = '\0';
4533 return (p == src_end); // return false if not all of the source was copied
4534 }