1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "compiler/compilerOracle.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/cardTableRS.hpp"
32 #include "memory/genCollectedHeap.hpp"
33 #include "memory/referenceProcessor.hpp"
34 #include "memory/universe.inline.hpp"
35 #include "oops/oop.inline.hpp"
36 #include "prims/jvmtiExport.hpp"
37 #include "runtime/arguments.hpp"
38 #include "runtime/arguments_ext.hpp"
39 #include "runtime/globals_extension.hpp"
40 #include "runtime/java.hpp"
41 #include "services/management.hpp"
42 #include "services/memTracker.hpp"
43 #include "utilities/defaultStream.hpp"
44 #include "utilities/macros.hpp"
45 #include "utilities/stringUtils.hpp"
46 #include "utilities/taskqueue.hpp"
47 #ifdef TARGET_OS_FAMILY_linux
48 # include "os_linux.inline.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_solaris
51 # include "os_solaris.inline.hpp"
52 #endif
53 #ifdef TARGET_OS_FAMILY_windows
54 # include "os_windows.inline.hpp"
55 #endif
56 #ifdef TARGET_OS_FAMILY_aix
57 # include "os_aix.inline.hpp"
58 #endif
59 #ifdef TARGET_OS_FAMILY_bsd
60 # include "os_bsd.inline.hpp"
61 #endif
62 #if INCLUDE_ALL_GCS
63 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
64 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
65 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
66 #include "gc_implementation/shenandoah/shenandoahHeap.hpp"
67 #include "gc_implementation/shenandoah/shenandoahLogging.hpp"
68 #include "gc_implementation/shenandoah/shenandoahHeapRegion.hpp"
69 #endif // INCLUDE_ALL_GCS
70
71 // Note: This is a special bug reporting site for the JVM
72 #ifdef VENDOR_URL_VM_BUG
73 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG
74 #else
75 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
76 #endif
77 #define DEFAULT_JAVA_LAUNCHER "generic"
78
79 // Disable options not supported in this release, with a warning if they
80 // were explicitly requested on the command-line
81 #define UNSUPPORTED_OPTION(opt, description) \
82 do { \
83 if (opt) { \
84 if (FLAG_IS_CMDLINE(opt)) { \
85 warning(description " is disabled in this release."); \
86 } \
87 FLAG_SET_DEFAULT(opt, false); \
88 } \
89 } while(0)
90
91 #define UNSUPPORTED_GC_OPTION(gc) \
92 do { \
93 if (gc) { \
94 if (FLAG_IS_CMDLINE(gc)) { \
95 warning(#gc " is not supported in this VM. Using Serial GC."); \
96 } \
97 FLAG_SET_DEFAULT(gc, false); \
98 } \
99 } while(0)
100
101 char** Arguments::_jvm_flags_array = NULL;
102 int Arguments::_num_jvm_flags = 0;
103 char** Arguments::_jvm_args_array = NULL;
104 int Arguments::_num_jvm_args = 0;
105 char* Arguments::_java_command = NULL;
106 SystemProperty* Arguments::_system_properties = NULL;
107 const char* Arguments::_gc_log_filename = NULL;
108 bool Arguments::_has_profile = false;
109 size_t Arguments::_conservative_max_heap_alignment = 0;
110 uintx Arguments::_min_heap_size = 0;
111 uintx Arguments::_min_heap_free_ratio = 0;
112 uintx Arguments::_max_heap_free_ratio = 0;
113 Arguments::Mode Arguments::_mode = _mixed;
114 bool Arguments::_java_compiler = false;
115 bool Arguments::_xdebug_mode = false;
116 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
117 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
118 int Arguments::_sun_java_launcher_pid = -1;
119 bool Arguments::_created_by_gamma_launcher = false;
120
121 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
122 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
123 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
124 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
125 bool Arguments::_ClipInlining = ClipInlining;
126
127 char* Arguments::SharedArchivePath = NULL;
128
129 AgentLibraryList Arguments::_libraryList;
130 AgentLibraryList Arguments::_agentList;
131
132 abort_hook_t Arguments::_abort_hook = NULL;
133 exit_hook_t Arguments::_exit_hook = NULL;
134 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
135
136
137 SystemProperty *Arguments::_java_ext_dirs = NULL;
138 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
139 SystemProperty *Arguments::_sun_boot_library_path = NULL;
140 SystemProperty *Arguments::_java_library_path = NULL;
141 SystemProperty *Arguments::_java_home = NULL;
142 SystemProperty *Arguments::_java_class_path = NULL;
143 SystemProperty *Arguments::_sun_boot_class_path = NULL;
144
145 char* Arguments::_meta_index_path = NULL;
146 char* Arguments::_meta_index_dir = NULL;
147
148 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
149
150 static bool match_option(const JavaVMOption *option, const char* name,
151 const char** tail) {
152 int len = (int)strlen(name);
153 if (strncmp(option->optionString, name, len) == 0) {
154 *tail = option->optionString + len;
155 return true;
156 } else {
157 return false;
158 }
159 }
160
161 static void logOption(const char* opt) {
162 if (PrintVMOptions) {
163 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
164 }
165 }
166
167 // Process java launcher properties.
168 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
169 // See if sun.java.launcher or sun.java.launcher.pid is defined.
170 // Must do this before setting up other system properties,
171 // as some of them may depend on launcher type.
172 for (int index = 0; index < args->nOptions; index++) {
173 const JavaVMOption* option = args->options + index;
174 const char* tail;
175
176 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
177 process_java_launcher_argument(tail, option->extraInfo);
178 continue;
179 }
180 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
181 _sun_java_launcher_pid = atoi(tail);
182 continue;
183 }
184 }
185 }
186
187 // Initialize system properties key and value.
188 void Arguments::init_system_properties() {
189
190 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
191 "Java Virtual Machine Specification", false));
192 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
193 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
194 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
195
196 // following are JVMTI agent writeable properties.
197 // Properties values are set to NULL and they are
198 // os specific they are initialized in os::init_system_properties_values().
199 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
200 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
201 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
202 _java_library_path = new SystemProperty("java.library.path", NULL, true);
203 _java_home = new SystemProperty("java.home", NULL, true);
204 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
205
206 _java_class_path = new SystemProperty("java.class.path", "", true);
207
208 // Add to System Property list.
209 PropertyList_add(&_system_properties, _java_ext_dirs);
210 PropertyList_add(&_system_properties, _java_endorsed_dirs);
211 PropertyList_add(&_system_properties, _sun_boot_library_path);
212 PropertyList_add(&_system_properties, _java_library_path);
213 PropertyList_add(&_system_properties, _java_home);
214 PropertyList_add(&_system_properties, _java_class_path);
215 PropertyList_add(&_system_properties, _sun_boot_class_path);
216
217 // Set OS specific system properties values
218 os::init_system_properties_values();
219 }
220
221
222 // Update/Initialize System properties after JDK version number is known
223 void Arguments::init_version_specific_system_properties() {
224 enum { bufsz = 16 };
225 char buffer[bufsz];
226 const char* spec_vendor = "Sun Microsystems Inc.";
227 uint32_t spec_version = 0;
228
229 if (JDK_Version::is_gte_jdk17x_version()) {
230 spec_vendor = "Oracle Corporation";
231 spec_version = JDK_Version::current().major_version();
232 }
233 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
234
235 PropertyList_add(&_system_properties,
236 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
237 PropertyList_add(&_system_properties,
238 new SystemProperty("java.vm.specification.version", buffer, false));
239 PropertyList_add(&_system_properties,
240 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
241 }
242
243 /**
244 * Provide a slightly more user-friendly way of eliminating -XX flags.
245 * When a flag is eliminated, it can be added to this list in order to
246 * continue accepting this flag on the command-line, while issuing a warning
247 * and ignoring the value. Once the JDK version reaches the 'accept_until'
248 * limit, we flatly refuse to admit the existence of the flag. This allows
249 * a flag to die correctly over JDK releases using HSX.
250 */
251 typedef struct {
252 const char* name;
253 JDK_Version obsoleted_in; // when the flag went away
254 JDK_Version accept_until; // which version to start denying the existence
255 } ObsoleteFlag;
256
257 static ObsoleteFlag obsolete_jvm_flags[] = {
258 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
259 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
260 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
261 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
262 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
263 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
264 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
265 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
266 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
267 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
268 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
269 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
270 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
271 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
272 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
273 { "DefaultInitialRAMFraction",
274 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
275 { "UseDepthFirstScavengeOrder",
276 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
277 { "HandlePromotionFailure",
278 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
279 { "MaxLiveObjectEvacuationRatio",
280 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
281 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
282 { "UseParallelOldGCCompacting",
283 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
284 { "UseParallelDensePrefixUpdate",
285 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
286 { "UseParallelOldGCDensePrefix",
287 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
288 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
289 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
290 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
293 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
294 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
295 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
296 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
297 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
298 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
299 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
300 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
301 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
302 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
303 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
304 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
305 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
306 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
307 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
308 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
309 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
310 { "CompilationRepeat", JDK_Version::jdk(8), JDK_Version::jdk(9) },
311 #ifdef PRODUCT
312 { "DesiredMethodLimit",
313 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
314 #endif // PRODUCT
315 { NULL, JDK_Version(0), JDK_Version(0) }
316 };
317
318 // Returns true if the flag is obsolete and fits into the range specified
319 // for being ignored. In the case that the flag is ignored, the 'version'
320 // value is filled in with the version number when the flag became
321 // obsolete so that that value can be displayed to the user.
322 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
323 int i = 0;
324 assert(version != NULL, "Must provide a version buffer");
325 while (obsolete_jvm_flags[i].name != NULL) {
326 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
327 // <flag>=xxx form
328 // [-|+]<flag> form
329 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
330 ((s[0] == '+' || s[0] == '-') &&
331 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
332 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
333 *version = flag_status.obsoleted_in;
334 return true;
335 }
336 }
337 i++;
338 }
339 return false;
340 }
341
342 // Constructs the system class path (aka boot class path) from the following
343 // components, in order:
344 //
345 // prefix // from -Xbootclasspath/p:...
346 // endorsed // the expansion of -Djava.endorsed.dirs=...
347 // base // from os::get_system_properties() or -Xbootclasspath=
348 // suffix // from -Xbootclasspath/a:...
349 //
350 // java.endorsed.dirs is a list of directories; any jar or zip files in the
351 // directories are added to the sysclasspath just before the base.
352 //
353 // This could be AllStatic, but it isn't needed after argument processing is
354 // complete.
355 class SysClassPath: public StackObj {
356 public:
357 SysClassPath(const char* base);
358 ~SysClassPath();
359
360 inline void set_base(const char* base);
361 inline void add_prefix(const char* prefix);
362 inline void add_suffix_to_prefix(const char* suffix);
363 inline void add_suffix(const char* suffix);
364 inline void reset_path(const char* base);
365
366 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
367 // property. Must be called after all command-line arguments have been
368 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
369 // combined_path().
370 void expand_endorsed();
371
372 inline const char* get_base() const { return _items[_scp_base]; }
373 inline const char* get_prefix() const { return _items[_scp_prefix]; }
374 inline const char* get_suffix() const { return _items[_scp_suffix]; }
375 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
376
377 // Combine all the components into a single c-heap-allocated string; caller
378 // must free the string if/when no longer needed.
379 char* combined_path();
380
381 private:
382 // Utility routines.
383 static char* add_to_path(const char* path, const char* str, bool prepend);
384 static char* add_jars_to_path(char* path, const char* directory);
385
386 inline void reset_item_at(int index);
387
388 // Array indices for the items that make up the sysclasspath. All except the
389 // base are allocated in the C heap and freed by this class.
390 enum {
391 _scp_prefix, // from -Xbootclasspath/p:...
392 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
393 _scp_base, // the default sysclasspath
394 _scp_suffix, // from -Xbootclasspath/a:...
395 _scp_nitems // the number of items, must be last.
396 };
397
398 const char* _items[_scp_nitems];
399 DEBUG_ONLY(bool _expansion_done;)
400 };
401
402 SysClassPath::SysClassPath(const char* base) {
403 memset(_items, 0, sizeof(_items));
404 _items[_scp_base] = base;
405 DEBUG_ONLY(_expansion_done = false;)
406 }
407
408 SysClassPath::~SysClassPath() {
409 // Free everything except the base.
410 for (int i = 0; i < _scp_nitems; ++i) {
411 if (i != _scp_base) reset_item_at(i);
412 }
413 DEBUG_ONLY(_expansion_done = false;)
414 }
415
416 inline void SysClassPath::set_base(const char* base) {
417 _items[_scp_base] = base;
418 }
419
420 inline void SysClassPath::add_prefix(const char* prefix) {
421 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
422 }
423
424 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
425 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
426 }
427
428 inline void SysClassPath::add_suffix(const char* suffix) {
429 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
430 }
431
432 inline void SysClassPath::reset_item_at(int index) {
433 assert(index < _scp_nitems && index != _scp_base, "just checking");
434 if (_items[index] != NULL) {
435 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
436 _items[index] = NULL;
437 }
438 }
439
440 inline void SysClassPath::reset_path(const char* base) {
441 // Clear the prefix and suffix.
442 reset_item_at(_scp_prefix);
443 reset_item_at(_scp_suffix);
444 set_base(base);
445 }
446
447 //------------------------------------------------------------------------------
448
449 void SysClassPath::expand_endorsed() {
450 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
451
452 const char* path = Arguments::get_property("java.endorsed.dirs");
453 if (path == NULL) {
454 path = Arguments::get_endorsed_dir();
455 assert(path != NULL, "no default for java.endorsed.dirs");
456 }
457
458 char* expanded_path = NULL;
459 const char separator = *os::path_separator();
460 const char* const end = path + strlen(path);
461 while (path < end) {
462 const char* tmp_end = strchr(path, separator);
463 if (tmp_end == NULL) {
464 expanded_path = add_jars_to_path(expanded_path, path);
465 path = end;
466 } else {
467 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
468 memcpy(dirpath, path, tmp_end - path);
469 dirpath[tmp_end - path] = '\0';
470 expanded_path = add_jars_to_path(expanded_path, dirpath);
471 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
472 path = tmp_end + 1;
473 }
474 }
475 _items[_scp_endorsed] = expanded_path;
476 DEBUG_ONLY(_expansion_done = true;)
477 }
478
479 // Combine the bootclasspath elements, some of which may be null, into a single
480 // c-heap-allocated string.
481 char* SysClassPath::combined_path() {
482 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
483 assert(_expansion_done, "must call expand_endorsed() first.");
484
485 size_t lengths[_scp_nitems];
486 size_t total_len = 0;
487
488 const char separator = *os::path_separator();
489
490 // Get the lengths.
491 int i;
492 for (i = 0; i < _scp_nitems; ++i) {
493 if (_items[i] != NULL) {
494 lengths[i] = strlen(_items[i]);
495 // Include space for the separator char (or a NULL for the last item).
496 total_len += lengths[i] + 1;
497 }
498 }
499 assert(total_len > 0, "empty sysclasspath not allowed");
500
501 // Copy the _items to a single string.
502 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
503 char* cp_tmp = cp;
504 for (i = 0; i < _scp_nitems; ++i) {
505 if (_items[i] != NULL) {
506 memcpy(cp_tmp, _items[i], lengths[i]);
507 cp_tmp += lengths[i];
508 *cp_tmp++ = separator;
509 }
510 }
511 *--cp_tmp = '\0'; // Replace the extra separator.
512 return cp;
513 }
514
515 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
516 char*
517 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
518 char *cp;
519
520 assert(str != NULL, "just checking");
521 if (path == NULL) {
522 size_t len = strlen(str) + 1;
523 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
524 memcpy(cp, str, len); // copy the trailing null
525 } else {
526 const char separator = *os::path_separator();
527 size_t old_len = strlen(path);
528 size_t str_len = strlen(str);
529 size_t len = old_len + str_len + 2;
530
531 if (prepend) {
532 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
533 char* cp_tmp = cp;
534 memcpy(cp_tmp, str, str_len);
535 cp_tmp += str_len;
536 *cp_tmp = separator;
537 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
538 FREE_C_HEAP_ARRAY(char, path, mtInternal);
539 } else {
540 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
541 char* cp_tmp = cp + old_len;
542 *cp_tmp = separator;
543 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
544 }
545 }
546 return cp;
547 }
548
549 // Scan the directory and append any jar or zip files found to path.
550 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
551 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
552 DIR* dir = os::opendir(directory);
553 if (dir == NULL) return path;
554
555 char dir_sep[2] = { '\0', '\0' };
556 size_t directory_len = strlen(directory);
557 const char fileSep = *os::file_separator();
558 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
559
560 /* Scan the directory for jars/zips, appending them to path. */
561 struct dirent *entry;
562 while ((entry = os::readdir(dir)) != NULL) {
563 const char* name = entry->d_name;
564 const char* ext = name + strlen(name) - 4;
565 bool isJarOrZip = ext > name &&
566 (os::file_name_strcmp(ext, ".jar") == 0 ||
567 os::file_name_strcmp(ext, ".zip") == 0);
568 if (isJarOrZip) {
569 size_t length = directory_len + 2 + strlen(name);
570 char* jarpath = NEW_C_HEAP_ARRAY(char, length, mtInternal);
571 jio_snprintf(jarpath, length, "%s%s%s", directory, dir_sep, name);
572 path = add_to_path(path, jarpath, false);
573 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
574 }
575 }
576 os::closedir(dir);
577 return path;
578 }
579
580 // Parses a memory size specification string.
581 static bool atomull(const char *s, julong* result) {
582 julong n = 0;
583 int args_read = sscanf(s, JULONG_FORMAT, &n);
584 if (args_read != 1) {
585 return false;
586 }
587 while (*s != '\0' && isdigit(*s)) {
588 s++;
589 }
590 // 4705540: illegal if more characters are found after the first non-digit
591 if (strlen(s) > 1) {
592 return false;
593 }
594 switch (*s) {
595 case 'T': case 't':
596 *result = n * G * K;
597 // Check for overflow.
598 if (*result/((julong)G * K) != n) return false;
599 return true;
600 case 'G': case 'g':
601 *result = n * G;
602 if (*result/G != n) return false;
603 return true;
604 case 'M': case 'm':
605 *result = n * M;
606 if (*result/M != n) return false;
607 return true;
608 case 'K': case 'k':
609 *result = n * K;
610 if (*result/K != n) return false;
611 return true;
612 case '\0':
613 *result = n;
614 return true;
615 default:
616 return false;
617 }
618 }
619
620 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
621 if (size < min_size) return arg_too_small;
622 // Check that size will fit in a size_t (only relevant on 32-bit)
623 if (size > max_uintx) return arg_too_big;
624 return arg_in_range;
625 }
626
627 // Describe an argument out of range error
628 void Arguments::describe_range_error(ArgsRange errcode) {
629 switch(errcode) {
630 case arg_too_big:
631 jio_fprintf(defaultStream::error_stream(),
632 "The specified size exceeds the maximum "
633 "representable size.\n");
634 break;
635 case arg_too_small:
636 case arg_unreadable:
637 case arg_in_range:
638 // do nothing for now
639 break;
640 default:
641 ShouldNotReachHere();
642 }
643 }
644
645 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
646 return CommandLineFlags::boolAtPut(name, &value, origin);
647 }
648
649 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
650 double v;
651 if (sscanf(value, "%lf", &v) != 1) {
652 return false;
653 }
654
655 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
656 return true;
657 }
658 return false;
659 }
660
661 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
662 julong v;
663 intx intx_v;
664 bool is_neg = false;
665 // Check the sign first since atomull() parses only unsigned values.
666 if (*value == '-') {
667 if (!CommandLineFlags::intxAt(name, &intx_v)) {
668 return false;
669 }
670 value++;
671 is_neg = true;
672 }
673 if (!atomull(value, &v)) {
674 return false;
675 }
676 intx_v = (intx) v;
677 if (is_neg) {
678 intx_v = -intx_v;
679 }
680 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
681 return true;
682 }
683 uintx uintx_v = (uintx) v;
684 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
685 return true;
686 }
687 uint64_t uint64_t_v = (uint64_t) v;
688 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
689 return true;
690 }
691 return false;
692 }
693
694 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
695 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
696 // Contract: CommandLineFlags always returns a pointer that needs freeing.
697 FREE_C_HEAP_ARRAY(char, value, mtInternal);
698 return true;
699 }
700
701 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
702 const char* old_value = "";
703 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
704 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
705 size_t new_len = strlen(new_value);
706 const char* value;
707 char* free_this_too = NULL;
708 if (old_len == 0) {
709 value = new_value;
710 } else if (new_len == 0) {
711 value = old_value;
712 } else {
713 size_t length = old_len + 1 + new_len + 1;
714 char* buf = NEW_C_HEAP_ARRAY(char, length, mtInternal);
715 // each new setting adds another LINE to the switch:
716 jio_snprintf(buf, length, "%s\n%s", old_value, new_value);
717 value = buf;
718 free_this_too = buf;
719 }
720 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
721 // CommandLineFlags always returns a pointer that needs freeing.
722 FREE_C_HEAP_ARRAY(char, value, mtInternal);
723 if (free_this_too != NULL) {
724 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
725 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
726 }
727 return true;
728 }
729
730 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
731
732 // range of acceptable characters spelled out for portability reasons
733 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
734 #define BUFLEN 255
735 char name[BUFLEN+1];
736 char dummy;
737
738 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
739 return set_bool_flag(name, false, origin);
740 }
741 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
742 return set_bool_flag(name, true, origin);
743 }
744
745 char punct;
746 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
747 const char* value = strchr(arg, '=') + 1;
748 Flag* flag = Flag::find_flag(name, strlen(name));
749 if (flag != NULL && flag->is_ccstr()) {
750 if (flag->ccstr_accumulates()) {
751 return append_to_string_flag(name, value, origin);
752 } else {
753 if (value[0] == '\0') {
754 value = NULL;
755 }
756 return set_string_flag(name, value, origin);
757 }
758 }
759 }
760
761 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
762 const char* value = strchr(arg, '=') + 1;
763 // -XX:Foo:=xxx will reset the string flag to the given value.
764 if (value[0] == '\0') {
765 value = NULL;
766 }
767 return set_string_flag(name, value, origin);
768 }
769
770 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
771 #define SIGNED_NUMBER_RANGE "[-0123456789]"
772 #define NUMBER_RANGE "[0123456789]"
773 char value[BUFLEN + 1];
774 char value2[BUFLEN + 1];
775 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
776 // Looks like a floating-point number -- try again with more lenient format string
777 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
778 return set_fp_numeric_flag(name, value, origin);
779 }
780 }
781
782 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
783 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
784 return set_numeric_flag(name, value, origin);
785 }
786
787 return false;
788 }
789
790 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
791 assert(bldarray != NULL, "illegal argument");
792
793 if (arg == NULL) {
794 return;
795 }
796
797 int new_count = *count + 1;
798
799 // expand the array and add arg to the last element
800 if (*bldarray == NULL) {
801 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
802 } else {
803 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
804 }
805 (*bldarray)[*count] = strdup(arg);
806 *count = new_count;
807 }
808
809 void Arguments::build_jvm_args(const char* arg) {
810 add_string(&_jvm_args_array, &_num_jvm_args, arg);
811 }
812
813 void Arguments::build_jvm_flags(const char* arg) {
814 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
815 }
816
817 // utility function to return a string that concatenates all
818 // strings in a given char** array
819 const char* Arguments::build_resource_string(char** args, int count) {
820 if (args == NULL || count == 0) {
821 return NULL;
822 }
823 size_t length = 0;
824 for (int i = 0; i < count; i++) {
825 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character
826 }
827 char* s = NEW_RESOURCE_ARRAY(char, length);
828 char* dst = s;
829 for (int j = 0; j < count; j++) {
830 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character
831 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character
832 dst += offset;
833 length -= offset;
834 }
835 return (const char*) s;
836 }
837
838 void Arguments::print_on(outputStream* st) {
839 st->print_cr("VM Arguments:");
840 if (num_jvm_flags() > 0) {
841 st->print("jvm_flags: "); print_jvm_flags_on(st);
842 }
843 if (num_jvm_args() > 0) {
844 st->print("jvm_args: "); print_jvm_args_on(st);
845 }
846 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
847 if (_java_class_path != NULL) {
848 char* path = _java_class_path->value();
849 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
850 }
851 st->print_cr("Launcher Type: %s", _sun_java_launcher);
852 }
853
854 void Arguments::print_jvm_flags_on(outputStream* st) {
855 if (_num_jvm_flags > 0) {
856 for (int i=0; i < _num_jvm_flags; i++) {
857 st->print("%s ", _jvm_flags_array[i]);
858 }
859 st->cr();
860 }
861 }
862
863 void Arguments::print_jvm_args_on(outputStream* st) {
864 if (_num_jvm_args > 0) {
865 for (int i=0; i < _num_jvm_args; i++) {
866 st->print("%s ", _jvm_args_array[i]);
867 }
868 st->cr();
869 }
870 }
871
872 bool Arguments::process_argument(const char* arg,
873 jboolean ignore_unrecognized, Flag::Flags origin) {
874
875 JDK_Version since = JDK_Version();
876
877 if (parse_argument(arg, origin) || ignore_unrecognized) {
878 return true;
879 }
880
881 bool has_plus_minus = (*arg == '+' || *arg == '-');
882 const char* const argname = has_plus_minus ? arg + 1 : arg;
883 if (is_newly_obsolete(arg, &since)) {
884 char version[256];
885 since.to_string(version, sizeof(version));
886 warning("ignoring option %s; support was removed in %s", argname, version);
887 return true;
888 }
889
890 // For locked flags, report a custom error message if available.
891 // Otherwise, report the standard unrecognized VM option.
892
893 size_t arg_len;
894 const char* equal_sign = strchr(argname, '=');
895 if (equal_sign == NULL) {
896 arg_len = strlen(argname);
897 } else {
898 arg_len = equal_sign - argname;
899 }
900
901 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
902 if (found_flag != NULL) {
903 char locked_message_buf[BUFLEN];
904 found_flag->get_locked_message(locked_message_buf, BUFLEN);
905 if (strlen(locked_message_buf) == 0) {
906 if (found_flag->is_bool() && !has_plus_minus) {
907 jio_fprintf(defaultStream::error_stream(),
908 "Missing +/- setting for VM option '%s'\n", argname);
909 } else if (!found_flag->is_bool() && has_plus_minus) {
910 jio_fprintf(defaultStream::error_stream(),
911 "Unexpected +/- setting in VM option '%s'\n", argname);
912 } else {
913 jio_fprintf(defaultStream::error_stream(),
914 "Improperly specified VM option '%s'\n", argname);
915 }
916 } else {
917 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
918 }
919 } else {
920 jio_fprintf(defaultStream::error_stream(),
921 "Unrecognized VM option '%s'\n", argname);
922 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
923 if (fuzzy_matched != NULL) {
924 jio_fprintf(defaultStream::error_stream(),
925 "Did you mean '%s%s%s'?\n",
926 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
927 fuzzy_matched->_name,
928 (fuzzy_matched->is_bool()) ? "" : "=<value>");
929 }
930 }
931
932 // allow for commandline "commenting out" options like -XX:#+Verbose
933 return arg[0] == '#';
934 }
935
936 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
937 FILE* stream = fopen(file_name, "rb");
938 if (stream == NULL) {
939 if (should_exist) {
940 jio_fprintf(defaultStream::error_stream(),
941 "Could not open settings file %s\n", file_name);
942 return false;
943 } else {
944 return true;
945 }
946 }
947
948 char token[1024];
949 int pos = 0;
950
951 bool in_white_space = true;
952 bool in_comment = false;
953 bool in_quote = false;
954 char quote_c = 0;
955 bool result = true;
956
957 int c = getc(stream);
958 while(c != EOF && pos < (int)(sizeof(token)-1)) {
959 if (in_white_space) {
960 if (in_comment) {
961 if (c == '\n') in_comment = false;
962 } else {
963 if (c == '#') in_comment = true;
964 else if (!isspace(c)) {
965 in_white_space = false;
966 token[pos++] = c;
967 }
968 }
969 } else {
970 if (c == '\n' || (!in_quote && isspace(c))) {
971 // token ends at newline, or at unquoted whitespace
972 // this allows a way to include spaces in string-valued options
973 token[pos] = '\0';
974 logOption(token);
975 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
976 build_jvm_flags(token);
977 pos = 0;
978 in_white_space = true;
979 in_quote = false;
980 } else if (!in_quote && (c == '\'' || c == '"')) {
981 in_quote = true;
982 quote_c = c;
983 } else if (in_quote && (c == quote_c)) {
984 in_quote = false;
985 } else {
986 token[pos++] = c;
987 }
988 }
989 c = getc(stream);
990 }
991 if (pos > 0) {
992 token[pos] = '\0';
993 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
994 build_jvm_flags(token);
995 }
996 fclose(stream);
997 return result;
998 }
999
1000 //=============================================================================================================
1001 // Parsing of properties (-D)
1002
1003 const char* Arguments::get_property(const char* key) {
1004 return PropertyList_get_value(system_properties(), key);
1005 }
1006
1007 bool Arguments::add_property(const char* prop) {
1008 const char* eq = strchr(prop, '=');
1009 char* key;
1010 // ns must be static--its address may be stored in a SystemProperty object.
1011 const static char ns[1] = {0};
1012 char* value = (char *)ns;
1013
1014 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1015 key = AllocateHeap(key_len + 1, mtInternal);
1016 strncpy(key, prop, key_len);
1017 key[key_len] = '\0';
1018
1019 if (eq != NULL) {
1020 size_t value_len = strlen(prop) - key_len - 1;
1021 value = AllocateHeap(value_len + 1, mtInternal);
1022 strncpy(value, &prop[key_len + 1], value_len + 1);
1023 }
1024
1025 if (strcmp(key, "java.compiler") == 0) {
1026 process_java_compiler_argument(value);
1027 FreeHeap(key);
1028 if (eq != NULL) {
1029 FreeHeap(value);
1030 }
1031 return true;
1032 } else if (strcmp(key, "sun.java.command") == 0) {
1033 _java_command = value;
1034
1035 // Record value in Arguments, but let it get passed to Java.
1036 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1037 // launcher.pid property is private and is processed
1038 // in process_sun_java_launcher_properties();
1039 // the sun.java.launcher property is passed on to the java application
1040 FreeHeap(key);
1041 if (eq != NULL) {
1042 FreeHeap(value);
1043 }
1044 return true;
1045 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1046 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1047 // its value without going through the property list or making a Java call.
1048 _java_vendor_url_bug = value;
1049 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1050 PropertyList_unique_add(&_system_properties, key, value, true);
1051 return true;
1052 }
1053 // Create new property and add at the end of the list
1054 PropertyList_unique_add(&_system_properties, key, value);
1055 return true;
1056 }
1057
1058 //===========================================================================================================
1059 // Setting int/mixed/comp mode flags
1060
1061 void Arguments::set_mode_flags(Mode mode) {
1062 // Set up default values for all flags.
1063 // If you add a flag to any of the branches below,
1064 // add a default value for it here.
1065 set_java_compiler(false);
1066 _mode = mode;
1067
1068 // Ensure Agent_OnLoad has the correct initial values.
1069 // This may not be the final mode; mode may change later in onload phase.
1070 PropertyList_unique_add(&_system_properties, "java.vm.info",
1071 (char*)VM_Version::vm_info_string(), false);
1072
1073 UseInterpreter = true;
1074 UseCompiler = true;
1075 UseLoopCounter = true;
1076
1077 #ifndef ZERO
1078 // Turn these off for mixed and comp. Leave them on for Zero.
1079 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1080 UseFastAccessorMethods = (mode == _int);
1081 }
1082 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1083 UseFastEmptyMethods = (mode == _int);
1084 }
1085 #endif
1086
1087 // Default values may be platform/compiler dependent -
1088 // use the saved values
1089 ClipInlining = Arguments::_ClipInlining;
1090 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1091 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1092 BackgroundCompilation = Arguments::_BackgroundCompilation;
1093
1094 // Change from defaults based on mode
1095 switch (mode) {
1096 default:
1097 ShouldNotReachHere();
1098 break;
1099 case _int:
1100 UseCompiler = false;
1101 UseLoopCounter = false;
1102 AlwaysCompileLoopMethods = false;
1103 UseOnStackReplacement = false;
1104 break;
1105 case _mixed:
1106 // same as default
1107 break;
1108 case _comp:
1109 UseInterpreter = false;
1110 BackgroundCompilation = false;
1111 ClipInlining = false;
1112 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1113 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1114 // compile a level 4 (C2) and then continue executing it.
1115 if (TieredCompilation) {
1116 Tier3InvokeNotifyFreqLog = 0;
1117 Tier4InvocationThreshold = 0;
1118 }
1119 break;
1120 }
1121 }
1122
1123 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1124 // Conflict: required to use shared spaces (-Xshare:on), but
1125 // incompatible command line options were chosen.
1126
1127 static void no_shared_spaces(const char* message) {
1128 if (RequireSharedSpaces) {
1129 jio_fprintf(defaultStream::error_stream(),
1130 "Class data sharing is inconsistent with other specified options.\n");
1131 vm_exit_during_initialization("Unable to use shared archive.", message);
1132 } else {
1133 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1134 }
1135 }
1136 #endif
1137
1138 void Arguments::set_tiered_flags() {
1139 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1140 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1141 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1142 }
1143 if (CompilationPolicyChoice < 2) {
1144 vm_exit_during_initialization(
1145 "Incompatible compilation policy selected", NULL);
1146 }
1147 // Increase the code cache size - tiered compiles a lot more.
1148 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1149 NOT_AARCH64(FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5));
1150 AARCH64_ONLY(FLAG_SET_DEFAULT(ReservedCodeCacheSize,
1151 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)));
1152 }
1153 if (!UseInterpreter) { // -Xcomp
1154 Tier3InvokeNotifyFreqLog = 0;
1155 Tier4InvocationThreshold = 0;
1156 }
1157 }
1158
1159 /**
1160 * Returns the minimum number of compiler threads needed to run the JVM. The following
1161 * configurations are possible.
1162 *
1163 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1164 * compiler threads is 0.
1165 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1166 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1167 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1168 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1169 * C1 can be used, so the minimum number of compiler threads is 1.
1170 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1171 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1172 * the minimum number of compiler threads is 2.
1173 */
1174 int Arguments::get_min_number_of_compiler_threads() {
1175 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1176 return 0; // case 1
1177 #else
1178 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1179 return 1; // case 2 or case 3
1180 }
1181 return 2; // case 4 (tiered)
1182 #endif
1183 }
1184
1185 #if INCLUDE_ALL_GCS
1186 static void disable_adaptive_size_policy(const char* collector_name) {
1187 if (UseAdaptiveSizePolicy) {
1188 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1189 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1190 collector_name);
1191 }
1192 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1193 }
1194 }
1195
1196 void Arguments::set_parnew_gc_flags() {
1197 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1198 "control point invariant");
1199 assert(UseParNewGC, "Error");
1200
1201 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1202 disable_adaptive_size_policy("UseParNewGC");
1203
1204 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1205 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1206 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1207 } else if (ParallelGCThreads == 0) {
1208 jio_fprintf(defaultStream::error_stream(),
1209 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1210 vm_exit(1);
1211 }
1212
1213 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1214 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1215 // we set them to 1024 and 1024.
1216 // See CR 6362902.
1217 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1218 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1219 }
1220 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1221 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1222 }
1223
1224 // AlwaysTenure flag should make ParNew promote all at first collection.
1225 // See CR 6362902.
1226 if (AlwaysTenure) {
1227 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1228 }
1229 // When using compressed oops, we use local overflow stacks,
1230 // rather than using a global overflow list chained through
1231 // the klass word of the object's pre-image.
1232 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1233 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1234 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1235 }
1236 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1237 }
1238 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1239 }
1240
1241 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1242 // sparc/solaris for certain applications, but would gain from
1243 // further optimization and tuning efforts, and would almost
1244 // certainly gain from analysis of platform and environment.
1245 void Arguments::set_cms_and_parnew_gc_flags() {
1246 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1247 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1248
1249 // If we are using CMS, we prefer to UseParNewGC,
1250 // unless explicitly forbidden.
1251 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1252 FLAG_SET_ERGO(bool, UseParNewGC, true);
1253 }
1254
1255 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1256 disable_adaptive_size_policy("UseConcMarkSweepGC");
1257
1258 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1259 // as needed.
1260 if (UseParNewGC) {
1261 set_parnew_gc_flags();
1262 }
1263
1264 size_t max_heap = align_size_down(MaxHeapSize,
1265 CardTableRS::ct_max_alignment_constraint());
1266
1267 // Now make adjustments for CMS
1268 intx tenuring_default = (intx)6;
1269 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1270
1271 // Preferred young gen size for "short" pauses:
1272 // upper bound depends on # of threads and NewRatio.
1273 const uintx parallel_gc_threads =
1274 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1275 const size_t preferred_max_new_size_unaligned =
1276 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1277 size_t preferred_max_new_size =
1278 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1279
1280 // Unless explicitly requested otherwise, size young gen
1281 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1282
1283 // If either MaxNewSize or NewRatio is set on the command line,
1284 // assume the user is trying to set the size of the young gen.
1285 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1286
1287 // Set MaxNewSize to our calculated preferred_max_new_size unless
1288 // NewSize was set on the command line and it is larger than
1289 // preferred_max_new_size.
1290 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1291 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1292 } else {
1293 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1294 }
1295 if (PrintGCDetails && Verbose) {
1296 // Too early to use gclog_or_tty
1297 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1298 }
1299
1300 // Code along this path potentially sets NewSize and OldSize
1301 if (PrintGCDetails && Verbose) {
1302 // Too early to use gclog_or_tty
1303 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1304 " initial_heap_size: " SIZE_FORMAT
1305 " max_heap: " SIZE_FORMAT,
1306 min_heap_size(), InitialHeapSize, max_heap);
1307 }
1308 size_t min_new = preferred_max_new_size;
1309 if (FLAG_IS_CMDLINE(NewSize)) {
1310 min_new = NewSize;
1311 }
1312 if (max_heap > min_new && min_heap_size() > min_new) {
1313 // Unless explicitly requested otherwise, make young gen
1314 // at least min_new, and at most preferred_max_new_size.
1315 if (FLAG_IS_DEFAULT(NewSize)) {
1316 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1317 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1318 if (PrintGCDetails && Verbose) {
1319 // Too early to use gclog_or_tty
1320 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1321 }
1322 }
1323 // Unless explicitly requested otherwise, size old gen
1324 // so it's NewRatio x of NewSize.
1325 if (FLAG_IS_DEFAULT(OldSize)) {
1326 if (max_heap > NewSize) {
1327 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1328 if (PrintGCDetails && Verbose) {
1329 // Too early to use gclog_or_tty
1330 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1331 }
1332 }
1333 }
1334 }
1335 }
1336 // Unless explicitly requested otherwise, definitely
1337 // promote all objects surviving "tenuring_default" scavenges.
1338 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1339 FLAG_IS_DEFAULT(SurvivorRatio)) {
1340 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1341 }
1342 // If we decided above (or user explicitly requested)
1343 // `promote all' (via MaxTenuringThreshold := 0),
1344 // prefer minuscule survivor spaces so as not to waste
1345 // space for (non-existent) survivors
1346 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1347 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1348 }
1349 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1350 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1351 // This is done in order to make ParNew+CMS configuration to work
1352 // with YoungPLABSize and OldPLABSize options.
1353 // See CR 6362902.
1354 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1355 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1356 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1357 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1358 // the value (either from the command line or ergonomics) of
1359 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1360 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1361 } else {
1362 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1363 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1364 // we'll let it to take precedence.
1365 jio_fprintf(defaultStream::error_stream(),
1366 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1367 " options are specified for the CMS collector."
1368 " CMSParPromoteBlocksToClaim will take precedence.\n");
1369 }
1370 }
1371 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1372 // OldPLAB sizing manually turned off: Use a larger default setting,
1373 // unless it was manually specified. This is because a too-low value
1374 // will slow down scavenges.
1375 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1376 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1377 }
1378 }
1379 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1380 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1381 // If either of the static initialization defaults have changed, note this
1382 // modification.
1383 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1384 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1385 }
1386
1387 if (PrintGCDetails && Verbose) {
1388 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1389 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1390 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1391 }
1392 }
1393 #endif // INCLUDE_ALL_GCS
1394
1395 void set_object_alignment() {
1396 // Object alignment.
1397 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1398 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1399 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1400 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1401 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1402 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1403
1404 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1405 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1406
1407 // Oop encoding heap max
1408 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1409
1410 #if INCLUDE_ALL_GCS
1411 // Set CMS global values
1412 CompactibleFreeListSpace::set_cms_values();
1413 #endif // INCLUDE_ALL_GCS
1414 }
1415
1416 bool verify_object_alignment() {
1417 // Object alignment.
1418 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1419 jio_fprintf(defaultStream::error_stream(),
1420 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1421 (int)ObjectAlignmentInBytes);
1422 return false;
1423 }
1424 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1425 jio_fprintf(defaultStream::error_stream(),
1426 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1427 (int)ObjectAlignmentInBytes, BytesPerLong);
1428 return false;
1429 }
1430 // It does not make sense to have big object alignment
1431 // since a space lost due to alignment will be greater
1432 // then a saved space from compressed oops.
1433 if ((int)ObjectAlignmentInBytes > 256) {
1434 jio_fprintf(defaultStream::error_stream(),
1435 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1436 (int)ObjectAlignmentInBytes);
1437 return false;
1438 }
1439 // In case page size is very small.
1440 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1441 jio_fprintf(defaultStream::error_stream(),
1442 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1443 (int)ObjectAlignmentInBytes, os::vm_page_size());
1444 return false;
1445 }
1446 if(SurvivorAlignmentInBytes == 0) {
1447 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1448 } else {
1449 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1450 jio_fprintf(defaultStream::error_stream(),
1451 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1452 (int)SurvivorAlignmentInBytes);
1453 return false;
1454 }
1455 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1456 jio_fprintf(defaultStream::error_stream(),
1457 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1458 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1459 return false;
1460 }
1461 }
1462 return true;
1463 }
1464
1465 size_t Arguments::max_heap_for_compressed_oops() {
1466 // Avoid sign flip.
1467 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1468 // We need to fit both the NULL page and the heap into the memory budget, while
1469 // keeping alignment constraints of the heap. To guarantee the latter, as the
1470 // NULL page is located before the heap, we pad the NULL page to the conservative
1471 // maximum alignment that the GC may ever impose upon the heap.
1472 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1473 _conservative_max_heap_alignment);
1474
1475 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1476 NOT_LP64(ShouldNotReachHere(); return 0);
1477 }
1478
1479 bool Arguments::should_auto_select_low_pause_collector() {
1480 if (UseAutoGCSelectPolicy &&
1481 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1482 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1483 if (PrintGCDetails) {
1484 // Cannot use gclog_or_tty yet.
1485 tty->print_cr("Automatic selection of the low pause collector"
1486 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1487 }
1488 return true;
1489 }
1490 return false;
1491 }
1492
1493 void Arguments::set_use_compressed_oops() {
1494 #ifndef ZERO
1495 #ifdef _LP64
1496 // MaxHeapSize is not set up properly at this point, but
1497 // the only value that can override MaxHeapSize if we are
1498 // to use UseCompressedOops is InitialHeapSize.
1499 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1500
1501 if (max_heap_size <= max_heap_for_compressed_oops()) {
1502 #if !defined(COMPILER1) || defined(TIERED)
1503 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1504 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1505 }
1506 #endif
1507 #ifdef _WIN64
1508 if (UseLargePages && UseCompressedOops) {
1509 // Cannot allocate guard pages for implicit checks in indexed addressing
1510 // mode, when large pages are specified on windows.
1511 // This flag could be switched ON if narrow oop base address is set to 0,
1512 // see code in Universe::initialize_heap().
1513 Universe::set_narrow_oop_use_implicit_null_checks(false);
1514 }
1515 #endif // _WIN64
1516 } else {
1517 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1518 warning("Max heap size too large for Compressed Oops");
1519 FLAG_SET_DEFAULT(UseCompressedOops, false);
1520 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1521 }
1522 }
1523 #endif // _LP64
1524 #endif // ZERO
1525 }
1526
1527 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1528 // set_use_compressed_oops().
1529 void Arguments::set_use_compressed_klass_ptrs() {
1530 #ifndef ZERO
1531 #ifdef _LP64
1532 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1533 if (!UseCompressedOops) {
1534 if (UseCompressedClassPointers) {
1535 warning("UseCompressedClassPointers requires UseCompressedOops");
1536 }
1537 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1538 } else {
1539 // Turn on UseCompressedClassPointers too
1540 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1541 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1542 }
1543 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1544 if (UseCompressedClassPointers) {
1545 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1546 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1547 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1548 }
1549 }
1550 }
1551 #endif // _LP64
1552 #endif // !ZERO
1553 }
1554
1555 void Arguments::set_conservative_max_heap_alignment() {
1556 // The conservative maximum required alignment for the heap is the maximum of
1557 // the alignments imposed by several sources: any requirements from the heap
1558 // itself, the collector policy and the maximum page size we may run the VM
1559 // with.
1560 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1561 #if INCLUDE_ALL_GCS
1562 if (UseParallelGC) {
1563 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1564 } else if (UseG1GC) {
1565 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1566 } else if (UseShenandoahGC) {
1567 heap_alignment = ShenandoahHeap::conservative_max_heap_alignment();
1568 }
1569 #endif // INCLUDE_ALL_GCS
1570 _conservative_max_heap_alignment = MAX4(heap_alignment,
1571 (size_t)os::vm_allocation_granularity(),
1572 os::max_page_size(),
1573 CollectorPolicy::compute_heap_alignment());
1574 }
1575
1576 void Arguments::select_gc_ergonomically() {
1577 if (os::is_server_class_machine()) {
1578 if (should_auto_select_low_pause_collector()) {
1579 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1580 } else {
1581 FLAG_SET_ERGO(bool, UseParallelGC, true);
1582 }
1583 }
1584 }
1585
1586 void Arguments::select_gc() {
1587 if (!gc_selected()) {
1588 select_gc_ergonomically();
1589 }
1590 }
1591
1592 void Arguments::set_ergonomics_flags() {
1593 select_gc();
1594
1595 #ifdef COMPILER2
1596 // Shared spaces work fine with other GCs but causes bytecode rewriting
1597 // to be disabled, which hurts interpreter performance and decreases
1598 // server performance. When -server is specified, keep the default off
1599 // unless it is asked for. Future work: either add bytecode rewriting
1600 // at link time, or rewrite bytecodes in non-shared methods.
1601 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1602 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1603 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1604 }
1605 #endif
1606
1607 set_conservative_max_heap_alignment();
1608
1609 #ifndef ZERO
1610 #ifdef _LP64
1611 set_use_compressed_oops();
1612
1613 // set_use_compressed_klass_ptrs() must be called after calling
1614 // set_use_compressed_oops().
1615 set_use_compressed_klass_ptrs();
1616
1617 // Also checks that certain machines are slower with compressed oops
1618 // in vm_version initialization code.
1619 #endif // _LP64
1620 #endif // !ZERO
1621 }
1622
1623 void Arguments::set_parallel_gc_flags() {
1624 assert(UseParallelGC || UseParallelOldGC, "Error");
1625 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1626 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1627 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1628 }
1629 FLAG_SET_DEFAULT(UseParallelGC, true);
1630
1631 // If no heap maximum was requested explicitly, use some reasonable fraction
1632 // of the physical memory, up to a maximum of 1GB.
1633 FLAG_SET_DEFAULT(ParallelGCThreads,
1634 Abstract_VM_Version::parallel_worker_threads());
1635 if (ParallelGCThreads == 0) {
1636 jio_fprintf(defaultStream::error_stream(),
1637 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1638 vm_exit(1);
1639 }
1640
1641 if (UseAdaptiveSizePolicy) {
1642 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1643 // unless the user actually sets these flags.
1644 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1645 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1646 _min_heap_free_ratio = MinHeapFreeRatio;
1647 }
1648 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1649 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1650 _max_heap_free_ratio = MaxHeapFreeRatio;
1651 }
1652 }
1653
1654 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1655 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1656 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1657 // See CR 6362902 for details.
1658 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1659 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1660 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1661 }
1662 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1663 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1664 }
1665 }
1666
1667 if (UseParallelOldGC) {
1668 // Par compact uses lower default values since they are treated as
1669 // minimums. These are different defaults because of the different
1670 // interpretation and are not ergonomically set.
1671 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1672 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1673 }
1674 }
1675 }
1676
1677 void Arguments::set_g1_gc_flags() {
1678 assert(UseG1GC, "Error");
1679 #ifdef COMPILER1
1680 FastTLABRefill = false;
1681 #endif
1682 FLAG_SET_DEFAULT(ParallelGCThreads,
1683 Abstract_VM_Version::parallel_worker_threads());
1684 if (ParallelGCThreads == 0) {
1685 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1686 }
1687
1688 #if INCLUDE_ALL_GCS
1689 if (G1ConcRefinementThreads == 0) {
1690 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1691 }
1692 #endif
1693
1694 // MarkStackSize will be set (if it hasn't been set by the user)
1695 // when concurrent marking is initialized.
1696 // Its value will be based upon the number of parallel marking threads.
1697 // But we do set the maximum mark stack size here.
1698 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1699 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1700 }
1701
1702 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1703 // In G1, we want the default GC overhead goal to be higher than
1704 // say in PS. So we set it here to 10%. Otherwise the heap might
1705 // be expanded more aggressively than we would like it to. In
1706 // fact, even 10% seems to not be high enough in some cases
1707 // (especially small GC stress tests that the main thing they do
1708 // is allocation). We might consider increase it further.
1709 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1710 }
1711
1712 if (PrintGCDetails && Verbose) {
1713 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1714 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1715 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1716 }
1717 }
1718
1719 void Arguments::set_shenandoah_gc_flags() {
1720
1721 #if !(defined AARCH64 || defined AMD64 || defined IA32)
1722 UNSUPPORTED_GC_OPTION(UseShenandoahGC);
1723 #endif
1724
1725 #if 0 // leave this block as stepping stone for future platforms
1726 warning("Shenandoah GC is not fully supported on this platform:");
1727 warning(" concurrent modes are not supported, only STW cycles are enabled;");
1728 warning(" arch-specific barrier code is not implemented, disabling barriers;");
1729
1730 #if INCLUDE_ALL_GCS
1731 FLAG_SET_DEFAULT(ShenandoahGCHeuristics, "passive");
1732
1733 FLAG_SET_DEFAULT(ShenandoahSATBBarrier, false);
1734 FLAG_SET_DEFAULT(ShenandoahLoadRefBarrier, false);
1735 FLAG_SET_DEFAULT(ShenandoahKeepAliveBarrier, false);
1736 FLAG_SET_DEFAULT(ShenandoahStoreValEnqueueBarrier, false);
1737 FLAG_SET_DEFAULT(ShenandoahCASBarrier, false);
1738 FLAG_SET_DEFAULT(ShenandoahCloneBarrier, false);
1739
1740 FLAG_SET_DEFAULT(ShenandoahVerifyOptoBarriers, false);
1741 #endif
1742 #endif
1743
1744 #if INCLUDE_ALL_GCS
1745 if (!FLAG_IS_DEFAULT(ShenandoahGarbageThreshold)) {
1746 if (0 > ShenandoahGarbageThreshold || ShenandoahGarbageThreshold > 100) {
1747 vm_exit_during_initialization("The flag -XX:ShenandoahGarbageThreshold is out of range", NULL);
1748 }
1749 }
1750
1751 if (!FLAG_IS_DEFAULT(ShenandoahAllocationThreshold)) {
1752 if (0 > ShenandoahAllocationThreshold || ShenandoahAllocationThreshold > 100) {
1753 vm_exit_during_initialization("The flag -XX:ShenandoahAllocationThreshold is out of range", NULL);
1754 }
1755 }
1756
1757 if (!FLAG_IS_DEFAULT(ShenandoahFreeThreshold)) {
1758 if (0 > ShenandoahFreeThreshold || ShenandoahFreeThreshold > 100) {
1759 vm_exit_during_initialization("The flag -XX:ShenandoahFreeThreshold is out of range", NULL);
1760 }
1761 }
1762 #endif
1763
1764 #if INCLUDE_ALL_GCS
1765 if (UseLargePages && (MaxHeapSize / os::large_page_size()) < ShenandoahHeapRegion::MIN_NUM_REGIONS) {
1766 warning("Large pages size (" SIZE_FORMAT "K) is too large to afford page-sized regions, disabling uncommit",
1767 os::large_page_size() / K);
1768 FLAG_SET_DEFAULT(ShenandoahUncommit, false);
1769 }
1770 #endif
1771
1772 // Enable NUMA by default. While Shenandoah is not NUMA-aware, enabling NUMA makes
1773 // storage allocation code NUMA-aware.
1774 if (FLAG_IS_DEFAULT(UseNUMA)) {
1775 FLAG_SET_DEFAULT(UseNUMA, true);
1776 }
1777
1778 // Set up default number of concurrent threads. We want to have cycles complete fast
1779 // enough, but we also do not want to steal too much CPU from the concurrently running
1780 // application. Using 1/4 of available threads for concurrent GC seems a good
1781 // compromise here.
1782 bool ergo_conc = FLAG_IS_DEFAULT(ConcGCThreads);
1783 if (ergo_conc) {
1784 FLAG_SET_DEFAULT(ConcGCThreads, MAX2(1, os::processor_count() / 4));
1785 }
1786
1787 if (ConcGCThreads == 0) {
1788 vm_exit_during_initialization("Shenandoah expects ConcGCThreads > 0, check -XX:ConcGCThreads=#");
1789 }
1790
1791 // Set up default number of parallel threads. We want to have decent pauses performance
1792 // which would use parallel threads, but we also do not want to do too many threads
1793 // that will overwhelm the OS scheduler. Using 1/2 of available threads seems to be a fair
1794 // compromise here. Due to implementation constraints, it should not be lower than
1795 // the number of concurrent threads.
1796 bool ergo_parallel = FLAG_IS_DEFAULT(ParallelGCThreads);
1797 if (ergo_parallel) {
1798 FLAG_SET_DEFAULT(ParallelGCThreads, MAX2(1, os::processor_count() / 2));
1799 }
1800
1801 if (ParallelGCThreads == 0) {
1802 vm_exit_during_initialization("Shenandoah expects ParallelGCThreads > 0, check -XX:ParallelGCThreads=#");
1803 }
1804
1805 // Make sure ergonomic decisions do not break the thread count invariants.
1806 // This may happen when user overrides one of the flags, but not the other.
1807 // When that happens, we want to adjust the setting that was set ergonomically.
1808 if (ParallelGCThreads < ConcGCThreads) {
1809 if (ergo_conc && !ergo_parallel) {
1810 FLAG_SET_DEFAULT(ConcGCThreads, ParallelGCThreads);
1811 } else if (!ergo_conc && ergo_parallel) {
1812 FLAG_SET_DEFAULT(ParallelGCThreads, ConcGCThreads);
1813 } else if (ergo_conc && ergo_parallel) {
1814 // Should not happen, check the ergonomic computation above. Fail with relevant error.
1815 vm_exit_during_initialization("Shenandoah thread count ergonomic error");
1816 } else {
1817 // User settings error, report and ask user to rectify.
1818 vm_exit_during_initialization("Shenandoah expects ConcGCThreads <= ParallelGCThreads, check -XX:ParallelGCThreads, -XX:ConcGCThreads");
1819 }
1820 }
1821
1822 if (FLAG_IS_DEFAULT(ParallelRefProcEnabled)) {
1823 FLAG_SET_DEFAULT(ParallelRefProcEnabled, true);
1824 }
1825
1826 #if INCLUDE_ALL_GCS
1827 if (ShenandoahRegionSampling && FLAG_IS_DEFAULT(PerfDataMemorySize)) {
1828 // When sampling is enabled, max out the PerfData memory to get more
1829 // Shenandoah data in, including Matrix.
1830 FLAG_SET_DEFAULT(PerfDataMemorySize, 2048*K);
1831 }
1832 #endif
1833
1834 #ifdef COMPILER2
1835 // Shenandoah cares more about pause times, rather than raw throughput.
1836 // Enabling safepoints in counted loops makes it more responsive with
1837 // long loops. However, it is risky in 8u, due to bugs it brings, for
1838 // example JDK-8176506. Warn user about this, and proceed.
1839 if (UseCountedLoopSafepoints) {
1840 warning("Enabling -XX:UseCountedLoopSafepoints is known to cause JVM bugs. Use at your own risk.");
1841 }
1842
1843 #ifdef ASSERT
1844 // C2 barrier verification is only reliable when all default barriers are enabled
1845 if (ShenandoahVerifyOptoBarriers &&
1846 (!FLAG_IS_DEFAULT(ShenandoahSATBBarrier) ||
1847 !FLAG_IS_DEFAULT(ShenandoahLoadRefBarrier) ||
1848 !FLAG_IS_DEFAULT(ShenandoahKeepAliveBarrier) ||
1849 !FLAG_IS_DEFAULT(ShenandoahStoreValEnqueueBarrier) ||
1850 !FLAG_IS_DEFAULT(ShenandoahCASBarrier) ||
1851 !FLAG_IS_DEFAULT(ShenandoahCloneBarrier)
1852 )) {
1853 warning("Unusual barrier configuration, disabling C2 barrier verification");
1854 FLAG_SET_DEFAULT(ShenandoahVerifyOptoBarriers, false);
1855 }
1856 #else
1857 guarantee(!ShenandoahVerifyOptoBarriers, "Should be disabled");
1858 #endif // ASSERT
1859 #endif // COMPILER2
1860
1861 #if INCLUDE_ALL_GCS
1862 if (AlwaysPreTouch) {
1863 // Shenandoah handles pre-touch on its own. It does not let the
1864 // generic storage code to do the pre-touch before Shenandoah has
1865 // a chance to do it on its own.
1866 FLAG_SET_DEFAULT(AlwaysPreTouch, false);
1867 FLAG_SET_DEFAULT(ShenandoahAlwaysPreTouch, true);
1868 }
1869
1870 if (ShenandoahAlwaysPreTouch) {
1871 if (!FLAG_IS_DEFAULT(ShenandoahUncommit)) {
1872 warning("AlwaysPreTouch is enabled, disabling ShenandoahUncommit");
1873 }
1874 FLAG_SET_DEFAULT(ShenandoahUncommit, false);
1875 }
1876
1877 if ((InitialHeapSize == MaxHeapSize) && ShenandoahUncommit) {
1878 if (PrintGC) {
1879 tty->print_cr("Min heap equals to max heap, disabling ShenandoahUncommit");
1880 }
1881 FLAG_SET_DEFAULT(ShenandoahUncommit, false);
1882 }
1883
1884 // If class unloading is disabled, no unloading for concurrent cycles as well.
1885 // If class unloading is enabled, users should opt-in for unloading during
1886 // concurrent cycles.
1887 if (!ClassUnloading || !FLAG_IS_CMDLINE(ClassUnloadingWithConcurrentMark)) {
1888 if (PrintGC) {
1889 tty->print_cr("Consider -XX:+ClassUnloadingWithConcurrentMark if large pause times "
1890 "are observed on class-unloading sensitive workloads");
1891 }
1892 FLAG_SET_DEFAULT(ClassUnloadingWithConcurrentMark, false);
1893 }
1894
1895 // TLAB sizing policy makes resizing decisions before each GC cycle. It averages
1896 // historical data, assigning more recent data the weight according to TLABAllocationWeight.
1897 // Current default is good for generational collectors that run frequent young GCs.
1898 // With Shenandoah, GC cycles are much less frequent, so we need we need sizing policy
1899 // to converge faster over smaller number of resizing decisions.
1900 if (FLAG_IS_DEFAULT(TLABAllocationWeight)) {
1901 FLAG_SET_DEFAULT(TLABAllocationWeight, 90);
1902 }
1903
1904 // Shenandoah needs more C2 nodes to compile some methods with lots of barriers.
1905 // NodeLimitFudgeFactor needs to stay the same relative to MaxNodeLimit.
1906 #ifdef COMPILER2
1907 if (FLAG_IS_DEFAULT(MaxNodeLimit)) {
1908 FLAG_SET_DEFAULT(MaxNodeLimit, MaxNodeLimit * 3);
1909 FLAG_SET_DEFAULT(NodeLimitFudgeFactor, NodeLimitFudgeFactor * 3);
1910 }
1911 #endif
1912 #endif
1913
1914 // Make sure safepoint deadlocks are failing predictably. This sets up VM to report
1915 // fatal error after 10 seconds of wait for safepoint syncronization (not the VM
1916 // operation itself). There is no good reason why Shenandoah would spend that
1917 // much time synchronizing.
1918 #ifdef ASSERT
1919 FLAG_SET_DEFAULT(SafepointTimeout, true);
1920 FLAG_SET_DEFAULT(SafepointTimeoutDelay, 10000);
1921 FLAG_SET_DEFAULT(AbortVMOnSafepointTimeout, true);
1922 #endif
1923 }
1924
1925 #if !INCLUDE_ALL_GCS
1926 #ifdef ASSERT
1927 static bool verify_serial_gc_flags() {
1928 return (UseSerialGC &&
1929 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1930 UseParallelGC || UseParallelOldGC));
1931 }
1932 #endif // ASSERT
1933 #endif // INCLUDE_ALL_GCS
1934
1935 void Arguments::set_gc_specific_flags() {
1936 #if INCLUDE_ALL_GCS
1937 // Set per-collector flags
1938 if (UseParallelGC || UseParallelOldGC) {
1939 set_parallel_gc_flags();
1940 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
1941 set_cms_and_parnew_gc_flags();
1942 } else if (UseParNewGC) { // Skipped if CMS is set above
1943 set_parnew_gc_flags();
1944 } else if (UseG1GC) {
1945 set_g1_gc_flags();
1946 } else if (UseShenandoahGC) {
1947 set_shenandoah_gc_flags();
1948 }
1949 check_deprecated_gcs();
1950 check_deprecated_gc_flags();
1951 if (AssumeMP && !UseSerialGC) {
1952 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1953 warning("If the number of processors is expected to increase from one, then"
1954 " you should configure the number of parallel GC threads appropriately"
1955 " using -XX:ParallelGCThreads=N");
1956 }
1957 }
1958 if (MinHeapFreeRatio == 100) {
1959 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1960 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1961 }
1962
1963 // If class unloading is disabled, also disable concurrent class unloading.
1964 if (!ClassUnloading) {
1965 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1966 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false);
1967 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1968 FLAG_SET_CMDLINE(uintx, ShenandoahUnloadClassesFrequency, 0);
1969 }
1970 #else // INCLUDE_ALL_GCS
1971 assert(verify_serial_gc_flags(), "SerialGC unset");
1972 #endif // INCLUDE_ALL_GCS
1973 }
1974
1975 julong Arguments::limit_by_allocatable_memory(julong limit) {
1976 julong max_allocatable;
1977 julong result = limit;
1978 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1979 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1980 }
1981 return result;
1982 }
1983
1984 void Arguments::set_heap_size() {
1985 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1986 // Deprecated flag
1987 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1988 }
1989
1990 julong phys_mem =
1991 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1992 : (julong)MaxRAM;
1993
1994 // Experimental support for CGroup memory limits
1995 if (UseCGroupMemoryLimitForHeap) {
1996 // This is a rough indicator that a CGroup limit may be in force
1997 // for this process
1998 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes";
1999 FILE *fp = fopen(lim_file, "r");
2000 if (fp != NULL) {
2001 julong cgroup_max = 0;
2002 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max);
2003 if (ret == 1 && cgroup_max > 0) {
2004 // If unlimited, cgroup_max will be a very large, but unspecified
2005 // value, so use initial phys_mem as a limit
2006 if (PrintGCDetails && Verbose) {
2007 // Cannot use gclog_or_tty yet.
2008 tty->print_cr("Setting phys_mem to the min of cgroup limit ("
2009 JULONG_FORMAT "MB) and initial phys_mem ("
2010 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M);
2011 }
2012 phys_mem = MIN2(cgroup_max, phys_mem);
2013 } else {
2014 warning("Unable to read/parse cgroup memory limit from %s: %s",
2015 lim_file, errno != 0 ? strerror(errno) : "unknown error");
2016 }
2017 fclose(fp);
2018 } else {
2019 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno));
2020 }
2021 }
2022
2023 // Convert Fraction to Precentage values
2024 if (FLAG_IS_DEFAULT(MaxRAMPercentage) &&
2025 !FLAG_IS_DEFAULT(MaxRAMFraction))
2026 MaxRAMPercentage = 100.0 / MaxRAMFraction;
2027
2028 if (FLAG_IS_DEFAULT(MinRAMPercentage) &&
2029 !FLAG_IS_DEFAULT(MinRAMFraction))
2030 MinRAMPercentage = 100.0 / MinRAMFraction;
2031
2032 if (FLAG_IS_DEFAULT(InitialRAMPercentage) &&
2033 !FLAG_IS_DEFAULT(InitialRAMFraction))
2034 InitialRAMPercentage = 100.0 / InitialRAMFraction;
2035
2036 // If the maximum heap size has not been set with -Xmx,
2037 // then set it as fraction of the size of physical memory,
2038 // respecting the maximum and minimum sizes of the heap.
2039 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2040 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100);
2041 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100);
2042 if (reasonable_min < MaxHeapSize) {
2043 // Small physical memory, so use a minimum fraction of it for the heap
2044 reasonable_max = reasonable_min;
2045 } else {
2046 // Not-small physical memory, so require a heap at least
2047 // as large as MaxHeapSize
2048 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
2049 }
2050
2051 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
2052 // Limit the heap size to ErgoHeapSizeLimit
2053 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
2054 }
2055 if (UseCompressedOops) {
2056 // Limit the heap size to the maximum possible when using compressed oops
2057 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
2058 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
2059 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
2060 // but it should be not less than default MaxHeapSize.
2061 max_coop_heap -= HeapBaseMinAddress;
2062 }
2063 reasonable_max = MIN2(reasonable_max, max_coop_heap);
2064 }
2065 reasonable_max = limit_by_allocatable_memory(reasonable_max);
2066
2067 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
2068 // An initial heap size was specified on the command line,
2069 // so be sure that the maximum size is consistent. Done
2070 // after call to limit_by_allocatable_memory because that
2071 // method might reduce the allocation size.
2072 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
2073 }
2074
2075 if (PrintGCDetails && Verbose) {
2076 // Cannot use gclog_or_tty yet.
2077 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
2078 }
2079 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
2080 }
2081
2082 // If the minimum or initial heap_size have not been set or requested to be set
2083 // ergonomically, set them accordingly.
2084 if (InitialHeapSize == 0 || min_heap_size() == 0) {
2085 julong reasonable_minimum = (julong)(OldSize + NewSize);
2086
2087 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
2088
2089 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
2090
2091 if (InitialHeapSize == 0) {
2092 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100);
2093
2094 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
2095 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
2096
2097 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
2098
2099 if (PrintGCDetails && Verbose) {
2100 // Cannot use gclog_or_tty yet.
2101 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
2102 }
2103 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
2104 }
2105 // If the minimum heap size has not been set (via -Xms),
2106 // synchronize with InitialHeapSize to avoid errors with the default value.
2107 if (min_heap_size() == 0) {
2108 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
2109 if (PrintGCDetails && Verbose) {
2110 // Cannot use gclog_or_tty yet.
2111 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
2112 }
2113 }
2114 }
2115 }
2116
2117 // This option inspects the machine and attempts to set various
2118 // parameters to be optimal for long-running, memory allocation
2119 // intensive jobs. It is intended for machines with large
2120 // amounts of cpu and memory.
2121 jint Arguments::set_aggressive_heap_flags() {
2122 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2123 // VM, but we may not be able to represent the total physical memory
2124 // available (like having 8gb of memory on a box but using a 32bit VM).
2125 // Thus, we need to make sure we're using a julong for intermediate
2126 // calculations.
2127 julong initHeapSize;
2128 julong total_memory = os::physical_memory();
2129
2130 if (total_memory < (julong) 256 * M) {
2131 jio_fprintf(defaultStream::error_stream(),
2132 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2133 vm_exit(1);
2134 }
2135
2136 // The heap size is half of available memory, or (at most)
2137 // all of possible memory less 160mb (leaving room for the OS
2138 // when using ISM). This is the maximum; because adaptive sizing
2139 // is turned on below, the actual space used may be smaller.
2140
2141 initHeapSize = MIN2(total_memory / (julong) 2,
2142 total_memory - (julong) 160 * M);
2143
2144 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2145
2146 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2147 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2148 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2149 // Currently the minimum size and the initial heap sizes are the same.
2150 set_min_heap_size(initHeapSize);
2151 }
2152 if (FLAG_IS_DEFAULT(NewSize)) {
2153 // Make the young generation 3/8ths of the total heap.
2154 FLAG_SET_CMDLINE(uintx, NewSize,
2155 ((julong) MaxHeapSize / (julong) 8) * (julong) 3);
2156 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2157 }
2158
2159 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2160 FLAG_SET_DEFAULT(UseLargePages, true);
2161 #endif
2162
2163 // Increase some data structure sizes for efficiency
2164 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2165 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2166 FLAG_SET_CMDLINE(uintx, TLABSize, 256 * K);
2167
2168 // See the OldPLABSize comment below, but replace 'after promotion'
2169 // with 'after copying'. YoungPLABSize is the size of the survivor
2170 // space per-gc-thread buffers. The default is 4kw.
2171 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256 * K); // Note: this is in words
2172
2173 // OldPLABSize is the size of the buffers in the old gen that
2174 // UseParallelGC uses to promote live data that doesn't fit in the
2175 // survivor spaces. At any given time, there's one for each gc thread.
2176 // The default size is 1kw. These buffers are rarely used, since the
2177 // survivor spaces are usually big enough. For specjbb, however, there
2178 // are occasions when there's lots of live data in the young gen
2179 // and we end up promoting some of it. We don't have a definite
2180 // explanation for why bumping OldPLABSize helps, but the theory
2181 // is that a bigger PLAB results in retaining something like the
2182 // original allocation order after promotion, which improves mutator
2183 // locality. A minor effect may be that larger PLABs reduce the
2184 // number of PLAB allocation events during gc. The value of 8kw
2185 // was arrived at by experimenting with specjbb.
2186 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8 * K); // Note: this is in words
2187
2188 // Enable parallel GC and adaptive generation sizing
2189 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2190
2191 // Encourage steady state memory management
2192 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2193
2194 // This appears to improve mutator locality
2195 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2196
2197 // Get around early Solaris scheduling bug
2198 // (affinity vs other jobs on system)
2199 // but disallow DR and offlining (5008695).
2200 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2201
2202 return JNI_OK;
2203 }
2204
2205 // This must be called after ergonomics because we want bytecode rewriting
2206 // if the server compiler is used, or if UseSharedSpaces is disabled.
2207 void Arguments::set_bytecode_flags() {
2208 // Better not attempt to store into a read-only space.
2209 if (UseSharedSpaces) {
2210 FLAG_SET_DEFAULT(RewriteBytecodes, false);
2211 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2212 }
2213
2214 if (!RewriteBytecodes) {
2215 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2216 }
2217 }
2218
2219 // Aggressive optimization flags -XX:+AggressiveOpts
2220 void Arguments::set_aggressive_opts_flags() {
2221 #ifdef COMPILER2
2222 if (AggressiveUnboxing) {
2223 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2224 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2225 } else if (!EliminateAutoBox) {
2226 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2227 AggressiveUnboxing = false;
2228 }
2229 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2230 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2231 } else if (!DoEscapeAnalysis) {
2232 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2233 AggressiveUnboxing = false;
2234 }
2235 }
2236 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2237 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2238 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2239 }
2240 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2241 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2242 }
2243
2244 // Feed the cache size setting into the JDK
2245 char buffer[1024];
2246 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2247 add_property(buffer);
2248 }
2249 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2250 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2251 }
2252 #endif
2253
2254 if (AggressiveOpts) {
2255 // Sample flag setting code
2256 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2257 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2258 // }
2259 }
2260 }
2261
2262 //===========================================================================================================
2263 // Parsing of java.compiler property
2264
2265 void Arguments::process_java_compiler_argument(char* arg) {
2266 // For backwards compatibility, Djava.compiler=NONE or ""
2267 // causes us to switch to -Xint mode UNLESS -Xdebug
2268 // is also specified.
2269 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2270 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2271 }
2272 }
2273
2274 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2275 _sun_java_launcher = strdup(launcher);
2276 if (strcmp("gamma", _sun_java_launcher) == 0) {
2277 _created_by_gamma_launcher = true;
2278 }
2279 }
2280
2281 bool Arguments::created_by_java_launcher() {
2282 assert(_sun_java_launcher != NULL, "property must have value");
2283 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2284 }
2285
2286 bool Arguments::created_by_gamma_launcher() {
2287 return _created_by_gamma_launcher;
2288 }
2289
2290 //===========================================================================================================
2291 // Parsing of main arguments
2292
2293 bool Arguments::verify_interval(uintx val, uintx min,
2294 uintx max, const char* name) {
2295 // Returns true iff value is in the inclusive interval [min..max]
2296 // false, otherwise.
2297 if (val >= min && val <= max) {
2298 return true;
2299 }
2300 jio_fprintf(defaultStream::error_stream(),
2301 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
2302 " and " UINTX_FORMAT "\n",
2303 name, val, min, max);
2304 return false;
2305 }
2306
2307 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
2308 // Returns true if given value is at least specified min threshold
2309 // false, otherwise.
2310 if (val >= min ) {
2311 return true;
2312 }
2313 jio_fprintf(defaultStream::error_stream(),
2314 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
2315 name, val, min);
2316 return false;
2317 }
2318
2319 bool Arguments::verify_percentage(uintx value, const char* name) {
2320 if (is_percentage(value)) {
2321 return true;
2322 }
2323 jio_fprintf(defaultStream::error_stream(),
2324 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
2325 name, value);
2326 return false;
2327 }
2328
2329 // check if do gclog rotation
2330 // +UseGCLogFileRotation is a must,
2331 // no gc log rotation when log file not supplied or
2332 // NumberOfGCLogFiles is 0
2333 void check_gclog_consistency() {
2334 if (UseGCLogFileRotation) {
2335 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2336 jio_fprintf(defaultStream::output_stream(),
2337 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2338 "where num_of_file > 0\n"
2339 "GC log rotation is turned off\n");
2340 UseGCLogFileRotation = false;
2341 }
2342 }
2343
2344 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2345 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
2346 jio_fprintf(defaultStream::output_stream(),
2347 "GCLogFileSize changed to minimum 8K\n");
2348 }
2349
2350 // Record more information about previous cycles for improved debugging pleasure
2351 if (FLAG_IS_DEFAULT(LogEventsBufferEntries)) {
2352 FLAG_SET_DEFAULT(LogEventsBufferEntries, 250);
2353 }
2354
2355 #if INCLUDE_ALL_GCS
2356 if (AlwaysPreTouch || ShenandoahAlwaysPreTouch) {
2357 if (!FLAG_IS_DEFAULT(ShenandoahUncommitDelay)) {
2358 warning("AlwaysPreTouch is enabled, disabling ShenandoahUncommitDelay");
2359 }
2360 FLAG_SET_DEFAULT(ShenandoahUncommitDelay, max_uintx);
2361 }
2362 #endif
2363 }
2364
2365 // This function is called for -Xloggc:<filename>, it can be used
2366 // to check if a given file name(or string) conforms to the following
2367 // specification:
2368 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2369 // %p and %t only allowed once. We only limit usage of filename not path
2370 bool is_filename_valid(const char *file_name) {
2371 const char* p = file_name;
2372 char file_sep = os::file_separator()[0];
2373 const char* cp;
2374 // skip prefix path
2375 for (cp = file_name; *cp != '\0'; cp++) {
2376 if (*cp == '/' || *cp == file_sep) {
2377 p = cp + 1;
2378 }
2379 }
2380
2381 int count_p = 0;
2382 int count_t = 0;
2383 while (*p != '\0') {
2384 if ((*p >= '0' && *p <= '9') ||
2385 (*p >= 'A' && *p <= 'Z') ||
2386 (*p >= 'a' && *p <= 'z') ||
2387 *p == '-' ||
2388 *p == '_' ||
2389 *p == '.') {
2390 p++;
2391 continue;
2392 }
2393 if (*p == '%') {
2394 if(*(p + 1) == 'p') {
2395 p += 2;
2396 count_p ++;
2397 continue;
2398 }
2399 if (*(p + 1) == 't') {
2400 p += 2;
2401 count_t ++;
2402 continue;
2403 }
2404 }
2405 return false;
2406 }
2407 return count_p < 2 && count_t < 2;
2408 }
2409
2410 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2411 if (!is_percentage(min_heap_free_ratio)) {
2412 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2413 return false;
2414 }
2415 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2416 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2417 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2418 MaxHeapFreeRatio);
2419 return false;
2420 }
2421 // This does not set the flag itself, but stores the value in a safe place for later usage.
2422 _min_heap_free_ratio = min_heap_free_ratio;
2423 return true;
2424 }
2425
2426 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2427 if (!is_percentage(max_heap_free_ratio)) {
2428 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2429 return false;
2430 }
2431 if (max_heap_free_ratio < MinHeapFreeRatio) {
2432 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2433 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2434 MinHeapFreeRatio);
2435 return false;
2436 }
2437 // This does not set the flag itself, but stores the value in a safe place for later usage.
2438 _max_heap_free_ratio = max_heap_free_ratio;
2439 return true;
2440 }
2441
2442 // Check consistency of GC selection
2443 bool Arguments::check_gc_consistency() {
2444 check_gclog_consistency();
2445 bool status = true;
2446 // Ensure that the user has not selected conflicting sets
2447 // of collectors. [Note: this check is merely a user convenience;
2448 // collectors over-ride each other so that only a non-conflicting
2449 // set is selected; however what the user gets is not what they
2450 // may have expected from the combination they asked for. It's
2451 // better to reduce user confusion by not allowing them to
2452 // select conflicting combinations.
2453 uint i = 0;
2454 if (UseSerialGC) i++;
2455 if (UseConcMarkSweepGC || UseParNewGC) i++;
2456 if (UseParallelGC || UseParallelOldGC) i++;
2457 if (UseG1GC) i++;
2458 if (UseShenandoahGC) i++;
2459 if (i > 1) {
2460 jio_fprintf(defaultStream::error_stream(),
2461 "Conflicting collector combinations in option list; "
2462 "please refer to the release notes for the combinations "
2463 "allowed\n");
2464 status = false;
2465 }
2466 return status;
2467 }
2468
2469 void Arguments::check_deprecated_gcs() {
2470 if (UseConcMarkSweepGC && !UseParNewGC) {
2471 warning("Using the DefNew young collector with the CMS collector is deprecated "
2472 "and will likely be removed in a future release");
2473 }
2474
2475 if (UseParNewGC && !UseConcMarkSweepGC) {
2476 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2477 // set up UseSerialGC properly, so that can't be used in the check here.
2478 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2479 "and will likely be removed in a future release");
2480 }
2481
2482 if (CMSIncrementalMode) {
2483 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2484 }
2485 }
2486
2487 void Arguments::check_deprecated_gc_flags() {
2488 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2489 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2490 "and will likely be removed in future release");
2491 }
2492 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2493 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2494 "Use MaxRAMFraction instead.");
2495 }
2496 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2497 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2498 }
2499 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2500 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2501 }
2502 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2503 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2504 }
2505 }
2506
2507 // Check stack pages settings
2508 bool Arguments::check_stack_pages()
2509 {
2510 bool status = true;
2511 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2512 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2513 // greater stack shadow pages can't generate instruction to bang stack
2514 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2515 return status;
2516 }
2517
2518 // Check the consistency of vm_init_args
2519 bool Arguments::check_vm_args_consistency() {
2520 // Method for adding checks for flag consistency.
2521 // The intent is to warn the user of all possible conflicts,
2522 // before returning an error.
2523 // Note: Needs platform-dependent factoring.
2524 bool status = true;
2525
2526 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2527 // builds so the cost of stack banging can be measured.
2528 #if (defined(PRODUCT) && defined(SOLARIS))
2529 if (!UseBoundThreads && !UseStackBanging) {
2530 jio_fprintf(defaultStream::error_stream(),
2531 "-UseStackBanging conflicts with -UseBoundThreads\n");
2532
2533 status = false;
2534 }
2535 #endif
2536
2537 if (TLABRefillWasteFraction == 0) {
2538 jio_fprintf(defaultStream::error_stream(),
2539 "TLABRefillWasteFraction should be a denominator, "
2540 "not " SIZE_FORMAT "\n",
2541 TLABRefillWasteFraction);
2542 status = false;
2543 }
2544
2545 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2546 "AdaptiveSizePolicyWeight");
2547 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2548
2549 // Divide by bucket size to prevent a large size from causing rollover when
2550 // calculating amount of memory needed to be allocated for the String table.
2551 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2552 (max_uintx / StringTable::bucket_size()), "StringTable size");
2553
2554 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2555 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2556
2557 {
2558 // Using "else if" below to avoid printing two error messages if min > max.
2559 // This will also prevent us from reporting both min>100 and max>100 at the
2560 // same time, but that is less annoying than printing two identical errors IMHO.
2561 FormatBuffer<80> err_msg("%s","");
2562 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2563 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2564 status = false;
2565 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2566 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2567 status = false;
2568 }
2569 }
2570
2571 // Min/MaxMetaspaceFreeRatio
2572 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2573 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2574
2575 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2576 jio_fprintf(defaultStream::error_stream(),
2577 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2578 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2579 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2580 MinMetaspaceFreeRatio,
2581 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2582 MaxMetaspaceFreeRatio);
2583 status = false;
2584 }
2585
2586 // Trying to keep 100% free is not practical
2587 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2588
2589 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2590 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2591 }
2592
2593 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2594 // Settings to encourage splitting.
2595 if (!FLAG_IS_CMDLINE(NewRatio)) {
2596 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2597 }
2598 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2599 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2600 }
2601 }
2602
2603 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2604 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2605 if (GCTimeLimit == 100) {
2606 // Turn off gc-overhead-limit-exceeded checks
2607 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2608 }
2609
2610 status = status && check_gc_consistency();
2611 status = status && check_stack_pages();
2612
2613 if (CMSIncrementalMode) {
2614 if (!UseConcMarkSweepGC) {
2615 jio_fprintf(defaultStream::error_stream(),
2616 "error: invalid argument combination.\n"
2617 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2618 "selected in order\nto use CMSIncrementalMode.\n");
2619 status = false;
2620 } else {
2621 status = status && verify_percentage(CMSIncrementalDutyCycle,
2622 "CMSIncrementalDutyCycle");
2623 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2624 "CMSIncrementalDutyCycleMin");
2625 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2626 "CMSIncrementalSafetyFactor");
2627 status = status && verify_percentage(CMSIncrementalOffset,
2628 "CMSIncrementalOffset");
2629 status = status && verify_percentage(CMSExpAvgFactor,
2630 "CMSExpAvgFactor");
2631 // If it was not set on the command line, set
2632 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2633 if (CMSInitiatingOccupancyFraction < 0) {
2634 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2635 }
2636 }
2637 }
2638
2639 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2640 // insists that we hold the requisite locks so that the iteration is
2641 // MT-safe. For the verification at start-up and shut-down, we don't
2642 // yet have a good way of acquiring and releasing these locks,
2643 // which are not visible at the CollectedHeap level. We want to
2644 // be able to acquire these locks and then do the iteration rather
2645 // than just disable the lock verification. This will be fixed under
2646 // bug 4788986.
2647 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2648 if (VerifyDuringStartup) {
2649 warning("Heap verification at start-up disabled "
2650 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2651 VerifyDuringStartup = false; // Disable verification at start-up
2652 }
2653
2654 if (VerifyBeforeExit) {
2655 warning("Heap verification at shutdown disabled "
2656 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2657 VerifyBeforeExit = false; // Disable verification at shutdown
2658 }
2659 }
2660
2661 // Note: only executed in non-PRODUCT mode
2662 if (!UseAsyncConcMarkSweepGC &&
2663 (ExplicitGCInvokesConcurrent ||
2664 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2665 jio_fprintf(defaultStream::error_stream(),
2666 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2667 " with -UseAsyncConcMarkSweepGC");
2668 status = false;
2669 }
2670
2671 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2672
2673 #if INCLUDE_ALL_GCS
2674 if (UseG1GC) {
2675 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2676 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2677 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2678
2679 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2680 "InitiatingHeapOccupancyPercent");
2681 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2682 "G1RefProcDrainInterval");
2683 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2684 "G1ConcMarkStepDurationMillis");
2685 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2686 "G1ConcRSHotCardLimit");
2687 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2688 "G1ConcRSLogCacheSize");
2689 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2690 "StringDeduplicationAgeThreshold");
2691 }
2692 if (UseConcMarkSweepGC) {
2693 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2694 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2695 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2696 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2697
2698 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2699
2700 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2701 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2702 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2703
2704 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2705
2706 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2707 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2708
2709 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2710 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2711 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2712
2713 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2714
2715 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2716
2717 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2718 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2719 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2720 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2721 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2722 }
2723
2724 if (UseParallelGC || UseParallelOldGC) {
2725 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2726 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2727
2728 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2729 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2730
2731 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2732 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2733
2734 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2735
2736 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2737 }
2738 #endif // INCLUDE_ALL_GCS
2739
2740 status = status && verify_interval(RefDiscoveryPolicy,
2741 ReferenceProcessor::DiscoveryPolicyMin,
2742 ReferenceProcessor::DiscoveryPolicyMax,
2743 "RefDiscoveryPolicy");
2744
2745 // Limit the lower bound of this flag to 1 as it is used in a division
2746 // expression.
2747 status = status && verify_interval(TLABWasteTargetPercent,
2748 1, 100, "TLABWasteTargetPercent");
2749
2750 status = status && verify_object_alignment();
2751
2752 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2753 "CompressedClassSpaceSize");
2754
2755 status = status && verify_interval(MarkStackSizeMax,
2756 1, (max_jint - 1), "MarkStackSizeMax");
2757 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2758
2759 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2760
2761 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2762
2763 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2764
2765 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2766 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2767
2768 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2769
2770 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2771 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2772 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2773 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2774
2775 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2776 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2777
2778 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2779 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2780 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2781
2782 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2783 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2784
2785 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2786 // just for that, so hardcode here.
2787 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2788 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2789 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2790 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2791
2792 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2793 #ifdef COMPILER1
2794 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2795 #endif
2796
2797 if (PrintNMTStatistics) {
2798 #if INCLUDE_NMT
2799 if (MemTracker::tracking_level() == NMT_off) {
2800 #endif // INCLUDE_NMT
2801 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2802 PrintNMTStatistics = false;
2803 #if INCLUDE_NMT
2804 }
2805 #endif
2806 }
2807
2808 // Need to limit the extent of the padding to reasonable size.
2809 // 8K is well beyond the reasonable HW cache line size, even with the
2810 // aggressive prefetching, while still leaving the room for segregating
2811 // among the distinct pages.
2812 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2813 jio_fprintf(defaultStream::error_stream(),
2814 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2815 ContendedPaddingWidth, 0, 8192);
2816 status = false;
2817 }
2818
2819 // Need to enforce the padding not to break the existing field alignments.
2820 // It is sufficient to check against the largest type size.
2821 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2822 jio_fprintf(defaultStream::error_stream(),
2823 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2824 ContendedPaddingWidth, BytesPerLong);
2825 status = false;
2826 }
2827
2828 // Check lower bounds of the code cache
2829 // Template Interpreter code is approximately 3X larger in debug builds.
2830 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2831 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2832 jio_fprintf(defaultStream::error_stream(),
2833 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2834 os::vm_page_size()/K);
2835 status = false;
2836 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2837 jio_fprintf(defaultStream::error_stream(),
2838 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2839 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2840 status = false;
2841 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2842 jio_fprintf(defaultStream::error_stream(),
2843 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2844 min_code_cache_size/K);
2845 status = false;
2846 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2847 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2848 jio_fprintf(defaultStream::error_stream(),
2849 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2850 CODE_CACHE_SIZE_LIMIT/M);
2851 status = false;
2852 }
2853
2854 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2855 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2856
2857 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2858 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2859 }
2860
2861 #ifdef COMPILER1
2862 status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset");
2863 #endif
2864
2865 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2866 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2867 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2868 // Check the minimum number of compiler threads
2869 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2870
2871 return status;
2872 }
2873
2874 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2875 const char* option_type) {
2876 if (ignore) return false;
2877
2878 const char* spacer = " ";
2879 if (option_type == NULL) {
2880 option_type = ++spacer; // Set both to the empty string.
2881 }
2882
2883 if (os::obsolete_option(option)) {
2884 jio_fprintf(defaultStream::error_stream(),
2885 "Obsolete %s%soption: %s\n", option_type, spacer,
2886 option->optionString);
2887 return false;
2888 } else {
2889 jio_fprintf(defaultStream::error_stream(),
2890 "Unrecognized %s%soption: %s\n", option_type, spacer,
2891 option->optionString);
2892 return true;
2893 }
2894 }
2895
2896 static const char* user_assertion_options[] = {
2897 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2898 };
2899
2900 static const char* system_assertion_options[] = {
2901 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2902 };
2903
2904 // Return true if any of the strings in null-terminated array 'names' matches.
2905 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2906 // the option must match exactly.
2907 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2908 bool tail_allowed) {
2909 for (/* empty */; *names != NULL; ++names) {
2910 if (match_option(option, *names, tail)) {
2911 if (**tail == '\0' || tail_allowed && **tail == ':') {
2912 return true;
2913 }
2914 }
2915 }
2916 return false;
2917 }
2918
2919 bool Arguments::parse_uintx(const char* value,
2920 uintx* uintx_arg,
2921 uintx min_size) {
2922
2923 // Check the sign first since atomull() parses only unsigned values.
2924 bool value_is_positive = !(*value == '-');
2925
2926 if (value_is_positive) {
2927 julong n;
2928 bool good_return = atomull(value, &n);
2929 if (good_return) {
2930 bool above_minimum = n >= min_size;
2931 bool value_is_too_large = n > max_uintx;
2932
2933 if (above_minimum && !value_is_too_large) {
2934 *uintx_arg = n;
2935 return true;
2936 }
2937 }
2938 }
2939 return false;
2940 }
2941
2942 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2943 julong* long_arg,
2944 julong min_size) {
2945 if (!atomull(s, long_arg)) return arg_unreadable;
2946 return check_memory_size(*long_arg, min_size);
2947 }
2948
2949 // Parse JavaVMInitArgs structure
2950
2951 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2952 // For components of the system classpath.
2953 SysClassPath scp(Arguments::get_sysclasspath());
2954 bool scp_assembly_required = false;
2955
2956 // Save default settings for some mode flags
2957 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2958 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2959 Arguments::_ClipInlining = ClipInlining;
2960 Arguments::_BackgroundCompilation = BackgroundCompilation;
2961
2962 // Setup flags for mixed which is the default
2963 set_mode_flags(_mixed);
2964
2965 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2966 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2967 if (result != JNI_OK) {
2968 return result;
2969 }
2970
2971 // Parse JavaVMInitArgs structure passed in
2972 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2973 if (result != JNI_OK) {
2974 return result;
2975 }
2976
2977 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2978 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2979 if (result != JNI_OK) {
2980 return result;
2981 }
2982
2983 // We need to ensure processor and memory resources have been properly
2984 // configured - which may rely on arguments we just processed - before
2985 // doing the final argument processing. Any argument processing that
2986 // needs to know about processor and memory resources must occur after
2987 // this point.
2988
2989 os::init_container_support();
2990
2991 // Do final processing now that all arguments have been parsed
2992 result = finalize_vm_init_args(&scp, scp_assembly_required);
2993 if (result != JNI_OK) {
2994 return result;
2995 }
2996
2997 return JNI_OK;
2998 }
2999
3000 // Checks if name in command-line argument -agent{lib,path}:name[=options]
3001 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
3002 // are dealing with -agentpath (case where name is a path), otherwise with
3003 // -agentlib
3004 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
3005 char *_name;
3006 const char *_hprof = "hprof", *_jdwp = "jdwp";
3007 size_t _len_hprof, _len_jdwp, _len_prefix;
3008
3009 if (is_path) {
3010 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
3011 return false;
3012 }
3013
3014 _name++; // skip past last path separator
3015 _len_prefix = strlen(JNI_LIB_PREFIX);
3016
3017 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
3018 return false;
3019 }
3020
3021 _name += _len_prefix;
3022 _len_hprof = strlen(_hprof);
3023 _len_jdwp = strlen(_jdwp);
3024
3025 if (strncmp(_name, _hprof, _len_hprof) == 0) {
3026 _name += _len_hprof;
3027 }
3028 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
3029 _name += _len_jdwp;
3030 }
3031 else {
3032 return false;
3033 }
3034
3035 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
3036 return false;
3037 }
3038
3039 return true;
3040 }
3041
3042 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
3043 return true;
3044 }
3045
3046 return false;
3047 }
3048
3049 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
3050 SysClassPath* scp_p,
3051 bool* scp_assembly_required_p,
3052 Flag::Flags origin) {
3053 // Remaining part of option string
3054 const char* tail;
3055
3056 // iterate over arguments
3057 for (int index = 0; index < args->nOptions; index++) {
3058 bool is_absolute_path = false; // for -agentpath vs -agentlib
3059
3060 const JavaVMOption* option = args->options + index;
3061
3062 if (!match_option(option, "-Djava.class.path", &tail) &&
3063 !match_option(option, "-Dsun.java.command", &tail) &&
3064 !match_option(option, "-Dsun.java.launcher", &tail)) {
3065
3066 // add all jvm options to the jvm_args string. This string
3067 // is used later to set the java.vm.args PerfData string constant.
3068 // the -Djava.class.path and the -Dsun.java.command options are
3069 // omitted from jvm_args string as each have their own PerfData
3070 // string constant object.
3071 build_jvm_args(option->optionString);
3072 }
3073
3074 // -verbose:[class/gc/jni]
3075 if (match_option(option, "-verbose", &tail)) {
3076 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
3077 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
3078 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
3079 } else if (!strcmp(tail, ":gc")) {
3080 FLAG_SET_CMDLINE(bool, PrintGC, true);
3081 } else if (!strcmp(tail, ":jni")) {
3082 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
3083 }
3084 // -da / -ea / -disableassertions / -enableassertions
3085 // These accept an optional class/package name separated by a colon, e.g.,
3086 // -da:java.lang.Thread.
3087 } else if (match_option(option, user_assertion_options, &tail, true)) {
3088 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
3089 if (*tail == '\0') {
3090 JavaAssertions::setUserClassDefault(enable);
3091 } else {
3092 assert(*tail == ':', "bogus match by match_option()");
3093 JavaAssertions::addOption(tail + 1, enable);
3094 }
3095 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
3096 } else if (match_option(option, system_assertion_options, &tail, false)) {
3097 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
3098 JavaAssertions::setSystemClassDefault(enable);
3099 // -bootclasspath:
3100 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
3101 scp_p->reset_path(tail);
3102 *scp_assembly_required_p = true;
3103 // -bootclasspath/a:
3104 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
3105 scp_p->add_suffix(tail);
3106 *scp_assembly_required_p = true;
3107 // -bootclasspath/p:
3108 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
3109 scp_p->add_prefix(tail);
3110 *scp_assembly_required_p = true;
3111 // -Xrun
3112 } else if (match_option(option, "-Xrun", &tail)) {
3113 if (tail != NULL) {
3114 const char* pos = strchr(tail, ':');
3115 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
3116 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
3117 name[len] = '\0';
3118
3119 char *options = NULL;
3120 if(pos != NULL) {
3121 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
3122 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
3123 }
3124 #if !INCLUDE_JVMTI
3125 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
3126 jio_fprintf(defaultStream::error_stream(),
3127 "Profiling and debugging agents are not supported in this VM\n");
3128 return JNI_ERR;
3129 }
3130 #endif // !INCLUDE_JVMTI
3131 add_init_library(name, options);
3132 }
3133 // -agentlib and -agentpath
3134 } else if (match_option(option, "-agentlib:", &tail) ||
3135 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
3136 if(tail != NULL) {
3137 const char* pos = strchr(tail, '=');
3138 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
3139 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
3140 name[len] = '\0';
3141
3142 char *options = NULL;
3143 if(pos != NULL) {
3144 size_t length = strlen(pos + 1) + 1;
3145 options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
3146 jio_snprintf(options, length, "%s", pos + 1);
3147 }
3148 #if !INCLUDE_JVMTI
3149 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
3150 jio_fprintf(defaultStream::error_stream(),
3151 "Profiling and debugging agents are not supported in this VM\n");
3152 return JNI_ERR;
3153 }
3154 #endif // !INCLUDE_JVMTI
3155 add_init_agent(name, options, is_absolute_path);
3156 }
3157 // -javaagent
3158 } else if (match_option(option, "-javaagent:", &tail)) {
3159 #if !INCLUDE_JVMTI
3160 jio_fprintf(defaultStream::error_stream(),
3161 "Instrumentation agents are not supported in this VM\n");
3162 return JNI_ERR;
3163 #else
3164 if(tail != NULL) {
3165 size_t length = strlen(tail) + 1;
3166 char *options = NEW_C_HEAP_ARRAY(char, length, mtInternal);
3167 jio_snprintf(options, length, "%s", tail);
3168 add_init_agent("instrument", options, false);
3169 }
3170 #endif // !INCLUDE_JVMTI
3171 // -Xnoclassgc
3172 } else if (match_option(option, "-Xnoclassgc", &tail)) {
3173 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
3174 // -Xincgc: i-CMS
3175 } else if (match_option(option, "-Xincgc", &tail)) {
3176 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
3177 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
3178 // -Xnoincgc: no i-CMS
3179 } else if (match_option(option, "-Xnoincgc", &tail)) {
3180 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
3181 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
3182 // -Xconcgc
3183 } else if (match_option(option, "-Xconcgc", &tail)) {
3184 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
3185 // -Xnoconcgc
3186 } else if (match_option(option, "-Xnoconcgc", &tail)) {
3187 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
3188 // -Xbatch
3189 } else if (match_option(option, "-Xbatch", &tail)) {
3190 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3191 // -Xmn for compatibility with other JVM vendors
3192 } else if (match_option(option, "-Xmn", &tail)) {
3193 julong long_initial_young_size = 0;
3194 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
3195 if (errcode != arg_in_range) {
3196 jio_fprintf(defaultStream::error_stream(),
3197 "Invalid initial young generation size: %s\n", option->optionString);
3198 describe_range_error(errcode);
3199 return JNI_EINVAL;
3200 }
3201 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
3202 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
3203 // -Xms
3204 } else if (match_option(option, "-Xms", &tail)) {
3205 julong long_initial_heap_size = 0;
3206 // an initial heap size of 0 means automatically determine
3207 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
3208 if (errcode != arg_in_range) {
3209 jio_fprintf(defaultStream::error_stream(),
3210 "Invalid initial heap size: %s\n", option->optionString);
3211 describe_range_error(errcode);
3212 return JNI_EINVAL;
3213 }
3214 set_min_heap_size((uintx)long_initial_heap_size);
3215 // Currently the minimum size and the initial heap sizes are the same.
3216 // Can be overridden with -XX:InitialHeapSize.
3217 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
3218 // -Xmx
3219 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
3220 julong long_max_heap_size = 0;
3221 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
3222 if (errcode != arg_in_range) {
3223 jio_fprintf(defaultStream::error_stream(),
3224 "Invalid maximum heap size: %s\n", option->optionString);
3225 describe_range_error(errcode);
3226 return JNI_EINVAL;
3227 }
3228 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
3229 // Xmaxf
3230 } else if (match_option(option, "-Xmaxf", &tail)) {
3231 char* err;
3232 int maxf = (int)(strtod(tail, &err) * 100);
3233 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
3234 jio_fprintf(defaultStream::error_stream(),
3235 "Bad max heap free percentage size: %s\n",
3236 option->optionString);
3237 return JNI_EINVAL;
3238 } else {
3239 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
3240 }
3241 // Xminf
3242 } else if (match_option(option, "-Xminf", &tail)) {
3243 char* err;
3244 int minf = (int)(strtod(tail, &err) * 100);
3245 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
3246 jio_fprintf(defaultStream::error_stream(),
3247 "Bad min heap free percentage size: %s\n",
3248 option->optionString);
3249 return JNI_EINVAL;
3250 } else {
3251 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
3252 }
3253 // -Xss
3254 } else if (match_option(option, "-Xss", &tail)) {
3255 julong long_ThreadStackSize = 0;
3256 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
3257 if (errcode != arg_in_range) {
3258 jio_fprintf(defaultStream::error_stream(),
3259 "Invalid thread stack size: %s\n", option->optionString);
3260 describe_range_error(errcode);
3261 return JNI_EINVAL;
3262 }
3263 // Internally track ThreadStackSize in units of 1024 bytes.
3264 FLAG_SET_CMDLINE(intx, ThreadStackSize,
3265 round_to((int)long_ThreadStackSize, K) / K);
3266 // -Xoss
3267 } else if (match_option(option, "-Xoss", &tail)) {
3268 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
3269 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
3270 julong long_CodeCacheExpansionSize = 0;
3271 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
3272 if (errcode != arg_in_range) {
3273 jio_fprintf(defaultStream::error_stream(),
3274 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
3275 os::vm_page_size()/K);
3276 return JNI_EINVAL;
3277 }
3278 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
3279 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
3280 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
3281 julong long_ReservedCodeCacheSize = 0;
3282
3283 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
3284 if (errcode != arg_in_range) {
3285 jio_fprintf(defaultStream::error_stream(),
3286 "Invalid maximum code cache size: %s.\n", option->optionString);
3287 return JNI_EINVAL;
3288 }
3289 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
3290 //-XX:IncreaseFirstTierCompileThresholdAt=
3291 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
3292 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
3293 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
3294 jio_fprintf(defaultStream::error_stream(),
3295 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
3296 option->optionString);
3297 return JNI_EINVAL;
3298 }
3299 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
3300 // -green
3301 } else if (match_option(option, "-green", &tail)) {
3302 jio_fprintf(defaultStream::error_stream(),
3303 "Green threads support not available\n");
3304 return JNI_EINVAL;
3305 // -native
3306 } else if (match_option(option, "-native", &tail)) {
3307 // HotSpot always uses native threads, ignore silently for compatibility
3308 // -Xsqnopause
3309 } else if (match_option(option, "-Xsqnopause", &tail)) {
3310 // EVM option, ignore silently for compatibility
3311 // -Xrs
3312 } else if (match_option(option, "-Xrs", &tail)) {
3313 // Classic/EVM option, new functionality
3314 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
3315 } else if (match_option(option, "-Xusealtsigs", &tail)) {
3316 // change default internal VM signals used - lower case for back compat
3317 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
3318 // -Xoptimize
3319 } else if (match_option(option, "-Xoptimize", &tail)) {
3320 // EVM option, ignore silently for compatibility
3321 // -Xprof
3322 } else if (match_option(option, "-Xprof", &tail)) {
3323 #if INCLUDE_FPROF
3324 _has_profile = true;
3325 #else // INCLUDE_FPROF
3326 jio_fprintf(defaultStream::error_stream(),
3327 "Flat profiling is not supported in this VM.\n");
3328 return JNI_ERR;
3329 #endif // INCLUDE_FPROF
3330 // -Xconcurrentio
3331 } else if (match_option(option, "-Xconcurrentio", &tail)) {
3332 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
3333 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
3334 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
3335 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3336 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
3337
3338 // -Xinternalversion
3339 } else if (match_option(option, "-Xinternalversion", &tail)) {
3340 jio_fprintf(defaultStream::output_stream(), "%s\n",
3341 VM_Version::internal_vm_info_string());
3342 vm_exit(0);
3343 #ifndef PRODUCT
3344 // -Xprintflags
3345 } else if (match_option(option, "-Xprintflags", &tail)) {
3346 CommandLineFlags::printFlags(tty, false);
3347 vm_exit(0);
3348 #endif
3349 // -D
3350 } else if (match_option(option, "-D", &tail)) {
3351 if (CheckEndorsedAndExtDirs) {
3352 if (match_option(option, "-Djava.endorsed.dirs=", &tail)) {
3353 // abort if -Djava.endorsed.dirs is set
3354 jio_fprintf(defaultStream::output_stream(),
3355 "-Djava.endorsed.dirs will not be supported in a future release.\n"
3356 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3357 return JNI_EINVAL;
3358 }
3359 if (match_option(option, "-Djava.ext.dirs=", &tail)) {
3360 // abort if -Djava.ext.dirs is set
3361 jio_fprintf(defaultStream::output_stream(),
3362 "-Djava.ext.dirs will not be supported in a future release.\n"
3363 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3364 return JNI_EINVAL;
3365 }
3366 }
3367
3368 if (!add_property(tail)) {
3369 return JNI_ENOMEM;
3370 }
3371 // Out of the box management support
3372 if (match_option(option, "-Dcom.sun.management", &tail)) {
3373 #if INCLUDE_MANAGEMENT
3374 FLAG_SET_CMDLINE(bool, ManagementServer, true);
3375 #else
3376 jio_fprintf(defaultStream::output_stream(),
3377 "-Dcom.sun.management is not supported in this VM.\n");
3378 return JNI_ERR;
3379 #endif
3380 }
3381 // -Xint
3382 } else if (match_option(option, "-Xint", &tail)) {
3383 set_mode_flags(_int);
3384 // -Xmixed
3385 } else if (match_option(option, "-Xmixed", &tail)) {
3386 set_mode_flags(_mixed);
3387 // -Xcomp
3388 } else if (match_option(option, "-Xcomp", &tail)) {
3389 // for testing the compiler; turn off all flags that inhibit compilation
3390 set_mode_flags(_comp);
3391 // -Xshare:dump
3392 } else if (match_option(option, "-Xshare:dump", &tail)) {
3393 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3394 set_mode_flags(_int); // Prevent compilation, which creates objects
3395 // -Xshare:on
3396 } else if (match_option(option, "-Xshare:on", &tail)) {
3397 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3398 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3399 // -Xshare:auto
3400 } else if (match_option(option, "-Xshare:auto", &tail)) {
3401 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3402 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3403 // -Xshare:off
3404 } else if (match_option(option, "-Xshare:off", &tail)) {
3405 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3406 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3407 // -Xverify
3408 } else if (match_option(option, "-Xverify", &tail)) {
3409 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3410 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3411 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3412 } else if (strcmp(tail, ":remote") == 0) {
3413 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3414 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3415 } else if (strcmp(tail, ":none") == 0) {
3416 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3417 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3418 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3419 return JNI_EINVAL;
3420 }
3421 // -Xdebug
3422 } else if (match_option(option, "-Xdebug", &tail)) {
3423 // note this flag has been used, then ignore
3424 set_xdebug_mode(true);
3425 // -Xnoagent
3426 } else if (match_option(option, "-Xnoagent", &tail)) {
3427 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3428 } else if (match_option(option, "-Xboundthreads", &tail)) {
3429 // Bind user level threads to kernel threads (Solaris only)
3430 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3431 } else if (match_option(option, "-Xloggc:", &tail)) {
3432 // Redirect GC output to the file. -Xloggc:<filename>
3433 // ostream_init_log(), when called will use this filename
3434 // to initialize a fileStream.
3435 _gc_log_filename = strdup(tail);
3436 if (!is_filename_valid(_gc_log_filename)) {
3437 jio_fprintf(defaultStream::output_stream(),
3438 "Invalid file name for use with -Xloggc: Filename can only contain the "
3439 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3440 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3441 return JNI_EINVAL;
3442 }
3443 FLAG_SET_CMDLINE(bool, PrintGC, true);
3444 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3445
3446 // JNI hooks
3447 } else if (match_option(option, "-Xcheck", &tail)) {
3448 if (!strcmp(tail, ":jni")) {
3449 #if !INCLUDE_JNI_CHECK
3450 warning("JNI CHECKING is not supported in this VM");
3451 #else
3452 CheckJNICalls = true;
3453 #endif // INCLUDE_JNI_CHECK
3454 } else if (is_bad_option(option, args->ignoreUnrecognized,
3455 "check")) {
3456 return JNI_EINVAL;
3457 }
3458 } else if (match_option(option, "vfprintf", &tail)) {
3459 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3460 } else if (match_option(option, "exit", &tail)) {
3461 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3462 } else if (match_option(option, "abort", &tail)) {
3463 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3464 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3465 // The last option must always win.
3466 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3467 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3468 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3469 // The last option must always win.
3470 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3471 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3472 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3473 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3474 jio_fprintf(defaultStream::error_stream(),
3475 "Please use CMSClassUnloadingEnabled in place of "
3476 "CMSPermGenSweepingEnabled in the future\n");
3477 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3478 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3479 jio_fprintf(defaultStream::error_stream(),
3480 "Please use -XX:+UseGCOverheadLimit in place of "
3481 "-XX:+UseGCTimeLimit in the future\n");
3482 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3483 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3484 jio_fprintf(defaultStream::error_stream(),
3485 "Please use -XX:-UseGCOverheadLimit in place of "
3486 "-XX:-UseGCTimeLimit in the future\n");
3487 // The TLE options are for compatibility with 1.3 and will be
3488 // removed without notice in a future release. These options
3489 // are not to be documented.
3490 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3491 // No longer used.
3492 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3493 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3494 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3495 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3496 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3497 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3498 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3499 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3500 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3501 // No longer used.
3502 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3503 julong long_tlab_size = 0;
3504 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3505 if (errcode != arg_in_range) {
3506 jio_fprintf(defaultStream::error_stream(),
3507 "Invalid TLAB size: %s\n", option->optionString);
3508 describe_range_error(errcode);
3509 return JNI_EINVAL;
3510 }
3511 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3512 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3513 // No longer used.
3514 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3515 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3516 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3517 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3518 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3519 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3520 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3521 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3522 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3523 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3524 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3525 #if defined(DTRACE_ENABLED)
3526 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3527 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3528 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3529 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3530 #else // defined(DTRACE_ENABLED)
3531 jio_fprintf(defaultStream::error_stream(),
3532 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3533 return JNI_EINVAL;
3534 #endif // defined(DTRACE_ENABLED)
3535 #ifdef ASSERT
3536 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3537 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3538 // disable scavenge before parallel mark-compact
3539 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3540 #endif
3541 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3542 julong cms_blocks_to_claim = (julong)atol(tail);
3543 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3544 jio_fprintf(defaultStream::error_stream(),
3545 "Please use -XX:OldPLABSize in place of "
3546 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3547 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3548 julong cms_blocks_to_claim = (julong)atol(tail);
3549 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3550 jio_fprintf(defaultStream::error_stream(),
3551 "Please use -XX:OldPLABSize in place of "
3552 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3553 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3554 julong old_plab_size = 0;
3555 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3556 if (errcode != arg_in_range) {
3557 jio_fprintf(defaultStream::error_stream(),
3558 "Invalid old PLAB size: %s\n", option->optionString);
3559 describe_range_error(errcode);
3560 return JNI_EINVAL;
3561 }
3562 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3563 jio_fprintf(defaultStream::error_stream(),
3564 "Please use -XX:OldPLABSize in place of "
3565 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3566 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3567 julong young_plab_size = 0;
3568 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3569 if (errcode != arg_in_range) {
3570 jio_fprintf(defaultStream::error_stream(),
3571 "Invalid young PLAB size: %s\n", option->optionString);
3572 describe_range_error(errcode);
3573 return JNI_EINVAL;
3574 }
3575 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3576 jio_fprintf(defaultStream::error_stream(),
3577 "Please use -XX:YoungPLABSize in place of "
3578 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3579 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3580 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3581 julong stack_size = 0;
3582 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3583 if (errcode != arg_in_range) {
3584 jio_fprintf(defaultStream::error_stream(),
3585 "Invalid mark stack size: %s\n", option->optionString);
3586 describe_range_error(errcode);
3587 return JNI_EINVAL;
3588 }
3589 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3590 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3591 julong max_stack_size = 0;
3592 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3593 if (errcode != arg_in_range) {
3594 jio_fprintf(defaultStream::error_stream(),
3595 "Invalid maximum mark stack size: %s\n",
3596 option->optionString);
3597 describe_range_error(errcode);
3598 return JNI_EINVAL;
3599 }
3600 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3601 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3602 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3603 uintx conc_threads = 0;
3604 if (!parse_uintx(tail, &conc_threads, 1)) {
3605 jio_fprintf(defaultStream::error_stream(),
3606 "Invalid concurrent threads: %s\n", option->optionString);
3607 return JNI_EINVAL;
3608 }
3609 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3610 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3611 julong max_direct_memory_size = 0;
3612 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3613 if (errcode != arg_in_range) {
3614 jio_fprintf(defaultStream::error_stream(),
3615 "Invalid maximum direct memory size: %s\n",
3616 option->optionString);
3617 describe_range_error(errcode);
3618 return JNI_EINVAL;
3619 }
3620 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3621 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3622 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3623 // away and will cause VM initialization failures!
3624 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3625 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3626 #if !INCLUDE_MANAGEMENT
3627 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3628 jio_fprintf(defaultStream::error_stream(),
3629 "ManagementServer is not supported in this VM.\n");
3630 return JNI_ERR;
3631 #endif // INCLUDE_MANAGEMENT
3632 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3633 // Skip -XX:Flags= since that case has already been handled
3634 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3635 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3636 return JNI_EINVAL;
3637 }
3638 }
3639 // Unknown option
3640 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3641 return JNI_ERR;
3642 }
3643 }
3644
3645 // PrintSharedArchiveAndExit will turn on
3646 // -Xshare:on
3647 // -XX:+TraceClassPaths
3648 if (PrintSharedArchiveAndExit) {
3649 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3650 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3651 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3652 }
3653
3654 // Change the default value for flags which have different default values
3655 // when working with older JDKs.
3656 #ifdef LINUX
3657 if (JDK_Version::current().compare_major(6) <= 0 &&
3658 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3659 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3660 }
3661 #endif // LINUX
3662 fix_appclasspath();
3663 return JNI_OK;
3664 }
3665
3666 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3667 //
3668 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3669 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3670 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3671 // path is treated as the current directory.
3672 //
3673 // This causes problems with CDS, which requires that all directories specified in the classpath
3674 // must be empty. In most cases, applications do NOT want to load classes from the current
3675 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3676 // scripts compatible with CDS.
3677 void Arguments::fix_appclasspath() {
3678 if (IgnoreEmptyClassPaths) {
3679 const char separator = *os::path_separator();
3680 const char* src = _java_class_path->value();
3681
3682 // skip over all the leading empty paths
3683 while (*src == separator) {
3684 src ++;
3685 }
3686
3687 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3688 strncpy(copy, src, strlen(src) + 1);
3689
3690 // trim all trailing empty paths
3691 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3692 *tail = '\0';
3693 }
3694
3695 char from[3] = {separator, separator, '\0'};
3696 char to [2] = {separator, '\0'};
3697 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3698 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3699 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3700 }
3701
3702 _java_class_path->set_value(copy);
3703 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3704 }
3705
3706 if (!PrintSharedArchiveAndExit) {
3707 ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value());
3708 }
3709 }
3710
3711 static bool has_jar_files(const char* directory) {
3712 DIR* dir = os::opendir(directory);
3713 if (dir == NULL) return false;
3714
3715 struct dirent *entry;
3716 bool hasJarFile = false;
3717 while (!hasJarFile && (entry = os::readdir(dir)) != NULL) {
3718 const char* name = entry->d_name;
3719 const char* ext = name + strlen(name) - 4;
3720 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3721 }
3722 os::closedir(dir);
3723 return hasJarFile ;
3724 }
3725
3726 // returns the number of directories in the given path containing JAR files
3727 // If the skip argument is not NULL, it will skip that directory
3728 static int check_non_empty_dirs(const char* path, const char* type, const char* skip) {
3729 const char separator = *os::path_separator();
3730 const char* const end = path + strlen(path);
3731 int nonEmptyDirs = 0;
3732 while (path < end) {
3733 const char* tmp_end = strchr(path, separator);
3734 if (tmp_end == NULL) {
3735 if ((skip == NULL || strcmp(path, skip) != 0) && has_jar_files(path)) {
3736 nonEmptyDirs++;
3737 jio_fprintf(defaultStream::output_stream(),
3738 "Non-empty %s directory: %s\n", type, path);
3739 }
3740 path = end;
3741 } else {
3742 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3743 memcpy(dirpath, path, tmp_end - path);
3744 dirpath[tmp_end - path] = '\0';
3745 if ((skip == NULL || strcmp(dirpath, skip) != 0) && has_jar_files(dirpath)) {
3746 nonEmptyDirs++;
3747 jio_fprintf(defaultStream::output_stream(),
3748 "Non-empty %s directory: %s\n", type, dirpath);
3749 }
3750 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
3751 path = tmp_end + 1;
3752 }
3753 }
3754 return nonEmptyDirs;
3755 }
3756
3757 // Returns true if endorsed standards override mechanism and extension mechanism
3758 // are not used.
3759 static bool check_endorsed_and_ext_dirs() {
3760 if (!CheckEndorsedAndExtDirs)
3761 return true;
3762
3763 char endorsedDir[JVM_MAXPATHLEN];
3764 char extDir[JVM_MAXPATHLEN];
3765 const char* fileSep = os::file_separator();
3766 jio_snprintf(endorsedDir, sizeof(endorsedDir), "%s%slib%sendorsed",
3767 Arguments::get_java_home(), fileSep, fileSep);
3768 jio_snprintf(extDir, sizeof(extDir), "%s%slib%sext",
3769 Arguments::get_java_home(), fileSep, fileSep);
3770
3771 // check endorsed directory
3772 int nonEmptyDirs = check_non_empty_dirs(Arguments::get_endorsed_dir(), "endorsed", NULL);
3773
3774 // check the extension directories but skip the default lib/ext directory
3775 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs(), "extension", extDir);
3776
3777 // List of JAR files installed in the default lib/ext directory.
3778 // -XX:+CheckEndorsedAndExtDirs checks if any non-JDK file installed
3779 static const char* jdk_ext_jars[] = {
3780 "access-bridge-32.jar",
3781 "access-bridge-64.jar",
3782 "access-bridge.jar",
3783 "cldrdata.jar",
3784 "dnsns.jar",
3785 "jaccess.jar",
3786 "jfxrt.jar",
3787 "localedata.jar",
3788 "nashorn.jar",
3789 "sunec.jar",
3790 "sunjce_provider.jar",
3791 "sunmscapi.jar",
3792 "sunpkcs11.jar",
3793 "ucrypto.jar",
3794 "zipfs.jar",
3795 NULL
3796 };
3797
3798 // check if the default lib/ext directory has any non-JDK jar files; if so, error
3799 DIR* dir = os::opendir(extDir);
3800 if (dir != NULL) {
3801 int num_ext_jars = 0;
3802 struct dirent *entry;
3803 while ((entry = os::readdir(dir)) != NULL) {
3804 const char* name = entry->d_name;
3805 const char* ext = name + strlen(name) - 4;
3806 if (ext > name && (os::file_name_strcmp(ext, ".jar") == 0)) {
3807 bool is_jdk_jar = false;
3808 const char* jarfile = NULL;
3809 for (int i=0; (jarfile = jdk_ext_jars[i]) != NULL; i++) {
3810 if (os::file_name_strcmp(name, jarfile) == 0) {
3811 is_jdk_jar = true;
3812 break;
3813 }
3814 }
3815 if (!is_jdk_jar) {
3816 jio_fprintf(defaultStream::output_stream(),
3817 "%s installed in <JAVA_HOME>/lib/ext\n", name);
3818 num_ext_jars++;
3819 }
3820 }
3821 }
3822 os::closedir(dir);
3823 if (num_ext_jars > 0) {
3824 nonEmptyDirs += 1;
3825 }
3826 }
3827
3828 // check if the default lib/endorsed directory exists; if so, error
3829 dir = os::opendir(endorsedDir);
3830 if (dir != NULL) {
3831 jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed exists\n");
3832 os::closedir(dir);
3833 nonEmptyDirs += 1;
3834 }
3835
3836 if (nonEmptyDirs > 0) {
3837 jio_fprintf(defaultStream::output_stream(),
3838 "Endorsed standards override mechanism and extension mechanism "
3839 "will not be supported in a future release.\n"
3840 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n");
3841 return false;
3842 }
3843
3844 return true;
3845 }
3846
3847 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3848 // This must be done after all -D arguments have been processed.
3849 scp_p->expand_endorsed();
3850
3851 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3852 // Assemble the bootclasspath elements into the final path.
3853 Arguments::set_sysclasspath(scp_p->combined_path());
3854 }
3855
3856 if (!check_endorsed_and_ext_dirs()) {
3857 return JNI_ERR;
3858 }
3859
3860 // This must be done after all arguments have been processed
3861 // and the container support has been initialized since AggressiveHeap
3862 // relies on the amount of total memory available.
3863 if (AggressiveHeap) {
3864 jint result = set_aggressive_heap_flags();
3865 if (result != JNI_OK) {
3866 return result;
3867 }
3868 }
3869 // This must be done after all arguments have been processed.
3870 // java_compiler() true means set to "NONE" or empty.
3871 if (java_compiler() && !xdebug_mode()) {
3872 // For backwards compatibility, we switch to interpreted mode if
3873 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3874 // not specified.
3875 set_mode_flags(_int);
3876 }
3877 if (CompileThreshold == 0) {
3878 set_mode_flags(_int);
3879 }
3880
3881 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3882 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3883 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3884 }
3885
3886 #ifndef COMPILER2
3887 // Don't degrade server performance for footprint
3888 if (FLAG_IS_DEFAULT(UseLargePages) &&
3889 MaxHeapSize < LargePageHeapSizeThreshold) {
3890 // No need for large granularity pages w/small heaps.
3891 // Note that large pages are enabled/disabled for both the
3892 // Java heap and the code cache.
3893 FLAG_SET_DEFAULT(UseLargePages, false);
3894 }
3895
3896 #else
3897 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3898 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3899 }
3900 #endif
3901
3902 #ifndef TIERED
3903 // Tiered compilation is undefined.
3904 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3905 #endif
3906
3907 // If we are running in a headless jre, force java.awt.headless property
3908 // to be true unless the property has already been set.
3909 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3910 if (os::is_headless_jre()) {
3911 const char* headless = Arguments::get_property("java.awt.headless");
3912 if (headless == NULL) {
3913 char envbuffer[128];
3914 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3915 if (!add_property("java.awt.headless=true")) {
3916 return JNI_ENOMEM;
3917 }
3918 } else {
3919 char buffer[256];
3920 jio_snprintf(buffer, 256, "java.awt.headless=%s", envbuffer);
3921 if (!add_property(buffer)) {
3922 return JNI_ENOMEM;
3923 }
3924 }
3925 }
3926 }
3927
3928 if (!check_vm_args_consistency()) {
3929 return JNI_ERR;
3930 }
3931
3932 return JNI_OK;
3933 }
3934
3935 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3936 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3937 scp_assembly_required_p);
3938 }
3939
3940 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3941 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3942 scp_assembly_required_p);
3943 }
3944
3945 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3946 const int N_MAX_OPTIONS = 64;
3947 const int OPTION_BUFFER_SIZE = 1024;
3948 char buffer[OPTION_BUFFER_SIZE];
3949
3950 // The variable will be ignored if it exceeds the length of the buffer.
3951 // Don't check this variable if user has special privileges
3952 // (e.g. unix su command).
3953 if (os::getenv(name, buffer, sizeof(buffer)) &&
3954 !os::have_special_privileges()) {
3955 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3956 jio_fprintf(defaultStream::error_stream(),
3957 "Picked up %s: %s\n", name, buffer);
3958 char* rd = buffer; // pointer to the input string (rd)
3959 int i;
3960 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3961 while (isspace(*rd)) rd++; // skip whitespace
3962 if (*rd == 0) break; // we re done when the input string is read completely
3963
3964 // The output, option string, overwrites the input string.
3965 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3966 // input string (rd).
3967 char* wrt = rd;
3968
3969 options[i++].optionString = wrt; // Fill in option
3970 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3971 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3972 int quote = *rd; // matching quote to look for
3973 rd++; // don't copy open quote
3974 while (*rd != quote) { // include everything (even spaces) up until quote
3975 if (*rd == 0) { // string termination means unmatched string
3976 jio_fprintf(defaultStream::error_stream(),
3977 "Unmatched quote in %s\n", name);
3978 return JNI_ERR;
3979 }
3980 *wrt++ = *rd++; // copy to option string
3981 }
3982 rd++; // don't copy close quote
3983 } else {
3984 *wrt++ = *rd++; // copy to option string
3985 }
3986 }
3987 // Need to check if we're done before writing a NULL,
3988 // because the write could be to the byte that rd is pointing to.
3989 if (*rd++ == 0) {
3990 *wrt = 0;
3991 break;
3992 }
3993 *wrt = 0; // Zero terminate option
3994 }
3995 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3996 JavaVMInitArgs vm_args;
3997 vm_args.version = JNI_VERSION_1_2;
3998 vm_args.options = options;
3999 vm_args.nOptions = i;
4000 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
4001
4002 if (PrintVMOptions) {
4003 const char* tail;
4004 for (int i = 0; i < vm_args.nOptions; i++) {
4005 const JavaVMOption *option = vm_args.options + i;
4006 if (match_option(option, "-XX:", &tail)) {
4007 logOption(tail);
4008 }
4009 }
4010 }
4011
4012 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
4013 }
4014 return JNI_OK;
4015 }
4016
4017 void Arguments::set_shared_spaces_flags() {
4018 if (DumpSharedSpaces) {
4019 if (FailOverToOldVerifier) {
4020 // Don't fall back to the old verifier on verification failure. If a
4021 // class fails verification with the split verifier, it might fail the
4022 // CDS runtime verifier constraint check. In that case, we don't want
4023 // to share the class. We only archive classes that pass the split verifier.
4024 FLAG_SET_DEFAULT(FailOverToOldVerifier, false);
4025 }
4026
4027 if (RequireSharedSpaces) {
4028 warning("cannot dump shared archive while using shared archive");
4029 }
4030 UseSharedSpaces = false;
4031 #ifdef _LP64
4032 if (!UseCompressedOops || !UseCompressedClassPointers) {
4033 vm_exit_during_initialization(
4034 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
4035 }
4036 } else {
4037 if (!UseCompressedOops || !UseCompressedClassPointers) {
4038 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
4039 }
4040 #endif
4041 }
4042 }
4043
4044 #if !INCLUDE_ALL_GCS
4045 static void force_serial_gc() {
4046 FLAG_SET_DEFAULT(UseSerialGC, true);
4047 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
4048 UNSUPPORTED_GC_OPTION(UseG1GC);
4049 UNSUPPORTED_GC_OPTION(UseParallelGC);
4050 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
4051 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
4052 UNSUPPORTED_GC_OPTION(UseParNewGC);
4053 }
4054 #endif // INCLUDE_ALL_GCS
4055
4056 // Sharing support
4057 // Construct the path to the archive
4058 static char* get_shared_archive_path() {
4059 char *shared_archive_path;
4060 if (SharedArchiveFile == NULL) {
4061 char jvm_path[JVM_MAXPATHLEN];
4062 os::jvm_path(jvm_path, sizeof(jvm_path));
4063 char *end = strrchr(jvm_path, *os::file_separator());
4064 if (end != NULL) *end = '\0';
4065 size_t jvm_path_len = strlen(jvm_path);
4066 size_t file_sep_len = strlen(os::file_separator());
4067 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
4068 file_sep_len + 20, mtInternal);
4069 if (shared_archive_path != NULL) {
4070 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
4071 strncat(shared_archive_path, os::file_separator(), file_sep_len);
4072 strncat(shared_archive_path, "classes.jsa", 11);
4073 }
4074 } else {
4075 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
4076 if (shared_archive_path != NULL) {
4077 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
4078 }
4079 }
4080 return shared_archive_path;
4081 }
4082
4083 #ifndef PRODUCT
4084 // Determine whether LogVMOutput should be implicitly turned on.
4085 static bool use_vm_log() {
4086 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
4087 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
4088 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
4089 PrintAssembly || TraceDeoptimization || TraceDependencies ||
4090 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
4091 return true;
4092 }
4093
4094 #ifdef COMPILER1
4095 if (PrintC1Statistics) {
4096 return true;
4097 }
4098 #endif // COMPILER1
4099
4100 #ifdef COMPILER2
4101 if (PrintOptoAssembly || PrintOptoStatistics) {
4102 return true;
4103 }
4104 #endif // COMPILER2
4105
4106 return false;
4107 }
4108 #endif // PRODUCT
4109
4110 // Parse entry point called from JNI_CreateJavaVM
4111
4112 jint Arguments::parse(const JavaVMInitArgs* args) {
4113
4114 // Remaining part of option string
4115 const char* tail;
4116
4117 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
4118 const char* hotspotrc = ".hotspotrc";
4119 bool settings_file_specified = false;
4120 bool needs_hotspotrc_warning = false;
4121
4122 ArgumentsExt::process_options(args);
4123
4124 const char* flags_file;
4125 int index;
4126 for (index = 0; index < args->nOptions; index++) {
4127 const JavaVMOption *option = args->options + index;
4128 if (match_option(option, "-XX:Flags=", &tail)) {
4129 flags_file = tail;
4130 settings_file_specified = true;
4131 }
4132 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
4133 PrintVMOptions = true;
4134 }
4135 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
4136 PrintVMOptions = false;
4137 }
4138 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
4139 IgnoreUnrecognizedVMOptions = true;
4140 }
4141 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
4142 IgnoreUnrecognizedVMOptions = false;
4143 }
4144 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
4145 CommandLineFlags::printFlags(tty, false);
4146 vm_exit(0);
4147 }
4148 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
4149 #if INCLUDE_NMT
4150 // The launcher did not setup nmt environment variable properly.
4151 if (!MemTracker::check_launcher_nmt_support(tail)) {
4152 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
4153 }
4154
4155 // Verify if nmt option is valid.
4156 if (MemTracker::verify_nmt_option()) {
4157 // Late initialization, still in single-threaded mode.
4158 if (MemTracker::tracking_level() >= NMT_summary) {
4159 MemTracker::init();
4160 }
4161 } else {
4162 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
4163 }
4164 #else
4165 jio_fprintf(defaultStream::error_stream(),
4166 "Native Memory Tracking is not supported in this VM\n");
4167 return JNI_ERR;
4168 #endif
4169 }
4170
4171
4172 #ifndef PRODUCT
4173 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
4174 CommandLineFlags::printFlags(tty, true);
4175 vm_exit(0);
4176 }
4177 #endif
4178 }
4179
4180 if (IgnoreUnrecognizedVMOptions) {
4181 // uncast const to modify the flag args->ignoreUnrecognized
4182 *(jboolean*)(&args->ignoreUnrecognized) = true;
4183 }
4184
4185 // Parse specified settings file
4186 if (settings_file_specified) {
4187 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
4188 return JNI_EINVAL;
4189 }
4190 } else {
4191 #ifdef ASSERT
4192 // Parse default .hotspotrc settings file
4193 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
4194 return JNI_EINVAL;
4195 }
4196 #else
4197 struct stat buf;
4198 if (os::stat(hotspotrc, &buf) == 0) {
4199 needs_hotspotrc_warning = true;
4200 }
4201 #endif
4202 }
4203
4204 if (PrintVMOptions) {
4205 for (index = 0; index < args->nOptions; index++) {
4206 const JavaVMOption *option = args->options + index;
4207 if (match_option(option, "-XX:", &tail)) {
4208 logOption(tail);
4209 }
4210 }
4211 }
4212
4213 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
4214 jint result = parse_vm_init_args(args);
4215 if (result != JNI_OK) {
4216 return result;
4217 }
4218
4219 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
4220 SharedArchivePath = get_shared_archive_path();
4221 if (SharedArchivePath == NULL) {
4222 return JNI_ENOMEM;
4223 }
4224
4225 // Set up VerifySharedSpaces
4226 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
4227 VerifySharedSpaces = true;
4228 }
4229
4230 // Delay warning until here so that we've had a chance to process
4231 // the -XX:-PrintWarnings flag
4232 if (needs_hotspotrc_warning) {
4233 warning("%s file is present but has been ignored. "
4234 "Run with -XX:Flags=%s to load the file.",
4235 hotspotrc, hotspotrc);
4236 }
4237
4238 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
4239 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
4240 #endif
4241
4242 #if INCLUDE_ALL_GCS
4243 #if (defined JAVASE_EMBEDDED || defined ARM)
4244 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
4245 #endif
4246 #endif
4247
4248 #ifndef PRODUCT
4249 if (TraceBytecodesAt != 0) {
4250 TraceBytecodes = true;
4251 }
4252 if (CountCompiledCalls) {
4253 if (UseCounterDecay) {
4254 warning("UseCounterDecay disabled because CountCalls is set");
4255 UseCounterDecay = false;
4256 }
4257 }
4258 #endif // PRODUCT
4259
4260 // JSR 292 is not supported before 1.7
4261 if (!JDK_Version::is_gte_jdk17x_version()) {
4262 if (EnableInvokeDynamic) {
4263 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
4264 warning("JSR 292 is not supported before 1.7. Disabling support.");
4265 }
4266 EnableInvokeDynamic = false;
4267 }
4268 }
4269
4270 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
4271 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4272 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
4273 }
4274 ScavengeRootsInCode = 1;
4275 }
4276
4277 if (PrintGCDetails) {
4278 // Turn on -verbose:gc options as well
4279 PrintGC = true;
4280 }
4281
4282 if (!JDK_Version::is_gte_jdk18x_version()) {
4283 // To avoid changing the log format for 7 updates this flag is only
4284 // true by default in JDK8 and above.
4285 if (FLAG_IS_DEFAULT(PrintGCCause)) {
4286 FLAG_SET_DEFAULT(PrintGCCause, false);
4287 }
4288 }
4289
4290 // Set object alignment values.
4291 set_object_alignment();
4292
4293 #if !INCLUDE_ALL_GCS
4294 force_serial_gc();
4295 #endif // INCLUDE_ALL_GCS
4296 #if !INCLUDE_CDS
4297 if (DumpSharedSpaces || RequireSharedSpaces) {
4298 jio_fprintf(defaultStream::error_stream(),
4299 "Shared spaces are not supported in this VM\n");
4300 return JNI_ERR;
4301 }
4302 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4303 warning("Shared spaces are not supported in this VM");
4304 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4305 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4306 }
4307 no_shared_spaces("CDS Disabled");
4308 #endif // INCLUDE_CDS
4309
4310 return JNI_OK;
4311 }
4312
4313 jint Arguments::apply_ergo() {
4314
4315 // Set flags based on ergonomics.
4316 set_ergonomics_flags();
4317
4318 set_shared_spaces_flags();
4319
4320 #if defined(SPARC)
4321 // BIS instructions require 'membar' instruction regardless of the number
4322 // of CPUs because in virtualized/container environments which might use only 1
4323 // CPU, BIS instructions may produce incorrect results.
4324
4325 if (FLAG_IS_DEFAULT(AssumeMP)) {
4326 FLAG_SET_DEFAULT(AssumeMP, true);
4327 }
4328 #endif
4329
4330 // Check the GC selections again.
4331 if (!check_gc_consistency()) {
4332 return JNI_EINVAL;
4333 }
4334
4335 if (TieredCompilation) {
4336 set_tiered_flags();
4337 } else {
4338 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
4339 if (CompilationPolicyChoice >= 2) {
4340 vm_exit_during_initialization(
4341 "Incompatible compilation policy selected", NULL);
4342 }
4343 }
4344 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
4345 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4346 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
4347 }
4348
4349
4350 // Set heap size based on available physical memory
4351 set_heap_size();
4352
4353 ArgumentsExt::set_gc_specific_flags();
4354
4355 // Initialize Metaspace flags and alignments.
4356 Metaspace::ergo_initialize();
4357
4358 // Set bytecode rewriting flags
4359 set_bytecode_flags();
4360
4361 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
4362 set_aggressive_opts_flags();
4363
4364 // Turn off biased locking for locking debug mode flags,
4365 // which are subtlely different from each other but neither works with
4366 // biased locking.
4367 if (UseHeavyMonitors
4368 #ifdef COMPILER1
4369 || !UseFastLocking
4370 #endif // COMPILER1
4371 ) {
4372 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4373 // flag set to true on command line; warn the user that they
4374 // can't enable biased locking here
4375 warning("Biased Locking is not supported with locking debug flags"
4376 "; ignoring UseBiasedLocking flag." );
4377 }
4378 UseBiasedLocking = false;
4379 }
4380
4381 #ifdef ZERO
4382 // Clear flags not supported on zero.
4383 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4384 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4385 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4386 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4387 #endif // CC_INTERP
4388
4389 #ifdef COMPILER2
4390 if (!EliminateLocks) {
4391 EliminateNestedLocks = false;
4392 }
4393 if (!Inline) {
4394 IncrementalInline = false;
4395 }
4396 #ifndef PRODUCT
4397 if (!IncrementalInline) {
4398 AlwaysIncrementalInline = false;
4399 }
4400 #endif
4401 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
4402 // incremental inlining: bump MaxNodeLimit
4403 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
4404 }
4405 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4406 // nothing to use the profiling, turn if off
4407 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4408 }
4409 #endif
4410
4411 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4412 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4413 DebugNonSafepoints = true;
4414 }
4415
4416 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4417 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4418 }
4419
4420 if (UseOnStackReplacement && !UseLoopCounter) {
4421 warning("On-stack-replacement requires loop counters; enabling loop counters");
4422 FLAG_SET_DEFAULT(UseLoopCounter, true);
4423 }
4424
4425 #ifndef PRODUCT
4426 if (CompileTheWorld) {
4427 // Force NmethodSweeper to sweep whole CodeCache each time.
4428 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
4429 NmethodSweepFraction = 1;
4430 }
4431 }
4432
4433 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4434 if (use_vm_log()) {
4435 LogVMOutput = true;
4436 }
4437 }
4438 #endif // PRODUCT
4439
4440 if (PrintCommandLineFlags) {
4441 CommandLineFlags::printSetFlags(tty);
4442 }
4443
4444 // Apply CPU specific policy for the BiasedLocking
4445 if (UseBiasedLocking) {
4446 if (!VM_Version::use_biased_locking() &&
4447 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4448 UseBiasedLocking = false;
4449 }
4450 }
4451 #ifdef COMPILER2
4452 if (!UseBiasedLocking || EmitSync != 0) {
4453 UseOptoBiasInlining = false;
4454 }
4455 #endif
4456
4457 // set PauseAtExit if the gamma launcher was used and a debugger is attached
4458 // but only if not already set on the commandline
4459 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
4460 bool set = false;
4461 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
4462 if (!set) {
4463 FLAG_SET_DEFAULT(PauseAtExit, true);
4464 }
4465 }
4466
4467 return JNI_OK;
4468 }
4469
4470 jint Arguments::adjust_after_os() {
4471 if (UseNUMA) {
4472 if (UseParallelGC || UseParallelOldGC) {
4473 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4474 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4475 }
4476 }
4477 // UseNUMAInterleaving is set to ON for all collectors and
4478 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4479 // such as the parallel collector for Linux and Solaris will
4480 // interleave old gen and survivor spaces on top of NUMA
4481 // allocation policy for the eden space.
4482 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4483 // all platforms and ParallelGC on Windows will interleave all
4484 // of the heap spaces across NUMA nodes.
4485 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4486 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4487 }
4488 }
4489 return JNI_OK;
4490 }
4491
4492 int Arguments::PropertyList_count(SystemProperty* pl) {
4493 int count = 0;
4494 while(pl != NULL) {
4495 count++;
4496 pl = pl->next();
4497 }
4498 return count;
4499 }
4500
4501 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4502 assert(key != NULL, "just checking");
4503 SystemProperty* prop;
4504 for (prop = pl; prop != NULL; prop = prop->next()) {
4505 if (strcmp(key, prop->key()) == 0) return prop->value();
4506 }
4507 return NULL;
4508 }
4509
4510 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4511 int count = 0;
4512 const char* ret_val = NULL;
4513
4514 while(pl != NULL) {
4515 if(count >= index) {
4516 ret_val = pl->key();
4517 break;
4518 }
4519 count++;
4520 pl = pl->next();
4521 }
4522
4523 return ret_val;
4524 }
4525
4526 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4527 int count = 0;
4528 char* ret_val = NULL;
4529
4530 while(pl != NULL) {
4531 if(count >= index) {
4532 ret_val = pl->value();
4533 break;
4534 }
4535 count++;
4536 pl = pl->next();
4537 }
4538
4539 return ret_val;
4540 }
4541
4542 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4543 SystemProperty* p = *plist;
4544 if (p == NULL) {
4545 *plist = new_p;
4546 } else {
4547 while (p->next() != NULL) {
4548 p = p->next();
4549 }
4550 p->set_next(new_p);
4551 }
4552 }
4553
4554 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4555 if (plist == NULL)
4556 return;
4557
4558 SystemProperty* new_p = new SystemProperty(k, v, true);
4559 PropertyList_add(plist, new_p);
4560 }
4561
4562 // This add maintains unique property key in the list.
4563 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4564 if (plist == NULL)
4565 return;
4566
4567 // If property key exist then update with new value.
4568 SystemProperty* prop;
4569 for (prop = *plist; prop != NULL; prop = prop->next()) {
4570 if (strcmp(k, prop->key()) == 0) {
4571 if (append) {
4572 prop->append_value(v);
4573 } else {
4574 prop->set_value(v);
4575 }
4576 return;
4577 }
4578 }
4579
4580 PropertyList_add(plist, k, v);
4581 }
4582
4583 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4584 // Returns true if all of the source pointed by src has been copied over to
4585 // the destination buffer pointed by buf. Otherwise, returns false.
4586 // Notes:
4587 // 1. If the length (buflen) of the destination buffer excluding the
4588 // NULL terminator character is not long enough for holding the expanded
4589 // pid characters, it also returns false instead of returning the partially
4590 // expanded one.
4591 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4592 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4593 char* buf, size_t buflen) {
4594 const char* p = src;
4595 char* b = buf;
4596 const char* src_end = &src[srclen];
4597 char* buf_end = &buf[buflen - 1];
4598
4599 while (p < src_end && b < buf_end) {
4600 if (*p == '%') {
4601 switch (*(++p)) {
4602 case '%': // "%%" ==> "%"
4603 *b++ = *p++;
4604 break;
4605 case 'p': { // "%p" ==> current process id
4606 // buf_end points to the character before the last character so
4607 // that we could write '\0' to the end of the buffer.
4608 size_t buf_sz = buf_end - b + 1;
4609 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4610
4611 // if jio_snprintf fails or the buffer is not long enough to hold
4612 // the expanded pid, returns false.
4613 if (ret < 0 || ret >= (int)buf_sz) {
4614 return false;
4615 } else {
4616 b += ret;
4617 assert(*b == '\0', "fail in copy_expand_pid");
4618 if (p == src_end && b == buf_end + 1) {
4619 // reach the end of the buffer.
4620 return true;
4621 }
4622 }
4623 p++;
4624 break;
4625 }
4626 default :
4627 *b++ = '%';
4628 }
4629 } else {
4630 *b++ = *p++;
4631 }
4632 }
4633 *b = '\0';
4634 return (p == src_end); // return false if not all of the source was copied
4635 }