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