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, or GCLogFileSize is 0
1910 void check_gclog_consistency() {
1911 if (UseGCLogFileRotation) {
1912 if ((Arguments::gc_log_filename() == NULL) ||
1913 (NumberOfGCLogFiles == 0) ||
1914 (GCLogFileSize == 0)) {
1915 jio_fprintf(defaultStream::output_stream(),
1916 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>[k|K|m|M|g|G]\n"
1917 "where num_of_file > 0 and num_of_size > 0\n"
1918 "GC log rotation is turned off\n");
1919 UseGCLogFileRotation = false;
1920 }
1921 }
1922
1923 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1924 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1925 jio_fprintf(defaultStream::output_stream(),
1926 "GCLogFileSize changed to minimum 8K\n");
1927 }
1928 }
1929
1930 // This function is called for -Xloggc:<filename>, it can be used
1931 // to check if a given file name(or string) conforms to the following
1932 // specification:
1933 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1934 // %p and %t only allowed once. We only limit usage of filename not path
1935 bool is_filename_valid(const char *file_name) {
1936 const char* p = file_name;
1937 char file_sep = os::file_separator()[0];
1938 const char* cp;
1939 // skip prefix path
1940 for (cp = file_name; *cp != '\0'; cp++) {
1941 if (*cp == '/' || *cp == file_sep) {
1942 p = cp + 1;
1943 }
1944 }
1945
1946 int count_p = 0;
1947 int count_t = 0;
1948 while (*p != '\0') {
1949 if ((*p >= '0' && *p <= '9') ||
1950 (*p >= 'A' && *p <= 'Z') ||
1951 (*p >= 'a' && *p <= 'z') ||
1952 *p == '-' ||
1953 *p == '_' ||
1954 *p == '.') {
1955 p++;
1956 continue;
1957 }
1958 if (*p == '%') {
1959 if(*(p + 1) == 'p') {
1960 p += 2;
1961 count_p ++;
1962 continue;
1963 }
1964 if (*(p + 1) == 't') {
1965 p += 2;
1966 count_t ++;
1967 continue;
1968 }
1969 }
1970 return false;
1971 }
1972 return count_p < 2 && count_t < 2;
1973 }
1974
1975 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
1976 if (!is_percentage(min_heap_free_ratio)) {
1977 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
1978 return false;
1979 }
1980 if (min_heap_free_ratio > MaxHeapFreeRatio) {
1981 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1982 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
1983 MaxHeapFreeRatio);
1984 return false;
1985 }
1986 return true;
1987 }
1988
1989 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
1990 if (!is_percentage(max_heap_free_ratio)) {
1991 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
1992 return false;
1993 }
1994 if (max_heap_free_ratio < MinHeapFreeRatio) {
1995 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
1996 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
1997 MinHeapFreeRatio);
1998 return false;
1999 }
2000 return true;
2001 }
2002
2003 // Check consistency of GC selection
2004 bool Arguments::check_gc_consistency() {
2005 check_gclog_consistency();
2006 bool status = true;
2007 // Ensure that the user has not selected conflicting sets
2008 // of collectors. [Note: this check is merely a user convenience;
2009 // collectors over-ride each other so that only a non-conflicting
2010 // set is selected; however what the user gets is not what they
2011 // may have expected from the combination they asked for. It's
2012 // better to reduce user confusion by not allowing them to
2013 // select conflicting combinations.
2014 uint i = 0;
2015 if (UseSerialGC) i++;
2016 if (UseConcMarkSweepGC || UseParNewGC) i++;
2017 if (UseParallelGC || UseParallelOldGC) i++;
2018 if (UseG1GC) i++;
2019 if (i > 1) {
2020 jio_fprintf(defaultStream::error_stream(),
2021 "Conflicting collector combinations in option list; "
2022 "please refer to the release notes for the combinations "
2023 "allowed\n");
2024 status = false;
2025 }
2026 return status;
2027 }
2028
2029 void Arguments::check_deprecated_gcs() {
2030 if (UseConcMarkSweepGC && !UseParNewGC) {
2031 warning("Using the DefNew young collector with the CMS collector is deprecated "
2032 "and will likely be removed in a future release");
2033 }
2034
2035 if (UseParNewGC && !UseConcMarkSweepGC) {
2036 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2037 // set up UseSerialGC properly, so that can't be used in the check here.
2038 warning("Using the ParNew young collector with the Serial old collector is deprecated "
2039 "and will likely be removed in a future release");
2040 }
2041
2042 if (CMSIncrementalMode) {
2043 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
2044 }
2045 }
2046
2047 void Arguments::check_deprecated_gc_flags() {
2048 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2049 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2050 "and will likely be removed in future release");
2051 }
2052 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2053 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2054 "Use MaxRAMFraction instead.");
2055 }
2056 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) {
2057 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release.");
2058 }
2059 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) {
2060 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release.");
2061 }
2062 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) {
2063 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release.");
2064 }
2065 }
2066
2067 // Check stack pages settings
2068 bool Arguments::check_stack_pages()
2069 {
2070 bool status = true;
2071 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2072 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2073 // greater stack shadow pages can't generate instruction to bang stack
2074 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2075 return status;
2076 }
2077
2078 // Check the consistency of vm_init_args
2079 bool Arguments::check_vm_args_consistency() {
2080 // Method for adding checks for flag consistency.
2081 // The intent is to warn the user of all possible conflicts,
2082 // before returning an error.
2083 // Note: Needs platform-dependent factoring.
2084 bool status = true;
2085
2086 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
2087 // builds so the cost of stack banging can be measured.
2088 #if (defined(PRODUCT) && defined(SOLARIS))
2089 if (!UseBoundThreads && !UseStackBanging) {
2090 jio_fprintf(defaultStream::error_stream(),
2091 "-UseStackBanging conflicts with -UseBoundThreads\n");
2092
2093 status = false;
2094 }
2095 #endif
2096
2097 if (TLABRefillWasteFraction == 0) {
2098 jio_fprintf(defaultStream::error_stream(),
2099 "TLABRefillWasteFraction should be a denominator, "
2100 "not " SIZE_FORMAT "\n",
2101 TLABRefillWasteFraction);
2102 status = false;
2103 }
2104
2105 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2106 "AdaptiveSizePolicyWeight");
2107 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2108
2109 // Divide by bucket size to prevent a large size from causing rollover when
2110 // calculating amount of memory needed to be allocated for the String table.
2111 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2112 (max_uintx / StringTable::bucket_size()), "StringTable size");
2113
2114 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2115 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2116
2117 {
2118 // Using "else if" below to avoid printing two error messages if min > max.
2119 // This will also prevent us from reporting both min>100 and max>100 at the
2120 // same time, but that is less annoying than printing two identical errors IMHO.
2121 FormatBuffer<80> err_msg("");
2122 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2123 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2124 status = false;
2125 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2126 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2127 status = false;
2128 }
2129 }
2130
2131 // Min/MaxMetaspaceFreeRatio
2132 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2133 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2134
2135 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2136 jio_fprintf(defaultStream::error_stream(),
2137 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2138 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2139 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2140 MinMetaspaceFreeRatio,
2141 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2142 MaxMetaspaceFreeRatio);
2143 status = false;
2144 }
2145
2146 // Trying to keep 100% free is not practical
2147 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2148
2149 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2150 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2151 }
2152
2153 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2154 // Settings to encourage splitting.
2155 if (!FLAG_IS_CMDLINE(NewRatio)) {
2156 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2157 }
2158 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2159 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2160 }
2161 }
2162
2163 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2164 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2165 if (GCTimeLimit == 100) {
2166 // Turn off gc-overhead-limit-exceeded checks
2167 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2168 }
2169
2170 status = status && check_gc_consistency();
2171 status = status && check_stack_pages();
2172
2173 if (CMSIncrementalMode) {
2174 if (!UseConcMarkSweepGC) {
2175 jio_fprintf(defaultStream::error_stream(),
2176 "error: invalid argument combination.\n"
2177 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2178 "selected in order\nto use CMSIncrementalMode.\n");
2179 status = false;
2180 } else {
2181 status = status && verify_percentage(CMSIncrementalDutyCycle,
2182 "CMSIncrementalDutyCycle");
2183 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2184 "CMSIncrementalDutyCycleMin");
2185 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2186 "CMSIncrementalSafetyFactor");
2187 status = status && verify_percentage(CMSIncrementalOffset,
2188 "CMSIncrementalOffset");
2189 status = status && verify_percentage(CMSExpAvgFactor,
2190 "CMSExpAvgFactor");
2191 // If it was not set on the command line, set
2192 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2193 if (CMSInitiatingOccupancyFraction < 0) {
2194 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2195 }
2196 }
2197 }
2198
2199 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2200 // insists that we hold the requisite locks so that the iteration is
2201 // MT-safe. For the verification at start-up and shut-down, we don't
2202 // yet have a good way of acquiring and releasing these locks,
2203 // which are not visible at the CollectedHeap level. We want to
2204 // be able to acquire these locks and then do the iteration rather
2205 // than just disable the lock verification. This will be fixed under
2206 // bug 4788986.
2207 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2208 if (VerifyDuringStartup) {
2209 warning("Heap verification at start-up disabled "
2210 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2211 VerifyDuringStartup = false; // Disable verification at start-up
2212 }
2213
2214 if (VerifyBeforeExit) {
2215 warning("Heap verification at shutdown disabled "
2216 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2217 VerifyBeforeExit = false; // Disable verification at shutdown
2218 }
2219 }
2220
2221 // Note: only executed in non-PRODUCT mode
2222 if (!UseAsyncConcMarkSweepGC &&
2223 (ExplicitGCInvokesConcurrent ||
2224 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2225 jio_fprintf(defaultStream::error_stream(),
2226 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2227 " with -UseAsyncConcMarkSweepGC");
2228 status = false;
2229 }
2230
2231 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2232
2233 #if INCLUDE_ALL_GCS
2234 if (UseG1GC) {
2235 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2236 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2237 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2238
2239 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2240 "InitiatingHeapOccupancyPercent");
2241 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2242 "G1RefProcDrainInterval");
2243 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2244 "G1ConcMarkStepDurationMillis");
2245 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2246 "G1ConcRSHotCardLimit");
2247 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2248 "G1ConcRSLogCacheSize");
2249 }
2250 if (UseConcMarkSweepGC) {
2251 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2252 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2253 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2254 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2255
2256 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2257
2258 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2259 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2260 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2261
2262 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2263
2264 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2265 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2266
2267 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2268 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2269 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2270
2271 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2272
2273 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2274
2275 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2276 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2277 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2278 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2279 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2280 }
2281
2282 if (UseParallelGC || UseParallelOldGC) {
2283 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2284 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2285
2286 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2287 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2288
2289 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2290 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2291
2292 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2293
2294 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2295 }
2296 #endif // INCLUDE_ALL_GCS
2297
2298 status = status && verify_interval(RefDiscoveryPolicy,
2299 ReferenceProcessor::DiscoveryPolicyMin,
2300 ReferenceProcessor::DiscoveryPolicyMax,
2301 "RefDiscoveryPolicy");
2302
2303 // Limit the lower bound of this flag to 1 as it is used in a division
2304 // expression.
2305 status = status && verify_interval(TLABWasteTargetPercent,
2306 1, 100, "TLABWasteTargetPercent");
2307
2308 status = status && verify_object_alignment();
2309
2310 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2311 "CompressedClassSpaceSize");
2312
2313 status = status && verify_interval(MarkStackSizeMax,
2314 1, (max_jint - 1), "MarkStackSizeMax");
2315 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2316
2317 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2318
2319 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2320
2321 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2322
2323 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2324 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2325
2326 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2327
2328 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2329 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2330 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2331 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2332
2333 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2334 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2335
2336 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2337 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2338 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2339
2340 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2341 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2342
2343 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2344 // just for that, so hardcode here.
2345 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2346 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2347 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2348 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2349
2350 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2351
2352 if (PrintNMTStatistics) {
2353 #if INCLUDE_NMT
2354 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2355 #endif // INCLUDE_NMT
2356 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2357 PrintNMTStatistics = false;
2358 #if INCLUDE_NMT
2359 }
2360 #endif
2361 }
2362
2363 // Need to limit the extent of the padding to reasonable size.
2364 // 8K is well beyond the reasonable HW cache line size, even with the
2365 // aggressive prefetching, while still leaving the room for segregating
2366 // among the distinct pages.
2367 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2368 jio_fprintf(defaultStream::error_stream(),
2369 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2370 ContendedPaddingWidth, 0, 8192);
2371 status = false;
2372 }
2373
2374 // Need to enforce the padding not to break the existing field alignments.
2375 // It is sufficient to check against the largest type size.
2376 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2377 jio_fprintf(defaultStream::error_stream(),
2378 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2379 ContendedPaddingWidth, BytesPerLong);
2380 status = false;
2381 }
2382
2383 // Check lower bounds of the code cache
2384 // Template Interpreter code is approximately 3X larger in debug builds.
2385 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2386 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2387 jio_fprintf(defaultStream::error_stream(),
2388 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2389 os::vm_page_size()/K);
2390 status = false;
2391 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2392 jio_fprintf(defaultStream::error_stream(),
2393 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2394 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2395 status = false;
2396 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2397 jio_fprintf(defaultStream::error_stream(),
2398 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2399 min_code_cache_size/K);
2400 status = false;
2401 } else if (ReservedCodeCacheSize > 2*G) {
2402 // Code cache size larger than MAXINT is not supported.
2403 jio_fprintf(defaultStream::error_stream(),
2404 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2405 (2*G)/M);
2406 status = false;
2407 }
2408
2409 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction");
2410 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2411 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2412 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2413
2414 // TieredCompilation needs at least 2 compiler threads.
2415 const int num_min_compiler_threads = (TieredCompilation && (TieredStopAtLevel >= CompLevel_full_optimization)) ? 2 : 1;
2416 status &=verify_min_value(CICompilerCount, num_min_compiler_threads, "CICompilerCount");
2417
2418 return status;
2419 }
2420
2421 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2422 const char* option_type) {
2423 if (ignore) return false;
2424
2425 const char* spacer = " ";
2426 if (option_type == NULL) {
2427 option_type = ++spacer; // Set both to the empty string.
2428 }
2429
2430 if (os::obsolete_option(option)) {
2431 jio_fprintf(defaultStream::error_stream(),
2432 "Obsolete %s%soption: %s\n", option_type, spacer,
2433 option->optionString);
2434 return false;
2435 } else {
2436 jio_fprintf(defaultStream::error_stream(),
2437 "Unrecognized %s%soption: %s\n", option_type, spacer,
2438 option->optionString);
2439 return true;
2440 }
2441 }
2442
2443 static const char* user_assertion_options[] = {
2444 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2445 };
2446
2447 static const char* system_assertion_options[] = {
2448 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2449 };
2450
2451 // Return true if any of the strings in null-terminated array 'names' matches.
2452 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2453 // the option must match exactly.
2454 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2455 bool tail_allowed) {
2456 for (/* empty */; *names != NULL; ++names) {
2457 if (match_option(option, *names, tail)) {
2458 if (**tail == '\0' || tail_allowed && **tail == ':') {
2459 return true;
2460 }
2461 }
2462 }
2463 return false;
2464 }
2465
2466 bool Arguments::parse_uintx(const char* value,
2467 uintx* uintx_arg,
2468 uintx min_size) {
2469
2470 // Check the sign first since atomull() parses only unsigned values.
2471 bool value_is_positive = !(*value == '-');
2472
2473 if (value_is_positive) {
2474 julong n;
2475 bool good_return = atomull(value, &n);
2476 if (good_return) {
2477 bool above_minimum = n >= min_size;
2478 bool value_is_too_large = n > max_uintx;
2479
2480 if (above_minimum && !value_is_too_large) {
2481 *uintx_arg = n;
2482 return true;
2483 }
2484 }
2485 }
2486 return false;
2487 }
2488
2489 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2490 julong* long_arg,
2491 julong min_size) {
2492 if (!atomull(s, long_arg)) return arg_unreadable;
2493 return check_memory_size(*long_arg, min_size);
2494 }
2495
2496 // Parse JavaVMInitArgs structure
2497
2498 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2499 // For components of the system classpath.
2500 SysClassPath scp(Arguments::get_sysclasspath());
2501 bool scp_assembly_required = false;
2502
2503 // Save default settings for some mode flags
2504 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2505 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2506 Arguments::_ClipInlining = ClipInlining;
2507 Arguments::_BackgroundCompilation = BackgroundCompilation;
2508
2509 // Setup flags for mixed which is the default
2510 set_mode_flags(_mixed);
2511
2512 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2513 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2514 if (result != JNI_OK) {
2515 return result;
2516 }
2517
2518 // Parse JavaVMInitArgs structure passed in
2519 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2520 if (result != JNI_OK) {
2521 return result;
2522 }
2523
2524 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2525 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2526 if (result != JNI_OK) {
2527 return result;
2528 }
2529
2530 // Do final processing now that all arguments have been parsed
2531 result = finalize_vm_init_args(&scp, scp_assembly_required);
2532 if (result != JNI_OK) {
2533 return result;
2534 }
2535
2536 return JNI_OK;
2537 }
2538
2539 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2540 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2541 // are dealing with -agentpath (case where name is a path), otherwise with
2542 // -agentlib
2543 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2544 char *_name;
2545 const char *_hprof = "hprof", *_jdwp = "jdwp";
2546 size_t _len_hprof, _len_jdwp, _len_prefix;
2547
2548 if (is_path) {
2549 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2550 return false;
2551 }
2552
2553 _name++; // skip past last path separator
2554 _len_prefix = strlen(JNI_LIB_PREFIX);
2555
2556 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2557 return false;
2558 }
2559
2560 _name += _len_prefix;
2561 _len_hprof = strlen(_hprof);
2562 _len_jdwp = strlen(_jdwp);
2563
2564 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2565 _name += _len_hprof;
2566 }
2567 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2568 _name += _len_jdwp;
2569 }
2570 else {
2571 return false;
2572 }
2573
2574 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2575 return false;
2576 }
2577
2578 return true;
2579 }
2580
2581 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2582 return true;
2583 }
2584
2585 return false;
2586 }
2587
2588 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2589 SysClassPath* scp_p,
2590 bool* scp_assembly_required_p,
2591 Flag::Flags origin) {
2592 // Remaining part of option string
2593 const char* tail;
2594
2595 // iterate over arguments
2596 for (int index = 0; index < args->nOptions; index++) {
2597 bool is_absolute_path = false; // for -agentpath vs -agentlib
2598
2599 const JavaVMOption* option = args->options + index;
2600
2601 if (!match_option(option, "-Djava.class.path", &tail) &&
2602 !match_option(option, "-Dsun.java.command", &tail) &&
2603 !match_option(option, "-Dsun.java.launcher", &tail)) {
2604
2605 // add all jvm options to the jvm_args string. This string
2606 // is used later to set the java.vm.args PerfData string constant.
2607 // the -Djava.class.path and the -Dsun.java.command options are
2608 // omitted from jvm_args string as each have their own PerfData
2609 // string constant object.
2610 build_jvm_args(option->optionString);
2611 }
2612
2613 // -verbose:[class/gc/jni]
2614 if (match_option(option, "-verbose", &tail)) {
2615 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2616 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2617 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2618 } else if (!strcmp(tail, ":gc")) {
2619 FLAG_SET_CMDLINE(bool, PrintGC, true);
2620 } else if (!strcmp(tail, ":jni")) {
2621 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2622 }
2623 // -da / -ea / -disableassertions / -enableassertions
2624 // These accept an optional class/package name separated by a colon, e.g.,
2625 // -da:java.lang.Thread.
2626 } else if (match_option(option, user_assertion_options, &tail, true)) {
2627 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2628 if (*tail == '\0') {
2629 JavaAssertions::setUserClassDefault(enable);
2630 } else {
2631 assert(*tail == ':', "bogus match by match_option()");
2632 JavaAssertions::addOption(tail + 1, enable);
2633 }
2634 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2635 } else if (match_option(option, system_assertion_options, &tail, false)) {
2636 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2637 JavaAssertions::setSystemClassDefault(enable);
2638 // -bootclasspath:
2639 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2640 scp_p->reset_path(tail);
2641 *scp_assembly_required_p = true;
2642 // -bootclasspath/a:
2643 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2644 scp_p->add_suffix(tail);
2645 *scp_assembly_required_p = true;
2646 // -bootclasspath/p:
2647 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2648 scp_p->add_prefix(tail);
2649 *scp_assembly_required_p = true;
2650 // -Xrun
2651 } else if (match_option(option, "-Xrun", &tail)) {
2652 if (tail != NULL) {
2653 const char* pos = strchr(tail, ':');
2654 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2655 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2656 name[len] = '\0';
2657
2658 char *options = NULL;
2659 if(pos != NULL) {
2660 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2661 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2662 }
2663 #if !INCLUDE_JVMTI
2664 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2665 jio_fprintf(defaultStream::error_stream(),
2666 "Profiling and debugging agents are not supported in this VM\n");
2667 return JNI_ERR;
2668 }
2669 #endif // !INCLUDE_JVMTI
2670 add_init_library(name, options);
2671 }
2672 // -agentlib and -agentpath
2673 } else if (match_option(option, "-agentlib:", &tail) ||
2674 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2675 if(tail != NULL) {
2676 const char* pos = strchr(tail, '=');
2677 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2678 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2679 name[len] = '\0';
2680
2681 char *options = NULL;
2682 if(pos != NULL) {
2683 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2684 }
2685 #if !INCLUDE_JVMTI
2686 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2687 jio_fprintf(defaultStream::error_stream(),
2688 "Profiling and debugging agents are not supported in this VM\n");
2689 return JNI_ERR;
2690 }
2691 #endif // !INCLUDE_JVMTI
2692 add_init_agent(name, options, is_absolute_path);
2693 }
2694 // -javaagent
2695 } else if (match_option(option, "-javaagent:", &tail)) {
2696 #if !INCLUDE_JVMTI
2697 jio_fprintf(defaultStream::error_stream(),
2698 "Instrumentation agents are not supported in this VM\n");
2699 return JNI_ERR;
2700 #else
2701 if(tail != NULL) {
2702 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2703 add_init_agent("instrument", options, false);
2704 }
2705 #endif // !INCLUDE_JVMTI
2706 // -Xnoclassgc
2707 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2708 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2709 // -Xincgc: i-CMS
2710 } else if (match_option(option, "-Xincgc", &tail)) {
2711 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2712 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2713 // -Xnoincgc: no i-CMS
2714 } else if (match_option(option, "-Xnoincgc", &tail)) {
2715 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2716 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2717 // -Xconcgc
2718 } else if (match_option(option, "-Xconcgc", &tail)) {
2719 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2720 // -Xnoconcgc
2721 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2722 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2723 // -Xbatch
2724 } else if (match_option(option, "-Xbatch", &tail)) {
2725 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2726 // -Xmn for compatibility with other JVM vendors
2727 } else if (match_option(option, "-Xmn", &tail)) {
2728 julong long_initial_young_size = 0;
2729 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2730 if (errcode != arg_in_range) {
2731 jio_fprintf(defaultStream::error_stream(),
2732 "Invalid initial young generation size: %s\n", option->optionString);
2733 describe_range_error(errcode);
2734 return JNI_EINVAL;
2735 }
2736 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2737 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2738 // -Xms
2739 } else if (match_option(option, "-Xms", &tail)) {
2740 julong long_initial_heap_size = 0;
2741 // an initial heap size of 0 means automatically determine
2742 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2743 if (errcode != arg_in_range) {
2744 jio_fprintf(defaultStream::error_stream(),
2745 "Invalid initial heap size: %s\n", option->optionString);
2746 describe_range_error(errcode);
2747 return JNI_EINVAL;
2748 }
2749 set_min_heap_size((uintx)long_initial_heap_size);
2750 // Currently the minimum size and the initial heap sizes are the same.
2751 // Can be overridden with -XX:InitialHeapSize.
2752 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2753 // -Xmx
2754 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2755 julong long_max_heap_size = 0;
2756 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2757 if (errcode != arg_in_range) {
2758 jio_fprintf(defaultStream::error_stream(),
2759 "Invalid maximum heap size: %s\n", option->optionString);
2760 describe_range_error(errcode);
2761 return JNI_EINVAL;
2762 }
2763 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2764 // Xmaxf
2765 } else if (match_option(option, "-Xmaxf", &tail)) {
2766 char* err;
2767 int maxf = (int)(strtod(tail, &err) * 100);
2768 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2769 jio_fprintf(defaultStream::error_stream(),
2770 "Bad max heap free percentage size: %s\n",
2771 option->optionString);
2772 return JNI_EINVAL;
2773 } else {
2774 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2775 }
2776 // Xminf
2777 } else if (match_option(option, "-Xminf", &tail)) {
2778 char* err;
2779 int minf = (int)(strtod(tail, &err) * 100);
2780 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2781 jio_fprintf(defaultStream::error_stream(),
2782 "Bad min heap free percentage size: %s\n",
2783 option->optionString);
2784 return JNI_EINVAL;
2785 } else {
2786 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2787 }
2788 // -Xss
2789 } else if (match_option(option, "-Xss", &tail)) {
2790 julong long_ThreadStackSize = 0;
2791 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2792 if (errcode != arg_in_range) {
2793 jio_fprintf(defaultStream::error_stream(),
2794 "Invalid thread stack size: %s\n", option->optionString);
2795 describe_range_error(errcode);
2796 return JNI_EINVAL;
2797 }
2798 // Internally track ThreadStackSize in units of 1024 bytes.
2799 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2800 round_to((int)long_ThreadStackSize, K) / K);
2801 // -Xoss
2802 } else if (match_option(option, "-Xoss", &tail)) {
2803 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2804 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2805 julong long_CodeCacheExpansionSize = 0;
2806 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2807 if (errcode != arg_in_range) {
2808 jio_fprintf(defaultStream::error_stream(),
2809 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2810 os::vm_page_size()/K);
2811 return JNI_EINVAL;
2812 }
2813 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2814 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2815 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2816 julong long_ReservedCodeCacheSize = 0;
2817
2818 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2819 if (errcode != arg_in_range) {
2820 jio_fprintf(defaultStream::error_stream(),
2821 "Invalid maximum code cache size: %s.\n", option->optionString);
2822 return JNI_EINVAL;
2823 }
2824 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2825 //-XX:IncreaseFirstTierCompileThresholdAt=
2826 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2827 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2828 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2829 jio_fprintf(defaultStream::error_stream(),
2830 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2831 option->optionString);
2832 return JNI_EINVAL;
2833 }
2834 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2835 // -green
2836 } else if (match_option(option, "-green", &tail)) {
2837 jio_fprintf(defaultStream::error_stream(),
2838 "Green threads support not available\n");
2839 return JNI_EINVAL;
2840 // -native
2841 } else if (match_option(option, "-native", &tail)) {
2842 // HotSpot always uses native threads, ignore silently for compatibility
2843 // -Xsqnopause
2844 } else if (match_option(option, "-Xsqnopause", &tail)) {
2845 // EVM option, ignore silently for compatibility
2846 // -Xrs
2847 } else if (match_option(option, "-Xrs", &tail)) {
2848 // Classic/EVM option, new functionality
2849 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2850 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2851 // change default internal VM signals used - lower case for back compat
2852 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2853 // -Xoptimize
2854 } else if (match_option(option, "-Xoptimize", &tail)) {
2855 // EVM option, ignore silently for compatibility
2856 // -Xprof
2857 } else if (match_option(option, "-Xprof", &tail)) {
2858 #if INCLUDE_FPROF
2859 _has_profile = true;
2860 #else // INCLUDE_FPROF
2861 jio_fprintf(defaultStream::error_stream(),
2862 "Flat profiling is not supported in this VM.\n");
2863 return JNI_ERR;
2864 #endif // INCLUDE_FPROF
2865 // -Xconcurrentio
2866 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2867 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2868 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2869 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2870 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2871 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2872
2873 // -Xinternalversion
2874 } else if (match_option(option, "-Xinternalversion", &tail)) {
2875 jio_fprintf(defaultStream::output_stream(), "%s\n",
2876 VM_Version::internal_vm_info_string());
2877 vm_exit(0);
2878 #ifndef PRODUCT
2879 // -Xprintflags
2880 } else if (match_option(option, "-Xprintflags", &tail)) {
2881 CommandLineFlags::printFlags(tty, false);
2882 vm_exit(0);
2883 #endif
2884 // -D
2885 } else if (match_option(option, "-D", &tail)) {
2886 if (!add_property(tail)) {
2887 return JNI_ENOMEM;
2888 }
2889 // Out of the box management support
2890 if (match_option(option, "-Dcom.sun.management", &tail)) {
2891 #if INCLUDE_MANAGEMENT
2892 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2893 #else
2894 jio_fprintf(defaultStream::output_stream(),
2895 "-Dcom.sun.management is not supported in this VM.\n");
2896 return JNI_ERR;
2897 #endif
2898 }
2899 // -Xint
2900 } else if (match_option(option, "-Xint", &tail)) {
2901 set_mode_flags(_int);
2902 // -Xmixed
2903 } else if (match_option(option, "-Xmixed", &tail)) {
2904 set_mode_flags(_mixed);
2905 // -Xcomp
2906 } else if (match_option(option, "-Xcomp", &tail)) {
2907 // for testing the compiler; turn off all flags that inhibit compilation
2908 set_mode_flags(_comp);
2909 // -Xshare:dump
2910 } else if (match_option(option, "-Xshare:dump", &tail)) {
2911 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2912 set_mode_flags(_int); // Prevent compilation, which creates objects
2913 // -Xshare:on
2914 } else if (match_option(option, "-Xshare:on", &tail)) {
2915 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2916 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2917 // -Xshare:auto
2918 } else if (match_option(option, "-Xshare:auto", &tail)) {
2919 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2920 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2921 // -Xshare:off
2922 } else if (match_option(option, "-Xshare:off", &tail)) {
2923 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2924 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2925 // -Xverify
2926 } else if (match_option(option, "-Xverify", &tail)) {
2927 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2928 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2929 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2930 } else if (strcmp(tail, ":remote") == 0) {
2931 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2932 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2933 } else if (strcmp(tail, ":none") == 0) {
2934 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2935 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2936 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2937 return JNI_EINVAL;
2938 }
2939 // -Xdebug
2940 } else if (match_option(option, "-Xdebug", &tail)) {
2941 // note this flag has been used, then ignore
2942 set_xdebug_mode(true);
2943 // -Xnoagent
2944 } else if (match_option(option, "-Xnoagent", &tail)) {
2945 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2946 } else if (match_option(option, "-Xboundthreads", &tail)) {
2947 // Bind user level threads to kernel threads (Solaris only)
2948 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2949 } else if (match_option(option, "-Xloggc:", &tail)) {
2950 // Redirect GC output to the file. -Xloggc:<filename>
2951 // ostream_init_log(), when called will use this filename
2952 // to initialize a fileStream.
2953 _gc_log_filename = strdup(tail);
2954 if (!is_filename_valid(_gc_log_filename)) {
2955 jio_fprintf(defaultStream::output_stream(),
2956 "Invalid file name for use with -Xloggc: Filename can only contain the "
2957 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2958 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2959 return JNI_EINVAL;
2960 }
2961 FLAG_SET_CMDLINE(bool, PrintGC, true);
2962 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2963
2964 // JNI hooks
2965 } else if (match_option(option, "-Xcheck", &tail)) {
2966 if (!strcmp(tail, ":jni")) {
2967 #if !INCLUDE_JNI_CHECK
2968 warning("JNI CHECKING is not supported in this VM");
2969 #else
2970 CheckJNICalls = true;
2971 #endif // INCLUDE_JNI_CHECK
2972 } else if (is_bad_option(option, args->ignoreUnrecognized,
2973 "check")) {
2974 return JNI_EINVAL;
2975 }
2976 } else if (match_option(option, "vfprintf", &tail)) {
2977 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2978 } else if (match_option(option, "exit", &tail)) {
2979 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2980 } else if (match_option(option, "abort", &tail)) {
2981 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2982 // -XX:+AggressiveHeap
2983 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2984
2985 // This option inspects the machine and attempts to set various
2986 // parameters to be optimal for long-running, memory allocation
2987 // intensive jobs. It is intended for machines with large
2988 // amounts of cpu and memory.
2989
2990 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2991 // VM, but we may not be able to represent the total physical memory
2992 // available (like having 8gb of memory on a box but using a 32bit VM).
2993 // Thus, we need to make sure we're using a julong for intermediate
2994 // calculations.
2995 julong initHeapSize;
2996 julong total_memory = os::physical_memory();
2997
2998 if (total_memory < (julong)256*M) {
2999 jio_fprintf(defaultStream::error_stream(),
3000 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3001 vm_exit(1);
3002 }
3003
3004 // The heap size is half of available memory, or (at most)
3005 // all of possible memory less 160mb (leaving room for the OS
3006 // when using ISM). This is the maximum; because adaptive sizing
3007 // is turned on below, the actual space used may be smaller.
3008
3009 initHeapSize = MIN2(total_memory / (julong)2,
3010 total_memory - (julong)160*M);
3011
3012 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3013
3014 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3015 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3016 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3017 // Currently the minimum size and the initial heap sizes are the same.
3018 set_min_heap_size(initHeapSize);
3019 }
3020 if (FLAG_IS_DEFAULT(NewSize)) {
3021 // Make the young generation 3/8ths of the total heap.
3022 FLAG_SET_CMDLINE(uintx, NewSize,
3023 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3024 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3025 }
3026
3027 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3028 FLAG_SET_DEFAULT(UseLargePages, true);
3029 #endif
3030
3031 // Increase some data structure sizes for efficiency
3032 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3033 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3034 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3035
3036 // See the OldPLABSize comment below, but replace 'after promotion'
3037 // with 'after copying'. YoungPLABSize is the size of the survivor
3038 // space per-gc-thread buffers. The default is 4kw.
3039 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3040
3041 // OldPLABSize is the size of the buffers in the old gen that
3042 // UseParallelGC uses to promote live data that doesn't fit in the
3043 // survivor spaces. At any given time, there's one for each gc thread.
3044 // The default size is 1kw. These buffers are rarely used, since the
3045 // survivor spaces are usually big enough. For specjbb, however, there
3046 // are occasions when there's lots of live data in the young gen
3047 // and we end up promoting some of it. We don't have a definite
3048 // explanation for why bumping OldPLABSize helps, but the theory
3049 // is that a bigger PLAB results in retaining something like the
3050 // original allocation order after promotion, which improves mutator
3051 // locality. A minor effect may be that larger PLABs reduce the
3052 // number of PLAB allocation events during gc. The value of 8kw
3053 // was arrived at by experimenting with specjbb.
3054 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3055
3056 // Enable parallel GC and adaptive generation sizing
3057 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3058 FLAG_SET_DEFAULT(ParallelGCThreads,
3059 Abstract_VM_Version::parallel_worker_threads());
3060
3061 // Encourage steady state memory management
3062 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3063
3064 // This appears to improve mutator locality
3065 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3066
3067 // Get around early Solaris scheduling bug
3068 // (affinity vs other jobs on system)
3069 // but disallow DR and offlining (5008695).
3070 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3071
3072 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
3073 // The last option must always win.
3074 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3075 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3076 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
3077 // The last option must always win.
3078 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3079 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3080 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
3081 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
3082 jio_fprintf(defaultStream::error_stream(),
3083 "Please use CMSClassUnloadingEnabled in place of "
3084 "CMSPermGenSweepingEnabled in the future\n");
3085 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
3086 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
3087 jio_fprintf(defaultStream::error_stream(),
3088 "Please use -XX:+UseGCOverheadLimit in place of "
3089 "-XX:+UseGCTimeLimit in the future\n");
3090 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
3091 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
3092 jio_fprintf(defaultStream::error_stream(),
3093 "Please use -XX:-UseGCOverheadLimit in place of "
3094 "-XX:-UseGCTimeLimit in the future\n");
3095 // The TLE options are for compatibility with 1.3 and will be
3096 // removed without notice in a future release. These options
3097 // are not to be documented.
3098 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
3099 // No longer used.
3100 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
3101 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
3102 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
3103 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3104 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
3105 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
3106 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
3107 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
3108 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
3109 // No longer used.
3110 } else if (match_option(option, "-XX:TLESize=", &tail)) {
3111 julong long_tlab_size = 0;
3112 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
3113 if (errcode != arg_in_range) {
3114 jio_fprintf(defaultStream::error_stream(),
3115 "Invalid TLAB size: %s\n", option->optionString);
3116 describe_range_error(errcode);
3117 return JNI_EINVAL;
3118 }
3119 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
3120 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
3121 // No longer used.
3122 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
3123 FLAG_SET_CMDLINE(bool, UseTLAB, true);
3124 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
3125 FLAG_SET_CMDLINE(bool, UseTLAB, false);
3126 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
3127 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3128 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3129 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
3130 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3131 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3132 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
3133 #if defined(DTRACE_ENABLED)
3134 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3135 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3136 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3137 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3138 #else // defined(DTRACE_ENABLED)
3139 jio_fprintf(defaultStream::error_stream(),
3140 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3141 return JNI_EINVAL;
3142 #endif // defined(DTRACE_ENABLED)
3143 #ifdef ASSERT
3144 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3145 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3146 // disable scavenge before parallel mark-compact
3147 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3148 #endif
3149 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3150 julong cms_blocks_to_claim = (julong)atol(tail);
3151 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3152 jio_fprintf(defaultStream::error_stream(),
3153 "Please use -XX:OldPLABSize in place of "
3154 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3155 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3156 julong cms_blocks_to_claim = (julong)atol(tail);
3157 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3158 jio_fprintf(defaultStream::error_stream(),
3159 "Please use -XX:OldPLABSize in place of "
3160 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3161 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3162 julong old_plab_size = 0;
3163 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3164 if (errcode != arg_in_range) {
3165 jio_fprintf(defaultStream::error_stream(),
3166 "Invalid old PLAB size: %s\n", option->optionString);
3167 describe_range_error(errcode);
3168 return JNI_EINVAL;
3169 }
3170 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3171 jio_fprintf(defaultStream::error_stream(),
3172 "Please use -XX:OldPLABSize in place of "
3173 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3174 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3175 julong young_plab_size = 0;
3176 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3177 if (errcode != arg_in_range) {
3178 jio_fprintf(defaultStream::error_stream(),
3179 "Invalid young PLAB size: %s\n", option->optionString);
3180 describe_range_error(errcode);
3181 return JNI_EINVAL;
3182 }
3183 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3184 jio_fprintf(defaultStream::error_stream(),
3185 "Please use -XX:YoungPLABSize in place of "
3186 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3187 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3188 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3189 julong stack_size = 0;
3190 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3191 if (errcode != arg_in_range) {
3192 jio_fprintf(defaultStream::error_stream(),
3193 "Invalid mark stack size: %s\n", option->optionString);
3194 describe_range_error(errcode);
3195 return JNI_EINVAL;
3196 }
3197 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3198 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3199 julong max_stack_size = 0;
3200 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3201 if (errcode != arg_in_range) {
3202 jio_fprintf(defaultStream::error_stream(),
3203 "Invalid maximum mark stack size: %s\n",
3204 option->optionString);
3205 describe_range_error(errcode);
3206 return JNI_EINVAL;
3207 }
3208 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3209 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3210 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3211 uintx conc_threads = 0;
3212 if (!parse_uintx(tail, &conc_threads, 1)) {
3213 jio_fprintf(defaultStream::error_stream(),
3214 "Invalid concurrent threads: %s\n", option->optionString);
3215 return JNI_EINVAL;
3216 }
3217 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3218 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3219 julong max_direct_memory_size = 0;
3220 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3221 if (errcode != arg_in_range) {
3222 jio_fprintf(defaultStream::error_stream(),
3223 "Invalid maximum direct memory size: %s\n",
3224 option->optionString);
3225 describe_range_error(errcode);
3226 return JNI_EINVAL;
3227 }
3228 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3229 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3230 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3231 // away and will cause VM initialization failures!
3232 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3233 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3234 #if !INCLUDE_MANAGEMENT
3235 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3236 jio_fprintf(defaultStream::error_stream(),
3237 "ManagementServer is not supported in this VM.\n");
3238 return JNI_ERR;
3239 #endif // INCLUDE_MANAGEMENT
3240 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3241 // Skip -XX:Flags= since that case has already been handled
3242 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3243 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3244 return JNI_EINVAL;
3245 }
3246 }
3247 // Unknown option
3248 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3249 return JNI_ERR;
3250 }
3251 }
3252
3253 // Change the default value for flags which have different default values
3254 // when working with older JDKs.
3255 #ifdef LINUX
3256 if (JDK_Version::current().compare_major(6) <= 0 &&
3257 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3258 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3259 }
3260 #endif // LINUX
3261 return JNI_OK;
3262 }
3263
3264 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3265 // This must be done after all -D arguments have been processed.
3266 scp_p->expand_endorsed();
3267
3268 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3269 // Assemble the bootclasspath elements into the final path.
3270 Arguments::set_sysclasspath(scp_p->combined_path());
3271 }
3272
3273 // This must be done after all arguments have been processed.
3274 // java_compiler() true means set to "NONE" or empty.
3275 if (java_compiler() && !xdebug_mode()) {
3276 // For backwards compatibility, we switch to interpreted mode if
3277 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3278 // not specified.
3279 set_mode_flags(_int);
3280 }
3281 if (CompileThreshold == 0) {
3282 set_mode_flags(_int);
3283 }
3284
3285 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3286 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3287 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3288 }
3289
3290 #ifndef COMPILER2
3291 // Don't degrade server performance for footprint
3292 if (FLAG_IS_DEFAULT(UseLargePages) &&
3293 MaxHeapSize < LargePageHeapSizeThreshold) {
3294 // No need for large granularity pages w/small heaps.
3295 // Note that large pages are enabled/disabled for both the
3296 // Java heap and the code cache.
3297 FLAG_SET_DEFAULT(UseLargePages, false);
3298 }
3299
3300 #else
3301 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3302 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3303 }
3304 #endif
3305
3306 #ifndef TIERED
3307 // Tiered compilation is undefined.
3308 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3309 #endif
3310
3311 // If we are running in a headless jre, force java.awt.headless property
3312 // to be true unless the property has already been set.
3313 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3314 if (os::is_headless_jre()) {
3315 const char* headless = Arguments::get_property("java.awt.headless");
3316 if (headless == NULL) {
3317 char envbuffer[128];
3318 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3319 if (!add_property("java.awt.headless=true")) {
3320 return JNI_ENOMEM;
3321 }
3322 } else {
3323 char buffer[256];
3324 strcpy(buffer, "java.awt.headless=");
3325 strcat(buffer, envbuffer);
3326 if (!add_property(buffer)) {
3327 return JNI_ENOMEM;
3328 }
3329 }
3330 }
3331 }
3332
3333 if (!check_vm_args_consistency()) {
3334 return JNI_ERR;
3335 }
3336
3337 return JNI_OK;
3338 }
3339
3340 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3341 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3342 scp_assembly_required_p);
3343 }
3344
3345 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3346 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3347 scp_assembly_required_p);
3348 }
3349
3350 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3351 const int N_MAX_OPTIONS = 64;
3352 const int OPTION_BUFFER_SIZE = 1024;
3353 char buffer[OPTION_BUFFER_SIZE];
3354
3355 // The variable will be ignored if it exceeds the length of the buffer.
3356 // Don't check this variable if user has special privileges
3357 // (e.g. unix su command).
3358 if (os::getenv(name, buffer, sizeof(buffer)) &&
3359 !os::have_special_privileges()) {
3360 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3361 jio_fprintf(defaultStream::error_stream(),
3362 "Picked up %s: %s\n", name, buffer);
3363 char* rd = buffer; // pointer to the input string (rd)
3364 int i;
3365 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3366 while (isspace(*rd)) rd++; // skip whitespace
3367 if (*rd == 0) break; // we re done when the input string is read completely
3368
3369 // The output, option string, overwrites the input string.
3370 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3371 // input string (rd).
3372 char* wrt = rd;
3373
3374 options[i++].optionString = wrt; // Fill in option
3375 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3376 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3377 int quote = *rd; // matching quote to look for
3378 rd++; // don't copy open quote
3379 while (*rd != quote) { // include everything (even spaces) up until quote
3380 if (*rd == 0) { // string termination means unmatched string
3381 jio_fprintf(defaultStream::error_stream(),
3382 "Unmatched quote in %s\n", name);
3383 return JNI_ERR;
3384 }
3385 *wrt++ = *rd++; // copy to option string
3386 }
3387 rd++; // don't copy close quote
3388 } else {
3389 *wrt++ = *rd++; // copy to option string
3390 }
3391 }
3392 // Need to check if we're done before writing a NULL,
3393 // because the write could be to the byte that rd is pointing to.
3394 if (*rd++ == 0) {
3395 *wrt = 0;
3396 break;
3397 }
3398 *wrt = 0; // Zero terminate option
3399 }
3400 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3401 JavaVMInitArgs vm_args;
3402 vm_args.version = JNI_VERSION_1_2;
3403 vm_args.options = options;
3404 vm_args.nOptions = i;
3405 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3406
3407 if (PrintVMOptions) {
3408 const char* tail;
3409 for (int i = 0; i < vm_args.nOptions; i++) {
3410 const JavaVMOption *option = vm_args.options + i;
3411 if (match_option(option, "-XX:", &tail)) {
3412 logOption(tail);
3413 }
3414 }
3415 }
3416
3417 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3418 }
3419 return JNI_OK;
3420 }
3421
3422 void Arguments::set_shared_spaces_flags() {
3423 if (DumpSharedSpaces) {
3424 if (RequireSharedSpaces) {
3425 warning("cannot dump shared archive while using shared archive");
3426 }
3427 UseSharedSpaces = false;
3428 #ifdef _LP64
3429 if (!UseCompressedOops || !UseCompressedClassPointers) {
3430 vm_exit_during_initialization(
3431 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3432 }
3433 } else {
3434 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.
3435 if (!UseCompressedOops || !UseCompressedClassPointers) {
3436 no_shared_spaces();
3437 }
3438 #endif
3439 }
3440 }
3441
3442 #if !INCLUDE_ALL_GCS
3443 static void force_serial_gc() {
3444 FLAG_SET_DEFAULT(UseSerialGC, true);
3445 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3446 UNSUPPORTED_GC_OPTION(UseG1GC);
3447 UNSUPPORTED_GC_OPTION(UseParallelGC);
3448 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3449 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3450 UNSUPPORTED_GC_OPTION(UseParNewGC);
3451 }
3452 #endif // INCLUDE_ALL_GCS
3453
3454 // Sharing support
3455 // Construct the path to the archive
3456 static char* get_shared_archive_path() {
3457 char *shared_archive_path;
3458 if (SharedArchiveFile == NULL) {
3459 char jvm_path[JVM_MAXPATHLEN];
3460 os::jvm_path(jvm_path, sizeof(jvm_path));
3461 char *end = strrchr(jvm_path, *os::file_separator());
3462 if (end != NULL) *end = '\0';
3463 size_t jvm_path_len = strlen(jvm_path);
3464 size_t file_sep_len = strlen(os::file_separator());
3465 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3466 file_sep_len + 20, mtInternal);
3467 if (shared_archive_path != NULL) {
3468 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3469 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3470 strncat(shared_archive_path, "classes.jsa", 11);
3471 }
3472 } else {
3473 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3474 if (shared_archive_path != NULL) {
3475 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3476 }
3477 }
3478 return shared_archive_path;
3479 }
3480
3481 #ifndef PRODUCT
3482 // Determine whether LogVMOutput should be implicitly turned on.
3483 static bool use_vm_log() {
3484 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3485 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3486 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3487 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3488 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3489 return true;
3490 }
3491
3492 #ifdef COMPILER1
3493 if (PrintC1Statistics) {
3494 return true;
3495 }
3496 #endif // COMPILER1
3497
3498 #ifdef COMPILER2
3499 if (PrintOptoAssembly || PrintOptoStatistics) {
3500 return true;
3501 }
3502 #endif // COMPILER2
3503
3504 return false;
3505 }
3506 #endif // PRODUCT
3507
3508 // Parse entry point called from JNI_CreateJavaVM
3509
3510 jint Arguments::parse(const JavaVMInitArgs* args) {
3511
3512 // Remaining part of option string
3513 const char* tail;
3514
3515 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3516 const char* hotspotrc = ".hotspotrc";
3517 bool settings_file_specified = false;
3518 bool needs_hotspotrc_warning = false;
3519
3520 const char* flags_file;
3521 int index;
3522 for (index = 0; index < args->nOptions; index++) {
3523 const JavaVMOption *option = args->options + index;
3524 if (match_option(option, "-XX:Flags=", &tail)) {
3525 flags_file = tail;
3526 settings_file_specified = true;
3527 }
3528 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3529 PrintVMOptions = true;
3530 }
3531 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3532 PrintVMOptions = false;
3533 }
3534 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3535 IgnoreUnrecognizedVMOptions = true;
3536 }
3537 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3538 IgnoreUnrecognizedVMOptions = false;
3539 }
3540 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3541 CommandLineFlags::printFlags(tty, false);
3542 vm_exit(0);
3543 }
3544 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3545 #if INCLUDE_NMT
3546 MemTracker::init_tracking_options(tail);
3547 #else
3548 jio_fprintf(defaultStream::error_stream(),
3549 "Native Memory Tracking is not supported in this VM\n");
3550 return JNI_ERR;
3551 #endif
3552 }
3553
3554
3555 #ifndef PRODUCT
3556 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3557 CommandLineFlags::printFlags(tty, true);
3558 vm_exit(0);
3559 }
3560 #endif
3561 }
3562
3563 if (IgnoreUnrecognizedVMOptions) {
3564 // uncast const to modify the flag args->ignoreUnrecognized
3565 *(jboolean*)(&args->ignoreUnrecognized) = true;
3566 }
3567
3568 // Parse specified settings file
3569 if (settings_file_specified) {
3570 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3571 return JNI_EINVAL;
3572 }
3573 } else {
3574 #ifdef ASSERT
3575 // Parse default .hotspotrc settings file
3576 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3577 return JNI_EINVAL;
3578 }
3579 #else
3580 struct stat buf;
3581 if (os::stat(hotspotrc, &buf) == 0) {
3582 needs_hotspotrc_warning = true;
3583 }
3584 #endif
3585 }
3586
3587 if (PrintVMOptions) {
3588 for (index = 0; index < args->nOptions; index++) {
3589 const JavaVMOption *option = args->options + index;
3590 if (match_option(option, "-XX:", &tail)) {
3591 logOption(tail);
3592 }
3593 }
3594 }
3595
3596 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3597 jint result = parse_vm_init_args(args);
3598 if (result != JNI_OK) {
3599 return result;
3600 }
3601
3602 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3603 SharedArchivePath = get_shared_archive_path();
3604 if (SharedArchivePath == NULL) {
3605 return JNI_ENOMEM;
3606 }
3607
3608 // Delay warning until here so that we've had a chance to process
3609 // the -XX:-PrintWarnings flag
3610 if (needs_hotspotrc_warning) {
3611 warning("%s file is present but has been ignored. "
3612 "Run with -XX:Flags=%s to load the file.",
3613 hotspotrc, hotspotrc);
3614 }
3615
3616 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3617 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3618 #endif
3619
3620 #if INCLUDE_ALL_GCS
3621 #if (defined JAVASE_EMBEDDED || defined ARM)
3622 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3623 #endif
3624 #endif
3625
3626 #ifndef PRODUCT
3627 if (TraceBytecodesAt != 0) {
3628 TraceBytecodes = true;
3629 }
3630 if (CountCompiledCalls) {
3631 if (UseCounterDecay) {
3632 warning("UseCounterDecay disabled because CountCalls is set");
3633 UseCounterDecay = false;
3634 }
3635 }
3636 #endif // PRODUCT
3637
3638 // JSR 292 is not supported before 1.7
3639 if (!JDK_Version::is_gte_jdk17x_version()) {
3640 if (EnableInvokeDynamic) {
3641 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3642 warning("JSR 292 is not supported before 1.7. Disabling support.");
3643 }
3644 EnableInvokeDynamic = false;
3645 }
3646 }
3647
3648 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3649 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3650 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3651 }
3652 ScavengeRootsInCode = 1;
3653 }
3654
3655 if (PrintGCDetails) {
3656 // Turn on -verbose:gc options as well
3657 PrintGC = true;
3658 }
3659
3660 if (!JDK_Version::is_gte_jdk18x_version()) {
3661 // To avoid changing the log format for 7 updates this flag is only
3662 // true by default in JDK8 and above.
3663 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3664 FLAG_SET_DEFAULT(PrintGCCause, false);
3665 }
3666 }
3667
3668 // Set object alignment values.
3669 set_object_alignment();
3670
3671 #if !INCLUDE_ALL_GCS
3672 force_serial_gc();
3673 #endif // INCLUDE_ALL_GCS
3674 #if !INCLUDE_CDS
3675 if (DumpSharedSpaces || RequireSharedSpaces) {
3676 jio_fprintf(defaultStream::error_stream(),
3677 "Shared spaces are not supported in this VM\n");
3678 return JNI_ERR;
3679 }
3680 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3681 warning("Shared spaces are not supported in this VM");
3682 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3683 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3684 }
3685 no_shared_spaces();
3686 #endif // INCLUDE_CDS
3687
3688 return JNI_OK;
3689 }
3690
3691 jint Arguments::apply_ergo() {
3692
3693 // Set flags based on ergonomics.
3694 set_ergonomics_flags();
3695
3696 set_shared_spaces_flags();
3697
3698 // Check the GC selections again.
3699 if (!check_gc_consistency()) {
3700 return JNI_EINVAL;
3701 }
3702
3703 if (TieredCompilation) {
3704 set_tiered_flags();
3705 } else {
3706 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3707 if (CompilationPolicyChoice >= 2) {
3708 vm_exit_during_initialization(
3709 "Incompatible compilation policy selected", NULL);
3710 }
3711 }
3712 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered)
3713 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3714 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M));
3715 }
3716
3717
3718 // Set heap size based on available physical memory
3719 set_heap_size();
3720
3721 #if INCLUDE_ALL_GCS
3722 // Set per-collector flags
3723 if (UseParallelGC || UseParallelOldGC) {
3724 set_parallel_gc_flags();
3725 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below
3726 set_cms_and_parnew_gc_flags();
3727 } else if (UseParNewGC) { // Skipped if CMS is set above
3728 set_parnew_gc_flags();
3729 } else if (UseG1GC) {
3730 set_g1_gc_flags();
3731 }
3732 check_deprecated_gcs();
3733 check_deprecated_gc_flags();
3734 if (AssumeMP && !UseSerialGC) {
3735 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3736 warning("If the number of processors is expected to increase from one, then"
3737 " you should configure the number of parallel GC threads appropriately"
3738 " using -XX:ParallelGCThreads=N");
3739 }
3740 }
3741 if (MinHeapFreeRatio == 100) {
3742 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
3743 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
3744 }
3745 #else // INCLUDE_ALL_GCS
3746 assert(verify_serial_gc_flags(), "SerialGC unset");
3747 #endif // INCLUDE_ALL_GCS
3748
3749 // Initialize Metaspace flags and alignments
3750 Metaspace::ergo_initialize();
3751
3752 // Set bytecode rewriting flags
3753 set_bytecode_flags();
3754
3755 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3756 set_aggressive_opts_flags();
3757
3758 // Turn off biased locking for locking debug mode flags,
3759 // which are subtly different from each other but neither works with
3760 // biased locking
3761 if (UseHeavyMonitors
3762 #ifdef COMPILER1
3763 || !UseFastLocking
3764 #endif // COMPILER1
3765 ) {
3766 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3767 // flag set to true on command line; warn the user that they
3768 // can't enable biased locking here
3769 warning("Biased Locking is not supported with locking debug flags"
3770 "; ignoring UseBiasedLocking flag." );
3771 }
3772 UseBiasedLocking = false;
3773 }
3774
3775 #ifdef ZERO
3776 // Clear flags not supported on zero.
3777 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3778 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3779 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3780 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3781 #endif // CC_INTERP
3782
3783 #ifdef COMPILER2
3784 if (!UseBiasedLocking || EmitSync != 0) {
3785 UseOptoBiasInlining = false;
3786 }
3787 if (!EliminateLocks) {
3788 EliminateNestedLocks = false;
3789 }
3790 if (!Inline) {
3791 IncrementalInline = false;
3792 }
3793 #ifndef PRODUCT
3794 if (!IncrementalInline) {
3795 AlwaysIncrementalInline = false;
3796 }
3797 #endif
3798 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3799 // incremental inlining: bump MaxNodeLimit
3800 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3801 }
3802 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3803 // nothing to use the profiling, turn if off
3804 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3805 }
3806 if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) {
3807 // Doing the replace in parent maps helps speculation
3808 FLAG_SET_DEFAULT(ReplaceInParentMaps, true);
3809 }
3810 #endif
3811
3812 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3813 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3814 DebugNonSafepoints = true;
3815 }
3816
3817 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3818 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3819 }
3820
3821 #ifndef PRODUCT
3822 if (CompileTheWorld) {
3823 // Force NmethodSweeper to sweep whole CodeCache each time.
3824 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3825 NmethodSweepFraction = 1;
3826 }
3827 }
3828
3829 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3830 if (use_vm_log()) {
3831 LogVMOutput = true;
3832 }
3833 }
3834 #endif // PRODUCT
3835
3836 if (PrintCommandLineFlags) {
3837 CommandLineFlags::printSetFlags(tty);
3838 }
3839
3840 // Apply CPU specific policy for the BiasedLocking
3841 if (UseBiasedLocking) {
3842 if (!VM_Version::use_biased_locking() &&
3843 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3844 UseBiasedLocking = false;
3845 }
3846 }
3847
3848 return JNI_OK;
3849 }
3850
3851 jint Arguments::adjust_after_os() {
3852 if (UseNUMA) {
3853 if (UseParallelGC || UseParallelOldGC) {
3854 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3855 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3856 }
3857 }
3858 // UseNUMAInterleaving is set to ON for all collectors and
3859 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3860 // such as the parallel collector for Linux and Solaris will
3861 // interleave old gen and survivor spaces on top of NUMA
3862 // allocation policy for the eden space.
3863 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3864 // all platforms and ParallelGC on Windows will interleave all
3865 // of the heap spaces across NUMA nodes.
3866 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3867 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3868 }
3869 }
3870 return JNI_OK;
3871 }
3872
3873 int Arguments::PropertyList_count(SystemProperty* pl) {
3874 int count = 0;
3875 while(pl != NULL) {
3876 count++;
3877 pl = pl->next();
3878 }
3879 return count;
3880 }
3881
3882 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3883 assert(key != NULL, "just checking");
3884 SystemProperty* prop;
3885 for (prop = pl; prop != NULL; prop = prop->next()) {
3886 if (strcmp(key, prop->key()) == 0) return prop->value();
3887 }
3888 return NULL;
3889 }
3890
3891 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3892 int count = 0;
3893 const char* ret_val = NULL;
3894
3895 while(pl != NULL) {
3896 if(count >= index) {
3897 ret_val = pl->key();
3898 break;
3899 }
3900 count++;
3901 pl = pl->next();
3902 }
3903
3904 return ret_val;
3905 }
3906
3907 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3908 int count = 0;
3909 char* ret_val = NULL;
3910
3911 while(pl != NULL) {
3912 if(count >= index) {
3913 ret_val = pl->value();
3914 break;
3915 }
3916 count++;
3917 pl = pl->next();
3918 }
3919
3920 return ret_val;
3921 }
3922
3923 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3924 SystemProperty* p = *plist;
3925 if (p == NULL) {
3926 *plist = new_p;
3927 } else {
3928 while (p->next() != NULL) {
3929 p = p->next();
3930 }
3931 p->set_next(new_p);
3932 }
3933 }
3934
3935 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3936 if (plist == NULL)
3937 return;
3938
3939 SystemProperty* new_p = new SystemProperty(k, v, true);
3940 PropertyList_add(plist, new_p);
3941 }
3942
3943 // This add maintains unique property key in the list.
3944 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3945 if (plist == NULL)
3946 return;
3947
3948 // If property key exist then update with new value.
3949 SystemProperty* prop;
3950 for (prop = *plist; prop != NULL; prop = prop->next()) {
3951 if (strcmp(k, prop->key()) == 0) {
3952 if (append) {
3953 prop->append_value(v);
3954 } else {
3955 prop->set_value(v);
3956 }
3957 return;
3958 }
3959 }
3960
3961 PropertyList_add(plist, k, v);
3962 }
3963
3964 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3965 // Returns true if all of the source pointed by src has been copied over to
3966 // the destination buffer pointed by buf. Otherwise, returns false.
3967 // Notes:
3968 // 1. If the length (buflen) of the destination buffer excluding the
3969 // NULL terminator character is not long enough for holding the expanded
3970 // pid characters, it also returns false instead of returning the partially
3971 // expanded one.
3972 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3973 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3974 char* buf, size_t buflen) {
3975 const char* p = src;
3976 char* b = buf;
3977 const char* src_end = &src[srclen];
3978 char* buf_end = &buf[buflen - 1];
3979
3980 while (p < src_end && b < buf_end) {
3981 if (*p == '%') {
3982 switch (*(++p)) {
3983 case '%': // "%%" ==> "%"
3984 *b++ = *p++;
3985 break;
3986 case 'p': { // "%p" ==> current process id
3987 // buf_end points to the character before the last character so
3988 // that we could write '\0' to the end of the buffer.
3989 size_t buf_sz = buf_end - b + 1;
3990 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3991
3992 // if jio_snprintf fails or the buffer is not long enough to hold
3993 // the expanded pid, returns false.
3994 if (ret < 0 || ret >= (int)buf_sz) {
3995 return false;
3996 } else {
3997 b += ret;
3998 assert(*b == '\0', "fail in copy_expand_pid");
3999 if (p == src_end && b == buf_end + 1) {
4000 // reach the end of the buffer.
4001 return true;
4002 }
4003 }
4004 p++;
4005 break;
4006 }
4007 default :
4008 *b++ = '%';
4009 }
4010 } else {
4011 *b++ = *p++;
4012 }
4013 }
4014 *b = '\0';
4015 return (p == src_end); // return false if not all of the source was copied
4016 }