1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "compiler/compilerOracle.hpp"
31 #include "memory/allocation.inline.hpp"
32 #include "memory/cardTableRS.hpp"
33 #include "memory/genCollectedHeap.hpp"
34 #include "memory/referenceProcessor.hpp"
35 #include "memory/universe.inline.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "prims/jvmtiExport.hpp"
38 #include "runtime/arguments.hpp"
39 #include "runtime/arguments_ext.hpp"
40 #include "runtime/globals_extension.hpp"
41 #include "runtime/java.hpp"
42 #include "runtime/os.hpp"
43 #include "runtime/vm_version.hpp"
44 #include "services/management.hpp"
45 #include "services/memTracker.hpp"
46 #include "utilities/defaultStream.hpp"
47 #include "utilities/macros.hpp"
48 #include "utilities/stringUtils.hpp"
49 #include "utilities/taskqueue.hpp"
50 #if INCLUDE_ALL_GCS
51 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
52 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
53 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
54 #endif // INCLUDE_ALL_GCS
55
56 // Note: This is a special bug reporting site for the JVM
57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
58 #define DEFAULT_JAVA_LAUNCHER "generic"
59
60 #define UNSUPPORTED_GC_OPTION(gc) \
61 do { \
62 if (gc) { \
63 if (FLAG_IS_CMDLINE(gc)) { \
64 warning(#gc " is not supported in this VM. Using Serial GC."); \
65 } \
66 FLAG_SET_DEFAULT(gc, false); \
67 } \
68 } while(0)
69
70 char** Arguments::_jvm_flags_array = NULL;
71 int Arguments::_num_jvm_flags = 0;
72 char** Arguments::_jvm_args_array = NULL;
73 int Arguments::_num_jvm_args = 0;
74 char* Arguments::_java_command = NULL;
75 SystemProperty* Arguments::_system_properties = NULL;
76 const char* Arguments::_gc_log_filename = NULL;
77 bool Arguments::_has_profile = false;
78 size_t Arguments::_conservative_max_heap_alignment = 0;
79 size_t Arguments::_min_heap_size = 0;
80 uintx Arguments::_min_heap_free_ratio = 0;
81 uintx Arguments::_max_heap_free_ratio = 0;
82 Arguments::Mode Arguments::_mode = _mixed;
83 bool Arguments::_java_compiler = false;
84 bool Arguments::_xdebug_mode = false;
85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
87 int Arguments::_sun_java_launcher_pid = -1;
88 bool Arguments::_sun_java_launcher_is_altjvm = false;
89
90 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
93 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
94 bool Arguments::_ClipInlining = ClipInlining;
95 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
96 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
97
98 char* Arguments::SharedArchivePath = NULL;
99
100 AgentLibraryList Arguments::_libraryList;
101 AgentLibraryList Arguments::_agentList;
102
103 abort_hook_t Arguments::_abort_hook = NULL;
104 exit_hook_t Arguments::_exit_hook = NULL;
105 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
106
107
108 SystemProperty *Arguments::_sun_boot_library_path = NULL;
109 SystemProperty *Arguments::_java_library_path = NULL;
110 SystemProperty *Arguments::_java_home = NULL;
111 SystemProperty *Arguments::_java_class_path = NULL;
112 SystemProperty *Arguments::_sun_boot_class_path = NULL;
113
114 char* Arguments::_ext_dirs = NULL;
115
116 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
117 // part of the option string.
118 static bool match_option(const JavaVMOption *option, const char* name,
119 const char** tail) {
120 int len = (int)strlen(name);
121 if (strncmp(option->optionString, name, len) == 0) {
122 *tail = option->optionString + len;
123 return true;
124 } else {
125 return false;
126 }
127 }
128
129 // Check if 'option' matches 'name'. No "tail" is allowed.
130 static bool match_option(const JavaVMOption *option, const char* name) {
131 const char* tail = NULL;
132 bool result = match_option(option, name, &tail);
133 if (tail != NULL && *tail == '\0') {
134 return result;
135 } else {
136 return false;
137 }
138 }
139
140 // Return true if any of the strings in null-terminated array 'names' matches.
141 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
142 // the option must match exactly.
143 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
144 bool tail_allowed) {
145 for (/* empty */; *names != NULL; ++names) {
146 if (match_option(option, *names, tail)) {
147 if (**tail == '\0' || tail_allowed && **tail == ':') {
148 return true;
149 }
150 }
151 }
152 return false;
153 }
154
155 static void logOption(const char* opt) {
156 if (PrintVMOptions) {
157 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
158 }
159 }
160
161 // Process java launcher properties.
162 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
163 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
164 // sun.java.launcher.pid is defined.
165 // Must do this before setting up other system properties,
166 // as some of them may depend on launcher type.
167 for (int index = 0; index < args->nOptions; index++) {
168 const JavaVMOption* option = args->options + index;
169 const char* tail;
170
171 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
172 process_java_launcher_argument(tail, option->extraInfo);
173 continue;
174 }
175 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
176 if (strcmp(tail, "true") == 0) {
177 _sun_java_launcher_is_altjvm = true;
178 }
179 continue;
180 }
181 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
182 _sun_java_launcher_pid = atoi(tail);
183 continue;
184 }
185 }
186 }
187
188 // Initialize system properties key and value.
189 void Arguments::init_system_properties() {
190
191 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
192 "Java Virtual Machine Specification", false));
193 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
194 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
195 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
196
197 // Following are JVMTI agent writable properties.
198 // Properties values are set to NULL and they are
199 // os specific they are initialized in os::init_system_properties_values().
200 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
201 _java_library_path = new SystemProperty("java.library.path", NULL, true);
202 _java_home = new SystemProperty("java.home", NULL, true);
203 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
204
205 _java_class_path = new SystemProperty("java.class.path", "", true);
206
207 // Add to System Property list.
208 PropertyList_add(&_system_properties, _sun_boot_library_path);
209 PropertyList_add(&_system_properties, _java_library_path);
210 PropertyList_add(&_system_properties, _java_home);
211 PropertyList_add(&_system_properties, _java_class_path);
212 PropertyList_add(&_system_properties, _sun_boot_class_path);
213
214 // Set OS specific system properties values
215 os::init_system_properties_values();
216 }
217
218
219 // Update/Initialize System properties after JDK version number is known
220 void Arguments::init_version_specific_system_properties() {
221 enum { bufsz = 16 };
222 char buffer[bufsz];
223 const char* spec_vendor = "Sun Microsystems Inc.";
224 uint32_t spec_version = 0;
225
226 spec_vendor = "Oracle Corporation";
227 spec_version = JDK_Version::current().major_version();
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 * But now that HSX is no longer supported only options with a future
246 * accept_until value need to be listed, and the list can be pruned
247 * on each major release.
248 */
249 typedef struct {
250 const char* name;
251 JDK_Version obsoleted_in; // when the flag went away
252 JDK_Version accept_until; // which version to start denying the existence
253 } ObsoleteFlag;
254
255 static ObsoleteFlag obsolete_jvm_flags[] = {
256 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
257 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
258 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
259 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
260 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
261 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
262 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
263 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
264 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
265 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
266 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
267 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
268 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
269 #ifndef ZERO
270 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
271 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
272 #endif // ZERO
273 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) },
274 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) },
275 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) },
276 { "ThreadSafetyMargin", JDK_Version::jdk(9), JDK_Version::jdk(10) },
277 { NULL, JDK_Version(0), JDK_Version(0) }
278 };
279
280 // Returns true if the flag is obsolete and fits into the range specified
281 // for being ignored. In the case that the flag is ignored, the 'version'
282 // value is filled in with the version number when the flag became
283 // obsolete so that that value can be displayed to the user.
284 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
285 int i = 0;
286 assert(version != NULL, "Must provide a version buffer");
287 while (obsolete_jvm_flags[i].name != NULL) {
288 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
289 // <flag>=xxx form
290 // [-|+]<flag> form
291 size_t len = strlen(flag_status.name);
292 if ((strncmp(flag_status.name, s, len) == 0) &&
293 (strlen(s) == len)){
294 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
295 *version = flag_status.obsoleted_in;
296 return true;
297 }
298 }
299 i++;
300 }
301 return false;
302 }
303
304 // Constructs the system class path (aka boot class path) from the following
305 // components, in order:
306 //
307 // prefix // from -Xbootclasspath/p:...
308 // base // from os::get_system_properties() or -Xbootclasspath=
309 // suffix // from -Xbootclasspath/a:...
310 //
311 // This could be AllStatic, but it isn't needed after argument processing is
312 // complete.
313 class SysClassPath: public StackObj {
314 public:
315 SysClassPath(const char* base);
316 ~SysClassPath();
317
318 inline void set_base(const char* base);
319 inline void add_prefix(const char* prefix);
320 inline void add_suffix_to_prefix(const char* suffix);
321 inline void add_suffix(const char* suffix);
322 inline void reset_path(const char* base);
323
324 inline const char* get_base() const { return _items[_scp_base]; }
325 inline const char* get_prefix() const { return _items[_scp_prefix]; }
326 inline const char* get_suffix() const { return _items[_scp_suffix]; }
327
328 // Combine all the components into a single c-heap-allocated string; caller
329 // must free the string if/when no longer needed.
330 char* combined_path();
331
332 private:
333 // Utility routines.
334 static char* add_to_path(const char* path, const char* str, bool prepend);
335 static char* add_jars_to_path(char* path, const char* directory);
336
337 inline void reset_item_at(int index);
338
339 // Array indices for the items that make up the sysclasspath. All except the
340 // base are allocated in the C heap and freed by this class.
341 enum {
342 _scp_prefix, // from -Xbootclasspath/p:...
343 _scp_base, // the default sysclasspath
344 _scp_suffix, // from -Xbootclasspath/a:...
345 _scp_nitems // the number of items, must be last.
346 };
347
348 const char* _items[_scp_nitems];
349 };
350
351 SysClassPath::SysClassPath(const char* base) {
352 memset(_items, 0, sizeof(_items));
353 _items[_scp_base] = base;
354 }
355
356 SysClassPath::~SysClassPath() {
357 // Free everything except the base.
358 for (int i = 0; i < _scp_nitems; ++i) {
359 if (i != _scp_base) reset_item_at(i);
360 }
361 }
362
363 inline void SysClassPath::set_base(const char* base) {
364 _items[_scp_base] = base;
365 }
366
367 inline void SysClassPath::add_prefix(const char* prefix) {
368 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
369 }
370
371 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
372 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
373 }
374
375 inline void SysClassPath::add_suffix(const char* suffix) {
376 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
377 }
378
379 inline void SysClassPath::reset_item_at(int index) {
380 assert(index < _scp_nitems && index != _scp_base, "just checking");
381 if (_items[index] != NULL) {
382 FREE_C_HEAP_ARRAY(char, _items[index]);
383 _items[index] = NULL;
384 }
385 }
386
387 inline void SysClassPath::reset_path(const char* base) {
388 // Clear the prefix and suffix.
389 reset_item_at(_scp_prefix);
390 reset_item_at(_scp_suffix);
391 set_base(base);
392 }
393
394 //------------------------------------------------------------------------------
395
396
397 // Combine the bootclasspath elements, some of which may be null, into a single
398 // c-heap-allocated string.
399 char* SysClassPath::combined_path() {
400 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
401
402 size_t lengths[_scp_nitems];
403 size_t total_len = 0;
404
405 const char separator = *os::path_separator();
406
407 // Get the lengths.
408 int i;
409 for (i = 0; i < _scp_nitems; ++i) {
410 if (_items[i] != NULL) {
411 lengths[i] = strlen(_items[i]);
412 // Include space for the separator char (or a NULL for the last item).
413 total_len += lengths[i] + 1;
414 }
415 }
416 assert(total_len > 0, "empty sysclasspath not allowed");
417
418 // Copy the _items to a single string.
419 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
420 char* cp_tmp = cp;
421 for (i = 0; i < _scp_nitems; ++i) {
422 if (_items[i] != NULL) {
423 memcpy(cp_tmp, _items[i], lengths[i]);
424 cp_tmp += lengths[i];
425 *cp_tmp++ = separator;
426 }
427 }
428 *--cp_tmp = '\0'; // Replace the extra separator.
429 return cp;
430 }
431
432 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
433 char*
434 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
435 char *cp;
436
437 assert(str != NULL, "just checking");
438 if (path == NULL) {
439 size_t len = strlen(str) + 1;
440 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
441 memcpy(cp, str, len); // copy the trailing null
442 } else {
443 const char separator = *os::path_separator();
444 size_t old_len = strlen(path);
445 size_t str_len = strlen(str);
446 size_t len = old_len + str_len + 2;
447
448 if (prepend) {
449 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
450 char* cp_tmp = cp;
451 memcpy(cp_tmp, str, str_len);
452 cp_tmp += str_len;
453 *cp_tmp = separator;
454 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
455 FREE_C_HEAP_ARRAY(char, path);
456 } else {
457 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
458 char* cp_tmp = cp + old_len;
459 *cp_tmp = separator;
460 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
461 }
462 }
463 return cp;
464 }
465
466 // Scan the directory and append any jar or zip files found to path.
467 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
468 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
469 DIR* dir = os::opendir(directory);
470 if (dir == NULL) return path;
471
472 char dir_sep[2] = { '\0', '\0' };
473 size_t directory_len = strlen(directory);
474 const char fileSep = *os::file_separator();
475 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
476
477 /* Scan the directory for jars/zips, appending them to path. */
478 struct dirent *entry;
479 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
480 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
481 const char* name = entry->d_name;
482 const char* ext = name + strlen(name) - 4;
483 bool isJarOrZip = ext > name &&
484 (os::file_name_strcmp(ext, ".jar") == 0 ||
485 os::file_name_strcmp(ext, ".zip") == 0);
486 if (isJarOrZip) {
487 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
488 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
489 path = add_to_path(path, jarpath, false);
490 FREE_C_HEAP_ARRAY(char, jarpath);
491 }
492 }
493 FREE_C_HEAP_ARRAY(char, dbuf);
494 os::closedir(dir);
495 return path;
496 }
497
498 // Parses a memory size specification string.
499 static bool atomull(const char *s, julong* result) {
500 julong n = 0;
501 int args_read = 0;
502 bool is_hex = false;
503 // Skip leading 0[xX] for hexadecimal
504 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
505 s += 2;
506 is_hex = true;
507 args_read = sscanf(s, JULONG_FORMAT_X, &n);
508 } else {
509 args_read = sscanf(s, JULONG_FORMAT, &n);
510 }
511 if (args_read != 1) {
512 return false;
513 }
514 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
515 s++;
516 }
517 // 4705540: illegal if more characters are found after the first non-digit
518 if (strlen(s) > 1) {
519 return false;
520 }
521 switch (*s) {
522 case 'T': case 't':
523 *result = n * G * K;
524 // Check for overflow.
525 if (*result/((julong)G * K) != n) return false;
526 return true;
527 case 'G': case 'g':
528 *result = n * G;
529 if (*result/G != n) return false;
530 return true;
531 case 'M': case 'm':
532 *result = n * M;
533 if (*result/M != n) return false;
534 return true;
535 case 'K': case 'k':
536 *result = n * K;
537 if (*result/K != n) return false;
538 return true;
539 case '\0':
540 *result = n;
541 return true;
542 default:
543 return false;
544 }
545 }
546
547 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
548 if (size < min_size) return arg_too_small;
549 // Check that size will fit in a size_t (only relevant on 32-bit)
550 if (size > max_uintx) return arg_too_big;
551 return arg_in_range;
552 }
553
554 // Describe an argument out of range error
555 void Arguments::describe_range_error(ArgsRange errcode) {
556 switch(errcode) {
557 case arg_too_big:
558 jio_fprintf(defaultStream::error_stream(),
559 "The specified size exceeds the maximum "
560 "representable size.\n");
561 break;
562 case arg_too_small:
563 case arg_unreadable:
564 case arg_in_range:
565 // do nothing for now
566 break;
567 default:
568 ShouldNotReachHere();
569 }
570 }
571
572 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
573 return CommandLineFlags::boolAtPut(name, &value, origin);
574 }
575
576 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
577 double v;
578 if (sscanf(value, "%lf", &v) != 1) {
579 return false;
580 }
581
582 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
583 return true;
584 }
585 return false;
586 }
587
588 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
589 julong v;
590 intx intx_v;
591 bool is_neg = false;
592 // Check the sign first since atomull() parses only unsigned values.
593 if (*value == '-') {
594 if (!CommandLineFlags::intxAt(name, &intx_v)) {
595 return false;
596 }
597 value++;
598 is_neg = true;
599 }
600 if (!atomull(value, &v)) {
601 return false;
602 }
603 intx_v = (intx) v;
604 if (is_neg) {
605 intx_v = -intx_v;
606 }
607 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
608 return true;
609 }
610 uintx uintx_v = (uintx) v;
611 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
612 return true;
613 }
614 uint64_t uint64_t_v = (uint64_t) v;
615 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
616 return true;
617 }
618 size_t size_t_v = (size_t) v;
619 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
620 return true;
621 }
622 return false;
623 }
624
625 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
626 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
627 // Contract: CommandLineFlags always returns a pointer that needs freeing.
628 FREE_C_HEAP_ARRAY(char, value);
629 return true;
630 }
631
632 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
633 const char* old_value = "";
634 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
635 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
636 size_t new_len = strlen(new_value);
637 const char* value;
638 char* free_this_too = NULL;
639 if (old_len == 0) {
640 value = new_value;
641 } else if (new_len == 0) {
642 value = old_value;
643 } else {
644 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
645 // each new setting adds another LINE to the switch:
646 sprintf(buf, "%s\n%s", old_value, new_value);
647 value = buf;
648 free_this_too = buf;
649 }
650 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
651 // CommandLineFlags always returns a pointer that needs freeing.
652 FREE_C_HEAP_ARRAY(char, value);
653 if (free_this_too != NULL) {
654 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
655 FREE_C_HEAP_ARRAY(char, free_this_too);
656 }
657 return true;
658 }
659
660 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
661
662 // range of acceptable characters spelled out for portability reasons
663 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
664 #define BUFLEN 255
665 char name[BUFLEN+1];
666 char dummy;
667
668 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
669 return set_bool_flag(name, false, origin);
670 }
671 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
672 return set_bool_flag(name, true, origin);
673 }
674
675 char punct;
676 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
677 const char* value = strchr(arg, '=') + 1;
678 Flag* flag = Flag::find_flag(name, strlen(name));
679 if (flag != NULL && flag->is_ccstr()) {
680 if (flag->ccstr_accumulates()) {
681 return append_to_string_flag(name, value, origin);
682 } else {
683 if (value[0] == '\0') {
684 value = NULL;
685 }
686 return set_string_flag(name, value, origin);
687 }
688 }
689 }
690
691 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
692 const char* value = strchr(arg, '=') + 1;
693 // -XX:Foo:=xxx will reset the string flag to the given value.
694 if (value[0] == '\0') {
695 value = NULL;
696 }
697 return set_string_flag(name, value, origin);
698 }
699
700 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
701 #define SIGNED_NUMBER_RANGE "[-0123456789]"
702 #define NUMBER_RANGE "[0123456789]"
703 char value[BUFLEN + 1];
704 char value2[BUFLEN + 1];
705 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
706 // Looks like a floating-point number -- try again with more lenient format string
707 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
708 return set_fp_numeric_flag(name, value, origin);
709 }
710 }
711
712 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
713 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
714 return set_numeric_flag(name, value, origin);
715 }
716
717 return false;
718 }
719
720 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
721 assert(bldarray != NULL, "illegal argument");
722
723 if (arg == NULL) {
724 return;
725 }
726
727 int new_count = *count + 1;
728
729 // expand the array and add arg to the last element
730 if (*bldarray == NULL) {
731 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
732 } else {
733 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
734 }
735 (*bldarray)[*count] = os::strdup_check_oom(arg);
736 *count = new_count;
737 }
738
739 void Arguments::build_jvm_args(const char* arg) {
740 add_string(&_jvm_args_array, &_num_jvm_args, arg);
741 }
742
743 void Arguments::build_jvm_flags(const char* arg) {
744 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
745 }
746
747 // utility function to return a string that concatenates all
748 // strings in a given char** array
749 const char* Arguments::build_resource_string(char** args, int count) {
750 if (args == NULL || count == 0) {
751 return NULL;
752 }
753 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
754 for (int i = 1; i < count; i++) {
755 length += strlen(args[i]) + 1; // add 1 for a space
756 }
757 char* s = NEW_RESOURCE_ARRAY(char, length);
758 strcpy(s, args[0]);
759 for (int j = 1; j < count; j++) {
760 strcat(s, " ");
761 strcat(s, args[j]);
762 }
763 return (const char*) s;
764 }
765
766 void Arguments::print_on(outputStream* st) {
767 st->print_cr("VM Arguments:");
768 if (num_jvm_flags() > 0) {
769 st->print("jvm_flags: "); print_jvm_flags_on(st);
770 }
771 if (num_jvm_args() > 0) {
772 st->print("jvm_args: "); print_jvm_args_on(st);
773 }
774 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
775 if (_java_class_path != NULL) {
776 char* path = _java_class_path->value();
777 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
778 }
779 st->print_cr("Launcher Type: %s", _sun_java_launcher);
780 }
781
782 void Arguments::print_jvm_flags_on(outputStream* st) {
783 if (_num_jvm_flags > 0) {
784 for (int i=0; i < _num_jvm_flags; i++) {
785 st->print("%s ", _jvm_flags_array[i]);
786 }
787 st->cr();
788 }
789 }
790
791 void Arguments::print_jvm_args_on(outputStream* st) {
792 if (_num_jvm_args > 0) {
793 for (int i=0; i < _num_jvm_args; i++) {
794 st->print("%s ", _jvm_args_array[i]);
795 }
796 st->cr();
797 }
798 }
799
800 bool Arguments::process_argument(const char* arg,
801 jboolean ignore_unrecognized, Flag::Flags origin) {
802
803 JDK_Version since = JDK_Version();
804
805 if (parse_argument(arg, origin) || ignore_unrecognized) {
806 return true;
807 }
808
809 // Determine if the flag has '+', '-', or '=' characters.
810 bool has_plus_minus = (*arg == '+' || *arg == '-');
811 const char* const argname = has_plus_minus ? arg + 1 : arg;
812
813 size_t arg_len;
814 const char* equal_sign = strchr(argname, '=');
815 if (equal_sign == NULL) {
816 arg_len = strlen(argname);
817 } else {
818 arg_len = equal_sign - argname;
819 }
820
821 // Construct a string which consists only of the argument name without '+', '-', or '='.
822 char stripped_argname[256];
823 strncpy(stripped_argname, argname, arg_len);
824 stripped_argname[arg_len] = '\0'; //strncpy doesn't null terminate.
825
826 if (is_newly_obsolete(stripped_argname, &since)) {
827 char version[256];
828 since.to_string(version, sizeof(version));
829 warning("ignoring option %s; support was removed in %s", stripped_argname, version);
830 return true;
831 }
832
833 // For locked flags, report a custom error message if available.
834 // Otherwise, report the standard unrecognized VM option.
835 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
836 if (found_flag != NULL) {
837 char locked_message_buf[BUFLEN];
838 found_flag->get_locked_message(locked_message_buf, BUFLEN);
839 if (strlen(locked_message_buf) == 0) {
840 if (found_flag->is_bool() && !has_plus_minus) {
841 jio_fprintf(defaultStream::error_stream(),
842 "Missing +/- setting for VM option '%s'\n", argname);
843 } else if (!found_flag->is_bool() && has_plus_minus) {
844 jio_fprintf(defaultStream::error_stream(),
845 "Unexpected +/- setting in VM option '%s'\n", argname);
846 } else {
847 jio_fprintf(defaultStream::error_stream(),
848 "Improperly specified VM option '%s'\n", argname);
849 }
850 } else {
851 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
852 }
853 } else {
854 jio_fprintf(defaultStream::error_stream(),
855 "Unrecognized VM option '%s'\n", argname);
856 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
857 if (fuzzy_matched != NULL) {
858 jio_fprintf(defaultStream::error_stream(),
859 "Did you mean '%s%s%s'? ",
860 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
861 fuzzy_matched->_name,
862 (fuzzy_matched->is_bool()) ? "" : "=<value>");
863 }
864 }
865
866 // allow for commandline "commenting out" options like -XX:#+Verbose
867 return arg[0] == '#';
868 }
869
870 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
871 FILE* stream = fopen(file_name, "rb");
872 if (stream == NULL) {
873 if (should_exist) {
874 jio_fprintf(defaultStream::error_stream(),
875 "Could not open settings file %s\n", file_name);
876 return false;
877 } else {
878 return true;
879 }
880 }
881
882 char token[1024];
883 int pos = 0;
884
885 bool in_white_space = true;
886 bool in_comment = false;
887 bool in_quote = false;
888 char quote_c = 0;
889 bool result = true;
890
891 int c = getc(stream);
892 while(c != EOF && pos < (int)(sizeof(token)-1)) {
893 if (in_white_space) {
894 if (in_comment) {
895 if (c == '\n') in_comment = false;
896 } else {
897 if (c == '#') in_comment = true;
898 else if (!isspace(c)) {
899 in_white_space = false;
900 token[pos++] = c;
901 }
902 }
903 } else {
904 if (c == '\n' || (!in_quote && isspace(c))) {
905 // token ends at newline, or at unquoted whitespace
906 // this allows a way to include spaces in string-valued options
907 token[pos] = '\0';
908 logOption(token);
909 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
910 build_jvm_flags(token);
911 pos = 0;
912 in_white_space = true;
913 in_quote = false;
914 } else if (!in_quote && (c == '\'' || c == '"')) {
915 in_quote = true;
916 quote_c = c;
917 } else if (in_quote && (c == quote_c)) {
918 in_quote = false;
919 } else {
920 token[pos++] = c;
921 }
922 }
923 c = getc(stream);
924 }
925 if (pos > 0) {
926 token[pos] = '\0';
927 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
928 build_jvm_flags(token);
929 }
930 fclose(stream);
931 return result;
932 }
933
934 //=============================================================================================================
935 // Parsing of properties (-D)
936
937 const char* Arguments::get_property(const char* key) {
938 return PropertyList_get_value(system_properties(), key);
939 }
940
941 bool Arguments::add_property(const char* prop) {
942 const char* eq = strchr(prop, '=');
943 char* key;
944 // ns must be static--its address may be stored in a SystemProperty object.
945 const static char ns[1] = {0};
946 char* value = (char *)ns;
947
948 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
949 key = AllocateHeap(key_len + 1, mtInternal);
950 strncpy(key, prop, key_len);
951 key[key_len] = '\0';
952
953 if (eq != NULL) {
954 size_t value_len = strlen(prop) - key_len - 1;
955 value = AllocateHeap(value_len + 1, mtInternal);
956 strncpy(value, &prop[key_len + 1], value_len + 1);
957 }
958
959 if (strcmp(key, "java.compiler") == 0) {
960 process_java_compiler_argument(value);
961 FreeHeap(key);
962 if (eq != NULL) {
963 FreeHeap(value);
964 }
965 return true;
966 } else if (strcmp(key, "sun.java.command") == 0) {
967 _java_command = value;
968
969 // Record value in Arguments, but let it get passed to Java.
970 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
971 strcmp(key, "sun.java.launcher.pid") == 0) {
972 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
973 // private and are processed in process_sun_java_launcher_properties();
974 // the sun.java.launcher property is passed on to the java application
975 FreeHeap(key);
976 if (eq != NULL) {
977 FreeHeap(value);
978 }
979 return true;
980 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
981 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
982 // its value without going through the property list or making a Java call.
983 _java_vendor_url_bug = value;
984 } else if (strcmp(key, "sun.boot.library.path") == 0) {
985 PropertyList_unique_add(&_system_properties, key, value, true);
986 return true;
987 }
988 // Create new property and add at the end of the list
989 PropertyList_unique_add(&_system_properties, key, value);
990 return true;
991 }
992
993 //===========================================================================================================
994 // Setting int/mixed/comp mode flags
995
996 void Arguments::set_mode_flags(Mode mode) {
997 // Set up default values for all flags.
998 // If you add a flag to any of the branches below,
999 // add a default value for it here.
1000 set_java_compiler(false);
1001 _mode = mode;
1002
1003 // Ensure Agent_OnLoad has the correct initial values.
1004 // This may not be the final mode; mode may change later in onload phase.
1005 PropertyList_unique_add(&_system_properties, "java.vm.info",
1006 (char*)VM_Version::vm_info_string(), false);
1007
1008 UseInterpreter = true;
1009 UseCompiler = true;
1010 UseLoopCounter = true;
1011
1012 // Default values may be platform/compiler dependent -
1013 // use the saved values
1014 ClipInlining = Arguments::_ClipInlining;
1015 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1016 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1017 BackgroundCompilation = Arguments::_BackgroundCompilation;
1018 if (TieredCompilation) {
1019 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1020 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1021 }
1022 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1023 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1024 }
1025 }
1026
1027 // Change from defaults based on mode
1028 switch (mode) {
1029 default:
1030 ShouldNotReachHere();
1031 break;
1032 case _int:
1033 UseCompiler = false;
1034 UseLoopCounter = false;
1035 AlwaysCompileLoopMethods = false;
1036 UseOnStackReplacement = false;
1037 break;
1038 case _mixed:
1039 // same as default
1040 break;
1041 case _comp:
1042 UseInterpreter = false;
1043 BackgroundCompilation = false;
1044 ClipInlining = false;
1045 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1046 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1047 // compile a level 4 (C2) and then continue executing it.
1048 if (TieredCompilation) {
1049 Tier3InvokeNotifyFreqLog = 0;
1050 Tier4InvocationThreshold = 0;
1051 }
1052 break;
1053 }
1054 }
1055
1056 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1057 // Conflict: required to use shared spaces (-Xshare:on), but
1058 // incompatible command line options were chosen.
1059
1060 static void no_shared_spaces(const char* message) {
1061 if (RequireSharedSpaces) {
1062 jio_fprintf(defaultStream::error_stream(),
1063 "Class data sharing is inconsistent with other specified options.\n");
1064 vm_exit_during_initialization("Unable to use shared archive.", message);
1065 } else {
1066 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1067 }
1068 }
1069 #endif
1070
1071 // Returns threshold scaled with the value of scale.
1072 // If scale < 0.0, threshold is returned without scaling.
1073 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1074 if (scale == 1.0 || scale < 0.0) {
1075 return threshold;
1076 } else {
1077 return (intx)(threshold * scale);
1078 }
1079 }
1080
1081 // Returns freq_log scaled with the value of scale.
1082 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1083 // If scale < 0.0, freq_log is returned without scaling.
1084 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1085 // Check if scaling is necessary or if negative value was specified.
1086 if (scale == 1.0 || scale < 0.0) {
1087 return freq_log;
1088 }
1089 // Check values to avoid calculating log2 of 0.
1090 if (scale == 0.0 || freq_log == 0) {
1091 return 0;
1092 }
1093 // Determine the maximum notification frequency value currently supported.
1094 // The largest mask value that the interpreter/C1 can handle is
1095 // of length InvocationCounter::number_of_count_bits. Mask values are always
1096 // one bit shorter then the value of the notification frequency. Set
1097 // max_freq_bits accordingly.
1098 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1099 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1100 if (scaled_freq == 0) {
1101 // Return 0 right away to avoid calculating log2 of 0.
1102 return 0;
1103 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1104 return max_freq_bits;
1105 } else {
1106 return log2_intptr(scaled_freq);
1107 }
1108 }
1109
1110 void Arguments::set_tiered_flags() {
1111 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1112 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1113 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1114 }
1115 if (CompilationPolicyChoice < 2) {
1116 vm_exit_during_initialization(
1117 "Incompatible compilation policy selected", NULL);
1118 }
1119 // Increase the code cache size - tiered compiles a lot more.
1120 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1121 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1122 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1123 }
1124 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1125 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1126 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1127
1128 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1129 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1130 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1131 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1132 }
1133 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1134 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1135 }
1136 // Check consistency of code heap sizes
1137 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1138 jio_fprintf(defaultStream::error_stream(),
1139 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1140 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1141 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1142 vm_exit(1);
1143 }
1144 }
1145 }
1146 if (!UseInterpreter) { // -Xcomp
1147 Tier3InvokeNotifyFreqLog = 0;
1148 Tier4InvocationThreshold = 0;
1149 }
1150
1151 if (CompileThresholdScaling < 0) {
1152 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1153 }
1154
1155 // Scale tiered compilation thresholds.
1156 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1157 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1158 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1159 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1160
1161 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1162 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1163 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1164 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1165
1166 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1167 // once these thresholds become supported.
1168
1169 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1170 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1171
1172 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1173 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1174
1175 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1176
1177 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1178 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1179 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1180 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1181 }
1182 }
1183
1184 /**
1185 * Returns the minimum number of compiler threads needed to run the JVM. The following
1186 * configurations are possible.
1187 *
1188 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1189 * compiler threads is 0.
1190 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1191 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1192 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1193 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1194 * C1 can be used, so the minimum number of compiler threads is 1.
1195 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1196 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1197 * the minimum number of compiler threads is 2.
1198 */
1199 int Arguments::get_min_number_of_compiler_threads() {
1200 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1201 return 0; // case 1
1202 #else
1203 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1204 return 1; // case 2 or case 3
1205 }
1206 return 2; // case 4 (tiered)
1207 #endif
1208 }
1209
1210 #if INCLUDE_ALL_GCS
1211 static void disable_adaptive_size_policy(const char* collector_name) {
1212 if (UseAdaptiveSizePolicy) {
1213 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1214 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1215 collector_name);
1216 }
1217 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1218 }
1219 }
1220
1221 void Arguments::set_parnew_gc_flags() {
1222 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1223 "control point invariant");
1224 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1225 assert(UseParNewGC, "ParNew should always be used with CMS");
1226
1227 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1228 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1229 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1230 } else if (ParallelGCThreads == 0) {
1231 jio_fprintf(defaultStream::error_stream(),
1232 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1233 vm_exit(1);
1234 }
1235
1236 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1237 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1238 // we set them to 1024 and 1024.
1239 // See CR 6362902.
1240 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1241 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1242 }
1243 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1244 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1245 }
1246
1247 // When using compressed oops, we use local overflow stacks,
1248 // rather than using a global overflow list chained through
1249 // the klass word of the object's pre-image.
1250 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1251 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1252 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1253 }
1254 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1255 }
1256 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1257 }
1258
1259 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1260 // sparc/solaris for certain applications, but would gain from
1261 // further optimization and tuning efforts, and would almost
1262 // certainly gain from analysis of platform and environment.
1263 void Arguments::set_cms_and_parnew_gc_flags() {
1264 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1265 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1266 assert(UseParNewGC, "ParNew should always be used with CMS");
1267
1268 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1269 disable_adaptive_size_policy("UseConcMarkSweepGC");
1270
1271 set_parnew_gc_flags();
1272
1273 size_t max_heap = align_size_down(MaxHeapSize,
1274 CardTableRS::ct_max_alignment_constraint());
1275
1276 // Now make adjustments for CMS
1277 intx tenuring_default = (intx)6;
1278 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1279
1280 // Preferred young gen size for "short" pauses:
1281 // upper bound depends on # of threads and NewRatio.
1282 const uintx parallel_gc_threads =
1283 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1284 const size_t preferred_max_new_size_unaligned =
1285 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1286 size_t preferred_max_new_size =
1287 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1288
1289 // Unless explicitly requested otherwise, size young gen
1290 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1291
1292 // If either MaxNewSize or NewRatio is set on the command line,
1293 // assume the user is trying to set the size of the young gen.
1294 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1295
1296 // Set MaxNewSize to our calculated preferred_max_new_size unless
1297 // NewSize was set on the command line and it is larger than
1298 // preferred_max_new_size.
1299 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1300 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1301 } else {
1302 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1303 }
1304 if (PrintGCDetails && Verbose) {
1305 // Too early to use gclog_or_tty
1306 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1307 }
1308
1309 // Code along this path potentially sets NewSize and OldSize
1310 if (PrintGCDetails && Verbose) {
1311 // Too early to use gclog_or_tty
1312 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1313 " initial_heap_size: " SIZE_FORMAT
1314 " max_heap: " SIZE_FORMAT,
1315 min_heap_size(), InitialHeapSize, max_heap);
1316 }
1317 size_t min_new = preferred_max_new_size;
1318 if (FLAG_IS_CMDLINE(NewSize)) {
1319 min_new = NewSize;
1320 }
1321 if (max_heap > min_new && min_heap_size() > min_new) {
1322 // Unless explicitly requested otherwise, make young gen
1323 // at least min_new, and at most preferred_max_new_size.
1324 if (FLAG_IS_DEFAULT(NewSize)) {
1325 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1326 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1327 if (PrintGCDetails && Verbose) {
1328 // Too early to use gclog_or_tty
1329 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1330 }
1331 }
1332 // Unless explicitly requested otherwise, size old gen
1333 // so it's NewRatio x of NewSize.
1334 if (FLAG_IS_DEFAULT(OldSize)) {
1335 if (max_heap > NewSize) {
1336 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1337 if (PrintGCDetails && Verbose) {
1338 // Too early to use gclog_or_tty
1339 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1340 }
1341 }
1342 }
1343 }
1344 }
1345 // Unless explicitly requested otherwise, definitely
1346 // promote all objects surviving "tenuring_default" scavenges.
1347 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1348 FLAG_IS_DEFAULT(SurvivorRatio)) {
1349 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1350 }
1351 // If we decided above (or user explicitly requested)
1352 // `promote all' (via MaxTenuringThreshold := 0),
1353 // prefer minuscule survivor spaces so as not to waste
1354 // space for (non-existent) survivors
1355 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1356 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1357 }
1358
1359 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1360 // but rather the number of free blocks of a given size that are used when
1361 // replenishing the local per-worker free list caches.
1362 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1363 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1364 // OldPLAB sizing manually turned off: Use a larger default setting,
1365 // unless it was manually specified. This is because a too-low value
1366 // will slow down scavenges.
1367 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1368 } else {
1369 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1370 }
1371 }
1372
1373 // If either of the static initialization defaults have changed, note this
1374 // modification.
1375 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1376 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1377 }
1378 if (PrintGCDetails && Verbose) {
1379 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1380 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1381 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1382 }
1383 }
1384 #endif // INCLUDE_ALL_GCS
1385
1386 void set_object_alignment() {
1387 // Object alignment.
1388 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1389 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1390 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1391 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1392 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1393 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1394
1395 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1396 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1397
1398 // Oop encoding heap max
1399 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1400
1401 #if INCLUDE_ALL_GCS
1402 // Set CMS global values
1403 CompactibleFreeListSpace::set_cms_values();
1404 #endif // INCLUDE_ALL_GCS
1405 }
1406
1407 bool verify_object_alignment() {
1408 // Object alignment.
1409 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1410 jio_fprintf(defaultStream::error_stream(),
1411 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1412 (int)ObjectAlignmentInBytes);
1413 return false;
1414 }
1415 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1416 jio_fprintf(defaultStream::error_stream(),
1417 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1418 (int)ObjectAlignmentInBytes, BytesPerLong);
1419 return false;
1420 }
1421 // It does not make sense to have big object alignment
1422 // since a space lost due to alignment will be greater
1423 // then a saved space from compressed oops.
1424 if ((int)ObjectAlignmentInBytes > 256) {
1425 jio_fprintf(defaultStream::error_stream(),
1426 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1427 (int)ObjectAlignmentInBytes);
1428 return false;
1429 }
1430 // In case page size is very small.
1431 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1432 jio_fprintf(defaultStream::error_stream(),
1433 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1434 (int)ObjectAlignmentInBytes, os::vm_page_size());
1435 return false;
1436 }
1437 if(SurvivorAlignmentInBytes == 0) {
1438 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1439 } else {
1440 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1441 jio_fprintf(defaultStream::error_stream(),
1442 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1443 (int)SurvivorAlignmentInBytes);
1444 return false;
1445 }
1446 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1447 jio_fprintf(defaultStream::error_stream(),
1448 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1449 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1450 return false;
1451 }
1452 }
1453 return true;
1454 }
1455
1456 size_t Arguments::max_heap_for_compressed_oops() {
1457 // Avoid sign flip.
1458 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1459 // We need to fit both the NULL page and the heap into the memory budget, while
1460 // keeping alignment constraints of the heap. To guarantee the latter, as the
1461 // NULL page is located before the heap, we pad the NULL page to the conservative
1462 // maximum alignment that the GC may ever impose upon the heap.
1463 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1464 _conservative_max_heap_alignment);
1465
1466 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1467 NOT_LP64(ShouldNotReachHere(); return 0);
1468 }
1469
1470 bool Arguments::should_auto_select_low_pause_collector() {
1471 if (UseAutoGCSelectPolicy &&
1472 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1473 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1474 if (PrintGCDetails) {
1475 // Cannot use gclog_or_tty yet.
1476 tty->print_cr("Automatic selection of the low pause collector"
1477 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1478 }
1479 return true;
1480 }
1481 return false;
1482 }
1483
1484 void Arguments::set_use_compressed_oops() {
1485 #ifndef ZERO
1486 #ifdef _LP64
1487 // MaxHeapSize is not set up properly at this point, but
1488 // the only value that can override MaxHeapSize if we are
1489 // to use UseCompressedOops is InitialHeapSize.
1490 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1491
1492 if (max_heap_size <= max_heap_for_compressed_oops()) {
1493 #if !defined(COMPILER1) || defined(TIERED)
1494 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1495 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1496 }
1497 #endif
1498 } else {
1499 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1500 warning("Max heap size too large for Compressed Oops");
1501 FLAG_SET_DEFAULT(UseCompressedOops, false);
1502 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1503 }
1504 }
1505 #endif // _LP64
1506 #endif // ZERO
1507 }
1508
1509
1510 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1511 // set_use_compressed_oops().
1512 void Arguments::set_use_compressed_klass_ptrs() {
1513 #ifndef ZERO
1514 #ifdef _LP64
1515 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1516 if (!UseCompressedOops) {
1517 if (UseCompressedClassPointers) {
1518 warning("UseCompressedClassPointers requires UseCompressedOops");
1519 }
1520 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1521 } else {
1522 // Turn on UseCompressedClassPointers too
1523 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1524 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1525 }
1526 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1527 if (UseCompressedClassPointers) {
1528 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1529 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1530 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1531 }
1532 }
1533 }
1534 #endif // _LP64
1535 #endif // !ZERO
1536 }
1537
1538 void Arguments::set_conservative_max_heap_alignment() {
1539 // The conservative maximum required alignment for the heap is the maximum of
1540 // the alignments imposed by several sources: any requirements from the heap
1541 // itself, the collector policy and the maximum page size we may run the VM
1542 // with.
1543 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1544 #if INCLUDE_ALL_GCS
1545 if (UseParallelGC) {
1546 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1547 } else if (UseG1GC) {
1548 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1549 }
1550 #endif // INCLUDE_ALL_GCS
1551 _conservative_max_heap_alignment = MAX4(heap_alignment,
1552 (size_t)os::vm_allocation_granularity(),
1553 os::max_page_size(),
1554 CollectorPolicy::compute_heap_alignment());
1555 }
1556
1557 void Arguments::select_gc_ergonomically() {
1558 if (os::is_server_class_machine()) {
1559 if (should_auto_select_low_pause_collector()) {
1560 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1561 } else {
1562 FLAG_SET_ERGO(bool, UseParallelGC, true);
1563 }
1564 } else {
1565 FLAG_SET_ERGO(bool, UseSerialGC, true);
1566 }
1567 }
1568
1569 void Arguments::select_gc() {
1570 if (!gc_selected()) {
1571 select_gc_ergonomically();
1572 guarantee(gc_selected(), "No GC selected");
1573 }
1574 }
1575
1576 void Arguments::set_ergonomics_flags() {
1577 select_gc();
1578
1579 #ifdef COMPILER2
1580 // Shared spaces work fine with other GCs but causes bytecode rewriting
1581 // to be disabled, which hurts interpreter performance and decreases
1582 // server performance. When -server is specified, keep the default off
1583 // unless it is asked for. Future work: either add bytecode rewriting
1584 // at link time, or rewrite bytecodes in non-shared methods.
1585 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1586 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1587 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1588 }
1589 #endif
1590
1591 set_conservative_max_heap_alignment();
1592
1593 #ifndef ZERO
1594 #ifdef _LP64
1595 set_use_compressed_oops();
1596
1597 // set_use_compressed_klass_ptrs() must be called after calling
1598 // set_use_compressed_oops().
1599 set_use_compressed_klass_ptrs();
1600
1601 // Also checks that certain machines are slower with compressed oops
1602 // in vm_version initialization code.
1603 #endif // _LP64
1604 #endif // !ZERO
1605 }
1606
1607 void Arguments::set_parallel_gc_flags() {
1608 assert(UseParallelGC || UseParallelOldGC, "Error");
1609 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1610 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1611 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1612 }
1613 FLAG_SET_DEFAULT(UseParallelGC, true);
1614
1615 // If no heap maximum was requested explicitly, use some reasonable fraction
1616 // of the physical memory, up to a maximum of 1GB.
1617 FLAG_SET_DEFAULT(ParallelGCThreads,
1618 Abstract_VM_Version::parallel_worker_threads());
1619 if (ParallelGCThreads == 0) {
1620 jio_fprintf(defaultStream::error_stream(),
1621 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1622 vm_exit(1);
1623 }
1624
1625 if (UseAdaptiveSizePolicy) {
1626 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1627 // unless the user actually sets these flags.
1628 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1629 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1630 _min_heap_free_ratio = MinHeapFreeRatio;
1631 }
1632 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1633 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1634 _max_heap_free_ratio = MaxHeapFreeRatio;
1635 }
1636 }
1637
1638 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1639 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1640 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1641 // See CR 6362902 for details.
1642 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1643 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1644 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1645 }
1646 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1647 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1648 }
1649 }
1650
1651 if (UseParallelOldGC) {
1652 // Par compact uses lower default values since they are treated as
1653 // minimums. These are different defaults because of the different
1654 // interpretation and are not ergonomically set.
1655 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1656 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1657 }
1658 }
1659 }
1660
1661 void Arguments::set_g1_gc_flags() {
1662 assert(UseG1GC, "Error");
1663 #ifdef COMPILER1
1664 FastTLABRefill = false;
1665 #endif
1666 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1667 if (ParallelGCThreads == 0) {
1668 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1669 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1670 }
1671
1672 #if INCLUDE_ALL_GCS
1673 if (G1ConcRefinementThreads == 0) {
1674 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1675 }
1676 #endif
1677
1678 // MarkStackSize will be set (if it hasn't been set by the user)
1679 // when concurrent marking is initialized.
1680 // Its value will be based upon the number of parallel marking threads.
1681 // But we do set the maximum mark stack size here.
1682 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1683 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1684 }
1685
1686 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1687 // In G1, we want the default GC overhead goal to be higher than
1688 // say in PS. So we set it here to 10%. Otherwise the heap might
1689 // be expanded more aggressively than we would like it to. In
1690 // fact, even 10% seems to not be high enough in some cases
1691 // (especially small GC stress tests that the main thing they do
1692 // is allocation). We might consider increase it further.
1693 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1694 }
1695
1696 if (PrintGCDetails && Verbose) {
1697 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1698 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1699 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1700 }
1701 }
1702
1703 #if !INCLUDE_ALL_GCS
1704 #ifdef ASSERT
1705 static bool verify_serial_gc_flags() {
1706 return (UseSerialGC &&
1707 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1708 UseParallelGC || UseParallelOldGC));
1709 }
1710 #endif // ASSERT
1711 #endif // INCLUDE_ALL_GCS
1712
1713 void Arguments::set_gc_specific_flags() {
1714 #if INCLUDE_ALL_GCS
1715 // Set per-collector flags
1716 if (UseParallelGC || UseParallelOldGC) {
1717 set_parallel_gc_flags();
1718 } else if (UseConcMarkSweepGC) {
1719 set_cms_and_parnew_gc_flags();
1720 } else if (UseG1GC) {
1721 set_g1_gc_flags();
1722 }
1723 check_deprecated_gc_flags();
1724 if (AssumeMP && !UseSerialGC) {
1725 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1726 warning("If the number of processors is expected to increase from one, then"
1727 " you should configure the number of parallel GC threads appropriately"
1728 " using -XX:ParallelGCThreads=N");
1729 }
1730 }
1731 if (MinHeapFreeRatio == 100) {
1732 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1733 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1734 }
1735 #else // INCLUDE_ALL_GCS
1736 assert(verify_serial_gc_flags(), "SerialGC unset");
1737 #endif // INCLUDE_ALL_GCS
1738 }
1739
1740 julong Arguments::limit_by_allocatable_memory(julong limit) {
1741 julong max_allocatable;
1742 julong result = limit;
1743 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1744 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1745 }
1746 return result;
1747 }
1748
1749 // Use static initialization to get the default before parsing
1750 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1751
1752 void Arguments::set_heap_size() {
1753 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1754 // Deprecated flag
1755 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1756 }
1757
1758 const julong phys_mem =
1759 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1760 : (julong)MaxRAM;
1761
1762 // If the maximum heap size has not been set with -Xmx,
1763 // then set it as fraction of the size of physical memory,
1764 // respecting the maximum and minimum sizes of the heap.
1765 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1766 julong reasonable_max = phys_mem / MaxRAMFraction;
1767
1768 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1769 // Small physical memory, so use a minimum fraction of it for the heap
1770 reasonable_max = phys_mem / MinRAMFraction;
1771 } else {
1772 // Not-small physical memory, so require a heap at least
1773 // as large as MaxHeapSize
1774 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1775 }
1776 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1777 // Limit the heap size to ErgoHeapSizeLimit
1778 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1779 }
1780 if (UseCompressedOops) {
1781 // Limit the heap size to the maximum possible when using compressed oops
1782 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1783
1784 // HeapBaseMinAddress can be greater than default but not less than.
1785 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1786 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1787 // matches compressed oops printing flags
1788 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1789 jio_fprintf(defaultStream::error_stream(),
1790 "HeapBaseMinAddress must be at least " SIZE_FORMAT
1791 " (" SIZE_FORMAT "G) which is greater than value given "
1792 SIZE_FORMAT "\n",
1793 DefaultHeapBaseMinAddress,
1794 DefaultHeapBaseMinAddress/G,
1795 HeapBaseMinAddress);
1796 }
1797 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1798 }
1799 }
1800
1801 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1802 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1803 // but it should be not less than default MaxHeapSize.
1804 max_coop_heap -= HeapBaseMinAddress;
1805 }
1806 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1807 }
1808 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1809
1810 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1811 // An initial heap size was specified on the command line,
1812 // so be sure that the maximum size is consistent. Done
1813 // after call to limit_by_allocatable_memory because that
1814 // method might reduce the allocation size.
1815 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1816 }
1817
1818 if (PrintGCDetails && Verbose) {
1819 // Cannot use gclog_or_tty yet.
1820 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1821 }
1822 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1823 }
1824
1825 // If the minimum or initial heap_size have not been set or requested to be set
1826 // ergonomically, set them accordingly.
1827 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1828 julong reasonable_minimum = (julong)(OldSize + NewSize);
1829
1830 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1831
1832 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1833
1834 if (InitialHeapSize == 0) {
1835 julong reasonable_initial = phys_mem / InitialRAMFraction;
1836
1837 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1838 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1839
1840 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1841
1842 if (PrintGCDetails && Verbose) {
1843 // Cannot use gclog_or_tty yet.
1844 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1845 }
1846 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1847 }
1848 // If the minimum heap size has not been set (via -Xms),
1849 // synchronize with InitialHeapSize to avoid errors with the default value.
1850 if (min_heap_size() == 0) {
1851 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1852 if (PrintGCDetails && Verbose) {
1853 // Cannot use gclog_or_tty yet.
1854 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1855 }
1856 }
1857 }
1858 }
1859
1860 // This must be called after ergonomics.
1861 void Arguments::set_bytecode_flags() {
1862 if (!RewriteBytecodes) {
1863 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1864 }
1865 }
1866
1867 // Aggressive optimization flags -XX:+AggressiveOpts
1868 void Arguments::set_aggressive_opts_flags() {
1869 #ifdef COMPILER2
1870 if (AggressiveUnboxing) {
1871 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1872 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1873 } else if (!EliminateAutoBox) {
1874 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1875 AggressiveUnboxing = false;
1876 }
1877 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1878 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1879 } else if (!DoEscapeAnalysis) {
1880 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1881 AggressiveUnboxing = false;
1882 }
1883 }
1884 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1885 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1886 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1887 }
1888 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1889 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1890 }
1891
1892 // Feed the cache size setting into the JDK
1893 char buffer[1024];
1894 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1895 add_property(buffer);
1896 }
1897 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1898 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1899 }
1900 #endif
1901
1902 if (AggressiveOpts) {
1903 // Sample flag setting code
1904 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1905 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1906 // }
1907 }
1908 }
1909
1910 //===========================================================================================================
1911 // Parsing of java.compiler property
1912
1913 void Arguments::process_java_compiler_argument(char* arg) {
1914 // For backwards compatibility, Djava.compiler=NONE or ""
1915 // causes us to switch to -Xint mode UNLESS -Xdebug
1916 // is also specified.
1917 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1918 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1919 }
1920 }
1921
1922 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1923 _sun_java_launcher = os::strdup_check_oom(launcher);
1924 }
1925
1926 bool Arguments::created_by_java_launcher() {
1927 assert(_sun_java_launcher != NULL, "property must have value");
1928 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1929 }
1930
1931 bool Arguments::sun_java_launcher_is_altjvm() {
1932 return _sun_java_launcher_is_altjvm;
1933 }
1934
1935 //===========================================================================================================
1936 // Parsing of main arguments
1937
1938 bool Arguments::verify_interval(uintx val, uintx min,
1939 uintx max, const char* name) {
1940 // Returns true iff value is in the inclusive interval [min..max]
1941 // false, otherwise.
1942 if (val >= min && val <= max) {
1943 return true;
1944 }
1945 jio_fprintf(defaultStream::error_stream(),
1946 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1947 " and " UINTX_FORMAT "\n",
1948 name, val, min, max);
1949 return false;
1950 }
1951
1952 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1953 // Returns true if given value is at least specified min threshold
1954 // false, otherwise.
1955 if (val >= min ) {
1956 return true;
1957 }
1958 jio_fprintf(defaultStream::error_stream(),
1959 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1960 name, val, min);
1961 return false;
1962 }
1963
1964 bool Arguments::verify_percentage(uintx value, const char* name) {
1965 if (is_percentage(value)) {
1966 return true;
1967 }
1968 jio_fprintf(defaultStream::error_stream(),
1969 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1970 name, value);
1971 return false;
1972 }
1973
1974 // check if do gclog rotation
1975 // +UseGCLogFileRotation is a must,
1976 // no gc log rotation when log file not supplied or
1977 // NumberOfGCLogFiles is 0
1978 void check_gclog_consistency() {
1979 if (UseGCLogFileRotation) {
1980 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1981 jio_fprintf(defaultStream::output_stream(),
1982 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1983 "where num_of_file > 0\n"
1984 "GC log rotation is turned off\n");
1985 UseGCLogFileRotation = false;
1986 }
1987 }
1988
1989 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1990 FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K);
1991 jio_fprintf(defaultStream::output_stream(),
1992 "GCLogFileSize changed to minimum 8K\n");
1993 }
1994 }
1995
1996 // This function is called for -Xloggc:<filename>, it can be used
1997 // to check if a given file name(or string) conforms to the following
1998 // specification:
1999 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2000 // %p and %t only allowed once. We only limit usage of filename not path
2001 bool is_filename_valid(const char *file_name) {
2002 const char* p = file_name;
2003 char file_sep = os::file_separator()[0];
2004 const char* cp;
2005 // skip prefix path
2006 for (cp = file_name; *cp != '\0'; cp++) {
2007 if (*cp == '/' || *cp == file_sep) {
2008 p = cp + 1;
2009 }
2010 }
2011
2012 int count_p = 0;
2013 int count_t = 0;
2014 while (*p != '\0') {
2015 if ((*p >= '0' && *p <= '9') ||
2016 (*p >= 'A' && *p <= 'Z') ||
2017 (*p >= 'a' && *p <= 'z') ||
2018 *p == '-' ||
2019 *p == '_' ||
2020 *p == '.') {
2021 p++;
2022 continue;
2023 }
2024 if (*p == '%') {
2025 if(*(p + 1) == 'p') {
2026 p += 2;
2027 count_p ++;
2028 continue;
2029 }
2030 if (*(p + 1) == 't') {
2031 p += 2;
2032 count_t ++;
2033 continue;
2034 }
2035 }
2036 return false;
2037 }
2038 return count_p < 2 && count_t < 2;
2039 }
2040
2041 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2042 if (!is_percentage(min_heap_free_ratio)) {
2043 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2044 return false;
2045 }
2046 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2047 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2048 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2049 MaxHeapFreeRatio);
2050 return false;
2051 }
2052 // This does not set the flag itself, but stores the value in a safe place for later usage.
2053 _min_heap_free_ratio = min_heap_free_ratio;
2054 return true;
2055 }
2056
2057 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2058 if (!is_percentage(max_heap_free_ratio)) {
2059 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2060 return false;
2061 }
2062 if (max_heap_free_ratio < MinHeapFreeRatio) {
2063 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2064 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2065 MinHeapFreeRatio);
2066 return false;
2067 }
2068 // This does not set the flag itself, but stores the value in a safe place for later usage.
2069 _max_heap_free_ratio = max_heap_free_ratio;
2070 return true;
2071 }
2072
2073 // Check consistency of GC selection
2074 bool Arguments::check_gc_consistency() {
2075 check_gclog_consistency();
2076 // Ensure that the user has not selected conflicting sets
2077 // of collectors.
2078 uint i = 0;
2079 if (UseSerialGC) i++;
2080 if (UseConcMarkSweepGC) i++;
2081 if (UseParallelGC || UseParallelOldGC) i++;
2082 if (UseG1GC) i++;
2083 if (i > 1) {
2084 jio_fprintf(defaultStream::error_stream(),
2085 "Conflicting collector combinations in option list; "
2086 "please refer to the release notes for the combinations "
2087 "allowed\n");
2088 return false;
2089 }
2090
2091 if (UseConcMarkSweepGC && !UseParNewGC) {
2092 jio_fprintf(defaultStream::error_stream(),
2093 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2094 return false;
2095 }
2096
2097 if (UseParNewGC && !UseConcMarkSweepGC) {
2098 jio_fprintf(defaultStream::error_stream(),
2099 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2100 return false;
2101 }
2102
2103 return true;
2104 }
2105
2106 void Arguments::check_deprecated_gc_flags() {
2107 if (FLAG_IS_CMDLINE(UseParNewGC)) {
2108 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2109 }
2110 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2111 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2112 "and will likely be removed in future release");
2113 }
2114 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2115 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2116 "Use MaxRAMFraction instead.");
2117 }
2118 }
2119
2120 // Check stack pages settings
2121 bool Arguments::check_stack_pages()
2122 {
2123 bool status = true;
2124 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2125 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2126 // greater stack shadow pages can't generate instruction to bang stack
2127 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2128 return status;
2129 }
2130
2131 // Check the consistency of vm_init_args
2132 bool Arguments::check_vm_args_consistency() {
2133 // Method for adding checks for flag consistency.
2134 // The intent is to warn the user of all possible conflicts,
2135 // before returning an error.
2136 // Note: Needs platform-dependent factoring.
2137 bool status = true;
2138
2139 if (TLABRefillWasteFraction == 0) {
2140 jio_fprintf(defaultStream::error_stream(),
2141 "TLABRefillWasteFraction should be a denominator, "
2142 "not " SIZE_FORMAT "\n",
2143 TLABRefillWasteFraction);
2144 status = false;
2145 }
2146
2147 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2148 "AdaptiveSizePolicyWeight");
2149 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2150
2151 // Divide by bucket size to prevent a large size from causing rollover when
2152 // calculating amount of memory needed to be allocated for the String table.
2153 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2154 (max_uintx / StringTable::bucket_size()), "StringTable size");
2155
2156 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2157 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2158
2159 {
2160 // Using "else if" below to avoid printing two error messages if min > max.
2161 // This will also prevent us from reporting both min>100 and max>100 at the
2162 // same time, but that is less annoying than printing two identical errors IMHO.
2163 FormatBuffer<80> err_msg("%s","");
2164 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2165 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2166 status = false;
2167 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2168 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2169 status = false;
2170 }
2171 }
2172
2173 // Min/MaxMetaspaceFreeRatio
2174 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2175 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2176
2177 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2178 jio_fprintf(defaultStream::error_stream(),
2179 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2180 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2181 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2182 MinMetaspaceFreeRatio,
2183 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2184 MaxMetaspaceFreeRatio);
2185 status = false;
2186 }
2187
2188 // Trying to keep 100% free is not practical
2189 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2190
2191 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2192 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2193 }
2194
2195 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2196 // Settings to encourage splitting.
2197 if (!FLAG_IS_CMDLINE(NewRatio)) {
2198 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2199 }
2200 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2201 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2202 }
2203 }
2204
2205 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2206 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2207 }
2208
2209 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2210 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2211 if (GCTimeLimit == 100) {
2212 // Turn off gc-overhead-limit-exceeded checks
2213 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2214 }
2215
2216 status = status && check_gc_consistency();
2217 status = status && check_stack_pages();
2218
2219 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2220 "CMSIncrementalSafetyFactor");
2221
2222 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2223 // insists that we hold the requisite locks so that the iteration is
2224 // MT-safe. For the verification at start-up and shut-down, we don't
2225 // yet have a good way of acquiring and releasing these locks,
2226 // which are not visible at the CollectedHeap level. We want to
2227 // be able to acquire these locks and then do the iteration rather
2228 // than just disable the lock verification. This will be fixed under
2229 // bug 4788986.
2230 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2231 if (VerifyDuringStartup) {
2232 warning("Heap verification at start-up disabled "
2233 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2234 VerifyDuringStartup = false; // Disable verification at start-up
2235 }
2236
2237 if (VerifyBeforeExit) {
2238 warning("Heap verification at shutdown disabled "
2239 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2240 VerifyBeforeExit = false; // Disable verification at shutdown
2241 }
2242 }
2243
2244 // Note: only executed in non-PRODUCT mode
2245 if (!UseAsyncConcMarkSweepGC &&
2246 (ExplicitGCInvokesConcurrent ||
2247 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2248 jio_fprintf(defaultStream::error_stream(),
2249 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2250 " with -UseAsyncConcMarkSweepGC");
2251 status = false;
2252 }
2253
2254 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2255
2256 #if INCLUDE_ALL_GCS
2257 if (UseG1GC) {
2258 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2259 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2260 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2261
2262 status = status && verify_percentage(G1ConfidencePercent, "G1ConfidencePercent");
2263 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2264 "InitiatingHeapOccupancyPercent");
2265 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2266 "G1RefProcDrainInterval");
2267 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2268 "G1ConcMarkStepDurationMillis");
2269 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2270 "G1ConcRSHotCardLimit");
2271 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2272 "G1ConcRSLogCacheSize");
2273 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2274 "StringDeduplicationAgeThreshold");
2275 }
2276 if (UseConcMarkSweepGC) {
2277 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2278 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2279 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2280 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2281
2282 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2283
2284 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2285 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2286 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2287
2288 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2289
2290 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2291 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2292
2293 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2294 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2295 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2296
2297 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2298
2299 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2300
2301 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2302 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2303 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2304 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2305 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2306 }
2307
2308 if (UseParallelGC || UseParallelOldGC) {
2309 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2310 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2311
2312 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2313 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2314
2315 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2316 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2317
2318 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2319
2320 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2321 }
2322 #endif // INCLUDE_ALL_GCS
2323
2324 status = status && verify_interval(RefDiscoveryPolicy,
2325 ReferenceProcessor::DiscoveryPolicyMin,
2326 ReferenceProcessor::DiscoveryPolicyMax,
2327 "RefDiscoveryPolicy");
2328
2329 // Limit the lower bound of this flag to 1 as it is used in a division
2330 // expression.
2331 status = status && verify_interval(TLABWasteTargetPercent,
2332 1, 100, "TLABWasteTargetPercent");
2333
2334 status = status && verify_object_alignment();
2335
2336 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2337 "CompressedClassSpaceSize");
2338
2339 status = status && verify_interval(MarkStackSizeMax,
2340 1, (max_jint - 1), "MarkStackSizeMax");
2341 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2342
2343 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2344
2345 status = status && verify_min_value(HeapSizePerGCThread, (size_t) os::vm_page_size(), "HeapSizePerGCThread");
2346
2347 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2348
2349 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2350 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2351
2352 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2353
2354 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2355 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2356 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2357 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2358
2359 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2360 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2361
2362 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2363 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2364 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2365
2366 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2367 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2368
2369 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2370 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2371 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2372 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2373
2374 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2375 #ifdef COMPILER1
2376 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2377 #endif
2378 status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps");
2379
2380 if (PrintNMTStatistics) {
2381 #if INCLUDE_NMT
2382 if (MemTracker::tracking_level() == NMT_off) {
2383 #endif // INCLUDE_NMT
2384 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2385 PrintNMTStatistics = false;
2386 #if INCLUDE_NMT
2387 }
2388 #endif
2389 }
2390
2391 // Need to limit the extent of the padding to reasonable size.
2392 // 8K is well beyond the reasonable HW cache line size, even with the
2393 // aggressive prefetching, while still leaving the room for segregating
2394 // among the distinct pages.
2395 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2396 jio_fprintf(defaultStream::error_stream(),
2397 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2398 ContendedPaddingWidth, 0, 8192);
2399 status = false;
2400 }
2401
2402 // Need to enforce the padding not to break the existing field alignments.
2403 // It is sufficient to check against the largest type size.
2404 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2405 jio_fprintf(defaultStream::error_stream(),
2406 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2407 ContendedPaddingWidth, BytesPerLong);
2408 status = false;
2409 }
2410
2411 // Check lower bounds of the code cache
2412 // Template Interpreter code is approximately 3X larger in debug builds.
2413 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2414 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2415 jio_fprintf(defaultStream::error_stream(),
2416 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2417 os::vm_page_size()/K);
2418 status = false;
2419 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2420 jio_fprintf(defaultStream::error_stream(),
2421 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2422 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2423 status = false;
2424 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2425 jio_fprintf(defaultStream::error_stream(),
2426 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2427 min_code_cache_size/K);
2428 status = false;
2429 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2430 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2431 jio_fprintf(defaultStream::error_stream(),
2432 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2433 CODE_CACHE_SIZE_LIMIT/M);
2434 status = false;
2435 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2436 jio_fprintf(defaultStream::error_stream(),
2437 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2438 min_code_cache_size/K);
2439 status = false;
2440 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2441 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2442 jio_fprintf(defaultStream::error_stream(),
2443 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2444 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2445 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2446 status = false;
2447 }
2448
2449 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2450 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2451 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2452 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2453
2454
2455 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2456 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2457 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2458 // Check the minimum number of compiler threads
2459 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2460
2461 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2462 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2463 }
2464
2465 return status;
2466 }
2467
2468 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2469 const char* option_type) {
2470 if (ignore) return false;
2471
2472 const char* spacer = " ";
2473 if (option_type == NULL) {
2474 option_type = ++spacer; // Set both to the empty string.
2475 }
2476
2477 if (os::obsolete_option(option)) {
2478 jio_fprintf(defaultStream::error_stream(),
2479 "Obsolete %s%soption: %s\n", option_type, spacer,
2480 option->optionString);
2481 return false;
2482 } else {
2483 jio_fprintf(defaultStream::error_stream(),
2484 "Unrecognized %s%soption: %s\n", option_type, spacer,
2485 option->optionString);
2486 return true;
2487 }
2488 }
2489
2490 static const char* user_assertion_options[] = {
2491 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2492 };
2493
2494 static const char* system_assertion_options[] = {
2495 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2496 };
2497
2498 bool Arguments::parse_uintx(const char* value,
2499 uintx* uintx_arg,
2500 uintx min_size) {
2501
2502 // Check the sign first since atomull() parses only unsigned values.
2503 bool value_is_positive = !(*value == '-');
2504
2505 if (value_is_positive) {
2506 julong n;
2507 bool good_return = atomull(value, &n);
2508 if (good_return) {
2509 bool above_minimum = n >= min_size;
2510 bool value_is_too_large = n > max_uintx;
2511
2512 if (above_minimum && !value_is_too_large) {
2513 *uintx_arg = n;
2514 return true;
2515 }
2516 }
2517 }
2518 return false;
2519 }
2520
2521 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2522 julong* long_arg,
2523 julong min_size) {
2524 if (!atomull(s, long_arg)) return arg_unreadable;
2525 return check_memory_size(*long_arg, min_size);
2526 }
2527
2528 // Parse JavaVMInitArgs structure
2529
2530 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2531 // For components of the system classpath.
2532 SysClassPath scp(Arguments::get_sysclasspath());
2533 bool scp_assembly_required = false;
2534
2535 // Save default settings for some mode flags
2536 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2537 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2538 Arguments::_ClipInlining = ClipInlining;
2539 Arguments::_BackgroundCompilation = BackgroundCompilation;
2540 if (TieredCompilation) {
2541 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2542 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2543 }
2544
2545 // Setup flags for mixed which is the default
2546 set_mode_flags(_mixed);
2547
2548 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2549 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2550 if (result != JNI_OK) {
2551 return result;
2552 }
2553
2554 // Parse JavaVMInitArgs structure passed in
2555 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2556 if (result != JNI_OK) {
2557 return result;
2558 }
2559
2560 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2561 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2562 if (result != JNI_OK) {
2563 return result;
2564 }
2565
2566 // Do final processing now that all arguments have been parsed
2567 result = finalize_vm_init_args(&scp, scp_assembly_required);
2568 if (result != JNI_OK) {
2569 return result;
2570 }
2571
2572 return JNI_OK;
2573 }
2574
2575 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2576 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2577 // are dealing with -agentpath (case where name is a path), otherwise with
2578 // -agentlib
2579 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2580 char *_name;
2581 const char *_hprof = "hprof", *_jdwp = "jdwp";
2582 size_t _len_hprof, _len_jdwp, _len_prefix;
2583
2584 if (is_path) {
2585 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2586 return false;
2587 }
2588
2589 _name++; // skip past last path separator
2590 _len_prefix = strlen(JNI_LIB_PREFIX);
2591
2592 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2593 return false;
2594 }
2595
2596 _name += _len_prefix;
2597 _len_hprof = strlen(_hprof);
2598 _len_jdwp = strlen(_jdwp);
2599
2600 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2601 _name += _len_hprof;
2602 }
2603 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2604 _name += _len_jdwp;
2605 }
2606 else {
2607 return false;
2608 }
2609
2610 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2611 return false;
2612 }
2613
2614 return true;
2615 }
2616
2617 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2618 return true;
2619 }
2620
2621 return false;
2622 }
2623
2624 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2625 SysClassPath* scp_p,
2626 bool* scp_assembly_required_p,
2627 Flag::Flags origin) {
2628 // Remaining part of option string
2629 const char* tail;
2630
2631 // iterate over arguments
2632 for (int index = 0; index < args->nOptions; index++) {
2633 bool is_absolute_path = false; // for -agentpath vs -agentlib
2634
2635 const JavaVMOption* option = args->options + index;
2636
2637 if (!match_option(option, "-Djava.class.path", &tail) &&
2638 !match_option(option, "-Dsun.java.command", &tail) &&
2639 !match_option(option, "-Dsun.java.launcher", &tail)) {
2640
2641 // add all jvm options to the jvm_args string. This string
2642 // is used later to set the java.vm.args PerfData string constant.
2643 // the -Djava.class.path and the -Dsun.java.command options are
2644 // omitted from jvm_args string as each have their own PerfData
2645 // string constant object.
2646 build_jvm_args(option->optionString);
2647 }
2648
2649 // -verbose:[class/gc/jni]
2650 if (match_option(option, "-verbose", &tail)) {
2651 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2652 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2653 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2654 } else if (!strcmp(tail, ":gc")) {
2655 FLAG_SET_CMDLINE(bool, PrintGC, true);
2656 } else if (!strcmp(tail, ":jni")) {
2657 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2658 }
2659 // -da / -ea / -disableassertions / -enableassertions
2660 // These accept an optional class/package name separated by a colon, e.g.,
2661 // -da:java.lang.Thread.
2662 } else if (match_option(option, user_assertion_options, &tail, true)) {
2663 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2664 if (*tail == '\0') {
2665 JavaAssertions::setUserClassDefault(enable);
2666 } else {
2667 assert(*tail == ':', "bogus match by match_option()");
2668 JavaAssertions::addOption(tail + 1, enable);
2669 }
2670 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2671 } else if (match_option(option, system_assertion_options, &tail, false)) {
2672 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2673 JavaAssertions::setSystemClassDefault(enable);
2674 // -bootclasspath:
2675 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2676 scp_p->reset_path(tail);
2677 *scp_assembly_required_p = true;
2678 // -bootclasspath/a:
2679 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2680 scp_p->add_suffix(tail);
2681 *scp_assembly_required_p = true;
2682 // -bootclasspath/p:
2683 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2684 scp_p->add_prefix(tail);
2685 *scp_assembly_required_p = true;
2686 // -Xrun
2687 } else if (match_option(option, "-Xrun", &tail)) {
2688 if (tail != NULL) {
2689 const char* pos = strchr(tail, ':');
2690 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2691 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2692 name[len] = '\0';
2693
2694 char *options = NULL;
2695 if(pos != NULL) {
2696 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2697 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2698 }
2699 #if !INCLUDE_JVMTI
2700 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2701 jio_fprintf(defaultStream::error_stream(),
2702 "Profiling and debugging agents are not supported in this VM\n");
2703 return JNI_ERR;
2704 }
2705 #endif // !INCLUDE_JVMTI
2706 add_init_library(name, options);
2707 }
2708 // -agentlib and -agentpath
2709 } else if (match_option(option, "-agentlib:", &tail) ||
2710 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2711 if(tail != NULL) {
2712 const char* pos = strchr(tail, '=');
2713 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2714 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2715 name[len] = '\0';
2716
2717 char *options = NULL;
2718 if(pos != NULL) {
2719 options = os::strdup_check_oom(pos + 1, mtInternal);
2720 }
2721 #if !INCLUDE_JVMTI
2722 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2723 jio_fprintf(defaultStream::error_stream(),
2724 "Profiling and debugging agents are not supported in this VM\n");
2725 return JNI_ERR;
2726 }
2727 #endif // !INCLUDE_JVMTI
2728 add_init_agent(name, options, is_absolute_path);
2729 }
2730 // -javaagent
2731 } else if (match_option(option, "-javaagent:", &tail)) {
2732 #if !INCLUDE_JVMTI
2733 jio_fprintf(defaultStream::error_stream(),
2734 "Instrumentation agents are not supported in this VM\n");
2735 return JNI_ERR;
2736 #else
2737 if(tail != NULL) {
2738 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2739 add_init_agent("instrument", options, false);
2740 }
2741 #endif // !INCLUDE_JVMTI
2742 // -Xnoclassgc
2743 } else if (match_option(option, "-Xnoclassgc")) {
2744 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2745 // -Xconcgc
2746 } else if (match_option(option, "-Xconcgc")) {
2747 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2748 // -Xnoconcgc
2749 } else if (match_option(option, "-Xnoconcgc")) {
2750 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2751 // -Xbatch
2752 } else if (match_option(option, "-Xbatch")) {
2753 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2754 // -Xmn for compatibility with other JVM vendors
2755 } else if (match_option(option, "-Xmn", &tail)) {
2756 julong long_initial_young_size = 0;
2757 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2758 if (errcode != arg_in_range) {
2759 jio_fprintf(defaultStream::error_stream(),
2760 "Invalid initial young generation size: %s\n", option->optionString);
2761 describe_range_error(errcode);
2762 return JNI_EINVAL;
2763 }
2764 FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size);
2765 FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size);
2766 // -Xms
2767 } else if (match_option(option, "-Xms", &tail)) {
2768 julong long_initial_heap_size = 0;
2769 // an initial heap size of 0 means automatically determine
2770 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2771 if (errcode != arg_in_range) {
2772 jio_fprintf(defaultStream::error_stream(),
2773 "Invalid initial heap size: %s\n", option->optionString);
2774 describe_range_error(errcode);
2775 return JNI_EINVAL;
2776 }
2777 set_min_heap_size((size_t)long_initial_heap_size);
2778 // Currently the minimum size and the initial heap sizes are the same.
2779 // Can be overridden with -XX:InitialHeapSize.
2780 FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size);
2781 // -Xmx
2782 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2783 julong long_max_heap_size = 0;
2784 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2785 if (errcode != arg_in_range) {
2786 jio_fprintf(defaultStream::error_stream(),
2787 "Invalid maximum heap size: %s\n", option->optionString);
2788 describe_range_error(errcode);
2789 return JNI_EINVAL;
2790 }
2791 FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size);
2792 // Xmaxf
2793 } else if (match_option(option, "-Xmaxf", &tail)) {
2794 char* err;
2795 int maxf = (int)(strtod(tail, &err) * 100);
2796 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2797 jio_fprintf(defaultStream::error_stream(),
2798 "Bad max heap free percentage size: %s\n",
2799 option->optionString);
2800 return JNI_EINVAL;
2801 } else {
2802 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2803 }
2804 // Xminf
2805 } else if (match_option(option, "-Xminf", &tail)) {
2806 char* err;
2807 int minf = (int)(strtod(tail, &err) * 100);
2808 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2809 jio_fprintf(defaultStream::error_stream(),
2810 "Bad min heap free percentage size: %s\n",
2811 option->optionString);
2812 return JNI_EINVAL;
2813 } else {
2814 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2815 }
2816 // -Xss
2817 } else if (match_option(option, "-Xss", &tail)) {
2818 julong long_ThreadStackSize = 0;
2819 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2820 if (errcode != arg_in_range) {
2821 jio_fprintf(defaultStream::error_stream(),
2822 "Invalid thread stack size: %s\n", option->optionString);
2823 describe_range_error(errcode);
2824 return JNI_EINVAL;
2825 }
2826 // Internally track ThreadStackSize in units of 1024 bytes.
2827 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2828 round_to((int)long_ThreadStackSize, K) / K);
2829 // -Xoss
2830 } else if (match_option(option, "-Xoss", &tail)) {
2831 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2832 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2833 julong long_CodeCacheExpansionSize = 0;
2834 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2835 if (errcode != arg_in_range) {
2836 jio_fprintf(defaultStream::error_stream(),
2837 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2838 os::vm_page_size()/K);
2839 return JNI_EINVAL;
2840 }
2841 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2842 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2843 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2844 julong long_ReservedCodeCacheSize = 0;
2845
2846 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2847 if (errcode != arg_in_range) {
2848 jio_fprintf(defaultStream::error_stream(),
2849 "Invalid maximum code cache size: %s.\n", option->optionString);
2850 return JNI_EINVAL;
2851 }
2852 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2853 // -XX:NonNMethodCodeHeapSize=
2854 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2855 julong long_NonNMethodCodeHeapSize = 0;
2856
2857 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2858 if (errcode != arg_in_range) {
2859 jio_fprintf(defaultStream::error_stream(),
2860 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2861 return JNI_EINVAL;
2862 }
2863 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
2864 // -XX:ProfiledCodeHeapSize=
2865 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2866 julong long_ProfiledCodeHeapSize = 0;
2867
2868 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2869 if (errcode != arg_in_range) {
2870 jio_fprintf(defaultStream::error_stream(),
2871 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2872 return JNI_EINVAL;
2873 }
2874 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2875 // -XX:NonProfiledCodeHeapSizee=
2876 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2877 julong long_NonProfiledCodeHeapSize = 0;
2878
2879 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2880 if (errcode != arg_in_range) {
2881 jio_fprintf(defaultStream::error_stream(),
2882 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2883 return JNI_EINVAL;
2884 }
2885 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2886 //-XX:IncreaseFirstTierCompileThresholdAt=
2887 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2888 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2889 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2890 jio_fprintf(defaultStream::error_stream(),
2891 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2892 option->optionString);
2893 return JNI_EINVAL;
2894 }
2895 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2896 // -green
2897 } else if (match_option(option, "-green")) {
2898 jio_fprintf(defaultStream::error_stream(),
2899 "Green threads support not available\n");
2900 return JNI_EINVAL;
2901 // -native
2902 } else if (match_option(option, "-native")) {
2903 // HotSpot always uses native threads, ignore silently for compatibility
2904 // -Xsqnopause
2905 } else if (match_option(option, "-Xsqnopause")) {
2906 // EVM option, ignore silently for compatibility
2907 // -Xrs
2908 } else if (match_option(option, "-Xrs")) {
2909 // Classic/EVM option, new functionality
2910 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2911 } else if (match_option(option, "-Xusealtsigs")) {
2912 // change default internal VM signals used - lower case for back compat
2913 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2914 // -Xoptimize
2915 } else if (match_option(option, "-Xoptimize")) {
2916 // EVM option, ignore silently for compatibility
2917 // -Xprof
2918 } else if (match_option(option, "-Xprof")) {
2919 #if INCLUDE_FPROF
2920 _has_profile = true;
2921 #else // INCLUDE_FPROF
2922 jio_fprintf(defaultStream::error_stream(),
2923 "Flat profiling is not supported in this VM.\n");
2924 return JNI_ERR;
2925 #endif // INCLUDE_FPROF
2926 // -Xconcurrentio
2927 } else if (match_option(option, "-Xconcurrentio")) {
2928 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2929 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2930 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2931 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2932 FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2933
2934 // -Xinternalversion
2935 } else if (match_option(option, "-Xinternalversion")) {
2936 jio_fprintf(defaultStream::output_stream(), "%s\n",
2937 VM_Version::internal_vm_info_string());
2938 vm_exit(0);
2939 #ifndef PRODUCT
2940 // -Xprintflags
2941 } else if (match_option(option, "-Xprintflags")) {
2942 CommandLineFlags::printFlags(tty, false);
2943 vm_exit(0);
2944 #endif
2945 // -D
2946 } else if (match_option(option, "-D", &tail)) {
2947 const char* value;
2948 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2949 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2950 // abort if -Djava.endorsed.dirs is set
2951 jio_fprintf(defaultStream::output_stream(),
2952 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2953 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2954 return JNI_EINVAL;
2955 }
2956 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2957 *value != '\0' && strcmp(value, "\"\"") != 0) {
2958 // abort if -Djava.ext.dirs is set
2959 jio_fprintf(defaultStream::output_stream(),
2960 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2961 return JNI_EINVAL;
2962 }
2963
2964 if (!add_property(tail)) {
2965 return JNI_ENOMEM;
2966 }
2967 // Out of the box management support
2968 if (match_option(option, "-Dcom.sun.management", &tail)) {
2969 #if INCLUDE_MANAGEMENT
2970 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2971 #else
2972 jio_fprintf(defaultStream::output_stream(),
2973 "-Dcom.sun.management is not supported in this VM.\n");
2974 return JNI_ERR;
2975 #endif
2976 }
2977 // -Xint
2978 } else if (match_option(option, "-Xint")) {
2979 set_mode_flags(_int);
2980 // -Xmixed
2981 } else if (match_option(option, "-Xmixed")) {
2982 set_mode_flags(_mixed);
2983 // -Xcomp
2984 } else if (match_option(option, "-Xcomp")) {
2985 // for testing the compiler; turn off all flags that inhibit compilation
2986 set_mode_flags(_comp);
2987 // -Xshare:dump
2988 } else if (match_option(option, "-Xshare:dump")) {
2989 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2990 set_mode_flags(_int); // Prevent compilation, which creates objects
2991 // -Xshare:on
2992 } else if (match_option(option, "-Xshare:on")) {
2993 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2994 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2995 // -Xshare:auto
2996 } else if (match_option(option, "-Xshare:auto")) {
2997 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2998 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2999 // -Xshare:off
3000 } else if (match_option(option, "-Xshare:off")) {
3001 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3002 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3003 // -Xverify
3004 } else if (match_option(option, "-Xverify", &tail)) {
3005 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3006 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3007 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3008 } else if (strcmp(tail, ":remote") == 0) {
3009 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3010 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3011 } else if (strcmp(tail, ":none") == 0) {
3012 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3013 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3014 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3015 return JNI_EINVAL;
3016 }
3017 // -Xdebug
3018 } else if (match_option(option, "-Xdebug")) {
3019 // note this flag has been used, then ignore
3020 set_xdebug_mode(true);
3021 // -Xnoagent
3022 } else if (match_option(option, "-Xnoagent")) {
3023 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3024 } else if (match_option(option, "-Xboundthreads")) {
3025 // Ignore silently for compatibility
3026 } else if (match_option(option, "-Xloggc:", &tail)) {
3027 // Redirect GC output to the file. -Xloggc:<filename>
3028 // ostream_init_log(), when called will use this filename
3029 // to initialize a fileStream.
3030 _gc_log_filename = os::strdup_check_oom(tail);
3031 if (!is_filename_valid(_gc_log_filename)) {
3032 jio_fprintf(defaultStream::output_stream(),
3033 "Invalid file name for use with -Xloggc: Filename can only contain the "
3034 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3035 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3036 return JNI_EINVAL;
3037 }
3038 FLAG_SET_CMDLINE(bool, PrintGC, true);
3039 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3040
3041 // JNI hooks
3042 } else if (match_option(option, "-Xcheck", &tail)) {
3043 if (!strcmp(tail, ":jni")) {
3044 #if !INCLUDE_JNI_CHECK
3045 warning("JNI CHECKING is not supported in this VM");
3046 #else
3047 CheckJNICalls = true;
3048 #endif // INCLUDE_JNI_CHECK
3049 } else if (is_bad_option(option, args->ignoreUnrecognized,
3050 "check")) {
3051 return JNI_EINVAL;
3052 }
3053 } else if (match_option(option, "vfprintf")) {
3054 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3055 } else if (match_option(option, "exit")) {
3056 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3057 } else if (match_option(option, "abort")) {
3058 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3059 // -XX:+AggressiveHeap
3060 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3061
3062 // This option inspects the machine and attempts to set various
3063 // parameters to be optimal for long-running, memory allocation
3064 // intensive jobs. It is intended for machines with large
3065 // amounts of cpu and memory.
3066
3067 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3068 // VM, but we may not be able to represent the total physical memory
3069 // available (like having 8gb of memory on a box but using a 32bit VM).
3070 // Thus, we need to make sure we're using a julong for intermediate
3071 // calculations.
3072 julong initHeapSize;
3073 julong total_memory = os::physical_memory();
3074
3075 if (total_memory < (julong)256*M) {
3076 jio_fprintf(defaultStream::error_stream(),
3077 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3078 vm_exit(1);
3079 }
3080
3081 // The heap size is half of available memory, or (at most)
3082 // all of possible memory less 160mb (leaving room for the OS
3083 // when using ISM). This is the maximum; because adaptive sizing
3084 // is turned on below, the actual space used may be smaller.
3085
3086 initHeapSize = MIN2(total_memory / (julong)2,
3087 total_memory - (julong)160*M);
3088
3089 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3090
3091 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3092 FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize);
3093 FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize);
3094 // Currently the minimum size and the initial heap sizes are the same.
3095 set_min_heap_size(initHeapSize);
3096 }
3097 if (FLAG_IS_DEFAULT(NewSize)) {
3098 // Make the young generation 3/8ths of the total heap.
3099 FLAG_SET_CMDLINE(size_t, NewSize,
3100 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3101 FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize);
3102 }
3103
3104 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3105 FLAG_SET_DEFAULT(UseLargePages, true);
3106 #endif
3107
3108 // Increase some data structure sizes for efficiency
3109 FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize);
3110 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3111 FLAG_SET_CMDLINE(size_t, TLABSize, 256*K);
3112
3113 // See the OldPLABSize comment below, but replace 'after promotion'
3114 // with 'after copying'. YoungPLABSize is the size of the survivor
3115 // space per-gc-thread buffers. The default is 4kw.
3116 FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K); // Note: this is in words
3117
3118 // OldPLABSize is the size of the buffers in the old gen that
3119 // UseParallelGC uses to promote live data that doesn't fit in the
3120 // survivor spaces. At any given time, there's one for each gc thread.
3121 // The default size is 1kw. These buffers are rarely used, since the
3122 // survivor spaces are usually big enough. For specjbb, however, there
3123 // are occasions when there's lots of live data in the young gen
3124 // and we end up promoting some of it. We don't have a definite
3125 // explanation for why bumping OldPLABSize helps, but the theory
3126 // is that a bigger PLAB results in retaining something like the
3127 // original allocation order after promotion, which improves mutator
3128 // locality. A minor effect may be that larger PLABs reduce the
3129 // number of PLAB allocation events during gc. The value of 8kw
3130 // was arrived at by experimenting with specjbb.
3131 FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K); // Note: this is in words
3132
3133 // Enable parallel GC and adaptive generation sizing
3134 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3135 FLAG_SET_DEFAULT(ParallelGCThreads,
3136 Abstract_VM_Version::parallel_worker_threads());
3137
3138 // Encourage steady state memory management
3139 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3140
3141 // This appears to improve mutator locality
3142 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3143
3144 // Get around early Solaris scheduling bug
3145 // (affinity vs other jobs on system)
3146 // but disallow DR and offlining (5008695).
3147 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3148
3149 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3150 // and the last option wins.
3151 } else if (match_option(option, "-XX:+NeverTenure")) {
3152 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3153 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3154 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3155 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3156 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3157 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3158 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3159 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3160 uintx max_tenuring_thresh = 0;
3161 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3162 jio_fprintf(defaultStream::error_stream(),
3163 "Improperly specified VM option 'MaxTenuringThreshold=%s'\n", tail);
3164 return JNI_EINVAL;
3165 }
3166 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3167
3168 if (MaxTenuringThreshold == 0) {
3169 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3170 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3171 } else {
3172 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3173 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3174 }
3175 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3176 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3177 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3178 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3179 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3180 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3181 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3182 #if defined(DTRACE_ENABLED)
3183 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3184 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3185 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3186 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3187 #else // defined(DTRACE_ENABLED)
3188 jio_fprintf(defaultStream::error_stream(),
3189 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3190 return JNI_EINVAL;
3191 #endif // defined(DTRACE_ENABLED)
3192 #ifdef ASSERT
3193 } else if (match_option(option, "-XX:+FullGCALot")) {
3194 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3195 // disable scavenge before parallel mark-compact
3196 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3197 #endif
3198 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3199 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3200 julong stack_size = 0;
3201 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3202 if (errcode != arg_in_range) {
3203 jio_fprintf(defaultStream::error_stream(),
3204 "Invalid mark stack size: %s\n", option->optionString);
3205 describe_range_error(errcode);
3206 return JNI_EINVAL;
3207 }
3208 jio_fprintf(defaultStream::error_stream(),
3209 "Please use -XX:MarkStackSize in place of "
3210 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n");
3211 FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size);
3212 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3213 julong max_stack_size = 0;
3214 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3215 if (errcode != arg_in_range) {
3216 jio_fprintf(defaultStream::error_stream(),
3217 "Invalid maximum mark stack size: %s\n",
3218 option->optionString);
3219 describe_range_error(errcode);
3220 return JNI_EINVAL;
3221 }
3222 jio_fprintf(defaultStream::error_stream(),
3223 "Please use -XX:MarkStackSizeMax in place of "
3224 "-XX:CMSMarkStackSizeMax in the future\n");
3225 FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size);
3226 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3227 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3228 uintx conc_threads = 0;
3229 if (!parse_uintx(tail, &conc_threads, 1)) {
3230 jio_fprintf(defaultStream::error_stream(),
3231 "Invalid concurrent threads: %s\n", option->optionString);
3232 return JNI_EINVAL;
3233 }
3234 jio_fprintf(defaultStream::error_stream(),
3235 "Please use -XX:ConcGCThreads in place of "
3236 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n");
3237 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3238 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3239 julong max_direct_memory_size = 0;
3240 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3241 if (errcode != arg_in_range) {
3242 jio_fprintf(defaultStream::error_stream(),
3243 "Invalid maximum direct memory size: %s\n",
3244 option->optionString);
3245 describe_range_error(errcode);
3246 return JNI_EINVAL;
3247 }
3248 FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size);
3249 #if !INCLUDE_MANAGEMENT
3250 } else if (match_option(option, "-XX:+ManagementServer")) {
3251 jio_fprintf(defaultStream::error_stream(),
3252 "ManagementServer is not supported in this VM.\n");
3253 return JNI_ERR;
3254 #endif // INCLUDE_MANAGEMENT
3255 // CreateMinidumpOnCrash is removed, and replaced by CreateCoredumpOnCrash
3256 } else if (match_option(option, "-XX:+CreateMinidumpOnCrash")) {
3257 FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, true);
3258 jio_fprintf(defaultStream::output_stream(),
3259 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is on\n");
3260 } else if (match_option(option, "-XX:-CreateMinidumpOnCrash")) {
3261 FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, false);
3262 jio_fprintf(defaultStream::output_stream(),
3263 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is off\n");
3264 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3265 // Skip -XX:Flags= since that case has already been handled
3266 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3267 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3268 return JNI_EINVAL;
3269 }
3270 }
3271 // Unknown option
3272 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3273 return JNI_ERR;
3274 }
3275 }
3276
3277 // PrintSharedArchiveAndExit will turn on
3278 // -Xshare:on
3279 // -XX:+TraceClassPaths
3280 if (PrintSharedArchiveAndExit) {
3281 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3282 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3283 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3284 }
3285
3286 // Change the default value for flags which have different default values
3287 // when working with older JDKs.
3288 #ifdef LINUX
3289 if (JDK_Version::current().compare_major(6) <= 0 &&
3290 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3291 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3292 }
3293 #endif // LINUX
3294 fix_appclasspath();
3295 return JNI_OK;
3296 }
3297
3298 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3299 //
3300 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3301 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3302 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3303 // path is treated as the current directory.
3304 //
3305 // This causes problems with CDS, which requires that all directories specified in the classpath
3306 // must be empty. In most cases, applications do NOT want to load classes from the current
3307 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3308 // scripts compatible with CDS.
3309 void Arguments::fix_appclasspath() {
3310 if (IgnoreEmptyClassPaths) {
3311 const char separator = *os::path_separator();
3312 const char* src = _java_class_path->value();
3313
3314 // skip over all the leading empty paths
3315 while (*src == separator) {
3316 src ++;
3317 }
3318
3319 char* copy = os::strdup_check_oom(src, mtInternal);
3320
3321 // trim all trailing empty paths
3322 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3323 *tail = '\0';
3324 }
3325
3326 char from[3] = {separator, separator, '\0'};
3327 char to [2] = {separator, '\0'};
3328 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3329 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3330 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3331 }
3332
3333 _java_class_path->set_value(copy);
3334 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3335 }
3336
3337 if (!PrintSharedArchiveAndExit) {
3338 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3339 }
3340 }
3341
3342 static bool has_jar_files(const char* directory) {
3343 DIR* dir = os::opendir(directory);
3344 if (dir == NULL) return false;
3345
3346 struct dirent *entry;
3347 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3348 bool hasJarFile = false;
3349 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3350 const char* name = entry->d_name;
3351 const char* ext = name + strlen(name) - 4;
3352 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3353 }
3354 FREE_C_HEAP_ARRAY(char, dbuf);
3355 os::closedir(dir);
3356 return hasJarFile ;
3357 }
3358
3359 static int check_non_empty_dirs(const char* path) {
3360 const char separator = *os::path_separator();
3361 const char* const end = path + strlen(path);
3362 int nonEmptyDirs = 0;
3363 while (path < end) {
3364 const char* tmp_end = strchr(path, separator);
3365 if (tmp_end == NULL) {
3366 if (has_jar_files(path)) {
3367 nonEmptyDirs++;
3368 jio_fprintf(defaultStream::output_stream(),
3369 "Non-empty directory: %s\n", path);
3370 }
3371 path = end;
3372 } else {
3373 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3374 memcpy(dirpath, path, tmp_end - path);
3375 dirpath[tmp_end - path] = '\0';
3376 if (has_jar_files(dirpath)) {
3377 nonEmptyDirs++;
3378 jio_fprintf(defaultStream::output_stream(),
3379 "Non-empty directory: %s\n", dirpath);
3380 }
3381 FREE_C_HEAP_ARRAY(char, dirpath);
3382 path = tmp_end + 1;
3383 }
3384 }
3385 return nonEmptyDirs;
3386 }
3387
3388 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3389 // check if the default lib/endorsed directory exists; if so, error
3390 char path[JVM_MAXPATHLEN];
3391 const char* fileSep = os::file_separator();
3392 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3393
3394 if (CheckEndorsedAndExtDirs) {
3395 int nonEmptyDirs = 0;
3396 // check endorsed directory
3397 nonEmptyDirs += check_non_empty_dirs(path);
3398 // check the extension directories
3399 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3400 if (nonEmptyDirs > 0) {
3401 return JNI_ERR;
3402 }
3403 }
3404
3405 DIR* dir = os::opendir(path);
3406 if (dir != NULL) {
3407 jio_fprintf(defaultStream::output_stream(),
3408 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3409 "in modular form will be supported via the concept of upgradeable modules.\n");
3410 os::closedir(dir);
3411 return JNI_ERR;
3412 }
3413
3414 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3415 dir = os::opendir(path);
3416 if (dir != NULL) {
3417 jio_fprintf(defaultStream::output_stream(),
3418 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3419 "Use -classpath instead.\n.");
3420 os::closedir(dir);
3421 return JNI_ERR;
3422 }
3423
3424 if (scp_assembly_required) {
3425 // Assemble the bootclasspath elements into the final path.
3426 Arguments::set_sysclasspath(scp_p->combined_path());
3427 }
3428
3429 // This must be done after all arguments have been processed.
3430 // java_compiler() true means set to "NONE" or empty.
3431 if (java_compiler() && !xdebug_mode()) {
3432 // For backwards compatibility, we switch to interpreted mode if
3433 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3434 // not specified.
3435 set_mode_flags(_int);
3436 }
3437
3438 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3439 // but like -Xint, leave compilation thresholds unaffected.
3440 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3441 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3442 set_mode_flags(_int);
3443 }
3444
3445 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3446 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3447 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3448 }
3449
3450 #ifndef COMPILER2
3451 // Don't degrade server performance for footprint
3452 if (FLAG_IS_DEFAULT(UseLargePages) &&
3453 MaxHeapSize < LargePageHeapSizeThreshold) {
3454 // No need for large granularity pages w/small heaps.
3455 // Note that large pages are enabled/disabled for both the
3456 // Java heap and the code cache.
3457 FLAG_SET_DEFAULT(UseLargePages, false);
3458 }
3459
3460 #else
3461 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3462 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3463 }
3464 #endif
3465
3466 #ifndef TIERED
3467 // Tiered compilation is undefined.
3468 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3469 #endif
3470
3471 // If we are running in a headless jre, force java.awt.headless property
3472 // to be true unless the property has already been set.
3473 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3474 if (os::is_headless_jre()) {
3475 const char* headless = Arguments::get_property("java.awt.headless");
3476 if (headless == NULL) {
3477 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3478 if (headless_env == NULL) {
3479 if (!add_property("java.awt.headless=true")) {
3480 return JNI_ENOMEM;
3481 }
3482 } else {
3483 char buffer[256];
3484 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3485 if (!add_property(buffer)) {
3486 return JNI_ENOMEM;
3487 }
3488 }
3489 }
3490 }
3491
3492 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3493 // CMS can only be used with ParNew
3494 FLAG_SET_ERGO(bool, UseParNewGC, true);
3495 }
3496
3497 if (!check_vm_args_consistency()) {
3498 return JNI_ERR;
3499 }
3500
3501 return JNI_OK;
3502 }
3503
3504 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3505 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3506 scp_assembly_required_p);
3507 }
3508
3509 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3510 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3511 scp_assembly_required_p);
3512 }
3513
3514 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3515 char *buffer = ::getenv(name);
3516
3517 // Don't check this variable if user has special privileges
3518 // (e.g. unix su command).
3519 if (buffer == NULL || os::have_special_privileges()) {
3520 return JNI_OK;
3521 }
3522
3523 if ((buffer = os::strdup(buffer)) == NULL) {
3524 return JNI_ENOMEM;
3525 }
3526
3527 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3528 jio_fprintf(defaultStream::error_stream(),
3529 "Picked up %s: %s\n", name, buffer);
3530 char* rd = buffer; // pointer to the input string (rd)
3531 while (true) { // repeat for all options in the input string
3532 while (isspace(*rd)) rd++; // skip whitespace
3533 if (*rd == 0) break; // we re done when the input string is read completely
3534
3535 // The output, option string, overwrites the input string.
3536 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3537 // input string (rd).
3538 char* wrt = rd;
3539
3540 JavaVMOption option;
3541 option.optionString = wrt;
3542 options->append(option); // Fill in option
3543 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3544 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3545 int quote = *rd; // matching quote to look for
3546 rd++; // don't copy open quote
3547 while (*rd != quote) { // include everything (even spaces) up until quote
3548 if (*rd == 0) { // string termination means unmatched string
3549 jio_fprintf(defaultStream::error_stream(),
3550 "Unmatched quote in %s\n", name);
3551 delete options;
3552 os::free(buffer);
3553 return JNI_ERR;
3554 }
3555 *wrt++ = *rd++; // copy to option string
3556 }
3557 rd++; // don't copy close quote
3558 } else {
3559 *wrt++ = *rd++; // copy to option string
3560 }
3561 }
3562 // Need to check if we're done before writing a NULL,
3563 // because the write could be to the byte that rd is pointing to.
3564 if (*rd++ == 0) {
3565 *wrt = 0;
3566 break;
3567 }
3568 *wrt = 0; // Zero terminate option
3569 }
3570 JavaVMOption* options_arr =
3571 NEW_C_HEAP_ARRAY_RETURN_NULL(JavaVMOption, options->length(), mtInternal);
3572 if (options_arr == NULL) {
3573 delete options;
3574 os::free(buffer);
3575 return JNI_ENOMEM;
3576 }
3577 for (int i = 0; i < options->length(); i++) {
3578 options_arr[i] = options->at(i);
3579 }
3580
3581 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3582 JavaVMInitArgs vm_args;
3583 vm_args.version = JNI_VERSION_1_2;
3584 vm_args.options = options_arr;
3585 vm_args.nOptions = options->length();
3586 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3587
3588 if (PrintVMOptions) {
3589 const char* tail;
3590 for (int i = 0; i < vm_args.nOptions; i++) {
3591 const JavaVMOption *option = vm_args.options + i;
3592 if (match_option(option, "-XX:", &tail)) {
3593 logOption(tail);
3594 }
3595 }
3596 }
3597
3598 jint result = parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p,
3599 Flag::ENVIRON_VAR);
3600 FREE_C_HEAP_ARRAY(JavaVMOption, options_arr);
3601 delete options;
3602 os::free(buffer);
3603 return result;
3604 }
3605
3606 void Arguments::set_shared_spaces_flags() {
3607 if (DumpSharedSpaces) {
3608 if (RequireSharedSpaces) {
3609 warning("cannot dump shared archive while using shared archive");
3610 }
3611 UseSharedSpaces = false;
3612 #ifdef _LP64
3613 if (!UseCompressedOops || !UseCompressedClassPointers) {
3614 vm_exit_during_initialization(
3615 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3616 }
3617 } else {
3618 if (!UseCompressedOops || !UseCompressedClassPointers) {
3619 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3620 }
3621 #endif
3622 }
3623 }
3624
3625 #if !INCLUDE_ALL_GCS
3626 static void force_serial_gc() {
3627 FLAG_SET_DEFAULT(UseSerialGC, true);
3628 UNSUPPORTED_GC_OPTION(UseG1GC);
3629 UNSUPPORTED_GC_OPTION(UseParallelGC);
3630 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3631 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3632 UNSUPPORTED_GC_OPTION(UseParNewGC);
3633 }
3634 #endif // INCLUDE_ALL_GCS
3635
3636 // Sharing support
3637 // Construct the path to the archive
3638 static char* get_shared_archive_path() {
3639 char *shared_archive_path;
3640 if (SharedArchiveFile == NULL) {
3641 char jvm_path[JVM_MAXPATHLEN];
3642 os::jvm_path(jvm_path, sizeof(jvm_path));
3643 char *end = strrchr(jvm_path, *os::file_separator());
3644 if (end != NULL) *end = '\0';
3645 size_t jvm_path_len = strlen(jvm_path);
3646 size_t file_sep_len = strlen(os::file_separator());
3647 const size_t len = jvm_path_len + file_sep_len + 20;
3648 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3649 if (shared_archive_path != NULL) {
3650 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3651 jvm_path, os::file_separator());
3652 }
3653 } else {
3654 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3655 }
3656 return shared_archive_path;
3657 }
3658
3659 #ifndef PRODUCT
3660 // Determine whether LogVMOutput should be implicitly turned on.
3661 static bool use_vm_log() {
3662 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3663 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3664 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3665 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3666 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3667 return true;
3668 }
3669
3670 #ifdef COMPILER1
3671 if (PrintC1Statistics) {
3672 return true;
3673 }
3674 #endif // COMPILER1
3675
3676 #ifdef COMPILER2
3677 if (PrintOptoAssembly || PrintOptoStatistics) {
3678 return true;
3679 }
3680 #endif // COMPILER2
3681
3682 return false;
3683 }
3684 #endif // PRODUCT
3685
3686 // Parse entry point called from JNI_CreateJavaVM
3687
3688 jint Arguments::parse(const JavaVMInitArgs* args) {
3689
3690 // Remaining part of option string
3691 const char* tail;
3692
3693 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3694 const char* hotspotrc = ".hotspotrc";
3695 bool settings_file_specified = false;
3696 bool needs_hotspotrc_warning = false;
3697
3698 const char* flags_file;
3699 int index;
3700 for (index = 0; index < args->nOptions; index++) {
3701 const JavaVMOption *option = args->options + index;
3702 if (ArgumentsExt::process_options(option)) {
3703 continue;
3704 }
3705 if (match_option(option, "-XX:Flags=", &tail)) {
3706 flags_file = tail;
3707 settings_file_specified = true;
3708 continue;
3709 }
3710 if (match_option(option, "-XX:+PrintVMOptions")) {
3711 PrintVMOptions = true;
3712 continue;
3713 }
3714 if (match_option(option, "-XX:-PrintVMOptions")) {
3715 PrintVMOptions = false;
3716 continue;
3717 }
3718 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3719 IgnoreUnrecognizedVMOptions = true;
3720 continue;
3721 }
3722 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3723 IgnoreUnrecognizedVMOptions = false;
3724 continue;
3725 }
3726 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3727 CommandLineFlags::printFlags(tty, false);
3728 vm_exit(0);
3729 }
3730 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3731 #if INCLUDE_NMT
3732 // The launcher did not setup nmt environment variable properly.
3733 if (!MemTracker::check_launcher_nmt_support(tail)) {
3734 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3735 }
3736
3737 // Verify if nmt option is valid.
3738 if (MemTracker::verify_nmt_option()) {
3739 // Late initialization, still in single-threaded mode.
3740 if (MemTracker::tracking_level() >= NMT_summary) {
3741 MemTracker::init();
3742 }
3743 } else {
3744 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3745 }
3746 continue;
3747 #else
3748 jio_fprintf(defaultStream::error_stream(),
3749 "Native Memory Tracking is not supported in this VM\n");
3750 return JNI_ERR;
3751 #endif
3752 }
3753
3754 #ifndef PRODUCT
3755 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3756 CommandLineFlags::printFlags(tty, true);
3757 vm_exit(0);
3758 }
3759 #endif
3760 }
3761
3762 if (IgnoreUnrecognizedVMOptions) {
3763 // uncast const to modify the flag args->ignoreUnrecognized
3764 *(jboolean*)(&args->ignoreUnrecognized) = true;
3765 }
3766
3767 // Parse specified settings file
3768 if (settings_file_specified) {
3769 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3770 return JNI_EINVAL;
3771 }
3772 } else {
3773 #ifdef ASSERT
3774 // Parse default .hotspotrc settings file
3775 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3776 return JNI_EINVAL;
3777 }
3778 #else
3779 struct stat buf;
3780 if (os::stat(hotspotrc, &buf) == 0) {
3781 needs_hotspotrc_warning = true;
3782 }
3783 #endif
3784 }
3785
3786 if (PrintVMOptions) {
3787 for (index = 0; index < args->nOptions; index++) {
3788 const JavaVMOption *option = args->options + index;
3789 if (match_option(option, "-XX:", &tail)) {
3790 logOption(tail);
3791 }
3792 }
3793 }
3794
3795 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3796 jint result = parse_vm_init_args(args);
3797 if (result != JNI_OK) {
3798 return result;
3799 }
3800
3801 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3802 SharedArchivePath = get_shared_archive_path();
3803 if (SharedArchivePath == NULL) {
3804 return JNI_ENOMEM;
3805 }
3806
3807 // Set up VerifySharedSpaces
3808 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3809 VerifySharedSpaces = true;
3810 }
3811
3812 // Delay warning until here so that we've had a chance to process
3813 // the -XX:-PrintWarnings flag
3814 if (needs_hotspotrc_warning) {
3815 warning("%s file is present but has been ignored. "
3816 "Run with -XX:Flags=%s to load the file.",
3817 hotspotrc, hotspotrc);
3818 }
3819
3820 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3821 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3822 #endif
3823
3824 ArgumentsExt::report_unsupported_options();
3825
3826 #ifndef PRODUCT
3827 if (TraceBytecodesAt != 0) {
3828 TraceBytecodes = true;
3829 }
3830 if (CountCompiledCalls) {
3831 if (UseCounterDecay) {
3832 warning("UseCounterDecay disabled because CountCalls is set");
3833 UseCounterDecay = false;
3834 }
3835 }
3836 #endif // PRODUCT
3837
3838 if (ScavengeRootsInCode == 0) {
3839 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3840 warning("forcing ScavengeRootsInCode non-zero");
3841 }
3842 ScavengeRootsInCode = 1;
3843 }
3844
3845 if (PrintGCDetails) {
3846 // Turn on -verbose:gc options as well
3847 PrintGC = true;
3848 }
3849
3850 // Set object alignment values.
3851 set_object_alignment();
3852
3853 #if !INCLUDE_ALL_GCS
3854 force_serial_gc();
3855 #endif // INCLUDE_ALL_GCS
3856 #if !INCLUDE_CDS
3857 if (DumpSharedSpaces || RequireSharedSpaces) {
3858 jio_fprintf(defaultStream::error_stream(),
3859 "Shared spaces are not supported in this VM\n");
3860 return JNI_ERR;
3861 }
3862 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3863 warning("Shared spaces are not supported in this VM");
3864 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3865 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3866 }
3867 no_shared_spaces("CDS Disabled");
3868 #endif // INCLUDE_CDS
3869
3870 return JNI_OK;
3871 }
3872
3873 jint Arguments::apply_ergo() {
3874
3875 // Set flags based on ergonomics.
3876 set_ergonomics_flags();
3877
3878 set_shared_spaces_flags();
3879
3880 // Check the GC selections again.
3881 if (!check_gc_consistency()) {
3882 return JNI_EINVAL;
3883 }
3884
3885 if (TieredCompilation) {
3886 set_tiered_flags();
3887 } else {
3888 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3889 if (CompilationPolicyChoice >= 2) {
3890 vm_exit_during_initialization(
3891 "Incompatible compilation policy selected", NULL);
3892 }
3893 // Scale CompileThreshold
3894 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
3895 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
3896 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
3897 }
3898 }
3899
3900 #ifdef COMPILER2
3901 #ifndef PRODUCT
3902 if (PrintIdealGraphLevel > 0) {
3903 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3904 }
3905 #endif
3906 #endif
3907
3908 // Set heap size based on available physical memory
3909 set_heap_size();
3910
3911 ArgumentsExt::set_gc_specific_flags();
3912
3913 // Initialize Metaspace flags and alignments
3914 Metaspace::ergo_initialize();
3915
3916 // Set bytecode rewriting flags
3917 set_bytecode_flags();
3918
3919 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3920 set_aggressive_opts_flags();
3921
3922 // Turn off biased locking for locking debug mode flags,
3923 // which are subtly different from each other but neither works with
3924 // biased locking
3925 if (UseHeavyMonitors
3926 #ifdef COMPILER1
3927 || !UseFastLocking
3928 #endif // COMPILER1
3929 ) {
3930 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3931 // flag set to true on command line; warn the user that they
3932 // can't enable biased locking here
3933 warning("Biased Locking is not supported with locking debug flags"
3934 "; ignoring UseBiasedLocking flag." );
3935 }
3936 UseBiasedLocking = false;
3937 }
3938
3939 #ifdef ZERO
3940 // Clear flags not supported on zero.
3941 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3942 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3943 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3944 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3945 #endif // CC_INTERP
3946
3947 #ifdef COMPILER2
3948 if (!EliminateLocks) {
3949 EliminateNestedLocks = false;
3950 }
3951 if (!Inline) {
3952 IncrementalInline = false;
3953 }
3954 #ifndef PRODUCT
3955 if (!IncrementalInline) {
3956 AlwaysIncrementalInline = false;
3957 }
3958 #endif
3959 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3960 // nothing to use the profiling, turn if off
3961 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3962 }
3963 #endif
3964
3965 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3966 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3967 DebugNonSafepoints = true;
3968 }
3969
3970 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3971 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3972 }
3973
3974 #ifndef PRODUCT
3975 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3976 if (use_vm_log()) {
3977 LogVMOutput = true;
3978 }
3979 }
3980 #endif // PRODUCT
3981
3982 if (PrintCommandLineFlags) {
3983 CommandLineFlags::printSetFlags(tty);
3984 }
3985
3986 // Apply CPU specific policy for the BiasedLocking
3987 if (UseBiasedLocking) {
3988 if (!VM_Version::use_biased_locking() &&
3989 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3990 UseBiasedLocking = false;
3991 }
3992 }
3993 #ifdef COMPILER2
3994 if (!UseBiasedLocking || EmitSync != 0) {
3995 UseOptoBiasInlining = false;
3996 }
3997 #endif
3998
3999 return JNI_OK;
4000 }
4001
4002 jint Arguments::adjust_after_os() {
4003 if (UseNUMA) {
4004 if (UseParallelGC || UseParallelOldGC) {
4005 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4006 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4007 }
4008 }
4009 // UseNUMAInterleaving is set to ON for all collectors and
4010 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4011 // such as the parallel collector for Linux and Solaris will
4012 // interleave old gen and survivor spaces on top of NUMA
4013 // allocation policy for the eden space.
4014 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4015 // all platforms and ParallelGC on Windows will interleave all
4016 // of the heap spaces across NUMA nodes.
4017 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4018 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4019 }
4020 }
4021 return JNI_OK;
4022 }
4023
4024 int Arguments::PropertyList_count(SystemProperty* pl) {
4025 int count = 0;
4026 while(pl != NULL) {
4027 count++;
4028 pl = pl->next();
4029 }
4030 return count;
4031 }
4032
4033 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4034 assert(key != NULL, "just checking");
4035 SystemProperty* prop;
4036 for (prop = pl; prop != NULL; prop = prop->next()) {
4037 if (strcmp(key, prop->key()) == 0) return prop->value();
4038 }
4039 return NULL;
4040 }
4041
4042 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4043 int count = 0;
4044 const char* ret_val = NULL;
4045
4046 while(pl != NULL) {
4047 if(count >= index) {
4048 ret_val = pl->key();
4049 break;
4050 }
4051 count++;
4052 pl = pl->next();
4053 }
4054
4055 return ret_val;
4056 }
4057
4058 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4059 int count = 0;
4060 char* ret_val = NULL;
4061
4062 while(pl != NULL) {
4063 if(count >= index) {
4064 ret_val = pl->value();
4065 break;
4066 }
4067 count++;
4068 pl = pl->next();
4069 }
4070
4071 return ret_val;
4072 }
4073
4074 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4075 SystemProperty* p = *plist;
4076 if (p == NULL) {
4077 *plist = new_p;
4078 } else {
4079 while (p->next() != NULL) {
4080 p = p->next();
4081 }
4082 p->set_next(new_p);
4083 }
4084 }
4085
4086 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4087 if (plist == NULL)
4088 return;
4089
4090 SystemProperty* new_p = new SystemProperty(k, v, true);
4091 PropertyList_add(plist, new_p);
4092 }
4093
4094 void Arguments::PropertyList_add(SystemProperty *element) {
4095 PropertyList_add(&_system_properties, element);
4096 }
4097
4098 // This add maintains unique property key in the list.
4099 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4100 if (plist == NULL)
4101 return;
4102
4103 // If property key exist then update with new value.
4104 SystemProperty* prop;
4105 for (prop = *plist; prop != NULL; prop = prop->next()) {
4106 if (strcmp(k, prop->key()) == 0) {
4107 if (append) {
4108 prop->append_value(v);
4109 } else {
4110 prop->set_value(v);
4111 }
4112 return;
4113 }
4114 }
4115
4116 PropertyList_add(plist, k, v);
4117 }
4118
4119 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4120 // Returns true if all of the source pointed by src has been copied over to
4121 // the destination buffer pointed by buf. Otherwise, returns false.
4122 // Notes:
4123 // 1. If the length (buflen) of the destination buffer excluding the
4124 // NULL terminator character is not long enough for holding the expanded
4125 // pid characters, it also returns false instead of returning the partially
4126 // expanded one.
4127 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4128 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4129 char* buf, size_t buflen) {
4130 const char* p = src;
4131 char* b = buf;
4132 const char* src_end = &src[srclen];
4133 char* buf_end = &buf[buflen - 1];
4134
4135 while (p < src_end && b < buf_end) {
4136 if (*p == '%') {
4137 switch (*(++p)) {
4138 case '%': // "%%" ==> "%"
4139 *b++ = *p++;
4140 break;
4141 case 'p': { // "%p" ==> current process id
4142 // buf_end points to the character before the last character so
4143 // that we could write '\0' to the end of the buffer.
4144 size_t buf_sz = buf_end - b + 1;
4145 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4146
4147 // if jio_snprintf fails or the buffer is not long enough to hold
4148 // the expanded pid, returns false.
4149 if (ret < 0 || ret >= (int)buf_sz) {
4150 return false;
4151 } else {
4152 b += ret;
4153 assert(*b == '\0', "fail in copy_expand_pid");
4154 if (p == src_end && b == buf_end + 1) {
4155 // reach the end of the buffer.
4156 return true;
4157 }
4158 }
4159 p++;
4160 break;
4161 }
4162 default :
4163 *b++ = '%';
4164 }
4165 } else {
4166 *b++ = *p++;
4167 }
4168 }
4169 *b = '\0';
4170 return (p == src_end); // return false if not all of the source was copied
4171 }