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
96 char* Arguments::SharedArchivePath = NULL;
97
98 AgentLibraryList Arguments::_libraryList;
99 AgentLibraryList Arguments::_agentList;
100
101 abort_hook_t Arguments::_abort_hook = NULL;
102 exit_hook_t Arguments::_exit_hook = NULL;
103 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
104
105
106 SystemProperty *Arguments::_sun_boot_library_path = NULL;
107 SystemProperty *Arguments::_java_library_path = NULL;
108 SystemProperty *Arguments::_java_home = NULL;
109 SystemProperty *Arguments::_java_class_path = NULL;
110 SystemProperty *Arguments::_sun_boot_class_path = NULL;
111
112 char* Arguments::_ext_dirs = NULL;
113
114 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
115 // part of the option string.
116 static bool match_option(const JavaVMOption *option, const char* name,
117 const char** tail) {
118 int len = (int)strlen(name);
119 if (strncmp(option->optionString, name, len) == 0) {
120 *tail = option->optionString + len;
121 return true;
122 } else {
123 return false;
124 }
125 }
126
127 // Check if 'option' matches 'name'. No "tail" is allowed.
128 static bool match_option(const JavaVMOption *option, const char* name) {
129 const char* tail = NULL;
130 bool result = match_option(option, name, &tail);
131 if (tail != NULL && *tail == '\0') {
132 return result;
133 } else {
134 return false;
135 }
136 }
137
138 // Return true if any of the strings in null-terminated array 'names' matches.
139 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
140 // the option must match exactly.
141 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
142 bool tail_allowed) {
143 for (/* empty */; *names != NULL; ++names) {
144 if (match_option(option, *names, tail)) {
145 if (**tail == '\0' || tail_allowed && **tail == ':') {
146 return true;
147 }
148 }
149 }
150 return false;
151 }
152
153 static void logOption(const char* opt) {
154 if (PrintVMOptions) {
155 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
156 }
157 }
158
159 // Process java launcher properties.
160 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
161 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
162 // sun.java.launcher.pid is defined.
163 // Must do this before setting up other system properties,
164 // as some of them may depend on launcher type.
165 for (int index = 0; index < args->nOptions; index++) {
166 const JavaVMOption* option = args->options + index;
167 const char* tail;
168
169 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
170 process_java_launcher_argument(tail, option->extraInfo);
171 continue;
172 }
173 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
174 if (strcmp(tail, "true") == 0) {
175 _sun_java_launcher_is_altjvm = true;
176 }
177 continue;
178 }
179 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
180 _sun_java_launcher_pid = atoi(tail);
181 continue;
182 }
183 }
184 }
185
186 // Initialize system properties key and value.
187 void Arguments::init_system_properties() {
188
189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
190 "Java Virtual Machine Specification", false));
191 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
192 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
193 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
194
195 // Following are JVMTI agent writable properties.
196 // Properties values are set to NULL and they are
197 // os specific they are initialized in os::init_system_properties_values().
198 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
199 _java_library_path = new SystemProperty("java.library.path", NULL, true);
200 _java_home = new SystemProperty("java.home", NULL, true);
201 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
202
203 _java_class_path = new SystemProperty("java.class.path", "", true);
204
205 // Add to System Property list.
206 PropertyList_add(&_system_properties, _sun_boot_library_path);
207 PropertyList_add(&_system_properties, _java_library_path);
208 PropertyList_add(&_system_properties, _java_home);
209 PropertyList_add(&_system_properties, _java_class_path);
210 PropertyList_add(&_system_properties, _sun_boot_class_path);
211
212 // Set OS specific system properties values
213 os::init_system_properties_values();
214 }
215
216
217 // Update/Initialize System properties after JDK version number is known
218 void Arguments::init_version_specific_system_properties() {
219 enum { bufsz = 16 };
220 char buffer[bufsz];
221 const char* spec_vendor = "Sun Microsystems Inc.";
222 uint32_t spec_version = 0;
223
224 spec_vendor = "Oracle Corporation";
225 spec_version = JDK_Version::current().major_version();
226 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
227
228 PropertyList_add(&_system_properties,
229 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
230 PropertyList_add(&_system_properties,
231 new SystemProperty("java.vm.specification.version", buffer, false));
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
234 }
235
236 /**
237 * Provide a slightly more user-friendly way of eliminating -XX flags.
238 * When a flag is eliminated, it can be added to this list in order to
239 * continue accepting this flag on the command-line, while issuing a warning
240 * and ignoring the value. Once the JDK version reaches the 'accept_until'
241 * limit, we flatly refuse to admit the existence of the flag. This allows
242 * a flag to die correctly over JDK releases using HSX.
243 * But now that HSX is no longer supported only options with a future
244 * accept_until value need to be listed, and the list can be pruned
245 * on each major release.
246 */
247 typedef struct {
248 const char* name;
249 JDK_Version obsoleted_in; // when the flag went away
250 JDK_Version accept_until; // which version to start denying the existence
251 } ObsoleteFlag;
252
253 static ObsoleteFlag obsolete_jvm_flags[] = {
254 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
255 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
256 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
257 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
258 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
259 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
260 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
261 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
262 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
263 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
264 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
265 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
266 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
267 #ifndef ZERO
268 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
269 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
270 #endif // ZERO
271 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) },
272 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) },
273 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) },
274 { "LazyBootClassLoader", JDK_Version::jdk(9), JDK_Version::jdk(10) },
275 { NULL, JDK_Version(0), JDK_Version(0) }
276 };
277
278 // Returns true if the flag is obsolete and fits into the range specified
279 // for being ignored. In the case that the flag is ignored, the 'version'
280 // value is filled in with the version number when the flag became
281 // obsolete so that that value can be displayed to the user.
282 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
283 int i = 0;
284 assert(version != NULL, "Must provide a version buffer");
285 while (obsolete_jvm_flags[i].name != NULL) {
286 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
287 // <flag>=xxx form
288 // [-|+]<flag> form
289 size_t len = strlen(flag_status.name);
290 if (((strncmp(flag_status.name, s, len) == 0) &&
291 (strlen(s) == len)) ||
292 ((s[0] == '+' || s[0] == '-') &&
293 (strncmp(flag_status.name, &s[1], len) == 0) &&
294 (strlen(&s[1]) == len))) {
295 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
296 *version = flag_status.obsoleted_in;
297 return true;
298 }
299 }
300 i++;
301 }
302 return false;
303 }
304
305 // Constructs the system class path (aka boot class path) from the following
306 // components, in order:
307 //
308 // prefix // from -Xbootclasspath/p:...
309 // base // from os::get_system_properties() or -Xbootclasspath=
310 // suffix // from -Xbootclasspath/a:...
311 //
312 // This could be AllStatic, but it isn't needed after argument processing is
313 // complete.
314 class SysClassPath: public StackObj {
315 public:
316 SysClassPath(const char* base);
317 ~SysClassPath();
318
319 inline void set_base(const char* base);
320 inline void add_prefix(const char* prefix);
321 inline void add_suffix_to_prefix(const char* suffix);
322 inline void add_suffix(const char* suffix);
323 inline void reset_path(const char* base);
324
325 inline const char* get_base() const { return _items[_scp_base]; }
326 inline const char* get_prefix() const { return _items[_scp_prefix]; }
327 inline const char* get_suffix() const { return _items[_scp_suffix]; }
328
329 // Combine all the components into a single c-heap-allocated string; caller
330 // must free the string if/when no longer needed.
331 char* combined_path();
332
333 private:
334 // Utility routines.
335 static char* add_to_path(const char* path, const char* str, bool prepend);
336 static char* add_jars_to_path(char* path, const char* directory);
337
338 inline void reset_item_at(int index);
339
340 // Array indices for the items that make up the sysclasspath. All except the
341 // base are allocated in the C heap and freed by this class.
342 enum {
343 _scp_prefix, // from -Xbootclasspath/p:...
344 _scp_base, // the default sysclasspath
345 _scp_suffix, // from -Xbootclasspath/a:...
346 _scp_nitems // the number of items, must be last.
347 };
348
349 const char* _items[_scp_nitems];
350 };
351
352 SysClassPath::SysClassPath(const char* base) {
353 memset(_items, 0, sizeof(_items));
354 _items[_scp_base] = base;
355 }
356
357 SysClassPath::~SysClassPath() {
358 // Free everything except the base.
359 for (int i = 0; i < _scp_nitems; ++i) {
360 if (i != _scp_base) reset_item_at(i);
361 }
362 }
363
364 inline void SysClassPath::set_base(const char* base) {
365 _items[_scp_base] = base;
366 }
367
368 inline void SysClassPath::add_prefix(const char* prefix) {
369 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
370 }
371
372 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
373 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
374 }
375
376 inline void SysClassPath::add_suffix(const char* suffix) {
377 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
378 }
379
380 inline void SysClassPath::reset_item_at(int index) {
381 assert(index < _scp_nitems && index != _scp_base, "just checking");
382 if (_items[index] != NULL) {
383 FREE_C_HEAP_ARRAY(char, _items[index]);
384 _items[index] = NULL;
385 }
386 }
387
388 inline void SysClassPath::reset_path(const char* base) {
389 // Clear the prefix and suffix.
390 reset_item_at(_scp_prefix);
391 reset_item_at(_scp_suffix);
392 set_base(base);
393 }
394
395 //------------------------------------------------------------------------------
396
397
398 // Combine the bootclasspath elements, some of which may be null, into a single
399 // c-heap-allocated string.
400 char* SysClassPath::combined_path() {
401 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
402
403 size_t lengths[_scp_nitems];
404 size_t total_len = 0;
405
406 const char separator = *os::path_separator();
407
408 // Get the lengths.
409 int i;
410 for (i = 0; i < _scp_nitems; ++i) {
411 if (_items[i] != NULL) {
412 lengths[i] = strlen(_items[i]);
413 // Include space for the separator char (or a NULL for the last item).
414 total_len += lengths[i] + 1;
415 }
416 }
417 assert(total_len > 0, "empty sysclasspath not allowed");
418
419 // Copy the _items to a single string.
420 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
421 char* cp_tmp = cp;
422 for (i = 0; i < _scp_nitems; ++i) {
423 if (_items[i] != NULL) {
424 memcpy(cp_tmp, _items[i], lengths[i]);
425 cp_tmp += lengths[i];
426 *cp_tmp++ = separator;
427 }
428 }
429 *--cp_tmp = '\0'; // Replace the extra separator.
430 return cp;
431 }
432
433 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
434 char*
435 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
436 char *cp;
437
438 assert(str != NULL, "just checking");
439 if (path == NULL) {
440 size_t len = strlen(str) + 1;
441 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
442 memcpy(cp, str, len); // copy the trailing null
443 } else {
444 const char separator = *os::path_separator();
445 size_t old_len = strlen(path);
446 size_t str_len = strlen(str);
447 size_t len = old_len + str_len + 2;
448
449 if (prepend) {
450 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
451 char* cp_tmp = cp;
452 memcpy(cp_tmp, str, str_len);
453 cp_tmp += str_len;
454 *cp_tmp = separator;
455 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
456 FREE_C_HEAP_ARRAY(char, path);
457 } else {
458 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
459 char* cp_tmp = cp + old_len;
460 *cp_tmp = separator;
461 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
462 }
463 }
464 return cp;
465 }
466
467 // Scan the directory and append any jar or zip files found to path.
468 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
469 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
470 DIR* dir = os::opendir(directory);
471 if (dir == NULL) return path;
472
473 char dir_sep[2] = { '\0', '\0' };
474 size_t directory_len = strlen(directory);
475 const char fileSep = *os::file_separator();
476 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
477
478 /* Scan the directory for jars/zips, appending them to path. */
479 struct dirent *entry;
480 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
481 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
482 const char* name = entry->d_name;
483 const char* ext = name + strlen(name) - 4;
484 bool isJarOrZip = ext > name &&
485 (os::file_name_strcmp(ext, ".jar") == 0 ||
486 os::file_name_strcmp(ext, ".zip") == 0);
487 if (isJarOrZip) {
488 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
489 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
490 path = add_to_path(path, jarpath, false);
491 FREE_C_HEAP_ARRAY(char, jarpath);
492 }
493 }
494 FREE_C_HEAP_ARRAY(char, dbuf);
495 os::closedir(dir);
496 return path;
497 }
498
499 // Parses a memory size specification string.
500 static bool atomull(const char *s, julong* result) {
501 julong n = 0;
502 int args_read = 0;
503 bool is_hex = false;
504 // Skip leading 0[xX] for hexadecimal
505 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
506 s += 2;
507 is_hex = true;
508 args_read = sscanf(s, JULONG_FORMAT_X, &n);
509 } else {
510 args_read = sscanf(s, JULONG_FORMAT, &n);
511 }
512 if (args_read != 1) {
513 return false;
514 }
515 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
516 s++;
517 }
518 // 4705540: illegal if more characters are found after the first non-digit
519 if (strlen(s) > 1) {
520 return false;
521 }
522 switch (*s) {
523 case 'T': case 't':
524 *result = n * G * K;
525 // Check for overflow.
526 if (*result/((julong)G * K) != n) return false;
527 return true;
528 case 'G': case 'g':
529 *result = n * G;
530 if (*result/G != n) return false;
531 return true;
532 case 'M': case 'm':
533 *result = n * M;
534 if (*result/M != n) return false;
535 return true;
536 case 'K': case 'k':
537 *result = n * K;
538 if (*result/K != n) return false;
539 return true;
540 case '\0':
541 *result = n;
542 return true;
543 default:
544 return false;
545 }
546 }
547
548 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
549 if (size < min_size) return arg_too_small;
550 // Check that size will fit in a size_t (only relevant on 32-bit)
551 if (size > max_uintx) return arg_too_big;
552 return arg_in_range;
553 }
554
555 // Describe an argument out of range error
556 void Arguments::describe_range_error(ArgsRange errcode) {
557 switch(errcode) {
558 case arg_too_big:
559 jio_fprintf(defaultStream::error_stream(),
560 "The specified size exceeds the maximum "
561 "representable size.\n");
562 break;
563 case arg_too_small:
564 case arg_unreadable:
565 case arg_in_range:
566 // do nothing for now
567 break;
568 default:
569 ShouldNotReachHere();
570 }
571 }
572
573 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
574 return CommandLineFlags::boolAtPut(name, &value, origin);
575 }
576
577 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
578 double v;
579 if (sscanf(value, "%lf", &v) != 1) {
580 return false;
581 }
582
583 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
584 return true;
585 }
586 return false;
587 }
588
589 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
590 julong v;
591 intx intx_v;
592 bool is_neg = false;
593 // Check the sign first since atomull() parses only unsigned values.
594 if (*value == '-') {
595 if (!CommandLineFlags::intxAt(name, &intx_v)) {
596 return false;
597 }
598 value++;
599 is_neg = true;
600 }
601 if (!atomull(value, &v)) {
602 return false;
603 }
604 intx_v = (intx) v;
605 if (is_neg) {
606 intx_v = -intx_v;
607 }
608 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
609 return true;
610 }
611 uintx uintx_v = (uintx) v;
612 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
613 return true;
614 }
615 uint64_t uint64_t_v = (uint64_t) v;
616 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
617 return true;
618 }
619 size_t size_t_v = (size_t) v;
620 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
621 return true;
622 }
623 return false;
624 }
625
626 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
627 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
628 // Contract: CommandLineFlags always returns a pointer that needs freeing.
629 FREE_C_HEAP_ARRAY(char, value);
630 return true;
631 }
632
633 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
634 const char* old_value = "";
635 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
636 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
637 size_t new_len = strlen(new_value);
638 const char* value;
639 char* free_this_too = NULL;
640 if (old_len == 0) {
641 value = new_value;
642 } else if (new_len == 0) {
643 value = old_value;
644 } else {
645 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
646 // each new setting adds another LINE to the switch:
647 sprintf(buf, "%s\n%s", old_value, new_value);
648 value = buf;
649 free_this_too = buf;
650 }
651 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
652 // CommandLineFlags always returns a pointer that needs freeing.
653 FREE_C_HEAP_ARRAY(char, value);
654 if (free_this_too != NULL) {
655 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
656 FREE_C_HEAP_ARRAY(char, free_this_too);
657 }
658 return true;
659 }
660
661 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
662
663 // range of acceptable characters spelled out for portability reasons
664 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
665 #define BUFLEN 255
666 char name[BUFLEN+1];
667 char dummy;
668
669 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
670 return set_bool_flag(name, false, origin);
671 }
672 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
673 return set_bool_flag(name, true, origin);
674 }
675
676 char punct;
677 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
678 const char* value = strchr(arg, '=') + 1;
679 Flag* flag = Flag::find_flag(name, strlen(name));
680 if (flag != NULL && flag->is_ccstr()) {
681 if (flag->ccstr_accumulates()) {
682 return append_to_string_flag(name, value, origin);
683 } else {
684 if (value[0] == '\0') {
685 value = NULL;
686 }
687 return set_string_flag(name, value, origin);
688 }
689 }
690 }
691
692 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
693 const char* value = strchr(arg, '=') + 1;
694 // -XX:Foo:=xxx will reset the string flag to the given value.
695 if (value[0] == '\0') {
696 value = NULL;
697 }
698 return set_string_flag(name, value, origin);
699 }
700
701 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
702 #define SIGNED_NUMBER_RANGE "[-0123456789]"
703 #define NUMBER_RANGE "[0123456789]"
704 char value[BUFLEN + 1];
705 char value2[BUFLEN + 1];
706 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
707 // Looks like a floating-point number -- try again with more lenient format string
708 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
709 return set_fp_numeric_flag(name, value, origin);
710 }
711 }
712
713 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
714 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
715 return set_numeric_flag(name, value, origin);
716 }
717
718 return false;
719 }
720
721 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
722 assert(bldarray != NULL, "illegal argument");
723
724 if (arg == NULL) {
725 return;
726 }
727
728 int new_count = *count + 1;
729
730 // expand the array and add arg to the last element
731 if (*bldarray == NULL) {
732 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
733 } else {
734 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
735 }
736 (*bldarray)[*count] = os::strdup_check_oom(arg);
737 *count = new_count;
738 }
739
740 void Arguments::build_jvm_args(const char* arg) {
741 add_string(&_jvm_args_array, &_num_jvm_args, arg);
742 }
743
744 void Arguments::build_jvm_flags(const char* arg) {
745 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
746 }
747
748 // utility function to return a string that concatenates all
749 // strings in a given char** array
750 const char* Arguments::build_resource_string(char** args, int count) {
751 if (args == NULL || count == 0) {
752 return NULL;
753 }
754 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
755 for (int i = 1; i < count; i++) {
756 length += strlen(args[i]) + 1; // add 1 for a space
757 }
758 char* s = NEW_RESOURCE_ARRAY(char, length);
759 strcpy(s, args[0]);
760 for (int j = 1; j < count; j++) {
761 strcat(s, " ");
762 strcat(s, args[j]);
763 }
764 return (const char*) s;
765 }
766
767 void Arguments::print_on(outputStream* st) {
768 st->print_cr("VM Arguments:");
769 if (num_jvm_flags() > 0) {
770 st->print("jvm_flags: "); print_jvm_flags_on(st);
771 }
772 if (num_jvm_args() > 0) {
773 st->print("jvm_args: "); print_jvm_args_on(st);
774 }
775 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
776 if (_java_class_path != NULL) {
777 char* path = _java_class_path->value();
778 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
779 }
780 st->print_cr("Launcher Type: %s", _sun_java_launcher);
781 }
782
783 void Arguments::print_jvm_flags_on(outputStream* st) {
784 if (_num_jvm_flags > 0) {
785 for (int i=0; i < _num_jvm_flags; i++) {
786 st->print("%s ", _jvm_flags_array[i]);
787 }
788 st->cr();
789 }
790 }
791
792 void Arguments::print_jvm_args_on(outputStream* st) {
793 if (_num_jvm_args > 0) {
794 for (int i=0; i < _num_jvm_args; i++) {
795 st->print("%s ", _jvm_args_array[i]);
796 }
797 st->cr();
798 }
799 }
800
801 bool Arguments::process_argument(const char* arg,
802 jboolean ignore_unrecognized, Flag::Flags origin) {
803
804 JDK_Version since = JDK_Version();
805
806 if (parse_argument(arg, origin) || ignore_unrecognized) {
807 return true;
808 }
809
810 bool has_plus_minus = (*arg == '+' || *arg == '-');
811 const char* const argname = has_plus_minus ? arg + 1 : arg;
812 if (is_newly_obsolete(arg, &since)) {
813 char version[256];
814 since.to_string(version, sizeof(version));
815 warning("ignoring option %s; support was removed in %s", argname, version);
816 return true;
817 }
818
819 // For locked flags, report a custom error message if available.
820 // Otherwise, report the standard unrecognized VM option.
821
822 size_t arg_len;
823 const char* equal_sign = strchr(argname, '=');
824 if (equal_sign == NULL) {
825 arg_len = strlen(argname);
826 } else {
827 arg_len = equal_sign - argname;
828 }
829
830 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
831 if (found_flag != NULL) {
832 char locked_message_buf[BUFLEN];
833 found_flag->get_locked_message(locked_message_buf, BUFLEN);
834 if (strlen(locked_message_buf) == 0) {
835 if (found_flag->is_bool() && !has_plus_minus) {
836 jio_fprintf(defaultStream::error_stream(),
837 "Missing +/- setting for VM option '%s'\n", argname);
838 } else if (!found_flag->is_bool() && has_plus_minus) {
839 jio_fprintf(defaultStream::error_stream(),
840 "Unexpected +/- setting in VM option '%s'\n", argname);
841 } else {
842 jio_fprintf(defaultStream::error_stream(),
843 "Improperly specified VM option '%s'\n", argname);
844 }
845 } else {
846 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
847 }
848 } else {
849 jio_fprintf(defaultStream::error_stream(),
850 "Unrecognized VM option '%s'\n", argname);
851 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
852 if (fuzzy_matched != NULL) {
853 jio_fprintf(defaultStream::error_stream(),
854 "Did you mean '%s%s%s'? ",
855 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
856 fuzzy_matched->_name,
857 (fuzzy_matched->is_bool()) ? "" : "=<value>");
858 if (is_newly_obsolete(fuzzy_matched->_name, &since)) {
859 char version[256];
860 since.to_string(version, sizeof(version));
861 jio_fprintf(defaultStream::error_stream(),
862 "Warning: support for %s was removed in %s\n",
863 fuzzy_matched->_name,
864 version);
865 }
866 }
867 }
868
869 // allow for commandline "commenting out" options like -XX:#+Verbose
870 return arg[0] == '#';
871 }
872
873 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
874 FILE* stream = fopen(file_name, "rb");
875 if (stream == NULL) {
876 if (should_exist) {
877 jio_fprintf(defaultStream::error_stream(),
878 "Could not open settings file %s\n", file_name);
879 return false;
880 } else {
881 return true;
882 }
883 }
884
885 char token[1024];
886 int pos = 0;
887
888 bool in_white_space = true;
889 bool in_comment = false;
890 bool in_quote = false;
891 char quote_c = 0;
892 bool result = true;
893
894 int c = getc(stream);
895 while(c != EOF && pos < (int)(sizeof(token)-1)) {
896 if (in_white_space) {
897 if (in_comment) {
898 if (c == '\n') in_comment = false;
899 } else {
900 if (c == '#') in_comment = true;
901 else if (!isspace(c)) {
902 in_white_space = false;
903 token[pos++] = c;
904 }
905 }
906 } else {
907 if (c == '\n' || (!in_quote && isspace(c))) {
908 // token ends at newline, or at unquoted whitespace
909 // this allows a way to include spaces in string-valued options
910 token[pos] = '\0';
911 logOption(token);
912 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
913 build_jvm_flags(token);
914 pos = 0;
915 in_white_space = true;
916 in_quote = false;
917 } else if (!in_quote && (c == '\'' || c == '"')) {
918 in_quote = true;
919 quote_c = c;
920 } else if (in_quote && (c == quote_c)) {
921 in_quote = false;
922 } else {
923 token[pos++] = c;
924 }
925 }
926 c = getc(stream);
927 }
928 if (pos > 0) {
929 token[pos] = '\0';
930 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
931 build_jvm_flags(token);
932 }
933 fclose(stream);
934 return result;
935 }
936
937 //=============================================================================================================
938 // Parsing of properties (-D)
939
940 const char* Arguments::get_property(const char* key) {
941 return PropertyList_get_value(system_properties(), key);
942 }
943
944 bool Arguments::add_property(const char* prop) {
945 const char* eq = strchr(prop, '=');
946 char* key;
947 // ns must be static--its address may be stored in a SystemProperty object.
948 const static char ns[1] = {0};
949 char* value = (char *)ns;
950
951 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
952 key = AllocateHeap(key_len + 1, mtInternal);
953 strncpy(key, prop, key_len);
954 key[key_len] = '\0';
955
956 if (eq != NULL) {
957 size_t value_len = strlen(prop) - key_len - 1;
958 value = AllocateHeap(value_len + 1, mtInternal);
959 strncpy(value, &prop[key_len + 1], value_len + 1);
960 }
961
962 if (strcmp(key, "java.compiler") == 0) {
963 process_java_compiler_argument(value);
964 FreeHeap(key);
965 if (eq != NULL) {
966 FreeHeap(value);
967 }
968 return true;
969 } else if (strcmp(key, "sun.java.command") == 0) {
970 _java_command = value;
971
972 // Record value in Arguments, but let it get passed to Java.
973 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
974 strcmp(key, "sun.java.launcher.pid") == 0) {
975 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
976 // private and are processed in process_sun_java_launcher_properties();
977 // the sun.java.launcher property is passed on to the java application
978 FreeHeap(key);
979 if (eq != NULL) {
980 FreeHeap(value);
981 }
982 return true;
983 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
984 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
985 // its value without going through the property list or making a Java call.
986 _java_vendor_url_bug = value;
987 } else if (strcmp(key, "sun.boot.library.path") == 0) {
988 PropertyList_unique_add(&_system_properties, key, value, true);
989 return true;
990 }
991 // Create new property and add at the end of the list
992 PropertyList_unique_add(&_system_properties, key, value);
993 return true;
994 }
995
996 //===========================================================================================================
997 // Setting int/mixed/comp mode flags
998
999 void Arguments::set_mode_flags(Mode mode) {
1000 // Set up default values for all flags.
1001 // If you add a flag to any of the branches below,
1002 // add a default value for it here.
1003 set_java_compiler(false);
1004 _mode = mode;
1005
1006 // Ensure Agent_OnLoad has the correct initial values.
1007 // This may not be the final mode; mode may change later in onload phase.
1008 PropertyList_unique_add(&_system_properties, "java.vm.info",
1009 (char*)VM_Version::vm_info_string(), false);
1010
1011 UseInterpreter = true;
1012 UseCompiler = true;
1013 UseLoopCounter = true;
1014
1015 // Default values may be platform/compiler dependent -
1016 // use the saved values
1017 ClipInlining = Arguments::_ClipInlining;
1018 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1019 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1020 BackgroundCompilation = Arguments::_BackgroundCompilation;
1021
1022 // Change from defaults based on mode
1023 switch (mode) {
1024 default:
1025 ShouldNotReachHere();
1026 break;
1027 case _int:
1028 UseCompiler = false;
1029 UseLoopCounter = false;
1030 AlwaysCompileLoopMethods = false;
1031 UseOnStackReplacement = false;
1032 break;
1033 case _mixed:
1034 // same as default
1035 break;
1036 case _comp:
1037 UseInterpreter = false;
1038 BackgroundCompilation = false;
1039 ClipInlining = false;
1040 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1041 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1042 // compile a level 4 (C2) and then continue executing it.
1043 if (TieredCompilation) {
1044 Tier3InvokeNotifyFreqLog = 0;
1045 Tier4InvocationThreshold = 0;
1046 }
1047 break;
1048 }
1049 }
1050
1051 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1052 // Conflict: required to use shared spaces (-Xshare:on), but
1053 // incompatible command line options were chosen.
1054
1055 static void no_shared_spaces(const char* message) {
1056 if (RequireSharedSpaces) {
1057 jio_fprintf(defaultStream::error_stream(),
1058 "Class data sharing is inconsistent with other specified options.\n");
1059 vm_exit_during_initialization("Unable to use shared archive.", message);
1060 } else {
1061 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1062 }
1063 }
1064 #endif
1065
1066 // Returns threshold scaled with the value of scale.
1067 // If scale < 0.0, threshold is returned without scaling.
1068 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1069 if (scale == 1.0 || scale < 0.0) {
1070 return threshold;
1071 } else {
1072 return (intx)(threshold * scale);
1073 }
1074 }
1075
1076 // Returns freq_log scaled with the value of scale.
1077 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1078 // If scale < 0.0, freq_log is returned without scaling.
1079 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1080 // Check if scaling is necessary or if negative value was specified.
1081 if (scale == 1.0 || scale < 0.0) {
1082 return freq_log;
1083 }
1084 // Check values to avoid calculating log2 of 0.
1085 if (scale == 0.0 || freq_log == 0) {
1086 return 0;
1087 }
1088 // Determine the maximum notification frequency value currently supported.
1089 // The largest mask value that the interpreter/C1 can handle is
1090 // of length InvocationCounter::number_of_count_bits. Mask values are always
1091 // one bit shorter then the value of the notification frequency. Set
1092 // max_freq_bits accordingly.
1093 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1094 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1095 if (scaled_freq == 0) {
1096 // Return 0 right away to avoid calculating log2 of 0.
1097 return 0;
1098 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1099 return max_freq_bits;
1100 } else {
1101 return log2_intptr(scaled_freq);
1102 }
1103 }
1104
1105 void Arguments::set_tiered_flags() {
1106 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1107 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1108 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1109 }
1110 if (CompilationPolicyChoice < 2) {
1111 vm_exit_during_initialization(
1112 "Incompatible compilation policy selected", NULL);
1113 }
1114 // Increase the code cache size - tiered compiles a lot more.
1115 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1116 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1117 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1118 }
1119 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1120 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1121 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1122
1123 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1124 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1125 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1126 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1127 }
1128 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1129 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1130 }
1131 // Check consistency of code heap sizes
1132 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1133 jio_fprintf(defaultStream::error_stream(),
1134 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1135 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1136 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1137 vm_exit(1);
1138 }
1139 }
1140 }
1141 if (!UseInterpreter) { // -Xcomp
1142 Tier3InvokeNotifyFreqLog = 0;
1143 Tier4InvocationThreshold = 0;
1144 }
1145
1146 if (CompileThresholdScaling < 0) {
1147 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1148 }
1149
1150 // Scale tiered compilation thresholds.
1151 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1152 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1153 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1154 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1155
1156 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1157 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1158 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1159 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1160
1161 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1162 // once these thresholds become supported.
1163
1164 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1165 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1166
1167 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1168 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1169
1170 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1171
1172 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1173 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1174 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1175 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1176 }
1177 }
1178
1179 /**
1180 * Returns the minimum number of compiler threads needed to run the JVM. The following
1181 * configurations are possible.
1182 *
1183 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1184 * compiler threads is 0.
1185 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1186 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1187 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1188 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1189 * C1 can be used, so the minimum number of compiler threads is 1.
1190 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1191 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1192 * the minimum number of compiler threads is 2.
1193 */
1194 int Arguments::get_min_number_of_compiler_threads() {
1195 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1196 return 0; // case 1
1197 #else
1198 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1199 return 1; // case 2 or case 3
1200 }
1201 return 2; // case 4 (tiered)
1202 #endif
1203 }
1204
1205 #if INCLUDE_ALL_GCS
1206 static void disable_adaptive_size_policy(const char* collector_name) {
1207 if (UseAdaptiveSizePolicy) {
1208 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1209 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1210 collector_name);
1211 }
1212 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1213 }
1214 }
1215
1216 void Arguments::set_parnew_gc_flags() {
1217 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1218 "control point invariant");
1219 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1220 assert(UseParNewGC, "ParNew should always be used with CMS");
1221
1222 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1223 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1224 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1225 } else if (ParallelGCThreads == 0) {
1226 jio_fprintf(defaultStream::error_stream(),
1227 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1228 vm_exit(1);
1229 }
1230
1231 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1232 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1233 // we set them to 1024 and 1024.
1234 // See CR 6362902.
1235 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1236 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1237 }
1238 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1239 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1240 }
1241
1242 // When using compressed oops, we use local overflow stacks,
1243 // rather than using a global overflow list chained through
1244 // the klass word of the object's pre-image.
1245 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1246 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1247 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1248 }
1249 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1250 }
1251 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1252 }
1253
1254 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1255 // sparc/solaris for certain applications, but would gain from
1256 // further optimization and tuning efforts, and would almost
1257 // certainly gain from analysis of platform and environment.
1258 void Arguments::set_cms_and_parnew_gc_flags() {
1259 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1260 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1261 assert(UseParNewGC, "ParNew should always be used with CMS");
1262
1263 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1264 disable_adaptive_size_policy("UseConcMarkSweepGC");
1265
1266 set_parnew_gc_flags();
1267
1268 size_t max_heap = align_size_down(MaxHeapSize,
1269 CardTableRS::ct_max_alignment_constraint());
1270
1271 // Now make adjustments for CMS
1272 intx tenuring_default = (intx)6;
1273 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1274
1275 // Preferred young gen size for "short" pauses:
1276 // upper bound depends on # of threads and NewRatio.
1277 const uintx parallel_gc_threads =
1278 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1279 const size_t preferred_max_new_size_unaligned =
1280 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1281 size_t preferred_max_new_size =
1282 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1283
1284 // Unless explicitly requested otherwise, size young gen
1285 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1286
1287 // If either MaxNewSize or NewRatio is set on the command line,
1288 // assume the user is trying to set the size of the young gen.
1289 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1290
1291 // Set MaxNewSize to our calculated preferred_max_new_size unless
1292 // NewSize was set on the command line and it is larger than
1293 // preferred_max_new_size.
1294 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1295 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1296 } else {
1297 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1298 }
1299 if (PrintGCDetails && Verbose) {
1300 // Too early to use gclog_or_tty
1301 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1302 }
1303
1304 // Code along this path potentially sets NewSize and OldSize
1305 if (PrintGCDetails && Verbose) {
1306 // Too early to use gclog_or_tty
1307 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1308 " initial_heap_size: " SIZE_FORMAT
1309 " max_heap: " SIZE_FORMAT,
1310 min_heap_size(), InitialHeapSize, max_heap);
1311 }
1312 size_t min_new = preferred_max_new_size;
1313 if (FLAG_IS_CMDLINE(NewSize)) {
1314 min_new = NewSize;
1315 }
1316 if (max_heap > min_new && min_heap_size() > min_new) {
1317 // Unless explicitly requested otherwise, make young gen
1318 // at least min_new, and at most preferred_max_new_size.
1319 if (FLAG_IS_DEFAULT(NewSize)) {
1320 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1321 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1322 if (PrintGCDetails && Verbose) {
1323 // Too early to use gclog_or_tty
1324 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1325 }
1326 }
1327 // Unless explicitly requested otherwise, size old gen
1328 // so it's NewRatio x of NewSize.
1329 if (FLAG_IS_DEFAULT(OldSize)) {
1330 if (max_heap > NewSize) {
1331 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1332 if (PrintGCDetails && Verbose) {
1333 // Too early to use gclog_or_tty
1334 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1335 }
1336 }
1337 }
1338 }
1339 }
1340 // Unless explicitly requested otherwise, definitely
1341 // promote all objects surviving "tenuring_default" scavenges.
1342 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1343 FLAG_IS_DEFAULT(SurvivorRatio)) {
1344 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1345 }
1346 // If we decided above (or user explicitly requested)
1347 // `promote all' (via MaxTenuringThreshold := 0),
1348 // prefer minuscule survivor spaces so as not to waste
1349 // space for (non-existent) survivors
1350 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1351 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1352 }
1353
1354 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1355 // but rather the number of free blocks of a given size that are used when
1356 // replenishing the local per-worker free list caches.
1357 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1358 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1359 // OldPLAB sizing manually turned off: Use a larger default setting,
1360 // unless it was manually specified. This is because a too-low value
1361 // will slow down scavenges.
1362 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1363 } else {
1364 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1365 }
1366 }
1367
1368 // If either of the static initialization defaults have changed, note this
1369 // modification.
1370 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1371 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1372 }
1373 if (PrintGCDetails && Verbose) {
1374 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1375 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1376 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1377 }
1378 }
1379 #endif // INCLUDE_ALL_GCS
1380
1381 void set_object_alignment() {
1382 // Object alignment.
1383 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1384 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1385 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1386 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1387 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1388 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1389
1390 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1391 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1392
1393 // Oop encoding heap max
1394 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1395
1396 #if INCLUDE_ALL_GCS
1397 // Set CMS global values
1398 CompactibleFreeListSpace::set_cms_values();
1399 #endif // INCLUDE_ALL_GCS
1400 }
1401
1402 bool verify_object_alignment() {
1403 // Object alignment.
1404 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1405 jio_fprintf(defaultStream::error_stream(),
1406 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1407 (int)ObjectAlignmentInBytes);
1408 return false;
1409 }
1410 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1411 jio_fprintf(defaultStream::error_stream(),
1412 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1413 (int)ObjectAlignmentInBytes, BytesPerLong);
1414 return false;
1415 }
1416 // It does not make sense to have big object alignment
1417 // since a space lost due to alignment will be greater
1418 // then a saved space from compressed oops.
1419 if ((int)ObjectAlignmentInBytes > 256) {
1420 jio_fprintf(defaultStream::error_stream(),
1421 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1422 (int)ObjectAlignmentInBytes);
1423 return false;
1424 }
1425 // In case page size is very small.
1426 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1427 jio_fprintf(defaultStream::error_stream(),
1428 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1429 (int)ObjectAlignmentInBytes, os::vm_page_size());
1430 return false;
1431 }
1432 if(SurvivorAlignmentInBytes == 0) {
1433 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1434 } else {
1435 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1436 jio_fprintf(defaultStream::error_stream(),
1437 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1438 (int)SurvivorAlignmentInBytes);
1439 return false;
1440 }
1441 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1442 jio_fprintf(defaultStream::error_stream(),
1443 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1444 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1445 return false;
1446 }
1447 }
1448 return true;
1449 }
1450
1451 size_t Arguments::max_heap_for_compressed_oops() {
1452 // Avoid sign flip.
1453 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1454 // We need to fit both the NULL page and the heap into the memory budget, while
1455 // keeping alignment constraints of the heap. To guarantee the latter, as the
1456 // NULL page is located before the heap, we pad the NULL page to the conservative
1457 // maximum alignment that the GC may ever impose upon the heap.
1458 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1459 _conservative_max_heap_alignment);
1460
1461 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1462 NOT_LP64(ShouldNotReachHere(); return 0);
1463 }
1464
1465 bool Arguments::should_auto_select_low_pause_collector() {
1466 if (UseAutoGCSelectPolicy &&
1467 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1468 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1469 if (PrintGCDetails) {
1470 // Cannot use gclog_or_tty yet.
1471 tty->print_cr("Automatic selection of the low pause collector"
1472 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1473 }
1474 return true;
1475 }
1476 return false;
1477 }
1478
1479 void Arguments::set_use_compressed_oops() {
1480 #ifndef ZERO
1481 #ifdef _LP64
1482 // MaxHeapSize is not set up properly at this point, but
1483 // the only value that can override MaxHeapSize if we are
1484 // to use UseCompressedOops is InitialHeapSize.
1485 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1486
1487 if (max_heap_size <= max_heap_for_compressed_oops()) {
1488 #if !defined(COMPILER1) || defined(TIERED)
1489 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1490 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1491 }
1492 #endif
1493 } else {
1494 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1495 warning("Max heap size too large for Compressed Oops");
1496 FLAG_SET_DEFAULT(UseCompressedOops, false);
1497 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1498 }
1499 }
1500 #endif // _LP64
1501 #endif // ZERO
1502 }
1503
1504
1505 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1506 // set_use_compressed_oops().
1507 void Arguments::set_use_compressed_klass_ptrs() {
1508 #ifndef ZERO
1509 #ifdef _LP64
1510 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1511 if (!UseCompressedOops) {
1512 if (UseCompressedClassPointers) {
1513 warning("UseCompressedClassPointers requires UseCompressedOops");
1514 }
1515 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1516 } else {
1517 // Turn on UseCompressedClassPointers too
1518 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1519 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1520 }
1521 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1522 if (UseCompressedClassPointers) {
1523 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1524 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1525 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1526 }
1527 }
1528 }
1529 #endif // _LP64
1530 #endif // !ZERO
1531 }
1532
1533 void Arguments::set_conservative_max_heap_alignment() {
1534 // The conservative maximum required alignment for the heap is the maximum of
1535 // the alignments imposed by several sources: any requirements from the heap
1536 // itself, the collector policy and the maximum page size we may run the VM
1537 // with.
1538 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1539 #if INCLUDE_ALL_GCS
1540 if (UseParallelGC) {
1541 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1542 } else if (UseG1GC) {
1543 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1544 }
1545 #endif // INCLUDE_ALL_GCS
1546 _conservative_max_heap_alignment = MAX4(heap_alignment,
1547 (size_t)os::vm_allocation_granularity(),
1548 os::max_page_size(),
1549 CollectorPolicy::compute_heap_alignment());
1550 }
1551
1552 void Arguments::select_gc_ergonomically() {
1553 if (os::is_server_class_machine()) {
1554 if (should_auto_select_low_pause_collector()) {
1555 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1556 } else {
1557 FLAG_SET_ERGO(bool, UseParallelGC, true);
1558 }
1559 }
1560 }
1561
1562 void Arguments::select_gc() {
1563 if (!gc_selected()) {
1564 select_gc_ergonomically();
1565 }
1566 }
1567
1568 void Arguments::set_ergonomics_flags() {
1569 select_gc();
1570
1571 #ifdef COMPILER2
1572 // Shared spaces work fine with other GCs but causes bytecode rewriting
1573 // to be disabled, which hurts interpreter performance and decreases
1574 // server performance. When -server is specified, keep the default off
1575 // unless it is asked for. Future work: either add bytecode rewriting
1576 // at link time, or rewrite bytecodes in non-shared methods.
1577 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1578 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1579 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1580 }
1581 #endif
1582
1583 set_conservative_max_heap_alignment();
1584
1585 #ifndef ZERO
1586 #ifdef _LP64
1587 set_use_compressed_oops();
1588
1589 // set_use_compressed_klass_ptrs() must be called after calling
1590 // set_use_compressed_oops().
1591 set_use_compressed_klass_ptrs();
1592
1593 // Also checks that certain machines are slower with compressed oops
1594 // in vm_version initialization code.
1595 #endif // _LP64
1596 #endif // !ZERO
1597 }
1598
1599 void Arguments::set_parallel_gc_flags() {
1600 assert(UseParallelGC || UseParallelOldGC, "Error");
1601 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1602 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1603 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1604 }
1605 FLAG_SET_DEFAULT(UseParallelGC, true);
1606
1607 // If no heap maximum was requested explicitly, use some reasonable fraction
1608 // of the physical memory, up to a maximum of 1GB.
1609 FLAG_SET_DEFAULT(ParallelGCThreads,
1610 Abstract_VM_Version::parallel_worker_threads());
1611 if (ParallelGCThreads == 0) {
1612 jio_fprintf(defaultStream::error_stream(),
1613 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1614 vm_exit(1);
1615 }
1616
1617 if (UseAdaptiveSizePolicy) {
1618 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1619 // unless the user actually sets these flags.
1620 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1621 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1622 _min_heap_free_ratio = MinHeapFreeRatio;
1623 }
1624 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1625 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1626 _max_heap_free_ratio = MaxHeapFreeRatio;
1627 }
1628 }
1629
1630 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1631 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1632 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1633 // See CR 6362902 for details.
1634 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1635 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1636 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1637 }
1638 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1639 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1640 }
1641 }
1642
1643 if (UseParallelOldGC) {
1644 // Par compact uses lower default values since they are treated as
1645 // minimums. These are different defaults because of the different
1646 // interpretation and are not ergonomically set.
1647 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1648 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1649 }
1650 }
1651 }
1652
1653 void Arguments::set_g1_gc_flags() {
1654 assert(UseG1GC, "Error");
1655 #ifdef COMPILER1
1656 FastTLABRefill = false;
1657 #endif
1658 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1659 if (ParallelGCThreads == 0) {
1660 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1661 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1662 }
1663
1664 #if INCLUDE_ALL_GCS
1665 if (G1ConcRefinementThreads == 0) {
1666 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1667 }
1668 #endif
1669
1670 // MarkStackSize will be set (if it hasn't been set by the user)
1671 // when concurrent marking is initialized.
1672 // Its value will be based upon the number of parallel marking threads.
1673 // But we do set the maximum mark stack size here.
1674 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1675 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1676 }
1677
1678 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1679 // In G1, we want the default GC overhead goal to be higher than
1680 // say in PS. So we set it here to 10%. Otherwise the heap might
1681 // be expanded more aggressively than we would like it to. In
1682 // fact, even 10% seems to not be high enough in some cases
1683 // (especially small GC stress tests that the main thing they do
1684 // is allocation). We might consider increase it further.
1685 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1686 }
1687
1688 if (PrintGCDetails && Verbose) {
1689 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1690 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1691 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1692 }
1693 }
1694
1695 #if !INCLUDE_ALL_GCS
1696 #ifdef ASSERT
1697 static bool verify_serial_gc_flags() {
1698 return (UseSerialGC &&
1699 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1700 UseParallelGC || UseParallelOldGC));
1701 }
1702 #endif // ASSERT
1703 #endif // INCLUDE_ALL_GCS
1704
1705 void Arguments::set_gc_specific_flags() {
1706 #if INCLUDE_ALL_GCS
1707 // Set per-collector flags
1708 if (UseParallelGC || UseParallelOldGC) {
1709 set_parallel_gc_flags();
1710 } else if (UseConcMarkSweepGC) {
1711 set_cms_and_parnew_gc_flags();
1712 } else if (UseG1GC) {
1713 set_g1_gc_flags();
1714 }
1715 check_deprecated_gc_flags();
1716 if (AssumeMP && !UseSerialGC) {
1717 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1718 warning("If the number of processors is expected to increase from one, then"
1719 " you should configure the number of parallel GC threads appropriately"
1720 " using -XX:ParallelGCThreads=N");
1721 }
1722 }
1723 if (MinHeapFreeRatio == 100) {
1724 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1725 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1726 }
1727 #else // INCLUDE_ALL_GCS
1728 assert(verify_serial_gc_flags(), "SerialGC unset");
1729 #endif // INCLUDE_ALL_GCS
1730 }
1731
1732 julong Arguments::limit_by_allocatable_memory(julong limit) {
1733 julong max_allocatable;
1734 julong result = limit;
1735 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1736 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1737 }
1738 return result;
1739 }
1740
1741 // Use static initialization to get the default before parsing
1742 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1743
1744 void Arguments::set_heap_size() {
1745 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1746 // Deprecated flag
1747 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1748 }
1749
1750 const julong phys_mem =
1751 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1752 : (julong)MaxRAM;
1753
1754 // If the maximum heap size has not been set with -Xmx,
1755 // then set it as fraction of the size of physical memory,
1756 // respecting the maximum and minimum sizes of the heap.
1757 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1758 julong reasonable_max = phys_mem / MaxRAMFraction;
1759
1760 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1761 // Small physical memory, so use a minimum fraction of it for the heap
1762 reasonable_max = phys_mem / MinRAMFraction;
1763 } else {
1764 // Not-small physical memory, so require a heap at least
1765 // as large as MaxHeapSize
1766 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1767 }
1768 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1769 // Limit the heap size to ErgoHeapSizeLimit
1770 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1771 }
1772 if (UseCompressedOops) {
1773 // Limit the heap size to the maximum possible when using compressed oops
1774 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1775
1776 // HeapBaseMinAddress can be greater than default but not less than.
1777 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1778 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1779 // matches compressed oops printing flags
1780 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1781 jio_fprintf(defaultStream::error_stream(),
1782 "HeapBaseMinAddress must be at least " SIZE_FORMAT
1783 " (" SIZE_FORMAT "G) which is greater than value given "
1784 SIZE_FORMAT "\n",
1785 DefaultHeapBaseMinAddress,
1786 DefaultHeapBaseMinAddress/G,
1787 HeapBaseMinAddress);
1788 }
1789 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1790 }
1791 }
1792
1793 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1794 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1795 // but it should be not less than default MaxHeapSize.
1796 max_coop_heap -= HeapBaseMinAddress;
1797 }
1798 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1799 }
1800 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1801
1802 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1803 // An initial heap size was specified on the command line,
1804 // so be sure that the maximum size is consistent. Done
1805 // after call to limit_by_allocatable_memory because that
1806 // method might reduce the allocation size.
1807 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1808 }
1809
1810 if (PrintGCDetails && Verbose) {
1811 // Cannot use gclog_or_tty yet.
1812 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1813 }
1814 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1815 }
1816
1817 // If the minimum or initial heap_size have not been set or requested to be set
1818 // ergonomically, set them accordingly.
1819 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1820 julong reasonable_minimum = (julong)(OldSize + NewSize);
1821
1822 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1823
1824 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1825
1826 if (InitialHeapSize == 0) {
1827 julong reasonable_initial = phys_mem / InitialRAMFraction;
1828
1829 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1830 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1831
1832 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1833
1834 if (PrintGCDetails && Verbose) {
1835 // Cannot use gclog_or_tty yet.
1836 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1837 }
1838 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1839 }
1840 // If the minimum heap size has not been set (via -Xms),
1841 // synchronize with InitialHeapSize to avoid errors with the default value.
1842 if (min_heap_size() == 0) {
1843 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1844 if (PrintGCDetails && Verbose) {
1845 // Cannot use gclog_or_tty yet.
1846 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1847 }
1848 }
1849 }
1850 }
1851
1852 // This must be called after ergonomics.
1853 void Arguments::set_bytecode_flags() {
1854 if (!RewriteBytecodes) {
1855 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1856 }
1857 }
1858
1859 // Aggressive optimization flags -XX:+AggressiveOpts
1860 void Arguments::set_aggressive_opts_flags() {
1861 #ifdef COMPILER2
1862 if (AggressiveUnboxing) {
1863 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1864 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1865 } else if (!EliminateAutoBox) {
1866 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1867 AggressiveUnboxing = false;
1868 }
1869 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1870 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1871 } else if (!DoEscapeAnalysis) {
1872 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1873 AggressiveUnboxing = false;
1874 }
1875 }
1876 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1877 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1878 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1879 }
1880 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1881 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1882 }
1883
1884 // Feed the cache size setting into the JDK
1885 char buffer[1024];
1886 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1887 add_property(buffer);
1888 }
1889 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1890 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1891 }
1892 #endif
1893
1894 if (AggressiveOpts) {
1895 // Sample flag setting code
1896 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1897 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1898 // }
1899 }
1900 }
1901
1902 //===========================================================================================================
1903 // Parsing of java.compiler property
1904
1905 void Arguments::process_java_compiler_argument(char* arg) {
1906 // For backwards compatibility, Djava.compiler=NONE or ""
1907 // causes us to switch to -Xint mode UNLESS -Xdebug
1908 // is also specified.
1909 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1910 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1911 }
1912 }
1913
1914 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1915 _sun_java_launcher = os::strdup_check_oom(launcher);
1916 }
1917
1918 bool Arguments::created_by_java_launcher() {
1919 assert(_sun_java_launcher != NULL, "property must have value");
1920 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1921 }
1922
1923 bool Arguments::sun_java_launcher_is_altjvm() {
1924 return _sun_java_launcher_is_altjvm;
1925 }
1926
1927 //===========================================================================================================
1928 // Parsing of main arguments
1929
1930 bool Arguments::verify_interval(uintx val, uintx min,
1931 uintx max, const char* name) {
1932 // Returns true iff value is in the inclusive interval [min..max]
1933 // false, otherwise.
1934 if (val >= min && val <= max) {
1935 return true;
1936 }
1937 jio_fprintf(defaultStream::error_stream(),
1938 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1939 " and " UINTX_FORMAT "\n",
1940 name, val, min, max);
1941 return false;
1942 }
1943
1944 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1945 // Returns true if given value is at least specified min threshold
1946 // false, otherwise.
1947 if (val >= min ) {
1948 return true;
1949 }
1950 jio_fprintf(defaultStream::error_stream(),
1951 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1952 name, val, min);
1953 return false;
1954 }
1955
1956 bool Arguments::verify_percentage(uintx value, const char* name) {
1957 if (is_percentage(value)) {
1958 return true;
1959 }
1960 jio_fprintf(defaultStream::error_stream(),
1961 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1962 name, value);
1963 return false;
1964 }
1965
1966 // check if do gclog rotation
1967 // +UseGCLogFileRotation is a must,
1968 // no gc log rotation when log file not supplied or
1969 // NumberOfGCLogFiles is 0
1970 void check_gclog_consistency() {
1971 if (UseGCLogFileRotation) {
1972 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1973 jio_fprintf(defaultStream::output_stream(),
1974 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1975 "where num_of_file > 0\n"
1976 "GC log rotation is turned off\n");
1977 UseGCLogFileRotation = false;
1978 }
1979 }
1980
1981 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1982 FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K);
1983 jio_fprintf(defaultStream::output_stream(),
1984 "GCLogFileSize changed to minimum 8K\n");
1985 }
1986 }
1987
1988 // This function is called for -Xloggc:<filename>, it can be used
1989 // to check if a given file name(or string) conforms to the following
1990 // specification:
1991 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1992 // %p and %t only allowed once. We only limit usage of filename not path
1993 bool is_filename_valid(const char *file_name) {
1994 const char* p = file_name;
1995 char file_sep = os::file_separator()[0];
1996 const char* cp;
1997 // skip prefix path
1998 for (cp = file_name; *cp != '\0'; cp++) {
1999 if (*cp == '/' || *cp == file_sep) {
2000 p = cp + 1;
2001 }
2002 }
2003
2004 int count_p = 0;
2005 int count_t = 0;
2006 while (*p != '\0') {
2007 if ((*p >= '0' && *p <= '9') ||
2008 (*p >= 'A' && *p <= 'Z') ||
2009 (*p >= 'a' && *p <= 'z') ||
2010 *p == '-' ||
2011 *p == '_' ||
2012 *p == '.') {
2013 p++;
2014 continue;
2015 }
2016 if (*p == '%') {
2017 if(*(p + 1) == 'p') {
2018 p += 2;
2019 count_p ++;
2020 continue;
2021 }
2022 if (*(p + 1) == 't') {
2023 p += 2;
2024 count_t ++;
2025 continue;
2026 }
2027 }
2028 return false;
2029 }
2030 return count_p < 2 && count_t < 2;
2031 }
2032
2033 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2034 if (!is_percentage(min_heap_free_ratio)) {
2035 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2036 return false;
2037 }
2038 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2039 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2040 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2041 MaxHeapFreeRatio);
2042 return false;
2043 }
2044 // This does not set the flag itself, but stores the value in a safe place for later usage.
2045 _min_heap_free_ratio = min_heap_free_ratio;
2046 return true;
2047 }
2048
2049 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2050 if (!is_percentage(max_heap_free_ratio)) {
2051 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2052 return false;
2053 }
2054 if (max_heap_free_ratio < MinHeapFreeRatio) {
2055 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2056 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2057 MinHeapFreeRatio);
2058 return false;
2059 }
2060 // This does not set the flag itself, but stores the value in a safe place for later usage.
2061 _max_heap_free_ratio = max_heap_free_ratio;
2062 return true;
2063 }
2064
2065 // Check consistency of GC selection
2066 bool Arguments::check_gc_consistency() {
2067 check_gclog_consistency();
2068 // Ensure that the user has not selected conflicting sets
2069 // of collectors.
2070 uint i = 0;
2071 if (UseSerialGC) i++;
2072 if (UseConcMarkSweepGC) i++;
2073 if (UseParallelGC || UseParallelOldGC) i++;
2074 if (UseG1GC) i++;
2075 if (i > 1) {
2076 jio_fprintf(defaultStream::error_stream(),
2077 "Conflicting collector combinations in option list; "
2078 "please refer to the release notes for the combinations "
2079 "allowed\n");
2080 return false;
2081 }
2082
2083 if (UseConcMarkSweepGC && !UseParNewGC) {
2084 jio_fprintf(defaultStream::error_stream(),
2085 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2086 return false;
2087 }
2088
2089 if (UseParNewGC && !UseConcMarkSweepGC) {
2090 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2091 // set up UseSerialGC properly, so that can't be used in the check here.
2092 jio_fprintf(defaultStream::error_stream(),
2093 "It is not possible to combine the ParNew young collector with the Serial old collector.\n");
2094 return false;
2095 }
2096
2097 return true;
2098 }
2099
2100 void Arguments::check_deprecated_gc_flags() {
2101 if (FLAG_IS_CMDLINE(UseParNewGC)) {
2102 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2103 }
2104 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2105 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2106 "and will likely be removed in future release");
2107 }
2108 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2109 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2110 "Use MaxRAMFraction instead.");
2111 }
2112 }
2113
2114 // Check stack pages settings
2115 bool Arguments::check_stack_pages()
2116 {
2117 bool status = true;
2118 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2119 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2120 // greater stack shadow pages can't generate instruction to bang stack
2121 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2122 return status;
2123 }
2124
2125 // Check the consistency of vm_init_args
2126 bool Arguments::check_vm_args_consistency() {
2127 // Method for adding checks for flag consistency.
2128 // The intent is to warn the user of all possible conflicts,
2129 // before returning an error.
2130 // Note: Needs platform-dependent factoring.
2131 bool status = true;
2132
2133 if (TLABRefillWasteFraction == 0) {
2134 jio_fprintf(defaultStream::error_stream(),
2135 "TLABRefillWasteFraction should be a denominator, "
2136 "not " SIZE_FORMAT "\n",
2137 TLABRefillWasteFraction);
2138 status = false;
2139 }
2140
2141 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2142 "AdaptiveSizePolicyWeight");
2143 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2144
2145 // Divide by bucket size to prevent a large size from causing rollover when
2146 // calculating amount of memory needed to be allocated for the String table.
2147 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2148 (max_uintx / StringTable::bucket_size()), "StringTable size");
2149
2150 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2151 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2152
2153 {
2154 // Using "else if" below to avoid printing two error messages if min > max.
2155 // This will also prevent us from reporting both min>100 and max>100 at the
2156 // same time, but that is less annoying than printing two identical errors IMHO.
2157 FormatBuffer<80> err_msg("%s","");
2158 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2159 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2160 status = false;
2161 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2162 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2163 status = false;
2164 }
2165 }
2166
2167 // Min/MaxMetaspaceFreeRatio
2168 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2169 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2170
2171 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2172 jio_fprintf(defaultStream::error_stream(),
2173 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2174 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2175 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2176 MinMetaspaceFreeRatio,
2177 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2178 MaxMetaspaceFreeRatio);
2179 status = false;
2180 }
2181
2182 // Trying to keep 100% free is not practical
2183 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2184
2185 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2186 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2187 }
2188
2189 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2190 // Settings to encourage splitting.
2191 if (!FLAG_IS_CMDLINE(NewRatio)) {
2192 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2193 }
2194 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2195 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2196 }
2197 }
2198
2199 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2200 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2201 }
2202
2203 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2204 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2205 if (GCTimeLimit == 100) {
2206 // Turn off gc-overhead-limit-exceeded checks
2207 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2208 }
2209
2210 status = status && check_gc_consistency();
2211 status = status && check_stack_pages();
2212
2213 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2214 "CMSIncrementalSafetyFactor");
2215
2216 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2217 // insists that we hold the requisite locks so that the iteration is
2218 // MT-safe. For the verification at start-up and shut-down, we don't
2219 // yet have a good way of acquiring and releasing these locks,
2220 // which are not visible at the CollectedHeap level. We want to
2221 // be able to acquire these locks and then do the iteration rather
2222 // than just disable the lock verification. This will be fixed under
2223 // bug 4788986.
2224 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2225 if (VerifyDuringStartup) {
2226 warning("Heap verification at start-up disabled "
2227 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2228 VerifyDuringStartup = false; // Disable verification at start-up
2229 }
2230
2231 if (VerifyBeforeExit) {
2232 warning("Heap verification at shutdown disabled "
2233 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2234 VerifyBeforeExit = false; // Disable verification at shutdown
2235 }
2236 }
2237
2238 // Note: only executed in non-PRODUCT mode
2239 if (!UseAsyncConcMarkSweepGC &&
2240 (ExplicitGCInvokesConcurrent ||
2241 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2242 jio_fprintf(defaultStream::error_stream(),
2243 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2244 " with -UseAsyncConcMarkSweepGC");
2245 status = false;
2246 }
2247
2248 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2249
2250 #if INCLUDE_ALL_GCS
2251 if (UseG1GC) {
2252 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2253 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2254 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2255
2256 status = status && verify_percentage(G1ConfidencePercent, "G1ConfidencePercent");
2257 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2258 "InitiatingHeapOccupancyPercent");
2259 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2260 "G1RefProcDrainInterval");
2261 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2262 "G1ConcMarkStepDurationMillis");
2263 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2264 "G1ConcRSHotCardLimit");
2265 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2266 "G1ConcRSLogCacheSize");
2267 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2268 "StringDeduplicationAgeThreshold");
2269 }
2270 if (UseConcMarkSweepGC) {
2271 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2272 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2273 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2274 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2275
2276 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2277
2278 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2279 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2280 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2281
2282 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2283
2284 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2285 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2286
2287 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2288 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2289 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2290
2291 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2292
2293 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2294
2295 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2296 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2297 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2298 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2299 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2300 }
2301
2302 if (UseParallelGC || UseParallelOldGC) {
2303 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2304 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2305
2306 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2307 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2308
2309 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2310 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2311
2312 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2313
2314 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2315 }
2316 #endif // INCLUDE_ALL_GCS
2317
2318 status = status && verify_interval(RefDiscoveryPolicy,
2319 ReferenceProcessor::DiscoveryPolicyMin,
2320 ReferenceProcessor::DiscoveryPolicyMax,
2321 "RefDiscoveryPolicy");
2322
2323 // Limit the lower bound of this flag to 1 as it is used in a division
2324 // expression.
2325 status = status && verify_interval(TLABWasteTargetPercent,
2326 1, 100, "TLABWasteTargetPercent");
2327
2328 status = status && verify_object_alignment();
2329
2330 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2331 "CompressedClassSpaceSize");
2332
2333 status = status && verify_interval(MarkStackSizeMax,
2334 1, (max_jint - 1), "MarkStackSizeMax");
2335 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2336
2337 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2338
2339 status = status && verify_min_value(HeapSizePerGCThread, (size_t) os::vm_page_size(), "HeapSizePerGCThread");
2340
2341 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2342
2343 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2344 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2345
2346 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2347
2348 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2349 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2350 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2351 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2352
2353 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2354 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2355
2356 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2357 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2358 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2359
2360 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2361 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2362
2363 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2364 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2365 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2366 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2367
2368 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2369 #ifdef COMPILER1
2370 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2371 #endif
2372 status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps");
2373
2374 if (PrintNMTStatistics) {
2375 #if INCLUDE_NMT
2376 if (MemTracker::tracking_level() == NMT_off) {
2377 #endif // INCLUDE_NMT
2378 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2379 PrintNMTStatistics = false;
2380 #if INCLUDE_NMT
2381 }
2382 #endif
2383 }
2384
2385 // Need to limit the extent of the padding to reasonable size.
2386 // 8K is well beyond the reasonable HW cache line size, even with the
2387 // aggressive prefetching, while still leaving the room for segregating
2388 // among the distinct pages.
2389 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2390 jio_fprintf(defaultStream::error_stream(),
2391 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2392 ContendedPaddingWidth, 0, 8192);
2393 status = false;
2394 }
2395
2396 // Need to enforce the padding not to break the existing field alignments.
2397 // It is sufficient to check against the largest type size.
2398 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2399 jio_fprintf(defaultStream::error_stream(),
2400 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2401 ContendedPaddingWidth, BytesPerLong);
2402 status = false;
2403 }
2404
2405 // Check lower bounds of the code cache
2406 // Template Interpreter code is approximately 3X larger in debug builds.
2407 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2408 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2409 jio_fprintf(defaultStream::error_stream(),
2410 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2411 os::vm_page_size()/K);
2412 status = false;
2413 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2414 jio_fprintf(defaultStream::error_stream(),
2415 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2416 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2417 status = false;
2418 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2419 jio_fprintf(defaultStream::error_stream(),
2420 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2421 min_code_cache_size/K);
2422 status = false;
2423 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2424 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2425 jio_fprintf(defaultStream::error_stream(),
2426 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2427 CODE_CACHE_SIZE_LIMIT/M);
2428 status = false;
2429 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2430 jio_fprintf(defaultStream::error_stream(),
2431 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2432 min_code_cache_size/K);
2433 status = false;
2434 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2435 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2436 jio_fprintf(defaultStream::error_stream(),
2437 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2438 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2439 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2440 status = false;
2441 }
2442
2443 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2444 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2445 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2446 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2447
2448
2449 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2450 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2451 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2452 // Check the minimum number of compiler threads
2453 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2454
2455 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2456 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2457 }
2458
2459 return status;
2460 }
2461
2462 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2463 const char* option_type) {
2464 if (ignore) return false;
2465
2466 const char* spacer = " ";
2467 if (option_type == NULL) {
2468 option_type = ++spacer; // Set both to the empty string.
2469 }
2470
2471 if (os::obsolete_option(option)) {
2472 jio_fprintf(defaultStream::error_stream(),
2473 "Obsolete %s%soption: %s\n", option_type, spacer,
2474 option->optionString);
2475 return false;
2476 } else {
2477 jio_fprintf(defaultStream::error_stream(),
2478 "Unrecognized %s%soption: %s\n", option_type, spacer,
2479 option->optionString);
2480 return true;
2481 }
2482 }
2483
2484 static const char* user_assertion_options[] = {
2485 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2486 };
2487
2488 static const char* system_assertion_options[] = {
2489 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2490 };
2491
2492 bool Arguments::parse_uintx(const char* value,
2493 uintx* uintx_arg,
2494 uintx min_size) {
2495
2496 // Check the sign first since atomull() parses only unsigned values.
2497 bool value_is_positive = !(*value == '-');
2498
2499 if (value_is_positive) {
2500 julong n;
2501 bool good_return = atomull(value, &n);
2502 if (good_return) {
2503 bool above_minimum = n >= min_size;
2504 bool value_is_too_large = n > max_uintx;
2505
2506 if (above_minimum && !value_is_too_large) {
2507 *uintx_arg = n;
2508 return true;
2509 }
2510 }
2511 }
2512 return false;
2513 }
2514
2515 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2516 julong* long_arg,
2517 julong min_size) {
2518 if (!atomull(s, long_arg)) return arg_unreadable;
2519 return check_memory_size(*long_arg, min_size);
2520 }
2521
2522 // Parse JavaVMInitArgs structure
2523
2524 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2525 // For components of the system classpath.
2526 SysClassPath scp(Arguments::get_sysclasspath());
2527 bool scp_assembly_required = false;
2528
2529 // Save default settings for some mode flags
2530 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2531 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2532 Arguments::_ClipInlining = ClipInlining;
2533 Arguments::_BackgroundCompilation = BackgroundCompilation;
2534
2535 // Setup flags for mixed which is the default
2536 set_mode_flags(_mixed);
2537
2538 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2539 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2540 if (result != JNI_OK) {
2541 return result;
2542 }
2543
2544 // Parse JavaVMInitArgs structure passed in
2545 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2546 if (result != JNI_OK) {
2547 return result;
2548 }
2549
2550 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2551 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2552 if (result != JNI_OK) {
2553 return result;
2554 }
2555
2556 // Do final processing now that all arguments have been parsed
2557 result = finalize_vm_init_args(&scp, scp_assembly_required);
2558 if (result != JNI_OK) {
2559 return result;
2560 }
2561
2562 return JNI_OK;
2563 }
2564
2565 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2566 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2567 // are dealing with -agentpath (case where name is a path), otherwise with
2568 // -agentlib
2569 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2570 char *_name;
2571 const char *_hprof = "hprof", *_jdwp = "jdwp";
2572 size_t _len_hprof, _len_jdwp, _len_prefix;
2573
2574 if (is_path) {
2575 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2576 return false;
2577 }
2578
2579 _name++; // skip past last path separator
2580 _len_prefix = strlen(JNI_LIB_PREFIX);
2581
2582 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2583 return false;
2584 }
2585
2586 _name += _len_prefix;
2587 _len_hprof = strlen(_hprof);
2588 _len_jdwp = strlen(_jdwp);
2589
2590 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2591 _name += _len_hprof;
2592 }
2593 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2594 _name += _len_jdwp;
2595 }
2596 else {
2597 return false;
2598 }
2599
2600 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2601 return false;
2602 }
2603
2604 return true;
2605 }
2606
2607 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2608 return true;
2609 }
2610
2611 return false;
2612 }
2613
2614 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2615 SysClassPath* scp_p,
2616 bool* scp_assembly_required_p,
2617 Flag::Flags origin) {
2618 // Remaining part of option string
2619 const char* tail;
2620
2621 // iterate over arguments
2622 for (int index = 0; index < args->nOptions; index++) {
2623 bool is_absolute_path = false; // for -agentpath vs -agentlib
2624
2625 const JavaVMOption* option = args->options + index;
2626
2627 if (!match_option(option, "-Djava.class.path", &tail) &&
2628 !match_option(option, "-Dsun.java.command", &tail) &&
2629 !match_option(option, "-Dsun.java.launcher", &tail)) {
2630
2631 // add all jvm options to the jvm_args string. This string
2632 // is used later to set the java.vm.args PerfData string constant.
2633 // the -Djava.class.path and the -Dsun.java.command options are
2634 // omitted from jvm_args string as each have their own PerfData
2635 // string constant object.
2636 build_jvm_args(option->optionString);
2637 }
2638
2639 // -verbose:[class/gc/jni]
2640 if (match_option(option, "-verbose", &tail)) {
2641 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2642 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2643 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2644 } else if (!strcmp(tail, ":gc")) {
2645 FLAG_SET_CMDLINE(bool, PrintGC, true);
2646 } else if (!strcmp(tail, ":jni")) {
2647 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2648 }
2649 // -da / -ea / -disableassertions / -enableassertions
2650 // These accept an optional class/package name separated by a colon, e.g.,
2651 // -da:java.lang.Thread.
2652 } else if (match_option(option, user_assertion_options, &tail, true)) {
2653 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2654 if (*tail == '\0') {
2655 JavaAssertions::setUserClassDefault(enable);
2656 } else {
2657 assert(*tail == ':', "bogus match by match_option()");
2658 JavaAssertions::addOption(tail + 1, enable);
2659 }
2660 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2661 } else if (match_option(option, system_assertion_options, &tail, false)) {
2662 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2663 JavaAssertions::setSystemClassDefault(enable);
2664 // -bootclasspath:
2665 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2666 scp_p->reset_path(tail);
2667 *scp_assembly_required_p = true;
2668 // -bootclasspath/a:
2669 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2670 scp_p->add_suffix(tail);
2671 *scp_assembly_required_p = true;
2672 // -bootclasspath/p:
2673 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2674 scp_p->add_prefix(tail);
2675 *scp_assembly_required_p = true;
2676 // -Xrun
2677 } else if (match_option(option, "-Xrun", &tail)) {
2678 if (tail != NULL) {
2679 const char* pos = strchr(tail, ':');
2680 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2681 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2682 name[len] = '\0';
2683
2684 char *options = NULL;
2685 if(pos != NULL) {
2686 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2687 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2688 }
2689 #if !INCLUDE_JVMTI
2690 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2691 jio_fprintf(defaultStream::error_stream(),
2692 "Profiling and debugging agents are not supported in this VM\n");
2693 return JNI_ERR;
2694 }
2695 #endif // !INCLUDE_JVMTI
2696 add_init_library(name, options);
2697 }
2698 // -agentlib and -agentpath
2699 } else if (match_option(option, "-agentlib:", &tail) ||
2700 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2701 if(tail != NULL) {
2702 const char* pos = strchr(tail, '=');
2703 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2704 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2705 name[len] = '\0';
2706
2707 char *options = NULL;
2708 if(pos != NULL) {
2709 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2710 }
2711 #if !INCLUDE_JVMTI
2712 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2713 jio_fprintf(defaultStream::error_stream(),
2714 "Profiling and debugging agents are not supported in this VM\n");
2715 return JNI_ERR;
2716 }
2717 #endif // !INCLUDE_JVMTI
2718 add_init_agent(name, options, is_absolute_path);
2719 }
2720 // -javaagent
2721 } else if (match_option(option, "-javaagent:", &tail)) {
2722 #if !INCLUDE_JVMTI
2723 jio_fprintf(defaultStream::error_stream(),
2724 "Instrumentation agents are not supported in this VM\n");
2725 return JNI_ERR;
2726 #else
2727 if(tail != NULL) {
2728 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2729 add_init_agent("instrument", options, false);
2730 }
2731 #endif // !INCLUDE_JVMTI
2732 // -Xnoclassgc
2733 } else if (match_option(option, "-Xnoclassgc")) {
2734 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2735 // -Xconcgc
2736 } else if (match_option(option, "-Xconcgc")) {
2737 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2738 // -Xnoconcgc
2739 } else if (match_option(option, "-Xnoconcgc")) {
2740 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2741 // -Xbatch
2742 } else if (match_option(option, "-Xbatch")) {
2743 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2744 // -Xmn for compatibility with other JVM vendors
2745 } else if (match_option(option, "-Xmn", &tail)) {
2746 julong long_initial_young_size = 0;
2747 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2748 if (errcode != arg_in_range) {
2749 jio_fprintf(defaultStream::error_stream(),
2750 "Invalid initial young generation size: %s\n", option->optionString);
2751 describe_range_error(errcode);
2752 return JNI_EINVAL;
2753 }
2754 FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size);
2755 FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size);
2756 // -Xms
2757 } else if (match_option(option, "-Xms", &tail)) {
2758 julong long_initial_heap_size = 0;
2759 // an initial heap size of 0 means automatically determine
2760 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2761 if (errcode != arg_in_range) {
2762 jio_fprintf(defaultStream::error_stream(),
2763 "Invalid initial heap size: %s\n", option->optionString);
2764 describe_range_error(errcode);
2765 return JNI_EINVAL;
2766 }
2767 set_min_heap_size((size_t)long_initial_heap_size);
2768 // Currently the minimum size and the initial heap sizes are the same.
2769 // Can be overridden with -XX:InitialHeapSize.
2770 FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size);
2771 // -Xmx
2772 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2773 julong long_max_heap_size = 0;
2774 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2775 if (errcode != arg_in_range) {
2776 jio_fprintf(defaultStream::error_stream(),
2777 "Invalid maximum heap size: %s\n", option->optionString);
2778 describe_range_error(errcode);
2779 return JNI_EINVAL;
2780 }
2781 FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size);
2782 // Xmaxf
2783 } else if (match_option(option, "-Xmaxf", &tail)) {
2784 char* err;
2785 int maxf = (int)(strtod(tail, &err) * 100);
2786 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2787 jio_fprintf(defaultStream::error_stream(),
2788 "Bad max heap free percentage size: %s\n",
2789 option->optionString);
2790 return JNI_EINVAL;
2791 } else {
2792 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2793 }
2794 // Xminf
2795 } else if (match_option(option, "-Xminf", &tail)) {
2796 char* err;
2797 int minf = (int)(strtod(tail, &err) * 100);
2798 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2799 jio_fprintf(defaultStream::error_stream(),
2800 "Bad min heap free percentage size: %s\n",
2801 option->optionString);
2802 return JNI_EINVAL;
2803 } else {
2804 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2805 }
2806 // -Xss
2807 } else if (match_option(option, "-Xss", &tail)) {
2808 julong long_ThreadStackSize = 0;
2809 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2810 if (errcode != arg_in_range) {
2811 jio_fprintf(defaultStream::error_stream(),
2812 "Invalid thread stack size: %s\n", option->optionString);
2813 describe_range_error(errcode);
2814 return JNI_EINVAL;
2815 }
2816 // Internally track ThreadStackSize in units of 1024 bytes.
2817 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2818 round_to((int)long_ThreadStackSize, K) / K);
2819 // -Xoss
2820 } else if (match_option(option, "-Xoss", &tail)) {
2821 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2822 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2823 julong long_CodeCacheExpansionSize = 0;
2824 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2825 if (errcode != arg_in_range) {
2826 jio_fprintf(defaultStream::error_stream(),
2827 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2828 os::vm_page_size()/K);
2829 return JNI_EINVAL;
2830 }
2831 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2832 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2833 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2834 julong long_ReservedCodeCacheSize = 0;
2835
2836 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2837 if (errcode != arg_in_range) {
2838 jio_fprintf(defaultStream::error_stream(),
2839 "Invalid maximum code cache size: %s.\n", option->optionString);
2840 return JNI_EINVAL;
2841 }
2842 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2843 // -XX:NonNMethodCodeHeapSize=
2844 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2845 julong long_NonNMethodCodeHeapSize = 0;
2846
2847 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2848 if (errcode != arg_in_range) {
2849 jio_fprintf(defaultStream::error_stream(),
2850 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2851 return JNI_EINVAL;
2852 }
2853 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
2854 // -XX:ProfiledCodeHeapSize=
2855 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2856 julong long_ProfiledCodeHeapSize = 0;
2857
2858 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2859 if (errcode != arg_in_range) {
2860 jio_fprintf(defaultStream::error_stream(),
2861 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2862 return JNI_EINVAL;
2863 }
2864 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2865 // -XX:NonProfiledCodeHeapSizee=
2866 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2867 julong long_NonProfiledCodeHeapSize = 0;
2868
2869 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2870 if (errcode != arg_in_range) {
2871 jio_fprintf(defaultStream::error_stream(),
2872 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2873 return JNI_EINVAL;
2874 }
2875 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2876 //-XX:IncreaseFirstTierCompileThresholdAt=
2877 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2878 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2879 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2880 jio_fprintf(defaultStream::error_stream(),
2881 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2882 option->optionString);
2883 return JNI_EINVAL;
2884 }
2885 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2886 // -green
2887 } else if (match_option(option, "-green")) {
2888 jio_fprintf(defaultStream::error_stream(),
2889 "Green threads support not available\n");
2890 return JNI_EINVAL;
2891 // -native
2892 } else if (match_option(option, "-native")) {
2893 // HotSpot always uses native threads, ignore silently for compatibility
2894 // -Xsqnopause
2895 } else if (match_option(option, "-Xsqnopause")) {
2896 // EVM option, ignore silently for compatibility
2897 // -Xrs
2898 } else if (match_option(option, "-Xrs")) {
2899 // Classic/EVM option, new functionality
2900 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2901 } else if (match_option(option, "-Xusealtsigs")) {
2902 // change default internal VM signals used - lower case for back compat
2903 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2904 // -Xoptimize
2905 } else if (match_option(option, "-Xoptimize")) {
2906 // EVM option, ignore silently for compatibility
2907 // -Xprof
2908 } else if (match_option(option, "-Xprof")) {
2909 #if INCLUDE_FPROF
2910 _has_profile = true;
2911 #else // INCLUDE_FPROF
2912 jio_fprintf(defaultStream::error_stream(),
2913 "Flat profiling is not supported in this VM.\n");
2914 return JNI_ERR;
2915 #endif // INCLUDE_FPROF
2916 // -Xconcurrentio
2917 } else if (match_option(option, "-Xconcurrentio")) {
2918 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2919 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2920 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2921 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2922 FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2923
2924 // -Xinternalversion
2925 } else if (match_option(option, "-Xinternalversion")) {
2926 jio_fprintf(defaultStream::output_stream(), "%s\n",
2927 VM_Version::internal_vm_info_string());
2928 vm_exit(0);
2929 #ifndef PRODUCT
2930 // -Xprintflags
2931 } else if (match_option(option, "-Xprintflags")) {
2932 CommandLineFlags::printFlags(tty, false);
2933 vm_exit(0);
2934 #endif
2935 // -D
2936 } else if (match_option(option, "-D", &tail)) {
2937 const char* value;
2938 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2939 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2940 // abort if -Djava.endorsed.dirs is set
2941 jio_fprintf(defaultStream::output_stream(),
2942 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2943 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2944 return JNI_EINVAL;
2945 }
2946 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2947 *value != '\0' && strcmp(value, "\"\"") != 0) {
2948 // abort if -Djava.ext.dirs is set
2949 jio_fprintf(defaultStream::output_stream(),
2950 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2951 return JNI_EINVAL;
2952 }
2953
2954 if (!add_property(tail)) {
2955 return JNI_ENOMEM;
2956 }
2957 // Out of the box management support
2958 if (match_option(option, "-Dcom.sun.management", &tail)) {
2959 #if INCLUDE_MANAGEMENT
2960 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2961 #else
2962 jio_fprintf(defaultStream::output_stream(),
2963 "-Dcom.sun.management is not supported in this VM.\n");
2964 return JNI_ERR;
2965 #endif
2966 }
2967 // -Xint
2968 } else if (match_option(option, "-Xint")) {
2969 set_mode_flags(_int);
2970 // -Xmixed
2971 } else if (match_option(option, "-Xmixed")) {
2972 set_mode_flags(_mixed);
2973 // -Xcomp
2974 } else if (match_option(option, "-Xcomp")) {
2975 // for testing the compiler; turn off all flags that inhibit compilation
2976 set_mode_flags(_comp);
2977 // -Xshare:dump
2978 } else if (match_option(option, "-Xshare:dump")) {
2979 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2980 set_mode_flags(_int); // Prevent compilation, which creates objects
2981 // -Xshare:on
2982 } else if (match_option(option, "-Xshare:on")) {
2983 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2984 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2985 // -Xshare:auto
2986 } else if (match_option(option, "-Xshare:auto")) {
2987 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2988 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2989 // -Xshare:off
2990 } else if (match_option(option, "-Xshare:off")) {
2991 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2992 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2993 // -Xverify
2994 } else if (match_option(option, "-Xverify", &tail)) {
2995 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2996 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2997 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2998 } else if (strcmp(tail, ":remote") == 0) {
2999 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3000 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3001 } else if (strcmp(tail, ":none") == 0) {
3002 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3003 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3004 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3005 return JNI_EINVAL;
3006 }
3007 // -Xdebug
3008 } else if (match_option(option, "-Xdebug")) {
3009 // note this flag has been used, then ignore
3010 set_xdebug_mode(true);
3011 // -Xnoagent
3012 } else if (match_option(option, "-Xnoagent")) {
3013 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3014 } else if (match_option(option, "-Xboundthreads")) {
3015 // Bind user level threads to kernel threads (Solaris only)
3016 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3017 } else if (match_option(option, "-Xloggc:", &tail)) {
3018 // Redirect GC output to the file. -Xloggc:<filename>
3019 // ostream_init_log(), when called will use this filename
3020 // to initialize a fileStream.
3021 _gc_log_filename = os::strdup_check_oom(tail);
3022 if (!is_filename_valid(_gc_log_filename)) {
3023 jio_fprintf(defaultStream::output_stream(),
3024 "Invalid file name for use with -Xloggc: Filename can only contain the "
3025 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3026 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3027 return JNI_EINVAL;
3028 }
3029 FLAG_SET_CMDLINE(bool, PrintGC, true);
3030 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3031
3032 // JNI hooks
3033 } else if (match_option(option, "-Xcheck", &tail)) {
3034 if (!strcmp(tail, ":jni")) {
3035 #if !INCLUDE_JNI_CHECK
3036 warning("JNI CHECKING is not supported in this VM");
3037 #else
3038 CheckJNICalls = true;
3039 #endif // INCLUDE_JNI_CHECK
3040 } else if (is_bad_option(option, args->ignoreUnrecognized,
3041 "check")) {
3042 return JNI_EINVAL;
3043 }
3044 } else if (match_option(option, "vfprintf")) {
3045 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3046 } else if (match_option(option, "exit")) {
3047 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3048 } else if (match_option(option, "abort")) {
3049 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3050 // -XX:+AggressiveHeap
3051 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3052
3053 // This option inspects the machine and attempts to set various
3054 // parameters to be optimal for long-running, memory allocation
3055 // intensive jobs. It is intended for machines with large
3056 // amounts of cpu and memory.
3057
3058 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3059 // VM, but we may not be able to represent the total physical memory
3060 // available (like having 8gb of memory on a box but using a 32bit VM).
3061 // Thus, we need to make sure we're using a julong for intermediate
3062 // calculations.
3063 julong initHeapSize;
3064 julong total_memory = os::physical_memory();
3065
3066 if (total_memory < (julong)256*M) {
3067 jio_fprintf(defaultStream::error_stream(),
3068 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3069 vm_exit(1);
3070 }
3071
3072 // The heap size is half of available memory, or (at most)
3073 // all of possible memory less 160mb (leaving room for the OS
3074 // when using ISM). This is the maximum; because adaptive sizing
3075 // is turned on below, the actual space used may be smaller.
3076
3077 initHeapSize = MIN2(total_memory / (julong)2,
3078 total_memory - (julong)160*M);
3079
3080 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3081
3082 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3083 FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize);
3084 FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize);
3085 // Currently the minimum size and the initial heap sizes are the same.
3086 set_min_heap_size(initHeapSize);
3087 }
3088 if (FLAG_IS_DEFAULT(NewSize)) {
3089 // Make the young generation 3/8ths of the total heap.
3090 FLAG_SET_CMDLINE(size_t, NewSize,
3091 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3092 FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize);
3093 }
3094
3095 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3096 FLAG_SET_DEFAULT(UseLargePages, true);
3097 #endif
3098
3099 // Increase some data structure sizes for efficiency
3100 FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize);
3101 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3102 FLAG_SET_CMDLINE(size_t, TLABSize, 256*K);
3103
3104 // See the OldPLABSize comment below, but replace 'after promotion'
3105 // with 'after copying'. YoungPLABSize is the size of the survivor
3106 // space per-gc-thread buffers. The default is 4kw.
3107 FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K); // Note: this is in words
3108
3109 // OldPLABSize is the size of the buffers in the old gen that
3110 // UseParallelGC uses to promote live data that doesn't fit in the
3111 // survivor spaces. At any given time, there's one for each gc thread.
3112 // The default size is 1kw. These buffers are rarely used, since the
3113 // survivor spaces are usually big enough. For specjbb, however, there
3114 // are occasions when there's lots of live data in the young gen
3115 // and we end up promoting some of it. We don't have a definite
3116 // explanation for why bumping OldPLABSize helps, but the theory
3117 // is that a bigger PLAB results in retaining something like the
3118 // original allocation order after promotion, which improves mutator
3119 // locality. A minor effect may be that larger PLABs reduce the
3120 // number of PLAB allocation events during gc. The value of 8kw
3121 // was arrived at by experimenting with specjbb.
3122 FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K); // Note: this is in words
3123
3124 // Enable parallel GC and adaptive generation sizing
3125 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3126 FLAG_SET_DEFAULT(ParallelGCThreads,
3127 Abstract_VM_Version::parallel_worker_threads());
3128
3129 // Encourage steady state memory management
3130 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3131
3132 // This appears to improve mutator locality
3133 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3134
3135 // Get around early Solaris scheduling bug
3136 // (affinity vs other jobs on system)
3137 // but disallow DR and offlining (5008695).
3138 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3139
3140 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3141 // and the last option wins.
3142 } else if (match_option(option, "-XX:+NeverTenure")) {
3143 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3144 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3145 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3146 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3147 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3148 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3149 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3150 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3151 uintx max_tenuring_thresh = 0;
3152 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3153 jio_fprintf(defaultStream::error_stream(),
3154 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3155 }
3156 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3157
3158 if (MaxTenuringThreshold == 0) {
3159 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3160 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3161 } else {
3162 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3163 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3164 }
3165 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3166 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3167 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3168 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3169 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3170 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3171 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3172 #if defined(DTRACE_ENABLED)
3173 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3174 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3175 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3176 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3177 #else // defined(DTRACE_ENABLED)
3178 jio_fprintf(defaultStream::error_stream(),
3179 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3180 return JNI_EINVAL;
3181 #endif // defined(DTRACE_ENABLED)
3182 #ifdef ASSERT
3183 } else if (match_option(option, "-XX:+FullGCALot")) {
3184 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3185 // disable scavenge before parallel mark-compact
3186 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3187 #endif
3188 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3189 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3190 julong stack_size = 0;
3191 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3192 if (errcode != arg_in_range) {
3193 jio_fprintf(defaultStream::error_stream(),
3194 "Invalid mark stack size: %s\n", option->optionString);
3195 describe_range_error(errcode);
3196 return JNI_EINVAL;
3197 }
3198 jio_fprintf(defaultStream::error_stream(),
3199 "Please use -XX:MarkStackSize in place of "
3200 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n");
3201 FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size);
3202 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3203 julong max_stack_size = 0;
3204 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3205 if (errcode != arg_in_range) {
3206 jio_fprintf(defaultStream::error_stream(),
3207 "Invalid maximum mark stack size: %s\n",
3208 option->optionString);
3209 describe_range_error(errcode);
3210 return JNI_EINVAL;
3211 }
3212 jio_fprintf(defaultStream::error_stream(),
3213 "Please use -XX:MarkStackSizeMax in place of "
3214 "-XX:CMSMarkStackSizeMax in the future\n");
3215 FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size);
3216 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3217 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3218 uintx conc_threads = 0;
3219 if (!parse_uintx(tail, &conc_threads, 1)) {
3220 jio_fprintf(defaultStream::error_stream(),
3221 "Invalid concurrent threads: %s\n", option->optionString);
3222 return JNI_EINVAL;
3223 }
3224 jio_fprintf(defaultStream::error_stream(),
3225 "Please use -XX:ConcGCThreads in place of "
3226 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n");
3227 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3228 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3229 julong max_direct_memory_size = 0;
3230 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3231 if (errcode != arg_in_range) {
3232 jio_fprintf(defaultStream::error_stream(),
3233 "Invalid maximum direct memory size: %s\n",
3234 option->optionString);
3235 describe_range_error(errcode);
3236 return JNI_EINVAL;
3237 }
3238 FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size);
3239 #if !INCLUDE_MANAGEMENT
3240 } else if (match_option(option, "-XX:+ManagementServer")) {
3241 jio_fprintf(defaultStream::error_stream(),
3242 "ManagementServer is not supported in this VM.\n");
3243 return JNI_ERR;
3244 #endif // INCLUDE_MANAGEMENT
3245 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3246 // Skip -XX:Flags= since that case has already been handled
3247 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3248 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3249 return JNI_EINVAL;
3250 }
3251 }
3252 // Unknown option
3253 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3254 return JNI_ERR;
3255 }
3256 }
3257
3258 // PrintSharedArchiveAndExit will turn on
3259 // -Xshare:on
3260 // -XX:+TraceClassPaths
3261 if (PrintSharedArchiveAndExit) {
3262 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3263 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3264 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3265 }
3266
3267 // Change the default value for flags which have different default values
3268 // when working with older JDKs.
3269 #ifdef LINUX
3270 if (JDK_Version::current().compare_major(6) <= 0 &&
3271 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3272 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3273 }
3274 #endif // LINUX
3275 fix_appclasspath();
3276 return JNI_OK;
3277 }
3278
3279 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3280 //
3281 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3282 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3283 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3284 // path is treated as the current directory.
3285 //
3286 // This causes problems with CDS, which requires that all directories specified in the classpath
3287 // must be empty. In most cases, applications do NOT want to load classes from the current
3288 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3289 // scripts compatible with CDS.
3290 void Arguments::fix_appclasspath() {
3291 if (IgnoreEmptyClassPaths) {
3292 const char separator = *os::path_separator();
3293 const char* src = _java_class_path->value();
3294
3295 // skip over all the leading empty paths
3296 while (*src == separator) {
3297 src ++;
3298 }
3299
3300 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3301 strncpy(copy, src, strlen(src) + 1);
3302
3303 // trim all trailing empty paths
3304 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3305 *tail = '\0';
3306 }
3307
3308 char from[3] = {separator, separator, '\0'};
3309 char to [2] = {separator, '\0'};
3310 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3311 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3312 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3313 }
3314
3315 _java_class_path->set_value(copy);
3316 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3317 }
3318
3319 if (!PrintSharedArchiveAndExit) {
3320 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3321 }
3322 }
3323
3324 static bool has_jar_files(const char* directory) {
3325 DIR* dir = os::opendir(directory);
3326 if (dir == NULL) return false;
3327
3328 struct dirent *entry;
3329 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3330 bool hasJarFile = false;
3331 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3332 const char* name = entry->d_name;
3333 const char* ext = name + strlen(name) - 4;
3334 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3335 }
3336 FREE_C_HEAP_ARRAY(char, dbuf);
3337 os::closedir(dir);
3338 return hasJarFile ;
3339 }
3340
3341 static int check_non_empty_dirs(const char* path) {
3342 const char separator = *os::path_separator();
3343 const char* const end = path + strlen(path);
3344 int nonEmptyDirs = 0;
3345 while (path < end) {
3346 const char* tmp_end = strchr(path, separator);
3347 if (tmp_end == NULL) {
3348 if (has_jar_files(path)) {
3349 nonEmptyDirs++;
3350 jio_fprintf(defaultStream::output_stream(),
3351 "Non-empty directory: %s\n", path);
3352 }
3353 path = end;
3354 } else {
3355 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3356 memcpy(dirpath, path, tmp_end - path);
3357 dirpath[tmp_end - path] = '\0';
3358 if (has_jar_files(dirpath)) {
3359 nonEmptyDirs++;
3360 jio_fprintf(defaultStream::output_stream(),
3361 "Non-empty directory: %s\n", dirpath);
3362 }
3363 FREE_C_HEAP_ARRAY(char, dirpath);
3364 path = tmp_end + 1;
3365 }
3366 }
3367 return nonEmptyDirs;
3368 }
3369
3370 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3371 // check if the default lib/endorsed directory exists; if so, error
3372 char path[JVM_MAXPATHLEN];
3373 const char* fileSep = os::file_separator();
3374 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3375
3376 if (CheckEndorsedAndExtDirs) {
3377 int nonEmptyDirs = 0;
3378 // check endorsed directory
3379 nonEmptyDirs += check_non_empty_dirs(path);
3380 // check the extension directories
3381 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3382 if (nonEmptyDirs > 0) {
3383 return JNI_ERR;
3384 }
3385 }
3386
3387 DIR* dir = os::opendir(path);
3388 if (dir != NULL) {
3389 jio_fprintf(defaultStream::output_stream(),
3390 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3391 "in modular form will be supported via the concept of upgradeable modules.\n");
3392 os::closedir(dir);
3393 return JNI_ERR;
3394 }
3395
3396 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3397 dir = os::opendir(path);
3398 if (dir != NULL) {
3399 jio_fprintf(defaultStream::output_stream(),
3400 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3401 "Use -classpath instead.\n.");
3402 os::closedir(dir);
3403 return JNI_ERR;
3404 }
3405
3406 if (scp_assembly_required) {
3407 // Assemble the bootclasspath elements into the final path.
3408 Arguments::set_sysclasspath(scp_p->combined_path());
3409 }
3410
3411 // This must be done after all arguments have been processed.
3412 // java_compiler() true means set to "NONE" or empty.
3413 if (java_compiler() && !xdebug_mode()) {
3414 // For backwards compatibility, we switch to interpreted mode if
3415 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3416 // not specified.
3417 set_mode_flags(_int);
3418 }
3419
3420 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3421 // but like -Xint, leave compilation thresholds unaffected.
3422 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3423 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3424 set_mode_flags(_int);
3425 }
3426
3427 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3428 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3429 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3430 }
3431
3432 #ifndef COMPILER2
3433 // Don't degrade server performance for footprint
3434 if (FLAG_IS_DEFAULT(UseLargePages) &&
3435 MaxHeapSize < LargePageHeapSizeThreshold) {
3436 // No need for large granularity pages w/small heaps.
3437 // Note that large pages are enabled/disabled for both the
3438 // Java heap and the code cache.
3439 FLAG_SET_DEFAULT(UseLargePages, false);
3440 }
3441
3442 #else
3443 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3444 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3445 }
3446 #endif
3447
3448 #ifndef TIERED
3449 // Tiered compilation is undefined.
3450 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3451 #endif
3452
3453 // If we are running in a headless jre, force java.awt.headless property
3454 // to be true unless the property has already been set.
3455 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3456 if (os::is_headless_jre()) {
3457 const char* headless = Arguments::get_property("java.awt.headless");
3458 if (headless == NULL) {
3459 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3460 if (headless_env == NULL) {
3461 if (!add_property("java.awt.headless=true")) {
3462 return JNI_ENOMEM;
3463 }
3464 } else {
3465 char buffer[256];
3466 const char *key = "java.awt.headless=";
3467 strcpy(buffer, key);
3468 strncat(buffer, headless_env, 256 - strlen(key) - 1);
3469 if (!add_property(buffer)) {
3470 return JNI_ENOMEM;
3471 }
3472 }
3473 }
3474 }
3475
3476 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3477 // CMS can only be used with ParNew
3478 FLAG_SET_ERGO(bool, UseParNewGC, true);
3479 }
3480
3481 if (!check_vm_args_consistency()) {
3482 return JNI_ERR;
3483 }
3484
3485 return JNI_OK;
3486 }
3487
3488 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3489 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3490 scp_assembly_required_p);
3491 }
3492
3493 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3494 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3495 scp_assembly_required_p);
3496 }
3497
3498 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3499 char *buffer = ::getenv(name);
3500
3501 // Don't check this variable if user has special privileges
3502 // (e.g. unix su command).
3503 if (buffer == NULL || os::have_special_privileges()) {
3504 return JNI_OK;
3505 }
3506
3507 if ((buffer = os::strdup(buffer)) == NULL) {
3508 return JNI_ENOMEM;
3509 }
3510
3511 GrowableArray<JavaVMOption> options(2, true); // Construct option array
3512 jio_fprintf(defaultStream::error_stream(),
3513 "Picked up %s: %s\n", name, buffer);
3514 char* rd = buffer; // pointer to the input string (rd)
3515 while (true) { // repeat for all options in the input string
3516 while (isspace(*rd)) rd++; // skip whitespace
3517 if (*rd == 0) break; // we re done when the input string is read completely
3518
3519 // The output, option string, overwrites the input string.
3520 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3521 // input string (rd).
3522 char* wrt = rd;
3523
3524 JavaVMOption option;
3525 option.optionString = wrt;
3526 options.append(option); // Fill in option
3527 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3528 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3529 int quote = *rd; // matching quote to look for
3530 rd++; // don't copy open quote
3531 while (*rd != quote) { // include everything (even spaces) up until quote
3532 if (*rd == 0) { // string termination means unmatched string
3533 jio_fprintf(defaultStream::error_stream(),
3534 "Unmatched quote in %s\n", name);
3535 os::free(buffer);
3536 return JNI_ERR;
3537 }
3538 *wrt++ = *rd++; // copy to option string
3539 }
3540 rd++; // don't copy close quote
3541 } else {
3542 *wrt++ = *rd++; // copy to option string
3543 }
3544 }
3545 // Need to check if we're done before writing a NULL,
3546 // because the write could be to the byte that rd is pointing to.
3547 if (*rd++ == 0) {
3548 *wrt = 0;
3549 break;
3550 }
3551 *wrt = 0; // Zero terminate option
3552 }
3553 JavaVMOption* options_arr =
3554 NEW_C_HEAP_ARRAY_RETURN_NULL(JavaVMOption, options.length(), mtInternal);
3555 if (options_arr == NULL) {
3556 return JNI_ENOMEM;
3557 }
3558 for (int i = 0; i < options.length(); i++) {
3559 options_arr[i] = options.at(i);
3560 }
3561
3562 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3563 JavaVMInitArgs vm_args;
3564 vm_args.version = JNI_VERSION_1_2;
3565 vm_args.options = options_arr;
3566 vm_args.nOptions = options.length();
3567 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3568
3569 if (PrintVMOptions) {
3570 const char* tail;
3571 for (int i = 0; i < vm_args.nOptions; i++) {
3572 const JavaVMOption *option = vm_args.options + i;
3573 if (match_option(option, "-XX:", &tail)) {
3574 logOption(tail);
3575 }
3576 }
3577 }
3578
3579 jint result = parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p,
3580 Flag::ENVIRON_VAR);
3581 FREE_C_HEAP_ARRAY(JavaVMOption, options_arr);
3582 os::free(buffer);
3583 return result;
3584 }
3585
3586 void Arguments::set_shared_spaces_flags() {
3587 if (DumpSharedSpaces) {
3588 if (RequireSharedSpaces) {
3589 warning("cannot dump shared archive while using shared archive");
3590 }
3591 UseSharedSpaces = false;
3592 #ifdef _LP64
3593 if (!UseCompressedOops || !UseCompressedClassPointers) {
3594 vm_exit_during_initialization(
3595 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3596 }
3597 } else {
3598 if (!UseCompressedOops || !UseCompressedClassPointers) {
3599 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3600 }
3601 #endif
3602 }
3603 }
3604
3605 #if !INCLUDE_ALL_GCS
3606 static void force_serial_gc() {
3607 FLAG_SET_DEFAULT(UseSerialGC, true);
3608 UNSUPPORTED_GC_OPTION(UseG1GC);
3609 UNSUPPORTED_GC_OPTION(UseParallelGC);
3610 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3611 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3612 UNSUPPORTED_GC_OPTION(UseParNewGC);
3613 }
3614 #endif // INCLUDE_ALL_GCS
3615
3616 // Sharing support
3617 // Construct the path to the archive
3618 static char* get_shared_archive_path() {
3619 char *shared_archive_path;
3620 if (SharedArchiveFile == NULL) {
3621 char jvm_path[JVM_MAXPATHLEN];
3622 os::jvm_path(jvm_path, sizeof(jvm_path));
3623 char *end = strrchr(jvm_path, *os::file_separator());
3624 if (end != NULL) *end = '\0';
3625 size_t jvm_path_len = strlen(jvm_path);
3626 size_t file_sep_len = strlen(os::file_separator());
3627 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3628 file_sep_len + 20, mtInternal);
3629 if (shared_archive_path != NULL) {
3630 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3631 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3632 strncat(shared_archive_path, "classes.jsa", 11);
3633 }
3634 } else {
3635 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3636 if (shared_archive_path != NULL) {
3637 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3638 }
3639 }
3640 return shared_archive_path;
3641 }
3642
3643 #ifndef PRODUCT
3644 // Determine whether LogVMOutput should be implicitly turned on.
3645 static bool use_vm_log() {
3646 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3647 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3648 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3649 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3650 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3651 return true;
3652 }
3653
3654 #ifdef COMPILER1
3655 if (PrintC1Statistics) {
3656 return true;
3657 }
3658 #endif // COMPILER1
3659
3660 #ifdef COMPILER2
3661 if (PrintOptoAssembly || PrintOptoStatistics) {
3662 return true;
3663 }
3664 #endif // COMPILER2
3665
3666 return false;
3667 }
3668 #endif // PRODUCT
3669
3670 // Parse entry point called from JNI_CreateJavaVM
3671
3672 jint Arguments::parse(const JavaVMInitArgs* args) {
3673
3674 // Remaining part of option string
3675 const char* tail;
3676
3677 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3678 const char* hotspotrc = ".hotspotrc";
3679 bool settings_file_specified = false;
3680 bool needs_hotspotrc_warning = false;
3681
3682 const char* flags_file;
3683 int index;
3684 for (index = 0; index < args->nOptions; index++) {
3685 const JavaVMOption *option = args->options + index;
3686 if (ArgumentsExt::process_options(option)) {
3687 continue;
3688 }
3689 if (match_option(option, "-XX:Flags=", &tail)) {
3690 flags_file = tail;
3691 settings_file_specified = true;
3692 continue;
3693 }
3694 if (match_option(option, "-XX:+PrintVMOptions")) {
3695 PrintVMOptions = true;
3696 continue;
3697 }
3698 if (match_option(option, "-XX:-PrintVMOptions")) {
3699 PrintVMOptions = false;
3700 continue;
3701 }
3702 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3703 IgnoreUnrecognizedVMOptions = true;
3704 continue;
3705 }
3706 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3707 IgnoreUnrecognizedVMOptions = false;
3708 continue;
3709 }
3710 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3711 CommandLineFlags::printFlags(tty, false);
3712 vm_exit(0);
3713 }
3714 #if INCLUDE_NMT
3715 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3716 // The launcher did not setup nmt environment variable properly.
3717 if (!MemTracker::check_launcher_nmt_support(tail)) {
3718 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3719 }
3720
3721 // Verify if nmt option is valid.
3722 if (MemTracker::verify_nmt_option()) {
3723 // Late initialization, still in single-threaded mode.
3724 if (MemTracker::tracking_level() >= NMT_summary) {
3725 MemTracker::init();
3726 }
3727 } else {
3728 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3729 }
3730 continue;
3731 }
3732 #endif
3733
3734
3735 #ifndef PRODUCT
3736 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3737 CommandLineFlags::printFlags(tty, true);
3738 vm_exit(0);
3739 }
3740 #endif
3741 }
3742
3743 if (IgnoreUnrecognizedVMOptions) {
3744 // uncast const to modify the flag args->ignoreUnrecognized
3745 *(jboolean*)(&args->ignoreUnrecognized) = true;
3746 }
3747
3748 // Parse specified settings file
3749 if (settings_file_specified) {
3750 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3751 return JNI_EINVAL;
3752 }
3753 } else {
3754 #ifdef ASSERT
3755 // Parse default .hotspotrc settings file
3756 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3757 return JNI_EINVAL;
3758 }
3759 #else
3760 struct stat buf;
3761 if (os::stat(hotspotrc, &buf) == 0) {
3762 needs_hotspotrc_warning = true;
3763 }
3764 #endif
3765 }
3766
3767 if (PrintVMOptions) {
3768 for (index = 0; index < args->nOptions; index++) {
3769 const JavaVMOption *option = args->options + index;
3770 if (match_option(option, "-XX:", &tail)) {
3771 logOption(tail);
3772 }
3773 }
3774 }
3775
3776 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3777 jint result = parse_vm_init_args(args);
3778 if (result != JNI_OK) {
3779 return result;
3780 }
3781
3782 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3783 SharedArchivePath = get_shared_archive_path();
3784 if (SharedArchivePath == NULL) {
3785 return JNI_ENOMEM;
3786 }
3787
3788 // Set up VerifySharedSpaces
3789 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3790 VerifySharedSpaces = true;
3791 }
3792
3793 // Delay warning until here so that we've had a chance to process
3794 // the -XX:-PrintWarnings flag
3795 if (needs_hotspotrc_warning) {
3796 warning("%s file is present but has been ignored. "
3797 "Run with -XX:Flags=%s to load the file.",
3798 hotspotrc, hotspotrc);
3799 }
3800
3801 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3802 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3803 #endif
3804
3805 ArgumentsExt::report_unsupported_options();
3806
3807 #ifndef PRODUCT
3808 if (TraceBytecodesAt != 0) {
3809 TraceBytecodes = true;
3810 }
3811 if (CountCompiledCalls) {
3812 if (UseCounterDecay) {
3813 warning("UseCounterDecay disabled because CountCalls is set");
3814 UseCounterDecay = false;
3815 }
3816 }
3817 #endif // PRODUCT
3818
3819 if (ScavengeRootsInCode == 0) {
3820 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3821 warning("forcing ScavengeRootsInCode non-zero");
3822 }
3823 ScavengeRootsInCode = 1;
3824 }
3825
3826 if (PrintGCDetails) {
3827 // Turn on -verbose:gc options as well
3828 PrintGC = true;
3829 }
3830
3831 // Set object alignment values.
3832 set_object_alignment();
3833
3834 #if !INCLUDE_ALL_GCS
3835 force_serial_gc();
3836 #endif // INCLUDE_ALL_GCS
3837 #if !INCLUDE_CDS
3838 if (DumpSharedSpaces || RequireSharedSpaces) {
3839 jio_fprintf(defaultStream::error_stream(),
3840 "Shared spaces are not supported in this VM\n");
3841 return JNI_ERR;
3842 }
3843 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3844 warning("Shared spaces are not supported in this VM");
3845 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3846 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3847 }
3848 no_shared_spaces("CDS Disabled");
3849 #endif // INCLUDE_CDS
3850
3851 return JNI_OK;
3852 }
3853
3854 jint Arguments::apply_ergo() {
3855
3856 // Set flags based on ergonomics.
3857 set_ergonomics_flags();
3858
3859 set_shared_spaces_flags();
3860
3861 // Check the GC selections again.
3862 if (!check_gc_consistency()) {
3863 return JNI_EINVAL;
3864 }
3865
3866 if (TieredCompilation) {
3867 set_tiered_flags();
3868 } else {
3869 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3870 if (CompilationPolicyChoice >= 2) {
3871 vm_exit_during_initialization(
3872 "Incompatible compilation policy selected", NULL);
3873 }
3874 // Scale CompileThreshold
3875 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
3876 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
3877 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
3878 }
3879 }
3880
3881 #ifdef COMPILER2
3882 #ifndef PRODUCT
3883 if (PrintIdealGraphLevel > 0) {
3884 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3885 }
3886 #endif
3887 #endif
3888
3889 // Set heap size based on available physical memory
3890 set_heap_size();
3891
3892 ArgumentsExt::set_gc_specific_flags();
3893
3894 // Initialize Metaspace flags and alignments
3895 Metaspace::ergo_initialize();
3896
3897 // Set bytecode rewriting flags
3898 set_bytecode_flags();
3899
3900 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3901 set_aggressive_opts_flags();
3902
3903 // Turn off biased locking for locking debug mode flags,
3904 // which are subtly different from each other but neither works with
3905 // biased locking
3906 if (UseHeavyMonitors
3907 #ifdef COMPILER1
3908 || !UseFastLocking
3909 #endif // COMPILER1
3910 ) {
3911 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3912 // flag set to true on command line; warn the user that they
3913 // can't enable biased locking here
3914 warning("Biased Locking is not supported with locking debug flags"
3915 "; ignoring UseBiasedLocking flag." );
3916 }
3917 UseBiasedLocking = false;
3918 }
3919
3920 #ifdef ZERO
3921 // Clear flags not supported on zero.
3922 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3923 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3924 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3925 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3926 #endif // CC_INTERP
3927
3928 #ifdef COMPILER2
3929 if (!EliminateLocks) {
3930 EliminateNestedLocks = false;
3931 }
3932 if (!Inline) {
3933 IncrementalInline = false;
3934 }
3935 #ifndef PRODUCT
3936 if (!IncrementalInline) {
3937 AlwaysIncrementalInline = false;
3938 }
3939 #endif
3940 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3941 // nothing to use the profiling, turn if off
3942 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3943 }
3944 #endif
3945
3946 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3947 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3948 DebugNonSafepoints = true;
3949 }
3950
3951 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3952 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3953 }
3954
3955 #ifndef PRODUCT
3956 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3957 if (use_vm_log()) {
3958 LogVMOutput = true;
3959 }
3960 }
3961 #endif // PRODUCT
3962
3963 if (PrintCommandLineFlags) {
3964 CommandLineFlags::printSetFlags(tty);
3965 }
3966
3967 // Apply CPU specific policy for the BiasedLocking
3968 if (UseBiasedLocking) {
3969 if (!VM_Version::use_biased_locking() &&
3970 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3971 UseBiasedLocking = false;
3972 }
3973 }
3974 #ifdef COMPILER2
3975 if (!UseBiasedLocking || EmitSync != 0) {
3976 UseOptoBiasInlining = false;
3977 }
3978 #endif
3979
3980 return JNI_OK;
3981 }
3982
3983 jint Arguments::adjust_after_os() {
3984 if (UseNUMA) {
3985 if (UseParallelGC || UseParallelOldGC) {
3986 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3987 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3988 }
3989 }
3990 // UseNUMAInterleaving is set to ON for all collectors and
3991 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3992 // such as the parallel collector for Linux and Solaris will
3993 // interleave old gen and survivor spaces on top of NUMA
3994 // allocation policy for the eden space.
3995 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3996 // all platforms and ParallelGC on Windows will interleave all
3997 // of the heap spaces across NUMA nodes.
3998 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3999 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4000 }
4001 }
4002 return JNI_OK;
4003 }
4004
4005 int Arguments::PropertyList_count(SystemProperty* pl) {
4006 int count = 0;
4007 while(pl != NULL) {
4008 count++;
4009 pl = pl->next();
4010 }
4011 return count;
4012 }
4013
4014 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4015 assert(key != NULL, "just checking");
4016 SystemProperty* prop;
4017 for (prop = pl; prop != NULL; prop = prop->next()) {
4018 if (strcmp(key, prop->key()) == 0) return prop->value();
4019 }
4020 return NULL;
4021 }
4022
4023 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4024 int count = 0;
4025 const char* ret_val = NULL;
4026
4027 while(pl != NULL) {
4028 if(count >= index) {
4029 ret_val = pl->key();
4030 break;
4031 }
4032 count++;
4033 pl = pl->next();
4034 }
4035
4036 return ret_val;
4037 }
4038
4039 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4040 int count = 0;
4041 char* ret_val = NULL;
4042
4043 while(pl != NULL) {
4044 if(count >= index) {
4045 ret_val = pl->value();
4046 break;
4047 }
4048 count++;
4049 pl = pl->next();
4050 }
4051
4052 return ret_val;
4053 }
4054
4055 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4056 SystemProperty* p = *plist;
4057 if (p == NULL) {
4058 *plist = new_p;
4059 } else {
4060 while (p->next() != NULL) {
4061 p = p->next();
4062 }
4063 p->set_next(new_p);
4064 }
4065 }
4066
4067 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4068 if (plist == NULL)
4069 return;
4070
4071 SystemProperty* new_p = new SystemProperty(k, v, true);
4072 PropertyList_add(plist, new_p);
4073 }
4074
4075 void Arguments::PropertyList_add(SystemProperty *element) {
4076 PropertyList_add(&_system_properties, element);
4077 }
4078
4079 // This add maintains unique property key in the list.
4080 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4081 if (plist == NULL)
4082 return;
4083
4084 // If property key exist then update with new value.
4085 SystemProperty* prop;
4086 for (prop = *plist; prop != NULL; prop = prop->next()) {
4087 if (strcmp(k, prop->key()) == 0) {
4088 if (append) {
4089 prop->append_value(v);
4090 } else {
4091 prop->set_value(v);
4092 }
4093 return;
4094 }
4095 }
4096
4097 PropertyList_add(plist, k, v);
4098 }
4099
4100 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4101 // Returns true if all of the source pointed by src has been copied over to
4102 // the destination buffer pointed by buf. Otherwise, returns false.
4103 // Notes:
4104 // 1. If the length (buflen) of the destination buffer excluding the
4105 // NULL terminator character is not long enough for holding the expanded
4106 // pid characters, it also returns false instead of returning the partially
4107 // expanded one.
4108 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4109 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4110 char* buf, size_t buflen) {
4111 const char* p = src;
4112 char* b = buf;
4113 const char* src_end = &src[srclen];
4114 char* buf_end = &buf[buflen - 1];
4115
4116 while (p < src_end && b < buf_end) {
4117 if (*p == '%') {
4118 switch (*(++p)) {
4119 case '%': // "%%" ==> "%"
4120 *b++ = *p++;
4121 break;
4122 case 'p': { // "%p" ==> current process id
4123 // buf_end points to the character before the last character so
4124 // that we could write '\0' to the end of the buffer.
4125 size_t buf_sz = buf_end - b + 1;
4126 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4127
4128 // if jio_snprintf fails or the buffer is not long enough to hold
4129 // the expanded pid, returns false.
4130 if (ret < 0 || ret >= (int)buf_sz) {
4131 return false;
4132 } else {
4133 b += ret;
4134 assert(*b == '\0', "fail in copy_expand_pid");
4135 if (p == src_end && b == buf_end + 1) {
4136 // reach the end of the buffer.
4137 return true;
4138 }
4139 }
4140 p++;
4141 break;
4142 }
4143 default :
4144 *b++ = '%';
4145 }
4146 } else {
4147 *b++ = *p++;
4148 }
4149 }
4150 *b = '\0';
4151 return (p == src_end); // return false if not all of the source was copied
4152 }