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 "gc/shared/cardTableRS.hpp"
32 #include "gc/shared/genCollectedHeap.hpp"
33 #include "gc/shared/referenceProcessor.hpp"
34 #include "gc/shared/taskqueue.hpp"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/universe.inline.hpp"
37 #include "oops/oop.inline.hpp"
38 #include "prims/jvmtiExport.hpp"
39 #include "runtime/arguments.hpp"
40 #include "runtime/arguments_ext.hpp"
41 #include "runtime/globals_extension.hpp"
42 #include "runtime/java.hpp"
43 #include "runtime/os.hpp"
44 #include "runtime/vm_version.hpp"
45 #include "services/management.hpp"
46 #include "services/memTracker.hpp"
47 #include "utilities/defaultStream.hpp"
48 #include "utilities/macros.hpp"
49 #include "utilities/stringUtils.hpp"
50 #if INCLUDE_ALL_GCS
51 #include "gc/cms/compactibleFreeListSpace.hpp"
52 #include "gc/g1/g1CollectedHeap.inline.hpp"
53 #include "gc/parallel/parallelScavengeHeap.hpp"
54 #endif // INCLUDE_ALL_GCS
55
56 // Note: This is a special bug reporting site for the JVM
57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
58 #define DEFAULT_JAVA_LAUNCHER "generic"
59
60 #define UNSUPPORTED_GC_OPTION(gc) \
61 do { \
62 if (gc) { \
63 if (FLAG_IS_CMDLINE(gc)) { \
64 warning(#gc " is not supported in this VM. Using Serial GC."); \
65 } \
66 FLAG_SET_DEFAULT(gc, false); \
67 } \
68 } while(0)
69
70 char** Arguments::_jvm_flags_array = NULL;
71 int Arguments::_num_jvm_flags = 0;
72 char** Arguments::_jvm_args_array = NULL;
73 int Arguments::_num_jvm_args = 0;
74 char* Arguments::_java_command = NULL;
75 SystemProperty* Arguments::_system_properties = NULL;
76 const char* Arguments::_gc_log_filename = NULL;
77 bool Arguments::_has_profile = false;
78 size_t Arguments::_conservative_max_heap_alignment = 0;
79 size_t Arguments::_min_heap_size = 0;
80 uintx Arguments::_min_heap_free_ratio = 0;
81 uintx Arguments::_max_heap_free_ratio = 0;
82 Arguments::Mode Arguments::_mode = _mixed;
83 bool Arguments::_java_compiler = false;
84 bool Arguments::_xdebug_mode = false;
85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
87 int Arguments::_sun_java_launcher_pid = -1;
88 bool Arguments::_sun_java_launcher_is_altjvm = false;
89
90 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
93 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
94 bool Arguments::_ClipInlining = ClipInlining;
95 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
96 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
97
98 char* Arguments::SharedArchivePath = NULL;
99
100 AgentLibraryList Arguments::_libraryList;
101 AgentLibraryList Arguments::_agentList;
102
103 abort_hook_t Arguments::_abort_hook = NULL;
104 exit_hook_t Arguments::_exit_hook = NULL;
105 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
106
107
108 SystemProperty *Arguments::_sun_boot_library_path = NULL;
109 SystemProperty *Arguments::_java_library_path = NULL;
110 SystemProperty *Arguments::_java_home = NULL;
111 SystemProperty *Arguments::_java_class_path = NULL;
112 SystemProperty *Arguments::_sun_boot_class_path = NULL;
113
114 char* Arguments::_ext_dirs = NULL;
115
116 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
117 // part of the option string.
118 static bool match_option(const JavaVMOption *option, const char* name,
119 const char** tail) {
120 int len = (int)strlen(name);
121 if (strncmp(option->optionString, name, len) == 0) {
122 *tail = option->optionString + len;
123 return true;
124 } else {
125 return false;
126 }
127 }
128
129 // Check if 'option' matches 'name'. No "tail" is allowed.
130 static bool match_option(const JavaVMOption *option, const char* name) {
131 const char* tail = NULL;
132 bool result = match_option(option, name, &tail);
133 if (tail != NULL && *tail == '\0') {
134 return result;
135 } else {
136 return false;
137 }
138 }
139
140 // Return true if any of the strings in null-terminated array 'names' matches.
141 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
142 // the option must match exactly.
143 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
144 bool tail_allowed) {
145 for (/* empty */; *names != NULL; ++names) {
146 if (match_option(option, *names, tail)) {
147 if (**tail == '\0' || tail_allowed && **tail == ':') {
148 return true;
149 }
150 }
151 }
152 return false;
153 }
154
155 static void logOption(const char* opt) {
156 if (PrintVMOptions) {
157 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
158 }
159 }
160
161 // Process java launcher properties.
162 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
163 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
164 // sun.java.launcher.pid is defined.
165 // Must do this before setting up other system properties,
166 // as some of them may depend on launcher type.
167 for (int index = 0; index < args->nOptions; index++) {
168 const JavaVMOption* option = args->options + index;
169 const char* tail;
170
171 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
172 process_java_launcher_argument(tail, option->extraInfo);
173 continue;
174 }
175 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
176 if (strcmp(tail, "true") == 0) {
177 _sun_java_launcher_is_altjvm = true;
178 }
179 continue;
180 }
181 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
182 _sun_java_launcher_pid = atoi(tail);
183 continue;
184 }
185 }
186 }
187
188 // Initialize system properties key and value.
189 void Arguments::init_system_properties() {
190
191 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
192 "Java Virtual Machine Specification", false));
193 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
194 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
195 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
196
197 // Following are JVMTI agent writable properties.
198 // Properties values are set to NULL and they are
199 // os specific they are initialized in os::init_system_properties_values().
200 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
201 _java_library_path = new SystemProperty("java.library.path", NULL, true);
202 _java_home = new SystemProperty("java.home", NULL, true);
203 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
204
205 _java_class_path = new SystemProperty("java.class.path", "", true);
206
207 // Add to System Property list.
208 PropertyList_add(&_system_properties, _sun_boot_library_path);
209 PropertyList_add(&_system_properties, _java_library_path);
210 PropertyList_add(&_system_properties, _java_home);
211 PropertyList_add(&_system_properties, _java_class_path);
212 PropertyList_add(&_system_properties, _sun_boot_class_path);
213
214 // Set OS specific system properties values
215 os::init_system_properties_values();
216 }
217
218
219 // Update/Initialize System properties after JDK version number is known
220 void Arguments::init_version_specific_system_properties() {
221 enum { bufsz = 16 };
222 char buffer[bufsz];
223 const char* spec_vendor = "Sun Microsystems Inc.";
224 uint32_t spec_version = 0;
225
226 spec_vendor = "Oracle Corporation";
227 spec_version = JDK_Version::current().major_version();
228 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
229
230 PropertyList_add(&_system_properties,
231 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.specification.version", buffer, false));
234 PropertyList_add(&_system_properties,
235 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
236 }
237
238 /**
239 * Provide a slightly more user-friendly way of eliminating -XX flags.
240 * When a flag is eliminated, it can be added to this list in order to
241 * continue accepting this flag on the command-line, while issuing a warning
242 * and ignoring the value. Once the JDK version reaches the 'accept_until'
243 * limit, we flatly refuse to admit the existence of the flag. This allows
244 * a flag to die correctly over JDK releases using HSX.
245 * But now that HSX is no longer supported only options with a future
246 * accept_until value need to be listed, and the list can be pruned
247 * on each major release.
248 */
249 typedef struct {
250 const char* name;
251 JDK_Version obsoleted_in; // when the flag went away
252 JDK_Version accept_until; // which version to start denying the existence
253 } ObsoleteFlag;
254
255 static ObsoleteFlag obsolete_jvm_flags[] = {
256 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
257 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
258 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
259 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
260 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
261 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
262 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
263 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
264 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
265 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
266 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
267 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
268 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
269 #ifndef ZERO
270 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
271 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
272 #endif // ZERO
273 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) },
274 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) },
275 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) },
276 { NULL, JDK_Version(0), JDK_Version(0) }
277 };
278
279 // Returns true if the flag is obsolete and fits into the range specified
280 // for being ignored. In the case that the flag is ignored, the 'version'
281 // value is filled in with the version number when the flag became
282 // obsolete so that that value can be displayed to the user.
283 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
284 int i = 0;
285 assert(version != NULL, "Must provide a version buffer");
286 while (obsolete_jvm_flags[i].name != NULL) {
287 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
288 // <flag>=xxx form
289 // [-|+]<flag> form
290 size_t len = strlen(flag_status.name);
291 if ((strncmp(flag_status.name, s, len) == 0) &&
292 (strlen(s) == len)){
293 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
294 *version = flag_status.obsoleted_in;
295 return true;
296 }
297 }
298 i++;
299 }
300 return false;
301 }
302
303 // Constructs the system class path (aka boot class path) from the following
304 // components, in order:
305 //
306 // prefix // from -Xbootclasspath/p:...
307 // base // from os::get_system_properties() or -Xbootclasspath=
308 // suffix // from -Xbootclasspath/a:...
309 //
310 // This could be AllStatic, but it isn't needed after argument processing is
311 // complete.
312 class SysClassPath: public StackObj {
313 public:
314 SysClassPath(const char* base);
315 ~SysClassPath();
316
317 inline void set_base(const char* base);
318 inline void add_prefix(const char* prefix);
319 inline void add_suffix_to_prefix(const char* suffix);
320 inline void add_suffix(const char* suffix);
321 inline void reset_path(const char* base);
322
323 inline const char* get_base() const { return _items[_scp_base]; }
324 inline const char* get_prefix() const { return _items[_scp_prefix]; }
325 inline const char* get_suffix() const { return _items[_scp_suffix]; }
326
327 // Combine all the components into a single c-heap-allocated string; caller
328 // must free the string if/when no longer needed.
329 char* combined_path();
330
331 private:
332 // Utility routines.
333 static char* add_to_path(const char* path, const char* str, bool prepend);
334 static char* add_jars_to_path(char* path, const char* directory);
335
336 inline void reset_item_at(int index);
337
338 // Array indices for the items that make up the sysclasspath. All except the
339 // base are allocated in the C heap and freed by this class.
340 enum {
341 _scp_prefix, // from -Xbootclasspath/p:...
342 _scp_base, // the default sysclasspath
343 _scp_suffix, // from -Xbootclasspath/a:...
344 _scp_nitems // the number of items, must be last.
345 };
346
347 const char* _items[_scp_nitems];
348 };
349
350 SysClassPath::SysClassPath(const char* base) {
351 memset(_items, 0, sizeof(_items));
352 _items[_scp_base] = base;
353 }
354
355 SysClassPath::~SysClassPath() {
356 // Free everything except the base.
357 for (int i = 0; i < _scp_nitems; ++i) {
358 if (i != _scp_base) reset_item_at(i);
359 }
360 }
361
362 inline void SysClassPath::set_base(const char* base) {
363 _items[_scp_base] = base;
364 }
365
366 inline void SysClassPath::add_prefix(const char* prefix) {
367 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
368 }
369
370 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
371 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
372 }
373
374 inline void SysClassPath::add_suffix(const char* suffix) {
375 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
376 }
377
378 inline void SysClassPath::reset_item_at(int index) {
379 assert(index < _scp_nitems && index != _scp_base, "just checking");
380 if (_items[index] != NULL) {
381 FREE_C_HEAP_ARRAY(char, _items[index]);
382 _items[index] = NULL;
383 }
384 }
385
386 inline void SysClassPath::reset_path(const char* base) {
387 // Clear the prefix and suffix.
388 reset_item_at(_scp_prefix);
389 reset_item_at(_scp_suffix);
390 set_base(base);
391 }
392
393 //------------------------------------------------------------------------------
394
395
396 // Combine the bootclasspath elements, some of which may be null, into a single
397 // c-heap-allocated string.
398 char* SysClassPath::combined_path() {
399 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
400
401 size_t lengths[_scp_nitems];
402 size_t total_len = 0;
403
404 const char separator = *os::path_separator();
405
406 // Get the lengths.
407 int i;
408 for (i = 0; i < _scp_nitems; ++i) {
409 if (_items[i] != NULL) {
410 lengths[i] = strlen(_items[i]);
411 // Include space for the separator char (or a NULL for the last item).
412 total_len += lengths[i] + 1;
413 }
414 }
415 assert(total_len > 0, "empty sysclasspath not allowed");
416
417 // Copy the _items to a single string.
418 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
419 char* cp_tmp = cp;
420 for (i = 0; i < _scp_nitems; ++i) {
421 if (_items[i] != NULL) {
422 memcpy(cp_tmp, _items[i], lengths[i]);
423 cp_tmp += lengths[i];
424 *cp_tmp++ = separator;
425 }
426 }
427 *--cp_tmp = '\0'; // Replace the extra separator.
428 return cp;
429 }
430
431 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
432 char*
433 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
434 char *cp;
435
436 assert(str != NULL, "just checking");
437 if (path == NULL) {
438 size_t len = strlen(str) + 1;
439 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
440 memcpy(cp, str, len); // copy the trailing null
441 } else {
442 const char separator = *os::path_separator();
443 size_t old_len = strlen(path);
444 size_t str_len = strlen(str);
445 size_t len = old_len + str_len + 2;
446
447 if (prepend) {
448 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
449 char* cp_tmp = cp;
450 memcpy(cp_tmp, str, str_len);
451 cp_tmp += str_len;
452 *cp_tmp = separator;
453 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
454 FREE_C_HEAP_ARRAY(char, path);
455 } else {
456 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
457 char* cp_tmp = cp + old_len;
458 *cp_tmp = separator;
459 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
460 }
461 }
462 return cp;
463 }
464
465 // Scan the directory and append any jar or zip files found to path.
466 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
467 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
468 DIR* dir = os::opendir(directory);
469 if (dir == NULL) return path;
470
471 char dir_sep[2] = { '\0', '\0' };
472 size_t directory_len = strlen(directory);
473 const char fileSep = *os::file_separator();
474 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
475
476 /* Scan the directory for jars/zips, appending them to path. */
477 struct dirent *entry;
478 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
479 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
480 const char* name = entry->d_name;
481 const char* ext = name + strlen(name) - 4;
482 bool isJarOrZip = ext > name &&
483 (os::file_name_strcmp(ext, ".jar") == 0 ||
484 os::file_name_strcmp(ext, ".zip") == 0);
485 if (isJarOrZip) {
486 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
487 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
488 path = add_to_path(path, jarpath, false);
489 FREE_C_HEAP_ARRAY(char, jarpath);
490 }
491 }
492 FREE_C_HEAP_ARRAY(char, dbuf);
493 os::closedir(dir);
494 return path;
495 }
496
497 // Parses a memory size specification string.
498 static bool atomull(const char *s, julong* result) {
499 julong n = 0;
500 int args_read = 0;
501 bool is_hex = false;
502 // Skip leading 0[xX] for hexadecimal
503 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
504 s += 2;
505 is_hex = true;
506 args_read = sscanf(s, JULONG_FORMAT_X, &n);
507 } else {
508 args_read = sscanf(s, JULONG_FORMAT, &n);
509 }
510 if (args_read != 1) {
511 return false;
512 }
513 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
514 s++;
515 }
516 // 4705540: illegal if more characters are found after the first non-digit
517 if (strlen(s) > 1) {
518 return false;
519 }
520 switch (*s) {
521 case 'T': case 't':
522 *result = n * G * K;
523 // Check for overflow.
524 if (*result/((julong)G * K) != n) return false;
525 return true;
526 case 'G': case 'g':
527 *result = n * G;
528 if (*result/G != n) return false;
529 return true;
530 case 'M': case 'm':
531 *result = n * M;
532 if (*result/M != n) return false;
533 return true;
534 case 'K': case 'k':
535 *result = n * K;
536 if (*result/K != n) return false;
537 return true;
538 case '\0':
539 *result = n;
540 return true;
541 default:
542 return false;
543 }
544 }
545
546 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
547 if (size < min_size) return arg_too_small;
548 // Check that size will fit in a size_t (only relevant on 32-bit)
549 if (size > max_uintx) return arg_too_big;
550 return arg_in_range;
551 }
552
553 // Describe an argument out of range error
554 void Arguments::describe_range_error(ArgsRange errcode) {
555 switch(errcode) {
556 case arg_too_big:
557 jio_fprintf(defaultStream::error_stream(),
558 "The specified size exceeds the maximum "
559 "representable size.\n");
560 break;
561 case arg_too_small:
562 case arg_unreadable:
563 case arg_in_range:
564 // do nothing for now
565 break;
566 default:
567 ShouldNotReachHere();
568 }
569 }
570
571 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
572 return CommandLineFlags::boolAtPut(name, &value, origin);
573 }
574
575 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
576 double v;
577 if (sscanf(value, "%lf", &v) != 1) {
578 return false;
579 }
580
581 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
582 return true;
583 }
584 return false;
585 }
586
587 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
588 julong v;
589 intx intx_v;
590 bool is_neg = false;
591 // Check the sign first since atomull() parses only unsigned values.
592 if (*value == '-') {
593 if (!CommandLineFlags::intxAt(name, &intx_v)) {
594 return false;
595 }
596 value++;
597 is_neg = true;
598 }
599 if (!atomull(value, &v)) {
600 return false;
601 }
602 intx_v = (intx) v;
603 if (is_neg) {
604 intx_v = -intx_v;
605 }
606 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
607 return true;
608 }
609 uintx uintx_v = (uintx) v;
610 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
611 return true;
612 }
613 uint64_t uint64_t_v = (uint64_t) v;
614 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
615 return true;
616 }
617 size_t size_t_v = (size_t) v;
618 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
619 return true;
620 }
621 return false;
622 }
623
624 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
625 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
626 // Contract: CommandLineFlags always returns a pointer that needs freeing.
627 FREE_C_HEAP_ARRAY(char, value);
628 return true;
629 }
630
631 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
632 const char* old_value = "";
633 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
634 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
635 size_t new_len = strlen(new_value);
636 const char* value;
637 char* free_this_too = NULL;
638 if (old_len == 0) {
639 value = new_value;
640 } else if (new_len == 0) {
641 value = old_value;
642 } else {
643 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
644 // each new setting adds another LINE to the switch:
645 sprintf(buf, "%s\n%s", old_value, new_value);
646 value = buf;
647 free_this_too = buf;
648 }
649 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
650 // CommandLineFlags always returns a pointer that needs freeing.
651 FREE_C_HEAP_ARRAY(char, value);
652 if (free_this_too != NULL) {
653 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
654 FREE_C_HEAP_ARRAY(char, free_this_too);
655 }
656 return true;
657 }
658
659 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
660
661 // range of acceptable characters spelled out for portability reasons
662 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
663 #define BUFLEN 255
664 char name[BUFLEN+1];
665 char dummy;
666
667 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
668 return set_bool_flag(name, false, origin);
669 }
670 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
671 return set_bool_flag(name, true, origin);
672 }
673
674 char punct;
675 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
676 const char* value = strchr(arg, '=') + 1;
677 Flag* flag = Flag::find_flag(name, strlen(name));
678 if (flag != NULL && flag->is_ccstr()) {
679 if (flag->ccstr_accumulates()) {
680 return append_to_string_flag(name, value, origin);
681 } else {
682 if (value[0] == '\0') {
683 value = NULL;
684 }
685 return set_string_flag(name, value, origin);
686 }
687 }
688 }
689
690 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
691 const char* value = strchr(arg, '=') + 1;
692 // -XX:Foo:=xxx will reset the string flag to the given value.
693 if (value[0] == '\0') {
694 value = NULL;
695 }
696 return set_string_flag(name, value, origin);
697 }
698
699 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
700 #define SIGNED_NUMBER_RANGE "[-0123456789]"
701 #define NUMBER_RANGE "[0123456789]"
702 char value[BUFLEN + 1];
703 char value2[BUFLEN + 1];
704 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
705 // Looks like a floating-point number -- try again with more lenient format string
706 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
707 return set_fp_numeric_flag(name, value, origin);
708 }
709 }
710
711 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
712 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
713 return set_numeric_flag(name, value, origin);
714 }
715
716 return false;
717 }
718
719 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
720 assert(bldarray != NULL, "illegal argument");
721
722 if (arg == NULL) {
723 return;
724 }
725
726 int new_count = *count + 1;
727
728 // expand the array and add arg to the last element
729 if (*bldarray == NULL) {
730 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
731 } else {
732 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
733 }
734 (*bldarray)[*count] = os::strdup_check_oom(arg);
735 *count = new_count;
736 }
737
738 void Arguments::build_jvm_args(const char* arg) {
739 add_string(&_jvm_args_array, &_num_jvm_args, arg);
740 }
741
742 void Arguments::build_jvm_flags(const char* arg) {
743 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
744 }
745
746 // utility function to return a string that concatenates all
747 // strings in a given char** array
748 const char* Arguments::build_resource_string(char** args, int count) {
749 if (args == NULL || count == 0) {
750 return NULL;
751 }
752 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
753 for (int i = 1; i < count; i++) {
754 length += strlen(args[i]) + 1; // add 1 for a space
755 }
756 char* s = NEW_RESOURCE_ARRAY(char, length);
757 strcpy(s, args[0]);
758 for (int j = 1; j < count; j++) {
759 strcat(s, " ");
760 strcat(s, args[j]);
761 }
762 return (const char*) s;
763 }
764
765 void Arguments::print_on(outputStream* st) {
766 st->print_cr("VM Arguments:");
767 if (num_jvm_flags() > 0) {
768 st->print("jvm_flags: "); print_jvm_flags_on(st);
769 }
770 if (num_jvm_args() > 0) {
771 st->print("jvm_args: "); print_jvm_args_on(st);
772 }
773 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
774 if (_java_class_path != NULL) {
775 char* path = _java_class_path->value();
776 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
777 }
778 st->print_cr("Launcher Type: %s", _sun_java_launcher);
779 }
780
781 void Arguments::print_jvm_flags_on(outputStream* st) {
782 if (_num_jvm_flags > 0) {
783 for (int i=0; i < _num_jvm_flags; i++) {
784 st->print("%s ", _jvm_flags_array[i]);
785 }
786 st->cr();
787 }
788 }
789
790 void Arguments::print_jvm_args_on(outputStream* st) {
791 if (_num_jvm_args > 0) {
792 for (int i=0; i < _num_jvm_args; i++) {
793 st->print("%s ", _jvm_args_array[i]);
794 }
795 st->cr();
796 }
797 }
798
799 bool Arguments::process_argument(const char* arg,
800 jboolean ignore_unrecognized, Flag::Flags origin) {
801
802 JDK_Version since = JDK_Version();
803
804 if (parse_argument(arg, origin) || ignore_unrecognized) {
805 return true;
806 }
807
808 // Determine if the flag has '+', '-', or '=' characters.
809 bool has_plus_minus = (*arg == '+' || *arg == '-');
810 const char* const argname = has_plus_minus ? arg + 1 : arg;
811
812 size_t arg_len;
813 const char* equal_sign = strchr(argname, '=');
814 if (equal_sign == NULL) {
815 arg_len = strlen(argname);
816 } else {
817 arg_len = equal_sign - argname;
818 }
819
820 // Construct a string which consists only of the argument name without '+', '-', or '='.
821 char stripped_argname[256];
822 strncpy(stripped_argname, argname, arg_len);
823 stripped_argname[arg_len] = '\0'; //strncpy doesn't null terminate.
824
825 if (is_newly_obsolete(stripped_argname, &since)) {
826 char version[256];
827 since.to_string(version, sizeof(version));
828 warning("ignoring option %s; support was removed in %s", stripped_argname, version);
829 return true;
830 }
831
832 // For locked flags, report a custom error message if available.
833 // Otherwise, report the standard unrecognized VM option.
834 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
835 if (found_flag != NULL) {
836 char locked_message_buf[BUFLEN];
837 found_flag->get_locked_message(locked_message_buf, BUFLEN);
838 if (strlen(locked_message_buf) == 0) {
839 if (found_flag->is_bool() && !has_plus_minus) {
840 jio_fprintf(defaultStream::error_stream(),
841 "Missing +/- setting for VM option '%s'\n", argname);
842 } else if (!found_flag->is_bool() && has_plus_minus) {
843 jio_fprintf(defaultStream::error_stream(),
844 "Unexpected +/- setting in VM option '%s'\n", argname);
845 } else {
846 jio_fprintf(defaultStream::error_stream(),
847 "Improperly specified VM option '%s'\n", argname);
848 }
849 } else {
850 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
851 }
852 } else {
853 jio_fprintf(defaultStream::error_stream(),
854 "Unrecognized VM option '%s'\n", argname);
855 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
856 if (fuzzy_matched != NULL) {
857 jio_fprintf(defaultStream::error_stream(),
858 "Did you mean '%s%s%s'? ",
859 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
860 fuzzy_matched->_name,
861 (fuzzy_matched->is_bool()) ? "" : "=<value>");
862 }
863 }
864
865 // allow for commandline "commenting out" options like -XX:#+Verbose
866 return arg[0] == '#';
867 }
868
869 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
870 FILE* stream = fopen(file_name, "rb");
871 if (stream == NULL) {
872 if (should_exist) {
873 jio_fprintf(defaultStream::error_stream(),
874 "Could not open settings file %s\n", file_name);
875 return false;
876 } else {
877 return true;
878 }
879 }
880
881 char token[1024];
882 int pos = 0;
883
884 bool in_white_space = true;
885 bool in_comment = false;
886 bool in_quote = false;
887 char quote_c = 0;
888 bool result = true;
889
890 int c = getc(stream);
891 while(c != EOF && pos < (int)(sizeof(token)-1)) {
892 if (in_white_space) {
893 if (in_comment) {
894 if (c == '\n') in_comment = false;
895 } else {
896 if (c == '#') in_comment = true;
897 else if (!isspace(c)) {
898 in_white_space = false;
899 token[pos++] = c;
900 }
901 }
902 } else {
903 if (c == '\n' || (!in_quote && isspace(c))) {
904 // token ends at newline, or at unquoted whitespace
905 // this allows a way to include spaces in string-valued options
906 token[pos] = '\0';
907 logOption(token);
908 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
909 build_jvm_flags(token);
910 pos = 0;
911 in_white_space = true;
912 in_quote = false;
913 } else if (!in_quote && (c == '\'' || c == '"')) {
914 in_quote = true;
915 quote_c = c;
916 } else if (in_quote && (c == quote_c)) {
917 in_quote = false;
918 } else {
919 token[pos++] = c;
920 }
921 }
922 c = getc(stream);
923 }
924 if (pos > 0) {
925 token[pos] = '\0';
926 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
927 build_jvm_flags(token);
928 }
929 fclose(stream);
930 return result;
931 }
932
933 //=============================================================================================================
934 // Parsing of properties (-D)
935
936 const char* Arguments::get_property(const char* key) {
937 return PropertyList_get_value(system_properties(), key);
938 }
939
940 bool Arguments::add_property(const char* prop) {
941 const char* eq = strchr(prop, '=');
942 char* key;
943 // ns must be static--its address may be stored in a SystemProperty object.
944 const static char ns[1] = {0};
945 char* value = (char *)ns;
946
947 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
948 key = AllocateHeap(key_len + 1, mtInternal);
949 strncpy(key, prop, key_len);
950 key[key_len] = '\0';
951
952 if (eq != NULL) {
953 size_t value_len = strlen(prop) - key_len - 1;
954 value = AllocateHeap(value_len + 1, mtInternal);
955 strncpy(value, &prop[key_len + 1], value_len + 1);
956 }
957
958 if (strcmp(key, "java.compiler") == 0) {
959 process_java_compiler_argument(value);
960 FreeHeap(key);
961 if (eq != NULL) {
962 FreeHeap(value);
963 }
964 return true;
965 } else if (strcmp(key, "sun.java.command") == 0) {
966 _java_command = value;
967
968 // Record value in Arguments, but let it get passed to Java.
969 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
970 strcmp(key, "sun.java.launcher.pid") == 0) {
971 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
972 // private and are processed in process_sun_java_launcher_properties();
973 // the sun.java.launcher property is passed on to the java application
974 FreeHeap(key);
975 if (eq != NULL) {
976 FreeHeap(value);
977 }
978 return true;
979 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
980 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
981 // its value without going through the property list or making a Java call.
982 _java_vendor_url_bug = value;
983 } else if (strcmp(key, "sun.boot.library.path") == 0) {
984 PropertyList_unique_add(&_system_properties, key, value, true);
985 return true;
986 }
987 // Create new property and add at the end of the list
988 PropertyList_unique_add(&_system_properties, key, value);
989 return true;
990 }
991
992 //===========================================================================================================
993 // Setting int/mixed/comp mode flags
994
995 void Arguments::set_mode_flags(Mode mode) {
996 // Set up default values for all flags.
997 // If you add a flag to any of the branches below,
998 // add a default value for it here.
999 set_java_compiler(false);
1000 _mode = mode;
1001
1002 // Ensure Agent_OnLoad has the correct initial values.
1003 // This may not be the final mode; mode may change later in onload phase.
1004 PropertyList_unique_add(&_system_properties, "java.vm.info",
1005 (char*)VM_Version::vm_info_string(), false);
1006
1007 UseInterpreter = true;
1008 UseCompiler = true;
1009 UseLoopCounter = true;
1010
1011 // Default values may be platform/compiler dependent -
1012 // use the saved values
1013 ClipInlining = Arguments::_ClipInlining;
1014 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1015 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1016 BackgroundCompilation = Arguments::_BackgroundCompilation;
1017 if (TieredCompilation) {
1018 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1019 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1020 }
1021 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1022 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1023 }
1024 }
1025
1026 // Change from defaults based on mode
1027 switch (mode) {
1028 default:
1029 ShouldNotReachHere();
1030 break;
1031 case _int:
1032 UseCompiler = false;
1033 UseLoopCounter = false;
1034 AlwaysCompileLoopMethods = false;
1035 UseOnStackReplacement = false;
1036 break;
1037 case _mixed:
1038 // same as default
1039 break;
1040 case _comp:
1041 UseInterpreter = false;
1042 BackgroundCompilation = false;
1043 ClipInlining = false;
1044 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1045 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1046 // compile a level 4 (C2) and then continue executing it.
1047 if (TieredCompilation) {
1048 Tier3InvokeNotifyFreqLog = 0;
1049 Tier4InvocationThreshold = 0;
1050 }
1051 break;
1052 }
1053 }
1054
1055 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1056 // Conflict: required to use shared spaces (-Xshare:on), but
1057 // incompatible command line options were chosen.
1058
1059 static void no_shared_spaces(const char* message) {
1060 if (RequireSharedSpaces) {
1061 jio_fprintf(defaultStream::error_stream(),
1062 "Class data sharing is inconsistent with other specified options.\n");
1063 vm_exit_during_initialization("Unable to use shared archive.", message);
1064 } else {
1065 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1066 }
1067 }
1068 #endif
1069
1070 // Returns threshold scaled with the value of scale.
1071 // If scale < 0.0, threshold is returned without scaling.
1072 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1073 if (scale == 1.0 || scale < 0.0) {
1074 return threshold;
1075 } else {
1076 return (intx)(threshold * scale);
1077 }
1078 }
1079
1080 // Returns freq_log scaled with the value of scale.
1081 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1082 // If scale < 0.0, freq_log is returned without scaling.
1083 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1084 // Check if scaling is necessary or if negative value was specified.
1085 if (scale == 1.0 || scale < 0.0) {
1086 return freq_log;
1087 }
1088 // Check values to avoid calculating log2 of 0.
1089 if (scale == 0.0 || freq_log == 0) {
1090 return 0;
1091 }
1092 // Determine the maximum notification frequency value currently supported.
1093 // The largest mask value that the interpreter/C1 can handle is
1094 // of length InvocationCounter::number_of_count_bits. Mask values are always
1095 // one bit shorter then the value of the notification frequency. Set
1096 // max_freq_bits accordingly.
1097 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1098 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1099 if (scaled_freq == 0) {
1100 // Return 0 right away to avoid calculating log2 of 0.
1101 return 0;
1102 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1103 return max_freq_bits;
1104 } else {
1105 return log2_intptr(scaled_freq);
1106 }
1107 }
1108
1109 void Arguments::set_tiered_flags() {
1110 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1111 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1112 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1113 }
1114 if (CompilationPolicyChoice < 2) {
1115 vm_exit_during_initialization(
1116 "Incompatible compilation policy selected", NULL);
1117 }
1118 // Increase the code cache size - tiered compiles a lot more.
1119 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1120 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1121 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1122 }
1123 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1124 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1125 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1126
1127 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1128 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1129 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1130 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1131 }
1132 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1133 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1134 }
1135 // Check consistency of code heap sizes
1136 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1137 jio_fprintf(defaultStream::error_stream(),
1138 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1139 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1140 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1141 vm_exit(1);
1142 }
1143 }
1144 }
1145 if (!UseInterpreter) { // -Xcomp
1146 Tier3InvokeNotifyFreqLog = 0;
1147 Tier4InvocationThreshold = 0;
1148 }
1149
1150 if (CompileThresholdScaling < 0) {
1151 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1152 }
1153
1154 // Scale tiered compilation thresholds.
1155 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1156 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1157 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1158 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1159
1160 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1161 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1162 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1163 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1164
1165 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1166 // once these thresholds become supported.
1167
1168 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1169 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1170
1171 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1172 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1173
1174 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1175
1176 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1177 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1178 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1179 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1180 }
1181 }
1182
1183 /**
1184 * Returns the minimum number of compiler threads needed to run the JVM. The following
1185 * configurations are possible.
1186 *
1187 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1188 * compiler threads is 0.
1189 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1190 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1191 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1192 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1193 * C1 can be used, so the minimum number of compiler threads is 1.
1194 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1195 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1196 * the minimum number of compiler threads is 2.
1197 */
1198 int Arguments::get_min_number_of_compiler_threads() {
1199 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1200 return 0; // case 1
1201 #else
1202 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1203 return 1; // case 2 or case 3
1204 }
1205 return 2; // case 4 (tiered)
1206 #endif
1207 }
1208
1209 #if INCLUDE_ALL_GCS
1210 static void disable_adaptive_size_policy(const char* collector_name) {
1211 if (UseAdaptiveSizePolicy) {
1212 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1213 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1214 collector_name);
1215 }
1216 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1217 }
1218 }
1219
1220 void Arguments::set_parnew_gc_flags() {
1221 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1222 "control point invariant");
1223 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1224 assert(UseParNewGC, "ParNew should always be used with CMS");
1225
1226 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1227 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1228 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1229 } else if (ParallelGCThreads == 0) {
1230 jio_fprintf(defaultStream::error_stream(),
1231 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1232 vm_exit(1);
1233 }
1234
1235 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1236 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1237 // we set them to 1024 and 1024.
1238 // See CR 6362902.
1239 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1240 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1241 }
1242 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1243 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1244 }
1245
1246 // When using compressed oops, we use local overflow stacks,
1247 // rather than using a global overflow list chained through
1248 // the klass word of the object's pre-image.
1249 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1250 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1251 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1252 }
1253 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1254 }
1255 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1256 }
1257
1258 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1259 // sparc/solaris for certain applications, but would gain from
1260 // further optimization and tuning efforts, and would almost
1261 // certainly gain from analysis of platform and environment.
1262 void Arguments::set_cms_and_parnew_gc_flags() {
1263 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1264 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1265 assert(UseParNewGC, "ParNew should always be used with CMS");
1266
1267 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1268 disable_adaptive_size_policy("UseConcMarkSweepGC");
1269
1270 set_parnew_gc_flags();
1271
1272 size_t max_heap = align_size_down(MaxHeapSize,
1273 CardTableRS::ct_max_alignment_constraint());
1274
1275 // Now make adjustments for CMS
1276 intx tenuring_default = (intx)6;
1277 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1278
1279 // Preferred young gen size for "short" pauses:
1280 // upper bound depends on # of threads and NewRatio.
1281 const uintx parallel_gc_threads =
1282 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1283 const size_t preferred_max_new_size_unaligned =
1284 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1285 size_t preferred_max_new_size =
1286 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1287
1288 // Unless explicitly requested otherwise, size young gen
1289 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1290
1291 // If either MaxNewSize or NewRatio is set on the command line,
1292 // assume the user is trying to set the size of the young gen.
1293 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1294
1295 // Set MaxNewSize to our calculated preferred_max_new_size unless
1296 // NewSize was set on the command line and it is larger than
1297 // preferred_max_new_size.
1298 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1299 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1300 } else {
1301 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1302 }
1303 if (PrintGCDetails && Verbose) {
1304 // Too early to use gclog_or_tty
1305 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1306 }
1307
1308 // Code along this path potentially sets NewSize and OldSize
1309 if (PrintGCDetails && Verbose) {
1310 // Too early to use gclog_or_tty
1311 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1312 " initial_heap_size: " SIZE_FORMAT
1313 " max_heap: " SIZE_FORMAT,
1314 min_heap_size(), InitialHeapSize, max_heap);
1315 }
1316 size_t min_new = preferred_max_new_size;
1317 if (FLAG_IS_CMDLINE(NewSize)) {
1318 min_new = NewSize;
1319 }
1320 if (max_heap > min_new && min_heap_size() > min_new) {
1321 // Unless explicitly requested otherwise, make young gen
1322 // at least min_new, and at most preferred_max_new_size.
1323 if (FLAG_IS_DEFAULT(NewSize)) {
1324 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1325 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1326 if (PrintGCDetails && Verbose) {
1327 // Too early to use gclog_or_tty
1328 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1329 }
1330 }
1331 // Unless explicitly requested otherwise, size old gen
1332 // so it's NewRatio x of NewSize.
1333 if (FLAG_IS_DEFAULT(OldSize)) {
1334 if (max_heap > NewSize) {
1335 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1336 if (PrintGCDetails && Verbose) {
1337 // Too early to use gclog_or_tty
1338 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1339 }
1340 }
1341 }
1342 }
1343 }
1344 // Unless explicitly requested otherwise, definitely
1345 // promote all objects surviving "tenuring_default" scavenges.
1346 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1347 FLAG_IS_DEFAULT(SurvivorRatio)) {
1348 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1349 }
1350 // If we decided above (or user explicitly requested)
1351 // `promote all' (via MaxTenuringThreshold := 0),
1352 // prefer minuscule survivor spaces so as not to waste
1353 // space for (non-existent) survivors
1354 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1355 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1356 }
1357
1358 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1359 // but rather the number of free blocks of a given size that are used when
1360 // replenishing the local per-worker free list caches.
1361 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1362 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1363 // OldPLAB sizing manually turned off: Use a larger default setting,
1364 // unless it was manually specified. This is because a too-low value
1365 // will slow down scavenges.
1366 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1367 } else {
1368 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1369 }
1370 }
1371
1372 // If either of the static initialization defaults have changed, note this
1373 // modification.
1374 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1375 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1376 }
1377 if (PrintGCDetails && Verbose) {
1378 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1379 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1380 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1381 }
1382 }
1383 #endif // INCLUDE_ALL_GCS
1384
1385 void set_object_alignment() {
1386 // Object alignment.
1387 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1388 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1389 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1390 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1391 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1392 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1393
1394 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1395 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1396
1397 // Oop encoding heap max
1398 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1399
1400 #if INCLUDE_ALL_GCS
1401 // Set CMS global values
1402 CompactibleFreeListSpace::set_cms_values();
1403 #endif // INCLUDE_ALL_GCS
1404 }
1405
1406 bool verify_object_alignment() {
1407 // Object alignment.
1408 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1409 jio_fprintf(defaultStream::error_stream(),
1410 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1411 (int)ObjectAlignmentInBytes);
1412 return false;
1413 }
1414 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1415 jio_fprintf(defaultStream::error_stream(),
1416 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1417 (int)ObjectAlignmentInBytes, BytesPerLong);
1418 return false;
1419 }
1420 // It does not make sense to have big object alignment
1421 // since a space lost due to alignment will be greater
1422 // then a saved space from compressed oops.
1423 if ((int)ObjectAlignmentInBytes > 256) {
1424 jio_fprintf(defaultStream::error_stream(),
1425 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1426 (int)ObjectAlignmentInBytes);
1427 return false;
1428 }
1429 // In case page size is very small.
1430 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1431 jio_fprintf(defaultStream::error_stream(),
1432 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1433 (int)ObjectAlignmentInBytes, os::vm_page_size());
1434 return false;
1435 }
1436 if(SurvivorAlignmentInBytes == 0) {
1437 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1438 } else {
1439 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1440 jio_fprintf(defaultStream::error_stream(),
1441 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1442 (int)SurvivorAlignmentInBytes);
1443 return false;
1444 }
1445 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1446 jio_fprintf(defaultStream::error_stream(),
1447 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1448 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1449 return false;
1450 }
1451 }
1452 return true;
1453 }
1454
1455 size_t Arguments::max_heap_for_compressed_oops() {
1456 // Avoid sign flip.
1457 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1458 // We need to fit both the NULL page and the heap into the memory budget, while
1459 // keeping alignment constraints of the heap. To guarantee the latter, as the
1460 // NULL page is located before the heap, we pad the NULL page to the conservative
1461 // maximum alignment that the GC may ever impose upon the heap.
1462 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1463 _conservative_max_heap_alignment);
1464
1465 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1466 NOT_LP64(ShouldNotReachHere(); return 0);
1467 }
1468
1469 bool Arguments::should_auto_select_low_pause_collector() {
1470 if (UseAutoGCSelectPolicy &&
1471 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1472 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1473 if (PrintGCDetails) {
1474 // Cannot use gclog_or_tty yet.
1475 tty->print_cr("Automatic selection of the low pause collector"
1476 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1477 }
1478 return true;
1479 }
1480 return false;
1481 }
1482
1483 void Arguments::set_use_compressed_oops() {
1484 #ifndef ZERO
1485 #ifdef _LP64
1486 // MaxHeapSize is not set up properly at this point, but
1487 // the only value that can override MaxHeapSize if we are
1488 // to use UseCompressedOops is InitialHeapSize.
1489 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1490
1491 if (max_heap_size <= max_heap_for_compressed_oops()) {
1492 #if !defined(COMPILER1) || defined(TIERED)
1493 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1494 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1495 }
1496 #endif
1497 } else {
1498 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1499 warning("Max heap size too large for Compressed Oops");
1500 FLAG_SET_DEFAULT(UseCompressedOops, false);
1501 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1502 }
1503 }
1504 #endif // _LP64
1505 #endif // ZERO
1506 }
1507
1508
1509 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1510 // set_use_compressed_oops().
1511 void Arguments::set_use_compressed_klass_ptrs() {
1512 #ifndef ZERO
1513 #ifdef _LP64
1514 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1515 if (!UseCompressedOops) {
1516 if (UseCompressedClassPointers) {
1517 warning("UseCompressedClassPointers requires UseCompressedOops");
1518 }
1519 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1520 } else {
1521 // Turn on UseCompressedClassPointers too
1522 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1523 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1524 }
1525 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1526 if (UseCompressedClassPointers) {
1527 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1528 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1529 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1530 }
1531 }
1532 }
1533 #endif // _LP64
1534 #endif // !ZERO
1535 }
1536
1537 void Arguments::set_conservative_max_heap_alignment() {
1538 // The conservative maximum required alignment for the heap is the maximum of
1539 // the alignments imposed by several sources: any requirements from the heap
1540 // itself, the collector policy and the maximum page size we may run the VM
1541 // with.
1542 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1543 #if INCLUDE_ALL_GCS
1544 if (UseParallelGC) {
1545 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1546 } else if (UseG1GC) {
1547 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1548 }
1549 #endif // INCLUDE_ALL_GCS
1550 _conservative_max_heap_alignment = MAX4(heap_alignment,
1551 (size_t)os::vm_allocation_granularity(),
1552 os::max_page_size(),
1553 CollectorPolicy::compute_heap_alignment());
1554 }
1555
1556 void Arguments::select_gc_ergonomically() {
1557 if (os::is_server_class_machine()) {
1558 if (should_auto_select_low_pause_collector()) {
1559 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1560 } else {
1561 FLAG_SET_ERGO(bool, UseParallelGC, true);
1562 }
1563 } else {
1564 FLAG_SET_ERGO(bool, UseSerialGC, true);
1565 }
1566 }
1567
1568 void Arguments::select_gc() {
1569 if (!gc_selected()) {
1570 select_gc_ergonomically();
1571 guarantee(gc_selected(), "No GC selected");
1572 }
1573 }
1574
1575 void Arguments::set_ergonomics_flags() {
1576 select_gc();
1577
1578 #ifdef COMPILER2
1579 // Shared spaces work fine with other GCs but causes bytecode rewriting
1580 // to be disabled, which hurts interpreter performance and decreases
1581 // server performance. When -server is specified, keep the default off
1582 // unless it is asked for. Future work: either add bytecode rewriting
1583 // at link time, or rewrite bytecodes in non-shared methods.
1584 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1585 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1586 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1587 }
1588 #endif
1589
1590 set_conservative_max_heap_alignment();
1591
1592 #ifndef ZERO
1593 #ifdef _LP64
1594 set_use_compressed_oops();
1595
1596 // set_use_compressed_klass_ptrs() must be called after calling
1597 // set_use_compressed_oops().
1598 set_use_compressed_klass_ptrs();
1599
1600 // Also checks that certain machines are slower with compressed oops
1601 // in vm_version initialization code.
1602 #endif // _LP64
1603 #endif // !ZERO
1604 }
1605
1606 void Arguments::set_parallel_gc_flags() {
1607 assert(UseParallelGC || UseParallelOldGC, "Error");
1608 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1609 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1610 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1611 }
1612 FLAG_SET_DEFAULT(UseParallelGC, true);
1613
1614 // If no heap maximum was requested explicitly, use some reasonable fraction
1615 // of the physical memory, up to a maximum of 1GB.
1616 FLAG_SET_DEFAULT(ParallelGCThreads,
1617 Abstract_VM_Version::parallel_worker_threads());
1618 if (ParallelGCThreads == 0) {
1619 jio_fprintf(defaultStream::error_stream(),
1620 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1621 vm_exit(1);
1622 }
1623
1624 if (UseAdaptiveSizePolicy) {
1625 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1626 // unless the user actually sets these flags.
1627 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1628 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1629 _min_heap_free_ratio = MinHeapFreeRatio;
1630 }
1631 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1632 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1633 _max_heap_free_ratio = MaxHeapFreeRatio;
1634 }
1635 }
1636
1637 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1638 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1639 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1640 // See CR 6362902 for details.
1641 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1642 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1643 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1644 }
1645 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1646 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1647 }
1648 }
1649
1650 if (UseParallelOldGC) {
1651 // Par compact uses lower default values since they are treated as
1652 // minimums. These are different defaults because of the different
1653 // interpretation and are not ergonomically set.
1654 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1655 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1656 }
1657 }
1658 }
1659
1660 void Arguments::set_g1_gc_flags() {
1661 assert(UseG1GC, "Error");
1662 #ifdef COMPILER1
1663 FastTLABRefill = false;
1664 #endif
1665 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1666 if (ParallelGCThreads == 0) {
1667 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1668 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1669 }
1670
1671 #if INCLUDE_ALL_GCS
1672 if (G1ConcRefinementThreads == 0) {
1673 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1674 }
1675 #endif
1676
1677 // MarkStackSize will be set (if it hasn't been set by the user)
1678 // when concurrent marking is initialized.
1679 // Its value will be based upon the number of parallel marking threads.
1680 // But we do set the maximum mark stack size here.
1681 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1682 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1683 }
1684
1685 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1686 // In G1, we want the default GC overhead goal to be higher than
1687 // say in PS. So we set it here to 10%. Otherwise the heap might
1688 // be expanded more aggressively than we would like it to. In
1689 // fact, even 10% seems to not be high enough in some cases
1690 // (especially small GC stress tests that the main thing they do
1691 // is allocation). We might consider increase it further.
1692 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1693 }
1694
1695 if (PrintGCDetails && Verbose) {
1696 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1697 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1698 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1699 }
1700 }
1701
1702 #if !INCLUDE_ALL_GCS
1703 #ifdef ASSERT
1704 static bool verify_serial_gc_flags() {
1705 return (UseSerialGC &&
1706 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1707 UseParallelGC || UseParallelOldGC));
1708 }
1709 #endif // ASSERT
1710 #endif // INCLUDE_ALL_GCS
1711
1712 void Arguments::set_gc_specific_flags() {
1713 #if INCLUDE_ALL_GCS
1714 // Set per-collector flags
1715 if (UseParallelGC || UseParallelOldGC) {
1716 set_parallel_gc_flags();
1717 } else if (UseConcMarkSweepGC) {
1718 set_cms_and_parnew_gc_flags();
1719 } else if (UseG1GC) {
1720 set_g1_gc_flags();
1721 }
1722 check_deprecated_gc_flags();
1723 if (AssumeMP && !UseSerialGC) {
1724 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1725 warning("If the number of processors is expected to increase from one, then"
1726 " you should configure the number of parallel GC threads appropriately"
1727 " using -XX:ParallelGCThreads=N");
1728 }
1729 }
1730 if (MinHeapFreeRatio == 100) {
1731 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1732 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1733 }
1734 #else // INCLUDE_ALL_GCS
1735 assert(verify_serial_gc_flags(), "SerialGC unset");
1736 #endif // INCLUDE_ALL_GCS
1737 }
1738
1739 julong Arguments::limit_by_allocatable_memory(julong limit) {
1740 julong max_allocatable;
1741 julong result = limit;
1742 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1743 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1744 }
1745 return result;
1746 }
1747
1748 // Use static initialization to get the default before parsing
1749 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1750
1751 void Arguments::set_heap_size() {
1752 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1753 // Deprecated flag
1754 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1755 }
1756
1757 const julong phys_mem =
1758 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1759 : (julong)MaxRAM;
1760
1761 // If the maximum heap size has not been set with -Xmx,
1762 // then set it as fraction of the size of physical memory,
1763 // respecting the maximum and minimum sizes of the heap.
1764 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1765 julong reasonable_max = phys_mem / MaxRAMFraction;
1766
1767 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1768 // Small physical memory, so use a minimum fraction of it for the heap
1769 reasonable_max = phys_mem / MinRAMFraction;
1770 } else {
1771 // Not-small physical memory, so require a heap at least
1772 // as large as MaxHeapSize
1773 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1774 }
1775 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1776 // Limit the heap size to ErgoHeapSizeLimit
1777 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1778 }
1779 if (UseCompressedOops) {
1780 // Limit the heap size to the maximum possible when using compressed oops
1781 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1782
1783 // HeapBaseMinAddress can be greater than default but not less than.
1784 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1785 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1786 // matches compressed oops printing flags
1787 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1788 jio_fprintf(defaultStream::error_stream(),
1789 "HeapBaseMinAddress must be at least " SIZE_FORMAT
1790 " (" SIZE_FORMAT "G) which is greater than value given "
1791 SIZE_FORMAT "\n",
1792 DefaultHeapBaseMinAddress,
1793 DefaultHeapBaseMinAddress/G,
1794 HeapBaseMinAddress);
1795 }
1796 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1797 }
1798 }
1799
1800 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1801 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1802 // but it should be not less than default MaxHeapSize.
1803 max_coop_heap -= HeapBaseMinAddress;
1804 }
1805 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1806 }
1807 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1808
1809 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1810 // An initial heap size was specified on the command line,
1811 // so be sure that the maximum size is consistent. Done
1812 // after call to limit_by_allocatable_memory because that
1813 // method might reduce the allocation size.
1814 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1815 }
1816
1817 if (PrintGCDetails && Verbose) {
1818 // Cannot use gclog_or_tty yet.
1819 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1820 }
1821 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1822 }
1823
1824 // If the minimum or initial heap_size have not been set or requested to be set
1825 // ergonomically, set them accordingly.
1826 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1827 julong reasonable_minimum = (julong)(OldSize + NewSize);
1828
1829 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1830
1831 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1832
1833 if (InitialHeapSize == 0) {
1834 julong reasonable_initial = phys_mem / InitialRAMFraction;
1835
1836 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1837 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1838
1839 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1840
1841 if (PrintGCDetails && Verbose) {
1842 // Cannot use gclog_or_tty yet.
1843 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1844 }
1845 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1846 }
1847 // If the minimum heap size has not been set (via -Xms),
1848 // synchronize with InitialHeapSize to avoid errors with the default value.
1849 if (min_heap_size() == 0) {
1850 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1851 if (PrintGCDetails && Verbose) {
1852 // Cannot use gclog_or_tty yet.
1853 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1854 }
1855 }
1856 }
1857 }
1858
1859 // This must be called after ergonomics.
1860 void Arguments::set_bytecode_flags() {
1861 if (!RewriteBytecodes) {
1862 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1863 }
1864 }
1865
1866 // Aggressive optimization flags -XX:+AggressiveOpts
1867 void Arguments::set_aggressive_opts_flags() {
1868 #ifdef COMPILER2
1869 if (AggressiveUnboxing) {
1870 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1871 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1872 } else if (!EliminateAutoBox) {
1873 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1874 AggressiveUnboxing = false;
1875 }
1876 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1877 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1878 } else if (!DoEscapeAnalysis) {
1879 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1880 AggressiveUnboxing = false;
1881 }
1882 }
1883 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1884 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1885 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1886 }
1887 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1888 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1889 }
1890
1891 // Feed the cache size setting into the JDK
1892 char buffer[1024];
1893 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1894 add_property(buffer);
1895 }
1896 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1897 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1898 }
1899 #endif
1900
1901 if (AggressiveOpts) {
1902 // Sample flag setting code
1903 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1904 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1905 // }
1906 }
1907 }
1908
1909 //===========================================================================================================
1910 // Parsing of java.compiler property
1911
1912 void Arguments::process_java_compiler_argument(char* arg) {
1913 // For backwards compatibility, Djava.compiler=NONE or ""
1914 // causes us to switch to -Xint mode UNLESS -Xdebug
1915 // is also specified.
1916 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1917 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1918 }
1919 }
1920
1921 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1922 _sun_java_launcher = os::strdup_check_oom(launcher);
1923 }
1924
1925 bool Arguments::created_by_java_launcher() {
1926 assert(_sun_java_launcher != NULL, "property must have value");
1927 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1928 }
1929
1930 bool Arguments::sun_java_launcher_is_altjvm() {
1931 return _sun_java_launcher_is_altjvm;
1932 }
1933
1934 //===========================================================================================================
1935 // Parsing of main arguments
1936
1937 bool Arguments::verify_interval(uintx val, uintx min,
1938 uintx max, const char* name) {
1939 // Returns true iff value is in the inclusive interval [min..max]
1940 // false, otherwise.
1941 if (val >= min && val <= max) {
1942 return true;
1943 }
1944 jio_fprintf(defaultStream::error_stream(),
1945 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1946 " and " UINTX_FORMAT "\n",
1947 name, val, min, max);
1948 return false;
1949 }
1950
1951 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1952 // Returns true if given value is at least specified min threshold
1953 // false, otherwise.
1954 if (val >= min ) {
1955 return true;
1956 }
1957 jio_fprintf(defaultStream::error_stream(),
1958 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1959 name, val, min);
1960 return false;
1961 }
1962
1963 bool Arguments::verify_percentage(uintx value, const char* name) {
1964 if (is_percentage(value)) {
1965 return true;
1966 }
1967 jio_fprintf(defaultStream::error_stream(),
1968 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1969 name, value);
1970 return false;
1971 }
1972
1973 // check if do gclog rotation
1974 // +UseGCLogFileRotation is a must,
1975 // no gc log rotation when log file not supplied or
1976 // NumberOfGCLogFiles is 0
1977 void check_gclog_consistency() {
1978 if (UseGCLogFileRotation) {
1979 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1980 jio_fprintf(defaultStream::output_stream(),
1981 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1982 "where num_of_file > 0\n"
1983 "GC log rotation is turned off\n");
1984 UseGCLogFileRotation = false;
1985 }
1986 }
1987
1988 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1989 FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K);
1990 jio_fprintf(defaultStream::output_stream(),
1991 "GCLogFileSize changed to minimum 8K\n");
1992 }
1993 }
1994
1995 // This function is called for -Xloggc:<filename>, it can be used
1996 // to check if a given file name(or string) conforms to the following
1997 // specification:
1998 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1999 // %p and %t only allowed once. We only limit usage of filename not path
2000 bool is_filename_valid(const char *file_name) {
2001 const char* p = file_name;
2002 char file_sep = os::file_separator()[0];
2003 const char* cp;
2004 // skip prefix path
2005 for (cp = file_name; *cp != '\0'; cp++) {
2006 if (*cp == '/' || *cp == file_sep) {
2007 p = cp + 1;
2008 }
2009 }
2010
2011 int count_p = 0;
2012 int count_t = 0;
2013 while (*p != '\0') {
2014 if ((*p >= '0' && *p <= '9') ||
2015 (*p >= 'A' && *p <= 'Z') ||
2016 (*p >= 'a' && *p <= 'z') ||
2017 *p == '-' ||
2018 *p == '_' ||
2019 *p == '.') {
2020 p++;
2021 continue;
2022 }
2023 if (*p == '%') {
2024 if(*(p + 1) == 'p') {
2025 p += 2;
2026 count_p ++;
2027 continue;
2028 }
2029 if (*(p + 1) == 't') {
2030 p += 2;
2031 count_t ++;
2032 continue;
2033 }
2034 }
2035 return false;
2036 }
2037 return count_p < 2 && count_t < 2;
2038 }
2039
2040 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2041 if (!is_percentage(min_heap_free_ratio)) {
2042 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2043 return false;
2044 }
2045 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2046 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2047 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2048 MaxHeapFreeRatio);
2049 return false;
2050 }
2051 // This does not set the flag itself, but stores the value in a safe place for later usage.
2052 _min_heap_free_ratio = min_heap_free_ratio;
2053 return true;
2054 }
2055
2056 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2057 if (!is_percentage(max_heap_free_ratio)) {
2058 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2059 return false;
2060 }
2061 if (max_heap_free_ratio < MinHeapFreeRatio) {
2062 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2063 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2064 MinHeapFreeRatio);
2065 return false;
2066 }
2067 // This does not set the flag itself, but stores the value in a safe place for later usage.
2068 _max_heap_free_ratio = max_heap_free_ratio;
2069 return true;
2070 }
2071
2072 // Check consistency of GC selection
2073 bool Arguments::check_gc_consistency() {
2074 check_gclog_consistency();
2075 // Ensure that the user has not selected conflicting sets
2076 // of collectors.
2077 uint i = 0;
2078 if (UseSerialGC) i++;
2079 if (UseConcMarkSweepGC) i++;
2080 if (UseParallelGC || UseParallelOldGC) i++;
2081 if (UseG1GC) i++;
2082 if (i > 1) {
2083 jio_fprintf(defaultStream::error_stream(),
2084 "Conflicting collector combinations in option list; "
2085 "please refer to the release notes for the combinations "
2086 "allowed\n");
2087 return false;
2088 }
2089
2090 if (UseConcMarkSweepGC && !UseParNewGC) {
2091 jio_fprintf(defaultStream::error_stream(),
2092 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2093 return false;
2094 }
2095
2096 if (UseParNewGC && !UseConcMarkSweepGC) {
2097 jio_fprintf(defaultStream::error_stream(),
2098 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2099 return false;
2100 }
2101
2102 return true;
2103 }
2104
2105 void Arguments::check_deprecated_gc_flags() {
2106 if (FLAG_IS_CMDLINE(UseParNewGC)) {
2107 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2108 }
2109 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2110 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2111 "and will likely be removed in future release");
2112 }
2113 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2114 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2115 "Use MaxRAMFraction instead.");
2116 }
2117 }
2118
2119 // Check stack pages settings
2120 bool Arguments::check_stack_pages()
2121 {
2122 bool status = true;
2123 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2124 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2125 // greater stack shadow pages can't generate instruction to bang stack
2126 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2127 return status;
2128 }
2129
2130 // Check the consistency of vm_init_args
2131 bool Arguments::check_vm_args_consistency() {
2132 // Method for adding checks for flag consistency.
2133 // The intent is to warn the user of all possible conflicts,
2134 // before returning an error.
2135 // Note: Needs platform-dependent factoring.
2136 bool status = true;
2137
2138 if (TLABRefillWasteFraction == 0) {
2139 jio_fprintf(defaultStream::error_stream(),
2140 "TLABRefillWasteFraction should be a denominator, "
2141 "not " SIZE_FORMAT "\n",
2142 TLABRefillWasteFraction);
2143 status = false;
2144 }
2145
2146 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2147 "AdaptiveSizePolicyWeight");
2148 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2149
2150 // Divide by bucket size to prevent a large size from causing rollover when
2151 // calculating amount of memory needed to be allocated for the String table.
2152 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2153 (max_uintx / StringTable::bucket_size()), "StringTable size");
2154
2155 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2156 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2157
2158 {
2159 // Using "else if" below to avoid printing two error messages if min > max.
2160 // This will also prevent us from reporting both min>100 and max>100 at the
2161 // same time, but that is less annoying than printing two identical errors IMHO.
2162 FormatBuffer<80> err_msg("%s","");
2163 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2164 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2165 status = false;
2166 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2167 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2168 status = false;
2169 }
2170 }
2171
2172 // Min/MaxMetaspaceFreeRatio
2173 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2174 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2175
2176 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2177 jio_fprintf(defaultStream::error_stream(),
2178 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2179 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2180 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2181 MinMetaspaceFreeRatio,
2182 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2183 MaxMetaspaceFreeRatio);
2184 status = false;
2185 }
2186
2187 // Trying to keep 100% free is not practical
2188 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2189
2190 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2191 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2192 }
2193
2194 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2195 // Settings to encourage splitting.
2196 if (!FLAG_IS_CMDLINE(NewRatio)) {
2197 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2198 }
2199 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2200 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2201 }
2202 }
2203
2204 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2205 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2206 }
2207
2208 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2209 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2210 if (GCTimeLimit == 100) {
2211 // Turn off gc-overhead-limit-exceeded checks
2212 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2213 }
2214
2215 status = status && check_gc_consistency();
2216 status = status && check_stack_pages();
2217
2218 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2219 "CMSIncrementalSafetyFactor");
2220
2221 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2222 // insists that we hold the requisite locks so that the iteration is
2223 // MT-safe. For the verification at start-up and shut-down, we don't
2224 // yet have a good way of acquiring and releasing these locks,
2225 // which are not visible at the CollectedHeap level. We want to
2226 // be able to acquire these locks and then do the iteration rather
2227 // than just disable the lock verification. This will be fixed under
2228 // bug 4788986.
2229 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2230 if (VerifyDuringStartup) {
2231 warning("Heap verification at start-up disabled "
2232 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2233 VerifyDuringStartup = false; // Disable verification at start-up
2234 }
2235
2236 if (VerifyBeforeExit) {
2237 warning("Heap verification at shutdown disabled "
2238 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2239 VerifyBeforeExit = false; // Disable verification at shutdown
2240 }
2241 }
2242
2243 // Note: only executed in non-PRODUCT mode
2244 if (!UseAsyncConcMarkSweepGC &&
2245 (ExplicitGCInvokesConcurrent ||
2246 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2247 jio_fprintf(defaultStream::error_stream(),
2248 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2249 " with -UseAsyncConcMarkSweepGC");
2250 status = false;
2251 }
2252
2253 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2254
2255 #if INCLUDE_ALL_GCS
2256 if (UseG1GC) {
2257 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2258 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2259 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2260
2261 status = status && verify_percentage(G1ConfidencePercent, "G1ConfidencePercent");
2262 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2263 "InitiatingHeapOccupancyPercent");
2264 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2265 "G1RefProcDrainInterval");
2266 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2267 "G1ConcMarkStepDurationMillis");
2268 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2269 "G1ConcRSHotCardLimit");
2270 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2271 "G1ConcRSLogCacheSize");
2272 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2273 "StringDeduplicationAgeThreshold");
2274 }
2275 if (UseConcMarkSweepGC) {
2276 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2277 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2278 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2279 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2280
2281 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2282
2283 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2284 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2285 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2286
2287 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2288
2289 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2290 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2291
2292 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2293 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2294 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2295
2296 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2297
2298 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2299
2300 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2301 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2302 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2303 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2304 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2305 }
2306
2307 if (UseParallelGC || UseParallelOldGC) {
2308 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2309 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2310
2311 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2312 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2313
2314 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2315 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2316
2317 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2318
2319 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2320 }
2321 #endif // INCLUDE_ALL_GCS
2322
2323 status = status && verify_interval(RefDiscoveryPolicy,
2324 ReferenceProcessor::DiscoveryPolicyMin,
2325 ReferenceProcessor::DiscoveryPolicyMax,
2326 "RefDiscoveryPolicy");
2327
2328 // Limit the lower bound of this flag to 1 as it is used in a division
2329 // expression.
2330 status = status && verify_interval(TLABWasteTargetPercent,
2331 1, 100, "TLABWasteTargetPercent");
2332
2333 status = status && verify_object_alignment();
2334
2335 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2336 "CompressedClassSpaceSize");
2337
2338 status = status && verify_interval(MarkStackSizeMax,
2339 1, (max_jint - 1), "MarkStackSizeMax");
2340 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2341
2342 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2343
2344 status = status && verify_min_value(HeapSizePerGCThread, (size_t) os::vm_page_size(), "HeapSizePerGCThread");
2345
2346 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2347
2348 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2349 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2350
2351 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2352
2353 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2354 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2355 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2356 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2357
2358 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2359 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2360
2361 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2362 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2363 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2364
2365 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2366 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2367
2368 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2369 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2370 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2371 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2372
2373 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2374 #ifdef COMPILER1
2375 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2376 #endif
2377 status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps");
2378
2379 if (PrintNMTStatistics) {
2380 #if INCLUDE_NMT
2381 if (MemTracker::tracking_level() == NMT_off) {
2382 #endif // INCLUDE_NMT
2383 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2384 PrintNMTStatistics = false;
2385 #if INCLUDE_NMT
2386 }
2387 #endif
2388 }
2389
2390 // Need to limit the extent of the padding to reasonable size.
2391 // 8K is well beyond the reasonable HW cache line size, even with the
2392 // aggressive prefetching, while still leaving the room for segregating
2393 // among the distinct pages.
2394 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2395 jio_fprintf(defaultStream::error_stream(),
2396 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2397 ContendedPaddingWidth, 0, 8192);
2398 status = false;
2399 }
2400
2401 // Need to enforce the padding not to break the existing field alignments.
2402 // It is sufficient to check against the largest type size.
2403 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2404 jio_fprintf(defaultStream::error_stream(),
2405 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2406 ContendedPaddingWidth, BytesPerLong);
2407 status = false;
2408 }
2409
2410 // Check lower bounds of the code cache
2411 // Template Interpreter code is approximately 3X larger in debug builds.
2412 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2413 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2414 jio_fprintf(defaultStream::error_stream(),
2415 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2416 os::vm_page_size()/K);
2417 status = false;
2418 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2419 jio_fprintf(defaultStream::error_stream(),
2420 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2421 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2422 status = false;
2423 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2424 jio_fprintf(defaultStream::error_stream(),
2425 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2426 min_code_cache_size/K);
2427 status = false;
2428 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2429 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2430 jio_fprintf(defaultStream::error_stream(),
2431 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2432 CODE_CACHE_SIZE_LIMIT/M);
2433 status = false;
2434 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2435 jio_fprintf(defaultStream::error_stream(),
2436 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2437 min_code_cache_size/K);
2438 status = false;
2439 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2440 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2441 jio_fprintf(defaultStream::error_stream(),
2442 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2443 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2444 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2445 status = false;
2446 }
2447
2448 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2449 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2450 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2451 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2452
2453
2454 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2455 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2456 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2457 // Check the minimum number of compiler threads
2458 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2459
2460 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2461 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2462 }
2463
2464 return status;
2465 }
2466
2467 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2468 const char* option_type) {
2469 if (ignore) return false;
2470
2471 const char* spacer = " ";
2472 if (option_type == NULL) {
2473 option_type = ++spacer; // Set both to the empty string.
2474 }
2475
2476 if (os::obsolete_option(option)) {
2477 jio_fprintf(defaultStream::error_stream(),
2478 "Obsolete %s%soption: %s\n", option_type, spacer,
2479 option->optionString);
2480 return false;
2481 } else {
2482 jio_fprintf(defaultStream::error_stream(),
2483 "Unrecognized %s%soption: %s\n", option_type, spacer,
2484 option->optionString);
2485 return true;
2486 }
2487 }
2488
2489 static const char* user_assertion_options[] = {
2490 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2491 };
2492
2493 static const char* system_assertion_options[] = {
2494 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2495 };
2496
2497 bool Arguments::parse_uintx(const char* value,
2498 uintx* uintx_arg,
2499 uintx min_size) {
2500
2501 // Check the sign first since atomull() parses only unsigned values.
2502 bool value_is_positive = !(*value == '-');
2503
2504 if (value_is_positive) {
2505 julong n;
2506 bool good_return = atomull(value, &n);
2507 if (good_return) {
2508 bool above_minimum = n >= min_size;
2509 bool value_is_too_large = n > max_uintx;
2510
2511 if (above_minimum && !value_is_too_large) {
2512 *uintx_arg = n;
2513 return true;
2514 }
2515 }
2516 }
2517 return false;
2518 }
2519
2520 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2521 julong* long_arg,
2522 julong min_size) {
2523 if (!atomull(s, long_arg)) return arg_unreadable;
2524 return check_memory_size(*long_arg, min_size);
2525 }
2526
2527 // Parse JavaVMInitArgs structure
2528
2529 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2530 // For components of the system classpath.
2531 SysClassPath scp(Arguments::get_sysclasspath());
2532 bool scp_assembly_required = false;
2533
2534 // Save default settings for some mode flags
2535 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2536 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2537 Arguments::_ClipInlining = ClipInlining;
2538 Arguments::_BackgroundCompilation = BackgroundCompilation;
2539 if (TieredCompilation) {
2540 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2541 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2542 }
2543
2544 // Setup flags for mixed which is the default
2545 set_mode_flags(_mixed);
2546
2547 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2548 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2549 if (result != JNI_OK) {
2550 return result;
2551 }
2552
2553 // Parse JavaVMInitArgs structure passed in
2554 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2555 if (result != JNI_OK) {
2556 return result;
2557 }
2558
2559 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2560 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2561 if (result != JNI_OK) {
2562 return result;
2563 }
2564
2565 // Do final processing now that all arguments have been parsed
2566 result = finalize_vm_init_args(&scp, scp_assembly_required);
2567 if (result != JNI_OK) {
2568 return result;
2569 }
2570
2571 return JNI_OK;
2572 }
2573
2574 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2575 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2576 // are dealing with -agentpath (case where name is a path), otherwise with
2577 // -agentlib
2578 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2579 char *_name;
2580 const char *_hprof = "hprof", *_jdwp = "jdwp";
2581 size_t _len_hprof, _len_jdwp, _len_prefix;
2582
2583 if (is_path) {
2584 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2585 return false;
2586 }
2587
2588 _name++; // skip past last path separator
2589 _len_prefix = strlen(JNI_LIB_PREFIX);
2590
2591 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2592 return false;
2593 }
2594
2595 _name += _len_prefix;
2596 _len_hprof = strlen(_hprof);
2597 _len_jdwp = strlen(_jdwp);
2598
2599 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2600 _name += _len_hprof;
2601 }
2602 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2603 _name += _len_jdwp;
2604 }
2605 else {
2606 return false;
2607 }
2608
2609 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2610 return false;
2611 }
2612
2613 return true;
2614 }
2615
2616 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2617 return true;
2618 }
2619
2620 return false;
2621 }
2622
2623 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2624 SysClassPath* scp_p,
2625 bool* scp_assembly_required_p,
2626 Flag::Flags origin) {
2627 // Remaining part of option string
2628 const char* tail;
2629
2630 // iterate over arguments
2631 for (int index = 0; index < args->nOptions; index++) {
2632 bool is_absolute_path = false; // for -agentpath vs -agentlib
2633
2634 const JavaVMOption* option = args->options + index;
2635
2636 if (!match_option(option, "-Djava.class.path", &tail) &&
2637 !match_option(option, "-Dsun.java.command", &tail) &&
2638 !match_option(option, "-Dsun.java.launcher", &tail)) {
2639
2640 // add all jvm options to the jvm_args string. This string
2641 // is used later to set the java.vm.args PerfData string constant.
2642 // the -Djava.class.path and the -Dsun.java.command options are
2643 // omitted from jvm_args string as each have their own PerfData
2644 // string constant object.
2645 build_jvm_args(option->optionString);
2646 }
2647
2648 // -verbose:[class/gc/jni]
2649 if (match_option(option, "-verbose", &tail)) {
2650 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2651 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2652 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2653 } else if (!strcmp(tail, ":gc")) {
2654 FLAG_SET_CMDLINE(bool, PrintGC, true);
2655 } else if (!strcmp(tail, ":jni")) {
2656 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2657 }
2658 // -da / -ea / -disableassertions / -enableassertions
2659 // These accept an optional class/package name separated by a colon, e.g.,
2660 // -da:java.lang.Thread.
2661 } else if (match_option(option, user_assertion_options, &tail, true)) {
2662 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2663 if (*tail == '\0') {
2664 JavaAssertions::setUserClassDefault(enable);
2665 } else {
2666 assert(*tail == ':', "bogus match by match_option()");
2667 JavaAssertions::addOption(tail + 1, enable);
2668 }
2669 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2670 } else if (match_option(option, system_assertion_options, &tail, false)) {
2671 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2672 JavaAssertions::setSystemClassDefault(enable);
2673 // -bootclasspath:
2674 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2675 scp_p->reset_path(tail);
2676 *scp_assembly_required_p = true;
2677 // -bootclasspath/a:
2678 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2679 scp_p->add_suffix(tail);
2680 *scp_assembly_required_p = true;
2681 // -bootclasspath/p:
2682 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2683 scp_p->add_prefix(tail);
2684 *scp_assembly_required_p = true;
2685 // -Xrun
2686 } else if (match_option(option, "-Xrun", &tail)) {
2687 if (tail != NULL) {
2688 const char* pos = strchr(tail, ':');
2689 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2690 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2691 name[len] = '\0';
2692
2693 char *options = NULL;
2694 if(pos != NULL) {
2695 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2696 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2697 }
2698 #if !INCLUDE_JVMTI
2699 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2700 jio_fprintf(defaultStream::error_stream(),
2701 "Profiling and debugging agents are not supported in this VM\n");
2702 return JNI_ERR;
2703 }
2704 #endif // !INCLUDE_JVMTI
2705 add_init_library(name, options);
2706 }
2707 // -agentlib and -agentpath
2708 } else if (match_option(option, "-agentlib:", &tail) ||
2709 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2710 if(tail != NULL) {
2711 const char* pos = strchr(tail, '=');
2712 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2713 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2714 name[len] = '\0';
2715
2716 char *options = NULL;
2717 if(pos != NULL) {
2718 options = os::strdup_check_oom(pos + 1, mtInternal);
2719 }
2720 #if !INCLUDE_JVMTI
2721 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2722 jio_fprintf(defaultStream::error_stream(),
2723 "Profiling and debugging agents are not supported in this VM\n");
2724 return JNI_ERR;
2725 }
2726 #endif // !INCLUDE_JVMTI
2727 add_init_agent(name, options, is_absolute_path);
2728 }
2729 // -javaagent
2730 } else if (match_option(option, "-javaagent:", &tail)) {
2731 #if !INCLUDE_JVMTI
2732 jio_fprintf(defaultStream::error_stream(),
2733 "Instrumentation agents are not supported in this VM\n");
2734 return JNI_ERR;
2735 #else
2736 if(tail != NULL) {
2737 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2738 add_init_agent("instrument", options, false);
2739 }
2740 #endif // !INCLUDE_JVMTI
2741 // -Xnoclassgc
2742 } else if (match_option(option, "-Xnoclassgc")) {
2743 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2744 // -Xconcgc
2745 } else if (match_option(option, "-Xconcgc")) {
2746 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2747 // -Xnoconcgc
2748 } else if (match_option(option, "-Xnoconcgc")) {
2749 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2750 // -Xbatch
2751 } else if (match_option(option, "-Xbatch")) {
2752 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2753 // -Xmn for compatibility with other JVM vendors
2754 } else if (match_option(option, "-Xmn", &tail)) {
2755 julong long_initial_young_size = 0;
2756 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2757 if (errcode != arg_in_range) {
2758 jio_fprintf(defaultStream::error_stream(),
2759 "Invalid initial young generation size: %s\n", option->optionString);
2760 describe_range_error(errcode);
2761 return JNI_EINVAL;
2762 }
2763 FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size);
2764 FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size);
2765 // -Xms
2766 } else if (match_option(option, "-Xms", &tail)) {
2767 julong long_initial_heap_size = 0;
2768 // an initial heap size of 0 means automatically determine
2769 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2770 if (errcode != arg_in_range) {
2771 jio_fprintf(defaultStream::error_stream(),
2772 "Invalid initial heap size: %s\n", option->optionString);
2773 describe_range_error(errcode);
2774 return JNI_EINVAL;
2775 }
2776 set_min_heap_size((size_t)long_initial_heap_size);
2777 // Currently the minimum size and the initial heap sizes are the same.
2778 // Can be overridden with -XX:InitialHeapSize.
2779 FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size);
2780 // -Xmx
2781 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2782 julong long_max_heap_size = 0;
2783 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2784 if (errcode != arg_in_range) {
2785 jio_fprintf(defaultStream::error_stream(),
2786 "Invalid maximum heap size: %s\n", option->optionString);
2787 describe_range_error(errcode);
2788 return JNI_EINVAL;
2789 }
2790 FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size);
2791 // Xmaxf
2792 } else if (match_option(option, "-Xmaxf", &tail)) {
2793 char* err;
2794 int maxf = (int)(strtod(tail, &err) * 100);
2795 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2796 jio_fprintf(defaultStream::error_stream(),
2797 "Bad max heap free percentage size: %s\n",
2798 option->optionString);
2799 return JNI_EINVAL;
2800 } else {
2801 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2802 }
2803 // Xminf
2804 } else if (match_option(option, "-Xminf", &tail)) {
2805 char* err;
2806 int minf = (int)(strtod(tail, &err) * 100);
2807 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2808 jio_fprintf(defaultStream::error_stream(),
2809 "Bad min heap free percentage size: %s\n",
2810 option->optionString);
2811 return JNI_EINVAL;
2812 } else {
2813 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2814 }
2815 // -Xss
2816 } else if (match_option(option, "-Xss", &tail)) {
2817 julong long_ThreadStackSize = 0;
2818 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2819 if (errcode != arg_in_range) {
2820 jio_fprintf(defaultStream::error_stream(),
2821 "Invalid thread stack size: %s\n", option->optionString);
2822 describe_range_error(errcode);
2823 return JNI_EINVAL;
2824 }
2825 // Internally track ThreadStackSize in units of 1024 bytes.
2826 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2827 round_to((int)long_ThreadStackSize, K) / K);
2828 // -Xoss
2829 } else if (match_option(option, "-Xoss", &tail)) {
2830 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2831 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2832 julong long_CodeCacheExpansionSize = 0;
2833 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2834 if (errcode != arg_in_range) {
2835 jio_fprintf(defaultStream::error_stream(),
2836 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2837 os::vm_page_size()/K);
2838 return JNI_EINVAL;
2839 }
2840 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2841 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2842 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2843 julong long_ReservedCodeCacheSize = 0;
2844
2845 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2846 if (errcode != arg_in_range) {
2847 jio_fprintf(defaultStream::error_stream(),
2848 "Invalid maximum code cache size: %s.\n", option->optionString);
2849 return JNI_EINVAL;
2850 }
2851 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2852 // -XX:NonNMethodCodeHeapSize=
2853 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2854 julong long_NonNMethodCodeHeapSize = 0;
2855
2856 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2857 if (errcode != arg_in_range) {
2858 jio_fprintf(defaultStream::error_stream(),
2859 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2860 return JNI_EINVAL;
2861 }
2862 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
2863 // -XX:ProfiledCodeHeapSize=
2864 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2865 julong long_ProfiledCodeHeapSize = 0;
2866
2867 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2868 if (errcode != arg_in_range) {
2869 jio_fprintf(defaultStream::error_stream(),
2870 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2871 return JNI_EINVAL;
2872 }
2873 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2874 // -XX:NonProfiledCodeHeapSizee=
2875 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2876 julong long_NonProfiledCodeHeapSize = 0;
2877
2878 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2879 if (errcode != arg_in_range) {
2880 jio_fprintf(defaultStream::error_stream(),
2881 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2882 return JNI_EINVAL;
2883 }
2884 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2885 //-XX:IncreaseFirstTierCompileThresholdAt=
2886 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2887 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2888 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2889 jio_fprintf(defaultStream::error_stream(),
2890 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2891 option->optionString);
2892 return JNI_EINVAL;
2893 }
2894 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2895 // -green
2896 } else if (match_option(option, "-green")) {
2897 jio_fprintf(defaultStream::error_stream(),
2898 "Green threads support not available\n");
2899 return JNI_EINVAL;
2900 // -native
2901 } else if (match_option(option, "-native")) {
2902 // HotSpot always uses native threads, ignore silently for compatibility
2903 // -Xsqnopause
2904 } else if (match_option(option, "-Xsqnopause")) {
2905 // EVM option, ignore silently for compatibility
2906 // -Xrs
2907 } else if (match_option(option, "-Xrs")) {
2908 // Classic/EVM option, new functionality
2909 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2910 } else if (match_option(option, "-Xusealtsigs")) {
2911 // change default internal VM signals used - lower case for back compat
2912 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2913 // -Xoptimize
2914 } else if (match_option(option, "-Xoptimize")) {
2915 // EVM option, ignore silently for compatibility
2916 // -Xprof
2917 } else if (match_option(option, "-Xprof")) {
2918 #if INCLUDE_FPROF
2919 _has_profile = true;
2920 #else // INCLUDE_FPROF
2921 jio_fprintf(defaultStream::error_stream(),
2922 "Flat profiling is not supported in this VM.\n");
2923 return JNI_ERR;
2924 #endif // INCLUDE_FPROF
2925 // -Xconcurrentio
2926 } else if (match_option(option, "-Xconcurrentio")) {
2927 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2928 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2929 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2930 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2931 FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2932
2933 // -Xinternalversion
2934 } else if (match_option(option, "-Xinternalversion")) {
2935 jio_fprintf(defaultStream::output_stream(), "%s\n",
2936 VM_Version::internal_vm_info_string());
2937 vm_exit(0);
2938 #ifndef PRODUCT
2939 // -Xprintflags
2940 } else if (match_option(option, "-Xprintflags")) {
2941 CommandLineFlags::printFlags(tty, false);
2942 vm_exit(0);
2943 #endif
2944 // -D
2945 } else if (match_option(option, "-D", &tail)) {
2946 const char* value;
2947 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2948 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2949 // abort if -Djava.endorsed.dirs is set
2950 jio_fprintf(defaultStream::output_stream(),
2951 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2952 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2953 return JNI_EINVAL;
2954 }
2955 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2956 *value != '\0' && strcmp(value, "\"\"") != 0) {
2957 // abort if -Djava.ext.dirs is set
2958 jio_fprintf(defaultStream::output_stream(),
2959 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2960 return JNI_EINVAL;
2961 }
2962
2963 if (!add_property(tail)) {
2964 return JNI_ENOMEM;
2965 }
2966 // Out of the box management support
2967 if (match_option(option, "-Dcom.sun.management", &tail)) {
2968 #if INCLUDE_MANAGEMENT
2969 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2970 #else
2971 jio_fprintf(defaultStream::output_stream(),
2972 "-Dcom.sun.management is not supported in this VM.\n");
2973 return JNI_ERR;
2974 #endif
2975 }
2976 // -Xint
2977 } else if (match_option(option, "-Xint")) {
2978 set_mode_flags(_int);
2979 // -Xmixed
2980 } else if (match_option(option, "-Xmixed")) {
2981 set_mode_flags(_mixed);
2982 // -Xcomp
2983 } else if (match_option(option, "-Xcomp")) {
2984 // for testing the compiler; turn off all flags that inhibit compilation
2985 set_mode_flags(_comp);
2986 // -Xshare:dump
2987 } else if (match_option(option, "-Xshare:dump")) {
2988 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2989 set_mode_flags(_int); // Prevent compilation, which creates objects
2990 // -Xshare:on
2991 } else if (match_option(option, "-Xshare:on")) {
2992 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2993 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2994 // -Xshare:auto
2995 } else if (match_option(option, "-Xshare:auto")) {
2996 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2997 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2998 // -Xshare:off
2999 } else if (match_option(option, "-Xshare:off")) {
3000 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3001 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3002 // -Xverify
3003 } else if (match_option(option, "-Xverify", &tail)) {
3004 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3005 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3006 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3007 } else if (strcmp(tail, ":remote") == 0) {
3008 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3009 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3010 } else if (strcmp(tail, ":none") == 0) {
3011 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3012 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3013 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3014 return JNI_EINVAL;
3015 }
3016 // -Xdebug
3017 } else if (match_option(option, "-Xdebug")) {
3018 // note this flag has been used, then ignore
3019 set_xdebug_mode(true);
3020 // -Xnoagent
3021 } else if (match_option(option, "-Xnoagent")) {
3022 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3023 } else if (match_option(option, "-Xboundthreads")) {
3024 // Ignore silently for compatibility
3025 } else if (match_option(option, "-Xloggc:", &tail)) {
3026 // Redirect GC output to the file. -Xloggc:<filename>
3027 // ostream_init_log(), when called will use this filename
3028 // to initialize a fileStream.
3029 _gc_log_filename = os::strdup_check_oom(tail);
3030 if (!is_filename_valid(_gc_log_filename)) {
3031 jio_fprintf(defaultStream::output_stream(),
3032 "Invalid file name for use with -Xloggc: Filename can only contain the "
3033 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3034 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3035 return JNI_EINVAL;
3036 }
3037 FLAG_SET_CMDLINE(bool, PrintGC, true);
3038 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3039
3040 // JNI hooks
3041 } else if (match_option(option, "-Xcheck", &tail)) {
3042 if (!strcmp(tail, ":jni")) {
3043 #if !INCLUDE_JNI_CHECK
3044 warning("JNI CHECKING is not supported in this VM");
3045 #else
3046 CheckJNICalls = true;
3047 #endif // INCLUDE_JNI_CHECK
3048 } else if (is_bad_option(option, args->ignoreUnrecognized,
3049 "check")) {
3050 return JNI_EINVAL;
3051 }
3052 } else if (match_option(option, "vfprintf")) {
3053 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3054 } else if (match_option(option, "exit")) {
3055 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3056 } else if (match_option(option, "abort")) {
3057 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3058 // -XX:+AggressiveHeap
3059 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3060
3061 // This option inspects the machine and attempts to set various
3062 // parameters to be optimal for long-running, memory allocation
3063 // intensive jobs. It is intended for machines with large
3064 // amounts of cpu and memory.
3065
3066 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3067 // VM, but we may not be able to represent the total physical memory
3068 // available (like having 8gb of memory on a box but using a 32bit VM).
3069 // Thus, we need to make sure we're using a julong for intermediate
3070 // calculations.
3071 julong initHeapSize;
3072 julong total_memory = os::physical_memory();
3073
3074 if (total_memory < (julong)256*M) {
3075 jio_fprintf(defaultStream::error_stream(),
3076 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3077 vm_exit(1);
3078 }
3079
3080 // The heap size is half of available memory, or (at most)
3081 // all of possible memory less 160mb (leaving room for the OS
3082 // when using ISM). This is the maximum; because adaptive sizing
3083 // is turned on below, the actual space used may be smaller.
3084
3085 initHeapSize = MIN2(total_memory / (julong)2,
3086 total_memory - (julong)160*M);
3087
3088 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3089
3090 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3091 FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize);
3092 FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize);
3093 // Currently the minimum size and the initial heap sizes are the same.
3094 set_min_heap_size(initHeapSize);
3095 }
3096 if (FLAG_IS_DEFAULT(NewSize)) {
3097 // Make the young generation 3/8ths of the total heap.
3098 FLAG_SET_CMDLINE(size_t, NewSize,
3099 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3100 FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize);
3101 }
3102
3103 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3104 FLAG_SET_DEFAULT(UseLargePages, true);
3105 #endif
3106
3107 // Increase some data structure sizes for efficiency
3108 FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize);
3109 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3110 FLAG_SET_CMDLINE(size_t, TLABSize, 256*K);
3111
3112 // See the OldPLABSize comment below, but replace 'after promotion'
3113 // with 'after copying'. YoungPLABSize is the size of the survivor
3114 // space per-gc-thread buffers. The default is 4kw.
3115 FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K); // Note: this is in words
3116
3117 // OldPLABSize is the size of the buffers in the old gen that
3118 // UseParallelGC uses to promote live data that doesn't fit in the
3119 // survivor spaces. At any given time, there's one for each gc thread.
3120 // The default size is 1kw. These buffers are rarely used, since the
3121 // survivor spaces are usually big enough. For specjbb, however, there
3122 // are occasions when there's lots of live data in the young gen
3123 // and we end up promoting some of it. We don't have a definite
3124 // explanation for why bumping OldPLABSize helps, but the theory
3125 // is that a bigger PLAB results in retaining something like the
3126 // original allocation order after promotion, which improves mutator
3127 // locality. A minor effect may be that larger PLABs reduce the
3128 // number of PLAB allocation events during gc. The value of 8kw
3129 // was arrived at by experimenting with specjbb.
3130 FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K); // Note: this is in words
3131
3132 // Enable parallel GC and adaptive generation sizing
3133 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3134 FLAG_SET_DEFAULT(ParallelGCThreads,
3135 Abstract_VM_Version::parallel_worker_threads());
3136
3137 // Encourage steady state memory management
3138 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3139
3140 // This appears to improve mutator locality
3141 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3142
3143 // Get around early Solaris scheduling bug
3144 // (affinity vs other jobs on system)
3145 // but disallow DR and offlining (5008695).
3146 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3147
3148 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3149 // and the last option wins.
3150 } else if (match_option(option, "-XX:+NeverTenure")) {
3151 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3152 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3153 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3154 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3155 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3156 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3157 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3158 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3159 uintx max_tenuring_thresh = 0;
3160 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3161 jio_fprintf(defaultStream::error_stream(),
3162 "Improperly specified VM option 'MaxTenuringThreshold=%s'\n", tail);
3163 return JNI_EINVAL;
3164 }
3165 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3166
3167 if (MaxTenuringThreshold == 0) {
3168 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3169 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3170 } else {
3171 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3172 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3173 }
3174 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3175 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3176 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3177 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3178 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3179 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3180 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3181 #if defined(DTRACE_ENABLED)
3182 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3183 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3184 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3185 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3186 #else // defined(DTRACE_ENABLED)
3187 jio_fprintf(defaultStream::error_stream(),
3188 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3189 return JNI_EINVAL;
3190 #endif // defined(DTRACE_ENABLED)
3191 #ifdef ASSERT
3192 } else if (match_option(option, "-XX:+FullGCALot")) {
3193 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3194 // disable scavenge before parallel mark-compact
3195 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3196 #endif
3197 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3198 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3199 julong stack_size = 0;
3200 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3201 if (errcode != arg_in_range) {
3202 jio_fprintf(defaultStream::error_stream(),
3203 "Invalid mark stack size: %s\n", option->optionString);
3204 describe_range_error(errcode);
3205 return JNI_EINVAL;
3206 }
3207 jio_fprintf(defaultStream::error_stream(),
3208 "Please use -XX:MarkStackSize in place of "
3209 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n");
3210 FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size);
3211 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3212 julong max_stack_size = 0;
3213 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3214 if (errcode != arg_in_range) {
3215 jio_fprintf(defaultStream::error_stream(),
3216 "Invalid maximum mark stack size: %s\n",
3217 option->optionString);
3218 describe_range_error(errcode);
3219 return JNI_EINVAL;
3220 }
3221 jio_fprintf(defaultStream::error_stream(),
3222 "Please use -XX:MarkStackSizeMax in place of "
3223 "-XX:CMSMarkStackSizeMax in the future\n");
3224 FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size);
3225 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3226 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3227 uintx conc_threads = 0;
3228 if (!parse_uintx(tail, &conc_threads, 1)) {
3229 jio_fprintf(defaultStream::error_stream(),
3230 "Invalid concurrent threads: %s\n", option->optionString);
3231 return JNI_EINVAL;
3232 }
3233 jio_fprintf(defaultStream::error_stream(),
3234 "Please use -XX:ConcGCThreads in place of "
3235 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n");
3236 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3237 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3238 julong max_direct_memory_size = 0;
3239 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3240 if (errcode != arg_in_range) {
3241 jio_fprintf(defaultStream::error_stream(),
3242 "Invalid maximum direct memory size: %s\n",
3243 option->optionString);
3244 describe_range_error(errcode);
3245 return JNI_EINVAL;
3246 }
3247 FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size);
3248 #if !INCLUDE_MANAGEMENT
3249 } else if (match_option(option, "-XX:+ManagementServer")) {
3250 jio_fprintf(defaultStream::error_stream(),
3251 "ManagementServer is not supported in this VM.\n");
3252 return JNI_ERR;
3253 #endif // INCLUDE_MANAGEMENT
3254 // CreateMinidumpOnCrash is removed, and replaced by CreateCoredumpOnCrash
3255 } else if (match_option(option, "-XX:+CreateMinidumpOnCrash")) {
3256 FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, true);
3257 jio_fprintf(defaultStream::output_stream(),
3258 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is on\n");
3259 } else if (match_option(option, "-XX:-CreateMinidumpOnCrash")) {
3260 FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, false);
3261 jio_fprintf(defaultStream::output_stream(),
3262 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is off\n");
3263 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3264 // Skip -XX:Flags= since that case has already been handled
3265 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3266 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3267 return JNI_EINVAL;
3268 }
3269 }
3270 // Unknown option
3271 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3272 return JNI_ERR;
3273 }
3274 }
3275
3276 // PrintSharedArchiveAndExit will turn on
3277 // -Xshare:on
3278 // -XX:+TraceClassPaths
3279 if (PrintSharedArchiveAndExit) {
3280 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3281 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3282 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3283 }
3284
3285 // Change the default value for flags which have different default values
3286 // when working with older JDKs.
3287 #ifdef LINUX
3288 if (JDK_Version::current().compare_major(6) <= 0 &&
3289 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3290 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3291 }
3292 #endif // LINUX
3293 fix_appclasspath();
3294 return JNI_OK;
3295 }
3296
3297 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3298 //
3299 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3300 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3301 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3302 // path is treated as the current directory.
3303 //
3304 // This causes problems with CDS, which requires that all directories specified in the classpath
3305 // must be empty. In most cases, applications do NOT want to load classes from the current
3306 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3307 // scripts compatible with CDS.
3308 void Arguments::fix_appclasspath() {
3309 if (IgnoreEmptyClassPaths) {
3310 const char separator = *os::path_separator();
3311 const char* src = _java_class_path->value();
3312
3313 // skip over all the leading empty paths
3314 while (*src == separator) {
3315 src ++;
3316 }
3317
3318 char* copy = os::strdup_check_oom(src, mtInternal);
3319
3320 // trim all trailing empty paths
3321 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3322 *tail = '\0';
3323 }
3324
3325 char from[3] = {separator, separator, '\0'};
3326 char to [2] = {separator, '\0'};
3327 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3328 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3329 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3330 }
3331
3332 _java_class_path->set_value(copy);
3333 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3334 }
3335
3336 if (!PrintSharedArchiveAndExit) {
3337 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3338 }
3339 }
3340
3341 static bool has_jar_files(const char* directory) {
3342 DIR* dir = os::opendir(directory);
3343 if (dir == NULL) return false;
3344
3345 struct dirent *entry;
3346 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3347 bool hasJarFile = false;
3348 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3349 const char* name = entry->d_name;
3350 const char* ext = name + strlen(name) - 4;
3351 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3352 }
3353 FREE_C_HEAP_ARRAY(char, dbuf);
3354 os::closedir(dir);
3355 return hasJarFile ;
3356 }
3357
3358 static int check_non_empty_dirs(const char* path) {
3359 const char separator = *os::path_separator();
3360 const char* const end = path + strlen(path);
3361 int nonEmptyDirs = 0;
3362 while (path < end) {
3363 const char* tmp_end = strchr(path, separator);
3364 if (tmp_end == NULL) {
3365 if (has_jar_files(path)) {
3366 nonEmptyDirs++;
3367 jio_fprintf(defaultStream::output_stream(),
3368 "Non-empty directory: %s\n", path);
3369 }
3370 path = end;
3371 } else {
3372 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3373 memcpy(dirpath, path, tmp_end - path);
3374 dirpath[tmp_end - path] = '\0';
3375 if (has_jar_files(dirpath)) {
3376 nonEmptyDirs++;
3377 jio_fprintf(defaultStream::output_stream(),
3378 "Non-empty directory: %s\n", dirpath);
3379 }
3380 FREE_C_HEAP_ARRAY(char, dirpath);
3381 path = tmp_end + 1;
3382 }
3383 }
3384 return nonEmptyDirs;
3385 }
3386
3387 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3388 // check if the default lib/endorsed directory exists; if so, error
3389 char path[JVM_MAXPATHLEN];
3390 const char* fileSep = os::file_separator();
3391 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3392
3393 if (CheckEndorsedAndExtDirs) {
3394 int nonEmptyDirs = 0;
3395 // check endorsed directory
3396 nonEmptyDirs += check_non_empty_dirs(path);
3397 // check the extension directories
3398 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3399 if (nonEmptyDirs > 0) {
3400 return JNI_ERR;
3401 }
3402 }
3403
3404 DIR* dir = os::opendir(path);
3405 if (dir != NULL) {
3406 jio_fprintf(defaultStream::output_stream(),
3407 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3408 "in modular form will be supported via the concept of upgradeable modules.\n");
3409 os::closedir(dir);
3410 return JNI_ERR;
3411 }
3412
3413 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3414 dir = os::opendir(path);
3415 if (dir != NULL) {
3416 jio_fprintf(defaultStream::output_stream(),
3417 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3418 "Use -classpath instead.\n.");
3419 os::closedir(dir);
3420 return JNI_ERR;
3421 }
3422
3423 if (scp_assembly_required) {
3424 // Assemble the bootclasspath elements into the final path.
3425 Arguments::set_sysclasspath(scp_p->combined_path());
3426 }
3427
3428 // This must be done after all arguments have been processed.
3429 // java_compiler() true means set to "NONE" or empty.
3430 if (java_compiler() && !xdebug_mode()) {
3431 // For backwards compatibility, we switch to interpreted mode if
3432 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3433 // not specified.
3434 set_mode_flags(_int);
3435 }
3436
3437 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3438 // but like -Xint, leave compilation thresholds unaffected.
3439 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3440 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3441 set_mode_flags(_int);
3442 }
3443
3444 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3445 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3446 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3447 }
3448
3449 #ifndef COMPILER2
3450 // Don't degrade server performance for footprint
3451 if (FLAG_IS_DEFAULT(UseLargePages) &&
3452 MaxHeapSize < LargePageHeapSizeThreshold) {
3453 // No need for large granularity pages w/small heaps.
3454 // Note that large pages are enabled/disabled for both the
3455 // Java heap and the code cache.
3456 FLAG_SET_DEFAULT(UseLargePages, false);
3457 }
3458
3459 #else
3460 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3461 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3462 }
3463 #endif
3464
3465 #ifndef TIERED
3466 // Tiered compilation is undefined.
3467 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3468 #endif
3469
3470 // If we are running in a headless jre, force java.awt.headless property
3471 // to be true unless the property has already been set.
3472 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3473 if (os::is_headless_jre()) {
3474 const char* headless = Arguments::get_property("java.awt.headless");
3475 if (headless == NULL) {
3476 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3477 if (headless_env == NULL) {
3478 if (!add_property("java.awt.headless=true")) {
3479 return JNI_ENOMEM;
3480 }
3481 } else {
3482 char buffer[256];
3483 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3484 if (!add_property(buffer)) {
3485 return JNI_ENOMEM;
3486 }
3487 }
3488 }
3489 }
3490
3491 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3492 // CMS can only be used with ParNew
3493 FLAG_SET_ERGO(bool, UseParNewGC, true);
3494 }
3495
3496 if (!check_vm_args_consistency()) {
3497 return JNI_ERR;
3498 }
3499
3500 return JNI_OK;
3501 }
3502
3503 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3504 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3505 scp_assembly_required_p);
3506 }
3507
3508 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3509 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3510 scp_assembly_required_p);
3511 }
3512
3513 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3514 char *buffer = ::getenv(name);
3515
3516 // Don't check this variable if user has special privileges
3517 // (e.g. unix su command).
3518 if (buffer == NULL || os::have_special_privileges()) {
3519 return JNI_OK;
3520 }
3521
3522 if ((buffer = os::strdup(buffer)) == NULL) {
3523 return JNI_ENOMEM;
3524 }
3525
3526 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3527 jio_fprintf(defaultStream::error_stream(),
3528 "Picked up %s: %s\n", name, buffer);
3529 char* rd = buffer; // pointer to the input string (rd)
3530 while (true) { // repeat for all options in the input string
3531 while (isspace(*rd)) rd++; // skip whitespace
3532 if (*rd == 0) break; // we re done when the input string is read completely
3533
3534 // The output, option string, overwrites the input string.
3535 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3536 // input string (rd).
3537 char* wrt = rd;
3538
3539 JavaVMOption option;
3540 option.optionString = wrt;
3541 options->append(option); // Fill in option
3542 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3543 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3544 int quote = *rd; // matching quote to look for
3545 rd++; // don't copy open quote
3546 while (*rd != quote) { // include everything (even spaces) up until quote
3547 if (*rd == 0) { // string termination means unmatched string
3548 jio_fprintf(defaultStream::error_stream(),
3549 "Unmatched quote in %s\n", name);
3550 delete options;
3551 os::free(buffer);
3552 return JNI_ERR;
3553 }
3554 *wrt++ = *rd++; // copy to option string
3555 }
3556 rd++; // don't copy close quote
3557 } else {
3558 *wrt++ = *rd++; // copy to option string
3559 }
3560 }
3561 // Need to check if we're done before writing a NULL,
3562 // because the write could be to the byte that rd is pointing to.
3563 if (*rd++ == 0) {
3564 *wrt = 0;
3565 break;
3566 }
3567 *wrt = 0; // Zero terminate option
3568 }
3569 JavaVMOption* options_arr =
3570 NEW_C_HEAP_ARRAY_RETURN_NULL(JavaVMOption, options->length(), mtInternal);
3571 if (options_arr == NULL) {
3572 delete options;
3573 os::free(buffer);
3574 return JNI_ENOMEM;
3575 }
3576 for (int i = 0; i < options->length(); i++) {
3577 options_arr[i] = options->at(i);
3578 }
3579
3580 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3581 JavaVMInitArgs vm_args;
3582 vm_args.version = JNI_VERSION_1_2;
3583 vm_args.options = options_arr;
3584 vm_args.nOptions = options->length();
3585 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3586
3587 if (PrintVMOptions) {
3588 const char* tail;
3589 for (int i = 0; i < vm_args.nOptions; i++) {
3590 const JavaVMOption *option = vm_args.options + i;
3591 if (match_option(option, "-XX:", &tail)) {
3592 logOption(tail);
3593 }
3594 }
3595 }
3596
3597 jint result = parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p,
3598 Flag::ENVIRON_VAR);
3599 FREE_C_HEAP_ARRAY(JavaVMOption, options_arr);
3600 delete options;
3601 os::free(buffer);
3602 return result;
3603 }
3604
3605 void Arguments::set_shared_spaces_flags() {
3606 if (DumpSharedSpaces) {
3607 if (RequireSharedSpaces) {
3608 warning("cannot dump shared archive while using shared archive");
3609 }
3610 UseSharedSpaces = false;
3611 #ifdef _LP64
3612 if (!UseCompressedOops || !UseCompressedClassPointers) {
3613 vm_exit_during_initialization(
3614 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3615 }
3616 } else {
3617 if (!UseCompressedOops || !UseCompressedClassPointers) {
3618 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3619 }
3620 #endif
3621 }
3622 }
3623
3624 #if !INCLUDE_ALL_GCS
3625 static void force_serial_gc() {
3626 FLAG_SET_DEFAULT(UseSerialGC, true);
3627 UNSUPPORTED_GC_OPTION(UseG1GC);
3628 UNSUPPORTED_GC_OPTION(UseParallelGC);
3629 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3630 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3631 UNSUPPORTED_GC_OPTION(UseParNewGC);
3632 }
3633 #endif // INCLUDE_ALL_GCS
3634
3635 // Sharing support
3636 // Construct the path to the archive
3637 static char* get_shared_archive_path() {
3638 char *shared_archive_path;
3639 if (SharedArchiveFile == NULL) {
3640 char jvm_path[JVM_MAXPATHLEN];
3641 os::jvm_path(jvm_path, sizeof(jvm_path));
3642 char *end = strrchr(jvm_path, *os::file_separator());
3643 if (end != NULL) *end = '\0';
3644 size_t jvm_path_len = strlen(jvm_path);
3645 size_t file_sep_len = strlen(os::file_separator());
3646 const size_t len = jvm_path_len + file_sep_len + 20;
3647 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3648 if (shared_archive_path != NULL) {
3649 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3650 jvm_path, os::file_separator());
3651 }
3652 } else {
3653 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3654 }
3655 return shared_archive_path;
3656 }
3657
3658 #ifndef PRODUCT
3659 // Determine whether LogVMOutput should be implicitly turned on.
3660 static bool use_vm_log() {
3661 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3662 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3663 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3664 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3665 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3666 return true;
3667 }
3668
3669 #ifdef COMPILER1
3670 if (PrintC1Statistics) {
3671 return true;
3672 }
3673 #endif // COMPILER1
3674
3675 #ifdef COMPILER2
3676 if (PrintOptoAssembly || PrintOptoStatistics) {
3677 return true;
3678 }
3679 #endif // COMPILER2
3680
3681 return false;
3682 }
3683 #endif // PRODUCT
3684
3685 // Parse entry point called from JNI_CreateJavaVM
3686
3687 jint Arguments::parse(const JavaVMInitArgs* args) {
3688
3689 // Remaining part of option string
3690 const char* tail;
3691
3692 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3693 const char* hotspotrc = ".hotspotrc";
3694 bool settings_file_specified = false;
3695 bool needs_hotspotrc_warning = false;
3696
3697 const char* flags_file;
3698 int index;
3699 for (index = 0; index < args->nOptions; index++) {
3700 const JavaVMOption *option = args->options + index;
3701 if (ArgumentsExt::process_options(option)) {
3702 continue;
3703 }
3704 if (match_option(option, "-XX:Flags=", &tail)) {
3705 flags_file = tail;
3706 settings_file_specified = true;
3707 continue;
3708 }
3709 if (match_option(option, "-XX:+PrintVMOptions")) {
3710 PrintVMOptions = true;
3711 continue;
3712 }
3713 if (match_option(option, "-XX:-PrintVMOptions")) {
3714 PrintVMOptions = false;
3715 continue;
3716 }
3717 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3718 IgnoreUnrecognizedVMOptions = true;
3719 continue;
3720 }
3721 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3722 IgnoreUnrecognizedVMOptions = false;
3723 continue;
3724 }
3725 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3726 CommandLineFlags::printFlags(tty, false);
3727 vm_exit(0);
3728 }
3729 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3730 #if INCLUDE_NMT
3731 // The launcher did not setup nmt environment variable properly.
3732 if (!MemTracker::check_launcher_nmt_support(tail)) {
3733 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3734 }
3735
3736 // Verify if nmt option is valid.
3737 if (MemTracker::verify_nmt_option()) {
3738 // Late initialization, still in single-threaded mode.
3739 if (MemTracker::tracking_level() >= NMT_summary) {
3740 MemTracker::init();
3741 }
3742 } else {
3743 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3744 }
3745 continue;
3746 #else
3747 jio_fprintf(defaultStream::error_stream(),
3748 "Native Memory Tracking is not supported in this VM\n");
3749 return JNI_ERR;
3750 #endif
3751 }
3752
3753 #ifndef PRODUCT
3754 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3755 CommandLineFlags::printFlags(tty, true);
3756 vm_exit(0);
3757 }
3758 #endif
3759 }
3760
3761 if (IgnoreUnrecognizedVMOptions) {
3762 // uncast const to modify the flag args->ignoreUnrecognized
3763 *(jboolean*)(&args->ignoreUnrecognized) = true;
3764 }
3765
3766 // Parse specified settings file
3767 if (settings_file_specified) {
3768 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3769 return JNI_EINVAL;
3770 }
3771 } else {
3772 #ifdef ASSERT
3773 // Parse default .hotspotrc settings file
3774 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3775 return JNI_EINVAL;
3776 }
3777 #else
3778 struct stat buf;
3779 if (os::stat(hotspotrc, &buf) == 0) {
3780 needs_hotspotrc_warning = true;
3781 }
3782 #endif
3783 }
3784
3785 if (PrintVMOptions) {
3786 for (index = 0; index < args->nOptions; index++) {
3787 const JavaVMOption *option = args->options + index;
3788 if (match_option(option, "-XX:", &tail)) {
3789 logOption(tail);
3790 }
3791 }
3792 }
3793
3794 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3795 jint result = parse_vm_init_args(args);
3796 if (result != JNI_OK) {
3797 return result;
3798 }
3799
3800 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3801 SharedArchivePath = get_shared_archive_path();
3802 if (SharedArchivePath == NULL) {
3803 return JNI_ENOMEM;
3804 }
3805
3806 // Set up VerifySharedSpaces
3807 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3808 VerifySharedSpaces = true;
3809 }
3810
3811 // Delay warning until here so that we've had a chance to process
3812 // the -XX:-PrintWarnings flag
3813 if (needs_hotspotrc_warning) {
3814 warning("%s file is present but has been ignored. "
3815 "Run with -XX:Flags=%s to load the file.",
3816 hotspotrc, hotspotrc);
3817 }
3818
3819 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3820 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3821 #endif
3822
3823 ArgumentsExt::report_unsupported_options();
3824
3825 #ifndef PRODUCT
3826 if (TraceBytecodesAt != 0) {
3827 TraceBytecodes = true;
3828 }
3829 if (CountCompiledCalls) {
3830 if (UseCounterDecay) {
3831 warning("UseCounterDecay disabled because CountCalls is set");
3832 UseCounterDecay = false;
3833 }
3834 }
3835 #endif // PRODUCT
3836
3837 if (ScavengeRootsInCode == 0) {
3838 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3839 warning("forcing ScavengeRootsInCode non-zero");
3840 }
3841 ScavengeRootsInCode = 1;
3842 }
3843
3844 if (PrintGCDetails) {
3845 // Turn on -verbose:gc options as well
3846 PrintGC = true;
3847 }
3848
3849 // Set object alignment values.
3850 set_object_alignment();
3851
3852 #if !INCLUDE_ALL_GCS
3853 force_serial_gc();
3854 #endif // INCLUDE_ALL_GCS
3855 #if !INCLUDE_CDS
3856 if (DumpSharedSpaces || RequireSharedSpaces) {
3857 jio_fprintf(defaultStream::error_stream(),
3858 "Shared spaces are not supported in this VM\n");
3859 return JNI_ERR;
3860 }
3861 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3862 warning("Shared spaces are not supported in this VM");
3863 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3864 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3865 }
3866 no_shared_spaces("CDS Disabled");
3867 #endif // INCLUDE_CDS
3868
3869 return JNI_OK;
3870 }
3871
3872 jint Arguments::apply_ergo() {
3873
3874 // Set flags based on ergonomics.
3875 set_ergonomics_flags();
3876
3877 set_shared_spaces_flags();
3878
3879 // Check the GC selections again.
3880 if (!check_gc_consistency()) {
3881 return JNI_EINVAL;
3882 }
3883
3884 if (TieredCompilation) {
3885 set_tiered_flags();
3886 } else {
3887 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3888 if (CompilationPolicyChoice >= 2) {
3889 vm_exit_during_initialization(
3890 "Incompatible compilation policy selected", NULL);
3891 }
3892 // Scale CompileThreshold
3893 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
3894 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
3895 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
3896 }
3897 }
3898
3899 #ifdef COMPILER2
3900 #ifndef PRODUCT
3901 if (PrintIdealGraphLevel > 0) {
3902 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3903 }
3904 #endif
3905 #endif
3906
3907 // Set heap size based on available physical memory
3908 set_heap_size();
3909
3910 ArgumentsExt::set_gc_specific_flags();
3911
3912 // Initialize Metaspace flags and alignments
3913 Metaspace::ergo_initialize();
3914
3915 // Set bytecode rewriting flags
3916 set_bytecode_flags();
3917
3918 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3919 set_aggressive_opts_flags();
3920
3921 // Turn off biased locking for locking debug mode flags,
3922 // which are subtly different from each other but neither works with
3923 // biased locking
3924 if (UseHeavyMonitors
3925 #ifdef COMPILER1
3926 || !UseFastLocking
3927 #endif // COMPILER1
3928 ) {
3929 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3930 // flag set to true on command line; warn the user that they
3931 // can't enable biased locking here
3932 warning("Biased Locking is not supported with locking debug flags"
3933 "; ignoring UseBiasedLocking flag." );
3934 }
3935 UseBiasedLocking = false;
3936 }
3937
3938 #ifdef ZERO
3939 // Clear flags not supported on zero.
3940 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3941 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3942 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3943 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3944 #endif // CC_INTERP
3945
3946 #ifdef COMPILER2
3947 if (!EliminateLocks) {
3948 EliminateNestedLocks = false;
3949 }
3950 if (!Inline) {
3951 IncrementalInline = false;
3952 }
3953 #ifndef PRODUCT
3954 if (!IncrementalInline) {
3955 AlwaysIncrementalInline = false;
3956 }
3957 #endif
3958 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3959 // nothing to use the profiling, turn if off
3960 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3961 }
3962 #endif
3963
3964 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3965 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3966 DebugNonSafepoints = true;
3967 }
3968
3969 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3970 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3971 }
3972
3973 #ifndef PRODUCT
3974 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3975 if (use_vm_log()) {
3976 LogVMOutput = true;
3977 }
3978 }
3979 #endif // PRODUCT
3980
3981 if (PrintCommandLineFlags) {
3982 CommandLineFlags::printSetFlags(tty);
3983 }
3984
3985 // Apply CPU specific policy for the BiasedLocking
3986 if (UseBiasedLocking) {
3987 if (!VM_Version::use_biased_locking() &&
3988 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3989 UseBiasedLocking = false;
3990 }
3991 }
3992 #ifdef COMPILER2
3993 if (!UseBiasedLocking || EmitSync != 0) {
3994 UseOptoBiasInlining = false;
3995 }
3996 #endif
3997
3998 return JNI_OK;
3999 }
4000
4001 jint Arguments::adjust_after_os() {
4002 if (UseNUMA) {
4003 if (UseParallelGC || UseParallelOldGC) {
4004 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4005 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4006 }
4007 }
4008 // UseNUMAInterleaving is set to ON for all collectors and
4009 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4010 // such as the parallel collector for Linux and Solaris will
4011 // interleave old gen and survivor spaces on top of NUMA
4012 // allocation policy for the eden space.
4013 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4014 // all platforms and ParallelGC on Windows will interleave all
4015 // of the heap spaces across NUMA nodes.
4016 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4017 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4018 }
4019 }
4020 return JNI_OK;
4021 }
4022
4023 int Arguments::PropertyList_count(SystemProperty* pl) {
4024 int count = 0;
4025 while(pl != NULL) {
4026 count++;
4027 pl = pl->next();
4028 }
4029 return count;
4030 }
4031
4032 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4033 assert(key != NULL, "just checking");
4034 SystemProperty* prop;
4035 for (prop = pl; prop != NULL; prop = prop->next()) {
4036 if (strcmp(key, prop->key()) == 0) return prop->value();
4037 }
4038 return NULL;
4039 }
4040
4041 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4042 int count = 0;
4043 const char* ret_val = NULL;
4044
4045 while(pl != NULL) {
4046 if(count >= index) {
4047 ret_val = pl->key();
4048 break;
4049 }
4050 count++;
4051 pl = pl->next();
4052 }
4053
4054 return ret_val;
4055 }
4056
4057 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4058 int count = 0;
4059 char* ret_val = NULL;
4060
4061 while(pl != NULL) {
4062 if(count >= index) {
4063 ret_val = pl->value();
4064 break;
4065 }
4066 count++;
4067 pl = pl->next();
4068 }
4069
4070 return ret_val;
4071 }
4072
4073 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4074 SystemProperty* p = *plist;
4075 if (p == NULL) {
4076 *plist = new_p;
4077 } else {
4078 while (p->next() != NULL) {
4079 p = p->next();
4080 }
4081 p->set_next(new_p);
4082 }
4083 }
4084
4085 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4086 if (plist == NULL)
4087 return;
4088
4089 SystemProperty* new_p = new SystemProperty(k, v, true);
4090 PropertyList_add(plist, new_p);
4091 }
4092
4093 void Arguments::PropertyList_add(SystemProperty *element) {
4094 PropertyList_add(&_system_properties, element);
4095 }
4096
4097 // This add maintains unique property key in the list.
4098 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4099 if (plist == NULL)
4100 return;
4101
4102 // If property key exist then update with new value.
4103 SystemProperty* prop;
4104 for (prop = *plist; prop != NULL; prop = prop->next()) {
4105 if (strcmp(k, prop->key()) == 0) {
4106 if (append) {
4107 prop->append_value(v);
4108 } else {
4109 prop->set_value(v);
4110 }
4111 return;
4112 }
4113 }
4114
4115 PropertyList_add(plist, k, v);
4116 }
4117
4118 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4119 // Returns true if all of the source pointed by src has been copied over to
4120 // the destination buffer pointed by buf. Otherwise, returns false.
4121 // Notes:
4122 // 1. If the length (buflen) of the destination buffer excluding the
4123 // NULL terminator character is not long enough for holding the expanded
4124 // pid characters, it also returns false instead of returning the partially
4125 // expanded one.
4126 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4127 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4128 char* buf, size_t buflen) {
4129 const char* p = src;
4130 char* b = buf;
4131 const char* src_end = &src[srclen];
4132 char* buf_end = &buf[buflen - 1];
4133
4134 while (p < src_end && b < buf_end) {
4135 if (*p == '%') {
4136 switch (*(++p)) {
4137 case '%': // "%%" ==> "%"
4138 *b++ = *p++;
4139 break;
4140 case 'p': { // "%p" ==> current process id
4141 // buf_end points to the character before the last character so
4142 // that we could write '\0' to the end of the buffer.
4143 size_t buf_sz = buf_end - b + 1;
4144 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4145
4146 // if jio_snprintf fails or the buffer is not long enough to hold
4147 // the expanded pid, returns false.
4148 if (ret < 0 || ret >= (int)buf_sz) {
4149 return false;
4150 } else {
4151 b += ret;
4152 assert(*b == '\0', "fail in copy_expand_pid");
4153 if (p == src_end && b == buf_end + 1) {
4154 // reach the end of the buffer.
4155 return true;
4156 }
4157 }
4158 p++;
4159 break;
4160 }
4161 default :
4162 *b++ = '%';
4163 }
4164 } else {
4165 *b++ = *p++;
4166 }
4167 }
4168 *b = '\0';
4169 return (p == src_end); // return false if not all of the source was copied
4170 }