1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "compiler/compilerOracle.hpp"
31 #include "memory/allocation.inline.hpp"
32 #include "memory/cardTableRS.hpp"
33 #include "memory/genCollectedHeap.hpp"
34 #include "memory/referenceProcessor.hpp"
35 #include "memory/universe.inline.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "prims/jvmtiExport.hpp"
38 #include "runtime/arguments.hpp"
39 #include "runtime/arguments_ext.hpp"
40 #include "runtime/globals_extension.hpp"
41 #include "runtime/java.hpp"
42 #include "runtime/os.hpp"
43 #include "runtime/vm_version.hpp"
44 #include "services/management.hpp"
45 #include "services/memTracker.hpp"
46 #include "utilities/defaultStream.hpp"
47 #include "utilities/macros.hpp"
48 #include "utilities/stringUtils.hpp"
49 #include "utilities/taskqueue.hpp"
50 #if INCLUDE_ALL_GCS
51 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
52 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
53 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
54 #endif // INCLUDE_ALL_GCS
55
56 // Note: This is a special bug reporting site for the JVM
57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
58 #define DEFAULT_JAVA_LAUNCHER "generic"
59
60 #define UNSUPPORTED_GC_OPTION(gc) \
61 do { \
62 if (gc) { \
63 if (FLAG_IS_CMDLINE(gc)) { \
64 warning(#gc " is not supported in this VM. Using Serial GC."); \
65 } \
66 FLAG_SET_DEFAULT(gc, false); \
67 } \
68 } while(0)
69
70 char** Arguments::_jvm_flags_array = NULL;
71 int Arguments::_num_jvm_flags = 0;
72 char** Arguments::_jvm_args_array = NULL;
73 int Arguments::_num_jvm_args = 0;
74 char* Arguments::_java_command = NULL;
75 SystemProperty* Arguments::_system_properties = NULL;
76 const char* Arguments::_gc_log_filename = NULL;
77 bool Arguments::_has_profile = false;
78 size_t Arguments::_conservative_max_heap_alignment = 0;
79 uintx Arguments::_min_heap_size = 0;
80 uintx Arguments::_min_heap_free_ratio = 0;
81 uintx Arguments::_max_heap_free_ratio = 0;
82 Arguments::Mode Arguments::_mode = _mixed;
83 bool Arguments::_java_compiler = false;
84 bool Arguments::_xdebug_mode = false;
85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
87 int Arguments::_sun_java_launcher_pid = -1;
88 bool Arguments::_sun_java_launcher_is_altjvm = false;
89
90 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
93 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
94 bool Arguments::_ClipInlining = ClipInlining;
95
96 char* Arguments::SharedArchivePath = NULL;
97
98 AgentLibraryList Arguments::_libraryList;
99 AgentLibraryList Arguments::_agentList;
100
101 abort_hook_t Arguments::_abort_hook = NULL;
102 exit_hook_t Arguments::_exit_hook = NULL;
103 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
104
105
106 SystemProperty *Arguments::_sun_boot_library_path = NULL;
107 SystemProperty *Arguments::_java_library_path = NULL;
108 SystemProperty *Arguments::_java_home = NULL;
109 SystemProperty *Arguments::_java_class_path = NULL;
110 SystemProperty *Arguments::_sun_boot_class_path = NULL;
111
112 char* Arguments::_ext_dirs = NULL;
113
114 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
115 // part of the option string.
116 static bool match_option(const JavaVMOption *option, const char* name,
117 const char** tail) {
118 int len = (int)strlen(name);
119 if (strncmp(option->optionString, name, len) == 0) {
120 *tail = option->optionString + len;
121 return true;
122 } else {
123 return false;
124 }
125 }
126
127 // Check if 'option' matches 'name'. No "tail" is allowed.
128 static bool match_option(const JavaVMOption *option, const char* name) {
129 const char* tail = NULL;
130 bool result = match_option(option, name, &tail);
131 if (tail != NULL && *tail == '\0') {
132 return result;
133 } else {
134 return false;
135 }
136 }
137
138 // Return true if any of the strings in null-terminated array 'names' matches.
139 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
140 // the option must match exactly.
141 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
142 bool tail_allowed) {
143 for (/* empty */; *names != NULL; ++names) {
144 if (match_option(option, *names, tail)) {
145 if (**tail == '\0' || tail_allowed && **tail == ':') {
146 return true;
147 }
148 }
149 }
150 return false;
151 }
152
153 static void logOption(const char* opt) {
154 if (PrintVMOptions) {
155 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
156 }
157 }
158
159 // Process java launcher properties.
160 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
161 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
162 // sun.java.launcher.pid is defined.
163 // Must do this before setting up other system properties,
164 // as some of them may depend on launcher type.
165 for (int index = 0; index < args->nOptions; index++) {
166 const JavaVMOption* option = args->options + index;
167 const char* tail;
168
169 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
170 process_java_launcher_argument(tail, option->extraInfo);
171 continue;
172 }
173 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
174 if (strcmp(tail, "true") == 0) {
175 _sun_java_launcher_is_altjvm = true;
176 }
177 continue;
178 }
179 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
180 _sun_java_launcher_pid = atoi(tail);
181 continue;
182 }
183 }
184 }
185
186 // Initialize system properties key and value.
187 void Arguments::init_system_properties() {
188
189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
190 "Java Virtual Machine Specification", false));
191 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
192 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
193 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
194
195 // Following are JVMTI agent writable properties.
196 // Properties values are set to NULL and they are
197 // os specific they are initialized in os::init_system_properties_values().
198 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
199 _java_library_path = new SystemProperty("java.library.path", NULL, true);
200 _java_home = new SystemProperty("java.home", NULL, true);
201 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
202
203 _java_class_path = new SystemProperty("java.class.path", "", true);
204
205 // Add to System Property list.
206 PropertyList_add(&_system_properties, _sun_boot_library_path);
207 PropertyList_add(&_system_properties, _java_library_path);
208 PropertyList_add(&_system_properties, _java_home);
209 PropertyList_add(&_system_properties, _java_class_path);
210 PropertyList_add(&_system_properties, _sun_boot_class_path);
211
212 // Set OS specific system properties values
213 os::init_system_properties_values();
214 }
215
216
217 // Update/Initialize System properties after JDK version number is known
218 void Arguments::init_version_specific_system_properties() {
219 enum { bufsz = 16 };
220 char buffer[bufsz];
221 const char* spec_vendor = "Sun Microsystems Inc.";
222 uint32_t spec_version = 0;
223
224 spec_vendor = "Oracle Corporation";
225 spec_version = JDK_Version::current().major_version();
226 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
227
228 PropertyList_add(&_system_properties,
229 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
230 PropertyList_add(&_system_properties,
231 new SystemProperty("java.vm.specification.version", buffer, false));
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
234 }
235
236 /**
237 * Provide a slightly more user-friendly way of eliminating -XX flags.
238 * When a flag is eliminated, it can be added to this list in order to
239 * continue accepting this flag on the command-line, while issuing a warning
240 * and ignoring the value. Once the JDK version reaches the 'accept_until'
241 * limit, we flatly refuse to admit the existence of the flag. This allows
242 * a flag to die correctly over JDK releases using HSX.
243 * But now that HSX is no longer supported only options with a future
244 * accept_until value need to be listed, and the list can be pruned
245 * on each major release.
246 */
247 typedef struct {
248 const char* name;
249 JDK_Version obsoleted_in; // when the flag went away
250 JDK_Version accept_until; // which version to start denying the existence
251 } ObsoleteFlag;
252
253 static ObsoleteFlag obsolete_jvm_flags[] = {
254 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
255 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
256 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
257 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
258 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
259 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
260 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
261 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
262 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
263 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
264 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
265 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
266 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
267 #ifndef ZERO
268 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
269 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
270 #endif // ZERO
271 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) },
272 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) },
273 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) },
274 { NULL, JDK_Version(0), JDK_Version(0) }
275 };
276
277 // Returns true if the flag is obsolete and fits into the range specified
278 // for being ignored. In the case that the flag is ignored, the 'version'
279 // value is filled in with the version number when the flag became
280 // obsolete so that that value can be displayed to the user.
281 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
282 int i = 0;
283 assert(version != NULL, "Must provide a version buffer");
284 while (obsolete_jvm_flags[i].name != NULL) {
285 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
286 // <flag>=xxx form
287 // [-|+]<flag> form
288 size_t len = strlen(flag_status.name);
289 if (((strncmp(flag_status.name, s, len) == 0) &&
290 (strlen(s) == len)) ||
291 ((s[0] == '+' || s[0] == '-') &&
292 (strncmp(flag_status.name, &s[1], len) == 0) &&
293 (strlen(&s[1]) == len))) {
294 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
295 *version = flag_status.obsoleted_in;
296 return true;
297 }
298 }
299 i++;
300 }
301 return false;
302 }
303
304 // Constructs the system class path (aka boot class path) from the following
305 // components, in order:
306 //
307 // prefix // from -Xbootclasspath/p:...
308 // base // from os::get_system_properties() or -Xbootclasspath=
309 // suffix // from -Xbootclasspath/a:...
310 //
311 // This could be AllStatic, but it isn't needed after argument processing is
312 // complete.
313 class SysClassPath: public StackObj {
314 public:
315 SysClassPath(const char* base);
316 ~SysClassPath();
317
318 inline void set_base(const char* base);
319 inline void add_prefix(const char* prefix);
320 inline void add_suffix_to_prefix(const char* suffix);
321 inline void add_suffix(const char* suffix);
322 inline void reset_path(const char* base);
323
324 inline const char* get_base() const { return _items[_scp_base]; }
325 inline const char* get_prefix() const { return _items[_scp_prefix]; }
326 inline const char* get_suffix() const { return _items[_scp_suffix]; }
327
328 // Combine all the components into a single c-heap-allocated string; caller
329 // must free the string if/when no longer needed.
330 char* combined_path();
331
332 private:
333 // Utility routines.
334 static char* add_to_path(const char* path, const char* str, bool prepend);
335 static char* add_jars_to_path(char* path, const char* directory);
336
337 inline void reset_item_at(int index);
338
339 // Array indices for the items that make up the sysclasspath. All except the
340 // base are allocated in the C heap and freed by this class.
341 enum {
342 _scp_prefix, // from -Xbootclasspath/p:...
343 _scp_base, // the default sysclasspath
344 _scp_suffix, // from -Xbootclasspath/a:...
345 _scp_nitems // the number of items, must be last.
346 };
347
348 const char* _items[_scp_nitems];
349 };
350
351 SysClassPath::SysClassPath(const char* base) {
352 memset(_items, 0, sizeof(_items));
353 _items[_scp_base] = base;
354 }
355
356 SysClassPath::~SysClassPath() {
357 // Free everything except the base.
358 for (int i = 0; i < _scp_nitems; ++i) {
359 if (i != _scp_base) reset_item_at(i);
360 }
361 }
362
363 inline void SysClassPath::set_base(const char* base) {
364 _items[_scp_base] = base;
365 }
366
367 inline void SysClassPath::add_prefix(const char* prefix) {
368 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
369 }
370
371 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
372 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
373 }
374
375 inline void SysClassPath::add_suffix(const char* suffix) {
376 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
377 }
378
379 inline void SysClassPath::reset_item_at(int index) {
380 assert(index < _scp_nitems && index != _scp_base, "just checking");
381 if (_items[index] != NULL) {
382 FREE_C_HEAP_ARRAY(char, _items[index]);
383 _items[index] = NULL;
384 }
385 }
386
387 inline void SysClassPath::reset_path(const char* base) {
388 // Clear the prefix and suffix.
389 reset_item_at(_scp_prefix);
390 reset_item_at(_scp_suffix);
391 set_base(base);
392 }
393
394 //------------------------------------------------------------------------------
395
396
397 // Combine the bootclasspath elements, some of which may be null, into a single
398 // c-heap-allocated string.
399 char* SysClassPath::combined_path() {
400 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
401
402 size_t lengths[_scp_nitems];
403 size_t total_len = 0;
404
405 const char separator = *os::path_separator();
406
407 // Get the lengths.
408 int i;
409 for (i = 0; i < _scp_nitems; ++i) {
410 if (_items[i] != NULL) {
411 lengths[i] = strlen(_items[i]);
412 // Include space for the separator char (or a NULL for the last item).
413 total_len += lengths[i] + 1;
414 }
415 }
416 assert(total_len > 0, "empty sysclasspath not allowed");
417
418 // Copy the _items to a single string.
419 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
420 char* cp_tmp = cp;
421 for (i = 0; i < _scp_nitems; ++i) {
422 if (_items[i] != NULL) {
423 memcpy(cp_tmp, _items[i], lengths[i]);
424 cp_tmp += lengths[i];
425 *cp_tmp++ = separator;
426 }
427 }
428 *--cp_tmp = '\0'; // Replace the extra separator.
429 return cp;
430 }
431
432 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
433 char*
434 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
435 char *cp;
436
437 assert(str != NULL, "just checking");
438 if (path == NULL) {
439 size_t len = strlen(str) + 1;
440 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
441 memcpy(cp, str, len); // copy the trailing null
442 } else {
443 const char separator = *os::path_separator();
444 size_t old_len = strlen(path);
445 size_t str_len = strlen(str);
446 size_t len = old_len + str_len + 2;
447
448 if (prepend) {
449 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
450 char* cp_tmp = cp;
451 memcpy(cp_tmp, str, str_len);
452 cp_tmp += str_len;
453 *cp_tmp = separator;
454 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
455 FREE_C_HEAP_ARRAY(char, path);
456 } else {
457 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
458 char* cp_tmp = cp + old_len;
459 *cp_tmp = separator;
460 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
461 }
462 }
463 return cp;
464 }
465
466 // Scan the directory and append any jar or zip files found to path.
467 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
468 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
469 DIR* dir = os::opendir(directory);
470 if (dir == NULL) return path;
471
472 char dir_sep[2] = { '\0', '\0' };
473 size_t directory_len = strlen(directory);
474 const char fileSep = *os::file_separator();
475 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
476
477 /* Scan the directory for jars/zips, appending them to path. */
478 struct dirent *entry;
479 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
480 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
481 const char* name = entry->d_name;
482 const char* ext = name + strlen(name) - 4;
483 bool isJarOrZip = ext > name &&
484 (os::file_name_strcmp(ext, ".jar") == 0 ||
485 os::file_name_strcmp(ext, ".zip") == 0);
486 if (isJarOrZip) {
487 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
488 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
489 path = add_to_path(path, jarpath, false);
490 FREE_C_HEAP_ARRAY(char, jarpath);
491 }
492 }
493 FREE_C_HEAP_ARRAY(char, dbuf);
494 os::closedir(dir);
495 return path;
496 }
497
498 // Parses a memory size specification string.
499 static bool atomull(const char *s, julong* result) {
500 julong n = 0;
501 int args_read = 0;
502 bool is_hex = false;
503 // Skip leading 0[xX] for hexadecimal
504 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
505 s += 2;
506 is_hex = true;
507 args_read = sscanf(s, JULONG_FORMAT_X, &n);
508 } else {
509 args_read = sscanf(s, JULONG_FORMAT, &n);
510 }
511 if (args_read != 1) {
512 return false;
513 }
514 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
515 s++;
516 }
517 // 4705540: illegal if more characters are found after the first non-digit
518 if (strlen(s) > 1) {
519 return false;
520 }
521 switch (*s) {
522 case 'T': case 't':
523 *result = n * G * K;
524 // Check for overflow.
525 if (*result/((julong)G * K) != n) return false;
526 return true;
527 case 'G': case 'g':
528 *result = n * G;
529 if (*result/G != n) return false;
530 return true;
531 case 'M': case 'm':
532 *result = n * M;
533 if (*result/M != n) return false;
534 return true;
535 case 'K': case 'k':
536 *result = n * K;
537 if (*result/K != n) return false;
538 return true;
539 case '\0':
540 *result = n;
541 return true;
542 default:
543 return false;
544 }
545 }
546
547 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
548 if (size < min_size) return arg_too_small;
549 // Check that size will fit in a size_t (only relevant on 32-bit)
550 if (size > max_uintx) return arg_too_big;
551 return arg_in_range;
552 }
553
554 // Describe an argument out of range error
555 void Arguments::describe_range_error(ArgsRange errcode) {
556 switch(errcode) {
557 case arg_too_big:
558 jio_fprintf(defaultStream::error_stream(),
559 "The specified size exceeds the maximum "
560 "representable size.\n");
561 break;
562 case arg_too_small:
563 case arg_unreadable:
564 case arg_in_range:
565 // do nothing for now
566 break;
567 default:
568 ShouldNotReachHere();
569 }
570 }
571
572 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
573 return CommandLineFlags::boolAtPut(name, &value, origin);
574 }
575
576 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
577 double v;
578 if (sscanf(value, "%lf", &v) != 1) {
579 return false;
580 }
581
582 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
583 return true;
584 }
585 return false;
586 }
587
588 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
589 julong v;
590 intx intx_v;
591 bool is_neg = false;
592 // Check the sign first since atomull() parses only unsigned values.
593 if (*value == '-') {
594 if (!CommandLineFlags::intxAt(name, &intx_v)) {
595 return false;
596 }
597 value++;
598 is_neg = true;
599 }
600 if (!atomull(value, &v)) {
601 return false;
602 }
603 intx_v = (intx) v;
604 if (is_neg) {
605 intx_v = -intx_v;
606 }
607 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
608 return true;
609 }
610 uintx uintx_v = (uintx) v;
611 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
612 return true;
613 }
614 uint64_t uint64_t_v = (uint64_t) v;
615 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
616 return true;
617 }
618 size_t size_t_v = (size_t) v;
619 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
620 return true;
621 }
622 return false;
623 }
624
625 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
626 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
627 // Contract: CommandLineFlags always returns a pointer that needs freeing.
628 FREE_C_HEAP_ARRAY(char, value);
629 return true;
630 }
631
632 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
633 const char* old_value = "";
634 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
635 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
636 size_t new_len = strlen(new_value);
637 const char* value;
638 char* free_this_too = NULL;
639 if (old_len == 0) {
640 value = new_value;
641 } else if (new_len == 0) {
642 value = old_value;
643 } else {
644 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
645 // each new setting adds another LINE to the switch:
646 sprintf(buf, "%s\n%s", old_value, new_value);
647 value = buf;
648 free_this_too = buf;
649 }
650 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
651 // CommandLineFlags always returns a pointer that needs freeing.
652 FREE_C_HEAP_ARRAY(char, value);
653 if (free_this_too != NULL) {
654 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
655 FREE_C_HEAP_ARRAY(char, free_this_too);
656 }
657 return true;
658 }
659
660 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
661
662 // range of acceptable characters spelled out for portability reasons
663 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
664 #define BUFLEN 255
665 char name[BUFLEN+1];
666 char dummy;
667
668 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
669 return set_bool_flag(name, false, origin);
670 }
671 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
672 return set_bool_flag(name, true, origin);
673 }
674
675 char punct;
676 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
677 const char* value = strchr(arg, '=') + 1;
678 Flag* flag = Flag::find_flag(name, strlen(name));
679 if (flag != NULL && flag->is_ccstr()) {
680 if (flag->ccstr_accumulates()) {
681 return append_to_string_flag(name, value, origin);
682 } else {
683 if (value[0] == '\0') {
684 value = NULL;
685 }
686 return set_string_flag(name, value, origin);
687 }
688 }
689 }
690
691 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
692 const char* value = strchr(arg, '=') + 1;
693 // -XX:Foo:=xxx will reset the string flag to the given value.
694 if (value[0] == '\0') {
695 value = NULL;
696 }
697 return set_string_flag(name, value, origin);
698 }
699
700 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
701 #define SIGNED_NUMBER_RANGE "[-0123456789]"
702 #define NUMBER_RANGE "[0123456789]"
703 char value[BUFLEN + 1];
704 char value2[BUFLEN + 1];
705 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
706 // Looks like a floating-point number -- try again with more lenient format string
707 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
708 return set_fp_numeric_flag(name, value, origin);
709 }
710 }
711
712 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
713 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
714 return set_numeric_flag(name, value, origin);
715 }
716
717 return false;
718 }
719
720 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
721 assert(bldarray != NULL, "illegal argument");
722
723 if (arg == NULL) {
724 return;
725 }
726
727 int new_count = *count + 1;
728
729 // expand the array and add arg to the last element
730 if (*bldarray == NULL) {
731 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
732 } else {
733 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
734 }
735 (*bldarray)[*count] = os::strdup_check_oom(arg);
736 *count = new_count;
737 }
738
739 void Arguments::build_jvm_args(const char* arg) {
740 add_string(&_jvm_args_array, &_num_jvm_args, arg);
741 }
742
743 void Arguments::build_jvm_flags(const char* arg) {
744 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
745 }
746
747 // utility function to return a string that concatenates all
748 // strings in a given char** array
749 const char* Arguments::build_resource_string(char** args, int count) {
750 if (args == NULL || count == 0) {
751 return NULL;
752 }
753 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
754 for (int i = 1; i < count; i++) {
755 length += strlen(args[i]) + 1; // add 1 for a space
756 }
757 char* s = NEW_RESOURCE_ARRAY(char, length);
758 strcpy(s, args[0]);
759 for (int j = 1; j < count; j++) {
760 strcat(s, " ");
761 strcat(s, args[j]);
762 }
763 return (const char*) s;
764 }
765
766 void Arguments::print_on(outputStream* st) {
767 st->print_cr("VM Arguments:");
768 if (num_jvm_flags() > 0) {
769 st->print("jvm_flags: "); print_jvm_flags_on(st);
770 }
771 if (num_jvm_args() > 0) {
772 st->print("jvm_args: "); print_jvm_args_on(st);
773 }
774 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
775 if (_java_class_path != NULL) {
776 char* path = _java_class_path->value();
777 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
778 }
779 st->print_cr("Launcher Type: %s", _sun_java_launcher);
780 }
781
782 void Arguments::print_jvm_flags_on(outputStream* st) {
783 if (_num_jvm_flags > 0) {
784 for (int i=0; i < _num_jvm_flags; i++) {
785 st->print("%s ", _jvm_flags_array[i]);
786 }
787 st->cr();
788 }
789 }
790
791 void Arguments::print_jvm_args_on(outputStream* st) {
792 if (_num_jvm_args > 0) {
793 for (int i=0; i < _num_jvm_args; i++) {
794 st->print("%s ", _jvm_args_array[i]);
795 }
796 st->cr();
797 }
798 }
799
800 bool Arguments::process_argument(const char* arg,
801 jboolean ignore_unrecognized, Flag::Flags origin) {
802
803 JDK_Version since = JDK_Version();
804
805 if (parse_argument(arg, origin) || ignore_unrecognized) {
806 return true;
807 }
808
809 bool has_plus_minus = (*arg == '+' || *arg == '-');
810 const char* const argname = has_plus_minus ? arg + 1 : arg;
811 if (is_newly_obsolete(arg, &since)) {
812 char version[256];
813 since.to_string(version, sizeof(version));
814 warning("ignoring option %s; support was removed in %s", argname, version);
815 return true;
816 }
817
818 // For locked flags, report a custom error message if available.
819 // Otherwise, report the standard unrecognized VM option.
820
821 size_t arg_len;
822 const char* equal_sign = strchr(argname, '=');
823 if (equal_sign == NULL) {
824 arg_len = strlen(argname);
825 } else {
826 arg_len = equal_sign - argname;
827 }
828
829 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
830 if (found_flag != NULL) {
831 char locked_message_buf[BUFLEN];
832 found_flag->get_locked_message(locked_message_buf, BUFLEN);
833 if (strlen(locked_message_buf) == 0) {
834 if (found_flag->is_bool() && !has_plus_minus) {
835 jio_fprintf(defaultStream::error_stream(),
836 "Missing +/- setting for VM option '%s'\n", argname);
837 } else if (!found_flag->is_bool() && has_plus_minus) {
838 jio_fprintf(defaultStream::error_stream(),
839 "Unexpected +/- setting in VM option '%s'\n", argname);
840 } else {
841 jio_fprintf(defaultStream::error_stream(),
842 "Improperly specified VM option '%s'\n", argname);
843 }
844 } else {
845 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
846 }
847 } else {
848 jio_fprintf(defaultStream::error_stream(),
849 "Unrecognized VM option '%s'\n", argname);
850 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
851 if (fuzzy_matched != NULL) {
852 jio_fprintf(defaultStream::error_stream(),
853 "Did you mean '%s%s%s'? ",
854 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
855 fuzzy_matched->_name,
856 (fuzzy_matched->is_bool()) ? "" : "=<value>");
857 if (is_newly_obsolete(fuzzy_matched->_name, &since)) {
858 char version[256];
859 since.to_string(version, sizeof(version));
860 jio_fprintf(defaultStream::error_stream(),
861 "Warning: support for %s was removed in %s\n",
862 fuzzy_matched->_name,
863 version);
864 }
865 }
866 }
867
868 // allow for commandline "commenting out" options like -XX:#+Verbose
869 return arg[0] == '#';
870 }
871
872 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
873 FILE* stream = fopen(file_name, "rb");
874 if (stream == NULL) {
875 if (should_exist) {
876 jio_fprintf(defaultStream::error_stream(),
877 "Could not open settings file %s\n", file_name);
878 return false;
879 } else {
880 return true;
881 }
882 }
883
884 char token[1024];
885 int pos = 0;
886
887 bool in_white_space = true;
888 bool in_comment = false;
889 bool in_quote = false;
890 char quote_c = 0;
891 bool result = true;
892
893 int c = getc(stream);
894 while(c != EOF && pos < (int)(sizeof(token)-1)) {
895 if (in_white_space) {
896 if (in_comment) {
897 if (c == '\n') in_comment = false;
898 } else {
899 if (c == '#') in_comment = true;
900 else if (!isspace(c)) {
901 in_white_space = false;
902 token[pos++] = c;
903 }
904 }
905 } else {
906 if (c == '\n' || (!in_quote && isspace(c))) {
907 // token ends at newline, or at unquoted whitespace
908 // this allows a way to include spaces in string-valued options
909 token[pos] = '\0';
910 logOption(token);
911 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
912 build_jvm_flags(token);
913 pos = 0;
914 in_white_space = true;
915 in_quote = false;
916 } else if (!in_quote && (c == '\'' || c == '"')) {
917 in_quote = true;
918 quote_c = c;
919 } else if (in_quote && (c == quote_c)) {
920 in_quote = false;
921 } else {
922 token[pos++] = c;
923 }
924 }
925 c = getc(stream);
926 }
927 if (pos > 0) {
928 token[pos] = '\0';
929 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
930 build_jvm_flags(token);
931 }
932 fclose(stream);
933 return result;
934 }
935
936 //=============================================================================================================
937 // Parsing of properties (-D)
938
939 const char* Arguments::get_property(const char* key) {
940 return PropertyList_get_value(system_properties(), key);
941 }
942
943 bool Arguments::add_property(const char* prop) {
944 const char* eq = strchr(prop, '=');
945 char* key;
946 // ns must be static--its address may be stored in a SystemProperty object.
947 const static char ns[1] = {0};
948 char* value = (char *)ns;
949
950 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
951 key = AllocateHeap(key_len + 1, mtInternal);
952 strncpy(key, prop, key_len);
953 key[key_len] = '\0';
954
955 if (eq != NULL) {
956 size_t value_len = strlen(prop) - key_len - 1;
957 value = AllocateHeap(value_len + 1, mtInternal);
958 strncpy(value, &prop[key_len + 1], value_len + 1);
959 }
960
961 if (strcmp(key, "java.compiler") == 0) {
962 process_java_compiler_argument(value);
963 FreeHeap(key);
964 if (eq != NULL) {
965 FreeHeap(value);
966 }
967 return true;
968 } else if (strcmp(key, "sun.java.command") == 0) {
969 _java_command = value;
970
971 // Record value in Arguments, but let it get passed to Java.
972 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
973 strcmp(key, "sun.java.launcher.pid") == 0) {
974 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
975 // private and are processed in process_sun_java_launcher_properties();
976 // the sun.java.launcher property is passed on to the java application
977 FreeHeap(key);
978 if (eq != NULL) {
979 FreeHeap(value);
980 }
981 return true;
982 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
983 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
984 // its value without going through the property list or making a Java call.
985 _java_vendor_url_bug = value;
986 } else if (strcmp(key, "sun.boot.library.path") == 0) {
987 PropertyList_unique_add(&_system_properties, key, value, true);
988 return true;
989 }
990 // Create new property and add at the end of the list
991 PropertyList_unique_add(&_system_properties, key, value);
992 return true;
993 }
994
995 //===========================================================================================================
996 // Setting int/mixed/comp mode flags
997
998 void Arguments::set_mode_flags(Mode mode) {
999 // Set up default values for all flags.
1000 // If you add a flag to any of the branches below,
1001 // add a default value for it here.
1002 set_java_compiler(false);
1003 _mode = mode;
1004
1005 // Ensure Agent_OnLoad has the correct initial values.
1006 // This may not be the final mode; mode may change later in onload phase.
1007 PropertyList_unique_add(&_system_properties, "java.vm.info",
1008 (char*)VM_Version::vm_info_string(), false);
1009
1010 UseInterpreter = true;
1011 UseCompiler = true;
1012 UseLoopCounter = true;
1013
1014 // Default values may be platform/compiler dependent -
1015 // use the saved values
1016 ClipInlining = Arguments::_ClipInlining;
1017 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1018 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1019 BackgroundCompilation = Arguments::_BackgroundCompilation;
1020
1021 // Change from defaults based on mode
1022 switch (mode) {
1023 default:
1024 ShouldNotReachHere();
1025 break;
1026 case _int:
1027 UseCompiler = false;
1028 UseLoopCounter = false;
1029 AlwaysCompileLoopMethods = false;
1030 UseOnStackReplacement = false;
1031 break;
1032 case _mixed:
1033 // same as default
1034 break;
1035 case _comp:
1036 UseInterpreter = false;
1037 BackgroundCompilation = false;
1038 ClipInlining = false;
1039 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1040 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1041 // compile a level 4 (C2) and then continue executing it.
1042 if (TieredCompilation) {
1043 Tier3InvokeNotifyFreqLog = 0;
1044 Tier4InvocationThreshold = 0;
1045 }
1046 break;
1047 }
1048 }
1049
1050 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1051 // Conflict: required to use shared spaces (-Xshare:on), but
1052 // incompatible command line options were chosen.
1053
1054 static void no_shared_spaces(const char* message) {
1055 if (RequireSharedSpaces) {
1056 jio_fprintf(defaultStream::error_stream(),
1057 "Class data sharing is inconsistent with other specified options.\n");
1058 vm_exit_during_initialization("Unable to use shared archive.", message);
1059 } else {
1060 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1061 }
1062 }
1063 #endif
1064
1065 // Returns threshold scaled with the value of scale.
1066 // If scale < 0.0, threshold is returned without scaling.
1067 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1068 if (scale == 1.0 || scale < 0.0) {
1069 return threshold;
1070 } else {
1071 return (intx)(threshold * scale);
1072 }
1073 }
1074
1075 // Returns freq_log scaled with the value of scale.
1076 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1077 // If scale < 0.0, freq_log is returned without scaling.
1078 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1079 // Check if scaling is necessary or if negative value was specified.
1080 if (scale == 1.0 || scale < 0.0) {
1081 return freq_log;
1082 }
1083 // Check values to avoid calculating log2 of 0.
1084 if (scale == 0.0 || freq_log == 0) {
1085 return 0;
1086 }
1087 // Determine the maximum notification frequency value currently supported.
1088 // The largest mask value that the interpreter/C1 can handle is
1089 // of length InvocationCounter::number_of_count_bits. Mask values are always
1090 // one bit shorter then the value of the notification frequency. Set
1091 // max_freq_bits accordingly.
1092 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1093 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1094 if (scaled_freq == 0) {
1095 // Return 0 right away to avoid calculating log2 of 0.
1096 return 0;
1097 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1098 return max_freq_bits;
1099 } else {
1100 return log2_intptr(scaled_freq);
1101 }
1102 }
1103
1104 void Arguments::set_tiered_flags() {
1105 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1106 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1107 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1108 }
1109 if (CompilationPolicyChoice < 2) {
1110 vm_exit_during_initialization(
1111 "Incompatible compilation policy selected", NULL);
1112 }
1113 // Increase the code cache size - tiered compiles a lot more.
1114 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1115 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1116 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1117 }
1118 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1119 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1120 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1121
1122 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1123 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1124 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1125 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1126 }
1127 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1128 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1129 }
1130 // Check consistency of code heap sizes
1131 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1132 jio_fprintf(defaultStream::error_stream(),
1133 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1134 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1135 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1136 vm_exit(1);
1137 }
1138 }
1139 }
1140 if (!UseInterpreter) { // -Xcomp
1141 Tier3InvokeNotifyFreqLog = 0;
1142 Tier4InvocationThreshold = 0;
1143 }
1144
1145 if (CompileThresholdScaling < 0) {
1146 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1147 }
1148
1149 // Scale tiered compilation thresholds.
1150 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1151 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1152 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1153 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1154
1155 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1156 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1157 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1158 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1159
1160 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1161 // once these thresholds become supported.
1162
1163 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1164 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1165
1166 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1167 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1168
1169 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1170
1171 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1172 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1173 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1174 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1175 }
1176 }
1177
1178 /**
1179 * Returns the minimum number of compiler threads needed to run the JVM. The following
1180 * configurations are possible.
1181 *
1182 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1183 * compiler threads is 0.
1184 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1185 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1186 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1187 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1188 * C1 can be used, so the minimum number of compiler threads is 1.
1189 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1190 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1191 * the minimum number of compiler threads is 2.
1192 */
1193 int Arguments::get_min_number_of_compiler_threads() {
1194 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1195 return 0; // case 1
1196 #else
1197 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1198 return 1; // case 2 or case 3
1199 }
1200 return 2; // case 4 (tiered)
1201 #endif
1202 }
1203
1204 #if INCLUDE_ALL_GCS
1205 static void disable_adaptive_size_policy(const char* collector_name) {
1206 if (UseAdaptiveSizePolicy) {
1207 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1208 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1209 collector_name);
1210 }
1211 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1212 }
1213 }
1214
1215 void Arguments::set_parnew_gc_flags() {
1216 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1217 "control point invariant");
1218 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1219 assert(UseParNewGC, "ParNew should always be used with CMS");
1220
1221 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1222 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1223 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1224 } else if (ParallelGCThreads == 0) {
1225 jio_fprintf(defaultStream::error_stream(),
1226 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1227 vm_exit(1);
1228 }
1229
1230 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1231 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1232 // we set them to 1024 and 1024.
1233 // See CR 6362902.
1234 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1235 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1236 }
1237 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1238 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1239 }
1240
1241 // When using compressed oops, we use local overflow stacks,
1242 // rather than using a global overflow list chained through
1243 // the klass word of the object's pre-image.
1244 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1245 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1246 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1247 }
1248 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1249 }
1250 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1251 }
1252
1253 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1254 // sparc/solaris for certain applications, but would gain from
1255 // further optimization and tuning efforts, and would almost
1256 // certainly gain from analysis of platform and environment.
1257 void Arguments::set_cms_and_parnew_gc_flags() {
1258 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1259 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1260 assert(UseParNewGC, "ParNew should always be used with CMS");
1261
1262 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1263 disable_adaptive_size_policy("UseConcMarkSweepGC");
1264
1265 set_parnew_gc_flags();
1266
1267 size_t max_heap = align_size_down(MaxHeapSize,
1268 CardTableRS::ct_max_alignment_constraint());
1269
1270 // Now make adjustments for CMS
1271 intx tenuring_default = (intx)6;
1272 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1273
1274 // Preferred young gen size for "short" pauses:
1275 // upper bound depends on # of threads and NewRatio.
1276 const uintx parallel_gc_threads =
1277 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1278 const size_t preferred_max_new_size_unaligned =
1279 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1280 size_t preferred_max_new_size =
1281 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1282
1283 // Unless explicitly requested otherwise, size young gen
1284 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1285
1286 // If either MaxNewSize or NewRatio is set on the command line,
1287 // assume the user is trying to set the size of the young gen.
1288 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1289
1290 // Set MaxNewSize to our calculated preferred_max_new_size unless
1291 // NewSize was set on the command line and it is larger than
1292 // preferred_max_new_size.
1293 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1294 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1295 } else {
1296 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1297 }
1298 if (PrintGCDetails && Verbose) {
1299 // Too early to use gclog_or_tty
1300 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1301 }
1302
1303 // Code along this path potentially sets NewSize and OldSize
1304 if (PrintGCDetails && Verbose) {
1305 // Too early to use gclog_or_tty
1306 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1307 " initial_heap_size: " SIZE_FORMAT
1308 " max_heap: " SIZE_FORMAT,
1309 min_heap_size(), InitialHeapSize, max_heap);
1310 }
1311 size_t min_new = preferred_max_new_size;
1312 if (FLAG_IS_CMDLINE(NewSize)) {
1313 min_new = NewSize;
1314 }
1315 if (max_heap > min_new && min_heap_size() > min_new) {
1316 // Unless explicitly requested otherwise, make young gen
1317 // at least min_new, and at most preferred_max_new_size.
1318 if (FLAG_IS_DEFAULT(NewSize)) {
1319 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1320 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1321 if (PrintGCDetails && Verbose) {
1322 // Too early to use gclog_or_tty
1323 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1324 }
1325 }
1326 // Unless explicitly requested otherwise, size old gen
1327 // so it's NewRatio x of NewSize.
1328 if (FLAG_IS_DEFAULT(OldSize)) {
1329 if (max_heap > NewSize) {
1330 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1331 if (PrintGCDetails && Verbose) {
1332 // Too early to use gclog_or_tty
1333 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1334 }
1335 }
1336 }
1337 }
1338 }
1339 // Unless explicitly requested otherwise, definitely
1340 // promote all objects surviving "tenuring_default" scavenges.
1341 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1342 FLAG_IS_DEFAULT(SurvivorRatio)) {
1343 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1344 }
1345 // If we decided above (or user explicitly requested)
1346 // `promote all' (via MaxTenuringThreshold := 0),
1347 // prefer minuscule survivor spaces so as not to waste
1348 // space for (non-existent) survivors
1349 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1350 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1351 }
1352
1353 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1354 // but rather the number of free blocks of a given size that are used when
1355 // replenishing the local per-worker free list caches.
1356 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1357 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1358 // OldPLAB sizing manually turned off: Use a larger default setting,
1359 // unless it was manually specified. This is because a too-low value
1360 // will slow down scavenges.
1361 FLAG_SET_ERGO(uintx, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1362 } else {
1363 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1364 }
1365 }
1366
1367 // If either of the static initialization defaults have changed, note this
1368 // modification.
1369 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1370 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1371 }
1372 if (PrintGCDetails && Verbose) {
1373 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1374 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1375 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1376 }
1377 }
1378 #endif // INCLUDE_ALL_GCS
1379
1380 void set_object_alignment() {
1381 // Object alignment.
1382 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1383 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1384 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1385 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1386 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1387 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1388
1389 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1390 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1391
1392 // Oop encoding heap max
1393 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1394
1395 #if INCLUDE_ALL_GCS
1396 // Set CMS global values
1397 CompactibleFreeListSpace::set_cms_values();
1398 #endif // INCLUDE_ALL_GCS
1399 }
1400
1401 bool verify_object_alignment() {
1402 // Object alignment.
1403 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1404 jio_fprintf(defaultStream::error_stream(),
1405 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1406 (int)ObjectAlignmentInBytes);
1407 return false;
1408 }
1409 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1410 jio_fprintf(defaultStream::error_stream(),
1411 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1412 (int)ObjectAlignmentInBytes, BytesPerLong);
1413 return false;
1414 }
1415 // It does not make sense to have big object alignment
1416 // since a space lost due to alignment will be greater
1417 // then a saved space from compressed oops.
1418 if ((int)ObjectAlignmentInBytes > 256) {
1419 jio_fprintf(defaultStream::error_stream(),
1420 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1421 (int)ObjectAlignmentInBytes);
1422 return false;
1423 }
1424 // In case page size is very small.
1425 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1426 jio_fprintf(defaultStream::error_stream(),
1427 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1428 (int)ObjectAlignmentInBytes, os::vm_page_size());
1429 return false;
1430 }
1431 if(SurvivorAlignmentInBytes == 0) {
1432 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1433 } else {
1434 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1435 jio_fprintf(defaultStream::error_stream(),
1436 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1437 (int)SurvivorAlignmentInBytes);
1438 return false;
1439 }
1440 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1441 jio_fprintf(defaultStream::error_stream(),
1442 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1443 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1444 return false;
1445 }
1446 }
1447 return true;
1448 }
1449
1450 size_t Arguments::max_heap_for_compressed_oops() {
1451 // Avoid sign flip.
1452 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1453 // We need to fit both the NULL page and the heap into the memory budget, while
1454 // keeping alignment constraints of the heap. To guarantee the latter, as the
1455 // NULL page is located before the heap, we pad the NULL page to the conservative
1456 // maximum alignment that the GC may ever impose upon the heap.
1457 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1458 _conservative_max_heap_alignment);
1459
1460 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1461 NOT_LP64(ShouldNotReachHere(); return 0);
1462 }
1463
1464 bool Arguments::should_auto_select_low_pause_collector() {
1465 if (UseAutoGCSelectPolicy &&
1466 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1467 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1468 if (PrintGCDetails) {
1469 // Cannot use gclog_or_tty yet.
1470 tty->print_cr("Automatic selection of the low pause collector"
1471 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1472 }
1473 return true;
1474 }
1475 return false;
1476 }
1477
1478 void Arguments::set_use_compressed_oops() {
1479 #ifndef ZERO
1480 #ifdef _LP64
1481 // MaxHeapSize is not set up properly at this point, but
1482 // the only value that can override MaxHeapSize if we are
1483 // to use UseCompressedOops is InitialHeapSize.
1484 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1485
1486 if (max_heap_size <= max_heap_for_compressed_oops()) {
1487 #if !defined(COMPILER1) || defined(TIERED)
1488 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1489 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1490 }
1491 #endif
1492 } else {
1493 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1494 warning("Max heap size too large for Compressed Oops");
1495 FLAG_SET_DEFAULT(UseCompressedOops, false);
1496 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1497 }
1498 }
1499 #endif // _LP64
1500 #endif // ZERO
1501 }
1502
1503
1504 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1505 // set_use_compressed_oops().
1506 void Arguments::set_use_compressed_klass_ptrs() {
1507 #ifndef ZERO
1508 #ifdef _LP64
1509 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1510 if (!UseCompressedOops) {
1511 if (UseCompressedClassPointers) {
1512 warning("UseCompressedClassPointers requires UseCompressedOops");
1513 }
1514 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1515 } else {
1516 // Turn on UseCompressedClassPointers too
1517 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1518 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1519 }
1520 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1521 if (UseCompressedClassPointers) {
1522 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1523 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1524 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1525 }
1526 }
1527 }
1528 #endif // _LP64
1529 #endif // !ZERO
1530 }
1531
1532 void Arguments::set_conservative_max_heap_alignment() {
1533 // The conservative maximum required alignment for the heap is the maximum of
1534 // the alignments imposed by several sources: any requirements from the heap
1535 // itself, the collector policy and the maximum page size we may run the VM
1536 // with.
1537 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1538 #if INCLUDE_ALL_GCS
1539 if (UseParallelGC) {
1540 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1541 } else if (UseG1GC) {
1542 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1543 }
1544 #endif // INCLUDE_ALL_GCS
1545 _conservative_max_heap_alignment = MAX4(heap_alignment,
1546 (size_t)os::vm_allocation_granularity(),
1547 os::max_page_size(),
1548 CollectorPolicy::compute_heap_alignment());
1549 }
1550
1551 void Arguments::select_gc_ergonomically() {
1552 if (os::is_server_class_machine()) {
1553 if (should_auto_select_low_pause_collector()) {
1554 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1555 } else {
1556 FLAG_SET_ERGO(bool, UseParallelGC, true);
1557 }
1558 }
1559 }
1560
1561 void Arguments::select_gc() {
1562 if (!gc_selected()) {
1563 ArgumentsExt::select_gc_ergonomically();
1564 }
1565 }
1566
1567 void Arguments::set_ergonomics_flags() {
1568 select_gc();
1569
1570 #ifdef COMPILER2
1571 // Shared spaces work fine with other GCs but causes bytecode rewriting
1572 // to be disabled, which hurts interpreter performance and decreases
1573 // server performance. When -server is specified, keep the default off
1574 // unless it is asked for. Future work: either add bytecode rewriting
1575 // at link time, or rewrite bytecodes in non-shared methods.
1576 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1577 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1578 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1579 }
1580 #endif
1581
1582 set_conservative_max_heap_alignment();
1583
1584 #ifndef ZERO
1585 #ifdef _LP64
1586 set_use_compressed_oops();
1587
1588 // set_use_compressed_klass_ptrs() must be called after calling
1589 // set_use_compressed_oops().
1590 set_use_compressed_klass_ptrs();
1591
1592 // Also checks that certain machines are slower with compressed oops
1593 // in vm_version initialization code.
1594 #endif // _LP64
1595 #endif // !ZERO
1596 }
1597
1598 void Arguments::set_parallel_gc_flags() {
1599 assert(UseParallelGC || UseParallelOldGC, "Error");
1600 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1601 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1602 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1603 }
1604 FLAG_SET_DEFAULT(UseParallelGC, true);
1605
1606 // If no heap maximum was requested explicitly, use some reasonable fraction
1607 // of the physical memory, up to a maximum of 1GB.
1608 FLAG_SET_DEFAULT(ParallelGCThreads,
1609 Abstract_VM_Version::parallel_worker_threads());
1610 if (ParallelGCThreads == 0) {
1611 jio_fprintf(defaultStream::error_stream(),
1612 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1613 vm_exit(1);
1614 }
1615
1616 if (UseAdaptiveSizePolicy) {
1617 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1618 // unless the user actually sets these flags.
1619 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1620 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1621 _min_heap_free_ratio = MinHeapFreeRatio;
1622 }
1623 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1624 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1625 _max_heap_free_ratio = MaxHeapFreeRatio;
1626 }
1627 }
1628
1629 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1630 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1631 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1632 // See CR 6362902 for details.
1633 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1634 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1635 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1636 }
1637 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1638 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1639 }
1640 }
1641
1642 if (UseParallelOldGC) {
1643 // Par compact uses lower default values since they are treated as
1644 // minimums. These are different defaults because of the different
1645 // interpretation and are not ergonomically set.
1646 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1647 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1648 }
1649 }
1650 }
1651
1652 void Arguments::set_g1_gc_flags() {
1653 assert(UseG1GC, "Error");
1654 #ifdef COMPILER1
1655 FastTLABRefill = false;
1656 #endif
1657 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1658 if (ParallelGCThreads == 0) {
1659 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1660 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1661 }
1662
1663 #if INCLUDE_ALL_GCS
1664 if (G1ConcRefinementThreads == 0) {
1665 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1666 }
1667 #endif
1668
1669 // MarkStackSize will be set (if it hasn't been set by the user)
1670 // when concurrent marking is initialized.
1671 // Its value will be based upon the number of parallel marking threads.
1672 // But we do set the maximum mark stack size here.
1673 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1674 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1675 }
1676
1677 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1678 // In G1, we want the default GC overhead goal to be higher than
1679 // say in PS. So we set it here to 10%. Otherwise the heap might
1680 // be expanded more aggressively than we would like it to. In
1681 // fact, even 10% seems to not be high enough in some cases
1682 // (especially small GC stress tests that the main thing they do
1683 // is allocation). We might consider increase it further.
1684 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1685 }
1686
1687 if (PrintGCDetails && Verbose) {
1688 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1689 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1690 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1691 }
1692 }
1693
1694 #if !INCLUDE_ALL_GCS
1695 #ifdef ASSERT
1696 static bool verify_serial_gc_flags() {
1697 return (UseSerialGC &&
1698 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1699 UseParallelGC || UseParallelOldGC));
1700 }
1701 #endif // ASSERT
1702 #endif // INCLUDE_ALL_GCS
1703
1704 void Arguments::set_gc_specific_flags() {
1705 #if INCLUDE_ALL_GCS
1706 // Set per-collector flags
1707 if (UseParallelGC || UseParallelOldGC) {
1708 set_parallel_gc_flags();
1709 } else if (UseConcMarkSweepGC) {
1710 set_cms_and_parnew_gc_flags();
1711 } else if (UseG1GC) {
1712 set_g1_gc_flags();
1713 }
1714 check_deprecated_gc_flags();
1715 if (AssumeMP && !UseSerialGC) {
1716 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1717 warning("If the number of processors is expected to increase from one, then"
1718 " you should configure the number of parallel GC threads appropriately"
1719 " using -XX:ParallelGCThreads=N");
1720 }
1721 }
1722 if (MinHeapFreeRatio == 100) {
1723 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1724 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1725 }
1726 #else // INCLUDE_ALL_GCS
1727 assert(verify_serial_gc_flags(), "SerialGC unset");
1728 #endif // INCLUDE_ALL_GCS
1729 }
1730
1731 julong Arguments::limit_by_allocatable_memory(julong limit) {
1732 julong max_allocatable;
1733 julong result = limit;
1734 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1735 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1736 }
1737 return result;
1738 }
1739
1740 // Use static initialization to get the default before parsing
1741 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1742
1743 void Arguments::set_heap_size() {
1744 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1745 // Deprecated flag
1746 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1747 }
1748
1749 const julong phys_mem =
1750 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1751 : (julong)MaxRAM;
1752
1753 // If the maximum heap size has not been set with -Xmx,
1754 // then set it as fraction of the size of physical memory,
1755 // respecting the maximum and minimum sizes of the heap.
1756 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1757 julong reasonable_max = phys_mem / MaxRAMFraction;
1758
1759 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1760 // Small physical memory, so use a minimum fraction of it for the heap
1761 reasonable_max = phys_mem / MinRAMFraction;
1762 } else {
1763 // Not-small physical memory, so require a heap at least
1764 // as large as MaxHeapSize
1765 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1766 }
1767 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1768 // Limit the heap size to ErgoHeapSizeLimit
1769 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1770 }
1771 if (UseCompressedOops) {
1772 // Limit the heap size to the maximum possible when using compressed oops
1773 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1774
1775 // HeapBaseMinAddress can be greater than default but not less than.
1776 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1777 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1778 // matches compressed oops printing flags
1779 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1780 jio_fprintf(defaultStream::error_stream(),
1781 "HeapBaseMinAddress must be at least " UINTX_FORMAT
1782 " (" UINTX_FORMAT "G) which is greater than value given "
1783 UINTX_FORMAT "\n",
1784 DefaultHeapBaseMinAddress,
1785 DefaultHeapBaseMinAddress/G,
1786 HeapBaseMinAddress);
1787 }
1788 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1789 }
1790 }
1791
1792 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1793 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1794 // but it should be not less than default MaxHeapSize.
1795 max_coop_heap -= HeapBaseMinAddress;
1796 }
1797 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1798 }
1799 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1800
1801 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1802 // An initial heap size was specified on the command line,
1803 // so be sure that the maximum size is consistent. Done
1804 // after call to limit_by_allocatable_memory because that
1805 // method might reduce the allocation size.
1806 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1807 }
1808
1809 if (PrintGCDetails && Verbose) {
1810 // Cannot use gclog_or_tty yet.
1811 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1812 }
1813 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1814 }
1815
1816 // If the minimum or initial heap_size have not been set or requested to be set
1817 // ergonomically, set them accordingly.
1818 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1819 julong reasonable_minimum = (julong)(OldSize + NewSize);
1820
1821 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1822
1823 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1824
1825 if (InitialHeapSize == 0) {
1826 julong reasonable_initial = phys_mem / InitialRAMFraction;
1827
1828 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1829 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1830
1831 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1832
1833 if (PrintGCDetails && Verbose) {
1834 // Cannot use gclog_or_tty yet.
1835 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1836 }
1837 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1838 }
1839 // If the minimum heap size has not been set (via -Xms),
1840 // synchronize with InitialHeapSize to avoid errors with the default value.
1841 if (min_heap_size() == 0) {
1842 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1843 if (PrintGCDetails && Verbose) {
1844 // Cannot use gclog_or_tty yet.
1845 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1846 }
1847 }
1848 }
1849 }
1850
1851 // This must be called after ergonomics because we want bytecode rewriting
1852 // if the server compiler is used, or if UseSharedSpaces is disabled.
1853 void Arguments::set_bytecode_flags() {
1854 // Better not attempt to store into a read-only space.
1855 if (UseSharedSpaces) {
1856 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1857 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1858 }
1859
1860 if (!RewriteBytecodes) {
1861 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1862 }
1863 }
1864
1865 // Aggressive optimization flags -XX:+AggressiveOpts
1866 void Arguments::set_aggressive_opts_flags() {
1867 #ifdef COMPILER2
1868 if (AggressiveUnboxing) {
1869 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1870 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1871 } else if (!EliminateAutoBox) {
1872 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1873 AggressiveUnboxing = false;
1874 }
1875 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1876 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1877 } else if (!DoEscapeAnalysis) {
1878 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1879 AggressiveUnboxing = false;
1880 }
1881 }
1882 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1883 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1884 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1885 }
1886 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1887 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1888 }
1889
1890 // Feed the cache size setting into the JDK
1891 char buffer[1024];
1892 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1893 add_property(buffer);
1894 }
1895 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1896 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1897 }
1898 #endif
1899
1900 if (AggressiveOpts) {
1901 // Sample flag setting code
1902 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1903 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1904 // }
1905 }
1906 }
1907
1908 //===========================================================================================================
1909 // Parsing of java.compiler property
1910
1911 void Arguments::process_java_compiler_argument(char* arg) {
1912 // For backwards compatibility, Djava.compiler=NONE or ""
1913 // causes us to switch to -Xint mode UNLESS -Xdebug
1914 // is also specified.
1915 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1916 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1917 }
1918 }
1919
1920 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1921 _sun_java_launcher = os::strdup_check_oom(launcher);
1922 }
1923
1924 bool Arguments::created_by_java_launcher() {
1925 assert(_sun_java_launcher != NULL, "property must have value");
1926 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1927 }
1928
1929 bool Arguments::sun_java_launcher_is_altjvm() {
1930 return _sun_java_launcher_is_altjvm;
1931 }
1932
1933 //===========================================================================================================
1934 // Parsing of main arguments
1935
1936 bool Arguments::verify_interval(uintx val, uintx min,
1937 uintx max, const char* name) {
1938 // Returns true iff value is in the inclusive interval [min..max]
1939 // false, otherwise.
1940 if (val >= min && val <= max) {
1941 return true;
1942 }
1943 jio_fprintf(defaultStream::error_stream(),
1944 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1945 " and " UINTX_FORMAT "\n",
1946 name, val, min, max);
1947 return false;
1948 }
1949
1950 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1951 // Returns true if given value is at least specified min threshold
1952 // false, otherwise.
1953 if (val >= min ) {
1954 return true;
1955 }
1956 jio_fprintf(defaultStream::error_stream(),
1957 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1958 name, val, min);
1959 return false;
1960 }
1961
1962 bool Arguments::verify_percentage(uintx value, const char* name) {
1963 if (is_percentage(value)) {
1964 return true;
1965 }
1966 jio_fprintf(defaultStream::error_stream(),
1967 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1968 name, value);
1969 return false;
1970 }
1971
1972 // check if do gclog rotation
1973 // +UseGCLogFileRotation is a must,
1974 // no gc log rotation when log file not supplied or
1975 // NumberOfGCLogFiles is 0
1976 void check_gclog_consistency() {
1977 if (UseGCLogFileRotation) {
1978 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1979 jio_fprintf(defaultStream::output_stream(),
1980 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1981 "where num_of_file > 0\n"
1982 "GC log rotation is turned off\n");
1983 UseGCLogFileRotation = false;
1984 }
1985 }
1986
1987 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1988 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1989 jio_fprintf(defaultStream::output_stream(),
1990 "GCLogFileSize changed to minimum 8K\n");
1991 }
1992 }
1993
1994 // This function is called for -Xloggc:<filename>, it can be used
1995 // to check if a given file name(or string) conforms to the following
1996 // specification:
1997 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1998 // %p and %t only allowed once. We only limit usage of filename not path
1999 bool is_filename_valid(const char *file_name) {
2000 const char* p = file_name;
2001 char file_sep = os::file_separator()[0];
2002 const char* cp;
2003 // skip prefix path
2004 for (cp = file_name; *cp != '\0'; cp++) {
2005 if (*cp == '/' || *cp == file_sep) {
2006 p = cp + 1;
2007 }
2008 }
2009
2010 int count_p = 0;
2011 int count_t = 0;
2012 while (*p != '\0') {
2013 if ((*p >= '0' && *p <= '9') ||
2014 (*p >= 'A' && *p <= 'Z') ||
2015 (*p >= 'a' && *p <= 'z') ||
2016 *p == '-' ||
2017 *p == '_' ||
2018 *p == '.') {
2019 p++;
2020 continue;
2021 }
2022 if (*p == '%') {
2023 if(*(p + 1) == 'p') {
2024 p += 2;
2025 count_p ++;
2026 continue;
2027 }
2028 if (*(p + 1) == 't') {
2029 p += 2;
2030 count_t ++;
2031 continue;
2032 }
2033 }
2034 return false;
2035 }
2036 return count_p < 2 && count_t < 2;
2037 }
2038
2039 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2040 if (!is_percentage(min_heap_free_ratio)) {
2041 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2042 return false;
2043 }
2044 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2045 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2046 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2047 MaxHeapFreeRatio);
2048 return false;
2049 }
2050 // This does not set the flag itself, but stores the value in a safe place for later usage.
2051 _min_heap_free_ratio = min_heap_free_ratio;
2052 return true;
2053 }
2054
2055 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2056 if (!is_percentage(max_heap_free_ratio)) {
2057 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2058 return false;
2059 }
2060 if (max_heap_free_ratio < MinHeapFreeRatio) {
2061 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2062 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2063 MinHeapFreeRatio);
2064 return false;
2065 }
2066 // This does not set the flag itself, but stores the value in a safe place for later usage.
2067 _max_heap_free_ratio = max_heap_free_ratio;
2068 return true;
2069 }
2070
2071 // Check consistency of GC selection
2072 bool Arguments::check_gc_consistency_user() {
2073 check_gclog_consistency();
2074 // Ensure that the user has not selected conflicting sets
2075 // of collectors.
2076 uint i = 0;
2077 if (UseSerialGC) i++;
2078 if (UseConcMarkSweepGC) i++;
2079 if (UseParallelGC || UseParallelOldGC) i++;
2080 if (UseG1GC) i++;
2081 if (i > 1) {
2082 jio_fprintf(defaultStream::error_stream(),
2083 "Conflicting collector combinations in option list; "
2084 "please refer to the release notes for the combinations "
2085 "allowed\n");
2086 return false;
2087 }
2088
2089 if (UseConcMarkSweepGC && !UseParNewGC) {
2090 jio_fprintf(defaultStream::error_stream(),
2091 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2092 return false;
2093 }
2094
2095 if (UseParNewGC && !UseConcMarkSweepGC) {
2096 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2097 // set up UseSerialGC properly, so that can't be used in the check here.
2098 jio_fprintf(defaultStream::error_stream(),
2099 "It is not possible to combine the ParNew young collector with the Serial old collector.\n");
2100 return false;
2101 }
2102
2103 return true;
2104 }
2105
2106 void Arguments::check_deprecated_gc_flags() {
2107 if (FLAG_IS_CMDLINE(UseParNewGC)) {
2108 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2109 }
2110 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2111 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2112 "and will likely be removed in future release");
2113 }
2114 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2115 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2116 "Use MaxRAMFraction instead.");
2117 }
2118 }
2119
2120 // Check stack pages settings
2121 bool Arguments::check_stack_pages()
2122 {
2123 bool status = true;
2124 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2125 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2126 // greater stack shadow pages can't generate instruction to bang stack
2127 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2128 return status;
2129 }
2130
2131 // Check the consistency of vm_init_args
2132 bool Arguments::check_vm_args_consistency() {
2133 // Method for adding checks for flag consistency.
2134 // The intent is to warn the user of all possible conflicts,
2135 // before returning an error.
2136 // Note: Needs platform-dependent factoring.
2137 bool status = true;
2138
2139 if (TLABRefillWasteFraction == 0) {
2140 jio_fprintf(defaultStream::error_stream(),
2141 "TLABRefillWasteFraction should be a denominator, "
2142 "not " SIZE_FORMAT "\n",
2143 TLABRefillWasteFraction);
2144 status = false;
2145 }
2146
2147 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2148 "AdaptiveSizePolicyWeight");
2149 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2150
2151 // Divide by bucket size to prevent a large size from causing rollover when
2152 // calculating amount of memory needed to be allocated for the String table.
2153 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2154 (max_uintx / StringTable::bucket_size()), "StringTable size");
2155
2156 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2157 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2158
2159 {
2160 // Using "else if" below to avoid printing two error messages if min > max.
2161 // This will also prevent us from reporting both min>100 and max>100 at the
2162 // same time, but that is less annoying than printing two identical errors IMHO.
2163 FormatBuffer<80> err_msg("%s","");
2164 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2165 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2166 status = false;
2167 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2168 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2169 status = false;
2170 }
2171 }
2172
2173 // Min/MaxMetaspaceFreeRatio
2174 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2175 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2176
2177 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2178 jio_fprintf(defaultStream::error_stream(),
2179 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2180 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2181 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2182 MinMetaspaceFreeRatio,
2183 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2184 MaxMetaspaceFreeRatio);
2185 status = false;
2186 }
2187
2188 // Trying to keep 100% free is not practical
2189 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2190
2191 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2192 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2193 }
2194
2195 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2196 // Settings to encourage splitting.
2197 if (!FLAG_IS_CMDLINE(NewRatio)) {
2198 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2199 }
2200 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2201 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2202 }
2203 }
2204
2205 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2206 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2207 }
2208
2209 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2210 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2211 if (GCTimeLimit == 100) {
2212 // Turn off gc-overhead-limit-exceeded checks
2213 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2214 }
2215
2216 status = status && check_gc_consistency_user();
2217 status = status && check_stack_pages();
2218
2219 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2220 "CMSIncrementalSafetyFactor");
2221
2222 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2223 // insists that we hold the requisite locks so that the iteration is
2224 // MT-safe. For the verification at start-up and shut-down, we don't
2225 // yet have a good way of acquiring and releasing these locks,
2226 // which are not visible at the CollectedHeap level. We want to
2227 // be able to acquire these locks and then do the iteration rather
2228 // than just disable the lock verification. This will be fixed under
2229 // bug 4788986.
2230 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2231 if (VerifyDuringStartup) {
2232 warning("Heap verification at start-up disabled "
2233 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2234 VerifyDuringStartup = false; // Disable verification at start-up
2235 }
2236
2237 if (VerifyBeforeExit) {
2238 warning("Heap verification at shutdown disabled "
2239 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2240 VerifyBeforeExit = false; // Disable verification at shutdown
2241 }
2242 }
2243
2244 // Note: only executed in non-PRODUCT mode
2245 if (!UseAsyncConcMarkSweepGC &&
2246 (ExplicitGCInvokesConcurrent ||
2247 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2248 jio_fprintf(defaultStream::error_stream(),
2249 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2250 " with -UseAsyncConcMarkSweepGC");
2251 status = false;
2252 }
2253
2254 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2255
2256 #if INCLUDE_ALL_GCS
2257 if (UseG1GC) {
2258 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2259 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2260 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2261
2262 status = status && verify_percentage(G1ConfidencePercent, "G1ConfidencePercent");
2263 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2264 "InitiatingHeapOccupancyPercent");
2265 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2266 "G1RefProcDrainInterval");
2267 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2268 "G1ConcMarkStepDurationMillis");
2269 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2270 "G1ConcRSHotCardLimit");
2271 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2272 "G1ConcRSLogCacheSize");
2273 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2274 "StringDeduplicationAgeThreshold");
2275 }
2276 if (UseConcMarkSweepGC) {
2277 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2278 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2279 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2280 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2281
2282 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2283
2284 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2285 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2286 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2287
2288 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2289
2290 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2291 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2292
2293 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2294 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2295 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2296
2297 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2298
2299 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2300
2301 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2302 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2303 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2304 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2305 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2306 }
2307
2308 if (UseParallelGC || UseParallelOldGC) {
2309 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2310 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2311
2312 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2313 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2314
2315 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2316 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2317
2318 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2319
2320 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2321 }
2322 #endif // INCLUDE_ALL_GCS
2323
2324 status = status && verify_interval(RefDiscoveryPolicy,
2325 ReferenceProcessor::DiscoveryPolicyMin,
2326 ReferenceProcessor::DiscoveryPolicyMax,
2327 "RefDiscoveryPolicy");
2328
2329 // Limit the lower bound of this flag to 1 as it is used in a division
2330 // expression.
2331 status = status && verify_interval(TLABWasteTargetPercent,
2332 1, 100, "TLABWasteTargetPercent");
2333
2334 status = status && verify_object_alignment();
2335
2336 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2337 "CompressedClassSpaceSize");
2338
2339 status = status && verify_interval(MarkStackSizeMax,
2340 1, (max_jint - 1), "MarkStackSizeMax");
2341 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2342
2343 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2344
2345 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2346
2347 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2348
2349 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2350 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2351
2352 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2353
2354 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2355 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2356 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2357 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2358
2359 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2360 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2361
2362 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2363 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2364 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2365
2366 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2367 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2368
2369 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2370 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2371 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2372 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2373
2374 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2375 #ifdef COMPILER1
2376 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2377 #endif
2378 status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps");
2379
2380 if (PrintNMTStatistics) {
2381 #if INCLUDE_NMT
2382 if (MemTracker::tracking_level() == NMT_off) {
2383 #endif // INCLUDE_NMT
2384 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2385 PrintNMTStatistics = false;
2386 #if INCLUDE_NMT
2387 }
2388 #endif
2389 }
2390
2391 // Need to limit the extent of the padding to reasonable size.
2392 // 8K is well beyond the reasonable HW cache line size, even with the
2393 // aggressive prefetching, while still leaving the room for segregating
2394 // among the distinct pages.
2395 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2396 jio_fprintf(defaultStream::error_stream(),
2397 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2398 ContendedPaddingWidth, 0, 8192);
2399 status = false;
2400 }
2401
2402 // Need to enforce the padding not to break the existing field alignments.
2403 // It is sufficient to check against the largest type size.
2404 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2405 jio_fprintf(defaultStream::error_stream(),
2406 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2407 ContendedPaddingWidth, BytesPerLong);
2408 status = false;
2409 }
2410
2411 // Check lower bounds of the code cache
2412 // Template Interpreter code is approximately 3X larger in debug builds.
2413 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2414 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2415 jio_fprintf(defaultStream::error_stream(),
2416 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2417 os::vm_page_size()/K);
2418 status = false;
2419 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2420 jio_fprintf(defaultStream::error_stream(),
2421 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2422 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2423 status = false;
2424 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2425 jio_fprintf(defaultStream::error_stream(),
2426 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2427 min_code_cache_size/K);
2428 status = false;
2429 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2430 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2431 jio_fprintf(defaultStream::error_stream(),
2432 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2433 CODE_CACHE_SIZE_LIMIT/M);
2434 status = false;
2435 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2436 jio_fprintf(defaultStream::error_stream(),
2437 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2438 min_code_cache_size/K);
2439 status = false;
2440 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2441 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2442 jio_fprintf(defaultStream::error_stream(),
2443 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2444 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2445 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2446 status = false;
2447 }
2448
2449 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2450 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2451 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2452 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2453
2454
2455 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2456 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2457 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2458 // Check the minimum number of compiler threads
2459 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2460
2461 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2462 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2463 }
2464
2465 return status;
2466 }
2467
2468 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2469 const char* option_type) {
2470 if (ignore) return false;
2471
2472 const char* spacer = " ";
2473 if (option_type == NULL) {
2474 option_type = ++spacer; // Set both to the empty string.
2475 }
2476
2477 if (os::obsolete_option(option)) {
2478 jio_fprintf(defaultStream::error_stream(),
2479 "Obsolete %s%soption: %s\n", option_type, spacer,
2480 option->optionString);
2481 return false;
2482 } else {
2483 jio_fprintf(defaultStream::error_stream(),
2484 "Unrecognized %s%soption: %s\n", option_type, spacer,
2485 option->optionString);
2486 return true;
2487 }
2488 }
2489
2490 static const char* user_assertion_options[] = {
2491 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2492 };
2493
2494 static const char* system_assertion_options[] = {
2495 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2496 };
2497
2498 bool Arguments::parse_uintx(const char* value,
2499 uintx* uintx_arg,
2500 uintx min_size) {
2501
2502 // Check the sign first since atomull() parses only unsigned values.
2503 bool value_is_positive = !(*value == '-');
2504
2505 if (value_is_positive) {
2506 julong n;
2507 bool good_return = atomull(value, &n);
2508 if (good_return) {
2509 bool above_minimum = n >= min_size;
2510 bool value_is_too_large = n > max_uintx;
2511
2512 if (above_minimum && !value_is_too_large) {
2513 *uintx_arg = n;
2514 return true;
2515 }
2516 }
2517 }
2518 return false;
2519 }
2520
2521 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2522 julong* long_arg,
2523 julong min_size) {
2524 if (!atomull(s, long_arg)) return arg_unreadable;
2525 return check_memory_size(*long_arg, min_size);
2526 }
2527
2528 // Parse JavaVMInitArgs structure
2529
2530 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2531 // For components of the system classpath.
2532 SysClassPath scp(Arguments::get_sysclasspath());
2533 bool scp_assembly_required = false;
2534
2535 // Save default settings for some mode flags
2536 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2537 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2538 Arguments::_ClipInlining = ClipInlining;
2539 Arguments::_BackgroundCompilation = BackgroundCompilation;
2540
2541 // Setup flags for mixed which is the default
2542 set_mode_flags(_mixed);
2543
2544 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2545 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2546 if (result != JNI_OK) {
2547 return result;
2548 }
2549
2550 // Parse JavaVMInitArgs structure passed in
2551 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2552 if (result != JNI_OK) {
2553 return result;
2554 }
2555
2556 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2557 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2558 if (result != JNI_OK) {
2559 return result;
2560 }
2561
2562 // Do final processing now that all arguments have been parsed
2563 result = finalize_vm_init_args(&scp, scp_assembly_required);
2564 if (result != JNI_OK) {
2565 return result;
2566 }
2567
2568 return JNI_OK;
2569 }
2570
2571 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2572 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2573 // are dealing with -agentpath (case where name is a path), otherwise with
2574 // -agentlib
2575 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2576 char *_name;
2577 const char *_hprof = "hprof", *_jdwp = "jdwp";
2578 size_t _len_hprof, _len_jdwp, _len_prefix;
2579
2580 if (is_path) {
2581 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2582 return false;
2583 }
2584
2585 _name++; // skip past last path separator
2586 _len_prefix = strlen(JNI_LIB_PREFIX);
2587
2588 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2589 return false;
2590 }
2591
2592 _name += _len_prefix;
2593 _len_hprof = strlen(_hprof);
2594 _len_jdwp = strlen(_jdwp);
2595
2596 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2597 _name += _len_hprof;
2598 }
2599 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2600 _name += _len_jdwp;
2601 }
2602 else {
2603 return false;
2604 }
2605
2606 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2607 return false;
2608 }
2609
2610 return true;
2611 }
2612
2613 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2614 return true;
2615 }
2616
2617 return false;
2618 }
2619
2620 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2621 SysClassPath* scp_p,
2622 bool* scp_assembly_required_p,
2623 Flag::Flags origin) {
2624 // Remaining part of option string
2625 const char* tail;
2626
2627 // iterate over arguments
2628 for (int index = 0; index < args->nOptions; index++) {
2629 bool is_absolute_path = false; // for -agentpath vs -agentlib
2630
2631 const JavaVMOption* option = args->options + index;
2632
2633 if (!match_option(option, "-Djava.class.path", &tail) &&
2634 !match_option(option, "-Dsun.java.command", &tail) &&
2635 !match_option(option, "-Dsun.java.launcher", &tail)) {
2636
2637 // add all jvm options to the jvm_args string. This string
2638 // is used later to set the java.vm.args PerfData string constant.
2639 // the -Djava.class.path and the -Dsun.java.command options are
2640 // omitted from jvm_args string as each have their own PerfData
2641 // string constant object.
2642 build_jvm_args(option->optionString);
2643 }
2644
2645 // -verbose:[class/gc/jni]
2646 if (match_option(option, "-verbose", &tail)) {
2647 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2648 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2649 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2650 } else if (!strcmp(tail, ":gc")) {
2651 FLAG_SET_CMDLINE(bool, PrintGC, true);
2652 } else if (!strcmp(tail, ":jni")) {
2653 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2654 }
2655 // -da / -ea / -disableassertions / -enableassertions
2656 // These accept an optional class/package name separated by a colon, e.g.,
2657 // -da:java.lang.Thread.
2658 } else if (match_option(option, user_assertion_options, &tail, true)) {
2659 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2660 if (*tail == '\0') {
2661 JavaAssertions::setUserClassDefault(enable);
2662 } else {
2663 assert(*tail == ':', "bogus match by match_option()");
2664 JavaAssertions::addOption(tail + 1, enable);
2665 }
2666 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2667 } else if (match_option(option, system_assertion_options, &tail, false)) {
2668 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2669 JavaAssertions::setSystemClassDefault(enable);
2670 // -bootclasspath:
2671 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2672 scp_p->reset_path(tail);
2673 *scp_assembly_required_p = true;
2674 // -bootclasspath/a:
2675 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2676 scp_p->add_suffix(tail);
2677 *scp_assembly_required_p = true;
2678 // -bootclasspath/p:
2679 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2680 scp_p->add_prefix(tail);
2681 *scp_assembly_required_p = true;
2682 // -Xrun
2683 } else if (match_option(option, "-Xrun", &tail)) {
2684 if (tail != NULL) {
2685 const char* pos = strchr(tail, ':');
2686 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2687 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2688 name[len] = '\0';
2689
2690 char *options = NULL;
2691 if(pos != NULL) {
2692 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2693 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2694 }
2695 #if !INCLUDE_JVMTI
2696 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2697 jio_fprintf(defaultStream::error_stream(),
2698 "Profiling and debugging agents are not supported in this VM\n");
2699 return JNI_ERR;
2700 }
2701 #endif // !INCLUDE_JVMTI
2702 add_init_library(name, options);
2703 }
2704 // -agentlib and -agentpath
2705 } else if (match_option(option, "-agentlib:", &tail) ||
2706 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2707 if(tail != NULL) {
2708 const char* pos = strchr(tail, '=');
2709 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2710 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2711 name[len] = '\0';
2712
2713 char *options = NULL;
2714 if(pos != NULL) {
2715 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2716 }
2717 #if !INCLUDE_JVMTI
2718 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2719 jio_fprintf(defaultStream::error_stream(),
2720 "Profiling and debugging agents are not supported in this VM\n");
2721 return JNI_ERR;
2722 }
2723 #endif // !INCLUDE_JVMTI
2724 add_init_agent(name, options, is_absolute_path);
2725 }
2726 // -javaagent
2727 } else if (match_option(option, "-javaagent:", &tail)) {
2728 #if !INCLUDE_JVMTI
2729 jio_fprintf(defaultStream::error_stream(),
2730 "Instrumentation agents are not supported in this VM\n");
2731 return JNI_ERR;
2732 #else
2733 if(tail != NULL) {
2734 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2735 add_init_agent("instrument", options, false);
2736 }
2737 #endif // !INCLUDE_JVMTI
2738 // -Xnoclassgc
2739 } else if (match_option(option, "-Xnoclassgc")) {
2740 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2741 // -Xconcgc
2742 } else if (match_option(option, "-Xconcgc")) {
2743 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2744 // -Xnoconcgc
2745 } else if (match_option(option, "-Xnoconcgc")) {
2746 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2747 // -Xbatch
2748 } else if (match_option(option, "-Xbatch")) {
2749 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2750 // -Xmn for compatibility with other JVM vendors
2751 } else if (match_option(option, "-Xmn", &tail)) {
2752 julong long_initial_young_size = 0;
2753 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2754 if (errcode != arg_in_range) {
2755 jio_fprintf(defaultStream::error_stream(),
2756 "Invalid initial young generation size: %s\n", option->optionString);
2757 describe_range_error(errcode);
2758 return JNI_EINVAL;
2759 }
2760 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size);
2761 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size);
2762 // -Xms
2763 } else if (match_option(option, "-Xms", &tail)) {
2764 julong long_initial_heap_size = 0;
2765 // an initial heap size of 0 means automatically determine
2766 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2767 if (errcode != arg_in_range) {
2768 jio_fprintf(defaultStream::error_stream(),
2769 "Invalid initial heap size: %s\n", option->optionString);
2770 describe_range_error(errcode);
2771 return JNI_EINVAL;
2772 }
2773 set_min_heap_size((uintx)long_initial_heap_size);
2774 // Currently the minimum size and the initial heap sizes are the same.
2775 // Can be overridden with -XX:InitialHeapSize.
2776 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2777 // -Xmx
2778 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2779 julong long_max_heap_size = 0;
2780 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2781 if (errcode != arg_in_range) {
2782 jio_fprintf(defaultStream::error_stream(),
2783 "Invalid maximum heap size: %s\n", option->optionString);
2784 describe_range_error(errcode);
2785 return JNI_EINVAL;
2786 }
2787 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2788 // Xmaxf
2789 } else if (match_option(option, "-Xmaxf", &tail)) {
2790 char* err;
2791 int maxf = (int)(strtod(tail, &err) * 100);
2792 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2793 jio_fprintf(defaultStream::error_stream(),
2794 "Bad max heap free percentage size: %s\n",
2795 option->optionString);
2796 return JNI_EINVAL;
2797 } else {
2798 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2799 }
2800 // Xminf
2801 } else if (match_option(option, "-Xminf", &tail)) {
2802 char* err;
2803 int minf = (int)(strtod(tail, &err) * 100);
2804 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2805 jio_fprintf(defaultStream::error_stream(),
2806 "Bad min heap free percentage size: %s\n",
2807 option->optionString);
2808 return JNI_EINVAL;
2809 } else {
2810 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2811 }
2812 // -Xss
2813 } else if (match_option(option, "-Xss", &tail)) {
2814 julong long_ThreadStackSize = 0;
2815 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2816 if (errcode != arg_in_range) {
2817 jio_fprintf(defaultStream::error_stream(),
2818 "Invalid thread stack size: %s\n", option->optionString);
2819 describe_range_error(errcode);
2820 return JNI_EINVAL;
2821 }
2822 // Internally track ThreadStackSize in units of 1024 bytes.
2823 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2824 round_to((int)long_ThreadStackSize, K) / K);
2825 // -Xoss
2826 } else if (match_option(option, "-Xoss", &tail)) {
2827 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2828 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2829 julong long_CodeCacheExpansionSize = 0;
2830 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2831 if (errcode != arg_in_range) {
2832 jio_fprintf(defaultStream::error_stream(),
2833 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2834 os::vm_page_size()/K);
2835 return JNI_EINVAL;
2836 }
2837 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2838 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2839 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2840 julong long_ReservedCodeCacheSize = 0;
2841
2842 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2843 if (errcode != arg_in_range) {
2844 jio_fprintf(defaultStream::error_stream(),
2845 "Invalid maximum code cache size: %s.\n", option->optionString);
2846 return JNI_EINVAL;
2847 }
2848 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2849 // -XX:NonNMethodCodeHeapSize=
2850 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2851 julong long_NonNMethodCodeHeapSize = 0;
2852
2853 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2854 if (errcode != arg_in_range) {
2855 jio_fprintf(defaultStream::error_stream(),
2856 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2857 return JNI_EINVAL;
2858 }
2859 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
2860 // -XX:ProfiledCodeHeapSize=
2861 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2862 julong long_ProfiledCodeHeapSize = 0;
2863
2864 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2865 if (errcode != arg_in_range) {
2866 jio_fprintf(defaultStream::error_stream(),
2867 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2868 return JNI_EINVAL;
2869 }
2870 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2871 // -XX:NonProfiledCodeHeapSizee=
2872 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2873 julong long_NonProfiledCodeHeapSize = 0;
2874
2875 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2876 if (errcode != arg_in_range) {
2877 jio_fprintf(defaultStream::error_stream(),
2878 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2879 return JNI_EINVAL;
2880 }
2881 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2882 //-XX:IncreaseFirstTierCompileThresholdAt=
2883 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2884 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2885 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2886 jio_fprintf(defaultStream::error_stream(),
2887 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2888 option->optionString);
2889 return JNI_EINVAL;
2890 }
2891 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2892 // -green
2893 } else if (match_option(option, "-green")) {
2894 jio_fprintf(defaultStream::error_stream(),
2895 "Green threads support not available\n");
2896 return JNI_EINVAL;
2897 // -native
2898 } else if (match_option(option, "-native")) {
2899 // HotSpot always uses native threads, ignore silently for compatibility
2900 // -Xsqnopause
2901 } else if (match_option(option, "-Xsqnopause")) {
2902 // EVM option, ignore silently for compatibility
2903 // -Xrs
2904 } else if (match_option(option, "-Xrs")) {
2905 // Classic/EVM option, new functionality
2906 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2907 } else if (match_option(option, "-Xusealtsigs")) {
2908 // change default internal VM signals used - lower case for back compat
2909 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2910 // -Xoptimize
2911 } else if (match_option(option, "-Xoptimize")) {
2912 // EVM option, ignore silently for compatibility
2913 // -Xprof
2914 } else if (match_option(option, "-Xprof")) {
2915 #if INCLUDE_FPROF
2916 _has_profile = true;
2917 #else // INCLUDE_FPROF
2918 jio_fprintf(defaultStream::error_stream(),
2919 "Flat profiling is not supported in this VM.\n");
2920 return JNI_ERR;
2921 #endif // INCLUDE_FPROF
2922 // -Xconcurrentio
2923 } else if (match_option(option, "-Xconcurrentio")) {
2924 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2925 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2926 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2927 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2928 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2929
2930 // -Xinternalversion
2931 } else if (match_option(option, "-Xinternalversion")) {
2932 jio_fprintf(defaultStream::output_stream(), "%s\n",
2933 VM_Version::internal_vm_info_string());
2934 vm_exit(0);
2935 #ifndef PRODUCT
2936 // -Xprintflags
2937 } else if (match_option(option, "-Xprintflags")) {
2938 CommandLineFlags::printFlags(tty, false);
2939 vm_exit(0);
2940 #endif
2941 // -D
2942 } else if (match_option(option, "-D", &tail)) {
2943 const char* value;
2944 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2945 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2946 // abort if -Djava.endorsed.dirs is set
2947 jio_fprintf(defaultStream::output_stream(),
2948 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2949 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2950 return JNI_EINVAL;
2951 }
2952 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2953 *value != '\0' && strcmp(value, "\"\"") != 0) {
2954 // abort if -Djava.ext.dirs is set
2955 jio_fprintf(defaultStream::output_stream(),
2956 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2957 return JNI_EINVAL;
2958 }
2959
2960 if (!add_property(tail)) {
2961 return JNI_ENOMEM;
2962 }
2963 // Out of the box management support
2964 if (match_option(option, "-Dcom.sun.management", &tail)) {
2965 #if INCLUDE_MANAGEMENT
2966 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2967 #else
2968 jio_fprintf(defaultStream::output_stream(),
2969 "-Dcom.sun.management is not supported in this VM.\n");
2970 return JNI_ERR;
2971 #endif
2972 }
2973 // -Xint
2974 } else if (match_option(option, "-Xint")) {
2975 set_mode_flags(_int);
2976 // -Xmixed
2977 } else if (match_option(option, "-Xmixed")) {
2978 set_mode_flags(_mixed);
2979 // -Xcomp
2980 } else if (match_option(option, "-Xcomp")) {
2981 // for testing the compiler; turn off all flags that inhibit compilation
2982 set_mode_flags(_comp);
2983 // -Xshare:dump
2984 } else if (match_option(option, "-Xshare:dump")) {
2985 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2986 set_mode_flags(_int); // Prevent compilation, which creates objects
2987 // -Xshare:on
2988 } else if (match_option(option, "-Xshare:on")) {
2989 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2990 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2991 // -Xshare:auto
2992 } else if (match_option(option, "-Xshare:auto")) {
2993 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2994 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2995 // -Xshare:off
2996 } else if (match_option(option, "-Xshare:off")) {
2997 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2998 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2999 // -Xverify
3000 } else if (match_option(option, "-Xverify", &tail)) {
3001 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3002 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3003 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3004 } else if (strcmp(tail, ":remote") == 0) {
3005 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3006 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3007 } else if (strcmp(tail, ":none") == 0) {
3008 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3009 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3010 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3011 return JNI_EINVAL;
3012 }
3013 // -Xdebug
3014 } else if (match_option(option, "-Xdebug")) {
3015 // note this flag has been used, then ignore
3016 set_xdebug_mode(true);
3017 // -Xnoagent
3018 } else if (match_option(option, "-Xnoagent")) {
3019 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3020 } else if (match_option(option, "-Xboundthreads")) {
3021 // Bind user level threads to kernel threads (Solaris only)
3022 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3023 } else if (match_option(option, "-Xloggc:", &tail)) {
3024 // Redirect GC output to the file. -Xloggc:<filename>
3025 // ostream_init_log(), when called will use this filename
3026 // to initialize a fileStream.
3027 _gc_log_filename = os::strdup_check_oom(tail);
3028 if (!is_filename_valid(_gc_log_filename)) {
3029 jio_fprintf(defaultStream::output_stream(),
3030 "Invalid file name for use with -Xloggc: Filename can only contain the "
3031 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3032 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3033 return JNI_EINVAL;
3034 }
3035 FLAG_SET_CMDLINE(bool, PrintGC, true);
3036 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3037
3038 // JNI hooks
3039 } else if (match_option(option, "-Xcheck", &tail)) {
3040 if (!strcmp(tail, ":jni")) {
3041 #if !INCLUDE_JNI_CHECK
3042 warning("JNI CHECKING is not supported in this VM");
3043 #else
3044 CheckJNICalls = true;
3045 #endif // INCLUDE_JNI_CHECK
3046 } else if (is_bad_option(option, args->ignoreUnrecognized,
3047 "check")) {
3048 return JNI_EINVAL;
3049 }
3050 } else if (match_option(option, "vfprintf")) {
3051 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3052 } else if (match_option(option, "exit")) {
3053 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3054 } else if (match_option(option, "abort")) {
3055 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3056 // -XX:+AggressiveHeap
3057 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3058
3059 // This option inspects the machine and attempts to set various
3060 // parameters to be optimal for long-running, memory allocation
3061 // intensive jobs. It is intended for machines with large
3062 // amounts of cpu and memory.
3063
3064 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3065 // VM, but we may not be able to represent the total physical memory
3066 // available (like having 8gb of memory on a box but using a 32bit VM).
3067 // Thus, we need to make sure we're using a julong for intermediate
3068 // calculations.
3069 julong initHeapSize;
3070 julong total_memory = os::physical_memory();
3071
3072 if (total_memory < (julong)256*M) {
3073 jio_fprintf(defaultStream::error_stream(),
3074 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3075 vm_exit(1);
3076 }
3077
3078 // The heap size is half of available memory, or (at most)
3079 // all of possible memory less 160mb (leaving room for the OS
3080 // when using ISM). This is the maximum; because adaptive sizing
3081 // is turned on below, the actual space used may be smaller.
3082
3083 initHeapSize = MIN2(total_memory / (julong)2,
3084 total_memory - (julong)160*M);
3085
3086 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3087
3088 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3089 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
3090 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
3091 // Currently the minimum size and the initial heap sizes are the same.
3092 set_min_heap_size(initHeapSize);
3093 }
3094 if (FLAG_IS_DEFAULT(NewSize)) {
3095 // Make the young generation 3/8ths of the total heap.
3096 FLAG_SET_CMDLINE(uintx, NewSize,
3097 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3098 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
3099 }
3100
3101 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3102 FLAG_SET_DEFAULT(UseLargePages, true);
3103 #endif
3104
3105 // Increase some data structure sizes for efficiency
3106 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
3107 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3108 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
3109
3110 // See the OldPLABSize comment below, but replace 'after promotion'
3111 // with 'after copying'. YoungPLABSize is the size of the survivor
3112 // space per-gc-thread buffers. The default is 4kw.
3113 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
3114
3115 // OldPLABSize is the size of the buffers in the old gen that
3116 // UseParallelGC uses to promote live data that doesn't fit in the
3117 // survivor spaces. At any given time, there's one for each gc thread.
3118 // The default size is 1kw. These buffers are rarely used, since the
3119 // survivor spaces are usually big enough. For specjbb, however, there
3120 // are occasions when there's lots of live data in the young gen
3121 // and we end up promoting some of it. We don't have a definite
3122 // explanation for why bumping OldPLABSize helps, but the theory
3123 // is that a bigger PLAB results in retaining something like the
3124 // original allocation order after promotion, which improves mutator
3125 // locality. A minor effect may be that larger PLABs reduce the
3126 // number of PLAB allocation events during gc. The value of 8kw
3127 // was arrived at by experimenting with specjbb.
3128 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
3129
3130 // Enable parallel GC and adaptive generation sizing
3131 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3132 FLAG_SET_DEFAULT(ParallelGCThreads,
3133 Abstract_VM_Version::parallel_worker_threads());
3134
3135 // Encourage steady state memory management
3136 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3137
3138 // This appears to improve mutator locality
3139 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3140
3141 // Get around early Solaris scheduling bug
3142 // (affinity vs other jobs on system)
3143 // but disallow DR and offlining (5008695).
3144 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3145
3146 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3147 // and the last option wins.
3148 } else if (match_option(option, "-XX:+NeverTenure")) {
3149 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3150 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3151 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3152 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3153 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3154 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3155 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3156 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3157 uintx max_tenuring_thresh = 0;
3158 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3159 jio_fprintf(defaultStream::error_stream(),
3160 "Invalid MaxTenuringThreshold: %s\n", option->optionString);
3161 }
3162 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3163
3164 if (MaxTenuringThreshold == 0) {
3165 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3166 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3167 } else {
3168 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3169 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3170 }
3171 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3172 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3173 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3174 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3175 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3176 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3177 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3178 #if defined(DTRACE_ENABLED)
3179 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3180 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3181 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3182 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3183 #else // defined(DTRACE_ENABLED)
3184 jio_fprintf(defaultStream::error_stream(),
3185 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3186 return JNI_EINVAL;
3187 #endif // defined(DTRACE_ENABLED)
3188 #ifdef ASSERT
3189 } else if (match_option(option, "-XX:+FullGCALot")) {
3190 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3191 // disable scavenge before parallel mark-compact
3192 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3193 #endif
3194 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3195 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3196 julong stack_size = 0;
3197 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3198 if (errcode != arg_in_range) {
3199 jio_fprintf(defaultStream::error_stream(),
3200 "Invalid mark stack size: %s\n", option->optionString);
3201 describe_range_error(errcode);
3202 return JNI_EINVAL;
3203 }
3204 jio_fprintf(defaultStream::error_stream(),
3205 "Please use -XX:MarkStackSize in place of "
3206 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n");
3207 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3208 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3209 julong max_stack_size = 0;
3210 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3211 if (errcode != arg_in_range) {
3212 jio_fprintf(defaultStream::error_stream(),
3213 "Invalid maximum mark stack size: %s\n",
3214 option->optionString);
3215 describe_range_error(errcode);
3216 return JNI_EINVAL;
3217 }
3218 jio_fprintf(defaultStream::error_stream(),
3219 "Please use -XX:MarkStackSizeMax in place of "
3220 "-XX:CMSMarkStackSizeMax in the future\n");
3221 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3222 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3223 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3224 uintx conc_threads = 0;
3225 if (!parse_uintx(tail, &conc_threads, 1)) {
3226 jio_fprintf(defaultStream::error_stream(),
3227 "Invalid concurrent threads: %s\n", option->optionString);
3228 return JNI_EINVAL;
3229 }
3230 jio_fprintf(defaultStream::error_stream(),
3231 "Please use -XX:ConcGCThreads in place of "
3232 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n");
3233 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3234 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3235 julong max_direct_memory_size = 0;
3236 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3237 if (errcode != arg_in_range) {
3238 jio_fprintf(defaultStream::error_stream(),
3239 "Invalid maximum direct memory size: %s\n",
3240 option->optionString);
3241 describe_range_error(errcode);
3242 return JNI_EINVAL;
3243 }
3244 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3245 #if !INCLUDE_MANAGEMENT
3246 } else if (match_option(option, "-XX:+ManagementServer")) {
3247 jio_fprintf(defaultStream::error_stream(),
3248 "ManagementServer is not supported in this VM.\n");
3249 return JNI_ERR;
3250 #endif // INCLUDE_MANAGEMENT
3251 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3252 // Skip -XX:Flags= since that case has already been handled
3253 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3254 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3255 return JNI_EINVAL;
3256 }
3257 }
3258 // Unknown option
3259 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3260 return JNI_ERR;
3261 }
3262 }
3263
3264 // PrintSharedArchiveAndExit will turn on
3265 // -Xshare:on
3266 // -XX:+TraceClassPaths
3267 if (PrintSharedArchiveAndExit) {
3268 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3269 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3270 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3271 }
3272
3273 // Change the default value for flags which have different default values
3274 // when working with older JDKs.
3275 #ifdef LINUX
3276 if (JDK_Version::current().compare_major(6) <= 0 &&
3277 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3278 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3279 }
3280 #endif // LINUX
3281 fix_appclasspath();
3282 return JNI_OK;
3283 }
3284
3285 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3286 //
3287 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3288 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3289 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3290 // path is treated as the current directory.
3291 //
3292 // This causes problems with CDS, which requires that all directories specified in the classpath
3293 // must be empty. In most cases, applications do NOT want to load classes from the current
3294 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3295 // scripts compatible with CDS.
3296 void Arguments::fix_appclasspath() {
3297 if (IgnoreEmptyClassPaths) {
3298 const char separator = *os::path_separator();
3299 const char* src = _java_class_path->value();
3300
3301 // skip over all the leading empty paths
3302 while (*src == separator) {
3303 src ++;
3304 }
3305
3306 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3307 strncpy(copy, src, strlen(src) + 1);
3308
3309 // trim all trailing empty paths
3310 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3311 *tail = '\0';
3312 }
3313
3314 char from[3] = {separator, separator, '\0'};
3315 char to [2] = {separator, '\0'};
3316 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3317 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3318 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3319 }
3320
3321 _java_class_path->set_value(copy);
3322 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3323 }
3324
3325 if (!PrintSharedArchiveAndExit) {
3326 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3327 }
3328 }
3329
3330 static bool has_jar_files(const char* directory) {
3331 DIR* dir = os::opendir(directory);
3332 if (dir == NULL) return false;
3333
3334 struct dirent *entry;
3335 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3336 bool hasJarFile = false;
3337 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3338 const char* name = entry->d_name;
3339 const char* ext = name + strlen(name) - 4;
3340 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3341 }
3342 FREE_C_HEAP_ARRAY(char, dbuf);
3343 os::closedir(dir);
3344 return hasJarFile ;
3345 }
3346
3347 static int check_non_empty_dirs(const char* path) {
3348 const char separator = *os::path_separator();
3349 const char* const end = path + strlen(path);
3350 int nonEmptyDirs = 0;
3351 while (path < end) {
3352 const char* tmp_end = strchr(path, separator);
3353 if (tmp_end == NULL) {
3354 if (has_jar_files(path)) {
3355 nonEmptyDirs++;
3356 jio_fprintf(defaultStream::output_stream(),
3357 "Non-empty directory: %s\n", path);
3358 }
3359 path = end;
3360 } else {
3361 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3362 memcpy(dirpath, path, tmp_end - path);
3363 dirpath[tmp_end - path] = '\0';
3364 if (has_jar_files(dirpath)) {
3365 nonEmptyDirs++;
3366 jio_fprintf(defaultStream::output_stream(),
3367 "Non-empty directory: %s\n", dirpath);
3368 }
3369 FREE_C_HEAP_ARRAY(char, dirpath);
3370 path = tmp_end + 1;
3371 }
3372 }
3373 return nonEmptyDirs;
3374 }
3375
3376 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3377 // check if the default lib/endorsed directory exists; if so, error
3378 char path[JVM_MAXPATHLEN];
3379 const char* fileSep = os::file_separator();
3380 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3381
3382 if (CheckEndorsedAndExtDirs) {
3383 int nonEmptyDirs = 0;
3384 // check endorsed directory
3385 nonEmptyDirs += check_non_empty_dirs(path);
3386 // check the extension directories
3387 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3388 if (nonEmptyDirs > 0) {
3389 return JNI_ERR;
3390 }
3391 }
3392
3393 DIR* dir = os::opendir(path);
3394 if (dir != NULL) {
3395 jio_fprintf(defaultStream::output_stream(),
3396 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3397 "in modular form will be supported via the concept of upgradeable modules.\n");
3398 os::closedir(dir);
3399 return JNI_ERR;
3400 }
3401
3402 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3403 dir = os::opendir(path);
3404 if (dir != NULL) {
3405 jio_fprintf(defaultStream::output_stream(),
3406 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3407 "Use -classpath instead.\n.");
3408 os::closedir(dir);
3409 return JNI_ERR;
3410 }
3411
3412 if (scp_assembly_required) {
3413 // Assemble the bootclasspath elements into the final path.
3414 Arguments::set_sysclasspath(scp_p->combined_path());
3415 }
3416
3417 // This must be done after all arguments have been processed.
3418 // java_compiler() true means set to "NONE" or empty.
3419 if (java_compiler() && !xdebug_mode()) {
3420 // For backwards compatibility, we switch to interpreted mode if
3421 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3422 // not specified.
3423 set_mode_flags(_int);
3424 }
3425
3426 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3427 // but like -Xint, leave compilation thresholds unaffected.
3428 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3429 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3430 set_mode_flags(_int);
3431 }
3432
3433 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3434 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3435 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3436 }
3437
3438 #ifndef COMPILER2
3439 // Don't degrade server performance for footprint
3440 if (FLAG_IS_DEFAULT(UseLargePages) &&
3441 MaxHeapSize < LargePageHeapSizeThreshold) {
3442 // No need for large granularity pages w/small heaps.
3443 // Note that large pages are enabled/disabled for both the
3444 // Java heap and the code cache.
3445 FLAG_SET_DEFAULT(UseLargePages, false);
3446 }
3447
3448 #else
3449 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3450 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3451 }
3452 #endif
3453
3454 #ifndef TIERED
3455 // Tiered compilation is undefined.
3456 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3457 #endif
3458
3459 // If we are running in a headless jre, force java.awt.headless property
3460 // to be true unless the property has already been set.
3461 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3462 if (os::is_headless_jre()) {
3463 const char* headless = Arguments::get_property("java.awt.headless");
3464 if (headless == NULL) {
3465 char envbuffer[128];
3466 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3467 if (!add_property("java.awt.headless=true")) {
3468 return JNI_ENOMEM;
3469 }
3470 } else {
3471 char buffer[256];
3472 strcpy(buffer, "java.awt.headless=");
3473 strcat(buffer, envbuffer);
3474 if (!add_property(buffer)) {
3475 return JNI_ENOMEM;
3476 }
3477 }
3478 }
3479 }
3480
3481 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3482 // CMS can only be used with ParNew
3483 FLAG_SET_ERGO(bool, UseParNewGC, true);
3484 }
3485
3486 if (!check_vm_args_consistency()) {
3487 return JNI_ERR;
3488 }
3489
3490 return JNI_OK;
3491 }
3492
3493 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3494 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3495 scp_assembly_required_p);
3496 }
3497
3498 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3499 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3500 scp_assembly_required_p);
3501 }
3502
3503 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3504 const int N_MAX_OPTIONS = 64;
3505 const int OPTION_BUFFER_SIZE = 1024;
3506 char buffer[OPTION_BUFFER_SIZE];
3507
3508 // The variable will be ignored if it exceeds the length of the buffer.
3509 // Don't check this variable if user has special privileges
3510 // (e.g. unix su command).
3511 if (os::getenv(name, buffer, sizeof(buffer)) &&
3512 !os::have_special_privileges()) {
3513 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3514 jio_fprintf(defaultStream::error_stream(),
3515 "Picked up %s: %s\n", name, buffer);
3516 char* rd = buffer; // pointer to the input string (rd)
3517 int i;
3518 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3519 while (isspace(*rd)) rd++; // skip whitespace
3520 if (*rd == 0) break; // we re done when the input string is read completely
3521
3522 // The output, option string, overwrites the input string.
3523 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3524 // input string (rd).
3525 char* wrt = rd;
3526
3527 options[i++].optionString = wrt; // Fill in option
3528 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3529 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3530 int quote = *rd; // matching quote to look for
3531 rd++; // don't copy open quote
3532 while (*rd != quote) { // include everything (even spaces) up until quote
3533 if (*rd == 0) { // string termination means unmatched string
3534 jio_fprintf(defaultStream::error_stream(),
3535 "Unmatched quote in %s\n", name);
3536 return JNI_ERR;
3537 }
3538 *wrt++ = *rd++; // copy to option string
3539 }
3540 rd++; // don't copy close quote
3541 } else {
3542 *wrt++ = *rd++; // copy to option string
3543 }
3544 }
3545 // Need to check if we're done before writing a NULL,
3546 // because the write could be to the byte that rd is pointing to.
3547 if (*rd++ == 0) {
3548 *wrt = 0;
3549 break;
3550 }
3551 *wrt = 0; // Zero terminate option
3552 }
3553 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3554 JavaVMInitArgs vm_args;
3555 vm_args.version = JNI_VERSION_1_2;
3556 vm_args.options = options;
3557 vm_args.nOptions = i;
3558 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3559
3560 if (PrintVMOptions) {
3561 const char* tail;
3562 for (int i = 0; i < vm_args.nOptions; i++) {
3563 const JavaVMOption *option = vm_args.options + i;
3564 if (match_option(option, "-XX:", &tail)) {
3565 logOption(tail);
3566 }
3567 }
3568 }
3569
3570 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR));
3571 }
3572 return JNI_OK;
3573 }
3574
3575 void Arguments::set_shared_spaces_flags() {
3576 if (DumpSharedSpaces) {
3577 if (RequireSharedSpaces) {
3578 warning("cannot dump shared archive while using shared archive");
3579 }
3580 UseSharedSpaces = false;
3581 #ifdef _LP64
3582 if (!UseCompressedOops || !UseCompressedClassPointers) {
3583 vm_exit_during_initialization(
3584 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3585 }
3586 } else {
3587 if (!UseCompressedOops || !UseCompressedClassPointers) {
3588 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3589 }
3590 #endif
3591 }
3592 }
3593
3594 #if !INCLUDE_ALL_GCS
3595 static void force_serial_gc() {
3596 FLAG_SET_DEFAULT(UseSerialGC, true);
3597 UNSUPPORTED_GC_OPTION(UseG1GC);
3598 UNSUPPORTED_GC_OPTION(UseParallelGC);
3599 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3600 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3601 UNSUPPORTED_GC_OPTION(UseParNewGC);
3602 }
3603 #endif // INCLUDE_ALL_GCS
3604
3605 // Sharing support
3606 // Construct the path to the archive
3607 static char* get_shared_archive_path() {
3608 char *shared_archive_path;
3609 if (SharedArchiveFile == NULL) {
3610 char jvm_path[JVM_MAXPATHLEN];
3611 os::jvm_path(jvm_path, sizeof(jvm_path));
3612 char *end = strrchr(jvm_path, *os::file_separator());
3613 if (end != NULL) *end = '\0';
3614 size_t jvm_path_len = strlen(jvm_path);
3615 size_t file_sep_len = strlen(os::file_separator());
3616 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3617 file_sep_len + 20, mtInternal);
3618 if (shared_archive_path != NULL) {
3619 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3620 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3621 strncat(shared_archive_path, "classes.jsa", 11);
3622 }
3623 } else {
3624 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3625 if (shared_archive_path != NULL) {
3626 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3627 }
3628 }
3629 return shared_archive_path;
3630 }
3631
3632 #ifndef PRODUCT
3633 // Determine whether LogVMOutput should be implicitly turned on.
3634 static bool use_vm_log() {
3635 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3636 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3637 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3638 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3639 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3640 return true;
3641 }
3642
3643 #ifdef COMPILER1
3644 if (PrintC1Statistics) {
3645 return true;
3646 }
3647 #endif // COMPILER1
3648
3649 #ifdef COMPILER2
3650 if (PrintOptoAssembly || PrintOptoStatistics) {
3651 return true;
3652 }
3653 #endif // COMPILER2
3654
3655 return false;
3656 }
3657 #endif // PRODUCT
3658
3659 // Parse entry point called from JNI_CreateJavaVM
3660
3661 jint Arguments::parse(const JavaVMInitArgs* args) {
3662
3663 // Remaining part of option string
3664 const char* tail;
3665
3666 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3667 const char* hotspotrc = ".hotspotrc";
3668 bool settings_file_specified = false;
3669 bool needs_hotspotrc_warning = false;
3670
3671 const char* flags_file;
3672 int index;
3673 for (index = 0; index < args->nOptions; index++) {
3674 const JavaVMOption *option = args->options + index;
3675 if (ArgumentsExt::process_options(option)) {
3676 continue;
3677 }
3678 if (match_option(option, "-XX:Flags=", &tail)) {
3679 flags_file = tail;
3680 settings_file_specified = true;
3681 continue;
3682 }
3683 if (match_option(option, "-XX:+PrintVMOptions")) {
3684 PrintVMOptions = true;
3685 continue;
3686 }
3687 if (match_option(option, "-XX:-PrintVMOptions")) {
3688 PrintVMOptions = false;
3689 continue;
3690 }
3691 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3692 IgnoreUnrecognizedVMOptions = true;
3693 continue;
3694 }
3695 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3696 IgnoreUnrecognizedVMOptions = false;
3697 continue;
3698 }
3699 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3700 CommandLineFlags::printFlags(tty, false);
3701 vm_exit(0);
3702 }
3703 #if INCLUDE_NMT
3704 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3705 // The launcher did not setup nmt environment variable properly.
3706 if (!MemTracker::check_launcher_nmt_support(tail)) {
3707 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3708 }
3709
3710 // Verify if nmt option is valid.
3711 if (MemTracker::verify_nmt_option()) {
3712 // Late initialization, still in single-threaded mode.
3713 if (MemTracker::tracking_level() >= NMT_summary) {
3714 MemTracker::init();
3715 }
3716 } else {
3717 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3718 }
3719 continue;
3720 }
3721 #endif
3722
3723
3724 #ifndef PRODUCT
3725 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3726 CommandLineFlags::printFlags(tty, true);
3727 vm_exit(0);
3728 }
3729 #endif
3730 }
3731
3732 if (IgnoreUnrecognizedVMOptions) {
3733 // uncast const to modify the flag args->ignoreUnrecognized
3734 *(jboolean*)(&args->ignoreUnrecognized) = true;
3735 }
3736
3737 // Parse specified settings file
3738 if (settings_file_specified) {
3739 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3740 return JNI_EINVAL;
3741 }
3742 } else {
3743 #ifdef ASSERT
3744 // Parse default .hotspotrc settings file
3745 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3746 return JNI_EINVAL;
3747 }
3748 #else
3749 struct stat buf;
3750 if (os::stat(hotspotrc, &buf) == 0) {
3751 needs_hotspotrc_warning = true;
3752 }
3753 #endif
3754 }
3755
3756 if (PrintVMOptions) {
3757 for (index = 0; index < args->nOptions; index++) {
3758 const JavaVMOption *option = args->options + index;
3759 if (match_option(option, "-XX:", &tail)) {
3760 logOption(tail);
3761 }
3762 }
3763 }
3764
3765 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3766 jint result = parse_vm_init_args(args);
3767 if (result != JNI_OK) {
3768 return result;
3769 }
3770
3771 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3772 SharedArchivePath = get_shared_archive_path();
3773 if (SharedArchivePath == NULL) {
3774 return JNI_ENOMEM;
3775 }
3776
3777 // Set up VerifySharedSpaces
3778 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3779 VerifySharedSpaces = true;
3780 }
3781
3782 // Delay warning until here so that we've had a chance to process
3783 // the -XX:-PrintWarnings flag
3784 if (needs_hotspotrc_warning) {
3785 warning("%s file is present but has been ignored. "
3786 "Run with -XX:Flags=%s to load the file.",
3787 hotspotrc, hotspotrc);
3788 }
3789
3790 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3791 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3792 #endif
3793
3794 ArgumentsExt::report_unsupported_options();
3795
3796 #ifndef PRODUCT
3797 if (TraceBytecodesAt != 0) {
3798 TraceBytecodes = true;
3799 }
3800 if (CountCompiledCalls) {
3801 if (UseCounterDecay) {
3802 warning("UseCounterDecay disabled because CountCalls is set");
3803 UseCounterDecay = false;
3804 }
3805 }
3806 #endif // PRODUCT
3807
3808 if (ScavengeRootsInCode == 0) {
3809 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3810 warning("forcing ScavengeRootsInCode non-zero");
3811 }
3812 ScavengeRootsInCode = 1;
3813 }
3814
3815 if (PrintGCDetails) {
3816 // Turn on -verbose:gc options as well
3817 PrintGC = true;
3818 }
3819
3820 // Set object alignment values.
3821 set_object_alignment();
3822
3823 #if !INCLUDE_ALL_GCS
3824 force_serial_gc();
3825 #endif // INCLUDE_ALL_GCS
3826 #if !INCLUDE_CDS
3827 if (DumpSharedSpaces || RequireSharedSpaces) {
3828 jio_fprintf(defaultStream::error_stream(),
3829 "Shared spaces are not supported in this VM\n");
3830 return JNI_ERR;
3831 }
3832 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3833 warning("Shared spaces are not supported in this VM");
3834 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3835 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3836 }
3837 no_shared_spaces("CDS Disabled");
3838 #endif // INCLUDE_CDS
3839
3840 return JNI_OK;
3841 }
3842
3843 jint Arguments::apply_ergo() {
3844
3845 // Set flags based on ergonomics.
3846 set_ergonomics_flags();
3847
3848 set_shared_spaces_flags();
3849
3850 // Check the GC selections again.
3851 if (!ArgumentsExt::check_gc_consistency_ergo()) {
3852 return JNI_EINVAL;
3853 }
3854
3855 if (TieredCompilation) {
3856 set_tiered_flags();
3857 } else {
3858 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3859 if (CompilationPolicyChoice >= 2) {
3860 vm_exit_during_initialization(
3861 "Incompatible compilation policy selected", NULL);
3862 }
3863 // Scale CompileThreshold
3864 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
3865 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
3866 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
3867 }
3868 }
3869
3870 #ifdef COMPILER2
3871 #ifndef PRODUCT
3872 if (PrintIdealGraphLevel > 0) {
3873 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3874 }
3875 #endif
3876 #endif
3877
3878 // Set heap size based on available physical memory
3879 set_heap_size();
3880
3881 ArgumentsExt::set_gc_specific_flags();
3882
3883 // Initialize Metaspace flags and alignments
3884 Metaspace::ergo_initialize();
3885
3886 // Set bytecode rewriting flags
3887 set_bytecode_flags();
3888
3889 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3890 set_aggressive_opts_flags();
3891
3892 // Turn off biased locking for locking debug mode flags,
3893 // which are subtly different from each other but neither works with
3894 // biased locking
3895 if (UseHeavyMonitors
3896 #ifdef COMPILER1
3897 || !UseFastLocking
3898 #endif // COMPILER1
3899 ) {
3900 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3901 // flag set to true on command line; warn the user that they
3902 // can't enable biased locking here
3903 warning("Biased Locking is not supported with locking debug flags"
3904 "; ignoring UseBiasedLocking flag." );
3905 }
3906 UseBiasedLocking = false;
3907 }
3908
3909 #ifdef ZERO
3910 // Clear flags not supported on zero.
3911 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3912 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3913 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3914 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3915 #endif // CC_INTERP
3916
3917 #ifdef COMPILER2
3918 if (!EliminateLocks) {
3919 EliminateNestedLocks = false;
3920 }
3921 if (!Inline) {
3922 IncrementalInline = false;
3923 }
3924 #ifndef PRODUCT
3925 if (!IncrementalInline) {
3926 AlwaysIncrementalInline = false;
3927 }
3928 #endif
3929 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3930 // nothing to use the profiling, turn if off
3931 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3932 }
3933 #endif
3934
3935 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3936 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3937 DebugNonSafepoints = true;
3938 }
3939
3940 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3941 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3942 }
3943
3944 #ifndef PRODUCT
3945 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3946 if (use_vm_log()) {
3947 LogVMOutput = true;
3948 }
3949 }
3950 #endif // PRODUCT
3951
3952 if (PrintCommandLineFlags) {
3953 CommandLineFlags::printSetFlags(tty);
3954 }
3955
3956 // Apply CPU specific policy for the BiasedLocking
3957 if (UseBiasedLocking) {
3958 if (!VM_Version::use_biased_locking() &&
3959 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3960 UseBiasedLocking = false;
3961 }
3962 }
3963 #ifdef COMPILER2
3964 if (!UseBiasedLocking || EmitSync != 0) {
3965 UseOptoBiasInlining = false;
3966 }
3967 #endif
3968
3969 return JNI_OK;
3970 }
3971
3972 jint Arguments::adjust_after_os() {
3973 if (UseNUMA) {
3974 if (UseParallelGC || UseParallelOldGC) {
3975 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3976 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3977 }
3978 }
3979 // UseNUMAInterleaving is set to ON for all collectors and
3980 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3981 // such as the parallel collector for Linux and Solaris will
3982 // interleave old gen and survivor spaces on top of NUMA
3983 // allocation policy for the eden space.
3984 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3985 // all platforms and ParallelGC on Windows will interleave all
3986 // of the heap spaces across NUMA nodes.
3987 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3988 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3989 }
3990 }
3991 return JNI_OK;
3992 }
3993
3994 int Arguments::PropertyList_count(SystemProperty* pl) {
3995 int count = 0;
3996 while(pl != NULL) {
3997 count++;
3998 pl = pl->next();
3999 }
4000 return count;
4001 }
4002
4003 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4004 assert(key != NULL, "just checking");
4005 SystemProperty* prop;
4006 for (prop = pl; prop != NULL; prop = prop->next()) {
4007 if (strcmp(key, prop->key()) == 0) return prop->value();
4008 }
4009 return NULL;
4010 }
4011
4012 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4013 int count = 0;
4014 const char* ret_val = NULL;
4015
4016 while(pl != NULL) {
4017 if(count >= index) {
4018 ret_val = pl->key();
4019 break;
4020 }
4021 count++;
4022 pl = pl->next();
4023 }
4024
4025 return ret_val;
4026 }
4027
4028 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4029 int count = 0;
4030 char* ret_val = NULL;
4031
4032 while(pl != NULL) {
4033 if(count >= index) {
4034 ret_val = pl->value();
4035 break;
4036 }
4037 count++;
4038 pl = pl->next();
4039 }
4040
4041 return ret_val;
4042 }
4043
4044 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4045 SystemProperty* p = *plist;
4046 if (p == NULL) {
4047 *plist = new_p;
4048 } else {
4049 while (p->next() != NULL) {
4050 p = p->next();
4051 }
4052 p->set_next(new_p);
4053 }
4054 }
4055
4056 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4057 if (plist == NULL)
4058 return;
4059
4060 SystemProperty* new_p = new SystemProperty(k, v, true);
4061 PropertyList_add(plist, new_p);
4062 }
4063
4064 void Arguments::PropertyList_add(SystemProperty *element) {
4065 PropertyList_add(&_system_properties, element);
4066 }
4067
4068 // This add maintains unique property key in the list.
4069 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4070 if (plist == NULL)
4071 return;
4072
4073 // If property key exist then update with new value.
4074 SystemProperty* prop;
4075 for (prop = *plist; prop != NULL; prop = prop->next()) {
4076 if (strcmp(k, prop->key()) == 0) {
4077 if (append) {
4078 prop->append_value(v);
4079 } else {
4080 prop->set_value(v);
4081 }
4082 return;
4083 }
4084 }
4085
4086 PropertyList_add(plist, k, v);
4087 }
4088
4089 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4090 // Returns true if all of the source pointed by src has been copied over to
4091 // the destination buffer pointed by buf. Otherwise, returns false.
4092 // Notes:
4093 // 1. If the length (buflen) of the destination buffer excluding the
4094 // NULL terminator character is not long enough for holding the expanded
4095 // pid characters, it also returns false instead of returning the partially
4096 // expanded one.
4097 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4098 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4099 char* buf, size_t buflen) {
4100 const char* p = src;
4101 char* b = buf;
4102 const char* src_end = &src[srclen];
4103 char* buf_end = &buf[buflen - 1];
4104
4105 while (p < src_end && b < buf_end) {
4106 if (*p == '%') {
4107 switch (*(++p)) {
4108 case '%': // "%%" ==> "%"
4109 *b++ = *p++;
4110 break;
4111 case 'p': { // "%p" ==> current process id
4112 // buf_end points to the character before the last character so
4113 // that we could write '\0' to the end of the buffer.
4114 size_t buf_sz = buf_end - b + 1;
4115 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4116
4117 // if jio_snprintf fails or the buffer is not long enough to hold
4118 // the expanded pid, returns false.
4119 if (ret < 0 || ret >= (int)buf_sz) {
4120 return false;
4121 } else {
4122 b += ret;
4123 assert(*b == '\0', "fail in copy_expand_pid");
4124 if (p == src_end && b == buf_end + 1) {
4125 // reach the end of the buffer.
4126 return true;
4127 }
4128 }
4129 p++;
4130 break;
4131 }
4132 default :
4133 *b++ = '%';
4134 }
4135 } else {
4136 *b++ = *p++;
4137 }
4138 }
4139 *b = '\0';
4140 return (p == src_end); // return false if not all of the source was copied
4141 }