1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "compiler/compilerOracle.hpp"
31 #include "memory/allocation.inline.hpp"
32 #include "memory/cardTableRS.hpp"
33 #include "memory/genCollectedHeap.hpp"
34 #include "memory/referenceProcessor.hpp"
35 #include "memory/universe.inline.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "prims/jvmtiExport.hpp"
38 #include "runtime/arguments.hpp"
39 #include "runtime/arguments_ext.hpp"
40 #include "runtime/globals_extension.hpp"
41 #include "runtime/java.hpp"
42 #include "runtime/os.hpp"
43 #include "runtime/vm_version.hpp"
44 #include "services/management.hpp"
45 #include "services/memTracker.hpp"
46 #include "utilities/defaultStream.hpp"
47 #include "utilities/macros.hpp"
48 #include "utilities/stringUtils.hpp"
49 #include "utilities/taskqueue.hpp"
50 #if INCLUDE_ALL_GCS
51 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
52 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
53 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
54 #endif // INCLUDE_ALL_GCS
55
56 // Note: This is a special bug reporting site for the JVM
57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
58 #define DEFAULT_JAVA_LAUNCHER "generic"
59
60 #define UNSUPPORTED_GC_OPTION(gc) \
61 do { \
62 if (gc) { \
63 if (FLAG_IS_CMDLINE(gc)) { \
64 warning(#gc " is not supported in this VM. Using Serial GC."); \
65 } \
66 FLAG_SET_DEFAULT(gc, false); \
67 } \
68 } while(0)
69
70 char** Arguments::_jvm_flags_array = NULL;
71 int Arguments::_num_jvm_flags = 0;
72 char** Arguments::_jvm_args_array = NULL;
73 int Arguments::_num_jvm_args = 0;
74 char* Arguments::_java_command = NULL;
75 SystemProperty* Arguments::_system_properties = NULL;
76 const char* Arguments::_gc_log_filename = NULL;
77 bool Arguments::_has_profile = false;
78 size_t Arguments::_conservative_max_heap_alignment = 0;
79 size_t Arguments::_min_heap_size = 0;
80 uintx Arguments::_min_heap_free_ratio = 0;
81 uintx Arguments::_max_heap_free_ratio = 0;
82 Arguments::Mode Arguments::_mode = _mixed;
83 bool Arguments::_java_compiler = false;
84 bool Arguments::_xdebug_mode = false;
85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
87 int Arguments::_sun_java_launcher_pid = -1;
88 bool Arguments::_sun_java_launcher_is_altjvm = false;
89
90 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
93 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
94 bool Arguments::_ClipInlining = ClipInlining;
95
96 char* Arguments::SharedArchivePath = NULL;
97
98 AgentLibraryList Arguments::_libraryList;
99 AgentLibraryList Arguments::_agentList;
100
101 abort_hook_t Arguments::_abort_hook = NULL;
102 exit_hook_t Arguments::_exit_hook = NULL;
103 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
104
105
106 SystemProperty *Arguments::_sun_boot_library_path = NULL;
107 SystemProperty *Arguments::_java_library_path = NULL;
108 SystemProperty *Arguments::_java_home = NULL;
109 SystemProperty *Arguments::_java_class_path = NULL;
110 SystemProperty *Arguments::_sun_boot_class_path = NULL;
111
112 char* Arguments::_ext_dirs = NULL;
113
114 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
115 // part of the option string.
116 static bool match_option(const JavaVMOption *option, const char* name,
117 const char** tail) {
118 int len = (int)strlen(name);
119 if (strncmp(option->optionString, name, len) == 0) {
120 *tail = option->optionString + len;
121 return true;
122 } else {
123 return false;
124 }
125 }
126
127 // Check if 'option' matches 'name'. No "tail" is allowed.
128 static bool match_option(const JavaVMOption *option, const char* name) {
129 const char* tail = NULL;
130 bool result = match_option(option, name, &tail);
131 if (tail != NULL && *tail == '\0') {
132 return result;
133 } else {
134 return false;
135 }
136 }
137
138 // Return true if any of the strings in null-terminated array 'names' matches.
139 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
140 // the option must match exactly.
141 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
142 bool tail_allowed) {
143 for (/* empty */; *names != NULL; ++names) {
144 if (match_option(option, *names, tail)) {
145 if (**tail == '\0' || tail_allowed && **tail == ':') {
146 return true;
147 }
148 }
149 }
150 return false;
151 }
152
153 static void logOption(const char* opt) {
154 if (PrintVMOptions) {
155 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
156 }
157 }
158
159 // Process java launcher properties.
160 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
161 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
162 // sun.java.launcher.pid is defined.
163 // Must do this before setting up other system properties,
164 // as some of them may depend on launcher type.
165 for (int index = 0; index < args->nOptions; index++) {
166 const JavaVMOption* option = args->options + index;
167 const char* tail;
168
169 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
170 process_java_launcher_argument(tail, option->extraInfo);
171 continue;
172 }
173 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
174 if (strcmp(tail, "true") == 0) {
175 _sun_java_launcher_is_altjvm = true;
176 }
177 continue;
178 }
179 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
180 _sun_java_launcher_pid = atoi(tail);
181 continue;
182 }
183 }
184 }
185
186 // Initialize system properties key and value.
187 void Arguments::init_system_properties() {
188
189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
190 "Java Virtual Machine Specification", false));
191 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
192 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
193 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
194
195 // Following are JVMTI agent writable properties.
196 // Properties values are set to NULL and they are
197 // os specific they are initialized in os::init_system_properties_values().
198 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
199 _java_library_path = new SystemProperty("java.library.path", NULL, true);
200 _java_home = new SystemProperty("java.home", NULL, true);
201 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
202
203 _java_class_path = new SystemProperty("java.class.path", "", true);
204
205 // Add to System Property list.
206 PropertyList_add(&_system_properties, _sun_boot_library_path);
207 PropertyList_add(&_system_properties, _java_library_path);
208 PropertyList_add(&_system_properties, _java_home);
209 PropertyList_add(&_system_properties, _java_class_path);
210 PropertyList_add(&_system_properties, _sun_boot_class_path);
211
212 // Set OS specific system properties values
213 os::init_system_properties_values();
214 }
215
216
217 // Update/Initialize System properties after JDK version number is known
218 void Arguments::init_version_specific_system_properties() {
219 enum { bufsz = 16 };
220 char buffer[bufsz];
221 const char* spec_vendor = "Sun Microsystems Inc.";
222 uint32_t spec_version = 0;
223
224 spec_vendor = "Oracle Corporation";
225 spec_version = JDK_Version::current().major_version();
226 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
227
228 PropertyList_add(&_system_properties,
229 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
230 PropertyList_add(&_system_properties,
231 new SystemProperty("java.vm.specification.version", buffer, false));
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
234 }
235
236 /**
237 * Provide a slightly more user-friendly way of eliminating -XX flags.
238 * When a flag is eliminated, it can be added to this list in order to
239 * continue accepting this flag on the command-line, while issuing a warning
240 * and ignoring the value. Once the JDK version reaches the 'accept_until'
241 * limit, we flatly refuse to admit the existence of the flag. This allows
242 * a flag to die correctly over JDK releases using HSX.
243 * But now that HSX is no longer supported only options with a future
244 * accept_until value need to be listed, and the list can be pruned
245 * on each major release.
246 */
247 typedef struct {
248 const char* name;
249 JDK_Version obsoleted_in; // when the flag went away
250 JDK_Version accept_until; // which version to start denying the existence
251 } ObsoleteFlag;
252
253 static ObsoleteFlag obsolete_jvm_flags[] = {
254 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
255 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
256 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
257 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
258 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
259 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
260 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
261 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
262 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
263 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
264 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
265 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
266 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
267 #ifndef ZERO
268 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
269 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
270 #endif // ZERO
271 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) },
272 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) },
273 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) },
274 { 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(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1295 } else {
1296 FLAG_SET_ERGO(size_t, 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(size_t, NewSize, MAX2(NewSize, min_new));
1320 FLAG_SET_ERGO(size_t, 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(size_t, 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(size_t, 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 } else {
1559 FLAG_SET_ERGO(bool, UseSerialGC, true);
1560 }
1561 }
1562
1563 void Arguments::select_gc() {
1564 if (!gc_selected()) {
1565 select_gc_ergonomically();
1566 guarantee(gc_selected(), "No GC selected");
1567 }
1568 }
1569
1570 void Arguments::set_ergonomics_flags() {
1571 select_gc();
1572
1573 #ifdef COMPILER2
1574 // Shared spaces work fine with other GCs but causes bytecode rewriting
1575 // to be disabled, which hurts interpreter performance and decreases
1576 // server performance. When -server is specified, keep the default off
1577 // unless it is asked for. Future work: either add bytecode rewriting
1578 // at link time, or rewrite bytecodes in non-shared methods.
1579 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1580 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1581 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1582 }
1583 #endif
1584
1585 set_conservative_max_heap_alignment();
1586
1587 #ifndef ZERO
1588 #ifdef _LP64
1589 set_use_compressed_oops();
1590
1591 // set_use_compressed_klass_ptrs() must be called after calling
1592 // set_use_compressed_oops().
1593 set_use_compressed_klass_ptrs();
1594
1595 // Also checks that certain machines are slower with compressed oops
1596 // in vm_version initialization code.
1597 #endif // _LP64
1598 #endif // !ZERO
1599 }
1600
1601 void Arguments::set_parallel_gc_flags() {
1602 assert(UseParallelGC || UseParallelOldGC, "Error");
1603 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1604 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1605 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1606 }
1607 FLAG_SET_DEFAULT(UseParallelGC, true);
1608
1609 // If no heap maximum was requested explicitly, use some reasonable fraction
1610 // of the physical memory, up to a maximum of 1GB.
1611 FLAG_SET_DEFAULT(ParallelGCThreads,
1612 Abstract_VM_Version::parallel_worker_threads());
1613 if (ParallelGCThreads == 0) {
1614 jio_fprintf(defaultStream::error_stream(),
1615 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1616 vm_exit(1);
1617 }
1618
1619 if (UseAdaptiveSizePolicy) {
1620 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1621 // unless the user actually sets these flags.
1622 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1623 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1624 _min_heap_free_ratio = MinHeapFreeRatio;
1625 }
1626 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1627 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1628 _max_heap_free_ratio = MaxHeapFreeRatio;
1629 }
1630 }
1631
1632 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1633 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1634 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1635 // See CR 6362902 for details.
1636 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1637 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1638 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1639 }
1640 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1641 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1642 }
1643 }
1644
1645 if (UseParallelOldGC) {
1646 // Par compact uses lower default values since they are treated as
1647 // minimums. These are different defaults because of the different
1648 // interpretation and are not ergonomically set.
1649 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1650 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1651 }
1652 }
1653 }
1654
1655 void Arguments::set_g1_gc_flags() {
1656 assert(UseG1GC, "Error");
1657 #ifdef COMPILER1
1658 FastTLABRefill = false;
1659 #endif
1660 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1661 if (ParallelGCThreads == 0) {
1662 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1663 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1664 }
1665
1666 #if INCLUDE_ALL_GCS
1667 if (G1ConcRefinementThreads == 0) {
1668 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1669 }
1670 #endif
1671
1672 // MarkStackSize will be set (if it hasn't been set by the user)
1673 // when concurrent marking is initialized.
1674 // Its value will be based upon the number of parallel marking threads.
1675 // But we do set the maximum mark stack size here.
1676 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1677 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1678 }
1679
1680 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1681 // In G1, we want the default GC overhead goal to be higher than
1682 // say in PS. So we set it here to 10%. Otherwise the heap might
1683 // be expanded more aggressively than we would like it to. In
1684 // fact, even 10% seems to not be high enough in some cases
1685 // (especially small GC stress tests that the main thing they do
1686 // is allocation). We might consider increase it further.
1687 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1688 }
1689
1690 if (PrintGCDetails && Verbose) {
1691 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1692 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1693 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads);
1694 }
1695 }
1696
1697 #if !INCLUDE_ALL_GCS
1698 #ifdef ASSERT
1699 static bool verify_serial_gc_flags() {
1700 return (UseSerialGC &&
1701 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1702 UseParallelGC || UseParallelOldGC));
1703 }
1704 #endif // ASSERT
1705 #endif // INCLUDE_ALL_GCS
1706
1707 void Arguments::set_gc_specific_flags() {
1708 #if INCLUDE_ALL_GCS
1709 // Set per-collector flags
1710 if (UseParallelGC || UseParallelOldGC) {
1711 set_parallel_gc_flags();
1712 } else if (UseConcMarkSweepGC) {
1713 set_cms_and_parnew_gc_flags();
1714 } else if (UseG1GC) {
1715 set_g1_gc_flags();
1716 }
1717 check_deprecated_gc_flags();
1718 if (AssumeMP && !UseSerialGC) {
1719 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1720 warning("If the number of processors is expected to increase from one, then"
1721 " you should configure the number of parallel GC threads appropriately"
1722 " using -XX:ParallelGCThreads=N");
1723 }
1724 }
1725 if (MinHeapFreeRatio == 100) {
1726 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1727 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1728 }
1729 #else // INCLUDE_ALL_GCS
1730 assert(verify_serial_gc_flags(), "SerialGC unset");
1731 #endif // INCLUDE_ALL_GCS
1732 }
1733
1734 julong Arguments::limit_by_allocatable_memory(julong limit) {
1735 julong max_allocatable;
1736 julong result = limit;
1737 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1738 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1739 }
1740 return result;
1741 }
1742
1743 // Use static initialization to get the default before parsing
1744 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1745
1746 void Arguments::set_heap_size() {
1747 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1748 // Deprecated flag
1749 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1750 }
1751
1752 const julong phys_mem =
1753 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1754 : (julong)MaxRAM;
1755
1756 // If the maximum heap size has not been set with -Xmx,
1757 // then set it as fraction of the size of physical memory,
1758 // respecting the maximum and minimum sizes of the heap.
1759 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1760 julong reasonable_max = phys_mem / MaxRAMFraction;
1761
1762 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1763 // Small physical memory, so use a minimum fraction of it for the heap
1764 reasonable_max = phys_mem / MinRAMFraction;
1765 } else {
1766 // Not-small physical memory, so require a heap at least
1767 // as large as MaxHeapSize
1768 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1769 }
1770 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1771 // Limit the heap size to ErgoHeapSizeLimit
1772 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1773 }
1774 if (UseCompressedOops) {
1775 // Limit the heap size to the maximum possible when using compressed oops
1776 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1777
1778 // HeapBaseMinAddress can be greater than default but not less than.
1779 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1780 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1781 // matches compressed oops printing flags
1782 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1783 jio_fprintf(defaultStream::error_stream(),
1784 "HeapBaseMinAddress must be at least " SIZE_FORMAT
1785 " (" SIZE_FORMAT "G) which is greater than value given "
1786 SIZE_FORMAT "\n",
1787 DefaultHeapBaseMinAddress,
1788 DefaultHeapBaseMinAddress/G,
1789 HeapBaseMinAddress);
1790 }
1791 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1792 }
1793 }
1794
1795 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1796 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1797 // but it should be not less than default MaxHeapSize.
1798 max_coop_heap -= HeapBaseMinAddress;
1799 }
1800 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1801 }
1802 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1803
1804 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1805 // An initial heap size was specified on the command line,
1806 // so be sure that the maximum size is consistent. Done
1807 // after call to limit_by_allocatable_memory because that
1808 // method might reduce the allocation size.
1809 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1810 }
1811
1812 if (PrintGCDetails && Verbose) {
1813 // Cannot use gclog_or_tty yet.
1814 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1815 }
1816 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1817 }
1818
1819 // If the minimum or initial heap_size have not been set or requested to be set
1820 // ergonomically, set them accordingly.
1821 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1822 julong reasonable_minimum = (julong)(OldSize + NewSize);
1823
1824 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1825
1826 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1827
1828 if (InitialHeapSize == 0) {
1829 julong reasonable_initial = phys_mem / InitialRAMFraction;
1830
1831 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1832 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1833
1834 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1835
1836 if (PrintGCDetails && Verbose) {
1837 // Cannot use gclog_or_tty yet.
1838 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1839 }
1840 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1841 }
1842 // If the minimum heap size has not been set (via -Xms),
1843 // synchronize with InitialHeapSize to avoid errors with the default value.
1844 if (min_heap_size() == 0) {
1845 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1846 if (PrintGCDetails && Verbose) {
1847 // Cannot use gclog_or_tty yet.
1848 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1849 }
1850 }
1851 }
1852 }
1853
1854 // This must be called after ergonomics.
1855 void Arguments::set_bytecode_flags() {
1856 if (!RewriteBytecodes) {
1857 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1858 }
1859 }
1860
1861 // Aggressive optimization flags -XX:+AggressiveOpts
1862 void Arguments::set_aggressive_opts_flags() {
1863 #ifdef COMPILER2
1864 if (AggressiveUnboxing) {
1865 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1866 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1867 } else if (!EliminateAutoBox) {
1868 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1869 AggressiveUnboxing = false;
1870 }
1871 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1872 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1873 } else if (!DoEscapeAnalysis) {
1874 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1875 AggressiveUnboxing = false;
1876 }
1877 }
1878 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1879 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1880 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1881 }
1882 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1883 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1884 }
1885
1886 // Feed the cache size setting into the JDK
1887 char buffer[1024];
1888 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1889 add_property(buffer);
1890 }
1891 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1892 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1893 }
1894 #endif
1895
1896 if (AggressiveOpts) {
1897 // Sample flag setting code
1898 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1899 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1900 // }
1901 }
1902 }
1903
1904 //===========================================================================================================
1905 // Parsing of java.compiler property
1906
1907 void Arguments::process_java_compiler_argument(char* arg) {
1908 // For backwards compatibility, Djava.compiler=NONE or ""
1909 // causes us to switch to -Xint mode UNLESS -Xdebug
1910 // is also specified.
1911 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1912 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1913 }
1914 }
1915
1916 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1917 _sun_java_launcher = os::strdup_check_oom(launcher);
1918 }
1919
1920 bool Arguments::created_by_java_launcher() {
1921 assert(_sun_java_launcher != NULL, "property must have value");
1922 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1923 }
1924
1925 bool Arguments::sun_java_launcher_is_altjvm() {
1926 return _sun_java_launcher_is_altjvm;
1927 }
1928
1929 //===========================================================================================================
1930 // Parsing of main arguments
1931
1932 bool Arguments::verify_interval(uintx val, uintx min,
1933 uintx max, const char* name) {
1934 // Returns true iff value is in the inclusive interval [min..max]
1935 // false, otherwise.
1936 if (val >= min && val <= max) {
1937 return true;
1938 }
1939 jio_fprintf(defaultStream::error_stream(),
1940 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1941 " and " UINTX_FORMAT "\n",
1942 name, val, min, max);
1943 return false;
1944 }
1945
1946 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1947 // Returns true if given value is at least specified min threshold
1948 // false, otherwise.
1949 if (val >= min ) {
1950 return true;
1951 }
1952 jio_fprintf(defaultStream::error_stream(),
1953 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1954 name, val, min);
1955 return false;
1956 }
1957
1958 bool Arguments::verify_percentage(uintx value, const char* name) {
1959 if (is_percentage(value)) {
1960 return true;
1961 }
1962 jio_fprintf(defaultStream::error_stream(),
1963 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1964 name, value);
1965 return false;
1966 }
1967
1968 // check if do gclog rotation
1969 // +UseGCLogFileRotation is a must,
1970 // no gc log rotation when log file not supplied or
1971 // NumberOfGCLogFiles is 0
1972 void check_gclog_consistency() {
1973 if (UseGCLogFileRotation) {
1974 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1975 jio_fprintf(defaultStream::output_stream(),
1976 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1977 "where num_of_file > 0\n"
1978 "GC log rotation is turned off\n");
1979 UseGCLogFileRotation = false;
1980 }
1981 }
1982
1983 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1984 FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K);
1985 jio_fprintf(defaultStream::output_stream(),
1986 "GCLogFileSize changed to minimum 8K\n");
1987 }
1988 }
1989
1990 // This function is called for -Xloggc:<filename>, it can be used
1991 // to check if a given file name(or string) conforms to the following
1992 // specification:
1993 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1994 // %p and %t only allowed once. We only limit usage of filename not path
1995 bool is_filename_valid(const char *file_name) {
1996 const char* p = file_name;
1997 char file_sep = os::file_separator()[0];
1998 const char* cp;
1999 // skip prefix path
2000 for (cp = file_name; *cp != '\0'; cp++) {
2001 if (*cp == '/' || *cp == file_sep) {
2002 p = cp + 1;
2003 }
2004 }
2005
2006 int count_p = 0;
2007 int count_t = 0;
2008 while (*p != '\0') {
2009 if ((*p >= '0' && *p <= '9') ||
2010 (*p >= 'A' && *p <= 'Z') ||
2011 (*p >= 'a' && *p <= 'z') ||
2012 *p == '-' ||
2013 *p == '_' ||
2014 *p == '.') {
2015 p++;
2016 continue;
2017 }
2018 if (*p == '%') {
2019 if(*(p + 1) == 'p') {
2020 p += 2;
2021 count_p ++;
2022 continue;
2023 }
2024 if (*(p + 1) == 't') {
2025 p += 2;
2026 count_t ++;
2027 continue;
2028 }
2029 }
2030 return false;
2031 }
2032 return count_p < 2 && count_t < 2;
2033 }
2034
2035 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2036 if (!is_percentage(min_heap_free_ratio)) {
2037 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2038 return false;
2039 }
2040 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2041 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2042 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2043 MaxHeapFreeRatio);
2044 return false;
2045 }
2046 // This does not set the flag itself, but stores the value in a safe place for later usage.
2047 _min_heap_free_ratio = min_heap_free_ratio;
2048 return true;
2049 }
2050
2051 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2052 if (!is_percentage(max_heap_free_ratio)) {
2053 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2054 return false;
2055 }
2056 if (max_heap_free_ratio < MinHeapFreeRatio) {
2057 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2058 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2059 MinHeapFreeRatio);
2060 return false;
2061 }
2062 // This does not set the flag itself, but stores the value in a safe place for later usage.
2063 _max_heap_free_ratio = max_heap_free_ratio;
2064 return true;
2065 }
2066
2067 // Check consistency of GC selection
2068 bool Arguments::check_gc_consistency() {
2069 check_gclog_consistency();
2070 // Ensure that the user has not selected conflicting sets
2071 // of collectors.
2072 uint i = 0;
2073 if (UseSerialGC) i++;
2074 if (UseConcMarkSweepGC) i++;
2075 if (UseParallelGC || UseParallelOldGC) i++;
2076 if (UseG1GC) i++;
2077 if (i > 1) {
2078 jio_fprintf(defaultStream::error_stream(),
2079 "Conflicting collector combinations in option list; "
2080 "please refer to the release notes for the combinations "
2081 "allowed\n");
2082 return false;
2083 }
2084
2085 if (UseConcMarkSweepGC && !UseParNewGC) {
2086 jio_fprintf(defaultStream::error_stream(),
2087 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2088 return false;
2089 }
2090
2091 if (UseParNewGC && !UseConcMarkSweepGC) {
2092 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
2093 // set up UseSerialGC properly, so that can't be used in the check here.
2094 jio_fprintf(defaultStream::error_stream(),
2095 "It is not possible to combine the ParNew young collector with the Serial old collector.\n");
2096 return false;
2097 }
2098
2099 return true;
2100 }
2101
2102 void Arguments::check_deprecated_gc_flags() {
2103 if (FLAG_IS_CMDLINE(UseParNewGC)) {
2104 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2105 }
2106 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2107 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2108 "and will likely be removed in future release");
2109 }
2110 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2111 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2112 "Use MaxRAMFraction instead.");
2113 }
2114 }
2115
2116 // Check stack pages settings
2117 bool Arguments::check_stack_pages()
2118 {
2119 bool status = true;
2120 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2121 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2122 // greater stack shadow pages can't generate instruction to bang stack
2123 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2124 return status;
2125 }
2126
2127 // Check the consistency of vm_init_args
2128 bool Arguments::check_vm_args_consistency() {
2129 // Method for adding checks for flag consistency.
2130 // The intent is to warn the user of all possible conflicts,
2131 // before returning an error.
2132 // Note: Needs platform-dependent factoring.
2133 bool status = true;
2134
2135 if (TLABRefillWasteFraction == 0) {
2136 jio_fprintf(defaultStream::error_stream(),
2137 "TLABRefillWasteFraction should be a denominator, "
2138 "not " SIZE_FORMAT "\n",
2139 TLABRefillWasteFraction);
2140 status = false;
2141 }
2142
2143 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2144 "AdaptiveSizePolicyWeight");
2145 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2146
2147 // Divide by bucket size to prevent a large size from causing rollover when
2148 // calculating amount of memory needed to be allocated for the String table.
2149 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2150 (max_uintx / StringTable::bucket_size()), "StringTable size");
2151
2152 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2153 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2154
2155 {
2156 // Using "else if" below to avoid printing two error messages if min > max.
2157 // This will also prevent us from reporting both min>100 and max>100 at the
2158 // same time, but that is less annoying than printing two identical errors IMHO.
2159 FormatBuffer<80> err_msg("%s","");
2160 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2161 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2162 status = false;
2163 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2164 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2165 status = false;
2166 }
2167 }
2168
2169 // Min/MaxMetaspaceFreeRatio
2170 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2171 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2172
2173 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2174 jio_fprintf(defaultStream::error_stream(),
2175 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2176 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2177 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2178 MinMetaspaceFreeRatio,
2179 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2180 MaxMetaspaceFreeRatio);
2181 status = false;
2182 }
2183
2184 // Trying to keep 100% free is not practical
2185 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2186
2187 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2188 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2189 }
2190
2191 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2192 // Settings to encourage splitting.
2193 if (!FLAG_IS_CMDLINE(NewRatio)) {
2194 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2195 }
2196 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2197 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2198 }
2199 }
2200
2201 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2202 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2203 }
2204
2205 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2206 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2207 if (GCTimeLimit == 100) {
2208 // Turn off gc-overhead-limit-exceeded checks
2209 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2210 }
2211
2212 status = status && check_gc_consistency();
2213 status = status && check_stack_pages();
2214
2215 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2216 "CMSIncrementalSafetyFactor");
2217
2218 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2219 // insists that we hold the requisite locks so that the iteration is
2220 // MT-safe. For the verification at start-up and shut-down, we don't
2221 // yet have a good way of acquiring and releasing these locks,
2222 // which are not visible at the CollectedHeap level. We want to
2223 // be able to acquire these locks and then do the iteration rather
2224 // than just disable the lock verification. This will be fixed under
2225 // bug 4788986.
2226 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2227 if (VerifyDuringStartup) {
2228 warning("Heap verification at start-up disabled "
2229 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2230 VerifyDuringStartup = false; // Disable verification at start-up
2231 }
2232
2233 if (VerifyBeforeExit) {
2234 warning("Heap verification at shutdown disabled "
2235 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2236 VerifyBeforeExit = false; // Disable verification at shutdown
2237 }
2238 }
2239
2240 // Note: only executed in non-PRODUCT mode
2241 if (!UseAsyncConcMarkSweepGC &&
2242 (ExplicitGCInvokesConcurrent ||
2243 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2244 jio_fprintf(defaultStream::error_stream(),
2245 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2246 " with -UseAsyncConcMarkSweepGC");
2247 status = false;
2248 }
2249
2250 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2251
2252 #if INCLUDE_ALL_GCS
2253 if (UseG1GC) {
2254 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2255 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2256 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2257
2258 status = status && verify_percentage(G1ConfidencePercent, "G1ConfidencePercent");
2259 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2260 "InitiatingHeapOccupancyPercent");
2261 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2262 "G1RefProcDrainInterval");
2263 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2264 "G1ConcMarkStepDurationMillis");
2265 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2266 "G1ConcRSHotCardLimit");
2267 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2268 "G1ConcRSLogCacheSize");
2269 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2270 "StringDeduplicationAgeThreshold");
2271 }
2272 if (UseConcMarkSweepGC) {
2273 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2274 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2275 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2276 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2277
2278 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2279
2280 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2281 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2282 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2283
2284 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2285
2286 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2287 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2288
2289 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2290 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2291 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2292
2293 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2294
2295 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2296
2297 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2298 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2299 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2300 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2301 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2302 }
2303
2304 if (UseParallelGC || UseParallelOldGC) {
2305 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2306 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2307
2308 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2309 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2310
2311 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2312 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2313
2314 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2315
2316 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2317 }
2318 #endif // INCLUDE_ALL_GCS
2319
2320 status = status && verify_interval(RefDiscoveryPolicy,
2321 ReferenceProcessor::DiscoveryPolicyMin,
2322 ReferenceProcessor::DiscoveryPolicyMax,
2323 "RefDiscoveryPolicy");
2324
2325 // Limit the lower bound of this flag to 1 as it is used in a division
2326 // expression.
2327 status = status && verify_interval(TLABWasteTargetPercent,
2328 1, 100, "TLABWasteTargetPercent");
2329
2330 status = status && verify_object_alignment();
2331
2332 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2333 "CompressedClassSpaceSize");
2334
2335 status = status && verify_interval(MarkStackSizeMax,
2336 1, (max_jint - 1), "MarkStackSizeMax");
2337 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2338
2339 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2340
2341 status = status && verify_min_value(HeapSizePerGCThread, (size_t) os::vm_page_size(), "HeapSizePerGCThread");
2342
2343 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2344
2345 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2346 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2347
2348 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2349
2350 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2351 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2352 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2353 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2354
2355 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2356 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2357
2358 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2359 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2360 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2361
2362 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2363 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2364
2365 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2366 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2367 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2368 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2369
2370 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2371 #ifdef COMPILER1
2372 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2373 #endif
2374 status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps");
2375
2376 if (PrintNMTStatistics) {
2377 #if INCLUDE_NMT
2378 if (MemTracker::tracking_level() == NMT_off) {
2379 #endif // INCLUDE_NMT
2380 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2381 PrintNMTStatistics = false;
2382 #if INCLUDE_NMT
2383 }
2384 #endif
2385 }
2386
2387 // Need to limit the extent of the padding to reasonable size.
2388 // 8K is well beyond the reasonable HW cache line size, even with the
2389 // aggressive prefetching, while still leaving the room for segregating
2390 // among the distinct pages.
2391 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2392 jio_fprintf(defaultStream::error_stream(),
2393 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2394 ContendedPaddingWidth, 0, 8192);
2395 status = false;
2396 }
2397
2398 // Need to enforce the padding not to break the existing field alignments.
2399 // It is sufficient to check against the largest type size.
2400 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2401 jio_fprintf(defaultStream::error_stream(),
2402 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2403 ContendedPaddingWidth, BytesPerLong);
2404 status = false;
2405 }
2406
2407 // Check lower bounds of the code cache
2408 // Template Interpreter code is approximately 3X larger in debug builds.
2409 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2410 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2411 jio_fprintf(defaultStream::error_stream(),
2412 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2413 os::vm_page_size()/K);
2414 status = false;
2415 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2416 jio_fprintf(defaultStream::error_stream(),
2417 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2418 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2419 status = false;
2420 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2421 jio_fprintf(defaultStream::error_stream(),
2422 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2423 min_code_cache_size/K);
2424 status = false;
2425 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2426 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2427 jio_fprintf(defaultStream::error_stream(),
2428 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2429 CODE_CACHE_SIZE_LIMIT/M);
2430 status = false;
2431 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2432 jio_fprintf(defaultStream::error_stream(),
2433 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2434 min_code_cache_size/K);
2435 status = false;
2436 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2437 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2438 jio_fprintf(defaultStream::error_stream(),
2439 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2440 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2441 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2442 status = false;
2443 }
2444
2445 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2446 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2447 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2448 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2449
2450
2451 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2452 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2453 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2454 // Check the minimum number of compiler threads
2455 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2456
2457 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2458 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2459 }
2460
2461 return status;
2462 }
2463
2464 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2465 const char* option_type) {
2466 if (ignore) return false;
2467
2468 const char* spacer = " ";
2469 if (option_type == NULL) {
2470 option_type = ++spacer; // Set both to the empty string.
2471 }
2472
2473 if (os::obsolete_option(option)) {
2474 jio_fprintf(defaultStream::error_stream(),
2475 "Obsolete %s%soption: %s\n", option_type, spacer,
2476 option->optionString);
2477 return false;
2478 } else {
2479 jio_fprintf(defaultStream::error_stream(),
2480 "Unrecognized %s%soption: %s\n", option_type, spacer,
2481 option->optionString);
2482 return true;
2483 }
2484 }
2485
2486 static const char* user_assertion_options[] = {
2487 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2488 };
2489
2490 static const char* system_assertion_options[] = {
2491 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2492 };
2493
2494 bool Arguments::parse_uintx(const char* value,
2495 uintx* uintx_arg,
2496 uintx min_size) {
2497
2498 // Check the sign first since atomull() parses only unsigned values.
2499 bool value_is_positive = !(*value == '-');
2500
2501 if (value_is_positive) {
2502 julong n;
2503 bool good_return = atomull(value, &n);
2504 if (good_return) {
2505 bool above_minimum = n >= min_size;
2506 bool value_is_too_large = n > max_uintx;
2507
2508 if (above_minimum && !value_is_too_large) {
2509 *uintx_arg = n;
2510 return true;
2511 }
2512 }
2513 }
2514 return false;
2515 }
2516
2517 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2518 julong* long_arg,
2519 julong min_size) {
2520 if (!atomull(s, long_arg)) return arg_unreadable;
2521 return check_memory_size(*long_arg, min_size);
2522 }
2523
2524 // Parse JavaVMInitArgs structure
2525
2526 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2527 // For components of the system classpath.
2528 SysClassPath scp(Arguments::get_sysclasspath());
2529 bool scp_assembly_required = false;
2530
2531 // Save default settings for some mode flags
2532 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2533 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2534 Arguments::_ClipInlining = ClipInlining;
2535 Arguments::_BackgroundCompilation = BackgroundCompilation;
2536
2537 // Setup flags for mixed which is the default
2538 set_mode_flags(_mixed);
2539
2540 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2541 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2542 if (result != JNI_OK) {
2543 return result;
2544 }
2545
2546 // Parse JavaVMInitArgs structure passed in
2547 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2548 if (result != JNI_OK) {
2549 return result;
2550 }
2551
2552 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2553 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2554 if (result != JNI_OK) {
2555 return result;
2556 }
2557
2558 // Do final processing now that all arguments have been parsed
2559 result = finalize_vm_init_args(&scp, scp_assembly_required);
2560 if (result != JNI_OK) {
2561 return result;
2562 }
2563
2564 return JNI_OK;
2565 }
2566
2567 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2568 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2569 // are dealing with -agentpath (case where name is a path), otherwise with
2570 // -agentlib
2571 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2572 char *_name;
2573 const char *_hprof = "hprof", *_jdwp = "jdwp";
2574 size_t _len_hprof, _len_jdwp, _len_prefix;
2575
2576 if (is_path) {
2577 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2578 return false;
2579 }
2580
2581 _name++; // skip past last path separator
2582 _len_prefix = strlen(JNI_LIB_PREFIX);
2583
2584 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2585 return false;
2586 }
2587
2588 _name += _len_prefix;
2589 _len_hprof = strlen(_hprof);
2590 _len_jdwp = strlen(_jdwp);
2591
2592 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2593 _name += _len_hprof;
2594 }
2595 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2596 _name += _len_jdwp;
2597 }
2598 else {
2599 return false;
2600 }
2601
2602 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2603 return false;
2604 }
2605
2606 return true;
2607 }
2608
2609 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2610 return true;
2611 }
2612
2613 return false;
2614 }
2615
2616 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2617 SysClassPath* scp_p,
2618 bool* scp_assembly_required_p,
2619 Flag::Flags origin) {
2620 // Remaining part of option string
2621 const char* tail;
2622
2623 // iterate over arguments
2624 for (int index = 0; index < args->nOptions; index++) {
2625 bool is_absolute_path = false; // for -agentpath vs -agentlib
2626
2627 const JavaVMOption* option = args->options + index;
2628
2629 if (!match_option(option, "-Djava.class.path", &tail) &&
2630 !match_option(option, "-Dsun.java.command", &tail) &&
2631 !match_option(option, "-Dsun.java.launcher", &tail)) {
2632
2633 // add all jvm options to the jvm_args string. This string
2634 // is used later to set the java.vm.args PerfData string constant.
2635 // the -Djava.class.path and the -Dsun.java.command options are
2636 // omitted from jvm_args string as each have their own PerfData
2637 // string constant object.
2638 build_jvm_args(option->optionString);
2639 }
2640
2641 // -verbose:[class/gc/jni]
2642 if (match_option(option, "-verbose", &tail)) {
2643 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2644 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2645 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2646 } else if (!strcmp(tail, ":gc")) {
2647 FLAG_SET_CMDLINE(bool, PrintGC, true);
2648 } else if (!strcmp(tail, ":jni")) {
2649 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2650 }
2651 // -da / -ea / -disableassertions / -enableassertions
2652 // These accept an optional class/package name separated by a colon, e.g.,
2653 // -da:java.lang.Thread.
2654 } else if (match_option(option, user_assertion_options, &tail, true)) {
2655 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2656 if (*tail == '\0') {
2657 JavaAssertions::setUserClassDefault(enable);
2658 } else {
2659 assert(*tail == ':', "bogus match by match_option()");
2660 JavaAssertions::addOption(tail + 1, enable);
2661 }
2662 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2663 } else if (match_option(option, system_assertion_options, &tail, false)) {
2664 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2665 JavaAssertions::setSystemClassDefault(enable);
2666 // -bootclasspath:
2667 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2668 scp_p->reset_path(tail);
2669 *scp_assembly_required_p = true;
2670 // -bootclasspath/a:
2671 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2672 scp_p->add_suffix(tail);
2673 *scp_assembly_required_p = true;
2674 // -bootclasspath/p:
2675 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2676 scp_p->add_prefix(tail);
2677 *scp_assembly_required_p = true;
2678 // -Xrun
2679 } else if (match_option(option, "-Xrun", &tail)) {
2680 if (tail != NULL) {
2681 const char* pos = strchr(tail, ':');
2682 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2683 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2684 name[len] = '\0';
2685
2686 char *options = NULL;
2687 if(pos != NULL) {
2688 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2689 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2690 }
2691 #if !INCLUDE_JVMTI
2692 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2693 jio_fprintf(defaultStream::error_stream(),
2694 "Profiling and debugging agents are not supported in this VM\n");
2695 return JNI_ERR;
2696 }
2697 #endif // !INCLUDE_JVMTI
2698 add_init_library(name, options);
2699 }
2700 // -agentlib and -agentpath
2701 } else if (match_option(option, "-agentlib:", &tail) ||
2702 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2703 if(tail != NULL) {
2704 const char* pos = strchr(tail, '=');
2705 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2706 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2707 name[len] = '\0';
2708
2709 char *options = NULL;
2710 if(pos != NULL) {
2711 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2712 }
2713 #if !INCLUDE_JVMTI
2714 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2715 jio_fprintf(defaultStream::error_stream(),
2716 "Profiling and debugging agents are not supported in this VM\n");
2717 return JNI_ERR;
2718 }
2719 #endif // !INCLUDE_JVMTI
2720 add_init_agent(name, options, is_absolute_path);
2721 }
2722 // -javaagent
2723 } else if (match_option(option, "-javaagent:", &tail)) {
2724 #if !INCLUDE_JVMTI
2725 jio_fprintf(defaultStream::error_stream(),
2726 "Instrumentation agents are not supported in this VM\n");
2727 return JNI_ERR;
2728 #else
2729 if(tail != NULL) {
2730 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2731 add_init_agent("instrument", options, false);
2732 }
2733 #endif // !INCLUDE_JVMTI
2734 // -Xnoclassgc
2735 } else if (match_option(option, "-Xnoclassgc")) {
2736 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2737 // -Xconcgc
2738 } else if (match_option(option, "-Xconcgc")) {
2739 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2740 // -Xnoconcgc
2741 } else if (match_option(option, "-Xnoconcgc")) {
2742 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2743 // -Xbatch
2744 } else if (match_option(option, "-Xbatch")) {
2745 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2746 // -Xmn for compatibility with other JVM vendors
2747 } else if (match_option(option, "-Xmn", &tail)) {
2748 julong long_initial_young_size = 0;
2749 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2750 if (errcode != arg_in_range) {
2751 jio_fprintf(defaultStream::error_stream(),
2752 "Invalid initial young generation size: %s\n", option->optionString);
2753 describe_range_error(errcode);
2754 return JNI_EINVAL;
2755 }
2756 FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size);
2757 FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size);
2758 // -Xms
2759 } else if (match_option(option, "-Xms", &tail)) {
2760 julong long_initial_heap_size = 0;
2761 // an initial heap size of 0 means automatically determine
2762 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2763 if (errcode != arg_in_range) {
2764 jio_fprintf(defaultStream::error_stream(),
2765 "Invalid initial heap size: %s\n", option->optionString);
2766 describe_range_error(errcode);
2767 return JNI_EINVAL;
2768 }
2769 set_min_heap_size((size_t)long_initial_heap_size);
2770 // Currently the minimum size and the initial heap sizes are the same.
2771 // Can be overridden with -XX:InitialHeapSize.
2772 FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size);
2773 // -Xmx
2774 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2775 julong long_max_heap_size = 0;
2776 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2777 if (errcode != arg_in_range) {
2778 jio_fprintf(defaultStream::error_stream(),
2779 "Invalid maximum heap size: %s\n", option->optionString);
2780 describe_range_error(errcode);
2781 return JNI_EINVAL;
2782 }
2783 FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size);
2784 // Xmaxf
2785 } else if (match_option(option, "-Xmaxf", &tail)) {
2786 char* err;
2787 int maxf = (int)(strtod(tail, &err) * 100);
2788 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2789 jio_fprintf(defaultStream::error_stream(),
2790 "Bad max heap free percentage size: %s\n",
2791 option->optionString);
2792 return JNI_EINVAL;
2793 } else {
2794 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2795 }
2796 // Xminf
2797 } else if (match_option(option, "-Xminf", &tail)) {
2798 char* err;
2799 int minf = (int)(strtod(tail, &err) * 100);
2800 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2801 jio_fprintf(defaultStream::error_stream(),
2802 "Bad min heap free percentage size: %s\n",
2803 option->optionString);
2804 return JNI_EINVAL;
2805 } else {
2806 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2807 }
2808 // -Xss
2809 } else if (match_option(option, "-Xss", &tail)) {
2810 julong long_ThreadStackSize = 0;
2811 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2812 if (errcode != arg_in_range) {
2813 jio_fprintf(defaultStream::error_stream(),
2814 "Invalid thread stack size: %s\n", option->optionString);
2815 describe_range_error(errcode);
2816 return JNI_EINVAL;
2817 }
2818 // Internally track ThreadStackSize in units of 1024 bytes.
2819 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2820 round_to((int)long_ThreadStackSize, K) / K);
2821 // -Xoss
2822 } else if (match_option(option, "-Xoss", &tail)) {
2823 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2824 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2825 julong long_CodeCacheExpansionSize = 0;
2826 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2827 if (errcode != arg_in_range) {
2828 jio_fprintf(defaultStream::error_stream(),
2829 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2830 os::vm_page_size()/K);
2831 return JNI_EINVAL;
2832 }
2833 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2834 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2835 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2836 julong long_ReservedCodeCacheSize = 0;
2837
2838 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2839 if (errcode != arg_in_range) {
2840 jio_fprintf(defaultStream::error_stream(),
2841 "Invalid maximum code cache size: %s.\n", option->optionString);
2842 return JNI_EINVAL;
2843 }
2844 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2845 // -XX:NonNMethodCodeHeapSize=
2846 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2847 julong long_NonNMethodCodeHeapSize = 0;
2848
2849 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2850 if (errcode != arg_in_range) {
2851 jio_fprintf(defaultStream::error_stream(),
2852 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2853 return JNI_EINVAL;
2854 }
2855 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
2856 // -XX:ProfiledCodeHeapSize=
2857 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2858 julong long_ProfiledCodeHeapSize = 0;
2859
2860 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2861 if (errcode != arg_in_range) {
2862 jio_fprintf(defaultStream::error_stream(),
2863 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2864 return JNI_EINVAL;
2865 }
2866 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2867 // -XX:NonProfiledCodeHeapSizee=
2868 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2869 julong long_NonProfiledCodeHeapSize = 0;
2870
2871 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2872 if (errcode != arg_in_range) {
2873 jio_fprintf(defaultStream::error_stream(),
2874 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2875 return JNI_EINVAL;
2876 }
2877 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2878 //-XX:IncreaseFirstTierCompileThresholdAt=
2879 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2880 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2881 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2882 jio_fprintf(defaultStream::error_stream(),
2883 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2884 option->optionString);
2885 return JNI_EINVAL;
2886 }
2887 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2888 // -green
2889 } else if (match_option(option, "-green")) {
2890 jio_fprintf(defaultStream::error_stream(),
2891 "Green threads support not available\n");
2892 return JNI_EINVAL;
2893 // -native
2894 } else if (match_option(option, "-native")) {
2895 // HotSpot always uses native threads, ignore silently for compatibility
2896 // -Xsqnopause
2897 } else if (match_option(option, "-Xsqnopause")) {
2898 // EVM option, ignore silently for compatibility
2899 // -Xrs
2900 } else if (match_option(option, "-Xrs")) {
2901 // Classic/EVM option, new functionality
2902 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2903 } else if (match_option(option, "-Xusealtsigs")) {
2904 // change default internal VM signals used - lower case for back compat
2905 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2906 // -Xoptimize
2907 } else if (match_option(option, "-Xoptimize")) {
2908 // EVM option, ignore silently for compatibility
2909 // -Xprof
2910 } else if (match_option(option, "-Xprof")) {
2911 #if INCLUDE_FPROF
2912 _has_profile = true;
2913 #else // INCLUDE_FPROF
2914 jio_fprintf(defaultStream::error_stream(),
2915 "Flat profiling is not supported in this VM.\n");
2916 return JNI_ERR;
2917 #endif // INCLUDE_FPROF
2918 // -Xconcurrentio
2919 } else if (match_option(option, "-Xconcurrentio")) {
2920 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2921 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2922 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2923 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2924 FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2925
2926 // -Xinternalversion
2927 } else if (match_option(option, "-Xinternalversion")) {
2928 jio_fprintf(defaultStream::output_stream(), "%s\n",
2929 VM_Version::internal_vm_info_string());
2930 vm_exit(0);
2931 #ifndef PRODUCT
2932 // -Xprintflags
2933 } else if (match_option(option, "-Xprintflags")) {
2934 CommandLineFlags::printFlags(tty, false);
2935 vm_exit(0);
2936 #endif
2937 // -D
2938 } else if (match_option(option, "-D", &tail)) {
2939 const char* value;
2940 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2941 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2942 // abort if -Djava.endorsed.dirs is set
2943 jio_fprintf(defaultStream::output_stream(),
2944 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2945 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2946 return JNI_EINVAL;
2947 }
2948 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2949 *value != '\0' && strcmp(value, "\"\"") != 0) {
2950 // abort if -Djava.ext.dirs is set
2951 jio_fprintf(defaultStream::output_stream(),
2952 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2953 return JNI_EINVAL;
2954 }
2955
2956 if (!add_property(tail)) {
2957 return JNI_ENOMEM;
2958 }
2959 // Out of the box management support
2960 if (match_option(option, "-Dcom.sun.management", &tail)) {
2961 #if INCLUDE_MANAGEMENT
2962 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2963 #else
2964 jio_fprintf(defaultStream::output_stream(),
2965 "-Dcom.sun.management is not supported in this VM.\n");
2966 return JNI_ERR;
2967 #endif
2968 }
2969 // -Xint
2970 } else if (match_option(option, "-Xint")) {
2971 set_mode_flags(_int);
2972 // -Xmixed
2973 } else if (match_option(option, "-Xmixed")) {
2974 set_mode_flags(_mixed);
2975 // -Xcomp
2976 } else if (match_option(option, "-Xcomp")) {
2977 // for testing the compiler; turn off all flags that inhibit compilation
2978 set_mode_flags(_comp);
2979 // -Xshare:dump
2980 } else if (match_option(option, "-Xshare:dump")) {
2981 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2982 set_mode_flags(_int); // Prevent compilation, which creates objects
2983 // -Xshare:on
2984 } else if (match_option(option, "-Xshare:on")) {
2985 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2986 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2987 // -Xshare:auto
2988 } else if (match_option(option, "-Xshare:auto")) {
2989 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2990 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2991 // -Xshare:off
2992 } else if (match_option(option, "-Xshare:off")) {
2993 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2994 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2995 // -Xverify
2996 } else if (match_option(option, "-Xverify", &tail)) {
2997 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2998 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2999 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3000 } else if (strcmp(tail, ":remote") == 0) {
3001 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3002 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3003 } else if (strcmp(tail, ":none") == 0) {
3004 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3005 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3006 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3007 return JNI_EINVAL;
3008 }
3009 // -Xdebug
3010 } else if (match_option(option, "-Xdebug")) {
3011 // note this flag has been used, then ignore
3012 set_xdebug_mode(true);
3013 // -Xnoagent
3014 } else if (match_option(option, "-Xnoagent")) {
3015 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3016 } else if (match_option(option, "-Xboundthreads")) {
3017 // Bind user level threads to kernel threads (Solaris only)
3018 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
3019 } else if (match_option(option, "-Xloggc:", &tail)) {
3020 // Redirect GC output to the file. -Xloggc:<filename>
3021 // ostream_init_log(), when called will use this filename
3022 // to initialize a fileStream.
3023 _gc_log_filename = os::strdup_check_oom(tail);
3024 if (!is_filename_valid(_gc_log_filename)) {
3025 jio_fprintf(defaultStream::output_stream(),
3026 "Invalid file name for use with -Xloggc: Filename can only contain the "
3027 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3028 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3029 return JNI_EINVAL;
3030 }
3031 FLAG_SET_CMDLINE(bool, PrintGC, true);
3032 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3033
3034 // JNI hooks
3035 } else if (match_option(option, "-Xcheck", &tail)) {
3036 if (!strcmp(tail, ":jni")) {
3037 #if !INCLUDE_JNI_CHECK
3038 warning("JNI CHECKING is not supported in this VM");
3039 #else
3040 CheckJNICalls = true;
3041 #endif // INCLUDE_JNI_CHECK
3042 } else if (is_bad_option(option, args->ignoreUnrecognized,
3043 "check")) {
3044 return JNI_EINVAL;
3045 }
3046 } else if (match_option(option, "vfprintf")) {
3047 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3048 } else if (match_option(option, "exit")) {
3049 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3050 } else if (match_option(option, "abort")) {
3051 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3052 // -XX:+AggressiveHeap
3053 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3054
3055 // This option inspects the machine and attempts to set various
3056 // parameters to be optimal for long-running, memory allocation
3057 // intensive jobs. It is intended for machines with large
3058 // amounts of cpu and memory.
3059
3060 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3061 // VM, but we may not be able to represent the total physical memory
3062 // available (like having 8gb of memory on a box but using a 32bit VM).
3063 // Thus, we need to make sure we're using a julong for intermediate
3064 // calculations.
3065 julong initHeapSize;
3066 julong total_memory = os::physical_memory();
3067
3068 if (total_memory < (julong)256*M) {
3069 jio_fprintf(defaultStream::error_stream(),
3070 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3071 vm_exit(1);
3072 }
3073
3074 // The heap size is half of available memory, or (at most)
3075 // all of possible memory less 160mb (leaving room for the OS
3076 // when using ISM). This is the maximum; because adaptive sizing
3077 // is turned on below, the actual space used may be smaller.
3078
3079 initHeapSize = MIN2(total_memory / (julong)2,
3080 total_memory - (julong)160*M);
3081
3082 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3083
3084 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3085 FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize);
3086 FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize);
3087 // Currently the minimum size and the initial heap sizes are the same.
3088 set_min_heap_size(initHeapSize);
3089 }
3090 if (FLAG_IS_DEFAULT(NewSize)) {
3091 // Make the young generation 3/8ths of the total heap.
3092 FLAG_SET_CMDLINE(size_t, NewSize,
3093 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3094 FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize);
3095 }
3096
3097 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3098 FLAG_SET_DEFAULT(UseLargePages, true);
3099 #endif
3100
3101 // Increase some data structure sizes for efficiency
3102 FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize);
3103 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3104 FLAG_SET_CMDLINE(size_t, TLABSize, 256*K);
3105
3106 // See the OldPLABSize comment below, but replace 'after promotion'
3107 // with 'after copying'. YoungPLABSize is the size of the survivor
3108 // space per-gc-thread buffers. The default is 4kw.
3109 FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K); // Note: this is in words
3110
3111 // OldPLABSize is the size of the buffers in the old gen that
3112 // UseParallelGC uses to promote live data that doesn't fit in the
3113 // survivor spaces. At any given time, there's one for each gc thread.
3114 // The default size is 1kw. These buffers are rarely used, since the
3115 // survivor spaces are usually big enough. For specjbb, however, there
3116 // are occasions when there's lots of live data in the young gen
3117 // and we end up promoting some of it. We don't have a definite
3118 // explanation for why bumping OldPLABSize helps, but the theory
3119 // is that a bigger PLAB results in retaining something like the
3120 // original allocation order after promotion, which improves mutator
3121 // locality. A minor effect may be that larger PLABs reduce the
3122 // number of PLAB allocation events during gc. The value of 8kw
3123 // was arrived at by experimenting with specjbb.
3124 FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K); // Note: this is in words
3125
3126 // Enable parallel GC and adaptive generation sizing
3127 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3128 FLAG_SET_DEFAULT(ParallelGCThreads,
3129 Abstract_VM_Version::parallel_worker_threads());
3130
3131 // Encourage steady state memory management
3132 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3133
3134 // This appears to improve mutator locality
3135 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3136
3137 // Get around early Solaris scheduling bug
3138 // (affinity vs other jobs on system)
3139 // but disallow DR and offlining (5008695).
3140 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3141
3142 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3143 // and the last option wins.
3144 } else if (match_option(option, "-XX:+NeverTenure")) {
3145 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3146 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3147 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3148 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3149 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3150 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3151 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3152 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3153 uintx max_tenuring_thresh = 0;
3154 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3155 jio_fprintf(defaultStream::error_stream(),
3156 "Improperly specified VM option 'MaxTenuringThreshold=%s'\n", tail);
3157 return JNI_EINVAL;
3158 }
3159 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3160
3161 if (MaxTenuringThreshold == 0) {
3162 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3163 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3164 } else {
3165 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3166 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3167 }
3168 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3169 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3170 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3171 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3172 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3173 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3174 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3175 #if defined(DTRACE_ENABLED)
3176 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3177 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3178 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3179 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3180 #else // defined(DTRACE_ENABLED)
3181 jio_fprintf(defaultStream::error_stream(),
3182 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3183 return JNI_EINVAL;
3184 #endif // defined(DTRACE_ENABLED)
3185 #ifdef ASSERT
3186 } else if (match_option(option, "-XX:+FullGCALot")) {
3187 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3188 // disable scavenge before parallel mark-compact
3189 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3190 #endif
3191 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3192 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3193 julong stack_size = 0;
3194 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3195 if (errcode != arg_in_range) {
3196 jio_fprintf(defaultStream::error_stream(),
3197 "Invalid mark stack size: %s\n", option->optionString);
3198 describe_range_error(errcode);
3199 return JNI_EINVAL;
3200 }
3201 jio_fprintf(defaultStream::error_stream(),
3202 "Please use -XX:MarkStackSize in place of "
3203 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n");
3204 FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size);
3205 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3206 julong max_stack_size = 0;
3207 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3208 if (errcode != arg_in_range) {
3209 jio_fprintf(defaultStream::error_stream(),
3210 "Invalid maximum mark stack size: %s\n",
3211 option->optionString);
3212 describe_range_error(errcode);
3213 return JNI_EINVAL;
3214 }
3215 jio_fprintf(defaultStream::error_stream(),
3216 "Please use -XX:MarkStackSizeMax in place of "
3217 "-XX:CMSMarkStackSizeMax in the future\n");
3218 FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size);
3219 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3220 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3221 uintx conc_threads = 0;
3222 if (!parse_uintx(tail, &conc_threads, 1)) {
3223 jio_fprintf(defaultStream::error_stream(),
3224 "Invalid concurrent threads: %s\n", option->optionString);
3225 return JNI_EINVAL;
3226 }
3227 jio_fprintf(defaultStream::error_stream(),
3228 "Please use -XX:ConcGCThreads in place of "
3229 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n");
3230 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3231 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3232 julong max_direct_memory_size = 0;
3233 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3234 if (errcode != arg_in_range) {
3235 jio_fprintf(defaultStream::error_stream(),
3236 "Invalid maximum direct memory size: %s\n",
3237 option->optionString);
3238 describe_range_error(errcode);
3239 return JNI_EINVAL;
3240 }
3241 FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size);
3242 #if !INCLUDE_MANAGEMENT
3243 } else if (match_option(option, "-XX:+ManagementServer")) {
3244 jio_fprintf(defaultStream::error_stream(),
3245 "ManagementServer is not supported in this VM.\n");
3246 return JNI_ERR;
3247 #endif // INCLUDE_MANAGEMENT
3248 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3249 // Skip -XX:Flags= since that case has already been handled
3250 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3251 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3252 return JNI_EINVAL;
3253 }
3254 }
3255 // Unknown option
3256 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3257 return JNI_ERR;
3258 }
3259 }
3260
3261 // PrintSharedArchiveAndExit will turn on
3262 // -Xshare:on
3263 // -XX:+TraceClassPaths
3264 if (PrintSharedArchiveAndExit) {
3265 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3266 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3267 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3268 }
3269
3270 // Change the default value for flags which have different default values
3271 // when working with older JDKs.
3272 #ifdef LINUX
3273 if (JDK_Version::current().compare_major(6) <= 0 &&
3274 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3275 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3276 }
3277 #endif // LINUX
3278 fix_appclasspath();
3279 return JNI_OK;
3280 }
3281
3282 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3283 //
3284 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3285 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3286 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3287 // path is treated as the current directory.
3288 //
3289 // This causes problems with CDS, which requires that all directories specified in the classpath
3290 // must be empty. In most cases, applications do NOT want to load classes from the current
3291 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3292 // scripts compatible with CDS.
3293 void Arguments::fix_appclasspath() {
3294 if (IgnoreEmptyClassPaths) {
3295 const char separator = *os::path_separator();
3296 const char* src = _java_class_path->value();
3297
3298 // skip over all the leading empty paths
3299 while (*src == separator) {
3300 src ++;
3301 }
3302
3303 char* copy = AllocateHeap(strlen(src) + 1, mtInternal);
3304 strncpy(copy, src, strlen(src) + 1);
3305
3306 // trim all trailing empty paths
3307 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3308 *tail = '\0';
3309 }
3310
3311 char from[3] = {separator, separator, '\0'};
3312 char to [2] = {separator, '\0'};
3313 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3314 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3315 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3316 }
3317
3318 _java_class_path->set_value(copy);
3319 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3320 }
3321
3322 if (!PrintSharedArchiveAndExit) {
3323 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3324 }
3325 }
3326
3327 static bool has_jar_files(const char* directory) {
3328 DIR* dir = os::opendir(directory);
3329 if (dir == NULL) return false;
3330
3331 struct dirent *entry;
3332 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3333 bool hasJarFile = false;
3334 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3335 const char* name = entry->d_name;
3336 const char* ext = name + strlen(name) - 4;
3337 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3338 }
3339 FREE_C_HEAP_ARRAY(char, dbuf);
3340 os::closedir(dir);
3341 return hasJarFile ;
3342 }
3343
3344 static int check_non_empty_dirs(const char* path) {
3345 const char separator = *os::path_separator();
3346 const char* const end = path + strlen(path);
3347 int nonEmptyDirs = 0;
3348 while (path < end) {
3349 const char* tmp_end = strchr(path, separator);
3350 if (tmp_end == NULL) {
3351 if (has_jar_files(path)) {
3352 nonEmptyDirs++;
3353 jio_fprintf(defaultStream::output_stream(),
3354 "Non-empty directory: %s\n", path);
3355 }
3356 path = end;
3357 } else {
3358 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3359 memcpy(dirpath, path, tmp_end - path);
3360 dirpath[tmp_end - path] = '\0';
3361 if (has_jar_files(dirpath)) {
3362 nonEmptyDirs++;
3363 jio_fprintf(defaultStream::output_stream(),
3364 "Non-empty directory: %s\n", dirpath);
3365 }
3366 FREE_C_HEAP_ARRAY(char, dirpath);
3367 path = tmp_end + 1;
3368 }
3369 }
3370 return nonEmptyDirs;
3371 }
3372
3373 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3374 // check if the default lib/endorsed directory exists; if so, error
3375 char path[JVM_MAXPATHLEN];
3376 const char* fileSep = os::file_separator();
3377 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3378
3379 if (CheckEndorsedAndExtDirs) {
3380 int nonEmptyDirs = 0;
3381 // check endorsed directory
3382 nonEmptyDirs += check_non_empty_dirs(path);
3383 // check the extension directories
3384 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3385 if (nonEmptyDirs > 0) {
3386 return JNI_ERR;
3387 }
3388 }
3389
3390 DIR* dir = os::opendir(path);
3391 if (dir != NULL) {
3392 jio_fprintf(defaultStream::output_stream(),
3393 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3394 "in modular form will be supported via the concept of upgradeable modules.\n");
3395 os::closedir(dir);
3396 return JNI_ERR;
3397 }
3398
3399 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3400 dir = os::opendir(path);
3401 if (dir != NULL) {
3402 jio_fprintf(defaultStream::output_stream(),
3403 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3404 "Use -classpath instead.\n.");
3405 os::closedir(dir);
3406 return JNI_ERR;
3407 }
3408
3409 if (scp_assembly_required) {
3410 // Assemble the bootclasspath elements into the final path.
3411 Arguments::set_sysclasspath(scp_p->combined_path());
3412 }
3413
3414 // This must be done after all arguments have been processed.
3415 // java_compiler() true means set to "NONE" or empty.
3416 if (java_compiler() && !xdebug_mode()) {
3417 // For backwards compatibility, we switch to interpreted mode if
3418 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3419 // not specified.
3420 set_mode_flags(_int);
3421 }
3422
3423 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3424 // but like -Xint, leave compilation thresholds unaffected.
3425 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3426 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3427 set_mode_flags(_int);
3428 }
3429
3430 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3431 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3432 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3433 }
3434
3435 #ifndef COMPILER2
3436 // Don't degrade server performance for footprint
3437 if (FLAG_IS_DEFAULT(UseLargePages) &&
3438 MaxHeapSize < LargePageHeapSizeThreshold) {
3439 // No need for large granularity pages w/small heaps.
3440 // Note that large pages are enabled/disabled for both the
3441 // Java heap and the code cache.
3442 FLAG_SET_DEFAULT(UseLargePages, false);
3443 }
3444
3445 #else
3446 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3447 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3448 }
3449 #endif
3450
3451 #ifndef TIERED
3452 // Tiered compilation is undefined.
3453 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3454 #endif
3455
3456 // If we are running in a headless jre, force java.awt.headless property
3457 // to be true unless the property has already been set.
3458 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3459 if (os::is_headless_jre()) {
3460 const char* headless = Arguments::get_property("java.awt.headless");
3461 if (headless == NULL) {
3462 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3463 if (headless_env == NULL) {
3464 if (!add_property("java.awt.headless=true")) {
3465 return JNI_ENOMEM;
3466 }
3467 } else {
3468 char buffer[256];
3469 const char *key = "java.awt.headless=";
3470 strcpy(buffer, key);
3471 strncat(buffer, headless_env, 256 - strlen(key) - 1);
3472 if (!add_property(buffer)) {
3473 return JNI_ENOMEM;
3474 }
3475 }
3476 }
3477 }
3478
3479 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3480 // CMS can only be used with ParNew
3481 FLAG_SET_ERGO(bool, UseParNewGC, true);
3482 }
3483
3484 if (!check_vm_args_consistency()) {
3485 return JNI_ERR;
3486 }
3487
3488 return JNI_OK;
3489 }
3490
3491 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3492 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3493 scp_assembly_required_p);
3494 }
3495
3496 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3497 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3498 scp_assembly_required_p);
3499 }
3500
3501 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3502 char *buffer = ::getenv(name);
3503
3504 // Don't check this variable if user has special privileges
3505 // (e.g. unix su command).
3506 if (buffer == NULL || os::have_special_privileges()) {
3507 return JNI_OK;
3508 }
3509
3510 if ((buffer = os::strdup(buffer)) == NULL) {
3511 return JNI_ENOMEM;
3512 }
3513
3514 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3515 jio_fprintf(defaultStream::error_stream(),
3516 "Picked up %s: %s\n", name, buffer);
3517 char* rd = buffer; // pointer to the input string (rd)
3518 while (true) { // 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 JavaVMOption option;
3528 option.optionString = wrt;
3529 options->append(option); // Fill in option
3530 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3531 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3532 int quote = *rd; // matching quote to look for
3533 rd++; // don't copy open quote
3534 while (*rd != quote) { // include everything (even spaces) up until quote
3535 if (*rd == 0) { // string termination means unmatched string
3536 jio_fprintf(defaultStream::error_stream(),
3537 "Unmatched quote in %s\n", name);
3538 delete options;
3539 os::free(buffer);
3540 return JNI_ERR;
3541 }
3542 *wrt++ = *rd++; // copy to option string
3543 }
3544 rd++; // don't copy close quote
3545 } else {
3546 *wrt++ = *rd++; // copy to option string
3547 }
3548 }
3549 // Need to check if we're done before writing a NULL,
3550 // because the write could be to the byte that rd is pointing to.
3551 if (*rd++ == 0) {
3552 *wrt = 0;
3553 break;
3554 }
3555 *wrt = 0; // Zero terminate option
3556 }
3557 JavaVMOption* options_arr =
3558 NEW_C_HEAP_ARRAY_RETURN_NULL(JavaVMOption, options->length(), mtInternal);
3559 if (options_arr == NULL) {
3560 delete options;
3561 os::free(buffer);
3562 return JNI_ENOMEM;
3563 }
3564 for (int i = 0; i < options->length(); i++) {
3565 options_arr[i] = options->at(i);
3566 }
3567
3568 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3569 JavaVMInitArgs vm_args;
3570 vm_args.version = JNI_VERSION_1_2;
3571 vm_args.options = options_arr;
3572 vm_args.nOptions = options->length();
3573 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3574
3575 if (PrintVMOptions) {
3576 const char* tail;
3577 for (int i = 0; i < vm_args.nOptions; i++) {
3578 const JavaVMOption *option = vm_args.options + i;
3579 if (match_option(option, "-XX:", &tail)) {
3580 logOption(tail);
3581 }
3582 }
3583 }
3584
3585 jint result = parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p,
3586 Flag::ENVIRON_VAR);
3587 FREE_C_HEAP_ARRAY(JavaVMOption, options_arr);
3588 delete options;
3589 os::free(buffer);
3590 return result;
3591 }
3592
3593 void Arguments::set_shared_spaces_flags() {
3594 if (DumpSharedSpaces) {
3595 if (RequireSharedSpaces) {
3596 warning("cannot dump shared archive while using shared archive");
3597 }
3598 UseSharedSpaces = false;
3599 #ifdef _LP64
3600 if (!UseCompressedOops || !UseCompressedClassPointers) {
3601 vm_exit_during_initialization(
3602 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3603 }
3604 } else {
3605 if (!UseCompressedOops || !UseCompressedClassPointers) {
3606 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3607 }
3608 #endif
3609 }
3610 }
3611
3612 #if !INCLUDE_ALL_GCS
3613 static void force_serial_gc() {
3614 FLAG_SET_DEFAULT(UseSerialGC, true);
3615 UNSUPPORTED_GC_OPTION(UseG1GC);
3616 UNSUPPORTED_GC_OPTION(UseParallelGC);
3617 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3618 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3619 UNSUPPORTED_GC_OPTION(UseParNewGC);
3620 }
3621 #endif // INCLUDE_ALL_GCS
3622
3623 // Sharing support
3624 // Construct the path to the archive
3625 static char* get_shared_archive_path() {
3626 char *shared_archive_path;
3627 if (SharedArchiveFile == NULL) {
3628 char jvm_path[JVM_MAXPATHLEN];
3629 os::jvm_path(jvm_path, sizeof(jvm_path));
3630 char *end = strrchr(jvm_path, *os::file_separator());
3631 if (end != NULL) *end = '\0';
3632 size_t jvm_path_len = strlen(jvm_path);
3633 size_t file_sep_len = strlen(os::file_separator());
3634 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3635 file_sep_len + 20, mtInternal);
3636 if (shared_archive_path != NULL) {
3637 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3638 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3639 strncat(shared_archive_path, "classes.jsa", 11);
3640 }
3641 } else {
3642 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3643 if (shared_archive_path != NULL) {
3644 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3645 }
3646 }
3647 return shared_archive_path;
3648 }
3649
3650 #ifndef PRODUCT
3651 // Determine whether LogVMOutput should be implicitly turned on.
3652 static bool use_vm_log() {
3653 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3654 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3655 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3656 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3657 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3658 return true;
3659 }
3660
3661 #ifdef COMPILER1
3662 if (PrintC1Statistics) {
3663 return true;
3664 }
3665 #endif // COMPILER1
3666
3667 #ifdef COMPILER2
3668 if (PrintOptoAssembly || PrintOptoStatistics) {
3669 return true;
3670 }
3671 #endif // COMPILER2
3672
3673 return false;
3674 }
3675 #endif // PRODUCT
3676
3677 // Parse entry point called from JNI_CreateJavaVM
3678
3679 jint Arguments::parse(const JavaVMInitArgs* args) {
3680
3681 // Remaining part of option string
3682 const char* tail;
3683
3684 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3685 const char* hotspotrc = ".hotspotrc";
3686 bool settings_file_specified = false;
3687 bool needs_hotspotrc_warning = false;
3688
3689 const char* flags_file;
3690 int index;
3691 for (index = 0; index < args->nOptions; index++) {
3692 const JavaVMOption *option = args->options + index;
3693 if (ArgumentsExt::process_options(option)) {
3694 continue;
3695 }
3696 if (match_option(option, "-XX:Flags=", &tail)) {
3697 flags_file = tail;
3698 settings_file_specified = true;
3699 continue;
3700 }
3701 if (match_option(option, "-XX:+PrintVMOptions")) {
3702 PrintVMOptions = true;
3703 continue;
3704 }
3705 if (match_option(option, "-XX:-PrintVMOptions")) {
3706 PrintVMOptions = false;
3707 continue;
3708 }
3709 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3710 IgnoreUnrecognizedVMOptions = true;
3711 continue;
3712 }
3713 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3714 IgnoreUnrecognizedVMOptions = false;
3715 continue;
3716 }
3717 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3718 CommandLineFlags::printFlags(tty, false);
3719 vm_exit(0);
3720 }
3721 #if INCLUDE_NMT
3722 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3723 // The launcher did not setup nmt environment variable properly.
3724 if (!MemTracker::check_launcher_nmt_support(tail)) {
3725 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3726 }
3727
3728 // Verify if nmt option is valid.
3729 if (MemTracker::verify_nmt_option()) {
3730 // Late initialization, still in single-threaded mode.
3731 if (MemTracker::tracking_level() >= NMT_summary) {
3732 MemTracker::init();
3733 }
3734 } else {
3735 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3736 }
3737 continue;
3738 }
3739 #endif
3740
3741
3742 #ifndef PRODUCT
3743 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3744 CommandLineFlags::printFlags(tty, true);
3745 vm_exit(0);
3746 }
3747 #endif
3748 }
3749
3750 if (IgnoreUnrecognizedVMOptions) {
3751 // uncast const to modify the flag args->ignoreUnrecognized
3752 *(jboolean*)(&args->ignoreUnrecognized) = true;
3753 }
3754
3755 // Parse specified settings file
3756 if (settings_file_specified) {
3757 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3758 return JNI_EINVAL;
3759 }
3760 } else {
3761 #ifdef ASSERT
3762 // Parse default .hotspotrc settings file
3763 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3764 return JNI_EINVAL;
3765 }
3766 #else
3767 struct stat buf;
3768 if (os::stat(hotspotrc, &buf) == 0) {
3769 needs_hotspotrc_warning = true;
3770 }
3771 #endif
3772 }
3773
3774 if (PrintVMOptions) {
3775 for (index = 0; index < args->nOptions; index++) {
3776 const JavaVMOption *option = args->options + index;
3777 if (match_option(option, "-XX:", &tail)) {
3778 logOption(tail);
3779 }
3780 }
3781 }
3782
3783 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3784 jint result = parse_vm_init_args(args);
3785 if (result != JNI_OK) {
3786 return result;
3787 }
3788
3789 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3790 SharedArchivePath = get_shared_archive_path();
3791 if (SharedArchivePath == NULL) {
3792 return JNI_ENOMEM;
3793 }
3794
3795 // Set up VerifySharedSpaces
3796 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3797 VerifySharedSpaces = true;
3798 }
3799
3800 // Delay warning until here so that we've had a chance to process
3801 // the -XX:-PrintWarnings flag
3802 if (needs_hotspotrc_warning) {
3803 warning("%s file is present but has been ignored. "
3804 "Run with -XX:Flags=%s to load the file.",
3805 hotspotrc, hotspotrc);
3806 }
3807
3808 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3809 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3810 #endif
3811
3812 ArgumentsExt::report_unsupported_options();
3813
3814 #ifndef PRODUCT
3815 if (TraceBytecodesAt != 0) {
3816 TraceBytecodes = true;
3817 }
3818 if (CountCompiledCalls) {
3819 if (UseCounterDecay) {
3820 warning("UseCounterDecay disabled because CountCalls is set");
3821 UseCounterDecay = false;
3822 }
3823 }
3824 #endif // PRODUCT
3825
3826 if (ScavengeRootsInCode == 0) {
3827 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3828 warning("forcing ScavengeRootsInCode non-zero");
3829 }
3830 ScavengeRootsInCode = 1;
3831 }
3832
3833 if (PrintGCDetails) {
3834 // Turn on -verbose:gc options as well
3835 PrintGC = true;
3836 }
3837
3838 // Set object alignment values.
3839 set_object_alignment();
3840
3841 #if !INCLUDE_ALL_GCS
3842 force_serial_gc();
3843 #endif // INCLUDE_ALL_GCS
3844 #if !INCLUDE_CDS
3845 if (DumpSharedSpaces || RequireSharedSpaces) {
3846 jio_fprintf(defaultStream::error_stream(),
3847 "Shared spaces are not supported in this VM\n");
3848 return JNI_ERR;
3849 }
3850 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3851 warning("Shared spaces are not supported in this VM");
3852 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3853 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3854 }
3855 no_shared_spaces("CDS Disabled");
3856 #endif // INCLUDE_CDS
3857
3858 return JNI_OK;
3859 }
3860
3861 jint Arguments::apply_ergo() {
3862
3863 // Set flags based on ergonomics.
3864 set_ergonomics_flags();
3865
3866 set_shared_spaces_flags();
3867
3868 // Check the GC selections again.
3869 if (!check_gc_consistency()) {
3870 return JNI_EINVAL;
3871 }
3872
3873 if (TieredCompilation) {
3874 set_tiered_flags();
3875 } else {
3876 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3877 if (CompilationPolicyChoice >= 2) {
3878 vm_exit_during_initialization(
3879 "Incompatible compilation policy selected", NULL);
3880 }
3881 // Scale CompileThreshold
3882 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
3883 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
3884 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
3885 }
3886 }
3887
3888 #ifdef COMPILER2
3889 #ifndef PRODUCT
3890 if (PrintIdealGraphLevel > 0) {
3891 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3892 }
3893 #endif
3894 #endif
3895
3896 // Set heap size based on available physical memory
3897 set_heap_size();
3898
3899 ArgumentsExt::set_gc_specific_flags();
3900
3901 // Initialize Metaspace flags and alignments
3902 Metaspace::ergo_initialize();
3903
3904 // Set bytecode rewriting flags
3905 set_bytecode_flags();
3906
3907 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3908 set_aggressive_opts_flags();
3909
3910 // Turn off biased locking for locking debug mode flags,
3911 // which are subtly different from each other but neither works with
3912 // biased locking
3913 if (UseHeavyMonitors
3914 #ifdef COMPILER1
3915 || !UseFastLocking
3916 #endif // COMPILER1
3917 ) {
3918 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3919 // flag set to true on command line; warn the user that they
3920 // can't enable biased locking here
3921 warning("Biased Locking is not supported with locking debug flags"
3922 "; ignoring UseBiasedLocking flag." );
3923 }
3924 UseBiasedLocking = false;
3925 }
3926
3927 #ifdef ZERO
3928 // Clear flags not supported on zero.
3929 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3930 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3931 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3932 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3933 #endif // CC_INTERP
3934
3935 #ifdef COMPILER2
3936 if (!EliminateLocks) {
3937 EliminateNestedLocks = false;
3938 }
3939 if (!Inline) {
3940 IncrementalInline = false;
3941 }
3942 #ifndef PRODUCT
3943 if (!IncrementalInline) {
3944 AlwaysIncrementalInline = false;
3945 }
3946 #endif
3947 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3948 // nothing to use the profiling, turn if off
3949 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3950 }
3951 #endif
3952
3953 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3954 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3955 DebugNonSafepoints = true;
3956 }
3957
3958 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3959 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3960 }
3961
3962 #ifndef PRODUCT
3963 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3964 if (use_vm_log()) {
3965 LogVMOutput = true;
3966 }
3967 }
3968 #endif // PRODUCT
3969
3970 if (PrintCommandLineFlags) {
3971 CommandLineFlags::printSetFlags(tty);
3972 }
3973
3974 // Apply CPU specific policy for the BiasedLocking
3975 if (UseBiasedLocking) {
3976 if (!VM_Version::use_biased_locking() &&
3977 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3978 UseBiasedLocking = false;
3979 }
3980 }
3981 #ifdef COMPILER2
3982 if (!UseBiasedLocking || EmitSync != 0) {
3983 UseOptoBiasInlining = false;
3984 }
3985 #endif
3986
3987 return JNI_OK;
3988 }
3989
3990 jint Arguments::adjust_after_os() {
3991 if (UseNUMA) {
3992 if (UseParallelGC || UseParallelOldGC) {
3993 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3994 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3995 }
3996 }
3997 // UseNUMAInterleaving is set to ON for all collectors and
3998 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3999 // such as the parallel collector for Linux and Solaris will
4000 // interleave old gen and survivor spaces on top of NUMA
4001 // allocation policy for the eden space.
4002 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4003 // all platforms and ParallelGC on Windows will interleave all
4004 // of the heap spaces across NUMA nodes.
4005 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4006 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4007 }
4008 }
4009 return JNI_OK;
4010 }
4011
4012 int Arguments::PropertyList_count(SystemProperty* pl) {
4013 int count = 0;
4014 while(pl != NULL) {
4015 count++;
4016 pl = pl->next();
4017 }
4018 return count;
4019 }
4020
4021 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4022 assert(key != NULL, "just checking");
4023 SystemProperty* prop;
4024 for (prop = pl; prop != NULL; prop = prop->next()) {
4025 if (strcmp(key, prop->key()) == 0) return prop->value();
4026 }
4027 return NULL;
4028 }
4029
4030 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4031 int count = 0;
4032 const char* ret_val = NULL;
4033
4034 while(pl != NULL) {
4035 if(count >= index) {
4036 ret_val = pl->key();
4037 break;
4038 }
4039 count++;
4040 pl = pl->next();
4041 }
4042
4043 return ret_val;
4044 }
4045
4046 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4047 int count = 0;
4048 char* ret_val = NULL;
4049
4050 while(pl != NULL) {
4051 if(count >= index) {
4052 ret_val = pl->value();
4053 break;
4054 }
4055 count++;
4056 pl = pl->next();
4057 }
4058
4059 return ret_val;
4060 }
4061
4062 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4063 SystemProperty* p = *plist;
4064 if (p == NULL) {
4065 *plist = new_p;
4066 } else {
4067 while (p->next() != NULL) {
4068 p = p->next();
4069 }
4070 p->set_next(new_p);
4071 }
4072 }
4073
4074 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4075 if (plist == NULL)
4076 return;
4077
4078 SystemProperty* new_p = new SystemProperty(k, v, true);
4079 PropertyList_add(plist, new_p);
4080 }
4081
4082 void Arguments::PropertyList_add(SystemProperty *element) {
4083 PropertyList_add(&_system_properties, element);
4084 }
4085
4086 // This add maintains unique property key in the list.
4087 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4088 if (plist == NULL)
4089 return;
4090
4091 // If property key exist then update with new value.
4092 SystemProperty* prop;
4093 for (prop = *plist; prop != NULL; prop = prop->next()) {
4094 if (strcmp(k, prop->key()) == 0) {
4095 if (append) {
4096 prop->append_value(v);
4097 } else {
4098 prop->set_value(v);
4099 }
4100 return;
4101 }
4102 }
4103
4104 PropertyList_add(plist, k, v);
4105 }
4106
4107 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4108 // Returns true if all of the source pointed by src has been copied over to
4109 // the destination buffer pointed by buf. Otherwise, returns false.
4110 // Notes:
4111 // 1. If the length (buflen) of the destination buffer excluding the
4112 // NULL terminator character is not long enough for holding the expanded
4113 // pid characters, it also returns false instead of returning the partially
4114 // expanded one.
4115 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4116 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4117 char* buf, size_t buflen) {
4118 const char* p = src;
4119 char* b = buf;
4120 const char* src_end = &src[srclen];
4121 char* buf_end = &buf[buflen - 1];
4122
4123 while (p < src_end && b < buf_end) {
4124 if (*p == '%') {
4125 switch (*(++p)) {
4126 case '%': // "%%" ==> "%"
4127 *b++ = *p++;
4128 break;
4129 case 'p': { // "%p" ==> current process id
4130 // buf_end points to the character before the last character so
4131 // that we could write '\0' to the end of the buffer.
4132 size_t buf_sz = buf_end - b + 1;
4133 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4134
4135 // if jio_snprintf fails or the buffer is not long enough to hold
4136 // the expanded pid, returns false.
4137 if (ret < 0 || ret >= (int)buf_sz) {
4138 return false;
4139 } else {
4140 b += ret;
4141 assert(*b == '\0', "fail in copy_expand_pid");
4142 if (p == src_end && b == buf_end + 1) {
4143 // reach the end of the buffer.
4144 return true;
4145 }
4146 }
4147 p++;
4148 break;
4149 }
4150 default :
4151 *b++ = '%';
4152 }
4153 } else {
4154 *b++ = *p++;
4155 }
4156 }
4157 *b = '\0';
4158 return (p == src_end); // return false if not all of the source was copied
4159 }