1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "compiler/compilerOracle.hpp"
31 #include "gc/shared/cardTableRS.hpp"
32 #include "gc/shared/genCollectedHeap.hpp"
33 #include "gc/shared/referenceProcessor.hpp"
34 #include "gc/shared/taskqueue.hpp"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/universe.inline.hpp"
37 #include "oops/oop.inline.hpp"
38 #include "prims/jvmtiExport.hpp"
39 #include "runtime/arguments.hpp"
40 #include "runtime/arguments_ext.hpp"
41 #include "runtime/globals_extension.hpp"
42 #include "runtime/java.hpp"
43 #include "runtime/os.hpp"
44 #include "runtime/vm_version.hpp"
45 #include "services/management.hpp"
46 #include "services/memTracker.hpp"
47 #include "utilities/defaultStream.hpp"
48 #include "utilities/macros.hpp"
49 #include "utilities/stringUtils.hpp"
50 #if INCLUDE_ALL_GCS
51 #include "gc/cms/compactibleFreeListSpace.hpp"
52 #include "gc/g1/g1CollectedHeap.inline.hpp"
53 #include "gc/parallel/parallelScavengeHeap.hpp"
54 #endif // INCLUDE_ALL_GCS
55
56 // Note: This is a special bug reporting site for the JVM
57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
58 #define DEFAULT_JAVA_LAUNCHER "generic"
59
60 #define UNSUPPORTED_GC_OPTION(gc) \
61 do { \
62 if (gc) { \
63 if (FLAG_IS_CMDLINE(gc)) { \
64 warning(#gc " is not supported in this VM. Using Serial GC."); \
65 } \
66 FLAG_SET_DEFAULT(gc, false); \
67 } \
68 } while(0)
69
70 char** Arguments::_jvm_flags_array = NULL;
71 int Arguments::_num_jvm_flags = 0;
72 char** Arguments::_jvm_args_array = NULL;
73 int Arguments::_num_jvm_args = 0;
74 char* Arguments::_java_command = NULL;
75 SystemProperty* Arguments::_system_properties = NULL;
76 const char* Arguments::_gc_log_filename = NULL;
77 bool Arguments::_has_profile = false;
78 size_t Arguments::_conservative_max_heap_alignment = 0;
79 size_t Arguments::_min_heap_size = 0;
80 uintx Arguments::_min_heap_free_ratio = 0;
81 uintx Arguments::_max_heap_free_ratio = 0;
82 Arguments::Mode Arguments::_mode = _mixed;
83 bool Arguments::_java_compiler = false;
84 bool Arguments::_xdebug_mode = false;
85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
87 int Arguments::_sun_java_launcher_pid = -1;
88 bool Arguments::_sun_java_launcher_is_altjvm = false;
89
90 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
93 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
94 bool Arguments::_ClipInlining = ClipInlining;
95 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
96 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
97
98 char* Arguments::SharedArchivePath = NULL;
99
100 AgentLibraryList Arguments::_libraryList;
101 AgentLibraryList Arguments::_agentList;
102
103 abort_hook_t Arguments::_abort_hook = NULL;
104 exit_hook_t Arguments::_exit_hook = NULL;
105 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
106
107
108 SystemProperty *Arguments::_sun_boot_library_path = NULL;
109 SystemProperty *Arguments::_java_library_path = NULL;
110 SystemProperty *Arguments::_java_home = NULL;
111 SystemProperty *Arguments::_java_class_path = NULL;
112 SystemProperty *Arguments::_sun_boot_class_path = NULL;
113
114 char* Arguments::_ext_dirs = NULL;
115
116 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
117 // part of the option string.
118 static bool match_option(const JavaVMOption *option, const char* name,
119 const char** tail) {
120 int len = (int)strlen(name);
121 if (strncmp(option->optionString, name, len) == 0) {
122 *tail = option->optionString + len;
123 return true;
124 } else {
125 return false;
126 }
127 }
128
129 // Check if 'option' matches 'name'. No "tail" is allowed.
130 static bool match_option(const JavaVMOption *option, const char* name) {
131 const char* tail = NULL;
132 bool result = match_option(option, name, &tail);
133 if (tail != NULL && *tail == '\0') {
134 return result;
135 } else {
136 return false;
137 }
138 }
139
140 // Return true if any of the strings in null-terminated array 'names' matches.
141 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
142 // the option must match exactly.
143 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
144 bool tail_allowed) {
145 for (/* empty */; *names != NULL; ++names) {
146 if (match_option(option, *names, tail)) {
147 if (**tail == '\0' || tail_allowed && **tail == ':') {
148 return true;
149 }
150 }
151 }
152 return false;
153 }
154
155 static void logOption(const char* opt) {
156 if (PrintVMOptions) {
157 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
158 }
159 }
160
161 // Process java launcher properties.
162 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
163 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
164 // sun.java.launcher.pid is defined.
165 // Must do this before setting up other system properties,
166 // as some of them may depend on launcher type.
167 for (int index = 0; index < args->nOptions; index++) {
168 const JavaVMOption* option = args->options + index;
169 const char* tail;
170
171 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
172 process_java_launcher_argument(tail, option->extraInfo);
173 continue;
174 }
175 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
176 if (strcmp(tail, "true") == 0) {
177 _sun_java_launcher_is_altjvm = true;
178 }
179 continue;
180 }
181 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
182 _sun_java_launcher_pid = atoi(tail);
183 continue;
184 }
185 }
186 }
187
188 // Initialize system properties key and value.
189 void Arguments::init_system_properties() {
190
191 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
192 "Java Virtual Machine Specification", false));
193 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
194 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
195 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
196
197 // Following are JVMTI agent writable properties.
198 // Properties values are set to NULL and they are
199 // os specific they are initialized in os::init_system_properties_values().
200 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
201 _java_library_path = new SystemProperty("java.library.path", NULL, true);
202 _java_home = new SystemProperty("java.home", NULL, true);
203 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
204
205 _java_class_path = new SystemProperty("java.class.path", "", true);
206
207 // Add to System Property list.
208 PropertyList_add(&_system_properties, _sun_boot_library_path);
209 PropertyList_add(&_system_properties, _java_library_path);
210 PropertyList_add(&_system_properties, _java_home);
211 PropertyList_add(&_system_properties, _java_class_path);
212 PropertyList_add(&_system_properties, _sun_boot_class_path);
213
214 // Set OS specific system properties values
215 os::init_system_properties_values();
216 }
217
218
219 // Update/Initialize System properties after JDK version number is known
220 void Arguments::init_version_specific_system_properties() {
221 enum { bufsz = 16 };
222 char buffer[bufsz];
223 const char* spec_vendor = "Sun Microsystems Inc.";
224 uint32_t spec_version = 0;
225
226 spec_vendor = "Oracle Corporation";
227 spec_version = JDK_Version::current().major_version();
228 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
229
230 PropertyList_add(&_system_properties,
231 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.specification.version", buffer, false));
234 PropertyList_add(&_system_properties,
235 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
236 }
237
238 /**
239 * Provide a slightly more user-friendly way of eliminating -XX flags.
240 * When a flag is eliminated, it can be added to this list in order to
241 * continue accepting this flag on the command-line, while issuing a warning
242 * and ignoring the value. Once the JDK version reaches the 'accept_until'
243 * limit, we flatly refuse to admit the existence of the flag. This allows
244 * a flag to die correctly over JDK releases using HSX.
245 * But now that HSX is no longer supported only options with a future
246 * accept_until value need to be listed, and the list can be pruned
247 * on each major release.
248 */
249 typedef struct {
250 const char* name;
251 JDK_Version obsoleted_in; // when the flag went away
252 JDK_Version accept_until; // which version to start denying the existence
253 } ObsoleteFlag;
254
255 static ObsoleteFlag obsolete_jvm_flags[] = {
256 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
257 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
258 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
259 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
260 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
261 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
262 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
263 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
264 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
265 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
266 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
267 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
268 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
269 #ifndef ZERO
270 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
271 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
272 #endif // ZERO
273 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) },
274 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) },
275 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) },
276 { "ThreadSafetyMargin", JDK_Version::jdk(9), JDK_Version::jdk(10) },
277 { NULL, JDK_Version(0), JDK_Version(0) }
278 };
279
280 // Returns true if the flag is obsolete and fits into the range specified
281 // for being ignored. In the case that the flag is ignored, the 'version'
282 // value is filled in with the version number when the flag became
283 // obsolete so that that value can be displayed to the user.
284 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
285 int i = 0;
286 assert(version != NULL, "Must provide a version buffer");
287 while (obsolete_jvm_flags[i].name != NULL) {
288 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
289 // <flag>=xxx form
290 // [-|+]<flag> form
291 size_t len = strlen(flag_status.name);
292 if ((strncmp(flag_status.name, s, len) == 0) &&
293 (strlen(s) == len)){
294 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
295 *version = flag_status.obsoleted_in;
296 return true;
297 }
298 }
299 i++;
300 }
301 return false;
302 }
303
304 // Constructs the system class path (aka boot class path) from the following
305 // components, in order:
306 //
307 // prefix // from -Xbootclasspath/p:...
308 // base // from os::get_system_properties() or -Xbootclasspath=
309 // suffix // from -Xbootclasspath/a:...
310 //
311 // This could be AllStatic, but it isn't needed after argument processing is
312 // complete.
313 class SysClassPath: public StackObj {
314 public:
315 SysClassPath(const char* base);
316 ~SysClassPath();
317
318 inline void set_base(const char* base);
319 inline void add_prefix(const char* prefix);
320 inline void add_suffix_to_prefix(const char* suffix);
321 inline void add_suffix(const char* suffix);
322 inline void reset_path(const char* base);
323
324 inline const char* get_base() const { return _items[_scp_base]; }
325 inline const char* get_prefix() const { return _items[_scp_prefix]; }
326 inline const char* get_suffix() const { return _items[_scp_suffix]; }
327
328 // Combine all the components into a single c-heap-allocated string; caller
329 // must free the string if/when no longer needed.
330 char* combined_path();
331
332 private:
333 // Utility routines.
334 static char* add_to_path(const char* path, const char* str, bool prepend);
335 static char* add_jars_to_path(char* path, const char* directory);
336
337 inline void reset_item_at(int index);
338
339 // Array indices for the items that make up the sysclasspath. All except the
340 // base are allocated in the C heap and freed by this class.
341 enum {
342 _scp_prefix, // from -Xbootclasspath/p:...
343 _scp_base, // the default sysclasspath
344 _scp_suffix, // from -Xbootclasspath/a:...
345 _scp_nitems // the number of items, must be last.
346 };
347
348 const char* _items[_scp_nitems];
349 };
350
351 SysClassPath::SysClassPath(const char* base) {
352 memset(_items, 0, sizeof(_items));
353 _items[_scp_base] = base;
354 }
355
356 SysClassPath::~SysClassPath() {
357 // Free everything except the base.
358 for (int i = 0; i < _scp_nitems; ++i) {
359 if (i != _scp_base) reset_item_at(i);
360 }
361 }
362
363 inline void SysClassPath::set_base(const char* base) {
364 _items[_scp_base] = base;
365 }
366
367 inline void SysClassPath::add_prefix(const char* prefix) {
368 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
369 }
370
371 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
372 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
373 }
374
375 inline void SysClassPath::add_suffix(const char* suffix) {
376 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
377 }
378
379 inline void SysClassPath::reset_item_at(int index) {
380 assert(index < _scp_nitems && index != _scp_base, "just checking");
381 if (_items[index] != NULL) {
382 FREE_C_HEAP_ARRAY(char, _items[index]);
383 _items[index] = NULL;
384 }
385 }
386
387 inline void SysClassPath::reset_path(const char* base) {
388 // Clear the prefix and suffix.
389 reset_item_at(_scp_prefix);
390 reset_item_at(_scp_suffix);
391 set_base(base);
392 }
393
394 //------------------------------------------------------------------------------
395
396
397 // Combine the bootclasspath elements, some of which may be null, into a single
398 // c-heap-allocated string.
399 char* SysClassPath::combined_path() {
400 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
401
402 size_t lengths[_scp_nitems];
403 size_t total_len = 0;
404
405 const char separator = *os::path_separator();
406
407 // Get the lengths.
408 int i;
409 for (i = 0; i < _scp_nitems; ++i) {
410 if (_items[i] != NULL) {
411 lengths[i] = strlen(_items[i]);
412 // Include space for the separator char (or a NULL for the last item).
413 total_len += lengths[i] + 1;
414 }
415 }
416 assert(total_len > 0, "empty sysclasspath not allowed");
417
418 // Copy the _items to a single string.
419 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
420 char* cp_tmp = cp;
421 for (i = 0; i < _scp_nitems; ++i) {
422 if (_items[i] != NULL) {
423 memcpy(cp_tmp, _items[i], lengths[i]);
424 cp_tmp += lengths[i];
425 *cp_tmp++ = separator;
426 }
427 }
428 *--cp_tmp = '\0'; // Replace the extra separator.
429 return cp;
430 }
431
432 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
433 char*
434 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
435 char *cp;
436
437 assert(str != NULL, "just checking");
438 if (path == NULL) {
439 size_t len = strlen(str) + 1;
440 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
441 memcpy(cp, str, len); // copy the trailing null
442 } else {
443 const char separator = *os::path_separator();
444 size_t old_len = strlen(path);
445 size_t str_len = strlen(str);
446 size_t len = old_len + str_len + 2;
447
448 if (prepend) {
449 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
450 char* cp_tmp = cp;
451 memcpy(cp_tmp, str, str_len);
452 cp_tmp += str_len;
453 *cp_tmp = separator;
454 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
455 FREE_C_HEAP_ARRAY(char, path);
456 } else {
457 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
458 char* cp_tmp = cp + old_len;
459 *cp_tmp = separator;
460 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
461 }
462 }
463 return cp;
464 }
465
466 // Scan the directory and append any jar or zip files found to path.
467 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
468 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
469 DIR* dir = os::opendir(directory);
470 if (dir == NULL) return path;
471
472 char dir_sep[2] = { '\0', '\0' };
473 size_t directory_len = strlen(directory);
474 const char fileSep = *os::file_separator();
475 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
476
477 /* Scan the directory for jars/zips, appending them to path. */
478 struct dirent *entry;
479 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
480 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
481 const char* name = entry->d_name;
482 const char* ext = name + strlen(name) - 4;
483 bool isJarOrZip = ext > name &&
484 (os::file_name_strcmp(ext, ".jar") == 0 ||
485 os::file_name_strcmp(ext, ".zip") == 0);
486 if (isJarOrZip) {
487 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
488 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
489 path = add_to_path(path, jarpath, false);
490 FREE_C_HEAP_ARRAY(char, jarpath);
491 }
492 }
493 FREE_C_HEAP_ARRAY(char, dbuf);
494 os::closedir(dir);
495 return path;
496 }
497
498 // Parses a memory size specification string.
499 static bool atomull(const char *s, julong* result) {
500 julong n = 0;
501 int args_read = 0;
502 bool is_hex = false;
503 // Skip leading 0[xX] for hexadecimal
504 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
505 s += 2;
506 is_hex = true;
507 args_read = sscanf(s, JULONG_FORMAT_X, &n);
508 } else {
509 args_read = sscanf(s, JULONG_FORMAT, &n);
510 }
511 if (args_read != 1) {
512 return false;
513 }
514 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
515 s++;
516 }
517 // 4705540: illegal if more characters are found after the first non-digit
518 if (strlen(s) > 1) {
519 return false;
520 }
521 switch (*s) {
522 case 'T': case 't':
523 *result = n * G * K;
524 // Check for overflow.
525 if (*result/((julong)G * K) != n) return false;
526 return true;
527 case 'G': case 'g':
528 *result = n * G;
529 if (*result/G != n) return false;
530 return true;
531 case 'M': case 'm':
532 *result = n * M;
533 if (*result/M != n) return false;
534 return true;
535 case 'K': case 'k':
536 *result = n * K;
537 if (*result/K != n) return false;
538 return true;
539 case '\0':
540 *result = n;
541 return true;
542 default:
543 return false;
544 }
545 }
546
547 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
548 if (size < min_size) return arg_too_small;
549 // Check that size will fit in a size_t (only relevant on 32-bit)
550 if (size > max_uintx) return arg_too_big;
551 return arg_in_range;
552 }
553
554 // Describe an argument out of range error
555 void Arguments::describe_range_error(ArgsRange errcode) {
556 switch(errcode) {
557 case arg_too_big:
558 jio_fprintf(defaultStream::error_stream(),
559 "The specified size exceeds the maximum "
560 "representable size.\n");
561 break;
562 case arg_too_small:
563 case arg_unreadable:
564 case arg_in_range:
565 // do nothing for now
566 break;
567 default:
568 ShouldNotReachHere();
569 }
570 }
571
572 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
573 return CommandLineFlags::boolAtPut(name, &value, origin);
574 }
575
576 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
577 double v;
578 if (sscanf(value, "%lf", &v) != 1) {
579 return false;
580 }
581
582 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
583 return true;
584 }
585 return false;
586 }
587
588 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
589 julong v;
590 int int_v;
591 intx intx_v;
592 bool is_neg = false;
593 // Check the sign first since atomull() parses only unsigned values.
594 if (*value == '-') {
595 if (!CommandLineFlags::intxAt(name, &intx_v) && !CommandLineFlags::intAt(name, &int_v)) {
596 return false;
597 }
598 value++;
599 is_neg = true;
600 }
601 if (!atomull(value, &v)) {
602 return false;
603 }
604 int_v = (int) v;
605 if (is_neg) {
606 int_v = -int_v;
607 }
608 if (CommandLineFlags::intAtPut(name, &int_v, origin)) {
609 return true;
610 }
611 uint uint_v = (uint) v;
612 if (!is_neg && CommandLineFlags::uintAtPut(name, &uint_v, origin)) {
613 return true;
614 }
615 intx_v = (intx) v;
616 if (is_neg) {
617 intx_v = -intx_v;
618 }
619 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
620 return true;
621 }
622 uintx uintx_v = (uintx) v;
623 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
624 return true;
625 }
626 uint64_t uint64_t_v = (uint64_t) v;
627 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
628 return true;
629 }
630 size_t size_t_v = (size_t) v;
631 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
632 return true;
633 }
634 return false;
635 }
636
637 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
638 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
639 // Contract: CommandLineFlags always returns a pointer that needs freeing.
640 FREE_C_HEAP_ARRAY(char, value);
641 return true;
642 }
643
644 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
645 const char* old_value = "";
646 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
647 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
648 size_t new_len = strlen(new_value);
649 const char* value;
650 char* free_this_too = NULL;
651 if (old_len == 0) {
652 value = new_value;
653 } else if (new_len == 0) {
654 value = old_value;
655 } else {
656 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
657 // each new setting adds another LINE to the switch:
658 sprintf(buf, "%s\n%s", old_value, new_value);
659 value = buf;
660 free_this_too = buf;
661 }
662 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
663 // CommandLineFlags always returns a pointer that needs freeing.
664 FREE_C_HEAP_ARRAY(char, value);
665 if (free_this_too != NULL) {
666 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
667 FREE_C_HEAP_ARRAY(char, free_this_too);
668 }
669 return true;
670 }
671
672 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
673
674 // range of acceptable characters spelled out for portability reasons
675 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
676 #define BUFLEN 255
677 char name[BUFLEN+1];
678 char dummy;
679
680 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
681 return set_bool_flag(name, false, origin);
682 }
683 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
684 return set_bool_flag(name, true, origin);
685 }
686
687 char punct;
688 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
689 const char* value = strchr(arg, '=') + 1;
690 Flag* flag = Flag::find_flag(name, strlen(name));
691 if (flag != NULL && flag->is_ccstr()) {
692 if (flag->ccstr_accumulates()) {
693 return append_to_string_flag(name, value, origin);
694 } else {
695 if (value[0] == '\0') {
696 value = NULL;
697 }
698 return set_string_flag(name, value, origin);
699 }
700 }
701 }
702
703 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
704 const char* value = strchr(arg, '=') + 1;
705 // -XX:Foo:=xxx will reset the string flag to the given value.
706 if (value[0] == '\0') {
707 value = NULL;
708 }
709 return set_string_flag(name, value, origin);
710 }
711
712 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
713 #define SIGNED_NUMBER_RANGE "[-0123456789]"
714 #define NUMBER_RANGE "[0123456789]"
715 char value[BUFLEN + 1];
716 char value2[BUFLEN + 1];
717 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
718 // Looks like a floating-point number -- try again with more lenient format string
719 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
720 return set_fp_numeric_flag(name, value, origin);
721 }
722 }
723
724 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
725 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
726 return set_numeric_flag(name, value, origin);
727 }
728
729 return false;
730 }
731
732 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
733 assert(bldarray != NULL, "illegal argument");
734
735 if (arg == NULL) {
736 return;
737 }
738
739 int new_count = *count + 1;
740
741 // expand the array and add arg to the last element
742 if (*bldarray == NULL) {
743 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
744 } else {
745 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
746 }
747 (*bldarray)[*count] = os::strdup_check_oom(arg);
748 *count = new_count;
749 }
750
751 void Arguments::build_jvm_args(const char* arg) {
752 add_string(&_jvm_args_array, &_num_jvm_args, arg);
753 }
754
755 void Arguments::build_jvm_flags(const char* arg) {
756 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
757 }
758
759 // utility function to return a string that concatenates all
760 // strings in a given char** array
761 const char* Arguments::build_resource_string(char** args, int count) {
762 if (args == NULL || count == 0) {
763 return NULL;
764 }
765 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
766 for (int i = 1; i < count; i++) {
767 length += strlen(args[i]) + 1; // add 1 for a space
768 }
769 char* s = NEW_RESOURCE_ARRAY(char, length);
770 strcpy(s, args[0]);
771 for (int j = 1; j < count; j++) {
772 strcat(s, " ");
773 strcat(s, args[j]);
774 }
775 return (const char*) s;
776 }
777
778 void Arguments::print_on(outputStream* st) {
779 st->print_cr("VM Arguments:");
780 if (num_jvm_flags() > 0) {
781 st->print("jvm_flags: "); print_jvm_flags_on(st);
782 }
783 if (num_jvm_args() > 0) {
784 st->print("jvm_args: "); print_jvm_args_on(st);
785 }
786 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
787 if (_java_class_path != NULL) {
788 char* path = _java_class_path->value();
789 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
790 }
791 st->print_cr("Launcher Type: %s", _sun_java_launcher);
792 }
793
794 void Arguments::print_jvm_flags_on(outputStream* st) {
795 if (_num_jvm_flags > 0) {
796 for (int i=0; i < _num_jvm_flags; i++) {
797 st->print("%s ", _jvm_flags_array[i]);
798 }
799 st->cr();
800 }
801 }
802
803 void Arguments::print_jvm_args_on(outputStream* st) {
804 if (_num_jvm_args > 0) {
805 for (int i=0; i < _num_jvm_args; i++) {
806 st->print("%s ", _jvm_args_array[i]);
807 }
808 st->cr();
809 }
810 }
811
812 bool Arguments::process_argument(const char* arg,
813 jboolean ignore_unrecognized, Flag::Flags origin) {
814
815 JDK_Version since = JDK_Version();
816
817 if (parse_argument(arg, origin) || ignore_unrecognized) {
818 return true;
819 }
820
821 // Determine if the flag has '+', '-', or '=' characters.
822 bool has_plus_minus = (*arg == '+' || *arg == '-');
823 const char* const argname = has_plus_minus ? arg + 1 : arg;
824
825 size_t arg_len;
826 const char* equal_sign = strchr(argname, '=');
827 if (equal_sign == NULL) {
828 arg_len = strlen(argname);
829 } else {
830 arg_len = equal_sign - argname;
831 }
832
833 // Construct a string which consists only of the argument name without '+', '-', or '='.
834 char stripped_argname[256];
835 strncpy(stripped_argname, argname, arg_len);
836 stripped_argname[arg_len] = '\0'; //strncpy doesn't null terminate.
837
838 if (is_newly_obsolete(stripped_argname, &since)) {
839 char version[256];
840 since.to_string(version, sizeof(version));
841 warning("ignoring option %s; support was removed in %s", stripped_argname, version);
842 return true;
843 }
844
845 // For locked flags, report a custom error message if available.
846 // Otherwise, report the standard unrecognized VM option.
847 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
848 if (found_flag != NULL) {
849 char locked_message_buf[BUFLEN];
850 found_flag->get_locked_message(locked_message_buf, BUFLEN);
851 if (strlen(locked_message_buf) == 0) {
852 if (found_flag->is_bool() && !has_plus_minus) {
853 jio_fprintf(defaultStream::error_stream(),
854 "Missing +/- setting for VM option '%s'\n", argname);
855 } else if (!found_flag->is_bool() && has_plus_minus) {
856 jio_fprintf(defaultStream::error_stream(),
857 "Unexpected +/- setting in VM option '%s'\n", argname);
858 } else {
859 jio_fprintf(defaultStream::error_stream(),
860 "Improperly specified VM option '%s'\n", argname);
861 }
862 } else {
863 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
864 }
865 } else {
866 jio_fprintf(defaultStream::error_stream(),
867 "Unrecognized VM option '%s'\n", argname);
868 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
869 if (fuzzy_matched != NULL) {
870 jio_fprintf(defaultStream::error_stream(),
871 "Did you mean '%s%s%s'? ",
872 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
873 fuzzy_matched->_name,
874 (fuzzy_matched->is_bool()) ? "" : "=<value>");
875 }
876 }
877
878 // allow for commandline "commenting out" options like -XX:#+Verbose
879 return arg[0] == '#';
880 }
881
882 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
883 FILE* stream = fopen(file_name, "rb");
884 if (stream == NULL) {
885 if (should_exist) {
886 jio_fprintf(defaultStream::error_stream(),
887 "Could not open settings file %s\n", file_name);
888 return false;
889 } else {
890 return true;
891 }
892 }
893
894 char token[1024];
895 int pos = 0;
896
897 bool in_white_space = true;
898 bool in_comment = false;
899 bool in_quote = false;
900 char quote_c = 0;
901 bool result = true;
902
903 int c = getc(stream);
904 while(c != EOF && pos < (int)(sizeof(token)-1)) {
905 if (in_white_space) {
906 if (in_comment) {
907 if (c == '\n') in_comment = false;
908 } else {
909 if (c == '#') in_comment = true;
910 else if (!isspace(c)) {
911 in_white_space = false;
912 token[pos++] = c;
913 }
914 }
915 } else {
916 if (c == '\n' || (!in_quote && isspace(c))) {
917 // token ends at newline, or at unquoted whitespace
918 // this allows a way to include spaces in string-valued options
919 token[pos] = '\0';
920 logOption(token);
921 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
922 build_jvm_flags(token);
923 pos = 0;
924 in_white_space = true;
925 in_quote = false;
926 } else if (!in_quote && (c == '\'' || c == '"')) {
927 in_quote = true;
928 quote_c = c;
929 } else if (in_quote && (c == quote_c)) {
930 in_quote = false;
931 } else {
932 token[pos++] = c;
933 }
934 }
935 c = getc(stream);
936 }
937 if (pos > 0) {
938 token[pos] = '\0';
939 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
940 build_jvm_flags(token);
941 }
942 fclose(stream);
943 return result;
944 }
945
946 //=============================================================================================================
947 // Parsing of properties (-D)
948
949 const char* Arguments::get_property(const char* key) {
950 return PropertyList_get_value(system_properties(), key);
951 }
952
953 bool Arguments::add_property(const char* prop) {
954 const char* eq = strchr(prop, '=');
955 char* key;
956 // ns must be static--its address may be stored in a SystemProperty object.
957 const static char ns[1] = {0};
958 char* value = (char *)ns;
959
960 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
961 key = AllocateHeap(key_len + 1, mtInternal);
962 strncpy(key, prop, key_len);
963 key[key_len] = '\0';
964
965 if (eq != NULL) {
966 size_t value_len = strlen(prop) - key_len - 1;
967 value = AllocateHeap(value_len + 1, mtInternal);
968 strncpy(value, &prop[key_len + 1], value_len + 1);
969 }
970
971 if (strcmp(key, "java.compiler") == 0) {
972 process_java_compiler_argument(value);
973 FreeHeap(key);
974 if (eq != NULL) {
975 FreeHeap(value);
976 }
977 return true;
978 } else if (strcmp(key, "sun.java.command") == 0) {
979 _java_command = value;
980
981 // Record value in Arguments, but let it get passed to Java.
982 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
983 strcmp(key, "sun.java.launcher.pid") == 0) {
984 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
985 // private and are processed in process_sun_java_launcher_properties();
986 // the sun.java.launcher property is passed on to the java application
987 FreeHeap(key);
988 if (eq != NULL) {
989 FreeHeap(value);
990 }
991 return true;
992 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
993 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
994 // its value without going through the property list or making a Java call.
995 _java_vendor_url_bug = value;
996 } else if (strcmp(key, "sun.boot.library.path") == 0) {
997 PropertyList_unique_add(&_system_properties, key, value, true);
998 return true;
999 }
1000 // Create new property and add at the end of the list
1001 PropertyList_unique_add(&_system_properties, key, value);
1002 return true;
1003 }
1004
1005 //===========================================================================================================
1006 // Setting int/mixed/comp mode flags
1007
1008 void Arguments::set_mode_flags(Mode mode) {
1009 // Set up default values for all flags.
1010 // If you add a flag to any of the branches below,
1011 // add a default value for it here.
1012 set_java_compiler(false);
1013 _mode = mode;
1014
1015 // Ensure Agent_OnLoad has the correct initial values.
1016 // This may not be the final mode; mode may change later in onload phase.
1017 PropertyList_unique_add(&_system_properties, "java.vm.info",
1018 (char*)VM_Version::vm_info_string(), false);
1019
1020 UseInterpreter = true;
1021 UseCompiler = true;
1022 UseLoopCounter = true;
1023
1024 // Default values may be platform/compiler dependent -
1025 // use the saved values
1026 ClipInlining = Arguments::_ClipInlining;
1027 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1028 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1029 BackgroundCompilation = Arguments::_BackgroundCompilation;
1030 if (TieredCompilation) {
1031 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1032 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1033 }
1034 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1035 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1036 }
1037 }
1038
1039 // Change from defaults based on mode
1040 switch (mode) {
1041 default:
1042 ShouldNotReachHere();
1043 break;
1044 case _int:
1045 UseCompiler = false;
1046 UseLoopCounter = false;
1047 AlwaysCompileLoopMethods = false;
1048 UseOnStackReplacement = false;
1049 break;
1050 case _mixed:
1051 // same as default
1052 break;
1053 case _comp:
1054 UseInterpreter = false;
1055 BackgroundCompilation = false;
1056 ClipInlining = false;
1057 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1058 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1059 // compile a level 4 (C2) and then continue executing it.
1060 if (TieredCompilation) {
1061 Tier3InvokeNotifyFreqLog = 0;
1062 Tier4InvocationThreshold = 0;
1063 }
1064 break;
1065 }
1066 }
1067
1068 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1069 // Conflict: required to use shared spaces (-Xshare:on), but
1070 // incompatible command line options were chosen.
1071
1072 static void no_shared_spaces(const char* message) {
1073 if (RequireSharedSpaces) {
1074 jio_fprintf(defaultStream::error_stream(),
1075 "Class data sharing is inconsistent with other specified options.\n");
1076 vm_exit_during_initialization("Unable to use shared archive.", message);
1077 } else {
1078 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1079 }
1080 }
1081 #endif
1082
1083 // Returns threshold scaled with the value of scale.
1084 // If scale < 0.0, threshold is returned without scaling.
1085 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1086 if (scale == 1.0 || scale < 0.0) {
1087 return threshold;
1088 } else {
1089 return (intx)(threshold * scale);
1090 }
1091 }
1092
1093 // Returns freq_log scaled with the value of scale.
1094 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1095 // If scale < 0.0, freq_log is returned without scaling.
1096 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1097 // Check if scaling is necessary or if negative value was specified.
1098 if (scale == 1.0 || scale < 0.0) {
1099 return freq_log;
1100 }
1101 // Check values to avoid calculating log2 of 0.
1102 if (scale == 0.0 || freq_log == 0) {
1103 return 0;
1104 }
1105 // Determine the maximum notification frequency value currently supported.
1106 // The largest mask value that the interpreter/C1 can handle is
1107 // of length InvocationCounter::number_of_count_bits. Mask values are always
1108 // one bit shorter then the value of the notification frequency. Set
1109 // max_freq_bits accordingly.
1110 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1111 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1112 if (scaled_freq == 0) {
1113 // Return 0 right away to avoid calculating log2 of 0.
1114 return 0;
1115 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1116 return max_freq_bits;
1117 } else {
1118 return log2_intptr(scaled_freq);
1119 }
1120 }
1121
1122 void Arguments::set_tiered_flags() {
1123 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1124 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1125 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1126 }
1127 if (CompilationPolicyChoice < 2) {
1128 vm_exit_during_initialization(
1129 "Incompatible compilation policy selected", NULL);
1130 }
1131 // Increase the code cache size - tiered compiles a lot more.
1132 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1133 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1134 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1135 }
1136 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1137 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1138 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1139
1140 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1141 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1142 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1143 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1144 }
1145 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1146 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1147 }
1148 // Check consistency of code heap sizes
1149 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1150 jio_fprintf(defaultStream::error_stream(),
1151 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1152 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1153 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1154 vm_exit(1);
1155 }
1156 }
1157 }
1158 if (!UseInterpreter) { // -Xcomp
1159 Tier3InvokeNotifyFreqLog = 0;
1160 Tier4InvocationThreshold = 0;
1161 }
1162
1163 if (CompileThresholdScaling < 0) {
1164 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1165 }
1166
1167 // Scale tiered compilation thresholds.
1168 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1169 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1170 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1171 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1172
1173 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1174 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1175 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1176 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1177
1178 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1179 // once these thresholds become supported.
1180
1181 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1182 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1183
1184 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1185 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1186
1187 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1188
1189 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1190 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1191 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1192 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1193 }
1194 }
1195
1196 /**
1197 * Returns the minimum number of compiler threads needed to run the JVM. The following
1198 * configurations are possible.
1199 *
1200 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1201 * compiler threads is 0.
1202 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1203 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1204 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1205 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1206 * C1 can be used, so the minimum number of compiler threads is 1.
1207 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1208 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1209 * the minimum number of compiler threads is 2.
1210 */
1211 int Arguments::get_min_number_of_compiler_threads() {
1212 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1213 return 0; // case 1
1214 #else
1215 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1216 return 1; // case 2 or case 3
1217 }
1218 return 2; // case 4 (tiered)
1219 #endif
1220 }
1221
1222 #if INCLUDE_ALL_GCS
1223 static void disable_adaptive_size_policy(const char* collector_name) {
1224 if (UseAdaptiveSizePolicy) {
1225 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1226 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1227 collector_name);
1228 }
1229 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1230 }
1231 }
1232
1233 void Arguments::set_parnew_gc_flags() {
1234 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1235 "control point invariant");
1236 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1237 assert(UseParNewGC, "ParNew should always be used with CMS");
1238
1239 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1240 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1241 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1242 } else if (ParallelGCThreads == 0) {
1243 jio_fprintf(defaultStream::error_stream(),
1244 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1245 vm_exit(1);
1246 }
1247
1248 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1249 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1250 // we set them to 1024 and 1024.
1251 // See CR 6362902.
1252 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1253 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1254 }
1255 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1256 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1257 }
1258
1259 // When using compressed oops, we use local overflow stacks,
1260 // rather than using a global overflow list chained through
1261 // the klass word of the object's pre-image.
1262 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1263 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1264 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1265 }
1266 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1267 }
1268 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1269 }
1270
1271 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1272 // sparc/solaris for certain applications, but would gain from
1273 // further optimization and tuning efforts, and would almost
1274 // certainly gain from analysis of platform and environment.
1275 void Arguments::set_cms_and_parnew_gc_flags() {
1276 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1277 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1278 assert(UseParNewGC, "ParNew should always be used with CMS");
1279
1280 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1281 disable_adaptive_size_policy("UseConcMarkSweepGC");
1282
1283 set_parnew_gc_flags();
1284
1285 size_t max_heap = align_size_down(MaxHeapSize,
1286 CardTableRS::ct_max_alignment_constraint());
1287
1288 // Now make adjustments for CMS
1289 intx tenuring_default = (intx)6;
1290 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1291
1292 // Preferred young gen size for "short" pauses:
1293 // upper bound depends on # of threads and NewRatio.
1294 const size_t preferred_max_new_size_unaligned =
1295 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1296 size_t preferred_max_new_size =
1297 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1298
1299 // Unless explicitly requested otherwise, size young gen
1300 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1301
1302 // If either MaxNewSize or NewRatio is set on the command line,
1303 // assume the user is trying to set the size of the young gen.
1304 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1305
1306 // Set MaxNewSize to our calculated preferred_max_new_size unless
1307 // NewSize was set on the command line and it is larger than
1308 // preferred_max_new_size.
1309 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1310 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1311 } else {
1312 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1313 }
1314 if (PrintGCDetails && Verbose) {
1315 // Too early to use gclog_or_tty
1316 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1317 }
1318
1319 // Code along this path potentially sets NewSize and OldSize
1320 if (PrintGCDetails && Verbose) {
1321 // Too early to use gclog_or_tty
1322 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1323 " initial_heap_size: " SIZE_FORMAT
1324 " max_heap: " SIZE_FORMAT,
1325 min_heap_size(), InitialHeapSize, max_heap);
1326 }
1327 size_t min_new = preferred_max_new_size;
1328 if (FLAG_IS_CMDLINE(NewSize)) {
1329 min_new = NewSize;
1330 }
1331 if (max_heap > min_new && min_heap_size() > min_new) {
1332 // Unless explicitly requested otherwise, make young gen
1333 // at least min_new, and at most preferred_max_new_size.
1334 if (FLAG_IS_DEFAULT(NewSize)) {
1335 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1336 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1337 if (PrintGCDetails && Verbose) {
1338 // Too early to use gclog_or_tty
1339 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1340 }
1341 }
1342 // Unless explicitly requested otherwise, size old gen
1343 // so it's NewRatio x of NewSize.
1344 if (FLAG_IS_DEFAULT(OldSize)) {
1345 if (max_heap > NewSize) {
1346 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1347 if (PrintGCDetails && Verbose) {
1348 // Too early to use gclog_or_tty
1349 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1350 }
1351 }
1352 }
1353 }
1354 }
1355 // Unless explicitly requested otherwise, definitely
1356 // promote all objects surviving "tenuring_default" scavenges.
1357 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1358 FLAG_IS_DEFAULT(SurvivorRatio)) {
1359 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1360 }
1361 // If we decided above (or user explicitly requested)
1362 // `promote all' (via MaxTenuringThreshold := 0),
1363 // prefer minuscule survivor spaces so as not to waste
1364 // space for (non-existent) survivors
1365 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1366 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1367 }
1368
1369 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1370 // but rather the number of free blocks of a given size that are used when
1371 // replenishing the local per-worker free list caches.
1372 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1373 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1374 // OldPLAB sizing manually turned off: Use a larger default setting,
1375 // unless it was manually specified. This is because a too-low value
1376 // will slow down scavenges.
1377 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1378 } else {
1379 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1380 }
1381 }
1382
1383 // If either of the static initialization defaults have changed, note this
1384 // modification.
1385 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1386 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1387 }
1388 if (PrintGCDetails && Verbose) {
1389 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1390 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1391 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1392 }
1393 }
1394 #endif // INCLUDE_ALL_GCS
1395
1396 void set_object_alignment() {
1397 // Object alignment.
1398 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1399 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1400 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1401 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1402 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1403 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1404
1405 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1406 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1407
1408 // Oop encoding heap max
1409 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1410
1411 #if INCLUDE_ALL_GCS
1412 // Set CMS global values
1413 CompactibleFreeListSpace::set_cms_values();
1414 #endif // INCLUDE_ALL_GCS
1415 }
1416
1417 bool verify_object_alignment() {
1418 // Object alignment.
1419 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1420 jio_fprintf(defaultStream::error_stream(),
1421 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1422 (int)ObjectAlignmentInBytes);
1423 return false;
1424 }
1425 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1426 jio_fprintf(defaultStream::error_stream(),
1427 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1428 (int)ObjectAlignmentInBytes, BytesPerLong);
1429 return false;
1430 }
1431 // It does not make sense to have big object alignment
1432 // since a space lost due to alignment will be greater
1433 // then a saved space from compressed oops.
1434 if ((int)ObjectAlignmentInBytes > 256) {
1435 jio_fprintf(defaultStream::error_stream(),
1436 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1437 (int)ObjectAlignmentInBytes);
1438 return false;
1439 }
1440 // In case page size is very small.
1441 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1442 jio_fprintf(defaultStream::error_stream(),
1443 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1444 (int)ObjectAlignmentInBytes, os::vm_page_size());
1445 return false;
1446 }
1447 if(SurvivorAlignmentInBytes == 0) {
1448 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1449 } else {
1450 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1451 jio_fprintf(defaultStream::error_stream(),
1452 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1453 (int)SurvivorAlignmentInBytes);
1454 return false;
1455 }
1456 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1457 jio_fprintf(defaultStream::error_stream(),
1458 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1459 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1460 return false;
1461 }
1462 }
1463 return true;
1464 }
1465
1466 size_t Arguments::max_heap_for_compressed_oops() {
1467 // Avoid sign flip.
1468 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1469 // We need to fit both the NULL page and the heap into the memory budget, while
1470 // keeping alignment constraints of the heap. To guarantee the latter, as the
1471 // NULL page is located before the heap, we pad the NULL page to the conservative
1472 // maximum alignment that the GC may ever impose upon the heap.
1473 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1474 _conservative_max_heap_alignment);
1475
1476 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1477 NOT_LP64(ShouldNotReachHere(); return 0);
1478 }
1479
1480 bool Arguments::should_auto_select_low_pause_collector() {
1481 if (UseAutoGCSelectPolicy &&
1482 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1483 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1484 if (PrintGCDetails) {
1485 // Cannot use gclog_or_tty yet.
1486 tty->print_cr("Automatic selection of the low pause collector"
1487 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1488 }
1489 return true;
1490 }
1491 return false;
1492 }
1493
1494 void Arguments::set_use_compressed_oops() {
1495 #ifndef ZERO
1496 #ifdef _LP64
1497 // MaxHeapSize is not set up properly at this point, but
1498 // the only value that can override MaxHeapSize if we are
1499 // to use UseCompressedOops is InitialHeapSize.
1500 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1501
1502 if (max_heap_size <= max_heap_for_compressed_oops()) {
1503 #if !defined(COMPILER1) || defined(TIERED)
1504 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1505 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1506 }
1507 #endif
1508 } else {
1509 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1510 warning("Max heap size too large for Compressed Oops");
1511 FLAG_SET_DEFAULT(UseCompressedOops, false);
1512 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1513 }
1514 }
1515 #endif // _LP64
1516 #endif // ZERO
1517 }
1518
1519
1520 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1521 // set_use_compressed_oops().
1522 void Arguments::set_use_compressed_klass_ptrs() {
1523 #ifndef ZERO
1524 #ifdef _LP64
1525 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1526 if (!UseCompressedOops) {
1527 if (UseCompressedClassPointers) {
1528 warning("UseCompressedClassPointers requires UseCompressedOops");
1529 }
1530 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1531 } else {
1532 // Turn on UseCompressedClassPointers too
1533 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1534 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1535 }
1536 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1537 if (UseCompressedClassPointers) {
1538 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1539 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1540 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1541 }
1542 }
1543 }
1544 #endif // _LP64
1545 #endif // !ZERO
1546 }
1547
1548 void Arguments::set_conservative_max_heap_alignment() {
1549 // The conservative maximum required alignment for the heap is the maximum of
1550 // the alignments imposed by several sources: any requirements from the heap
1551 // itself, the collector policy and the maximum page size we may run the VM
1552 // with.
1553 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1554 #if INCLUDE_ALL_GCS
1555 if (UseParallelGC) {
1556 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1557 } else if (UseG1GC) {
1558 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1559 }
1560 #endif // INCLUDE_ALL_GCS
1561 _conservative_max_heap_alignment = MAX4(heap_alignment,
1562 (size_t)os::vm_allocation_granularity(),
1563 os::max_page_size(),
1564 CollectorPolicy::compute_heap_alignment());
1565 }
1566
1567 void Arguments::select_gc_ergonomically() {
1568 if (os::is_server_class_machine()) {
1569 if (should_auto_select_low_pause_collector()) {
1570 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1571 } else {
1572 FLAG_SET_ERGO(bool, UseParallelGC, true);
1573 }
1574 } else {
1575 FLAG_SET_ERGO(bool, UseSerialGC, true);
1576 }
1577 }
1578
1579 void Arguments::select_gc() {
1580 if (!gc_selected()) {
1581 select_gc_ergonomically();
1582 guarantee(gc_selected(), "No GC selected");
1583 }
1584 }
1585
1586 void Arguments::set_ergonomics_flags() {
1587 select_gc();
1588
1589 #ifdef COMPILER2
1590 // Shared spaces work fine with other GCs but causes bytecode rewriting
1591 // to be disabled, which hurts interpreter performance and decreases
1592 // server performance. When -server is specified, keep the default off
1593 // unless it is asked for. Future work: either add bytecode rewriting
1594 // at link time, or rewrite bytecodes in non-shared methods.
1595 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1596 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1597 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1598 }
1599 #endif
1600
1601 set_conservative_max_heap_alignment();
1602
1603 #ifndef ZERO
1604 #ifdef _LP64
1605 set_use_compressed_oops();
1606
1607 // set_use_compressed_klass_ptrs() must be called after calling
1608 // set_use_compressed_oops().
1609 set_use_compressed_klass_ptrs();
1610
1611 // Also checks that certain machines are slower with compressed oops
1612 // in vm_version initialization code.
1613 #endif // _LP64
1614 #endif // !ZERO
1615 }
1616
1617 void Arguments::set_parallel_gc_flags() {
1618 assert(UseParallelGC || UseParallelOldGC, "Error");
1619 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1620 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1621 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1622 }
1623 FLAG_SET_DEFAULT(UseParallelGC, true);
1624
1625 // If no heap maximum was requested explicitly, use some reasonable fraction
1626 // of the physical memory, up to a maximum of 1GB.
1627 FLAG_SET_DEFAULT(ParallelGCThreads,
1628 Abstract_VM_Version::parallel_worker_threads());
1629 if (ParallelGCThreads == 0) {
1630 jio_fprintf(defaultStream::error_stream(),
1631 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1632 vm_exit(1);
1633 }
1634
1635 if (UseAdaptiveSizePolicy) {
1636 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1637 // unless the user actually sets these flags.
1638 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1639 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1640 _min_heap_free_ratio = MinHeapFreeRatio;
1641 }
1642 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1643 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1644 _max_heap_free_ratio = MaxHeapFreeRatio;
1645 }
1646 }
1647
1648 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1649 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1650 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1651 // See CR 6362902 for details.
1652 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1653 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1654 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1655 }
1656 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1657 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1658 }
1659 }
1660
1661 if (UseParallelOldGC) {
1662 // Par compact uses lower default values since they are treated as
1663 // minimums. These are different defaults because of the different
1664 // interpretation and are not ergonomically set.
1665 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1666 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1667 }
1668 }
1669 }
1670
1671 void Arguments::set_g1_gc_flags() {
1672 assert(UseG1GC, "Error");
1673 #ifdef COMPILER1
1674 FastTLABRefill = false;
1675 #endif
1676 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1677 if (ParallelGCThreads == 0) {
1678 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1679 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1680 }
1681
1682 #if INCLUDE_ALL_GCS
1683 if (G1ConcRefinementThreads == 0) {
1684 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1685 }
1686 #endif
1687
1688 // MarkStackSize will be set (if it hasn't been set by the user)
1689 // when concurrent marking is initialized.
1690 // Its value will be based upon the number of parallel marking threads.
1691 // But we do set the maximum mark stack size here.
1692 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1693 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1694 }
1695
1696 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1697 // In G1, we want the default GC overhead goal to be higher than
1698 // say in PS. So we set it here to 10%. Otherwise the heap might
1699 // be expanded more aggressively than we would like it to. In
1700 // fact, even 10% seems to not be high enough in some cases
1701 // (especially small GC stress tests that the main thing they do
1702 // is allocation). We might consider increase it further.
1703 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1704 }
1705
1706 if (PrintGCDetails && Verbose) {
1707 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1708 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1709 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1710 }
1711 }
1712
1713 #if !INCLUDE_ALL_GCS
1714 #ifdef ASSERT
1715 static bool verify_serial_gc_flags() {
1716 return (UseSerialGC &&
1717 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1718 UseParallelGC || UseParallelOldGC));
1719 }
1720 #endif // ASSERT
1721 #endif // INCLUDE_ALL_GCS
1722
1723 void Arguments::set_gc_specific_flags() {
1724 #if INCLUDE_ALL_GCS
1725 // Set per-collector flags
1726 if (UseParallelGC || UseParallelOldGC) {
1727 set_parallel_gc_flags();
1728 } else if (UseConcMarkSweepGC) {
1729 set_cms_and_parnew_gc_flags();
1730 } else if (UseG1GC) {
1731 set_g1_gc_flags();
1732 }
1733 check_deprecated_gc_flags();
1734 if (AssumeMP && !UseSerialGC) {
1735 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1736 warning("If the number of processors is expected to increase from one, then"
1737 " you should configure the number of parallel GC threads appropriately"
1738 " using -XX:ParallelGCThreads=N");
1739 }
1740 }
1741 if (MinHeapFreeRatio == 100) {
1742 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1743 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1744 }
1745 #else // INCLUDE_ALL_GCS
1746 assert(verify_serial_gc_flags(), "SerialGC unset");
1747 #endif // INCLUDE_ALL_GCS
1748 }
1749
1750 julong Arguments::limit_by_allocatable_memory(julong limit) {
1751 julong max_allocatable;
1752 julong result = limit;
1753 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1754 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1755 }
1756 return result;
1757 }
1758
1759 // Use static initialization to get the default before parsing
1760 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1761
1762 void Arguments::set_heap_size() {
1763 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1764 // Deprecated flag
1765 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1766 }
1767
1768 const julong phys_mem =
1769 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1770 : (julong)MaxRAM;
1771
1772 // If the maximum heap size has not been set with -Xmx,
1773 // then set it as fraction of the size of physical memory,
1774 // respecting the maximum and minimum sizes of the heap.
1775 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1776 julong reasonable_max = phys_mem / MaxRAMFraction;
1777
1778 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1779 // Small physical memory, so use a minimum fraction of it for the heap
1780 reasonable_max = phys_mem / MinRAMFraction;
1781 } else {
1782 // Not-small physical memory, so require a heap at least
1783 // as large as MaxHeapSize
1784 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1785 }
1786 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1787 // Limit the heap size to ErgoHeapSizeLimit
1788 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1789 }
1790 if (UseCompressedOops) {
1791 // Limit the heap size to the maximum possible when using compressed oops
1792 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1793
1794 // HeapBaseMinAddress can be greater than default but not less than.
1795 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1796 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1797 // matches compressed oops printing flags
1798 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1799 jio_fprintf(defaultStream::error_stream(),
1800 "HeapBaseMinAddress must be at least " SIZE_FORMAT
1801 " (" SIZE_FORMAT "G) which is greater than value given "
1802 SIZE_FORMAT "\n",
1803 DefaultHeapBaseMinAddress,
1804 DefaultHeapBaseMinAddress/G,
1805 HeapBaseMinAddress);
1806 }
1807 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1808 }
1809 }
1810
1811 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1812 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1813 // but it should be not less than default MaxHeapSize.
1814 max_coop_heap -= HeapBaseMinAddress;
1815 }
1816 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1817 }
1818 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1819
1820 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1821 // An initial heap size was specified on the command line,
1822 // so be sure that the maximum size is consistent. Done
1823 // after call to limit_by_allocatable_memory because that
1824 // method might reduce the allocation size.
1825 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1826 }
1827
1828 if (PrintGCDetails && Verbose) {
1829 // Cannot use gclog_or_tty yet.
1830 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1831 }
1832 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1833 }
1834
1835 // If the minimum or initial heap_size have not been set or requested to be set
1836 // ergonomically, set them accordingly.
1837 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1838 julong reasonable_minimum = (julong)(OldSize + NewSize);
1839
1840 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1841
1842 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1843
1844 if (InitialHeapSize == 0) {
1845 julong reasonable_initial = phys_mem / InitialRAMFraction;
1846
1847 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1848 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1849
1850 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1851
1852 if (PrintGCDetails && Verbose) {
1853 // Cannot use gclog_or_tty yet.
1854 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1855 }
1856 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1857 }
1858 // If the minimum heap size has not been set (via -Xms),
1859 // synchronize with InitialHeapSize to avoid errors with the default value.
1860 if (min_heap_size() == 0) {
1861 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1862 if (PrintGCDetails && Verbose) {
1863 // Cannot use gclog_or_tty yet.
1864 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1865 }
1866 }
1867 }
1868 }
1869
1870 // This must be called after ergonomics.
1871 void Arguments::set_bytecode_flags() {
1872 if (!RewriteBytecodes) {
1873 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1874 }
1875 }
1876
1877 // Aggressive optimization flags -XX:+AggressiveOpts
1878 void Arguments::set_aggressive_opts_flags() {
1879 #ifdef COMPILER2
1880 if (AggressiveUnboxing) {
1881 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1882 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1883 } else if (!EliminateAutoBox) {
1884 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1885 AggressiveUnboxing = false;
1886 }
1887 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1888 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1889 } else if (!DoEscapeAnalysis) {
1890 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1891 AggressiveUnboxing = false;
1892 }
1893 }
1894 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1895 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1896 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1897 }
1898 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1899 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1900 }
1901
1902 // Feed the cache size setting into the JDK
1903 char buffer[1024];
1904 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1905 add_property(buffer);
1906 }
1907 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1908 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1909 }
1910 #endif
1911
1912 if (AggressiveOpts) {
1913 // Sample flag setting code
1914 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1915 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1916 // }
1917 }
1918 }
1919
1920 //===========================================================================================================
1921 // Parsing of java.compiler property
1922
1923 void Arguments::process_java_compiler_argument(char* arg) {
1924 // For backwards compatibility, Djava.compiler=NONE or ""
1925 // causes us to switch to -Xint mode UNLESS -Xdebug
1926 // is also specified.
1927 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1928 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1929 }
1930 }
1931
1932 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1933 _sun_java_launcher = os::strdup_check_oom(launcher);
1934 }
1935
1936 bool Arguments::created_by_java_launcher() {
1937 assert(_sun_java_launcher != NULL, "property must have value");
1938 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1939 }
1940
1941 bool Arguments::sun_java_launcher_is_altjvm() {
1942 return _sun_java_launcher_is_altjvm;
1943 }
1944
1945 //===========================================================================================================
1946 // Parsing of main arguments
1947
1948 bool Arguments::verify_interval(uintx val, uintx min,
1949 uintx max, const char* name) {
1950 // Returns true iff value is in the inclusive interval [min..max]
1951 // false, otherwise.
1952 if (val >= min && val <= max) {
1953 return true;
1954 }
1955 jio_fprintf(defaultStream::error_stream(),
1956 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1957 " and " UINTX_FORMAT "\n",
1958 name, val, min, max);
1959 return false;
1960 }
1961
1962 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1963 // Returns true if given value is at least specified min threshold
1964 // false, otherwise.
1965 if (val >= min ) {
1966 return true;
1967 }
1968 jio_fprintf(defaultStream::error_stream(),
1969 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1970 name, val, min);
1971 return false;
1972 }
1973
1974 bool Arguments::verify_percentage(uintx value, const char* name) {
1975 if (is_percentage(value)) {
1976 return true;
1977 }
1978 jio_fprintf(defaultStream::error_stream(),
1979 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1980 name, value);
1981 return false;
1982 }
1983
1984 // check if do gclog rotation
1985 // +UseGCLogFileRotation is a must,
1986 // no gc log rotation when log file not supplied or
1987 // NumberOfGCLogFiles is 0
1988 void check_gclog_consistency() {
1989 if (UseGCLogFileRotation) {
1990 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1991 jio_fprintf(defaultStream::output_stream(),
1992 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1993 "where num_of_file > 0\n"
1994 "GC log rotation is turned off\n");
1995 UseGCLogFileRotation = false;
1996 }
1997 }
1998
1999 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2000 FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K);
2001 jio_fprintf(defaultStream::output_stream(),
2002 "GCLogFileSize changed to minimum 8K\n");
2003 }
2004 }
2005
2006 // This function is called for -Xloggc:<filename>, it can be used
2007 // to check if a given file name(or string) conforms to the following
2008 // specification:
2009 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2010 // %p and %t only allowed once. We only limit usage of filename not path
2011 bool is_filename_valid(const char *file_name) {
2012 const char* p = file_name;
2013 char file_sep = os::file_separator()[0];
2014 const char* cp;
2015 // skip prefix path
2016 for (cp = file_name; *cp != '\0'; cp++) {
2017 if (*cp == '/' || *cp == file_sep) {
2018 p = cp + 1;
2019 }
2020 }
2021
2022 int count_p = 0;
2023 int count_t = 0;
2024 while (*p != '\0') {
2025 if ((*p >= '0' && *p <= '9') ||
2026 (*p >= 'A' && *p <= 'Z') ||
2027 (*p >= 'a' && *p <= 'z') ||
2028 *p == '-' ||
2029 *p == '_' ||
2030 *p == '.') {
2031 p++;
2032 continue;
2033 }
2034 if (*p == '%') {
2035 if(*(p + 1) == 'p') {
2036 p += 2;
2037 count_p ++;
2038 continue;
2039 }
2040 if (*(p + 1) == 't') {
2041 p += 2;
2042 count_t ++;
2043 continue;
2044 }
2045 }
2046 return false;
2047 }
2048 return count_p < 2 && count_t < 2;
2049 }
2050
2051 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2052 if (!is_percentage(min_heap_free_ratio)) {
2053 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2054 return false;
2055 }
2056 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2057 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2058 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2059 MaxHeapFreeRatio);
2060 return false;
2061 }
2062 // This does not set the flag itself, but stores the value in a safe place for later usage.
2063 _min_heap_free_ratio = min_heap_free_ratio;
2064 return true;
2065 }
2066
2067 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2068 if (!is_percentage(max_heap_free_ratio)) {
2069 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2070 return false;
2071 }
2072 if (max_heap_free_ratio < MinHeapFreeRatio) {
2073 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2074 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2075 MinHeapFreeRatio);
2076 return false;
2077 }
2078 // This does not set the flag itself, but stores the value in a safe place for later usage.
2079 _max_heap_free_ratio = max_heap_free_ratio;
2080 return true;
2081 }
2082
2083 // Check consistency of GC selection
2084 bool Arguments::check_gc_consistency() {
2085 check_gclog_consistency();
2086 // Ensure that the user has not selected conflicting sets
2087 // of collectors.
2088 uint i = 0;
2089 if (UseSerialGC) i++;
2090 if (UseConcMarkSweepGC) i++;
2091 if (UseParallelGC || UseParallelOldGC) i++;
2092 if (UseG1GC) i++;
2093 if (i > 1) {
2094 jio_fprintf(defaultStream::error_stream(),
2095 "Conflicting collector combinations in option list; "
2096 "please refer to the release notes for the combinations "
2097 "allowed\n");
2098 return false;
2099 }
2100
2101 if (UseConcMarkSweepGC && !UseParNewGC) {
2102 jio_fprintf(defaultStream::error_stream(),
2103 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2104 return false;
2105 }
2106
2107 if (UseParNewGC && !UseConcMarkSweepGC) {
2108 jio_fprintf(defaultStream::error_stream(),
2109 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2110 return false;
2111 }
2112
2113 return true;
2114 }
2115
2116 void Arguments::check_deprecated_gc_flags() {
2117 if (FLAG_IS_CMDLINE(UseParNewGC)) {
2118 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2119 }
2120 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2121 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2122 "and will likely be removed in future release");
2123 }
2124 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2125 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2126 "Use MaxRAMFraction instead.");
2127 }
2128 }
2129
2130 // Check stack pages settings
2131 bool Arguments::check_stack_pages()
2132 {
2133 bool status = true;
2134 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2135 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2136 // greater stack shadow pages can't generate instruction to bang stack
2137 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2138 return status;
2139 }
2140
2141 // Check the consistency of vm_init_args
2142 bool Arguments::check_vm_args_consistency() {
2143 // Method for adding checks for flag consistency.
2144 // The intent is to warn the user of all possible conflicts,
2145 // before returning an error.
2146 // Note: Needs platform-dependent factoring.
2147 bool status = true;
2148
2149 if (TLABRefillWasteFraction == 0) {
2150 jio_fprintf(defaultStream::error_stream(),
2151 "TLABRefillWasteFraction should be a denominator, "
2152 "not " SIZE_FORMAT "\n",
2153 TLABRefillWasteFraction);
2154 status = false;
2155 }
2156
2157 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2158 "AdaptiveSizePolicyWeight");
2159 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2160
2161 // Divide by bucket size to prevent a large size from causing rollover when
2162 // calculating amount of memory needed to be allocated for the String table.
2163 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2164 (max_uintx / StringTable::bucket_size()), "StringTable size");
2165
2166 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2167 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2168
2169 {
2170 // Using "else if" below to avoid printing two error messages if min > max.
2171 // This will also prevent us from reporting both min>100 and max>100 at the
2172 // same time, but that is less annoying than printing two identical errors IMHO.
2173 FormatBuffer<80> err_msg("%s","");
2174 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2175 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2176 status = false;
2177 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2178 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2179 status = false;
2180 }
2181 }
2182
2183 // Min/MaxMetaspaceFreeRatio
2184 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2185 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2186
2187 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2188 jio_fprintf(defaultStream::error_stream(),
2189 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2190 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2191 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2192 MinMetaspaceFreeRatio,
2193 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2194 MaxMetaspaceFreeRatio);
2195 status = false;
2196 }
2197
2198 // Trying to keep 100% free is not practical
2199 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2200
2201 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2202 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2203 }
2204
2205 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2206 // Settings to encourage splitting.
2207 if (!FLAG_IS_CMDLINE(NewRatio)) {
2208 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2209 }
2210 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2211 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2212 }
2213 }
2214
2215 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2216 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2217 }
2218
2219 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2220 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2221 if (GCTimeLimit == 100) {
2222 // Turn off gc-overhead-limit-exceeded checks
2223 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2224 }
2225
2226 status = status && check_gc_consistency();
2227 status = status && check_stack_pages();
2228
2229 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2230 "CMSIncrementalSafetyFactor");
2231
2232 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2233 // insists that we hold the requisite locks so that the iteration is
2234 // MT-safe. For the verification at start-up and shut-down, we don't
2235 // yet have a good way of acquiring and releasing these locks,
2236 // which are not visible at the CollectedHeap level. We want to
2237 // be able to acquire these locks and then do the iteration rather
2238 // than just disable the lock verification. This will be fixed under
2239 // bug 4788986.
2240 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2241 if (VerifyDuringStartup) {
2242 warning("Heap verification at start-up disabled "
2243 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2244 VerifyDuringStartup = false; // Disable verification at start-up
2245 }
2246
2247 if (VerifyBeforeExit) {
2248 warning("Heap verification at shutdown disabled "
2249 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2250 VerifyBeforeExit = false; // Disable verification at shutdown
2251 }
2252 }
2253
2254 // Note: only executed in non-PRODUCT mode
2255 if (!UseAsyncConcMarkSweepGC &&
2256 (ExplicitGCInvokesConcurrent ||
2257 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2258 jio_fprintf(defaultStream::error_stream(),
2259 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2260 " with -UseAsyncConcMarkSweepGC");
2261 status = false;
2262 }
2263
2264 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2265
2266 #if INCLUDE_ALL_GCS
2267 if (UseG1GC) {
2268 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2269 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2270 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2271
2272 status = status && verify_percentage(G1ConfidencePercent, "G1ConfidencePercent");
2273 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2274 "InitiatingHeapOccupancyPercent");
2275 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2276 "G1RefProcDrainInterval");
2277 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2278 "G1ConcMarkStepDurationMillis");
2279 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2280 "G1ConcRSHotCardLimit");
2281 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2282 "G1ConcRSLogCacheSize");
2283 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2284 "StringDeduplicationAgeThreshold");
2285 }
2286 if (UseConcMarkSweepGC) {
2287 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2288 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2289 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2290 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2291
2292 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2293
2294 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2295 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2296 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2297
2298 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2299
2300 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2301 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2302
2303 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2304 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2305 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2306
2307 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2308
2309 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2310
2311 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2312 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2313 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2314 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2315 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2316 }
2317
2318 if (UseParallelGC || UseParallelOldGC) {
2319 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2320 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2321
2322 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2323 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2324
2325 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2326 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2327
2328 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2329
2330 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2331 }
2332 #endif // INCLUDE_ALL_GCS
2333
2334 status = status && verify_interval(RefDiscoveryPolicy,
2335 ReferenceProcessor::DiscoveryPolicyMin,
2336 ReferenceProcessor::DiscoveryPolicyMax,
2337 "RefDiscoveryPolicy");
2338
2339 // Limit the lower bound of this flag to 1 as it is used in a division
2340 // expression.
2341 status = status && verify_interval(TLABWasteTargetPercent,
2342 1, 100, "TLABWasteTargetPercent");
2343
2344 status = status && verify_object_alignment();
2345
2346 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2347 "CompressedClassSpaceSize");
2348
2349 status = status && verify_interval(MarkStackSizeMax,
2350 1, (max_jint - 1), "MarkStackSizeMax");
2351 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2352
2353 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2354
2355 status = status && verify_min_value(HeapSizePerGCThread, (size_t) os::vm_page_size(), "HeapSizePerGCThread");
2356
2357 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2358
2359 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2360 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2361
2362 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2363
2364 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2365 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2366 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2367 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2368
2369 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2370 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2371
2372 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2373 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2374 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2375
2376 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2377 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2378
2379 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2380 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2381 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2382 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2383
2384 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2385 #ifdef COMPILER1
2386 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2387 #endif
2388 status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps");
2389
2390 if (PrintNMTStatistics) {
2391 #if INCLUDE_NMT
2392 if (MemTracker::tracking_level() == NMT_off) {
2393 #endif // INCLUDE_NMT
2394 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2395 PrintNMTStatistics = false;
2396 #if INCLUDE_NMT
2397 }
2398 #endif
2399 }
2400
2401 // Need to limit the extent of the padding to reasonable size.
2402 // 8K is well beyond the reasonable HW cache line size, even with the
2403 // aggressive prefetching, while still leaving the room for segregating
2404 // among the distinct pages.
2405 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2406 jio_fprintf(defaultStream::error_stream(),
2407 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2408 ContendedPaddingWidth, 0, 8192);
2409 status = false;
2410 }
2411
2412 // Need to enforce the padding not to break the existing field alignments.
2413 // It is sufficient to check against the largest type size.
2414 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2415 jio_fprintf(defaultStream::error_stream(),
2416 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2417 ContendedPaddingWidth, BytesPerLong);
2418 status = false;
2419 }
2420
2421 // Check lower bounds of the code cache
2422 // Template Interpreter code is approximately 3X larger in debug builds.
2423 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2424 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2425 jio_fprintf(defaultStream::error_stream(),
2426 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2427 os::vm_page_size()/K);
2428 status = false;
2429 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2430 jio_fprintf(defaultStream::error_stream(),
2431 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2432 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2433 status = false;
2434 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2435 jio_fprintf(defaultStream::error_stream(),
2436 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2437 min_code_cache_size/K);
2438 status = false;
2439 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2440 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2441 jio_fprintf(defaultStream::error_stream(),
2442 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2443 CODE_CACHE_SIZE_LIMIT/M);
2444 status = false;
2445 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2446 jio_fprintf(defaultStream::error_stream(),
2447 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2448 min_code_cache_size/K);
2449 status = false;
2450 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2451 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2452 jio_fprintf(defaultStream::error_stream(),
2453 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2454 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2455 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2456 status = false;
2457 }
2458
2459 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2460 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2461 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2462 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2463
2464
2465 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2466 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2467 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2468 // Check the minimum number of compiler threads
2469 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2470
2471 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2472 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2473 }
2474
2475 return status;
2476 }
2477
2478 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2479 const char* option_type) {
2480 if (ignore) return false;
2481
2482 const char* spacer = " ";
2483 if (option_type == NULL) {
2484 option_type = ++spacer; // Set both to the empty string.
2485 }
2486
2487 if (os::obsolete_option(option)) {
2488 jio_fprintf(defaultStream::error_stream(),
2489 "Obsolete %s%soption: %s\n", option_type, spacer,
2490 option->optionString);
2491 return false;
2492 } else {
2493 jio_fprintf(defaultStream::error_stream(),
2494 "Unrecognized %s%soption: %s\n", option_type, spacer,
2495 option->optionString);
2496 return true;
2497 }
2498 }
2499
2500 static const char* user_assertion_options[] = {
2501 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2502 };
2503
2504 static const char* system_assertion_options[] = {
2505 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2506 };
2507
2508 bool Arguments::parse_uintx(const char* value,
2509 uintx* uintx_arg,
2510 uintx min_size) {
2511
2512 // Check the sign first since atomull() parses only unsigned values.
2513 bool value_is_positive = !(*value == '-');
2514
2515 if (value_is_positive) {
2516 julong n;
2517 bool good_return = atomull(value, &n);
2518 if (good_return) {
2519 bool above_minimum = n >= min_size;
2520 bool value_is_too_large = n > max_uintx;
2521
2522 if (above_minimum && !value_is_too_large) {
2523 *uintx_arg = n;
2524 return true;
2525 }
2526 }
2527 }
2528 return false;
2529 }
2530
2531 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2532 julong* long_arg,
2533 julong min_size) {
2534 if (!atomull(s, long_arg)) return arg_unreadable;
2535 return check_memory_size(*long_arg, min_size);
2536 }
2537
2538 // Parse JavaVMInitArgs structure
2539
2540 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2541 // For components of the system classpath.
2542 SysClassPath scp(Arguments::get_sysclasspath());
2543 bool scp_assembly_required = false;
2544
2545 // Save default settings for some mode flags
2546 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2547 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2548 Arguments::_ClipInlining = ClipInlining;
2549 Arguments::_BackgroundCompilation = BackgroundCompilation;
2550 if (TieredCompilation) {
2551 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2552 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2553 }
2554
2555 // Setup flags for mixed which is the default
2556 set_mode_flags(_mixed);
2557
2558 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2559 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2560 if (result != JNI_OK) {
2561 return result;
2562 }
2563
2564 // Parse JavaVMInitArgs structure passed in
2565 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2566 if (result != JNI_OK) {
2567 return result;
2568 }
2569
2570 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2571 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2572 if (result != JNI_OK) {
2573 return result;
2574 }
2575
2576 // Do final processing now that all arguments have been parsed
2577 result = finalize_vm_init_args(&scp, scp_assembly_required);
2578 if (result != JNI_OK) {
2579 return result;
2580 }
2581
2582 return JNI_OK;
2583 }
2584
2585 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2586 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2587 // are dealing with -agentpath (case where name is a path), otherwise with
2588 // -agentlib
2589 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2590 char *_name;
2591 const char *_hprof = "hprof", *_jdwp = "jdwp";
2592 size_t _len_hprof, _len_jdwp, _len_prefix;
2593
2594 if (is_path) {
2595 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2596 return false;
2597 }
2598
2599 _name++; // skip past last path separator
2600 _len_prefix = strlen(JNI_LIB_PREFIX);
2601
2602 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2603 return false;
2604 }
2605
2606 _name += _len_prefix;
2607 _len_hprof = strlen(_hprof);
2608 _len_jdwp = strlen(_jdwp);
2609
2610 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2611 _name += _len_hprof;
2612 }
2613 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2614 _name += _len_jdwp;
2615 }
2616 else {
2617 return false;
2618 }
2619
2620 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2621 return false;
2622 }
2623
2624 return true;
2625 }
2626
2627 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2628 return true;
2629 }
2630
2631 return false;
2632 }
2633
2634 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2635 SysClassPath* scp_p,
2636 bool* scp_assembly_required_p,
2637 Flag::Flags origin) {
2638 // Remaining part of option string
2639 const char* tail;
2640
2641 // iterate over arguments
2642 for (int index = 0; index < args->nOptions; index++) {
2643 bool is_absolute_path = false; // for -agentpath vs -agentlib
2644
2645 const JavaVMOption* option = args->options + index;
2646
2647 if (!match_option(option, "-Djava.class.path", &tail) &&
2648 !match_option(option, "-Dsun.java.command", &tail) &&
2649 !match_option(option, "-Dsun.java.launcher", &tail)) {
2650
2651 // add all jvm options to the jvm_args string. This string
2652 // is used later to set the java.vm.args PerfData string constant.
2653 // the -Djava.class.path and the -Dsun.java.command options are
2654 // omitted from jvm_args string as each have their own PerfData
2655 // string constant object.
2656 build_jvm_args(option->optionString);
2657 }
2658
2659 // -verbose:[class/gc/jni]
2660 if (match_option(option, "-verbose", &tail)) {
2661 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2662 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2663 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2664 } else if (!strcmp(tail, ":gc")) {
2665 FLAG_SET_CMDLINE(bool, PrintGC, true);
2666 } else if (!strcmp(tail, ":jni")) {
2667 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2668 }
2669 // -da / -ea / -disableassertions / -enableassertions
2670 // These accept an optional class/package name separated by a colon, e.g.,
2671 // -da:java.lang.Thread.
2672 } else if (match_option(option, user_assertion_options, &tail, true)) {
2673 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2674 if (*tail == '\0') {
2675 JavaAssertions::setUserClassDefault(enable);
2676 } else {
2677 assert(*tail == ':', "bogus match by match_option()");
2678 JavaAssertions::addOption(tail + 1, enable);
2679 }
2680 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2681 } else if (match_option(option, system_assertion_options, &tail, false)) {
2682 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2683 JavaAssertions::setSystemClassDefault(enable);
2684 // -bootclasspath:
2685 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2686 scp_p->reset_path(tail);
2687 *scp_assembly_required_p = true;
2688 // -bootclasspath/a:
2689 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2690 scp_p->add_suffix(tail);
2691 *scp_assembly_required_p = true;
2692 // -bootclasspath/p:
2693 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2694 scp_p->add_prefix(tail);
2695 *scp_assembly_required_p = true;
2696 // -Xrun
2697 } else if (match_option(option, "-Xrun", &tail)) {
2698 if (tail != NULL) {
2699 const char* pos = strchr(tail, ':');
2700 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2701 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2702 name[len] = '\0';
2703
2704 char *options = NULL;
2705 if(pos != NULL) {
2706 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2707 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2708 }
2709 #if !INCLUDE_JVMTI
2710 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2711 jio_fprintf(defaultStream::error_stream(),
2712 "Profiling and debugging agents are not supported in this VM\n");
2713 return JNI_ERR;
2714 }
2715 #endif // !INCLUDE_JVMTI
2716 add_init_library(name, options);
2717 }
2718 // -agentlib and -agentpath
2719 } else if (match_option(option, "-agentlib:", &tail) ||
2720 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2721 if(tail != NULL) {
2722 const char* pos = strchr(tail, '=');
2723 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2724 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2725 name[len] = '\0';
2726
2727 char *options = NULL;
2728 if(pos != NULL) {
2729 options = os::strdup_check_oom(pos + 1, mtInternal);
2730 }
2731 #if !INCLUDE_JVMTI
2732 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2733 jio_fprintf(defaultStream::error_stream(),
2734 "Profiling and debugging agents are not supported in this VM\n");
2735 return JNI_ERR;
2736 }
2737 #endif // !INCLUDE_JVMTI
2738 add_init_agent(name, options, is_absolute_path);
2739 }
2740 // -javaagent
2741 } else if (match_option(option, "-javaagent:", &tail)) {
2742 #if !INCLUDE_JVMTI
2743 jio_fprintf(defaultStream::error_stream(),
2744 "Instrumentation agents are not supported in this VM\n");
2745 return JNI_ERR;
2746 #else
2747 if(tail != NULL) {
2748 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2749 add_init_agent("instrument", options, false);
2750 }
2751 #endif // !INCLUDE_JVMTI
2752 // -Xnoclassgc
2753 } else if (match_option(option, "-Xnoclassgc")) {
2754 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2755 // -Xconcgc
2756 } else if (match_option(option, "-Xconcgc")) {
2757 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2758 // -Xnoconcgc
2759 } else if (match_option(option, "-Xnoconcgc")) {
2760 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2761 // -Xbatch
2762 } else if (match_option(option, "-Xbatch")) {
2763 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2764 // -Xmn for compatibility with other JVM vendors
2765 } else if (match_option(option, "-Xmn", &tail)) {
2766 julong long_initial_young_size = 0;
2767 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2768 if (errcode != arg_in_range) {
2769 jio_fprintf(defaultStream::error_stream(),
2770 "Invalid initial young generation size: %s\n", option->optionString);
2771 describe_range_error(errcode);
2772 return JNI_EINVAL;
2773 }
2774 FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size);
2775 FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size);
2776 // -Xms
2777 } else if (match_option(option, "-Xms", &tail)) {
2778 julong long_initial_heap_size = 0;
2779 // an initial heap size of 0 means automatically determine
2780 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2781 if (errcode != arg_in_range) {
2782 jio_fprintf(defaultStream::error_stream(),
2783 "Invalid initial heap size: %s\n", option->optionString);
2784 describe_range_error(errcode);
2785 return JNI_EINVAL;
2786 }
2787 set_min_heap_size((size_t)long_initial_heap_size);
2788 // Currently the minimum size and the initial heap sizes are the same.
2789 // Can be overridden with -XX:InitialHeapSize.
2790 FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size);
2791 // -Xmx
2792 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2793 julong long_max_heap_size = 0;
2794 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2795 if (errcode != arg_in_range) {
2796 jio_fprintf(defaultStream::error_stream(),
2797 "Invalid maximum heap size: %s\n", option->optionString);
2798 describe_range_error(errcode);
2799 return JNI_EINVAL;
2800 }
2801 FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size);
2802 // Xmaxf
2803 } else if (match_option(option, "-Xmaxf", &tail)) {
2804 char* err;
2805 int maxf = (int)(strtod(tail, &err) * 100);
2806 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2807 jio_fprintf(defaultStream::error_stream(),
2808 "Bad max heap free percentage size: %s\n",
2809 option->optionString);
2810 return JNI_EINVAL;
2811 } else {
2812 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2813 }
2814 // Xminf
2815 } else if (match_option(option, "-Xminf", &tail)) {
2816 char* err;
2817 int minf = (int)(strtod(tail, &err) * 100);
2818 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2819 jio_fprintf(defaultStream::error_stream(),
2820 "Bad min heap free percentage size: %s\n",
2821 option->optionString);
2822 return JNI_EINVAL;
2823 } else {
2824 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2825 }
2826 // -Xss
2827 } else if (match_option(option, "-Xss", &tail)) {
2828 julong long_ThreadStackSize = 0;
2829 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2830 if (errcode != arg_in_range) {
2831 jio_fprintf(defaultStream::error_stream(),
2832 "Invalid thread stack size: %s\n", option->optionString);
2833 describe_range_error(errcode);
2834 return JNI_EINVAL;
2835 }
2836 // Internally track ThreadStackSize in units of 1024 bytes.
2837 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2838 round_to((int)long_ThreadStackSize, K) / K);
2839 // -Xoss
2840 } else if (match_option(option, "-Xoss", &tail)) {
2841 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2842 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2843 julong long_CodeCacheExpansionSize = 0;
2844 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2845 if (errcode != arg_in_range) {
2846 jio_fprintf(defaultStream::error_stream(),
2847 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2848 os::vm_page_size()/K);
2849 return JNI_EINVAL;
2850 }
2851 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2852 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2853 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2854 julong long_ReservedCodeCacheSize = 0;
2855
2856 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2857 if (errcode != arg_in_range) {
2858 jio_fprintf(defaultStream::error_stream(),
2859 "Invalid maximum code cache size: %s.\n", option->optionString);
2860 return JNI_EINVAL;
2861 }
2862 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2863 // -XX:NonNMethodCodeHeapSize=
2864 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2865 julong long_NonNMethodCodeHeapSize = 0;
2866
2867 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2868 if (errcode != arg_in_range) {
2869 jio_fprintf(defaultStream::error_stream(),
2870 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2871 return JNI_EINVAL;
2872 }
2873 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
2874 // -XX:ProfiledCodeHeapSize=
2875 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2876 julong long_ProfiledCodeHeapSize = 0;
2877
2878 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2879 if (errcode != arg_in_range) {
2880 jio_fprintf(defaultStream::error_stream(),
2881 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2882 return JNI_EINVAL;
2883 }
2884 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2885 // -XX:NonProfiledCodeHeapSizee=
2886 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2887 julong long_NonProfiledCodeHeapSize = 0;
2888
2889 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2890 if (errcode != arg_in_range) {
2891 jio_fprintf(defaultStream::error_stream(),
2892 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2893 return JNI_EINVAL;
2894 }
2895 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2896 //-XX:IncreaseFirstTierCompileThresholdAt=
2897 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2898 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2899 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2900 jio_fprintf(defaultStream::error_stream(),
2901 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2902 option->optionString);
2903 return JNI_EINVAL;
2904 }
2905 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2906 // -green
2907 } else if (match_option(option, "-green")) {
2908 jio_fprintf(defaultStream::error_stream(),
2909 "Green threads support not available\n");
2910 return JNI_EINVAL;
2911 // -native
2912 } else if (match_option(option, "-native")) {
2913 // HotSpot always uses native threads, ignore silently for compatibility
2914 // -Xsqnopause
2915 } else if (match_option(option, "-Xsqnopause")) {
2916 // EVM option, ignore silently for compatibility
2917 // -Xrs
2918 } else if (match_option(option, "-Xrs")) {
2919 // Classic/EVM option, new functionality
2920 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2921 } else if (match_option(option, "-Xusealtsigs")) {
2922 // change default internal VM signals used - lower case for back compat
2923 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2924 // -Xoptimize
2925 } else if (match_option(option, "-Xoptimize")) {
2926 // EVM option, ignore silently for compatibility
2927 // -Xprof
2928 } else if (match_option(option, "-Xprof")) {
2929 #if INCLUDE_FPROF
2930 _has_profile = true;
2931 #else // INCLUDE_FPROF
2932 jio_fprintf(defaultStream::error_stream(),
2933 "Flat profiling is not supported in this VM.\n");
2934 return JNI_ERR;
2935 #endif // INCLUDE_FPROF
2936 // -Xconcurrentio
2937 } else if (match_option(option, "-Xconcurrentio")) {
2938 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2939 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2940 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2941 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2942 FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2943
2944 // -Xinternalversion
2945 } else if (match_option(option, "-Xinternalversion")) {
2946 jio_fprintf(defaultStream::output_stream(), "%s\n",
2947 VM_Version::internal_vm_info_string());
2948 vm_exit(0);
2949 #ifndef PRODUCT
2950 // -Xprintflags
2951 } else if (match_option(option, "-Xprintflags")) {
2952 CommandLineFlags::printFlags(tty, false);
2953 vm_exit(0);
2954 #endif
2955 // -D
2956 } else if (match_option(option, "-D", &tail)) {
2957 const char* value;
2958 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2959 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2960 // abort if -Djava.endorsed.dirs is set
2961 jio_fprintf(defaultStream::output_stream(),
2962 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2963 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2964 return JNI_EINVAL;
2965 }
2966 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2967 *value != '\0' && strcmp(value, "\"\"") != 0) {
2968 // abort if -Djava.ext.dirs is set
2969 jio_fprintf(defaultStream::output_stream(),
2970 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2971 return JNI_EINVAL;
2972 }
2973
2974 if (!add_property(tail)) {
2975 return JNI_ENOMEM;
2976 }
2977 // Out of the box management support
2978 if (match_option(option, "-Dcom.sun.management", &tail)) {
2979 #if INCLUDE_MANAGEMENT
2980 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2981 #else
2982 jio_fprintf(defaultStream::output_stream(),
2983 "-Dcom.sun.management is not supported in this VM.\n");
2984 return JNI_ERR;
2985 #endif
2986 }
2987 // -Xint
2988 } else if (match_option(option, "-Xint")) {
2989 set_mode_flags(_int);
2990 // -Xmixed
2991 } else if (match_option(option, "-Xmixed")) {
2992 set_mode_flags(_mixed);
2993 // -Xcomp
2994 } else if (match_option(option, "-Xcomp")) {
2995 // for testing the compiler; turn off all flags that inhibit compilation
2996 set_mode_flags(_comp);
2997 // -Xshare:dump
2998 } else if (match_option(option, "-Xshare:dump")) {
2999 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3000 set_mode_flags(_int); // Prevent compilation, which creates objects
3001 // -Xshare:on
3002 } else if (match_option(option, "-Xshare:on")) {
3003 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3004 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3005 // -Xshare:auto
3006 } else if (match_option(option, "-Xshare:auto")) {
3007 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3008 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3009 // -Xshare:off
3010 } else if (match_option(option, "-Xshare:off")) {
3011 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3012 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3013 // -Xverify
3014 } else if (match_option(option, "-Xverify", &tail)) {
3015 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3016 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3017 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3018 } else if (strcmp(tail, ":remote") == 0) {
3019 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3020 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3021 } else if (strcmp(tail, ":none") == 0) {
3022 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3023 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3024 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3025 return JNI_EINVAL;
3026 }
3027 // -Xdebug
3028 } else if (match_option(option, "-Xdebug")) {
3029 // note this flag has been used, then ignore
3030 set_xdebug_mode(true);
3031 // -Xnoagent
3032 } else if (match_option(option, "-Xnoagent")) {
3033 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3034 } else if (match_option(option, "-Xboundthreads")) {
3035 // Ignore silently for compatibility
3036 } else if (match_option(option, "-Xloggc:", &tail)) {
3037 // Redirect GC output to the file. -Xloggc:<filename>
3038 // ostream_init_log(), when called will use this filename
3039 // to initialize a fileStream.
3040 _gc_log_filename = os::strdup_check_oom(tail);
3041 if (!is_filename_valid(_gc_log_filename)) {
3042 jio_fprintf(defaultStream::output_stream(),
3043 "Invalid file name for use with -Xloggc: Filename can only contain the "
3044 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3045 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3046 return JNI_EINVAL;
3047 }
3048 FLAG_SET_CMDLINE(bool, PrintGC, true);
3049 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3050
3051 // JNI hooks
3052 } else if (match_option(option, "-Xcheck", &tail)) {
3053 if (!strcmp(tail, ":jni")) {
3054 #if !INCLUDE_JNI_CHECK
3055 warning("JNI CHECKING is not supported in this VM");
3056 #else
3057 CheckJNICalls = true;
3058 #endif // INCLUDE_JNI_CHECK
3059 } else if (is_bad_option(option, args->ignoreUnrecognized,
3060 "check")) {
3061 return JNI_EINVAL;
3062 }
3063 } else if (match_option(option, "vfprintf")) {
3064 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3065 } else if (match_option(option, "exit")) {
3066 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3067 } else if (match_option(option, "abort")) {
3068 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3069 // -XX:+AggressiveHeap
3070 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3071
3072 // This option inspects the machine and attempts to set various
3073 // parameters to be optimal for long-running, memory allocation
3074 // intensive jobs. It is intended for machines with large
3075 // amounts of cpu and memory.
3076
3077 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3078 // VM, but we may not be able to represent the total physical memory
3079 // available (like having 8gb of memory on a box but using a 32bit VM).
3080 // Thus, we need to make sure we're using a julong for intermediate
3081 // calculations.
3082 julong initHeapSize;
3083 julong total_memory = os::physical_memory();
3084
3085 if (total_memory < (julong)256*M) {
3086 jio_fprintf(defaultStream::error_stream(),
3087 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3088 vm_exit(1);
3089 }
3090
3091 // The heap size is half of available memory, or (at most)
3092 // all of possible memory less 160mb (leaving room for the OS
3093 // when using ISM). This is the maximum; because adaptive sizing
3094 // is turned on below, the actual space used may be smaller.
3095
3096 initHeapSize = MIN2(total_memory / (julong)2,
3097 total_memory - (julong)160*M);
3098
3099 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3100
3101 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3102 FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize);
3103 FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize);
3104 // Currently the minimum size and the initial heap sizes are the same.
3105 set_min_heap_size(initHeapSize);
3106 }
3107 if (FLAG_IS_DEFAULT(NewSize)) {
3108 // Make the young generation 3/8ths of the total heap.
3109 FLAG_SET_CMDLINE(size_t, NewSize,
3110 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3111 FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize);
3112 }
3113
3114 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3115 FLAG_SET_DEFAULT(UseLargePages, true);
3116 #endif
3117
3118 // Increase some data structure sizes for efficiency
3119 FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize);
3120 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3121 FLAG_SET_CMDLINE(size_t, TLABSize, 256*K);
3122
3123 // See the OldPLABSize comment below, but replace 'after promotion'
3124 // with 'after copying'. YoungPLABSize is the size of the survivor
3125 // space per-gc-thread buffers. The default is 4kw.
3126 FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K); // Note: this is in words
3127
3128 // OldPLABSize is the size of the buffers in the old gen that
3129 // UseParallelGC uses to promote live data that doesn't fit in the
3130 // survivor spaces. At any given time, there's one for each gc thread.
3131 // The default size is 1kw. These buffers are rarely used, since the
3132 // survivor spaces are usually big enough. For specjbb, however, there
3133 // are occasions when there's lots of live data in the young gen
3134 // and we end up promoting some of it. We don't have a definite
3135 // explanation for why bumping OldPLABSize helps, but the theory
3136 // is that a bigger PLAB results in retaining something like the
3137 // original allocation order after promotion, which improves mutator
3138 // locality. A minor effect may be that larger PLABs reduce the
3139 // number of PLAB allocation events during gc. The value of 8kw
3140 // was arrived at by experimenting with specjbb.
3141 FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K); // Note: this is in words
3142
3143 // Enable parallel GC and adaptive generation sizing
3144 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3145 FLAG_SET_DEFAULT(ParallelGCThreads,
3146 Abstract_VM_Version::parallel_worker_threads());
3147
3148 // Encourage steady state memory management
3149 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3150
3151 // This appears to improve mutator locality
3152 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3153
3154 // Get around early Solaris scheduling bug
3155 // (affinity vs other jobs on system)
3156 // but disallow DR and offlining (5008695).
3157 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3158
3159 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3160 // and the last option wins.
3161 } else if (match_option(option, "-XX:+NeverTenure")) {
3162 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3163 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3164 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3165 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3166 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3167 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3168 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3169 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3170 uintx max_tenuring_thresh = 0;
3171 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3172 jio_fprintf(defaultStream::error_stream(),
3173 "Improperly specified VM option 'MaxTenuringThreshold=%s'\n", tail);
3174 return JNI_EINVAL;
3175 }
3176 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3177
3178 if (MaxTenuringThreshold == 0) {
3179 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3180 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3181 } else {
3182 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3183 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3184 }
3185 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3186 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3187 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3188 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3189 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3190 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3191 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3192 #if defined(DTRACE_ENABLED)
3193 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3194 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3195 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3196 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3197 #else // defined(DTRACE_ENABLED)
3198 jio_fprintf(defaultStream::error_stream(),
3199 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3200 return JNI_EINVAL;
3201 #endif // defined(DTRACE_ENABLED)
3202 #ifdef ASSERT
3203 } else if (match_option(option, "-XX:+FullGCALot")) {
3204 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3205 // disable scavenge before parallel mark-compact
3206 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3207 #endif
3208 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3209 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3210 julong stack_size = 0;
3211 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3212 if (errcode != arg_in_range) {
3213 jio_fprintf(defaultStream::error_stream(),
3214 "Invalid mark stack size: %s\n", option->optionString);
3215 describe_range_error(errcode);
3216 return JNI_EINVAL;
3217 }
3218 jio_fprintf(defaultStream::error_stream(),
3219 "Please use -XX:MarkStackSize in place of "
3220 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n");
3221 FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size);
3222 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3223 julong max_stack_size = 0;
3224 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3225 if (errcode != arg_in_range) {
3226 jio_fprintf(defaultStream::error_stream(),
3227 "Invalid maximum mark stack size: %s\n",
3228 option->optionString);
3229 describe_range_error(errcode);
3230 return JNI_EINVAL;
3231 }
3232 jio_fprintf(defaultStream::error_stream(),
3233 "Please use -XX:MarkStackSizeMax in place of "
3234 "-XX:CMSMarkStackSizeMax in the future\n");
3235 FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size);
3236 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3237 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3238 uintx conc_threads = 0;
3239 if (!parse_uintx(tail, &conc_threads, 1)) {
3240 jio_fprintf(defaultStream::error_stream(),
3241 "Invalid concurrent threads: %s\n", option->optionString);
3242 return JNI_EINVAL;
3243 }
3244 jio_fprintf(defaultStream::error_stream(),
3245 "Please use -XX:ConcGCThreads in place of "
3246 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n");
3247 FLAG_SET_CMDLINE(uint, ConcGCThreads, conc_threads);
3248 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3249 julong max_direct_memory_size = 0;
3250 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3251 if (errcode != arg_in_range) {
3252 jio_fprintf(defaultStream::error_stream(),
3253 "Invalid maximum direct memory size: %s\n",
3254 option->optionString);
3255 describe_range_error(errcode);
3256 return JNI_EINVAL;
3257 }
3258 FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size);
3259 #if !INCLUDE_MANAGEMENT
3260 } else if (match_option(option, "-XX:+ManagementServer")) {
3261 jio_fprintf(defaultStream::error_stream(),
3262 "ManagementServer is not supported in this VM.\n");
3263 return JNI_ERR;
3264 #endif // INCLUDE_MANAGEMENT
3265 // CreateMinidumpOnCrash is removed, and replaced by CreateCoredumpOnCrash
3266 } else if (match_option(option, "-XX:+CreateMinidumpOnCrash")) {
3267 FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, true);
3268 jio_fprintf(defaultStream::output_stream(),
3269 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is on\n");
3270 } else if (match_option(option, "-XX:-CreateMinidumpOnCrash")) {
3271 FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, false);
3272 jio_fprintf(defaultStream::output_stream(),
3273 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is off\n");
3274 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3275 // Skip -XX:Flags= since that case has already been handled
3276 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3277 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3278 return JNI_EINVAL;
3279 }
3280 }
3281 // Unknown option
3282 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3283 return JNI_ERR;
3284 }
3285 }
3286
3287 // PrintSharedArchiveAndExit will turn on
3288 // -Xshare:on
3289 // -XX:+TraceClassPaths
3290 if (PrintSharedArchiveAndExit) {
3291 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3292 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3293 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3294 }
3295
3296 // Change the default value for flags which have different default values
3297 // when working with older JDKs.
3298 #ifdef LINUX
3299 if (JDK_Version::current().compare_major(6) <= 0 &&
3300 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3301 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3302 }
3303 #endif // LINUX
3304 fix_appclasspath();
3305 return JNI_OK;
3306 }
3307
3308 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3309 //
3310 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3311 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3312 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3313 // path is treated as the current directory.
3314 //
3315 // This causes problems with CDS, which requires that all directories specified in the classpath
3316 // must be empty. In most cases, applications do NOT want to load classes from the current
3317 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3318 // scripts compatible with CDS.
3319 void Arguments::fix_appclasspath() {
3320 if (IgnoreEmptyClassPaths) {
3321 const char separator = *os::path_separator();
3322 const char* src = _java_class_path->value();
3323
3324 // skip over all the leading empty paths
3325 while (*src == separator) {
3326 src ++;
3327 }
3328
3329 char* copy = os::strdup_check_oom(src, mtInternal);
3330
3331 // trim all trailing empty paths
3332 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3333 *tail = '\0';
3334 }
3335
3336 char from[3] = {separator, separator, '\0'};
3337 char to [2] = {separator, '\0'};
3338 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3339 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3340 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3341 }
3342
3343 _java_class_path->set_value(copy);
3344 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3345 }
3346
3347 if (!PrintSharedArchiveAndExit) {
3348 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3349 }
3350 }
3351
3352 static bool has_jar_files(const char* directory) {
3353 DIR* dir = os::opendir(directory);
3354 if (dir == NULL) return false;
3355
3356 struct dirent *entry;
3357 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3358 bool hasJarFile = false;
3359 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3360 const char* name = entry->d_name;
3361 const char* ext = name + strlen(name) - 4;
3362 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3363 }
3364 FREE_C_HEAP_ARRAY(char, dbuf);
3365 os::closedir(dir);
3366 return hasJarFile ;
3367 }
3368
3369 static int check_non_empty_dirs(const char* path) {
3370 const char separator = *os::path_separator();
3371 const char* const end = path + strlen(path);
3372 int nonEmptyDirs = 0;
3373 while (path < end) {
3374 const char* tmp_end = strchr(path, separator);
3375 if (tmp_end == NULL) {
3376 if (has_jar_files(path)) {
3377 nonEmptyDirs++;
3378 jio_fprintf(defaultStream::output_stream(),
3379 "Non-empty directory: %s\n", path);
3380 }
3381 path = end;
3382 } else {
3383 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3384 memcpy(dirpath, path, tmp_end - path);
3385 dirpath[tmp_end - path] = '\0';
3386 if (has_jar_files(dirpath)) {
3387 nonEmptyDirs++;
3388 jio_fprintf(defaultStream::output_stream(),
3389 "Non-empty directory: %s\n", dirpath);
3390 }
3391 FREE_C_HEAP_ARRAY(char, dirpath);
3392 path = tmp_end + 1;
3393 }
3394 }
3395 return nonEmptyDirs;
3396 }
3397
3398 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3399 // check if the default lib/endorsed directory exists; if so, error
3400 char path[JVM_MAXPATHLEN];
3401 const char* fileSep = os::file_separator();
3402 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3403
3404 if (CheckEndorsedAndExtDirs) {
3405 int nonEmptyDirs = 0;
3406 // check endorsed directory
3407 nonEmptyDirs += check_non_empty_dirs(path);
3408 // check the extension directories
3409 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3410 if (nonEmptyDirs > 0) {
3411 return JNI_ERR;
3412 }
3413 }
3414
3415 DIR* dir = os::opendir(path);
3416 if (dir != NULL) {
3417 jio_fprintf(defaultStream::output_stream(),
3418 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3419 "in modular form will be supported via the concept of upgradeable modules.\n");
3420 os::closedir(dir);
3421 return JNI_ERR;
3422 }
3423
3424 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3425 dir = os::opendir(path);
3426 if (dir != NULL) {
3427 jio_fprintf(defaultStream::output_stream(),
3428 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3429 "Use -classpath instead.\n.");
3430 os::closedir(dir);
3431 return JNI_ERR;
3432 }
3433
3434 if (scp_assembly_required) {
3435 // Assemble the bootclasspath elements into the final path.
3436 Arguments::set_sysclasspath(scp_p->combined_path());
3437 }
3438
3439 // This must be done after all arguments have been processed.
3440 // java_compiler() true means set to "NONE" or empty.
3441 if (java_compiler() && !xdebug_mode()) {
3442 // For backwards compatibility, we switch to interpreted mode if
3443 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3444 // not specified.
3445 set_mode_flags(_int);
3446 }
3447
3448 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3449 // but like -Xint, leave compilation thresholds unaffected.
3450 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3451 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3452 set_mode_flags(_int);
3453 }
3454
3455 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3456 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3457 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3458 }
3459
3460 #ifndef COMPILER2
3461 // Don't degrade server performance for footprint
3462 if (FLAG_IS_DEFAULT(UseLargePages) &&
3463 MaxHeapSize < LargePageHeapSizeThreshold) {
3464 // No need for large granularity pages w/small heaps.
3465 // Note that large pages are enabled/disabled for both the
3466 // Java heap and the code cache.
3467 FLAG_SET_DEFAULT(UseLargePages, false);
3468 }
3469
3470 #else
3471 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3472 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3473 }
3474 #endif
3475
3476 #ifndef TIERED
3477 // Tiered compilation is undefined.
3478 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3479 #endif
3480
3481 // If we are running in a headless jre, force java.awt.headless property
3482 // to be true unless the property has already been set.
3483 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3484 if (os::is_headless_jre()) {
3485 const char* headless = Arguments::get_property("java.awt.headless");
3486 if (headless == NULL) {
3487 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3488 if (headless_env == NULL) {
3489 if (!add_property("java.awt.headless=true")) {
3490 return JNI_ENOMEM;
3491 }
3492 } else {
3493 char buffer[256];
3494 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3495 if (!add_property(buffer)) {
3496 return JNI_ENOMEM;
3497 }
3498 }
3499 }
3500 }
3501
3502 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3503 // CMS can only be used with ParNew
3504 FLAG_SET_ERGO(bool, UseParNewGC, true);
3505 }
3506
3507 if (!check_vm_args_consistency()) {
3508 return JNI_ERR;
3509 }
3510
3511 return JNI_OK;
3512 }
3513
3514 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3515 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3516 scp_assembly_required_p);
3517 }
3518
3519 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3520 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3521 scp_assembly_required_p);
3522 }
3523
3524 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3525 char *buffer = ::getenv(name);
3526
3527 // Don't check this variable if user has special privileges
3528 // (e.g. unix su command).
3529 if (buffer == NULL || os::have_special_privileges()) {
3530 return JNI_OK;
3531 }
3532
3533 if ((buffer = os::strdup(buffer)) == NULL) {
3534 return JNI_ENOMEM;
3535 }
3536
3537 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3538 jio_fprintf(defaultStream::error_stream(),
3539 "Picked up %s: %s\n", name, buffer);
3540 char* rd = buffer; // pointer to the input string (rd)
3541 while (true) { // repeat for all options in the input string
3542 while (isspace(*rd)) rd++; // skip whitespace
3543 if (*rd == 0) break; // we re done when the input string is read completely
3544
3545 // The output, option string, overwrites the input string.
3546 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3547 // input string (rd).
3548 char* wrt = rd;
3549
3550 JavaVMOption option;
3551 option.optionString = wrt;
3552 options->append(option); // Fill in option
3553 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3554 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3555 int quote = *rd; // matching quote to look for
3556 rd++; // don't copy open quote
3557 while (*rd != quote) { // include everything (even spaces) up until quote
3558 if (*rd == 0) { // string termination means unmatched string
3559 jio_fprintf(defaultStream::error_stream(),
3560 "Unmatched quote in %s\n", name);
3561 delete options;
3562 os::free(buffer);
3563 return JNI_ERR;
3564 }
3565 *wrt++ = *rd++; // copy to option string
3566 }
3567 rd++; // don't copy close quote
3568 } else {
3569 *wrt++ = *rd++; // copy to option string
3570 }
3571 }
3572 // Need to check if we're done before writing a NULL,
3573 // because the write could be to the byte that rd is pointing to.
3574 if (*rd++ == 0) {
3575 *wrt = 0;
3576 break;
3577 }
3578 *wrt = 0; // Zero terminate option
3579 }
3580 JavaVMOption* options_arr =
3581 NEW_C_HEAP_ARRAY_RETURN_NULL(JavaVMOption, options->length(), mtInternal);
3582 if (options_arr == NULL) {
3583 delete options;
3584 os::free(buffer);
3585 return JNI_ENOMEM;
3586 }
3587 for (int i = 0; i < options->length(); i++) {
3588 options_arr[i] = options->at(i);
3589 }
3590
3591 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3592 JavaVMInitArgs vm_args;
3593 vm_args.version = JNI_VERSION_1_2;
3594 vm_args.options = options_arr;
3595 vm_args.nOptions = options->length();
3596 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3597
3598 if (PrintVMOptions) {
3599 const char* tail;
3600 for (int i = 0; i < vm_args.nOptions; i++) {
3601 const JavaVMOption *option = vm_args.options + i;
3602 if (match_option(option, "-XX:", &tail)) {
3603 logOption(tail);
3604 }
3605 }
3606 }
3607
3608 jint result = parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p,
3609 Flag::ENVIRON_VAR);
3610 FREE_C_HEAP_ARRAY(JavaVMOption, options_arr);
3611 delete options;
3612 os::free(buffer);
3613 return result;
3614 }
3615
3616 void Arguments::set_shared_spaces_flags() {
3617 if (DumpSharedSpaces) {
3618 if (RequireSharedSpaces) {
3619 warning("cannot dump shared archive while using shared archive");
3620 }
3621 UseSharedSpaces = false;
3622 #ifdef _LP64
3623 if (!UseCompressedOops || !UseCompressedClassPointers) {
3624 vm_exit_during_initialization(
3625 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3626 }
3627 } else {
3628 if (!UseCompressedOops || !UseCompressedClassPointers) {
3629 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3630 }
3631 #endif
3632 }
3633 }
3634
3635 #if !INCLUDE_ALL_GCS
3636 static void force_serial_gc() {
3637 FLAG_SET_DEFAULT(UseSerialGC, true);
3638 UNSUPPORTED_GC_OPTION(UseG1GC);
3639 UNSUPPORTED_GC_OPTION(UseParallelGC);
3640 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3641 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3642 UNSUPPORTED_GC_OPTION(UseParNewGC);
3643 }
3644 #endif // INCLUDE_ALL_GCS
3645
3646 // Sharing support
3647 // Construct the path to the archive
3648 static char* get_shared_archive_path() {
3649 char *shared_archive_path;
3650 if (SharedArchiveFile == NULL) {
3651 char jvm_path[JVM_MAXPATHLEN];
3652 os::jvm_path(jvm_path, sizeof(jvm_path));
3653 char *end = strrchr(jvm_path, *os::file_separator());
3654 if (end != NULL) *end = '\0';
3655 size_t jvm_path_len = strlen(jvm_path);
3656 size_t file_sep_len = strlen(os::file_separator());
3657 const size_t len = jvm_path_len + file_sep_len + 20;
3658 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3659 if (shared_archive_path != NULL) {
3660 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3661 jvm_path, os::file_separator());
3662 }
3663 } else {
3664 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3665 }
3666 return shared_archive_path;
3667 }
3668
3669 #ifndef PRODUCT
3670 // Determine whether LogVMOutput should be implicitly turned on.
3671 static bool use_vm_log() {
3672 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3673 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3674 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3675 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3676 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3677 return true;
3678 }
3679
3680 #ifdef COMPILER1
3681 if (PrintC1Statistics) {
3682 return true;
3683 }
3684 #endif // COMPILER1
3685
3686 #ifdef COMPILER2
3687 if (PrintOptoAssembly || PrintOptoStatistics) {
3688 return true;
3689 }
3690 #endif // COMPILER2
3691
3692 return false;
3693 }
3694 #endif // PRODUCT
3695
3696 // Parse entry point called from JNI_CreateJavaVM
3697
3698 jint Arguments::parse(const JavaVMInitArgs* args) {
3699
3700 // Remaining part of option string
3701 const char* tail;
3702
3703 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3704 const char* hotspotrc = ".hotspotrc";
3705 bool settings_file_specified = false;
3706 bool needs_hotspotrc_warning = false;
3707
3708 const char* flags_file;
3709 int index;
3710 for (index = 0; index < args->nOptions; index++) {
3711 const JavaVMOption *option = args->options + index;
3712 if (ArgumentsExt::process_options(option)) {
3713 continue;
3714 }
3715 if (match_option(option, "-XX:Flags=", &tail)) {
3716 flags_file = tail;
3717 settings_file_specified = true;
3718 continue;
3719 }
3720 if (match_option(option, "-XX:+PrintVMOptions")) {
3721 PrintVMOptions = true;
3722 continue;
3723 }
3724 if (match_option(option, "-XX:-PrintVMOptions")) {
3725 PrintVMOptions = false;
3726 continue;
3727 }
3728 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3729 IgnoreUnrecognizedVMOptions = true;
3730 continue;
3731 }
3732 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3733 IgnoreUnrecognizedVMOptions = false;
3734 continue;
3735 }
3736 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3737 CommandLineFlags::printFlags(tty, false);
3738 vm_exit(0);
3739 }
3740 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3741 #if INCLUDE_NMT
3742 // The launcher did not setup nmt environment variable properly.
3743 if (!MemTracker::check_launcher_nmt_support(tail)) {
3744 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3745 }
3746
3747 // Verify if nmt option is valid.
3748 if (MemTracker::verify_nmt_option()) {
3749 // Late initialization, still in single-threaded mode.
3750 if (MemTracker::tracking_level() >= NMT_summary) {
3751 MemTracker::init();
3752 }
3753 } else {
3754 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3755 }
3756 continue;
3757 #else
3758 jio_fprintf(defaultStream::error_stream(),
3759 "Native Memory Tracking is not supported in this VM\n");
3760 return JNI_ERR;
3761 #endif
3762 }
3763
3764 #ifndef PRODUCT
3765 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3766 CommandLineFlags::printFlags(tty, true);
3767 vm_exit(0);
3768 }
3769 #endif
3770 }
3771
3772 if (IgnoreUnrecognizedVMOptions) {
3773 // uncast const to modify the flag args->ignoreUnrecognized
3774 *(jboolean*)(&args->ignoreUnrecognized) = true;
3775 }
3776
3777 // Parse specified settings file
3778 if (settings_file_specified) {
3779 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3780 return JNI_EINVAL;
3781 }
3782 } else {
3783 #ifdef ASSERT
3784 // Parse default .hotspotrc settings file
3785 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3786 return JNI_EINVAL;
3787 }
3788 #else
3789 struct stat buf;
3790 if (os::stat(hotspotrc, &buf) == 0) {
3791 needs_hotspotrc_warning = true;
3792 }
3793 #endif
3794 }
3795
3796 if (PrintVMOptions) {
3797 for (index = 0; index < args->nOptions; index++) {
3798 const JavaVMOption *option = args->options + index;
3799 if (match_option(option, "-XX:", &tail)) {
3800 logOption(tail);
3801 }
3802 }
3803 }
3804
3805 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3806 jint result = parse_vm_init_args(args);
3807 if (result != JNI_OK) {
3808 return result;
3809 }
3810
3811 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3812 SharedArchivePath = get_shared_archive_path();
3813 if (SharedArchivePath == NULL) {
3814 return JNI_ENOMEM;
3815 }
3816
3817 // Set up VerifySharedSpaces
3818 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3819 VerifySharedSpaces = true;
3820 }
3821
3822 // Delay warning until here so that we've had a chance to process
3823 // the -XX:-PrintWarnings flag
3824 if (needs_hotspotrc_warning) {
3825 warning("%s file is present but has been ignored. "
3826 "Run with -XX:Flags=%s to load the file.",
3827 hotspotrc, hotspotrc);
3828 }
3829
3830 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3831 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3832 #endif
3833
3834 ArgumentsExt::report_unsupported_options();
3835
3836 #ifndef PRODUCT
3837 if (TraceBytecodesAt != 0) {
3838 TraceBytecodes = true;
3839 }
3840 if (CountCompiledCalls) {
3841 if (UseCounterDecay) {
3842 warning("UseCounterDecay disabled because CountCalls is set");
3843 UseCounterDecay = false;
3844 }
3845 }
3846 #endif // PRODUCT
3847
3848 if (ScavengeRootsInCode == 0) {
3849 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3850 warning("forcing ScavengeRootsInCode non-zero");
3851 }
3852 ScavengeRootsInCode = 1;
3853 }
3854
3855 if (PrintGCDetails) {
3856 // Turn on -verbose:gc options as well
3857 PrintGC = true;
3858 }
3859
3860 // Set object alignment values.
3861 set_object_alignment();
3862
3863 #if !INCLUDE_ALL_GCS
3864 force_serial_gc();
3865 #endif // INCLUDE_ALL_GCS
3866 #if !INCLUDE_CDS
3867 if (DumpSharedSpaces || RequireSharedSpaces) {
3868 jio_fprintf(defaultStream::error_stream(),
3869 "Shared spaces are not supported in this VM\n");
3870 return JNI_ERR;
3871 }
3872 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3873 warning("Shared spaces are not supported in this VM");
3874 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3875 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3876 }
3877 no_shared_spaces("CDS Disabled");
3878 #endif // INCLUDE_CDS
3879
3880 return JNI_OK;
3881 }
3882
3883 jint Arguments::apply_ergo() {
3884
3885 // Set flags based on ergonomics.
3886 set_ergonomics_flags();
3887
3888 set_shared_spaces_flags();
3889
3890 // Check the GC selections again.
3891 if (!check_gc_consistency()) {
3892 return JNI_EINVAL;
3893 }
3894
3895 if (TieredCompilation) {
3896 set_tiered_flags();
3897 } else {
3898 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3899 if (CompilationPolicyChoice >= 2) {
3900 vm_exit_during_initialization(
3901 "Incompatible compilation policy selected", NULL);
3902 }
3903 // Scale CompileThreshold
3904 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
3905 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
3906 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
3907 }
3908 }
3909
3910 #ifdef COMPILER2
3911 #ifndef PRODUCT
3912 if (PrintIdealGraphLevel > 0) {
3913 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3914 }
3915 #endif
3916 #endif
3917
3918 // Set heap size based on available physical memory
3919 set_heap_size();
3920
3921 ArgumentsExt::set_gc_specific_flags();
3922
3923 // Initialize Metaspace flags and alignments
3924 Metaspace::ergo_initialize();
3925
3926 // Set bytecode rewriting flags
3927 set_bytecode_flags();
3928
3929 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3930 set_aggressive_opts_flags();
3931
3932 // Turn off biased locking for locking debug mode flags,
3933 // which are subtly different from each other but neither works with
3934 // biased locking
3935 if (UseHeavyMonitors
3936 #ifdef COMPILER1
3937 || !UseFastLocking
3938 #endif // COMPILER1
3939 ) {
3940 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3941 // flag set to true on command line; warn the user that they
3942 // can't enable biased locking here
3943 warning("Biased Locking is not supported with locking debug flags"
3944 "; ignoring UseBiasedLocking flag." );
3945 }
3946 UseBiasedLocking = false;
3947 }
3948
3949 #ifdef ZERO
3950 // Clear flags not supported on zero.
3951 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3952 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3953 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3954 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3955 #endif // CC_INTERP
3956
3957 #ifdef COMPILER2
3958 if (!EliminateLocks) {
3959 EliminateNestedLocks = false;
3960 }
3961 if (!Inline) {
3962 IncrementalInline = false;
3963 }
3964 #ifndef PRODUCT
3965 if (!IncrementalInline) {
3966 AlwaysIncrementalInline = false;
3967 }
3968 #endif
3969 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3970 // nothing to use the profiling, turn if off
3971 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3972 }
3973 #endif
3974
3975 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3976 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3977 DebugNonSafepoints = true;
3978 }
3979
3980 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3981 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3982 }
3983
3984 #ifndef PRODUCT
3985 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3986 if (use_vm_log()) {
3987 LogVMOutput = true;
3988 }
3989 }
3990 #endif // PRODUCT
3991
3992 if (PrintCommandLineFlags) {
3993 CommandLineFlags::printSetFlags(tty);
3994 }
3995
3996 // Apply CPU specific policy for the BiasedLocking
3997 if (UseBiasedLocking) {
3998 if (!VM_Version::use_biased_locking() &&
3999 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4000 UseBiasedLocking = false;
4001 }
4002 }
4003 #ifdef COMPILER2
4004 if (!UseBiasedLocking || EmitSync != 0) {
4005 UseOptoBiasInlining = false;
4006 }
4007 #endif
4008
4009 return JNI_OK;
4010 }
4011
4012 jint Arguments::adjust_after_os() {
4013 if (UseNUMA) {
4014 if (UseParallelGC || UseParallelOldGC) {
4015 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4016 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4017 }
4018 }
4019 // UseNUMAInterleaving is set to ON for all collectors and
4020 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4021 // such as the parallel collector for Linux and Solaris will
4022 // interleave old gen and survivor spaces on top of NUMA
4023 // allocation policy for the eden space.
4024 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4025 // all platforms and ParallelGC on Windows will interleave all
4026 // of the heap spaces across NUMA nodes.
4027 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4028 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4029 }
4030 }
4031 return JNI_OK;
4032 }
4033
4034 int Arguments::PropertyList_count(SystemProperty* pl) {
4035 int count = 0;
4036 while(pl != NULL) {
4037 count++;
4038 pl = pl->next();
4039 }
4040 return count;
4041 }
4042
4043 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4044 assert(key != NULL, "just checking");
4045 SystemProperty* prop;
4046 for (prop = pl; prop != NULL; prop = prop->next()) {
4047 if (strcmp(key, prop->key()) == 0) return prop->value();
4048 }
4049 return NULL;
4050 }
4051
4052 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4053 int count = 0;
4054 const char* ret_val = NULL;
4055
4056 while(pl != NULL) {
4057 if(count >= index) {
4058 ret_val = pl->key();
4059 break;
4060 }
4061 count++;
4062 pl = pl->next();
4063 }
4064
4065 return ret_val;
4066 }
4067
4068 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4069 int count = 0;
4070 char* ret_val = NULL;
4071
4072 while(pl != NULL) {
4073 if(count >= index) {
4074 ret_val = pl->value();
4075 break;
4076 }
4077 count++;
4078 pl = pl->next();
4079 }
4080
4081 return ret_val;
4082 }
4083
4084 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4085 SystemProperty* p = *plist;
4086 if (p == NULL) {
4087 *plist = new_p;
4088 } else {
4089 while (p->next() != NULL) {
4090 p = p->next();
4091 }
4092 p->set_next(new_p);
4093 }
4094 }
4095
4096 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4097 if (plist == NULL)
4098 return;
4099
4100 SystemProperty* new_p = new SystemProperty(k, v, true);
4101 PropertyList_add(plist, new_p);
4102 }
4103
4104 void Arguments::PropertyList_add(SystemProperty *element) {
4105 PropertyList_add(&_system_properties, element);
4106 }
4107
4108 // This add maintains unique property key in the list.
4109 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4110 if (plist == NULL)
4111 return;
4112
4113 // If property key exist then update with new value.
4114 SystemProperty* prop;
4115 for (prop = *plist; prop != NULL; prop = prop->next()) {
4116 if (strcmp(k, prop->key()) == 0) {
4117 if (append) {
4118 prop->append_value(v);
4119 } else {
4120 prop->set_value(v);
4121 }
4122 return;
4123 }
4124 }
4125
4126 PropertyList_add(plist, k, v);
4127 }
4128
4129 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4130 // Returns true if all of the source pointed by src has been copied over to
4131 // the destination buffer pointed by buf. Otherwise, returns false.
4132 // Notes:
4133 // 1. If the length (buflen) of the destination buffer excluding the
4134 // NULL terminator character is not long enough for holding the expanded
4135 // pid characters, it also returns false instead of returning the partially
4136 // expanded one.
4137 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4138 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4139 char* buf, size_t buflen) {
4140 const char* p = src;
4141 char* b = buf;
4142 const char* src_end = &src[srclen];
4143 char* buf_end = &buf[buflen - 1];
4144
4145 while (p < src_end && b < buf_end) {
4146 if (*p == '%') {
4147 switch (*(++p)) {
4148 case '%': // "%%" ==> "%"
4149 *b++ = *p++;
4150 break;
4151 case 'p': { // "%p" ==> current process id
4152 // buf_end points to the character before the last character so
4153 // that we could write '\0' to the end of the buffer.
4154 size_t buf_sz = buf_end - b + 1;
4155 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4156
4157 // if jio_snprintf fails or the buffer is not long enough to hold
4158 // the expanded pid, returns false.
4159 if (ret < 0 || ret >= (int)buf_sz) {
4160 return false;
4161 } else {
4162 b += ret;
4163 assert(*b == '\0', "fail in copy_expand_pid");
4164 if (p == src_end && b == buf_end + 1) {
4165 // reach the end of the buffer.
4166 return true;
4167 }
4168 }
4169 p++;
4170 break;
4171 }
4172 default :
4173 *b++ = '%';
4174 }
4175 } else {
4176 *b++ = *p++;
4177 }
4178 }
4179 *b = '\0';
4180 return (p == src_end); // return false if not all of the source was copied
4181 }