1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "compiler/compilerOracle.hpp"
31 #include "gc/shared/cardTableRS.hpp"
32 #include "gc/shared/genCollectedHeap.hpp"
33 #include "gc/shared/referenceProcessor.hpp"
34 #include "gc/shared/taskqueue.hpp"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/universe.inline.hpp"
37 #include "oops/oop.inline.hpp"
38 #include "prims/jvmtiExport.hpp"
39 #include "runtime/arguments.hpp"
40 #include "runtime/arguments_ext.hpp"
41 #include "runtime/globals_extension.hpp"
42 #include "runtime/java.hpp"
43 #include "runtime/os.hpp"
44 #include "runtime/vm_version.hpp"
45 #include "services/management.hpp"
46 #include "services/memTracker.hpp"
47 #include "utilities/defaultStream.hpp"
48 #include "utilities/macros.hpp"
49 #include "utilities/stringUtils.hpp"
50 #if INCLUDE_ALL_GCS
51 #include "gc/cms/compactibleFreeListSpace.hpp"
52 #include "gc/g1/g1CollectedHeap.inline.hpp"
53 #include "gc/parallel/parallelScavengeHeap.hpp"
54 #endif // INCLUDE_ALL_GCS
55
56 // Note: This is a special bug reporting site for the JVM
57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
58 #define DEFAULT_JAVA_LAUNCHER "generic"
59
60 #define UNSUPPORTED_GC_OPTION(gc) \
61 do { \
62 if (gc) { \
63 if (FLAG_IS_CMDLINE(gc)) { \
64 warning(#gc " is not supported in this VM. Using Serial GC."); \
65 } \
66 FLAG_SET_DEFAULT(gc, false); \
67 } \
68 } while(0)
69
70 char** Arguments::_jvm_flags_array = NULL;
71 int Arguments::_num_jvm_flags = 0;
72 char** Arguments::_jvm_args_array = NULL;
73 int Arguments::_num_jvm_args = 0;
74 char* Arguments::_java_command = NULL;
75 SystemProperty* Arguments::_system_properties = NULL;
76 const char* Arguments::_gc_log_filename = NULL;
77 bool Arguments::_has_profile = false;
78 size_t Arguments::_conservative_max_heap_alignment = 0;
79 size_t Arguments::_min_heap_size = 0;
80 uintx Arguments::_min_heap_free_ratio = 0;
81 uintx Arguments::_max_heap_free_ratio = 0;
82 Arguments::Mode Arguments::_mode = _mixed;
83 bool Arguments::_java_compiler = false;
84 bool Arguments::_xdebug_mode = false;
85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
87 int Arguments::_sun_java_launcher_pid = -1;
88 bool Arguments::_sun_java_launcher_is_altjvm = false;
89
90 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
93 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
94 bool Arguments::_ClipInlining = ClipInlining;
95 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
96 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
97
98 char* Arguments::SharedArchivePath = NULL;
99
100 AgentLibraryList Arguments::_libraryList;
101 AgentLibraryList Arguments::_agentList;
102
103 abort_hook_t Arguments::_abort_hook = NULL;
104 exit_hook_t Arguments::_exit_hook = NULL;
105 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
106
107
108 SystemProperty *Arguments::_sun_boot_library_path = NULL;
109 SystemProperty *Arguments::_java_library_path = NULL;
110 SystemProperty *Arguments::_java_home = NULL;
111 SystemProperty *Arguments::_java_class_path = NULL;
112 SystemProperty *Arguments::_sun_boot_class_path = NULL;
113
114 char* Arguments::_ext_dirs = NULL;
115
116 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
117 // part of the option string.
118 static bool match_option(const JavaVMOption *option, const char* name,
119 const char** tail) {
120 int len = (int)strlen(name);
121 if (strncmp(option->optionString, name, len) == 0) {
122 *tail = option->optionString + len;
123 return true;
124 } else {
125 return false;
126 }
127 }
128
129 // Check if 'option' matches 'name'. No "tail" is allowed.
130 static bool match_option(const JavaVMOption *option, const char* name) {
131 const char* tail = NULL;
132 bool result = match_option(option, name, &tail);
133 if (tail != NULL && *tail == '\0') {
134 return result;
135 } else {
136 return false;
137 }
138 }
139
140 // Return true if any of the strings in null-terminated array 'names' matches.
141 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
142 // the option must match exactly.
143 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
144 bool tail_allowed) {
145 for (/* empty */; *names != NULL; ++names) {
146 if (match_option(option, *names, tail)) {
147 if (**tail == '\0' || tail_allowed && **tail == ':') {
148 return true;
149 }
150 }
151 }
152 return false;
153 }
154
155 static void logOption(const char* opt) {
156 if (PrintVMOptions) {
157 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
158 }
159 }
160
161 // Process java launcher properties.
162 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
163 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
164 // sun.java.launcher.pid is defined.
165 // Must do this before setting up other system properties,
166 // as some of them may depend on launcher type.
167 for (int index = 0; index < args->nOptions; index++) {
168 const JavaVMOption* option = args->options + index;
169 const char* tail;
170
171 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
172 process_java_launcher_argument(tail, option->extraInfo);
173 continue;
174 }
175 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
176 if (strcmp(tail, "true") == 0) {
177 _sun_java_launcher_is_altjvm = true;
178 }
179 continue;
180 }
181 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
182 _sun_java_launcher_pid = atoi(tail);
183 continue;
184 }
185 }
186 }
187
188 // Initialize system properties key and value.
189 void Arguments::init_system_properties() {
190
191 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
192 "Java Virtual Machine Specification", false));
193 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
194 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
195 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
196
197 // Following are JVMTI agent writable properties.
198 // Properties values are set to NULL and they are
199 // os specific they are initialized in os::init_system_properties_values().
200 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
201 _java_library_path = new SystemProperty("java.library.path", NULL, true);
202 _java_home = new SystemProperty("java.home", NULL, true);
203 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
204
205 _java_class_path = new SystemProperty("java.class.path", "", true);
206
207 // Add to System Property list.
208 PropertyList_add(&_system_properties, _sun_boot_library_path);
209 PropertyList_add(&_system_properties, _java_library_path);
210 PropertyList_add(&_system_properties, _java_home);
211 PropertyList_add(&_system_properties, _java_class_path);
212 PropertyList_add(&_system_properties, _sun_boot_class_path);
213
214 // Set OS specific system properties values
215 os::init_system_properties_values();
216 }
217
218
219 // Update/Initialize System properties after JDK version number is known
220 void Arguments::init_version_specific_system_properties() {
221 enum { bufsz = 16 };
222 char buffer[bufsz];
223 const char* spec_vendor = "Sun Microsystems Inc.";
224 uint32_t spec_version = 0;
225
226 spec_vendor = "Oracle Corporation";
227 spec_version = JDK_Version::current().major_version();
228 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
229
230 PropertyList_add(&_system_properties,
231 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.specification.version", buffer, false));
234 PropertyList_add(&_system_properties,
235 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
236 }
237
238 /**
239 * Provide a slightly more user-friendly way of eliminating -XX flags.
240 * When a flag is eliminated, it can be added to this list in order to
241 * continue accepting this flag on the command-line, while issuing a warning
242 * and ignoring the value. Once the JDK version reaches the 'accept_until'
243 * limit, we flatly refuse to admit the existence of the flag. This allows
244 * a flag to die correctly over JDK releases using HSX.
245 * But now that HSX is no longer supported only options with a future
246 * accept_until value need to be listed, and the list can be pruned
247 * on each major release.
248 */
249 typedef struct {
250 const char* name;
251 JDK_Version obsoleted_in; // when the flag went away
252 JDK_Version accept_until; // which version to start denying the existence
253 } ObsoleteFlag;
254
255 static ObsoleteFlag obsolete_jvm_flags[] = {
256 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
257 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
258 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
259 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
260 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
261 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
262 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
263 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
264 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
265 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
266 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
267 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
268 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
269 #ifndef ZERO
270 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
271 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
272 #endif // ZERO
273 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) },
274 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) },
275 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) },
276 { NULL, JDK_Version(0), JDK_Version(0) }
277 };
278
279 // Returns true if the flag is obsolete and fits into the range specified
280 // for being ignored. In the case that the flag is ignored, the 'version'
281 // value is filled in with the version number when the flag became
282 // obsolete so that that value can be displayed to the user.
283 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
284 int i = 0;
285 assert(version != NULL, "Must provide a version buffer");
286 while (obsolete_jvm_flags[i].name != NULL) {
287 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
288 // <flag>=xxx form
289 // [-|+]<flag> form
290 size_t len = strlen(flag_status.name);
291 if ((strncmp(flag_status.name, s, len) == 0) &&
292 (strlen(s) == len)){
293 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
294 *version = flag_status.obsoleted_in;
295 return true;
296 }
297 }
298 i++;
299 }
300 return false;
301 }
302
303 // Constructs the system class path (aka boot class path) from the following
304 // components, in order:
305 //
306 // prefix // from -Xbootclasspath/p:...
307 // base // from os::get_system_properties() or -Xbootclasspath=
308 // suffix // from -Xbootclasspath/a:...
309 //
310 // This could be AllStatic, but it isn't needed after argument processing is
311 // complete.
312 class SysClassPath: public StackObj {
313 public:
314 SysClassPath(const char* base);
315 ~SysClassPath();
316
317 inline void set_base(const char* base);
318 inline void add_prefix(const char* prefix);
319 inline void add_suffix_to_prefix(const char* suffix);
320 inline void add_suffix(const char* suffix);
321 inline void reset_path(const char* base);
322
323 inline const char* get_base() const { return _items[_scp_base]; }
324 inline const char* get_prefix() const { return _items[_scp_prefix]; }
325 inline const char* get_suffix() const { return _items[_scp_suffix]; }
326
327 // Combine all the components into a single c-heap-allocated string; caller
328 // must free the string if/when no longer needed.
329 char* combined_path();
330
331 private:
332 // Utility routines.
333 static char* add_to_path(const char* path, const char* str, bool prepend);
334 static char* add_jars_to_path(char* path, const char* directory);
335
336 inline void reset_item_at(int index);
337
338 // Array indices for the items that make up the sysclasspath. All except the
339 // base are allocated in the C heap and freed by this class.
340 enum {
341 _scp_prefix, // from -Xbootclasspath/p:...
342 _scp_base, // the default sysclasspath
343 _scp_suffix, // from -Xbootclasspath/a:...
344 _scp_nitems // the number of items, must be last.
345 };
346
347 const char* _items[_scp_nitems];
348 };
349
350 SysClassPath::SysClassPath(const char* base) {
351 memset(_items, 0, sizeof(_items));
352 _items[_scp_base] = base;
353 }
354
355 SysClassPath::~SysClassPath() {
356 // Free everything except the base.
357 for (int i = 0; i < _scp_nitems; ++i) {
358 if (i != _scp_base) reset_item_at(i);
359 }
360 }
361
362 inline void SysClassPath::set_base(const char* base) {
363 _items[_scp_base] = base;
364 }
365
366 inline void SysClassPath::add_prefix(const char* prefix) {
367 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
368 }
369
370 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
371 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
372 }
373
374 inline void SysClassPath::add_suffix(const char* suffix) {
375 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
376 }
377
378 inline void SysClassPath::reset_item_at(int index) {
379 assert(index < _scp_nitems && index != _scp_base, "just checking");
380 if (_items[index] != NULL) {
381 FREE_C_HEAP_ARRAY(char, _items[index]);
382 _items[index] = NULL;
383 }
384 }
385
386 inline void SysClassPath::reset_path(const char* base) {
387 // Clear the prefix and suffix.
388 reset_item_at(_scp_prefix);
389 reset_item_at(_scp_suffix);
390 set_base(base);
391 }
392
393 //------------------------------------------------------------------------------
394
395
396 // Combine the bootclasspath elements, some of which may be null, into a single
397 // c-heap-allocated string.
398 char* SysClassPath::combined_path() {
399 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
400
401 size_t lengths[_scp_nitems];
402 size_t total_len = 0;
403
404 const char separator = *os::path_separator();
405
406 // Get the lengths.
407 int i;
408 for (i = 0; i < _scp_nitems; ++i) {
409 if (_items[i] != NULL) {
410 lengths[i] = strlen(_items[i]);
411 // Include space for the separator char (or a NULL for the last item).
412 total_len += lengths[i] + 1;
413 }
414 }
415 assert(total_len > 0, "empty sysclasspath not allowed");
416
417 // Copy the _items to a single string.
418 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
419 char* cp_tmp = cp;
420 for (i = 0; i < _scp_nitems; ++i) {
421 if (_items[i] != NULL) {
422 memcpy(cp_tmp, _items[i], lengths[i]);
423 cp_tmp += lengths[i];
424 *cp_tmp++ = separator;
425 }
426 }
427 *--cp_tmp = '\0'; // Replace the extra separator.
428 return cp;
429 }
430
431 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
432 char*
433 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
434 char *cp;
435
436 assert(str != NULL, "just checking");
437 if (path == NULL) {
438 size_t len = strlen(str) + 1;
439 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
440 memcpy(cp, str, len); // copy the trailing null
441 } else {
442 const char separator = *os::path_separator();
443 size_t old_len = strlen(path);
444 size_t str_len = strlen(str);
445 size_t len = old_len + str_len + 2;
446
447 if (prepend) {
448 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
449 char* cp_tmp = cp;
450 memcpy(cp_tmp, str, str_len);
451 cp_tmp += str_len;
452 *cp_tmp = separator;
453 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
454 FREE_C_HEAP_ARRAY(char, path);
455 } else {
456 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
457 char* cp_tmp = cp + old_len;
458 *cp_tmp = separator;
459 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
460 }
461 }
462 return cp;
463 }
464
465 // Scan the directory and append any jar or zip files found to path.
466 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
467 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
468 DIR* dir = os::opendir(directory);
469 if (dir == NULL) return path;
470
471 char dir_sep[2] = { '\0', '\0' };
472 size_t directory_len = strlen(directory);
473 const char fileSep = *os::file_separator();
474 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
475
476 /* Scan the directory for jars/zips, appending them to path. */
477 struct dirent *entry;
478 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
479 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
480 const char* name = entry->d_name;
481 const char* ext = name + strlen(name) - 4;
482 bool isJarOrZip = ext > name &&
483 (os::file_name_strcmp(ext, ".jar") == 0 ||
484 os::file_name_strcmp(ext, ".zip") == 0);
485 if (isJarOrZip) {
486 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
487 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
488 path = add_to_path(path, jarpath, false);
489 FREE_C_HEAP_ARRAY(char, jarpath);
490 }
491 }
492 FREE_C_HEAP_ARRAY(char, dbuf);
493 os::closedir(dir);
494 return path;
495 }
496
497 // Parses a memory size specification string.
498 static bool atomull(const char *s, julong* result) {
499 julong n = 0;
500 int args_read = 0;
501 bool is_hex = false;
502 // Skip leading 0[xX] for hexadecimal
503 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
504 s += 2;
505 is_hex = true;
506 args_read = sscanf(s, JULONG_FORMAT_X, &n);
507 } else {
508 args_read = sscanf(s, JULONG_FORMAT, &n);
509 }
510 if (args_read != 1) {
511 return false;
512 }
513 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
514 s++;
515 }
516 // 4705540: illegal if more characters are found after the first non-digit
517 if (strlen(s) > 1) {
518 return false;
519 }
520 switch (*s) {
521 case 'T': case 't':
522 *result = n * G * K;
523 // Check for overflow.
524 if (*result/((julong)G * K) != n) return false;
525 return true;
526 case 'G': case 'g':
527 *result = n * G;
528 if (*result/G != n) return false;
529 return true;
530 case 'M': case 'm':
531 *result = n * M;
532 if (*result/M != n) return false;
533 return true;
534 case 'K': case 'k':
535 *result = n * K;
536 if (*result/K != n) return false;
537 return true;
538 case '\0':
539 *result = n;
540 return true;
541 default:
542 return false;
543 }
544 }
545
546 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
547 if (size < min_size) return arg_too_small;
548 // Check that size will fit in a size_t (only relevant on 32-bit)
549 if (size > max_uintx) return arg_too_big;
550 return arg_in_range;
551 }
552
553 // Describe an argument out of range error
554 void Arguments::describe_range_error(ArgsRange errcode) {
555 switch(errcode) {
556 case arg_too_big:
557 jio_fprintf(defaultStream::error_stream(),
558 "The specified size exceeds the maximum "
559 "representable size.\n");
560 break;
561 case arg_too_small:
562 case arg_unreadable:
563 case arg_in_range:
564 // do nothing for now
565 break;
566 default:
567 ShouldNotReachHere();
568 }
569 }
570
571 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
572 return CommandLineFlags::boolAtPut(name, &value, origin);
573 }
574
575 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
576 double v;
577 if (sscanf(value, "%lf", &v) != 1) {
578 return false;
579 }
580
581 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
582 return true;
583 }
584 return false;
585 }
586
587 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
588 julong v;
589 int int_v;
590 intx intx_v;
591 bool is_neg = false;
592 // Check the sign first since atomull() parses only unsigned values.
593 if (*value == '-') {
594 if (!CommandLineFlags::intxAt(name, &intx_v) && !CommandLineFlags::intAt(name, &int_v)) {
595 return false;
596 }
597 value++;
598 is_neg = true;
599 }
600 if (!atomull(value, &v)) {
601 return false;
602 }
603 int_v = (int) v;
604 if (is_neg) {
605 int_v = -int_v;
606 }
607 if (CommandLineFlags::intAtPut(name, &int_v, origin)) {
608 return true;
609 }
610 uint uint_v = (uint) v;
611 if (!is_neg && CommandLineFlags::uintAtPut(name, &uint_v, origin)) {
612 return true;
613 }
614 intx_v = (intx) v;
615 if (is_neg) {
616 intx_v = -intx_v;
617 }
618 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
619 return true;
620 }
621 uintx uintx_v = (uintx) v;
622 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
623 return true;
624 }
625 uint64_t uint64_t_v = (uint64_t) v;
626 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
627 return true;
628 }
629 size_t size_t_v = (size_t) v;
630 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) {
631 return true;
632 }
633 return false;
634 }
635
636 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
637 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
638 // Contract: CommandLineFlags always returns a pointer that needs freeing.
639 FREE_C_HEAP_ARRAY(char, value);
640 return true;
641 }
642
643 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
644 const char* old_value = "";
645 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
646 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
647 size_t new_len = strlen(new_value);
648 const char* value;
649 char* free_this_too = NULL;
650 if (old_len == 0) {
651 value = new_value;
652 } else if (new_len == 0) {
653 value = old_value;
654 } else {
655 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
656 // each new setting adds another LINE to the switch:
657 sprintf(buf, "%s\n%s", old_value, new_value);
658 value = buf;
659 free_this_too = buf;
660 }
661 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
662 // CommandLineFlags always returns a pointer that needs freeing.
663 FREE_C_HEAP_ARRAY(char, value);
664 if (free_this_too != NULL) {
665 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
666 FREE_C_HEAP_ARRAY(char, free_this_too);
667 }
668 return true;
669 }
670
671 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
672
673 // range of acceptable characters spelled out for portability reasons
674 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
675 #define BUFLEN 255
676 char name[BUFLEN+1];
677 char dummy;
678
679 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
680 return set_bool_flag(name, false, origin);
681 }
682 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
683 return set_bool_flag(name, true, origin);
684 }
685
686 char punct;
687 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
688 const char* value = strchr(arg, '=') + 1;
689 Flag* flag = Flag::find_flag(name, strlen(name));
690 if (flag != NULL && flag->is_ccstr()) {
691 if (flag->ccstr_accumulates()) {
692 return append_to_string_flag(name, value, origin);
693 } else {
694 if (value[0] == '\0') {
695 value = NULL;
696 }
697 return set_string_flag(name, value, origin);
698 }
699 }
700 }
701
702 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
703 const char* value = strchr(arg, '=') + 1;
704 // -XX:Foo:=xxx will reset the string flag to the given value.
705 if (value[0] == '\0') {
706 value = NULL;
707 }
708 return set_string_flag(name, value, origin);
709 }
710
711 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
712 #define SIGNED_NUMBER_RANGE "[-0123456789]"
713 #define NUMBER_RANGE "[0123456789]"
714 char value[BUFLEN + 1];
715 char value2[BUFLEN + 1];
716 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
717 // Looks like a floating-point number -- try again with more lenient format string
718 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
719 return set_fp_numeric_flag(name, value, origin);
720 }
721 }
722
723 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
724 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
725 return set_numeric_flag(name, value, origin);
726 }
727
728 return false;
729 }
730
731 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
732 assert(bldarray != NULL, "illegal argument");
733
734 if (arg == NULL) {
735 return;
736 }
737
738 int new_count = *count + 1;
739
740 // expand the array and add arg to the last element
741 if (*bldarray == NULL) {
742 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
743 } else {
744 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
745 }
746 (*bldarray)[*count] = os::strdup_check_oom(arg);
747 *count = new_count;
748 }
749
750 void Arguments::build_jvm_args(const char* arg) {
751 add_string(&_jvm_args_array, &_num_jvm_args, arg);
752 }
753
754 void Arguments::build_jvm_flags(const char* arg) {
755 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
756 }
757
758 // utility function to return a string that concatenates all
759 // strings in a given char** array
760 const char* Arguments::build_resource_string(char** args, int count) {
761 if (args == NULL || count == 0) {
762 return NULL;
763 }
764 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
765 for (int i = 1; i < count; i++) {
766 length += strlen(args[i]) + 1; // add 1 for a space
767 }
768 char* s = NEW_RESOURCE_ARRAY(char, length);
769 strcpy(s, args[0]);
770 for (int j = 1; j < count; j++) {
771 strcat(s, " ");
772 strcat(s, args[j]);
773 }
774 return (const char*) s;
775 }
776
777 void Arguments::print_on(outputStream* st) {
778 st->print_cr("VM Arguments:");
779 if (num_jvm_flags() > 0) {
780 st->print("jvm_flags: "); print_jvm_flags_on(st);
781 }
782 if (num_jvm_args() > 0) {
783 st->print("jvm_args: "); print_jvm_args_on(st);
784 }
785 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
786 if (_java_class_path != NULL) {
787 char* path = _java_class_path->value();
788 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
789 }
790 st->print_cr("Launcher Type: %s", _sun_java_launcher);
791 }
792
793 void Arguments::print_jvm_flags_on(outputStream* st) {
794 if (_num_jvm_flags > 0) {
795 for (int i=0; i < _num_jvm_flags; i++) {
796 st->print("%s ", _jvm_flags_array[i]);
797 }
798 st->cr();
799 }
800 }
801
802 void Arguments::print_jvm_args_on(outputStream* st) {
803 if (_num_jvm_args > 0) {
804 for (int i=0; i < _num_jvm_args; i++) {
805 st->print("%s ", _jvm_args_array[i]);
806 }
807 st->cr();
808 }
809 }
810
811 bool Arguments::process_argument(const char* arg,
812 jboolean ignore_unrecognized, Flag::Flags origin) {
813
814 JDK_Version since = JDK_Version();
815
816 if (parse_argument(arg, origin) || ignore_unrecognized) {
817 return true;
818 }
819
820 // Determine if the flag has '+', '-', or '=' characters.
821 bool has_plus_minus = (*arg == '+' || *arg == '-');
822 const char* const argname = has_plus_minus ? arg + 1 : arg;
823
824 size_t arg_len;
825 const char* equal_sign = strchr(argname, '=');
826 if (equal_sign == NULL) {
827 arg_len = strlen(argname);
828 } else {
829 arg_len = equal_sign - argname;
830 }
831
832 // Construct a string which consists only of the argument name without '+', '-', or '='.
833 char stripped_argname[256];
834 strncpy(stripped_argname, argname, arg_len);
835 stripped_argname[arg_len] = '\0'; //strncpy doesn't null terminate.
836
837 if (is_newly_obsolete(stripped_argname, &since)) {
838 char version[256];
839 since.to_string(version, sizeof(version));
840 warning("ignoring option %s; support was removed in %s", stripped_argname, version);
841 return true;
842 }
843
844 // For locked flags, report a custom error message if available.
845 // Otherwise, report the standard unrecognized VM option.
846 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
847 if (found_flag != NULL) {
848 char locked_message_buf[BUFLEN];
849 found_flag->get_locked_message(locked_message_buf, BUFLEN);
850 if (strlen(locked_message_buf) == 0) {
851 if (found_flag->is_bool() && !has_plus_minus) {
852 jio_fprintf(defaultStream::error_stream(),
853 "Missing +/- setting for VM option '%s'\n", argname);
854 } else if (!found_flag->is_bool() && has_plus_minus) {
855 jio_fprintf(defaultStream::error_stream(),
856 "Unexpected +/- setting in VM option '%s'\n", argname);
857 } else {
858 jio_fprintf(defaultStream::error_stream(),
859 "Improperly specified VM option '%s'\n", argname);
860 }
861 } else {
862 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
863 }
864 } else {
865 jio_fprintf(defaultStream::error_stream(),
866 "Unrecognized VM option '%s'\n", argname);
867 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
868 if (fuzzy_matched != NULL) {
869 jio_fprintf(defaultStream::error_stream(),
870 "Did you mean '%s%s%s'? ",
871 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
872 fuzzy_matched->_name,
873 (fuzzy_matched->is_bool()) ? "" : "=<value>");
874 }
875 }
876
877 // allow for commandline "commenting out" options like -XX:#+Verbose
878 return arg[0] == '#';
879 }
880
881 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
882 FILE* stream = fopen(file_name, "rb");
883 if (stream == NULL) {
884 if (should_exist) {
885 jio_fprintf(defaultStream::error_stream(),
886 "Could not open settings file %s\n", file_name);
887 return false;
888 } else {
889 return true;
890 }
891 }
892
893 char token[1024];
894 int pos = 0;
895
896 bool in_white_space = true;
897 bool in_comment = false;
898 bool in_quote = false;
899 char quote_c = 0;
900 bool result = true;
901
902 int c = getc(stream);
903 while(c != EOF && pos < (int)(sizeof(token)-1)) {
904 if (in_white_space) {
905 if (in_comment) {
906 if (c == '\n') in_comment = false;
907 } else {
908 if (c == '#') in_comment = true;
909 else if (!isspace(c)) {
910 in_white_space = false;
911 token[pos++] = c;
912 }
913 }
914 } else {
915 if (c == '\n' || (!in_quote && isspace(c))) {
916 // token ends at newline, or at unquoted whitespace
917 // this allows a way to include spaces in string-valued options
918 token[pos] = '\0';
919 logOption(token);
920 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
921 build_jvm_flags(token);
922 pos = 0;
923 in_white_space = true;
924 in_quote = false;
925 } else if (!in_quote && (c == '\'' || c == '"')) {
926 in_quote = true;
927 quote_c = c;
928 } else if (in_quote && (c == quote_c)) {
929 in_quote = false;
930 } else {
931 token[pos++] = c;
932 }
933 }
934 c = getc(stream);
935 }
936 if (pos > 0) {
937 token[pos] = '\0';
938 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
939 build_jvm_flags(token);
940 }
941 fclose(stream);
942 return result;
943 }
944
945 //=============================================================================================================
946 // Parsing of properties (-D)
947
948 const char* Arguments::get_property(const char* key) {
949 return PropertyList_get_value(system_properties(), key);
950 }
951
952 bool Arguments::add_property(const char* prop) {
953 const char* eq = strchr(prop, '=');
954 char* key;
955 // ns must be static--its address may be stored in a SystemProperty object.
956 const static char ns[1] = {0};
957 char* value = (char *)ns;
958
959 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
960 key = AllocateHeap(key_len + 1, mtInternal);
961 strncpy(key, prop, key_len);
962 key[key_len] = '\0';
963
964 if (eq != NULL) {
965 size_t value_len = strlen(prop) - key_len - 1;
966 value = AllocateHeap(value_len + 1, mtInternal);
967 strncpy(value, &prop[key_len + 1], value_len + 1);
968 }
969
970 if (strcmp(key, "java.compiler") == 0) {
971 process_java_compiler_argument(value);
972 FreeHeap(key);
973 if (eq != NULL) {
974 FreeHeap(value);
975 }
976 return true;
977 } else if (strcmp(key, "sun.java.command") == 0) {
978 _java_command = value;
979
980 // Record value in Arguments, but let it get passed to Java.
981 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
982 strcmp(key, "sun.java.launcher.pid") == 0) {
983 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
984 // private and are processed in process_sun_java_launcher_properties();
985 // the sun.java.launcher property is passed on to the java application
986 FreeHeap(key);
987 if (eq != NULL) {
988 FreeHeap(value);
989 }
990 return true;
991 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
992 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
993 // its value without going through the property list or making a Java call.
994 _java_vendor_url_bug = value;
995 } else if (strcmp(key, "sun.boot.library.path") == 0) {
996 PropertyList_unique_add(&_system_properties, key, value, true);
997 return true;
998 }
999 // Create new property and add at the end of the list
1000 PropertyList_unique_add(&_system_properties, key, value);
1001 return true;
1002 }
1003
1004 //===========================================================================================================
1005 // Setting int/mixed/comp mode flags
1006
1007 void Arguments::set_mode_flags(Mode mode) {
1008 // Set up default values for all flags.
1009 // If you add a flag to any of the branches below,
1010 // add a default value for it here.
1011 set_java_compiler(false);
1012 _mode = mode;
1013
1014 // Ensure Agent_OnLoad has the correct initial values.
1015 // This may not be the final mode; mode may change later in onload phase.
1016 PropertyList_unique_add(&_system_properties, "java.vm.info",
1017 (char*)VM_Version::vm_info_string(), false);
1018
1019 UseInterpreter = true;
1020 UseCompiler = true;
1021 UseLoopCounter = true;
1022
1023 // Default values may be platform/compiler dependent -
1024 // use the saved values
1025 ClipInlining = Arguments::_ClipInlining;
1026 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1027 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1028 BackgroundCompilation = Arguments::_BackgroundCompilation;
1029 if (TieredCompilation) {
1030 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1031 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1032 }
1033 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1034 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1035 }
1036 }
1037
1038 // Change from defaults based on mode
1039 switch (mode) {
1040 default:
1041 ShouldNotReachHere();
1042 break;
1043 case _int:
1044 UseCompiler = false;
1045 UseLoopCounter = false;
1046 AlwaysCompileLoopMethods = false;
1047 UseOnStackReplacement = false;
1048 break;
1049 case _mixed:
1050 // same as default
1051 break;
1052 case _comp:
1053 UseInterpreter = false;
1054 BackgroundCompilation = false;
1055 ClipInlining = false;
1056 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1057 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1058 // compile a level 4 (C2) and then continue executing it.
1059 if (TieredCompilation) {
1060 Tier3InvokeNotifyFreqLog = 0;
1061 Tier4InvocationThreshold = 0;
1062 }
1063 break;
1064 }
1065 }
1066
1067 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1068 // Conflict: required to use shared spaces (-Xshare:on), but
1069 // incompatible command line options were chosen.
1070
1071 static void no_shared_spaces(const char* message) {
1072 if (RequireSharedSpaces) {
1073 jio_fprintf(defaultStream::error_stream(),
1074 "Class data sharing is inconsistent with other specified options.\n");
1075 vm_exit_during_initialization("Unable to use shared archive.", message);
1076 } else {
1077 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1078 }
1079 }
1080 #endif
1081
1082 // Returns threshold scaled with the value of scale.
1083 // If scale < 0.0, threshold is returned without scaling.
1084 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1085 if (scale == 1.0 || scale < 0.0) {
1086 return threshold;
1087 } else {
1088 return (intx)(threshold * scale);
1089 }
1090 }
1091
1092 // Returns freq_log scaled with the value of scale.
1093 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1094 // If scale < 0.0, freq_log is returned without scaling.
1095 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1096 // Check if scaling is necessary or if negative value was specified.
1097 if (scale == 1.0 || scale < 0.0) {
1098 return freq_log;
1099 }
1100 // Check values to avoid calculating log2 of 0.
1101 if (scale == 0.0 || freq_log == 0) {
1102 return 0;
1103 }
1104 // Determine the maximum notification frequency value currently supported.
1105 // The largest mask value that the interpreter/C1 can handle is
1106 // of length InvocationCounter::number_of_count_bits. Mask values are always
1107 // one bit shorter then the value of the notification frequency. Set
1108 // max_freq_bits accordingly.
1109 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1110 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1111 if (scaled_freq == 0) {
1112 // Return 0 right away to avoid calculating log2 of 0.
1113 return 0;
1114 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1115 return max_freq_bits;
1116 } else {
1117 return log2_intptr(scaled_freq);
1118 }
1119 }
1120
1121 void Arguments::set_tiered_flags() {
1122 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1123 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1124 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1125 }
1126 if (CompilationPolicyChoice < 2) {
1127 vm_exit_during_initialization(
1128 "Incompatible compilation policy selected", NULL);
1129 }
1130 // Increase the code cache size - tiered compiles a lot more.
1131 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1132 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1133 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1134 }
1135 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1136 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1137 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1138
1139 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1140 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1141 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1142 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1143 }
1144 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1145 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1146 }
1147 // Check consistency of code heap sizes
1148 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1149 jio_fprintf(defaultStream::error_stream(),
1150 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1151 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1152 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1153 vm_exit(1);
1154 }
1155 }
1156 }
1157 if (!UseInterpreter) { // -Xcomp
1158 Tier3InvokeNotifyFreqLog = 0;
1159 Tier4InvocationThreshold = 0;
1160 }
1161
1162 if (CompileThresholdScaling < 0) {
1163 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1164 }
1165
1166 // Scale tiered compilation thresholds.
1167 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1168 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1169 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1170 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1171
1172 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1173 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1174 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1175 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1176
1177 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1178 // once these thresholds become supported.
1179
1180 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1181 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1182
1183 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1184 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1185
1186 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1187
1188 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1189 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1190 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1191 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1192 }
1193 }
1194
1195 /**
1196 * Returns the minimum number of compiler threads needed to run the JVM. The following
1197 * configurations are possible.
1198 *
1199 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1200 * compiler threads is 0.
1201 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1202 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1203 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1204 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1205 * C1 can be used, so the minimum number of compiler threads is 1.
1206 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1207 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1208 * the minimum number of compiler threads is 2.
1209 */
1210 int Arguments::get_min_number_of_compiler_threads() {
1211 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1212 return 0; // case 1
1213 #else
1214 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1215 return 1; // case 2 or case 3
1216 }
1217 return 2; // case 4 (tiered)
1218 #endif
1219 }
1220
1221 #if INCLUDE_ALL_GCS
1222 static void disable_adaptive_size_policy(const char* collector_name) {
1223 if (UseAdaptiveSizePolicy) {
1224 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1225 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1226 collector_name);
1227 }
1228 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1229 }
1230 }
1231
1232 void Arguments::set_parnew_gc_flags() {
1233 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1234 "control point invariant");
1235 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1236 assert(UseParNewGC, "ParNew should always be used with CMS");
1237
1238 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1239 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1240 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1241 } else if (ParallelGCThreads == 0) {
1242 jio_fprintf(defaultStream::error_stream(),
1243 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1244 vm_exit(1);
1245 }
1246
1247 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1248 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1249 // we set them to 1024 and 1024.
1250 // See CR 6362902.
1251 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1252 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1253 }
1254 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1255 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1256 }
1257
1258 // When using compressed oops, we use local overflow stacks,
1259 // rather than using a global overflow list chained through
1260 // the klass word of the object's pre-image.
1261 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1262 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1263 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1264 }
1265 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1266 }
1267 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1268 }
1269
1270 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1271 // sparc/solaris for certain applications, but would gain from
1272 // further optimization and tuning efforts, and would almost
1273 // certainly gain from analysis of platform and environment.
1274 void Arguments::set_cms_and_parnew_gc_flags() {
1275 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1276 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1277 assert(UseParNewGC, "ParNew should always be used with CMS");
1278
1279 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1280 disable_adaptive_size_policy("UseConcMarkSweepGC");
1281
1282 set_parnew_gc_flags();
1283
1284 size_t max_heap = align_size_down(MaxHeapSize,
1285 CardTableRS::ct_max_alignment_constraint());
1286
1287 // Now make adjustments for CMS
1288 intx tenuring_default = (intx)6;
1289 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1290
1291 // Preferred young gen size for "short" pauses:
1292 // upper bound depends on # of threads and NewRatio.
1293 const size_t preferred_max_new_size_unaligned =
1294 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1295 size_t preferred_max_new_size =
1296 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1297
1298 // Unless explicitly requested otherwise, size young gen
1299 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1300
1301 // If either MaxNewSize or NewRatio is set on the command line,
1302 // assume the user is trying to set the size of the young gen.
1303 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1304
1305 // Set MaxNewSize to our calculated preferred_max_new_size unless
1306 // NewSize was set on the command line and it is larger than
1307 // preferred_max_new_size.
1308 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1309 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1310 } else {
1311 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1312 }
1313 if (PrintGCDetails && Verbose) {
1314 // Too early to use gclog_or_tty
1315 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1316 }
1317
1318 // Code along this path potentially sets NewSize and OldSize
1319 if (PrintGCDetails && Verbose) {
1320 // Too early to use gclog_or_tty
1321 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1322 " initial_heap_size: " SIZE_FORMAT
1323 " max_heap: " SIZE_FORMAT,
1324 min_heap_size(), InitialHeapSize, max_heap);
1325 }
1326 size_t min_new = preferred_max_new_size;
1327 if (FLAG_IS_CMDLINE(NewSize)) {
1328 min_new = NewSize;
1329 }
1330 if (max_heap > min_new && min_heap_size() > min_new) {
1331 // Unless explicitly requested otherwise, make young gen
1332 // at least min_new, and at most preferred_max_new_size.
1333 if (FLAG_IS_DEFAULT(NewSize)) {
1334 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1335 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1336 if (PrintGCDetails && Verbose) {
1337 // Too early to use gclog_or_tty
1338 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1339 }
1340 }
1341 // Unless explicitly requested otherwise, size old gen
1342 // so it's NewRatio x of NewSize.
1343 if (FLAG_IS_DEFAULT(OldSize)) {
1344 if (max_heap > NewSize) {
1345 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1346 if (PrintGCDetails && Verbose) {
1347 // Too early to use gclog_or_tty
1348 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1349 }
1350 }
1351 }
1352 }
1353 }
1354 // Unless explicitly requested otherwise, definitely
1355 // promote all objects surviving "tenuring_default" scavenges.
1356 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1357 FLAG_IS_DEFAULT(SurvivorRatio)) {
1358 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1359 }
1360 // If we decided above (or user explicitly requested)
1361 // `promote all' (via MaxTenuringThreshold := 0),
1362 // prefer minuscule survivor spaces so as not to waste
1363 // space for (non-existent) survivors
1364 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1365 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1366 }
1367
1368 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1369 // but rather the number of free blocks of a given size that are used when
1370 // replenishing the local per-worker free list caches.
1371 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1372 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1373 // OldPLAB sizing manually turned off: Use a larger default setting,
1374 // unless it was manually specified. This is because a too-low value
1375 // will slow down scavenges.
1376 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1377 } else {
1378 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1379 }
1380 }
1381
1382 // If either of the static initialization defaults have changed, note this
1383 // modification.
1384 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1385 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1386 }
1387 if (PrintGCDetails && Verbose) {
1388 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1389 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1390 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1391 }
1392 }
1393 #endif // INCLUDE_ALL_GCS
1394
1395 void set_object_alignment() {
1396 // Object alignment.
1397 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1398 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1399 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1400 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1401 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1402 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1403
1404 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1405 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1406
1407 // Oop encoding heap max
1408 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1409
1410 #if INCLUDE_ALL_GCS
1411 // Set CMS global values
1412 CompactibleFreeListSpace::set_cms_values();
1413 #endif // INCLUDE_ALL_GCS
1414 }
1415
1416 bool verify_object_alignment() {
1417 // Object alignment.
1418 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1419 jio_fprintf(defaultStream::error_stream(),
1420 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1421 (int)ObjectAlignmentInBytes);
1422 return false;
1423 }
1424 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1425 jio_fprintf(defaultStream::error_stream(),
1426 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1427 (int)ObjectAlignmentInBytes, BytesPerLong);
1428 return false;
1429 }
1430 // It does not make sense to have big object alignment
1431 // since a space lost due to alignment will be greater
1432 // then a saved space from compressed oops.
1433 if ((int)ObjectAlignmentInBytes > 256) {
1434 jio_fprintf(defaultStream::error_stream(),
1435 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1436 (int)ObjectAlignmentInBytes);
1437 return false;
1438 }
1439 // In case page size is very small.
1440 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1441 jio_fprintf(defaultStream::error_stream(),
1442 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1443 (int)ObjectAlignmentInBytes, os::vm_page_size());
1444 return false;
1445 }
1446 if(SurvivorAlignmentInBytes == 0) {
1447 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1448 } else {
1449 if (!is_power_of_2(SurvivorAlignmentInBytes)) {
1450 jio_fprintf(defaultStream::error_stream(),
1451 "error: SurvivorAlignmentInBytes=%d must be power of 2\n",
1452 (int)SurvivorAlignmentInBytes);
1453 return false;
1454 }
1455 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) {
1456 jio_fprintf(defaultStream::error_stream(),
1457 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n",
1458 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes);
1459 return false;
1460 }
1461 }
1462 return true;
1463 }
1464
1465 size_t Arguments::max_heap_for_compressed_oops() {
1466 // Avoid sign flip.
1467 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1468 // We need to fit both the NULL page and the heap into the memory budget, while
1469 // keeping alignment constraints of the heap. To guarantee the latter, as the
1470 // NULL page is located before the heap, we pad the NULL page to the conservative
1471 // maximum alignment that the GC may ever impose upon the heap.
1472 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1473 _conservative_max_heap_alignment);
1474
1475 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1476 NOT_LP64(ShouldNotReachHere(); return 0);
1477 }
1478
1479 bool Arguments::should_auto_select_low_pause_collector() {
1480 if (UseAutoGCSelectPolicy &&
1481 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1482 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1483 if (PrintGCDetails) {
1484 // Cannot use gclog_or_tty yet.
1485 tty->print_cr("Automatic selection of the low pause collector"
1486 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1487 }
1488 return true;
1489 }
1490 return false;
1491 }
1492
1493 void Arguments::set_use_compressed_oops() {
1494 #ifndef ZERO
1495 #ifdef _LP64
1496 // MaxHeapSize is not set up properly at this point, but
1497 // the only value that can override MaxHeapSize if we are
1498 // to use UseCompressedOops is InitialHeapSize.
1499 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1500
1501 if (max_heap_size <= max_heap_for_compressed_oops()) {
1502 #if !defined(COMPILER1) || defined(TIERED)
1503 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1504 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1505 }
1506 #endif
1507 } else {
1508 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1509 warning("Max heap size too large for Compressed Oops");
1510 FLAG_SET_DEFAULT(UseCompressedOops, false);
1511 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1512 }
1513 }
1514 #endif // _LP64
1515 #endif // ZERO
1516 }
1517
1518
1519 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1520 // set_use_compressed_oops().
1521 void Arguments::set_use_compressed_klass_ptrs() {
1522 #ifndef ZERO
1523 #ifdef _LP64
1524 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1525 if (!UseCompressedOops) {
1526 if (UseCompressedClassPointers) {
1527 warning("UseCompressedClassPointers requires UseCompressedOops");
1528 }
1529 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1530 } else {
1531 // Turn on UseCompressedClassPointers too
1532 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1533 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1534 }
1535 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1536 if (UseCompressedClassPointers) {
1537 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1538 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1539 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1540 }
1541 }
1542 }
1543 #endif // _LP64
1544 #endif // !ZERO
1545 }
1546
1547 void Arguments::set_conservative_max_heap_alignment() {
1548 // The conservative maximum required alignment for the heap is the maximum of
1549 // the alignments imposed by several sources: any requirements from the heap
1550 // itself, the collector policy and the maximum page size we may run the VM
1551 // with.
1552 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1553 #if INCLUDE_ALL_GCS
1554 if (UseParallelGC) {
1555 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1556 } else if (UseG1GC) {
1557 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1558 }
1559 #endif // INCLUDE_ALL_GCS
1560 _conservative_max_heap_alignment = MAX4(heap_alignment,
1561 (size_t)os::vm_allocation_granularity(),
1562 os::max_page_size(),
1563 CollectorPolicy::compute_heap_alignment());
1564 }
1565
1566 void Arguments::select_gc_ergonomically() {
1567 if (os::is_server_class_machine()) {
1568 if (should_auto_select_low_pause_collector()) {
1569 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1570 } else {
1571 #if !defined(JAVASE_EMBEDDED)
1572 // Select G1 for non-embedded builds only.
1573 FLAG_SET_ERGO(bool, UseG1GC, true);
1574 #else
1575 FLAG_SET_ERGO(bool, UseParallelGC, true);
1576 #endif
1577 }
1578 } else {
1579 FLAG_SET_ERGO(bool, UseSerialGC, true);
1580 }
1581 }
1582
1583 void Arguments::select_gc() {
1584 if (!gc_selected()) {
1585 select_gc_ergonomically();
1586 guarantee(gc_selected(), "No GC selected");
1587 }
1588 }
1589
1590 void Arguments::set_ergonomics_flags() {
1591 select_gc();
1592
1593 #ifdef COMPILER2
1594 // Shared spaces work fine with other GCs but causes bytecode rewriting
1595 // to be disabled, which hurts interpreter performance and decreases
1596 // server performance. When -server is specified, keep the default off
1597 // unless it is asked for. Future work: either add bytecode rewriting
1598 // at link time, or rewrite bytecodes in non-shared methods.
1599 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1600 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1601 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1602 }
1603 #endif
1604
1605 set_conservative_max_heap_alignment();
1606
1607 #ifndef ZERO
1608 #ifdef _LP64
1609 set_use_compressed_oops();
1610
1611 // set_use_compressed_klass_ptrs() must be called after calling
1612 // set_use_compressed_oops().
1613 set_use_compressed_klass_ptrs();
1614
1615 // Also checks that certain machines are slower with compressed oops
1616 // in vm_version initialization code.
1617 #endif // _LP64
1618 #endif // !ZERO
1619 }
1620
1621 void Arguments::set_parallel_gc_flags() {
1622 assert(UseParallelGC || UseParallelOldGC, "Error");
1623 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1624 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1625 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1626 }
1627 FLAG_SET_DEFAULT(UseParallelGC, true);
1628
1629 // If no heap maximum was requested explicitly, use some reasonable fraction
1630 // of the physical memory, up to a maximum of 1GB.
1631 FLAG_SET_DEFAULT(ParallelGCThreads,
1632 Abstract_VM_Version::parallel_worker_threads());
1633 if (ParallelGCThreads == 0) {
1634 jio_fprintf(defaultStream::error_stream(),
1635 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1636 vm_exit(1);
1637 }
1638
1639 if (UseAdaptiveSizePolicy) {
1640 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1641 // unless the user actually sets these flags.
1642 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1643 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1644 _min_heap_free_ratio = MinHeapFreeRatio;
1645 }
1646 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1647 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1648 _max_heap_free_ratio = MaxHeapFreeRatio;
1649 }
1650 }
1651
1652 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1653 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1654 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1655 // See CR 6362902 for details.
1656 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1657 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1658 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1659 }
1660 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1661 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1662 }
1663 }
1664
1665 if (UseParallelOldGC) {
1666 // Par compact uses lower default values since they are treated as
1667 // minimums. These are different defaults because of the different
1668 // interpretation and are not ergonomically set.
1669 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1670 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1671 }
1672 }
1673 }
1674
1675 void Arguments::set_g1_gc_flags() {
1676 assert(UseG1GC, "Error");
1677 #ifdef COMPILER1
1678 FastTLABRefill = false;
1679 #endif
1680 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1681 if (ParallelGCThreads == 0) {
1682 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1683 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1684 }
1685
1686 #if INCLUDE_ALL_GCS
1687 if (G1ConcRefinementThreads == 0) {
1688 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1689 }
1690 #endif
1691
1692 // MarkStackSize will be set (if it hasn't been set by the user)
1693 // when concurrent marking is initialized.
1694 // Its value will be based upon the number of parallel marking threads.
1695 // But we do set the maximum mark stack size here.
1696 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1697 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1698 }
1699
1700 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1701 // In G1, we want the default GC overhead goal to be higher than
1702 // say in PS. So we set it here to 10%. Otherwise the heap might
1703 // be expanded more aggressively than we would like it to. In
1704 // fact, even 10% seems to not be high enough in some cases
1705 // (especially small GC stress tests that the main thing they do
1706 // is allocation). We might consider increase it further.
1707 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1708 }
1709
1710 if (PrintGCDetails && Verbose) {
1711 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1712 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1713 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1714 }
1715 }
1716
1717 #if !INCLUDE_ALL_GCS
1718 #ifdef ASSERT
1719 static bool verify_serial_gc_flags() {
1720 return (UseSerialGC &&
1721 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1722 UseParallelGC || UseParallelOldGC));
1723 }
1724 #endif // ASSERT
1725 #endif // INCLUDE_ALL_GCS
1726
1727 void Arguments::set_gc_specific_flags() {
1728 #if INCLUDE_ALL_GCS
1729 // Set per-collector flags
1730 if (UseParallelGC || UseParallelOldGC) {
1731 set_parallel_gc_flags();
1732 } else if (UseConcMarkSweepGC) {
1733 set_cms_and_parnew_gc_flags();
1734 } else if (UseG1GC) {
1735 set_g1_gc_flags();
1736 }
1737 check_deprecated_gc_flags();
1738 if (AssumeMP && !UseSerialGC) {
1739 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1740 warning("If the number of processors is expected to increase from one, then"
1741 " you should configure the number of parallel GC threads appropriately"
1742 " using -XX:ParallelGCThreads=N");
1743 }
1744 }
1745 if (MinHeapFreeRatio == 100) {
1746 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1747 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1748 }
1749 #else // INCLUDE_ALL_GCS
1750 assert(verify_serial_gc_flags(), "SerialGC unset");
1751 #endif // INCLUDE_ALL_GCS
1752 }
1753
1754 julong Arguments::limit_by_allocatable_memory(julong limit) {
1755 julong max_allocatable;
1756 julong result = limit;
1757 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1758 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1759 }
1760 return result;
1761 }
1762
1763 // Use static initialization to get the default before parsing
1764 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1765
1766 void Arguments::set_heap_size() {
1767 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1768 // Deprecated flag
1769 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1770 }
1771
1772 const julong phys_mem =
1773 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1774 : (julong)MaxRAM;
1775
1776 // If the maximum heap size has not been set with -Xmx,
1777 // then set it as fraction of the size of physical memory,
1778 // respecting the maximum and minimum sizes of the heap.
1779 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1780 julong reasonable_max = phys_mem / MaxRAMFraction;
1781
1782 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1783 // Small physical memory, so use a minimum fraction of it for the heap
1784 reasonable_max = phys_mem / MinRAMFraction;
1785 } else {
1786 // Not-small physical memory, so require a heap at least
1787 // as large as MaxHeapSize
1788 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1789 }
1790 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1791 // Limit the heap size to ErgoHeapSizeLimit
1792 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1793 }
1794 if (UseCompressedOops) {
1795 // Limit the heap size to the maximum possible when using compressed oops
1796 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1797
1798 // HeapBaseMinAddress can be greater than default but not less than.
1799 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1800 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1801 // matches compressed oops printing flags
1802 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1803 jio_fprintf(defaultStream::error_stream(),
1804 "HeapBaseMinAddress must be at least " SIZE_FORMAT
1805 " (" SIZE_FORMAT "G) which is greater than value given "
1806 SIZE_FORMAT "\n",
1807 DefaultHeapBaseMinAddress,
1808 DefaultHeapBaseMinAddress/G,
1809 HeapBaseMinAddress);
1810 }
1811 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1812 }
1813 }
1814
1815 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1816 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1817 // but it should be not less than default MaxHeapSize.
1818 max_coop_heap -= HeapBaseMinAddress;
1819 }
1820 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1821 }
1822 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1823
1824 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1825 // An initial heap size was specified on the command line,
1826 // so be sure that the maximum size is consistent. Done
1827 // after call to limit_by_allocatable_memory because that
1828 // method might reduce the allocation size.
1829 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1830 }
1831
1832 if (PrintGCDetails && Verbose) {
1833 // Cannot use gclog_or_tty yet.
1834 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1835 }
1836 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1837 }
1838
1839 // If the minimum or initial heap_size have not been set or requested to be set
1840 // ergonomically, set them accordingly.
1841 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1842 julong reasonable_minimum = (julong)(OldSize + NewSize);
1843
1844 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1845
1846 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1847
1848 if (InitialHeapSize == 0) {
1849 julong reasonable_initial = phys_mem / InitialRAMFraction;
1850
1851 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1852 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1853
1854 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1855
1856 if (PrintGCDetails && Verbose) {
1857 // Cannot use gclog_or_tty yet.
1858 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1859 }
1860 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1861 }
1862 // If the minimum heap size has not been set (via -Xms),
1863 // synchronize with InitialHeapSize to avoid errors with the default value.
1864 if (min_heap_size() == 0) {
1865 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1866 if (PrintGCDetails && Verbose) {
1867 // Cannot use gclog_or_tty yet.
1868 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1869 }
1870 }
1871 }
1872 }
1873
1874 // This must be called after ergonomics.
1875 void Arguments::set_bytecode_flags() {
1876 if (!RewriteBytecodes) {
1877 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1878 }
1879 }
1880
1881 // Aggressive optimization flags -XX:+AggressiveOpts
1882 void Arguments::set_aggressive_opts_flags() {
1883 #ifdef COMPILER2
1884 if (AggressiveUnboxing) {
1885 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1886 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1887 } else if (!EliminateAutoBox) {
1888 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1889 AggressiveUnboxing = false;
1890 }
1891 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1892 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1893 } else if (!DoEscapeAnalysis) {
1894 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1895 AggressiveUnboxing = false;
1896 }
1897 }
1898 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1899 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1900 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1901 }
1902 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1903 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1904 }
1905
1906 // Feed the cache size setting into the JDK
1907 char buffer[1024];
1908 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1909 add_property(buffer);
1910 }
1911 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1912 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1913 }
1914 #endif
1915
1916 if (AggressiveOpts) {
1917 // Sample flag setting code
1918 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1919 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1920 // }
1921 }
1922 }
1923
1924 //===========================================================================================================
1925 // Parsing of java.compiler property
1926
1927 void Arguments::process_java_compiler_argument(char* arg) {
1928 // For backwards compatibility, Djava.compiler=NONE or ""
1929 // causes us to switch to -Xint mode UNLESS -Xdebug
1930 // is also specified.
1931 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1932 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1933 }
1934 }
1935
1936 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1937 _sun_java_launcher = os::strdup_check_oom(launcher);
1938 }
1939
1940 bool Arguments::created_by_java_launcher() {
1941 assert(_sun_java_launcher != NULL, "property must have value");
1942 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1943 }
1944
1945 bool Arguments::sun_java_launcher_is_altjvm() {
1946 return _sun_java_launcher_is_altjvm;
1947 }
1948
1949 //===========================================================================================================
1950 // Parsing of main arguments
1951
1952 bool Arguments::verify_interval(uintx val, uintx min,
1953 uintx max, const char* name) {
1954 // Returns true iff value is in the inclusive interval [min..max]
1955 // false, otherwise.
1956 if (val >= min && val <= max) {
1957 return true;
1958 }
1959 jio_fprintf(defaultStream::error_stream(),
1960 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1961 " and " UINTX_FORMAT "\n",
1962 name, val, min, max);
1963 return false;
1964 }
1965
1966 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1967 // Returns true if given value is at least specified min threshold
1968 // false, otherwise.
1969 if (val >= min ) {
1970 return true;
1971 }
1972 jio_fprintf(defaultStream::error_stream(),
1973 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1974 name, val, min);
1975 return false;
1976 }
1977
1978 bool Arguments::verify_percentage(uintx value, const char* name) {
1979 if (is_percentage(value)) {
1980 return true;
1981 }
1982 jio_fprintf(defaultStream::error_stream(),
1983 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1984 name, value);
1985 return false;
1986 }
1987
1988 // check if do gclog rotation
1989 // +UseGCLogFileRotation is a must,
1990 // no gc log rotation when log file not supplied or
1991 // NumberOfGCLogFiles is 0
1992 void check_gclog_consistency() {
1993 if (UseGCLogFileRotation) {
1994 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1995 jio_fprintf(defaultStream::output_stream(),
1996 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1997 "where num_of_file > 0\n"
1998 "GC log rotation is turned off\n");
1999 UseGCLogFileRotation = false;
2000 }
2001 }
2002
2003 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2004 FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K);
2005 jio_fprintf(defaultStream::output_stream(),
2006 "GCLogFileSize changed to minimum 8K\n");
2007 }
2008 }
2009
2010 // This function is called for -Xloggc:<filename>, it can be used
2011 // to check if a given file name(or string) conforms to the following
2012 // specification:
2013 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2014 // %p and %t only allowed once. We only limit usage of filename not path
2015 bool is_filename_valid(const char *file_name) {
2016 const char* p = file_name;
2017 char file_sep = os::file_separator()[0];
2018 const char* cp;
2019 // skip prefix path
2020 for (cp = file_name; *cp != '\0'; cp++) {
2021 if (*cp == '/' || *cp == file_sep) {
2022 p = cp + 1;
2023 }
2024 }
2025
2026 int count_p = 0;
2027 int count_t = 0;
2028 while (*p != '\0') {
2029 if ((*p >= '0' && *p <= '9') ||
2030 (*p >= 'A' && *p <= 'Z') ||
2031 (*p >= 'a' && *p <= 'z') ||
2032 *p == '-' ||
2033 *p == '_' ||
2034 *p == '.') {
2035 p++;
2036 continue;
2037 }
2038 if (*p == '%') {
2039 if(*(p + 1) == 'p') {
2040 p += 2;
2041 count_p ++;
2042 continue;
2043 }
2044 if (*(p + 1) == 't') {
2045 p += 2;
2046 count_t ++;
2047 continue;
2048 }
2049 }
2050 return false;
2051 }
2052 return count_p < 2 && count_t < 2;
2053 }
2054
2055 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) {
2056 if (!is_percentage(min_heap_free_ratio)) {
2057 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100");
2058 return false;
2059 }
2060 if (min_heap_free_ratio > MaxHeapFreeRatio) {
2061 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
2062 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio,
2063 MaxHeapFreeRatio);
2064 return false;
2065 }
2066 // This does not set the flag itself, but stores the value in a safe place for later usage.
2067 _min_heap_free_ratio = min_heap_free_ratio;
2068 return true;
2069 }
2070
2071 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) {
2072 if (!is_percentage(max_heap_free_ratio)) {
2073 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100");
2074 return false;
2075 }
2076 if (max_heap_free_ratio < MinHeapFreeRatio) {
2077 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or "
2078 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio,
2079 MinHeapFreeRatio);
2080 return false;
2081 }
2082 // This does not set the flag itself, but stores the value in a safe place for later usage.
2083 _max_heap_free_ratio = max_heap_free_ratio;
2084 return true;
2085 }
2086
2087 // Check consistency of GC selection
2088 bool Arguments::check_gc_consistency() {
2089 check_gclog_consistency();
2090 // Ensure that the user has not selected conflicting sets
2091 // of collectors.
2092 uint i = 0;
2093 if (UseSerialGC) i++;
2094 if (UseConcMarkSweepGC) i++;
2095 if (UseParallelGC || UseParallelOldGC) i++;
2096 if (UseG1GC) i++;
2097 if (i > 1) {
2098 jio_fprintf(defaultStream::error_stream(),
2099 "Conflicting collector combinations in option list; "
2100 "please refer to the release notes for the combinations "
2101 "allowed\n");
2102 return false;
2103 }
2104
2105 if (UseConcMarkSweepGC && !UseParNewGC) {
2106 jio_fprintf(defaultStream::error_stream(),
2107 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2108 return false;
2109 }
2110
2111 if (UseParNewGC && !UseConcMarkSweepGC) {
2112 jio_fprintf(defaultStream::error_stream(),
2113 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2114 return false;
2115 }
2116
2117 return true;
2118 }
2119
2120 void Arguments::check_deprecated_gc_flags() {
2121 if (FLAG_IS_CMDLINE(UseParNewGC)) {
2122 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2123 }
2124 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2125 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2126 "and will likely be removed in future release");
2127 }
2128 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2129 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2130 "Use MaxRAMFraction instead.");
2131 }
2132 }
2133
2134 // Check stack pages settings
2135 bool Arguments::check_stack_pages()
2136 {
2137 bool status = true;
2138 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
2139 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
2140 // greater stack shadow pages can't generate instruction to bang stack
2141 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
2142 return status;
2143 }
2144
2145 // Check the consistency of vm_init_args
2146 bool Arguments::check_vm_args_consistency() {
2147 // Method for adding checks for flag consistency.
2148 // The intent is to warn the user of all possible conflicts,
2149 // before returning an error.
2150 // Note: Needs platform-dependent factoring.
2151 bool status = true;
2152
2153 if (TLABRefillWasteFraction == 0) {
2154 jio_fprintf(defaultStream::error_stream(),
2155 "TLABRefillWasteFraction should be a denominator, "
2156 "not " SIZE_FORMAT "\n",
2157 TLABRefillWasteFraction);
2158 status = false;
2159 }
2160
2161 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
2162 "AdaptiveSizePolicyWeight");
2163 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
2164
2165 // Divide by bucket size to prevent a large size from causing rollover when
2166 // calculating amount of memory needed to be allocated for the String table.
2167 status = status && verify_interval(StringTableSize, minimumStringTableSize,
2168 (max_uintx / StringTable::bucket_size()), "StringTable size");
2169
2170 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize,
2171 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size");
2172
2173 {
2174 // Using "else if" below to avoid printing two error messages if min > max.
2175 // This will also prevent us from reporting both min>100 and max>100 at the
2176 // same time, but that is less annoying than printing two identical errors IMHO.
2177 FormatBuffer<80> err_msg("%s","");
2178 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) {
2179 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2180 status = false;
2181 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) {
2182 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer());
2183 status = false;
2184 }
2185 }
2186
2187 // Min/MaxMetaspaceFreeRatio
2188 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
2189 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
2190
2191 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
2192 jio_fprintf(defaultStream::error_stream(),
2193 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
2194 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
2195 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
2196 MinMetaspaceFreeRatio,
2197 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2198 MaxMetaspaceFreeRatio);
2199 status = false;
2200 }
2201
2202 // Trying to keep 100% free is not practical
2203 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2204
2205 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2206 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2207 }
2208
2209 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2210 // Settings to encourage splitting.
2211 if (!FLAG_IS_CMDLINE(NewRatio)) {
2212 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2213 }
2214 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2215 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2216 }
2217 }
2218
2219 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2220 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2221 }
2222
2223 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2224 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2225 if (GCTimeLimit == 100) {
2226 // Turn off gc-overhead-limit-exceeded checks
2227 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2228 }
2229
2230 status = status && check_gc_consistency();
2231 status = status && check_stack_pages();
2232
2233 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2234 "CMSIncrementalSafetyFactor");
2235
2236 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2237 // insists that we hold the requisite locks so that the iteration is
2238 // MT-safe. For the verification at start-up and shut-down, we don't
2239 // yet have a good way of acquiring and releasing these locks,
2240 // which are not visible at the CollectedHeap level. We want to
2241 // be able to acquire these locks and then do the iteration rather
2242 // than just disable the lock verification. This will be fixed under
2243 // bug 4788986.
2244 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2245 if (VerifyDuringStartup) {
2246 warning("Heap verification at start-up disabled "
2247 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2248 VerifyDuringStartup = false; // Disable verification at start-up
2249 }
2250
2251 if (VerifyBeforeExit) {
2252 warning("Heap verification at shutdown disabled "
2253 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2254 VerifyBeforeExit = false; // Disable verification at shutdown
2255 }
2256 }
2257
2258 // Note: only executed in non-PRODUCT mode
2259 if (!UseAsyncConcMarkSweepGC &&
2260 (ExplicitGCInvokesConcurrent ||
2261 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2262 jio_fprintf(defaultStream::error_stream(),
2263 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2264 " with -UseAsyncConcMarkSweepGC");
2265 status = false;
2266 }
2267
2268 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2269
2270 #if INCLUDE_ALL_GCS
2271 if (UseG1GC) {
2272 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent");
2273 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent");
2274 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent");
2275
2276 status = status && verify_percentage(G1ConfidencePercent, "G1ConfidencePercent");
2277 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2278 "InitiatingHeapOccupancyPercent");
2279 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2280 "G1RefProcDrainInterval");
2281 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2282 "G1ConcMarkStepDurationMillis");
2283 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2284 "G1ConcRSHotCardLimit");
2285 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27,
2286 "G1ConcRSLogCacheSize");
2287 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age,
2288 "StringDeduplicationAgeThreshold");
2289 }
2290 if (UseConcMarkSweepGC) {
2291 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2292 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2293 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2294 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2295
2296 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2297
2298 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2299 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2300 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2301
2302 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2303
2304 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2305 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2306
2307 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2308 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2309 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2310
2311 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2312
2313 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2314
2315 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2316 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2317 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2318 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2319 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2320 }
2321
2322 if (UseParallelGC || UseParallelOldGC) {
2323 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2324 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2325
2326 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2327 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2328
2329 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2330 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2331
2332 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2333
2334 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2335 }
2336 #endif // INCLUDE_ALL_GCS
2337
2338 status = status && verify_interval(RefDiscoveryPolicy,
2339 ReferenceProcessor::DiscoveryPolicyMin,
2340 ReferenceProcessor::DiscoveryPolicyMax,
2341 "RefDiscoveryPolicy");
2342
2343 // Limit the lower bound of this flag to 1 as it is used in a division
2344 // expression.
2345 status = status && verify_interval(TLABWasteTargetPercent,
2346 1, 100, "TLABWasteTargetPercent");
2347
2348 status = status && verify_object_alignment();
2349
2350 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G,
2351 "CompressedClassSpaceSize");
2352
2353 status = status && verify_interval(MarkStackSizeMax,
2354 1, (max_jint - 1), "MarkStackSizeMax");
2355 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2356
2357 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2358
2359 status = status && verify_min_value(HeapSizePerGCThread, (size_t) os::vm_page_size(), "HeapSizePerGCThread");
2360
2361 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2362
2363 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2364 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2365
2366 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2367
2368 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2369 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2370 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2371 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2372
2373 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2374 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2375
2376 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2377 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2378 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2379
2380 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2381 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2382
2383 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold");
2384 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold");
2385 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2386 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2387
2388 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2389 #ifdef COMPILER1
2390 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize");
2391 #endif
2392 status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps");
2393
2394 if (PrintNMTStatistics) {
2395 #if INCLUDE_NMT
2396 if (MemTracker::tracking_level() == NMT_off) {
2397 #endif // INCLUDE_NMT
2398 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2399 PrintNMTStatistics = false;
2400 #if INCLUDE_NMT
2401 }
2402 #endif
2403 }
2404
2405 // Need to limit the extent of the padding to reasonable size.
2406 // 8K is well beyond the reasonable HW cache line size, even with the
2407 // aggressive prefetching, while still leaving the room for segregating
2408 // among the distinct pages.
2409 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2410 jio_fprintf(defaultStream::error_stream(),
2411 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n",
2412 ContendedPaddingWidth, 0, 8192);
2413 status = false;
2414 }
2415
2416 // Need to enforce the padding not to break the existing field alignments.
2417 // It is sufficient to check against the largest type size.
2418 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2419 jio_fprintf(defaultStream::error_stream(),
2420 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n",
2421 ContendedPaddingWidth, BytesPerLong);
2422 status = false;
2423 }
2424
2425 // Check lower bounds of the code cache
2426 // Template Interpreter code is approximately 3X larger in debug builds.
2427 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2428 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2429 jio_fprintf(defaultStream::error_stream(),
2430 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2431 os::vm_page_size()/K);
2432 status = false;
2433 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2434 jio_fprintf(defaultStream::error_stream(),
2435 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2436 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2437 status = false;
2438 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2439 jio_fprintf(defaultStream::error_stream(),
2440 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2441 min_code_cache_size/K);
2442 status = false;
2443 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2444 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2445 jio_fprintf(defaultStream::error_stream(),
2446 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2447 CODE_CACHE_SIZE_LIMIT/M);
2448 status = false;
2449 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2450 jio_fprintf(defaultStream::error_stream(),
2451 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2452 min_code_cache_size/K);
2453 status = false;
2454 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2455 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2456 jio_fprintf(defaultStream::error_stream(),
2457 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2458 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2459 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2460 status = false;
2461 }
2462
2463 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity");
2464 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength");
2465 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize");
2466 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt");
2467
2468
2469 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2470 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2471 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2472 // Check the minimum number of compiler threads
2473 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount");
2474
2475 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2476 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2477 }
2478
2479 return status;
2480 }
2481
2482 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2483 const char* option_type) {
2484 if (ignore) return false;
2485
2486 const char* spacer = " ";
2487 if (option_type == NULL) {
2488 option_type = ++spacer; // Set both to the empty string.
2489 }
2490
2491 if (os::obsolete_option(option)) {
2492 jio_fprintf(defaultStream::error_stream(),
2493 "Obsolete %s%soption: %s\n", option_type, spacer,
2494 option->optionString);
2495 return false;
2496 } else {
2497 jio_fprintf(defaultStream::error_stream(),
2498 "Unrecognized %s%soption: %s\n", option_type, spacer,
2499 option->optionString);
2500 return true;
2501 }
2502 }
2503
2504 static const char* user_assertion_options[] = {
2505 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2506 };
2507
2508 static const char* system_assertion_options[] = {
2509 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2510 };
2511
2512 bool Arguments::parse_uintx(const char* value,
2513 uintx* uintx_arg,
2514 uintx min_size) {
2515
2516 // Check the sign first since atomull() parses only unsigned values.
2517 bool value_is_positive = !(*value == '-');
2518
2519 if (value_is_positive) {
2520 julong n;
2521 bool good_return = atomull(value, &n);
2522 if (good_return) {
2523 bool above_minimum = n >= min_size;
2524 bool value_is_too_large = n > max_uintx;
2525
2526 if (above_minimum && !value_is_too_large) {
2527 *uintx_arg = n;
2528 return true;
2529 }
2530 }
2531 }
2532 return false;
2533 }
2534
2535 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2536 julong* long_arg,
2537 julong min_size) {
2538 if (!atomull(s, long_arg)) return arg_unreadable;
2539 return check_memory_size(*long_arg, min_size);
2540 }
2541
2542 // Parse JavaVMInitArgs structure
2543
2544 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2545 // For components of the system classpath.
2546 SysClassPath scp(Arguments::get_sysclasspath());
2547 bool scp_assembly_required = false;
2548
2549 // Save default settings for some mode flags
2550 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2551 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2552 Arguments::_ClipInlining = ClipInlining;
2553 Arguments::_BackgroundCompilation = BackgroundCompilation;
2554 if (TieredCompilation) {
2555 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2556 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2557 }
2558
2559 // Setup flags for mixed which is the default
2560 set_mode_flags(_mixed);
2561
2562 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2563 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2564 if (result != JNI_OK) {
2565 return result;
2566 }
2567
2568 // Parse JavaVMInitArgs structure passed in
2569 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2570 if (result != JNI_OK) {
2571 return result;
2572 }
2573
2574 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2575 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2576 if (result != JNI_OK) {
2577 return result;
2578 }
2579
2580 // Do final processing now that all arguments have been parsed
2581 result = finalize_vm_init_args(&scp, scp_assembly_required);
2582 if (result != JNI_OK) {
2583 return result;
2584 }
2585
2586 return JNI_OK;
2587 }
2588
2589 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2590 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2591 // are dealing with -agentpath (case where name is a path), otherwise with
2592 // -agentlib
2593 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2594 char *_name;
2595 const char *_hprof = "hprof", *_jdwp = "jdwp";
2596 size_t _len_hprof, _len_jdwp, _len_prefix;
2597
2598 if (is_path) {
2599 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2600 return false;
2601 }
2602
2603 _name++; // skip past last path separator
2604 _len_prefix = strlen(JNI_LIB_PREFIX);
2605
2606 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2607 return false;
2608 }
2609
2610 _name += _len_prefix;
2611 _len_hprof = strlen(_hprof);
2612 _len_jdwp = strlen(_jdwp);
2613
2614 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2615 _name += _len_hprof;
2616 }
2617 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2618 _name += _len_jdwp;
2619 }
2620 else {
2621 return false;
2622 }
2623
2624 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2625 return false;
2626 }
2627
2628 return true;
2629 }
2630
2631 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2632 return true;
2633 }
2634
2635 return false;
2636 }
2637
2638 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2639 SysClassPath* scp_p,
2640 bool* scp_assembly_required_p,
2641 Flag::Flags origin) {
2642 // Remaining part of option string
2643 const char* tail;
2644
2645 // iterate over arguments
2646 for (int index = 0; index < args->nOptions; index++) {
2647 bool is_absolute_path = false; // for -agentpath vs -agentlib
2648
2649 const JavaVMOption* option = args->options + index;
2650
2651 if (!match_option(option, "-Djava.class.path", &tail) &&
2652 !match_option(option, "-Dsun.java.command", &tail) &&
2653 !match_option(option, "-Dsun.java.launcher", &tail)) {
2654
2655 // add all jvm options to the jvm_args string. This string
2656 // is used later to set the java.vm.args PerfData string constant.
2657 // the -Djava.class.path and the -Dsun.java.command options are
2658 // omitted from jvm_args string as each have their own PerfData
2659 // string constant object.
2660 build_jvm_args(option->optionString);
2661 }
2662
2663 // -verbose:[class/gc/jni]
2664 if (match_option(option, "-verbose", &tail)) {
2665 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2666 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2667 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2668 } else if (!strcmp(tail, ":gc")) {
2669 FLAG_SET_CMDLINE(bool, PrintGC, true);
2670 } else if (!strcmp(tail, ":jni")) {
2671 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2672 }
2673 // -da / -ea / -disableassertions / -enableassertions
2674 // These accept an optional class/package name separated by a colon, e.g.,
2675 // -da:java.lang.Thread.
2676 } else if (match_option(option, user_assertion_options, &tail, true)) {
2677 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2678 if (*tail == '\0') {
2679 JavaAssertions::setUserClassDefault(enable);
2680 } else {
2681 assert(*tail == ':', "bogus match by match_option()");
2682 JavaAssertions::addOption(tail + 1, enable);
2683 }
2684 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2685 } else if (match_option(option, system_assertion_options, &tail, false)) {
2686 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2687 JavaAssertions::setSystemClassDefault(enable);
2688 // -bootclasspath:
2689 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2690 scp_p->reset_path(tail);
2691 *scp_assembly_required_p = true;
2692 // -bootclasspath/a:
2693 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2694 scp_p->add_suffix(tail);
2695 *scp_assembly_required_p = true;
2696 // -bootclasspath/p:
2697 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2698 scp_p->add_prefix(tail);
2699 *scp_assembly_required_p = true;
2700 // -Xrun
2701 } else if (match_option(option, "-Xrun", &tail)) {
2702 if (tail != NULL) {
2703 const char* pos = strchr(tail, ':');
2704 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2705 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2706 name[len] = '\0';
2707
2708 char *options = NULL;
2709 if(pos != NULL) {
2710 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2711 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2712 }
2713 #if !INCLUDE_JVMTI
2714 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2715 jio_fprintf(defaultStream::error_stream(),
2716 "Profiling and debugging agents are not supported in this VM\n");
2717 return JNI_ERR;
2718 }
2719 #endif // !INCLUDE_JVMTI
2720 add_init_library(name, options);
2721 }
2722 // -agentlib and -agentpath
2723 } else if (match_option(option, "-agentlib:", &tail) ||
2724 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2725 if(tail != NULL) {
2726 const char* pos = strchr(tail, '=');
2727 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2728 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2729 name[len] = '\0';
2730
2731 char *options = NULL;
2732 if(pos != NULL) {
2733 options = os::strdup_check_oom(pos + 1, mtInternal);
2734 }
2735 #if !INCLUDE_JVMTI
2736 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2737 jio_fprintf(defaultStream::error_stream(),
2738 "Profiling and debugging agents are not supported in this VM\n");
2739 return JNI_ERR;
2740 }
2741 #endif // !INCLUDE_JVMTI
2742 add_init_agent(name, options, is_absolute_path);
2743 }
2744 // -javaagent
2745 } else if (match_option(option, "-javaagent:", &tail)) {
2746 #if !INCLUDE_JVMTI
2747 jio_fprintf(defaultStream::error_stream(),
2748 "Instrumentation agents are not supported in this VM\n");
2749 return JNI_ERR;
2750 #else
2751 if(tail != NULL) {
2752 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2753 add_init_agent("instrument", options, false);
2754 }
2755 #endif // !INCLUDE_JVMTI
2756 // -Xnoclassgc
2757 } else if (match_option(option, "-Xnoclassgc")) {
2758 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2759 // -Xconcgc
2760 } else if (match_option(option, "-Xconcgc")) {
2761 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2762 // -Xnoconcgc
2763 } else if (match_option(option, "-Xnoconcgc")) {
2764 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2765 // -Xbatch
2766 } else if (match_option(option, "-Xbatch")) {
2767 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2768 // -Xmn for compatibility with other JVM vendors
2769 } else if (match_option(option, "-Xmn", &tail)) {
2770 julong long_initial_young_size = 0;
2771 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2772 if (errcode != arg_in_range) {
2773 jio_fprintf(defaultStream::error_stream(),
2774 "Invalid initial young generation size: %s\n", option->optionString);
2775 describe_range_error(errcode);
2776 return JNI_EINVAL;
2777 }
2778 FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size);
2779 FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size);
2780 // -Xms
2781 } else if (match_option(option, "-Xms", &tail)) {
2782 julong long_initial_heap_size = 0;
2783 // an initial heap size of 0 means automatically determine
2784 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2785 if (errcode != arg_in_range) {
2786 jio_fprintf(defaultStream::error_stream(),
2787 "Invalid initial heap size: %s\n", option->optionString);
2788 describe_range_error(errcode);
2789 return JNI_EINVAL;
2790 }
2791 set_min_heap_size((size_t)long_initial_heap_size);
2792 // Currently the minimum size and the initial heap sizes are the same.
2793 // Can be overridden with -XX:InitialHeapSize.
2794 FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size);
2795 // -Xmx
2796 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2797 julong long_max_heap_size = 0;
2798 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2799 if (errcode != arg_in_range) {
2800 jio_fprintf(defaultStream::error_stream(),
2801 "Invalid maximum heap size: %s\n", option->optionString);
2802 describe_range_error(errcode);
2803 return JNI_EINVAL;
2804 }
2805 FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size);
2806 // Xmaxf
2807 } else if (match_option(option, "-Xmaxf", &tail)) {
2808 char* err;
2809 int maxf = (int)(strtod(tail, &err) * 100);
2810 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) {
2811 jio_fprintf(defaultStream::error_stream(),
2812 "Bad max heap free percentage size: %s\n",
2813 option->optionString);
2814 return JNI_EINVAL;
2815 } else {
2816 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2817 }
2818 // Xminf
2819 } else if (match_option(option, "-Xminf", &tail)) {
2820 char* err;
2821 int minf = (int)(strtod(tail, &err) * 100);
2822 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) {
2823 jio_fprintf(defaultStream::error_stream(),
2824 "Bad min heap free percentage size: %s\n",
2825 option->optionString);
2826 return JNI_EINVAL;
2827 } else {
2828 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2829 }
2830 // -Xss
2831 } else if (match_option(option, "-Xss", &tail)) {
2832 julong long_ThreadStackSize = 0;
2833 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2834 if (errcode != arg_in_range) {
2835 jio_fprintf(defaultStream::error_stream(),
2836 "Invalid thread stack size: %s\n", option->optionString);
2837 describe_range_error(errcode);
2838 return JNI_EINVAL;
2839 }
2840 // Internally track ThreadStackSize in units of 1024 bytes.
2841 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2842 round_to((int)long_ThreadStackSize, K) / K);
2843 // -Xoss
2844 } else if (match_option(option, "-Xoss", &tail)) {
2845 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2846 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2847 julong long_CodeCacheExpansionSize = 0;
2848 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2849 if (errcode != arg_in_range) {
2850 jio_fprintf(defaultStream::error_stream(),
2851 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2852 os::vm_page_size()/K);
2853 return JNI_EINVAL;
2854 }
2855 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2856 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2857 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2858 julong long_ReservedCodeCacheSize = 0;
2859
2860 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2861 if (errcode != arg_in_range) {
2862 jio_fprintf(defaultStream::error_stream(),
2863 "Invalid maximum code cache size: %s.\n", option->optionString);
2864 return JNI_EINVAL;
2865 }
2866 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2867 // -XX:NonNMethodCodeHeapSize=
2868 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2869 julong long_NonNMethodCodeHeapSize = 0;
2870
2871 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2872 if (errcode != arg_in_range) {
2873 jio_fprintf(defaultStream::error_stream(),
2874 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2875 return JNI_EINVAL;
2876 }
2877 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize);
2878 // -XX:ProfiledCodeHeapSize=
2879 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2880 julong long_ProfiledCodeHeapSize = 0;
2881
2882 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2883 if (errcode != arg_in_range) {
2884 jio_fprintf(defaultStream::error_stream(),
2885 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2886 return JNI_EINVAL;
2887 }
2888 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize);
2889 // -XX:NonProfiledCodeHeapSizee=
2890 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2891 julong long_NonProfiledCodeHeapSize = 0;
2892
2893 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2894 if (errcode != arg_in_range) {
2895 jio_fprintf(defaultStream::error_stream(),
2896 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2897 return JNI_EINVAL;
2898 }
2899 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize);
2900 //-XX:IncreaseFirstTierCompileThresholdAt=
2901 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2902 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2903 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2904 jio_fprintf(defaultStream::error_stream(),
2905 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2906 option->optionString);
2907 return JNI_EINVAL;
2908 }
2909 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2910 // -green
2911 } else if (match_option(option, "-green")) {
2912 jio_fprintf(defaultStream::error_stream(),
2913 "Green threads support not available\n");
2914 return JNI_EINVAL;
2915 // -native
2916 } else if (match_option(option, "-native")) {
2917 // HotSpot always uses native threads, ignore silently for compatibility
2918 // -Xsqnopause
2919 } else if (match_option(option, "-Xsqnopause")) {
2920 // EVM option, ignore silently for compatibility
2921 // -Xrs
2922 } else if (match_option(option, "-Xrs")) {
2923 // Classic/EVM option, new functionality
2924 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2925 } else if (match_option(option, "-Xusealtsigs")) {
2926 // change default internal VM signals used - lower case for back compat
2927 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2928 // -Xoptimize
2929 } else if (match_option(option, "-Xoptimize")) {
2930 // EVM option, ignore silently for compatibility
2931 // -Xprof
2932 } else if (match_option(option, "-Xprof")) {
2933 #if INCLUDE_FPROF
2934 _has_profile = true;
2935 #else // INCLUDE_FPROF
2936 jio_fprintf(defaultStream::error_stream(),
2937 "Flat profiling is not supported in this VM.\n");
2938 return JNI_ERR;
2939 #endif // INCLUDE_FPROF
2940 // -Xconcurrentio
2941 } else if (match_option(option, "-Xconcurrentio")) {
2942 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2943 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2944 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2945 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2946 FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2947
2948 // -Xinternalversion
2949 } else if (match_option(option, "-Xinternalversion")) {
2950 jio_fprintf(defaultStream::output_stream(), "%s\n",
2951 VM_Version::internal_vm_info_string());
2952 vm_exit(0);
2953 #ifndef PRODUCT
2954 // -Xprintflags
2955 } else if (match_option(option, "-Xprintflags")) {
2956 CommandLineFlags::printFlags(tty, false);
2957 vm_exit(0);
2958 #endif
2959 // -D
2960 } else if (match_option(option, "-D", &tail)) {
2961 const char* value;
2962 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2963 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2964 // abort if -Djava.endorsed.dirs is set
2965 jio_fprintf(defaultStream::output_stream(),
2966 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2967 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2968 return JNI_EINVAL;
2969 }
2970 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2971 *value != '\0' && strcmp(value, "\"\"") != 0) {
2972 // abort if -Djava.ext.dirs is set
2973 jio_fprintf(defaultStream::output_stream(),
2974 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2975 return JNI_EINVAL;
2976 }
2977
2978 if (!add_property(tail)) {
2979 return JNI_ENOMEM;
2980 }
2981 // Out of the box management support
2982 if (match_option(option, "-Dcom.sun.management", &tail)) {
2983 #if INCLUDE_MANAGEMENT
2984 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2985 #else
2986 jio_fprintf(defaultStream::output_stream(),
2987 "-Dcom.sun.management is not supported in this VM.\n");
2988 return JNI_ERR;
2989 #endif
2990 }
2991 // -Xint
2992 } else if (match_option(option, "-Xint")) {
2993 set_mode_flags(_int);
2994 // -Xmixed
2995 } else if (match_option(option, "-Xmixed")) {
2996 set_mode_flags(_mixed);
2997 // -Xcomp
2998 } else if (match_option(option, "-Xcomp")) {
2999 // for testing the compiler; turn off all flags that inhibit compilation
3000 set_mode_flags(_comp);
3001 // -Xshare:dump
3002 } else if (match_option(option, "-Xshare:dump")) {
3003 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
3004 set_mode_flags(_int); // Prevent compilation, which creates objects
3005 // -Xshare:on
3006 } else if (match_option(option, "-Xshare:on")) {
3007 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3008 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3009 // -Xshare:auto
3010 } else if (match_option(option, "-Xshare:auto")) {
3011 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3012 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3013 // -Xshare:off
3014 } else if (match_option(option, "-Xshare:off")) {
3015 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
3016 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
3017 // -Xverify
3018 } else if (match_option(option, "-Xverify", &tail)) {
3019 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3020 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
3021 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3022 } else if (strcmp(tail, ":remote") == 0) {
3023 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3024 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
3025 } else if (strcmp(tail, ":none") == 0) {
3026 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
3027 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
3028 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3029 return JNI_EINVAL;
3030 }
3031 // -Xdebug
3032 } else if (match_option(option, "-Xdebug")) {
3033 // note this flag has been used, then ignore
3034 set_xdebug_mode(true);
3035 // -Xnoagent
3036 } else if (match_option(option, "-Xnoagent")) {
3037 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3038 } else if (match_option(option, "-Xboundthreads")) {
3039 // Ignore silently for compatibility
3040 } else if (match_option(option, "-Xloggc:", &tail)) {
3041 // Redirect GC output to the file. -Xloggc:<filename>
3042 // ostream_init_log(), when called will use this filename
3043 // to initialize a fileStream.
3044 _gc_log_filename = os::strdup_check_oom(tail);
3045 if (!is_filename_valid(_gc_log_filename)) {
3046 jio_fprintf(defaultStream::output_stream(),
3047 "Invalid file name for use with -Xloggc: Filename can only contain the "
3048 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3049 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3050 return JNI_EINVAL;
3051 }
3052 FLAG_SET_CMDLINE(bool, PrintGC, true);
3053 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
3054
3055 // JNI hooks
3056 } else if (match_option(option, "-Xcheck", &tail)) {
3057 if (!strcmp(tail, ":jni")) {
3058 #if !INCLUDE_JNI_CHECK
3059 warning("JNI CHECKING is not supported in this VM");
3060 #else
3061 CheckJNICalls = true;
3062 #endif // INCLUDE_JNI_CHECK
3063 } else if (is_bad_option(option, args->ignoreUnrecognized,
3064 "check")) {
3065 return JNI_EINVAL;
3066 }
3067 } else if (match_option(option, "vfprintf")) {
3068 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3069 } else if (match_option(option, "exit")) {
3070 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3071 } else if (match_option(option, "abort")) {
3072 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3073 // -XX:+AggressiveHeap
3074 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3075
3076 // This option inspects the machine and attempts to set various
3077 // parameters to be optimal for long-running, memory allocation
3078 // intensive jobs. It is intended for machines with large
3079 // amounts of cpu and memory.
3080
3081 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
3082 // VM, but we may not be able to represent the total physical memory
3083 // available (like having 8gb of memory on a box but using a 32bit VM).
3084 // Thus, we need to make sure we're using a julong for intermediate
3085 // calculations.
3086 julong initHeapSize;
3087 julong total_memory = os::physical_memory();
3088
3089 if (total_memory < (julong)256*M) {
3090 jio_fprintf(defaultStream::error_stream(),
3091 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
3092 vm_exit(1);
3093 }
3094
3095 // The heap size is half of available memory, or (at most)
3096 // all of possible memory less 160mb (leaving room for the OS
3097 // when using ISM). This is the maximum; because adaptive sizing
3098 // is turned on below, the actual space used may be smaller.
3099
3100 initHeapSize = MIN2(total_memory / (julong)2,
3101 total_memory - (julong)160*M);
3102
3103 initHeapSize = limit_by_allocatable_memory(initHeapSize);
3104
3105 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
3106 FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize);
3107 FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize);
3108 // Currently the minimum size and the initial heap sizes are the same.
3109 set_min_heap_size(initHeapSize);
3110 }
3111 if (FLAG_IS_DEFAULT(NewSize)) {
3112 // Make the young generation 3/8ths of the total heap.
3113 FLAG_SET_CMDLINE(size_t, NewSize,
3114 ((julong)MaxHeapSize / (julong)8) * (julong)3);
3115 FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize);
3116 }
3117
3118 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3119 FLAG_SET_DEFAULT(UseLargePages, true);
3120 #endif
3121
3122 // Increase some data structure sizes for efficiency
3123 FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize);
3124 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
3125 FLAG_SET_CMDLINE(size_t, TLABSize, 256*K);
3126
3127 // See the OldPLABSize comment below, but replace 'after promotion'
3128 // with 'after copying'. YoungPLABSize is the size of the survivor
3129 // space per-gc-thread buffers. The default is 4kw.
3130 FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K); // Note: this is in words
3131
3132 // OldPLABSize is the size of the buffers in the old gen that
3133 // UseParallelGC uses to promote live data that doesn't fit in the
3134 // survivor spaces. At any given time, there's one for each gc thread.
3135 // The default size is 1kw. These buffers are rarely used, since the
3136 // survivor spaces are usually big enough. For specjbb, however, there
3137 // are occasions when there's lots of live data in the young gen
3138 // and we end up promoting some of it. We don't have a definite
3139 // explanation for why bumping OldPLABSize helps, but the theory
3140 // is that a bigger PLAB results in retaining something like the
3141 // original allocation order after promotion, which improves mutator
3142 // locality. A minor effect may be that larger PLABs reduce the
3143 // number of PLAB allocation events during gc. The value of 8kw
3144 // was arrived at by experimenting with specjbb.
3145 FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K); // Note: this is in words
3146
3147 // Enable parallel GC and adaptive generation sizing
3148 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
3149 FLAG_SET_DEFAULT(ParallelGCThreads,
3150 Abstract_VM_Version::parallel_worker_threads());
3151
3152 // Encourage steady state memory management
3153 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
3154
3155 // This appears to improve mutator locality
3156 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3157
3158 // Get around early Solaris scheduling bug
3159 // (affinity vs other jobs on system)
3160 // but disallow DR and offlining (5008695).
3161 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
3162
3163 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3164 // and the last option wins.
3165 } else if (match_option(option, "-XX:+NeverTenure")) {
3166 FLAG_SET_CMDLINE(bool, NeverTenure, true);
3167 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3168 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1);
3169 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3170 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3171 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3172 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
3173 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3174 uintx max_tenuring_thresh = 0;
3175 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3176 jio_fprintf(defaultStream::error_stream(),
3177 "Improperly specified VM option 'MaxTenuringThreshold=%s'\n", tail);
3178 return JNI_EINVAL;
3179 }
3180 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh);
3181
3182 if (MaxTenuringThreshold == 0) {
3183 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3184 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
3185 } else {
3186 FLAG_SET_CMDLINE(bool, NeverTenure, false);
3187 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
3188 }
3189 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3190 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
3191 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
3192 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3193 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
3194 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
3195 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3196 #if defined(DTRACE_ENABLED)
3197 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
3198 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
3199 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
3200 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3201 #else // defined(DTRACE_ENABLED)
3202 jio_fprintf(defaultStream::error_stream(),
3203 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3204 return JNI_EINVAL;
3205 #endif // defined(DTRACE_ENABLED)
3206 #ifdef ASSERT
3207 } else if (match_option(option, "-XX:+FullGCALot")) {
3208 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3209 // disable scavenge before parallel mark-compact
3210 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3211 #endif
3212 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3213 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3214 julong stack_size = 0;
3215 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3216 if (errcode != arg_in_range) {
3217 jio_fprintf(defaultStream::error_stream(),
3218 "Invalid mark stack size: %s\n", option->optionString);
3219 describe_range_error(errcode);
3220 return JNI_EINVAL;
3221 }
3222 jio_fprintf(defaultStream::error_stream(),
3223 "Please use -XX:MarkStackSize in place of "
3224 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n");
3225 FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size);
3226 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3227 julong max_stack_size = 0;
3228 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3229 if (errcode != arg_in_range) {
3230 jio_fprintf(defaultStream::error_stream(),
3231 "Invalid maximum mark stack size: %s\n",
3232 option->optionString);
3233 describe_range_error(errcode);
3234 return JNI_EINVAL;
3235 }
3236 jio_fprintf(defaultStream::error_stream(),
3237 "Please use -XX:MarkStackSizeMax in place of "
3238 "-XX:CMSMarkStackSizeMax in the future\n");
3239 FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size);
3240 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3241 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3242 uintx conc_threads = 0;
3243 if (!parse_uintx(tail, &conc_threads, 1)) {
3244 jio_fprintf(defaultStream::error_stream(),
3245 "Invalid concurrent threads: %s\n", option->optionString);
3246 return JNI_EINVAL;
3247 }
3248 jio_fprintf(defaultStream::error_stream(),
3249 "Please use -XX:ConcGCThreads in place of "
3250 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n");
3251 FLAG_SET_CMDLINE(uint, ConcGCThreads, conc_threads);
3252 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3253 julong max_direct_memory_size = 0;
3254 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3255 if (errcode != arg_in_range) {
3256 jio_fprintf(defaultStream::error_stream(),
3257 "Invalid maximum direct memory size: %s\n",
3258 option->optionString);
3259 describe_range_error(errcode);
3260 return JNI_EINVAL;
3261 }
3262 FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size);
3263 #if !INCLUDE_MANAGEMENT
3264 } else if (match_option(option, "-XX:+ManagementServer")) {
3265 jio_fprintf(defaultStream::error_stream(),
3266 "ManagementServer is not supported in this VM.\n");
3267 return JNI_ERR;
3268 #endif // INCLUDE_MANAGEMENT
3269 // CreateMinidumpOnCrash is removed, and replaced by CreateCoredumpOnCrash
3270 } else if (match_option(option, "-XX:+CreateMinidumpOnCrash")) {
3271 FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, true);
3272 jio_fprintf(defaultStream::output_stream(),
3273 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is on\n");
3274 } else if (match_option(option, "-XX:-CreateMinidumpOnCrash")) {
3275 FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, false);
3276 jio_fprintf(defaultStream::output_stream(),
3277 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is off\n");
3278 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3279 // Skip -XX:Flags= since that case has already been handled
3280 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3281 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3282 return JNI_EINVAL;
3283 }
3284 }
3285 // Unknown option
3286 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3287 return JNI_ERR;
3288 }
3289 }
3290
3291 // PrintSharedArchiveAndExit will turn on
3292 // -Xshare:on
3293 // -XX:+TraceClassPaths
3294 if (PrintSharedArchiveAndExit) {
3295 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
3296 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
3297 FLAG_SET_CMDLINE(bool, TraceClassPaths, true);
3298 }
3299
3300 // Change the default value for flags which have different default values
3301 // when working with older JDKs.
3302 #ifdef LINUX
3303 if (JDK_Version::current().compare_major(6) <= 0 &&
3304 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3305 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3306 }
3307 #endif // LINUX
3308 fix_appclasspath();
3309 return JNI_OK;
3310 }
3311
3312 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3313 //
3314 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3315 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3316 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3317 // path is treated as the current directory.
3318 //
3319 // This causes problems with CDS, which requires that all directories specified in the classpath
3320 // must be empty. In most cases, applications do NOT want to load classes from the current
3321 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3322 // scripts compatible with CDS.
3323 void Arguments::fix_appclasspath() {
3324 if (IgnoreEmptyClassPaths) {
3325 const char separator = *os::path_separator();
3326 const char* src = _java_class_path->value();
3327
3328 // skip over all the leading empty paths
3329 while (*src == separator) {
3330 src ++;
3331 }
3332
3333 char* copy = os::strdup_check_oom(src, mtInternal);
3334
3335 // trim all trailing empty paths
3336 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3337 *tail = '\0';
3338 }
3339
3340 char from[3] = {separator, separator, '\0'};
3341 char to [2] = {separator, '\0'};
3342 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3343 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3344 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3345 }
3346
3347 _java_class_path->set_value(copy);
3348 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3349 }
3350
3351 if (!PrintSharedArchiveAndExit) {
3352 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3353 }
3354 }
3355
3356 static bool has_jar_files(const char* directory) {
3357 DIR* dir = os::opendir(directory);
3358 if (dir == NULL) return false;
3359
3360 struct dirent *entry;
3361 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3362 bool hasJarFile = false;
3363 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3364 const char* name = entry->d_name;
3365 const char* ext = name + strlen(name) - 4;
3366 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3367 }
3368 FREE_C_HEAP_ARRAY(char, dbuf);
3369 os::closedir(dir);
3370 return hasJarFile ;
3371 }
3372
3373 static int check_non_empty_dirs(const char* path) {
3374 const char separator = *os::path_separator();
3375 const char* const end = path + strlen(path);
3376 int nonEmptyDirs = 0;
3377 while (path < end) {
3378 const char* tmp_end = strchr(path, separator);
3379 if (tmp_end == NULL) {
3380 if (has_jar_files(path)) {
3381 nonEmptyDirs++;
3382 jio_fprintf(defaultStream::output_stream(),
3383 "Non-empty directory: %s\n", path);
3384 }
3385 path = end;
3386 } else {
3387 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3388 memcpy(dirpath, path, tmp_end - path);
3389 dirpath[tmp_end - path] = '\0';
3390 if (has_jar_files(dirpath)) {
3391 nonEmptyDirs++;
3392 jio_fprintf(defaultStream::output_stream(),
3393 "Non-empty directory: %s\n", dirpath);
3394 }
3395 FREE_C_HEAP_ARRAY(char, dirpath);
3396 path = tmp_end + 1;
3397 }
3398 }
3399 return nonEmptyDirs;
3400 }
3401
3402 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3403 // check if the default lib/endorsed directory exists; if so, error
3404 char path[JVM_MAXPATHLEN];
3405 const char* fileSep = os::file_separator();
3406 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3407
3408 if (CheckEndorsedAndExtDirs) {
3409 int nonEmptyDirs = 0;
3410 // check endorsed directory
3411 nonEmptyDirs += check_non_empty_dirs(path);
3412 // check the extension directories
3413 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3414 if (nonEmptyDirs > 0) {
3415 return JNI_ERR;
3416 }
3417 }
3418
3419 DIR* dir = os::opendir(path);
3420 if (dir != NULL) {
3421 jio_fprintf(defaultStream::output_stream(),
3422 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3423 "in modular form will be supported via the concept of upgradeable modules.\n");
3424 os::closedir(dir);
3425 return JNI_ERR;
3426 }
3427
3428 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3429 dir = os::opendir(path);
3430 if (dir != NULL) {
3431 jio_fprintf(defaultStream::output_stream(),
3432 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3433 "Use -classpath instead.\n.");
3434 os::closedir(dir);
3435 return JNI_ERR;
3436 }
3437
3438 if (scp_assembly_required) {
3439 // Assemble the bootclasspath elements into the final path.
3440 Arguments::set_sysclasspath(scp_p->combined_path());
3441 }
3442
3443 // This must be done after all arguments have been processed.
3444 // java_compiler() true means set to "NONE" or empty.
3445 if (java_compiler() && !xdebug_mode()) {
3446 // For backwards compatibility, we switch to interpreted mode if
3447 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3448 // not specified.
3449 set_mode_flags(_int);
3450 }
3451
3452 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3453 // but like -Xint, leave compilation thresholds unaffected.
3454 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3455 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3456 set_mode_flags(_int);
3457 }
3458
3459 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3460 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3461 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3462 }
3463
3464 #ifndef COMPILER2
3465 // Don't degrade server performance for footprint
3466 if (FLAG_IS_DEFAULT(UseLargePages) &&
3467 MaxHeapSize < LargePageHeapSizeThreshold) {
3468 // No need for large granularity pages w/small heaps.
3469 // Note that large pages are enabled/disabled for both the
3470 // Java heap and the code cache.
3471 FLAG_SET_DEFAULT(UseLargePages, false);
3472 }
3473
3474 #else
3475 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3476 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3477 }
3478 #endif
3479
3480 #ifndef TIERED
3481 // Tiered compilation is undefined.
3482 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3483 #endif
3484
3485 // If we are running in a headless jre, force java.awt.headless property
3486 // to be true unless the property has already been set.
3487 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3488 if (os::is_headless_jre()) {
3489 const char* headless = Arguments::get_property("java.awt.headless");
3490 if (headless == NULL) {
3491 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3492 if (headless_env == NULL) {
3493 if (!add_property("java.awt.headless=true")) {
3494 return JNI_ENOMEM;
3495 }
3496 } else {
3497 char buffer[256];
3498 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3499 if (!add_property(buffer)) {
3500 return JNI_ENOMEM;
3501 }
3502 }
3503 }
3504 }
3505
3506 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3507 // CMS can only be used with ParNew
3508 FLAG_SET_ERGO(bool, UseParNewGC, true);
3509 }
3510
3511 if (!check_vm_args_consistency()) {
3512 return JNI_ERR;
3513 }
3514
3515 return JNI_OK;
3516 }
3517
3518 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3519 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3520 scp_assembly_required_p);
3521 }
3522
3523 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3524 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3525 scp_assembly_required_p);
3526 }
3527
3528 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3529 char *buffer = ::getenv(name);
3530
3531 // Don't check this variable if user has special privileges
3532 // (e.g. unix su command).
3533 if (buffer == NULL || os::have_special_privileges()) {
3534 return JNI_OK;
3535 }
3536
3537 if ((buffer = os::strdup(buffer)) == NULL) {
3538 return JNI_ENOMEM;
3539 }
3540
3541 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3542 jio_fprintf(defaultStream::error_stream(),
3543 "Picked up %s: %s\n", name, buffer);
3544 char* rd = buffer; // pointer to the input string (rd)
3545 while (true) { // repeat for all options in the input string
3546 while (isspace(*rd)) rd++; // skip whitespace
3547 if (*rd == 0) break; // we re done when the input string is read completely
3548
3549 // The output, option string, overwrites the input string.
3550 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3551 // input string (rd).
3552 char* wrt = rd;
3553
3554 JavaVMOption option;
3555 option.optionString = wrt;
3556 options->append(option); // Fill in option
3557 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3558 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3559 int quote = *rd; // matching quote to look for
3560 rd++; // don't copy open quote
3561 while (*rd != quote) { // include everything (even spaces) up until quote
3562 if (*rd == 0) { // string termination means unmatched string
3563 jio_fprintf(defaultStream::error_stream(),
3564 "Unmatched quote in %s\n", name);
3565 delete options;
3566 os::free(buffer);
3567 return JNI_ERR;
3568 }
3569 *wrt++ = *rd++; // copy to option string
3570 }
3571 rd++; // don't copy close quote
3572 } else {
3573 *wrt++ = *rd++; // copy to option string
3574 }
3575 }
3576 // Need to check if we're done before writing a NULL,
3577 // because the write could be to the byte that rd is pointing to.
3578 if (*rd++ == 0) {
3579 *wrt = 0;
3580 break;
3581 }
3582 *wrt = 0; // Zero terminate option
3583 }
3584 JavaVMOption* options_arr =
3585 NEW_C_HEAP_ARRAY_RETURN_NULL(JavaVMOption, options->length(), mtInternal);
3586 if (options_arr == NULL) {
3587 delete options;
3588 os::free(buffer);
3589 return JNI_ENOMEM;
3590 }
3591 for (int i = 0; i < options->length(); i++) {
3592 options_arr[i] = options->at(i);
3593 }
3594
3595 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3596 JavaVMInitArgs vm_args;
3597 vm_args.version = JNI_VERSION_1_2;
3598 vm_args.options = options_arr;
3599 vm_args.nOptions = options->length();
3600 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3601
3602 if (PrintVMOptions) {
3603 const char* tail;
3604 for (int i = 0; i < vm_args.nOptions; i++) {
3605 const JavaVMOption *option = vm_args.options + i;
3606 if (match_option(option, "-XX:", &tail)) {
3607 logOption(tail);
3608 }
3609 }
3610 }
3611
3612 jint result = parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p,
3613 Flag::ENVIRON_VAR);
3614 FREE_C_HEAP_ARRAY(JavaVMOption, options_arr);
3615 delete options;
3616 os::free(buffer);
3617 return result;
3618 }
3619
3620 void Arguments::set_shared_spaces_flags() {
3621 if (DumpSharedSpaces) {
3622 if (RequireSharedSpaces) {
3623 warning("cannot dump shared archive while using shared archive");
3624 }
3625 UseSharedSpaces = false;
3626 #ifdef _LP64
3627 if (!UseCompressedOops || !UseCompressedClassPointers) {
3628 vm_exit_during_initialization(
3629 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3630 }
3631 } else {
3632 if (!UseCompressedOops || !UseCompressedClassPointers) {
3633 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3634 }
3635 #endif
3636 }
3637 }
3638
3639 #if !INCLUDE_ALL_GCS
3640 static void force_serial_gc() {
3641 FLAG_SET_DEFAULT(UseSerialGC, true);
3642 UNSUPPORTED_GC_OPTION(UseG1GC);
3643 UNSUPPORTED_GC_OPTION(UseParallelGC);
3644 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3645 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3646 UNSUPPORTED_GC_OPTION(UseParNewGC);
3647 }
3648 #endif // INCLUDE_ALL_GCS
3649
3650 // Sharing support
3651 // Construct the path to the archive
3652 static char* get_shared_archive_path() {
3653 char *shared_archive_path;
3654 if (SharedArchiveFile == NULL) {
3655 char jvm_path[JVM_MAXPATHLEN];
3656 os::jvm_path(jvm_path, sizeof(jvm_path));
3657 char *end = strrchr(jvm_path, *os::file_separator());
3658 if (end != NULL) *end = '\0';
3659 size_t jvm_path_len = strlen(jvm_path);
3660 size_t file_sep_len = strlen(os::file_separator());
3661 const size_t len = jvm_path_len + file_sep_len + 20;
3662 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3663 if (shared_archive_path != NULL) {
3664 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3665 jvm_path, os::file_separator());
3666 }
3667 } else {
3668 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3669 }
3670 return shared_archive_path;
3671 }
3672
3673 #ifndef PRODUCT
3674 // Determine whether LogVMOutput should be implicitly turned on.
3675 static bool use_vm_log() {
3676 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3677 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3678 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3679 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3680 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3681 return true;
3682 }
3683
3684 #ifdef COMPILER1
3685 if (PrintC1Statistics) {
3686 return true;
3687 }
3688 #endif // COMPILER1
3689
3690 #ifdef COMPILER2
3691 if (PrintOptoAssembly || PrintOptoStatistics) {
3692 return true;
3693 }
3694 #endif // COMPILER2
3695
3696 return false;
3697 }
3698 #endif // PRODUCT
3699
3700 // Parse entry point called from JNI_CreateJavaVM
3701
3702 jint Arguments::parse(const JavaVMInitArgs* args) {
3703
3704 // Remaining part of option string
3705 const char* tail;
3706
3707 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3708 const char* hotspotrc = ".hotspotrc";
3709 bool settings_file_specified = false;
3710 bool needs_hotspotrc_warning = false;
3711
3712 const char* flags_file;
3713 int index;
3714 for (index = 0; index < args->nOptions; index++) {
3715 const JavaVMOption *option = args->options + index;
3716 if (ArgumentsExt::process_options(option)) {
3717 continue;
3718 }
3719 if (match_option(option, "-XX:Flags=", &tail)) {
3720 flags_file = tail;
3721 settings_file_specified = true;
3722 continue;
3723 }
3724 if (match_option(option, "-XX:+PrintVMOptions")) {
3725 PrintVMOptions = true;
3726 continue;
3727 }
3728 if (match_option(option, "-XX:-PrintVMOptions")) {
3729 PrintVMOptions = false;
3730 continue;
3731 }
3732 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3733 IgnoreUnrecognizedVMOptions = true;
3734 continue;
3735 }
3736 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3737 IgnoreUnrecognizedVMOptions = false;
3738 continue;
3739 }
3740 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3741 CommandLineFlags::printFlags(tty, false);
3742 vm_exit(0);
3743 }
3744 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3745 #if INCLUDE_NMT
3746 // The launcher did not setup nmt environment variable properly.
3747 if (!MemTracker::check_launcher_nmt_support(tail)) {
3748 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3749 }
3750
3751 // Verify if nmt option is valid.
3752 if (MemTracker::verify_nmt_option()) {
3753 // Late initialization, still in single-threaded mode.
3754 if (MemTracker::tracking_level() >= NMT_summary) {
3755 MemTracker::init();
3756 }
3757 } else {
3758 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3759 }
3760 continue;
3761 #else
3762 jio_fprintf(defaultStream::error_stream(),
3763 "Native Memory Tracking is not supported in this VM\n");
3764 return JNI_ERR;
3765 #endif
3766 }
3767
3768 #ifndef PRODUCT
3769 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3770 CommandLineFlags::printFlags(tty, true);
3771 vm_exit(0);
3772 }
3773 #endif
3774 }
3775
3776 if (IgnoreUnrecognizedVMOptions) {
3777 // uncast const to modify the flag args->ignoreUnrecognized
3778 *(jboolean*)(&args->ignoreUnrecognized) = true;
3779 }
3780
3781 // Parse specified settings file
3782 if (settings_file_specified) {
3783 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3784 return JNI_EINVAL;
3785 }
3786 } else {
3787 #ifdef ASSERT
3788 // Parse default .hotspotrc settings file
3789 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3790 return JNI_EINVAL;
3791 }
3792 #else
3793 struct stat buf;
3794 if (os::stat(hotspotrc, &buf) == 0) {
3795 needs_hotspotrc_warning = true;
3796 }
3797 #endif
3798 }
3799
3800 if (PrintVMOptions) {
3801 for (index = 0; index < args->nOptions; index++) {
3802 const JavaVMOption *option = args->options + index;
3803 if (match_option(option, "-XX:", &tail)) {
3804 logOption(tail);
3805 }
3806 }
3807 }
3808
3809 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3810 jint result = parse_vm_init_args(args);
3811 if (result != JNI_OK) {
3812 return result;
3813 }
3814
3815 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3816 SharedArchivePath = get_shared_archive_path();
3817 if (SharedArchivePath == NULL) {
3818 return JNI_ENOMEM;
3819 }
3820
3821 // Set up VerifySharedSpaces
3822 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3823 VerifySharedSpaces = true;
3824 }
3825
3826 // Delay warning until here so that we've had a chance to process
3827 // the -XX:-PrintWarnings flag
3828 if (needs_hotspotrc_warning) {
3829 warning("%s file is present but has been ignored. "
3830 "Run with -XX:Flags=%s to load the file.",
3831 hotspotrc, hotspotrc);
3832 }
3833
3834 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3835 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3836 #endif
3837
3838 ArgumentsExt::report_unsupported_options();
3839
3840 #ifndef PRODUCT
3841 if (TraceBytecodesAt != 0) {
3842 TraceBytecodes = true;
3843 }
3844 if (CountCompiledCalls) {
3845 if (UseCounterDecay) {
3846 warning("UseCounterDecay disabled because CountCalls is set");
3847 UseCounterDecay = false;
3848 }
3849 }
3850 #endif // PRODUCT
3851
3852 if (ScavengeRootsInCode == 0) {
3853 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3854 warning("forcing ScavengeRootsInCode non-zero");
3855 }
3856 ScavengeRootsInCode = 1;
3857 }
3858
3859 if (PrintGCDetails) {
3860 // Turn on -verbose:gc options as well
3861 PrintGC = true;
3862 }
3863
3864 // Set object alignment values.
3865 set_object_alignment();
3866
3867 #if !INCLUDE_ALL_GCS
3868 force_serial_gc();
3869 #endif // INCLUDE_ALL_GCS
3870 #if !INCLUDE_CDS
3871 if (DumpSharedSpaces || RequireSharedSpaces) {
3872 jio_fprintf(defaultStream::error_stream(),
3873 "Shared spaces are not supported in this VM\n");
3874 return JNI_ERR;
3875 }
3876 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3877 warning("Shared spaces are not supported in this VM");
3878 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3879 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3880 }
3881 no_shared_spaces("CDS Disabled");
3882 #endif // INCLUDE_CDS
3883
3884 return JNI_OK;
3885 }
3886
3887 jint Arguments::apply_ergo() {
3888
3889 // Set flags based on ergonomics.
3890 set_ergonomics_flags();
3891
3892 set_shared_spaces_flags();
3893
3894 // Check the GC selections again.
3895 if (!check_gc_consistency()) {
3896 return JNI_EINVAL;
3897 }
3898
3899 if (TieredCompilation) {
3900 set_tiered_flags();
3901 } else {
3902 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3903 if (CompilationPolicyChoice >= 2) {
3904 vm_exit_during_initialization(
3905 "Incompatible compilation policy selected", NULL);
3906 }
3907 // Scale CompileThreshold
3908 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
3909 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
3910 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
3911 }
3912 }
3913
3914 #ifdef COMPILER2
3915 #ifndef PRODUCT
3916 if (PrintIdealGraphLevel > 0) {
3917 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3918 }
3919 #endif
3920 #endif
3921
3922 // Set heap size based on available physical memory
3923 set_heap_size();
3924
3925 ArgumentsExt::set_gc_specific_flags();
3926
3927 // Initialize Metaspace flags and alignments
3928 Metaspace::ergo_initialize();
3929
3930 // Set bytecode rewriting flags
3931 set_bytecode_flags();
3932
3933 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3934 set_aggressive_opts_flags();
3935
3936 // Turn off biased locking for locking debug mode flags,
3937 // which are subtly different from each other but neither works with
3938 // biased locking
3939 if (UseHeavyMonitors
3940 #ifdef COMPILER1
3941 || !UseFastLocking
3942 #endif // COMPILER1
3943 ) {
3944 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3945 // flag set to true on command line; warn the user that they
3946 // can't enable biased locking here
3947 warning("Biased Locking is not supported with locking debug flags"
3948 "; ignoring UseBiasedLocking flag." );
3949 }
3950 UseBiasedLocking = false;
3951 }
3952
3953 #ifdef ZERO
3954 // Clear flags not supported on zero.
3955 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3956 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3957 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3958 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3959 #endif // CC_INTERP
3960
3961 #ifdef COMPILER2
3962 if (!EliminateLocks) {
3963 EliminateNestedLocks = false;
3964 }
3965 if (!Inline) {
3966 IncrementalInline = false;
3967 }
3968 #ifndef PRODUCT
3969 if (!IncrementalInline) {
3970 AlwaysIncrementalInline = false;
3971 }
3972 #endif
3973 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3974 // nothing to use the profiling, turn if off
3975 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3976 }
3977 #endif
3978
3979 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3980 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3981 DebugNonSafepoints = true;
3982 }
3983
3984 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3985 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3986 }
3987
3988 #ifndef PRODUCT
3989 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3990 if (use_vm_log()) {
3991 LogVMOutput = true;
3992 }
3993 }
3994 #endif // PRODUCT
3995
3996 if (PrintCommandLineFlags) {
3997 CommandLineFlags::printSetFlags(tty);
3998 }
3999
4000 // Apply CPU specific policy for the BiasedLocking
4001 if (UseBiasedLocking) {
4002 if (!VM_Version::use_biased_locking() &&
4003 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4004 UseBiasedLocking = false;
4005 }
4006 }
4007 #ifdef COMPILER2
4008 if (!UseBiasedLocking || EmitSync != 0) {
4009 UseOptoBiasInlining = false;
4010 }
4011 #endif
4012
4013 return JNI_OK;
4014 }
4015
4016 jint Arguments::adjust_after_os() {
4017 if (UseNUMA) {
4018 if (UseParallelGC || UseParallelOldGC) {
4019 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4020 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4021 }
4022 }
4023 // UseNUMAInterleaving is set to ON for all collectors and
4024 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4025 // such as the parallel collector for Linux and Solaris will
4026 // interleave old gen and survivor spaces on top of NUMA
4027 // allocation policy for the eden space.
4028 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4029 // all platforms and ParallelGC on Windows will interleave all
4030 // of the heap spaces across NUMA nodes.
4031 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4032 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4033 }
4034 }
4035 return JNI_OK;
4036 }
4037
4038 int Arguments::PropertyList_count(SystemProperty* pl) {
4039 int count = 0;
4040 while(pl != NULL) {
4041 count++;
4042 pl = pl->next();
4043 }
4044 return count;
4045 }
4046
4047 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4048 assert(key != NULL, "just checking");
4049 SystemProperty* prop;
4050 for (prop = pl; prop != NULL; prop = prop->next()) {
4051 if (strcmp(key, prop->key()) == 0) return prop->value();
4052 }
4053 return NULL;
4054 }
4055
4056 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4057 int count = 0;
4058 const char* ret_val = NULL;
4059
4060 while(pl != NULL) {
4061 if(count >= index) {
4062 ret_val = pl->key();
4063 break;
4064 }
4065 count++;
4066 pl = pl->next();
4067 }
4068
4069 return ret_val;
4070 }
4071
4072 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4073 int count = 0;
4074 char* ret_val = NULL;
4075
4076 while(pl != NULL) {
4077 if(count >= index) {
4078 ret_val = pl->value();
4079 break;
4080 }
4081 count++;
4082 pl = pl->next();
4083 }
4084
4085 return ret_val;
4086 }
4087
4088 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4089 SystemProperty* p = *plist;
4090 if (p == NULL) {
4091 *plist = new_p;
4092 } else {
4093 while (p->next() != NULL) {
4094 p = p->next();
4095 }
4096 p->set_next(new_p);
4097 }
4098 }
4099
4100 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4101 if (plist == NULL)
4102 return;
4103
4104 SystemProperty* new_p = new SystemProperty(k, v, true);
4105 PropertyList_add(plist, new_p);
4106 }
4107
4108 void Arguments::PropertyList_add(SystemProperty *element) {
4109 PropertyList_add(&_system_properties, element);
4110 }
4111
4112 // This add maintains unique property key in the list.
4113 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4114 if (plist == NULL)
4115 return;
4116
4117 // If property key exist then update with new value.
4118 SystemProperty* prop;
4119 for (prop = *plist; prop != NULL; prop = prop->next()) {
4120 if (strcmp(k, prop->key()) == 0) {
4121 if (append) {
4122 prop->append_value(v);
4123 } else {
4124 prop->set_value(v);
4125 }
4126 return;
4127 }
4128 }
4129
4130 PropertyList_add(plist, k, v);
4131 }
4132
4133 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4134 // Returns true if all of the source pointed by src has been copied over to
4135 // the destination buffer pointed by buf. Otherwise, returns false.
4136 // Notes:
4137 // 1. If the length (buflen) of the destination buffer excluding the
4138 // NULL terminator character is not long enough for holding the expanded
4139 // pid characters, it also returns false instead of returning the partially
4140 // expanded one.
4141 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4142 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4143 char* buf, size_t buflen) {
4144 const char* p = src;
4145 char* b = buf;
4146 const char* src_end = &src[srclen];
4147 char* buf_end = &buf[buflen - 1];
4148
4149 while (p < src_end && b < buf_end) {
4150 if (*p == '%') {
4151 switch (*(++p)) {
4152 case '%': // "%%" ==> "%"
4153 *b++ = *p++;
4154 break;
4155 case 'p': { // "%p" ==> current process id
4156 // buf_end points to the character before the last character so
4157 // that we could write '\0' to the end of the buffer.
4158 size_t buf_sz = buf_end - b + 1;
4159 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4160
4161 // if jio_snprintf fails or the buffer is not long enough to hold
4162 // the expanded pid, returns false.
4163 if (ret < 0 || ret >= (int)buf_sz) {
4164 return false;
4165 } else {
4166 b += ret;
4167 assert(*b == '\0', "fail in copy_expand_pid");
4168 if (p == src_end && b == buf_end + 1) {
4169 // reach the end of the buffer.
4170 return true;
4171 }
4172 }
4173 p++;
4174 break;
4175 }
4176 default :
4177 *b++ = '%';
4178 }
4179 } else {
4180 *b++ = *p++;
4181 }
4182 }
4183 *b = '\0';
4184 return (p == src_end); // return false if not all of the source was copied
4185 }