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