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