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 // Only make the obsolete check for valid arguments.
841 if (arg_len <= BUFLEN) {
842 // Construct a string which consists only of the argument name without '+', '-', or '='.
843 char stripped_argname[BUFLEN+1];
844 strncpy(stripped_argname, argname, arg_len);
845 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
846
847 if (is_newly_obsolete(stripped_argname, &since)) {
848 char version[256];
849 since.to_string(version, sizeof(version));
850 warning("ignoring option %s; support was removed in %s", stripped_argname, version);
851 return true;
852 }
853 }
854
855 // For locked flags, report a custom error message if available.
856 // Otherwise, report the standard unrecognized VM option.
857 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
858 if (found_flag != NULL) {
859 char locked_message_buf[BUFLEN];
860 found_flag->get_locked_message(locked_message_buf, BUFLEN);
861 if (strlen(locked_message_buf) == 0) {
862 if (found_flag->is_bool() && !has_plus_minus) {
863 jio_fprintf(defaultStream::error_stream(),
864 "Missing +/- setting for VM option '%s'\n", argname);
865 } else if (!found_flag->is_bool() && has_plus_minus) {
866 jio_fprintf(defaultStream::error_stream(),
867 "Unexpected +/- setting in VM option '%s'\n", argname);
868 } else {
869 jio_fprintf(defaultStream::error_stream(),
870 "Improperly specified VM option '%s'\n", argname);
871 }
872 } else {
873 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
874 }
875 } else {
876 jio_fprintf(defaultStream::error_stream(),
877 "Unrecognized VM option '%s'\n", argname);
878 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
879 if (fuzzy_matched != NULL) {
880 jio_fprintf(defaultStream::error_stream(),
881 "Did you mean '%s%s%s'? ",
882 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
883 fuzzy_matched->_name,
884 (fuzzy_matched->is_bool()) ? "" : "=<value>");
885 }
886 }
887
888 // allow for commandline "commenting out" options like -XX:#+Verbose
889 return arg[0] == '#';
890 }
891
892 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
893 FILE* stream = fopen(file_name, "rb");
894 if (stream == NULL) {
895 if (should_exist) {
896 jio_fprintf(defaultStream::error_stream(),
897 "Could not open settings file %s\n", file_name);
898 return false;
899 } else {
900 return true;
901 }
902 }
903
904 char token[1024];
905 int pos = 0;
906
907 bool in_white_space = true;
908 bool in_comment = false;
909 bool in_quote = false;
910 char quote_c = 0;
911 bool result = true;
912
913 int c = getc(stream);
914 while(c != EOF && pos < (int)(sizeof(token)-1)) {
915 if (in_white_space) {
916 if (in_comment) {
917 if (c == '\n') in_comment = false;
918 } else {
919 if (c == '#') in_comment = true;
920 else if (!isspace(c)) {
921 in_white_space = false;
922 token[pos++] = c;
923 }
924 }
925 } else {
926 if (c == '\n' || (!in_quote && isspace(c))) {
927 // token ends at newline, or at unquoted whitespace
928 // this allows a way to include spaces in string-valued options
929 token[pos] = '\0';
930 logOption(token);
931 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
932 build_jvm_flags(token);
933 pos = 0;
934 in_white_space = true;
935 in_quote = false;
936 } else if (!in_quote && (c == '\'' || c == '"')) {
937 in_quote = true;
938 quote_c = c;
939 } else if (in_quote && (c == quote_c)) {
940 in_quote = false;
941 } else {
942 token[pos++] = c;
943 }
944 }
945 c = getc(stream);
946 }
947 if (pos > 0) {
948 token[pos] = '\0';
949 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
950 build_jvm_flags(token);
951 }
952 fclose(stream);
953 return result;
954 }
955
956 //=============================================================================================================
957 // Parsing of properties (-D)
958
959 const char* Arguments::get_property(const char* key) {
960 return PropertyList_get_value(system_properties(), key);
961 }
962
963 bool Arguments::add_property(const char* prop) {
964 const char* eq = strchr(prop, '=');
965 char* key;
966 // ns must be static--its address may be stored in a SystemProperty object.
967 const static char ns[1] = {0};
968 char* value = (char *)ns;
969
970 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
971 key = AllocateHeap(key_len + 1, mtInternal);
972 strncpy(key, prop, key_len);
973 key[key_len] = '\0';
974
975 if (eq != NULL) {
976 size_t value_len = strlen(prop) - key_len - 1;
977 value = AllocateHeap(value_len + 1, mtInternal);
978 strncpy(value, &prop[key_len + 1], value_len + 1);
979 }
980
981 if (strcmp(key, "java.compiler") == 0) {
982 process_java_compiler_argument(value);
983 FreeHeap(key);
984 if (eq != NULL) {
985 FreeHeap(value);
986 }
987 return true;
988 } else if (strcmp(key, "sun.java.command") == 0) {
989 _java_command = value;
990
991 // Record value in Arguments, but let it get passed to Java.
992 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
993 strcmp(key, "sun.java.launcher.pid") == 0) {
994 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
995 // private and are processed in process_sun_java_launcher_properties();
996 // the sun.java.launcher property is passed on to the java application
997 FreeHeap(key);
998 if (eq != NULL) {
999 FreeHeap(value);
1000 }
1001 return true;
1002 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1003 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1004 // its value without going through the property list or making a Java call.
1005 _java_vendor_url_bug = value;
1006 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1007 PropertyList_unique_add(&_system_properties, key, value, true);
1008 return true;
1009 }
1010 // Create new property and add at the end of the list
1011 PropertyList_unique_add(&_system_properties, key, value);
1012 return true;
1013 }
1014
1015 //===========================================================================================================
1016 // Setting int/mixed/comp mode flags
1017
1018 void Arguments::set_mode_flags(Mode mode) {
1019 // Set up default values for all flags.
1020 // If you add a flag to any of the branches below,
1021 // add a default value for it here.
1022 set_java_compiler(false);
1023 _mode = mode;
1024
1025 // Ensure Agent_OnLoad has the correct initial values.
1026 // This may not be the final mode; mode may change later in onload phase.
1027 PropertyList_unique_add(&_system_properties, "java.vm.info",
1028 (char*)VM_Version::vm_info_string(), false);
1029
1030 UseInterpreter = true;
1031 UseCompiler = true;
1032 UseLoopCounter = true;
1033
1034 // Default values may be platform/compiler dependent -
1035 // use the saved values
1036 ClipInlining = Arguments::_ClipInlining;
1037 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1038 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1039 BackgroundCompilation = Arguments::_BackgroundCompilation;
1040 if (TieredCompilation) {
1041 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1042 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1043 }
1044 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1045 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1046 }
1047 }
1048
1049 // Change from defaults based on mode
1050 switch (mode) {
1051 default:
1052 ShouldNotReachHere();
1053 break;
1054 case _int:
1055 UseCompiler = false;
1056 UseLoopCounter = false;
1057 AlwaysCompileLoopMethods = false;
1058 UseOnStackReplacement = false;
1059 break;
1060 case _mixed:
1061 // same as default
1062 break;
1063 case _comp:
1064 UseInterpreter = false;
1065 BackgroundCompilation = false;
1066 ClipInlining = false;
1067 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1068 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1069 // compile a level 4 (C2) and then continue executing it.
1070 if (TieredCompilation) {
1071 Tier3InvokeNotifyFreqLog = 0;
1072 Tier4InvocationThreshold = 0;
1073 }
1074 break;
1075 }
1076 }
1077
1078 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1079 // Conflict: required to use shared spaces (-Xshare:on), but
1080 // incompatible command line options were chosen.
1081
1082 static void no_shared_spaces(const char* message) {
1083 if (RequireSharedSpaces) {
1084 jio_fprintf(defaultStream::error_stream(),
1085 "Class data sharing is inconsistent with other specified options.\n");
1086 vm_exit_during_initialization("Unable to use shared archive.", message);
1087 } else {
1088 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1089 }
1090 }
1091 #endif
1092
1093 // Returns threshold scaled with the value of scale.
1094 // If scale < 0.0, threshold is returned without scaling.
1095 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1096 if (scale == 1.0 || scale < 0.0) {
1097 return threshold;
1098 } else {
1099 return (intx)(threshold * scale);
1100 }
1101 }
1102
1103 // Returns freq_log scaled with the value of scale.
1104 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1105 // If scale < 0.0, freq_log is returned without scaling.
1106 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1107 // Check if scaling is necessary or if negative value was specified.
1108 if (scale == 1.0 || scale < 0.0) {
1109 return freq_log;
1110 }
1111 // Check values to avoid calculating log2 of 0.
1112 if (scale == 0.0 || freq_log == 0) {
1113 return 0;
1114 }
1115 // Determine the maximum notification frequency value currently supported.
1116 // The largest mask value that the interpreter/C1 can handle is
1117 // of length InvocationCounter::number_of_count_bits. Mask values are always
1118 // one bit shorter then the value of the notification frequency. Set
1119 // max_freq_bits accordingly.
1120 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1121 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1122 if (scaled_freq == 0) {
1123 // Return 0 right away to avoid calculating log2 of 0.
1124 return 0;
1125 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1126 return max_freq_bits;
1127 } else {
1128 return log2_intptr(scaled_freq);
1129 }
1130 }
1131
1132 void Arguments::set_tiered_flags() {
1133 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1134 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1135 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1136 }
1137 if (CompilationPolicyChoice < 2) {
1138 vm_exit_during_initialization(
1139 "Incompatible compilation policy selected", NULL);
1140 }
1141 // Increase the code cache size - tiered compiles a lot more.
1142 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1143 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1144 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1145 }
1146 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1147 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1148 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1149
1150 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1151 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1152 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1153 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1154 }
1155 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1156 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1157 }
1158 // Check consistency of code heap sizes
1159 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1160 jio_fprintf(defaultStream::error_stream(),
1161 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1162 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1163 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1164 vm_exit(1);
1165 }
1166 }
1167 }
1168 if (!UseInterpreter) { // -Xcomp
1169 Tier3InvokeNotifyFreqLog = 0;
1170 Tier4InvocationThreshold = 0;
1171 }
1172
1173 if (CompileThresholdScaling < 0) {
1174 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1175 }
1176
1177 // Scale tiered compilation thresholds.
1178 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1179 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1180 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1181 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1182
1183 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1184 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1185 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1186 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1187
1188 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1189 // once these thresholds become supported.
1190
1191 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1192 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1193
1194 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1195 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1196
1197 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1198
1199 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1200 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1201 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1202 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1203 }
1204 }
1205
1206 /**
1207 * Returns the minimum number of compiler threads needed to run the JVM. The following
1208 * configurations are possible.
1209 *
1210 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1211 * compiler threads is 0.
1212 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1213 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1214 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1215 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1216 * C1 can be used, so the minimum number of compiler threads is 1.
1217 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1218 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1219 * the minimum number of compiler threads is 2.
1220 */
1221 int Arguments::get_min_number_of_compiler_threads() {
1222 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1223 return 0; // case 1
1224 #else
1225 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1226 return 1; // case 2 or case 3
1227 }
1228 return 2; // case 4 (tiered)
1229 #endif
1230 }
1231
1232 #if INCLUDE_ALL_GCS
1233 static void disable_adaptive_size_policy(const char* collector_name) {
1234 if (UseAdaptiveSizePolicy) {
1235 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1236 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1237 collector_name);
1238 }
1239 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1240 }
1241 }
1242
1243 void Arguments::set_parnew_gc_flags() {
1244 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1245 "control point invariant");
1246 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1247 assert(UseParNewGC, "ParNew should always be used with CMS");
1248
1249 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1250 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1251 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1252 } else if (ParallelGCThreads == 0) {
1253 jio_fprintf(defaultStream::error_stream(),
1254 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1255 vm_exit(1);
1256 }
1257
1258 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1259 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1260 // we set them to 1024 and 1024.
1261 // See CR 6362902.
1262 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1263 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1264 }
1265 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1266 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1267 }
1268
1269 // When using compressed oops, we use local overflow stacks,
1270 // rather than using a global overflow list chained through
1271 // the klass word of the object's pre-image.
1272 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1273 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1274 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1275 }
1276 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1277 }
1278 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1279 }
1280
1281 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1282 // sparc/solaris for certain applications, but would gain from
1283 // further optimization and tuning efforts, and would almost
1284 // certainly gain from analysis of platform and environment.
1285 void Arguments::set_cms_and_parnew_gc_flags() {
1286 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1287 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1288 assert(UseParNewGC, "ParNew should always be used with CMS");
1289
1290 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1291 disable_adaptive_size_policy("UseConcMarkSweepGC");
1292
1293 set_parnew_gc_flags();
1294
1295 size_t max_heap = align_size_down(MaxHeapSize,
1296 CardTableRS::ct_max_alignment_constraint());
1297
1298 // Now make adjustments for CMS
1299 intx tenuring_default = (intx)6;
1300 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1301
1302 // Preferred young gen size for "short" pauses:
1303 // upper bound depends on # of threads and NewRatio.
1304 const size_t preferred_max_new_size_unaligned =
1305 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1306 size_t preferred_max_new_size =
1307 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1308
1309 // Unless explicitly requested otherwise, size young gen
1310 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1311
1312 // If either MaxNewSize or NewRatio is set on the command line,
1313 // assume the user is trying to set the size of the young gen.
1314 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1315
1316 // Set MaxNewSize to our calculated preferred_max_new_size unless
1317 // NewSize was set on the command line and it is larger than
1318 // preferred_max_new_size.
1319 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1320 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1321 } else {
1322 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1323 }
1324 if (PrintGCDetails && Verbose) {
1325 // Too early to use gclog_or_tty
1326 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1327 }
1328
1329 // Code along this path potentially sets NewSize and OldSize
1330 if (PrintGCDetails && Verbose) {
1331 // Too early to use gclog_or_tty
1332 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1333 " initial_heap_size: " SIZE_FORMAT
1334 " max_heap: " SIZE_FORMAT,
1335 min_heap_size(), InitialHeapSize, max_heap);
1336 }
1337 size_t min_new = preferred_max_new_size;
1338 if (FLAG_IS_CMDLINE(NewSize)) {
1339 min_new = NewSize;
1340 }
1341 if (max_heap > min_new && min_heap_size() > min_new) {
1342 // Unless explicitly requested otherwise, make young gen
1343 // at least min_new, and at most preferred_max_new_size.
1344 if (FLAG_IS_DEFAULT(NewSize)) {
1345 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1346 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1347 if (PrintGCDetails && Verbose) {
1348 // Too early to use gclog_or_tty
1349 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1350 }
1351 }
1352 // Unless explicitly requested otherwise, size old gen
1353 // so it's NewRatio x of NewSize.
1354 if (FLAG_IS_DEFAULT(OldSize)) {
1355 if (max_heap > NewSize) {
1356 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1357 if (PrintGCDetails && Verbose) {
1358 // Too early to use gclog_or_tty
1359 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1360 }
1361 }
1362 }
1363 }
1364 }
1365 // Unless explicitly requested otherwise, definitely
1366 // promote all objects surviving "tenuring_default" scavenges.
1367 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1368 FLAG_IS_DEFAULT(SurvivorRatio)) {
1369 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1370 }
1371 // If we decided above (or user explicitly requested)
1372 // `promote all' (via MaxTenuringThreshold := 0),
1373 // prefer minuscule survivor spaces so as not to waste
1374 // space for (non-existent) survivors
1375 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1376 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1377 }
1378
1379 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1380 // but rather the number of free blocks of a given size that are used when
1381 // replenishing the local per-worker free list caches.
1382 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1383 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1384 // OldPLAB sizing manually turned off: Use a larger default setting,
1385 // unless it was manually specified. This is because a too-low value
1386 // will slow down scavenges.
1387 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1388 } else {
1389 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1390 }
1391 }
1392
1393 // If either of the static initialization defaults have changed, note this
1394 // modification.
1395 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1396 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1397 }
1398
1399 if (!ClassUnloading) {
1400 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1401 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1402 }
1403
1404 if (PrintGCDetails && Verbose) {
1405 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1406 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1407 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1408 }
1409 }
1410 #endif // INCLUDE_ALL_GCS
1411
1412 void set_object_alignment() {
1413 // Object alignment.
1414 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1415 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1416 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1417 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1418 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1419 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1420
1421 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1422 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1423
1424 // Oop encoding heap max
1425 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1426
1427 if (SurvivorAlignmentInBytes == 0) {
1428 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1429 }
1430
1431 #if INCLUDE_ALL_GCS
1432 // Set CMS global values
1433 CompactibleFreeListSpace::set_cms_values();
1434 #endif // INCLUDE_ALL_GCS
1435 }
1436
1437 size_t Arguments::max_heap_for_compressed_oops() {
1438 // Avoid sign flip.
1439 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1440 // We need to fit both the NULL page and the heap into the memory budget, while
1441 // keeping alignment constraints of the heap. To guarantee the latter, as the
1442 // NULL page is located before the heap, we pad the NULL page to the conservative
1443 // maximum alignment that the GC may ever impose upon the heap.
1444 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1445 _conservative_max_heap_alignment);
1446
1447 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1448 NOT_LP64(ShouldNotReachHere(); return 0);
1449 }
1450
1451 bool Arguments::should_auto_select_low_pause_collector() {
1452 if (UseAutoGCSelectPolicy &&
1453 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1454 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1455 if (PrintGCDetails) {
1456 // Cannot use gclog_or_tty yet.
1457 tty->print_cr("Automatic selection of the low pause collector"
1458 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1459 }
1460 return true;
1461 }
1462 return false;
1463 }
1464
1465 void Arguments::set_use_compressed_oops() {
1466 #ifndef ZERO
1467 #ifdef _LP64
1468 // MaxHeapSize is not set up properly at this point, but
1469 // the only value that can override MaxHeapSize if we are
1470 // to use UseCompressedOops is InitialHeapSize.
1471 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1472
1473 if (max_heap_size <= max_heap_for_compressed_oops()) {
1474 #if !defined(COMPILER1) || defined(TIERED)
1475 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1476 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1477 }
1478 #endif
1479 } else {
1480 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1481 warning("Max heap size too large for Compressed Oops");
1482 FLAG_SET_DEFAULT(UseCompressedOops, false);
1483 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1484 }
1485 }
1486 #endif // _LP64
1487 #endif // ZERO
1488 }
1489
1490
1491 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1492 // set_use_compressed_oops().
1493 void Arguments::set_use_compressed_klass_ptrs() {
1494 #ifndef ZERO
1495 #ifdef _LP64
1496 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1497 if (!UseCompressedOops) {
1498 if (UseCompressedClassPointers) {
1499 warning("UseCompressedClassPointers requires UseCompressedOops");
1500 }
1501 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1502 } else {
1503 // Turn on UseCompressedClassPointers too
1504 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1505 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1506 }
1507 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1508 if (UseCompressedClassPointers) {
1509 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1510 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1511 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1512 }
1513 }
1514 }
1515 #endif // _LP64
1516 #endif // !ZERO
1517 }
1518
1519 void Arguments::set_conservative_max_heap_alignment() {
1520 // The conservative maximum required alignment for the heap is the maximum of
1521 // the alignments imposed by several sources: any requirements from the heap
1522 // itself, the collector policy and the maximum page size we may run the VM
1523 // with.
1524 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1525 #if INCLUDE_ALL_GCS
1526 if (UseParallelGC) {
1527 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1528 } else if (UseG1GC) {
1529 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1530 }
1531 #endif // INCLUDE_ALL_GCS
1532 _conservative_max_heap_alignment = MAX4(heap_alignment,
1533 (size_t)os::vm_allocation_granularity(),
1534 os::max_page_size(),
1535 CollectorPolicy::compute_heap_alignment());
1536 }
1537
1538 void Arguments::select_gc_ergonomically() {
1539 if (os::is_server_class_machine()) {
1540 if (should_auto_select_low_pause_collector()) {
1541 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1542 } else {
1543 #if defined(JAVASE_EMBEDDED)
1544 FLAG_SET_ERGO(bool, UseParallelGC, true);
1545 #else
1546 FLAG_SET_ERGO(bool, UseG1GC, true);
1547 #endif
1548 }
1549 } else {
1550 FLAG_SET_ERGO(bool, UseSerialGC, true);
1551 }
1552 }
1553
1554 void Arguments::select_gc() {
1555 if (!gc_selected()) {
1556 select_gc_ergonomically();
1557 guarantee(gc_selected(), "No GC selected");
1558 }
1559 }
1560
1561 void Arguments::set_ergonomics_flags() {
1562 select_gc();
1563
1564 #ifdef COMPILER2
1565 // Shared spaces work fine with other GCs but causes bytecode rewriting
1566 // to be disabled, which hurts interpreter performance and decreases
1567 // server performance. When -server is specified, keep the default off
1568 // unless it is asked for. Future work: either add bytecode rewriting
1569 // at link time, or rewrite bytecodes in non-shared methods.
1570 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1571 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1572 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1573 }
1574 #endif
1575
1576 set_conservative_max_heap_alignment();
1577
1578 #ifndef ZERO
1579 #ifdef _LP64
1580 set_use_compressed_oops();
1581
1582 // set_use_compressed_klass_ptrs() must be called after calling
1583 // set_use_compressed_oops().
1584 set_use_compressed_klass_ptrs();
1585
1586 // Also checks that certain machines are slower with compressed oops
1587 // in vm_version initialization code.
1588 #endif // _LP64
1589 #endif // !ZERO
1590
1591 // Set up runtime image flags.
1592 set_runtime_image_flags();
1593
1594 CodeCacheExtensions::set_ergonomics_flags();
1595 }
1596
1597 void Arguments::set_parallel_gc_flags() {
1598 assert(UseParallelGC || UseParallelOldGC, "Error");
1599 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1600 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1601 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1602 }
1603 FLAG_SET_DEFAULT(UseParallelGC, true);
1604
1605 // If no heap maximum was requested explicitly, use some reasonable fraction
1606 // of the physical memory, up to a maximum of 1GB.
1607 FLAG_SET_DEFAULT(ParallelGCThreads,
1608 Abstract_VM_Version::parallel_worker_threads());
1609 if (ParallelGCThreads == 0) {
1610 jio_fprintf(defaultStream::error_stream(),
1611 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1612 vm_exit(1);
1613 }
1614
1615 if (UseAdaptiveSizePolicy) {
1616 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1617 // unless the user actually sets these flags.
1618 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1619 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1620 _min_heap_free_ratio = MinHeapFreeRatio;
1621 }
1622 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1623 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1624 _max_heap_free_ratio = MaxHeapFreeRatio;
1625 }
1626 }
1627
1628 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1629 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1630 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1631 // See CR 6362902 for details.
1632 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1633 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1634 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1635 }
1636 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1637 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1638 }
1639 }
1640
1641 if (UseParallelOldGC) {
1642 // Par compact uses lower default values since they are treated as
1643 // minimums. These are different defaults because of the different
1644 // interpretation and are not ergonomically set.
1645 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1646 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1647 }
1648 }
1649 }
1650
1651 void Arguments::set_g1_gc_flags() {
1652 assert(UseG1GC, "Error");
1653 #ifdef COMPILER1
1654 FastTLABRefill = false;
1655 #endif
1656 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1657 if (ParallelGCThreads == 0) {
1658 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1659 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1660 }
1661
1662 #if INCLUDE_ALL_GCS
1663 if (G1ConcRefinementThreads == 0) {
1664 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1665 }
1666 #endif
1667
1668 // MarkStackSize will be set (if it hasn't been set by the user)
1669 // when concurrent marking is initialized.
1670 // Its value will be based upon the number of parallel marking threads.
1671 // But we do set the maximum mark stack size here.
1672 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1673 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1674 }
1675
1676 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1677 // In G1, we want the default GC overhead goal to be higher than
1678 // say in PS. So we set it here to 10%. Otherwise the heap might
1679 // be expanded more aggressively than we would like it to. In
1680 // fact, even 10% seems to not be high enough in some cases
1681 // (especially small GC stress tests that the main thing they do
1682 // is allocation). We might consider increase it further.
1683 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1684 }
1685
1686 if (PrintGCDetails && Verbose) {
1687 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1688 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1689 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1690 }
1691 }
1692
1693 #if !INCLUDE_ALL_GCS
1694 #ifdef ASSERT
1695 static bool verify_serial_gc_flags() {
1696 return (UseSerialGC &&
1697 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1698 UseParallelGC || UseParallelOldGC));
1699 }
1700 #endif // ASSERT
1701 #endif // INCLUDE_ALL_GCS
1702
1703 void Arguments::set_gc_specific_flags() {
1704 #if INCLUDE_ALL_GCS
1705 // Set per-collector flags
1706 if (UseParallelGC || UseParallelOldGC) {
1707 set_parallel_gc_flags();
1708 } else if (UseConcMarkSweepGC) {
1709 set_cms_and_parnew_gc_flags();
1710 } else if (UseG1GC) {
1711 set_g1_gc_flags();
1712 }
1713 check_deprecated_gc_flags();
1714 if (AssumeMP && !UseSerialGC) {
1715 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1716 warning("If the number of processors is expected to increase from one, then"
1717 " you should configure the number of parallel GC threads appropriately"
1718 " using -XX:ParallelGCThreads=N");
1719 }
1720 }
1721 if (MinHeapFreeRatio == 100) {
1722 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1723 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1724 }
1725 #else // INCLUDE_ALL_GCS
1726 assert(verify_serial_gc_flags(), "SerialGC unset");
1727 #endif // INCLUDE_ALL_GCS
1728 }
1729
1730 julong Arguments::limit_by_allocatable_memory(julong limit) {
1731 julong max_allocatable;
1732 julong result = limit;
1733 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1734 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1735 }
1736 return result;
1737 }
1738
1739 // Use static initialization to get the default before parsing
1740 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1741
1742 void Arguments::set_heap_size() {
1743 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1744 // Deprecated flag
1745 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1746 }
1747
1748 const julong phys_mem =
1749 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1750 : (julong)MaxRAM;
1751
1752 // If the maximum heap size has not been set with -Xmx,
1753 // then set it as fraction of the size of physical memory,
1754 // respecting the maximum and minimum sizes of the heap.
1755 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1756 julong reasonable_max = phys_mem / MaxRAMFraction;
1757
1758 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1759 // Small physical memory, so use a minimum fraction of it for the heap
1760 reasonable_max = phys_mem / MinRAMFraction;
1761 } else {
1762 // Not-small physical memory, so require a heap at least
1763 // as large as MaxHeapSize
1764 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1765 }
1766 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1767 // Limit the heap size to ErgoHeapSizeLimit
1768 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1769 }
1770 if (UseCompressedOops) {
1771 // Limit the heap size to the maximum possible when using compressed oops
1772 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1773
1774 // HeapBaseMinAddress can be greater than default but not less than.
1775 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1776 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1777 // matches compressed oops printing flags
1778 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1779 jio_fprintf(defaultStream::error_stream(),
1780 "HeapBaseMinAddress must be at least " SIZE_FORMAT
1781 " (" SIZE_FORMAT "G) which is greater than value given "
1782 SIZE_FORMAT "\n",
1783 DefaultHeapBaseMinAddress,
1784 DefaultHeapBaseMinAddress/G,
1785 HeapBaseMinAddress);
1786 }
1787 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1788 }
1789 }
1790
1791 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1792 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1793 // but it should be not less than default MaxHeapSize.
1794 max_coop_heap -= HeapBaseMinAddress;
1795 }
1796 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1797 }
1798 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1799
1800 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1801 // An initial heap size was specified on the command line,
1802 // so be sure that the maximum size is consistent. Done
1803 // after call to limit_by_allocatable_memory because that
1804 // method might reduce the allocation size.
1805 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1806 }
1807
1808 if (PrintGCDetails && Verbose) {
1809 // Cannot use gclog_or_tty yet.
1810 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1811 }
1812 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1813 }
1814
1815 // If the minimum or initial heap_size have not been set or requested to be set
1816 // ergonomically, set them accordingly.
1817 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1818 julong reasonable_minimum = (julong)(OldSize + NewSize);
1819
1820 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1821
1822 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1823
1824 if (InitialHeapSize == 0) {
1825 julong reasonable_initial = phys_mem / InitialRAMFraction;
1826
1827 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1828 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1829
1830 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1831
1832 if (PrintGCDetails && Verbose) {
1833 // Cannot use gclog_or_tty yet.
1834 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1835 }
1836 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1837 }
1838 // If the minimum heap size has not been set (via -Xms),
1839 // synchronize with InitialHeapSize to avoid errors with the default value.
1840 if (min_heap_size() == 0) {
1841 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1842 if (PrintGCDetails && Verbose) {
1843 // Cannot use gclog_or_tty yet.
1844 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1845 }
1846 }
1847 }
1848 }
1849
1850 // Set up runtime image flags
1851 void Arguments::set_runtime_image_flags() {
1852 #ifdef _LP64
1853 // Memory map image file by default on 64 bit machines.
1854 if (FLAG_IS_DEFAULT(MemoryMapImage)) {
1855 FLAG_SET_ERGO(bool, MemoryMapImage, true);
1856 }
1857 #endif
1858 }
1859
1860 // This must be called after ergonomics.
1861 void Arguments::set_bytecode_flags() {
1862 if (!RewriteBytecodes) {
1863 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1864 }
1865 }
1866
1867 // Aggressive optimization flags -XX:+AggressiveOpts
1868 void Arguments::set_aggressive_opts_flags() {
1869 #ifdef COMPILER2
1870 if (AggressiveUnboxing) {
1871 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1872 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1873 } else if (!EliminateAutoBox) {
1874 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1875 AggressiveUnboxing = false;
1876 }
1877 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1878 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1879 } else if (!DoEscapeAnalysis) {
1880 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1881 AggressiveUnboxing = false;
1882 }
1883 }
1884 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1885 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1886 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1887 }
1888 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1889 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1890 }
1891
1892 // Feed the cache size setting into the JDK
1893 char buffer[1024];
1894 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1895 add_property(buffer);
1896 }
1897 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1898 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1899 }
1900 #endif
1901
1902 if (AggressiveOpts) {
1903 // Sample flag setting code
1904 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1905 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1906 // }
1907 }
1908 }
1909
1910 //===========================================================================================================
1911 // Parsing of java.compiler property
1912
1913 void Arguments::process_java_compiler_argument(char* arg) {
1914 // For backwards compatibility, Djava.compiler=NONE or ""
1915 // causes us to switch to -Xint mode UNLESS -Xdebug
1916 // is also specified.
1917 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1918 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1919 }
1920 }
1921
1922 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1923 _sun_java_launcher = os::strdup_check_oom(launcher);
1924 }
1925
1926 bool Arguments::created_by_java_launcher() {
1927 assert(_sun_java_launcher != NULL, "property must have value");
1928 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1929 }
1930
1931 bool Arguments::sun_java_launcher_is_altjvm() {
1932 return _sun_java_launcher_is_altjvm;
1933 }
1934
1935 //===========================================================================================================
1936 // Parsing of main arguments
1937
1938 // check if do gclog rotation
1939 // +UseGCLogFileRotation is a must,
1940 // no gc log rotation when log file not supplied or
1941 // NumberOfGCLogFiles is 0
1942 void check_gclog_consistency() {
1943 if (UseGCLogFileRotation) {
1944 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1945 jio_fprintf(defaultStream::output_stream(),
1946 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1947 "where num_of_file > 0\n"
1948 "GC log rotation is turned off\n");
1949 UseGCLogFileRotation = false;
1950 }
1951 }
1952
1953 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1954 if (FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K) == Flag::SUCCESS) {
1955 jio_fprintf(defaultStream::output_stream(),
1956 "GCLogFileSize changed to minimum 8K\n");
1957 }
1958 }
1959 }
1960
1961 // This function is called for -Xloggc:<filename>, it can be used
1962 // to check if a given file name(or string) conforms to the following
1963 // specification:
1964 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1965 // %p and %t only allowed once. We only limit usage of filename not path
1966 bool is_filename_valid(const char *file_name) {
1967 const char* p = file_name;
1968 char file_sep = os::file_separator()[0];
1969 const char* cp;
1970 // skip prefix path
1971 for (cp = file_name; *cp != '\0'; cp++) {
1972 if (*cp == '/' || *cp == file_sep) {
1973 p = cp + 1;
1974 }
1975 }
1976
1977 int count_p = 0;
1978 int count_t = 0;
1979 while (*p != '\0') {
1980 if ((*p >= '0' && *p <= '9') ||
1981 (*p >= 'A' && *p <= 'Z') ||
1982 (*p >= 'a' && *p <= 'z') ||
1983 *p == '-' ||
1984 *p == '_' ||
1985 *p == '.') {
1986 p++;
1987 continue;
1988 }
1989 if (*p == '%') {
1990 if(*(p + 1) == 'p') {
1991 p += 2;
1992 count_p ++;
1993 continue;
1994 }
1995 if (*(p + 1) == 't') {
1996 p += 2;
1997 count_t ++;
1998 continue;
1999 }
2000 }
2001 return false;
2002 }
2003 return count_p < 2 && count_t < 2;
2004 }
2005
2006 // Check consistency of GC selection
2007 bool Arguments::check_gc_consistency() {
2008 check_gclog_consistency();
2009 // Ensure that the user has not selected conflicting sets
2010 // of collectors.
2011 uint i = 0;
2012 if (UseSerialGC) i++;
2013 if (UseConcMarkSweepGC) i++;
2014 if (UseParallelGC || UseParallelOldGC) i++;
2015 if (UseG1GC) i++;
2016 if (i > 1) {
2017 jio_fprintf(defaultStream::error_stream(),
2018 "Conflicting collector combinations in option list; "
2019 "please refer to the release notes for the combinations "
2020 "allowed\n");
2021 return false;
2022 }
2023
2024 if (UseConcMarkSweepGC && !UseParNewGC) {
2025 jio_fprintf(defaultStream::error_stream(),
2026 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2027 return false;
2028 }
2029
2030 if (UseParNewGC && !UseConcMarkSweepGC) {
2031 jio_fprintf(defaultStream::error_stream(),
2032 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2033 return false;
2034 }
2035
2036 return true;
2037 }
2038
2039 void Arguments::check_deprecated_gc_flags() {
2040 if (FLAG_IS_CMDLINE(UseParNewGC)) {
2041 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2042 }
2043 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2044 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2045 "and will likely be removed in future release");
2046 }
2047 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2048 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2049 "Use MaxRAMFraction instead.");
2050 }
2051 }
2052
2053 // Check the consistency of vm_init_args
2054 bool Arguments::check_vm_args_consistency() {
2055 // Method for adding checks for flag consistency.
2056 // The intent is to warn the user of all possible conflicts,
2057 // before returning an error.
2058 // Note: Needs platform-dependent factoring.
2059 bool status = true;
2060
2061 if (TLABRefillWasteFraction == 0) {
2062 jio_fprintf(defaultStream::error_stream(),
2063 "TLABRefillWasteFraction should be a denominator, "
2064 "not " SIZE_FORMAT "\n",
2065 TLABRefillWasteFraction);
2066 status = false;
2067 }
2068
2069 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2070 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2071 }
2072
2073 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2074 // Settings to encourage splitting.
2075 if (!FLAG_IS_CMDLINE(NewRatio)) {
2076 if (FLAG_SET_CMDLINE(uintx, NewRatio, 2) != Flag::SUCCESS) {
2077 status = false;
2078 }
2079 }
2080 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2081 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2082 status = false;
2083 }
2084 }
2085 }
2086
2087 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2088 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2089 }
2090
2091 if (GCTimeLimit == 100) {
2092 // Turn off gc-overhead-limit-exceeded checks
2093 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2094 }
2095
2096 status = status && check_gc_consistency();
2097
2098 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2099 // insists that we hold the requisite locks so that the iteration is
2100 // MT-safe. For the verification at start-up and shut-down, we don't
2101 // yet have a good way of acquiring and releasing these locks,
2102 // which are not visible at the CollectedHeap level. We want to
2103 // be able to acquire these locks and then do the iteration rather
2104 // than just disable the lock verification. This will be fixed under
2105 // bug 4788986.
2106 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2107 if (VerifyDuringStartup) {
2108 warning("Heap verification at start-up disabled "
2109 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2110 VerifyDuringStartup = false; // Disable verification at start-up
2111 }
2112
2113 if (VerifyBeforeExit) {
2114 warning("Heap verification at shutdown disabled "
2115 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2116 VerifyBeforeExit = false; // Disable verification at shutdown
2117 }
2118 }
2119
2120 // Note: only executed in non-PRODUCT mode
2121 if (!UseAsyncConcMarkSweepGC &&
2122 (ExplicitGCInvokesConcurrent ||
2123 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2124 jio_fprintf(defaultStream::error_stream(),
2125 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2126 " with -UseAsyncConcMarkSweepGC");
2127 status = false;
2128 }
2129
2130 if (PrintNMTStatistics) {
2131 #if INCLUDE_NMT
2132 if (MemTracker::tracking_level() == NMT_off) {
2133 #endif // INCLUDE_NMT
2134 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2135 PrintNMTStatistics = false;
2136 #if INCLUDE_NMT
2137 }
2138 #endif
2139 }
2140
2141 // Check lower bounds of the code cache
2142 // Template Interpreter code is approximately 3X larger in debug builds.
2143 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2144 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2145 jio_fprintf(defaultStream::error_stream(),
2146 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2147 os::vm_page_size()/K);
2148 status = false;
2149 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2150 jio_fprintf(defaultStream::error_stream(),
2151 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2152 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2153 status = false;
2154 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2155 jio_fprintf(defaultStream::error_stream(),
2156 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2157 min_code_cache_size/K);
2158 status = false;
2159 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2160 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2161 jio_fprintf(defaultStream::error_stream(),
2162 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2163 CODE_CACHE_SIZE_LIMIT/M);
2164 status = false;
2165 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2166 jio_fprintf(defaultStream::error_stream(),
2167 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2168 min_code_cache_size/K);
2169 status = false;
2170 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2171 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2172 jio_fprintf(defaultStream::error_stream(),
2173 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2174 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2175 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2176 status = false;
2177 }
2178
2179 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2180 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2181 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2182
2183 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2184 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2185 }
2186
2187 return status;
2188 }
2189
2190 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2191 const char* option_type) {
2192 if (ignore) return false;
2193
2194 const char* spacer = " ";
2195 if (option_type == NULL) {
2196 option_type = ++spacer; // Set both to the empty string.
2197 }
2198
2199 if (os::obsolete_option(option)) {
2200 jio_fprintf(defaultStream::error_stream(),
2201 "Obsolete %s%soption: %s\n", option_type, spacer,
2202 option->optionString);
2203 return false;
2204 } else {
2205 jio_fprintf(defaultStream::error_stream(),
2206 "Unrecognized %s%soption: %s\n", option_type, spacer,
2207 option->optionString);
2208 return true;
2209 }
2210 }
2211
2212 static const char* user_assertion_options[] = {
2213 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2214 };
2215
2216 static const char* system_assertion_options[] = {
2217 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2218 };
2219
2220 bool Arguments::parse_uintx(const char* value,
2221 uintx* uintx_arg,
2222 uintx min_size) {
2223
2224 // Check the sign first since atomull() parses only unsigned values.
2225 bool value_is_positive = !(*value == '-');
2226
2227 if (value_is_positive) {
2228 julong n;
2229 bool good_return = atomull(value, &n);
2230 if (good_return) {
2231 bool above_minimum = n >= min_size;
2232 bool value_is_too_large = n > max_uintx;
2233
2234 if (above_minimum && !value_is_too_large) {
2235 *uintx_arg = n;
2236 return true;
2237 }
2238 }
2239 }
2240 return false;
2241 }
2242
2243 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2244 julong* long_arg,
2245 julong min_size) {
2246 if (!atomull(s, long_arg)) return arg_unreadable;
2247 return check_memory_size(*long_arg, min_size);
2248 }
2249
2250 // Parse JavaVMInitArgs structure
2251
2252 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2253 // For components of the system classpath.
2254 SysClassPath scp(Arguments::get_sysclasspath());
2255 bool scp_assembly_required = false;
2256
2257 // Save default settings for some mode flags
2258 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2259 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2260 Arguments::_ClipInlining = ClipInlining;
2261 Arguments::_BackgroundCompilation = BackgroundCompilation;
2262 if (TieredCompilation) {
2263 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2264 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2265 }
2266
2267 // Setup flags for mixed which is the default
2268 set_mode_flags(_mixed);
2269
2270 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2271 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2272 if (result != JNI_OK) {
2273 return result;
2274 }
2275
2276 // Parse JavaVMInitArgs structure passed in
2277 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2278 if (result != JNI_OK) {
2279 return result;
2280 }
2281
2282 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2283 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2284 if (result != JNI_OK) {
2285 return result;
2286 }
2287
2288 // Do final processing now that all arguments have been parsed
2289 result = finalize_vm_init_args(&scp, scp_assembly_required);
2290 if (result != JNI_OK) {
2291 return result;
2292 }
2293
2294 return JNI_OK;
2295 }
2296
2297 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2298 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2299 // are dealing with -agentpath (case where name is a path), otherwise with
2300 // -agentlib
2301 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2302 char *_name;
2303 const char *_hprof = "hprof", *_jdwp = "jdwp";
2304 size_t _len_hprof, _len_jdwp, _len_prefix;
2305
2306 if (is_path) {
2307 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2308 return false;
2309 }
2310
2311 _name++; // skip past last path separator
2312 _len_prefix = strlen(JNI_LIB_PREFIX);
2313
2314 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2315 return false;
2316 }
2317
2318 _name += _len_prefix;
2319 _len_hprof = strlen(_hprof);
2320 _len_jdwp = strlen(_jdwp);
2321
2322 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2323 _name += _len_hprof;
2324 }
2325 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2326 _name += _len_jdwp;
2327 }
2328 else {
2329 return false;
2330 }
2331
2332 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2333 return false;
2334 }
2335
2336 return true;
2337 }
2338
2339 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2340 return true;
2341 }
2342
2343 return false;
2344 }
2345
2346 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2347 SysClassPath* scp_p,
2348 bool* scp_assembly_required_p,
2349 Flag::Flags origin) {
2350 // Remaining part of option string
2351 const char* tail;
2352
2353 // iterate over arguments
2354 for (int index = 0; index < args->nOptions; index++) {
2355 bool is_absolute_path = false; // for -agentpath vs -agentlib
2356
2357 const JavaVMOption* option = args->options + index;
2358
2359 if (!match_option(option, "-Djava.class.path", &tail) &&
2360 !match_option(option, "-Dsun.java.command", &tail) &&
2361 !match_option(option, "-Dsun.java.launcher", &tail)) {
2362
2363 // add all jvm options to the jvm_args string. This string
2364 // is used later to set the java.vm.args PerfData string constant.
2365 // the -Djava.class.path and the -Dsun.java.command options are
2366 // omitted from jvm_args string as each have their own PerfData
2367 // string constant object.
2368 build_jvm_args(option->optionString);
2369 }
2370
2371 // -verbose:[class/gc/jni]
2372 if (match_option(option, "-verbose", &tail)) {
2373 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2374 if (FLAG_SET_CMDLINE(bool, TraceClassLoading, true) != Flag::SUCCESS) {
2375 return JNI_EINVAL;
2376 }
2377 if (FLAG_SET_CMDLINE(bool, TraceClassUnloading, true) != Flag::SUCCESS) {
2378 return JNI_EINVAL;
2379 }
2380 } else if (!strcmp(tail, ":gc")) {
2381 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
2382 return JNI_EINVAL;
2383 }
2384 } else if (!strcmp(tail, ":jni")) {
2385 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2386 return JNI_EINVAL;
2387 }
2388 }
2389 // -da / -ea / -disableassertions / -enableassertions
2390 // These accept an optional class/package name separated by a colon, e.g.,
2391 // -da:java.lang.Thread.
2392 } else if (match_option(option, user_assertion_options, &tail, true)) {
2393 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2394 if (*tail == '\0') {
2395 JavaAssertions::setUserClassDefault(enable);
2396 } else {
2397 assert(*tail == ':', "bogus match by match_option()");
2398 JavaAssertions::addOption(tail + 1, enable);
2399 }
2400 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2401 } else if (match_option(option, system_assertion_options, &tail, false)) {
2402 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2403 JavaAssertions::setSystemClassDefault(enable);
2404 // -bootclasspath:
2405 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2406 scp_p->reset_path(tail);
2407 *scp_assembly_required_p = true;
2408 // -bootclasspath/a:
2409 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2410 scp_p->add_suffix(tail);
2411 *scp_assembly_required_p = true;
2412 // -bootclasspath/p:
2413 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2414 scp_p->add_prefix(tail);
2415 *scp_assembly_required_p = true;
2416 // -Xrun
2417 } else if (match_option(option, "-Xrun", &tail)) {
2418 if (tail != NULL) {
2419 const char* pos = strchr(tail, ':');
2420 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2421 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2422 name[len] = '\0';
2423
2424 char *options = NULL;
2425 if(pos != NULL) {
2426 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2427 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2428 }
2429 #if !INCLUDE_JVMTI
2430 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2431 jio_fprintf(defaultStream::error_stream(),
2432 "Profiling and debugging agents are not supported in this VM\n");
2433 return JNI_ERR;
2434 }
2435 #endif // !INCLUDE_JVMTI
2436 add_init_library(name, options);
2437 }
2438 // -agentlib and -agentpath
2439 } else if (match_option(option, "-agentlib:", &tail) ||
2440 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2441 if(tail != NULL) {
2442 const char* pos = strchr(tail, '=');
2443 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2444 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2445 name[len] = '\0';
2446
2447 char *options = NULL;
2448 if(pos != NULL) {
2449 options = os::strdup_check_oom(pos + 1, mtInternal);
2450 }
2451 #if !INCLUDE_JVMTI
2452 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2453 jio_fprintf(defaultStream::error_stream(),
2454 "Profiling and debugging agents are not supported in this VM\n");
2455 return JNI_ERR;
2456 }
2457 #endif // !INCLUDE_JVMTI
2458 add_init_agent(name, options, is_absolute_path);
2459 }
2460 // -javaagent
2461 } else if (match_option(option, "-javaagent:", &tail)) {
2462 #if !INCLUDE_JVMTI
2463 jio_fprintf(defaultStream::error_stream(),
2464 "Instrumentation agents are not supported in this VM\n");
2465 return JNI_ERR;
2466 #else
2467 if(tail != NULL) {
2468 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2469 add_init_agent("instrument", options, false);
2470 }
2471 #endif // !INCLUDE_JVMTI
2472 // -Xnoclassgc
2473 } else if (match_option(option, "-Xnoclassgc")) {
2474 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2475 return JNI_EINVAL;
2476 }
2477 // -Xconcgc
2478 } else if (match_option(option, "-Xconcgc")) {
2479 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2480 return JNI_EINVAL;
2481 }
2482 // -Xnoconcgc
2483 } else if (match_option(option, "-Xnoconcgc")) {
2484 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2485 return JNI_EINVAL;
2486 }
2487 // -Xbatch
2488 } else if (match_option(option, "-Xbatch")) {
2489 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2490 return JNI_EINVAL;
2491 }
2492 // -Xmn for compatibility with other JVM vendors
2493 } else if (match_option(option, "-Xmn", &tail)) {
2494 julong long_initial_young_size = 0;
2495 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2496 if (errcode != arg_in_range) {
2497 jio_fprintf(defaultStream::error_stream(),
2498 "Invalid initial young generation size: %s\n", option->optionString);
2499 describe_range_error(errcode);
2500 return JNI_EINVAL;
2501 }
2502 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2503 return JNI_EINVAL;
2504 }
2505 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2506 return JNI_EINVAL;
2507 }
2508 // -Xms
2509 } else if (match_option(option, "-Xms", &tail)) {
2510 julong long_initial_heap_size = 0;
2511 // an initial heap size of 0 means automatically determine
2512 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2513 if (errcode != arg_in_range) {
2514 jio_fprintf(defaultStream::error_stream(),
2515 "Invalid initial heap size: %s\n", option->optionString);
2516 describe_range_error(errcode);
2517 return JNI_EINVAL;
2518 }
2519 set_min_heap_size((size_t)long_initial_heap_size);
2520 // Currently the minimum size and the initial heap sizes are the same.
2521 // Can be overridden with -XX:InitialHeapSize.
2522 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2523 return JNI_EINVAL;
2524 }
2525 // -Xmx
2526 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2527 julong long_max_heap_size = 0;
2528 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2529 if (errcode != arg_in_range) {
2530 jio_fprintf(defaultStream::error_stream(),
2531 "Invalid maximum heap size: %s\n", option->optionString);
2532 describe_range_error(errcode);
2533 return JNI_EINVAL;
2534 }
2535 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2536 return JNI_EINVAL;
2537 }
2538 // Xmaxf
2539 } else if (match_option(option, "-Xmaxf", &tail)) {
2540 char* err;
2541 int maxf = (int)(strtod(tail, &err) * 100);
2542 if (*err != '\0' || *tail == '\0') {
2543 jio_fprintf(defaultStream::error_stream(),
2544 "Bad max heap free percentage size: %s\n",
2545 option->optionString);
2546 return JNI_EINVAL;
2547 } else {
2548 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2549 return JNI_EINVAL;
2550 }
2551 }
2552 // Xminf
2553 } else if (match_option(option, "-Xminf", &tail)) {
2554 char* err;
2555 int minf = (int)(strtod(tail, &err) * 100);
2556 if (*err != '\0' || *tail == '\0') {
2557 jio_fprintf(defaultStream::error_stream(),
2558 "Bad min heap free percentage size: %s\n",
2559 option->optionString);
2560 return JNI_EINVAL;
2561 } else {
2562 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2563 return JNI_EINVAL;
2564 }
2565 }
2566 // -Xss
2567 } else if (match_option(option, "-Xss", &tail)) {
2568 julong long_ThreadStackSize = 0;
2569 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2570 if (errcode != arg_in_range) {
2571 jio_fprintf(defaultStream::error_stream(),
2572 "Invalid thread stack size: %s\n", option->optionString);
2573 describe_range_error(errcode);
2574 return JNI_EINVAL;
2575 }
2576 // Internally track ThreadStackSize in units of 1024 bytes.
2577 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2578 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2579 return JNI_EINVAL;
2580 }
2581 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads
2582 } else if (match_option(option, "-Xoss", &tail) ||
2583 match_option(option, "-Xsqnopause") ||
2584 match_option(option, "-Xoptimize") ||
2585 match_option(option, "-Xboundthreads")) {
2586 // All these options are deprecated in JDK 9 and will be removed in a future release
2587 char version[256];
2588 JDK_Version::jdk(9).to_string(version, sizeof(version));
2589 warning("ignoring option %s; support was removed in %s", option->optionString, version);
2590 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2591 julong long_CodeCacheExpansionSize = 0;
2592 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2593 if (errcode != arg_in_range) {
2594 jio_fprintf(defaultStream::error_stream(),
2595 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2596 os::vm_page_size()/K);
2597 return JNI_EINVAL;
2598 }
2599 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2600 return JNI_EINVAL;
2601 }
2602 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2603 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2604 julong long_ReservedCodeCacheSize = 0;
2605
2606 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2607 if (errcode != arg_in_range) {
2608 jio_fprintf(defaultStream::error_stream(),
2609 "Invalid maximum code cache size: %s.\n", option->optionString);
2610 return JNI_EINVAL;
2611 }
2612 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2613 return JNI_EINVAL;
2614 }
2615 // -XX:NonNMethodCodeHeapSize=
2616 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2617 julong long_NonNMethodCodeHeapSize = 0;
2618
2619 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2620 if (errcode != arg_in_range) {
2621 jio_fprintf(defaultStream::error_stream(),
2622 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2623 return JNI_EINVAL;
2624 }
2625 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2626 return JNI_EINVAL;
2627 }
2628 // -XX:ProfiledCodeHeapSize=
2629 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2630 julong long_ProfiledCodeHeapSize = 0;
2631
2632 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2633 if (errcode != arg_in_range) {
2634 jio_fprintf(defaultStream::error_stream(),
2635 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2636 return JNI_EINVAL;
2637 }
2638 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
2639 return JNI_EINVAL;
2640 }
2641 // -XX:NonProfiledCodeHeapSizee=
2642 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2643 julong long_NonProfiledCodeHeapSize = 0;
2644
2645 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2646 if (errcode != arg_in_range) {
2647 jio_fprintf(defaultStream::error_stream(),
2648 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2649 return JNI_EINVAL;
2650 }
2651 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
2652 return JNI_EINVAL;
2653 }
2654 // -green
2655 } else if (match_option(option, "-green")) {
2656 jio_fprintf(defaultStream::error_stream(),
2657 "Green threads support not available\n");
2658 return JNI_EINVAL;
2659 // -native
2660 } else if (match_option(option, "-native")) {
2661 // HotSpot always uses native threads, ignore silently for compatibility
2662 // -Xrs
2663 } else if (match_option(option, "-Xrs")) {
2664 // Classic/EVM option, new functionality
2665 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2666 return JNI_EINVAL;
2667 }
2668 } else if (match_option(option, "-Xusealtsigs")) {
2669 // change default internal VM signals used - lower case for back compat
2670 if (FLAG_SET_CMDLINE(bool, UseAltSigs, true) != Flag::SUCCESS) {
2671 return JNI_EINVAL;
2672 }
2673 // -Xprof
2674 } else if (match_option(option, "-Xprof")) {
2675 #if INCLUDE_FPROF
2676 _has_profile = true;
2677 #else // INCLUDE_FPROF
2678 jio_fprintf(defaultStream::error_stream(),
2679 "Flat profiling is not supported in this VM.\n");
2680 return JNI_ERR;
2681 #endif // INCLUDE_FPROF
2682 // -Xconcurrentio
2683 } else if (match_option(option, "-Xconcurrentio")) {
2684 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2685 return JNI_EINVAL;
2686 }
2687 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2688 return JNI_EINVAL;
2689 }
2690 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2691 return JNI_EINVAL;
2692 }
2693 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2694 return JNI_EINVAL;
2695 }
2696 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2697 return JNI_EINVAL;
2698 }
2699
2700 // -Xinternalversion
2701 } else if (match_option(option, "-Xinternalversion")) {
2702 jio_fprintf(defaultStream::output_stream(), "%s\n",
2703 VM_Version::internal_vm_info_string());
2704 vm_exit(0);
2705 #ifndef PRODUCT
2706 // -Xprintflags
2707 } else if (match_option(option, "-Xprintflags")) {
2708 CommandLineFlags::printFlags(tty, false);
2709 vm_exit(0);
2710 #endif
2711 // -D
2712 } else if (match_option(option, "-D", &tail)) {
2713 const char* value;
2714 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2715 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2716 // abort if -Djava.endorsed.dirs is set
2717 jio_fprintf(defaultStream::output_stream(),
2718 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2719 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2720 return JNI_EINVAL;
2721 }
2722 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2723 *value != '\0' && strcmp(value, "\"\"") != 0) {
2724 // abort if -Djava.ext.dirs is set
2725 jio_fprintf(defaultStream::output_stream(),
2726 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2727 return JNI_EINVAL;
2728 }
2729
2730 if (!add_property(tail)) {
2731 return JNI_ENOMEM;
2732 }
2733 // Out of the box management support
2734 if (match_option(option, "-Dcom.sun.management", &tail)) {
2735 #if INCLUDE_MANAGEMENT
2736 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
2737 return JNI_EINVAL;
2738 }
2739 #else
2740 jio_fprintf(defaultStream::output_stream(),
2741 "-Dcom.sun.management is not supported in this VM.\n");
2742 return JNI_ERR;
2743 #endif
2744 }
2745 // -Xint
2746 } else if (match_option(option, "-Xint")) {
2747 set_mode_flags(_int);
2748 // -Xmixed
2749 } else if (match_option(option, "-Xmixed")) {
2750 set_mode_flags(_mixed);
2751 // -Xcomp
2752 } else if (match_option(option, "-Xcomp")) {
2753 // for testing the compiler; turn off all flags that inhibit compilation
2754 set_mode_flags(_comp);
2755 // -Xshare:dump
2756 } else if (match_option(option, "-Xshare:dump")) {
2757 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
2758 return JNI_EINVAL;
2759 }
2760 set_mode_flags(_int); // Prevent compilation, which creates objects
2761 // -Xshare:on
2762 } else if (match_option(option, "-Xshare:on")) {
2763 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2764 return JNI_EINVAL;
2765 }
2766 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
2767 return JNI_EINVAL;
2768 }
2769 // -Xshare:auto
2770 } else if (match_option(option, "-Xshare:auto")) {
2771 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2772 return JNI_EINVAL;
2773 }
2774 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2775 return JNI_EINVAL;
2776 }
2777 // -Xshare:off
2778 } else if (match_option(option, "-Xshare:off")) {
2779 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
2780 return JNI_EINVAL;
2781 }
2782 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2783 return JNI_EINVAL;
2784 }
2785 // -Xverify
2786 } else if (match_option(option, "-Xverify", &tail)) {
2787 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2788 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
2789 return JNI_EINVAL;
2790 }
2791 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
2792 return JNI_EINVAL;
2793 }
2794 } else if (strcmp(tail, ":remote") == 0) {
2795 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
2796 return JNI_EINVAL;
2797 }
2798 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
2799 return JNI_EINVAL;
2800 }
2801 } else if (strcmp(tail, ":none") == 0) {
2802 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
2803 return JNI_EINVAL;
2804 }
2805 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
2806 return JNI_EINVAL;
2807 }
2808 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2809 return JNI_EINVAL;
2810 }
2811 // -Xdebug
2812 } else if (match_option(option, "-Xdebug")) {
2813 // note this flag has been used, then ignore
2814 set_xdebug_mode(true);
2815 // -Xnoagent
2816 } else if (match_option(option, "-Xnoagent")) {
2817 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2818 } else if (match_option(option, "-Xloggc:", &tail)) {
2819 // Redirect GC output to the file. -Xloggc:<filename>
2820 // ostream_init_log(), when called will use this filename
2821 // to initialize a fileStream.
2822 _gc_log_filename = os::strdup_check_oom(tail);
2823 if (!is_filename_valid(_gc_log_filename)) {
2824 jio_fprintf(defaultStream::output_stream(),
2825 "Invalid file name for use with -Xloggc: Filename can only contain the "
2826 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2827 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2828 return JNI_EINVAL;
2829 }
2830 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
2831 return JNI_EINVAL;
2832 }
2833 if (FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true) != Flag::SUCCESS) {
2834 return JNI_EINVAL;
2835 }
2836 // JNI hooks
2837 } else if (match_option(option, "-Xcheck", &tail)) {
2838 if (!strcmp(tail, ":jni")) {
2839 #if !INCLUDE_JNI_CHECK
2840 warning("JNI CHECKING is not supported in this VM");
2841 #else
2842 CheckJNICalls = true;
2843 #endif // INCLUDE_JNI_CHECK
2844 } else if (is_bad_option(option, args->ignoreUnrecognized,
2845 "check")) {
2846 return JNI_EINVAL;
2847 }
2848 } else if (match_option(option, "vfprintf")) {
2849 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2850 } else if (match_option(option, "exit")) {
2851 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2852 } else if (match_option(option, "abort")) {
2853 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2854 // -XX:+AggressiveHeap
2855 } else if (match_option(option, "-XX:+AggressiveHeap")) {
2856
2857 // This option inspects the machine and attempts to set various
2858 // parameters to be optimal for long-running, memory allocation
2859 // intensive jobs. It is intended for machines with large
2860 // amounts of cpu and memory.
2861
2862 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2863 // VM, but we may not be able to represent the total physical memory
2864 // available (like having 8gb of memory on a box but using a 32bit VM).
2865 // Thus, we need to make sure we're using a julong for intermediate
2866 // calculations.
2867 julong initHeapSize;
2868 julong total_memory = os::physical_memory();
2869
2870 if (total_memory < (julong)256*M) {
2871 jio_fprintf(defaultStream::error_stream(),
2872 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2873 vm_exit(1);
2874 }
2875
2876 // The heap size is half of available memory, or (at most)
2877 // all of possible memory less 160mb (leaving room for the OS
2878 // when using ISM). This is the maximum; because adaptive sizing
2879 // is turned on below, the actual space used may be smaller.
2880
2881 initHeapSize = MIN2(total_memory / (julong)2,
2882 total_memory - (julong)160*M);
2883
2884 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2885
2886 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2887 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2888 return JNI_EINVAL;
2889 }
2890 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2891 return JNI_EINVAL;
2892 }
2893 // Currently the minimum size and the initial heap sizes are the same.
2894 set_min_heap_size(initHeapSize);
2895 }
2896 if (FLAG_IS_DEFAULT(NewSize)) {
2897 // Make the young generation 3/8ths of the total heap.
2898 if (FLAG_SET_CMDLINE(size_t, NewSize,
2899 ((julong)MaxHeapSize / (julong)8) * (julong)3) != Flag::SUCCESS) {
2900 return JNI_EINVAL;
2901 }
2902 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2903 return JNI_EINVAL;
2904 }
2905 }
2906
2907 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2908 FLAG_SET_DEFAULT(UseLargePages, true);
2909 #endif
2910
2911 // Increase some data structure sizes for efficiency
2912 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2913 return JNI_EINVAL;
2914 }
2915 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2916 return JNI_EINVAL;
2917 }
2918 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256*K) != Flag::SUCCESS) {
2919 return JNI_EINVAL;
2920 }
2921
2922 // See the OldPLABSize comment below, but replace 'after promotion'
2923 // with 'after copying'. YoungPLABSize is the size of the survivor
2924 // space per-gc-thread buffers. The default is 4kw.
2925 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K) != Flag::SUCCESS) { // Note: this is in words
2926 return JNI_EINVAL;
2927 }
2928
2929 // OldPLABSize is the size of the buffers in the old gen that
2930 // UseParallelGC uses to promote live data that doesn't fit in the
2931 // survivor spaces. At any given time, there's one for each gc thread.
2932 // The default size is 1kw. These buffers are rarely used, since the
2933 // survivor spaces are usually big enough. For specjbb, however, there
2934 // are occasions when there's lots of live data in the young gen
2935 // and we end up promoting some of it. We don't have a definite
2936 // explanation for why bumping OldPLABSize helps, but the theory
2937 // is that a bigger PLAB results in retaining something like the
2938 // original allocation order after promotion, which improves mutator
2939 // locality. A minor effect may be that larger PLABs reduce the
2940 // number of PLAB allocation events during gc. The value of 8kw
2941 // was arrived at by experimenting with specjbb.
2942 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K) != Flag::SUCCESS) { // Note: this is in words
2943 return JNI_EINVAL;
2944 }
2945
2946 // Enable parallel GC and adaptive generation sizing
2947 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2948 return JNI_EINVAL;
2949 }
2950 FLAG_SET_DEFAULT(ParallelGCThreads,
2951 Abstract_VM_Version::parallel_worker_threads());
2952
2953 // Encourage steady state memory management
2954 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2955 return JNI_EINVAL;
2956 }
2957
2958 // This appears to improve mutator locality
2959 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2960 return JNI_EINVAL;
2961 }
2962
2963 // Get around early Solaris scheduling bug
2964 // (affinity vs other jobs on system)
2965 // but disallow DR and offlining (5008695).
2966 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2967 return JNI_EINVAL;
2968 }
2969
2970 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2971 // and the last option wins.
2972 } else if (match_option(option, "-XX:+NeverTenure")) {
2973 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
2974 return JNI_EINVAL;
2975 }
2976 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
2977 return JNI_EINVAL;
2978 }
2979 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
2980 return JNI_EINVAL;
2981 }
2982 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2983 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
2984 return JNI_EINVAL;
2985 }
2986 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
2987 return JNI_EINVAL;
2988 }
2989 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
2990 return JNI_EINVAL;
2991 }
2992 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2993 uintx max_tenuring_thresh = 0;
2994 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2995 jio_fprintf(defaultStream::error_stream(),
2996 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2997 return JNI_EINVAL;
2998 }
2999
3000 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3001 return JNI_EINVAL;
3002 }
3003
3004 if (MaxTenuringThreshold == 0) {
3005 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3006 return JNI_EINVAL;
3007 }
3008 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3009 return JNI_EINVAL;
3010 }
3011 } else {
3012 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3013 return JNI_EINVAL;
3014 }
3015 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3016 return JNI_EINVAL;
3017 }
3018 }
3019 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3020 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3021 return JNI_EINVAL;
3022 }
3023 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3024 return JNI_EINVAL;
3025 }
3026 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3027 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3028 return JNI_EINVAL;
3029 }
3030 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3031 return JNI_EINVAL;
3032 }
3033 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3034 #if defined(DTRACE_ENABLED)
3035 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3036 return JNI_EINVAL;
3037 }
3038 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3039 return JNI_EINVAL;
3040 }
3041 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3042 return JNI_EINVAL;
3043 }
3044 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3045 return JNI_EINVAL;
3046 }
3047 #else // defined(DTRACE_ENABLED)
3048 jio_fprintf(defaultStream::error_stream(),
3049 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3050 return JNI_EINVAL;
3051 #endif // defined(DTRACE_ENABLED)
3052 #ifdef ASSERT
3053 } else if (match_option(option, "-XX:+FullGCALot")) {
3054 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3055 return JNI_EINVAL;
3056 }
3057 // disable scavenge before parallel mark-compact
3058 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3059 return JNI_EINVAL;
3060 }
3061 #endif
3062 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3063 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3064 julong stack_size = 0;
3065 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3066 if (errcode != arg_in_range) {
3067 jio_fprintf(defaultStream::error_stream(),
3068 "Invalid mark stack size: %s\n", option->optionString);
3069 describe_range_error(errcode);
3070 return JNI_EINVAL;
3071 }
3072 jio_fprintf(defaultStream::error_stream(),
3073 "Please use -XX:MarkStackSize in place of "
3074 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n");
3075 if (FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size) != Flag::SUCCESS) {
3076 return JNI_EINVAL;
3077 }
3078 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3079 julong max_stack_size = 0;
3080 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3081 if (errcode != arg_in_range) {
3082 jio_fprintf(defaultStream::error_stream(),
3083 "Invalid maximum mark stack size: %s\n",
3084 option->optionString);
3085 describe_range_error(errcode);
3086 return JNI_EINVAL;
3087 }
3088 jio_fprintf(defaultStream::error_stream(),
3089 "Please use -XX:MarkStackSizeMax in place of "
3090 "-XX:CMSMarkStackSizeMax in the future\n");
3091 if (FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size) != Flag::SUCCESS) {
3092 return JNI_EINVAL;
3093 }
3094 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3095 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3096 uintx conc_threads = 0;
3097 if (!parse_uintx(tail, &conc_threads, 1)) {
3098 jio_fprintf(defaultStream::error_stream(),
3099 "Invalid concurrent threads: %s\n", option->optionString);
3100 return JNI_EINVAL;
3101 }
3102 jio_fprintf(defaultStream::error_stream(),
3103 "Please use -XX:ConcGCThreads in place of "
3104 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n");
3105 if (FLAG_SET_CMDLINE(uint, ConcGCThreads, conc_threads) != Flag::SUCCESS) {
3106 return JNI_EINVAL;
3107 }
3108 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3109 julong max_direct_memory_size = 0;
3110 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3111 if (errcode != arg_in_range) {
3112 jio_fprintf(defaultStream::error_stream(),
3113 "Invalid maximum direct memory size: %s\n",
3114 option->optionString);
3115 describe_range_error(errcode);
3116 return JNI_EINVAL;
3117 }
3118 if (FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size) != Flag::SUCCESS) {
3119 return JNI_EINVAL;
3120 }
3121 #if !INCLUDE_MANAGEMENT
3122 } else if (match_option(option, "-XX:+ManagementServer")) {
3123 jio_fprintf(defaultStream::error_stream(),
3124 "ManagementServer is not supported in this VM.\n");
3125 return JNI_ERR;
3126 #endif // INCLUDE_MANAGEMENT
3127 // CreateMinidumpOnCrash is removed, and replaced by CreateCoredumpOnCrash
3128 } else if (match_option(option, "-XX:+CreateMinidumpOnCrash")) {
3129 if (FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, true) != Flag::SUCCESS) {
3130 return JNI_EINVAL;
3131 }
3132 jio_fprintf(defaultStream::output_stream(),
3133 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is on\n");
3134 } else if (match_option(option, "-XX:-CreateMinidumpOnCrash")) {
3135 if (FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, false) != Flag::SUCCESS) {
3136 return JNI_EINVAL;
3137 }
3138 jio_fprintf(defaultStream::output_stream(),
3139 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is off\n");
3140 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3141 // Skip -XX:Flags= since that case has already been handled
3142 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3143 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3144 return JNI_EINVAL;
3145 }
3146 }
3147 // Unknown option
3148 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3149 return JNI_ERR;
3150 }
3151 }
3152
3153 // PrintSharedArchiveAndExit will turn on
3154 // -Xshare:on
3155 // -XX:+TraceClassPaths
3156 if (PrintSharedArchiveAndExit) {
3157 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3158 return JNI_EINVAL;
3159 }
3160 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3161 return JNI_EINVAL;
3162 }
3163 if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) {
3164 return JNI_EINVAL;
3165 }
3166 }
3167
3168 // Change the default value for flags which have different default values
3169 // when working with older JDKs.
3170 #ifdef LINUX
3171 if (JDK_Version::current().compare_major(6) <= 0 &&
3172 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3173 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3174 }
3175 #endif // LINUX
3176 fix_appclasspath();
3177 return JNI_OK;
3178 }
3179
3180 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3181 //
3182 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3183 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3184 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3185 // path is treated as the current directory.
3186 //
3187 // This causes problems with CDS, which requires that all directories specified in the classpath
3188 // must be empty. In most cases, applications do NOT want to load classes from the current
3189 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3190 // scripts compatible with CDS.
3191 void Arguments::fix_appclasspath() {
3192 if (IgnoreEmptyClassPaths) {
3193 const char separator = *os::path_separator();
3194 const char* src = _java_class_path->value();
3195
3196 // skip over all the leading empty paths
3197 while (*src == separator) {
3198 src ++;
3199 }
3200
3201 char* copy = os::strdup_check_oom(src, mtInternal);
3202
3203 // trim all trailing empty paths
3204 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3205 *tail = '\0';
3206 }
3207
3208 char from[3] = {separator, separator, '\0'};
3209 char to [2] = {separator, '\0'};
3210 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3211 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3212 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3213 }
3214
3215 _java_class_path->set_value(copy);
3216 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3217 }
3218
3219 if (!PrintSharedArchiveAndExit) {
3220 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3221 }
3222 }
3223
3224 static bool has_jar_files(const char* directory) {
3225 DIR* dir = os::opendir(directory);
3226 if (dir == NULL) return false;
3227
3228 struct dirent *entry;
3229 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3230 bool hasJarFile = false;
3231 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3232 const char* name = entry->d_name;
3233 const char* ext = name + strlen(name) - 4;
3234 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3235 }
3236 FREE_C_HEAP_ARRAY(char, dbuf);
3237 os::closedir(dir);
3238 return hasJarFile ;
3239 }
3240
3241 static int check_non_empty_dirs(const char* path) {
3242 const char separator = *os::path_separator();
3243 const char* const end = path + strlen(path);
3244 int nonEmptyDirs = 0;
3245 while (path < end) {
3246 const char* tmp_end = strchr(path, separator);
3247 if (tmp_end == NULL) {
3248 if (has_jar_files(path)) {
3249 nonEmptyDirs++;
3250 jio_fprintf(defaultStream::output_stream(),
3251 "Non-empty directory: %s\n", path);
3252 }
3253 path = end;
3254 } else {
3255 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3256 memcpy(dirpath, path, tmp_end - path);
3257 dirpath[tmp_end - path] = '\0';
3258 if (has_jar_files(dirpath)) {
3259 nonEmptyDirs++;
3260 jio_fprintf(defaultStream::output_stream(),
3261 "Non-empty directory: %s\n", dirpath);
3262 }
3263 FREE_C_HEAP_ARRAY(char, dirpath);
3264 path = tmp_end + 1;
3265 }
3266 }
3267 return nonEmptyDirs;
3268 }
3269
3270 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3271 // check if the default lib/endorsed directory exists; if so, error
3272 char path[JVM_MAXPATHLEN];
3273 const char* fileSep = os::file_separator();
3274 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3275
3276 if (CheckEndorsedAndExtDirs) {
3277 int nonEmptyDirs = 0;
3278 // check endorsed directory
3279 nonEmptyDirs += check_non_empty_dirs(path);
3280 // check the extension directories
3281 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3282 if (nonEmptyDirs > 0) {
3283 return JNI_ERR;
3284 }
3285 }
3286
3287 DIR* dir = os::opendir(path);
3288 if (dir != NULL) {
3289 jio_fprintf(defaultStream::output_stream(),
3290 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3291 "in modular form will be supported via the concept of upgradeable modules.\n");
3292 os::closedir(dir);
3293 return JNI_ERR;
3294 }
3295
3296 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3297 dir = os::opendir(path);
3298 if (dir != NULL) {
3299 jio_fprintf(defaultStream::output_stream(),
3300 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3301 "Use -classpath instead.\n.");
3302 os::closedir(dir);
3303 return JNI_ERR;
3304 }
3305
3306 if (scp_assembly_required) {
3307 // Assemble the bootclasspath elements into the final path.
3308 Arguments::set_sysclasspath(scp_p->combined_path());
3309 }
3310
3311 // This must be done after all arguments have been processed.
3312 // java_compiler() true means set to "NONE" or empty.
3313 if (java_compiler() && !xdebug_mode()) {
3314 // For backwards compatibility, we switch to interpreted mode if
3315 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3316 // not specified.
3317 set_mode_flags(_int);
3318 }
3319
3320 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3321 // but like -Xint, leave compilation thresholds unaffected.
3322 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3323 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3324 set_mode_flags(_int);
3325 }
3326
3327 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3328 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3329 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3330 }
3331
3332 #ifndef COMPILER2
3333 // Don't degrade server performance for footprint
3334 if (FLAG_IS_DEFAULT(UseLargePages) &&
3335 MaxHeapSize < LargePageHeapSizeThreshold) {
3336 // No need for large granularity pages w/small heaps.
3337 // Note that large pages are enabled/disabled for both the
3338 // Java heap and the code cache.
3339 FLAG_SET_DEFAULT(UseLargePages, false);
3340 }
3341
3342 #else
3343 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3344 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3345 }
3346 #endif
3347
3348 #ifndef TIERED
3349 // Tiered compilation is undefined.
3350 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3351 #endif
3352
3353 // If we are running in a headless jre, force java.awt.headless property
3354 // to be true unless the property has already been set.
3355 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3356 if (os::is_headless_jre()) {
3357 const char* headless = Arguments::get_property("java.awt.headless");
3358 if (headless == NULL) {
3359 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3360 if (headless_env == NULL) {
3361 if (!add_property("java.awt.headless=true")) {
3362 return JNI_ENOMEM;
3363 }
3364 } else {
3365 char buffer[256];
3366 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3367 if (!add_property(buffer)) {
3368 return JNI_ENOMEM;
3369 }
3370 }
3371 }
3372 }
3373
3374 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3375 // CMS can only be used with ParNew
3376 FLAG_SET_ERGO(bool, UseParNewGC, true);
3377 }
3378
3379 if (!check_vm_args_consistency()) {
3380 return JNI_ERR;
3381 }
3382
3383 return JNI_OK;
3384 }
3385
3386 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3387 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3388 scp_assembly_required_p);
3389 }
3390
3391 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3392 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3393 scp_assembly_required_p);
3394 }
3395
3396 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3397 char *buffer = ::getenv(name);
3398
3399 // Don't check this variable if user has special privileges
3400 // (e.g. unix su command).
3401 if (buffer == NULL || os::have_special_privileges()) {
3402 return JNI_OK;
3403 }
3404
3405 if ((buffer = os::strdup(buffer)) == NULL) {
3406 return JNI_ENOMEM;
3407 }
3408
3409 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3410 jio_fprintf(defaultStream::error_stream(),
3411 "Picked up %s: %s\n", name, buffer);
3412 char* rd = buffer; // pointer to the input string (rd)
3413 while (true) { // repeat for all options in the input string
3414 while (isspace(*rd)) rd++; // skip whitespace
3415 if (*rd == 0) break; // we re done when the input string is read completely
3416
3417 // The output, option string, overwrites the input string.
3418 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3419 // input string (rd).
3420 char* wrt = rd;
3421
3422 JavaVMOption option;
3423 option.optionString = wrt;
3424 options->append(option); // Fill in option
3425 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3426 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3427 int quote = *rd; // matching quote to look for
3428 rd++; // don't copy open quote
3429 while (*rd != quote) { // include everything (even spaces) up until quote
3430 if (*rd == 0) { // string termination means unmatched string
3431 jio_fprintf(defaultStream::error_stream(),
3432 "Unmatched quote in %s\n", name);
3433 delete options;
3434 os::free(buffer);
3435 return JNI_ERR;
3436 }
3437 *wrt++ = *rd++; // copy to option string
3438 }
3439 rd++; // don't copy close quote
3440 } else {
3441 *wrt++ = *rd++; // copy to option string
3442 }
3443 }
3444 // Need to check if we're done before writing a NULL,
3445 // because the write could be to the byte that rd is pointing to.
3446 if (*rd++ == 0) {
3447 *wrt = 0;
3448 break;
3449 }
3450 *wrt = 0; // Zero terminate option
3451 }
3452 JavaVMOption* options_arr =
3453 NEW_C_HEAP_ARRAY_RETURN_NULL(JavaVMOption, options->length(), mtInternal);
3454 if (options_arr == NULL) {
3455 delete options;
3456 os::free(buffer);
3457 return JNI_ENOMEM;
3458 }
3459 for (int i = 0; i < options->length(); i++) {
3460 options_arr[i] = options->at(i);
3461 }
3462
3463 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3464 JavaVMInitArgs vm_args;
3465 vm_args.version = JNI_VERSION_1_2;
3466 vm_args.options = options_arr;
3467 vm_args.nOptions = options->length();
3468 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3469
3470 if (PrintVMOptions) {
3471 const char* tail;
3472 for (int i = 0; i < vm_args.nOptions; i++) {
3473 const JavaVMOption *option = vm_args.options + i;
3474 if (match_option(option, "-XX:", &tail)) {
3475 logOption(tail);
3476 }
3477 }
3478 }
3479
3480 jint result = parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p,
3481 Flag::ENVIRON_VAR);
3482 FREE_C_HEAP_ARRAY(JavaVMOption, options_arr);
3483 delete options;
3484 os::free(buffer);
3485 return result;
3486 }
3487
3488 void Arguments::set_shared_spaces_flags() {
3489 if (DumpSharedSpaces) {
3490 if (RequireSharedSpaces) {
3491 warning("cannot dump shared archive while using shared archive");
3492 }
3493 UseSharedSpaces = false;
3494 #ifdef _LP64
3495 if (!UseCompressedOops || !UseCompressedClassPointers) {
3496 vm_exit_during_initialization(
3497 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3498 }
3499 } else {
3500 if (!UseCompressedOops || !UseCompressedClassPointers) {
3501 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3502 }
3503 #endif
3504 }
3505 }
3506
3507 #if !INCLUDE_ALL_GCS
3508 static void force_serial_gc() {
3509 FLAG_SET_DEFAULT(UseSerialGC, true);
3510 UNSUPPORTED_GC_OPTION(UseG1GC);
3511 UNSUPPORTED_GC_OPTION(UseParallelGC);
3512 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3513 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3514 UNSUPPORTED_GC_OPTION(UseParNewGC);
3515 }
3516 #endif // INCLUDE_ALL_GCS
3517
3518 // Sharing support
3519 // Construct the path to the archive
3520 static char* get_shared_archive_path() {
3521 char *shared_archive_path;
3522 if (SharedArchiveFile == NULL) {
3523 char jvm_path[JVM_MAXPATHLEN];
3524 os::jvm_path(jvm_path, sizeof(jvm_path));
3525 char *end = strrchr(jvm_path, *os::file_separator());
3526 if (end != NULL) *end = '\0';
3527 size_t jvm_path_len = strlen(jvm_path);
3528 size_t file_sep_len = strlen(os::file_separator());
3529 const size_t len = jvm_path_len + file_sep_len + 20;
3530 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3531 if (shared_archive_path != NULL) {
3532 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3533 jvm_path, os::file_separator());
3534 }
3535 } else {
3536 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3537 }
3538 return shared_archive_path;
3539 }
3540
3541 #ifndef PRODUCT
3542 // Determine whether LogVMOutput should be implicitly turned on.
3543 static bool use_vm_log() {
3544 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3545 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3546 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3547 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3548 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3549 return true;
3550 }
3551
3552 #ifdef COMPILER1
3553 if (PrintC1Statistics) {
3554 return true;
3555 }
3556 #endif // COMPILER1
3557
3558 #ifdef COMPILER2
3559 if (PrintOptoAssembly || PrintOptoStatistics) {
3560 return true;
3561 }
3562 #endif // COMPILER2
3563
3564 return false;
3565 }
3566 #endif // PRODUCT
3567
3568 // Parse entry point called from JNI_CreateJavaVM
3569
3570 jint Arguments::parse(const JavaVMInitArgs* args) {
3571
3572 // Initialize ranges and constraints
3573 CommandLineFlagRangeList::init();
3574 CommandLineFlagConstraintList::init();
3575
3576 // Remaining part of option string
3577 const char* tail;
3578
3579 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3580 const char* hotspotrc = ".hotspotrc";
3581 bool settings_file_specified = false;
3582 bool needs_hotspotrc_warning = false;
3583
3584 const char* flags_file;
3585 int index;
3586 for (index = 0; index < args->nOptions; index++) {
3587 const JavaVMOption *option = args->options + index;
3588 if (ArgumentsExt::process_options(option)) {
3589 continue;
3590 }
3591 if (match_option(option, "-XX:Flags=", &tail)) {
3592 flags_file = tail;
3593 settings_file_specified = true;
3594 continue;
3595 }
3596 if (match_option(option, "-XX:+PrintVMOptions")) {
3597 PrintVMOptions = true;
3598 continue;
3599 }
3600 if (match_option(option, "-XX:-PrintVMOptions")) {
3601 PrintVMOptions = false;
3602 continue;
3603 }
3604 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3605 IgnoreUnrecognizedVMOptions = true;
3606 continue;
3607 }
3608 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3609 IgnoreUnrecognizedVMOptions = false;
3610 continue;
3611 }
3612 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3613 CommandLineFlags::printFlags(tty, false);
3614 vm_exit(0);
3615 }
3616 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3617 #if INCLUDE_NMT
3618 // The launcher did not setup nmt environment variable properly.
3619 if (!MemTracker::check_launcher_nmt_support(tail)) {
3620 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3621 }
3622
3623 // Verify if nmt option is valid.
3624 if (MemTracker::verify_nmt_option()) {
3625 // Late initialization, still in single-threaded mode.
3626 if (MemTracker::tracking_level() >= NMT_summary) {
3627 MemTracker::init();
3628 }
3629 } else {
3630 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3631 }
3632 continue;
3633 #else
3634 jio_fprintf(defaultStream::error_stream(),
3635 "Native Memory Tracking is not supported in this VM\n");
3636 return JNI_ERR;
3637 #endif
3638 }
3639
3640 #ifndef PRODUCT
3641 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3642 CommandLineFlags::printFlags(tty, true);
3643 vm_exit(0);
3644 }
3645 #endif
3646 }
3647
3648 if (IgnoreUnrecognizedVMOptions) {
3649 // uncast const to modify the flag args->ignoreUnrecognized
3650 *(jboolean*)(&args->ignoreUnrecognized) = true;
3651 }
3652
3653 // Parse specified settings file
3654 if (settings_file_specified) {
3655 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3656 return JNI_EINVAL;
3657 }
3658 } else {
3659 #ifdef ASSERT
3660 // Parse default .hotspotrc settings file
3661 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3662 return JNI_EINVAL;
3663 }
3664 #else
3665 struct stat buf;
3666 if (os::stat(hotspotrc, &buf) == 0) {
3667 needs_hotspotrc_warning = true;
3668 }
3669 #endif
3670 }
3671
3672 if (PrintVMOptions) {
3673 for (index = 0; index < args->nOptions; index++) {
3674 const JavaVMOption *option = args->options + index;
3675 if (match_option(option, "-XX:", &tail)) {
3676 logOption(tail);
3677 }
3678 }
3679 }
3680
3681 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3682 jint result = parse_vm_init_args(args);
3683 if (result != JNI_OK) {
3684 return result;
3685 }
3686
3687 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3688 SharedArchivePath = get_shared_archive_path();
3689 if (SharedArchivePath == NULL) {
3690 return JNI_ENOMEM;
3691 }
3692
3693 // Set up VerifySharedSpaces
3694 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3695 VerifySharedSpaces = true;
3696 }
3697
3698 // Delay warning until here so that we've had a chance to process
3699 // the -XX:-PrintWarnings flag
3700 if (needs_hotspotrc_warning) {
3701 warning("%s file is present but has been ignored. "
3702 "Run with -XX:Flags=%s to load the file.",
3703 hotspotrc, hotspotrc);
3704 }
3705
3706 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3707 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3708 #endif
3709
3710 ArgumentsExt::report_unsupported_options();
3711
3712 #ifndef PRODUCT
3713 if (TraceBytecodesAt != 0) {
3714 TraceBytecodes = true;
3715 }
3716 if (CountCompiledCalls) {
3717 if (UseCounterDecay) {
3718 warning("UseCounterDecay disabled because CountCalls is set");
3719 UseCounterDecay = false;
3720 }
3721 }
3722 #endif // PRODUCT
3723
3724 if (ScavengeRootsInCode == 0) {
3725 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3726 warning("forcing ScavengeRootsInCode non-zero");
3727 }
3728 ScavengeRootsInCode = 1;
3729 }
3730
3731 if (PrintGCDetails) {
3732 // Turn on -verbose:gc options as well
3733 PrintGC = true;
3734 }
3735
3736 // Set object alignment values.
3737 set_object_alignment();
3738
3739 #if !INCLUDE_ALL_GCS
3740 force_serial_gc();
3741 #endif // INCLUDE_ALL_GCS
3742 #if !INCLUDE_CDS
3743 if (DumpSharedSpaces || RequireSharedSpaces) {
3744 jio_fprintf(defaultStream::error_stream(),
3745 "Shared spaces are not supported in this VM\n");
3746 return JNI_ERR;
3747 }
3748 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3749 warning("Shared spaces are not supported in this VM");
3750 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3751 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3752 }
3753 no_shared_spaces("CDS Disabled");
3754 #endif // INCLUDE_CDS
3755
3756 return JNI_OK;
3757 }
3758
3759 jint Arguments::apply_ergo() {
3760
3761 // Set flags based on ergonomics.
3762 set_ergonomics_flags();
3763
3764 set_shared_spaces_flags();
3765
3766 // Check the GC selections again.
3767 if (!check_gc_consistency()) {
3768 return JNI_EINVAL;
3769 }
3770
3771 if (TieredCompilation) {
3772 set_tiered_flags();
3773 } else {
3774 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3775 if (CompilationPolicyChoice >= 2) {
3776 vm_exit_during_initialization(
3777 "Incompatible compilation policy selected", NULL);
3778 }
3779 // Scale CompileThreshold
3780 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
3781 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
3782 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
3783 }
3784 }
3785
3786 #ifdef COMPILER2
3787 #ifndef PRODUCT
3788 if (PrintIdealGraphLevel > 0) {
3789 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3790 }
3791 #endif
3792 #endif
3793
3794 // Set heap size based on available physical memory
3795 set_heap_size();
3796
3797 ArgumentsExt::set_gc_specific_flags();
3798
3799 // Initialize Metaspace flags and alignments
3800 Metaspace::ergo_initialize();
3801
3802 // Set bytecode rewriting flags
3803 set_bytecode_flags();
3804
3805 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3806 set_aggressive_opts_flags();
3807
3808 // Turn off biased locking for locking debug mode flags,
3809 // which are subtly different from each other but neither works with
3810 // biased locking
3811 if (UseHeavyMonitors
3812 #ifdef COMPILER1
3813 || !UseFastLocking
3814 #endif // COMPILER1
3815 ) {
3816 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3817 // flag set to true on command line; warn the user that they
3818 // can't enable biased locking here
3819 warning("Biased Locking is not supported with locking debug flags"
3820 "; ignoring UseBiasedLocking flag." );
3821 }
3822 UseBiasedLocking = false;
3823 }
3824
3825 #ifdef ZERO
3826 // Clear flags not supported on zero.
3827 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3828 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3829 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3830 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3831 #endif // CC_INTERP
3832
3833 #ifdef COMPILER2
3834 if (!EliminateLocks) {
3835 EliminateNestedLocks = false;
3836 }
3837 if (!Inline) {
3838 IncrementalInline = false;
3839 }
3840 #ifndef PRODUCT
3841 if (!IncrementalInline) {
3842 AlwaysIncrementalInline = false;
3843 }
3844 #endif
3845 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3846 // nothing to use the profiling, turn if off
3847 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3848 }
3849 #endif
3850
3851 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3852 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3853 DebugNonSafepoints = true;
3854 }
3855
3856 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3857 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3858 }
3859
3860 #ifndef PRODUCT
3861 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3862 if (use_vm_log()) {
3863 LogVMOutput = true;
3864 }
3865 }
3866 #endif // PRODUCT
3867
3868 if (PrintCommandLineFlags) {
3869 CommandLineFlags::printSetFlags(tty);
3870 }
3871
3872 // Apply CPU specific policy for the BiasedLocking
3873 if (UseBiasedLocking) {
3874 if (!VM_Version::use_biased_locking() &&
3875 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3876 UseBiasedLocking = false;
3877 }
3878 }
3879 #ifdef COMPILER2
3880 if (!UseBiasedLocking || EmitSync != 0) {
3881 UseOptoBiasInlining = false;
3882 }
3883 #endif
3884
3885 return JNI_OK;
3886 }
3887
3888 jint Arguments::adjust_after_os() {
3889 if (UseNUMA) {
3890 if (UseParallelGC || UseParallelOldGC) {
3891 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3892 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3893 }
3894 }
3895 // UseNUMAInterleaving is set to ON for all collectors and
3896 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3897 // such as the parallel collector for Linux and Solaris will
3898 // interleave old gen and survivor spaces on top of NUMA
3899 // allocation policy for the eden space.
3900 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3901 // all platforms and ParallelGC on Windows will interleave all
3902 // of the heap spaces across NUMA nodes.
3903 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3904 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3905 }
3906 }
3907 return JNI_OK;
3908 }
3909
3910 // Any custom code post the final range and constraint check
3911 // can be done here. We pass a flag that specifies whether
3912 // the check passed successfully
3913 void Arguments::post_final_range_and_constraint_check(bool check_passed) {
3914 // This does not set the flag itself, but stores the value in a safe place for later usage.
3915 _min_heap_free_ratio = MinHeapFreeRatio;
3916 _max_heap_free_ratio = MaxHeapFreeRatio;
3917 }
3918
3919 int Arguments::PropertyList_count(SystemProperty* pl) {
3920 int count = 0;
3921 while(pl != NULL) {
3922 count++;
3923 pl = pl->next();
3924 }
3925 return count;
3926 }
3927
3928 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3929 assert(key != NULL, "just checking");
3930 SystemProperty* prop;
3931 for (prop = pl; prop != NULL; prop = prop->next()) {
3932 if (strcmp(key, prop->key()) == 0) return prop->value();
3933 }
3934 return NULL;
3935 }
3936
3937 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3938 int count = 0;
3939 const char* ret_val = NULL;
3940
3941 while(pl != NULL) {
3942 if(count >= index) {
3943 ret_val = pl->key();
3944 break;
3945 }
3946 count++;
3947 pl = pl->next();
3948 }
3949
3950 return ret_val;
3951 }
3952
3953 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3954 int count = 0;
3955 char* ret_val = NULL;
3956
3957 while(pl != NULL) {
3958 if(count >= index) {
3959 ret_val = pl->value();
3960 break;
3961 }
3962 count++;
3963 pl = pl->next();
3964 }
3965
3966 return ret_val;
3967 }
3968
3969 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3970 SystemProperty* p = *plist;
3971 if (p == NULL) {
3972 *plist = new_p;
3973 } else {
3974 while (p->next() != NULL) {
3975 p = p->next();
3976 }
3977 p->set_next(new_p);
3978 }
3979 }
3980
3981 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3982 if (plist == NULL)
3983 return;
3984
3985 SystemProperty* new_p = new SystemProperty(k, v, true);
3986 PropertyList_add(plist, new_p);
3987 }
3988
3989 void Arguments::PropertyList_add(SystemProperty *element) {
3990 PropertyList_add(&_system_properties, element);
3991 }
3992
3993 // This add maintains unique property key in the list.
3994 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3995 if (plist == NULL)
3996 return;
3997
3998 // If property key exist then update with new value.
3999 SystemProperty* prop;
4000 for (prop = *plist; prop != NULL; prop = prop->next()) {
4001 if (strcmp(k, prop->key()) == 0) {
4002 if (append) {
4003 prop->append_value(v);
4004 } else {
4005 prop->set_value(v);
4006 }
4007 return;
4008 }
4009 }
4010
4011 PropertyList_add(plist, k, v);
4012 }
4013
4014 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4015 // Returns true if all of the source pointed by src has been copied over to
4016 // the destination buffer pointed by buf. Otherwise, returns false.
4017 // Notes:
4018 // 1. If the length (buflen) of the destination buffer excluding the
4019 // NULL terminator character is not long enough for holding the expanded
4020 // pid characters, it also returns false instead of returning the partially
4021 // expanded one.
4022 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4023 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4024 char* buf, size_t buflen) {
4025 const char* p = src;
4026 char* b = buf;
4027 const char* src_end = &src[srclen];
4028 char* buf_end = &buf[buflen - 1];
4029
4030 while (p < src_end && b < buf_end) {
4031 if (*p == '%') {
4032 switch (*(++p)) {
4033 case '%': // "%%" ==> "%"
4034 *b++ = *p++;
4035 break;
4036 case 'p': { // "%p" ==> current process id
4037 // buf_end points to the character before the last character so
4038 // that we could write '\0' to the end of the buffer.
4039 size_t buf_sz = buf_end - b + 1;
4040 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4041
4042 // if jio_snprintf fails or the buffer is not long enough to hold
4043 // the expanded pid, returns false.
4044 if (ret < 0 || ret >= (int)buf_sz) {
4045 return false;
4046 } else {
4047 b += ret;
4048 assert(*b == '\0', "fail in copy_expand_pid");
4049 if (p == src_end && b == buf_end + 1) {
4050 // reach the end of the buffer.
4051 return true;
4052 }
4053 }
4054 p++;
4055 break;
4056 }
4057 default :
4058 *b++ = '%';
4059 }
4060 } else {
4061 *b++ = *p++;
4062 }
4063 }
4064 *b = '\0';
4065 return (p == src_end); // return false if not all of the source was copied
4066 }