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