1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "code/codeCacheExtensions.hpp"
31 #include "compiler/compilerOracle.hpp"
32 #include "gc/shared/cardTableRS.hpp"
33 #include "gc/shared/genCollectedHeap.hpp"
34 #include "gc/shared/referenceProcessor.hpp"
35 #include "gc/shared/taskqueue.hpp"
36 #include "logging/logConfiguration.hpp"
37 #include "memory/allocation.inline.hpp"
38 #include "memory/universe.inline.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "prims/jvmtiExport.hpp"
41 #include "runtime/arguments.hpp"
42 #include "runtime/arguments_ext.hpp"
43 #include "runtime/commandLineFlagConstraintList.hpp"
44 #include "runtime/commandLineFlagRangeList.hpp"
45 #include "runtime/globals.hpp"
46 #include "runtime/globals_extension.hpp"
47 #include "runtime/java.hpp"
48 #include "runtime/os.hpp"
49 #include "runtime/vm_version.hpp"
50 #include "services/management.hpp"
51 #include "services/memTracker.hpp"
52 #include "utilities/defaultStream.hpp"
53 #include "utilities/macros.hpp"
54 #include "utilities/stringUtils.hpp"
55 #if INCLUDE_ALL_GCS
56 #include "gc/cms/compactibleFreeListSpace.hpp"
57 #include "gc/g1/g1CollectedHeap.inline.hpp"
58 #include "gc/parallel/parallelScavengeHeap.hpp"
59 #endif // INCLUDE_ALL_GCS
60
61 // Note: This is a special bug reporting site for the JVM
62 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
63 #define DEFAULT_JAVA_LAUNCHER "generic"
64
65 #define UNSUPPORTED_GC_OPTION(gc) \
66 do { \
67 if (gc) { \
68 if (FLAG_IS_CMDLINE(gc)) { \
69 warning(#gc " is not supported in this VM. Using Serial GC."); \
70 } \
71 FLAG_SET_DEFAULT(gc, false); \
72 } \
73 } while(0)
74
75 char** Arguments::_jvm_flags_array = NULL;
76 int Arguments::_num_jvm_flags = 0;
77 char** Arguments::_jvm_args_array = NULL;
78 int Arguments::_num_jvm_args = 0;
79 char* Arguments::_java_command = NULL;
80 SystemProperty* Arguments::_system_properties = NULL;
81 const char* Arguments::_gc_log_filename = NULL;
82 bool Arguments::_has_profile = false;
83 size_t Arguments::_conservative_max_heap_alignment = 0;
84 size_t Arguments::_min_heap_size = 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()
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 { "ThreadSafetyMargin", JDK_Version::jdk(9), JDK_Version::jdk(10) },
278 { "LazyBootClassLoader", JDK_Version::jdk(9), JDK_Version::jdk(10) },
279 { "StarvationMonitorInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
280 { "PreInflateSpin", JDK_Version::jdk(9), JDK_Version::jdk(10) },
281 { NULL, JDK_Version(0), JDK_Version(0) }
282 };
283
284 // Returns true if the flag is obsolete and fits into the range specified
285 // for being ignored. In the case that the flag is ignored, the 'version'
286 // value is filled in with the version number when the flag became
287 // obsolete so that that value can be displayed to the user.
288 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
289 int i = 0;
290 assert(version != NULL, "Must provide a version buffer");
291 while (obsolete_jvm_flags[i].name != NULL) {
292 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
293 // <flag>=xxx form
294 // [-|+]<flag> form
295 size_t len = strlen(flag_status.name);
296 if ((strncmp(flag_status.name, s, len) == 0) &&
297 (strlen(s) == len)){
298 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
299 *version = flag_status.obsoleted_in;
300 return true;
301 }
302 }
303 i++;
304 }
305 return false;
306 }
307
308 // Constructs the system class path (aka boot class path) from the following
309 // components, in order:
310 //
311 // prefix // from -Xbootclasspath/p:...
312 // base // from os::get_system_properties() or -Xbootclasspath=
313 // suffix // from -Xbootclasspath/a:...
314 //
315 // This could be AllStatic, but it isn't needed after argument processing is
316 // complete.
317 class SysClassPath: public StackObj {
318 public:
319 SysClassPath(const char* base);
320 ~SysClassPath();
321
322 inline void set_base(const char* base);
323 inline void add_prefix(const char* prefix);
324 inline void add_suffix_to_prefix(const char* suffix);
325 inline void add_suffix(const char* suffix);
326 inline void reset_path(const char* base);
327
328 inline const char* get_base() const { return _items[_scp_base]; }
329 inline const char* get_prefix() const { return _items[_scp_prefix]; }
330 inline const char* get_suffix() const { return _items[_scp_suffix]; }
331
332 // Combine all the components into a single c-heap-allocated string; caller
333 // must free the string if/when no longer needed.
334 char* combined_path();
335
336 private:
337 // Utility routines.
338 static char* add_to_path(const char* path, const char* str, bool prepend);
339 static char* add_jars_to_path(char* path, const char* directory);
340
341 inline void reset_item_at(int index);
342
343 // Array indices for the items that make up the sysclasspath. All except the
344 // base are allocated in the C heap and freed by this class.
345 enum {
346 _scp_prefix, // from -Xbootclasspath/p:...
347 _scp_base, // the default sysclasspath
348 _scp_suffix, // from -Xbootclasspath/a:...
349 _scp_nitems // the number of items, must be last.
350 };
351
352 const char* _items[_scp_nitems];
353 };
354
355 SysClassPath::SysClassPath(const char* base) {
356 memset(_items, 0, sizeof(_items));
357 _items[_scp_base] = base;
358 }
359
360 SysClassPath::~SysClassPath() {
361 // Free everything except the base.
362 for (int i = 0; i < _scp_nitems; ++i) {
363 if (i != _scp_base) reset_item_at(i);
364 }
365 }
366
367 inline void SysClassPath::set_base(const char* base) {
368 _items[_scp_base] = base;
369 }
370
371 inline void SysClassPath::add_prefix(const char* prefix) {
372 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
373 }
374
375 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
376 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
377 }
378
379 inline void SysClassPath::add_suffix(const char* suffix) {
380 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
381 }
382
383 inline void SysClassPath::reset_item_at(int index) {
384 assert(index < _scp_nitems && index != _scp_base, "just checking");
385 if (_items[index] != NULL) {
386 FREE_C_HEAP_ARRAY(char, _items[index]);
387 _items[index] = NULL;
388 }
389 }
390
391 inline void SysClassPath::reset_path(const char* base) {
392 // Clear the prefix and suffix.
393 reset_item_at(_scp_prefix);
394 reset_item_at(_scp_suffix);
395 set_base(base);
396 }
397
398 //------------------------------------------------------------------------------
399
400
401 // Combine the bootclasspath elements, some of which may be null, into a single
402 // c-heap-allocated string.
403 char* SysClassPath::combined_path() {
404 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
405
406 size_t lengths[_scp_nitems];
407 size_t total_len = 0;
408
409 const char separator = *os::path_separator();
410
411 // Get the lengths.
412 int i;
413 for (i = 0; i < _scp_nitems; ++i) {
414 if (_items[i] != NULL) {
415 lengths[i] = strlen(_items[i]);
416 // Include space for the separator char (or a NULL for the last item).
417 total_len += lengths[i] + 1;
418 }
419 }
420 assert(total_len > 0, "empty sysclasspath not allowed");
421
422 // Copy the _items to a single string.
423 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
424 char* cp_tmp = cp;
425 for (i = 0; i < _scp_nitems; ++i) {
426 if (_items[i] != NULL) {
427 memcpy(cp_tmp, _items[i], lengths[i]);
428 cp_tmp += lengths[i];
429 *cp_tmp++ = separator;
430 }
431 }
432 *--cp_tmp = '\0'; // Replace the extra separator.
433 return cp;
434 }
435
436 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
437 char*
438 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
439 char *cp;
440
441 assert(str != NULL, "just checking");
442 if (path == NULL) {
443 size_t len = strlen(str) + 1;
444 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
445 memcpy(cp, str, len); // copy the trailing null
446 } else {
447 const char separator = *os::path_separator();
448 size_t old_len = strlen(path);
449 size_t str_len = strlen(str);
450 size_t len = old_len + str_len + 2;
451
452 if (prepend) {
453 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
454 char* cp_tmp = cp;
455 memcpy(cp_tmp, str, str_len);
456 cp_tmp += str_len;
457 *cp_tmp = separator;
458 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
459 FREE_C_HEAP_ARRAY(char, path);
460 } else {
461 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
462 char* cp_tmp = cp + old_len;
463 *cp_tmp = separator;
464 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
465 }
466 }
467 return cp;
468 }
469
470 // Scan the directory and append any jar or zip files found to path.
471 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
472 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
473 DIR* dir = os::opendir(directory);
474 if (dir == NULL) return path;
475
476 char dir_sep[2] = { '\0', '\0' };
477 size_t directory_len = strlen(directory);
478 const char fileSep = *os::file_separator();
479 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
480
481 /* Scan the directory for jars/zips, appending them to path. */
482 struct dirent *entry;
483 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
484 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
485 const char* name = entry->d_name;
486 const char* ext = name + strlen(name) - 4;
487 bool isJarOrZip = ext > name &&
488 (os::file_name_strcmp(ext, ".jar") == 0 ||
489 os::file_name_strcmp(ext, ".zip") == 0);
490 if (isJarOrZip) {
491 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
492 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
493 path = add_to_path(path, jarpath, false);
494 FREE_C_HEAP_ARRAY(char, jarpath);
495 }
496 }
497 FREE_C_HEAP_ARRAY(char, dbuf);
498 os::closedir(dir);
499 return path;
500 }
501
502 // Parses a memory size specification string.
503 static bool atomull(const char *s, julong* result) {
504 julong n = 0;
505 int args_read = 0;
506 bool is_hex = false;
507 // Skip leading 0[xX] for hexadecimal
508 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
509 s += 2;
510 is_hex = true;
511 args_read = sscanf(s, JULONG_FORMAT_X, &n);
512 } else {
513 args_read = sscanf(s, JULONG_FORMAT, &n);
514 }
515 if (args_read != 1) {
516 return false;
517 }
518 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
519 s++;
520 }
521 // 4705540: illegal if more characters are found after the first non-digit
522 if (strlen(s) > 1) {
523 return false;
524 }
525 switch (*s) {
526 case 'T': case 't':
527 *result = n * G * K;
528 // Check for overflow.
529 if (*result/((julong)G * K) != n) return false;
530 return true;
531 case 'G': case 'g':
532 *result = n * G;
533 if (*result/G != n) return false;
534 return true;
535 case 'M': case 'm':
536 *result = n * M;
537 if (*result/M != n) return false;
538 return true;
539 case 'K': case 'k':
540 *result = n * K;
541 if (*result/K != n) return false;
542 return true;
543 case '\0':
544 *result = n;
545 return true;
546 default:
547 return false;
548 }
549 }
550
551 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
552 if (size < min_size) return arg_too_small;
553 // Check that size will fit in a size_t (only relevant on 32-bit)
554 if (size > max_uintx) return arg_too_big;
555 return arg_in_range;
556 }
557
558 // Describe an argument out of range error
559 void Arguments::describe_range_error(ArgsRange errcode) {
560 switch(errcode) {
561 case arg_too_big:
562 jio_fprintf(defaultStream::error_stream(),
563 "The specified size exceeds the maximum "
564 "representable size.\n");
565 break;
566 case arg_too_small:
567 case arg_unreadable:
568 case arg_in_range:
569 // do nothing for now
570 break;
571 default:
572 ShouldNotReachHere();
573 }
574 }
575
576 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
577 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
578 return true;
579 } else {
580 return false;
581 }
582 }
583
584 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
585 double v;
586 if (sscanf(value, "%lf", &v) != 1) {
587 return false;
588 }
589
590 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
591 return true;
592 }
593 return false;
594 }
595
596 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
597 julong v;
598 int int_v;
599 intx intx_v;
600 bool is_neg = false;
601 // Check the sign first since atomull() parses only unsigned values.
602 if (*value == '-') {
603 if ((CommandLineFlags::intxAt(name, &intx_v) != Flag::SUCCESS) && (CommandLineFlags::intAt(name, &int_v) != Flag::SUCCESS)) {
604 return false;
605 }
606 value++;
607 is_neg = true;
608 }
609 if (!atomull(value, &v)) {
610 return false;
611 }
612 int_v = (int) v;
613 if (is_neg) {
614 int_v = -int_v;
615 }
616 if (CommandLineFlags::intAtPut(name, &int_v, origin) == Flag::SUCCESS) {
617 return true;
618 }
619 uint uint_v = (uint) v;
620 if (!is_neg && CommandLineFlags::uintAtPut(name, &uint_v, origin) == Flag::SUCCESS) {
621 return true;
622 }
623 intx_v = (intx) v;
624 if (is_neg) {
625 intx_v = -intx_v;
626 }
627 if (CommandLineFlags::intxAtPut(name, &intx_v, origin) == Flag::SUCCESS) {
628 return true;
629 }
630 uintx uintx_v = (uintx) v;
631 if (!is_neg && (CommandLineFlags::uintxAtPut(name, &uintx_v, origin) == Flag::SUCCESS)) {
632 return true;
633 }
634 uint64_t uint64_t_v = (uint64_t) v;
635 if (!is_neg && (CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin) == Flag::SUCCESS)) {
636 return true;
637 }
638 size_t size_t_v = (size_t) v;
639 if (!is_neg && (CommandLineFlags::size_tAtPut(name, &size_t_v, origin) == Flag::SUCCESS)) {
640 return true;
641 }
642 return false;
643 }
644
645 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
646 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
647 // Contract: CommandLineFlags always returns a pointer that needs freeing.
648 FREE_C_HEAP_ARRAY(char, value);
649 return true;
650 }
651
652 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
653 const char* old_value = "";
654 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
655 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
656 size_t new_len = strlen(new_value);
657 const char* value;
658 char* free_this_too = NULL;
659 if (old_len == 0) {
660 value = new_value;
661 } else if (new_len == 0) {
662 value = old_value;
663 } else {
664 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
665 // each new setting adds another LINE to the switch:
666 sprintf(buf, "%s\n%s", old_value, new_value);
667 value = buf;
668 free_this_too = buf;
669 }
670 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
671 // CommandLineFlags always returns a pointer that needs freeing.
672 FREE_C_HEAP_ARRAY(char, value);
673 if (free_this_too != NULL) {
674 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
675 FREE_C_HEAP_ARRAY(char, free_this_too);
676 }
677 return true;
678 }
679
680 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
681
682 // range of acceptable characters spelled out for portability reasons
683 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
684 #define BUFLEN 255
685 char name[BUFLEN+1];
686 char dummy;
687
688 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
689 return set_bool_flag(name, false, origin);
690 }
691 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
692 return set_bool_flag(name, true, origin);
693 }
694
695 char punct;
696 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
697 const char* value = strchr(arg, '=') + 1;
698 Flag* flag = Flag::find_flag(name, strlen(name));
699 if (flag != NULL && flag->is_ccstr()) {
700 if (flag->ccstr_accumulates()) {
701 return append_to_string_flag(name, value, origin);
702 } else {
703 if (value[0] == '\0') {
704 value = NULL;
705 }
706 return set_string_flag(name, value, origin);
707 }
708 }
709 }
710
711 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
712 const char* value = strchr(arg, '=') + 1;
713 // -XX:Foo:=xxx will reset the string flag to the given value.
714 if (value[0] == '\0') {
715 value = NULL;
716 }
717 return set_string_flag(name, value, origin);
718 }
719
720 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
721 #define SIGNED_NUMBER_RANGE "[-0123456789]"
722 #define NUMBER_RANGE "[0123456789]"
723 char value[BUFLEN + 1];
724 char value2[BUFLEN + 1];
725 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
726 // Looks like a floating-point number -- try again with more lenient format string
727 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
728 return set_fp_numeric_flag(name, value, origin);
729 }
730 }
731
732 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
733 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
734 return set_numeric_flag(name, value, origin);
735 }
736
737 return false;
738 }
739
740 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
741 assert(bldarray != NULL, "illegal argument");
742
743 if (arg == NULL) {
744 return;
745 }
746
747 int new_count = *count + 1;
748
749 // expand the array and add arg to the last element
750 if (*bldarray == NULL) {
751 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
752 } else {
753 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
754 }
755 (*bldarray)[*count] = os::strdup_check_oom(arg);
756 *count = new_count;
757 }
758
759 void Arguments::build_jvm_args(const char* arg) {
760 add_string(&_jvm_args_array, &_num_jvm_args, arg);
761 }
762
763 void Arguments::build_jvm_flags(const char* arg) {
764 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
765 }
766
767 // utility function to return a string that concatenates all
768 // strings in a given char** array
769 const char* Arguments::build_resource_string(char** args, int count) {
770 if (args == NULL || count == 0) {
771 return NULL;
772 }
773 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
774 for (int i = 1; i < count; i++) {
775 length += strlen(args[i]) + 1; // add 1 for a space
776 }
777 char* s = NEW_RESOURCE_ARRAY(char, length);
778 strcpy(s, args[0]);
779 for (int j = 1; j < count; j++) {
780 strcat(s, " ");
781 strcat(s, args[j]);
782 }
783 return (const char*) s;
784 }
785
786 void Arguments::print_on(outputStream* st) {
787 st->print_cr("VM Arguments:");
788 if (num_jvm_flags() > 0) {
789 st->print("jvm_flags: "); print_jvm_flags_on(st);
790 st->cr();
791 }
792 if (num_jvm_args() > 0) {
793 st->print("jvm_args: "); print_jvm_args_on(st);
794 st->cr();
795 }
796 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
797 if (_java_class_path != NULL) {
798 char* path = _java_class_path->value();
799 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
800 }
801 st->print_cr("Launcher Type: %s", _sun_java_launcher);
802 }
803
804 void Arguments::print_summary_on(outputStream* st) {
805 // Print the command line. Environment variables that are helpful for
806 // reproducing the problem are written later in the hs_err file.
807 // flags are from setting file
808 if (num_jvm_flags() > 0) {
809 st->print_raw("Settings File: ");
810 print_jvm_flags_on(st);
811 st->cr();
812 }
813 // args are the command line and environment variable arguments.
814 st->print_raw("Command Line: ");
815 if (num_jvm_args() > 0) {
816 print_jvm_args_on(st);
817 }
818 // this is the classfile and any arguments to the java program
819 if (java_command() != NULL) {
820 st->print("%s", java_command());
821 }
822 st->cr();
823 }
824
825 void Arguments::print_jvm_flags_on(outputStream* st) {
826 if (_num_jvm_flags > 0) {
827 for (int i=0; i < _num_jvm_flags; i++) {
828 st->print("%s ", _jvm_flags_array[i]);
829 }
830 }
831 }
832
833 void Arguments::print_jvm_args_on(outputStream* st) {
834 if (_num_jvm_args > 0) {
835 for (int i=0; i < _num_jvm_args; i++) {
836 st->print("%s ", _jvm_args_array[i]);
837 }
838 }
839 }
840
841 bool Arguments::process_argument(const char* arg,
842 jboolean ignore_unrecognized, Flag::Flags origin) {
843
844 JDK_Version since = JDK_Version();
845
846 if (parse_argument(arg, origin) || ignore_unrecognized) {
847 return true;
848 }
849
850 // Determine if the flag has '+', '-', or '=' characters.
851 bool has_plus_minus = (*arg == '+' || *arg == '-');
852 const char* const argname = has_plus_minus ? arg + 1 : arg;
853
854 size_t arg_len;
855 const char* equal_sign = strchr(argname, '=');
856 if (equal_sign == NULL) {
857 arg_len = strlen(argname);
858 } else {
859 arg_len = equal_sign - argname;
860 }
861
862 // Only make the obsolete check for valid arguments.
863 if (arg_len <= BUFLEN) {
864 // Construct a string which consists only of the argument name without '+', '-', or '='.
865 char stripped_argname[BUFLEN+1];
866 strncpy(stripped_argname, argname, arg_len);
867 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
868
869 if (is_newly_obsolete(stripped_argname, &since)) {
870 char version[256];
871 since.to_string(version, sizeof(version));
872 warning("ignoring option %s; support was removed in %s", stripped_argname, version);
873 return true;
874 }
875 }
876
877 // For locked flags, report a custom error message if available.
878 // Otherwise, report the standard unrecognized VM option.
879 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
880 if (found_flag != NULL) {
881 char locked_message_buf[BUFLEN];
882 found_flag->get_locked_message(locked_message_buf, BUFLEN);
883 if (strlen(locked_message_buf) == 0) {
884 if (found_flag->is_bool() && !has_plus_minus) {
885 jio_fprintf(defaultStream::error_stream(),
886 "Missing +/- setting for VM option '%s'\n", argname);
887 } else if (!found_flag->is_bool() && has_plus_minus) {
888 jio_fprintf(defaultStream::error_stream(),
889 "Unexpected +/- setting in VM option '%s'\n", argname);
890 } else {
891 jio_fprintf(defaultStream::error_stream(),
892 "Improperly specified VM option '%s'\n", argname);
893 }
894 } else {
895 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
896 }
897 } else {
898 jio_fprintf(defaultStream::error_stream(),
899 "Unrecognized VM option '%s'\n", argname);
900 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
901 if (fuzzy_matched != NULL) {
902 jio_fprintf(defaultStream::error_stream(),
903 "Did you mean '%s%s%s'? ",
904 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
905 fuzzy_matched->_name,
906 (fuzzy_matched->is_bool()) ? "" : "=<value>");
907 }
908 }
909
910 // allow for commandline "commenting out" options like -XX:#+Verbose
911 return arg[0] == '#';
912 }
913
914 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
915 FILE* stream = fopen(file_name, "rb");
916 if (stream == NULL) {
917 if (should_exist) {
918 jio_fprintf(defaultStream::error_stream(),
919 "Could not open settings file %s\n", file_name);
920 return false;
921 } else {
922 return true;
923 }
924 }
925
926 char token[1024];
927 int pos = 0;
928
929 bool in_white_space = true;
930 bool in_comment = false;
931 bool in_quote = false;
932 char quote_c = 0;
933 bool result = true;
934
935 int c = getc(stream);
936 while(c != EOF && pos < (int)(sizeof(token)-1)) {
937 if (in_white_space) {
938 if (in_comment) {
939 if (c == '\n') in_comment = false;
940 } else {
941 if (c == '#') in_comment = true;
942 else if (!isspace(c)) {
943 in_white_space = false;
944 token[pos++] = c;
945 }
946 }
947 } else {
948 if (c == '\n' || (!in_quote && isspace(c))) {
949 // token ends at newline, or at unquoted whitespace
950 // this allows a way to include spaces in string-valued options
951 token[pos] = '\0';
952 logOption(token);
953 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
954 build_jvm_flags(token);
955 pos = 0;
956 in_white_space = true;
957 in_quote = false;
958 } else if (!in_quote && (c == '\'' || c == '"')) {
959 in_quote = true;
960 quote_c = c;
961 } else if (in_quote && (c == quote_c)) {
962 in_quote = false;
963 } else {
964 token[pos++] = c;
965 }
966 }
967 c = getc(stream);
968 }
969 if (pos > 0) {
970 token[pos] = '\0';
971 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
972 build_jvm_flags(token);
973 }
974 fclose(stream);
975 return result;
976 }
977
978 //=============================================================================================================
979 // Parsing of properties (-D)
980
981 const char* Arguments::get_property(const char* key) {
982 return PropertyList_get_value(system_properties(), key);
983 }
984
985 bool Arguments::add_property(const char* prop) {
986 const char* eq = strchr(prop, '=');
987 const char* key;
988 const char* value = "";
989
990 if (eq == NULL) {
991 // property doesn't have a value, thus use passed string
992 key = prop;
993 } else {
994 // property have a value, thus extract it and save to the
995 // allocated string
996 size_t key_len = eq - prop;
997 char* tmp_key = AllocateHeap(key_len + 1, mtInternal);
998
999 strncpy(tmp_key, prop, key_len);
1000 tmp_key[key_len] = '\0';
1001 key = tmp_key;
1002
1003 value = &prop[key_len + 1];
1004 }
1005
1006 if (strcmp(key, "java.compiler") == 0) {
1007 process_java_compiler_argument(value);
1008 // Record value in Arguments, but let it get passed to Java.
1009 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1010 strcmp(key, "sun.java.launcher.pid") == 0) {
1011 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1012 // private and are processed in process_sun_java_launcher_properties();
1013 // the sun.java.launcher property is passed on to the java application
1014 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1015 PropertyList_unique_add(&_system_properties, key, value, true);
1016 } else {
1017 if (strcmp(key, "sun.java.command") == 0) {
1018 if (_java_command != NULL) {
1019 os::free(_java_command);
1020 }
1021 _java_command = os::strdup_check_oom(value, mtInternal);
1022 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1023 if (_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) {
1024 assert(_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL");
1025 os::free((void *)_java_vendor_url_bug);
1026 }
1027 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1028 // its value without going through the property list or making a Java call.
1029 _java_vendor_url_bug = os::strdup_check_oom(value, mtInternal);
1030 }
1031
1032 // Create new property and add at the end of the list
1033 PropertyList_unique_add(&_system_properties, key, value);
1034 }
1035
1036 if (key != prop) {
1037 // SystemProperty copy passed value, thus free previously allocated
1038 // memory
1039 FreeHeap((void *)key);
1040 }
1041
1042 return true;
1043 }
1044
1045 //===========================================================================================================
1046 // Setting int/mixed/comp mode flags
1047
1048 void Arguments::set_mode_flags(Mode mode) {
1049 // Set up default values for all flags.
1050 // If you add a flag to any of the branches below,
1051 // add a default value for it here.
1052 set_java_compiler(false);
1053 _mode = mode;
1054
1055 // Ensure Agent_OnLoad has the correct initial values.
1056 // This may not be the final mode; mode may change later in onload phase.
1057 PropertyList_unique_add(&_system_properties, "java.vm.info",
1058 VM_Version::vm_info_string(), false);
1059
1060 UseInterpreter = true;
1061 UseCompiler = true;
1062 UseLoopCounter = true;
1063
1064 // Default values may be platform/compiler dependent -
1065 // use the saved values
1066 ClipInlining = Arguments::_ClipInlining;
1067 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1068 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1069 BackgroundCompilation = Arguments::_BackgroundCompilation;
1070 if (TieredCompilation) {
1071 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1072 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1073 }
1074 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1075 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1076 }
1077 }
1078
1079 // Change from defaults based on mode
1080 switch (mode) {
1081 default:
1082 ShouldNotReachHere();
1083 break;
1084 case _int:
1085 UseCompiler = false;
1086 UseLoopCounter = false;
1087 AlwaysCompileLoopMethods = false;
1088 UseOnStackReplacement = false;
1089 break;
1090 case _mixed:
1091 // same as default
1092 break;
1093 case _comp:
1094 UseInterpreter = false;
1095 BackgroundCompilation = false;
1096 ClipInlining = false;
1097 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1098 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1099 // compile a level 4 (C2) and then continue executing it.
1100 if (TieredCompilation) {
1101 Tier3InvokeNotifyFreqLog = 0;
1102 Tier4InvocationThreshold = 0;
1103 }
1104 break;
1105 }
1106 }
1107
1108 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1109 // Conflict: required to use shared spaces (-Xshare:on), but
1110 // incompatible command line options were chosen.
1111
1112 static void no_shared_spaces(const char* message) {
1113 if (RequireSharedSpaces) {
1114 jio_fprintf(defaultStream::error_stream(),
1115 "Class data sharing is inconsistent with other specified options.\n");
1116 vm_exit_during_initialization("Unable to use shared archive.", message);
1117 } else {
1118 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1119 }
1120 }
1121 #endif
1122
1123 // Returns threshold scaled with the value of scale.
1124 // If scale < 0.0, threshold is returned without scaling.
1125 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1126 if (scale == 1.0 || scale < 0.0) {
1127 return threshold;
1128 } else {
1129 return (intx)(threshold * scale);
1130 }
1131 }
1132
1133 // Returns freq_log scaled with the value of scale.
1134 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1135 // If scale < 0.0, freq_log is returned without scaling.
1136 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1137 // Check if scaling is necessary or if negative value was specified.
1138 if (scale == 1.0 || scale < 0.0) {
1139 return freq_log;
1140 }
1141 // Check values to avoid calculating log2 of 0.
1142 if (scale == 0.0 || freq_log == 0) {
1143 return 0;
1144 }
1145 // Determine the maximum notification frequency value currently supported.
1146 // The largest mask value that the interpreter/C1 can handle is
1147 // of length InvocationCounter::number_of_count_bits. Mask values are always
1148 // one bit shorter then the value of the notification frequency. Set
1149 // max_freq_bits accordingly.
1150 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1151 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1152 if (scaled_freq == 0) {
1153 // Return 0 right away to avoid calculating log2 of 0.
1154 return 0;
1155 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1156 return max_freq_bits;
1157 } else {
1158 return log2_intptr(scaled_freq);
1159 }
1160 }
1161
1162 void Arguments::set_tiered_flags() {
1163 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1164 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1165 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1166 }
1167 if (CompilationPolicyChoice < 2) {
1168 vm_exit_during_initialization(
1169 "Incompatible compilation policy selected", NULL);
1170 }
1171 // Increase the code cache size - tiered compiles a lot more.
1172 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1173 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1174 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1175 }
1176 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1177 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1178 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1179
1180 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1181 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1182 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1183 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1184 }
1185 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1186 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1187 }
1188 // Check consistency of code heap sizes
1189 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1190 jio_fprintf(defaultStream::error_stream(),
1191 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1192 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1193 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1194 vm_exit(1);
1195 }
1196 }
1197 }
1198 if (!UseInterpreter) { // -Xcomp
1199 Tier3InvokeNotifyFreqLog = 0;
1200 Tier4InvocationThreshold = 0;
1201 }
1202
1203 if (CompileThresholdScaling < 0) {
1204 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1205 }
1206
1207 // Scale tiered compilation thresholds.
1208 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1209 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1210 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1211 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1212
1213 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1214 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1215 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1216 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1217
1218 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1219 // once these thresholds become supported.
1220
1221 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1222 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1223
1224 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1225 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1226
1227 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1228
1229 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1230 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1231 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1232 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1233 }
1234 }
1235
1236 #if INCLUDE_ALL_GCS
1237 static void disable_adaptive_size_policy(const char* collector_name) {
1238 if (UseAdaptiveSizePolicy) {
1239 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1240 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1241 collector_name);
1242 }
1243 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1244 }
1245 }
1246
1247 void Arguments::set_parnew_gc_flags() {
1248 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1249 "control point invariant");
1250 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1251 assert(UseParNewGC, "ParNew should always be used with CMS");
1252
1253 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1254 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1255 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1256 } else if (ParallelGCThreads == 0) {
1257 jio_fprintf(defaultStream::error_stream(),
1258 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1259 vm_exit(1);
1260 }
1261
1262 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1263 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1264 // we set them to 1024 and 1024.
1265 // See CR 6362902.
1266 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1267 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1268 }
1269 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1270 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1271 }
1272
1273 // When using compressed oops, we use local overflow stacks,
1274 // rather than using a global overflow list chained through
1275 // the klass word of the object's pre-image.
1276 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1277 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1278 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1279 }
1280 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1281 }
1282 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1283 }
1284
1285 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1286 // sparc/solaris for certain applications, but would gain from
1287 // further optimization and tuning efforts, and would almost
1288 // certainly gain from analysis of platform and environment.
1289 void Arguments::set_cms_and_parnew_gc_flags() {
1290 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1291 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1292 assert(UseParNewGC, "ParNew should always be used with CMS");
1293
1294 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1295 disable_adaptive_size_policy("UseConcMarkSweepGC");
1296
1297 set_parnew_gc_flags();
1298
1299 size_t max_heap = align_size_down(MaxHeapSize,
1300 CardTableRS::ct_max_alignment_constraint());
1301
1302 // Now make adjustments for CMS
1303 intx tenuring_default = (intx)6;
1304 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1305
1306 // Preferred young gen size for "short" pauses:
1307 // upper bound depends on # of threads and NewRatio.
1308 const size_t preferred_max_new_size_unaligned =
1309 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1310 size_t preferred_max_new_size =
1311 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1312
1313 // Unless explicitly requested otherwise, size young gen
1314 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1315
1316 // If either MaxNewSize or NewRatio is set on the command line,
1317 // assume the user is trying to set the size of the young gen.
1318 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1319
1320 // Set MaxNewSize to our calculated preferred_max_new_size unless
1321 // NewSize was set on the command line and it is larger than
1322 // preferred_max_new_size.
1323 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1324 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1325 } else {
1326 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1327 }
1328 if (PrintGCDetails && Verbose) {
1329 // Too early to use gclog_or_tty
1330 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1331 }
1332
1333 // Code along this path potentially sets NewSize and OldSize
1334 if (PrintGCDetails && Verbose) {
1335 // Too early to use gclog_or_tty
1336 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1337 " initial_heap_size: " SIZE_FORMAT
1338 " max_heap: " SIZE_FORMAT,
1339 min_heap_size(), InitialHeapSize, max_heap);
1340 }
1341 size_t min_new = preferred_max_new_size;
1342 if (FLAG_IS_CMDLINE(NewSize)) {
1343 min_new = NewSize;
1344 }
1345 if (max_heap > min_new && min_heap_size() > min_new) {
1346 // Unless explicitly requested otherwise, make young gen
1347 // at least min_new, and at most preferred_max_new_size.
1348 if (FLAG_IS_DEFAULT(NewSize)) {
1349 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1350 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1351 if (PrintGCDetails && Verbose) {
1352 // Too early to use gclog_or_tty
1353 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1354 }
1355 }
1356 // Unless explicitly requested otherwise, size old gen
1357 // so it's NewRatio x of NewSize.
1358 if (FLAG_IS_DEFAULT(OldSize)) {
1359 if (max_heap > NewSize) {
1360 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1361 if (PrintGCDetails && Verbose) {
1362 // Too early to use gclog_or_tty
1363 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1364 }
1365 }
1366 }
1367 }
1368 }
1369 // Unless explicitly requested otherwise, definitely
1370 // promote all objects surviving "tenuring_default" scavenges.
1371 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1372 FLAG_IS_DEFAULT(SurvivorRatio)) {
1373 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1374 }
1375 // If we decided above (or user explicitly requested)
1376 // `promote all' (via MaxTenuringThreshold := 0),
1377 // prefer minuscule survivor spaces so as not to waste
1378 // space for (non-existent) survivors
1379 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1380 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1381 }
1382
1383 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1384 // but rather the number of free blocks of a given size that are used when
1385 // replenishing the local per-worker free list caches.
1386 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1387 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1388 // OldPLAB sizing manually turned off: Use a larger default setting,
1389 // unless it was manually specified. This is because a too-low value
1390 // will slow down scavenges.
1391 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1392 } else {
1393 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1394 }
1395 }
1396
1397 // If either of the static initialization defaults have changed, note this
1398 // modification.
1399 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1400 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1401 }
1402
1403 if (!ClassUnloading) {
1404 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1405 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1406 }
1407
1408 if (PrintGCDetails && Verbose) {
1409 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1410 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1411 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1412 }
1413 }
1414 #endif // INCLUDE_ALL_GCS
1415
1416 void set_object_alignment() {
1417 // Object alignment.
1418 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1419 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1420 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1421 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1422 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1423 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1424
1425 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1426 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1427
1428 // Oop encoding heap max
1429 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1430
1431 if (SurvivorAlignmentInBytes == 0) {
1432 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1433 }
1434
1435 #if INCLUDE_ALL_GCS
1436 // Set CMS global values
1437 CompactibleFreeListSpace::set_cms_values();
1438 #endif // INCLUDE_ALL_GCS
1439 }
1440
1441 size_t Arguments::max_heap_for_compressed_oops() {
1442 // Avoid sign flip.
1443 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1444 // We need to fit both the NULL page and the heap into the memory budget, while
1445 // keeping alignment constraints of the heap. To guarantee the latter, as the
1446 // NULL page is located before the heap, we pad the NULL page to the conservative
1447 // maximum alignment that the GC may ever impose upon the heap.
1448 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1449 _conservative_max_heap_alignment);
1450
1451 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1452 NOT_LP64(ShouldNotReachHere(); return 0);
1453 }
1454
1455 bool Arguments::should_auto_select_low_pause_collector() {
1456 if (UseAutoGCSelectPolicy &&
1457 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1458 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1459 if (PrintGCDetails) {
1460 // Cannot use gclog_or_tty yet.
1461 tty->print_cr("Automatic selection of the low pause collector"
1462 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1463 }
1464 return true;
1465 }
1466 return false;
1467 }
1468
1469 void Arguments::set_use_compressed_oops() {
1470 #ifndef ZERO
1471 #ifdef _LP64
1472 // MaxHeapSize is not set up properly at this point, but
1473 // the only value that can override MaxHeapSize if we are
1474 // to use UseCompressedOops is InitialHeapSize.
1475 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1476
1477 if (max_heap_size <= max_heap_for_compressed_oops()) {
1478 #if !defined(COMPILER1) || defined(TIERED)
1479 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1480 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1481 }
1482 #endif
1483 } else {
1484 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1485 warning("Max heap size too large for Compressed Oops");
1486 FLAG_SET_DEFAULT(UseCompressedOops, false);
1487 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1488 }
1489 }
1490 #endif // _LP64
1491 #endif // ZERO
1492 }
1493
1494
1495 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1496 // set_use_compressed_oops().
1497 void Arguments::set_use_compressed_klass_ptrs() {
1498 #ifndef ZERO
1499 #ifdef _LP64
1500 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1501 if (!UseCompressedOops) {
1502 if (UseCompressedClassPointers) {
1503 warning("UseCompressedClassPointers requires UseCompressedOops");
1504 }
1505 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1506 } else {
1507 // Turn on UseCompressedClassPointers too
1508 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1509 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1510 }
1511 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1512 if (UseCompressedClassPointers) {
1513 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1514 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1515 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1516 }
1517 }
1518 }
1519 #endif // _LP64
1520 #endif // !ZERO
1521 }
1522
1523 void Arguments::set_conservative_max_heap_alignment() {
1524 // The conservative maximum required alignment for the heap is the maximum of
1525 // the alignments imposed by several sources: any requirements from the heap
1526 // itself, the collector policy and the maximum page size we may run the VM
1527 // with.
1528 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1529 #if INCLUDE_ALL_GCS
1530 if (UseParallelGC) {
1531 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1532 } else if (UseG1GC) {
1533 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1534 }
1535 #endif // INCLUDE_ALL_GCS
1536 _conservative_max_heap_alignment = MAX4(heap_alignment,
1537 (size_t)os::vm_allocation_granularity(),
1538 os::max_page_size(),
1539 CollectorPolicy::compute_heap_alignment());
1540 }
1541
1542 void Arguments::select_gc_ergonomically() {
1543 if (os::is_server_class_machine()) {
1544 if (should_auto_select_low_pause_collector()) {
1545 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1546 } else {
1547 #if defined(JAVASE_EMBEDDED)
1548 FLAG_SET_ERGO(bool, UseParallelGC, true);
1549 #else
1550 FLAG_SET_ERGO(bool, UseG1GC, true);
1551 #endif
1552 }
1553 } else {
1554 FLAG_SET_ERGO(bool, UseSerialGC, true);
1555 }
1556 }
1557
1558 void Arguments::select_gc() {
1559 if (!gc_selected()) {
1560 select_gc_ergonomically();
1561 guarantee(gc_selected(), "No GC selected");
1562 }
1563 }
1564
1565 void Arguments::set_ergonomics_flags() {
1566 select_gc();
1567
1568 #ifdef COMPILER2
1569 // Shared spaces work fine with other GCs but causes bytecode rewriting
1570 // to be disabled, which hurts interpreter performance and decreases
1571 // server performance. When -server is specified, keep the default off
1572 // unless it is asked for. Future work: either add bytecode rewriting
1573 // at link time, or rewrite bytecodes in non-shared methods.
1574 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1575 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1576 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1577 }
1578 #endif
1579
1580 set_conservative_max_heap_alignment();
1581
1582 #ifndef ZERO
1583 #ifdef _LP64
1584 set_use_compressed_oops();
1585
1586 // set_use_compressed_klass_ptrs() must be called after calling
1587 // set_use_compressed_oops().
1588 set_use_compressed_klass_ptrs();
1589
1590 // Also checks that certain machines are slower with compressed oops
1591 // in vm_version initialization code.
1592 #endif // _LP64
1593 #endif // !ZERO
1594
1595 CodeCacheExtensions::set_ergonomics_flags();
1596 }
1597
1598 void Arguments::set_parallel_gc_flags() {
1599 assert(UseParallelGC || UseParallelOldGC, "Error");
1600 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1601 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1602 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1603 }
1604 FLAG_SET_DEFAULT(UseParallelGC, true);
1605
1606 // If no heap maximum was requested explicitly, use some reasonable fraction
1607 // of the physical memory, up to a maximum of 1GB.
1608 FLAG_SET_DEFAULT(ParallelGCThreads,
1609 Abstract_VM_Version::parallel_worker_threads());
1610 if (ParallelGCThreads == 0) {
1611 jio_fprintf(defaultStream::error_stream(),
1612 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1613 vm_exit(1);
1614 }
1615
1616 if (UseAdaptiveSizePolicy) {
1617 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1618 // unless the user actually sets these flags.
1619 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1620 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1621 }
1622 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1623 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1624 }
1625 }
1626
1627 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1628 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1629 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1630 // See CR 6362902 for details.
1631 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1632 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1633 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1634 }
1635 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1636 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1637 }
1638 }
1639
1640 if (UseParallelOldGC) {
1641 // Par compact uses lower default values since they are treated as
1642 // minimums. These are different defaults because of the different
1643 // interpretation and are not ergonomically set.
1644 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1645 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1646 }
1647 }
1648 }
1649
1650 void Arguments::set_g1_gc_flags() {
1651 assert(UseG1GC, "Error");
1652 #ifdef COMPILER1
1653 FastTLABRefill = false;
1654 #endif
1655 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1656 if (ParallelGCThreads == 0) {
1657 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1658 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1659 }
1660
1661 #if INCLUDE_ALL_GCS
1662 if (G1ConcRefinementThreads == 0) {
1663 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1664 }
1665 #endif
1666
1667 // MarkStackSize will be set (if it hasn't been set by the user)
1668 // when concurrent marking is initialized.
1669 // Its value will be based upon the number of parallel marking threads.
1670 // But we do set the maximum mark stack size here.
1671 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1672 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1673 }
1674
1675 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1676 // In G1, we want the default GC overhead goal to be higher than
1677 // say in PS. So we set it here to 10%. Otherwise the heap might
1678 // be expanded more aggressively than we would like it to. In
1679 // fact, even 10% seems to not be high enough in some cases
1680 // (especially small GC stress tests that the main thing they do
1681 // is allocation). We might consider increase it further.
1682 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1683 }
1684
1685 if (PrintGCDetails && Verbose) {
1686 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1687 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1688 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1689 }
1690 }
1691
1692 #if !INCLUDE_ALL_GCS
1693 #ifdef ASSERT
1694 static bool verify_serial_gc_flags() {
1695 return (UseSerialGC &&
1696 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1697 UseParallelGC || UseParallelOldGC));
1698 }
1699 #endif // ASSERT
1700 #endif // INCLUDE_ALL_GCS
1701
1702 void Arguments::set_gc_specific_flags() {
1703 #if INCLUDE_ALL_GCS
1704 // Set per-collector flags
1705 if (UseParallelGC || UseParallelOldGC) {
1706 set_parallel_gc_flags();
1707 } else if (UseConcMarkSweepGC) {
1708 set_cms_and_parnew_gc_flags();
1709 } else if (UseG1GC) {
1710 set_g1_gc_flags();
1711 }
1712 check_deprecated_gc_flags();
1713 if (AssumeMP && !UseSerialGC) {
1714 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1715 warning("If the number of processors is expected to increase from one, then"
1716 " you should configure the number of parallel GC threads appropriately"
1717 " using -XX:ParallelGCThreads=N");
1718 }
1719 }
1720 if (MinHeapFreeRatio == 100) {
1721 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1722 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1723 }
1724 #else // INCLUDE_ALL_GCS
1725 assert(verify_serial_gc_flags(), "SerialGC unset");
1726 #endif // INCLUDE_ALL_GCS
1727 }
1728
1729 julong Arguments::limit_by_allocatable_memory(julong limit) {
1730 julong max_allocatable;
1731 julong result = limit;
1732 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1733 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1734 }
1735 return result;
1736 }
1737
1738 // Use static initialization to get the default before parsing
1739 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1740
1741 void Arguments::set_heap_size() {
1742 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1743 // Deprecated flag
1744 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1745 }
1746
1747 const julong phys_mem =
1748 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1749 : (julong)MaxRAM;
1750
1751 // If the maximum heap size has not been set with -Xmx,
1752 // then set it as fraction of the size of physical memory,
1753 // respecting the maximum and minimum sizes of the heap.
1754 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1755 julong reasonable_max = phys_mem / MaxRAMFraction;
1756
1757 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1758 // Small physical memory, so use a minimum fraction of it for the heap
1759 reasonable_max = phys_mem / MinRAMFraction;
1760 } else {
1761 // Not-small physical memory, so require a heap at least
1762 // as large as MaxHeapSize
1763 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1764 }
1765 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1766 // Limit the heap size to ErgoHeapSizeLimit
1767 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1768 }
1769 if (UseCompressedOops) {
1770 // Limit the heap size to the maximum possible when using compressed oops
1771 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1772
1773 // HeapBaseMinAddress can be greater than default but not less than.
1774 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1775 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1776 // matches compressed oops printing flags
1777 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1778 jio_fprintf(defaultStream::error_stream(),
1779 "HeapBaseMinAddress must be at least " SIZE_FORMAT
1780 " (" SIZE_FORMAT "G) which is greater than value given "
1781 SIZE_FORMAT "\n",
1782 DefaultHeapBaseMinAddress,
1783 DefaultHeapBaseMinAddress/G,
1784 HeapBaseMinAddress);
1785 }
1786 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1787 }
1788 }
1789
1790 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1791 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1792 // but it should be not less than default MaxHeapSize.
1793 max_coop_heap -= HeapBaseMinAddress;
1794 }
1795 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1796 }
1797 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1798
1799 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1800 // An initial heap size was specified on the command line,
1801 // so be sure that the maximum size is consistent. Done
1802 // after call to limit_by_allocatable_memory because that
1803 // method might reduce the allocation size.
1804 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1805 }
1806
1807 if (PrintGCDetails && Verbose) {
1808 // Cannot use gclog_or_tty yet.
1809 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1810 }
1811 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1812 }
1813
1814 // If the minimum or initial heap_size have not been set or requested to be set
1815 // ergonomically, set them accordingly.
1816 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1817 julong reasonable_minimum = (julong)(OldSize + NewSize);
1818
1819 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1820
1821 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1822
1823 if (InitialHeapSize == 0) {
1824 julong reasonable_initial = phys_mem / InitialRAMFraction;
1825
1826 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1827 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1828
1829 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1830
1831 if (PrintGCDetails && Verbose) {
1832 // Cannot use gclog_or_tty yet.
1833 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1834 }
1835 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1836 }
1837 // If the minimum heap size has not been set (via -Xms),
1838 // synchronize with InitialHeapSize to avoid errors with the default value.
1839 if (min_heap_size() == 0) {
1840 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1841 if (PrintGCDetails && Verbose) {
1842 // Cannot use gclog_or_tty yet.
1843 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1844 }
1845 }
1846 }
1847 }
1848
1849 // This must be called after ergonomics.
1850 void Arguments::set_bytecode_flags() {
1851 if (!RewriteBytecodes) {
1852 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1853 }
1854 }
1855
1856 // Aggressive optimization flags -XX:+AggressiveOpts
1857 jint Arguments::set_aggressive_opts_flags() {
1858 #ifdef COMPILER2
1859 if (AggressiveUnboxing) {
1860 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1861 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1862 } else if (!EliminateAutoBox) {
1863 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1864 AggressiveUnboxing = false;
1865 }
1866 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1867 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1868 } else if (!DoEscapeAnalysis) {
1869 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1870 AggressiveUnboxing = false;
1871 }
1872 }
1873 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1874 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1875 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1876 }
1877 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1878 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1879 }
1880
1881 // Feed the cache size setting into the JDK
1882 char buffer[1024];
1883 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1884 if (!add_property(buffer)) {
1885 return JNI_ENOMEM;
1886 }
1887 }
1888 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1889 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1890 }
1891 #endif
1892
1893 if (AggressiveOpts) {
1894 // Sample flag setting code
1895 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1896 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1897 // }
1898 }
1899
1900 return JNI_OK;
1901 }
1902
1903 //===========================================================================================================
1904 // Parsing of java.compiler property
1905
1906 void Arguments::process_java_compiler_argument(const char* arg) {
1907 // For backwards compatibility, Djava.compiler=NONE or ""
1908 // causes us to switch to -Xint mode UNLESS -Xdebug
1909 // is also specified.
1910 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1911 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1912 }
1913 }
1914
1915 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1916 _sun_java_launcher = os::strdup_check_oom(launcher);
1917 }
1918
1919 bool Arguments::created_by_java_launcher() {
1920 assert(_sun_java_launcher != NULL, "property must have value");
1921 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1922 }
1923
1924 bool Arguments::sun_java_launcher_is_altjvm() {
1925 return _sun_java_launcher_is_altjvm;
1926 }
1927
1928 //===========================================================================================================
1929 // Parsing of main arguments
1930
1931 // check if do gclog rotation
1932 // +UseGCLogFileRotation is a must,
1933 // no gc log rotation when log file not supplied or
1934 // NumberOfGCLogFiles is 0
1935 void check_gclog_consistency() {
1936 if (UseGCLogFileRotation) {
1937 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1938 jio_fprintf(defaultStream::output_stream(),
1939 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1940 "where num_of_file > 0\n"
1941 "GC log rotation is turned off\n");
1942 UseGCLogFileRotation = false;
1943 }
1944 }
1945
1946 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1947 if (FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K) == Flag::SUCCESS) {
1948 jio_fprintf(defaultStream::output_stream(),
1949 "GCLogFileSize changed to minimum 8K\n");
1950 }
1951 }
1952 }
1953
1954 // This function is called for -Xloggc:<filename>, it can be used
1955 // to check if a given file name(or string) conforms to the following
1956 // specification:
1957 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1958 // %p and %t only allowed once. We only limit usage of filename not path
1959 bool is_filename_valid(const char *file_name) {
1960 const char* p = file_name;
1961 char file_sep = os::file_separator()[0];
1962 const char* cp;
1963 // skip prefix path
1964 for (cp = file_name; *cp != '\0'; cp++) {
1965 if (*cp == '/' || *cp == file_sep) {
1966 p = cp + 1;
1967 }
1968 }
1969
1970 int count_p = 0;
1971 int count_t = 0;
1972 while (*p != '\0') {
1973 if ((*p >= '0' && *p <= '9') ||
1974 (*p >= 'A' && *p <= 'Z') ||
1975 (*p >= 'a' && *p <= 'z') ||
1976 *p == '-' ||
1977 *p == '_' ||
1978 *p == '.') {
1979 p++;
1980 continue;
1981 }
1982 if (*p == '%') {
1983 if(*(p + 1) == 'p') {
1984 p += 2;
1985 count_p ++;
1986 continue;
1987 }
1988 if (*(p + 1) == 't') {
1989 p += 2;
1990 count_t ++;
1991 continue;
1992 }
1993 }
1994 return false;
1995 }
1996 return count_p < 2 && count_t < 2;
1997 }
1998
1999 // Check consistency of GC selection
2000 bool Arguments::check_gc_consistency() {
2001 check_gclog_consistency();
2002 // Ensure that the user has not selected conflicting sets
2003 // of collectors.
2004 uint i = 0;
2005 if (UseSerialGC) i++;
2006 if (UseConcMarkSweepGC) i++;
2007 if (UseParallelGC || UseParallelOldGC) i++;
2008 if (UseG1GC) i++;
2009 if (i > 1) {
2010 jio_fprintf(defaultStream::error_stream(),
2011 "Conflicting collector combinations in option list; "
2012 "please refer to the release notes for the combinations "
2013 "allowed\n");
2014 return false;
2015 }
2016
2017 if (UseConcMarkSweepGC && !UseParNewGC) {
2018 jio_fprintf(defaultStream::error_stream(),
2019 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2020 return false;
2021 }
2022
2023 if (UseParNewGC && !UseConcMarkSweepGC) {
2024 jio_fprintf(defaultStream::error_stream(),
2025 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2026 return false;
2027 }
2028
2029 return true;
2030 }
2031
2032 void Arguments::check_deprecated_gc_flags() {
2033 if (FLAG_IS_CMDLINE(UseParNewGC)) {
2034 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2035 }
2036 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2037 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2038 "and will likely be removed in future release");
2039 }
2040 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2041 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2042 "Use MaxRAMFraction instead.");
2043 }
2044 }
2045
2046 // Check the consistency of vm_init_args
2047 bool Arguments::check_vm_args_consistency() {
2048 // Method for adding checks for flag consistency.
2049 // The intent is to warn the user of all possible conflicts,
2050 // before returning an error.
2051 // Note: Needs platform-dependent factoring.
2052 bool status = true;
2053
2054 if (TLABRefillWasteFraction == 0) {
2055 jio_fprintf(defaultStream::error_stream(),
2056 "TLABRefillWasteFraction should be a denominator, "
2057 "not " SIZE_FORMAT "\n",
2058 TLABRefillWasteFraction);
2059 status = false;
2060 }
2061
2062 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2063 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2064 }
2065
2066 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2067 // Settings to encourage splitting.
2068 if (!FLAG_IS_CMDLINE(NewRatio)) {
2069 if (FLAG_SET_CMDLINE(uintx, NewRatio, 2) != Flag::SUCCESS) {
2070 status = false;
2071 }
2072 }
2073 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2074 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2075 status = false;
2076 }
2077 }
2078 }
2079
2080 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2081 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2082 }
2083
2084 if (GCTimeLimit == 100) {
2085 // Turn off gc-overhead-limit-exceeded checks
2086 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2087 }
2088
2089 status = status && check_gc_consistency();
2090
2091 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2092 // insists that we hold the requisite locks so that the iteration is
2093 // MT-safe. For the verification at start-up and shut-down, we don't
2094 // yet have a good way of acquiring and releasing these locks,
2095 // which are not visible at the CollectedHeap level. We want to
2096 // be able to acquire these locks and then do the iteration rather
2097 // than just disable the lock verification. This will be fixed under
2098 // bug 4788986.
2099 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2100 if (VerifyDuringStartup) {
2101 warning("Heap verification at start-up disabled "
2102 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2103 VerifyDuringStartup = false; // Disable verification at start-up
2104 }
2105
2106 if (VerifyBeforeExit) {
2107 warning("Heap verification at shutdown disabled "
2108 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2109 VerifyBeforeExit = false; // Disable verification at shutdown
2110 }
2111 }
2112
2113 // Note: only executed in non-PRODUCT mode
2114 if (!UseAsyncConcMarkSweepGC &&
2115 (ExplicitGCInvokesConcurrent ||
2116 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2117 jio_fprintf(defaultStream::error_stream(),
2118 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2119 " with -UseAsyncConcMarkSweepGC");
2120 status = false;
2121 }
2122
2123 if (PrintNMTStatistics) {
2124 #if INCLUDE_NMT
2125 if (MemTracker::tracking_level() == NMT_off) {
2126 #endif // INCLUDE_NMT
2127 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2128 PrintNMTStatistics = false;
2129 #if INCLUDE_NMT
2130 }
2131 #endif
2132 }
2133
2134 // Check lower bounds of the code cache
2135 // Template Interpreter code is approximately 3X larger in debug builds.
2136 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2137 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2138 jio_fprintf(defaultStream::error_stream(),
2139 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2140 os::vm_page_size()/K);
2141 status = false;
2142 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2143 jio_fprintf(defaultStream::error_stream(),
2144 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2145 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2146 status = false;
2147 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2148 jio_fprintf(defaultStream::error_stream(),
2149 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2150 min_code_cache_size/K);
2151 status = false;
2152 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2153 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2154 jio_fprintf(defaultStream::error_stream(),
2155 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2156 CODE_CACHE_SIZE_LIMIT/M);
2157 status = false;
2158 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2159 jio_fprintf(defaultStream::error_stream(),
2160 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2161 min_code_cache_size/K);
2162 status = false;
2163 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2164 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2165 jio_fprintf(defaultStream::error_stream(),
2166 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2167 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2168 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2169 status = false;
2170 }
2171
2172 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2173 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2174 }
2175
2176 return status;
2177 }
2178
2179 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2180 const char* option_type) {
2181 if (ignore) return false;
2182
2183 const char* spacer = " ";
2184 if (option_type == NULL) {
2185 option_type = ++spacer; // Set both to the empty string.
2186 }
2187
2188 if (os::obsolete_option(option)) {
2189 jio_fprintf(defaultStream::error_stream(),
2190 "Obsolete %s%soption: %s\n", option_type, spacer,
2191 option->optionString);
2192 return false;
2193 } else {
2194 jio_fprintf(defaultStream::error_stream(),
2195 "Unrecognized %s%soption: %s\n", option_type, spacer,
2196 option->optionString);
2197 return true;
2198 }
2199 }
2200
2201 static const char* user_assertion_options[] = {
2202 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2203 };
2204
2205 static const char* system_assertion_options[] = {
2206 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2207 };
2208
2209 bool Arguments::parse_uintx(const char* value,
2210 uintx* uintx_arg,
2211 uintx min_size) {
2212
2213 // Check the sign first since atomull() parses only unsigned values.
2214 bool value_is_positive = !(*value == '-');
2215
2216 if (value_is_positive) {
2217 julong n;
2218 bool good_return = atomull(value, &n);
2219 if (good_return) {
2220 bool above_minimum = n >= min_size;
2221 bool value_is_too_large = n > max_uintx;
2222
2223 if (above_minimum && !value_is_too_large) {
2224 *uintx_arg = n;
2225 return true;
2226 }
2227 }
2228 }
2229 return false;
2230 }
2231
2232 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2233 julong* long_arg,
2234 julong min_size) {
2235 if (!atomull(s, long_arg)) return arg_unreadable;
2236 return check_memory_size(*long_arg, min_size);
2237 }
2238
2239 // Parse JavaVMInitArgs structure
2240
2241 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2242 const JavaVMInitArgs *java_options_args,
2243 const JavaVMInitArgs *cmd_line_args) {
2244 // For components of the system classpath.
2245 SysClassPath scp(Arguments::get_sysclasspath());
2246 bool scp_assembly_required = false;
2247
2248 // Save default settings for some mode flags
2249 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2250 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2251 Arguments::_ClipInlining = ClipInlining;
2252 Arguments::_BackgroundCompilation = BackgroundCompilation;
2253 if (TieredCompilation) {
2254 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2255 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2256 }
2257
2258 // Setup flags for mixed which is the default
2259 set_mode_flags(_mixed);
2260
2261 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2262 // variable (if present).
2263 jint result = parse_each_vm_init_arg(
2264 java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2265 if (result != JNI_OK) {
2266 return result;
2267 }
2268
2269 // Parse args structure generated from the command line flags.
2270 result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required,
2271 Flag::COMMAND_LINE);
2272 if (result != JNI_OK) {
2273 return result;
2274 }
2275
2276 // Parse args structure generated from the _JAVA_OPTIONS environment
2277 // variable (if present) (mimics classic VM)
2278 result = parse_each_vm_init_arg(
2279 java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2280 if (result != JNI_OK) {
2281 return result;
2282 }
2283
2284 // Do final processing now that all arguments have been parsed
2285 result = finalize_vm_init_args(&scp, scp_assembly_required);
2286 if (result != JNI_OK) {
2287 return result;
2288 }
2289
2290 return JNI_OK;
2291 }
2292
2293 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2294 // represents a valid JDWP agent. is_path==true denotes that we
2295 // are dealing with -agentpath (case where name is a path), otherwise with
2296 // -agentlib
2297 bool valid_jdwp_agent(char *name, bool is_path) {
2298 char *_name;
2299 const char *_jdwp = "jdwp";
2300 size_t _len_jdwp, _len_prefix;
2301
2302 if (is_path) {
2303 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2304 return false;
2305 }
2306
2307 _name++; // skip past last path separator
2308 _len_prefix = strlen(JNI_LIB_PREFIX);
2309
2310 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2311 return false;
2312 }
2313
2314 _name += _len_prefix;
2315 _len_jdwp = strlen(_jdwp);
2316
2317 if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2318 _name += _len_jdwp;
2319 }
2320 else {
2321 return false;
2322 }
2323
2324 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2325 return false;
2326 }
2327
2328 return true;
2329 }
2330
2331 if (strcmp(name, _jdwp) == 0) {
2332 return true;
2333 }
2334
2335 return false;
2336 }
2337
2338 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2339 SysClassPath* scp_p,
2340 bool* scp_assembly_required_p,
2341 Flag::Flags origin) {
2342 // Remaining part of option string
2343 const char* tail;
2344
2345 // iterate over arguments
2346 for (int index = 0; index < args->nOptions; index++) {
2347 bool is_absolute_path = false; // for -agentpath vs -agentlib
2348
2349 const JavaVMOption* option = args->options + index;
2350
2351 if (!match_option(option, "-Djava.class.path", &tail) &&
2352 !match_option(option, "-Dsun.java.command", &tail) &&
2353 !match_option(option, "-Dsun.java.launcher", &tail)) {
2354
2355 // add all jvm options to the jvm_args string. This string
2356 // is used later to set the java.vm.args PerfData string constant.
2357 // the -Djava.class.path and the -Dsun.java.command options are
2358 // omitted from jvm_args string as each have their own PerfData
2359 // string constant object.
2360 build_jvm_args(option->optionString);
2361 }
2362
2363 // -verbose:[class/gc/jni]
2364 if (match_option(option, "-verbose", &tail)) {
2365 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2366 if (FLAG_SET_CMDLINE(bool, TraceClassLoading, true) != Flag::SUCCESS) {
2367 return JNI_EINVAL;
2368 }
2369 if (FLAG_SET_CMDLINE(bool, TraceClassUnloading, true) != Flag::SUCCESS) {
2370 return JNI_EINVAL;
2371 }
2372 } else if (!strcmp(tail, ":gc")) {
2373 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
2374 return JNI_EINVAL;
2375 }
2376 } else if (!strcmp(tail, ":jni")) {
2377 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2378 return JNI_EINVAL;
2379 }
2380 }
2381 // -da / -ea / -disableassertions / -enableassertions
2382 // These accept an optional class/package name separated by a colon, e.g.,
2383 // -da:java.lang.Thread.
2384 } else if (match_option(option, user_assertion_options, &tail, true)) {
2385 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2386 if (*tail == '\0') {
2387 JavaAssertions::setUserClassDefault(enable);
2388 } else {
2389 assert(*tail == ':', "bogus match by match_option()");
2390 JavaAssertions::addOption(tail + 1, enable);
2391 }
2392 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2393 } else if (match_option(option, system_assertion_options, &tail, false)) {
2394 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2395 JavaAssertions::setSystemClassDefault(enable);
2396 // -bootclasspath:
2397 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2398 scp_p->reset_path(tail);
2399 *scp_assembly_required_p = true;
2400 // -bootclasspath/a:
2401 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2402 scp_p->add_suffix(tail);
2403 *scp_assembly_required_p = true;
2404 // -bootclasspath/p:
2405 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2406 scp_p->add_prefix(tail);
2407 *scp_assembly_required_p = true;
2408 // -Xrun
2409 } else if (match_option(option, "-Xrun", &tail)) {
2410 if (tail != NULL) {
2411 const char* pos = strchr(tail, ':');
2412 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2413 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2414 name[len] = '\0';
2415
2416 char *options = NULL;
2417 if(pos != NULL) {
2418 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2419 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2420 }
2421 #if !INCLUDE_JVMTI
2422 if (strcmp(name, "jdwp") == 0) {
2423 jio_fprintf(defaultStream::error_stream(),
2424 "Debugging agents are not supported in this VM\n");
2425 return JNI_ERR;
2426 }
2427 #endif // !INCLUDE_JVMTI
2428 add_init_library(name, options);
2429 }
2430 // -agentlib and -agentpath
2431 } else if (match_option(option, "-agentlib:", &tail) ||
2432 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2433 if(tail != NULL) {
2434 const char* pos = strchr(tail, '=');
2435 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2436 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2437 name[len] = '\0';
2438
2439 char *options = NULL;
2440 if(pos != NULL) {
2441 options = os::strdup_check_oom(pos + 1, mtInternal);
2442 }
2443 #if !INCLUDE_JVMTI
2444 if (valid_jdwp_agent(name, is_absolute_path)) {
2445 jio_fprintf(defaultStream::error_stream(),
2446 "Debugging agents are not supported in this VM\n");
2447 return JNI_ERR;
2448 }
2449 #endif // !INCLUDE_JVMTI
2450 add_init_agent(name, options, is_absolute_path);
2451 }
2452 // -javaagent
2453 } else if (match_option(option, "-javaagent:", &tail)) {
2454 #if !INCLUDE_JVMTI
2455 jio_fprintf(defaultStream::error_stream(),
2456 "Instrumentation agents are not supported in this VM\n");
2457 return JNI_ERR;
2458 #else
2459 if(tail != NULL) {
2460 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2461 add_init_agent("instrument", options, false);
2462 }
2463 #endif // !INCLUDE_JVMTI
2464 // -Xnoclassgc
2465 } else if (match_option(option, "-Xnoclassgc")) {
2466 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2467 return JNI_EINVAL;
2468 }
2469 // -Xconcgc
2470 } else if (match_option(option, "-Xconcgc")) {
2471 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2472 return JNI_EINVAL;
2473 }
2474 // -Xnoconcgc
2475 } else if (match_option(option, "-Xnoconcgc")) {
2476 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2477 return JNI_EINVAL;
2478 }
2479 // -Xbatch
2480 } else if (match_option(option, "-Xbatch")) {
2481 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2482 return JNI_EINVAL;
2483 }
2484 // -Xmn for compatibility with other JVM vendors
2485 } else if (match_option(option, "-Xmn", &tail)) {
2486 julong long_initial_young_size = 0;
2487 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2488 if (errcode != arg_in_range) {
2489 jio_fprintf(defaultStream::error_stream(),
2490 "Invalid initial young generation size: %s\n", option->optionString);
2491 describe_range_error(errcode);
2492 return JNI_EINVAL;
2493 }
2494 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2495 return JNI_EINVAL;
2496 }
2497 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2498 return JNI_EINVAL;
2499 }
2500 // -Xms
2501 } else if (match_option(option, "-Xms", &tail)) {
2502 julong long_initial_heap_size = 0;
2503 // an initial heap size of 0 means automatically determine
2504 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2505 if (errcode != arg_in_range) {
2506 jio_fprintf(defaultStream::error_stream(),
2507 "Invalid initial heap size: %s\n", option->optionString);
2508 describe_range_error(errcode);
2509 return JNI_EINVAL;
2510 }
2511 set_min_heap_size((size_t)long_initial_heap_size);
2512 // Currently the minimum size and the initial heap sizes are the same.
2513 // Can be overridden with -XX:InitialHeapSize.
2514 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2515 return JNI_EINVAL;
2516 }
2517 // -Xmx
2518 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2519 julong long_max_heap_size = 0;
2520 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2521 if (errcode != arg_in_range) {
2522 jio_fprintf(defaultStream::error_stream(),
2523 "Invalid maximum heap size: %s\n", option->optionString);
2524 describe_range_error(errcode);
2525 return JNI_EINVAL;
2526 }
2527 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2528 return JNI_EINVAL;
2529 }
2530 // Xmaxf
2531 } else if (match_option(option, "-Xmaxf", &tail)) {
2532 char* err;
2533 int maxf = (int)(strtod(tail, &err) * 100);
2534 if (*err != '\0' || *tail == '\0') {
2535 jio_fprintf(defaultStream::error_stream(),
2536 "Bad max heap free percentage size: %s\n",
2537 option->optionString);
2538 return JNI_EINVAL;
2539 } else {
2540 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2541 return JNI_EINVAL;
2542 }
2543 }
2544 // Xminf
2545 } else if (match_option(option, "-Xminf", &tail)) {
2546 char* err;
2547 int minf = (int)(strtod(tail, &err) * 100);
2548 if (*err != '\0' || *tail == '\0') {
2549 jio_fprintf(defaultStream::error_stream(),
2550 "Bad min heap free percentage size: %s\n",
2551 option->optionString);
2552 return JNI_EINVAL;
2553 } else {
2554 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2555 return JNI_EINVAL;
2556 }
2557 }
2558 // -Xss
2559 } else if (match_option(option, "-Xss", &tail)) {
2560 julong long_ThreadStackSize = 0;
2561 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2562 if (errcode != arg_in_range) {
2563 jio_fprintf(defaultStream::error_stream(),
2564 "Invalid thread stack size: %s\n", option->optionString);
2565 describe_range_error(errcode);
2566 return JNI_EINVAL;
2567 }
2568 // Internally track ThreadStackSize in units of 1024 bytes.
2569 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2570 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2571 return JNI_EINVAL;
2572 }
2573 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads
2574 } else if (match_option(option, "-Xoss", &tail) ||
2575 match_option(option, "-Xsqnopause") ||
2576 match_option(option, "-Xoptimize") ||
2577 match_option(option, "-Xboundthreads")) {
2578 // All these options are deprecated in JDK 9 and will be removed in a future release
2579 char version[256];
2580 JDK_Version::jdk(9).to_string(version, sizeof(version));
2581 warning("ignoring option %s; support was removed in %s", option->optionString, version);
2582 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2583 julong long_CodeCacheExpansionSize = 0;
2584 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2585 if (errcode != arg_in_range) {
2586 jio_fprintf(defaultStream::error_stream(),
2587 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2588 os::vm_page_size()/K);
2589 return JNI_EINVAL;
2590 }
2591 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2592 return JNI_EINVAL;
2593 }
2594 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2595 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2596 julong long_ReservedCodeCacheSize = 0;
2597
2598 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2599 if (errcode != arg_in_range) {
2600 jio_fprintf(defaultStream::error_stream(),
2601 "Invalid maximum code cache size: %s.\n", option->optionString);
2602 return JNI_EINVAL;
2603 }
2604 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2605 return JNI_EINVAL;
2606 }
2607 // -XX:NonNMethodCodeHeapSize=
2608 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2609 julong long_NonNMethodCodeHeapSize = 0;
2610
2611 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2612 if (errcode != arg_in_range) {
2613 jio_fprintf(defaultStream::error_stream(),
2614 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2615 return JNI_EINVAL;
2616 }
2617 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2618 return JNI_EINVAL;
2619 }
2620 // -XX:ProfiledCodeHeapSize=
2621 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2622 julong long_ProfiledCodeHeapSize = 0;
2623
2624 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2625 if (errcode != arg_in_range) {
2626 jio_fprintf(defaultStream::error_stream(),
2627 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2628 return JNI_EINVAL;
2629 }
2630 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
2631 return JNI_EINVAL;
2632 }
2633 // -XX:NonProfiledCodeHeapSizee=
2634 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2635 julong long_NonProfiledCodeHeapSize = 0;
2636
2637 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2638 if (errcode != arg_in_range) {
2639 jio_fprintf(defaultStream::error_stream(),
2640 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2641 return JNI_EINVAL;
2642 }
2643 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
2644 return JNI_EINVAL;
2645 }
2646 // -green
2647 } else if (match_option(option, "-green")) {
2648 jio_fprintf(defaultStream::error_stream(),
2649 "Green threads support not available\n");
2650 return JNI_EINVAL;
2651 // -native
2652 } else if (match_option(option, "-native")) {
2653 // HotSpot always uses native threads, ignore silently for compatibility
2654 // -Xrs
2655 } else if (match_option(option, "-Xrs")) {
2656 // Classic/EVM option, new functionality
2657 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2658 return JNI_EINVAL;
2659 }
2660 } else if (match_option(option, "-Xusealtsigs")) {
2661 // change default internal VM signals used - lower case for back compat
2662 if (FLAG_SET_CMDLINE(bool, UseAltSigs, true) != Flag::SUCCESS) {
2663 return JNI_EINVAL;
2664 }
2665 // -Xprof
2666 } else if (match_option(option, "-Xprof")) {
2667 #if INCLUDE_FPROF
2668 _has_profile = true;
2669 #else // INCLUDE_FPROF
2670 jio_fprintf(defaultStream::error_stream(),
2671 "Flat profiling is not supported in this VM.\n");
2672 return JNI_ERR;
2673 #endif // INCLUDE_FPROF
2674 // -Xconcurrentio
2675 } else if (match_option(option, "-Xconcurrentio")) {
2676 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2677 return JNI_EINVAL;
2678 }
2679 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2680 return JNI_EINVAL;
2681 }
2682 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2683 return JNI_EINVAL;
2684 }
2685 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2686 return JNI_EINVAL;
2687 }
2688 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2689 return JNI_EINVAL;
2690 }
2691
2692 // -Xinternalversion
2693 } else if (match_option(option, "-Xinternalversion")) {
2694 jio_fprintf(defaultStream::output_stream(), "%s\n",
2695 VM_Version::internal_vm_info_string());
2696 vm_exit(0);
2697 #ifndef PRODUCT
2698 // -Xprintflags
2699 } else if (match_option(option, "-Xprintflags")) {
2700 CommandLineFlags::printFlags(tty, false);
2701 vm_exit(0);
2702 #endif
2703 // -D
2704 } else if (match_option(option, "-D", &tail)) {
2705 const char* value;
2706 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2707 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2708 // abort if -Djava.endorsed.dirs is set
2709 jio_fprintf(defaultStream::output_stream(),
2710 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2711 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2712 return JNI_EINVAL;
2713 }
2714 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2715 *value != '\0' && strcmp(value, "\"\"") != 0) {
2716 // abort if -Djava.ext.dirs is set
2717 jio_fprintf(defaultStream::output_stream(),
2718 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2719 return JNI_EINVAL;
2720 }
2721
2722 if (!add_property(tail)) {
2723 return JNI_ENOMEM;
2724 }
2725 // Out of the box management support
2726 if (match_option(option, "-Dcom.sun.management", &tail)) {
2727 #if INCLUDE_MANAGEMENT
2728 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
2729 return JNI_EINVAL;
2730 }
2731 #else
2732 jio_fprintf(defaultStream::output_stream(),
2733 "-Dcom.sun.management is not supported in this VM.\n");
2734 return JNI_ERR;
2735 #endif
2736 }
2737 // -Xint
2738 } else if (match_option(option, "-Xint")) {
2739 set_mode_flags(_int);
2740 // -Xmixed
2741 } else if (match_option(option, "-Xmixed")) {
2742 set_mode_flags(_mixed);
2743 // -Xcomp
2744 } else if (match_option(option, "-Xcomp")) {
2745 // for testing the compiler; turn off all flags that inhibit compilation
2746 set_mode_flags(_comp);
2747 // -Xshare:dump
2748 } else if (match_option(option, "-Xshare:dump")) {
2749 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
2750 return JNI_EINVAL;
2751 }
2752 set_mode_flags(_int); // Prevent compilation, which creates objects
2753 // -Xshare:on
2754 } else if (match_option(option, "-Xshare:on")) {
2755 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2756 return JNI_EINVAL;
2757 }
2758 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
2759 return JNI_EINVAL;
2760 }
2761 // -Xshare:auto
2762 } else if (match_option(option, "-Xshare:auto")) {
2763 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2764 return JNI_EINVAL;
2765 }
2766 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2767 return JNI_EINVAL;
2768 }
2769 // -Xshare:off
2770 } else if (match_option(option, "-Xshare:off")) {
2771 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
2772 return JNI_EINVAL;
2773 }
2774 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2775 return JNI_EINVAL;
2776 }
2777 // -Xverify
2778 } else if (match_option(option, "-Xverify", &tail)) {
2779 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2780 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
2781 return JNI_EINVAL;
2782 }
2783 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
2784 return JNI_EINVAL;
2785 }
2786 } else if (strcmp(tail, ":remote") == 0) {
2787 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
2788 return JNI_EINVAL;
2789 }
2790 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
2791 return JNI_EINVAL;
2792 }
2793 } else if (strcmp(tail, ":none") == 0) {
2794 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
2795 return JNI_EINVAL;
2796 }
2797 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
2798 return JNI_EINVAL;
2799 }
2800 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2801 return JNI_EINVAL;
2802 }
2803 // -Xdebug
2804 } else if (match_option(option, "-Xdebug")) {
2805 // note this flag has been used, then ignore
2806 set_xdebug_mode(true);
2807 // -Xnoagent
2808 } else if (match_option(option, "-Xnoagent")) {
2809 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2810 } else if (match_option(option, "-Xloggc:", &tail)) {
2811 // Redirect GC output to the file. -Xloggc:<filename>
2812 // ostream_init_log(), when called will use this filename
2813 // to initialize a fileStream.
2814 _gc_log_filename = os::strdup_check_oom(tail);
2815 if (!is_filename_valid(_gc_log_filename)) {
2816 jio_fprintf(defaultStream::output_stream(),
2817 "Invalid file name for use with -Xloggc: Filename can only contain the "
2818 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2819 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2820 return JNI_EINVAL;
2821 }
2822 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
2823 return JNI_EINVAL;
2824 }
2825 if (FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true) != Flag::SUCCESS) {
2826 return JNI_EINVAL;
2827 }
2828 } else if (match_option(option, "-Xlog", &tail)) {
2829 bool ret = false;
2830 if (strcmp(tail, ":help") == 0) {
2831 LogConfiguration::print_command_line_help(defaultStream::output_stream());
2832 vm_exit(0);
2833 } else if (strcmp(tail, ":disable") == 0) {
2834 LogConfiguration::disable_logging();
2835 ret = true;
2836 } else if (*tail == '\0') {
2837 ret = LogConfiguration::parse_command_line_arguments();
2838 assert(ret, "-Xlog without arguments should never fail to parse");
2839 } else if (*tail == ':') {
2840 ret = LogConfiguration::parse_command_line_arguments(tail + 1);
2841 }
2842 if (ret == false) {
2843 jio_fprintf(defaultStream::error_stream(),
2844 "Invalid -Xlog option '-Xlog%s'\n",
2845 tail);
2846 return JNI_EINVAL;
2847 }
2848 // JNI hooks
2849 } else if (match_option(option, "-Xcheck", &tail)) {
2850 if (!strcmp(tail, ":jni")) {
2851 #if !INCLUDE_JNI_CHECK
2852 warning("JNI CHECKING is not supported in this VM");
2853 #else
2854 CheckJNICalls = true;
2855 #endif // INCLUDE_JNI_CHECK
2856 } else if (is_bad_option(option, args->ignoreUnrecognized,
2857 "check")) {
2858 return JNI_EINVAL;
2859 }
2860 } else if (match_option(option, "vfprintf")) {
2861 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2862 } else if (match_option(option, "exit")) {
2863 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2864 } else if (match_option(option, "abort")) {
2865 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2866 // -XX:+AggressiveHeap
2867 } else if (match_option(option, "-XX:+AggressiveHeap")) {
2868
2869 // This option inspects the machine and attempts to set various
2870 // parameters to be optimal for long-running, memory allocation
2871 // intensive jobs. It is intended for machines with large
2872 // amounts of cpu and memory.
2873
2874 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2875 // VM, but we may not be able to represent the total physical memory
2876 // available (like having 8gb of memory on a box but using a 32bit VM).
2877 // Thus, we need to make sure we're using a julong for intermediate
2878 // calculations.
2879 julong initHeapSize;
2880 julong total_memory = os::physical_memory();
2881
2882 if (total_memory < (julong)256*M) {
2883 jio_fprintf(defaultStream::error_stream(),
2884 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2885 vm_exit(1);
2886 }
2887
2888 // The heap size is half of available memory, or (at most)
2889 // all of possible memory less 160mb (leaving room for the OS
2890 // when using ISM). This is the maximum; because adaptive sizing
2891 // is turned on below, the actual space used may be smaller.
2892
2893 initHeapSize = MIN2(total_memory / (julong)2,
2894 total_memory - (julong)160*M);
2895
2896 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2897
2898 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2899 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2900 return JNI_EINVAL;
2901 }
2902 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2903 return JNI_EINVAL;
2904 }
2905 // Currently the minimum size and the initial heap sizes are the same.
2906 set_min_heap_size(initHeapSize);
2907 }
2908 if (FLAG_IS_DEFAULT(NewSize)) {
2909 // Make the young generation 3/8ths of the total heap.
2910 if (FLAG_SET_CMDLINE(size_t, NewSize,
2911 ((julong)MaxHeapSize / (julong)8) * (julong)3) != Flag::SUCCESS) {
2912 return JNI_EINVAL;
2913 }
2914 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2915 return JNI_EINVAL;
2916 }
2917 }
2918
2919 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2920 FLAG_SET_DEFAULT(UseLargePages, true);
2921 #endif
2922
2923 // Increase some data structure sizes for efficiency
2924 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2925 return JNI_EINVAL;
2926 }
2927 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2928 return JNI_EINVAL;
2929 }
2930 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256*K) != Flag::SUCCESS) {
2931 return JNI_EINVAL;
2932 }
2933
2934 // See the OldPLABSize comment below, but replace 'after promotion'
2935 // with 'after copying'. YoungPLABSize is the size of the survivor
2936 // space per-gc-thread buffers. The default is 4kw.
2937 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K) != Flag::SUCCESS) { // Note: this is in words
2938 return JNI_EINVAL;
2939 }
2940
2941 // OldPLABSize is the size of the buffers in the old gen that
2942 // UseParallelGC uses to promote live data that doesn't fit in the
2943 // survivor spaces. At any given time, there's one for each gc thread.
2944 // The default size is 1kw. These buffers are rarely used, since the
2945 // survivor spaces are usually big enough. For specjbb, however, there
2946 // are occasions when there's lots of live data in the young gen
2947 // and we end up promoting some of it. We don't have a definite
2948 // explanation for why bumping OldPLABSize helps, but the theory
2949 // is that a bigger PLAB results in retaining something like the
2950 // original allocation order after promotion, which improves mutator
2951 // locality. A minor effect may be that larger PLABs reduce the
2952 // number of PLAB allocation events during gc. The value of 8kw
2953 // was arrived at by experimenting with specjbb.
2954 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K) != Flag::SUCCESS) { // Note: this is in words
2955 return JNI_EINVAL;
2956 }
2957
2958 // Enable parallel GC and adaptive generation sizing
2959 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2960 return JNI_EINVAL;
2961 }
2962 FLAG_SET_DEFAULT(ParallelGCThreads,
2963 Abstract_VM_Version::parallel_worker_threads());
2964
2965 // Encourage steady state memory management
2966 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2967 return JNI_EINVAL;
2968 }
2969
2970 // This appears to improve mutator locality
2971 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2972 return JNI_EINVAL;
2973 }
2974
2975 // Get around early Solaris scheduling bug
2976 // (affinity vs other jobs on system)
2977 // but disallow DR and offlining (5008695).
2978 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2979 return JNI_EINVAL;
2980 }
2981
2982 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2983 // and the last option wins.
2984 } else if (match_option(option, "-XX:+NeverTenure")) {
2985 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
2986 return JNI_EINVAL;
2987 }
2988 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
2989 return JNI_EINVAL;
2990 }
2991 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
2992 return JNI_EINVAL;
2993 }
2994 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2995 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
2996 return JNI_EINVAL;
2997 }
2998 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
2999 return JNI_EINVAL;
3000 }
3001 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3002 return JNI_EINVAL;
3003 }
3004 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3005 uintx max_tenuring_thresh = 0;
3006 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3007 jio_fprintf(defaultStream::error_stream(),
3008 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3009 return JNI_EINVAL;
3010 }
3011
3012 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3013 return JNI_EINVAL;
3014 }
3015
3016 if (MaxTenuringThreshold == 0) {
3017 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3018 return JNI_EINVAL;
3019 }
3020 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3021 return JNI_EINVAL;
3022 }
3023 } else {
3024 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3025 return JNI_EINVAL;
3026 }
3027 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3028 return JNI_EINVAL;
3029 }
3030 }
3031 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3032 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3033 return JNI_EINVAL;
3034 }
3035 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3036 return JNI_EINVAL;
3037 }
3038 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3039 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3040 return JNI_EINVAL;
3041 }
3042 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3043 return JNI_EINVAL;
3044 }
3045 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3046 #if defined(DTRACE_ENABLED)
3047 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3048 return JNI_EINVAL;
3049 }
3050 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3051 return JNI_EINVAL;
3052 }
3053 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3054 return JNI_EINVAL;
3055 }
3056 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3057 return JNI_EINVAL;
3058 }
3059 #else // defined(DTRACE_ENABLED)
3060 jio_fprintf(defaultStream::error_stream(),
3061 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3062 return JNI_EINVAL;
3063 #endif // defined(DTRACE_ENABLED)
3064 #ifdef ASSERT
3065 } else if (match_option(option, "-XX:+FullGCALot")) {
3066 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3067 return JNI_EINVAL;
3068 }
3069 // disable scavenge before parallel mark-compact
3070 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3071 return JNI_EINVAL;
3072 }
3073 #endif
3074 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3075 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3076 julong stack_size = 0;
3077 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3078 if (errcode != arg_in_range) {
3079 jio_fprintf(defaultStream::error_stream(),
3080 "Invalid mark stack size: %s\n", option->optionString);
3081 describe_range_error(errcode);
3082 return JNI_EINVAL;
3083 }
3084 jio_fprintf(defaultStream::error_stream(),
3085 "Please use -XX:MarkStackSize in place of "
3086 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n");
3087 if (FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size) != Flag::SUCCESS) {
3088 return JNI_EINVAL;
3089 }
3090 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3091 julong max_stack_size = 0;
3092 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3093 if (errcode != arg_in_range) {
3094 jio_fprintf(defaultStream::error_stream(),
3095 "Invalid maximum mark stack size: %s\n",
3096 option->optionString);
3097 describe_range_error(errcode);
3098 return JNI_EINVAL;
3099 }
3100 jio_fprintf(defaultStream::error_stream(),
3101 "Please use -XX:MarkStackSizeMax in place of "
3102 "-XX:CMSMarkStackSizeMax in the future\n");
3103 if (FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size) != Flag::SUCCESS) {
3104 return JNI_EINVAL;
3105 }
3106 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3107 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3108 uintx conc_threads = 0;
3109 if (!parse_uintx(tail, &conc_threads, 1)) {
3110 jio_fprintf(defaultStream::error_stream(),
3111 "Invalid concurrent threads: %s\n", option->optionString);
3112 return JNI_EINVAL;
3113 }
3114 jio_fprintf(defaultStream::error_stream(),
3115 "Please use -XX:ConcGCThreads in place of "
3116 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n");
3117 if (FLAG_SET_CMDLINE(uint, ConcGCThreads, conc_threads) != Flag::SUCCESS) {
3118 return JNI_EINVAL;
3119 }
3120 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3121 julong max_direct_memory_size = 0;
3122 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3123 if (errcode != arg_in_range) {
3124 jio_fprintf(defaultStream::error_stream(),
3125 "Invalid maximum direct memory size: %s\n",
3126 option->optionString);
3127 describe_range_error(errcode);
3128 return JNI_EINVAL;
3129 }
3130 if (FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size) != Flag::SUCCESS) {
3131 return JNI_EINVAL;
3132 }
3133 #if !INCLUDE_MANAGEMENT
3134 } else if (match_option(option, "-XX:+ManagementServer")) {
3135 jio_fprintf(defaultStream::error_stream(),
3136 "ManagementServer is not supported in this VM.\n");
3137 return JNI_ERR;
3138 #endif // INCLUDE_MANAGEMENT
3139 // CreateMinidumpOnCrash is removed, and replaced by CreateCoredumpOnCrash
3140 } else if (match_option(option, "-XX:+CreateMinidumpOnCrash")) {
3141 if (FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, true) != Flag::SUCCESS) {
3142 return JNI_EINVAL;
3143 }
3144 jio_fprintf(defaultStream::output_stream(),
3145 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is on\n");
3146 } else if (match_option(option, "-XX:-CreateMinidumpOnCrash")) {
3147 if (FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, false) != Flag::SUCCESS) {
3148 return JNI_EINVAL;
3149 }
3150 jio_fprintf(defaultStream::output_stream(),
3151 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is off\n");
3152 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3153 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have
3154 // already been handled
3155 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) &&
3156 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) {
3157 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3158 return JNI_EINVAL;
3159 }
3160 }
3161 // Unknown option
3162 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3163 return JNI_ERR;
3164 }
3165 }
3166
3167 // PrintSharedArchiveAndExit will turn on
3168 // -Xshare:on
3169 // -XX:+TraceClassPaths
3170 if (PrintSharedArchiveAndExit) {
3171 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3172 return JNI_EINVAL;
3173 }
3174 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3175 return JNI_EINVAL;
3176 }
3177 if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) {
3178 return JNI_EINVAL;
3179 }
3180 }
3181
3182 // Change the default value for flags which have different default values
3183 // when working with older JDKs.
3184 #ifdef LINUX
3185 if (JDK_Version::current().compare_major(6) <= 0 &&
3186 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3187 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3188 }
3189 #endif // LINUX
3190 fix_appclasspath();
3191 return JNI_OK;
3192 }
3193
3194 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3195 //
3196 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3197 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3198 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3199 // path is treated as the current directory.
3200 //
3201 // This causes problems with CDS, which requires that all directories specified in the classpath
3202 // must be empty. In most cases, applications do NOT want to load classes from the current
3203 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3204 // scripts compatible with CDS.
3205 void Arguments::fix_appclasspath() {
3206 if (IgnoreEmptyClassPaths) {
3207 const char separator = *os::path_separator();
3208 const char* src = _java_class_path->value();
3209
3210 // skip over all the leading empty paths
3211 while (*src == separator) {
3212 src ++;
3213 }
3214
3215 char* copy = os::strdup_check_oom(src, mtInternal);
3216
3217 // trim all trailing empty paths
3218 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3219 *tail = '\0';
3220 }
3221
3222 char from[3] = {separator, separator, '\0'};
3223 char to [2] = {separator, '\0'};
3224 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3225 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3226 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3227 }
3228
3229 _java_class_path->set_value(copy);
3230 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3231 }
3232
3233 if (!PrintSharedArchiveAndExit) {
3234 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3235 }
3236 }
3237
3238 static bool has_jar_files(const char* directory) {
3239 DIR* dir = os::opendir(directory);
3240 if (dir == NULL) return false;
3241
3242 struct dirent *entry;
3243 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3244 bool hasJarFile = false;
3245 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3246 const char* name = entry->d_name;
3247 const char* ext = name + strlen(name) - 4;
3248 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3249 }
3250 FREE_C_HEAP_ARRAY(char, dbuf);
3251 os::closedir(dir);
3252 return hasJarFile ;
3253 }
3254
3255 static int check_non_empty_dirs(const char* path) {
3256 const char separator = *os::path_separator();
3257 const char* const end = path + strlen(path);
3258 int nonEmptyDirs = 0;
3259 while (path < end) {
3260 const char* tmp_end = strchr(path, separator);
3261 if (tmp_end == NULL) {
3262 if (has_jar_files(path)) {
3263 nonEmptyDirs++;
3264 jio_fprintf(defaultStream::output_stream(),
3265 "Non-empty directory: %s\n", path);
3266 }
3267 path = end;
3268 } else {
3269 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3270 memcpy(dirpath, path, tmp_end - path);
3271 dirpath[tmp_end - path] = '\0';
3272 if (has_jar_files(dirpath)) {
3273 nonEmptyDirs++;
3274 jio_fprintf(defaultStream::output_stream(),
3275 "Non-empty directory: %s\n", dirpath);
3276 }
3277 FREE_C_HEAP_ARRAY(char, dirpath);
3278 path = tmp_end + 1;
3279 }
3280 }
3281 return nonEmptyDirs;
3282 }
3283
3284 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3285 // check if the default lib/endorsed directory exists; if so, error
3286 char path[JVM_MAXPATHLEN];
3287 const char* fileSep = os::file_separator();
3288 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3289
3290 if (CheckEndorsedAndExtDirs) {
3291 int nonEmptyDirs = 0;
3292 // check endorsed directory
3293 nonEmptyDirs += check_non_empty_dirs(path);
3294 // check the extension directories
3295 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3296 if (nonEmptyDirs > 0) {
3297 return JNI_ERR;
3298 }
3299 }
3300
3301 DIR* dir = os::opendir(path);
3302 if (dir != NULL) {
3303 jio_fprintf(defaultStream::output_stream(),
3304 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3305 "in modular form will be supported via the concept of upgradeable modules.\n");
3306 os::closedir(dir);
3307 return JNI_ERR;
3308 }
3309
3310 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3311 dir = os::opendir(path);
3312 if (dir != NULL) {
3313 jio_fprintf(defaultStream::output_stream(),
3314 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3315 "Use -classpath instead.\n.");
3316 os::closedir(dir);
3317 return JNI_ERR;
3318 }
3319
3320 if (scp_assembly_required) {
3321 // Assemble the bootclasspath elements into the final path.
3322 char *combined_path = scp_p->combined_path();
3323 Arguments::set_sysclasspath(combined_path);
3324 FREE_C_HEAP_ARRAY(char, combined_path);
3325 }
3326
3327 // This must be done after all arguments have been processed.
3328 // java_compiler() true means set to "NONE" or empty.
3329 if (java_compiler() && !xdebug_mode()) {
3330 // For backwards compatibility, we switch to interpreted mode if
3331 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3332 // not specified.
3333 set_mode_flags(_int);
3334 }
3335
3336 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3337 // but like -Xint, leave compilation thresholds unaffected.
3338 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3339 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3340 set_mode_flags(_int);
3341 }
3342
3343 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3344 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3345 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3346 }
3347
3348 #ifndef COMPILER2
3349 // Don't degrade server performance for footprint
3350 if (FLAG_IS_DEFAULT(UseLargePages) &&
3351 MaxHeapSize < LargePageHeapSizeThreshold) {
3352 // No need for large granularity pages w/small heaps.
3353 // Note that large pages are enabled/disabled for both the
3354 // Java heap and the code cache.
3355 FLAG_SET_DEFAULT(UseLargePages, false);
3356 }
3357
3358 #else
3359 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3360 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3361 }
3362 #endif
3363
3364 #ifndef TIERED
3365 // Tiered compilation is undefined.
3366 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3367 #endif
3368
3369 // If we are running in a headless jre, force java.awt.headless property
3370 // to be true unless the property has already been set.
3371 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3372 if (os::is_headless_jre()) {
3373 const char* headless = Arguments::get_property("java.awt.headless");
3374 if (headless == NULL) {
3375 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3376 if (headless_env == NULL) {
3377 if (!add_property("java.awt.headless=true")) {
3378 return JNI_ENOMEM;
3379 }
3380 } else {
3381 char buffer[256];
3382 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3383 if (!add_property(buffer)) {
3384 return JNI_ENOMEM;
3385 }
3386 }
3387 }
3388 }
3389
3390 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3391 // CMS can only be used with ParNew
3392 FLAG_SET_ERGO(bool, UseParNewGC, true);
3393 }
3394
3395 if (!check_vm_args_consistency()) {
3396 return JNI_ERR;
3397 }
3398
3399 return JNI_OK;
3400 }
3401
3402 // Helper class for controlling the lifetime of JavaVMInitArgs
3403 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3404 // deleted on the destruction of the ScopedVMInitArgs object.
3405 class ScopedVMInitArgs : public StackObj {
3406 private:
3407 JavaVMInitArgs _args;
3408 bool _is_set;
3409
3410 public:
3411 ScopedVMInitArgs() {
3412 _args.version = JNI_VERSION_1_2;
3413 _args.nOptions = 0;
3414 _args.options = NULL;
3415 _args.ignoreUnrecognized = false;
3416 _is_set = false;
3417 }
3418
3419 // Populates the JavaVMInitArgs object represented by this
3420 // ScopedVMInitArgs object with the arguments in options. The
3421 // allocated memory is deleted by the destructor. If this method
3422 // returns anything other than JNI_OK, then this object is in a
3423 // partially constructed state, and should be abandoned.
3424 jint set_args(GrowableArray<JavaVMOption>* options) {
3425 _is_set = true;
3426 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3427 JavaVMOption, options->length(), mtInternal);
3428 if (options_arr == NULL) {
3429 return JNI_ENOMEM;
3430 }
3431 _args.options = options_arr;
3432
3433 for (int i = 0; i < options->length(); i++) {
3434 options_arr[i] = options->at(i);
3435 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3436 if (options_arr[i].optionString == NULL) {
3437 // Rely on the destructor to do cleanup.
3438 _args.nOptions = i;
3439 return JNI_ENOMEM;
3440 }
3441 }
3442
3443 _args.nOptions = options->length();
3444 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3445 return JNI_OK;
3446 }
3447
3448 JavaVMInitArgs* get() { return &_args; }
3449 bool is_set() { return _is_set; }
3450
3451 ~ScopedVMInitArgs() {
3452 if (_args.options == NULL) return;
3453 for (int i = 0; i < _args.nOptions; i++) {
3454 os::free(_args.options[i].optionString);
3455 }
3456 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3457 }
3458
3459 // Insert options into this option list, to replace option at
3460 // vm_options_file_pos (-XX:VMOptionsFile)
3461 jint insert(const JavaVMInitArgs* args,
3462 const JavaVMInitArgs* args_to_insert,
3463 const int vm_options_file_pos) {
3464 assert(_args.options == NULL, "shouldn't be set yet");
3465 assert(args_to_insert->nOptions != 0, "there should be args to insert");
3466 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set");
3467
3468 int length = args->nOptions + args_to_insert->nOptions - 1;
3469 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal)
3470 GrowableArray<JavaVMOption>(length, true); // Construct new option array
3471 for (int i = 0; i < args->nOptions; i++) {
3472 if (i == vm_options_file_pos) {
3473 // insert the new options starting at the same place as the
3474 // -XX:VMOptionsFile option
3475 for (int j = 0; j < args_to_insert->nOptions; j++) {
3476 options->push(args_to_insert->options[j]);
3477 }
3478 } else {
3479 options->push(args->options[i]);
3480 }
3481 }
3482 // make into options array
3483 jint result = set_args(options);
3484 delete options;
3485 return result;
3486 }
3487 };
3488
3489 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3490 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3491 }
3492
3493 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3494 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3495 }
3496
3497 jint Arguments::parse_options_environment_variable(const char* name,
3498 ScopedVMInitArgs* vm_args) {
3499 char *buffer = ::getenv(name);
3500
3501 // Don't check this environment variable if user has special privileges
3502 // (e.g. unix su command).
3503 if (buffer == NULL || os::have_special_privileges()) {
3504 return JNI_OK;
3505 }
3506
3507 if ((buffer = os::strdup(buffer)) == NULL) {
3508 return JNI_ENOMEM;
3509 }
3510
3511 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args);
3512
3513 os::free(buffer);
3514 return retcode;
3515 }
3516
3517 const int OPTION_BUFFER_SIZE = 1024;
3518
3519 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) {
3520 // read file into buffer
3521 int fd = ::open(file_name, O_RDONLY);
3522 if (fd < 0) {
3523 jio_fprintf(defaultStream::error_stream(),
3524 "Could not open options file '%s'\n",
3525 file_name);
3526 return JNI_ERR;
3527 }
3528
3529 // '+ 1' for NULL termination even with max bytes
3530 int bytes_alloc = OPTION_BUFFER_SIZE + 1;
3531
3532 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtInternal);
3533 if (NULL == buf) {
3534 jio_fprintf(defaultStream::error_stream(),
3535 "Could not allocate read buffer for options file parse\n");
3536 os::close(fd);
3537 return JNI_ENOMEM;
3538 }
3539
3540 memset(buf, 0, (unsigned)bytes_alloc);
3541
3542 // Fill buffer
3543 // Use ::read() instead of os::read because os::read()
3544 // might do a thread state transition
3545 // and it is too early for that here
3546
3547 int bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc);
3548 os::close(fd);
3549 if (bytes_read < 0) {
3550 FREE_C_HEAP_ARRAY(char, buf);
3551 jio_fprintf(defaultStream::error_stream(),
3552 "Could not read options file '%s'\n", file_name);
3553 return JNI_ERR;
3554 }
3555
3556 if (bytes_read == 0) {
3557 // tell caller there is no option data and that is ok
3558 FREE_C_HEAP_ARRAY(char, buf);
3559 return JNI_OK;
3560 }
3561
3562 // file is larger than OPTION_BUFFER_SIZE
3563 if (bytes_read > bytes_alloc - 1) {
3564 FREE_C_HEAP_ARRAY(char, buf);
3565 jio_fprintf(defaultStream::error_stream(),
3566 "Options file '%s' is larger than %d bytes.\n",
3567 file_name, bytes_alloc - 1);
3568 return JNI_EINVAL;
3569 }
3570
3571 int retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args);
3572
3573 FREE_C_HEAP_ARRAY(char, buf);
3574 return retcode;
3575 }
3576
3577 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) {
3578 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3579
3580 // some pointers to help with parsing
3581 char *buffer_end = buffer + buf_len;
3582 char *opt_hd = buffer;
3583 char *wrt = buffer;
3584 char *rd = buffer;
3585
3586 // parse all options
3587 while (rd < buffer_end) {
3588 // skip leading white space from the input string
3589 while (rd < buffer_end && isspace(*rd)) {
3590 rd++;
3591 }
3592
3593 if (rd >= buffer_end) {
3594 break;
3595 }
3596
3597 // Remember this is where we found the head of the token.
3598 opt_hd = wrt;
3599
3600 // Tokens are strings of non white space characters separated
3601 // by one or more white spaces.
3602 while (rd < buffer_end && !isspace(*rd)) {
3603 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3604 int quote = *rd; // matching quote to look for
3605 rd++; // don't copy open quote
3606 while (rd < buffer_end && *rd != quote) {
3607 // include everything (even spaces)
3608 // up until the close quote
3609 *wrt++ = *rd++; // copy to option string
3610 }
3611
3612 if (rd < buffer_end) {
3613 rd++; // don't copy close quote
3614 } else {
3615 // did not see closing quote
3616 jio_fprintf(defaultStream::error_stream(),
3617 "Unmatched quote in %s\n", name);
3618 delete options;
3619 return JNI_ERR;
3620 }
3621 } else {
3622 *wrt++ = *rd++; // copy to option string
3623 }
3624 }
3625
3626 // steal a white space character and set it to NULL
3627 *wrt++ = '\0';
3628 // We now have a complete token
3629
3630 JavaVMOption option;
3631 option.optionString = opt_hd;
3632
3633 options->append(option); // Fill in option
3634
3635 rd++; // Advance to next character
3636 }
3637
3638 // Fill out JavaVMInitArgs structure.
3639 jint status = vm_args->set_args(options);
3640
3641 delete options;
3642 return status;
3643 }
3644
3645 void Arguments::set_shared_spaces_flags() {
3646 if (DumpSharedSpaces) {
3647 if (RequireSharedSpaces) {
3648 warning("cannot dump shared archive while using shared archive");
3649 }
3650 UseSharedSpaces = false;
3651 #ifdef _LP64
3652 if (!UseCompressedOops || !UseCompressedClassPointers) {
3653 vm_exit_during_initialization(
3654 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3655 }
3656 } else {
3657 if (!UseCompressedOops || !UseCompressedClassPointers) {
3658 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3659 }
3660 #endif
3661 }
3662 }
3663
3664 #if !INCLUDE_ALL_GCS
3665 static void force_serial_gc() {
3666 FLAG_SET_DEFAULT(UseSerialGC, true);
3667 UNSUPPORTED_GC_OPTION(UseG1GC);
3668 UNSUPPORTED_GC_OPTION(UseParallelGC);
3669 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3670 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3671 UNSUPPORTED_GC_OPTION(UseParNewGC);
3672 }
3673 #endif // INCLUDE_ALL_GCS
3674
3675 // Sharing support
3676 // Construct the path to the archive
3677 static char* get_shared_archive_path() {
3678 char *shared_archive_path;
3679 if (SharedArchiveFile == NULL) {
3680 char jvm_path[JVM_MAXPATHLEN];
3681 os::jvm_path(jvm_path, sizeof(jvm_path));
3682 char *end = strrchr(jvm_path, *os::file_separator());
3683 if (end != NULL) *end = '\0';
3684 size_t jvm_path_len = strlen(jvm_path);
3685 size_t file_sep_len = strlen(os::file_separator());
3686 const size_t len = jvm_path_len + file_sep_len + 20;
3687 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3688 if (shared_archive_path != NULL) {
3689 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3690 jvm_path, os::file_separator());
3691 }
3692 } else {
3693 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3694 }
3695 return shared_archive_path;
3696 }
3697
3698 #ifndef PRODUCT
3699 // Determine whether LogVMOutput should be implicitly turned on.
3700 static bool use_vm_log() {
3701 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3702 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3703 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3704 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3705 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3706 return true;
3707 }
3708
3709 #ifdef COMPILER1
3710 if (PrintC1Statistics) {
3711 return true;
3712 }
3713 #endif // COMPILER1
3714
3715 #ifdef COMPILER2
3716 if (PrintOptoAssembly || PrintOptoStatistics) {
3717 return true;
3718 }
3719 #endif // COMPILER2
3720
3721 return false;
3722 }
3723
3724 #endif // PRODUCT
3725
3726 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args,
3727 char** flags_file,
3728 char** vm_options_file,
3729 const int vm_options_file_pos,
3730 ScopedVMInitArgs *vm_options_file_args,
3731 ScopedVMInitArgs* args_out) {
3732 jint code = parse_vm_options_file(*vm_options_file, vm_options_file_args);
3733 if (code != JNI_OK) {
3734 return code;
3735 }
3736
3737 // Now set global settings from the vm_option file, giving an error if
3738 // it has VMOptionsFile in it
3739 code = match_special_option_and_act(vm_options_file_args->get(), flags_file,
3740 NULL, NULL, NULL);
3741 if (code != JNI_OK) {
3742 return code;
3743 }
3744
3745 if (vm_options_file_args->get()->nOptions < 1) {
3746 return 0;
3747 }
3748
3749 return args_out->insert(args, vm_options_file_args->get(),
3750 vm_options_file_pos);
3751 }
3752
3753 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args,
3754 char ** flags_file,
3755 char ** vm_options_file,
3756 ScopedVMInitArgs* vm_options_file_args,
3757 ScopedVMInitArgs* args_out) {
3758 // Remaining part of option string
3759 const char* tail;
3760 int vm_options_file_pos = -1;
3761
3762 for (int index = 0; index < args->nOptions; index++) {
3763 const JavaVMOption* option = args->options + index;
3764 if (ArgumentsExt::process_options(option)) {
3765 continue;
3766 }
3767 if (match_option(option, "-XX:Flags=", &tail)) {
3768 *flags_file = (char *) tail;
3769 if (*flags_file == NULL) {
3770 jio_fprintf(defaultStream::error_stream(),
3771 "Cannot copy flags_file name.\n");
3772 return JNI_ENOMEM;
3773 }
3774 continue;
3775 }
3776 if (match_option(option, "-XX:VMOptionsFile=", &tail)) {
3777 if (vm_options_file != NULL) {
3778 // The caller accepts -XX:VMOptionsFile
3779 if (*vm_options_file != NULL) {
3780 jio_fprintf(defaultStream::error_stream(),
3781 "Only one VM Options file is supported "
3782 "on the command line\n");
3783 return JNI_EINVAL;
3784 }
3785
3786 *vm_options_file = (char *) tail;
3787 vm_options_file_pos = index; // save position of -XX:VMOptionsFile
3788 if (*vm_options_file == NULL) {
3789 jio_fprintf(defaultStream::error_stream(),
3790 "Cannot copy vm_options_file name.\n");
3791 return JNI_ENOMEM;
3792 }
3793 } else {
3794 jio_fprintf(defaultStream::error_stream(),
3795 "VM options file is only supported on the command line\n");
3796 return JNI_EINVAL;
3797 }
3798 continue;
3799 }
3800 if (match_option(option, "-XX:+PrintVMOptions")) {
3801 PrintVMOptions = true;
3802 continue;
3803 }
3804 if (match_option(option, "-XX:-PrintVMOptions")) {
3805 PrintVMOptions = false;
3806 continue;
3807 }
3808 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3809 IgnoreUnrecognizedVMOptions = true;
3810 continue;
3811 }
3812 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3813 IgnoreUnrecognizedVMOptions = false;
3814 continue;
3815 }
3816 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3817 CommandLineFlags::printFlags(tty, false);
3818 vm_exit(0);
3819 }
3820 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3821 #if INCLUDE_NMT
3822 // The launcher did not setup nmt environment variable properly.
3823 if (!MemTracker::check_launcher_nmt_support(tail)) {
3824 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3825 }
3826
3827 // Verify if nmt option is valid.
3828 if (MemTracker::verify_nmt_option()) {
3829 // Late initialization, still in single-threaded mode.
3830 if (MemTracker::tracking_level() >= NMT_summary) {
3831 MemTracker::init();
3832 }
3833 } else {
3834 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3835 }
3836 continue;
3837 #else
3838 jio_fprintf(defaultStream::error_stream(),
3839 "Native Memory Tracking is not supported in this VM\n");
3840 return JNI_ERR;
3841 #endif
3842 }
3843
3844 #ifndef PRODUCT
3845 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3846 CommandLineFlags::printFlags(tty, true);
3847 vm_exit(0);
3848 }
3849 #endif
3850 }
3851
3852 // If there's a VMOptionsFile, parse that (also can set flags_file)
3853 if ((vm_options_file != NULL) && (*vm_options_file != NULL)) {
3854 return insert_vm_options_file(args, flags_file, vm_options_file,
3855 vm_options_file_pos, vm_options_file_args, args_out);
3856 }
3857 return JNI_OK;
3858 }
3859
3860 static void print_options(const JavaVMInitArgs *args) {
3861 const char* tail;
3862 for (int index = 0; index < args->nOptions; index++) {
3863 const JavaVMOption *option = args->options + index;
3864 if (match_option(option, "-XX:", &tail)) {
3865 logOption(tail);
3866 }
3867 }
3868 }
3869
3870 // Parse entry point called from JNI_CreateJavaVM
3871
3872 jint Arguments::parse(const JavaVMInitArgs* args) {
3873
3874 // Initialize ranges and constraints
3875 CommandLineFlagRangeList::init();
3876 CommandLineFlagConstraintList::init();
3877
3878 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3879 const char* hotspotrc = ".hotspotrc";
3880 char* flags_file = NULL;
3881 char* vm_options_file = NULL;
3882 bool settings_file_specified = false;
3883 bool needs_hotspotrc_warning = false;
3884 ScopedVMInitArgs java_tool_options_args;
3885 ScopedVMInitArgs java_options_args;
3886 ScopedVMInitArgs modified_cmd_line_args;
3887 // Pass in vm_options_file_args to keep memory for flags_file from being
3888 // deallocated if found in the vm options file.
3889 ScopedVMInitArgs vm_options_file_args;
3890
3891 jint code =
3892 parse_java_tool_options_environment_variable(&java_tool_options_args);
3893 if (code != JNI_OK) {
3894 return code;
3895 }
3896
3897 code = parse_java_options_environment_variable(&java_options_args);
3898 if (code != JNI_OK) {
3899 return code;
3900 }
3901
3902 code = match_special_option_and_act(java_tool_options_args.get(),
3903 &flags_file, NULL, NULL, NULL);
3904 if (code != JNI_OK) {
3905 return code;
3906 }
3907
3908 code = match_special_option_and_act(args, &flags_file, &vm_options_file,
3909 &vm_options_file_args,
3910 &modified_cmd_line_args);
3911 if (code != JNI_OK) {
3912 return code;
3913 }
3914
3915
3916 // The command line arguments have been modified to include VMOptionsFile arguments.
3917 if (modified_cmd_line_args.is_set()) {
3918 args = modified_cmd_line_args.get();
3919 }
3920
3921 code = match_special_option_and_act(java_options_args.get(), &flags_file,
3922 NULL, NULL, NULL);
3923 if (code != JNI_OK) {
3924 return code;
3925 }
3926
3927 settings_file_specified = (flags_file != NULL);
3928
3929 if (IgnoreUnrecognizedVMOptions) {
3930 // uncast const to modify the flag args->ignoreUnrecognized
3931 *(jboolean*)(&args->ignoreUnrecognized) = true;
3932 java_tool_options_args.get()->ignoreUnrecognized = true;
3933 java_options_args.get()->ignoreUnrecognized = true;
3934 }
3935
3936 // Parse specified settings file
3937 if (settings_file_specified) {
3938 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3939 return JNI_EINVAL;
3940 }
3941 } else {
3942 #ifdef ASSERT
3943 // Parse default .hotspotrc settings file
3944 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3945 return JNI_EINVAL;
3946 }
3947 #else
3948 struct stat buf;
3949 if (os::stat(hotspotrc, &buf) == 0) {
3950 needs_hotspotrc_warning = true;
3951 }
3952 #endif
3953 }
3954
3955 if (PrintVMOptions) {
3956 print_options(java_tool_options_args.get());
3957 print_options(args);
3958 print_options(java_options_args.get());
3959 }
3960
3961 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3962 jint result = parse_vm_init_args(java_tool_options_args.get(),
3963 java_options_args.get(),
3964 args); // command line arguments
3965
3966 if (result != JNI_OK) {
3967 return result;
3968 }
3969
3970 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3971 SharedArchivePath = get_shared_archive_path();
3972 if (SharedArchivePath == NULL) {
3973 return JNI_ENOMEM;
3974 }
3975
3976 // Set up VerifySharedSpaces
3977 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3978 VerifySharedSpaces = true;
3979 }
3980
3981 // Delay warning until here so that we've had a chance to process
3982 // the -XX:-PrintWarnings flag
3983 if (needs_hotspotrc_warning) {
3984 warning("%s file is present but has been ignored. "
3985 "Run with -XX:Flags=%s to load the file.",
3986 hotspotrc, hotspotrc);
3987 }
3988
3989 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3990 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3991 #endif
3992
3993 ArgumentsExt::report_unsupported_options();
3994
3995 #ifndef PRODUCT
3996 if (TraceBytecodesAt != 0) {
3997 TraceBytecodes = true;
3998 }
3999 if (CountCompiledCalls) {
4000 if (UseCounterDecay) {
4001 warning("UseCounterDecay disabled because CountCalls is set");
4002 UseCounterDecay = false;
4003 }
4004 }
4005 #endif // PRODUCT
4006
4007 if (ScavengeRootsInCode == 0) {
4008 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
4009 warning("forcing ScavengeRootsInCode non-zero");
4010 }
4011 ScavengeRootsInCode = 1;
4012 }
4013
4014 if (PrintGCDetails) {
4015 // Turn on -verbose:gc options as well
4016 PrintGC = true;
4017 }
4018
4019 // Set object alignment values.
4020 set_object_alignment();
4021
4022 #if !INCLUDE_ALL_GCS
4023 force_serial_gc();
4024 #endif // INCLUDE_ALL_GCS
4025 #if !INCLUDE_CDS
4026 if (DumpSharedSpaces || RequireSharedSpaces) {
4027 jio_fprintf(defaultStream::error_stream(),
4028 "Shared spaces are not supported in this VM\n");
4029 return JNI_ERR;
4030 }
4031 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
4032 warning("Shared spaces are not supported in this VM");
4033 FLAG_SET_DEFAULT(UseSharedSpaces, false);
4034 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
4035 }
4036 no_shared_spaces("CDS Disabled");
4037 #endif // INCLUDE_CDS
4038
4039 return JNI_OK;
4040 }
4041
4042 jint Arguments::apply_ergo() {
4043
4044 // Set flags based on ergonomics.
4045 set_ergonomics_flags();
4046
4047 set_shared_spaces_flags();
4048
4049 // Check the GC selections again.
4050 if (!check_gc_consistency()) {
4051 return JNI_EINVAL;
4052 }
4053
4054 if (TieredCompilation) {
4055 set_tiered_flags();
4056 } else {
4057 int max_compilation_policy_choice = 1;
4058 #ifdef COMPILER2
4059 max_compilation_policy_choice = 2;
4060 #endif
4061 // Check if the policy is valid.
4062 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
4063 vm_exit_during_initialization(
4064 "Incompatible compilation policy selected", NULL);
4065 }
4066 // Scale CompileThreshold
4067 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
4068 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
4069 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
4070 }
4071 }
4072
4073 #ifdef COMPILER2
4074 #ifndef PRODUCT
4075 if (PrintIdealGraphLevel > 0) {
4076 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
4077 }
4078 #endif
4079 #endif
4080
4081 // Set heap size based on available physical memory
4082 set_heap_size();
4083
4084 ArgumentsExt::set_gc_specific_flags();
4085
4086 // Initialize Metaspace flags and alignments
4087 Metaspace::ergo_initialize();
4088
4089 // Set bytecode rewriting flags
4090 set_bytecode_flags();
4091
4092 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
4093 jint code = set_aggressive_opts_flags();
4094 if (code != JNI_OK) {
4095 return code;
4096 }
4097
4098 // Turn off biased locking for locking debug mode flags,
4099 // which are subtly different from each other but neither works with
4100 // biased locking
4101 if (UseHeavyMonitors
4102 #ifdef COMPILER1
4103 || !UseFastLocking
4104 #endif // COMPILER1
4105 ) {
4106 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
4107 // flag set to true on command line; warn the user that they
4108 // can't enable biased locking here
4109 warning("Biased Locking is not supported with locking debug flags"
4110 "; ignoring UseBiasedLocking flag." );
4111 }
4112 UseBiasedLocking = false;
4113 }
4114
4115 #ifdef ZERO
4116 // Clear flags not supported on zero.
4117 FLAG_SET_DEFAULT(ProfileInterpreter, false);
4118 FLAG_SET_DEFAULT(UseBiasedLocking, false);
4119 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
4120 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
4121 #endif // CC_INTERP
4122
4123 #ifdef COMPILER2
4124 if (!EliminateLocks) {
4125 EliminateNestedLocks = false;
4126 }
4127 if (!Inline) {
4128 IncrementalInline = false;
4129 }
4130 #ifndef PRODUCT
4131 if (!IncrementalInline) {
4132 AlwaysIncrementalInline = false;
4133 }
4134 #endif
4135 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
4136 // nothing to use the profiling, turn if off
4137 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
4138 }
4139 #endif
4140
4141 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
4142 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
4143 DebugNonSafepoints = true;
4144 }
4145
4146 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4147 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4148 }
4149
4150 #ifndef PRODUCT
4151 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4152 if (use_vm_log()) {
4153 LogVMOutput = true;
4154 }
4155 }
4156 #endif // PRODUCT
4157
4158 if (PrintCommandLineFlags) {
4159 CommandLineFlags::printSetFlags(tty);
4160 }
4161
4162 // Apply CPU specific policy for the BiasedLocking
4163 if (UseBiasedLocking) {
4164 if (!VM_Version::use_biased_locking() &&
4165 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4166 UseBiasedLocking = false;
4167 }
4168 }
4169 #ifdef COMPILER2
4170 if (!UseBiasedLocking || EmitSync != 0) {
4171 UseOptoBiasInlining = false;
4172 }
4173 #endif
4174
4175 return JNI_OK;
4176 }
4177
4178 jint Arguments::adjust_after_os() {
4179 if (UseNUMA) {
4180 if (UseParallelGC || UseParallelOldGC) {
4181 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4182 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4183 }
4184 }
4185 // UseNUMAInterleaving is set to ON for all collectors and
4186 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4187 // such as the parallel collector for Linux and Solaris will
4188 // interleave old gen and survivor spaces on top of NUMA
4189 // allocation policy for the eden space.
4190 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4191 // all platforms and ParallelGC on Windows will interleave all
4192 // of the heap spaces across NUMA nodes.
4193 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4194 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4195 }
4196 }
4197 return JNI_OK;
4198 }
4199
4200 int Arguments::PropertyList_count(SystemProperty* pl) {
4201 int count = 0;
4202 while(pl != NULL) {
4203 count++;
4204 pl = pl->next();
4205 }
4206 return count;
4207 }
4208
4209 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4210 assert(key != NULL, "just checking");
4211 SystemProperty* prop;
4212 for (prop = pl; prop != NULL; prop = prop->next()) {
4213 if (strcmp(key, prop->key()) == 0) return prop->value();
4214 }
4215 return NULL;
4216 }
4217
4218 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4219 int count = 0;
4220 const char* ret_val = NULL;
4221
4222 while(pl != NULL) {
4223 if(count >= index) {
4224 ret_val = pl->key();
4225 break;
4226 }
4227 count++;
4228 pl = pl->next();
4229 }
4230
4231 return ret_val;
4232 }
4233
4234 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4235 int count = 0;
4236 char* ret_val = NULL;
4237
4238 while(pl != NULL) {
4239 if(count >= index) {
4240 ret_val = pl->value();
4241 break;
4242 }
4243 count++;
4244 pl = pl->next();
4245 }
4246
4247 return ret_val;
4248 }
4249
4250 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4251 SystemProperty* p = *plist;
4252 if (p == NULL) {
4253 *plist = new_p;
4254 } else {
4255 while (p->next() != NULL) {
4256 p = p->next();
4257 }
4258 p->set_next(new_p);
4259 }
4260 }
4261
4262 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) {
4263 if (plist == NULL)
4264 return;
4265
4266 SystemProperty* new_p = new SystemProperty(k, v, true);
4267 PropertyList_add(plist, new_p);
4268 }
4269
4270 void Arguments::PropertyList_add(SystemProperty *element) {
4271 PropertyList_add(&_system_properties, element);
4272 }
4273
4274 // This add maintains unique property key in the list.
4275 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) {
4276 if (plist == NULL)
4277 return;
4278
4279 // If property key exist then update with new value.
4280 SystemProperty* prop;
4281 for (prop = *plist; prop != NULL; prop = prop->next()) {
4282 if (strcmp(k, prop->key()) == 0) {
4283 if (append) {
4284 prop->append_value(v);
4285 } else {
4286 prop->set_value(v);
4287 }
4288 return;
4289 }
4290 }
4291
4292 PropertyList_add(plist, k, v);
4293 }
4294
4295 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4296 // Returns true if all of the source pointed by src has been copied over to
4297 // the destination buffer pointed by buf. Otherwise, returns false.
4298 // Notes:
4299 // 1. If the length (buflen) of the destination buffer excluding the
4300 // NULL terminator character is not long enough for holding the expanded
4301 // pid characters, it also returns false instead of returning the partially
4302 // expanded one.
4303 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4304 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4305 char* buf, size_t buflen) {
4306 const char* p = src;
4307 char* b = buf;
4308 const char* src_end = &src[srclen];
4309 char* buf_end = &buf[buflen - 1];
4310
4311 while (p < src_end && b < buf_end) {
4312 if (*p == '%') {
4313 switch (*(++p)) {
4314 case '%': // "%%" ==> "%"
4315 *b++ = *p++;
4316 break;
4317 case 'p': { // "%p" ==> current process id
4318 // buf_end points to the character before the last character so
4319 // that we could write '\0' to the end of the buffer.
4320 size_t buf_sz = buf_end - b + 1;
4321 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4322
4323 // if jio_snprintf fails or the buffer is not long enough to hold
4324 // the expanded pid, returns false.
4325 if (ret < 0 || ret >= (int)buf_sz) {
4326 return false;
4327 } else {
4328 b += ret;
4329 assert(*b == '\0', "fail in copy_expand_pid");
4330 if (p == src_end && b == buf_end + 1) {
4331 // reach the end of the buffer.
4332 return true;
4333 }
4334 }
4335 p++;
4336 break;
4337 }
4338 default :
4339 *b++ = '%';
4340 }
4341 } else {
4342 *b++ = *p++;
4343 }
4344 }
4345 *b = '\0';
4346 return (p == src_end); // return false if not all of the source was copied
4347 }