1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "code/codeCacheExtensions.hpp"
31 #include "compiler/compilerOracle.hpp"
32 #include "gc/shared/cardTableRS.hpp"
33 #include "gc/shared/genCollectedHeap.hpp"
34 #include "gc/shared/referenceProcessor.hpp"
35 #include "gc/shared/taskqueue.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/universe.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "prims/jvmtiExport.hpp"
40 #include "runtime/arguments.hpp"
41 #include "runtime/arguments_ext.hpp"
42 #include "runtime/commandLineFlagConstraintList.hpp"
43 #include "runtime/commandLineFlagRangeList.hpp"
44 #include "runtime/globals.hpp"
45 #include "runtime/globals_extension.hpp"
46 #include "runtime/java.hpp"
47 #include "runtime/os.hpp"
48 #include "runtime/vm_version.hpp"
49 #include "services/management.hpp"
50 #include "services/memTracker.hpp"
51 #include "utilities/defaultStream.hpp"
52 #include "utilities/macros.hpp"
53 #include "utilities/stringUtils.hpp"
54 #if INCLUDE_ALL_GCS
55 #include "gc/cms/compactibleFreeListSpace.hpp"
56 #include "gc/g1/g1CollectedHeap.inline.hpp"
57 #include "gc/parallel/parallelScavengeHeap.hpp"
58 #endif // INCLUDE_ALL_GCS
59
60 // Note: This is a special bug reporting site for the JVM
61 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
62 #define DEFAULT_JAVA_LAUNCHER "generic"
63
64 #define UNSUPPORTED_GC_OPTION(gc) \
65 do { \
66 if (gc) { \
67 if (FLAG_IS_CMDLINE(gc)) { \
68 warning(#gc " is not supported in this VM. Using Serial GC."); \
69 } \
70 FLAG_SET_DEFAULT(gc, false); \
71 } \
72 } while(0)
73
74 char** Arguments::_jvm_flags_array = NULL;
75 int Arguments::_num_jvm_flags = 0;
76 char** Arguments::_jvm_args_array = NULL;
77 int Arguments::_num_jvm_args = 0;
78 char* Arguments::_java_command = NULL;
79 SystemProperty* Arguments::_system_properties = NULL;
80 const char* Arguments::_gc_log_filename = NULL;
81 bool Arguments::_has_profile = false;
82 size_t Arguments::_conservative_max_heap_alignment = 0;
83 size_t Arguments::_min_heap_size = 0;
84 Arguments::Mode Arguments::_mode = _mixed;
85 bool Arguments::_java_compiler = false;
86 bool Arguments::_xdebug_mode = false;
87 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
88 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
89 int Arguments::_sun_java_launcher_pid = -1;
90 bool Arguments::_sun_java_launcher_is_altjvm = false;
91
92 // These parameters are reset in method parse_vm_init_args()
93 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
94 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
95 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
96 bool Arguments::_ClipInlining = ClipInlining;
97 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
98 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
99
100 char* Arguments::SharedArchivePath = NULL;
101
102 AgentLibraryList Arguments::_libraryList;
103 AgentLibraryList Arguments::_agentList;
104
105 abort_hook_t Arguments::_abort_hook = NULL;
106 exit_hook_t Arguments::_exit_hook = NULL;
107 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
108
109
110 SystemProperty *Arguments::_sun_boot_library_path = NULL;
111 SystemProperty *Arguments::_java_library_path = NULL;
112 SystemProperty *Arguments::_java_home = NULL;
113 SystemProperty *Arguments::_java_class_path = NULL;
114 SystemProperty *Arguments::_sun_boot_class_path = NULL;
115
116 char* Arguments::_ext_dirs = NULL;
117
118 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
119 // part of the option string.
120 static bool match_option(const JavaVMOption *option, const char* name,
121 const char** tail) {
122 int len = (int)strlen(name);
123 if (strncmp(option->optionString, name, len) == 0) {
124 *tail = option->optionString + len;
125 return true;
126 } else {
127 return false;
128 }
129 }
130
131 // Check if 'option' matches 'name'. No "tail" is allowed.
132 static bool match_option(const JavaVMOption *option, const char* name) {
133 const char* tail = NULL;
134 bool result = match_option(option, name, &tail);
135 if (tail != NULL && *tail == '\0') {
136 return result;
137 } else {
138 return false;
139 }
140 }
141
142 // Return true if any of the strings in null-terminated array 'names' matches.
143 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
144 // the option must match exactly.
145 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
146 bool tail_allowed) {
147 for (/* empty */; *names != NULL; ++names) {
148 if (match_option(option, *names, tail)) {
149 if (**tail == '\0' || tail_allowed && **tail == ':') {
150 return true;
151 }
152 }
153 }
154 return false;
155 }
156
157 static void logOption(const char* opt) {
158 if (PrintVMOptions) {
159 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
160 }
161 }
162
163 // Process java launcher properties.
164 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
165 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
166 // sun.java.launcher.pid is defined.
167 // Must do this before setting up other system properties,
168 // as some of them may depend on launcher type.
169 for (int index = 0; index < args->nOptions; index++) {
170 const JavaVMOption* option = args->options + index;
171 const char* tail;
172
173 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
174 process_java_launcher_argument(tail, option->extraInfo);
175 continue;
176 }
177 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
178 if (strcmp(tail, "true") == 0) {
179 _sun_java_launcher_is_altjvm = true;
180 }
181 continue;
182 }
183 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
184 _sun_java_launcher_pid = atoi(tail);
185 continue;
186 }
187 }
188 }
189
190 // Initialize system properties key and value.
191 void Arguments::init_system_properties() {
192 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
193 "Java Virtual Machine Specification", false));
194 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
195 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
196 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
197
198 // Following are JVMTI agent writable properties.
199 // Properties values are set to NULL and they are
200 // os specific they are initialized in os::init_system_properties_values().
201 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
202 _java_library_path = new SystemProperty("java.library.path", NULL, true);
203 _java_home = new SystemProperty("java.home", NULL, true);
204 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
205
206 _java_class_path = new SystemProperty("java.class.path", "", true);
207
208 // Add to System Property list.
209 PropertyList_add(&_system_properties, _sun_boot_library_path);
210 PropertyList_add(&_system_properties, _java_library_path);
211 PropertyList_add(&_system_properties, _java_home);
212 PropertyList_add(&_system_properties, _java_class_path);
213 PropertyList_add(&_system_properties, _sun_boot_class_path);
214
215 // Set OS specific system properties values
216 os::init_system_properties_values();
217 }
218
219 // Update/Initialize System properties after JDK version number is known
220 void Arguments::init_version_specific_system_properties() {
221 enum { bufsz = 16 };
222 char buffer[bufsz];
223 const char* spec_vendor = "Sun Microsystems Inc.";
224 uint32_t spec_version = 0;
225
226 spec_vendor = "Oracle Corporation";
227 spec_version = JDK_Version::current().major_version();
228 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
229
230 PropertyList_add(&_system_properties,
231 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.specification.version", buffer, false));
234 PropertyList_add(&_system_properties,
235 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
236 }
237
238 /**
239 * Provide a slightly more user-friendly way of eliminating -XX flags.
240 * When a flag is eliminated, it can be added to this list in order to
241 * continue accepting this flag on the command-line, while issuing a warning
242 * and ignoring the value. Once the JDK version reaches the 'accept_until'
243 * limit, we flatly refuse to admit the existence of the flag. This allows
244 * a flag to die correctly over JDK releases using HSX.
245 * But now that HSX is no longer supported only options with a future
246 * accept_until value need to be listed, and the list can be pruned
247 * on each major release.
248 */
249 typedef struct {
250 const char* name;
251 JDK_Version obsoleted_in; // when the flag went away
252 JDK_Version accept_until; // which version to start denying the existence
253 } ObsoleteFlag;
254
255 static ObsoleteFlag obsolete_jvm_flags[] = {
256 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
257 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
258 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
259 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
260 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
261 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
262 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
263 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
264 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
265 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
266 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
267 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
268 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
269 #ifndef ZERO
270 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
271 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
272 #endif // ZERO
273 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) },
274 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) },
275 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) },
276 { "ThreadSafetyMargin", JDK_Version::jdk(9), JDK_Version::jdk(10) },
277 { "LazyBootClassLoader", JDK_Version::jdk(9), JDK_Version::jdk(10) },
278 { "StarvationMonitorInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
279 { "PreInflateSpin", JDK_Version::jdk(9), JDK_Version::jdk(10) },
280 { NULL, JDK_Version(0), JDK_Version(0) }
281 };
282
283 // Returns true if the flag is obsolete and fits into the range specified
284 // for being ignored. In the case that the flag is ignored, the 'version'
285 // value is filled in with the version number when the flag became
286 // obsolete so that that value can be displayed to the user.
287 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
288 int i = 0;
289 assert(version != NULL, "Must provide a version buffer");
290 while (obsolete_jvm_flags[i].name != NULL) {
291 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
292 // <flag>=xxx form
293 // [-|+]<flag> form
294 size_t len = strlen(flag_status.name);
295 if ((strncmp(flag_status.name, s, len) == 0) &&
296 (strlen(s) == len)){
297 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
298 *version = flag_status.obsoleted_in;
299 return true;
300 }
301 }
302 i++;
303 }
304 return false;
305 }
306
307 // Constructs the system class path (aka boot class path) from the following
308 // components, in order:
309 //
310 // prefix // from -Xbootclasspath/p:...
311 // base // from os::get_system_properties() or -Xbootclasspath=
312 // suffix // from -Xbootclasspath/a:...
313 //
314 // This could be AllStatic, but it isn't needed after argument processing is
315 // complete.
316 class SysClassPath: public StackObj {
317 public:
318 SysClassPath(const char* base);
319 ~SysClassPath();
320
321 inline void set_base(const char* base);
322 inline void add_prefix(const char* prefix);
323 inline void add_suffix_to_prefix(const char* suffix);
324 inline void add_suffix(const char* suffix);
325 inline void reset_path(const char* base);
326
327 inline const char* get_base() const { return _items[_scp_base]; }
328 inline const char* get_prefix() const { return _items[_scp_prefix]; }
329 inline const char* get_suffix() const { return _items[_scp_suffix]; }
330
331 // Combine all the components into a single c-heap-allocated string; caller
332 // must free the string if/when no longer needed.
333 char* combined_path();
334
335 private:
336 // Utility routines.
337 static char* add_to_path(const char* path, const char* str, bool prepend);
338 static char* add_jars_to_path(char* path, const char* directory);
339
340 inline void reset_item_at(int index);
341
342 // Array indices for the items that make up the sysclasspath. All except the
343 // base are allocated in the C heap and freed by this class.
344 enum {
345 _scp_prefix, // from -Xbootclasspath/p:...
346 _scp_base, // the default sysclasspath
347 _scp_suffix, // from -Xbootclasspath/a:...
348 _scp_nitems // the number of items, must be last.
349 };
350
351 const char* _items[_scp_nitems];
352 };
353
354 SysClassPath::SysClassPath(const char* base) {
355 memset(_items, 0, sizeof(_items));
356 _items[_scp_base] = base;
357 }
358
359 SysClassPath::~SysClassPath() {
360 // Free everything except the base.
361 for (int i = 0; i < _scp_nitems; ++i) {
362 if (i != _scp_base) reset_item_at(i);
363 }
364 }
365
366 inline void SysClassPath::set_base(const char* base) {
367 _items[_scp_base] = base;
368 }
369
370 inline void SysClassPath::add_prefix(const char* prefix) {
371 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
372 }
373
374 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
375 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
376 }
377
378 inline void SysClassPath::add_suffix(const char* suffix) {
379 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
380 }
381
382 inline void SysClassPath::reset_item_at(int index) {
383 assert(index < _scp_nitems && index != _scp_base, "just checking");
384 if (_items[index] != NULL) {
385 FREE_C_HEAP_ARRAY(char, _items[index]);
386 _items[index] = NULL;
387 }
388 }
389
390 inline void SysClassPath::reset_path(const char* base) {
391 // Clear the prefix and suffix.
392 reset_item_at(_scp_prefix);
393 reset_item_at(_scp_suffix);
394 set_base(base);
395 }
396
397 //------------------------------------------------------------------------------
398
399
400 // Combine the bootclasspath elements, some of which may be null, into a single
401 // c-heap-allocated string.
402 char* SysClassPath::combined_path() {
403 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
404
405 size_t lengths[_scp_nitems];
406 size_t total_len = 0;
407
408 const char separator = *os::path_separator();
409
410 // Get the lengths.
411 int i;
412 for (i = 0; i < _scp_nitems; ++i) {
413 if (_items[i] != NULL) {
414 lengths[i] = strlen(_items[i]);
415 // Include space for the separator char (or a NULL for the last item).
416 total_len += lengths[i] + 1;
417 }
418 }
419 assert(total_len > 0, "empty sysclasspath not allowed");
420
421 // Copy the _items to a single string.
422 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
423 char* cp_tmp = cp;
424 for (i = 0; i < _scp_nitems; ++i) {
425 if (_items[i] != NULL) {
426 memcpy(cp_tmp, _items[i], lengths[i]);
427 cp_tmp += lengths[i];
428 *cp_tmp++ = separator;
429 }
430 }
431 *--cp_tmp = '\0'; // Replace the extra separator.
432 return cp;
433 }
434
435 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
436 char*
437 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
438 char *cp;
439
440 assert(str != NULL, "just checking");
441 if (path == NULL) {
442 size_t len = strlen(str) + 1;
443 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
444 memcpy(cp, str, len); // copy the trailing null
445 } else {
446 const char separator = *os::path_separator();
447 size_t old_len = strlen(path);
448 size_t str_len = strlen(str);
449 size_t len = old_len + str_len + 2;
450
451 if (prepend) {
452 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
453 char* cp_tmp = cp;
454 memcpy(cp_tmp, str, str_len);
455 cp_tmp += str_len;
456 *cp_tmp = separator;
457 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
458 FREE_C_HEAP_ARRAY(char, path);
459 } else {
460 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
461 char* cp_tmp = cp + old_len;
462 *cp_tmp = separator;
463 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
464 }
465 }
466 return cp;
467 }
468
469 // Scan the directory and append any jar or zip files found to path.
470 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
471 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
472 DIR* dir = os::opendir(directory);
473 if (dir == NULL) return path;
474
475 char dir_sep[2] = { '\0', '\0' };
476 size_t directory_len = strlen(directory);
477 const char fileSep = *os::file_separator();
478 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
479
480 /* Scan the directory for jars/zips, appending them to path. */
481 struct dirent *entry;
482 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
483 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
484 const char* name = entry->d_name;
485 const char* ext = name + strlen(name) - 4;
486 bool isJarOrZip = ext > name &&
487 (os::file_name_strcmp(ext, ".jar") == 0 ||
488 os::file_name_strcmp(ext, ".zip") == 0);
489 if (isJarOrZip) {
490 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
491 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
492 path = add_to_path(path, jarpath, false);
493 FREE_C_HEAP_ARRAY(char, jarpath);
494 }
495 }
496 FREE_C_HEAP_ARRAY(char, dbuf);
497 os::closedir(dir);
498 return path;
499 }
500
501 // Parses a memory size specification string.
502 static bool atomull(const char *s, julong* result) {
503 julong n = 0;
504 int args_read = 0;
505 bool is_hex = false;
506 // Skip leading 0[xX] for hexadecimal
507 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
508 s += 2;
509 is_hex = true;
510 args_read = sscanf(s, JULONG_FORMAT_X, &n);
511 } else {
512 args_read = sscanf(s, JULONG_FORMAT, &n);
513 }
514 if (args_read != 1) {
515 return false;
516 }
517 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
518 s++;
519 }
520 // 4705540: illegal if more characters are found after the first non-digit
521 if (strlen(s) > 1) {
522 return false;
523 }
524 switch (*s) {
525 case 'T': case 't':
526 *result = n * G * K;
527 // Check for overflow.
528 if (*result/((julong)G * K) != n) return false;
529 return true;
530 case 'G': case 'g':
531 *result = n * G;
532 if (*result/G != n) return false;
533 return true;
534 case 'M': case 'm':
535 *result = n * M;
536 if (*result/M != n) return false;
537 return true;
538 case 'K': case 'k':
539 *result = n * K;
540 if (*result/K != n) return false;
541 return true;
542 case '\0':
543 *result = n;
544 return true;
545 default:
546 return false;
547 }
548 }
549
550 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
551 if (size < min_size) return arg_too_small;
552 // Check that size will fit in a size_t (only relevant on 32-bit)
553 if (size > max_uintx) return arg_too_big;
554 return arg_in_range;
555 }
556
557 // Describe an argument out of range error
558 void Arguments::describe_range_error(ArgsRange errcode) {
559 switch(errcode) {
560 case arg_too_big:
561 jio_fprintf(defaultStream::error_stream(),
562 "The specified size exceeds the maximum "
563 "representable size.\n");
564 break;
565 case arg_too_small:
566 case arg_unreadable:
567 case arg_in_range:
568 // do nothing for now
569 break;
570 default:
571 ShouldNotReachHere();
572 }
573 }
574
575 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
576 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
577 return true;
578 } else {
579 return false;
580 }
581 }
582
583 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
584 double v;
585 if (sscanf(value, "%lf", &v) != 1) {
586 return false;
587 }
588
589 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
590 return true;
591 }
592 return false;
593 }
594
595 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
596 julong v;
597 int int_v;
598 intx intx_v;
599 bool is_neg = false;
600 // Check the sign first since atomull() parses only unsigned values.
601 if (*value == '-') {
602 if ((CommandLineFlags::intxAt(name, &intx_v) != Flag::SUCCESS) && (CommandLineFlags::intAt(name, &int_v) != Flag::SUCCESS)) {
603 return false;
604 }
605 value++;
606 is_neg = true;
607 }
608 if (!atomull(value, &v)) {
609 return false;
610 }
611 int_v = (int) v;
612 if (is_neg) {
613 int_v = -int_v;
614 }
615 if (CommandLineFlags::intAtPut(name, &int_v, origin) == Flag::SUCCESS) {
616 return true;
617 }
618 uint uint_v = (uint) v;
619 if (!is_neg && CommandLineFlags::uintAtPut(name, &uint_v, origin) == Flag::SUCCESS) {
620 return true;
621 }
622 intx_v = (intx) v;
623 if (is_neg) {
624 intx_v = -intx_v;
625 }
626 if (CommandLineFlags::intxAtPut(name, &intx_v, origin) == Flag::SUCCESS) {
627 return true;
628 }
629 uintx uintx_v = (uintx) v;
630 if (!is_neg && (CommandLineFlags::uintxAtPut(name, &uintx_v, origin) == Flag::SUCCESS)) {
631 return true;
632 }
633 uint64_t uint64_t_v = (uint64_t) v;
634 if (!is_neg && (CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin) == Flag::SUCCESS)) {
635 return true;
636 }
637 size_t size_t_v = (size_t) v;
638 if (!is_neg && (CommandLineFlags::size_tAtPut(name, &size_t_v, origin) == Flag::SUCCESS)) {
639 return true;
640 }
641 return false;
642 }
643
644 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
645 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
646 // Contract: CommandLineFlags always returns a pointer that needs freeing.
647 FREE_C_HEAP_ARRAY(char, value);
648 return true;
649 }
650
651 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
652 const char* old_value = "";
653 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
654 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
655 size_t new_len = strlen(new_value);
656 const char* value;
657 char* free_this_too = NULL;
658 if (old_len == 0) {
659 value = new_value;
660 } else if (new_len == 0) {
661 value = old_value;
662 } else {
663 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
664 // each new setting adds another LINE to the switch:
665 sprintf(buf, "%s\n%s", old_value, new_value);
666 value = buf;
667 free_this_too = buf;
668 }
669 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
670 // CommandLineFlags always returns a pointer that needs freeing.
671 FREE_C_HEAP_ARRAY(char, value);
672 if (free_this_too != NULL) {
673 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
674 FREE_C_HEAP_ARRAY(char, free_this_too);
675 }
676 return true;
677 }
678
679 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
680
681 // range of acceptable characters spelled out for portability reasons
682 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
683 #define BUFLEN 255
684 char name[BUFLEN+1];
685 char dummy;
686
687 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
688 return set_bool_flag(name, false, origin);
689 }
690 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
691 return set_bool_flag(name, true, origin);
692 }
693
694 char punct;
695 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
696 const char* value = strchr(arg, '=') + 1;
697 Flag* flag = Flag::find_flag(name, strlen(name));
698 if (flag != NULL && flag->is_ccstr()) {
699 if (flag->ccstr_accumulates()) {
700 return append_to_string_flag(name, value, origin);
701 } else {
702 if (value[0] == '\0') {
703 value = NULL;
704 }
705 return set_string_flag(name, value, origin);
706 }
707 }
708 }
709
710 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
711 const char* value = strchr(arg, '=') + 1;
712 // -XX:Foo:=xxx will reset the string flag to the given value.
713 if (value[0] == '\0') {
714 value = NULL;
715 }
716 return set_string_flag(name, value, origin);
717 }
718
719 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
720 #define SIGNED_NUMBER_RANGE "[-0123456789]"
721 #define NUMBER_RANGE "[0123456789]"
722 char value[BUFLEN + 1];
723 char value2[BUFLEN + 1];
724 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
725 // Looks like a floating-point number -- try again with more lenient format string
726 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
727 return set_fp_numeric_flag(name, value, origin);
728 }
729 }
730
731 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
732 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
733 return set_numeric_flag(name, value, origin);
734 }
735
736 return false;
737 }
738
739 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
740 assert(bldarray != NULL, "illegal argument");
741
742 if (arg == NULL) {
743 return;
744 }
745
746 int new_count = *count + 1;
747
748 // expand the array and add arg to the last element
749 if (*bldarray == NULL) {
750 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
751 } else {
752 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
753 }
754 (*bldarray)[*count] = os::strdup_check_oom(arg);
755 *count = new_count;
756 }
757
758 void Arguments::build_jvm_args(const char* arg) {
759 add_string(&_jvm_args_array, &_num_jvm_args, arg);
760 }
761
762 void Arguments::build_jvm_flags(const char* arg) {
763 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
764 }
765
766 // utility function to return a string that concatenates all
767 // strings in a given char** array
768 const char* Arguments::build_resource_string(char** args, int count) {
769 if (args == NULL || count == 0) {
770 return NULL;
771 }
772 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
773 for (int i = 1; i < count; i++) {
774 length += strlen(args[i]) + 1; // add 1 for a space
775 }
776 char* s = NEW_RESOURCE_ARRAY(char, length);
777 strcpy(s, args[0]);
778 for (int j = 1; j < count; j++) {
779 strcat(s, " ");
780 strcat(s, args[j]);
781 }
782 return (const char*) s;
783 }
784
785 void Arguments::print_on(outputStream* st) {
786 st->print_cr("VM Arguments:");
787 if (num_jvm_flags() > 0) {
788 st->print("jvm_flags: "); print_jvm_flags_on(st);
789 st->cr();
790 }
791 if (num_jvm_args() > 0) {
792 st->print("jvm_args: "); print_jvm_args_on(st);
793 st->cr();
794 }
795 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
796 if (_java_class_path != NULL) {
797 char* path = _java_class_path->value();
798 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
799 }
800 st->print_cr("Launcher Type: %s", _sun_java_launcher);
801 }
802
803 void Arguments::print_summary_on(outputStream* st) {
804 // Print the command line. Environment variables that are helpful for
805 // reproducing the problem are written later in the hs_err file.
806 // flags are from setting file
807 if (num_jvm_flags() > 0) {
808 st->print_raw("Settings File: ");
809 print_jvm_flags_on(st);
810 st->cr();
811 }
812 // args are the command line and environment variable arguments.
813 st->print_raw("Command Line: ");
814 if (num_jvm_args() > 0) {
815 print_jvm_args_on(st);
816 }
817 // this is the classfile and any arguments to the java program
818 if (java_command() != NULL) {
819 st->print("%s", java_command());
820 }
821 st->cr();
822 }
823
824 void Arguments::print_jvm_flags_on(outputStream* st) {
825 if (_num_jvm_flags > 0) {
826 for (int i=0; i < _num_jvm_flags; i++) {
827 st->print("%s ", _jvm_flags_array[i]);
828 }
829 }
830 }
831
832 void Arguments::print_jvm_args_on(outputStream* st) {
833 if (_num_jvm_args > 0) {
834 for (int i=0; i < _num_jvm_args; i++) {
835 st->print("%s ", _jvm_args_array[i]);
836 }
837 }
838 }
839
840 bool Arguments::process_argument(const char* arg,
841 jboolean ignore_unrecognized, Flag::Flags origin) {
842
843 JDK_Version since = JDK_Version();
844
845 if (parse_argument(arg, origin) || ignore_unrecognized) {
846 return true;
847 }
848
849 // Determine if the flag has '+', '-', or '=' characters.
850 bool has_plus_minus = (*arg == '+' || *arg == '-');
851 const char* const argname = has_plus_minus ? arg + 1 : arg;
852
853 size_t arg_len;
854 const char* equal_sign = strchr(argname, '=');
855 if (equal_sign == NULL) {
856 arg_len = strlen(argname);
857 } else {
858 arg_len = equal_sign - argname;
859 }
860
861 // Only make the obsolete check for valid arguments.
862 if (arg_len <= BUFLEN) {
863 // Construct a string which consists only of the argument name without '+', '-', or '='.
864 char stripped_argname[BUFLEN+1];
865 strncpy(stripped_argname, argname, arg_len);
866 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
867
868 if (is_newly_obsolete(stripped_argname, &since)) {
869 char version[256];
870 since.to_string(version, sizeof(version));
871 warning("ignoring option %s; support was removed in %s", stripped_argname, version);
872 return true;
873 }
874 }
875
876 // For locked flags, report a custom error message if available.
877 // Otherwise, report the standard unrecognized VM option.
878 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
879 if (found_flag != NULL) {
880 char locked_message_buf[BUFLEN];
881 found_flag->get_locked_message(locked_message_buf, BUFLEN);
882 if (strlen(locked_message_buf) == 0) {
883 if (found_flag->is_bool() && !has_plus_minus) {
884 jio_fprintf(defaultStream::error_stream(),
885 "Missing +/- setting for VM option '%s'\n", argname);
886 } else if (!found_flag->is_bool() && has_plus_minus) {
887 jio_fprintf(defaultStream::error_stream(),
888 "Unexpected +/- setting in VM option '%s'\n", argname);
889 } else {
890 jio_fprintf(defaultStream::error_stream(),
891 "Improperly specified VM option '%s'\n", argname);
892 }
893 } else {
894 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
895 }
896 } else {
897 jio_fprintf(defaultStream::error_stream(),
898 "Unrecognized VM option '%s'\n", argname);
899 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
900 if (fuzzy_matched != NULL) {
901 jio_fprintf(defaultStream::error_stream(),
902 "Did you mean '%s%s%s'? ",
903 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
904 fuzzy_matched->_name,
905 (fuzzy_matched->is_bool()) ? "" : "=<value>");
906 }
907 }
908
909 // allow for commandline "commenting out" options like -XX:#+Verbose
910 return arg[0] == '#';
911 }
912
913 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
914 FILE* stream = fopen(file_name, "rb");
915 if (stream == NULL) {
916 if (should_exist) {
917 jio_fprintf(defaultStream::error_stream(),
918 "Could not open settings file %s\n", file_name);
919 return false;
920 } else {
921 return true;
922 }
923 }
924
925 char token[1024];
926 int pos = 0;
927
928 bool in_white_space = true;
929 bool in_comment = false;
930 bool in_quote = false;
931 char quote_c = 0;
932 bool result = true;
933
934 int c = getc(stream);
935 while(c != EOF && pos < (int)(sizeof(token)-1)) {
936 if (in_white_space) {
937 if (in_comment) {
938 if (c == '\n') in_comment = false;
939 } else {
940 if (c == '#') in_comment = true;
941 else if (!isspace(c)) {
942 in_white_space = false;
943 token[pos++] = c;
944 }
945 }
946 } else {
947 if (c == '\n' || (!in_quote && isspace(c))) {
948 // token ends at newline, or at unquoted whitespace
949 // this allows a way to include spaces in string-valued options
950 token[pos] = '\0';
951 logOption(token);
952 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
953 build_jvm_flags(token);
954 pos = 0;
955 in_white_space = true;
956 in_quote = false;
957 } else if (!in_quote && (c == '\'' || c == '"')) {
958 in_quote = true;
959 quote_c = c;
960 } else if (in_quote && (c == quote_c)) {
961 in_quote = false;
962 } else {
963 token[pos++] = c;
964 }
965 }
966 c = getc(stream);
967 }
968 if (pos > 0) {
969 token[pos] = '\0';
970 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
971 build_jvm_flags(token);
972 }
973 fclose(stream);
974 return result;
975 }
976
977 //=============================================================================================================
978 // Parsing of properties (-D)
979
980 const char* Arguments::get_property(const char* key) {
981 return PropertyList_get_value(system_properties(), key);
982 }
983
984 bool Arguments::add_property(const char* prop) {
985 const char* eq = strchr(prop, '=');
986 char* key;
987 // ns must be static--its address may be stored in a SystemProperty object.
988 const static char ns[1] = {0};
989 char* value = (char *)ns;
990
991 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
992 key = AllocateHeap(key_len + 1, mtInternal);
993 strncpy(key, prop, key_len);
994 key[key_len] = '\0';
995
996 if (eq != NULL) {
997 size_t value_len = strlen(prop) - key_len - 1;
998 value = AllocateHeap(value_len + 1, mtInternal);
999 strncpy(value, &prop[key_len + 1], value_len + 1);
1000 }
1001
1002 if (strcmp(key, "java.compiler") == 0) {
1003 process_java_compiler_argument(value);
1004 FreeHeap(key);
1005 if (eq != NULL) {
1006 FreeHeap(value);
1007 }
1008 return true;
1009 } else if (strcmp(key, "sun.java.command") == 0) {
1010 _java_command = value;
1011
1012 // Record value in Arguments, but let it get passed to Java.
1013 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1014 strcmp(key, "sun.java.launcher.pid") == 0) {
1015 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1016 // private and are processed in process_sun_java_launcher_properties();
1017 // the sun.java.launcher property is passed on to the java application
1018 FreeHeap(key);
1019 if (eq != NULL) {
1020 FreeHeap(value);
1021 }
1022 return true;
1023 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1024 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1025 // its value without going through the property list or making a Java call.
1026 _java_vendor_url_bug = value;
1027 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1028 PropertyList_unique_add(&_system_properties, key, value, true);
1029 return true;
1030 }
1031 // Create new property and add at the end of the list
1032 PropertyList_unique_add(&_system_properties, key, value);
1033 return true;
1034 }
1035
1036 //===========================================================================================================
1037 // Setting int/mixed/comp mode flags
1038
1039 void Arguments::set_mode_flags(Mode mode) {
1040 // Set up default values for all flags.
1041 // If you add a flag to any of the branches below,
1042 // add a default value for it here.
1043 set_java_compiler(false);
1044 _mode = mode;
1045
1046 // Ensure Agent_OnLoad has the correct initial values.
1047 // This may not be the final mode; mode may change later in onload phase.
1048 PropertyList_unique_add(&_system_properties, "java.vm.info",
1049 (char*)VM_Version::vm_info_string(), false);
1050
1051 UseInterpreter = true;
1052 UseCompiler = true;
1053 UseLoopCounter = true;
1054
1055 // Default values may be platform/compiler dependent -
1056 // use the saved values
1057 ClipInlining = Arguments::_ClipInlining;
1058 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1059 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1060 BackgroundCompilation = Arguments::_BackgroundCompilation;
1061 if (TieredCompilation) {
1062 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1063 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1064 }
1065 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1066 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1067 }
1068 }
1069
1070 // Change from defaults based on mode
1071 switch (mode) {
1072 default:
1073 ShouldNotReachHere();
1074 break;
1075 case _int:
1076 UseCompiler = false;
1077 UseLoopCounter = false;
1078 AlwaysCompileLoopMethods = false;
1079 UseOnStackReplacement = false;
1080 break;
1081 case _mixed:
1082 // same as default
1083 break;
1084 case _comp:
1085 UseInterpreter = false;
1086 BackgroundCompilation = false;
1087 ClipInlining = false;
1088 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1089 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1090 // compile a level 4 (C2) and then continue executing it.
1091 if (TieredCompilation) {
1092 Tier3InvokeNotifyFreqLog = 0;
1093 Tier4InvocationThreshold = 0;
1094 }
1095 break;
1096 }
1097 }
1098
1099 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1100 // Conflict: required to use shared spaces (-Xshare:on), but
1101 // incompatible command line options were chosen.
1102
1103 static void no_shared_spaces(const char* message) {
1104 if (RequireSharedSpaces) {
1105 jio_fprintf(defaultStream::error_stream(),
1106 "Class data sharing is inconsistent with other specified options.\n");
1107 vm_exit_during_initialization("Unable to use shared archive.", message);
1108 } else {
1109 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1110 }
1111 }
1112 #endif
1113
1114 // Returns threshold scaled with the value of scale.
1115 // If scale < 0.0, threshold is returned without scaling.
1116 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1117 if (scale == 1.0 || scale < 0.0) {
1118 return threshold;
1119 } else {
1120 return (intx)(threshold * scale);
1121 }
1122 }
1123
1124 // Returns freq_log scaled with the value of scale.
1125 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1126 // If scale < 0.0, freq_log is returned without scaling.
1127 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1128 // Check if scaling is necessary or if negative value was specified.
1129 if (scale == 1.0 || scale < 0.0) {
1130 return freq_log;
1131 }
1132 // Check values to avoid calculating log2 of 0.
1133 if (scale == 0.0 || freq_log == 0) {
1134 return 0;
1135 }
1136 // Determine the maximum notification frequency value currently supported.
1137 // The largest mask value that the interpreter/C1 can handle is
1138 // of length InvocationCounter::number_of_count_bits. Mask values are always
1139 // one bit shorter then the value of the notification frequency. Set
1140 // max_freq_bits accordingly.
1141 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1142 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1143 if (scaled_freq == 0) {
1144 // Return 0 right away to avoid calculating log2 of 0.
1145 return 0;
1146 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1147 return max_freq_bits;
1148 } else {
1149 return log2_intptr(scaled_freq);
1150 }
1151 }
1152
1153 void Arguments::set_tiered_flags() {
1154 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1155 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1156 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1157 }
1158 if (CompilationPolicyChoice < 2) {
1159 vm_exit_during_initialization(
1160 "Incompatible compilation policy selected", NULL);
1161 }
1162 // Increase the code cache size - tiered compiles a lot more.
1163 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1164 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1165 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1166 }
1167 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1168 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1169 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1170
1171 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1172 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1173 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1174 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1175 }
1176 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1177 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1178 }
1179 // Check consistency of code heap sizes
1180 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1181 jio_fprintf(defaultStream::error_stream(),
1182 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1183 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1184 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1185 vm_exit(1);
1186 }
1187 }
1188 }
1189 if (!UseInterpreter) { // -Xcomp
1190 Tier3InvokeNotifyFreqLog = 0;
1191 Tier4InvocationThreshold = 0;
1192 }
1193
1194 if (CompileThresholdScaling < 0) {
1195 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1196 }
1197
1198 // Scale tiered compilation thresholds.
1199 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1200 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1201 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1202 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1203
1204 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1205 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1206 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1207 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1208
1209 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1210 // once these thresholds become supported.
1211
1212 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1213 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1214
1215 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1216 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1217
1218 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1219
1220 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1221 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1222 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1223 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1224 }
1225 }
1226
1227 #if INCLUDE_ALL_GCS
1228 static void disable_adaptive_size_policy(const char* collector_name) {
1229 if (UseAdaptiveSizePolicy) {
1230 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1231 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1232 collector_name);
1233 }
1234 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1235 }
1236 }
1237
1238 void Arguments::set_parnew_gc_flags() {
1239 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1240 "control point invariant");
1241 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1242 assert(UseParNewGC, "ParNew should always be used with CMS");
1243
1244 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1245 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1246 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1247 } else if (ParallelGCThreads == 0) {
1248 jio_fprintf(defaultStream::error_stream(),
1249 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1250 vm_exit(1);
1251 }
1252
1253 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1254 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1255 // we set them to 1024 and 1024.
1256 // See CR 6362902.
1257 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1258 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1259 }
1260 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1261 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1262 }
1263
1264 // When using compressed oops, we use local overflow stacks,
1265 // rather than using a global overflow list chained through
1266 // the klass word of the object's pre-image.
1267 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1268 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1269 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1270 }
1271 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1272 }
1273 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1274 }
1275
1276 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1277 // sparc/solaris for certain applications, but would gain from
1278 // further optimization and tuning efforts, and would almost
1279 // certainly gain from analysis of platform and environment.
1280 void Arguments::set_cms_and_parnew_gc_flags() {
1281 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1282 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1283 assert(UseParNewGC, "ParNew should always be used with CMS");
1284
1285 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1286 disable_adaptive_size_policy("UseConcMarkSweepGC");
1287
1288 set_parnew_gc_flags();
1289
1290 size_t max_heap = align_size_down(MaxHeapSize,
1291 CardTableRS::ct_max_alignment_constraint());
1292
1293 // Now make adjustments for CMS
1294 intx tenuring_default = (intx)6;
1295 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1296
1297 // Preferred young gen size for "short" pauses:
1298 // upper bound depends on # of threads and NewRatio.
1299 const size_t preferred_max_new_size_unaligned =
1300 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1301 size_t preferred_max_new_size =
1302 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1303
1304 // Unless explicitly requested otherwise, size young gen
1305 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1306
1307 // If either MaxNewSize or NewRatio is set on the command line,
1308 // assume the user is trying to set the size of the young gen.
1309 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1310
1311 // Set MaxNewSize to our calculated preferred_max_new_size unless
1312 // NewSize was set on the command line and it is larger than
1313 // preferred_max_new_size.
1314 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1315 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1316 } else {
1317 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1318 }
1319 if (PrintGCDetails && Verbose) {
1320 // Too early to use gclog_or_tty
1321 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1322 }
1323
1324 // Code along this path potentially sets NewSize and OldSize
1325 if (PrintGCDetails && Verbose) {
1326 // Too early to use gclog_or_tty
1327 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1328 " initial_heap_size: " SIZE_FORMAT
1329 " max_heap: " SIZE_FORMAT,
1330 min_heap_size(), InitialHeapSize, max_heap);
1331 }
1332 size_t min_new = preferred_max_new_size;
1333 if (FLAG_IS_CMDLINE(NewSize)) {
1334 min_new = NewSize;
1335 }
1336 if (max_heap > min_new && min_heap_size() > min_new) {
1337 // Unless explicitly requested otherwise, make young gen
1338 // at least min_new, and at most preferred_max_new_size.
1339 if (FLAG_IS_DEFAULT(NewSize)) {
1340 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1341 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1342 if (PrintGCDetails && Verbose) {
1343 // Too early to use gclog_or_tty
1344 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1345 }
1346 }
1347 // Unless explicitly requested otherwise, size old gen
1348 // so it's NewRatio x of NewSize.
1349 if (FLAG_IS_DEFAULT(OldSize)) {
1350 if (max_heap > NewSize) {
1351 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1352 if (PrintGCDetails && Verbose) {
1353 // Too early to use gclog_or_tty
1354 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1355 }
1356 }
1357 }
1358 }
1359 }
1360 // Unless explicitly requested otherwise, definitely
1361 // promote all objects surviving "tenuring_default" scavenges.
1362 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1363 FLAG_IS_DEFAULT(SurvivorRatio)) {
1364 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1365 }
1366 // If we decided above (or user explicitly requested)
1367 // `promote all' (via MaxTenuringThreshold := 0),
1368 // prefer minuscule survivor spaces so as not to waste
1369 // space for (non-existent) survivors
1370 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1371 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1372 }
1373
1374 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1375 // but rather the number of free blocks of a given size that are used when
1376 // replenishing the local per-worker free list caches.
1377 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1378 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1379 // OldPLAB sizing manually turned off: Use a larger default setting,
1380 // unless it was manually specified. This is because a too-low value
1381 // will slow down scavenges.
1382 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1383 } else {
1384 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1385 }
1386 }
1387
1388 // If either of the static initialization defaults have changed, note this
1389 // modification.
1390 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1391 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1392 }
1393
1394 if (!ClassUnloading) {
1395 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1396 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1397 }
1398
1399 if (PrintGCDetails && Verbose) {
1400 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1401 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1402 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1403 }
1404 }
1405 #endif // INCLUDE_ALL_GCS
1406
1407 void set_object_alignment() {
1408 // Object alignment.
1409 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1410 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1411 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1412 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1413 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1414 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1415
1416 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1417 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1418
1419 // Oop encoding heap max
1420 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1421
1422 if (SurvivorAlignmentInBytes == 0) {
1423 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1424 }
1425
1426 #if INCLUDE_ALL_GCS
1427 // Set CMS global values
1428 CompactibleFreeListSpace::set_cms_values();
1429 #endif // INCLUDE_ALL_GCS
1430 }
1431
1432 size_t Arguments::max_heap_for_compressed_oops() {
1433 // Avoid sign flip.
1434 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1435 // We need to fit both the NULL page and the heap into the memory budget, while
1436 // keeping alignment constraints of the heap. To guarantee the latter, as the
1437 // NULL page is located before the heap, we pad the NULL page to the conservative
1438 // maximum alignment that the GC may ever impose upon the heap.
1439 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1440 _conservative_max_heap_alignment);
1441
1442 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1443 NOT_LP64(ShouldNotReachHere(); return 0);
1444 }
1445
1446 bool Arguments::should_auto_select_low_pause_collector() {
1447 if (UseAutoGCSelectPolicy &&
1448 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1449 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1450 if (PrintGCDetails) {
1451 // Cannot use gclog_or_tty yet.
1452 tty->print_cr("Automatic selection of the low pause collector"
1453 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1454 }
1455 return true;
1456 }
1457 return false;
1458 }
1459
1460 void Arguments::set_use_compressed_oops() {
1461 #ifndef ZERO
1462 #ifdef _LP64
1463 // MaxHeapSize is not set up properly at this point, but
1464 // the only value that can override MaxHeapSize if we are
1465 // to use UseCompressedOops is InitialHeapSize.
1466 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1467
1468 if (max_heap_size <= max_heap_for_compressed_oops()) {
1469 #if !defined(COMPILER1) || defined(TIERED)
1470 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1471 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1472 }
1473 #endif
1474 } else {
1475 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1476 warning("Max heap size too large for Compressed Oops");
1477 FLAG_SET_DEFAULT(UseCompressedOops, false);
1478 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1479 }
1480 }
1481 #endif // _LP64
1482 #endif // ZERO
1483 }
1484
1485
1486 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1487 // set_use_compressed_oops().
1488 void Arguments::set_use_compressed_klass_ptrs() {
1489 #ifndef ZERO
1490 #ifdef _LP64
1491 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1492 if (!UseCompressedOops) {
1493 if (UseCompressedClassPointers) {
1494 warning("UseCompressedClassPointers requires UseCompressedOops");
1495 }
1496 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1497 } else {
1498 // Turn on UseCompressedClassPointers too
1499 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1500 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1501 }
1502 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1503 if (UseCompressedClassPointers) {
1504 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1505 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1506 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1507 }
1508 }
1509 }
1510 #endif // _LP64
1511 #endif // !ZERO
1512 }
1513
1514 void Arguments::set_conservative_max_heap_alignment() {
1515 // The conservative maximum required alignment for the heap is the maximum of
1516 // the alignments imposed by several sources: any requirements from the heap
1517 // itself, the collector policy and the maximum page size we may run the VM
1518 // with.
1519 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1520 #if INCLUDE_ALL_GCS
1521 if (UseParallelGC) {
1522 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1523 } else if (UseG1GC) {
1524 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1525 }
1526 #endif // INCLUDE_ALL_GCS
1527 _conservative_max_heap_alignment = MAX4(heap_alignment,
1528 (size_t)os::vm_allocation_granularity(),
1529 os::max_page_size(),
1530 CollectorPolicy::compute_heap_alignment());
1531 }
1532
1533 void Arguments::select_gc_ergonomically() {
1534 if (os::is_server_class_machine()) {
1535 if (should_auto_select_low_pause_collector()) {
1536 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1537 } else {
1538 #if defined(JAVASE_EMBEDDED)
1539 FLAG_SET_ERGO(bool, UseParallelGC, true);
1540 #else
1541 FLAG_SET_ERGO(bool, UseG1GC, true);
1542 #endif
1543 }
1544 } else {
1545 FLAG_SET_ERGO(bool, UseSerialGC, true);
1546 }
1547 }
1548
1549 void Arguments::select_gc() {
1550 if (!gc_selected()) {
1551 select_gc_ergonomically();
1552 guarantee(gc_selected(), "No GC selected");
1553 }
1554 }
1555
1556 void Arguments::set_ergonomics_flags() {
1557 select_gc();
1558
1559 #ifdef COMPILER2
1560 // Shared spaces work fine with other GCs but causes bytecode rewriting
1561 // to be disabled, which hurts interpreter performance and decreases
1562 // server performance. When -server is specified, keep the default off
1563 // unless it is asked for. Future work: either add bytecode rewriting
1564 // at link time, or rewrite bytecodes in non-shared methods.
1565 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1566 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1567 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1568 }
1569 #endif
1570
1571 set_conservative_max_heap_alignment();
1572
1573 #ifndef ZERO
1574 #ifdef _LP64
1575 set_use_compressed_oops();
1576
1577 // set_use_compressed_klass_ptrs() must be called after calling
1578 // set_use_compressed_oops().
1579 set_use_compressed_klass_ptrs();
1580
1581 // Also checks that certain machines are slower with compressed oops
1582 // in vm_version initialization code.
1583 #endif // _LP64
1584 #endif // !ZERO
1585
1586 // Set up runtime image flags.
1587 set_runtime_image_flags();
1588
1589 CodeCacheExtensions::set_ergonomics_flags();
1590 }
1591
1592 void Arguments::set_parallel_gc_flags() {
1593 assert(UseParallelGC || UseParallelOldGC, "Error");
1594 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1595 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1596 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1597 }
1598 FLAG_SET_DEFAULT(UseParallelGC, true);
1599
1600 // If no heap maximum was requested explicitly, use some reasonable fraction
1601 // of the physical memory, up to a maximum of 1GB.
1602 FLAG_SET_DEFAULT(ParallelGCThreads,
1603 Abstract_VM_Version::parallel_worker_threads());
1604 if (ParallelGCThreads == 0) {
1605 jio_fprintf(defaultStream::error_stream(),
1606 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1607 vm_exit(1);
1608 }
1609
1610 if (UseAdaptiveSizePolicy) {
1611 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1612 // unless the user actually sets these flags.
1613 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1614 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1615 }
1616 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1617 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1618 }
1619 }
1620
1621 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1622 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1623 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1624 // See CR 6362902 for details.
1625 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1626 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1627 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1628 }
1629 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1630 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1631 }
1632 }
1633
1634 if (UseParallelOldGC) {
1635 // Par compact uses lower default values since they are treated as
1636 // minimums. These are different defaults because of the different
1637 // interpretation and are not ergonomically set.
1638 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1639 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1640 }
1641 }
1642 }
1643
1644 void Arguments::set_g1_gc_flags() {
1645 assert(UseG1GC, "Error");
1646 #ifdef COMPILER1
1647 FastTLABRefill = false;
1648 #endif
1649 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1650 if (ParallelGCThreads == 0) {
1651 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1652 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1653 }
1654
1655 #if INCLUDE_ALL_GCS
1656 if (G1ConcRefinementThreads == 0) {
1657 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1658 }
1659 #endif
1660
1661 // MarkStackSize will be set (if it hasn't been set by the user)
1662 // when concurrent marking is initialized.
1663 // Its value will be based upon the number of parallel marking threads.
1664 // But we do set the maximum mark stack size here.
1665 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1666 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1667 }
1668
1669 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1670 // In G1, we want the default GC overhead goal to be higher than
1671 // say in PS. So we set it here to 10%. Otherwise the heap might
1672 // be expanded more aggressively than we would like it to. In
1673 // fact, even 10% seems to not be high enough in some cases
1674 // (especially small GC stress tests that the main thing they do
1675 // is allocation). We might consider increase it further.
1676 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1677 }
1678
1679 if (PrintGCDetails && Verbose) {
1680 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1681 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1682 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1683 }
1684 }
1685
1686 #if !INCLUDE_ALL_GCS
1687 #ifdef ASSERT
1688 static bool verify_serial_gc_flags() {
1689 return (UseSerialGC &&
1690 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1691 UseParallelGC || UseParallelOldGC));
1692 }
1693 #endif // ASSERT
1694 #endif // INCLUDE_ALL_GCS
1695
1696 void Arguments::set_gc_specific_flags() {
1697 #if INCLUDE_ALL_GCS
1698 // Set per-collector flags
1699 if (UseParallelGC || UseParallelOldGC) {
1700 set_parallel_gc_flags();
1701 } else if (UseConcMarkSweepGC) {
1702 set_cms_and_parnew_gc_flags();
1703 } else if (UseG1GC) {
1704 set_g1_gc_flags();
1705 }
1706 check_deprecated_gc_flags();
1707 if (AssumeMP && !UseSerialGC) {
1708 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1709 warning("If the number of processors is expected to increase from one, then"
1710 " you should configure the number of parallel GC threads appropriately"
1711 " using -XX:ParallelGCThreads=N");
1712 }
1713 }
1714 if (MinHeapFreeRatio == 100) {
1715 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1716 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1717 }
1718 #else // INCLUDE_ALL_GCS
1719 assert(verify_serial_gc_flags(), "SerialGC unset");
1720 #endif // INCLUDE_ALL_GCS
1721 }
1722
1723 julong Arguments::limit_by_allocatable_memory(julong limit) {
1724 julong max_allocatable;
1725 julong result = limit;
1726 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1727 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1728 }
1729 return result;
1730 }
1731
1732 // Use static initialization to get the default before parsing
1733 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1734
1735 void Arguments::set_heap_size() {
1736 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1737 // Deprecated flag
1738 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1739 }
1740
1741 const julong phys_mem =
1742 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1743 : (julong)MaxRAM;
1744
1745 // If the maximum heap size has not been set with -Xmx,
1746 // then set it as fraction of the size of physical memory,
1747 // respecting the maximum and minimum sizes of the heap.
1748 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1749 julong reasonable_max = phys_mem / MaxRAMFraction;
1750
1751 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1752 // Small physical memory, so use a minimum fraction of it for the heap
1753 reasonable_max = phys_mem / MinRAMFraction;
1754 } else {
1755 // Not-small physical memory, so require a heap at least
1756 // as large as MaxHeapSize
1757 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1758 }
1759 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1760 // Limit the heap size to ErgoHeapSizeLimit
1761 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1762 }
1763 if (UseCompressedOops) {
1764 // Limit the heap size to the maximum possible when using compressed oops
1765 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1766
1767 // HeapBaseMinAddress can be greater than default but not less than.
1768 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1769 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1770 // matches compressed oops printing flags
1771 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1772 jio_fprintf(defaultStream::error_stream(),
1773 "HeapBaseMinAddress must be at least " SIZE_FORMAT
1774 " (" SIZE_FORMAT "G) which is greater than value given "
1775 SIZE_FORMAT "\n",
1776 DefaultHeapBaseMinAddress,
1777 DefaultHeapBaseMinAddress/G,
1778 HeapBaseMinAddress);
1779 }
1780 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1781 }
1782 }
1783
1784 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1785 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1786 // but it should be not less than default MaxHeapSize.
1787 max_coop_heap -= HeapBaseMinAddress;
1788 }
1789 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1790 }
1791 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1792
1793 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1794 // An initial heap size was specified on the command line,
1795 // so be sure that the maximum size is consistent. Done
1796 // after call to limit_by_allocatable_memory because that
1797 // method might reduce the allocation size.
1798 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1799 }
1800
1801 if (PrintGCDetails && Verbose) {
1802 // Cannot use gclog_or_tty yet.
1803 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1804 }
1805 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1806 }
1807
1808 // If the minimum or initial heap_size have not been set or requested to be set
1809 // ergonomically, set them accordingly.
1810 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1811 julong reasonable_minimum = (julong)(OldSize + NewSize);
1812
1813 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1814
1815 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1816
1817 if (InitialHeapSize == 0) {
1818 julong reasonable_initial = phys_mem / InitialRAMFraction;
1819
1820 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1821 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1822
1823 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1824
1825 if (PrintGCDetails && Verbose) {
1826 // Cannot use gclog_or_tty yet.
1827 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1828 }
1829 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1830 }
1831 // If the minimum heap size has not been set (via -Xms),
1832 // synchronize with InitialHeapSize to avoid errors with the default value.
1833 if (min_heap_size() == 0) {
1834 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1835 if (PrintGCDetails && Verbose) {
1836 // Cannot use gclog_or_tty yet.
1837 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1838 }
1839 }
1840 }
1841 }
1842
1843 // Set up runtime image flags
1844 void Arguments::set_runtime_image_flags() {
1845 #ifdef _LP64
1846 // Memory map image file by default on 64 bit machines.
1847 if (FLAG_IS_DEFAULT(MemoryMapImage)) {
1848 FLAG_SET_ERGO(bool, MemoryMapImage, true);
1849 }
1850 #endif
1851 }
1852
1853 // This must be called after ergonomics.
1854 void Arguments::set_bytecode_flags() {
1855 if (!RewriteBytecodes) {
1856 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1857 }
1858 }
1859
1860 // Aggressive optimization flags -XX:+AggressiveOpts
1861 void Arguments::set_aggressive_opts_flags() {
1862 #ifdef COMPILER2
1863 if (AggressiveUnboxing) {
1864 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1865 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1866 } else if (!EliminateAutoBox) {
1867 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1868 AggressiveUnboxing = false;
1869 }
1870 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1871 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1872 } else if (!DoEscapeAnalysis) {
1873 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1874 AggressiveUnboxing = false;
1875 }
1876 }
1877 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1878 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1879 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1880 }
1881 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1882 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1883 }
1884
1885 // Feed the cache size setting into the JDK
1886 char buffer[1024];
1887 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1888 add_property(buffer);
1889 }
1890 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1891 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1892 }
1893 #endif
1894
1895 if (AggressiveOpts) {
1896 // Sample flag setting code
1897 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1898 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1899 // }
1900 }
1901 }
1902
1903 //===========================================================================================================
1904 // Parsing of java.compiler property
1905
1906 void Arguments::process_java_compiler_argument(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 // JNI hooks
2829 } else if (match_option(option, "-Xcheck", &tail)) {
2830 if (!strcmp(tail, ":jni")) {
2831 #if !INCLUDE_JNI_CHECK
2832 warning("JNI CHECKING is not supported in this VM");
2833 #else
2834 CheckJNICalls = true;
2835 #endif // INCLUDE_JNI_CHECK
2836 } else if (is_bad_option(option, args->ignoreUnrecognized,
2837 "check")) {
2838 return JNI_EINVAL;
2839 }
2840 } else if (match_option(option, "vfprintf")) {
2841 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2842 } else if (match_option(option, "exit")) {
2843 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2844 } else if (match_option(option, "abort")) {
2845 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2846 // -XX:+AggressiveHeap
2847 } else if (match_option(option, "-XX:+AggressiveHeap")) {
2848
2849 // This option inspects the machine and attempts to set various
2850 // parameters to be optimal for long-running, memory allocation
2851 // intensive jobs. It is intended for machines with large
2852 // amounts of cpu and memory.
2853
2854 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2855 // VM, but we may not be able to represent the total physical memory
2856 // available (like having 8gb of memory on a box but using a 32bit VM).
2857 // Thus, we need to make sure we're using a julong for intermediate
2858 // calculations.
2859 julong initHeapSize;
2860 julong total_memory = os::physical_memory();
2861
2862 if (total_memory < (julong)256*M) {
2863 jio_fprintf(defaultStream::error_stream(),
2864 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2865 vm_exit(1);
2866 }
2867
2868 // The heap size is half of available memory, or (at most)
2869 // all of possible memory less 160mb (leaving room for the OS
2870 // when using ISM). This is the maximum; because adaptive sizing
2871 // is turned on below, the actual space used may be smaller.
2872
2873 initHeapSize = MIN2(total_memory / (julong)2,
2874 total_memory - (julong)160*M);
2875
2876 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2877
2878 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2879 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2880 return JNI_EINVAL;
2881 }
2882 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2883 return JNI_EINVAL;
2884 }
2885 // Currently the minimum size and the initial heap sizes are the same.
2886 set_min_heap_size(initHeapSize);
2887 }
2888 if (FLAG_IS_DEFAULT(NewSize)) {
2889 // Make the young generation 3/8ths of the total heap.
2890 if (FLAG_SET_CMDLINE(size_t, NewSize,
2891 ((julong)MaxHeapSize / (julong)8) * (julong)3) != Flag::SUCCESS) {
2892 return JNI_EINVAL;
2893 }
2894 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2895 return JNI_EINVAL;
2896 }
2897 }
2898
2899 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2900 FLAG_SET_DEFAULT(UseLargePages, true);
2901 #endif
2902
2903 // Increase some data structure sizes for efficiency
2904 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2905 return JNI_EINVAL;
2906 }
2907 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2908 return JNI_EINVAL;
2909 }
2910 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256*K) != Flag::SUCCESS) {
2911 return JNI_EINVAL;
2912 }
2913
2914 // See the OldPLABSize comment below, but replace 'after promotion'
2915 // with 'after copying'. YoungPLABSize is the size of the survivor
2916 // space per-gc-thread buffers. The default is 4kw.
2917 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K) != Flag::SUCCESS) { // Note: this is in words
2918 return JNI_EINVAL;
2919 }
2920
2921 // OldPLABSize is the size of the buffers in the old gen that
2922 // UseParallelGC uses to promote live data that doesn't fit in the
2923 // survivor spaces. At any given time, there's one for each gc thread.
2924 // The default size is 1kw. These buffers are rarely used, since the
2925 // survivor spaces are usually big enough. For specjbb, however, there
2926 // are occasions when there's lots of live data in the young gen
2927 // and we end up promoting some of it. We don't have a definite
2928 // explanation for why bumping OldPLABSize helps, but the theory
2929 // is that a bigger PLAB results in retaining something like the
2930 // original allocation order after promotion, which improves mutator
2931 // locality. A minor effect may be that larger PLABs reduce the
2932 // number of PLAB allocation events during gc. The value of 8kw
2933 // was arrived at by experimenting with specjbb.
2934 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K) != Flag::SUCCESS) { // Note: this is in words
2935 return JNI_EINVAL;
2936 }
2937
2938 // Enable parallel GC and adaptive generation sizing
2939 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2940 return JNI_EINVAL;
2941 }
2942 FLAG_SET_DEFAULT(ParallelGCThreads,
2943 Abstract_VM_Version::parallel_worker_threads());
2944
2945 // Encourage steady state memory management
2946 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2947 return JNI_EINVAL;
2948 }
2949
2950 // This appears to improve mutator locality
2951 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2952 return JNI_EINVAL;
2953 }
2954
2955 // Get around early Solaris scheduling bug
2956 // (affinity vs other jobs on system)
2957 // but disallow DR and offlining (5008695).
2958 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2959 return JNI_EINVAL;
2960 }
2961
2962 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2963 // and the last option wins.
2964 } else if (match_option(option, "-XX:+NeverTenure")) {
2965 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
2966 return JNI_EINVAL;
2967 }
2968 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
2969 return JNI_EINVAL;
2970 }
2971 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
2972 return JNI_EINVAL;
2973 }
2974 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2975 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
2976 return JNI_EINVAL;
2977 }
2978 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
2979 return JNI_EINVAL;
2980 }
2981 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
2982 return JNI_EINVAL;
2983 }
2984 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2985 uintx max_tenuring_thresh = 0;
2986 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2987 jio_fprintf(defaultStream::error_stream(),
2988 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2989 return JNI_EINVAL;
2990 }
2991
2992 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
2993 return JNI_EINVAL;
2994 }
2995
2996 if (MaxTenuringThreshold == 0) {
2997 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
2998 return JNI_EINVAL;
2999 }
3000 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3001 return JNI_EINVAL;
3002 }
3003 } else {
3004 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3005 return JNI_EINVAL;
3006 }
3007 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3008 return JNI_EINVAL;
3009 }
3010 }
3011 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3012 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3013 return JNI_EINVAL;
3014 }
3015 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3016 return JNI_EINVAL;
3017 }
3018 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3019 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3020 return JNI_EINVAL;
3021 }
3022 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3023 return JNI_EINVAL;
3024 }
3025 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3026 #if defined(DTRACE_ENABLED)
3027 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3028 return JNI_EINVAL;
3029 }
3030 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3031 return JNI_EINVAL;
3032 }
3033 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3034 return JNI_EINVAL;
3035 }
3036 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3037 return JNI_EINVAL;
3038 }
3039 #else // defined(DTRACE_ENABLED)
3040 jio_fprintf(defaultStream::error_stream(),
3041 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3042 return JNI_EINVAL;
3043 #endif // defined(DTRACE_ENABLED)
3044 #ifdef ASSERT
3045 } else if (match_option(option, "-XX:+FullGCALot")) {
3046 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3047 return JNI_EINVAL;
3048 }
3049 // disable scavenge before parallel mark-compact
3050 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3051 return JNI_EINVAL;
3052 }
3053 #endif
3054 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3055 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3056 julong stack_size = 0;
3057 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3058 if (errcode != arg_in_range) {
3059 jio_fprintf(defaultStream::error_stream(),
3060 "Invalid mark stack size: %s\n", option->optionString);
3061 describe_range_error(errcode);
3062 return JNI_EINVAL;
3063 }
3064 jio_fprintf(defaultStream::error_stream(),
3065 "Please use -XX:MarkStackSize in place of "
3066 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n");
3067 if (FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size) != Flag::SUCCESS) {
3068 return JNI_EINVAL;
3069 }
3070 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3071 julong max_stack_size = 0;
3072 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3073 if (errcode != arg_in_range) {
3074 jio_fprintf(defaultStream::error_stream(),
3075 "Invalid maximum mark stack size: %s\n",
3076 option->optionString);
3077 describe_range_error(errcode);
3078 return JNI_EINVAL;
3079 }
3080 jio_fprintf(defaultStream::error_stream(),
3081 "Please use -XX:MarkStackSizeMax in place of "
3082 "-XX:CMSMarkStackSizeMax in the future\n");
3083 if (FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size) != Flag::SUCCESS) {
3084 return JNI_EINVAL;
3085 }
3086 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3087 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3088 uintx conc_threads = 0;
3089 if (!parse_uintx(tail, &conc_threads, 1)) {
3090 jio_fprintf(defaultStream::error_stream(),
3091 "Invalid concurrent threads: %s\n", option->optionString);
3092 return JNI_EINVAL;
3093 }
3094 jio_fprintf(defaultStream::error_stream(),
3095 "Please use -XX:ConcGCThreads in place of "
3096 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n");
3097 if (FLAG_SET_CMDLINE(uint, ConcGCThreads, conc_threads) != Flag::SUCCESS) {
3098 return JNI_EINVAL;
3099 }
3100 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3101 julong max_direct_memory_size = 0;
3102 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3103 if (errcode != arg_in_range) {
3104 jio_fprintf(defaultStream::error_stream(),
3105 "Invalid maximum direct memory size: %s\n",
3106 option->optionString);
3107 describe_range_error(errcode);
3108 return JNI_EINVAL;
3109 }
3110 if (FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size) != Flag::SUCCESS) {
3111 return JNI_EINVAL;
3112 }
3113 #if !INCLUDE_MANAGEMENT
3114 } else if (match_option(option, "-XX:+ManagementServer")) {
3115 jio_fprintf(defaultStream::error_stream(),
3116 "ManagementServer is not supported in this VM.\n");
3117 return JNI_ERR;
3118 #endif // INCLUDE_MANAGEMENT
3119 // CreateMinidumpOnCrash is removed, and replaced by CreateCoredumpOnCrash
3120 } else if (match_option(option, "-XX:+CreateMinidumpOnCrash")) {
3121 if (FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, true) != Flag::SUCCESS) {
3122 return JNI_EINVAL;
3123 }
3124 jio_fprintf(defaultStream::output_stream(),
3125 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is on\n");
3126 } else if (match_option(option, "-XX:-CreateMinidumpOnCrash")) {
3127 if (FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, false) != Flag::SUCCESS) {
3128 return JNI_EINVAL;
3129 }
3130 jio_fprintf(defaultStream::output_stream(),
3131 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is off\n");
3132 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3133 // Skip -XX:Flags= since that case has already been handled
3134 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3135 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3136 return JNI_EINVAL;
3137 }
3138 }
3139 // Unknown option
3140 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3141 return JNI_ERR;
3142 }
3143 }
3144
3145 // PrintSharedArchiveAndExit will turn on
3146 // -Xshare:on
3147 // -XX:+TraceClassPaths
3148 if (PrintSharedArchiveAndExit) {
3149 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3150 return JNI_EINVAL;
3151 }
3152 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3153 return JNI_EINVAL;
3154 }
3155 if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) {
3156 return JNI_EINVAL;
3157 }
3158 }
3159
3160 // Change the default value for flags which have different default values
3161 // when working with older JDKs.
3162 #ifdef LINUX
3163 if (JDK_Version::current().compare_major(6) <= 0 &&
3164 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3165 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3166 }
3167 #endif // LINUX
3168 fix_appclasspath();
3169 return JNI_OK;
3170 }
3171
3172 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3173 //
3174 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3175 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3176 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3177 // path is treated as the current directory.
3178 //
3179 // This causes problems with CDS, which requires that all directories specified in the classpath
3180 // must be empty. In most cases, applications do NOT want to load classes from the current
3181 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3182 // scripts compatible with CDS.
3183 void Arguments::fix_appclasspath() {
3184 if (IgnoreEmptyClassPaths) {
3185 const char separator = *os::path_separator();
3186 const char* src = _java_class_path->value();
3187
3188 // skip over all the leading empty paths
3189 while (*src == separator) {
3190 src ++;
3191 }
3192
3193 char* copy = os::strdup_check_oom(src, mtInternal);
3194
3195 // trim all trailing empty paths
3196 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3197 *tail = '\0';
3198 }
3199
3200 char from[3] = {separator, separator, '\0'};
3201 char to [2] = {separator, '\0'};
3202 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3203 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3204 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3205 }
3206
3207 _java_class_path->set_value(copy);
3208 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3209 }
3210
3211 if (!PrintSharedArchiveAndExit) {
3212 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3213 }
3214 }
3215
3216 static bool has_jar_files(const char* directory) {
3217 DIR* dir = os::opendir(directory);
3218 if (dir == NULL) return false;
3219
3220 struct dirent *entry;
3221 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3222 bool hasJarFile = false;
3223 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3224 const char* name = entry->d_name;
3225 const char* ext = name + strlen(name) - 4;
3226 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3227 }
3228 FREE_C_HEAP_ARRAY(char, dbuf);
3229 os::closedir(dir);
3230 return hasJarFile ;
3231 }
3232
3233 static int check_non_empty_dirs(const char* path) {
3234 const char separator = *os::path_separator();
3235 const char* const end = path + strlen(path);
3236 int nonEmptyDirs = 0;
3237 while (path < end) {
3238 const char* tmp_end = strchr(path, separator);
3239 if (tmp_end == NULL) {
3240 if (has_jar_files(path)) {
3241 nonEmptyDirs++;
3242 jio_fprintf(defaultStream::output_stream(),
3243 "Non-empty directory: %s\n", path);
3244 }
3245 path = end;
3246 } else {
3247 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3248 memcpy(dirpath, path, tmp_end - path);
3249 dirpath[tmp_end - path] = '\0';
3250 if (has_jar_files(dirpath)) {
3251 nonEmptyDirs++;
3252 jio_fprintf(defaultStream::output_stream(),
3253 "Non-empty directory: %s\n", dirpath);
3254 }
3255 FREE_C_HEAP_ARRAY(char, dirpath);
3256 path = tmp_end + 1;
3257 }
3258 }
3259 return nonEmptyDirs;
3260 }
3261
3262 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3263 // check if the default lib/endorsed directory exists; if so, error
3264 char path[JVM_MAXPATHLEN];
3265 const char* fileSep = os::file_separator();
3266 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3267
3268 if (CheckEndorsedAndExtDirs) {
3269 int nonEmptyDirs = 0;
3270 // check endorsed directory
3271 nonEmptyDirs += check_non_empty_dirs(path);
3272 // check the extension directories
3273 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3274 if (nonEmptyDirs > 0) {
3275 return JNI_ERR;
3276 }
3277 }
3278
3279 DIR* dir = os::opendir(path);
3280 if (dir != NULL) {
3281 jio_fprintf(defaultStream::output_stream(),
3282 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3283 "in modular form will be supported via the concept of upgradeable modules.\n");
3284 os::closedir(dir);
3285 return JNI_ERR;
3286 }
3287
3288 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3289 dir = os::opendir(path);
3290 if (dir != NULL) {
3291 jio_fprintf(defaultStream::output_stream(),
3292 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3293 "Use -classpath instead.\n.");
3294 os::closedir(dir);
3295 return JNI_ERR;
3296 }
3297
3298 if (scp_assembly_required) {
3299 // Assemble the bootclasspath elements into the final path.
3300 char *combined_path = scp_p->combined_path();
3301 Arguments::set_sysclasspath(combined_path);
3302 FREE_C_HEAP_ARRAY(char, combined_path);
3303 }
3304
3305 // This must be done after all arguments have been processed.
3306 // java_compiler() true means set to "NONE" or empty.
3307 if (java_compiler() && !xdebug_mode()) {
3308 // For backwards compatibility, we switch to interpreted mode if
3309 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3310 // not specified.
3311 set_mode_flags(_int);
3312 }
3313
3314 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3315 // but like -Xint, leave compilation thresholds unaffected.
3316 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3317 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3318 set_mode_flags(_int);
3319 }
3320
3321 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3322 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3323 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3324 }
3325
3326 #ifndef COMPILER2
3327 // Don't degrade server performance for footprint
3328 if (FLAG_IS_DEFAULT(UseLargePages) &&
3329 MaxHeapSize < LargePageHeapSizeThreshold) {
3330 // No need for large granularity pages w/small heaps.
3331 // Note that large pages are enabled/disabled for both the
3332 // Java heap and the code cache.
3333 FLAG_SET_DEFAULT(UseLargePages, false);
3334 }
3335
3336 #else
3337 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3338 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3339 }
3340 #endif
3341
3342 #ifndef TIERED
3343 // Tiered compilation is undefined.
3344 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3345 #endif
3346
3347 // If we are running in a headless jre, force java.awt.headless property
3348 // to be true unless the property has already been set.
3349 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3350 if (os::is_headless_jre()) {
3351 const char* headless = Arguments::get_property("java.awt.headless");
3352 if (headless == NULL) {
3353 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3354 if (headless_env == NULL) {
3355 if (!add_property("java.awt.headless=true")) {
3356 return JNI_ENOMEM;
3357 }
3358 } else {
3359 char buffer[256];
3360 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3361 if (!add_property(buffer)) {
3362 return JNI_ENOMEM;
3363 }
3364 }
3365 }
3366 }
3367
3368 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3369 // CMS can only be used with ParNew
3370 FLAG_SET_ERGO(bool, UseParNewGC, true);
3371 }
3372
3373 if (!check_vm_args_consistency()) {
3374 return JNI_ERR;
3375 }
3376
3377 return JNI_OK;
3378 }
3379
3380 // Helper class for controlling the lifetime of JavaVMInitArgs
3381 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3382 // deleted on the destruction of the ScopedVMInitArgs object.
3383 class ScopedVMInitArgs : public StackObj {
3384 private:
3385 JavaVMInitArgs _args;
3386
3387 public:
3388 ScopedVMInitArgs() {
3389 _args.version = JNI_VERSION_1_2;
3390 _args.nOptions = 0;
3391 _args.options = NULL;
3392 _args.ignoreUnrecognized = false;
3393 }
3394
3395 // Populates the JavaVMInitArgs object represented by this
3396 // ScopedVMInitArgs object with the arguments in options. The
3397 // allocated memory is deleted by the destructor. If this method
3398 // returns anything other than JNI_OK, then this object is in a
3399 // partially constructed state, and should be abandoned.
3400 jint set_args(GrowableArray<JavaVMOption>* options) {
3401 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3402 JavaVMOption, options->length(), mtInternal);
3403 if (options_arr == NULL) {
3404 return JNI_ENOMEM;
3405 }
3406 _args.options = options_arr;
3407
3408 for (int i = 0; i < options->length(); i++) {
3409 options_arr[i] = options->at(i);
3410 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3411 if (options_arr[i].optionString == NULL) {
3412 // Rely on the destructor to do cleanup.
3413 _args.nOptions = i;
3414 return JNI_ENOMEM;
3415 }
3416 }
3417
3418 _args.nOptions = options->length();
3419 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3420 return JNI_OK;
3421 }
3422
3423 JavaVMInitArgs* get() { return &_args; }
3424
3425 ~ScopedVMInitArgs() {
3426 if (_args.options == NULL) return;
3427 for (int i = 0; i < _args.nOptions; i++) {
3428 os::free(_args.options[i].optionString);
3429 }
3430 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3431 }
3432 };
3433
3434 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3435 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3436 }
3437
3438 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3439 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3440 }
3441
3442 jint Arguments::parse_options_environment_variable(const char* name,
3443 ScopedVMInitArgs* vm_args) {
3444 char *buffer = ::getenv(name);
3445
3446 // Don't check this environment variable if user has special privileges
3447 // (e.g. unix su command).
3448 if (buffer == NULL || os::have_special_privileges()) {
3449 return JNI_OK;
3450 }
3451
3452 if ((buffer = os::strdup(buffer)) == NULL) {
3453 return JNI_ENOMEM;
3454 }
3455
3456 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3457 jio_fprintf(defaultStream::error_stream(),
3458 "Picked up %s: %s\n", name, buffer);
3459 char* rd = buffer; // pointer to the input string (rd)
3460 while (true) { // repeat for all options in the input string
3461 while (isspace(*rd)) rd++; // skip whitespace
3462 if (*rd == 0) break; // we re done when the input string is read completely
3463
3464 // The output, option string, overwrites the input string.
3465 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3466 // input string (rd).
3467 char* wrt = rd;
3468
3469 JavaVMOption option;
3470 option.optionString = wrt;
3471 options->append(option); // Fill in option
3472 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3473 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3474 int quote = *rd; // matching quote to look for
3475 rd++; // don't copy open quote
3476 while (*rd != quote) { // include everything (even spaces) up until quote
3477 if (*rd == 0) { // string termination means unmatched string
3478 jio_fprintf(defaultStream::error_stream(),
3479 "Unmatched quote in %s\n", name);
3480 delete options;
3481 os::free(buffer);
3482 return JNI_ERR;
3483 }
3484 *wrt++ = *rd++; // copy to option string
3485 }
3486 rd++; // don't copy close quote
3487 } else {
3488 *wrt++ = *rd++; // copy to option string
3489 }
3490 }
3491 if (*rd != 0) {
3492 // In this case, the assignment to wrt below will make *rd nul,
3493 // which will interfere with the next loop iteration.
3494 rd++;
3495 }
3496 *wrt = 0; // Zero terminate option
3497 }
3498
3499 // Fill out JavaVMInitArgs structure.
3500 jint status = vm_args->set_args(options);
3501
3502 delete options;
3503 os::free(buffer);
3504 return status;
3505 }
3506
3507 void Arguments::set_shared_spaces_flags() {
3508 if (DumpSharedSpaces) {
3509 if (RequireSharedSpaces) {
3510 warning("cannot dump shared archive while using shared archive");
3511 }
3512 UseSharedSpaces = false;
3513 #ifdef _LP64
3514 if (!UseCompressedOops || !UseCompressedClassPointers) {
3515 vm_exit_during_initialization(
3516 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3517 }
3518 } else {
3519 if (!UseCompressedOops || !UseCompressedClassPointers) {
3520 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3521 }
3522 #endif
3523 }
3524 }
3525
3526 #if !INCLUDE_ALL_GCS
3527 static void force_serial_gc() {
3528 FLAG_SET_DEFAULT(UseSerialGC, true);
3529 UNSUPPORTED_GC_OPTION(UseG1GC);
3530 UNSUPPORTED_GC_OPTION(UseParallelGC);
3531 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3532 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3533 UNSUPPORTED_GC_OPTION(UseParNewGC);
3534 }
3535 #endif // INCLUDE_ALL_GCS
3536
3537 // Sharing support
3538 // Construct the path to the archive
3539 static char* get_shared_archive_path() {
3540 char *shared_archive_path;
3541 if (SharedArchiveFile == NULL) {
3542 char jvm_path[JVM_MAXPATHLEN];
3543 os::jvm_path(jvm_path, sizeof(jvm_path));
3544 char *end = strrchr(jvm_path, *os::file_separator());
3545 if (end != NULL) *end = '\0';
3546 size_t jvm_path_len = strlen(jvm_path);
3547 size_t file_sep_len = strlen(os::file_separator());
3548 const size_t len = jvm_path_len + file_sep_len + 20;
3549 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3550 if (shared_archive_path != NULL) {
3551 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3552 jvm_path, os::file_separator());
3553 }
3554 } else {
3555 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3556 }
3557 return shared_archive_path;
3558 }
3559
3560 #ifndef PRODUCT
3561 // Determine whether LogVMOutput should be implicitly turned on.
3562 static bool use_vm_log() {
3563 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3564 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3565 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3566 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3567 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3568 return true;
3569 }
3570
3571 #ifdef COMPILER1
3572 if (PrintC1Statistics) {
3573 return true;
3574 }
3575 #endif // COMPILER1
3576
3577 #ifdef COMPILER2
3578 if (PrintOptoAssembly || PrintOptoStatistics) {
3579 return true;
3580 }
3581 #endif // COMPILER2
3582
3583 return false;
3584 }
3585 #endif // PRODUCT
3586
3587 static jint match_special_option_and_act(const JavaVMInitArgs* args,
3588 char** flags_file) {
3589 // Remaining part of option string
3590 const char* tail;
3591
3592 for (int index = 0; index < args->nOptions; index++) {
3593 const JavaVMOption* option = args->options + index;
3594 if (ArgumentsExt::process_options(option)) {
3595 continue;
3596 }
3597 if (match_option(option, "-XX:Flags=", &tail)) {
3598 *flags_file = (char *) tail;
3599 continue;
3600 }
3601 if (match_option(option, "-XX:+PrintVMOptions")) {
3602 PrintVMOptions = true;
3603 continue;
3604 }
3605 if (match_option(option, "-XX:-PrintVMOptions")) {
3606 PrintVMOptions = false;
3607 continue;
3608 }
3609 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3610 IgnoreUnrecognizedVMOptions = true;
3611 continue;
3612 }
3613 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3614 IgnoreUnrecognizedVMOptions = false;
3615 continue;
3616 }
3617 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3618 CommandLineFlags::printFlags(tty, false);
3619 vm_exit(0);
3620 }
3621 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3622 #if INCLUDE_NMT
3623 // The launcher did not setup nmt environment variable properly.
3624 if (!MemTracker::check_launcher_nmt_support(tail)) {
3625 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3626 }
3627
3628 // Verify if nmt option is valid.
3629 if (MemTracker::verify_nmt_option()) {
3630 // Late initialization, still in single-threaded mode.
3631 if (MemTracker::tracking_level() >= NMT_summary) {
3632 MemTracker::init();
3633 }
3634 } else {
3635 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3636 }
3637 continue;
3638 #else
3639 jio_fprintf(defaultStream::error_stream(),
3640 "Native Memory Tracking is not supported in this VM\n");
3641 return JNI_ERR;
3642 #endif
3643 }
3644
3645 #ifndef PRODUCT
3646 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3647 CommandLineFlags::printFlags(tty, true);
3648 vm_exit(0);
3649 }
3650 #endif
3651 }
3652 return JNI_OK;
3653 }
3654
3655 static void print_options(const JavaVMInitArgs *args) {
3656 const char* tail;
3657 for (int index = 0; index < args->nOptions; index++) {
3658 const JavaVMOption *option = args->options + index;
3659 if (match_option(option, "-XX:", &tail)) {
3660 logOption(tail);
3661 }
3662 }
3663 }
3664
3665 // Parse entry point called from JNI_CreateJavaVM
3666
3667 jint Arguments::parse(const JavaVMInitArgs* args) {
3668
3669 // Initialize ranges and constraints
3670 CommandLineFlagRangeList::init();
3671 CommandLineFlagConstraintList::init();
3672
3673 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3674 const char* hotspotrc = ".hotspotrc";
3675 char* flags_file = NULL;
3676 bool settings_file_specified = false;
3677 bool needs_hotspotrc_warning = false;
3678 ScopedVMInitArgs java_tool_options_args;
3679 ScopedVMInitArgs java_options_args;
3680
3681 jint code =
3682 parse_java_tool_options_environment_variable(&java_tool_options_args);
3683 if (code != JNI_OK) {
3684 return code;
3685 }
3686
3687 code = parse_java_options_environment_variable(&java_options_args);
3688 if (code != JNI_OK) {
3689 return code;
3690 }
3691
3692 code =
3693 match_special_option_and_act(java_tool_options_args.get(), &flags_file);
3694 if (code != JNI_OK) {
3695 return code;
3696 }
3697
3698 code = match_special_option_and_act(args, &flags_file);
3699 if (code != JNI_OK) {
3700 return code;
3701 }
3702
3703 code = match_special_option_and_act(java_options_args.get(), &flags_file);
3704 if (code != JNI_OK) {
3705 return code;
3706 }
3707
3708 settings_file_specified = (flags_file != NULL);
3709
3710 if (IgnoreUnrecognizedVMOptions) {
3711 // uncast const to modify the flag args->ignoreUnrecognized
3712 *(jboolean*)(&args->ignoreUnrecognized) = true;
3713 java_tool_options_args.get()->ignoreUnrecognized = true;
3714 java_options_args.get()->ignoreUnrecognized = true;
3715 }
3716
3717 // Parse specified settings file
3718 if (settings_file_specified) {
3719 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3720 return JNI_EINVAL;
3721 }
3722 } else {
3723 #ifdef ASSERT
3724 // Parse default .hotspotrc settings file
3725 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3726 return JNI_EINVAL;
3727 }
3728 #else
3729 struct stat buf;
3730 if (os::stat(hotspotrc, &buf) == 0) {
3731 needs_hotspotrc_warning = true;
3732 }
3733 #endif
3734 }
3735
3736 if (PrintVMOptions) {
3737 print_options(java_tool_options_args.get());
3738 print_options(args);
3739 print_options(java_options_args.get());
3740 }
3741
3742 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3743 jint result = parse_vm_init_args(java_tool_options_args.get(),
3744 java_options_args.get(), args);
3745
3746 if (result != JNI_OK) {
3747 return result;
3748 }
3749
3750 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3751 SharedArchivePath = get_shared_archive_path();
3752 if (SharedArchivePath == NULL) {
3753 return JNI_ENOMEM;
3754 }
3755
3756 // Set up VerifySharedSpaces
3757 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3758 VerifySharedSpaces = true;
3759 }
3760
3761 // Delay warning until here so that we've had a chance to process
3762 // the -XX:-PrintWarnings flag
3763 if (needs_hotspotrc_warning) {
3764 warning("%s file is present but has been ignored. "
3765 "Run with -XX:Flags=%s to load the file.",
3766 hotspotrc, hotspotrc);
3767 }
3768
3769 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3770 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3771 #endif
3772
3773 ArgumentsExt::report_unsupported_options();
3774
3775 #ifndef PRODUCT
3776 if (TraceBytecodesAt != 0) {
3777 TraceBytecodes = true;
3778 }
3779 if (CountCompiledCalls) {
3780 if (UseCounterDecay) {
3781 warning("UseCounterDecay disabled because CountCalls is set");
3782 UseCounterDecay = false;
3783 }
3784 }
3785 #endif // PRODUCT
3786
3787 if (ScavengeRootsInCode == 0) {
3788 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3789 warning("forcing ScavengeRootsInCode non-zero");
3790 }
3791 ScavengeRootsInCode = 1;
3792 }
3793
3794 if (PrintGCDetails) {
3795 // Turn on -verbose:gc options as well
3796 PrintGC = true;
3797 }
3798
3799 // Set object alignment values.
3800 set_object_alignment();
3801
3802 #if !INCLUDE_ALL_GCS
3803 force_serial_gc();
3804 #endif // INCLUDE_ALL_GCS
3805 #if !INCLUDE_CDS
3806 if (DumpSharedSpaces || RequireSharedSpaces) {
3807 jio_fprintf(defaultStream::error_stream(),
3808 "Shared spaces are not supported in this VM\n");
3809 return JNI_ERR;
3810 }
3811 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3812 warning("Shared spaces are not supported in this VM");
3813 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3814 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3815 }
3816 no_shared_spaces("CDS Disabled");
3817 #endif // INCLUDE_CDS
3818
3819 return JNI_OK;
3820 }
3821
3822 jint Arguments::apply_ergo() {
3823
3824 // Set flags based on ergonomics.
3825 set_ergonomics_flags();
3826
3827 set_shared_spaces_flags();
3828
3829 // Check the GC selections again.
3830 if (!check_gc_consistency()) {
3831 return JNI_EINVAL;
3832 }
3833
3834 if (TieredCompilation) {
3835 set_tiered_flags();
3836 } else {
3837 int max_compilation_policy_choice = 1;
3838 #ifdef COMPILER2
3839 max_compilation_policy_choice = 2;
3840 #endif
3841 // Check if the policy is valid.
3842 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
3843 vm_exit_during_initialization(
3844 "Incompatible compilation policy selected", NULL);
3845 }
3846 // Scale CompileThreshold
3847 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
3848 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
3849 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
3850 }
3851 }
3852
3853 #ifdef COMPILER2
3854 #ifndef PRODUCT
3855 if (PrintIdealGraphLevel > 0) {
3856 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3857 }
3858 #endif
3859 #endif
3860
3861 // Set heap size based on available physical memory
3862 set_heap_size();
3863
3864 ArgumentsExt::set_gc_specific_flags();
3865
3866 // Initialize Metaspace flags and alignments
3867 Metaspace::ergo_initialize();
3868
3869 // Set bytecode rewriting flags
3870 set_bytecode_flags();
3871
3872 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3873 set_aggressive_opts_flags();
3874
3875 // Turn off biased locking for locking debug mode flags,
3876 // which are subtly different from each other but neither works with
3877 // biased locking
3878 if (UseHeavyMonitors
3879 #ifdef COMPILER1
3880 || !UseFastLocking
3881 #endif // COMPILER1
3882 ) {
3883 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3884 // flag set to true on command line; warn the user that they
3885 // can't enable biased locking here
3886 warning("Biased Locking is not supported with locking debug flags"
3887 "; ignoring UseBiasedLocking flag." );
3888 }
3889 UseBiasedLocking = false;
3890 }
3891
3892 #ifdef ZERO
3893 // Clear flags not supported on zero.
3894 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3895 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3896 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3897 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3898 #endif // CC_INTERP
3899
3900 #ifdef COMPILER2
3901 if (!EliminateLocks) {
3902 EliminateNestedLocks = false;
3903 }
3904 if (!Inline) {
3905 IncrementalInline = false;
3906 }
3907 #ifndef PRODUCT
3908 if (!IncrementalInline) {
3909 AlwaysIncrementalInline = false;
3910 }
3911 #endif
3912 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3913 // nothing to use the profiling, turn if off
3914 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3915 }
3916 #endif
3917
3918 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3919 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3920 DebugNonSafepoints = true;
3921 }
3922
3923 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3924 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3925 }
3926
3927 #ifndef PRODUCT
3928 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3929 if (use_vm_log()) {
3930 LogVMOutput = true;
3931 }
3932 }
3933 #endif // PRODUCT
3934
3935 if (PrintCommandLineFlags) {
3936 CommandLineFlags::printSetFlags(tty);
3937 }
3938
3939 // Apply CPU specific policy for the BiasedLocking
3940 if (UseBiasedLocking) {
3941 if (!VM_Version::use_biased_locking() &&
3942 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3943 UseBiasedLocking = false;
3944 }
3945 }
3946 #ifdef COMPILER2
3947 if (!UseBiasedLocking || EmitSync != 0) {
3948 UseOptoBiasInlining = false;
3949 }
3950 #endif
3951
3952 return JNI_OK;
3953 }
3954
3955 jint Arguments::adjust_after_os() {
3956 if (UseNUMA) {
3957 if (UseParallelGC || UseParallelOldGC) {
3958 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3959 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3960 }
3961 }
3962 // UseNUMAInterleaving is set to ON for all collectors and
3963 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3964 // such as the parallel collector for Linux and Solaris will
3965 // interleave old gen and survivor spaces on top of NUMA
3966 // allocation policy for the eden space.
3967 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3968 // all platforms and ParallelGC on Windows will interleave all
3969 // of the heap spaces across NUMA nodes.
3970 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3971 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3972 }
3973 }
3974 return JNI_OK;
3975 }
3976
3977 int Arguments::PropertyList_count(SystemProperty* pl) {
3978 int count = 0;
3979 while(pl != NULL) {
3980 count++;
3981 pl = pl->next();
3982 }
3983 return count;
3984 }
3985
3986 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3987 assert(key != NULL, "just checking");
3988 SystemProperty* prop;
3989 for (prop = pl; prop != NULL; prop = prop->next()) {
3990 if (strcmp(key, prop->key()) == 0) return prop->value();
3991 }
3992 return NULL;
3993 }
3994
3995 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3996 int count = 0;
3997 const char* ret_val = NULL;
3998
3999 while(pl != NULL) {
4000 if(count >= index) {
4001 ret_val = pl->key();
4002 break;
4003 }
4004 count++;
4005 pl = pl->next();
4006 }
4007
4008 return ret_val;
4009 }
4010
4011 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4012 int count = 0;
4013 char* ret_val = NULL;
4014
4015 while(pl != NULL) {
4016 if(count >= index) {
4017 ret_val = pl->value();
4018 break;
4019 }
4020 count++;
4021 pl = pl->next();
4022 }
4023
4024 return ret_val;
4025 }
4026
4027 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4028 SystemProperty* p = *plist;
4029 if (p == NULL) {
4030 *plist = new_p;
4031 } else {
4032 while (p->next() != NULL) {
4033 p = p->next();
4034 }
4035 p->set_next(new_p);
4036 }
4037 }
4038
4039 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4040 if (plist == NULL)
4041 return;
4042
4043 SystemProperty* new_p = new SystemProperty(k, v, true);
4044 PropertyList_add(plist, new_p);
4045 }
4046
4047 void Arguments::PropertyList_add(SystemProperty *element) {
4048 PropertyList_add(&_system_properties, element);
4049 }
4050
4051 // This add maintains unique property key in the list.
4052 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4053 if (plist == NULL)
4054 return;
4055
4056 // If property key exist then update with new value.
4057 SystemProperty* prop;
4058 for (prop = *plist; prop != NULL; prop = prop->next()) {
4059 if (strcmp(k, prop->key()) == 0) {
4060 if (append) {
4061 prop->append_value(v);
4062 } else {
4063 prop->set_value(v);
4064 }
4065 return;
4066 }
4067 }
4068
4069 PropertyList_add(plist, k, v);
4070 }
4071
4072 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4073 // Returns true if all of the source pointed by src has been copied over to
4074 // the destination buffer pointed by buf. Otherwise, returns false.
4075 // Notes:
4076 // 1. If the length (buflen) of the destination buffer excluding the
4077 // NULL terminator character is not long enough for holding the expanded
4078 // pid characters, it also returns false instead of returning the partially
4079 // expanded one.
4080 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4081 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4082 char* buf, size_t buflen) {
4083 const char* p = src;
4084 char* b = buf;
4085 const char* src_end = &src[srclen];
4086 char* buf_end = &buf[buflen - 1];
4087
4088 while (p < src_end && b < buf_end) {
4089 if (*p == '%') {
4090 switch (*(++p)) {
4091 case '%': // "%%" ==> "%"
4092 *b++ = *p++;
4093 break;
4094 case 'p': { // "%p" ==> current process id
4095 // buf_end points to the character before the last character so
4096 // that we could write '\0' to the end of the buffer.
4097 size_t buf_sz = buf_end - b + 1;
4098 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4099
4100 // if jio_snprintf fails or the buffer is not long enough to hold
4101 // the expanded pid, returns false.
4102 if (ret < 0 || ret >= (int)buf_sz) {
4103 return false;
4104 } else {
4105 b += ret;
4106 assert(*b == '\0', "fail in copy_expand_pid");
4107 if (p == src_end && b == buf_end + 1) {
4108 // reach the end of the buffer.
4109 return true;
4110 }
4111 }
4112 p++;
4113 break;
4114 }
4115 default :
4116 *b++ = '%';
4117 }
4118 } else {
4119 *b++ = *p++;
4120 }
4121 }
4122 *b = '\0';
4123 return (p == src_end); // return false if not all of the source was copied
4124 }