1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "code/codeCacheExtensions.hpp"
31 #include "compiler/compilerOracle.hpp"
32 #include "gc/shared/cardTableRS.hpp"
33 #include "gc/shared/genCollectedHeap.hpp"
34 #include "gc/shared/referenceProcessor.hpp"
35 #include "gc/shared/taskqueue.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/universe.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "prims/jvmtiExport.hpp"
40 #include "runtime/arguments.hpp"
41 #include "runtime/arguments_ext.hpp"
42 #include "runtime/commandLineFlagConstraintList.hpp"
43 #include "runtime/commandLineFlagRangeList.hpp"
44 #include "runtime/globals.hpp"
45 #include "runtime/globals_extension.hpp"
46 #include "runtime/java.hpp"
47 #include "runtime/os.hpp"
48 #include "runtime/vm_version.hpp"
49 #include "services/management.hpp"
50 #include "services/memTracker.hpp"
51 #include "utilities/defaultStream.hpp"
52 #include "utilities/macros.hpp"
53 #include "utilities/stringUtils.hpp"
54 #if INCLUDE_ALL_GCS
55 #include "gc/cms/compactibleFreeListSpace.hpp"
56 #include "gc/g1/g1CollectedHeap.inline.hpp"
57 #include "gc/parallel/parallelScavengeHeap.hpp"
58 #endif // INCLUDE_ALL_GCS
59
60 // Note: This is a special bug reporting site for the JVM
61 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
62 #define DEFAULT_JAVA_LAUNCHER "generic"
63
64 #define UNSUPPORTED_GC_OPTION(gc) \
65 do { \
66 if (gc) { \
67 if (FLAG_IS_CMDLINE(gc)) { \
68 warning(#gc " is not supported in this VM. Using Serial GC."); \
69 } \
70 FLAG_SET_DEFAULT(gc, false); \
71 } \
72 } while(0)
73
74 char** Arguments::_jvm_flags_array = NULL;
75 int Arguments::_num_jvm_flags = 0;
76 char** Arguments::_jvm_args_array = NULL;
77 int Arguments::_num_jvm_args = 0;
78 char* Arguments::_java_command = NULL;
79 SystemProperty* Arguments::_system_properties = NULL;
80 const char* Arguments::_gc_log_filename = NULL;
81 bool Arguments::_has_profile = false;
82 size_t Arguments::_conservative_max_heap_alignment = 0;
83 size_t Arguments::_min_heap_size = 0;
84 uintx Arguments::_min_heap_free_ratio = 0;
85 uintx Arguments::_max_heap_free_ratio = 0;
86 Arguments::Mode Arguments::_mode = _mixed;
87 bool Arguments::_java_compiler = false;
88 bool Arguments::_xdebug_mode = false;
89 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
90 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
91 int Arguments::_sun_java_launcher_pid = -1;
92 bool Arguments::_sun_java_launcher_is_altjvm = false;
93
94 // These parameters are reset in method parse_vm_init_args()
95 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
96 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
97 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
98 bool Arguments::_ClipInlining = ClipInlining;
99 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
100 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
101
102 char* Arguments::SharedArchivePath = NULL;
103
104 AgentLibraryList Arguments::_libraryList;
105 AgentLibraryList Arguments::_agentList;
106
107 abort_hook_t Arguments::_abort_hook = NULL;
108 exit_hook_t Arguments::_exit_hook = NULL;
109 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
110
111
112 SystemProperty *Arguments::_sun_boot_library_path = NULL;
113 SystemProperty *Arguments::_java_library_path = NULL;
114 SystemProperty *Arguments::_java_home = NULL;
115 SystemProperty *Arguments::_java_class_path = NULL;
116 SystemProperty *Arguments::_sun_boot_class_path = NULL;
117
118 char* Arguments::_ext_dirs = NULL;
119
120 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
121 // part of the option string.
122 static bool match_option(const JavaVMOption *option, const char* name,
123 const char** tail) {
124 int len = (int)strlen(name);
125 if (strncmp(option->optionString, name, len) == 0) {
126 *tail = option->optionString + len;
127 return true;
128 } else {
129 return false;
130 }
131 }
132
133 // Check if 'option' matches 'name'. No "tail" is allowed.
134 static bool match_option(const JavaVMOption *option, const char* name) {
135 const char* tail = NULL;
136 bool result = match_option(option, name, &tail);
137 if (tail != NULL && *tail == '\0') {
138 return result;
139 } else {
140 return false;
141 }
142 }
143
144 // Return true if any of the strings in null-terminated array 'names' matches.
145 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
146 // the option must match exactly.
147 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
148 bool tail_allowed) {
149 for (/* empty */; *names != NULL; ++names) {
150 if (match_option(option, *names, tail)) {
151 if (**tail == '\0' || tail_allowed && **tail == ':') {
152 return true;
153 }
154 }
155 }
156 return false;
157 }
158
159 static void logOption(const char* opt) {
160 if (PrintVMOptions) {
161 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
162 }
163 }
164
165 // Process java launcher properties.
166 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
167 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
168 // sun.java.launcher.pid is defined.
169 // Must do this before setting up other system properties,
170 // as some of them may depend on launcher type.
171 for (int index = 0; index < args->nOptions; index++) {
172 const JavaVMOption* option = args->options + index;
173 const char* tail;
174
175 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
176 process_java_launcher_argument(tail, option->extraInfo);
177 continue;
178 }
179 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
180 if (strcmp(tail, "true") == 0) {
181 _sun_java_launcher_is_altjvm = true;
182 }
183 continue;
184 }
185 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
186 _sun_java_launcher_pid = atoi(tail);
187 continue;
188 }
189 }
190 }
191
192 // Initialize system properties key and value.
193 void Arguments::init_system_properties() {
194 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
195 "Java Virtual Machine Specification", false));
196 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
197 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
198 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
199
200 // Following are JVMTI agent writable properties.
201 // Properties values are set to NULL and they are
202 // os specific they are initialized in os::init_system_properties_values().
203 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
204 _java_library_path = new SystemProperty("java.library.path", NULL, true);
205 _java_home = new SystemProperty("java.home", NULL, true);
206 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
207
208 _java_class_path = new SystemProperty("java.class.path", "", true);
209
210 // Add to System Property list.
211 PropertyList_add(&_system_properties, _sun_boot_library_path);
212 PropertyList_add(&_system_properties, _java_library_path);
213 PropertyList_add(&_system_properties, _java_home);
214 PropertyList_add(&_system_properties, _java_class_path);
215 PropertyList_add(&_system_properties, _sun_boot_class_path);
216
217 // Set OS specific system properties values
218 os::init_system_properties_values();
219 }
220
221 // Update/Initialize System properties after JDK version number is known
222 void Arguments::init_version_specific_system_properties() {
223 enum { bufsz = 16 };
224 char buffer[bufsz];
225 const char* spec_vendor = "Sun Microsystems Inc.";
226 uint32_t spec_version = 0;
227
228 spec_vendor = "Oracle Corporation";
229 spec_version = JDK_Version::current().major_version();
230 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
231
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
234 PropertyList_add(&_system_properties,
235 new SystemProperty("java.vm.specification.version", buffer, false));
236 PropertyList_add(&_system_properties,
237 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
238 }
239
240 /**
241 * Provide a slightly more user-friendly way of eliminating -XX flags.
242 * When a flag is eliminated, it can be added to this list in order to
243 * continue accepting this flag on the command-line, while issuing a warning
244 * and ignoring the value. Once the JDK version reaches the 'accept_until'
245 * limit, we flatly refuse to admit the existence of the flag. This allows
246 * a flag to die correctly over JDK releases using HSX.
247 * But now that HSX is no longer supported only options with a future
248 * accept_until value need to be listed, and the list can be pruned
249 * on each major release.
250 */
251 typedef struct {
252 const char* name;
253 JDK_Version obsoleted_in; // when the flag went away
254 JDK_Version accept_until; // which version to start denying the existence
255 } ObsoleteFlag;
256
257 static ObsoleteFlag obsolete_jvm_flags[] = {
258 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
259 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
260 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
261 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
262 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
263 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
264 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
265 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
266 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
267 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
268 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
269 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
270 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
271 #ifndef ZERO
272 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
273 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
274 #endif // ZERO
275 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) },
276 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) },
277 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) },
278 { "ThreadSafetyMargin", JDK_Version::jdk(9), JDK_Version::jdk(10) },
279 { "LazyBootClassLoader", JDK_Version::jdk(9), JDK_Version::jdk(10) },
280 { "StarvationMonitorInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
281 { "PreInflateSpin", JDK_Version::jdk(9), JDK_Version::jdk(10) },
282 { NULL, JDK_Version(0), JDK_Version(0) }
283 };
284
285 // Returns true if the flag is obsolete and fits into the range specified
286 // for being ignored. In the case that the flag is ignored, the 'version'
287 // value is filled in with the version number when the flag became
288 // obsolete so that that value can be displayed to the user.
289 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
290 int i = 0;
291 assert(version != NULL, "Must provide a version buffer");
292 while (obsolete_jvm_flags[i].name != NULL) {
293 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
294 // <flag>=xxx form
295 // [-|+]<flag> form
296 size_t len = strlen(flag_status.name);
297 if ((strncmp(flag_status.name, s, len) == 0) &&
298 (strlen(s) == len)){
299 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
300 *version = flag_status.obsoleted_in;
301 return true;
302 }
303 }
304 i++;
305 }
306 return false;
307 }
308
309 // Constructs the system class path (aka boot class path) from the following
310 // components, in order:
311 //
312 // prefix // from -Xbootclasspath/p:...
313 // base // from os::get_system_properties() or -Xbootclasspath=
314 // suffix // from -Xbootclasspath/a:...
315 //
316 // This could be AllStatic, but it isn't needed after argument processing is
317 // complete.
318 class SysClassPath: public StackObj {
319 public:
320 SysClassPath(const char* base);
321 ~SysClassPath();
322
323 inline void set_base(const char* base);
324 inline void add_prefix(const char* prefix);
325 inline void add_suffix_to_prefix(const char* suffix);
326 inline void add_suffix(const char* suffix);
327 inline void reset_path(const char* base);
328
329 inline const char* get_base() const { return _items[_scp_base]; }
330 inline const char* get_prefix() const { return _items[_scp_prefix]; }
331 inline const char* get_suffix() const { return _items[_scp_suffix]; }
332
333 // Combine all the components into a single c-heap-allocated string; caller
334 // must free the string if/when no longer needed.
335 char* combined_path();
336
337 private:
338 // Utility routines.
339 static char* add_to_path(const char* path, const char* str, bool prepend);
340 static char* add_jars_to_path(char* path, const char* directory);
341
342 inline void reset_item_at(int index);
343
344 // Array indices for the items that make up the sysclasspath. All except the
345 // base are allocated in the C heap and freed by this class.
346 enum {
347 _scp_prefix, // from -Xbootclasspath/p:...
348 _scp_base, // the default sysclasspath
349 _scp_suffix, // from -Xbootclasspath/a:...
350 _scp_nitems // the number of items, must be last.
351 };
352
353 const char* _items[_scp_nitems];
354 };
355
356 SysClassPath::SysClassPath(const char* base) {
357 memset(_items, 0, sizeof(_items));
358 _items[_scp_base] = base;
359 }
360
361 SysClassPath::~SysClassPath() {
362 // Free everything except the base.
363 for (int i = 0; i < _scp_nitems; ++i) {
364 if (i != _scp_base) reset_item_at(i);
365 }
366 }
367
368 inline void SysClassPath::set_base(const char* base) {
369 _items[_scp_base] = base;
370 }
371
372 inline void SysClassPath::add_prefix(const char* prefix) {
373 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
374 }
375
376 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
377 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
378 }
379
380 inline void SysClassPath::add_suffix(const char* suffix) {
381 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
382 }
383
384 inline void SysClassPath::reset_item_at(int index) {
385 assert(index < _scp_nitems && index != _scp_base, "just checking");
386 if (_items[index] != NULL) {
387 FREE_C_HEAP_ARRAY(char, _items[index]);
388 _items[index] = NULL;
389 }
390 }
391
392 inline void SysClassPath::reset_path(const char* base) {
393 // Clear the prefix and suffix.
394 reset_item_at(_scp_prefix);
395 reset_item_at(_scp_suffix);
396 set_base(base);
397 }
398
399 //------------------------------------------------------------------------------
400
401
402 // Combine the bootclasspath elements, some of which may be null, into a single
403 // c-heap-allocated string.
404 char* SysClassPath::combined_path() {
405 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
406
407 size_t lengths[_scp_nitems];
408 size_t total_len = 0;
409
410 const char separator = *os::path_separator();
411
412 // Get the lengths.
413 int i;
414 for (i = 0; i < _scp_nitems; ++i) {
415 if (_items[i] != NULL) {
416 lengths[i] = strlen(_items[i]);
417 // Include space for the separator char (or a NULL for the last item).
418 total_len += lengths[i] + 1;
419 }
420 }
421 assert(total_len > 0, "empty sysclasspath not allowed");
422
423 // Copy the _items to a single string.
424 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
425 char* cp_tmp = cp;
426 for (i = 0; i < _scp_nitems; ++i) {
427 if (_items[i] != NULL) {
428 memcpy(cp_tmp, _items[i], lengths[i]);
429 cp_tmp += lengths[i];
430 *cp_tmp++ = separator;
431 }
432 }
433 *--cp_tmp = '\0'; // Replace the extra separator.
434 return cp;
435 }
436
437 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
438 char*
439 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
440 char *cp;
441
442 assert(str != NULL, "just checking");
443 if (path == NULL) {
444 size_t len = strlen(str) + 1;
445 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
446 memcpy(cp, str, len); // copy the trailing null
447 } else {
448 const char separator = *os::path_separator();
449 size_t old_len = strlen(path);
450 size_t str_len = strlen(str);
451 size_t len = old_len + str_len + 2;
452
453 if (prepend) {
454 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
455 char* cp_tmp = cp;
456 memcpy(cp_tmp, str, str_len);
457 cp_tmp += str_len;
458 *cp_tmp = separator;
459 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
460 FREE_C_HEAP_ARRAY(char, path);
461 } else {
462 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
463 char* cp_tmp = cp + old_len;
464 *cp_tmp = separator;
465 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
466 }
467 }
468 return cp;
469 }
470
471 // Scan the directory and append any jar or zip files found to path.
472 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
473 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
474 DIR* dir = os::opendir(directory);
475 if (dir == NULL) return path;
476
477 char dir_sep[2] = { '\0', '\0' };
478 size_t directory_len = strlen(directory);
479 const char fileSep = *os::file_separator();
480 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
481
482 /* Scan the directory for jars/zips, appending them to path. */
483 struct dirent *entry;
484 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
485 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
486 const char* name = entry->d_name;
487 const char* ext = name + strlen(name) - 4;
488 bool isJarOrZip = ext > name &&
489 (os::file_name_strcmp(ext, ".jar") == 0 ||
490 os::file_name_strcmp(ext, ".zip") == 0);
491 if (isJarOrZip) {
492 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
493 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
494 path = add_to_path(path, jarpath, false);
495 FREE_C_HEAP_ARRAY(char, jarpath);
496 }
497 }
498 FREE_C_HEAP_ARRAY(char, dbuf);
499 os::closedir(dir);
500 return path;
501 }
502
503 // Parses a memory size specification string.
504 static bool atomull(const char *s, julong* result) {
505 julong n = 0;
506 int args_read = 0;
507 bool is_hex = false;
508 // Skip leading 0[xX] for hexadecimal
509 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
510 s += 2;
511 is_hex = true;
512 args_read = sscanf(s, JULONG_FORMAT_X, &n);
513 } else {
514 args_read = sscanf(s, JULONG_FORMAT, &n);
515 }
516 if (args_read != 1) {
517 return false;
518 }
519 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
520 s++;
521 }
522 // 4705540: illegal if more characters are found after the first non-digit
523 if (strlen(s) > 1) {
524 return false;
525 }
526 switch (*s) {
527 case 'T': case 't':
528 *result = n * G * K;
529 // Check for overflow.
530 if (*result/((julong)G * K) != n) return false;
531 return true;
532 case 'G': case 'g':
533 *result = n * G;
534 if (*result/G != n) return false;
535 return true;
536 case 'M': case 'm':
537 *result = n * M;
538 if (*result/M != n) return false;
539 return true;
540 case 'K': case 'k':
541 *result = n * K;
542 if (*result/K != n) return false;
543 return true;
544 case '\0':
545 *result = n;
546 return true;
547 default:
548 return false;
549 }
550 }
551
552 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
553 if (size < min_size) return arg_too_small;
554 // Check that size will fit in a size_t (only relevant on 32-bit)
555 if (size > max_uintx) return arg_too_big;
556 return arg_in_range;
557 }
558
559 // Describe an argument out of range error
560 void Arguments::describe_range_error(ArgsRange errcode) {
561 switch(errcode) {
562 case arg_too_big:
563 jio_fprintf(defaultStream::error_stream(),
564 "The specified size exceeds the maximum "
565 "representable size.\n");
566 break;
567 case arg_too_small:
568 case arg_unreadable:
569 case arg_in_range:
570 // do nothing for now
571 break;
572 default:
573 ShouldNotReachHere();
574 }
575 }
576
577 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
578 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
579 return true;
580 } else {
581 return false;
582 }
583 }
584
585 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
586 double v;
587 if (sscanf(value, "%lf", &v) != 1) {
588 return false;
589 }
590
591 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
592 return true;
593 }
594 return false;
595 }
596
597 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
598 julong v;
599 int int_v;
600 intx intx_v;
601 bool is_neg = false;
602 // Check the sign first since atomull() parses only unsigned values.
603 if (*value == '-') {
604 if ((CommandLineFlags::intxAt(name, &intx_v) != Flag::SUCCESS) && (CommandLineFlags::intAt(name, &int_v) != Flag::SUCCESS)) {
605 return false;
606 }
607 value++;
608 is_neg = true;
609 }
610 if (!atomull(value, &v)) {
611 return false;
612 }
613 int_v = (int) v;
614 if (is_neg) {
615 int_v = -int_v;
616 }
617 if (CommandLineFlags::intAtPut(name, &int_v, origin) == Flag::SUCCESS) {
618 return true;
619 }
620 uint uint_v = (uint) v;
621 if (!is_neg && CommandLineFlags::uintAtPut(name, &uint_v, origin) == Flag::SUCCESS) {
622 return true;
623 }
624 intx_v = (intx) v;
625 if (is_neg) {
626 intx_v = -intx_v;
627 }
628 if (CommandLineFlags::intxAtPut(name, &intx_v, origin) == Flag::SUCCESS) {
629 return true;
630 }
631 uintx uintx_v = (uintx) v;
632 if (!is_neg && (CommandLineFlags::uintxAtPut(name, &uintx_v, origin) == Flag::SUCCESS)) {
633 return true;
634 }
635 uint64_t uint64_t_v = (uint64_t) v;
636 if (!is_neg && (CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin) == Flag::SUCCESS)) {
637 return true;
638 }
639 size_t size_t_v = (size_t) v;
640 if (!is_neg && (CommandLineFlags::size_tAtPut(name, &size_t_v, origin) == Flag::SUCCESS)) {
641 return true;
642 }
643 return false;
644 }
645
646 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
647 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
648 // Contract: CommandLineFlags always returns a pointer that needs freeing.
649 FREE_C_HEAP_ARRAY(char, value);
650 return true;
651 }
652
653 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
654 const char* old_value = "";
655 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
656 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
657 size_t new_len = strlen(new_value);
658 const char* value;
659 char* free_this_too = NULL;
660 if (old_len == 0) {
661 value = new_value;
662 } else if (new_len == 0) {
663 value = old_value;
664 } else {
665 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
666 // each new setting adds another LINE to the switch:
667 sprintf(buf, "%s\n%s", old_value, new_value);
668 value = buf;
669 free_this_too = buf;
670 }
671 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
672 // CommandLineFlags always returns a pointer that needs freeing.
673 FREE_C_HEAP_ARRAY(char, value);
674 if (free_this_too != NULL) {
675 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
676 FREE_C_HEAP_ARRAY(char, free_this_too);
677 }
678 return true;
679 }
680
681 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
682
683 // range of acceptable characters spelled out for portability reasons
684 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
685 #define BUFLEN 255
686 char name[BUFLEN+1];
687 char dummy;
688
689 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
690 return set_bool_flag(name, false, origin);
691 }
692 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
693 return set_bool_flag(name, true, origin);
694 }
695
696 char punct;
697 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
698 const char* value = strchr(arg, '=') + 1;
699 Flag* flag = Flag::find_flag(name, strlen(name));
700 if (flag != NULL && flag->is_ccstr()) {
701 if (flag->ccstr_accumulates()) {
702 return append_to_string_flag(name, value, origin);
703 } else {
704 if (value[0] == '\0') {
705 value = NULL;
706 }
707 return set_string_flag(name, value, origin);
708 }
709 }
710 }
711
712 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
713 const char* value = strchr(arg, '=') + 1;
714 // -XX:Foo:=xxx will reset the string flag to the given value.
715 if (value[0] == '\0') {
716 value = NULL;
717 }
718 return set_string_flag(name, value, origin);
719 }
720
721 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
722 #define SIGNED_NUMBER_RANGE "[-0123456789]"
723 #define NUMBER_RANGE "[0123456789]"
724 char value[BUFLEN + 1];
725 char value2[BUFLEN + 1];
726 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
727 // Looks like a floating-point number -- try again with more lenient format string
728 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
729 return set_fp_numeric_flag(name, value, origin);
730 }
731 }
732
733 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
734 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
735 return set_numeric_flag(name, value, origin);
736 }
737
738 return false;
739 }
740
741 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
742 assert(bldarray != NULL, "illegal argument");
743
744 if (arg == NULL) {
745 return;
746 }
747
748 int new_count = *count + 1;
749
750 // expand the array and add arg to the last element
751 if (*bldarray == NULL) {
752 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
753 } else {
754 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
755 }
756 (*bldarray)[*count] = os::strdup_check_oom(arg);
757 *count = new_count;
758 }
759
760 void Arguments::build_jvm_args(const char* arg) {
761 add_string(&_jvm_args_array, &_num_jvm_args, arg);
762 }
763
764 void Arguments::build_jvm_flags(const char* arg) {
765 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
766 }
767
768 // utility function to return a string that concatenates all
769 // strings in a given char** array
770 const char* Arguments::build_resource_string(char** args, int count) {
771 if (args == NULL || count == 0) {
772 return NULL;
773 }
774 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
775 for (int i = 1; i < count; i++) {
776 length += strlen(args[i]) + 1; // add 1 for a space
777 }
778 char* s = NEW_RESOURCE_ARRAY(char, length);
779 strcpy(s, args[0]);
780 for (int j = 1; j < count; j++) {
781 strcat(s, " ");
782 strcat(s, args[j]);
783 }
784 return (const char*) s;
785 }
786
787 void Arguments::print_on(outputStream* st) {
788 st->print_cr("VM Arguments:");
789 if (num_jvm_flags() > 0) {
790 st->print("jvm_flags: "); print_jvm_flags_on(st);
791 st->cr();
792 }
793 if (num_jvm_args() > 0) {
794 st->print("jvm_args: "); print_jvm_args_on(st);
795 st->cr();
796 }
797 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
798 if (_java_class_path != NULL) {
799 char* path = _java_class_path->value();
800 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
801 }
802 st->print_cr("Launcher Type: %s", _sun_java_launcher);
803 }
804
805 void Arguments::print_summary_on(outputStream* st) {
806 // Print the command line. Environment variables that are helpful for
807 // reproducing the problem are written later in the hs_err file.
808 // flags are from setting file
809 if (num_jvm_flags() > 0) {
810 st->print_raw("Settings File: ");
811 print_jvm_flags_on(st);
812 st->cr();
813 }
814 // args are the command line and environment variable arguments.
815 st->print_raw("Command Line: ");
816 if (num_jvm_args() > 0) {
817 print_jvm_args_on(st);
818 }
819 // this is the classfile and any arguments to the java program
820 if (java_command() != NULL) {
821 st->print("%s", java_command());
822 }
823 st->cr();
824 }
825
826 void Arguments::print_jvm_flags_on(outputStream* st) {
827 if (_num_jvm_flags > 0) {
828 for (int i=0; i < _num_jvm_flags; i++) {
829 st->print("%s ", _jvm_flags_array[i]);
830 }
831 }
832 }
833
834 void Arguments::print_jvm_args_on(outputStream* st) {
835 if (_num_jvm_args > 0) {
836 for (int i=0; i < _num_jvm_args; i++) {
837 st->print("%s ", _jvm_args_array[i]);
838 }
839 }
840 }
841
842 bool Arguments::process_argument(const char* arg,
843 jboolean ignore_unrecognized, Flag::Flags origin) {
844
845 JDK_Version since = JDK_Version();
846
847 if (parse_argument(arg, origin) || ignore_unrecognized) {
848 return true;
849 }
850
851 // Determine if the flag has '+', '-', or '=' characters.
852 bool has_plus_minus = (*arg == '+' || *arg == '-');
853 const char* const argname = has_plus_minus ? arg + 1 : arg;
854
855 size_t arg_len;
856 const char* equal_sign = strchr(argname, '=');
857 if (equal_sign == NULL) {
858 arg_len = strlen(argname);
859 } else {
860 arg_len = equal_sign - argname;
861 }
862
863 // Only make the obsolete check for valid arguments.
864 if (arg_len <= BUFLEN) {
865 // Construct a string which consists only of the argument name without '+', '-', or '='.
866 char stripped_argname[BUFLEN+1];
867 strncpy(stripped_argname, argname, arg_len);
868 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
869
870 if (is_newly_obsolete(stripped_argname, &since)) {
871 char version[256];
872 since.to_string(version, sizeof(version));
873 warning("ignoring option %s; support was removed in %s", stripped_argname, version);
874 return true;
875 }
876 }
877
878 // For locked flags, report a custom error message if available.
879 // Otherwise, report the standard unrecognized VM option.
880 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
881 if (found_flag != NULL) {
882 char locked_message_buf[BUFLEN];
883 found_flag->get_locked_message(locked_message_buf, BUFLEN);
884 if (strlen(locked_message_buf) == 0) {
885 if (found_flag->is_bool() && !has_plus_minus) {
886 jio_fprintf(defaultStream::error_stream(),
887 "Missing +/- setting for VM option '%s'\n", argname);
888 } else if (!found_flag->is_bool() && has_plus_minus) {
889 jio_fprintf(defaultStream::error_stream(),
890 "Unexpected +/- setting in VM option '%s'\n", argname);
891 } else {
892 jio_fprintf(defaultStream::error_stream(),
893 "Improperly specified VM option '%s'\n", argname);
894 }
895 } else {
896 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
897 }
898 } else {
899 jio_fprintf(defaultStream::error_stream(),
900 "Unrecognized VM option '%s'\n", argname);
901 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
902 if (fuzzy_matched != NULL) {
903 jio_fprintf(defaultStream::error_stream(),
904 "Did you mean '%s%s%s'? ",
905 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
906 fuzzy_matched->_name,
907 (fuzzy_matched->is_bool()) ? "" : "=<value>");
908 }
909 }
910
911 // allow for commandline "commenting out" options like -XX:#+Verbose
912 return arg[0] == '#';
913 }
914
915 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
916 FILE* stream = fopen(file_name, "rb");
917 if (stream == NULL) {
918 if (should_exist) {
919 jio_fprintf(defaultStream::error_stream(),
920 "Could not open settings file %s\n", file_name);
921 return false;
922 } else {
923 return true;
924 }
925 }
926
927 char token[1024];
928 int pos = 0;
929
930 bool in_white_space = true;
931 bool in_comment = false;
932 bool in_quote = false;
933 char quote_c = 0;
934 bool result = true;
935
936 int c = getc(stream);
937 while(c != EOF && pos < (int)(sizeof(token)-1)) {
938 if (in_white_space) {
939 if (in_comment) {
940 if (c == '\n') in_comment = false;
941 } else {
942 if (c == '#') in_comment = true;
943 else if (!isspace(c)) {
944 in_white_space = false;
945 token[pos++] = c;
946 }
947 }
948 } else {
949 if (c == '\n' || (!in_quote && isspace(c))) {
950 // token ends at newline, or at unquoted whitespace
951 // this allows a way to include spaces in string-valued options
952 token[pos] = '\0';
953 logOption(token);
954 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
955 build_jvm_flags(token);
956 pos = 0;
957 in_white_space = true;
958 in_quote = false;
959 } else if (!in_quote && (c == '\'' || c == '"')) {
960 in_quote = true;
961 quote_c = c;
962 } else if (in_quote && (c == quote_c)) {
963 in_quote = false;
964 } else {
965 token[pos++] = c;
966 }
967 }
968 c = getc(stream);
969 }
970 if (pos > 0) {
971 token[pos] = '\0';
972 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
973 build_jvm_flags(token);
974 }
975 fclose(stream);
976 return result;
977 }
978
979 //=============================================================================================================
980 // Parsing of properties (-D)
981
982 const char* Arguments::get_property(const char* key) {
983 return PropertyList_get_value(system_properties(), key);
984 }
985
986 bool Arguments::add_property(const char* prop) {
987 const char* eq = strchr(prop, '=');
988 char* key;
989 // ns must be static--its address may be stored in a SystemProperty object.
990 const static char ns[1] = {0};
991 char* value = (char *)ns;
992
993 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
994 key = AllocateHeap(key_len + 1, mtInternal);
995 strncpy(key, prop, key_len);
996 key[key_len] = '\0';
997
998 if (eq != NULL) {
999 size_t value_len = strlen(prop) - key_len - 1;
1000 value = AllocateHeap(value_len + 1, mtInternal);
1001 strncpy(value, &prop[key_len + 1], value_len + 1);
1002 }
1003
1004 if (strcmp(key, "java.compiler") == 0) {
1005 process_java_compiler_argument(value);
1006 FreeHeap(key);
1007 if (eq != NULL) {
1008 FreeHeap(value);
1009 }
1010 return true;
1011 } else if (strcmp(key, "sun.java.command") == 0) {
1012 _java_command = value;
1013
1014 // Record value in Arguments, but let it get passed to Java.
1015 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1016 strcmp(key, "sun.java.launcher.pid") == 0) {
1017 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1018 // private and are processed in process_sun_java_launcher_properties();
1019 // the sun.java.launcher property is passed on to the java application
1020 FreeHeap(key);
1021 if (eq != NULL) {
1022 FreeHeap(value);
1023 }
1024 return true;
1025 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1026 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1027 // its value without going through the property list or making a Java call.
1028 _java_vendor_url_bug = value;
1029 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1030 PropertyList_unique_add(&_system_properties, key, value, true);
1031 return true;
1032 }
1033 // Create new property and add at the end of the list
1034 PropertyList_unique_add(&_system_properties, key, value);
1035 return true;
1036 }
1037
1038 //===========================================================================================================
1039 // Setting int/mixed/comp mode flags
1040
1041 void Arguments::set_mode_flags(Mode mode) {
1042 // Set up default values for all flags.
1043 // If you add a flag to any of the branches below,
1044 // add a default value for it here.
1045 set_java_compiler(false);
1046 _mode = mode;
1047
1048 // Ensure Agent_OnLoad has the correct initial values.
1049 // This may not be the final mode; mode may change later in onload phase.
1050 PropertyList_unique_add(&_system_properties, "java.vm.info",
1051 (char*)VM_Version::vm_info_string(), false);
1052
1053 UseInterpreter = true;
1054 UseCompiler = true;
1055 UseLoopCounter = true;
1056
1057 // Default values may be platform/compiler dependent -
1058 // use the saved values
1059 ClipInlining = Arguments::_ClipInlining;
1060 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1061 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1062 BackgroundCompilation = Arguments::_BackgroundCompilation;
1063 if (TieredCompilation) {
1064 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1065 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1066 }
1067 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1068 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1069 }
1070 }
1071
1072 // Change from defaults based on mode
1073 switch (mode) {
1074 default:
1075 ShouldNotReachHere();
1076 break;
1077 case _int:
1078 UseCompiler = false;
1079 UseLoopCounter = false;
1080 AlwaysCompileLoopMethods = false;
1081 UseOnStackReplacement = false;
1082 break;
1083 case _mixed:
1084 // same as default
1085 break;
1086 case _comp:
1087 UseInterpreter = false;
1088 BackgroundCompilation = false;
1089 ClipInlining = false;
1090 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1091 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1092 // compile a level 4 (C2) and then continue executing it.
1093 if (TieredCompilation) {
1094 Tier3InvokeNotifyFreqLog = 0;
1095 Tier4InvocationThreshold = 0;
1096 }
1097 break;
1098 }
1099 }
1100
1101 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1102 // Conflict: required to use shared spaces (-Xshare:on), but
1103 // incompatible command line options were chosen.
1104
1105 static void no_shared_spaces(const char* message) {
1106 if (RequireSharedSpaces) {
1107 jio_fprintf(defaultStream::error_stream(),
1108 "Class data sharing is inconsistent with other specified options.\n");
1109 vm_exit_during_initialization("Unable to use shared archive.", message);
1110 } else {
1111 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1112 }
1113 }
1114 #endif
1115
1116 // Returns threshold scaled with the value of scale.
1117 // If scale < 0.0, threshold is returned without scaling.
1118 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1119 if (scale == 1.0 || scale < 0.0) {
1120 return threshold;
1121 } else {
1122 return (intx)(threshold * scale);
1123 }
1124 }
1125
1126 // Returns freq_log scaled with the value of scale.
1127 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1128 // If scale < 0.0, freq_log is returned without scaling.
1129 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1130 // Check if scaling is necessary or if negative value was specified.
1131 if (scale == 1.0 || scale < 0.0) {
1132 return freq_log;
1133 }
1134 // Check values to avoid calculating log2 of 0.
1135 if (scale == 0.0 || freq_log == 0) {
1136 return 0;
1137 }
1138 // Determine the maximum notification frequency value currently supported.
1139 // The largest mask value that the interpreter/C1 can handle is
1140 // of length InvocationCounter::number_of_count_bits. Mask values are always
1141 // one bit shorter then the value of the notification frequency. Set
1142 // max_freq_bits accordingly.
1143 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1144 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1145 if (scaled_freq == 0) {
1146 // Return 0 right away to avoid calculating log2 of 0.
1147 return 0;
1148 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1149 return max_freq_bits;
1150 } else {
1151 return log2_intptr(scaled_freq);
1152 }
1153 }
1154
1155 void Arguments::set_tiered_flags() {
1156 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1157 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1158 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1159 }
1160 if (CompilationPolicyChoice < 2) {
1161 vm_exit_during_initialization(
1162 "Incompatible compilation policy selected", NULL);
1163 }
1164 // Increase the code cache size - tiered compiles a lot more.
1165 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1166 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1167 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1168 }
1169 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1170 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1171 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1172
1173 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1174 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1175 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1176 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1177 }
1178 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1179 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1180 }
1181 // Check consistency of code heap sizes
1182 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1183 jio_fprintf(defaultStream::error_stream(),
1184 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1185 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1186 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1187 vm_exit(1);
1188 }
1189 }
1190 }
1191 if (!UseInterpreter) { // -Xcomp
1192 Tier3InvokeNotifyFreqLog = 0;
1193 Tier4InvocationThreshold = 0;
1194 }
1195
1196 if (CompileThresholdScaling < 0) {
1197 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1198 }
1199
1200 // Scale tiered compilation thresholds.
1201 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1202 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1203 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1204 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1205
1206 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1207 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1208 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1209 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1210
1211 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1212 // once these thresholds become supported.
1213
1214 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1215 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1216
1217 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1218 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1219
1220 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1221
1222 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1223 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1224 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1225 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1226 }
1227 }
1228
1229 /**
1230 * Returns the minimum number of compiler threads needed to run the JVM. The following
1231 * configurations are possible.
1232 *
1233 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1234 * compiler threads is 0.
1235 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1236 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1237 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1238 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1239 * C1 can be used, so the minimum number of compiler threads is 1.
1240 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1241 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1242 * the minimum number of compiler threads is 2.
1243 */
1244 int Arguments::get_min_number_of_compiler_threads() {
1245 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1246 return 0; // case 1
1247 #else
1248 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1249 return 1; // case 2 or case 3
1250 }
1251 return 2; // case 4 (tiered)
1252 #endif
1253 }
1254
1255 #if INCLUDE_ALL_GCS
1256 static void disable_adaptive_size_policy(const char* collector_name) {
1257 if (UseAdaptiveSizePolicy) {
1258 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1259 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1260 collector_name);
1261 }
1262 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1263 }
1264 }
1265
1266 void Arguments::set_parnew_gc_flags() {
1267 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1268 "control point invariant");
1269 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1270 assert(UseParNewGC, "ParNew should always be used with CMS");
1271
1272 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1273 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1274 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1275 } else if (ParallelGCThreads == 0) {
1276 jio_fprintf(defaultStream::error_stream(),
1277 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1278 vm_exit(1);
1279 }
1280
1281 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1282 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1283 // we set them to 1024 and 1024.
1284 // See CR 6362902.
1285 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1286 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1287 }
1288 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1289 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1290 }
1291
1292 // When using compressed oops, we use local overflow stacks,
1293 // rather than using a global overflow list chained through
1294 // the klass word of the object's pre-image.
1295 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1296 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1297 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1298 }
1299 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1300 }
1301 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1302 }
1303
1304 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1305 // sparc/solaris for certain applications, but would gain from
1306 // further optimization and tuning efforts, and would almost
1307 // certainly gain from analysis of platform and environment.
1308 void Arguments::set_cms_and_parnew_gc_flags() {
1309 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1310 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1311 assert(UseParNewGC, "ParNew should always be used with CMS");
1312
1313 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1314 disable_adaptive_size_policy("UseConcMarkSweepGC");
1315
1316 set_parnew_gc_flags();
1317
1318 size_t max_heap = align_size_down(MaxHeapSize,
1319 CardTableRS::ct_max_alignment_constraint());
1320
1321 // Now make adjustments for CMS
1322 intx tenuring_default = (intx)6;
1323 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1324
1325 // Preferred young gen size for "short" pauses:
1326 // upper bound depends on # of threads and NewRatio.
1327 const size_t preferred_max_new_size_unaligned =
1328 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1329 size_t preferred_max_new_size =
1330 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1331
1332 // Unless explicitly requested otherwise, size young gen
1333 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1334
1335 // If either MaxNewSize or NewRatio is set on the command line,
1336 // assume the user is trying to set the size of the young gen.
1337 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1338
1339 // Set MaxNewSize to our calculated preferred_max_new_size unless
1340 // NewSize was set on the command line and it is larger than
1341 // preferred_max_new_size.
1342 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1343 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1344 } else {
1345 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1346 }
1347 if (PrintGCDetails && Verbose) {
1348 // Too early to use gclog_or_tty
1349 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1350 }
1351
1352 // Code along this path potentially sets NewSize and OldSize
1353 if (PrintGCDetails && Verbose) {
1354 // Too early to use gclog_or_tty
1355 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1356 " initial_heap_size: " SIZE_FORMAT
1357 " max_heap: " SIZE_FORMAT,
1358 min_heap_size(), InitialHeapSize, max_heap);
1359 }
1360 size_t min_new = preferred_max_new_size;
1361 if (FLAG_IS_CMDLINE(NewSize)) {
1362 min_new = NewSize;
1363 }
1364 if (max_heap > min_new && min_heap_size() > min_new) {
1365 // Unless explicitly requested otherwise, make young gen
1366 // at least min_new, and at most preferred_max_new_size.
1367 if (FLAG_IS_DEFAULT(NewSize)) {
1368 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1369 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1370 if (PrintGCDetails && Verbose) {
1371 // Too early to use gclog_or_tty
1372 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1373 }
1374 }
1375 // Unless explicitly requested otherwise, size old gen
1376 // so it's NewRatio x of NewSize.
1377 if (FLAG_IS_DEFAULT(OldSize)) {
1378 if (max_heap > NewSize) {
1379 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1380 if (PrintGCDetails && Verbose) {
1381 // Too early to use gclog_or_tty
1382 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1383 }
1384 }
1385 }
1386 }
1387 }
1388 // Unless explicitly requested otherwise, definitely
1389 // promote all objects surviving "tenuring_default" scavenges.
1390 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1391 FLAG_IS_DEFAULT(SurvivorRatio)) {
1392 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1393 }
1394 // If we decided above (or user explicitly requested)
1395 // `promote all' (via MaxTenuringThreshold := 0),
1396 // prefer minuscule survivor spaces so as not to waste
1397 // space for (non-existent) survivors
1398 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1399 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1400 }
1401
1402 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1403 // but rather the number of free blocks of a given size that are used when
1404 // replenishing the local per-worker free list caches.
1405 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1406 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1407 // OldPLAB sizing manually turned off: Use a larger default setting,
1408 // unless it was manually specified. This is because a too-low value
1409 // will slow down scavenges.
1410 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1411 } else {
1412 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1413 }
1414 }
1415
1416 // If either of the static initialization defaults have changed, note this
1417 // modification.
1418 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1419 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1420 }
1421
1422 if (!ClassUnloading) {
1423 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1424 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1425 }
1426
1427 if (PrintGCDetails && Verbose) {
1428 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1429 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1430 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1431 }
1432 }
1433 #endif // INCLUDE_ALL_GCS
1434
1435 void set_object_alignment() {
1436 // Object alignment.
1437 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1438 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1439 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1440 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1441 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1442 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1443
1444 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1445 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1446
1447 // Oop encoding heap max
1448 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1449
1450 if (SurvivorAlignmentInBytes == 0) {
1451 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1452 }
1453
1454 #if INCLUDE_ALL_GCS
1455 // Set CMS global values
1456 CompactibleFreeListSpace::set_cms_values();
1457 #endif // INCLUDE_ALL_GCS
1458 }
1459
1460 size_t Arguments::max_heap_for_compressed_oops() {
1461 // Avoid sign flip.
1462 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1463 // We need to fit both the NULL page and the heap into the memory budget, while
1464 // keeping alignment constraints of the heap. To guarantee the latter, as the
1465 // NULL page is located before the heap, we pad the NULL page to the conservative
1466 // maximum alignment that the GC may ever impose upon the heap.
1467 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1468 _conservative_max_heap_alignment);
1469
1470 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1471 NOT_LP64(ShouldNotReachHere(); return 0);
1472 }
1473
1474 bool Arguments::should_auto_select_low_pause_collector() {
1475 if (UseAutoGCSelectPolicy &&
1476 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1477 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1478 if (PrintGCDetails) {
1479 // Cannot use gclog_or_tty yet.
1480 tty->print_cr("Automatic selection of the low pause collector"
1481 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1482 }
1483 return true;
1484 }
1485 return false;
1486 }
1487
1488 void Arguments::set_use_compressed_oops() {
1489 #ifndef ZERO
1490 #ifdef _LP64
1491 // MaxHeapSize is not set up properly at this point, but
1492 // the only value that can override MaxHeapSize if we are
1493 // to use UseCompressedOops is InitialHeapSize.
1494 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1495
1496 if (max_heap_size <= max_heap_for_compressed_oops()) {
1497 #if !defined(COMPILER1) || defined(TIERED)
1498 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1499 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1500 }
1501 #endif
1502 } else {
1503 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1504 warning("Max heap size too large for Compressed Oops");
1505 FLAG_SET_DEFAULT(UseCompressedOops, false);
1506 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1507 }
1508 }
1509 #endif // _LP64
1510 #endif // ZERO
1511 }
1512
1513
1514 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1515 // set_use_compressed_oops().
1516 void Arguments::set_use_compressed_klass_ptrs() {
1517 #ifndef ZERO
1518 #ifdef _LP64
1519 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1520 if (!UseCompressedOops) {
1521 if (UseCompressedClassPointers) {
1522 warning("UseCompressedClassPointers requires UseCompressedOops");
1523 }
1524 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1525 } else {
1526 // Turn on UseCompressedClassPointers too
1527 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1528 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1529 }
1530 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1531 if (UseCompressedClassPointers) {
1532 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1533 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1534 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1535 }
1536 }
1537 }
1538 #endif // _LP64
1539 #endif // !ZERO
1540 }
1541
1542 void Arguments::set_conservative_max_heap_alignment() {
1543 // The conservative maximum required alignment for the heap is the maximum of
1544 // the alignments imposed by several sources: any requirements from the heap
1545 // itself, the collector policy and the maximum page size we may run the VM
1546 // with.
1547 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1548 #if INCLUDE_ALL_GCS
1549 if (UseParallelGC) {
1550 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1551 } else if (UseG1GC) {
1552 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1553 }
1554 #endif // INCLUDE_ALL_GCS
1555 _conservative_max_heap_alignment = MAX4(heap_alignment,
1556 (size_t)os::vm_allocation_granularity(),
1557 os::max_page_size(),
1558 CollectorPolicy::compute_heap_alignment());
1559 }
1560
1561 void Arguments::select_gc_ergonomically() {
1562 if (os::is_server_class_machine()) {
1563 if (should_auto_select_low_pause_collector()) {
1564 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1565 } else {
1566 #if defined(JAVASE_EMBEDDED)
1567 FLAG_SET_ERGO(bool, UseParallelGC, true);
1568 #else
1569 FLAG_SET_ERGO(bool, UseG1GC, true);
1570 #endif
1571 }
1572 } else {
1573 FLAG_SET_ERGO(bool, UseSerialGC, true);
1574 }
1575 }
1576
1577 void Arguments::select_gc() {
1578 if (!gc_selected()) {
1579 select_gc_ergonomically();
1580 guarantee(gc_selected(), "No GC selected");
1581 }
1582 }
1583
1584 void Arguments::set_ergonomics_flags() {
1585 select_gc();
1586
1587 #ifdef COMPILER2
1588 // Shared spaces work fine with other GCs but causes bytecode rewriting
1589 // to be disabled, which hurts interpreter performance and decreases
1590 // server performance. When -server is specified, keep the default off
1591 // unless it is asked for. Future work: either add bytecode rewriting
1592 // at link time, or rewrite bytecodes in non-shared methods.
1593 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1594 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1595 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1596 }
1597 #endif
1598
1599 set_conservative_max_heap_alignment();
1600
1601 #ifndef ZERO
1602 #ifdef _LP64
1603 set_use_compressed_oops();
1604
1605 // set_use_compressed_klass_ptrs() must be called after calling
1606 // set_use_compressed_oops().
1607 set_use_compressed_klass_ptrs();
1608
1609 // Also checks that certain machines are slower with compressed oops
1610 // in vm_version initialization code.
1611 #endif // _LP64
1612 #endif // !ZERO
1613
1614 // Set up runtime image flags.
1615 set_runtime_image_flags();
1616
1617 CodeCacheExtensions::set_ergonomics_flags();
1618 }
1619
1620 void Arguments::set_parallel_gc_flags() {
1621 assert(UseParallelGC || UseParallelOldGC, "Error");
1622 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1623 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1624 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1625 }
1626 FLAG_SET_DEFAULT(UseParallelGC, true);
1627
1628 // If no heap maximum was requested explicitly, use some reasonable fraction
1629 // of the physical memory, up to a maximum of 1GB.
1630 FLAG_SET_DEFAULT(ParallelGCThreads,
1631 Abstract_VM_Version::parallel_worker_threads());
1632 if (ParallelGCThreads == 0) {
1633 jio_fprintf(defaultStream::error_stream(),
1634 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1635 vm_exit(1);
1636 }
1637
1638 if (UseAdaptiveSizePolicy) {
1639 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1640 // unless the user actually sets these flags.
1641 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1642 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1643 _min_heap_free_ratio = MinHeapFreeRatio;
1644 }
1645 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1646 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1647 _max_heap_free_ratio = MaxHeapFreeRatio;
1648 }
1649 }
1650
1651 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1652 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1653 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1654 // See CR 6362902 for details.
1655 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1656 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1657 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1658 }
1659 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1660 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1661 }
1662 }
1663
1664 if (UseParallelOldGC) {
1665 // Par compact uses lower default values since they are treated as
1666 // minimums. These are different defaults because of the different
1667 // interpretation and are not ergonomically set.
1668 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1669 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1670 }
1671 }
1672 }
1673
1674 void Arguments::set_g1_gc_flags() {
1675 assert(UseG1GC, "Error");
1676 #ifdef COMPILER1
1677 FastTLABRefill = false;
1678 #endif
1679 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1680 if (ParallelGCThreads == 0) {
1681 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1682 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1683 }
1684
1685 #if INCLUDE_ALL_GCS
1686 if (G1ConcRefinementThreads == 0) {
1687 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1688 }
1689 #endif
1690
1691 // MarkStackSize will be set (if it hasn't been set by the user)
1692 // when concurrent marking is initialized.
1693 // Its value will be based upon the number of parallel marking threads.
1694 // But we do set the maximum mark stack size here.
1695 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1696 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1697 }
1698
1699 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1700 // In G1, we want the default GC overhead goal to be higher than
1701 // say in PS. So we set it here to 10%. Otherwise the heap might
1702 // be expanded more aggressively than we would like it to. In
1703 // fact, even 10% seems to not be high enough in some cases
1704 // (especially small GC stress tests that the main thing they do
1705 // is allocation). We might consider increase it further.
1706 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1707 }
1708
1709 if (PrintGCDetails && Verbose) {
1710 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1711 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1712 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1713 }
1714 }
1715
1716 #if !INCLUDE_ALL_GCS
1717 #ifdef ASSERT
1718 static bool verify_serial_gc_flags() {
1719 return (UseSerialGC &&
1720 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1721 UseParallelGC || UseParallelOldGC));
1722 }
1723 #endif // ASSERT
1724 #endif // INCLUDE_ALL_GCS
1725
1726 void Arguments::set_gc_specific_flags() {
1727 #if INCLUDE_ALL_GCS
1728 // Set per-collector flags
1729 if (UseParallelGC || UseParallelOldGC) {
1730 set_parallel_gc_flags();
1731 } else if (UseConcMarkSweepGC) {
1732 set_cms_and_parnew_gc_flags();
1733 } else if (UseG1GC) {
1734 set_g1_gc_flags();
1735 }
1736 check_deprecated_gc_flags();
1737 if (AssumeMP && !UseSerialGC) {
1738 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1739 warning("If the number of processors is expected to increase from one, then"
1740 " you should configure the number of parallel GC threads appropriately"
1741 " using -XX:ParallelGCThreads=N");
1742 }
1743 }
1744 if (MinHeapFreeRatio == 100) {
1745 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1746 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1747 }
1748 #else // INCLUDE_ALL_GCS
1749 assert(verify_serial_gc_flags(), "SerialGC unset");
1750 #endif // INCLUDE_ALL_GCS
1751 }
1752
1753 julong Arguments::limit_by_allocatable_memory(julong limit) {
1754 julong max_allocatable;
1755 julong result = limit;
1756 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1757 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1758 }
1759 return result;
1760 }
1761
1762 // Use static initialization to get the default before parsing
1763 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1764
1765 void Arguments::set_heap_size() {
1766 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1767 // Deprecated flag
1768 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1769 }
1770
1771 const julong phys_mem =
1772 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1773 : (julong)MaxRAM;
1774
1775 // If the maximum heap size has not been set with -Xmx,
1776 // then set it as fraction of the size of physical memory,
1777 // respecting the maximum and minimum sizes of the heap.
1778 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1779 julong reasonable_max = phys_mem / MaxRAMFraction;
1780
1781 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1782 // Small physical memory, so use a minimum fraction of it for the heap
1783 reasonable_max = phys_mem / MinRAMFraction;
1784 } else {
1785 // Not-small physical memory, so require a heap at least
1786 // as large as MaxHeapSize
1787 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1788 }
1789 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1790 // Limit the heap size to ErgoHeapSizeLimit
1791 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1792 }
1793 if (UseCompressedOops) {
1794 // Limit the heap size to the maximum possible when using compressed oops
1795 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1796
1797 // HeapBaseMinAddress can be greater than default but not less than.
1798 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1799 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1800 // matches compressed oops printing flags
1801 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1802 jio_fprintf(defaultStream::error_stream(),
1803 "HeapBaseMinAddress must be at least " SIZE_FORMAT
1804 " (" SIZE_FORMAT "G) which is greater than value given "
1805 SIZE_FORMAT "\n",
1806 DefaultHeapBaseMinAddress,
1807 DefaultHeapBaseMinAddress/G,
1808 HeapBaseMinAddress);
1809 }
1810 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1811 }
1812 }
1813
1814 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1815 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1816 // but it should be not less than default MaxHeapSize.
1817 max_coop_heap -= HeapBaseMinAddress;
1818 }
1819 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1820 }
1821 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1822
1823 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1824 // An initial heap size was specified on the command line,
1825 // so be sure that the maximum size is consistent. Done
1826 // after call to limit_by_allocatable_memory because that
1827 // method might reduce the allocation size.
1828 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1829 }
1830
1831 if (PrintGCDetails && Verbose) {
1832 // Cannot use gclog_or_tty yet.
1833 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1834 }
1835 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1836 }
1837
1838 // If the minimum or initial heap_size have not been set or requested to be set
1839 // ergonomically, set them accordingly.
1840 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1841 julong reasonable_minimum = (julong)(OldSize + NewSize);
1842
1843 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1844
1845 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1846
1847 if (InitialHeapSize == 0) {
1848 julong reasonable_initial = phys_mem / InitialRAMFraction;
1849
1850 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1851 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1852
1853 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1854
1855 if (PrintGCDetails && Verbose) {
1856 // Cannot use gclog_or_tty yet.
1857 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1858 }
1859 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1860 }
1861 // If the minimum heap size has not been set (via -Xms),
1862 // synchronize with InitialHeapSize to avoid errors with the default value.
1863 if (min_heap_size() == 0) {
1864 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1865 if (PrintGCDetails && Verbose) {
1866 // Cannot use gclog_or_tty yet.
1867 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1868 }
1869 }
1870 }
1871 }
1872
1873 // Set up runtime image flags
1874 void Arguments::set_runtime_image_flags() {
1875 #ifdef _LP64
1876 // Memory map image file by default on 64 bit machines.
1877 if (FLAG_IS_DEFAULT(MemoryMapImage)) {
1878 FLAG_SET_ERGO(bool, MemoryMapImage, true);
1879 }
1880 #endif
1881 }
1882
1883 // This must be called after ergonomics.
1884 void Arguments::set_bytecode_flags() {
1885 if (!RewriteBytecodes) {
1886 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1887 }
1888 }
1889
1890 // Aggressive optimization flags -XX:+AggressiveOpts
1891 void Arguments::set_aggressive_opts_flags() {
1892 #ifdef COMPILER2
1893 if (AggressiveUnboxing) {
1894 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1895 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1896 } else if (!EliminateAutoBox) {
1897 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1898 AggressiveUnboxing = false;
1899 }
1900 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1901 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1902 } else if (!DoEscapeAnalysis) {
1903 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1904 AggressiveUnboxing = false;
1905 }
1906 }
1907 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1908 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1909 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1910 }
1911 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1912 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1913 }
1914
1915 // Feed the cache size setting into the JDK
1916 char buffer[1024];
1917 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1918 add_property(buffer);
1919 }
1920 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1921 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1922 }
1923 #endif
1924
1925 if (AggressiveOpts) {
1926 // Sample flag setting code
1927 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1928 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1929 // }
1930 }
1931 }
1932
1933 //===========================================================================================================
1934 // Parsing of java.compiler property
1935
1936 void Arguments::process_java_compiler_argument(char* arg) {
1937 // For backwards compatibility, Djava.compiler=NONE or ""
1938 // causes us to switch to -Xint mode UNLESS -Xdebug
1939 // is also specified.
1940 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1941 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1942 }
1943 }
1944
1945 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1946 _sun_java_launcher = os::strdup_check_oom(launcher);
1947 }
1948
1949 bool Arguments::created_by_java_launcher() {
1950 assert(_sun_java_launcher != NULL, "property must have value");
1951 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1952 }
1953
1954 bool Arguments::sun_java_launcher_is_altjvm() {
1955 return _sun_java_launcher_is_altjvm;
1956 }
1957
1958 //===========================================================================================================
1959 // Parsing of main arguments
1960
1961 // check if do gclog rotation
1962 // +UseGCLogFileRotation is a must,
1963 // no gc log rotation when log file not supplied or
1964 // NumberOfGCLogFiles is 0
1965 void check_gclog_consistency() {
1966 if (UseGCLogFileRotation) {
1967 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1968 jio_fprintf(defaultStream::output_stream(),
1969 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1970 "where num_of_file > 0\n"
1971 "GC log rotation is turned off\n");
1972 UseGCLogFileRotation = false;
1973 }
1974 }
1975
1976 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1977 if (FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K) == Flag::SUCCESS) {
1978 jio_fprintf(defaultStream::output_stream(),
1979 "GCLogFileSize changed to minimum 8K\n");
1980 }
1981 }
1982 }
1983
1984 // This function is called for -Xloggc:<filename>, it can be used
1985 // to check if a given file name(or string) conforms to the following
1986 // specification:
1987 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1988 // %p and %t only allowed once. We only limit usage of filename not path
1989 bool is_filename_valid(const char *file_name) {
1990 const char* p = file_name;
1991 char file_sep = os::file_separator()[0];
1992 const char* cp;
1993 // skip prefix path
1994 for (cp = file_name; *cp != '\0'; cp++) {
1995 if (*cp == '/' || *cp == file_sep) {
1996 p = cp + 1;
1997 }
1998 }
1999
2000 int count_p = 0;
2001 int count_t = 0;
2002 while (*p != '\0') {
2003 if ((*p >= '0' && *p <= '9') ||
2004 (*p >= 'A' && *p <= 'Z') ||
2005 (*p >= 'a' && *p <= 'z') ||
2006 *p == '-' ||
2007 *p == '_' ||
2008 *p == '.') {
2009 p++;
2010 continue;
2011 }
2012 if (*p == '%') {
2013 if(*(p + 1) == 'p') {
2014 p += 2;
2015 count_p ++;
2016 continue;
2017 }
2018 if (*(p + 1) == 't') {
2019 p += 2;
2020 count_t ++;
2021 continue;
2022 }
2023 }
2024 return false;
2025 }
2026 return count_p < 2 && count_t < 2;
2027 }
2028
2029 // Check consistency of GC selection
2030 bool Arguments::check_gc_consistency() {
2031 check_gclog_consistency();
2032 // Ensure that the user has not selected conflicting sets
2033 // of collectors.
2034 uint i = 0;
2035 if (UseSerialGC) i++;
2036 if (UseConcMarkSweepGC) i++;
2037 if (UseParallelGC || UseParallelOldGC) i++;
2038 if (UseG1GC) i++;
2039 if (i > 1) {
2040 jio_fprintf(defaultStream::error_stream(),
2041 "Conflicting collector combinations in option list; "
2042 "please refer to the release notes for the combinations "
2043 "allowed\n");
2044 return false;
2045 }
2046
2047 if (UseConcMarkSweepGC && !UseParNewGC) {
2048 jio_fprintf(defaultStream::error_stream(),
2049 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2050 return false;
2051 }
2052
2053 if (UseParNewGC && !UseConcMarkSweepGC) {
2054 jio_fprintf(defaultStream::error_stream(),
2055 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2056 return false;
2057 }
2058
2059 return true;
2060 }
2061
2062 void Arguments::check_deprecated_gc_flags() {
2063 if (FLAG_IS_CMDLINE(UseParNewGC)) {
2064 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2065 }
2066 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2067 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2068 "and will likely be removed in future release");
2069 }
2070 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2071 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2072 "Use MaxRAMFraction instead.");
2073 }
2074 }
2075
2076 // Check the consistency of vm_init_args
2077 bool Arguments::check_vm_args_consistency() {
2078 // Method for adding checks for flag consistency.
2079 // The intent is to warn the user of all possible conflicts,
2080 // before returning an error.
2081 // Note: Needs platform-dependent factoring.
2082 bool status = true;
2083
2084 if (TLABRefillWasteFraction == 0) {
2085 jio_fprintf(defaultStream::error_stream(),
2086 "TLABRefillWasteFraction should be a denominator, "
2087 "not " SIZE_FORMAT "\n",
2088 TLABRefillWasteFraction);
2089 status = false;
2090 }
2091
2092 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2093 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2094 }
2095
2096 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2097 // Settings to encourage splitting.
2098 if (!FLAG_IS_CMDLINE(NewRatio)) {
2099 if (FLAG_SET_CMDLINE(uintx, NewRatio, 2) != Flag::SUCCESS) {
2100 status = false;
2101 }
2102 }
2103 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2104 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2105 status = false;
2106 }
2107 }
2108 }
2109
2110 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2111 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2112 }
2113
2114 if (GCTimeLimit == 100) {
2115 // Turn off gc-overhead-limit-exceeded checks
2116 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2117 }
2118
2119 status = status && check_gc_consistency();
2120
2121 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2122 // insists that we hold the requisite locks so that the iteration is
2123 // MT-safe. For the verification at start-up and shut-down, we don't
2124 // yet have a good way of acquiring and releasing these locks,
2125 // which are not visible at the CollectedHeap level. We want to
2126 // be able to acquire these locks and then do the iteration rather
2127 // than just disable the lock verification. This will be fixed under
2128 // bug 4788986.
2129 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2130 if (VerifyDuringStartup) {
2131 warning("Heap verification at start-up disabled "
2132 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2133 VerifyDuringStartup = false; // Disable verification at start-up
2134 }
2135
2136 if (VerifyBeforeExit) {
2137 warning("Heap verification at shutdown disabled "
2138 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2139 VerifyBeforeExit = false; // Disable verification at shutdown
2140 }
2141 }
2142
2143 // Note: only executed in non-PRODUCT mode
2144 if (!UseAsyncConcMarkSweepGC &&
2145 (ExplicitGCInvokesConcurrent ||
2146 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2147 jio_fprintf(defaultStream::error_stream(),
2148 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2149 " with -UseAsyncConcMarkSweepGC");
2150 status = false;
2151 }
2152
2153 if (PrintNMTStatistics) {
2154 #if INCLUDE_NMT
2155 if (MemTracker::tracking_level() == NMT_off) {
2156 #endif // INCLUDE_NMT
2157 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2158 PrintNMTStatistics = false;
2159 #if INCLUDE_NMT
2160 }
2161 #endif
2162 }
2163
2164 // Check lower bounds of the code cache
2165 // Template Interpreter code is approximately 3X larger in debug builds.
2166 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2167 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2168 jio_fprintf(defaultStream::error_stream(),
2169 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2170 os::vm_page_size()/K);
2171 status = false;
2172 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2173 jio_fprintf(defaultStream::error_stream(),
2174 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2175 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2176 status = false;
2177 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2178 jio_fprintf(defaultStream::error_stream(),
2179 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2180 min_code_cache_size/K);
2181 status = false;
2182 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2183 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2184 jio_fprintf(defaultStream::error_stream(),
2185 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2186 CODE_CACHE_SIZE_LIMIT/M);
2187 status = false;
2188 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2189 jio_fprintf(defaultStream::error_stream(),
2190 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2191 min_code_cache_size/K);
2192 status = false;
2193 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2194 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2195 jio_fprintf(defaultStream::error_stream(),
2196 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2197 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2198 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2199 status = false;
2200 }
2201
2202 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2203 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2204 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2205
2206 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2207 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2208 }
2209
2210 return status;
2211 }
2212
2213 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2214 const char* option_type) {
2215 if (ignore) return false;
2216
2217 const char* spacer = " ";
2218 if (option_type == NULL) {
2219 option_type = ++spacer; // Set both to the empty string.
2220 }
2221
2222 if (os::obsolete_option(option)) {
2223 jio_fprintf(defaultStream::error_stream(),
2224 "Obsolete %s%soption: %s\n", option_type, spacer,
2225 option->optionString);
2226 return false;
2227 } else {
2228 jio_fprintf(defaultStream::error_stream(),
2229 "Unrecognized %s%soption: %s\n", option_type, spacer,
2230 option->optionString);
2231 return true;
2232 }
2233 }
2234
2235 static const char* user_assertion_options[] = {
2236 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2237 };
2238
2239 static const char* system_assertion_options[] = {
2240 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2241 };
2242
2243 bool Arguments::parse_uintx(const char* value,
2244 uintx* uintx_arg,
2245 uintx min_size) {
2246
2247 // Check the sign first since atomull() parses only unsigned values.
2248 bool value_is_positive = !(*value == '-');
2249
2250 if (value_is_positive) {
2251 julong n;
2252 bool good_return = atomull(value, &n);
2253 if (good_return) {
2254 bool above_minimum = n >= min_size;
2255 bool value_is_too_large = n > max_uintx;
2256
2257 if (above_minimum && !value_is_too_large) {
2258 *uintx_arg = n;
2259 return true;
2260 }
2261 }
2262 }
2263 return false;
2264 }
2265
2266 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2267 julong* long_arg,
2268 julong min_size) {
2269 if (!atomull(s, long_arg)) return arg_unreadable;
2270 return check_memory_size(*long_arg, min_size);
2271 }
2272
2273 // Parse JavaVMInitArgs structure
2274
2275 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2276 const JavaVMInitArgs *java_options_args,
2277 const JavaVMInitArgs *cmd_line_args) {
2278 // For components of the system classpath.
2279 SysClassPath scp(Arguments::get_sysclasspath());
2280 bool scp_assembly_required = false;
2281
2282 // Save default settings for some mode flags
2283 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2284 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2285 Arguments::_ClipInlining = ClipInlining;
2286 Arguments::_BackgroundCompilation = BackgroundCompilation;
2287 if (TieredCompilation) {
2288 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2289 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2290 }
2291
2292 // Setup flags for mixed which is the default
2293 set_mode_flags(_mixed);
2294
2295 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2296 // variable (if present).
2297 jint result = parse_each_vm_init_arg(
2298 java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2299 if (result != JNI_OK) {
2300 return result;
2301 }
2302
2303 // Parse args structure generated from the command line flags.
2304 result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required,
2305 Flag::COMMAND_LINE);
2306 if (result != JNI_OK) {
2307 return result;
2308 }
2309
2310 // Parse args structure generated from the _JAVA_OPTIONS environment
2311 // variable (if present) (mimics classic VM)
2312 result = parse_each_vm_init_arg(
2313 java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2314 if (result != JNI_OK) {
2315 return result;
2316 }
2317
2318 // Do final processing now that all arguments have been parsed
2319 result = finalize_vm_init_args(&scp, scp_assembly_required);
2320 if (result != JNI_OK) {
2321 return result;
2322 }
2323
2324 return JNI_OK;
2325 }
2326
2327 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2328 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2329 // are dealing with -agentpath (case where name is a path), otherwise with
2330 // -agentlib
2331 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2332 char *_name;
2333 const char *_hprof = "hprof", *_jdwp = "jdwp";
2334 size_t _len_hprof, _len_jdwp, _len_prefix;
2335
2336 if (is_path) {
2337 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2338 return false;
2339 }
2340
2341 _name++; // skip past last path separator
2342 _len_prefix = strlen(JNI_LIB_PREFIX);
2343
2344 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2345 return false;
2346 }
2347
2348 _name += _len_prefix;
2349 _len_hprof = strlen(_hprof);
2350 _len_jdwp = strlen(_jdwp);
2351
2352 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2353 _name += _len_hprof;
2354 }
2355 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2356 _name += _len_jdwp;
2357 }
2358 else {
2359 return false;
2360 }
2361
2362 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2363 return false;
2364 }
2365
2366 return true;
2367 }
2368
2369 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2370 return true;
2371 }
2372
2373 return false;
2374 }
2375
2376 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2377 SysClassPath* scp_p,
2378 bool* scp_assembly_required_p,
2379 Flag::Flags origin) {
2380 // Remaining part of option string
2381 const char* tail;
2382
2383 // iterate over arguments
2384 for (int index = 0; index < args->nOptions; index++) {
2385 bool is_absolute_path = false; // for -agentpath vs -agentlib
2386
2387 const JavaVMOption* option = args->options + index;
2388
2389 if (!match_option(option, "-Djava.class.path", &tail) &&
2390 !match_option(option, "-Dsun.java.command", &tail) &&
2391 !match_option(option, "-Dsun.java.launcher", &tail)) {
2392
2393 // add all jvm options to the jvm_args string. This string
2394 // is used later to set the java.vm.args PerfData string constant.
2395 // the -Djava.class.path and the -Dsun.java.command options are
2396 // omitted from jvm_args string as each have their own PerfData
2397 // string constant object.
2398 build_jvm_args(option->optionString);
2399 }
2400
2401 // -verbose:[class/gc/jni]
2402 if (match_option(option, "-verbose", &tail)) {
2403 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2404 if (FLAG_SET_CMDLINE(bool, TraceClassLoading, true) != Flag::SUCCESS) {
2405 return JNI_EINVAL;
2406 }
2407 if (FLAG_SET_CMDLINE(bool, TraceClassUnloading, true) != Flag::SUCCESS) {
2408 return JNI_EINVAL;
2409 }
2410 } else if (!strcmp(tail, ":gc")) {
2411 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
2412 return JNI_EINVAL;
2413 }
2414 } else if (!strcmp(tail, ":jni")) {
2415 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2416 return JNI_EINVAL;
2417 }
2418 }
2419 // -da / -ea / -disableassertions / -enableassertions
2420 // These accept an optional class/package name separated by a colon, e.g.,
2421 // -da:java.lang.Thread.
2422 } else if (match_option(option, user_assertion_options, &tail, true)) {
2423 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2424 if (*tail == '\0') {
2425 JavaAssertions::setUserClassDefault(enable);
2426 } else {
2427 assert(*tail == ':', "bogus match by match_option()");
2428 JavaAssertions::addOption(tail + 1, enable);
2429 }
2430 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2431 } else if (match_option(option, system_assertion_options, &tail, false)) {
2432 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2433 JavaAssertions::setSystemClassDefault(enable);
2434 // -bootclasspath:
2435 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2436 scp_p->reset_path(tail);
2437 *scp_assembly_required_p = true;
2438 // -bootclasspath/a:
2439 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2440 scp_p->add_suffix(tail);
2441 *scp_assembly_required_p = true;
2442 // -bootclasspath/p:
2443 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2444 scp_p->add_prefix(tail);
2445 *scp_assembly_required_p = true;
2446 // -Xrun
2447 } else if (match_option(option, "-Xrun", &tail)) {
2448 if (tail != NULL) {
2449 const char* pos = strchr(tail, ':');
2450 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2451 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2452 name[len] = '\0';
2453
2454 char *options = NULL;
2455 if(pos != NULL) {
2456 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2457 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2458 }
2459 #if !INCLUDE_JVMTI
2460 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2461 jio_fprintf(defaultStream::error_stream(),
2462 "Profiling and debugging agents are not supported in this VM\n");
2463 return JNI_ERR;
2464 }
2465 #endif // !INCLUDE_JVMTI
2466 add_init_library(name, options);
2467 }
2468 // -agentlib and -agentpath
2469 } else if (match_option(option, "-agentlib:", &tail) ||
2470 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2471 if(tail != NULL) {
2472 const char* pos = strchr(tail, '=');
2473 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2474 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2475 name[len] = '\0';
2476
2477 char *options = NULL;
2478 if(pos != NULL) {
2479 options = os::strdup_check_oom(pos + 1, mtInternal);
2480 }
2481 #if !INCLUDE_JVMTI
2482 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2483 jio_fprintf(defaultStream::error_stream(),
2484 "Profiling and debugging agents are not supported in this VM\n");
2485 return JNI_ERR;
2486 }
2487 #endif // !INCLUDE_JVMTI
2488 add_init_agent(name, options, is_absolute_path);
2489 }
2490 // -javaagent
2491 } else if (match_option(option, "-javaagent:", &tail)) {
2492 #if !INCLUDE_JVMTI
2493 jio_fprintf(defaultStream::error_stream(),
2494 "Instrumentation agents are not supported in this VM\n");
2495 return JNI_ERR;
2496 #else
2497 if(tail != NULL) {
2498 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2499 add_init_agent("instrument", options, false);
2500 }
2501 #endif // !INCLUDE_JVMTI
2502 // -Xnoclassgc
2503 } else if (match_option(option, "-Xnoclassgc")) {
2504 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2505 return JNI_EINVAL;
2506 }
2507 // -Xconcgc
2508 } else if (match_option(option, "-Xconcgc")) {
2509 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2510 return JNI_EINVAL;
2511 }
2512 // -Xnoconcgc
2513 } else if (match_option(option, "-Xnoconcgc")) {
2514 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2515 return JNI_EINVAL;
2516 }
2517 // -Xbatch
2518 } else if (match_option(option, "-Xbatch")) {
2519 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2520 return JNI_EINVAL;
2521 }
2522 // -Xmn for compatibility with other JVM vendors
2523 } else if (match_option(option, "-Xmn", &tail)) {
2524 julong long_initial_young_size = 0;
2525 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2526 if (errcode != arg_in_range) {
2527 jio_fprintf(defaultStream::error_stream(),
2528 "Invalid initial young generation size: %s\n", option->optionString);
2529 describe_range_error(errcode);
2530 return JNI_EINVAL;
2531 }
2532 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2533 return JNI_EINVAL;
2534 }
2535 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2536 return JNI_EINVAL;
2537 }
2538 // -Xms
2539 } else if (match_option(option, "-Xms", &tail)) {
2540 julong long_initial_heap_size = 0;
2541 // an initial heap size of 0 means automatically determine
2542 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2543 if (errcode != arg_in_range) {
2544 jio_fprintf(defaultStream::error_stream(),
2545 "Invalid initial heap size: %s\n", option->optionString);
2546 describe_range_error(errcode);
2547 return JNI_EINVAL;
2548 }
2549 set_min_heap_size((size_t)long_initial_heap_size);
2550 // Currently the minimum size and the initial heap sizes are the same.
2551 // Can be overridden with -XX:InitialHeapSize.
2552 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2553 return JNI_EINVAL;
2554 }
2555 // -Xmx
2556 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2557 julong long_max_heap_size = 0;
2558 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2559 if (errcode != arg_in_range) {
2560 jio_fprintf(defaultStream::error_stream(),
2561 "Invalid maximum heap size: %s\n", option->optionString);
2562 describe_range_error(errcode);
2563 return JNI_EINVAL;
2564 }
2565 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2566 return JNI_EINVAL;
2567 }
2568 // Xmaxf
2569 } else if (match_option(option, "-Xmaxf", &tail)) {
2570 char* err;
2571 int maxf = (int)(strtod(tail, &err) * 100);
2572 if (*err != '\0' || *tail == '\0') {
2573 jio_fprintf(defaultStream::error_stream(),
2574 "Bad max heap free percentage size: %s\n",
2575 option->optionString);
2576 return JNI_EINVAL;
2577 } else {
2578 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2579 return JNI_EINVAL;
2580 }
2581 }
2582 // Xminf
2583 } else if (match_option(option, "-Xminf", &tail)) {
2584 char* err;
2585 int minf = (int)(strtod(tail, &err) * 100);
2586 if (*err != '\0' || *tail == '\0') {
2587 jio_fprintf(defaultStream::error_stream(),
2588 "Bad min heap free percentage size: %s\n",
2589 option->optionString);
2590 return JNI_EINVAL;
2591 } else {
2592 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2593 return JNI_EINVAL;
2594 }
2595 }
2596 // -Xss
2597 } else if (match_option(option, "-Xss", &tail)) {
2598 julong long_ThreadStackSize = 0;
2599 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2600 if (errcode != arg_in_range) {
2601 jio_fprintf(defaultStream::error_stream(),
2602 "Invalid thread stack size: %s\n", option->optionString);
2603 describe_range_error(errcode);
2604 return JNI_EINVAL;
2605 }
2606 // Internally track ThreadStackSize in units of 1024 bytes.
2607 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2608 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2609 return JNI_EINVAL;
2610 }
2611 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads
2612 } else if (match_option(option, "-Xoss", &tail) ||
2613 match_option(option, "-Xsqnopause") ||
2614 match_option(option, "-Xoptimize") ||
2615 match_option(option, "-Xboundthreads")) {
2616 // All these options are deprecated in JDK 9 and will be removed in a future release
2617 char version[256];
2618 JDK_Version::jdk(9).to_string(version, sizeof(version));
2619 warning("ignoring option %s; support was removed in %s", option->optionString, version);
2620 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2621 julong long_CodeCacheExpansionSize = 0;
2622 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2623 if (errcode != arg_in_range) {
2624 jio_fprintf(defaultStream::error_stream(),
2625 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2626 os::vm_page_size()/K);
2627 return JNI_EINVAL;
2628 }
2629 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2630 return JNI_EINVAL;
2631 }
2632 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2633 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2634 julong long_ReservedCodeCacheSize = 0;
2635
2636 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2637 if (errcode != arg_in_range) {
2638 jio_fprintf(defaultStream::error_stream(),
2639 "Invalid maximum code cache size: %s.\n", option->optionString);
2640 return JNI_EINVAL;
2641 }
2642 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2643 return JNI_EINVAL;
2644 }
2645 // -XX:NonNMethodCodeHeapSize=
2646 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2647 julong long_NonNMethodCodeHeapSize = 0;
2648
2649 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2650 if (errcode != arg_in_range) {
2651 jio_fprintf(defaultStream::error_stream(),
2652 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2653 return JNI_EINVAL;
2654 }
2655 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2656 return JNI_EINVAL;
2657 }
2658 // -XX:ProfiledCodeHeapSize=
2659 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2660 julong long_ProfiledCodeHeapSize = 0;
2661
2662 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2663 if (errcode != arg_in_range) {
2664 jio_fprintf(defaultStream::error_stream(),
2665 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2666 return JNI_EINVAL;
2667 }
2668 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
2669 return JNI_EINVAL;
2670 }
2671 // -XX:NonProfiledCodeHeapSizee=
2672 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2673 julong long_NonProfiledCodeHeapSize = 0;
2674
2675 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2676 if (errcode != arg_in_range) {
2677 jio_fprintf(defaultStream::error_stream(),
2678 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2679 return JNI_EINVAL;
2680 }
2681 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
2682 return JNI_EINVAL;
2683 }
2684 // -green
2685 } else if (match_option(option, "-green")) {
2686 jio_fprintf(defaultStream::error_stream(),
2687 "Green threads support not available\n");
2688 return JNI_EINVAL;
2689 // -native
2690 } else if (match_option(option, "-native")) {
2691 // HotSpot always uses native threads, ignore silently for compatibility
2692 // -Xrs
2693 } else if (match_option(option, "-Xrs")) {
2694 // Classic/EVM option, new functionality
2695 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2696 return JNI_EINVAL;
2697 }
2698 } else if (match_option(option, "-Xusealtsigs")) {
2699 // change default internal VM signals used - lower case for back compat
2700 if (FLAG_SET_CMDLINE(bool, UseAltSigs, true) != Flag::SUCCESS) {
2701 return JNI_EINVAL;
2702 }
2703 // -Xprof
2704 } else if (match_option(option, "-Xprof")) {
2705 #if INCLUDE_FPROF
2706 _has_profile = true;
2707 #else // INCLUDE_FPROF
2708 jio_fprintf(defaultStream::error_stream(),
2709 "Flat profiling is not supported in this VM.\n");
2710 return JNI_ERR;
2711 #endif // INCLUDE_FPROF
2712 // -Xconcurrentio
2713 } else if (match_option(option, "-Xconcurrentio")) {
2714 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2715 return JNI_EINVAL;
2716 }
2717 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2718 return JNI_EINVAL;
2719 }
2720 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2721 return JNI_EINVAL;
2722 }
2723 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2724 return JNI_EINVAL;
2725 }
2726 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2727 return JNI_EINVAL;
2728 }
2729
2730 // -Xinternalversion
2731 } else if (match_option(option, "-Xinternalversion")) {
2732 jio_fprintf(defaultStream::output_stream(), "%s\n",
2733 VM_Version::internal_vm_info_string());
2734 vm_exit(0);
2735 #ifndef PRODUCT
2736 // -Xprintflags
2737 } else if (match_option(option, "-Xprintflags")) {
2738 CommandLineFlags::printFlags(tty, false);
2739 vm_exit(0);
2740 #endif
2741 // -D
2742 } else if (match_option(option, "-D", &tail)) {
2743 const char* value;
2744 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2745 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2746 // abort if -Djava.endorsed.dirs is set
2747 jio_fprintf(defaultStream::output_stream(),
2748 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2749 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2750 return JNI_EINVAL;
2751 }
2752 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2753 *value != '\0' && strcmp(value, "\"\"") != 0) {
2754 // abort if -Djava.ext.dirs is set
2755 jio_fprintf(defaultStream::output_stream(),
2756 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2757 return JNI_EINVAL;
2758 }
2759
2760 if (!add_property(tail)) {
2761 return JNI_ENOMEM;
2762 }
2763 // Out of the box management support
2764 if (match_option(option, "-Dcom.sun.management", &tail)) {
2765 #if INCLUDE_MANAGEMENT
2766 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
2767 return JNI_EINVAL;
2768 }
2769 #else
2770 jio_fprintf(defaultStream::output_stream(),
2771 "-Dcom.sun.management is not supported in this VM.\n");
2772 return JNI_ERR;
2773 #endif
2774 }
2775 // -Xint
2776 } else if (match_option(option, "-Xint")) {
2777 set_mode_flags(_int);
2778 // -Xmixed
2779 } else if (match_option(option, "-Xmixed")) {
2780 set_mode_flags(_mixed);
2781 // -Xcomp
2782 } else if (match_option(option, "-Xcomp")) {
2783 // for testing the compiler; turn off all flags that inhibit compilation
2784 set_mode_flags(_comp);
2785 // -Xshare:dump
2786 } else if (match_option(option, "-Xshare:dump")) {
2787 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
2788 return JNI_EINVAL;
2789 }
2790 set_mode_flags(_int); // Prevent compilation, which creates objects
2791 // -Xshare:on
2792 } else if (match_option(option, "-Xshare:on")) {
2793 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2794 return JNI_EINVAL;
2795 }
2796 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
2797 return JNI_EINVAL;
2798 }
2799 // -Xshare:auto
2800 } else if (match_option(option, "-Xshare:auto")) {
2801 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2802 return JNI_EINVAL;
2803 }
2804 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2805 return JNI_EINVAL;
2806 }
2807 // -Xshare:off
2808 } else if (match_option(option, "-Xshare:off")) {
2809 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
2810 return JNI_EINVAL;
2811 }
2812 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2813 return JNI_EINVAL;
2814 }
2815 // -Xverify
2816 } else if (match_option(option, "-Xverify", &tail)) {
2817 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2818 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
2819 return JNI_EINVAL;
2820 }
2821 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
2822 return JNI_EINVAL;
2823 }
2824 } else if (strcmp(tail, ":remote") == 0) {
2825 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
2826 return JNI_EINVAL;
2827 }
2828 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
2829 return JNI_EINVAL;
2830 }
2831 } else if (strcmp(tail, ":none") == 0) {
2832 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
2833 return JNI_EINVAL;
2834 }
2835 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
2836 return JNI_EINVAL;
2837 }
2838 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2839 return JNI_EINVAL;
2840 }
2841 // -Xdebug
2842 } else if (match_option(option, "-Xdebug")) {
2843 // note this flag has been used, then ignore
2844 set_xdebug_mode(true);
2845 // -Xnoagent
2846 } else if (match_option(option, "-Xnoagent")) {
2847 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2848 } else if (match_option(option, "-Xloggc:", &tail)) {
2849 // Redirect GC output to the file. -Xloggc:<filename>
2850 // ostream_init_log(), when called will use this filename
2851 // to initialize a fileStream.
2852 _gc_log_filename = os::strdup_check_oom(tail);
2853 if (!is_filename_valid(_gc_log_filename)) {
2854 jio_fprintf(defaultStream::output_stream(),
2855 "Invalid file name for use with -Xloggc: Filename can only contain the "
2856 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2857 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2858 return JNI_EINVAL;
2859 }
2860 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
2861 return JNI_EINVAL;
2862 }
2863 if (FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true) != Flag::SUCCESS) {
2864 return JNI_EINVAL;
2865 }
2866 // JNI hooks
2867 } else if (match_option(option, "-Xcheck", &tail)) {
2868 if (!strcmp(tail, ":jni")) {
2869 #if !INCLUDE_JNI_CHECK
2870 warning("JNI CHECKING is not supported in this VM");
2871 #else
2872 CheckJNICalls = true;
2873 #endif // INCLUDE_JNI_CHECK
2874 } else if (is_bad_option(option, args->ignoreUnrecognized,
2875 "check")) {
2876 return JNI_EINVAL;
2877 }
2878 } else if (match_option(option, "vfprintf")) {
2879 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2880 } else if (match_option(option, "exit")) {
2881 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2882 } else if (match_option(option, "abort")) {
2883 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2884 // -XX:+AggressiveHeap
2885 } else if (match_option(option, "-XX:+AggressiveHeap")) {
2886
2887 // This option inspects the machine and attempts to set various
2888 // parameters to be optimal for long-running, memory allocation
2889 // intensive jobs. It is intended for machines with large
2890 // amounts of cpu and memory.
2891
2892 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2893 // VM, but we may not be able to represent the total physical memory
2894 // available (like having 8gb of memory on a box but using a 32bit VM).
2895 // Thus, we need to make sure we're using a julong for intermediate
2896 // calculations.
2897 julong initHeapSize;
2898 julong total_memory = os::physical_memory();
2899
2900 if (total_memory < (julong)256*M) {
2901 jio_fprintf(defaultStream::error_stream(),
2902 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2903 vm_exit(1);
2904 }
2905
2906 // The heap size is half of available memory, or (at most)
2907 // all of possible memory less 160mb (leaving room for the OS
2908 // when using ISM). This is the maximum; because adaptive sizing
2909 // is turned on below, the actual space used may be smaller.
2910
2911 initHeapSize = MIN2(total_memory / (julong)2,
2912 total_memory - (julong)160*M);
2913
2914 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2915
2916 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2917 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2918 return JNI_EINVAL;
2919 }
2920 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2921 return JNI_EINVAL;
2922 }
2923 // Currently the minimum size and the initial heap sizes are the same.
2924 set_min_heap_size(initHeapSize);
2925 }
2926 if (FLAG_IS_DEFAULT(NewSize)) {
2927 // Make the young generation 3/8ths of the total heap.
2928 if (FLAG_SET_CMDLINE(size_t, NewSize,
2929 ((julong)MaxHeapSize / (julong)8) * (julong)3) != Flag::SUCCESS) {
2930 return JNI_EINVAL;
2931 }
2932 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2933 return JNI_EINVAL;
2934 }
2935 }
2936
2937 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2938 FLAG_SET_DEFAULT(UseLargePages, true);
2939 #endif
2940
2941 // Increase some data structure sizes for efficiency
2942 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2943 return JNI_EINVAL;
2944 }
2945 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2946 return JNI_EINVAL;
2947 }
2948 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256*K) != Flag::SUCCESS) {
2949 return JNI_EINVAL;
2950 }
2951
2952 // See the OldPLABSize comment below, but replace 'after promotion'
2953 // with 'after copying'. YoungPLABSize is the size of the survivor
2954 // space per-gc-thread buffers. The default is 4kw.
2955 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K) != Flag::SUCCESS) { // Note: this is in words
2956 return JNI_EINVAL;
2957 }
2958
2959 // OldPLABSize is the size of the buffers in the old gen that
2960 // UseParallelGC uses to promote live data that doesn't fit in the
2961 // survivor spaces. At any given time, there's one for each gc thread.
2962 // The default size is 1kw. These buffers are rarely used, since the
2963 // survivor spaces are usually big enough. For specjbb, however, there
2964 // are occasions when there's lots of live data in the young gen
2965 // and we end up promoting some of it. We don't have a definite
2966 // explanation for why bumping OldPLABSize helps, but the theory
2967 // is that a bigger PLAB results in retaining something like the
2968 // original allocation order after promotion, which improves mutator
2969 // locality. A minor effect may be that larger PLABs reduce the
2970 // number of PLAB allocation events during gc. The value of 8kw
2971 // was arrived at by experimenting with specjbb.
2972 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K) != Flag::SUCCESS) { // Note: this is in words
2973 return JNI_EINVAL;
2974 }
2975
2976 // Enable parallel GC and adaptive generation sizing
2977 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2978 return JNI_EINVAL;
2979 }
2980 FLAG_SET_DEFAULT(ParallelGCThreads,
2981 Abstract_VM_Version::parallel_worker_threads());
2982
2983 // Encourage steady state memory management
2984 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2985 return JNI_EINVAL;
2986 }
2987
2988 // This appears to improve mutator locality
2989 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2990 return JNI_EINVAL;
2991 }
2992
2993 // Get around early Solaris scheduling bug
2994 // (affinity vs other jobs on system)
2995 // but disallow DR and offlining (5008695).
2996 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2997 return JNI_EINVAL;
2998 }
2999
3000 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3001 // and the last option wins.
3002 } else if (match_option(option, "-XX:+NeverTenure")) {
3003 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3004 return JNI_EINVAL;
3005 }
3006 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3007 return JNI_EINVAL;
3008 }
3009 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3010 return JNI_EINVAL;
3011 }
3012 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3013 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3014 return JNI_EINVAL;
3015 }
3016 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3017 return JNI_EINVAL;
3018 }
3019 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3020 return JNI_EINVAL;
3021 }
3022 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3023 uintx max_tenuring_thresh = 0;
3024 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3025 jio_fprintf(defaultStream::error_stream(),
3026 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3027 return JNI_EINVAL;
3028 }
3029
3030 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3031 return JNI_EINVAL;
3032 }
3033
3034 if (MaxTenuringThreshold == 0) {
3035 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3036 return JNI_EINVAL;
3037 }
3038 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3039 return JNI_EINVAL;
3040 }
3041 } else {
3042 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3043 return JNI_EINVAL;
3044 }
3045 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3046 return JNI_EINVAL;
3047 }
3048 }
3049 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3050 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3051 return JNI_EINVAL;
3052 }
3053 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3054 return JNI_EINVAL;
3055 }
3056 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3057 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3058 return JNI_EINVAL;
3059 }
3060 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3061 return JNI_EINVAL;
3062 }
3063 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3064 #if defined(DTRACE_ENABLED)
3065 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3066 return JNI_EINVAL;
3067 }
3068 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3069 return JNI_EINVAL;
3070 }
3071 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3072 return JNI_EINVAL;
3073 }
3074 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3075 return JNI_EINVAL;
3076 }
3077 #else // defined(DTRACE_ENABLED)
3078 jio_fprintf(defaultStream::error_stream(),
3079 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3080 return JNI_EINVAL;
3081 #endif // defined(DTRACE_ENABLED)
3082 #ifdef ASSERT
3083 } else if (match_option(option, "-XX:+FullGCALot")) {
3084 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3085 return JNI_EINVAL;
3086 }
3087 // disable scavenge before parallel mark-compact
3088 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3089 return JNI_EINVAL;
3090 }
3091 #endif
3092 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3093 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3094 julong stack_size = 0;
3095 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3096 if (errcode != arg_in_range) {
3097 jio_fprintf(defaultStream::error_stream(),
3098 "Invalid mark stack size: %s\n", option->optionString);
3099 describe_range_error(errcode);
3100 return JNI_EINVAL;
3101 }
3102 jio_fprintf(defaultStream::error_stream(),
3103 "Please use -XX:MarkStackSize in place of "
3104 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n");
3105 if (FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size) != Flag::SUCCESS) {
3106 return JNI_EINVAL;
3107 }
3108 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3109 julong max_stack_size = 0;
3110 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3111 if (errcode != arg_in_range) {
3112 jio_fprintf(defaultStream::error_stream(),
3113 "Invalid maximum mark stack size: %s\n",
3114 option->optionString);
3115 describe_range_error(errcode);
3116 return JNI_EINVAL;
3117 }
3118 jio_fprintf(defaultStream::error_stream(),
3119 "Please use -XX:MarkStackSizeMax in place of "
3120 "-XX:CMSMarkStackSizeMax in the future\n");
3121 if (FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size) != Flag::SUCCESS) {
3122 return JNI_EINVAL;
3123 }
3124 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3125 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3126 uintx conc_threads = 0;
3127 if (!parse_uintx(tail, &conc_threads, 1)) {
3128 jio_fprintf(defaultStream::error_stream(),
3129 "Invalid concurrent threads: %s\n", option->optionString);
3130 return JNI_EINVAL;
3131 }
3132 jio_fprintf(defaultStream::error_stream(),
3133 "Please use -XX:ConcGCThreads in place of "
3134 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n");
3135 if (FLAG_SET_CMDLINE(uint, ConcGCThreads, conc_threads) != Flag::SUCCESS) {
3136 return JNI_EINVAL;
3137 }
3138 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3139 julong max_direct_memory_size = 0;
3140 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3141 if (errcode != arg_in_range) {
3142 jio_fprintf(defaultStream::error_stream(),
3143 "Invalid maximum direct memory size: %s\n",
3144 option->optionString);
3145 describe_range_error(errcode);
3146 return JNI_EINVAL;
3147 }
3148 if (FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size) != Flag::SUCCESS) {
3149 return JNI_EINVAL;
3150 }
3151 #if !INCLUDE_MANAGEMENT
3152 } else if (match_option(option, "-XX:+ManagementServer")) {
3153 jio_fprintf(defaultStream::error_stream(),
3154 "ManagementServer is not supported in this VM.\n");
3155 return JNI_ERR;
3156 #endif // INCLUDE_MANAGEMENT
3157 // CreateMinidumpOnCrash is removed, and replaced by CreateCoredumpOnCrash
3158 } else if (match_option(option, "-XX:+CreateMinidumpOnCrash")) {
3159 if (FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, true) != Flag::SUCCESS) {
3160 return JNI_EINVAL;
3161 }
3162 jio_fprintf(defaultStream::output_stream(),
3163 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is on\n");
3164 } else if (match_option(option, "-XX:-CreateMinidumpOnCrash")) {
3165 if (FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, false) != Flag::SUCCESS) {
3166 return JNI_EINVAL;
3167 }
3168 jio_fprintf(defaultStream::output_stream(),
3169 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is off\n");
3170 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3171 // Skip -XX:Flags= since that case has already been handled
3172 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3173 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3174 return JNI_EINVAL;
3175 }
3176 }
3177 // Unknown option
3178 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3179 return JNI_ERR;
3180 }
3181 }
3182
3183 // PrintSharedArchiveAndExit will turn on
3184 // -Xshare:on
3185 // -XX:+TraceClassPaths
3186 if (PrintSharedArchiveAndExit) {
3187 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3188 return JNI_EINVAL;
3189 }
3190 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3191 return JNI_EINVAL;
3192 }
3193 if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) {
3194 return JNI_EINVAL;
3195 }
3196 }
3197
3198 // Change the default value for flags which have different default values
3199 // when working with older JDKs.
3200 #ifdef LINUX
3201 if (JDK_Version::current().compare_major(6) <= 0 &&
3202 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3203 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3204 }
3205 #endif // LINUX
3206 fix_appclasspath();
3207 return JNI_OK;
3208 }
3209
3210 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3211 //
3212 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3213 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3214 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3215 // path is treated as the current directory.
3216 //
3217 // This causes problems with CDS, which requires that all directories specified in the classpath
3218 // must be empty. In most cases, applications do NOT want to load classes from the current
3219 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3220 // scripts compatible with CDS.
3221 void Arguments::fix_appclasspath() {
3222 if (IgnoreEmptyClassPaths) {
3223 const char separator = *os::path_separator();
3224 const char* src = _java_class_path->value();
3225
3226 // skip over all the leading empty paths
3227 while (*src == separator) {
3228 src ++;
3229 }
3230
3231 char* copy = os::strdup_check_oom(src, mtInternal);
3232
3233 // trim all trailing empty paths
3234 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3235 *tail = '\0';
3236 }
3237
3238 char from[3] = {separator, separator, '\0'};
3239 char to [2] = {separator, '\0'};
3240 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3241 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3242 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3243 }
3244
3245 _java_class_path->set_value(copy);
3246 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3247 }
3248
3249 if (!PrintSharedArchiveAndExit) {
3250 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3251 }
3252 }
3253
3254 static bool has_jar_files(const char* directory) {
3255 DIR* dir = os::opendir(directory);
3256 if (dir == NULL) return false;
3257
3258 struct dirent *entry;
3259 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3260 bool hasJarFile = false;
3261 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3262 const char* name = entry->d_name;
3263 const char* ext = name + strlen(name) - 4;
3264 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3265 }
3266 FREE_C_HEAP_ARRAY(char, dbuf);
3267 os::closedir(dir);
3268 return hasJarFile ;
3269 }
3270
3271 static int check_non_empty_dirs(const char* path) {
3272 const char separator = *os::path_separator();
3273 const char* const end = path + strlen(path);
3274 int nonEmptyDirs = 0;
3275 while (path < end) {
3276 const char* tmp_end = strchr(path, separator);
3277 if (tmp_end == NULL) {
3278 if (has_jar_files(path)) {
3279 nonEmptyDirs++;
3280 jio_fprintf(defaultStream::output_stream(),
3281 "Non-empty directory: %s\n", path);
3282 }
3283 path = end;
3284 } else {
3285 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3286 memcpy(dirpath, path, tmp_end - path);
3287 dirpath[tmp_end - path] = '\0';
3288 if (has_jar_files(dirpath)) {
3289 nonEmptyDirs++;
3290 jio_fprintf(defaultStream::output_stream(),
3291 "Non-empty directory: %s\n", dirpath);
3292 }
3293 FREE_C_HEAP_ARRAY(char, dirpath);
3294 path = tmp_end + 1;
3295 }
3296 }
3297 return nonEmptyDirs;
3298 }
3299
3300 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3301 // check if the default lib/endorsed directory exists; if so, error
3302 char path[JVM_MAXPATHLEN];
3303 const char* fileSep = os::file_separator();
3304 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3305
3306 if (CheckEndorsedAndExtDirs) {
3307 int nonEmptyDirs = 0;
3308 // check endorsed directory
3309 nonEmptyDirs += check_non_empty_dirs(path);
3310 // check the extension directories
3311 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3312 if (nonEmptyDirs > 0) {
3313 return JNI_ERR;
3314 }
3315 }
3316
3317 DIR* dir = os::opendir(path);
3318 if (dir != NULL) {
3319 jio_fprintf(defaultStream::output_stream(),
3320 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3321 "in modular form will be supported via the concept of upgradeable modules.\n");
3322 os::closedir(dir);
3323 return JNI_ERR;
3324 }
3325
3326 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3327 dir = os::opendir(path);
3328 if (dir != NULL) {
3329 jio_fprintf(defaultStream::output_stream(),
3330 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3331 "Use -classpath instead.\n.");
3332 os::closedir(dir);
3333 return JNI_ERR;
3334 }
3335
3336 if (scp_assembly_required) {
3337 // Assemble the bootclasspath elements into the final path.
3338 Arguments::set_sysclasspath(scp_p->combined_path());
3339 }
3340
3341 // This must be done after all arguments have been processed.
3342 // java_compiler() true means set to "NONE" or empty.
3343 if (java_compiler() && !xdebug_mode()) {
3344 // For backwards compatibility, we switch to interpreted mode if
3345 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3346 // not specified.
3347 set_mode_flags(_int);
3348 }
3349
3350 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3351 // but like -Xint, leave compilation thresholds unaffected.
3352 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3353 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3354 set_mode_flags(_int);
3355 }
3356
3357 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3358 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3359 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3360 }
3361
3362 #ifndef COMPILER2
3363 // Don't degrade server performance for footprint
3364 if (FLAG_IS_DEFAULT(UseLargePages) &&
3365 MaxHeapSize < LargePageHeapSizeThreshold) {
3366 // No need for large granularity pages w/small heaps.
3367 // Note that large pages are enabled/disabled for both the
3368 // Java heap and the code cache.
3369 FLAG_SET_DEFAULT(UseLargePages, false);
3370 }
3371
3372 #else
3373 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3374 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3375 }
3376 #endif
3377
3378 #ifndef TIERED
3379 // Tiered compilation is undefined.
3380 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3381 #endif
3382
3383 // If we are running in a headless jre, force java.awt.headless property
3384 // to be true unless the property has already been set.
3385 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3386 if (os::is_headless_jre()) {
3387 const char* headless = Arguments::get_property("java.awt.headless");
3388 if (headless == NULL) {
3389 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3390 if (headless_env == NULL) {
3391 if (!add_property("java.awt.headless=true")) {
3392 return JNI_ENOMEM;
3393 }
3394 } else {
3395 char buffer[256];
3396 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3397 if (!add_property(buffer)) {
3398 return JNI_ENOMEM;
3399 }
3400 }
3401 }
3402 }
3403
3404 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3405 // CMS can only be used with ParNew
3406 FLAG_SET_ERGO(bool, UseParNewGC, true);
3407 }
3408
3409 if (!check_vm_args_consistency()) {
3410 return JNI_ERR;
3411 }
3412
3413 return JNI_OK;
3414 }
3415
3416 // Helper class for controlling the lifetime of JavaVMInitArgs
3417 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3418 // deleted on the destruction of the ScopedVMInitArgs object.
3419 class ScopedVMInitArgs : public StackObj {
3420 private:
3421 JavaVMInitArgs _args;
3422
3423 public:
3424 ScopedVMInitArgs() {
3425 _args.version = JNI_VERSION_1_2;
3426 _args.nOptions = 0;
3427 _args.options = NULL;
3428 _args.ignoreUnrecognized = false;
3429 }
3430
3431 // Populates the JavaVMInitArgs object represented by this
3432 // ScopedVMInitArgs object with the arguments in options. The
3433 // allocated memory is deleted by the destructor. If this method
3434 // returns anything other than JNI_OK, then this object is in a
3435 // partially constructed state, and should be abandoned.
3436 jint set_args(GrowableArray<JavaVMOption>* options) {
3437 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3438 JavaVMOption, options->length(), mtInternal);
3439 if (options_arr == NULL) {
3440 return JNI_ENOMEM;
3441 }
3442 _args.options = options_arr;
3443
3444 for (int i = 0; i < options->length(); i++) {
3445 options_arr[i] = options->at(i);
3446 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3447 if (options_arr[i].optionString == NULL) {
3448 // Rely on the destructor to do cleanup.
3449 _args.nOptions = i;
3450 return JNI_ENOMEM;
3451 }
3452 }
3453
3454 _args.nOptions = options->length();
3455 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3456 return JNI_OK;
3457 }
3458
3459 JavaVMInitArgs* get() { return &_args; }
3460
3461 ~ScopedVMInitArgs() {
3462 if (_args.options == NULL) return;
3463 for (int i = 0; i < _args.nOptions; i++) {
3464 os::free(_args.options[i].optionString);
3465 }
3466 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3467 }
3468 };
3469
3470 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3471 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3472 }
3473
3474 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3475 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3476 }
3477
3478 jint Arguments::parse_options_environment_variable(const char* name,
3479 ScopedVMInitArgs* vm_args) {
3480 char *buffer = ::getenv(name);
3481
3482 // Don't check this environment variable if user has special privileges
3483 // (e.g. unix su command).
3484 if (buffer == NULL || os::have_special_privileges()) {
3485 return JNI_OK;
3486 }
3487
3488 if ((buffer = os::strdup(buffer)) == NULL) {
3489 return JNI_ENOMEM;
3490 }
3491
3492 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3493 jio_fprintf(defaultStream::error_stream(),
3494 "Picked up %s: %s\n", name, buffer);
3495 char* rd = buffer; // pointer to the input string (rd)
3496 while (true) { // repeat for all options in the input string
3497 while (isspace(*rd)) rd++; // skip whitespace
3498 if (*rd == 0) break; // we re done when the input string is read completely
3499
3500 // The output, option string, overwrites the input string.
3501 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3502 // input string (rd).
3503 char* wrt = rd;
3504
3505 JavaVMOption option;
3506 option.optionString = wrt;
3507 options->append(option); // Fill in option
3508 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3509 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3510 int quote = *rd; // matching quote to look for
3511 rd++; // don't copy open quote
3512 while (*rd != quote) { // include everything (even spaces) up until quote
3513 if (*rd == 0) { // string termination means unmatched string
3514 jio_fprintf(defaultStream::error_stream(),
3515 "Unmatched quote in %s\n", name);
3516 delete options;
3517 os::free(buffer);
3518 return JNI_ERR;
3519 }
3520 *wrt++ = *rd++; // copy to option string
3521 }
3522 rd++; // don't copy close quote
3523 } else {
3524 *wrt++ = *rd++; // copy to option string
3525 }
3526 }
3527 if (*rd != 0) {
3528 // In this case, the assignment to wrt below will make *rd nul,
3529 // which will interfere with the next loop iteration.
3530 rd++;
3531 }
3532 *wrt = 0; // Zero terminate option
3533 }
3534
3535 // Fill out JavaVMInitArgs structure.
3536 jint status = vm_args->set_args(options);
3537
3538 delete options;
3539 os::free(buffer);
3540 return status;
3541 }
3542
3543 void Arguments::set_shared_spaces_flags() {
3544 if (DumpSharedSpaces) {
3545 if (RequireSharedSpaces) {
3546 warning("cannot dump shared archive while using shared archive");
3547 }
3548 UseSharedSpaces = false;
3549 #ifdef _LP64
3550 if (!UseCompressedOops || !UseCompressedClassPointers) {
3551 vm_exit_during_initialization(
3552 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3553 }
3554 } else {
3555 if (!UseCompressedOops || !UseCompressedClassPointers) {
3556 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3557 }
3558 #endif
3559 }
3560 }
3561
3562 #if !INCLUDE_ALL_GCS
3563 static void force_serial_gc() {
3564 FLAG_SET_DEFAULT(UseSerialGC, true);
3565 UNSUPPORTED_GC_OPTION(UseG1GC);
3566 UNSUPPORTED_GC_OPTION(UseParallelGC);
3567 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3568 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3569 UNSUPPORTED_GC_OPTION(UseParNewGC);
3570 }
3571 #endif // INCLUDE_ALL_GCS
3572
3573 // Sharing support
3574 // Construct the path to the archive
3575 static char* get_shared_archive_path() {
3576 char *shared_archive_path;
3577 if (SharedArchiveFile == NULL) {
3578 char jvm_path[JVM_MAXPATHLEN];
3579 os::jvm_path(jvm_path, sizeof(jvm_path));
3580 char *end = strrchr(jvm_path, *os::file_separator());
3581 if (end != NULL) *end = '\0';
3582 size_t jvm_path_len = strlen(jvm_path);
3583 size_t file_sep_len = strlen(os::file_separator());
3584 const size_t len = jvm_path_len + file_sep_len + 20;
3585 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3586 if (shared_archive_path != NULL) {
3587 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3588 jvm_path, os::file_separator());
3589 }
3590 } else {
3591 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3592 }
3593 return shared_archive_path;
3594 }
3595
3596 #ifndef PRODUCT
3597 // Determine whether LogVMOutput should be implicitly turned on.
3598 static bool use_vm_log() {
3599 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3600 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3601 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3602 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3603 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3604 return true;
3605 }
3606
3607 #ifdef COMPILER1
3608 if (PrintC1Statistics) {
3609 return true;
3610 }
3611 #endif // COMPILER1
3612
3613 #ifdef COMPILER2
3614 if (PrintOptoAssembly || PrintOptoStatistics) {
3615 return true;
3616 }
3617 #endif // COMPILER2
3618
3619 return false;
3620 }
3621 #endif // PRODUCT
3622
3623 static jint match_special_option_and_act(const JavaVMInitArgs* args,
3624 char** flags_file) {
3625 // Remaining part of option string
3626 const char* tail;
3627
3628 for (int index = 0; index < args->nOptions; index++) {
3629 const JavaVMOption* option = args->options + index;
3630 if (ArgumentsExt::process_options(option)) {
3631 continue;
3632 }
3633 if (match_option(option, "-XX:Flags=", &tail)) {
3634 *flags_file = (char *) tail;
3635 continue;
3636 }
3637 if (match_option(option, "-XX:+PrintVMOptions")) {
3638 PrintVMOptions = true;
3639 continue;
3640 }
3641 if (match_option(option, "-XX:-PrintVMOptions")) {
3642 PrintVMOptions = false;
3643 continue;
3644 }
3645 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3646 IgnoreUnrecognizedVMOptions = true;
3647 continue;
3648 }
3649 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3650 IgnoreUnrecognizedVMOptions = false;
3651 continue;
3652 }
3653 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3654 CommandLineFlags::printFlags(tty, false);
3655 vm_exit(0);
3656 }
3657 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3658 #if INCLUDE_NMT
3659 // The launcher did not setup nmt environment variable properly.
3660 if (!MemTracker::check_launcher_nmt_support(tail)) {
3661 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3662 }
3663
3664 // Verify if nmt option is valid.
3665 if (MemTracker::verify_nmt_option()) {
3666 // Late initialization, still in single-threaded mode.
3667 if (MemTracker::tracking_level() >= NMT_summary) {
3668 MemTracker::init();
3669 }
3670 } else {
3671 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3672 }
3673 continue;
3674 #else
3675 jio_fprintf(defaultStream::error_stream(),
3676 "Native Memory Tracking is not supported in this VM\n");
3677 return JNI_ERR;
3678 #endif
3679 }
3680
3681 #ifndef PRODUCT
3682 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3683 CommandLineFlags::printFlags(tty, true);
3684 vm_exit(0);
3685 }
3686 #endif
3687 }
3688 return JNI_OK;
3689 }
3690
3691 static void print_options(const JavaVMInitArgs *args) {
3692 const char* tail;
3693 for (int index = 0; index < args->nOptions; index++) {
3694 const JavaVMOption *option = args->options + index;
3695 if (match_option(option, "-XX:", &tail)) {
3696 logOption(tail);
3697 }
3698 }
3699 }
3700
3701 // Parse entry point called from JNI_CreateJavaVM
3702
3703 jint Arguments::parse(const JavaVMInitArgs* args) {
3704
3705 // Initialize ranges and constraints
3706 CommandLineFlagRangeList::init();
3707 CommandLineFlagConstraintList::init();
3708
3709 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3710 const char* hotspotrc = ".hotspotrc";
3711 char* flags_file = NULL;
3712 bool settings_file_specified = false;
3713 bool needs_hotspotrc_warning = false;
3714 ScopedVMInitArgs java_tool_options_args;
3715 ScopedVMInitArgs java_options_args;
3716
3717 jint code =
3718 parse_java_tool_options_environment_variable(&java_tool_options_args);
3719 if (code != JNI_OK) {
3720 return code;
3721 }
3722
3723 code = parse_java_options_environment_variable(&java_options_args);
3724 if (code != JNI_OK) {
3725 return code;
3726 }
3727
3728 code =
3729 match_special_option_and_act(java_tool_options_args.get(), &flags_file);
3730 if (code != JNI_OK) {
3731 return code;
3732 }
3733
3734 code = match_special_option_and_act(args, &flags_file);
3735 if (code != JNI_OK) {
3736 return code;
3737 }
3738
3739 code = match_special_option_and_act(java_options_args.get(), &flags_file);
3740 if (code != JNI_OK) {
3741 return code;
3742 }
3743
3744 settings_file_specified = (flags_file != NULL);
3745
3746 if (IgnoreUnrecognizedVMOptions) {
3747 // uncast const to modify the flag args->ignoreUnrecognized
3748 *(jboolean*)(&args->ignoreUnrecognized) = true;
3749 java_tool_options_args.get()->ignoreUnrecognized = true;
3750 java_options_args.get()->ignoreUnrecognized = true;
3751 }
3752
3753 // Parse specified settings file
3754 if (settings_file_specified) {
3755 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3756 return JNI_EINVAL;
3757 }
3758 } else {
3759 #ifdef ASSERT
3760 // Parse default .hotspotrc settings file
3761 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3762 return JNI_EINVAL;
3763 }
3764 #else
3765 struct stat buf;
3766 if (os::stat(hotspotrc, &buf) == 0) {
3767 needs_hotspotrc_warning = true;
3768 }
3769 #endif
3770 }
3771
3772 if (PrintVMOptions) {
3773 print_options(java_tool_options_args.get());
3774 print_options(args);
3775 print_options(java_options_args.get());
3776 }
3777
3778 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3779 jint result = parse_vm_init_args(java_tool_options_args.get(),
3780 java_options_args.get(), args);
3781
3782 if (result != JNI_OK) {
3783 return result;
3784 }
3785
3786 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3787 SharedArchivePath = get_shared_archive_path();
3788 if (SharedArchivePath == NULL) {
3789 return JNI_ENOMEM;
3790 }
3791
3792 // Set up VerifySharedSpaces
3793 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3794 VerifySharedSpaces = true;
3795 }
3796
3797 // Delay warning until here so that we've had a chance to process
3798 // the -XX:-PrintWarnings flag
3799 if (needs_hotspotrc_warning) {
3800 warning("%s file is present but has been ignored. "
3801 "Run with -XX:Flags=%s to load the file.",
3802 hotspotrc, hotspotrc);
3803 }
3804
3805 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3806 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3807 #endif
3808
3809 ArgumentsExt::report_unsupported_options();
3810
3811 #ifndef PRODUCT
3812 if (TraceBytecodesAt != 0) {
3813 TraceBytecodes = true;
3814 }
3815 if (CountCompiledCalls) {
3816 if (UseCounterDecay) {
3817 warning("UseCounterDecay disabled because CountCalls is set");
3818 UseCounterDecay = false;
3819 }
3820 }
3821 #endif // PRODUCT
3822
3823 if (ScavengeRootsInCode == 0) {
3824 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3825 warning("forcing ScavengeRootsInCode non-zero");
3826 }
3827 ScavengeRootsInCode = 1;
3828 }
3829
3830 if (PrintGCDetails) {
3831 // Turn on -verbose:gc options as well
3832 PrintGC = true;
3833 }
3834
3835 // Set object alignment values.
3836 set_object_alignment();
3837
3838 #if !INCLUDE_ALL_GCS
3839 force_serial_gc();
3840 #endif // INCLUDE_ALL_GCS
3841 #if !INCLUDE_CDS
3842 if (DumpSharedSpaces || RequireSharedSpaces) {
3843 jio_fprintf(defaultStream::error_stream(),
3844 "Shared spaces are not supported in this VM\n");
3845 return JNI_ERR;
3846 }
3847 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3848 warning("Shared spaces are not supported in this VM");
3849 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3850 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3851 }
3852 no_shared_spaces("CDS Disabled");
3853 #endif // INCLUDE_CDS
3854
3855 return JNI_OK;
3856 }
3857
3858 jint Arguments::apply_ergo() {
3859
3860 // Set flags based on ergonomics.
3861 set_ergonomics_flags();
3862
3863 set_shared_spaces_flags();
3864
3865 // Check the GC selections again.
3866 if (!check_gc_consistency()) {
3867 return JNI_EINVAL;
3868 }
3869
3870 if (TieredCompilation) {
3871 set_tiered_flags();
3872 } else {
3873 int max_compilation_policy_choice = 1;
3874 #ifdef COMPILER2
3875 max_compilation_policy_choice = 2;
3876 #endif
3877 // Check if the policy is valid.
3878 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
3879 vm_exit_during_initialization(
3880 "Incompatible compilation policy selected", NULL);
3881 }
3882 // Scale CompileThreshold
3883 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
3884 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
3885 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
3886 }
3887 }
3888
3889 #ifdef COMPILER2
3890 #ifndef PRODUCT
3891 if (PrintIdealGraphLevel > 0) {
3892 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3893 }
3894 #endif
3895 #endif
3896
3897 // Set heap size based on available physical memory
3898 set_heap_size();
3899
3900 ArgumentsExt::set_gc_specific_flags();
3901
3902 // Initialize Metaspace flags and alignments
3903 Metaspace::ergo_initialize();
3904
3905 // Set bytecode rewriting flags
3906 set_bytecode_flags();
3907
3908 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3909 set_aggressive_opts_flags();
3910
3911 // Turn off biased locking for locking debug mode flags,
3912 // which are subtly different from each other but neither works with
3913 // biased locking
3914 if (UseHeavyMonitors
3915 #ifdef COMPILER1
3916 || !UseFastLocking
3917 #endif // COMPILER1
3918 ) {
3919 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3920 // flag set to true on command line; warn the user that they
3921 // can't enable biased locking here
3922 warning("Biased Locking is not supported with locking debug flags"
3923 "; ignoring UseBiasedLocking flag." );
3924 }
3925 UseBiasedLocking = false;
3926 }
3927
3928 #ifdef ZERO
3929 // Clear flags not supported on zero.
3930 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3931 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3932 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3933 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3934 #endif // CC_INTERP
3935
3936 #ifdef COMPILER2
3937 if (!EliminateLocks) {
3938 EliminateNestedLocks = false;
3939 }
3940 if (!Inline) {
3941 IncrementalInline = false;
3942 }
3943 #ifndef PRODUCT
3944 if (!IncrementalInline) {
3945 AlwaysIncrementalInline = false;
3946 }
3947 #endif
3948 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3949 // nothing to use the profiling, turn if off
3950 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3951 }
3952 #endif
3953
3954 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3955 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3956 DebugNonSafepoints = true;
3957 }
3958
3959 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3960 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3961 }
3962
3963 #ifndef PRODUCT
3964 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3965 if (use_vm_log()) {
3966 LogVMOutput = true;
3967 }
3968 }
3969 #endif // PRODUCT
3970
3971 if (PrintCommandLineFlags) {
3972 CommandLineFlags::printSetFlags(tty);
3973 }
3974
3975 // Apply CPU specific policy for the BiasedLocking
3976 if (UseBiasedLocking) {
3977 if (!VM_Version::use_biased_locking() &&
3978 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3979 UseBiasedLocking = false;
3980 }
3981 }
3982 #ifdef COMPILER2
3983 if (!UseBiasedLocking || EmitSync != 0) {
3984 UseOptoBiasInlining = false;
3985 }
3986 #endif
3987
3988 return JNI_OK;
3989 }
3990
3991 jint Arguments::adjust_after_os() {
3992 if (UseNUMA) {
3993 if (UseParallelGC || UseParallelOldGC) {
3994 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3995 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3996 }
3997 }
3998 // UseNUMAInterleaving is set to ON for all collectors and
3999 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4000 // such as the parallel collector for Linux and Solaris will
4001 // interleave old gen and survivor spaces on top of NUMA
4002 // allocation policy for the eden space.
4003 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4004 // all platforms and ParallelGC on Windows will interleave all
4005 // of the heap spaces across NUMA nodes.
4006 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4007 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4008 }
4009 }
4010 return JNI_OK;
4011 }
4012
4013 // Any custom code post the 'CommandLineFlagConstraint::AfterErgo' constraint check
4014 // can be done here.
4015 void Arguments::post_after_ergo_constraint_check() {
4016 // This does not set the flag itself, but stores the value in a safe place for later usage.
4017 _min_heap_free_ratio = MinHeapFreeRatio;
4018 _max_heap_free_ratio = MaxHeapFreeRatio;
4019 }
4020
4021 int Arguments::PropertyList_count(SystemProperty* pl) {
4022 int count = 0;
4023 while(pl != NULL) {
4024 count++;
4025 pl = pl->next();
4026 }
4027 return count;
4028 }
4029
4030 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4031 assert(key != NULL, "just checking");
4032 SystemProperty* prop;
4033 for (prop = pl; prop != NULL; prop = prop->next()) {
4034 if (strcmp(key, prop->key()) == 0) return prop->value();
4035 }
4036 return NULL;
4037 }
4038
4039 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4040 int count = 0;
4041 const char* ret_val = NULL;
4042
4043 while(pl != NULL) {
4044 if(count >= index) {
4045 ret_val = pl->key();
4046 break;
4047 }
4048 count++;
4049 pl = pl->next();
4050 }
4051
4052 return ret_val;
4053 }
4054
4055 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4056 int count = 0;
4057 char* ret_val = NULL;
4058
4059 while(pl != NULL) {
4060 if(count >= index) {
4061 ret_val = pl->value();
4062 break;
4063 }
4064 count++;
4065 pl = pl->next();
4066 }
4067
4068 return ret_val;
4069 }
4070
4071 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4072 SystemProperty* p = *plist;
4073 if (p == NULL) {
4074 *plist = new_p;
4075 } else {
4076 while (p->next() != NULL) {
4077 p = p->next();
4078 }
4079 p->set_next(new_p);
4080 }
4081 }
4082
4083 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4084 if (plist == NULL)
4085 return;
4086
4087 SystemProperty* new_p = new SystemProperty(k, v, true);
4088 PropertyList_add(plist, new_p);
4089 }
4090
4091 void Arguments::PropertyList_add(SystemProperty *element) {
4092 PropertyList_add(&_system_properties, element);
4093 }
4094
4095 // This add maintains unique property key in the list.
4096 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4097 if (plist == NULL)
4098 return;
4099
4100 // If property key exist then update with new value.
4101 SystemProperty* prop;
4102 for (prop = *plist; prop != NULL; prop = prop->next()) {
4103 if (strcmp(k, prop->key()) == 0) {
4104 if (append) {
4105 prop->append_value(v);
4106 } else {
4107 prop->set_value(v);
4108 }
4109 return;
4110 }
4111 }
4112
4113 PropertyList_add(plist, k, v);
4114 }
4115
4116 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4117 // Returns true if all of the source pointed by src has been copied over to
4118 // the destination buffer pointed by buf. Otherwise, returns false.
4119 // Notes:
4120 // 1. If the length (buflen) of the destination buffer excluding the
4121 // NULL terminator character is not long enough for holding the expanded
4122 // pid characters, it also returns false instead of returning the partially
4123 // expanded one.
4124 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4125 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4126 char* buf, size_t buflen) {
4127 const char* p = src;
4128 char* b = buf;
4129 const char* src_end = &src[srclen];
4130 char* buf_end = &buf[buflen - 1];
4131
4132 while (p < src_end && b < buf_end) {
4133 if (*p == '%') {
4134 switch (*(++p)) {
4135 case '%': // "%%" ==> "%"
4136 *b++ = *p++;
4137 break;
4138 case 'p': { // "%p" ==> current process id
4139 // buf_end points to the character before the last character so
4140 // that we could write '\0' to the end of the buffer.
4141 size_t buf_sz = buf_end - b + 1;
4142 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4143
4144 // if jio_snprintf fails or the buffer is not long enough to hold
4145 // the expanded pid, returns false.
4146 if (ret < 0 || ret >= (int)buf_sz) {
4147 return false;
4148 } else {
4149 b += ret;
4150 assert(*b == '\0', "fail in copy_expand_pid");
4151 if (p == src_end && b == buf_end + 1) {
4152 // reach the end of the buffer.
4153 return true;
4154 }
4155 }
4156 p++;
4157 break;
4158 }
4159 default :
4160 *b++ = '%';
4161 }
4162 } else {
4163 *b++ = *p++;
4164 }
4165 }
4166 *b = '\0';
4167 return (p == src_end); // return false if not all of the source was copied
4168 }