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