1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "compiler/compilerOracle.hpp"
31 #include "gc/shared/cardTableRS.hpp"
32 #include "gc/shared/genCollectedHeap.hpp"
33 #include "gc/shared/referenceProcessor.hpp"
34 #include "gc/shared/taskqueue.hpp"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/universe.inline.hpp"
37 #include "oops/oop.inline.hpp"
38 #include "prims/jvmtiExport.hpp"
39 #include "runtime/arguments.hpp"
40 #include "runtime/arguments_ext.hpp"
41 #include "runtime/commandLineFlagConstraintList.hpp"
42 #include "runtime/commandLineFlagRangeList.hpp"
43 #include "runtime/globals.hpp"
44 #include "runtime/globals_extension.hpp"
45 #include "runtime/java.hpp"
46 #include "runtime/os.hpp"
47 #include "runtime/vm_version.hpp"
48 #include "services/management.hpp"
49 #include "services/memTracker.hpp"
50 #include "utilities/defaultStream.hpp"
51 #include "utilities/macros.hpp"
52 #include "utilities/stringUtils.hpp"
53 #if INCLUDE_ALL_GCS
54 #include "gc/cms/compactibleFreeListSpace.hpp"
55 #include "gc/g1/g1CollectedHeap.inline.hpp"
56 #include "gc/parallel/parallelScavengeHeap.hpp"
57 #endif // INCLUDE_ALL_GCS
58
59 // Note: This is a special bug reporting site for the JVM
60 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
61 #define DEFAULT_JAVA_LAUNCHER "generic"
62
63 #define UNSUPPORTED_GC_OPTION(gc) \
64 do { \
65 if (gc) { \
66 if (FLAG_IS_CMDLINE(gc)) { \
67 warning(#gc " is not supported in this VM. Using Serial GC."); \
68 } \
69 FLAG_SET_DEFAULT(gc, false); \
70 } \
71 } while(0)
72
73 char** Arguments::_jvm_flags_array = NULL;
74 int Arguments::_num_jvm_flags = 0;
75 char** Arguments::_jvm_args_array = NULL;
76 int Arguments::_num_jvm_args = 0;
77 char* Arguments::_java_command = NULL;
78 SystemProperty* Arguments::_system_properties = NULL;
79 const char* Arguments::_gc_log_filename = NULL;
80 bool Arguments::_has_profile = false;
81 size_t Arguments::_conservative_max_heap_alignment = 0;
82 size_t Arguments::_min_heap_size = 0;
83 uintx Arguments::_min_heap_free_ratio = 0;
84 uintx Arguments::_max_heap_free_ratio = 0;
85 Arguments::Mode Arguments::_mode = _mixed;
86 bool Arguments::_java_compiler = false;
87 bool Arguments::_xdebug_mode = false;
88 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
89 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
90 int Arguments::_sun_java_launcher_pid = -1;
91 bool Arguments::_sun_java_launcher_is_altjvm = false;
92
93 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
94 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
95 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
96 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
97 bool Arguments::_ClipInlining = ClipInlining;
98 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
99 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
100
101 char* Arguments::SharedArchivePath = NULL;
102
103 AgentLibraryList Arguments::_libraryList;
104 AgentLibraryList Arguments::_agentList;
105
106 abort_hook_t Arguments::_abort_hook = NULL;
107 exit_hook_t Arguments::_exit_hook = NULL;
108 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
109
110
111 SystemProperty *Arguments::_sun_boot_library_path = NULL;
112 SystemProperty *Arguments::_java_library_path = NULL;
113 SystemProperty *Arguments::_java_home = NULL;
114 SystemProperty *Arguments::_java_class_path = NULL;
115 SystemProperty *Arguments::_sun_boot_class_path = NULL;
116
117 char* Arguments::_ext_dirs = NULL;
118
119 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
120 // part of the option string.
121 static bool match_option(const JavaVMOption *option, const char* name,
122 const char** tail) {
123 int len = (int)strlen(name);
124 if (strncmp(option->optionString, name, len) == 0) {
125 *tail = option->optionString + len;
126 return true;
127 } else {
128 return false;
129 }
130 }
131
132 // Check if 'option' matches 'name'. No "tail" is allowed.
133 static bool match_option(const JavaVMOption *option, const char* name) {
134 const char* tail = NULL;
135 bool result = match_option(option, name, &tail);
136 if (tail != NULL && *tail == '\0') {
137 return result;
138 } else {
139 return false;
140 }
141 }
142
143 // Return true if any of the strings in null-terminated array 'names' matches.
144 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
145 // the option must match exactly.
146 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
147 bool tail_allowed) {
148 for (/* empty */; *names != NULL; ++names) {
149 if (match_option(option, *names, tail)) {
150 if (**tail == '\0' || tail_allowed && **tail == ':') {
151 return true;
152 }
153 }
154 }
155 return false;
156 }
157
158 static void logOption(const char* opt) {
159 if (PrintVMOptions) {
160 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
161 }
162 }
163
164 // Process java launcher properties.
165 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
166 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
167 // sun.java.launcher.pid is defined.
168 // Must do this before setting up other system properties,
169 // as some of them may depend on launcher type.
170 for (int index = 0; index < args->nOptions; index++) {
171 const JavaVMOption* option = args->options + index;
172 const char* tail;
173
174 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
175 process_java_launcher_argument(tail, option->extraInfo);
176 continue;
177 }
178 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
179 if (strcmp(tail, "true") == 0) {
180 _sun_java_launcher_is_altjvm = true;
181 }
182 continue;
183 }
184 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
185 _sun_java_launcher_pid = atoi(tail);
186 continue;
187 }
188 }
189 }
190
191 // Initialize system properties key and value.
192 void Arguments::init_system_properties() {
193 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
194 "Java Virtual Machine Specification", false));
195 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
196 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
197 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
198
199 // Following are JVMTI agent writable properties.
200 // Properties values are set to NULL and they are
201 // os specific they are initialized in os::init_system_properties_values().
202 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
203 _java_library_path = new SystemProperty("java.library.path", NULL, true);
204 _java_home = new SystemProperty("java.home", NULL, true);
205 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
206
207 _java_class_path = new SystemProperty("java.class.path", "", true);
208
209 // Add to System Property list.
210 PropertyList_add(&_system_properties, _sun_boot_library_path);
211 PropertyList_add(&_system_properties, _java_library_path);
212 PropertyList_add(&_system_properties, _java_home);
213 PropertyList_add(&_system_properties, _java_class_path);
214 PropertyList_add(&_system_properties, _sun_boot_class_path);
215
216 // Set OS specific system properties values
217 os::init_system_properties_values();
218 }
219
220 // Update/Initialize System properties after JDK version number is known
221 void Arguments::init_version_specific_system_properties() {
222 enum { bufsz = 16 };
223 char buffer[bufsz];
224 const char* spec_vendor = "Sun Microsystems Inc.";
225 uint32_t spec_version = 0;
226
227 spec_vendor = "Oracle Corporation";
228 spec_version = JDK_Version::current().major_version();
229 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
230
231 PropertyList_add(&_system_properties,
232 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
233 PropertyList_add(&_system_properties,
234 new SystemProperty("java.vm.specification.version", buffer, false));
235 PropertyList_add(&_system_properties,
236 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
237 }
238
239 /**
240 * Provide a slightly more user-friendly way of eliminating -XX flags.
241 * When a flag is eliminated, it can be added to this list in order to
242 * continue accepting this flag on the command-line, while issuing a warning
243 * and ignoring the value. Once the JDK version reaches the 'accept_until'
244 * limit, we flatly refuse to admit the existence of the flag. This allows
245 * a flag to die correctly over JDK releases using HSX.
246 * But now that HSX is no longer supported only options with a future
247 * accept_until value need to be listed, and the list can be pruned
248 * on each major release.
249 */
250 typedef struct {
251 const char* name;
252 JDK_Version obsoleted_in; // when the flag went away
253 JDK_Version accept_until; // which version to start denying the existence
254 } ObsoleteFlag;
255
256 static ObsoleteFlag obsolete_jvm_flags[] = {
257 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
258 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
259 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
260 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
261 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
262 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
263 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
264 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
265 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
266 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
267 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
268 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
269 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
270 #ifndef ZERO
271 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
272 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
273 #endif // ZERO
274 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) },
275 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) },
276 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) },
277 { "ThreadSafetyMargin", JDK_Version::jdk(9), JDK_Version::jdk(10) },
278 { NULL, JDK_Version(0), JDK_Version(0) }
279 };
280
281 // Returns true if the flag is obsolete and fits into the range specified
282 // for being ignored. In the case that the flag is ignored, the 'version'
283 // value is filled in with the version number when the flag became
284 // obsolete so that that value can be displayed to the user.
285 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
286 int i = 0;
287 assert(version != NULL, "Must provide a version buffer");
288 while (obsolete_jvm_flags[i].name != NULL) {
289 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
290 // <flag>=xxx form
291 // [-|+]<flag> form
292 size_t len = strlen(flag_status.name);
293 if ((strncmp(flag_status.name, s, len) == 0) &&
294 (strlen(s) == len)){
295 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
296 *version = flag_status.obsoleted_in;
297 return true;
298 }
299 }
300 i++;
301 }
302 return false;
303 }
304
305 // Constructs the system class path (aka boot class path) from the following
306 // components, in order:
307 //
308 // prefix // from -Xbootclasspath/p:...
309 // base // from os::get_system_properties() or -Xbootclasspath=
310 // suffix // from -Xbootclasspath/a:...
311 //
312 // This could be AllStatic, but it isn't needed after argument processing is
313 // complete.
314 class SysClassPath: public StackObj {
315 public:
316 SysClassPath(const char* base);
317 ~SysClassPath();
318
319 inline void set_base(const char* base);
320 inline void add_prefix(const char* prefix);
321 inline void add_suffix_to_prefix(const char* suffix);
322 inline void add_suffix(const char* suffix);
323 inline void reset_path(const char* base);
324
325 inline const char* get_base() const { return _items[_scp_base]; }
326 inline const char* get_prefix() const { return _items[_scp_prefix]; }
327 inline const char* get_suffix() const { return _items[_scp_suffix]; }
328
329 // Combine all the components into a single c-heap-allocated string; caller
330 // must free the string if/when no longer needed.
331 char* combined_path();
332
333 private:
334 // Utility routines.
335 static char* add_to_path(const char* path, const char* str, bool prepend);
336 static char* add_jars_to_path(char* path, const char* directory);
337
338 inline void reset_item_at(int index);
339
340 // Array indices for the items that make up the sysclasspath. All except the
341 // base are allocated in the C heap and freed by this class.
342 enum {
343 _scp_prefix, // from -Xbootclasspath/p:...
344 _scp_base, // the default sysclasspath
345 _scp_suffix, // from -Xbootclasspath/a:...
346 _scp_nitems // the number of items, must be last.
347 };
348
349 const char* _items[_scp_nitems];
350 };
351
352 SysClassPath::SysClassPath(const char* base) {
353 memset(_items, 0, sizeof(_items));
354 _items[_scp_base] = base;
355 }
356
357 SysClassPath::~SysClassPath() {
358 // Free everything except the base.
359 for (int i = 0; i < _scp_nitems; ++i) {
360 if (i != _scp_base) reset_item_at(i);
361 }
362 }
363
364 inline void SysClassPath::set_base(const char* base) {
365 _items[_scp_base] = base;
366 }
367
368 inline void SysClassPath::add_prefix(const char* prefix) {
369 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
370 }
371
372 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
373 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
374 }
375
376 inline void SysClassPath::add_suffix(const char* suffix) {
377 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
378 }
379
380 inline void SysClassPath::reset_item_at(int index) {
381 assert(index < _scp_nitems && index != _scp_base, "just checking");
382 if (_items[index] != NULL) {
383 FREE_C_HEAP_ARRAY(char, _items[index]);
384 _items[index] = NULL;
385 }
386 }
387
388 inline void SysClassPath::reset_path(const char* base) {
389 // Clear the prefix and suffix.
390 reset_item_at(_scp_prefix);
391 reset_item_at(_scp_suffix);
392 set_base(base);
393 }
394
395 //------------------------------------------------------------------------------
396
397
398 // Combine the bootclasspath elements, some of which may be null, into a single
399 // c-heap-allocated string.
400 char* SysClassPath::combined_path() {
401 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
402
403 size_t lengths[_scp_nitems];
404 size_t total_len = 0;
405
406 const char separator = *os::path_separator();
407
408 // Get the lengths.
409 int i;
410 for (i = 0; i < _scp_nitems; ++i) {
411 if (_items[i] != NULL) {
412 lengths[i] = strlen(_items[i]);
413 // Include space for the separator char (or a NULL for the last item).
414 total_len += lengths[i] + 1;
415 }
416 }
417 assert(total_len > 0, "empty sysclasspath not allowed");
418
419 // Copy the _items to a single string.
420 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
421 char* cp_tmp = cp;
422 for (i = 0; i < _scp_nitems; ++i) {
423 if (_items[i] != NULL) {
424 memcpy(cp_tmp, _items[i], lengths[i]);
425 cp_tmp += lengths[i];
426 *cp_tmp++ = separator;
427 }
428 }
429 *--cp_tmp = '\0'; // Replace the extra separator.
430 return cp;
431 }
432
433 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
434 char*
435 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
436 char *cp;
437
438 assert(str != NULL, "just checking");
439 if (path == NULL) {
440 size_t len = strlen(str) + 1;
441 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
442 memcpy(cp, str, len); // copy the trailing null
443 } else {
444 const char separator = *os::path_separator();
445 size_t old_len = strlen(path);
446 size_t str_len = strlen(str);
447 size_t len = old_len + str_len + 2;
448
449 if (prepend) {
450 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
451 char* cp_tmp = cp;
452 memcpy(cp_tmp, str, str_len);
453 cp_tmp += str_len;
454 *cp_tmp = separator;
455 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
456 FREE_C_HEAP_ARRAY(char, path);
457 } else {
458 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
459 char* cp_tmp = cp + old_len;
460 *cp_tmp = separator;
461 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
462 }
463 }
464 return cp;
465 }
466
467 // Scan the directory and append any jar or zip files found to path.
468 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
469 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
470 DIR* dir = os::opendir(directory);
471 if (dir == NULL) return path;
472
473 char dir_sep[2] = { '\0', '\0' };
474 size_t directory_len = strlen(directory);
475 const char fileSep = *os::file_separator();
476 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
477
478 /* Scan the directory for jars/zips, appending them to path. */
479 struct dirent *entry;
480 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
481 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
482 const char* name = entry->d_name;
483 const char* ext = name + strlen(name) - 4;
484 bool isJarOrZip = ext > name &&
485 (os::file_name_strcmp(ext, ".jar") == 0 ||
486 os::file_name_strcmp(ext, ".zip") == 0);
487 if (isJarOrZip) {
488 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
489 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
490 path = add_to_path(path, jarpath, false);
491 FREE_C_HEAP_ARRAY(char, jarpath);
492 }
493 }
494 FREE_C_HEAP_ARRAY(char, dbuf);
495 os::closedir(dir);
496 return path;
497 }
498
499 // Parses a memory size specification string.
500 static bool atomull(const char *s, julong* result) {
501 julong n = 0;
502 int args_read = 0;
503 bool is_hex = false;
504 // Skip leading 0[xX] for hexadecimal
505 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
506 s += 2;
507 is_hex = true;
508 args_read = sscanf(s, JULONG_FORMAT_X, &n);
509 } else {
510 args_read = sscanf(s, JULONG_FORMAT, &n);
511 }
512 if (args_read != 1) {
513 return false;
514 }
515 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
516 s++;
517 }
518 // 4705540: illegal if more characters are found after the first non-digit
519 if (strlen(s) > 1) {
520 return false;
521 }
522 switch (*s) {
523 case 'T': case 't':
524 *result = n * G * K;
525 // Check for overflow.
526 if (*result/((julong)G * K) != n) return false;
527 return true;
528 case 'G': case 'g':
529 *result = n * G;
530 if (*result/G != n) return false;
531 return true;
532 case 'M': case 'm':
533 *result = n * M;
534 if (*result/M != n) return false;
535 return true;
536 case 'K': case 'k':
537 *result = n * K;
538 if (*result/K != n) return false;
539 return true;
540 case '\0':
541 *result = n;
542 return true;
543 default:
544 return false;
545 }
546 }
547
548 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
549 if (size < min_size) return arg_too_small;
550 // Check that size will fit in a size_t (only relevant on 32-bit)
551 if (size > max_uintx) return arg_too_big;
552 return arg_in_range;
553 }
554
555 // Describe an argument out of range error
556 void Arguments::describe_range_error(ArgsRange errcode) {
557 switch(errcode) {
558 case arg_too_big:
559 jio_fprintf(defaultStream::error_stream(),
560 "The specified size exceeds the maximum "
561 "representable size.\n");
562 break;
563 case arg_too_small:
564 case arg_unreadable:
565 case arg_in_range:
566 // do nothing for now
567 break;
568 default:
569 ShouldNotReachHere();
570 }
571 }
572
573 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) {
574 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
575 return true;
576 } else {
577 return false;
578 }
579 }
580
581 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) {
582 double v;
583 if (sscanf(value, "%lf", &v) != 1) {
584 return false;
585 }
586
587 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
588 return true;
589 }
590 return false;
591 }
592
593 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) {
594 julong v;
595 int int_v;
596 intx intx_v;
597 bool is_neg = false;
598 // Check the sign first since atomull() parses only unsigned values.
599 if (*value == '-') {
600 if ((CommandLineFlags::intxAt(name, &intx_v) != Flag::SUCCESS) && (CommandLineFlags::intAt(name, &int_v) != Flag::SUCCESS)) {
601 return false;
602 }
603 value++;
604 is_neg = true;
605 }
606 if (!atomull(value, &v)) {
607 return false;
608 }
609 int_v = (int) v;
610 if (is_neg) {
611 int_v = -int_v;
612 }
613 if (CommandLineFlags::intAtPut(name, &int_v, origin) == Flag::SUCCESS) {
614 return true;
615 }
616 uint uint_v = (uint) v;
617 if (!is_neg && CommandLineFlags::uintAtPut(name, &uint_v, origin) == Flag::SUCCESS) {
618 return true;
619 }
620 intx_v = (intx) v;
621 if (is_neg) {
622 intx_v = -intx_v;
623 }
624 if (CommandLineFlags::intxAtPut(name, &intx_v, origin) == Flag::SUCCESS) {
625 return true;
626 }
627 uintx uintx_v = (uintx) v;
628 if (!is_neg && (CommandLineFlags::uintxAtPut(name, &uintx_v, origin) == Flag::SUCCESS)) {
629 return true;
630 }
631 uint64_t uint64_t_v = (uint64_t) v;
632 if (!is_neg && (CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin) == Flag::SUCCESS)) {
633 return true;
634 }
635 size_t size_t_v = (size_t) v;
636 if (!is_neg && (CommandLineFlags::size_tAtPut(name, &size_t_v, origin) == Flag::SUCCESS)) {
637 return true;
638 }
639 return false;
640 }
641
642 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) {
643 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
644 // Contract: CommandLineFlags always returns a pointer that needs freeing.
645 FREE_C_HEAP_ARRAY(char, value);
646 return true;
647 }
648
649 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) {
650 const char* old_value = "";
651 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
652 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
653 size_t new_len = strlen(new_value);
654 const char* value;
655 char* free_this_too = NULL;
656 if (old_len == 0) {
657 value = new_value;
658 } else if (new_len == 0) {
659 value = old_value;
660 } else {
661 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
662 // each new setting adds another LINE to the switch:
663 sprintf(buf, "%s\n%s", old_value, new_value);
664 value = buf;
665 free_this_too = buf;
666 }
667 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
668 // CommandLineFlags always returns a pointer that needs freeing.
669 FREE_C_HEAP_ARRAY(char, value);
670 if (free_this_too != NULL) {
671 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
672 FREE_C_HEAP_ARRAY(char, free_this_too);
673 }
674 return true;
675 }
676
677 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
678
679 // range of acceptable characters spelled out for portability reasons
680 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
681 #define BUFLEN 255
682 char name[BUFLEN+1];
683 char dummy;
684
685 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
686 return set_bool_flag(name, false, origin);
687 }
688 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
689 return set_bool_flag(name, true, origin);
690 }
691
692 char punct;
693 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
694 const char* value = strchr(arg, '=') + 1;
695 Flag* flag = Flag::find_flag(name, strlen(name));
696 if (flag != NULL && flag->is_ccstr()) {
697 if (flag->ccstr_accumulates()) {
698 return append_to_string_flag(name, value, origin);
699 } else {
700 if (value[0] == '\0') {
701 value = NULL;
702 }
703 return set_string_flag(name, value, origin);
704 }
705 }
706 }
707
708 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
709 const char* value = strchr(arg, '=') + 1;
710 // -XX:Foo:=xxx will reset the string flag to the given value.
711 if (value[0] == '\0') {
712 value = NULL;
713 }
714 return set_string_flag(name, value, origin);
715 }
716
717 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
718 #define SIGNED_NUMBER_RANGE "[-0123456789]"
719 #define NUMBER_RANGE "[0123456789]"
720 char value[BUFLEN + 1];
721 char value2[BUFLEN + 1];
722 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
723 // Looks like a floating-point number -- try again with more lenient format string
724 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
725 return set_fp_numeric_flag(name, value, origin);
726 }
727 }
728
729 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
730 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
731 return set_numeric_flag(name, value, origin);
732 }
733
734 return false;
735 }
736
737 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
738 assert(bldarray != NULL, "illegal argument");
739
740 if (arg == NULL) {
741 return;
742 }
743
744 int new_count = *count + 1;
745
746 // expand the array and add arg to the last element
747 if (*bldarray == NULL) {
748 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
749 } else {
750 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
751 }
752 (*bldarray)[*count] = os::strdup_check_oom(arg);
753 *count = new_count;
754 }
755
756 void Arguments::build_jvm_args(const char* arg) {
757 add_string(&_jvm_args_array, &_num_jvm_args, arg);
758 }
759
760 void Arguments::build_jvm_flags(const char* arg) {
761 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
762 }
763
764 // utility function to return a string that concatenates all
765 // strings in a given char** array
766 const char* Arguments::build_resource_string(char** args, int count) {
767 if (args == NULL || count == 0) {
768 return NULL;
769 }
770 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
771 for (int i = 1; i < count; i++) {
772 length += strlen(args[i]) + 1; // add 1 for a space
773 }
774 char* s = NEW_RESOURCE_ARRAY(char, length);
775 strcpy(s, args[0]);
776 for (int j = 1; j < count; j++) {
777 strcat(s, " ");
778 strcat(s, args[j]);
779 }
780 return (const char*) s;
781 }
782
783 void Arguments::print_on(outputStream* st) {
784 st->print_cr("VM Arguments:");
785 if (num_jvm_flags() > 0) {
786 st->print("jvm_flags: "); print_jvm_flags_on(st);
787 }
788 if (num_jvm_args() > 0) {
789 st->print("jvm_args: "); print_jvm_args_on(st);
790 }
791 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
792 if (_java_class_path != NULL) {
793 char* path = _java_class_path->value();
794 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
795 }
796 st->print_cr("Launcher Type: %s", _sun_java_launcher);
797 }
798
799 void Arguments::print_jvm_flags_on(outputStream* st) {
800 if (_num_jvm_flags > 0) {
801 for (int i=0; i < _num_jvm_flags; i++) {
802 st->print("%s ", _jvm_flags_array[i]);
803 }
804 st->cr();
805 }
806 }
807
808 void Arguments::print_jvm_args_on(outputStream* st) {
809 if (_num_jvm_args > 0) {
810 for (int i=0; i < _num_jvm_args; i++) {
811 st->print("%s ", _jvm_args_array[i]);
812 }
813 st->cr();
814 }
815 }
816
817 bool Arguments::process_argument(const char* arg,
818 jboolean ignore_unrecognized, Flag::Flags origin) {
819
820 JDK_Version since = JDK_Version();
821
822 if (parse_argument(arg, origin) || ignore_unrecognized) {
823 return true;
824 }
825
826 // Determine if the flag has '+', '-', or '=' characters.
827 bool has_plus_minus = (*arg == '+' || *arg == '-');
828 const char* const argname = has_plus_minus ? arg + 1 : arg;
829
830 size_t arg_len;
831 const char* equal_sign = strchr(argname, '=');
832 if (equal_sign == NULL) {
833 arg_len = strlen(argname);
834 } else {
835 arg_len = equal_sign - argname;
836 }
837
838 // Construct a string which consists only of the argument name without '+', '-', or '='.
839 char stripped_argname[256];
840 strncpy(stripped_argname, argname, arg_len);
841 stripped_argname[arg_len] = '\0'; //strncpy doesn't null terminate.
842
843 if (is_newly_obsolete(stripped_argname, &since)) {
844 char version[256];
845 since.to_string(version, sizeof(version));
846 warning("ignoring option %s; support was removed in %s", stripped_argname, version);
847 return true;
848 }
849
850 // For locked flags, report a custom error message if available.
851 // Otherwise, report the standard unrecognized VM option.
852 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
853 if (found_flag != NULL) {
854 char locked_message_buf[BUFLEN];
855 found_flag->get_locked_message(locked_message_buf, BUFLEN);
856 if (strlen(locked_message_buf) == 0) {
857 if (found_flag->is_bool() && !has_plus_minus) {
858 jio_fprintf(defaultStream::error_stream(),
859 "Missing +/- setting for VM option '%s'\n", argname);
860 } else if (!found_flag->is_bool() && has_plus_minus) {
861 jio_fprintf(defaultStream::error_stream(),
862 "Unexpected +/- setting in VM option '%s'\n", argname);
863 } else {
864 jio_fprintf(defaultStream::error_stream(),
865 "Improperly specified VM option '%s'\n", argname);
866 }
867 } else {
868 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
869 }
870 } else {
871 jio_fprintf(defaultStream::error_stream(),
872 "Unrecognized VM option '%s'\n", argname);
873 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
874 if (fuzzy_matched != NULL) {
875 jio_fprintf(defaultStream::error_stream(),
876 "Did you mean '%s%s%s'? ",
877 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
878 fuzzy_matched->_name,
879 (fuzzy_matched->is_bool()) ? "" : "=<value>");
880 }
881 }
882
883 // allow for commandline "commenting out" options like -XX:#+Verbose
884 return arg[0] == '#';
885 }
886
887 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
888 FILE* stream = fopen(file_name, "rb");
889 if (stream == NULL) {
890 if (should_exist) {
891 jio_fprintf(defaultStream::error_stream(),
892 "Could not open settings file %s\n", file_name);
893 return false;
894 } else {
895 return true;
896 }
897 }
898
899 char token[1024];
900 int pos = 0;
901
902 bool in_white_space = true;
903 bool in_comment = false;
904 bool in_quote = false;
905 char quote_c = 0;
906 bool result = true;
907
908 int c = getc(stream);
909 while(c != EOF && pos < (int)(sizeof(token)-1)) {
910 if (in_white_space) {
911 if (in_comment) {
912 if (c == '\n') in_comment = false;
913 } else {
914 if (c == '#') in_comment = true;
915 else if (!isspace(c)) {
916 in_white_space = false;
917 token[pos++] = c;
918 }
919 }
920 } else {
921 if (c == '\n' || (!in_quote && isspace(c))) {
922 // token ends at newline, or at unquoted whitespace
923 // this allows a way to include spaces in string-valued options
924 token[pos] = '\0';
925 logOption(token);
926 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
927 build_jvm_flags(token);
928 pos = 0;
929 in_white_space = true;
930 in_quote = false;
931 } else if (!in_quote && (c == '\'' || c == '"')) {
932 in_quote = true;
933 quote_c = c;
934 } else if (in_quote && (c == quote_c)) {
935 in_quote = false;
936 } else {
937 token[pos++] = c;
938 }
939 }
940 c = getc(stream);
941 }
942 if (pos > 0) {
943 token[pos] = '\0';
944 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
945 build_jvm_flags(token);
946 }
947 fclose(stream);
948 return result;
949 }
950
951 //=============================================================================================================
952 // Parsing of properties (-D)
953
954 const char* Arguments::get_property(const char* key) {
955 return PropertyList_get_value(system_properties(), key);
956 }
957
958 bool Arguments::add_property(const char* prop) {
959 const char* eq = strchr(prop, '=');
960 char* key;
961 // ns must be static--its address may be stored in a SystemProperty object.
962 const static char ns[1] = {0};
963 char* value = (char *)ns;
964
965 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
966 key = AllocateHeap(key_len + 1, mtInternal);
967 strncpy(key, prop, key_len);
968 key[key_len] = '\0';
969
970 if (eq != NULL) {
971 size_t value_len = strlen(prop) - key_len - 1;
972 value = AllocateHeap(value_len + 1, mtInternal);
973 strncpy(value, &prop[key_len + 1], value_len + 1);
974 }
975
976 if (strcmp(key, "java.compiler") == 0) {
977 process_java_compiler_argument(value);
978 FreeHeap(key);
979 if (eq != NULL) {
980 FreeHeap(value);
981 }
982 return true;
983 } else if (strcmp(key, "sun.java.command") == 0) {
984 _java_command = value;
985
986 // Record value in Arguments, but let it get passed to Java.
987 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
988 strcmp(key, "sun.java.launcher.pid") == 0) {
989 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
990 // private and are processed in process_sun_java_launcher_properties();
991 // the sun.java.launcher property is passed on to the java application
992 FreeHeap(key);
993 if (eq != NULL) {
994 FreeHeap(value);
995 }
996 return true;
997 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
998 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
999 // its value without going through the property list or making a Java call.
1000 _java_vendor_url_bug = value;
1001 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1002 PropertyList_unique_add(&_system_properties, key, value, true);
1003 return true;
1004 }
1005 // Create new property and add at the end of the list
1006 PropertyList_unique_add(&_system_properties, key, value);
1007 return true;
1008 }
1009
1010 //===========================================================================================================
1011 // Setting int/mixed/comp mode flags
1012
1013 void Arguments::set_mode_flags(Mode mode) {
1014 // Set up default values for all flags.
1015 // If you add a flag to any of the branches below,
1016 // add a default value for it here.
1017 set_java_compiler(false);
1018 _mode = mode;
1019
1020 // Ensure Agent_OnLoad has the correct initial values.
1021 // This may not be the final mode; mode may change later in onload phase.
1022 PropertyList_unique_add(&_system_properties, "java.vm.info",
1023 (char*)VM_Version::vm_info_string(), false);
1024
1025 UseInterpreter = true;
1026 UseCompiler = true;
1027 UseLoopCounter = true;
1028
1029 // Default values may be platform/compiler dependent -
1030 // use the saved values
1031 ClipInlining = Arguments::_ClipInlining;
1032 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1033 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1034 BackgroundCompilation = Arguments::_BackgroundCompilation;
1035 if (TieredCompilation) {
1036 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1037 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1038 }
1039 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1040 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1041 }
1042 }
1043
1044 // Change from defaults based on mode
1045 switch (mode) {
1046 default:
1047 ShouldNotReachHere();
1048 break;
1049 case _int:
1050 UseCompiler = false;
1051 UseLoopCounter = false;
1052 AlwaysCompileLoopMethods = false;
1053 UseOnStackReplacement = false;
1054 break;
1055 case _mixed:
1056 // same as default
1057 break;
1058 case _comp:
1059 UseInterpreter = false;
1060 BackgroundCompilation = false;
1061 ClipInlining = false;
1062 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1063 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1064 // compile a level 4 (C2) and then continue executing it.
1065 if (TieredCompilation) {
1066 Tier3InvokeNotifyFreqLog = 0;
1067 Tier4InvocationThreshold = 0;
1068 }
1069 break;
1070 }
1071 }
1072
1073 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1074 // Conflict: required to use shared spaces (-Xshare:on), but
1075 // incompatible command line options were chosen.
1076
1077 static void no_shared_spaces(const char* message) {
1078 if (RequireSharedSpaces) {
1079 jio_fprintf(defaultStream::error_stream(),
1080 "Class data sharing is inconsistent with other specified options.\n");
1081 vm_exit_during_initialization("Unable to use shared archive.", message);
1082 } else {
1083 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1084 }
1085 }
1086 #endif
1087
1088 // Returns threshold scaled with the value of scale.
1089 // If scale < 0.0, threshold is returned without scaling.
1090 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1091 if (scale == 1.0 || scale < 0.0) {
1092 return threshold;
1093 } else {
1094 return (intx)(threshold * scale);
1095 }
1096 }
1097
1098 // Returns freq_log scaled with the value of scale.
1099 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1100 // If scale < 0.0, freq_log is returned without scaling.
1101 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1102 // Check if scaling is necessary or if negative value was specified.
1103 if (scale == 1.0 || scale < 0.0) {
1104 return freq_log;
1105 }
1106 // Check values to avoid calculating log2 of 0.
1107 if (scale == 0.0 || freq_log == 0) {
1108 return 0;
1109 }
1110 // Determine the maximum notification frequency value currently supported.
1111 // The largest mask value that the interpreter/C1 can handle is
1112 // of length InvocationCounter::number_of_count_bits. Mask values are always
1113 // one bit shorter then the value of the notification frequency. Set
1114 // max_freq_bits accordingly.
1115 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1116 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1117 if (scaled_freq == 0) {
1118 // Return 0 right away to avoid calculating log2 of 0.
1119 return 0;
1120 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1121 return max_freq_bits;
1122 } else {
1123 return log2_intptr(scaled_freq);
1124 }
1125 }
1126
1127 void Arguments::set_tiered_flags() {
1128 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1129 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1130 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1131 }
1132 if (CompilationPolicyChoice < 2) {
1133 vm_exit_during_initialization(
1134 "Incompatible compilation policy selected", NULL);
1135 }
1136 // Increase the code cache size - tiered compiles a lot more.
1137 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1138 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1139 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1140 }
1141 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1142 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1143 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1144
1145 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1146 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1147 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1148 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1149 }
1150 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1151 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1152 }
1153 // Check consistency of code heap sizes
1154 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1155 jio_fprintf(defaultStream::error_stream(),
1156 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1157 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1158 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1159 vm_exit(1);
1160 }
1161 }
1162 }
1163 if (!UseInterpreter) { // -Xcomp
1164 Tier3InvokeNotifyFreqLog = 0;
1165 Tier4InvocationThreshold = 0;
1166 }
1167
1168 if (CompileThresholdScaling < 0) {
1169 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1170 }
1171
1172 // Scale tiered compilation thresholds.
1173 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1174 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1175 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1176 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1177
1178 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1179 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1180 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1181 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1182
1183 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1184 // once these thresholds become supported.
1185
1186 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1187 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1188
1189 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1190 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1191
1192 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1193
1194 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1195 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1196 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1197 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1198 }
1199 }
1200
1201 /**
1202 * Returns the minimum number of compiler threads needed to run the JVM. The following
1203 * configurations are possible.
1204 *
1205 * 1) The JVM is build using an interpreter only. As a result, the minimum number of
1206 * compiler threads is 0.
1207 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As
1208 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1.
1209 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However,
1210 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only
1211 * C1 can be used, so the minimum number of compiler threads is 1.
1212 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option
1213 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result,
1214 * the minimum number of compiler threads is 2.
1215 */
1216 int Arguments::get_min_number_of_compiler_threads() {
1217 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
1218 return 0; // case 1
1219 #else
1220 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) {
1221 return 1; // case 2 or case 3
1222 }
1223 return 2; // case 4 (tiered)
1224 #endif
1225 }
1226
1227 #if INCLUDE_ALL_GCS
1228 static void disable_adaptive_size_policy(const char* collector_name) {
1229 if (UseAdaptiveSizePolicy) {
1230 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1231 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1232 collector_name);
1233 }
1234 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1235 }
1236 }
1237
1238 void Arguments::set_parnew_gc_flags() {
1239 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1240 "control point invariant");
1241 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1242 assert(UseParNewGC, "ParNew should always be used with CMS");
1243
1244 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1245 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1246 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1247 } else if (ParallelGCThreads == 0) {
1248 jio_fprintf(defaultStream::error_stream(),
1249 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1250 vm_exit(1);
1251 }
1252
1253 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1254 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1255 // we set them to 1024 and 1024.
1256 // See CR 6362902.
1257 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1258 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1259 }
1260 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1261 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1262 }
1263
1264 // When using compressed oops, we use local overflow stacks,
1265 // rather than using a global overflow list chained through
1266 // the klass word of the object's pre-image.
1267 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1268 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1269 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1270 }
1271 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1272 }
1273 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1274 }
1275
1276 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1277 // sparc/solaris for certain applications, but would gain from
1278 // further optimization and tuning efforts, and would almost
1279 // certainly gain from analysis of platform and environment.
1280 void Arguments::set_cms_and_parnew_gc_flags() {
1281 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1282 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1283 assert(UseParNewGC, "ParNew should always be used with CMS");
1284
1285 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1286 disable_adaptive_size_policy("UseConcMarkSweepGC");
1287
1288 set_parnew_gc_flags();
1289
1290 size_t max_heap = align_size_down(MaxHeapSize,
1291 CardTableRS::ct_max_alignment_constraint());
1292
1293 // Now make adjustments for CMS
1294 intx tenuring_default = (intx)6;
1295 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1296
1297 // Preferred young gen size for "short" pauses:
1298 // upper bound depends on # of threads and NewRatio.
1299 const size_t preferred_max_new_size_unaligned =
1300 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1301 size_t preferred_max_new_size =
1302 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1303
1304 // Unless explicitly requested otherwise, size young gen
1305 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1306
1307 // If either MaxNewSize or NewRatio is set on the command line,
1308 // assume the user is trying to set the size of the young gen.
1309 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1310
1311 // Set MaxNewSize to our calculated preferred_max_new_size unless
1312 // NewSize was set on the command line and it is larger than
1313 // preferred_max_new_size.
1314 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1315 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1316 } else {
1317 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1318 }
1319 if (PrintGCDetails && Verbose) {
1320 // Too early to use gclog_or_tty
1321 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1322 }
1323
1324 // Code along this path potentially sets NewSize and OldSize
1325 if (PrintGCDetails && Verbose) {
1326 // Too early to use gclog_or_tty
1327 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1328 " initial_heap_size: " SIZE_FORMAT
1329 " max_heap: " SIZE_FORMAT,
1330 min_heap_size(), InitialHeapSize, max_heap);
1331 }
1332 size_t min_new = preferred_max_new_size;
1333 if (FLAG_IS_CMDLINE(NewSize)) {
1334 min_new = NewSize;
1335 }
1336 if (max_heap > min_new && min_heap_size() > min_new) {
1337 // Unless explicitly requested otherwise, make young gen
1338 // at least min_new, and at most preferred_max_new_size.
1339 if (FLAG_IS_DEFAULT(NewSize)) {
1340 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1341 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1342 if (PrintGCDetails && Verbose) {
1343 // Too early to use gclog_or_tty
1344 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1345 }
1346 }
1347 // Unless explicitly requested otherwise, size old gen
1348 // so it's NewRatio x of NewSize.
1349 if (FLAG_IS_DEFAULT(OldSize)) {
1350 if (max_heap > NewSize) {
1351 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1352 if (PrintGCDetails && Verbose) {
1353 // Too early to use gclog_or_tty
1354 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1355 }
1356 }
1357 }
1358 }
1359 }
1360 // Unless explicitly requested otherwise, definitely
1361 // promote all objects surviving "tenuring_default" scavenges.
1362 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1363 FLAG_IS_DEFAULT(SurvivorRatio)) {
1364 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1365 }
1366 // If we decided above (or user explicitly requested)
1367 // `promote all' (via MaxTenuringThreshold := 0),
1368 // prefer minuscule survivor spaces so as not to waste
1369 // space for (non-existent) survivors
1370 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1371 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1372 }
1373
1374 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1375 // but rather the number of free blocks of a given size that are used when
1376 // replenishing the local per-worker free list caches.
1377 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1378 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1379 // OldPLAB sizing manually turned off: Use a larger default setting,
1380 // unless it was manually specified. This is because a too-low value
1381 // will slow down scavenges.
1382 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1383 } else {
1384 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1385 }
1386 }
1387
1388 // If either of the static initialization defaults have changed, note this
1389 // modification.
1390 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1391 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1392 }
1393
1394 if (!ClassUnloading) {
1395 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1396 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1397 }
1398
1399 if (PrintGCDetails && Verbose) {
1400 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1401 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1402 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1403 }
1404 }
1405 #endif // INCLUDE_ALL_GCS
1406
1407 void set_object_alignment() {
1408 // Object alignment.
1409 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1410 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1411 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1412 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1413 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1414 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1415
1416 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1417 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1418
1419 // Oop encoding heap max
1420 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1421
1422 if (SurvivorAlignmentInBytes == 0) {
1423 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1424 }
1425
1426 #if INCLUDE_ALL_GCS
1427 // Set CMS global values
1428 CompactibleFreeListSpace::set_cms_values();
1429 #endif // INCLUDE_ALL_GCS
1430 }
1431
1432 size_t Arguments::max_heap_for_compressed_oops() {
1433 // Avoid sign flip.
1434 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1435 // We need to fit both the NULL page and the heap into the memory budget, while
1436 // keeping alignment constraints of the heap. To guarantee the latter, as the
1437 // NULL page is located before the heap, we pad the NULL page to the conservative
1438 // maximum alignment that the GC may ever impose upon the heap.
1439 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1440 _conservative_max_heap_alignment);
1441
1442 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1443 NOT_LP64(ShouldNotReachHere(); return 0);
1444 }
1445
1446 bool Arguments::should_auto_select_low_pause_collector() {
1447 if (UseAutoGCSelectPolicy &&
1448 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1449 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1450 if (PrintGCDetails) {
1451 // Cannot use gclog_or_tty yet.
1452 tty->print_cr("Automatic selection of the low pause collector"
1453 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1454 }
1455 return true;
1456 }
1457 return false;
1458 }
1459
1460 void Arguments::set_use_compressed_oops() {
1461 #ifndef ZERO
1462 #ifdef _LP64
1463 // MaxHeapSize is not set up properly at this point, but
1464 // the only value that can override MaxHeapSize if we are
1465 // to use UseCompressedOops is InitialHeapSize.
1466 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1467
1468 if (max_heap_size <= max_heap_for_compressed_oops()) {
1469 #if !defined(COMPILER1) || defined(TIERED)
1470 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1471 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1472 }
1473 #endif
1474 } else {
1475 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1476 warning("Max heap size too large for Compressed Oops");
1477 FLAG_SET_DEFAULT(UseCompressedOops, false);
1478 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1479 }
1480 }
1481 #endif // _LP64
1482 #endif // ZERO
1483 }
1484
1485
1486 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1487 // set_use_compressed_oops().
1488 void Arguments::set_use_compressed_klass_ptrs() {
1489 #ifndef ZERO
1490 #ifdef _LP64
1491 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1492 if (!UseCompressedOops) {
1493 if (UseCompressedClassPointers) {
1494 warning("UseCompressedClassPointers requires UseCompressedOops");
1495 }
1496 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1497 } else {
1498 // Turn on UseCompressedClassPointers too
1499 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1500 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1501 }
1502 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1503 if (UseCompressedClassPointers) {
1504 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1505 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1506 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1507 }
1508 }
1509 }
1510 #endif // _LP64
1511 #endif // !ZERO
1512 }
1513
1514 void Arguments::set_conservative_max_heap_alignment() {
1515 // The conservative maximum required alignment for the heap is the maximum of
1516 // the alignments imposed by several sources: any requirements from the heap
1517 // itself, the collector policy and the maximum page size we may run the VM
1518 // with.
1519 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1520 #if INCLUDE_ALL_GCS
1521 if (UseParallelGC) {
1522 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1523 } else if (UseG1GC) {
1524 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1525 }
1526 #endif // INCLUDE_ALL_GCS
1527 _conservative_max_heap_alignment = MAX4(heap_alignment,
1528 (size_t)os::vm_allocation_granularity(),
1529 os::max_page_size(),
1530 CollectorPolicy::compute_heap_alignment());
1531 }
1532
1533 void Arguments::select_gc_ergonomically() {
1534 if (os::is_server_class_machine()) {
1535 if (should_auto_select_low_pause_collector()) {
1536 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1537 } else {
1538 FLAG_SET_ERGO(bool, UseParallelGC, true);
1539 }
1540 } else {
1541 FLAG_SET_ERGO(bool, UseSerialGC, true);
1542 }
1543 }
1544
1545 void Arguments::select_gc() {
1546 if (!gc_selected()) {
1547 select_gc_ergonomically();
1548 guarantee(gc_selected(), "No GC selected");
1549 }
1550 }
1551
1552 void Arguments::set_ergonomics_flags() {
1553 select_gc();
1554
1555 #ifdef COMPILER2
1556 // Shared spaces work fine with other GCs but causes bytecode rewriting
1557 // to be disabled, which hurts interpreter performance and decreases
1558 // server performance. When -server is specified, keep the default off
1559 // unless it is asked for. Future work: either add bytecode rewriting
1560 // at link time, or rewrite bytecodes in non-shared methods.
1561 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1562 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1563 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1564 }
1565 #endif
1566
1567 set_conservative_max_heap_alignment();
1568
1569 #ifndef ZERO
1570 #ifdef _LP64
1571 set_use_compressed_oops();
1572
1573 // set_use_compressed_klass_ptrs() must be called after calling
1574 // set_use_compressed_oops().
1575 set_use_compressed_klass_ptrs();
1576
1577 // Also checks that certain machines are slower with compressed oops
1578 // in vm_version initialization code.
1579 #endif // _LP64
1580 #endif // !ZERO
1581 }
1582
1583 void Arguments::set_parallel_gc_flags() {
1584 assert(UseParallelGC || UseParallelOldGC, "Error");
1585 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1586 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1587 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1588 }
1589 FLAG_SET_DEFAULT(UseParallelGC, true);
1590
1591 // If no heap maximum was requested explicitly, use some reasonable fraction
1592 // of the physical memory, up to a maximum of 1GB.
1593 FLAG_SET_DEFAULT(ParallelGCThreads,
1594 Abstract_VM_Version::parallel_worker_threads());
1595 if (ParallelGCThreads == 0) {
1596 jio_fprintf(defaultStream::error_stream(),
1597 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1598 vm_exit(1);
1599 }
1600
1601 if (UseAdaptiveSizePolicy) {
1602 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1603 // unless the user actually sets these flags.
1604 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1605 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1606 _min_heap_free_ratio = MinHeapFreeRatio;
1607 }
1608 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1609 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1610 _max_heap_free_ratio = MaxHeapFreeRatio;
1611 }
1612 }
1613
1614 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1615 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1616 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1617 // See CR 6362902 for details.
1618 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1619 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1620 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1621 }
1622 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1623 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1624 }
1625 }
1626
1627 if (UseParallelOldGC) {
1628 // Par compact uses lower default values since they are treated as
1629 // minimums. These are different defaults because of the different
1630 // interpretation and are not ergonomically set.
1631 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1632 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1633 }
1634 }
1635 }
1636
1637 void Arguments::set_g1_gc_flags() {
1638 assert(UseG1GC, "Error");
1639 #ifdef COMPILER1
1640 FastTLABRefill = false;
1641 #endif
1642 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1643 if (ParallelGCThreads == 0) {
1644 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1645 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1646 }
1647
1648 #if INCLUDE_ALL_GCS
1649 if (G1ConcRefinementThreads == 0) {
1650 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1651 }
1652 #endif
1653
1654 // MarkStackSize will be set (if it hasn't been set by the user)
1655 // when concurrent marking is initialized.
1656 // Its value will be based upon the number of parallel marking threads.
1657 // But we do set the maximum mark stack size here.
1658 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1659 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1660 }
1661
1662 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1663 // In G1, we want the default GC overhead goal to be higher than
1664 // say in PS. So we set it here to 10%. Otherwise the heap might
1665 // be expanded more aggressively than we would like it to. In
1666 // fact, even 10% seems to not be high enough in some cases
1667 // (especially small GC stress tests that the main thing they do
1668 // is allocation). We might consider increase it further.
1669 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1670 }
1671
1672 if (PrintGCDetails && Verbose) {
1673 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1674 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1675 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1676 }
1677 }
1678
1679 #if !INCLUDE_ALL_GCS
1680 #ifdef ASSERT
1681 static bool verify_serial_gc_flags() {
1682 return (UseSerialGC &&
1683 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1684 UseParallelGC || UseParallelOldGC));
1685 }
1686 #endif // ASSERT
1687 #endif // INCLUDE_ALL_GCS
1688
1689 void Arguments::set_gc_specific_flags() {
1690 #if INCLUDE_ALL_GCS
1691 // Set per-collector flags
1692 if (UseParallelGC || UseParallelOldGC) {
1693 set_parallel_gc_flags();
1694 } else if (UseConcMarkSweepGC) {
1695 set_cms_and_parnew_gc_flags();
1696 } else if (UseG1GC) {
1697 set_g1_gc_flags();
1698 }
1699 check_deprecated_gc_flags();
1700 if (AssumeMP && !UseSerialGC) {
1701 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1702 warning("If the number of processors is expected to increase from one, then"
1703 " you should configure the number of parallel GC threads appropriately"
1704 " using -XX:ParallelGCThreads=N");
1705 }
1706 }
1707 if (MinHeapFreeRatio == 100) {
1708 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1709 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1710 }
1711 #else // INCLUDE_ALL_GCS
1712 assert(verify_serial_gc_flags(), "SerialGC unset");
1713 #endif // INCLUDE_ALL_GCS
1714 }
1715
1716 julong Arguments::limit_by_allocatable_memory(julong limit) {
1717 julong max_allocatable;
1718 julong result = limit;
1719 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1720 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1721 }
1722 return result;
1723 }
1724
1725 // Use static initialization to get the default before parsing
1726 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1727
1728 void Arguments::set_heap_size() {
1729 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1730 // Deprecated flag
1731 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1732 }
1733
1734 const julong phys_mem =
1735 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1736 : (julong)MaxRAM;
1737
1738 // If the maximum heap size has not been set with -Xmx,
1739 // then set it as fraction of the size of physical memory,
1740 // respecting the maximum and minimum sizes of the heap.
1741 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1742 julong reasonable_max = phys_mem / MaxRAMFraction;
1743
1744 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1745 // Small physical memory, so use a minimum fraction of it for the heap
1746 reasonable_max = phys_mem / MinRAMFraction;
1747 } else {
1748 // Not-small physical memory, so require a heap at least
1749 // as large as MaxHeapSize
1750 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1751 }
1752 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1753 // Limit the heap size to ErgoHeapSizeLimit
1754 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1755 }
1756 if (UseCompressedOops) {
1757 // Limit the heap size to the maximum possible when using compressed oops
1758 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1759
1760 // HeapBaseMinAddress can be greater than default but not less than.
1761 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1762 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1763 // matches compressed oops printing flags
1764 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1765 jio_fprintf(defaultStream::error_stream(),
1766 "HeapBaseMinAddress must be at least " SIZE_FORMAT
1767 " (" SIZE_FORMAT "G) which is greater than value given "
1768 SIZE_FORMAT "\n",
1769 DefaultHeapBaseMinAddress,
1770 DefaultHeapBaseMinAddress/G,
1771 HeapBaseMinAddress);
1772 }
1773 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1774 }
1775 }
1776
1777 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1778 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1779 // but it should be not less than default MaxHeapSize.
1780 max_coop_heap -= HeapBaseMinAddress;
1781 }
1782 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1783 }
1784 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1785
1786 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1787 // An initial heap size was specified on the command line,
1788 // so be sure that the maximum size is consistent. Done
1789 // after call to limit_by_allocatable_memory because that
1790 // method might reduce the allocation size.
1791 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1792 }
1793
1794 if (PrintGCDetails && Verbose) {
1795 // Cannot use gclog_or_tty yet.
1796 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1797 }
1798 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1799 }
1800
1801 // If the minimum or initial heap_size have not been set or requested to be set
1802 // ergonomically, set them accordingly.
1803 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1804 julong reasonable_minimum = (julong)(OldSize + NewSize);
1805
1806 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1807
1808 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1809
1810 if (InitialHeapSize == 0) {
1811 julong reasonable_initial = phys_mem / InitialRAMFraction;
1812
1813 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1814 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1815
1816 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1817
1818 if (PrintGCDetails && Verbose) {
1819 // Cannot use gclog_or_tty yet.
1820 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1821 }
1822 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1823 }
1824 // If the minimum heap size has not been set (via -Xms),
1825 // synchronize with InitialHeapSize to avoid errors with the default value.
1826 if (min_heap_size() == 0) {
1827 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1828 if (PrintGCDetails && Verbose) {
1829 // Cannot use gclog_or_tty yet.
1830 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1831 }
1832 }
1833 }
1834 }
1835
1836 // This must be called after ergonomics.
1837 void Arguments::set_bytecode_flags() {
1838 if (!RewriteBytecodes) {
1839 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1840 }
1841 }
1842
1843 // Aggressive optimization flags -XX:+AggressiveOpts
1844 void Arguments::set_aggressive_opts_flags() {
1845 #ifdef COMPILER2
1846 if (AggressiveUnboxing) {
1847 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1848 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1849 } else if (!EliminateAutoBox) {
1850 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1851 AggressiveUnboxing = false;
1852 }
1853 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1854 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1855 } else if (!DoEscapeAnalysis) {
1856 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1857 AggressiveUnboxing = false;
1858 }
1859 }
1860 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1861 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1862 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1863 }
1864 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1865 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1866 }
1867
1868 // Feed the cache size setting into the JDK
1869 char buffer[1024];
1870 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1871 add_property(buffer);
1872 }
1873 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1874 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1875 }
1876 #endif
1877
1878 if (AggressiveOpts) {
1879 // Sample flag setting code
1880 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1881 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1882 // }
1883 }
1884 }
1885
1886 //===========================================================================================================
1887 // Parsing of java.compiler property
1888
1889 void Arguments::process_java_compiler_argument(char* arg) {
1890 // For backwards compatibility, Djava.compiler=NONE or ""
1891 // causes us to switch to -Xint mode UNLESS -Xdebug
1892 // is also specified.
1893 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1894 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1895 }
1896 }
1897
1898 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1899 _sun_java_launcher = os::strdup_check_oom(launcher);
1900 }
1901
1902 bool Arguments::created_by_java_launcher() {
1903 assert(_sun_java_launcher != NULL, "property must have value");
1904 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1905 }
1906
1907 bool Arguments::sun_java_launcher_is_altjvm() {
1908 return _sun_java_launcher_is_altjvm;
1909 }
1910
1911 //===========================================================================================================
1912 // Parsing of main arguments
1913
1914 // check if do gclog rotation
1915 // +UseGCLogFileRotation is a must,
1916 // no gc log rotation when log file not supplied or
1917 // NumberOfGCLogFiles is 0
1918 void check_gclog_consistency() {
1919 if (UseGCLogFileRotation) {
1920 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
1921 jio_fprintf(defaultStream::output_stream(),
1922 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
1923 "where num_of_file > 0\n"
1924 "GC log rotation is turned off\n");
1925 UseGCLogFileRotation = false;
1926 }
1927 }
1928
1929 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
1930 if (FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K) == Flag::SUCCESS) {
1931 jio_fprintf(defaultStream::output_stream(),
1932 "GCLogFileSize changed to minimum 8K\n");
1933 }
1934 }
1935 }
1936
1937 // This function is called for -Xloggc:<filename>, it can be used
1938 // to check if a given file name(or string) conforms to the following
1939 // specification:
1940 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
1941 // %p and %t only allowed once. We only limit usage of filename not path
1942 bool is_filename_valid(const char *file_name) {
1943 const char* p = file_name;
1944 char file_sep = os::file_separator()[0];
1945 const char* cp;
1946 // skip prefix path
1947 for (cp = file_name; *cp != '\0'; cp++) {
1948 if (*cp == '/' || *cp == file_sep) {
1949 p = cp + 1;
1950 }
1951 }
1952
1953 int count_p = 0;
1954 int count_t = 0;
1955 while (*p != '\0') {
1956 if ((*p >= '0' && *p <= '9') ||
1957 (*p >= 'A' && *p <= 'Z') ||
1958 (*p >= 'a' && *p <= 'z') ||
1959 *p == '-' ||
1960 *p == '_' ||
1961 *p == '.') {
1962 p++;
1963 continue;
1964 }
1965 if (*p == '%') {
1966 if(*(p + 1) == 'p') {
1967 p += 2;
1968 count_p ++;
1969 continue;
1970 }
1971 if (*(p + 1) == 't') {
1972 p += 2;
1973 count_t ++;
1974 continue;
1975 }
1976 }
1977 return false;
1978 }
1979 return count_p < 2 && count_t < 2;
1980 }
1981
1982 // Check consistency of GC selection
1983 bool Arguments::check_gc_consistency() {
1984 check_gclog_consistency();
1985 // Ensure that the user has not selected conflicting sets
1986 // of collectors.
1987 uint i = 0;
1988 if (UseSerialGC) i++;
1989 if (UseConcMarkSweepGC) i++;
1990 if (UseParallelGC || UseParallelOldGC) i++;
1991 if (UseG1GC) i++;
1992 if (i > 1) {
1993 jio_fprintf(defaultStream::error_stream(),
1994 "Conflicting collector combinations in option list; "
1995 "please refer to the release notes for the combinations "
1996 "allowed\n");
1997 return false;
1998 }
1999
2000 if (UseConcMarkSweepGC && !UseParNewGC) {
2001 jio_fprintf(defaultStream::error_stream(),
2002 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2003 return false;
2004 }
2005
2006 if (UseParNewGC && !UseConcMarkSweepGC) {
2007 jio_fprintf(defaultStream::error_stream(),
2008 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2009 return false;
2010 }
2011
2012 return true;
2013 }
2014
2015 void Arguments::check_deprecated_gc_flags() {
2016 if (FLAG_IS_CMDLINE(UseParNewGC)) {
2017 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release");
2018 }
2019 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
2020 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
2021 "and will likely be removed in future release");
2022 }
2023 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
2024 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
2025 "Use MaxRAMFraction instead.");
2026 }
2027 }
2028
2029 // Check the consistency of vm_init_args
2030 bool Arguments::check_vm_args_consistency() {
2031 // Method for adding checks for flag consistency.
2032 // The intent is to warn the user of all possible conflicts,
2033 // before returning an error.
2034 // Note: Needs platform-dependent factoring.
2035 bool status = true;
2036
2037 if (TLABRefillWasteFraction == 0) {
2038 jio_fprintf(defaultStream::error_stream(),
2039 "TLABRefillWasteFraction should be a denominator, "
2040 "not " SIZE_FORMAT "\n",
2041 TLABRefillWasteFraction);
2042 status = false;
2043 }
2044
2045 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2046 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2047 }
2048
2049 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2050 // Settings to encourage splitting.
2051 if (!FLAG_IS_CMDLINE(NewRatio)) {
2052 if (FLAG_SET_CMDLINE(uintx, NewRatio, 2) != Flag::SUCCESS) {
2053 status = false;
2054 }
2055 }
2056 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2057 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2058 status = false;
2059 }
2060 }
2061 }
2062
2063 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2064 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2065 }
2066
2067 if (GCTimeLimit == 100) {
2068 // Turn off gc-overhead-limit-exceeded checks
2069 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2070 }
2071
2072 status = status && check_gc_consistency();
2073
2074 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2075 // insists that we hold the requisite locks so that the iteration is
2076 // MT-safe. For the verification at start-up and shut-down, we don't
2077 // yet have a good way of acquiring and releasing these locks,
2078 // which are not visible at the CollectedHeap level. We want to
2079 // be able to acquire these locks and then do the iteration rather
2080 // than just disable the lock verification. This will be fixed under
2081 // bug 4788986.
2082 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2083 if (VerifyDuringStartup) {
2084 warning("Heap verification at start-up disabled "
2085 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2086 VerifyDuringStartup = false; // Disable verification at start-up
2087 }
2088
2089 if (VerifyBeforeExit) {
2090 warning("Heap verification at shutdown disabled "
2091 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2092 VerifyBeforeExit = false; // Disable verification at shutdown
2093 }
2094 }
2095
2096 // Note: only executed in non-PRODUCT mode
2097 if (!UseAsyncConcMarkSweepGC &&
2098 (ExplicitGCInvokesConcurrent ||
2099 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2100 jio_fprintf(defaultStream::error_stream(),
2101 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2102 " with -UseAsyncConcMarkSweepGC");
2103 status = false;
2104 }
2105
2106 if (PrintNMTStatistics) {
2107 #if INCLUDE_NMT
2108 if (MemTracker::tracking_level() == NMT_off) {
2109 #endif // INCLUDE_NMT
2110 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2111 PrintNMTStatistics = false;
2112 #if INCLUDE_NMT
2113 }
2114 #endif
2115 }
2116
2117 // Check lower bounds of the code cache
2118 // Template Interpreter code is approximately 3X larger in debug builds.
2119 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2120 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2121 jio_fprintf(defaultStream::error_stream(),
2122 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2123 os::vm_page_size()/K);
2124 status = false;
2125 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2126 jio_fprintf(defaultStream::error_stream(),
2127 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2128 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2129 status = false;
2130 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2131 jio_fprintf(defaultStream::error_stream(),
2132 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2133 min_code_cache_size/K);
2134 status = false;
2135 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2136 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2137 jio_fprintf(defaultStream::error_stream(),
2138 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2139 CODE_CACHE_SIZE_LIMIT/M);
2140 status = false;
2141 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2142 jio_fprintf(defaultStream::error_stream(),
2143 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2144 min_code_cache_size/K);
2145 status = false;
2146 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2147 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2148 jio_fprintf(defaultStream::error_stream(),
2149 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2150 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2151 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2152 status = false;
2153 }
2154
2155 int min_number_of_compiler_threads = get_min_number_of_compiler_threads();
2156 // The default CICompilerCount's value is CI_COMPILER_COUNT.
2157 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number");
2158
2159 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2160 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2161 }
2162
2163 return status;
2164 }
2165
2166 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2167 const char* option_type) {
2168 if (ignore) return false;
2169
2170 const char* spacer = " ";
2171 if (option_type == NULL) {
2172 option_type = ++spacer; // Set both to the empty string.
2173 }
2174
2175 if (os::obsolete_option(option)) {
2176 jio_fprintf(defaultStream::error_stream(),
2177 "Obsolete %s%soption: %s\n", option_type, spacer,
2178 option->optionString);
2179 return false;
2180 } else {
2181 jio_fprintf(defaultStream::error_stream(),
2182 "Unrecognized %s%soption: %s\n", option_type, spacer,
2183 option->optionString);
2184 return true;
2185 }
2186 }
2187
2188 static const char* user_assertion_options[] = {
2189 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2190 };
2191
2192 static const char* system_assertion_options[] = {
2193 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2194 };
2195
2196 bool Arguments::parse_uintx(const char* value,
2197 uintx* uintx_arg,
2198 uintx min_size) {
2199
2200 // Check the sign first since atomull() parses only unsigned values.
2201 bool value_is_positive = !(*value == '-');
2202
2203 if (value_is_positive) {
2204 julong n;
2205 bool good_return = atomull(value, &n);
2206 if (good_return) {
2207 bool above_minimum = n >= min_size;
2208 bool value_is_too_large = n > max_uintx;
2209
2210 if (above_minimum && !value_is_too_large) {
2211 *uintx_arg = n;
2212 return true;
2213 }
2214 }
2215 }
2216 return false;
2217 }
2218
2219 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2220 julong* long_arg,
2221 julong min_size) {
2222 if (!atomull(s, long_arg)) return arg_unreadable;
2223 return check_memory_size(*long_arg, min_size);
2224 }
2225
2226 // Parse JavaVMInitArgs structure
2227
2228 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2229 // For components of the system classpath.
2230 SysClassPath scp(Arguments::get_sysclasspath());
2231 bool scp_assembly_required = false;
2232
2233 // Save default settings for some mode flags
2234 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2235 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2236 Arguments::_ClipInlining = ClipInlining;
2237 Arguments::_BackgroundCompilation = BackgroundCompilation;
2238 if (TieredCompilation) {
2239 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2240 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2241 }
2242
2243 // Setup flags for mixed which is the default
2244 set_mode_flags(_mixed);
2245
2246 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2247 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2248 if (result != JNI_OK) {
2249 return result;
2250 }
2251
2252 // Parse JavaVMInitArgs structure passed in
2253 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE);
2254 if (result != JNI_OK) {
2255 return result;
2256 }
2257
2258 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2259 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2260 if (result != JNI_OK) {
2261 return result;
2262 }
2263
2264 // Do final processing now that all arguments have been parsed
2265 result = finalize_vm_init_args(&scp, scp_assembly_required);
2266 if (result != JNI_OK) {
2267 return result;
2268 }
2269
2270 return JNI_OK;
2271 }
2272
2273 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2274 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2275 // are dealing with -agentpath (case where name is a path), otherwise with
2276 // -agentlib
2277 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2278 char *_name;
2279 const char *_hprof = "hprof", *_jdwp = "jdwp";
2280 size_t _len_hprof, _len_jdwp, _len_prefix;
2281
2282 if (is_path) {
2283 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2284 return false;
2285 }
2286
2287 _name++; // skip past last path separator
2288 _len_prefix = strlen(JNI_LIB_PREFIX);
2289
2290 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2291 return false;
2292 }
2293
2294 _name += _len_prefix;
2295 _len_hprof = strlen(_hprof);
2296 _len_jdwp = strlen(_jdwp);
2297
2298 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2299 _name += _len_hprof;
2300 }
2301 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2302 _name += _len_jdwp;
2303 }
2304 else {
2305 return false;
2306 }
2307
2308 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2309 return false;
2310 }
2311
2312 return true;
2313 }
2314
2315 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2316 return true;
2317 }
2318
2319 return false;
2320 }
2321
2322 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2323 SysClassPath* scp_p,
2324 bool* scp_assembly_required_p,
2325 Flag::Flags origin) {
2326 // Remaining part of option string
2327 const char* tail;
2328
2329 // iterate over arguments
2330 for (int index = 0; index < args->nOptions; index++) {
2331 bool is_absolute_path = false; // for -agentpath vs -agentlib
2332
2333 const JavaVMOption* option = args->options + index;
2334
2335 if (!match_option(option, "-Djava.class.path", &tail) &&
2336 !match_option(option, "-Dsun.java.command", &tail) &&
2337 !match_option(option, "-Dsun.java.launcher", &tail)) {
2338
2339 // add all jvm options to the jvm_args string. This string
2340 // is used later to set the java.vm.args PerfData string constant.
2341 // the -Djava.class.path and the -Dsun.java.command options are
2342 // omitted from jvm_args string as each have their own PerfData
2343 // string constant object.
2344 build_jvm_args(option->optionString);
2345 }
2346
2347 // -verbose:[class/gc/jni]
2348 if (match_option(option, "-verbose", &tail)) {
2349 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2350 if (FLAG_SET_CMDLINE(bool, TraceClassLoading, true) != Flag::SUCCESS) {
2351 return JNI_EINVAL;
2352 }
2353 if (FLAG_SET_CMDLINE(bool, TraceClassUnloading, true) != Flag::SUCCESS) {
2354 return JNI_EINVAL;
2355 }
2356 } else if (!strcmp(tail, ":gc")) {
2357 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
2358 return JNI_EINVAL;
2359 }
2360 } else if (!strcmp(tail, ":jni")) {
2361 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2362 return JNI_EINVAL;
2363 }
2364 }
2365 // -da / -ea / -disableassertions / -enableassertions
2366 // These accept an optional class/package name separated by a colon, e.g.,
2367 // -da:java.lang.Thread.
2368 } else if (match_option(option, user_assertion_options, &tail, true)) {
2369 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2370 if (*tail == '\0') {
2371 JavaAssertions::setUserClassDefault(enable);
2372 } else {
2373 assert(*tail == ':', "bogus match by match_option()");
2374 JavaAssertions::addOption(tail + 1, enable);
2375 }
2376 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2377 } else if (match_option(option, system_assertion_options, &tail, false)) {
2378 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2379 JavaAssertions::setSystemClassDefault(enable);
2380 // -bootclasspath:
2381 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2382 scp_p->reset_path(tail);
2383 *scp_assembly_required_p = true;
2384 // -bootclasspath/a:
2385 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2386 scp_p->add_suffix(tail);
2387 *scp_assembly_required_p = true;
2388 // -bootclasspath/p:
2389 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2390 scp_p->add_prefix(tail);
2391 *scp_assembly_required_p = true;
2392 // -Xrun
2393 } else if (match_option(option, "-Xrun", &tail)) {
2394 if (tail != NULL) {
2395 const char* pos = strchr(tail, ':');
2396 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2397 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2398 name[len] = '\0';
2399
2400 char *options = NULL;
2401 if(pos != NULL) {
2402 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2403 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2404 }
2405 #if !INCLUDE_JVMTI
2406 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2407 jio_fprintf(defaultStream::error_stream(),
2408 "Profiling and debugging agents are not supported in this VM\n");
2409 return JNI_ERR;
2410 }
2411 #endif // !INCLUDE_JVMTI
2412 add_init_library(name, options);
2413 }
2414 // -agentlib and -agentpath
2415 } else if (match_option(option, "-agentlib:", &tail) ||
2416 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2417 if(tail != NULL) {
2418 const char* pos = strchr(tail, '=');
2419 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2420 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2421 name[len] = '\0';
2422
2423 char *options = NULL;
2424 if(pos != NULL) {
2425 options = os::strdup_check_oom(pos + 1, mtInternal);
2426 }
2427 #if !INCLUDE_JVMTI
2428 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2429 jio_fprintf(defaultStream::error_stream(),
2430 "Profiling and debugging agents are not supported in this VM\n");
2431 return JNI_ERR;
2432 }
2433 #endif // !INCLUDE_JVMTI
2434 add_init_agent(name, options, is_absolute_path);
2435 }
2436 // -javaagent
2437 } else if (match_option(option, "-javaagent:", &tail)) {
2438 #if !INCLUDE_JVMTI
2439 jio_fprintf(defaultStream::error_stream(),
2440 "Instrumentation agents are not supported in this VM\n");
2441 return JNI_ERR;
2442 #else
2443 if(tail != NULL) {
2444 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2445 add_init_agent("instrument", options, false);
2446 }
2447 #endif // !INCLUDE_JVMTI
2448 // -Xnoclassgc
2449 } else if (match_option(option, "-Xnoclassgc")) {
2450 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2451 return JNI_EINVAL;
2452 }
2453 // -Xconcgc
2454 } else if (match_option(option, "-Xconcgc")) {
2455 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2456 return JNI_EINVAL;
2457 }
2458 // -Xnoconcgc
2459 } else if (match_option(option, "-Xnoconcgc")) {
2460 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2461 return JNI_EINVAL;
2462 }
2463 // -Xbatch
2464 } else if (match_option(option, "-Xbatch")) {
2465 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2466 return JNI_EINVAL;
2467 }
2468 // -Xmn for compatibility with other JVM vendors
2469 } else if (match_option(option, "-Xmn", &tail)) {
2470 julong long_initial_young_size = 0;
2471 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2472 if (errcode != arg_in_range) {
2473 jio_fprintf(defaultStream::error_stream(),
2474 "Invalid initial young generation size: %s\n", option->optionString);
2475 describe_range_error(errcode);
2476 return JNI_EINVAL;
2477 }
2478 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2479 return JNI_EINVAL;
2480 }
2481 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2482 return JNI_EINVAL;
2483 }
2484 // -Xms
2485 } else if (match_option(option, "-Xms", &tail)) {
2486 julong long_initial_heap_size = 0;
2487 // an initial heap size of 0 means automatically determine
2488 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2489 if (errcode != arg_in_range) {
2490 jio_fprintf(defaultStream::error_stream(),
2491 "Invalid initial heap size: %s\n", option->optionString);
2492 describe_range_error(errcode);
2493 return JNI_EINVAL;
2494 }
2495 set_min_heap_size((size_t)long_initial_heap_size);
2496 // Currently the minimum size and the initial heap sizes are the same.
2497 // Can be overridden with -XX:InitialHeapSize.
2498 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2499 return JNI_EINVAL;
2500 }
2501 // -Xmx
2502 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2503 julong long_max_heap_size = 0;
2504 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2505 if (errcode != arg_in_range) {
2506 jio_fprintf(defaultStream::error_stream(),
2507 "Invalid maximum heap size: %s\n", option->optionString);
2508 describe_range_error(errcode);
2509 return JNI_EINVAL;
2510 }
2511 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2512 return JNI_EINVAL;
2513 }
2514 // Xmaxf
2515 } else if (match_option(option, "-Xmaxf", &tail)) {
2516 char* err;
2517 int maxf = (int)(strtod(tail, &err) * 100);
2518 if (*err != '\0' || *tail == '\0') {
2519 jio_fprintf(defaultStream::error_stream(),
2520 "Bad max heap free percentage size: %s\n",
2521 option->optionString);
2522 return JNI_EINVAL;
2523 } else {
2524 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2525 return JNI_EINVAL;
2526 }
2527 }
2528 // Xminf
2529 } else if (match_option(option, "-Xminf", &tail)) {
2530 char* err;
2531 int minf = (int)(strtod(tail, &err) * 100);
2532 if (*err != '\0' || *tail == '\0') {
2533 jio_fprintf(defaultStream::error_stream(),
2534 "Bad min heap free percentage size: %s\n",
2535 option->optionString);
2536 return JNI_EINVAL;
2537 } else {
2538 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2539 return JNI_EINVAL;
2540 }
2541 }
2542 // -Xss
2543 } else if (match_option(option, "-Xss", &tail)) {
2544 julong long_ThreadStackSize = 0;
2545 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2546 if (errcode != arg_in_range) {
2547 jio_fprintf(defaultStream::error_stream(),
2548 "Invalid thread stack size: %s\n", option->optionString);
2549 describe_range_error(errcode);
2550 return JNI_EINVAL;
2551 }
2552 // Internally track ThreadStackSize in units of 1024 bytes.
2553 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2554 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2555 return JNI_EINVAL;
2556 }
2557 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads
2558 } else if (match_option(option, "-Xoss", &tail) ||
2559 match_option(option, "-Xsqnopause") ||
2560 match_option(option, "-Xoptimize") ||
2561 match_option(option, "-Xboundthreads")) {
2562 // All these options are deprecated in JDK 9 and will be removed in a future release
2563 warning("Option %s was deprecated in version 9.0 and will likely be removed in a future release.",
2564 option->optionString);
2565 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2566 julong long_CodeCacheExpansionSize = 0;
2567 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2568 if (errcode != arg_in_range) {
2569 jio_fprintf(defaultStream::error_stream(),
2570 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2571 os::vm_page_size()/K);
2572 return JNI_EINVAL;
2573 }
2574 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2575 return JNI_EINVAL;
2576 }
2577 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2578 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2579 julong long_ReservedCodeCacheSize = 0;
2580
2581 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2582 if (errcode != arg_in_range) {
2583 jio_fprintf(defaultStream::error_stream(),
2584 "Invalid maximum code cache size: %s.\n", option->optionString);
2585 return JNI_EINVAL;
2586 }
2587 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2588 return JNI_EINVAL;
2589 }
2590 // -XX:NonNMethodCodeHeapSize=
2591 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2592 julong long_NonNMethodCodeHeapSize = 0;
2593
2594 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2595 if (errcode != arg_in_range) {
2596 jio_fprintf(defaultStream::error_stream(),
2597 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2598 return JNI_EINVAL;
2599 }
2600 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2601 return JNI_EINVAL;
2602 }
2603 // -XX:ProfiledCodeHeapSize=
2604 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2605 julong long_ProfiledCodeHeapSize = 0;
2606
2607 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2608 if (errcode != arg_in_range) {
2609 jio_fprintf(defaultStream::error_stream(),
2610 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2611 return JNI_EINVAL;
2612 }
2613 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
2614 return JNI_EINVAL;
2615 }
2616 // -XX:NonProfiledCodeHeapSizee=
2617 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2618 julong long_NonProfiledCodeHeapSize = 0;
2619
2620 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2621 if (errcode != arg_in_range) {
2622 jio_fprintf(defaultStream::error_stream(),
2623 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2624 return JNI_EINVAL;
2625 }
2626 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
2627 return JNI_EINVAL;
2628 }
2629 // -green
2630 } else if (match_option(option, "-green")) {
2631 jio_fprintf(defaultStream::error_stream(),
2632 "Green threads support not available\n");
2633 return JNI_EINVAL;
2634 // -native
2635 } else if (match_option(option, "-native")) {
2636 // HotSpot always uses native threads, ignore silently for compatibility
2637 // -Xrs
2638 } else if (match_option(option, "-Xrs")) {
2639 // Classic/EVM option, new functionality
2640 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2641 return JNI_EINVAL;
2642 }
2643 } else if (match_option(option, "-Xusealtsigs")) {
2644 // change default internal VM signals used - lower case for back compat
2645 if (FLAG_SET_CMDLINE(bool, UseAltSigs, true) != Flag::SUCCESS) {
2646 return JNI_EINVAL;
2647 }
2648 // -Xprof
2649 } else if (match_option(option, "-Xprof")) {
2650 #if INCLUDE_FPROF
2651 _has_profile = true;
2652 #else // INCLUDE_FPROF
2653 jio_fprintf(defaultStream::error_stream(),
2654 "Flat profiling is not supported in this VM.\n");
2655 return JNI_ERR;
2656 #endif // INCLUDE_FPROF
2657 // -Xconcurrentio
2658 } else if (match_option(option, "-Xconcurrentio")) {
2659 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2660 return JNI_EINVAL;
2661 }
2662 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2663 return JNI_EINVAL;
2664 }
2665 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2666 return JNI_EINVAL;
2667 }
2668 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2669 return JNI_EINVAL;
2670 }
2671 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2672 return JNI_EINVAL;
2673 }
2674
2675 // -Xinternalversion
2676 } else if (match_option(option, "-Xinternalversion")) {
2677 jio_fprintf(defaultStream::output_stream(), "%s\n",
2678 VM_Version::internal_vm_info_string());
2679 vm_exit(0);
2680 #ifndef PRODUCT
2681 // -Xprintflags
2682 } else if (match_option(option, "-Xprintflags")) {
2683 CommandLineFlags::printFlags(tty, false);
2684 vm_exit(0);
2685 #endif
2686 // -D
2687 } else if (match_option(option, "-D", &tail)) {
2688 const char* value;
2689 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2690 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2691 // abort if -Djava.endorsed.dirs is set
2692 jio_fprintf(defaultStream::output_stream(),
2693 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2694 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2695 return JNI_EINVAL;
2696 }
2697 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2698 *value != '\0' && strcmp(value, "\"\"") != 0) {
2699 // abort if -Djava.ext.dirs is set
2700 jio_fprintf(defaultStream::output_stream(),
2701 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2702 return JNI_EINVAL;
2703 }
2704
2705 if (!add_property(tail)) {
2706 return JNI_ENOMEM;
2707 }
2708 // Out of the box management support
2709 if (match_option(option, "-Dcom.sun.management", &tail)) {
2710 #if INCLUDE_MANAGEMENT
2711 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
2712 return JNI_EINVAL;
2713 }
2714 #else
2715 jio_fprintf(defaultStream::output_stream(),
2716 "-Dcom.sun.management is not supported in this VM.\n");
2717 return JNI_ERR;
2718 #endif
2719 }
2720 // -Xint
2721 } else if (match_option(option, "-Xint")) {
2722 set_mode_flags(_int);
2723 // -Xmixed
2724 } else if (match_option(option, "-Xmixed")) {
2725 set_mode_flags(_mixed);
2726 // -Xcomp
2727 } else if (match_option(option, "-Xcomp")) {
2728 // for testing the compiler; turn off all flags that inhibit compilation
2729 set_mode_flags(_comp);
2730 // -Xshare:dump
2731 } else if (match_option(option, "-Xshare:dump")) {
2732 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
2733 return JNI_EINVAL;
2734 }
2735 set_mode_flags(_int); // Prevent compilation, which creates objects
2736 // -Xshare:on
2737 } else if (match_option(option, "-Xshare:on")) {
2738 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2739 return JNI_EINVAL;
2740 }
2741 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
2742 return JNI_EINVAL;
2743 }
2744 // -Xshare:auto
2745 } else if (match_option(option, "-Xshare:auto")) {
2746 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
2747 return JNI_EINVAL;
2748 }
2749 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2750 return JNI_EINVAL;
2751 }
2752 // -Xshare:off
2753 } else if (match_option(option, "-Xshare:off")) {
2754 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
2755 return JNI_EINVAL;
2756 }
2757 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
2758 return JNI_EINVAL;
2759 }
2760 // -Xverify
2761 } else if (match_option(option, "-Xverify", &tail)) {
2762 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2763 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
2764 return JNI_EINVAL;
2765 }
2766 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
2767 return JNI_EINVAL;
2768 }
2769 } else if (strcmp(tail, ":remote") == 0) {
2770 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
2771 return JNI_EINVAL;
2772 }
2773 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
2774 return JNI_EINVAL;
2775 }
2776 } else if (strcmp(tail, ":none") == 0) {
2777 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
2778 return JNI_EINVAL;
2779 }
2780 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
2781 return JNI_EINVAL;
2782 }
2783 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2784 return JNI_EINVAL;
2785 }
2786 // -Xdebug
2787 } else if (match_option(option, "-Xdebug")) {
2788 // note this flag has been used, then ignore
2789 set_xdebug_mode(true);
2790 // -Xnoagent
2791 } else if (match_option(option, "-Xnoagent")) {
2792 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2793 } else if (match_option(option, "-Xloggc:", &tail)) {
2794 // Redirect GC output to the file. -Xloggc:<filename>
2795 // ostream_init_log(), when called will use this filename
2796 // to initialize a fileStream.
2797 _gc_log_filename = os::strdup_check_oom(tail);
2798 if (!is_filename_valid(_gc_log_filename)) {
2799 jio_fprintf(defaultStream::output_stream(),
2800 "Invalid file name for use with -Xloggc: Filename can only contain the "
2801 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
2802 "Note %%p or %%t can only be used once\n", _gc_log_filename);
2803 return JNI_EINVAL;
2804 }
2805 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
2806 return JNI_EINVAL;
2807 }
2808 if (FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true) != Flag::SUCCESS) {
2809 return JNI_EINVAL;
2810 }
2811 // JNI hooks
2812 } else if (match_option(option, "-Xcheck", &tail)) {
2813 if (!strcmp(tail, ":jni")) {
2814 #if !INCLUDE_JNI_CHECK
2815 warning("JNI CHECKING is not supported in this VM");
2816 #else
2817 CheckJNICalls = true;
2818 #endif // INCLUDE_JNI_CHECK
2819 } else if (is_bad_option(option, args->ignoreUnrecognized,
2820 "check")) {
2821 return JNI_EINVAL;
2822 }
2823 } else if (match_option(option, "vfprintf")) {
2824 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2825 } else if (match_option(option, "exit")) {
2826 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2827 } else if (match_option(option, "abort")) {
2828 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2829 // -XX:+AggressiveHeap
2830 } else if (match_option(option, "-XX:+AggressiveHeap")) {
2831
2832 // This option inspects the machine and attempts to set various
2833 // parameters to be optimal for long-running, memory allocation
2834 // intensive jobs. It is intended for machines with large
2835 // amounts of cpu and memory.
2836
2837 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2838 // VM, but we may not be able to represent the total physical memory
2839 // available (like having 8gb of memory on a box but using a 32bit VM).
2840 // Thus, we need to make sure we're using a julong for intermediate
2841 // calculations.
2842 julong initHeapSize;
2843 julong total_memory = os::physical_memory();
2844
2845 if (total_memory < (julong)256*M) {
2846 jio_fprintf(defaultStream::error_stream(),
2847 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2848 vm_exit(1);
2849 }
2850
2851 // The heap size is half of available memory, or (at most)
2852 // all of possible memory less 160mb (leaving room for the OS
2853 // when using ISM). This is the maximum; because adaptive sizing
2854 // is turned on below, the actual space used may be smaller.
2855
2856 initHeapSize = MIN2(total_memory / (julong)2,
2857 total_memory - (julong)160*M);
2858
2859 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2860
2861 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2862 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2863 return JNI_EINVAL;
2864 }
2865 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2866 return JNI_EINVAL;
2867 }
2868 // Currently the minimum size and the initial heap sizes are the same.
2869 set_min_heap_size(initHeapSize);
2870 }
2871 if (FLAG_IS_DEFAULT(NewSize)) {
2872 // Make the young generation 3/8ths of the total heap.
2873 if (FLAG_SET_CMDLINE(size_t, NewSize,
2874 ((julong)MaxHeapSize / (julong)8) * (julong)3) != Flag::SUCCESS) {
2875 return JNI_EINVAL;
2876 }
2877 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2878 return JNI_EINVAL;
2879 }
2880 }
2881
2882 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2883 FLAG_SET_DEFAULT(UseLargePages, true);
2884 #endif
2885
2886 // Increase some data structure sizes for efficiency
2887 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2888 return JNI_EINVAL;
2889 }
2890 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2891 return JNI_EINVAL;
2892 }
2893 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256*K) != Flag::SUCCESS) {
2894 return JNI_EINVAL;
2895 }
2896
2897 // See the OldPLABSize comment below, but replace 'after promotion'
2898 // with 'after copying'. YoungPLABSize is the size of the survivor
2899 // space per-gc-thread buffers. The default is 4kw.
2900 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K) != Flag::SUCCESS) { // Note: this is in words
2901 return JNI_EINVAL;
2902 }
2903
2904 // OldPLABSize is the size of the buffers in the old gen that
2905 // UseParallelGC uses to promote live data that doesn't fit in the
2906 // survivor spaces. At any given time, there's one for each gc thread.
2907 // The default size is 1kw. These buffers are rarely used, since the
2908 // survivor spaces are usually big enough. For specjbb, however, there
2909 // are occasions when there's lots of live data in the young gen
2910 // and we end up promoting some of it. We don't have a definite
2911 // explanation for why bumping OldPLABSize helps, but the theory
2912 // is that a bigger PLAB results in retaining something like the
2913 // original allocation order after promotion, which improves mutator
2914 // locality. A minor effect may be that larger PLABs reduce the
2915 // number of PLAB allocation events during gc. The value of 8kw
2916 // was arrived at by experimenting with specjbb.
2917 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K) != Flag::SUCCESS) { // Note: this is in words
2918 return JNI_EINVAL;
2919 }
2920
2921 // Enable parallel GC and adaptive generation sizing
2922 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2923 return JNI_EINVAL;
2924 }
2925 FLAG_SET_DEFAULT(ParallelGCThreads,
2926 Abstract_VM_Version::parallel_worker_threads());
2927
2928 // Encourage steady state memory management
2929 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2930 return JNI_EINVAL;
2931 }
2932
2933 // This appears to improve mutator locality
2934 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2935 return JNI_EINVAL;
2936 }
2937
2938 // Get around early Solaris scheduling bug
2939 // (affinity vs other jobs on system)
2940 // but disallow DR and offlining (5008695).
2941 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2942 return JNI_EINVAL;
2943 }
2944
2945 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
2946 // and the last option wins.
2947 } else if (match_option(option, "-XX:+NeverTenure")) {
2948 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
2949 return JNI_EINVAL;
2950 }
2951 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
2952 return JNI_EINVAL;
2953 }
2954 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
2955 return JNI_EINVAL;
2956 }
2957 } else if (match_option(option, "-XX:+AlwaysTenure")) {
2958 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
2959 return JNI_EINVAL;
2960 }
2961 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
2962 return JNI_EINVAL;
2963 }
2964 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
2965 return JNI_EINVAL;
2966 }
2967 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
2968 uintx max_tenuring_thresh = 0;
2969 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
2970 jio_fprintf(defaultStream::error_stream(),
2971 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
2972 return JNI_EINVAL;
2973 }
2974
2975 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
2976 return JNI_EINVAL;
2977 }
2978
2979 if (MaxTenuringThreshold == 0) {
2980 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
2981 return JNI_EINVAL;
2982 }
2983 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
2984 return JNI_EINVAL;
2985 }
2986 } else {
2987 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
2988 return JNI_EINVAL;
2989 }
2990 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
2991 return JNI_EINVAL;
2992 }
2993 }
2994 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
2995 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
2996 return JNI_EINVAL;
2997 }
2998 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
2999 return JNI_EINVAL;
3000 }
3001 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3002 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3003 return JNI_EINVAL;
3004 }
3005 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3006 return JNI_EINVAL;
3007 }
3008 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3009 #if defined(DTRACE_ENABLED)
3010 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3011 return JNI_EINVAL;
3012 }
3013 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3014 return JNI_EINVAL;
3015 }
3016 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3017 return JNI_EINVAL;
3018 }
3019 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3020 return JNI_EINVAL;
3021 }
3022 #else // defined(DTRACE_ENABLED)
3023 jio_fprintf(defaultStream::error_stream(),
3024 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3025 return JNI_EINVAL;
3026 #endif // defined(DTRACE_ENABLED)
3027 #ifdef ASSERT
3028 } else if (match_option(option, "-XX:+FullGCALot")) {
3029 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3030 return JNI_EINVAL;
3031 }
3032 // disable scavenge before parallel mark-compact
3033 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3034 return JNI_EINVAL;
3035 }
3036 #endif
3037 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3038 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3039 julong stack_size = 0;
3040 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3041 if (errcode != arg_in_range) {
3042 jio_fprintf(defaultStream::error_stream(),
3043 "Invalid mark stack size: %s\n", option->optionString);
3044 describe_range_error(errcode);
3045 return JNI_EINVAL;
3046 }
3047 jio_fprintf(defaultStream::error_stream(),
3048 "Please use -XX:MarkStackSize in place of "
3049 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n");
3050 if (FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size) != Flag::SUCCESS) {
3051 return JNI_EINVAL;
3052 }
3053 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3054 julong max_stack_size = 0;
3055 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3056 if (errcode != arg_in_range) {
3057 jio_fprintf(defaultStream::error_stream(),
3058 "Invalid maximum mark stack size: %s\n",
3059 option->optionString);
3060 describe_range_error(errcode);
3061 return JNI_EINVAL;
3062 }
3063 jio_fprintf(defaultStream::error_stream(),
3064 "Please use -XX:MarkStackSizeMax in place of "
3065 "-XX:CMSMarkStackSizeMax in the future\n");
3066 if (FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size) != Flag::SUCCESS) {
3067 return JNI_EINVAL;
3068 }
3069 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3070 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3071 uintx conc_threads = 0;
3072 if (!parse_uintx(tail, &conc_threads, 1)) {
3073 jio_fprintf(defaultStream::error_stream(),
3074 "Invalid concurrent threads: %s\n", option->optionString);
3075 return JNI_EINVAL;
3076 }
3077 jio_fprintf(defaultStream::error_stream(),
3078 "Please use -XX:ConcGCThreads in place of "
3079 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n");
3080 if (FLAG_SET_CMDLINE(uint, ConcGCThreads, conc_threads) != Flag::SUCCESS) {
3081 return JNI_EINVAL;
3082 }
3083 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3084 julong max_direct_memory_size = 0;
3085 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3086 if (errcode != arg_in_range) {
3087 jio_fprintf(defaultStream::error_stream(),
3088 "Invalid maximum direct memory size: %s\n",
3089 option->optionString);
3090 describe_range_error(errcode);
3091 return JNI_EINVAL;
3092 }
3093 if (FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size) != Flag::SUCCESS) {
3094 return JNI_EINVAL;
3095 }
3096 #if !INCLUDE_MANAGEMENT
3097 } else if (match_option(option, "-XX:+ManagementServer")) {
3098 jio_fprintf(defaultStream::error_stream(),
3099 "ManagementServer is not supported in this VM.\n");
3100 return JNI_ERR;
3101 #endif // INCLUDE_MANAGEMENT
3102 // CreateMinidumpOnCrash is removed, and replaced by CreateCoredumpOnCrash
3103 } else if (match_option(option, "-XX:+CreateMinidumpOnCrash")) {
3104 if (FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, true) != Flag::SUCCESS) {
3105 return JNI_EINVAL;
3106 }
3107 jio_fprintf(defaultStream::output_stream(),
3108 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is on\n");
3109 } else if (match_option(option, "-XX:-CreateMinidumpOnCrash")) {
3110 if (FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, false) != Flag::SUCCESS) {
3111 return JNI_EINVAL;
3112 }
3113 jio_fprintf(defaultStream::output_stream(),
3114 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is off\n");
3115 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3116 // Skip -XX:Flags= since that case has already been handled
3117 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3118 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3119 return JNI_EINVAL;
3120 }
3121 }
3122 // Unknown option
3123 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3124 return JNI_ERR;
3125 }
3126 }
3127
3128 // PrintSharedArchiveAndExit will turn on
3129 // -Xshare:on
3130 // -XX:+TraceClassPaths
3131 if (PrintSharedArchiveAndExit) {
3132 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3133 return JNI_EINVAL;
3134 }
3135 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3136 return JNI_EINVAL;
3137 }
3138 if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) {
3139 return JNI_EINVAL;
3140 }
3141 }
3142
3143 // Change the default value for flags which have different default values
3144 // when working with older JDKs.
3145 #ifdef LINUX
3146 if (JDK_Version::current().compare_major(6) <= 0 &&
3147 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3148 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3149 }
3150 #endif // LINUX
3151 fix_appclasspath();
3152 return JNI_OK;
3153 }
3154
3155 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3156 //
3157 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3158 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3159 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3160 // path is treated as the current directory.
3161 //
3162 // This causes problems with CDS, which requires that all directories specified in the classpath
3163 // must be empty. In most cases, applications do NOT want to load classes from the current
3164 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3165 // scripts compatible with CDS.
3166 void Arguments::fix_appclasspath() {
3167 if (IgnoreEmptyClassPaths) {
3168 const char separator = *os::path_separator();
3169 const char* src = _java_class_path->value();
3170
3171 // skip over all the leading empty paths
3172 while (*src == separator) {
3173 src ++;
3174 }
3175
3176 char* copy = os::strdup_check_oom(src, mtInternal);
3177
3178 // trim all trailing empty paths
3179 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3180 *tail = '\0';
3181 }
3182
3183 char from[3] = {separator, separator, '\0'};
3184 char to [2] = {separator, '\0'};
3185 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3186 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3187 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3188 }
3189
3190 _java_class_path->set_value(copy);
3191 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3192 }
3193
3194 if (!PrintSharedArchiveAndExit) {
3195 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3196 }
3197 }
3198
3199 static bool has_jar_files(const char* directory) {
3200 DIR* dir = os::opendir(directory);
3201 if (dir == NULL) return false;
3202
3203 struct dirent *entry;
3204 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3205 bool hasJarFile = false;
3206 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3207 const char* name = entry->d_name;
3208 const char* ext = name + strlen(name) - 4;
3209 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3210 }
3211 FREE_C_HEAP_ARRAY(char, dbuf);
3212 os::closedir(dir);
3213 return hasJarFile ;
3214 }
3215
3216 static int check_non_empty_dirs(const char* path) {
3217 const char separator = *os::path_separator();
3218 const char* const end = path + strlen(path);
3219 int nonEmptyDirs = 0;
3220 while (path < end) {
3221 const char* tmp_end = strchr(path, separator);
3222 if (tmp_end == NULL) {
3223 if (has_jar_files(path)) {
3224 nonEmptyDirs++;
3225 jio_fprintf(defaultStream::output_stream(),
3226 "Non-empty directory: %s\n", path);
3227 }
3228 path = end;
3229 } else {
3230 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3231 memcpy(dirpath, path, tmp_end - path);
3232 dirpath[tmp_end - path] = '\0';
3233 if (has_jar_files(dirpath)) {
3234 nonEmptyDirs++;
3235 jio_fprintf(defaultStream::output_stream(),
3236 "Non-empty directory: %s\n", dirpath);
3237 }
3238 FREE_C_HEAP_ARRAY(char, dirpath);
3239 path = tmp_end + 1;
3240 }
3241 }
3242 return nonEmptyDirs;
3243 }
3244
3245 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3246 // check if the default lib/endorsed directory exists; if so, error
3247 char path[JVM_MAXPATHLEN];
3248 const char* fileSep = os::file_separator();
3249 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3250
3251 if (CheckEndorsedAndExtDirs) {
3252 int nonEmptyDirs = 0;
3253 // check endorsed directory
3254 nonEmptyDirs += check_non_empty_dirs(path);
3255 // check the extension directories
3256 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3257 if (nonEmptyDirs > 0) {
3258 return JNI_ERR;
3259 }
3260 }
3261
3262 DIR* dir = os::opendir(path);
3263 if (dir != NULL) {
3264 jio_fprintf(defaultStream::output_stream(),
3265 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3266 "in modular form will be supported via the concept of upgradeable modules.\n");
3267 os::closedir(dir);
3268 return JNI_ERR;
3269 }
3270
3271 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3272 dir = os::opendir(path);
3273 if (dir != NULL) {
3274 jio_fprintf(defaultStream::output_stream(),
3275 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3276 "Use -classpath instead.\n.");
3277 os::closedir(dir);
3278 return JNI_ERR;
3279 }
3280
3281 if (scp_assembly_required) {
3282 // Assemble the bootclasspath elements into the final path.
3283 Arguments::set_sysclasspath(scp_p->combined_path());
3284 }
3285
3286 // This must be done after all arguments have been processed.
3287 // java_compiler() true means set to "NONE" or empty.
3288 if (java_compiler() && !xdebug_mode()) {
3289 // For backwards compatibility, we switch to interpreted mode if
3290 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3291 // not specified.
3292 set_mode_flags(_int);
3293 }
3294
3295 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3296 // but like -Xint, leave compilation thresholds unaffected.
3297 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3298 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3299 set_mode_flags(_int);
3300 }
3301
3302 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3303 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3304 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3305 }
3306
3307 #ifndef COMPILER2
3308 // Don't degrade server performance for footprint
3309 if (FLAG_IS_DEFAULT(UseLargePages) &&
3310 MaxHeapSize < LargePageHeapSizeThreshold) {
3311 // No need for large granularity pages w/small heaps.
3312 // Note that large pages are enabled/disabled for both the
3313 // Java heap and the code cache.
3314 FLAG_SET_DEFAULT(UseLargePages, false);
3315 }
3316
3317 #else
3318 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3319 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3320 }
3321 #endif
3322
3323 #ifndef TIERED
3324 // Tiered compilation is undefined.
3325 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3326 #endif
3327
3328 // If we are running in a headless jre, force java.awt.headless property
3329 // to be true unless the property has already been set.
3330 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3331 if (os::is_headless_jre()) {
3332 const char* headless = Arguments::get_property("java.awt.headless");
3333 if (headless == NULL) {
3334 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3335 if (headless_env == NULL) {
3336 if (!add_property("java.awt.headless=true")) {
3337 return JNI_ENOMEM;
3338 }
3339 } else {
3340 char buffer[256];
3341 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3342 if (!add_property(buffer)) {
3343 return JNI_ENOMEM;
3344 }
3345 }
3346 }
3347 }
3348
3349 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3350 // CMS can only be used with ParNew
3351 FLAG_SET_ERGO(bool, UseParNewGC, true);
3352 }
3353
3354 if (!check_vm_args_consistency()) {
3355 return JNI_ERR;
3356 }
3357
3358 return JNI_OK;
3359 }
3360
3361 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3362 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3363 scp_assembly_required_p);
3364 }
3365
3366 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3367 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3368 scp_assembly_required_p);
3369 }
3370
3371 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3372 char *buffer = ::getenv(name);
3373
3374 // Don't check this variable if user has special privileges
3375 // (e.g. unix su command).
3376 if (buffer == NULL || os::have_special_privileges()) {
3377 return JNI_OK;
3378 }
3379
3380 if ((buffer = os::strdup(buffer)) == NULL) {
3381 return JNI_ENOMEM;
3382 }
3383
3384 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3385 jio_fprintf(defaultStream::error_stream(),
3386 "Picked up %s: %s\n", name, buffer);
3387 char* rd = buffer; // pointer to the input string (rd)
3388 while (true) { // repeat for all options in the input string
3389 while (isspace(*rd)) rd++; // skip whitespace
3390 if (*rd == 0) break; // we re done when the input string is read completely
3391
3392 // The output, option string, overwrites the input string.
3393 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3394 // input string (rd).
3395 char* wrt = rd;
3396
3397 JavaVMOption option;
3398 option.optionString = wrt;
3399 options->append(option); // Fill in option
3400 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3401 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3402 int quote = *rd; // matching quote to look for
3403 rd++; // don't copy open quote
3404 while (*rd != quote) { // include everything (even spaces) up until quote
3405 if (*rd == 0) { // string termination means unmatched string
3406 jio_fprintf(defaultStream::error_stream(),
3407 "Unmatched quote in %s\n", name);
3408 delete options;
3409 os::free(buffer);
3410 return JNI_ERR;
3411 }
3412 *wrt++ = *rd++; // copy to option string
3413 }
3414 rd++; // don't copy close quote
3415 } else {
3416 *wrt++ = *rd++; // copy to option string
3417 }
3418 }
3419 // Need to check if we're done before writing a NULL,
3420 // because the write could be to the byte that rd is pointing to.
3421 if (*rd++ == 0) {
3422 *wrt = 0;
3423 break;
3424 }
3425 *wrt = 0; // Zero terminate option
3426 }
3427 JavaVMOption* options_arr =
3428 NEW_C_HEAP_ARRAY_RETURN_NULL(JavaVMOption, options->length(), mtInternal);
3429 if (options_arr == NULL) {
3430 delete options;
3431 os::free(buffer);
3432 return JNI_ENOMEM;
3433 }
3434 for (int i = 0; i < options->length(); i++) {
3435 options_arr[i] = options->at(i);
3436 }
3437
3438 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3439 JavaVMInitArgs vm_args;
3440 vm_args.version = JNI_VERSION_1_2;
3441 vm_args.options = options_arr;
3442 vm_args.nOptions = options->length();
3443 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3444
3445 if (PrintVMOptions) {
3446 const char* tail;
3447 for (int i = 0; i < vm_args.nOptions; i++) {
3448 const JavaVMOption *option = vm_args.options + i;
3449 if (match_option(option, "-XX:", &tail)) {
3450 logOption(tail);
3451 }
3452 }
3453 }
3454
3455 jint result = parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p,
3456 Flag::ENVIRON_VAR);
3457 FREE_C_HEAP_ARRAY(JavaVMOption, options_arr);
3458 delete options;
3459 os::free(buffer);
3460 return result;
3461 }
3462
3463 void Arguments::set_shared_spaces_flags() {
3464 if (DumpSharedSpaces) {
3465 if (RequireSharedSpaces) {
3466 warning("cannot dump shared archive while using shared archive");
3467 }
3468 UseSharedSpaces = false;
3469 #ifdef _LP64
3470 if (!UseCompressedOops || !UseCompressedClassPointers) {
3471 vm_exit_during_initialization(
3472 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3473 }
3474 } else {
3475 if (!UseCompressedOops || !UseCompressedClassPointers) {
3476 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3477 }
3478 #endif
3479 }
3480 }
3481
3482 #if !INCLUDE_ALL_GCS
3483 static void force_serial_gc() {
3484 FLAG_SET_DEFAULT(UseSerialGC, true);
3485 UNSUPPORTED_GC_OPTION(UseG1GC);
3486 UNSUPPORTED_GC_OPTION(UseParallelGC);
3487 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3488 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3489 UNSUPPORTED_GC_OPTION(UseParNewGC);
3490 }
3491 #endif // INCLUDE_ALL_GCS
3492
3493 // Sharing support
3494 // Construct the path to the archive
3495 static char* get_shared_archive_path() {
3496 char *shared_archive_path;
3497 if (SharedArchiveFile == NULL) {
3498 char jvm_path[JVM_MAXPATHLEN];
3499 os::jvm_path(jvm_path, sizeof(jvm_path));
3500 char *end = strrchr(jvm_path, *os::file_separator());
3501 if (end != NULL) *end = '\0';
3502 size_t jvm_path_len = strlen(jvm_path);
3503 size_t file_sep_len = strlen(os::file_separator());
3504 const size_t len = jvm_path_len + file_sep_len + 20;
3505 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3506 if (shared_archive_path != NULL) {
3507 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3508 jvm_path, os::file_separator());
3509 }
3510 } else {
3511 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3512 }
3513 return shared_archive_path;
3514 }
3515
3516 #ifndef PRODUCT
3517 // Determine whether LogVMOutput should be implicitly turned on.
3518 static bool use_vm_log() {
3519 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3520 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3521 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3522 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3523 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3524 return true;
3525 }
3526
3527 #ifdef COMPILER1
3528 if (PrintC1Statistics) {
3529 return true;
3530 }
3531 #endif // COMPILER1
3532
3533 #ifdef COMPILER2
3534 if (PrintOptoAssembly || PrintOptoStatistics) {
3535 return true;
3536 }
3537 #endif // COMPILER2
3538
3539 return false;
3540 }
3541 #endif // PRODUCT
3542
3543 // Parse entry point called from JNI_CreateJavaVM
3544
3545 jint Arguments::parse(const JavaVMInitArgs* args) {
3546
3547 // Initialize ranges and constraints
3548 CommandLineFlagRangeList::init();
3549 CommandLineFlagConstraintList::init();
3550
3551 // Remaining part of option string
3552 const char* tail;
3553
3554 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3555 const char* hotspotrc = ".hotspotrc";
3556 bool settings_file_specified = false;
3557 bool needs_hotspotrc_warning = false;
3558
3559 const char* flags_file;
3560 int index;
3561 for (index = 0; index < args->nOptions; index++) {
3562 const JavaVMOption *option = args->options + index;
3563 if (ArgumentsExt::process_options(option)) {
3564 continue;
3565 }
3566 if (match_option(option, "-XX:Flags=", &tail)) {
3567 flags_file = tail;
3568 settings_file_specified = true;
3569 continue;
3570 }
3571 if (match_option(option, "-XX:+PrintVMOptions")) {
3572 PrintVMOptions = true;
3573 continue;
3574 }
3575 if (match_option(option, "-XX:-PrintVMOptions")) {
3576 PrintVMOptions = false;
3577 continue;
3578 }
3579 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3580 IgnoreUnrecognizedVMOptions = true;
3581 continue;
3582 }
3583 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3584 IgnoreUnrecognizedVMOptions = false;
3585 continue;
3586 }
3587 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3588 CommandLineFlags::printFlags(tty, false);
3589 vm_exit(0);
3590 }
3591 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3592 #if INCLUDE_NMT
3593 // The launcher did not setup nmt environment variable properly.
3594 if (!MemTracker::check_launcher_nmt_support(tail)) {
3595 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3596 }
3597
3598 // Verify if nmt option is valid.
3599 if (MemTracker::verify_nmt_option()) {
3600 // Late initialization, still in single-threaded mode.
3601 if (MemTracker::tracking_level() >= NMT_summary) {
3602 MemTracker::init();
3603 }
3604 } else {
3605 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3606 }
3607 continue;
3608 #else
3609 jio_fprintf(defaultStream::error_stream(),
3610 "Native Memory Tracking is not supported in this VM\n");
3611 return JNI_ERR;
3612 #endif
3613 }
3614
3615 #ifndef PRODUCT
3616 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3617 CommandLineFlags::printFlags(tty, true);
3618 vm_exit(0);
3619 }
3620 #endif
3621 }
3622
3623 if (IgnoreUnrecognizedVMOptions) {
3624 // uncast const to modify the flag args->ignoreUnrecognized
3625 *(jboolean*)(&args->ignoreUnrecognized) = true;
3626 }
3627
3628 // Parse specified settings file
3629 if (settings_file_specified) {
3630 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3631 return JNI_EINVAL;
3632 }
3633 } else {
3634 #ifdef ASSERT
3635 // Parse default .hotspotrc settings file
3636 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3637 return JNI_EINVAL;
3638 }
3639 #else
3640 struct stat buf;
3641 if (os::stat(hotspotrc, &buf) == 0) {
3642 needs_hotspotrc_warning = true;
3643 }
3644 #endif
3645 }
3646
3647 if (PrintVMOptions) {
3648 for (index = 0; index < args->nOptions; index++) {
3649 const JavaVMOption *option = args->options + index;
3650 if (match_option(option, "-XX:", &tail)) {
3651 logOption(tail);
3652 }
3653 }
3654 }
3655
3656 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3657 jint result = parse_vm_init_args(args);
3658 if (result != JNI_OK) {
3659 return result;
3660 }
3661
3662 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3663 SharedArchivePath = get_shared_archive_path();
3664 if (SharedArchivePath == NULL) {
3665 return JNI_ENOMEM;
3666 }
3667
3668 // Set up VerifySharedSpaces
3669 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3670 VerifySharedSpaces = true;
3671 }
3672
3673 // Delay warning until here so that we've had a chance to process
3674 // the -XX:-PrintWarnings flag
3675 if (needs_hotspotrc_warning) {
3676 warning("%s file is present but has been ignored. "
3677 "Run with -XX:Flags=%s to load the file.",
3678 hotspotrc, hotspotrc);
3679 }
3680
3681 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3682 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3683 #endif
3684
3685 ArgumentsExt::report_unsupported_options();
3686
3687 #ifndef PRODUCT
3688 if (TraceBytecodesAt != 0) {
3689 TraceBytecodes = true;
3690 }
3691 if (CountCompiledCalls) {
3692 if (UseCounterDecay) {
3693 warning("UseCounterDecay disabled because CountCalls is set");
3694 UseCounterDecay = false;
3695 }
3696 }
3697 #endif // PRODUCT
3698
3699 if (ScavengeRootsInCode == 0) {
3700 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3701 warning("forcing ScavengeRootsInCode non-zero");
3702 }
3703 ScavengeRootsInCode = 1;
3704 }
3705
3706 if (PrintGCDetails) {
3707 // Turn on -verbose:gc options as well
3708 PrintGC = true;
3709 }
3710
3711 // Set object alignment values.
3712 set_object_alignment();
3713
3714 #if !INCLUDE_ALL_GCS
3715 force_serial_gc();
3716 #endif // INCLUDE_ALL_GCS
3717 #if !INCLUDE_CDS
3718 if (DumpSharedSpaces || RequireSharedSpaces) {
3719 jio_fprintf(defaultStream::error_stream(),
3720 "Shared spaces are not supported in this VM\n");
3721 return JNI_ERR;
3722 }
3723 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3724 warning("Shared spaces are not supported in this VM");
3725 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3726 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3727 }
3728 no_shared_spaces("CDS Disabled");
3729 #endif // INCLUDE_CDS
3730
3731 return JNI_OK;
3732 }
3733
3734 jint Arguments::apply_ergo() {
3735
3736 // Set flags based on ergonomics.
3737 set_ergonomics_flags();
3738
3739 set_shared_spaces_flags();
3740
3741 // Check the GC selections again.
3742 if (!check_gc_consistency()) {
3743 return JNI_EINVAL;
3744 }
3745
3746 if (TieredCompilation) {
3747 set_tiered_flags();
3748 } else {
3749 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3750 if (CompilationPolicyChoice >= 2) {
3751 vm_exit_during_initialization(
3752 "Incompatible compilation policy selected", NULL);
3753 }
3754 // Scale CompileThreshold
3755 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
3756 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
3757 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
3758 }
3759 }
3760
3761 #ifdef COMPILER2
3762 #ifndef PRODUCT
3763 if (PrintIdealGraphLevel > 0) {
3764 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3765 }
3766 #endif
3767 #endif
3768
3769 // Set heap size based on available physical memory
3770 set_heap_size();
3771
3772 ArgumentsExt::set_gc_specific_flags();
3773
3774 // Initialize Metaspace flags and alignments
3775 Metaspace::ergo_initialize();
3776
3777 // Set bytecode rewriting flags
3778 set_bytecode_flags();
3779
3780 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3781 set_aggressive_opts_flags();
3782
3783 // Turn off biased locking for locking debug mode flags,
3784 // which are subtly different from each other but neither works with
3785 // biased locking
3786 if (UseHeavyMonitors
3787 #ifdef COMPILER1
3788 || !UseFastLocking
3789 #endif // COMPILER1
3790 ) {
3791 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3792 // flag set to true on command line; warn the user that they
3793 // can't enable biased locking here
3794 warning("Biased Locking is not supported with locking debug flags"
3795 "; ignoring UseBiasedLocking flag." );
3796 }
3797 UseBiasedLocking = false;
3798 }
3799
3800 #ifdef ZERO
3801 // Clear flags not supported on zero.
3802 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3803 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3804 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3805 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3806 #endif // CC_INTERP
3807
3808 #ifdef COMPILER2
3809 if (!EliminateLocks) {
3810 EliminateNestedLocks = false;
3811 }
3812 if (!Inline) {
3813 IncrementalInline = false;
3814 }
3815 #ifndef PRODUCT
3816 if (!IncrementalInline) {
3817 AlwaysIncrementalInline = false;
3818 }
3819 #endif
3820 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3821 // nothing to use the profiling, turn if off
3822 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3823 }
3824 #endif
3825
3826 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3827 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3828 DebugNonSafepoints = true;
3829 }
3830
3831 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
3832 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
3833 }
3834
3835 #ifndef PRODUCT
3836 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
3837 if (use_vm_log()) {
3838 LogVMOutput = true;
3839 }
3840 }
3841 #endif // PRODUCT
3842
3843 if (PrintCommandLineFlags) {
3844 CommandLineFlags::printSetFlags(tty);
3845 }
3846
3847 // Apply CPU specific policy for the BiasedLocking
3848 if (UseBiasedLocking) {
3849 if (!VM_Version::use_biased_locking() &&
3850 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3851 UseBiasedLocking = false;
3852 }
3853 }
3854 #ifdef COMPILER2
3855 if (!UseBiasedLocking || EmitSync != 0) {
3856 UseOptoBiasInlining = false;
3857 }
3858 #endif
3859
3860 return JNI_OK;
3861 }
3862
3863 jint Arguments::adjust_after_os() {
3864 if (UseNUMA) {
3865 if (UseParallelGC || UseParallelOldGC) {
3866 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3867 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3868 }
3869 }
3870 // UseNUMAInterleaving is set to ON for all collectors and
3871 // platforms when UseNUMA is set to ON. NUMA-aware collectors
3872 // such as the parallel collector for Linux and Solaris will
3873 // interleave old gen and survivor spaces on top of NUMA
3874 // allocation policy for the eden space.
3875 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
3876 // all platforms and ParallelGC on Windows will interleave all
3877 // of the heap spaces across NUMA nodes.
3878 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
3879 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
3880 }
3881 }
3882 return JNI_OK;
3883 }
3884
3885 // Any custom code post the final range and constraint check
3886 // can be done here. We pass a flag that specifies whether
3887 // the check passed successfully
3888 void Arguments::post_final_range_and_constraint_check(bool check_passed) {
3889 // This does not set the flag itself, but stores the value in a safe place for later usage.
3890 _min_heap_free_ratio = MinHeapFreeRatio;
3891 _max_heap_free_ratio = MaxHeapFreeRatio;
3892 }
3893
3894 int Arguments::PropertyList_count(SystemProperty* pl) {
3895 int count = 0;
3896 while(pl != NULL) {
3897 count++;
3898 pl = pl->next();
3899 }
3900 return count;
3901 }
3902
3903 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3904 assert(key != NULL, "just checking");
3905 SystemProperty* prop;
3906 for (prop = pl; prop != NULL; prop = prop->next()) {
3907 if (strcmp(key, prop->key()) == 0) return prop->value();
3908 }
3909 return NULL;
3910 }
3911
3912 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3913 int count = 0;
3914 const char* ret_val = NULL;
3915
3916 while(pl != NULL) {
3917 if(count >= index) {
3918 ret_val = pl->key();
3919 break;
3920 }
3921 count++;
3922 pl = pl->next();
3923 }
3924
3925 return ret_val;
3926 }
3927
3928 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3929 int count = 0;
3930 char* ret_val = NULL;
3931
3932 while(pl != NULL) {
3933 if(count >= index) {
3934 ret_val = pl->value();
3935 break;
3936 }
3937 count++;
3938 pl = pl->next();
3939 }
3940
3941 return ret_val;
3942 }
3943
3944 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3945 SystemProperty* p = *plist;
3946 if (p == NULL) {
3947 *plist = new_p;
3948 } else {
3949 while (p->next() != NULL) {
3950 p = p->next();
3951 }
3952 p->set_next(new_p);
3953 }
3954 }
3955
3956 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3957 if (plist == NULL)
3958 return;
3959
3960 SystemProperty* new_p = new SystemProperty(k, v, true);
3961 PropertyList_add(plist, new_p);
3962 }
3963
3964 void Arguments::PropertyList_add(SystemProperty *element) {
3965 PropertyList_add(&_system_properties, element);
3966 }
3967
3968 // This add maintains unique property key in the list.
3969 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3970 if (plist == NULL)
3971 return;
3972
3973 // If property key exist then update with new value.
3974 SystemProperty* prop;
3975 for (prop = *plist; prop != NULL; prop = prop->next()) {
3976 if (strcmp(k, prop->key()) == 0) {
3977 if (append) {
3978 prop->append_value(v);
3979 } else {
3980 prop->set_value(v);
3981 }
3982 return;
3983 }
3984 }
3985
3986 PropertyList_add(plist, k, v);
3987 }
3988
3989 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3990 // Returns true if all of the source pointed by src has been copied over to
3991 // the destination buffer pointed by buf. Otherwise, returns false.
3992 // Notes:
3993 // 1. If the length (buflen) of the destination buffer excluding the
3994 // NULL terminator character is not long enough for holding the expanded
3995 // pid characters, it also returns false instead of returning the partially
3996 // expanded one.
3997 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3998 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3999 char* buf, size_t buflen) {
4000 const char* p = src;
4001 char* b = buf;
4002 const char* src_end = &src[srclen];
4003 char* buf_end = &buf[buflen - 1];
4004
4005 while (p < src_end && b < buf_end) {
4006 if (*p == '%') {
4007 switch (*(++p)) {
4008 case '%': // "%%" ==> "%"
4009 *b++ = *p++;
4010 break;
4011 case 'p': { // "%p" ==> current process id
4012 // buf_end points to the character before the last character so
4013 // that we could write '\0' to the end of the buffer.
4014 size_t buf_sz = buf_end - b + 1;
4015 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4016
4017 // if jio_snprintf fails or the buffer is not long enough to hold
4018 // the expanded pid, returns false.
4019 if (ret < 0 || ret >= (int)buf_sz) {
4020 return false;
4021 } else {
4022 b += ret;
4023 assert(*b == '\0', "fail in copy_expand_pid");
4024 if (p == src_end && b == buf_end + 1) {
4025 // reach the end of the buffer.
4026 return true;
4027 }
4028 }
4029 p++;
4030 break;
4031 }
4032 default :
4033 *b++ = '%';
4034 }
4035 } else {
4036 *b++ = *p++;
4037 }
4038 }
4039 *b = '\0';
4040 return (p == src_end); // return false if not all of the source was copied
4041 }