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280 // Returns true if the flag is obsolete and fits into the range specified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