1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaAssertions.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "code/codeCacheExtensions.hpp"
31 #include "compiler/compilerOracle.hpp"
32 #include "gc/shared/cardTableRS.hpp"
33 #include "gc/shared/genCollectedHeap.hpp"
34 #include "gc/shared/referenceProcessor.hpp"
35 #include "gc/shared/taskqueue.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/universe.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "prims/jvmtiExport.hpp"
40 #include "runtime/arguments.hpp"
41 #include "runtime/arguments_ext.hpp"
42 #include "runtime/commandLineFlagConstraintList.hpp"
43 #include "runtime/commandLineFlagRangeList.hpp"
44 #include "runtime/globals.hpp"
45 #include "runtime/globals_extension.hpp"
46 #include "runtime/java.hpp"
47 #include "runtime/os.hpp"
48 #include "runtime/vm_version.hpp"
49 #include "services/management.hpp"
50 #include "services/memTracker.hpp"
51 #include "utilities/defaultStream.hpp"
52 #include "utilities/macros.hpp"
53 #include "utilities/stringUtils.hpp"
54 #if INCLUDE_ALL_GCS
55 #include "gc/cms/compactibleFreeListSpace.hpp"
56 #include "gc/g1/g1CollectedHeap.inline.hpp"
57 #include "gc/parallel/parallelScavengeHeap.hpp"
58 #endif // INCLUDE_ALL_GCS
59
60 // Note: This is a special bug reporting site for the JVM
61 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp"
62 #define DEFAULT_JAVA_LAUNCHER "generic"
63
64 #define UNSUPPORTED_GC_OPTION(gc) \
65 do { \
66 if (gc) { \
67 if (FLAG_IS_CMDLINE(gc)) { \
68 warning(#gc " is not supported in this VM. Using Serial GC."); \
69 } \
70 FLAG_SET_DEFAULT(gc, false); \
71 } \
72 } while(0)
73
74 char** Arguments::_jvm_flags_array = NULL;
75 int Arguments::_num_jvm_flags = 0;
76 char** Arguments::_jvm_args_array = NULL;
77 int Arguments::_num_jvm_args = 0;
78 char* Arguments::_java_command = NULL;
79 SystemProperty* Arguments::_system_properties = NULL;
80 const char* Arguments::_gc_log_filename = NULL;
81 bool Arguments::_has_profile = false;
82 size_t Arguments::_conservative_max_heap_alignment = 0;
83 size_t Arguments::_min_heap_size = 0;
84 uintx Arguments::_min_heap_free_ratio = 0;
85 uintx Arguments::_max_heap_free_ratio = 0;
86 Arguments::Mode Arguments::_mode = _mixed;
87 bool Arguments::_java_compiler = false;
88 bool Arguments::_xdebug_mode = false;
89 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
90 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
91 int Arguments::_sun_java_launcher_pid = -1;
92 bool Arguments::_sun_java_launcher_is_altjvm = false;
93
94 // These parameters are reset in method parse_vm_init_args()
95 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
96 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
97 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
98 bool Arguments::_ClipInlining = ClipInlining;
99 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
100 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
101
102 char* Arguments::SharedArchivePath = NULL;
103
104 AgentLibraryList Arguments::_libraryList;
105 AgentLibraryList Arguments::_agentList;
106
107 abort_hook_t Arguments::_abort_hook = NULL;
108 exit_hook_t Arguments::_exit_hook = NULL;
109 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
110
111
112 SystemProperty *Arguments::_sun_boot_library_path = NULL;
113 SystemProperty *Arguments::_java_library_path = NULL;
114 SystemProperty *Arguments::_java_home = NULL;
115 SystemProperty *Arguments::_java_class_path = NULL;
116 SystemProperty *Arguments::_sun_boot_class_path = NULL;
117
118 char* Arguments::_ext_dirs = NULL;
119
120 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining
121 // part of the option string.
122 static bool match_option(const JavaVMOption *option, const char* name,
123 const char** tail) {
124 size_t len = strlen(name);
125 if (strncmp(option->optionString, name, len) == 0) {
126 *tail = option->optionString + len;
127 return true;
128 } else {
129 return false;
130 }
131 }
132
133 // Check if 'option' matches 'name'. No "tail" is allowed.
134 static bool match_option(const JavaVMOption *option, const char* name) {
135 const char* tail = NULL;
136 bool result = match_option(option, name, &tail);
137 if (tail != NULL && *tail == '\0') {
138 return result;
139 } else {
140 return false;
141 }
142 }
143
144 // Return true if any of the strings in null-terminated array 'names' matches.
145 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
146 // the option must match exactly.
147 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
148 bool tail_allowed) {
149 for (/* empty */; *names != NULL; ++names) {
150 if (match_option(option, *names, tail)) {
151 if (**tail == '\0' || tail_allowed && **tail == ':') {
152 return true;
153 }
154 }
155 }
156 return false;
157 }
158
159 static void logOption(const char* opt) {
160 if (PrintVMOptions) {
161 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
162 }
163 }
164
165 // Process java launcher properties.
166 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
167 // See if sun.java.launcher, sun.java.launcher.is_altjvm or
168 // sun.java.launcher.pid is defined.
169 // Must do this before setting up other system properties,
170 // as some of them may depend on launcher type.
171 for (int index = 0; index < args->nOptions; index++) {
172 const JavaVMOption* option = args->options + index;
173 const char* tail;
174
175 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
176 process_java_launcher_argument(tail, option->extraInfo);
177 continue;
178 }
179 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) {
180 if (strcmp(tail, "true") == 0) {
181 _sun_java_launcher_is_altjvm = true;
182 }
183 continue;
184 }
185 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
186 _sun_java_launcher_pid = atoi(tail);
187 continue;
188 }
189 }
190 }
191
192 // Initialize system properties key and value.
193 void Arguments::init_system_properties() {
194 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
195 "Java Virtual Machine Specification", false));
196 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
197 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
198 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
199
200 // Following are JVMTI agent writable properties.
201 // Properties values are set to NULL and they are
202 // os specific they are initialized in os::init_system_properties_values().
203 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
204 _java_library_path = new SystemProperty("java.library.path", NULL, true);
205 _java_home = new SystemProperty("java.home", NULL, true);
206 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
207
208 _java_class_path = new SystemProperty("java.class.path", "", true);
209
210 // Add to System Property list.
211 PropertyList_add(&_system_properties, _sun_boot_library_path);
212 PropertyList_add(&_system_properties, _java_library_path);
213 PropertyList_add(&_system_properties, _java_home);
214 PropertyList_add(&_system_properties, _java_class_path);
215 PropertyList_add(&_system_properties, _sun_boot_class_path);
216
217 // Set OS specific system properties values
218 os::init_system_properties_values();
219 }
220
221 // Update/Initialize System properties after JDK version number is known
222 void Arguments::init_version_specific_system_properties() {
223 enum { bufsz = 16 };
224 char buffer[bufsz];
225 const char* spec_vendor = "Oracle Corporation";
226 uint32_t spec_version = JDK_Version::current().major_version();
227
228 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
229
230 PropertyList_add(&_system_properties,
231 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
232 PropertyList_add(&_system_properties,
233 new SystemProperty("java.vm.specification.version", buffer, false));
234 PropertyList_add(&_system_properties,
235 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
236 }
237
238 /*
239 * -XX argument processing:
240 *
241 * -XX arguments are defined in several places, such as:
242 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp.
243 * -XX arguments are parsed in parse_argument().
244 * -XX argument bounds checking is done in check_vm_args_consistency().
245 *
246 * Over time -XX arguments may change. There are mechanisms to handle common cases:
247 *
248 * ALIAS: An option may be renamed or replaced by another option. The old name can be supported by
249 * adding the old and new option names to the "aliased_jvm_flags" table. Delete the old
250 * variable from globals.hpp. This is often part of the process of deprecating a flag, but
251 * not all aliases need to be deprecated.
252 *
253 * DEPRECATED: An option may be supported, but a warning is printed to let the user know that support may
254 * be removed in the future. Both regular and aliased options may be deprecated.
255 * Add a deprecation warning for an option (or alias) by adding an entry in the
256 * "deprecated_jvm_flags" table. Specify the option name, the jdk version that deprecated the
257 * option, and the jdk version that will expire the option (use "undefined()" if removal has
258 * been not scheduled).
259 *
260 * OBSOLETE: An option may be removed (and deleted from globals.hpp), but still be accepted on the command
261 * line. A warning is printed to let the user know that support may be removed in the future.
262 * Add an obsolete warning for an option (or alias) by adding an entry in the
263 * "obsolete_jvm_flags" table. Specify the option name, the jdk version that obsoleted the option,
264 * and the jdk version that will expire the option (use "undefined()" if removal has been not
265 * scheduled).
266 *
267 * EXPIRED: When the current JDK version is equal or greater to the "accept_until" version of a deprecated
268 * or obsolete option, the system will flatly refuse to admit the existence of the flag. This
269 * allows a flag to die correctly over JDK releases.
270 * Note that manual cleanup of expired options should be done at major JDK version upgrades:
271 * - Expired options can be removed from the obsolete_jvm_flags, deprecated_jvm_flags tables,
272 * and aliased_jvm_flags tables.
273 * - Removed options may have global variable definitions that should also be
274 * removed (in globals.hpp, etc).
275 *
276 * Tests: Aliases are tested in VMAliasOptions.java.
277 * Deprecated options are tested in VMDeprecatedOptions.java.
278 * Obsolete options are tested in various files.
279 */
280
281 // Obsolete or deprecated -XX flag.
282 typedef struct {
283 const char* name;
284 JDK_Version obsoleted_in; // When the warning started (obsolete or deprecated).
285 JDK_Version accept_until; // Which version to start denying the existence of the flag (if scheduled).
286 } SpecialFlag;
287
288 // When a flag is eliminated, it can be added to this list in order to
289 // continue accepting this flag on the command-line, while issuing a warning
290 // and ignoring the value. Once the JDK version reaches the 'accept_until'
291 // limit, we flatly refuse to admit the existence of the flag.
292 static SpecialFlag const obsolete_jvm_flags[] = {
293 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) },
294 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) },
295 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
296 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) },
297 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) },
298 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) },
299 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) },
300 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) },
301 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) },
302 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) },
303 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) },
304 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
305 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) },
306 #ifndef ZERO
307 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
308 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) },
309 #endif // ZERO
310 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) },
311 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) },
312 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) },
313 { "ThreadSafetyMargin", JDK_Version::jdk(9), JDK_Version::jdk(10) },
314 { "LazyBootClassLoader", JDK_Version::jdk(9), JDK_Version::jdk(10) },
315 { "StarvationMonitorInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) },
316 { "PreInflateSpin", JDK_Version::jdk(9), JDK_Version::jdk(10) },
317 { NULL, JDK_Version(0), JDK_Version(0) }
318 };
319
320 // When a flag is deprecated, it can be added to this list in order to issuing a warning when the flag is used.
321 // Once the JDK version reaches the 'accept_until' limit, we flatly refuse to admit the existence of the flag.
322 static SpecialFlag const deprecated_jvm_flags[] = {
323 // deprecated non-alias flags:
324 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined() },
325 { "UseParNewGC", JDK_Version::jdk(9), JDK_Version::jdk(10) },
326
327 // deprecated alias flags (see also aliased_jvm_flags):
328 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined() },
329 { "CMSMarkStackSizeMax", JDK_Version::jdk(9), JDK_Version::jdk(10) },
330 { "CMSMarkStackSize", JDK_Version::jdk(9), JDK_Version::jdk(10) },
331 { "G1MarkStackSize", JDK_Version::jdk(9), JDK_Version::jdk(10) },
332 { "ParallelMarkingThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
333 { "ParallelCMSThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) },
334 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined() },
335 { NULL, JDK_Version(0), JDK_Version(0) }
336 };
337
338 // Flags that are aliases for other flags.
339 typedef struct {
340 const char* alias_name;
341 const char* real_name;
342 } AliasedFlag;
343
344 static AliasedFlag const aliased_jvm_flags[] = {
345 { "DefaultMaxRAMFraction", "MaxRAMFraction" },
346 { "CMSMarkStackSizeMax", "MarkStackSizeMax" },
347 { "CMSMarkStackSize", "MarkStackSize" },
348 { "G1MarkStackSize", "MarkStackSize" },
349 { "ParallelMarkingThreads", "ConcGCThreads" },
350 { "ParallelCMSThreads", "ConcGCThreads" },
351 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" },
352 { NULL, NULL}
353 };
354
355 // Returns 1 if the flag is special and jdk version is in the range specified.
356 // In this case the 'version' buffer is filled in with the version number when
357 // the flag became special.
358 // Returns -1 if the flag is special and has expired (should be ignored).
359 // Returns 0 if the flag is not special.
360 // Flag "flag_name" is a flag name stripped of '+', '-', and '='.
361 static int is_special_flag(const SpecialFlag special_table[], const char *flag_name, JDK_Version* version) {
362 assert(version != NULL, "Must provide a version buffer");
363 for (size_t i = 0; special_table[i].name != NULL; i++) {
364 const SpecialFlag& flag_status = special_table[i];
365 if ((strcmp(flag_status.name, flag_name) == 0)) {
366 if (flag_status.accept_until.is_undefined() ||
367 JDK_Version::current().compare(flag_status.accept_until) == -1) {
368 *version = flag_status.obsoleted_in;
369 return 1;
370 } else {
371 return -1;
372 }
373 }
374 }
375 return 0;
376 }
377
378 bool Arguments::is_newly_obsolete(const char *flag_name, JDK_Version* version) {
379 return (is_special_flag(obsolete_jvm_flags, flag_name, version) == 1);
380 }
381
382 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) {
383 return is_special_flag(deprecated_jvm_flags, flag_name, version);
384 }
385
386 const char* Arguments::real_flag_name(const char *flag_name) {
387 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) {
388 const AliasedFlag& flag_status = aliased_jvm_flags[i];
389 if (strcmp(flag_status.alias_name, flag_name) == 0) {
390 return flag_status.real_name;
391 }
392 }
393 return flag_name;
394 }
395
396 // Constructs the system class path (aka boot class path) from the following
397 // components, in order:
398 //
399 // prefix // from -Xbootclasspath/p:...
400 // base // from os::get_system_properties() or -Xbootclasspath=
401 // suffix // from -Xbootclasspath/a:...
402 //
403 // This could be AllStatic, but it isn't needed after argument processing is
404 // complete.
405 class SysClassPath: public StackObj {
406 public:
407 SysClassPath(const char* base);
408 ~SysClassPath();
409
410 inline void set_base(const char* base);
411 inline void add_prefix(const char* prefix);
412 inline void add_suffix_to_prefix(const char* suffix);
413 inline void add_suffix(const char* suffix);
414 inline void reset_path(const char* base);
415
416 inline const char* get_base() const { return _items[_scp_base]; }
417 inline const char* get_prefix() const { return _items[_scp_prefix]; }
418 inline const char* get_suffix() const { return _items[_scp_suffix]; }
419
420 // Combine all the components into a single c-heap-allocated string; caller
421 // must free the string if/when no longer needed.
422 char* combined_path();
423
424 private:
425 // Utility routines.
426 static char* add_to_path(const char* path, const char* str, bool prepend);
427 static char* add_jars_to_path(char* path, const char* directory);
428
429 inline void reset_item_at(int index);
430
431 // Array indices for the items that make up the sysclasspath. All except the
432 // base are allocated in the C heap and freed by this class.
433 enum {
434 _scp_prefix, // from -Xbootclasspath/p:...
435 _scp_base, // the default sysclasspath
436 _scp_suffix, // from -Xbootclasspath/a:...
437 _scp_nitems // the number of items, must be last.
438 };
439
440 const char* _items[_scp_nitems];
441 };
442
443 SysClassPath::SysClassPath(const char* base) {
444 memset(_items, 0, sizeof(_items));
445 _items[_scp_base] = base;
446 }
447
448 SysClassPath::~SysClassPath() {
449 // Free everything except the base.
450 for (int i = 0; i < _scp_nitems; ++i) {
451 if (i != _scp_base) reset_item_at(i);
452 }
453 }
454
455 inline void SysClassPath::set_base(const char* base) {
456 _items[_scp_base] = base;
457 }
458
459 inline void SysClassPath::add_prefix(const char* prefix) {
460 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
461 }
462
463 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
464 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
465 }
466
467 inline void SysClassPath::add_suffix(const char* suffix) {
468 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
469 }
470
471 inline void SysClassPath::reset_item_at(int index) {
472 assert(index < _scp_nitems && index != _scp_base, "just checking");
473 if (_items[index] != NULL) {
474 FREE_C_HEAP_ARRAY(char, _items[index]);
475 _items[index] = NULL;
476 }
477 }
478
479 inline void SysClassPath::reset_path(const char* base) {
480 // Clear the prefix and suffix.
481 reset_item_at(_scp_prefix);
482 reset_item_at(_scp_suffix);
483 set_base(base);
484 }
485
486 //------------------------------------------------------------------------------
487
488
489 // Combine the bootclasspath elements, some of which may be null, into a single
490 // c-heap-allocated string.
491 char* SysClassPath::combined_path() {
492 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
493
494 size_t lengths[_scp_nitems];
495 size_t total_len = 0;
496
497 const char separator = *os::path_separator();
498
499 // Get the lengths.
500 int i;
501 for (i = 0; i < _scp_nitems; ++i) {
502 if (_items[i] != NULL) {
503 lengths[i] = strlen(_items[i]);
504 // Include space for the separator char (or a NULL for the last item).
505 total_len += lengths[i] + 1;
506 }
507 }
508 assert(total_len > 0, "empty sysclasspath not allowed");
509
510 // Copy the _items to a single string.
511 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
512 char* cp_tmp = cp;
513 for (i = 0; i < _scp_nitems; ++i) {
514 if (_items[i] != NULL) {
515 memcpy(cp_tmp, _items[i], lengths[i]);
516 cp_tmp += lengths[i];
517 *cp_tmp++ = separator;
518 }
519 }
520 *--cp_tmp = '\0'; // Replace the extra separator.
521 return cp;
522 }
523
524 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
525 char*
526 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
527 char *cp;
528
529 assert(str != NULL, "just checking");
530 if (path == NULL) {
531 size_t len = strlen(str) + 1;
532 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
533 memcpy(cp, str, len); // copy the trailing null
534 } else {
535 const char separator = *os::path_separator();
536 size_t old_len = strlen(path);
537 size_t str_len = strlen(str);
538 size_t len = old_len + str_len + 2;
539
540 if (prepend) {
541 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
542 char* cp_tmp = cp;
543 memcpy(cp_tmp, str, str_len);
544 cp_tmp += str_len;
545 *cp_tmp = separator;
546 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
547 FREE_C_HEAP_ARRAY(char, path);
548 } else {
549 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
550 char* cp_tmp = cp + old_len;
551 *cp_tmp = separator;
552 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
553 }
554 }
555 return cp;
556 }
557
558 // Scan the directory and append any jar or zip files found to path.
559 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
560 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
561 DIR* dir = os::opendir(directory);
562 if (dir == NULL) return path;
563
564 char dir_sep[2] = { '\0', '\0' };
565 size_t directory_len = strlen(directory);
566 const char fileSep = *os::file_separator();
567 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
568
569 /* Scan the directory for jars/zips, appending them to path. */
570 struct dirent *entry;
571 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
572 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
573 const char* name = entry->d_name;
574 const char* ext = name + strlen(name) - 4;
575 bool isJarOrZip = ext > name &&
576 (os::file_name_strcmp(ext, ".jar") == 0 ||
577 os::file_name_strcmp(ext, ".zip") == 0);
578 if (isJarOrZip) {
579 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
580 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
581 path = add_to_path(path, jarpath, false);
582 FREE_C_HEAP_ARRAY(char, jarpath);
583 }
584 }
585 FREE_C_HEAP_ARRAY(char, dbuf);
586 os::closedir(dir);
587 return path;
588 }
589
590 // Parses a memory size specification string.
591 static bool atomull(const char *s, julong* result) {
592 julong n = 0;
593 int args_read = 0;
594 bool is_hex = false;
595 // Skip leading 0[xX] for hexadecimal
596 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) {
597 s += 2;
598 is_hex = true;
599 args_read = sscanf(s, JULONG_FORMAT_X, &n);
600 } else {
601 args_read = sscanf(s, JULONG_FORMAT, &n);
602 }
603 if (args_read != 1) {
604 return false;
605 }
606 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) {
607 s++;
608 }
609 // 4705540: illegal if more characters are found after the first non-digit
610 if (strlen(s) > 1) {
611 return false;
612 }
613 switch (*s) {
614 case 'T': case 't':
615 *result = n * G * K;
616 // Check for overflow.
617 if (*result/((julong)G * K) != n) return false;
618 return true;
619 case 'G': case 'g':
620 *result = n * G;
621 if (*result/G != n) return false;
622 return true;
623 case 'M': case 'm':
624 *result = n * M;
625 if (*result/M != n) return false;
626 return true;
627 case 'K': case 'k':
628 *result = n * K;
629 if (*result/K != n) return false;
630 return true;
631 case '\0':
632 *result = n;
633 return true;
634 default:
635 return false;
636 }
637 }
638
639 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
640 if (size < min_size) return arg_too_small;
641 // Check that size will fit in a size_t (only relevant on 32-bit)
642 if (size > max_uintx) return arg_too_big;
643 return arg_in_range;
644 }
645
646 // Describe an argument out of range error
647 void Arguments::describe_range_error(ArgsRange errcode) {
648 switch(errcode) {
649 case arg_too_big:
650 jio_fprintf(defaultStream::error_stream(),
651 "The specified size exceeds the maximum "
652 "representable size.\n");
653 break;
654 case arg_too_small:
655 case arg_unreadable:
656 case arg_in_range:
657 // do nothing for now
658 break;
659 default:
660 ShouldNotReachHere();
661 }
662 }
663
664 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) {
665 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) {
666 return true;
667 } else {
668 return false;
669 }
670 }
671
672 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) {
673 double v;
674 if (sscanf(value, "%lf", &v) != 1) {
675 return false;
676 }
677
678 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) {
679 return true;
680 }
681 return false;
682 }
683
684 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) {
685 julong v;
686 int int_v;
687 intx intx_v;
688 bool is_neg = false;
689 // Check the sign first since atomull() parses only unsigned values.
690 if (*value == '-') {
691 if ((CommandLineFlags::intxAt(name, &intx_v) != Flag::SUCCESS) && (CommandLineFlags::intAt(name, &int_v) != Flag::SUCCESS)) {
692 return false;
693 }
694 value++;
695 is_neg = true;
696 }
697 if (!atomull(value, &v)) {
698 return false;
699 }
700 int_v = (int) v;
701 if (is_neg) {
702 int_v = -int_v;
703 }
704 if (CommandLineFlags::intAtPut(name, &int_v, origin) == Flag::SUCCESS) {
705 return true;
706 }
707 uint uint_v = (uint) v;
708 if (!is_neg && CommandLineFlags::uintAtPut(name, &uint_v, origin) == Flag::SUCCESS) {
709 return true;
710 }
711 intx_v = (intx) v;
712 if (is_neg) {
713 intx_v = -intx_v;
714 }
715 if (CommandLineFlags::intxAtPut(name, &intx_v, origin) == Flag::SUCCESS) {
716 return true;
717 }
718 uintx uintx_v = (uintx) v;
719 if (!is_neg && (CommandLineFlags::uintxAtPut(name, &uintx_v, origin) == Flag::SUCCESS)) {
720 return true;
721 }
722 uint64_t uint64_t_v = (uint64_t) v;
723 if (!is_neg && (CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin) == Flag::SUCCESS)) {
724 return true;
725 }
726 size_t size_t_v = (size_t) v;
727 if (!is_neg && (CommandLineFlags::size_tAtPut(name, &size_t_v, origin) == Flag::SUCCESS)) {
728 return true;
729 }
730 return false;
731 }
732
733 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) {
734 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false;
735 // Contract: CommandLineFlags always returns a pointer that needs freeing.
736 FREE_C_HEAP_ARRAY(char, value);
737 return true;
738 }
739
740 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) {
741 const char* old_value = "";
742 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false;
743 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
744 size_t new_len = strlen(new_value);
745 const char* value;
746 char* free_this_too = NULL;
747 if (old_len == 0) {
748 value = new_value;
749 } else if (new_len == 0) {
750 value = old_value;
751 } else {
752 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
753 // each new setting adds another LINE to the switch:
754 sprintf(buf, "%s\n%s", old_value, new_value);
755 value = buf;
756 free_this_too = buf;
757 }
758 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
759 // CommandLineFlags always returns a pointer that needs freeing.
760 FREE_C_HEAP_ARRAY(char, value);
761 if (free_this_too != NULL) {
762 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
763 FREE_C_HEAP_ARRAY(char, free_this_too);
764 }
765 return true;
766 }
767
768 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) {
769 const char* real_name = real_flag_name(arg);
770 JDK_Version since = JDK_Version();
771 switch (is_deprecated_flag(arg, &since)) {
772 case -1:
773 return NULL;
774 case 0:
775 return real_name;
776 case 1: {
777 if (warn) {
778 char version[256];
779 since.to_string(version, sizeof(version));
780 if (real_name != arg) {
781 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.",
782 arg, version, real_name);
783 } else {
784 warning("Option %s was deprecated in version %s and will likely be removed in a future release.",
785 arg, version);
786 }
787 }
788 return real_name;
789 }
790 }
791 ShouldNotReachHere();
792 return NULL;
793 }
794
795 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) {
796
797 // range of acceptable characters spelled out for portability reasons
798 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
799 #define BUFLEN 255
800 char name[BUFLEN+1];
801 char dummy;
802 const char* real_name;
803 bool warn_if_deprecated = true;
804
805 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
806 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
807 if (real_name == NULL) {
808 return false; // "name" is a deprecated option that has expired.
809 }
810 return set_bool_flag(real_name, false, origin);
811 }
812 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
813 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
814 if (real_name == NULL) {
815 return false;
816 }
817 return set_bool_flag(real_name, true, origin);
818 }
819
820 char punct;
821 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
822 const char* value = strchr(arg, '=') + 1;
823 Flag* flag;
824
825 // this scanf pattern matches both strings (handled here) and numbers (handled later))
826 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
827 if (real_name == NULL) {
828 return false;
829 }
830 flag = Flag::find_flag(real_name);
831 if (flag != NULL && flag->is_ccstr()) {
832 if (flag->ccstr_accumulates()) {
833 return append_to_string_flag(real_name, value, origin);
834 } else {
835 if (value[0] == '\0') {
836 value = NULL;
837 }
838 return set_string_flag(real_name, value, origin);
839 }
840 } else {
841 warn_if_deprecated = false; // if arg is deprecated, we've already done warning...
842 }
843 }
844
845 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
846 const char* value = strchr(arg, '=') + 1;
847 // -XX:Foo:=xxx will reset the string flag to the given value.
848 if (value[0] == '\0') {
849 value = NULL;
850 }
851 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
852 if (real_name == NULL) {
853 return false;
854 }
855 return set_string_flag(real_name, value, origin);
856 }
857
858 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
859 #define SIGNED_NUMBER_RANGE "[-0123456789]"
860 #define NUMBER_RANGE "[0123456789]"
861 char value[BUFLEN + 1];
862 char value2[BUFLEN + 1];
863 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
864 // Looks like a floating-point number -- try again with more lenient format string
865 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
866 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
867 if (real_name == NULL) {
868 return false;
869 }
870 return set_fp_numeric_flag(real_name, value, origin);
871 }
872 }
873
874 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]"
875 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
876 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated);
877 if (real_name == NULL) {
878 return false;
879 }
880 return set_numeric_flag(real_name, value, origin);
881 }
882
883 return false;
884 }
885
886 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
887 assert(bldarray != NULL, "illegal argument");
888
889 if (arg == NULL) {
890 return;
891 }
892
893 int new_count = *count + 1;
894
895 // expand the array and add arg to the last element
896 if (*bldarray == NULL) {
897 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
898 } else {
899 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
900 }
901 (*bldarray)[*count] = os::strdup_check_oom(arg);
902 *count = new_count;
903 }
904
905 void Arguments::build_jvm_args(const char* arg) {
906 add_string(&_jvm_args_array, &_num_jvm_args, arg);
907 }
908
909 void Arguments::build_jvm_flags(const char* arg) {
910 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
911 }
912
913 // utility function to return a string that concatenates all
914 // strings in a given char** array
915 const char* Arguments::build_resource_string(char** args, int count) {
916 if (args == NULL || count == 0) {
917 return NULL;
918 }
919 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
920 for (int i = 1; i < count; i++) {
921 length += strlen(args[i]) + 1; // add 1 for a space
922 }
923 char* s = NEW_RESOURCE_ARRAY(char, length);
924 strcpy(s, args[0]);
925 for (int j = 1; j < count; j++) {
926 strcat(s, " ");
927 strcat(s, args[j]);
928 }
929 return (const char*) s;
930 }
931
932 void Arguments::print_on(outputStream* st) {
933 st->print_cr("VM Arguments:");
934 if (num_jvm_flags() > 0) {
935 st->print("jvm_flags: "); print_jvm_flags_on(st);
936 st->cr();
937 }
938 if (num_jvm_args() > 0) {
939 st->print("jvm_args: "); print_jvm_args_on(st);
940 st->cr();
941 }
942 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
943 if (_java_class_path != NULL) {
944 char* path = _java_class_path->value();
945 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
946 }
947 st->print_cr("Launcher Type: %s", _sun_java_launcher);
948 }
949
950 void Arguments::print_summary_on(outputStream* st) {
951 // Print the command line. Environment variables that are helpful for
952 // reproducing the problem are written later in the hs_err file.
953 // flags are from setting file
954 if (num_jvm_flags() > 0) {
955 st->print_raw("Settings File: ");
956 print_jvm_flags_on(st);
957 st->cr();
958 }
959 // args are the command line and environment variable arguments.
960 st->print_raw("Command Line: ");
961 if (num_jvm_args() > 0) {
962 print_jvm_args_on(st);
963 }
964 // this is the classfile and any arguments to the java program
965 if (java_command() != NULL) {
966 st->print("%s", java_command());
967 }
968 st->cr();
969 }
970
971 void Arguments::print_jvm_flags_on(outputStream* st) {
972 if (_num_jvm_flags > 0) {
973 for (int i=0; i < _num_jvm_flags; i++) {
974 st->print("%s ", _jvm_flags_array[i]);
975 }
976 }
977 }
978
979 void Arguments::print_jvm_args_on(outputStream* st) {
980 if (_num_jvm_args > 0) {
981 for (int i=0; i < _num_jvm_args; i++) {
982 st->print("%s ", _jvm_args_array[i]);
983 }
984 }
985 }
986
987 bool Arguments::process_argument(const char* arg,
988 jboolean ignore_unrecognized,
989 Flag::Flags origin) {
990 JDK_Version since = JDK_Version();
991
992 if (parse_argument(arg, origin) || ignore_unrecognized) {
993 return true;
994 }
995
996 // Determine if the flag has '+', '-', or '=' characters.
997 bool has_plus_minus = (*arg == '+' || *arg == '-');
998 const char* const argname = has_plus_minus ? arg + 1 : arg;
999
1000 size_t arg_len;
1001 const char* equal_sign = strchr(argname, '=');
1002 if (equal_sign == NULL) {
1003 arg_len = strlen(argname);
1004 } else {
1005 arg_len = equal_sign - argname;
1006 }
1007
1008 // Only make the obsolete check for valid arguments.
1009 if (arg_len <= BUFLEN) {
1010 // Construct a string which consists only of the argument name without '+', '-', or '='.
1011 char stripped_argname[BUFLEN+1];
1012 strncpy(stripped_argname, argname, arg_len);
1013 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate.
1014
1015 if (is_newly_obsolete(stripped_argname, &since)) {
1016 char version[256];
1017 since.to_string(version, sizeof(version));
1018 warning("Ignoring option %s; support was removed in %s", stripped_argname, version);
1019 return true;
1020 }
1021 }
1022
1023 // For locked flags, report a custom error message if available.
1024 // Otherwise, report the standard unrecognized VM option.
1025 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true);
1026 if (found_flag != NULL) {
1027 char locked_message_buf[BUFLEN];
1028 found_flag->get_locked_message(locked_message_buf, BUFLEN);
1029 if (strlen(locked_message_buf) == 0) {
1030 if (found_flag->is_bool() && !has_plus_minus) {
1031 jio_fprintf(defaultStream::error_stream(),
1032 "Missing +/- setting for VM option '%s'\n", argname);
1033 } else if (!found_flag->is_bool() && has_plus_minus) {
1034 jio_fprintf(defaultStream::error_stream(),
1035 "Unexpected +/- setting in VM option '%s'\n", argname);
1036 } else {
1037 jio_fprintf(defaultStream::error_stream(),
1038 "Improperly specified VM option '%s'\n", argname);
1039 }
1040 } else {
1041 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
1042 }
1043 } else {
1044 jio_fprintf(defaultStream::error_stream(),
1045 "Unrecognized VM option '%s'\n", argname);
1046 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
1047 if (fuzzy_matched != NULL) {
1048 jio_fprintf(defaultStream::error_stream(),
1049 "Did you mean '%s%s%s'? ",
1050 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
1051 fuzzy_matched->_name,
1052 (fuzzy_matched->is_bool()) ? "" : "=<value>");
1053 }
1054 }
1055
1056 // allow for commandline "commenting out" options like -XX:#+Verbose
1057 return arg[0] == '#';
1058 }
1059
1060 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
1061 FILE* stream = fopen(file_name, "rb");
1062 if (stream == NULL) {
1063 if (should_exist) {
1064 jio_fprintf(defaultStream::error_stream(),
1065 "Could not open settings file %s\n", file_name);
1066 return false;
1067 } else {
1068 return true;
1069 }
1070 }
1071
1072 char token[1024];
1073 int pos = 0;
1074
1075 bool in_white_space = true;
1076 bool in_comment = false;
1077 bool in_quote = false;
1078 char quote_c = 0;
1079 bool result = true;
1080
1081 int c = getc(stream);
1082 while(c != EOF && pos < (int)(sizeof(token)-1)) {
1083 if (in_white_space) {
1084 if (in_comment) {
1085 if (c == '\n') in_comment = false;
1086 } else {
1087 if (c == '#') in_comment = true;
1088 else if (!isspace(c)) {
1089 in_white_space = false;
1090 token[pos++] = c;
1091 }
1092 }
1093 } else {
1094 if (c == '\n' || (!in_quote && isspace(c))) {
1095 // token ends at newline, or at unquoted whitespace
1096 // this allows a way to include spaces in string-valued options
1097 token[pos] = '\0';
1098 logOption(token);
1099 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1100 build_jvm_flags(token);
1101 pos = 0;
1102 in_white_space = true;
1103 in_quote = false;
1104 } else if (!in_quote && (c == '\'' || c == '"')) {
1105 in_quote = true;
1106 quote_c = c;
1107 } else if (in_quote && (c == quote_c)) {
1108 in_quote = false;
1109 } else {
1110 token[pos++] = c;
1111 }
1112 }
1113 c = getc(stream);
1114 }
1115 if (pos > 0) {
1116 token[pos] = '\0';
1117 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE);
1118 build_jvm_flags(token);
1119 }
1120 fclose(stream);
1121 return result;
1122 }
1123
1124 //=============================================================================================================
1125 // Parsing of properties (-D)
1126
1127 const char* Arguments::get_property(const char* key) {
1128 return PropertyList_get_value(system_properties(), key);
1129 }
1130
1131 bool Arguments::add_property(const char* prop) {
1132 const char* eq = strchr(prop, '=');
1133 char* key;
1134 // ns must be static--its address may be stored in a SystemProperty object.
1135 const static char ns[1] = {0};
1136 char* value = (char *)ns;
1137
1138 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
1139 key = AllocateHeap(key_len + 1, mtInternal);
1140 strncpy(key, prop, key_len);
1141 key[key_len] = '\0';
1142
1143 if (eq != NULL) {
1144 size_t value_len = strlen(prop) - key_len - 1;
1145 value = AllocateHeap(value_len + 1, mtInternal);
1146 strncpy(value, &prop[key_len + 1], value_len + 1);
1147 }
1148
1149 if (strcmp(key, "java.compiler") == 0) {
1150 process_java_compiler_argument(value);
1151 FreeHeap(key);
1152 if (eq != NULL) {
1153 FreeHeap(value);
1154 }
1155 return true;
1156 } else if (strcmp(key, "sun.java.command") == 0) {
1157 _java_command = value;
1158
1159 // Record value in Arguments, but let it get passed to Java.
1160 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 ||
1161 strcmp(key, "sun.java.launcher.pid") == 0) {
1162 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are
1163 // private and are processed in process_sun_java_launcher_properties();
1164 // the sun.java.launcher property is passed on to the java application
1165 FreeHeap(key);
1166 if (eq != NULL) {
1167 FreeHeap(value);
1168 }
1169 return true;
1170 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1171 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1172 // its value without going through the property list or making a Java call.
1173 _java_vendor_url_bug = value;
1174 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1175 PropertyList_unique_add(&_system_properties, key, value, true);
1176 return true;
1177 }
1178 // Create new property and add at the end of the list
1179 PropertyList_unique_add(&_system_properties, key, value);
1180 return true;
1181 }
1182
1183 //===========================================================================================================
1184 // Setting int/mixed/comp mode flags
1185
1186 void Arguments::set_mode_flags(Mode mode) {
1187 // Set up default values for all flags.
1188 // If you add a flag to any of the branches below,
1189 // add a default value for it here.
1190 set_java_compiler(false);
1191 _mode = mode;
1192
1193 // Ensure Agent_OnLoad has the correct initial values.
1194 // This may not be the final mode; mode may change later in onload phase.
1195 PropertyList_unique_add(&_system_properties, "java.vm.info",
1196 (char*)VM_Version::vm_info_string(), false);
1197
1198 UseInterpreter = true;
1199 UseCompiler = true;
1200 UseLoopCounter = true;
1201
1202 // Default values may be platform/compiler dependent -
1203 // use the saved values
1204 ClipInlining = Arguments::_ClipInlining;
1205 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1206 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1207 BackgroundCompilation = Arguments::_BackgroundCompilation;
1208 if (TieredCompilation) {
1209 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) {
1210 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog;
1211 }
1212 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) {
1213 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold;
1214 }
1215 }
1216
1217 // Change from defaults based on mode
1218 switch (mode) {
1219 default:
1220 ShouldNotReachHere();
1221 break;
1222 case _int:
1223 UseCompiler = false;
1224 UseLoopCounter = false;
1225 AlwaysCompileLoopMethods = false;
1226 UseOnStackReplacement = false;
1227 break;
1228 case _mixed:
1229 // same as default
1230 break;
1231 case _comp:
1232 UseInterpreter = false;
1233 BackgroundCompilation = false;
1234 ClipInlining = false;
1235 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1236 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1237 // compile a level 4 (C2) and then continue executing it.
1238 if (TieredCompilation) {
1239 Tier3InvokeNotifyFreqLog = 0;
1240 Tier4InvocationThreshold = 0;
1241 }
1242 break;
1243 }
1244 }
1245
1246 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS
1247 // Conflict: required to use shared spaces (-Xshare:on), but
1248 // incompatible command line options were chosen.
1249
1250 static void no_shared_spaces(const char* message) {
1251 if (RequireSharedSpaces) {
1252 jio_fprintf(defaultStream::error_stream(),
1253 "Class data sharing is inconsistent with other specified options.\n");
1254 vm_exit_during_initialization("Unable to use shared archive.", message);
1255 } else {
1256 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1257 }
1258 }
1259 #endif
1260
1261 // Returns threshold scaled with the value of scale.
1262 // If scale < 0.0, threshold is returned without scaling.
1263 intx Arguments::scaled_compile_threshold(intx threshold, double scale) {
1264 if (scale == 1.0 || scale < 0.0) {
1265 return threshold;
1266 } else {
1267 return (intx)(threshold * scale);
1268 }
1269 }
1270
1271 // Returns freq_log scaled with the value of scale.
1272 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1].
1273 // If scale < 0.0, freq_log is returned without scaling.
1274 intx Arguments::scaled_freq_log(intx freq_log, double scale) {
1275 // Check if scaling is necessary or if negative value was specified.
1276 if (scale == 1.0 || scale < 0.0) {
1277 return freq_log;
1278 }
1279 // Check values to avoid calculating log2 of 0.
1280 if (scale == 0.0 || freq_log == 0) {
1281 return 0;
1282 }
1283 // Determine the maximum notification frequency value currently supported.
1284 // The largest mask value that the interpreter/C1 can handle is
1285 // of length InvocationCounter::number_of_count_bits. Mask values are always
1286 // one bit shorter then the value of the notification frequency. Set
1287 // max_freq_bits accordingly.
1288 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1;
1289 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale);
1290 if (scaled_freq == 0) {
1291 // Return 0 right away to avoid calculating log2 of 0.
1292 return 0;
1293 } else if (scaled_freq > nth_bit(max_freq_bits)) {
1294 return max_freq_bits;
1295 } else {
1296 return log2_intptr(scaled_freq);
1297 }
1298 }
1299
1300 void Arguments::set_tiered_flags() {
1301 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1302 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1303 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1304 }
1305 if (CompilationPolicyChoice < 2) {
1306 vm_exit_during_initialization(
1307 "Incompatible compilation policy selected", NULL);
1308 }
1309 // Increase the code cache size - tiered compiles a lot more.
1310 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1311 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize,
1312 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5));
1313 }
1314 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M
1315 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) {
1316 FLAG_SET_ERGO(bool, SegmentedCodeCache, true);
1317
1318 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1319 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap)
1320 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) {
1321 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1322 }
1323 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) {
1324 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2);
1325 }
1326 // Check consistency of code heap sizes
1327 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
1328 jio_fprintf(defaultStream::error_stream(),
1329 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
1330 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
1331 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
1332 vm_exit(1);
1333 }
1334 }
1335 }
1336 if (!UseInterpreter) { // -Xcomp
1337 Tier3InvokeNotifyFreqLog = 0;
1338 Tier4InvocationThreshold = 0;
1339 }
1340
1341 if (CompileThresholdScaling < 0) {
1342 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL);
1343 }
1344
1345 // Scale tiered compilation thresholds.
1346 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged.
1347 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
1348 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog));
1349 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog));
1350
1351 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold));
1352 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold));
1353 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold));
1354 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold));
1355
1356 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here
1357 // once these thresholds become supported.
1358
1359 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog));
1360 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog));
1361
1362 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog));
1363 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog));
1364
1365 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog));
1366
1367 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold));
1368 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold));
1369 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold));
1370 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold));
1371 }
1372 }
1373
1374 #if INCLUDE_ALL_GCS
1375 static void disable_adaptive_size_policy(const char* collector_name) {
1376 if (UseAdaptiveSizePolicy) {
1377 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1378 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1379 collector_name);
1380 }
1381 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1382 }
1383 }
1384
1385 void Arguments::set_parnew_gc_flags() {
1386 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1387 "control point invariant");
1388 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1389 assert(UseParNewGC, "ParNew should always be used with CMS");
1390
1391 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1392 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1393 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1394 } else if (ParallelGCThreads == 0) {
1395 jio_fprintf(defaultStream::error_stream(),
1396 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1397 vm_exit(1);
1398 }
1399
1400 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1401 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1402 // we set them to 1024 and 1024.
1403 // See CR 6362902.
1404 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1405 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1406 }
1407 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1408 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1409 }
1410
1411 // When using compressed oops, we use local overflow stacks,
1412 // rather than using a global overflow list chained through
1413 // the klass word of the object's pre-image.
1414 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1415 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1416 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1417 }
1418 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1419 }
1420 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1421 }
1422
1423 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1424 // sparc/solaris for certain applications, but would gain from
1425 // further optimization and tuning efforts, and would almost
1426 // certainly gain from analysis of platform and environment.
1427 void Arguments::set_cms_and_parnew_gc_flags() {
1428 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1429 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1430 assert(UseParNewGC, "ParNew should always be used with CMS");
1431
1432 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1433 disable_adaptive_size_policy("UseConcMarkSweepGC");
1434
1435 set_parnew_gc_flags();
1436
1437 size_t max_heap = align_size_down(MaxHeapSize,
1438 CardTableRS::ct_max_alignment_constraint());
1439
1440 // Now make adjustments for CMS
1441 intx tenuring_default = (intx)6;
1442 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1443
1444 // Preferred young gen size for "short" pauses:
1445 // upper bound depends on # of threads and NewRatio.
1446 const size_t preferred_max_new_size_unaligned =
1447 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads));
1448 size_t preferred_max_new_size =
1449 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1450
1451 // Unless explicitly requested otherwise, size young gen
1452 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1453
1454 // If either MaxNewSize or NewRatio is set on the command line,
1455 // assume the user is trying to set the size of the young gen.
1456 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1457
1458 // Set MaxNewSize to our calculated preferred_max_new_size unless
1459 // NewSize was set on the command line and it is larger than
1460 // preferred_max_new_size.
1461 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1462 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1463 } else {
1464 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size);
1465 }
1466 if (PrintGCDetails && Verbose) {
1467 // Too early to use gclog_or_tty
1468 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1469 }
1470
1471 // Code along this path potentially sets NewSize and OldSize
1472 if (PrintGCDetails && Verbose) {
1473 // Too early to use gclog_or_tty
1474 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1475 " initial_heap_size: " SIZE_FORMAT
1476 " max_heap: " SIZE_FORMAT,
1477 min_heap_size(), InitialHeapSize, max_heap);
1478 }
1479 size_t min_new = preferred_max_new_size;
1480 if (FLAG_IS_CMDLINE(NewSize)) {
1481 min_new = NewSize;
1482 }
1483 if (max_heap > min_new && min_heap_size() > min_new) {
1484 // Unless explicitly requested otherwise, make young gen
1485 // at least min_new, and at most preferred_max_new_size.
1486 if (FLAG_IS_DEFAULT(NewSize)) {
1487 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new));
1488 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize));
1489 if (PrintGCDetails && Verbose) {
1490 // Too early to use gclog_or_tty
1491 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1492 }
1493 }
1494 // Unless explicitly requested otherwise, size old gen
1495 // so it's NewRatio x of NewSize.
1496 if (FLAG_IS_DEFAULT(OldSize)) {
1497 if (max_heap > NewSize) {
1498 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1499 if (PrintGCDetails && Verbose) {
1500 // Too early to use gclog_or_tty
1501 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1502 }
1503 }
1504 }
1505 }
1506 }
1507 // Unless explicitly requested otherwise, definitely
1508 // promote all objects surviving "tenuring_default" scavenges.
1509 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1510 FLAG_IS_DEFAULT(SurvivorRatio)) {
1511 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1512 }
1513 // If we decided above (or user explicitly requested)
1514 // `promote all' (via MaxTenuringThreshold := 0),
1515 // prefer minuscule survivor spaces so as not to waste
1516 // space for (non-existent) survivors
1517 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1518 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1519 }
1520
1521 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words,
1522 // but rather the number of free blocks of a given size that are used when
1523 // replenishing the local per-worker free list caches.
1524 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1525 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1526 // OldPLAB sizing manually turned off: Use a larger default setting,
1527 // unless it was manually specified. This is because a too-low value
1528 // will slow down scavenges.
1529 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166
1530 } else {
1531 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default
1532 }
1533 }
1534
1535 // If either of the static initialization defaults have changed, note this
1536 // modification.
1537 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1538 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1539 }
1540
1541 if (!ClassUnloading) {
1542 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false);
1543 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false);
1544 }
1545
1546 if (PrintGCDetails && Verbose) {
1547 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1548 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1549 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1550 }
1551 }
1552 #endif // INCLUDE_ALL_GCS
1553
1554 void set_object_alignment() {
1555 // Object alignment.
1556 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1557 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1558 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1559 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1560 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1561 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1562
1563 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1564 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1565
1566 // Oop encoding heap max
1567 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1568
1569 if (SurvivorAlignmentInBytes == 0) {
1570 SurvivorAlignmentInBytes = ObjectAlignmentInBytes;
1571 }
1572
1573 #if INCLUDE_ALL_GCS
1574 // Set CMS global values
1575 CompactibleFreeListSpace::set_cms_values();
1576 #endif // INCLUDE_ALL_GCS
1577 }
1578
1579 size_t Arguments::max_heap_for_compressed_oops() {
1580 // Avoid sign flip.
1581 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1582 // We need to fit both the NULL page and the heap into the memory budget, while
1583 // keeping alignment constraints of the heap. To guarantee the latter, as the
1584 // NULL page is located before the heap, we pad the NULL page to the conservative
1585 // maximum alignment that the GC may ever impose upon the heap.
1586 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(),
1587 _conservative_max_heap_alignment);
1588
1589 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page);
1590 NOT_LP64(ShouldNotReachHere(); return 0);
1591 }
1592
1593 bool Arguments::should_auto_select_low_pause_collector() {
1594 if (UseAutoGCSelectPolicy &&
1595 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1596 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1597 if (PrintGCDetails) {
1598 // Cannot use gclog_or_tty yet.
1599 tty->print_cr("Automatic selection of the low pause collector"
1600 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis);
1601 }
1602 return true;
1603 }
1604 return false;
1605 }
1606
1607 void Arguments::set_use_compressed_oops() {
1608 #ifndef ZERO
1609 #ifdef _LP64
1610 // MaxHeapSize is not set up properly at this point, but
1611 // the only value that can override MaxHeapSize if we are
1612 // to use UseCompressedOops is InitialHeapSize.
1613 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1614
1615 if (max_heap_size <= max_heap_for_compressed_oops()) {
1616 #if !defined(COMPILER1) || defined(TIERED)
1617 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1618 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1619 }
1620 #endif
1621 } else {
1622 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1623 warning("Max heap size too large for Compressed Oops");
1624 FLAG_SET_DEFAULT(UseCompressedOops, false);
1625 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1626 }
1627 }
1628 #endif // _LP64
1629 #endif // ZERO
1630 }
1631
1632
1633 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1634 // set_use_compressed_oops().
1635 void Arguments::set_use_compressed_klass_ptrs() {
1636 #ifndef ZERO
1637 #ifdef _LP64
1638 // UseCompressedOops must be on for UseCompressedClassPointers to be on.
1639 if (!UseCompressedOops) {
1640 if (UseCompressedClassPointers) {
1641 warning("UseCompressedClassPointers requires UseCompressedOops");
1642 }
1643 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1644 } else {
1645 // Turn on UseCompressedClassPointers too
1646 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) {
1647 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true);
1648 }
1649 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs.
1650 if (UseCompressedClassPointers) {
1651 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) {
1652 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers");
1653 FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
1654 }
1655 }
1656 }
1657 #endif // _LP64
1658 #endif // !ZERO
1659 }
1660
1661 void Arguments::set_conservative_max_heap_alignment() {
1662 // The conservative maximum required alignment for the heap is the maximum of
1663 // the alignments imposed by several sources: any requirements from the heap
1664 // itself, the collector policy and the maximum page size we may run the VM
1665 // with.
1666 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment();
1667 #if INCLUDE_ALL_GCS
1668 if (UseParallelGC) {
1669 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment();
1670 } else if (UseG1GC) {
1671 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment();
1672 }
1673 #endif // INCLUDE_ALL_GCS
1674 _conservative_max_heap_alignment = MAX4(heap_alignment,
1675 (size_t)os::vm_allocation_granularity(),
1676 os::max_page_size(),
1677 CollectorPolicy::compute_heap_alignment());
1678 }
1679
1680 void Arguments::select_gc_ergonomically() {
1681 if (os::is_server_class_machine()) {
1682 if (should_auto_select_low_pause_collector()) {
1683 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1684 } else {
1685 #if defined(JAVASE_EMBEDDED)
1686 FLAG_SET_ERGO(bool, UseParallelGC, true);
1687 #else
1688 FLAG_SET_ERGO(bool, UseG1GC, true);
1689 #endif
1690 }
1691 } else {
1692 FLAG_SET_ERGO(bool, UseSerialGC, true);
1693 }
1694 }
1695
1696 void Arguments::select_gc() {
1697 if (!gc_selected()) {
1698 select_gc_ergonomically();
1699 guarantee(gc_selected(), "No GC selected");
1700 }
1701 }
1702
1703 void Arguments::set_ergonomics_flags() {
1704 select_gc();
1705
1706 #ifdef COMPILER2
1707 // Shared spaces work fine with other GCs but causes bytecode rewriting
1708 // to be disabled, which hurts interpreter performance and decreases
1709 // server performance. When -server is specified, keep the default off
1710 // unless it is asked for. Future work: either add bytecode rewriting
1711 // at link time, or rewrite bytecodes in non-shared methods.
1712 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1713 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1714 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on.");
1715 }
1716 #endif
1717
1718 set_conservative_max_heap_alignment();
1719
1720 #ifndef ZERO
1721 #ifdef _LP64
1722 set_use_compressed_oops();
1723
1724 // set_use_compressed_klass_ptrs() must be called after calling
1725 // set_use_compressed_oops().
1726 set_use_compressed_klass_ptrs();
1727
1728 // Also checks that certain machines are slower with compressed oops
1729 // in vm_version initialization code.
1730 #endif // _LP64
1731 #endif // !ZERO
1732
1733 // Set up runtime image flags.
1734 set_runtime_image_flags();
1735
1736 CodeCacheExtensions::set_ergonomics_flags();
1737 }
1738
1739 void Arguments::set_parallel_gc_flags() {
1740 assert(UseParallelGC || UseParallelOldGC, "Error");
1741 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1742 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1743 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1744 }
1745 FLAG_SET_DEFAULT(UseParallelGC, true);
1746
1747 // If no heap maximum was requested explicitly, use some reasonable fraction
1748 // of the physical memory, up to a maximum of 1GB.
1749 FLAG_SET_DEFAULT(ParallelGCThreads,
1750 Abstract_VM_Version::parallel_worker_threads());
1751 if (ParallelGCThreads == 0) {
1752 jio_fprintf(defaultStream::error_stream(),
1753 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1754 vm_exit(1);
1755 }
1756
1757 if (UseAdaptiveSizePolicy) {
1758 // We don't want to limit adaptive heap sizing's freedom to adjust the heap
1759 // unless the user actually sets these flags.
1760 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
1761 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
1762 _min_heap_free_ratio = MinHeapFreeRatio;
1763 }
1764 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
1765 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
1766 _max_heap_free_ratio = MaxHeapFreeRatio;
1767 }
1768 }
1769
1770 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1771 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1772 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1773 // See CR 6362902 for details.
1774 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1775 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1776 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1777 }
1778 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1779 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1780 }
1781 }
1782
1783 if (UseParallelOldGC) {
1784 // Par compact uses lower default values since they are treated as
1785 // minimums. These are different defaults because of the different
1786 // interpretation and are not ergonomically set.
1787 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1788 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1789 }
1790 }
1791 }
1792
1793 void Arguments::set_g1_gc_flags() {
1794 assert(UseG1GC, "Error");
1795 #ifdef COMPILER1
1796 FastTLABRefill = false;
1797 #endif
1798 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1799 if (ParallelGCThreads == 0) {
1800 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0.");
1801 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL);
1802 }
1803
1804 #if INCLUDE_ALL_GCS
1805 if (G1ConcRefinementThreads == 0) {
1806 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads);
1807 }
1808 #endif
1809
1810 // MarkStackSize will be set (if it hasn't been set by the user)
1811 // when concurrent marking is initialized.
1812 // Its value will be based upon the number of parallel marking threads.
1813 // But we do set the maximum mark stack size here.
1814 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1815 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1816 }
1817
1818 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1819 // In G1, we want the default GC overhead goal to be higher than
1820 // say in PS. So we set it here to 10%. Otherwise the heap might
1821 // be expanded more aggressively than we would like it to. In
1822 // fact, even 10% seems to not be high enough in some cases
1823 // (especially small GC stress tests that the main thing they do
1824 // is allocation). We might consider increase it further.
1825 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1826 }
1827
1828 if (PrintGCDetails && Verbose) {
1829 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1830 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
1831 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1832 }
1833 }
1834
1835 #if !INCLUDE_ALL_GCS
1836 #ifdef ASSERT
1837 static bool verify_serial_gc_flags() {
1838 return (UseSerialGC &&
1839 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC ||
1840 UseParallelGC || UseParallelOldGC));
1841 }
1842 #endif // ASSERT
1843 #endif // INCLUDE_ALL_GCS
1844
1845 void Arguments::set_gc_specific_flags() {
1846 #if INCLUDE_ALL_GCS
1847 // Set per-collector flags
1848 if (UseParallelGC || UseParallelOldGC) {
1849 set_parallel_gc_flags();
1850 } else if (UseConcMarkSweepGC) {
1851 set_cms_and_parnew_gc_flags();
1852 } else if (UseG1GC) {
1853 set_g1_gc_flags();
1854 }
1855 if (AssumeMP && !UseSerialGC) {
1856 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
1857 warning("If the number of processors is expected to increase from one, then"
1858 " you should configure the number of parallel GC threads appropriately"
1859 " using -XX:ParallelGCThreads=N");
1860 }
1861 }
1862 if (MinHeapFreeRatio == 100) {
1863 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1864 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99);
1865 }
1866 #else // INCLUDE_ALL_GCS
1867 assert(verify_serial_gc_flags(), "SerialGC unset");
1868 #endif // INCLUDE_ALL_GCS
1869 }
1870
1871 julong Arguments::limit_by_allocatable_memory(julong limit) {
1872 julong max_allocatable;
1873 julong result = limit;
1874 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1875 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1876 }
1877 return result;
1878 }
1879
1880 // Use static initialization to get the default before parsing
1881 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress;
1882
1883 void Arguments::set_heap_size() {
1884 const julong phys_mem =
1885 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1886 : (julong)MaxRAM;
1887
1888 // If the maximum heap size has not been set with -Xmx,
1889 // then set it as fraction of the size of physical memory,
1890 // respecting the maximum and minimum sizes of the heap.
1891 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1892 julong reasonable_max = phys_mem / MaxRAMFraction;
1893
1894 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1895 // Small physical memory, so use a minimum fraction of it for the heap
1896 reasonable_max = phys_mem / MinRAMFraction;
1897 } else {
1898 // Not-small physical memory, so require a heap at least
1899 // as large as MaxHeapSize
1900 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1901 }
1902 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1903 // Limit the heap size to ErgoHeapSizeLimit
1904 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1905 }
1906 if (UseCompressedOops) {
1907 // Limit the heap size to the maximum possible when using compressed oops
1908 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1909
1910 // HeapBaseMinAddress can be greater than default but not less than.
1911 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) {
1912 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) {
1913 // matches compressed oops printing flags
1914 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
1915 jio_fprintf(defaultStream::error_stream(),
1916 "HeapBaseMinAddress must be at least " SIZE_FORMAT
1917 " (" SIZE_FORMAT "G) which is greater than value given "
1918 SIZE_FORMAT "\n",
1919 DefaultHeapBaseMinAddress,
1920 DefaultHeapBaseMinAddress/G,
1921 HeapBaseMinAddress);
1922 }
1923 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress);
1924 }
1925 }
1926
1927 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1928 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1929 // but it should be not less than default MaxHeapSize.
1930 max_coop_heap -= HeapBaseMinAddress;
1931 }
1932 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1933 }
1934 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1935
1936 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1937 // An initial heap size was specified on the command line,
1938 // so be sure that the maximum size is consistent. Done
1939 // after call to limit_by_allocatable_memory because that
1940 // method might reduce the allocation size.
1941 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1942 }
1943
1944 if (PrintGCDetails && Verbose) {
1945 // Cannot use gclog_or_tty yet.
1946 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max);
1947 }
1948 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max);
1949 }
1950
1951 // If the minimum or initial heap_size have not been set or requested to be set
1952 // ergonomically, set them accordingly.
1953 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1954 julong reasonable_minimum = (julong)(OldSize + NewSize);
1955
1956 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1957
1958 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1959
1960 if (InitialHeapSize == 0) {
1961 julong reasonable_initial = phys_mem / InitialRAMFraction;
1962
1963 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1964 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1965
1966 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1967
1968 if (PrintGCDetails && Verbose) {
1969 // Cannot use gclog_or_tty yet.
1970 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial);
1971 }
1972 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial);
1973 }
1974 // If the minimum heap size has not been set (via -Xms),
1975 // synchronize with InitialHeapSize to avoid errors with the default value.
1976 if (min_heap_size() == 0) {
1977 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize));
1978 if (PrintGCDetails && Verbose) {
1979 // Cannot use gclog_or_tty yet.
1980 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1981 }
1982 }
1983 }
1984 }
1985
1986 // This option inspects the machine and attempts to set various
1987 // parameters to be optimal for long-running, memory allocation
1988 // intensive jobs. It is intended for machines with large
1989 // amounts of cpu and memory.
1990 jint Arguments::set_aggressive_heap_flags() {
1991 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
1992 // VM, but we may not be able to represent the total physical memory
1993 // available (like having 8gb of memory on a box but using a 32bit VM).
1994 // Thus, we need to make sure we're using a julong for intermediate
1995 // calculations.
1996 julong initHeapSize;
1997 julong total_memory = os::physical_memory();
1998
1999 if (total_memory < (julong) 256 * M) {
2000 jio_fprintf(defaultStream::error_stream(),
2001 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2002 vm_exit(1);
2003 }
2004
2005 // The heap size is half of available memory, or (at most)
2006 // all of possible memory less 160mb (leaving room for the OS
2007 // when using ISM). This is the maximum; because adaptive sizing
2008 // is turned on below, the actual space used may be smaller.
2009
2010 initHeapSize = MIN2(total_memory / (julong) 2,
2011 total_memory - (julong) 160 * M);
2012
2013 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2014
2015 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2016 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) {
2017 return JNI_EINVAL;
2018 }
2019 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) {
2020 return JNI_EINVAL;
2021 }
2022 // Currently the minimum size and the initial heap sizes are the same.
2023 set_min_heap_size(initHeapSize);
2024 }
2025 if (FLAG_IS_DEFAULT(NewSize)) {
2026 // Make the young generation 3/8ths of the total heap.
2027 if (FLAG_SET_CMDLINE(size_t, NewSize,
2028 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) {
2029 return JNI_EINVAL;
2030 }
2031 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) {
2032 return JNI_EINVAL;
2033 }
2034 }
2035
2036 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
2037 FLAG_SET_DEFAULT(UseLargePages, true);
2038 #endif
2039
2040 // Increase some data structure sizes for efficiency
2041 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) {
2042 return JNI_EINVAL;
2043 }
2044 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) {
2045 return JNI_EINVAL;
2046 }
2047 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) {
2048 return JNI_EINVAL;
2049 }
2050
2051 // See the OldPLABSize comment below, but replace 'after promotion'
2052 // with 'after copying'. YoungPLABSize is the size of the survivor
2053 // space per-gc-thread buffers. The default is 4kw.
2054 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words
2055 return JNI_EINVAL;
2056 }
2057
2058 // OldPLABSize is the size of the buffers in the old gen that
2059 // UseParallelGC uses to promote live data that doesn't fit in the
2060 // survivor spaces. At any given time, there's one for each gc thread.
2061 // The default size is 1kw. These buffers are rarely used, since the
2062 // survivor spaces are usually big enough. For specjbb, however, there
2063 // are occasions when there's lots of live data in the young gen
2064 // and we end up promoting some of it. We don't have a definite
2065 // explanation for why bumping OldPLABSize helps, but the theory
2066 // is that a bigger PLAB results in retaining something like the
2067 // original allocation order after promotion, which improves mutator
2068 // locality. A minor effect may be that larger PLABs reduce the
2069 // number of PLAB allocation events during gc. The value of 8kw
2070 // was arrived at by experimenting with specjbb.
2071 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words
2072 return JNI_EINVAL;
2073 }
2074
2075 // Enable parallel GC and adaptive generation sizing
2076 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) {
2077 return JNI_EINVAL;
2078 }
2079 FLAG_SET_DEFAULT(ParallelGCThreads,
2080 Abstract_VM_Version::parallel_worker_threads());
2081
2082 // Encourage steady state memory management
2083 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) {
2084 return JNI_EINVAL;
2085 }
2086
2087 // This appears to improve mutator locality
2088 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2089 return JNI_EINVAL;
2090 }
2091
2092 // Get around early Solaris scheduling bug
2093 // (affinity vs other jobs on system)
2094 // but disallow DR and offlining (5008695).
2095 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) {
2096 return JNI_EINVAL;
2097 }
2098
2099 return JNI_OK;
2100 }
2101
2102 // Set up runtime image flags
2103 void Arguments::set_runtime_image_flags() {
2104 #ifdef _LP64
2105 // Memory map image file by default on 64 bit machines.
2106 if (FLAG_IS_DEFAULT(MemoryMapImage)) {
2107 FLAG_SET_ERGO(bool, MemoryMapImage, true);
2108 }
2109 #endif
2110 }
2111
2112 // This must be called after ergonomics.
2113 void Arguments::set_bytecode_flags() {
2114 if (!RewriteBytecodes) {
2115 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
2116 }
2117 }
2118
2119 // Aggressive optimization flags -XX:+AggressiveOpts
2120 void Arguments::set_aggressive_opts_flags() {
2121 #ifdef COMPILER2
2122 if (AggressiveUnboxing) {
2123 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2124 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2125 } else if (!EliminateAutoBox) {
2126 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
2127 AggressiveUnboxing = false;
2128 }
2129 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
2130 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
2131 } else if (!DoEscapeAnalysis) {
2132 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
2133 AggressiveUnboxing = false;
2134 }
2135 }
2136 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2137 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
2138 FLAG_SET_DEFAULT(EliminateAutoBox, true);
2139 }
2140 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
2141 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
2142 }
2143
2144 // Feed the cache size setting into the JDK
2145 char buffer[1024];
2146 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
2147 add_property(buffer);
2148 }
2149 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
2150 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
2151 }
2152 #endif
2153
2154 if (AggressiveOpts) {
2155 // Sample flag setting code
2156 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
2157 // FLAG_SET_DEFAULT(EliminateZeroing, true);
2158 // }
2159 }
2160 }
2161
2162 //===========================================================================================================
2163 // Parsing of java.compiler property
2164
2165 void Arguments::process_java_compiler_argument(char* arg) {
2166 // For backwards compatibility, Djava.compiler=NONE or ""
2167 // causes us to switch to -Xint mode UNLESS -Xdebug
2168 // is also specified.
2169 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
2170 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
2171 }
2172 }
2173
2174 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
2175 _sun_java_launcher = os::strdup_check_oom(launcher);
2176 }
2177
2178 bool Arguments::created_by_java_launcher() {
2179 assert(_sun_java_launcher != NULL, "property must have value");
2180 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
2181 }
2182
2183 bool Arguments::sun_java_launcher_is_altjvm() {
2184 return _sun_java_launcher_is_altjvm;
2185 }
2186
2187 //===========================================================================================================
2188 // Parsing of main arguments
2189
2190 // check if do gclog rotation
2191 // +UseGCLogFileRotation is a must,
2192 // no gc log rotation when log file not supplied or
2193 // NumberOfGCLogFiles is 0
2194 void check_gclog_consistency() {
2195 if (UseGCLogFileRotation) {
2196 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) {
2197 jio_fprintf(defaultStream::output_stream(),
2198 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n"
2199 "where num_of_file > 0\n"
2200 "GC log rotation is turned off\n");
2201 UseGCLogFileRotation = false;
2202 }
2203 }
2204
2205 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) {
2206 if (FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K) == Flag::SUCCESS) {
2207 jio_fprintf(defaultStream::output_stream(),
2208 "GCLogFileSize changed to minimum 8K\n");
2209 }
2210 }
2211 }
2212
2213 // This function is called for -Xloggc:<filename>, it can be used
2214 // to check if a given file name(or string) conforms to the following
2215 // specification:
2216 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]"
2217 // %p and %t only allowed once. We only limit usage of filename not path
2218 bool is_filename_valid(const char *file_name) {
2219 const char* p = file_name;
2220 char file_sep = os::file_separator()[0];
2221 const char* cp;
2222 // skip prefix path
2223 for (cp = file_name; *cp != '\0'; cp++) {
2224 if (*cp == '/' || *cp == file_sep) {
2225 p = cp + 1;
2226 }
2227 }
2228
2229 int count_p = 0;
2230 int count_t = 0;
2231 while (*p != '\0') {
2232 if ((*p >= '0' && *p <= '9') ||
2233 (*p >= 'A' && *p <= 'Z') ||
2234 (*p >= 'a' && *p <= 'z') ||
2235 *p == '-' ||
2236 *p == '_' ||
2237 *p == '.') {
2238 p++;
2239 continue;
2240 }
2241 if (*p == '%') {
2242 if(*(p + 1) == 'p') {
2243 p += 2;
2244 count_p ++;
2245 continue;
2246 }
2247 if (*(p + 1) == 't') {
2248 p += 2;
2249 count_t ++;
2250 continue;
2251 }
2252 }
2253 return false;
2254 }
2255 return count_p < 2 && count_t < 2;
2256 }
2257
2258 // Check consistency of GC selection
2259 bool Arguments::check_gc_consistency() {
2260 check_gclog_consistency();
2261 // Ensure that the user has not selected conflicting sets
2262 // of collectors.
2263 uint i = 0;
2264 if (UseSerialGC) i++;
2265 if (UseConcMarkSweepGC) i++;
2266 if (UseParallelGC || UseParallelOldGC) i++;
2267 if (UseG1GC) i++;
2268 if (i > 1) {
2269 jio_fprintf(defaultStream::error_stream(),
2270 "Conflicting collector combinations in option list; "
2271 "please refer to the release notes for the combinations "
2272 "allowed\n");
2273 return false;
2274 }
2275
2276 if (UseConcMarkSweepGC && !UseParNewGC) {
2277 jio_fprintf(defaultStream::error_stream(),
2278 "It is not possible to combine the DefNew young collector with the CMS collector.\n");
2279 return false;
2280 }
2281
2282 if (UseParNewGC && !UseConcMarkSweepGC) {
2283 jio_fprintf(defaultStream::error_stream(),
2284 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n");
2285 return false;
2286 }
2287
2288 return true;
2289 }
2290
2291 // Check the consistency of vm_init_args
2292 bool Arguments::check_vm_args_consistency() {
2293 // Method for adding checks for flag consistency.
2294 // The intent is to warn the user of all possible conflicts,
2295 // before returning an error.
2296 // Note: Needs platform-dependent factoring.
2297 bool status = true;
2298
2299 if (TLABRefillWasteFraction == 0) {
2300 jio_fprintf(defaultStream::error_stream(),
2301 "TLABRefillWasteFraction should be a denominator, "
2302 "not " SIZE_FORMAT "\n",
2303 TLABRefillWasteFraction);
2304 status = false;
2305 }
2306
2307 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2308 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2309 }
2310
2311 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2312 // Settings to encourage splitting.
2313 if (!FLAG_IS_CMDLINE(NewRatio)) {
2314 if (FLAG_SET_CMDLINE(uintx, NewRatio, 2) != Flag::SUCCESS) {
2315 status = false;
2316 }
2317 }
2318 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2319 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
2320 status = false;
2321 }
2322 }
2323 }
2324
2325 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) {
2326 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false);
2327 }
2328
2329 if (GCTimeLimit == 100) {
2330 // Turn off gc-overhead-limit-exceeded checks
2331 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2332 }
2333
2334 status = status && check_gc_consistency();
2335
2336 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2337 // insists that we hold the requisite locks so that the iteration is
2338 // MT-safe. For the verification at start-up and shut-down, we don't
2339 // yet have a good way of acquiring and releasing these locks,
2340 // which are not visible at the CollectedHeap level. We want to
2341 // be able to acquire these locks and then do the iteration rather
2342 // than just disable the lock verification. This will be fixed under
2343 // bug 4788986.
2344 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2345 if (VerifyDuringStartup) {
2346 warning("Heap verification at start-up disabled "
2347 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2348 VerifyDuringStartup = false; // Disable verification at start-up
2349 }
2350
2351 if (VerifyBeforeExit) {
2352 warning("Heap verification at shutdown disabled "
2353 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2354 VerifyBeforeExit = false; // Disable verification at shutdown
2355 }
2356 }
2357
2358 // Note: only executed in non-PRODUCT mode
2359 if (!UseAsyncConcMarkSweepGC &&
2360 (ExplicitGCInvokesConcurrent ||
2361 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2362 jio_fprintf(defaultStream::error_stream(),
2363 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2364 " with -UseAsyncConcMarkSweepGC");
2365 status = false;
2366 }
2367
2368 if (PrintNMTStatistics) {
2369 #if INCLUDE_NMT
2370 if (MemTracker::tracking_level() == NMT_off) {
2371 #endif // INCLUDE_NMT
2372 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2373 PrintNMTStatistics = false;
2374 #if INCLUDE_NMT
2375 }
2376 #endif
2377 }
2378
2379 // Check lower bounds of the code cache
2380 // Template Interpreter code is approximately 3X larger in debug builds.
2381 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
2382 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2383 jio_fprintf(defaultStream::error_stream(),
2384 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2385 os::vm_page_size()/K);
2386 status = false;
2387 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2388 jio_fprintf(defaultStream::error_stream(),
2389 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2390 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2391 status = false;
2392 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2393 jio_fprintf(defaultStream::error_stream(),
2394 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2395 min_code_cache_size/K);
2396 status = false;
2397 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) {
2398 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported.
2399 jio_fprintf(defaultStream::error_stream(),
2400 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2401 CODE_CACHE_SIZE_LIMIT/M);
2402 status = false;
2403 } else if (NonNMethodCodeHeapSize < min_code_cache_size){
2404 jio_fprintf(defaultStream::error_stream(),
2405 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K,
2406 min_code_cache_size/K);
2407 status = false;
2408 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize))
2409 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) {
2410 jio_fprintf(defaultStream::error_stream(),
2411 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n",
2412 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K,
2413 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K);
2414 status = false;
2415 }
2416
2417 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) {
2418 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount.");
2419 }
2420
2421 return status;
2422 }
2423
2424 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2425 const char* option_type) {
2426 if (ignore) return false;
2427
2428 const char* spacer = " ";
2429 if (option_type == NULL) {
2430 option_type = ++spacer; // Set both to the empty string.
2431 }
2432
2433 if (os::obsolete_option(option)) {
2434 jio_fprintf(defaultStream::error_stream(),
2435 "Obsolete %s%soption: %s\n", option_type, spacer,
2436 option->optionString);
2437 return false;
2438 } else {
2439 jio_fprintf(defaultStream::error_stream(),
2440 "Unrecognized %s%soption: %s\n", option_type, spacer,
2441 option->optionString);
2442 return true;
2443 }
2444 }
2445
2446 static const char* user_assertion_options[] = {
2447 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2448 };
2449
2450 static const char* system_assertion_options[] = {
2451 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2452 };
2453
2454 bool Arguments::parse_uintx(const char* value,
2455 uintx* uintx_arg,
2456 uintx min_size) {
2457
2458 // Check the sign first since atomull() parses only unsigned values.
2459 bool value_is_positive = !(*value == '-');
2460
2461 if (value_is_positive) {
2462 julong n;
2463 bool good_return = atomull(value, &n);
2464 if (good_return) {
2465 bool above_minimum = n >= min_size;
2466 bool value_is_too_large = n > max_uintx;
2467
2468 if (above_minimum && !value_is_too_large) {
2469 *uintx_arg = n;
2470 return true;
2471 }
2472 }
2473 }
2474 return false;
2475 }
2476
2477 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2478 julong* long_arg,
2479 julong min_size) {
2480 if (!atomull(s, long_arg)) return arg_unreadable;
2481 return check_memory_size(*long_arg, min_size);
2482 }
2483
2484 // Parse JavaVMInitArgs structure
2485
2486 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args,
2487 const JavaVMInitArgs *java_options_args,
2488 const JavaVMInitArgs *cmd_line_args) {
2489 // For components of the system classpath.
2490 SysClassPath scp(Arguments::get_sysclasspath());
2491 bool scp_assembly_required = false;
2492
2493 // Save default settings for some mode flags
2494 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2495 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2496 Arguments::_ClipInlining = ClipInlining;
2497 Arguments::_BackgroundCompilation = BackgroundCompilation;
2498 if (TieredCompilation) {
2499 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog;
2500 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold;
2501 }
2502
2503 // Setup flags for mixed which is the default
2504 set_mode_flags(_mixed);
2505
2506 // Parse args structure generated from JAVA_TOOL_OPTIONS environment
2507 // variable (if present).
2508 jint result = parse_each_vm_init_arg(
2509 java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2510 if (result != JNI_OK) {
2511 return result;
2512 }
2513
2514 // Parse args structure generated from the command line flags.
2515 result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required,
2516 Flag::COMMAND_LINE);
2517 if (result != JNI_OK) {
2518 return result;
2519 }
2520
2521 // Parse args structure generated from the _JAVA_OPTIONS environment
2522 // variable (if present) (mimics classic VM)
2523 result = parse_each_vm_init_arg(
2524 java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR);
2525 if (result != JNI_OK) {
2526 return result;
2527 }
2528
2529 // Do final processing now that all arguments have been parsed
2530 result = finalize_vm_init_args(&scp, scp_assembly_required);
2531 if (result != JNI_OK) {
2532 return result;
2533 }
2534
2535 return JNI_OK;
2536 }
2537
2538 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2539 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2540 // are dealing with -agentpath (case where name is a path), otherwise with
2541 // -agentlib
2542 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2543 char *_name;
2544 const char *_hprof = "hprof", *_jdwp = "jdwp";
2545 size_t _len_hprof, _len_jdwp, _len_prefix;
2546
2547 if (is_path) {
2548 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2549 return false;
2550 }
2551
2552 _name++; // skip past last path separator
2553 _len_prefix = strlen(JNI_LIB_PREFIX);
2554
2555 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2556 return false;
2557 }
2558
2559 _name += _len_prefix;
2560 _len_hprof = strlen(_hprof);
2561 _len_jdwp = strlen(_jdwp);
2562
2563 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2564 _name += _len_hprof;
2565 }
2566 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2567 _name += _len_jdwp;
2568 }
2569 else {
2570 return false;
2571 }
2572
2573 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2574 return false;
2575 }
2576
2577 return true;
2578 }
2579
2580 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2581 return true;
2582 }
2583
2584 return false;
2585 }
2586
2587 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2588 SysClassPath* scp_p,
2589 bool* scp_assembly_required_p,
2590 Flag::Flags origin) {
2591 // Remaining part of option string
2592 const char* tail;
2593
2594 // iterate over arguments
2595 for (int index = 0; index < args->nOptions; index++) {
2596 bool is_absolute_path = false; // for -agentpath vs -agentlib
2597
2598 const JavaVMOption* option = args->options + index;
2599
2600 if (!match_option(option, "-Djava.class.path", &tail) &&
2601 !match_option(option, "-Dsun.java.command", &tail) &&
2602 !match_option(option, "-Dsun.java.launcher", &tail)) {
2603
2604 // add all jvm options to the jvm_args string. This string
2605 // is used later to set the java.vm.args PerfData string constant.
2606 // the -Djava.class.path and the -Dsun.java.command options are
2607 // omitted from jvm_args string as each have their own PerfData
2608 // string constant object.
2609 build_jvm_args(option->optionString);
2610 }
2611
2612 // -verbose:[class/gc/jni]
2613 if (match_option(option, "-verbose", &tail)) {
2614 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2615 if (FLAG_SET_CMDLINE(bool, TraceClassLoading, true) != Flag::SUCCESS) {
2616 return JNI_EINVAL;
2617 }
2618 if (FLAG_SET_CMDLINE(bool, TraceClassUnloading, true) != Flag::SUCCESS) {
2619 return JNI_EINVAL;
2620 }
2621 } else if (!strcmp(tail, ":gc")) {
2622 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
2623 return JNI_EINVAL;
2624 }
2625 } else if (!strcmp(tail, ":jni")) {
2626 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) {
2627 return JNI_EINVAL;
2628 }
2629 }
2630 // -da / -ea / -disableassertions / -enableassertions
2631 // These accept an optional class/package name separated by a colon, e.g.,
2632 // -da:java.lang.Thread.
2633 } else if (match_option(option, user_assertion_options, &tail, true)) {
2634 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2635 if (*tail == '\0') {
2636 JavaAssertions::setUserClassDefault(enable);
2637 } else {
2638 assert(*tail == ':', "bogus match by match_option()");
2639 JavaAssertions::addOption(tail + 1, enable);
2640 }
2641 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2642 } else if (match_option(option, system_assertion_options, &tail, false)) {
2643 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2644 JavaAssertions::setSystemClassDefault(enable);
2645 // -bootclasspath:
2646 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2647 scp_p->reset_path(tail);
2648 *scp_assembly_required_p = true;
2649 // -bootclasspath/a:
2650 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2651 scp_p->add_suffix(tail);
2652 *scp_assembly_required_p = true;
2653 // -bootclasspath/p:
2654 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2655 scp_p->add_prefix(tail);
2656 *scp_assembly_required_p = true;
2657 // -Xrun
2658 } else if (match_option(option, "-Xrun", &tail)) {
2659 if (tail != NULL) {
2660 const char* pos = strchr(tail, ':');
2661 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2662 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2663 name[len] = '\0';
2664
2665 char *options = NULL;
2666 if(pos != NULL) {
2667 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2668 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2669 }
2670 #if !INCLUDE_JVMTI
2671 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2672 jio_fprintf(defaultStream::error_stream(),
2673 "Profiling and debugging agents are not supported in this VM\n");
2674 return JNI_ERR;
2675 }
2676 #endif // !INCLUDE_JVMTI
2677 add_init_library(name, options);
2678 }
2679 // -agentlib and -agentpath
2680 } else if (match_option(option, "-agentlib:", &tail) ||
2681 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2682 if(tail != NULL) {
2683 const char* pos = strchr(tail, '=');
2684 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2685 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2686 name[len] = '\0';
2687
2688 char *options = NULL;
2689 if(pos != NULL) {
2690 options = os::strdup_check_oom(pos + 1, mtInternal);
2691 }
2692 #if !INCLUDE_JVMTI
2693 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2694 jio_fprintf(defaultStream::error_stream(),
2695 "Profiling and debugging agents are not supported in this VM\n");
2696 return JNI_ERR;
2697 }
2698 #endif // !INCLUDE_JVMTI
2699 add_init_agent(name, options, is_absolute_path);
2700 }
2701 // -javaagent
2702 } else if (match_option(option, "-javaagent:", &tail)) {
2703 #if !INCLUDE_JVMTI
2704 jio_fprintf(defaultStream::error_stream(),
2705 "Instrumentation agents are not supported in this VM\n");
2706 return JNI_ERR;
2707 #else
2708 if(tail != NULL) {
2709 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2710 add_init_agent("instrument", options, false);
2711 }
2712 #endif // !INCLUDE_JVMTI
2713 // -Xnoclassgc
2714 } else if (match_option(option, "-Xnoclassgc")) {
2715 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) {
2716 return JNI_EINVAL;
2717 }
2718 // -Xconcgc
2719 } else if (match_option(option, "-Xconcgc")) {
2720 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) {
2721 return JNI_EINVAL;
2722 }
2723 // -Xnoconcgc
2724 } else if (match_option(option, "-Xnoconcgc")) {
2725 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) {
2726 return JNI_EINVAL;
2727 }
2728 // -Xbatch
2729 } else if (match_option(option, "-Xbatch")) {
2730 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2731 return JNI_EINVAL;
2732 }
2733 // -Xmn for compatibility with other JVM vendors
2734 } else if (match_option(option, "-Xmn", &tail)) {
2735 julong long_initial_young_size = 0;
2736 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1);
2737 if (errcode != arg_in_range) {
2738 jio_fprintf(defaultStream::error_stream(),
2739 "Invalid initial young generation size: %s\n", option->optionString);
2740 describe_range_error(errcode);
2741 return JNI_EINVAL;
2742 }
2743 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2744 return JNI_EINVAL;
2745 }
2746 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) {
2747 return JNI_EINVAL;
2748 }
2749 // -Xms
2750 } else if (match_option(option, "-Xms", &tail)) {
2751 julong long_initial_heap_size = 0;
2752 // an initial heap size of 0 means automatically determine
2753 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2754 if (errcode != arg_in_range) {
2755 jio_fprintf(defaultStream::error_stream(),
2756 "Invalid initial heap size: %s\n", option->optionString);
2757 describe_range_error(errcode);
2758 return JNI_EINVAL;
2759 }
2760 set_min_heap_size((size_t)long_initial_heap_size);
2761 // Currently the minimum size and the initial heap sizes are the same.
2762 // Can be overridden with -XX:InitialHeapSize.
2763 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) {
2764 return JNI_EINVAL;
2765 }
2766 // -Xmx
2767 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2768 julong long_max_heap_size = 0;
2769 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2770 if (errcode != arg_in_range) {
2771 jio_fprintf(defaultStream::error_stream(),
2772 "Invalid maximum heap size: %s\n", option->optionString);
2773 describe_range_error(errcode);
2774 return JNI_EINVAL;
2775 }
2776 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) {
2777 return JNI_EINVAL;
2778 }
2779 // Xmaxf
2780 } else if (match_option(option, "-Xmaxf", &tail)) {
2781 char* err;
2782 int maxf = (int)(strtod(tail, &err) * 100);
2783 if (*err != '\0' || *tail == '\0') {
2784 jio_fprintf(defaultStream::error_stream(),
2785 "Bad max heap free percentage size: %s\n",
2786 option->optionString);
2787 return JNI_EINVAL;
2788 } else {
2789 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) {
2790 return JNI_EINVAL;
2791 }
2792 }
2793 // Xminf
2794 } else if (match_option(option, "-Xminf", &tail)) {
2795 char* err;
2796 int minf = (int)(strtod(tail, &err) * 100);
2797 if (*err != '\0' || *tail == '\0') {
2798 jio_fprintf(defaultStream::error_stream(),
2799 "Bad min heap free percentage size: %s\n",
2800 option->optionString);
2801 return JNI_EINVAL;
2802 } else {
2803 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) {
2804 return JNI_EINVAL;
2805 }
2806 }
2807 // -Xss
2808 } else if (match_option(option, "-Xss", &tail)) {
2809 julong long_ThreadStackSize = 0;
2810 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2811 if (errcode != arg_in_range) {
2812 jio_fprintf(defaultStream::error_stream(),
2813 "Invalid thread stack size: %s\n", option->optionString);
2814 describe_range_error(errcode);
2815 return JNI_EINVAL;
2816 }
2817 // Internally track ThreadStackSize in units of 1024 bytes.
2818 if (FLAG_SET_CMDLINE(intx, ThreadStackSize,
2819 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) {
2820 return JNI_EINVAL;
2821 }
2822 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads
2823 } else if (match_option(option, "-Xoss", &tail) ||
2824 match_option(option, "-Xsqnopause") ||
2825 match_option(option, "-Xoptimize") ||
2826 match_option(option, "-Xboundthreads")) {
2827 // All these options are deprecated in JDK 9 and will be removed in a future release
2828 char version[256];
2829 JDK_Version::jdk(9).to_string(version, sizeof(version));
2830 warning("Ignoring option %s; support was removed in %s", option->optionString, version);
2831 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2832 julong long_CodeCacheExpansionSize = 0;
2833 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2834 if (errcode != arg_in_range) {
2835 jio_fprintf(defaultStream::error_stream(),
2836 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2837 os::vm_page_size()/K);
2838 return JNI_EINVAL;
2839 }
2840 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) {
2841 return JNI_EINVAL;
2842 }
2843 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2844 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2845 julong long_ReservedCodeCacheSize = 0;
2846
2847 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2848 if (errcode != arg_in_range) {
2849 jio_fprintf(defaultStream::error_stream(),
2850 "Invalid maximum code cache size: %s.\n", option->optionString);
2851 return JNI_EINVAL;
2852 }
2853 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) {
2854 return JNI_EINVAL;
2855 }
2856 // -XX:NonNMethodCodeHeapSize=
2857 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) {
2858 julong long_NonNMethodCodeHeapSize = 0;
2859
2860 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1);
2861 if (errcode != arg_in_range) {
2862 jio_fprintf(defaultStream::error_stream(),
2863 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString);
2864 return JNI_EINVAL;
2865 }
2866 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) {
2867 return JNI_EINVAL;
2868 }
2869 // -XX:ProfiledCodeHeapSize=
2870 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) {
2871 julong long_ProfiledCodeHeapSize = 0;
2872
2873 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1);
2874 if (errcode != arg_in_range) {
2875 jio_fprintf(defaultStream::error_stream(),
2876 "Invalid maximum profiled code heap size: %s.\n", option->optionString);
2877 return JNI_EINVAL;
2878 }
2879 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) {
2880 return JNI_EINVAL;
2881 }
2882 // -XX:NonProfiledCodeHeapSizee=
2883 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) {
2884 julong long_NonProfiledCodeHeapSize = 0;
2885
2886 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1);
2887 if (errcode != arg_in_range) {
2888 jio_fprintf(defaultStream::error_stream(),
2889 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString);
2890 return JNI_EINVAL;
2891 }
2892 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) {
2893 return JNI_EINVAL;
2894 }
2895 // -green
2896 } else if (match_option(option, "-green")) {
2897 jio_fprintf(defaultStream::error_stream(),
2898 "Green threads support not available\n");
2899 return JNI_EINVAL;
2900 // -native
2901 } else if (match_option(option, "-native")) {
2902 // HotSpot always uses native threads, ignore silently for compatibility
2903 // -Xrs
2904 } else if (match_option(option, "-Xrs")) {
2905 // Classic/EVM option, new functionality
2906 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) {
2907 return JNI_EINVAL;
2908 }
2909 } else if (match_option(option, "-Xusealtsigs")) {
2910 // change default internal VM signals used - lower case for back compat
2911 if (FLAG_SET_CMDLINE(bool, UseAltSigs, true) != Flag::SUCCESS) {
2912 return JNI_EINVAL;
2913 }
2914 // -Xprof
2915 } else if (match_option(option, "-Xprof")) {
2916 #if INCLUDE_FPROF
2917 _has_profile = true;
2918 #else // INCLUDE_FPROF
2919 jio_fprintf(defaultStream::error_stream(),
2920 "Flat profiling is not supported in this VM.\n");
2921 return JNI_ERR;
2922 #endif // INCLUDE_FPROF
2923 // -Xconcurrentio
2924 } else if (match_option(option, "-Xconcurrentio")) {
2925 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) {
2926 return JNI_EINVAL;
2927 }
2928 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) {
2929 return JNI_EINVAL;
2930 }
2931 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) {
2932 return JNI_EINVAL;
2933 }
2934 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) {
2935 return JNI_EINVAL;
2936 }
2937 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation
2938 return JNI_EINVAL;
2939 }
2940
2941 // -Xinternalversion
2942 } else if (match_option(option, "-Xinternalversion")) {
2943 jio_fprintf(defaultStream::output_stream(), "%s\n",
2944 VM_Version::internal_vm_info_string());
2945 vm_exit(0);
2946 #ifndef PRODUCT
2947 // -Xprintflags
2948 } else if (match_option(option, "-Xprintflags")) {
2949 CommandLineFlags::printFlags(tty, false);
2950 vm_exit(0);
2951 #endif
2952 // -D
2953 } else if (match_option(option, "-D", &tail)) {
2954 const char* value;
2955 if (match_option(option, "-Djava.endorsed.dirs=", &value) &&
2956 *value!= '\0' && strcmp(value, "\"\"") != 0) {
2957 // abort if -Djava.endorsed.dirs is set
2958 jio_fprintf(defaultStream::output_stream(),
2959 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n"
2960 "in modular form will be supported via the concept of upgradeable modules.\n", value);
2961 return JNI_EINVAL;
2962 }
2963 if (match_option(option, "-Djava.ext.dirs=", &value) &&
2964 *value != '\0' && strcmp(value, "\"\"") != 0) {
2965 // abort if -Djava.ext.dirs is set
2966 jio_fprintf(defaultStream::output_stream(),
2967 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value);
2968 return JNI_EINVAL;
2969 }
2970
2971 if (!add_property(tail)) {
2972 return JNI_ENOMEM;
2973 }
2974 // Out of the box management support
2975 if (match_option(option, "-Dcom.sun.management", &tail)) {
2976 #if INCLUDE_MANAGEMENT
2977 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) {
2978 return JNI_EINVAL;
2979 }
2980 #else
2981 jio_fprintf(defaultStream::output_stream(),
2982 "-Dcom.sun.management is not supported in this VM.\n");
2983 return JNI_ERR;
2984 #endif
2985 }
2986 // -Xint
2987 } else if (match_option(option, "-Xint")) {
2988 set_mode_flags(_int);
2989 // -Xmixed
2990 } else if (match_option(option, "-Xmixed")) {
2991 set_mode_flags(_mixed);
2992 // -Xcomp
2993 } else if (match_option(option, "-Xcomp")) {
2994 // for testing the compiler; turn off all flags that inhibit compilation
2995 set_mode_flags(_comp);
2996 // -Xshare:dump
2997 } else if (match_option(option, "-Xshare:dump")) {
2998 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) {
2999 return JNI_EINVAL;
3000 }
3001 set_mode_flags(_int); // Prevent compilation, which creates objects
3002 // -Xshare:on
3003 } else if (match_option(option, "-Xshare:on")) {
3004 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3005 return JNI_EINVAL;
3006 }
3007 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3008 return JNI_EINVAL;
3009 }
3010 // -Xshare:auto
3011 } else if (match_option(option, "-Xshare:auto")) {
3012 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3013 return JNI_EINVAL;
3014 }
3015 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3016 return JNI_EINVAL;
3017 }
3018 // -Xshare:off
3019 } else if (match_option(option, "-Xshare:off")) {
3020 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) {
3021 return JNI_EINVAL;
3022 }
3023 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) {
3024 return JNI_EINVAL;
3025 }
3026 // -Xverify
3027 } else if (match_option(option, "-Xverify", &tail)) {
3028 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
3029 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) {
3030 return JNI_EINVAL;
3031 }
3032 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3033 return JNI_EINVAL;
3034 }
3035 } else if (strcmp(tail, ":remote") == 0) {
3036 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3037 return JNI_EINVAL;
3038 }
3039 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) {
3040 return JNI_EINVAL;
3041 }
3042 } else if (strcmp(tail, ":none") == 0) {
3043 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) {
3044 return JNI_EINVAL;
3045 }
3046 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) {
3047 return JNI_EINVAL;
3048 }
3049 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
3050 return JNI_EINVAL;
3051 }
3052 // -Xdebug
3053 } else if (match_option(option, "-Xdebug")) {
3054 // note this flag has been used, then ignore
3055 set_xdebug_mode(true);
3056 // -Xnoagent
3057 } else if (match_option(option, "-Xnoagent")) {
3058 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
3059 } else if (match_option(option, "-Xloggc:", &tail)) {
3060 // Redirect GC output to the file. -Xloggc:<filename>
3061 // ostream_init_log(), when called will use this filename
3062 // to initialize a fileStream.
3063 _gc_log_filename = os::strdup_check_oom(tail);
3064 if (!is_filename_valid(_gc_log_filename)) {
3065 jio_fprintf(defaultStream::output_stream(),
3066 "Invalid file name for use with -Xloggc: Filename can only contain the "
3067 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n"
3068 "Note %%p or %%t can only be used once\n", _gc_log_filename);
3069 return JNI_EINVAL;
3070 }
3071 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) {
3072 return JNI_EINVAL;
3073 }
3074 if (FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true) != Flag::SUCCESS) {
3075 return JNI_EINVAL;
3076 }
3077 // JNI hooks
3078 } else if (match_option(option, "-Xcheck", &tail)) {
3079 if (!strcmp(tail, ":jni")) {
3080 #if !INCLUDE_JNI_CHECK
3081 warning("JNI CHECKING is not supported in this VM");
3082 #else
3083 CheckJNICalls = true;
3084 #endif // INCLUDE_JNI_CHECK
3085 } else if (is_bad_option(option, args->ignoreUnrecognized,
3086 "check")) {
3087 return JNI_EINVAL;
3088 }
3089 } else if (match_option(option, "vfprintf")) {
3090 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
3091 } else if (match_option(option, "exit")) {
3092 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
3093 } else if (match_option(option, "abort")) {
3094 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
3095 // -XX:+AggressiveHeap
3096 } else if (match_option(option, "-XX:+AggressiveHeap")) {
3097 jint result = set_aggressive_heap_flags();
3098 if (result != JNI_OK) {
3099 return result;
3100 }
3101 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure;
3102 // and the last option wins.
3103 } else if (match_option(option, "-XX:+NeverTenure")) {
3104 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) {
3105 return JNI_EINVAL;
3106 }
3107 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3108 return JNI_EINVAL;
3109 }
3110 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) {
3111 return JNI_EINVAL;
3112 }
3113 } else if (match_option(option, "-XX:+AlwaysTenure")) {
3114 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3115 return JNI_EINVAL;
3116 }
3117 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3118 return JNI_EINVAL;
3119 }
3120 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) {
3121 return JNI_EINVAL;
3122 }
3123 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) {
3124 uintx max_tenuring_thresh = 0;
3125 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) {
3126 jio_fprintf(defaultStream::error_stream(),
3127 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail);
3128 return JNI_EINVAL;
3129 }
3130
3131 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) {
3132 return JNI_EINVAL;
3133 }
3134
3135 if (MaxTenuringThreshold == 0) {
3136 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3137 return JNI_EINVAL;
3138 }
3139 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) {
3140 return JNI_EINVAL;
3141 }
3142 } else {
3143 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) {
3144 return JNI_EINVAL;
3145 }
3146 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) {
3147 return JNI_EINVAL;
3148 }
3149 }
3150 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) {
3151 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) {
3152 return JNI_EINVAL;
3153 }
3154 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) {
3155 return JNI_EINVAL;
3156 }
3157 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) {
3158 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) {
3159 return JNI_EINVAL;
3160 }
3161 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) {
3162 return JNI_EINVAL;
3163 }
3164 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) {
3165 #if defined(DTRACE_ENABLED)
3166 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) {
3167 return JNI_EINVAL;
3168 }
3169 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) {
3170 return JNI_EINVAL;
3171 }
3172 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) {
3173 return JNI_EINVAL;
3174 }
3175 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) {
3176 return JNI_EINVAL;
3177 }
3178 #else // defined(DTRACE_ENABLED)
3179 jio_fprintf(defaultStream::error_stream(),
3180 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3181 return JNI_EINVAL;
3182 #endif // defined(DTRACE_ENABLED)
3183 #ifdef ASSERT
3184 } else if (match_option(option, "-XX:+FullGCALot")) {
3185 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) {
3186 return JNI_EINVAL;
3187 }
3188 // disable scavenge before parallel mark-compact
3189 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) {
3190 return JNI_EINVAL;
3191 }
3192 #endif
3193 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3194 julong max_direct_memory_size = 0;
3195 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3196 if (errcode != arg_in_range) {
3197 jio_fprintf(defaultStream::error_stream(),
3198 "Invalid maximum direct memory size: %s\n",
3199 option->optionString);
3200 describe_range_error(errcode);
3201 return JNI_EINVAL;
3202 }
3203 if (FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size) != Flag::SUCCESS) {
3204 return JNI_EINVAL;
3205 }
3206 #if !INCLUDE_MANAGEMENT
3207 } else if (match_option(option, "-XX:+ManagementServer")) {
3208 jio_fprintf(defaultStream::error_stream(),
3209 "ManagementServer is not supported in this VM.\n");
3210 return JNI_ERR;
3211 #endif // INCLUDE_MANAGEMENT
3212 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3213 // Skip -XX:Flags= since that case has already been handled
3214 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3215 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3216 return JNI_EINVAL;
3217 }
3218 }
3219 // Unknown option
3220 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3221 return JNI_ERR;
3222 }
3223 }
3224
3225 // PrintSharedArchiveAndExit will turn on
3226 // -Xshare:on
3227 // -XX:+TraceClassPaths
3228 if (PrintSharedArchiveAndExit) {
3229 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) {
3230 return JNI_EINVAL;
3231 }
3232 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) {
3233 return JNI_EINVAL;
3234 }
3235 if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) {
3236 return JNI_EINVAL;
3237 }
3238 }
3239
3240 // Change the default value for flags which have different default values
3241 // when working with older JDKs.
3242 #ifdef LINUX
3243 if (JDK_Version::current().compare_major(6) <= 0 &&
3244 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3245 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3246 }
3247 #endif // LINUX
3248 fix_appclasspath();
3249 return JNI_OK;
3250 }
3251
3252 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled)
3253 //
3254 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar
3255 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar".
3256 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty
3257 // path is treated as the current directory.
3258 //
3259 // This causes problems with CDS, which requires that all directories specified in the classpath
3260 // must be empty. In most cases, applications do NOT want to load classes from the current
3261 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up
3262 // scripts compatible with CDS.
3263 void Arguments::fix_appclasspath() {
3264 if (IgnoreEmptyClassPaths) {
3265 const char separator = *os::path_separator();
3266 const char* src = _java_class_path->value();
3267
3268 // skip over all the leading empty paths
3269 while (*src == separator) {
3270 src ++;
3271 }
3272
3273 char* copy = os::strdup_check_oom(src, mtInternal);
3274
3275 // trim all trailing empty paths
3276 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) {
3277 *tail = '\0';
3278 }
3279
3280 char from[3] = {separator, separator, '\0'};
3281 char to [2] = {separator, '\0'};
3282 while (StringUtils::replace_no_expand(copy, from, to) > 0) {
3283 // Keep replacing "::" -> ":" until we have no more "::" (non-windows)
3284 // Keep replacing ";;" -> ";" until we have no more ";;" (windows)
3285 }
3286
3287 _java_class_path->set_value(copy);
3288 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore
3289 }
3290
3291 if (!PrintSharedArchiveAndExit) {
3292 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value());
3293 }
3294 }
3295
3296 static bool has_jar_files(const char* directory) {
3297 DIR* dir = os::opendir(directory);
3298 if (dir == NULL) return false;
3299
3300 struct dirent *entry;
3301 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
3302 bool hasJarFile = false;
3303 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
3304 const char* name = entry->d_name;
3305 const char* ext = name + strlen(name) - 4;
3306 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0);
3307 }
3308 FREE_C_HEAP_ARRAY(char, dbuf);
3309 os::closedir(dir);
3310 return hasJarFile ;
3311 }
3312
3313 static int check_non_empty_dirs(const char* path) {
3314 const char separator = *os::path_separator();
3315 const char* const end = path + strlen(path);
3316 int nonEmptyDirs = 0;
3317 while (path < end) {
3318 const char* tmp_end = strchr(path, separator);
3319 if (tmp_end == NULL) {
3320 if (has_jar_files(path)) {
3321 nonEmptyDirs++;
3322 jio_fprintf(defaultStream::output_stream(),
3323 "Non-empty directory: %s\n", path);
3324 }
3325 path = end;
3326 } else {
3327 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
3328 memcpy(dirpath, path, tmp_end - path);
3329 dirpath[tmp_end - path] = '\0';
3330 if (has_jar_files(dirpath)) {
3331 nonEmptyDirs++;
3332 jio_fprintf(defaultStream::output_stream(),
3333 "Non-empty directory: %s\n", dirpath);
3334 }
3335 FREE_C_HEAP_ARRAY(char, dirpath);
3336 path = tmp_end + 1;
3337 }
3338 }
3339 return nonEmptyDirs;
3340 }
3341
3342 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3343 // check if the default lib/endorsed directory exists; if so, error
3344 char path[JVM_MAXPATHLEN];
3345 const char* fileSep = os::file_separator();
3346 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep);
3347
3348 if (CheckEndorsedAndExtDirs) {
3349 int nonEmptyDirs = 0;
3350 // check endorsed directory
3351 nonEmptyDirs += check_non_empty_dirs(path);
3352 // check the extension directories
3353 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs());
3354 if (nonEmptyDirs > 0) {
3355 return JNI_ERR;
3356 }
3357 }
3358
3359 DIR* dir = os::opendir(path);
3360 if (dir != NULL) {
3361 jio_fprintf(defaultStream::output_stream(),
3362 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n"
3363 "in modular form will be supported via the concept of upgradeable modules.\n");
3364 os::closedir(dir);
3365 return JNI_ERR;
3366 }
3367
3368 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep);
3369 dir = os::opendir(path);
3370 if (dir != NULL) {
3371 jio_fprintf(defaultStream::output_stream(),
3372 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; "
3373 "Use -classpath instead.\n.");
3374 os::closedir(dir);
3375 return JNI_ERR;
3376 }
3377
3378 if (scp_assembly_required) {
3379 // Assemble the bootclasspath elements into the final path.
3380 Arguments::set_sysclasspath(scp_p->combined_path());
3381 }
3382
3383 // This must be done after all arguments have been processed.
3384 // java_compiler() true means set to "NONE" or empty.
3385 if (java_compiler() && !xdebug_mode()) {
3386 // For backwards compatibility, we switch to interpreted mode if
3387 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3388 // not specified.
3389 set_mode_flags(_int);
3390 }
3391
3392 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode),
3393 // but like -Xint, leave compilation thresholds unaffected.
3394 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well.
3395 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) {
3396 set_mode_flags(_int);
3397 }
3398
3399 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3400 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3401 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3402 }
3403
3404 #ifndef COMPILER2
3405 // Don't degrade server performance for footprint
3406 if (FLAG_IS_DEFAULT(UseLargePages) &&
3407 MaxHeapSize < LargePageHeapSizeThreshold) {
3408 // No need for large granularity pages w/small heaps.
3409 // Note that large pages are enabled/disabled for both the
3410 // Java heap and the code cache.
3411 FLAG_SET_DEFAULT(UseLargePages, false);
3412 }
3413
3414 #else
3415 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3416 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3417 }
3418 #endif
3419
3420 #ifndef TIERED
3421 // Tiered compilation is undefined.
3422 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3423 #endif
3424
3425 // If we are running in a headless jre, force java.awt.headless property
3426 // to be true unless the property has already been set.
3427 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3428 if (os::is_headless_jre()) {
3429 const char* headless = Arguments::get_property("java.awt.headless");
3430 if (headless == NULL) {
3431 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS");
3432 if (headless_env == NULL) {
3433 if (!add_property("java.awt.headless=true")) {
3434 return JNI_ENOMEM;
3435 }
3436 } else {
3437 char buffer[256];
3438 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env);
3439 if (!add_property(buffer)) {
3440 return JNI_ENOMEM;
3441 }
3442 }
3443 }
3444 }
3445
3446 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) {
3447 // CMS can only be used with ParNew
3448 FLAG_SET_ERGO(bool, UseParNewGC, true);
3449 }
3450
3451 if (!check_vm_args_consistency()) {
3452 return JNI_ERR;
3453 }
3454
3455 return JNI_OK;
3456 }
3457
3458 // Helper class for controlling the lifetime of JavaVMInitArgs
3459 // objects. The contents of the JavaVMInitArgs are guaranteed to be
3460 // deleted on the destruction of the ScopedVMInitArgs object.
3461 class ScopedVMInitArgs : public StackObj {
3462 private:
3463 JavaVMInitArgs _args;
3464
3465 public:
3466 ScopedVMInitArgs() {
3467 _args.version = JNI_VERSION_1_2;
3468 _args.nOptions = 0;
3469 _args.options = NULL;
3470 _args.ignoreUnrecognized = false;
3471 }
3472
3473 // Populates the JavaVMInitArgs object represented by this
3474 // ScopedVMInitArgs object with the arguments in options. The
3475 // allocated memory is deleted by the destructor. If this method
3476 // returns anything other than JNI_OK, then this object is in a
3477 // partially constructed state, and should be abandoned.
3478 jint set_args(GrowableArray<JavaVMOption>* options) {
3479 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL(
3480 JavaVMOption, options->length(), mtInternal);
3481 if (options_arr == NULL) {
3482 return JNI_ENOMEM;
3483 }
3484 _args.options = options_arr;
3485
3486 for (int i = 0; i < options->length(); i++) {
3487 options_arr[i] = options->at(i);
3488 options_arr[i].optionString = os::strdup(options_arr[i].optionString);
3489 if (options_arr[i].optionString == NULL) {
3490 // Rely on the destructor to do cleanup.
3491 _args.nOptions = i;
3492 return JNI_ENOMEM;
3493 }
3494 }
3495
3496 _args.nOptions = options->length();
3497 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3498 return JNI_OK;
3499 }
3500
3501 JavaVMInitArgs* get() { return &_args; }
3502
3503 ~ScopedVMInitArgs() {
3504 if (_args.options == NULL) return;
3505 for (int i = 0; i < _args.nOptions; i++) {
3506 os::free(_args.options[i].optionString);
3507 }
3508 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options);
3509 }
3510 };
3511
3512 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) {
3513 return parse_options_environment_variable("_JAVA_OPTIONS", args);
3514 }
3515
3516 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) {
3517 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args);
3518 }
3519
3520 jint Arguments::parse_options_environment_variable(const char* name,
3521 ScopedVMInitArgs* vm_args) {
3522 char *buffer = ::getenv(name);
3523
3524 // Don't check this environment variable if user has special privileges
3525 // (e.g. unix su command).
3526 if (buffer == NULL || os::have_special_privileges()) {
3527 return JNI_OK;
3528 }
3529
3530 if ((buffer = os::strdup(buffer)) == NULL) {
3531 return JNI_ENOMEM;
3532 }
3533
3534 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array
3535 jio_fprintf(defaultStream::error_stream(),
3536 "Picked up %s: %s\n", name, buffer);
3537 char* rd = buffer; // pointer to the input string (rd)
3538 while (true) { // repeat for all options in the input string
3539 while (isspace(*rd)) rd++; // skip whitespace
3540 if (*rd == 0) break; // we re done when the input string is read completely
3541
3542 // The output, option string, overwrites the input string.
3543 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3544 // input string (rd).
3545 char* wrt = rd;
3546
3547 JavaVMOption option;
3548 option.optionString = wrt;
3549 options->append(option); // Fill in option
3550 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3551 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3552 int quote = *rd; // matching quote to look for
3553 rd++; // don't copy open quote
3554 while (*rd != quote) { // include everything (even spaces) up until quote
3555 if (*rd == 0) { // string termination means unmatched string
3556 jio_fprintf(defaultStream::error_stream(),
3557 "Unmatched quote in %s\n", name);
3558 delete options;
3559 os::free(buffer);
3560 return JNI_ERR;
3561 }
3562 *wrt++ = *rd++; // copy to option string
3563 }
3564 rd++; // don't copy close quote
3565 } else {
3566 *wrt++ = *rd++; // copy to option string
3567 }
3568 }
3569 if (*rd != 0) {
3570 // In this case, the assignment to wrt below will make *rd nul,
3571 // which will interfere with the next loop iteration.
3572 rd++;
3573 }
3574 *wrt = 0; // Zero terminate option
3575 }
3576
3577 // Fill out JavaVMInitArgs structure.
3578 jint status = vm_args->set_args(options);
3579
3580 delete options;
3581 os::free(buffer);
3582 return status;
3583 }
3584
3585 void Arguments::set_shared_spaces_flags() {
3586 if (DumpSharedSpaces) {
3587 if (RequireSharedSpaces) {
3588 warning("Cannot dump shared archive while using shared archive");
3589 }
3590 UseSharedSpaces = false;
3591 #ifdef _LP64
3592 if (!UseCompressedOops || !UseCompressedClassPointers) {
3593 vm_exit_during_initialization(
3594 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL);
3595 }
3596 } else {
3597 if (!UseCompressedOops || !UseCompressedClassPointers) {
3598 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces.");
3599 }
3600 #endif
3601 }
3602 }
3603
3604 #if !INCLUDE_ALL_GCS
3605 static void force_serial_gc() {
3606 FLAG_SET_DEFAULT(UseSerialGC, true);
3607 UNSUPPORTED_GC_OPTION(UseG1GC);
3608 UNSUPPORTED_GC_OPTION(UseParallelGC);
3609 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3610 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3611 UNSUPPORTED_GC_OPTION(UseParNewGC);
3612 }
3613 #endif // INCLUDE_ALL_GCS
3614
3615 // Sharing support
3616 // Construct the path to the archive
3617 static char* get_shared_archive_path() {
3618 char *shared_archive_path;
3619 if (SharedArchiveFile == NULL) {
3620 char jvm_path[JVM_MAXPATHLEN];
3621 os::jvm_path(jvm_path, sizeof(jvm_path));
3622 char *end = strrchr(jvm_path, *os::file_separator());
3623 if (end != NULL) *end = '\0';
3624 size_t jvm_path_len = strlen(jvm_path);
3625 size_t file_sep_len = strlen(os::file_separator());
3626 const size_t len = jvm_path_len + file_sep_len + 20;
3627 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal);
3628 if (shared_archive_path != NULL) {
3629 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa",
3630 jvm_path, os::file_separator());
3631 }
3632 } else {
3633 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal);
3634 }
3635 return shared_archive_path;
3636 }
3637
3638 #ifndef PRODUCT
3639 // Determine whether LogVMOutput should be implicitly turned on.
3640 static bool use_vm_log() {
3641 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) ||
3642 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods ||
3643 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers ||
3644 PrintAssembly || TraceDeoptimization || TraceDependencies ||
3645 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) {
3646 return true;
3647 }
3648
3649 #ifdef COMPILER1
3650 if (PrintC1Statistics) {
3651 return true;
3652 }
3653 #endif // COMPILER1
3654
3655 #ifdef COMPILER2
3656 if (PrintOptoAssembly || PrintOptoStatistics) {
3657 return true;
3658 }
3659 #endif // COMPILER2
3660
3661 return false;
3662 }
3663 #endif // PRODUCT
3664
3665 static jint match_special_option_and_act(const JavaVMInitArgs* args,
3666 char** flags_file) {
3667 // Remaining part of option string
3668 const char* tail;
3669
3670 for (int index = 0; index < args->nOptions; index++) {
3671 const JavaVMOption* option = args->options + index;
3672 if (ArgumentsExt::process_options(option)) {
3673 continue;
3674 }
3675 if (match_option(option, "-XX:Flags=", &tail)) {
3676 *flags_file = (char *) tail;
3677 continue;
3678 }
3679 if (match_option(option, "-XX:+PrintVMOptions")) {
3680 PrintVMOptions = true;
3681 continue;
3682 }
3683 if (match_option(option, "-XX:-PrintVMOptions")) {
3684 PrintVMOptions = false;
3685 continue;
3686 }
3687 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) {
3688 IgnoreUnrecognizedVMOptions = true;
3689 continue;
3690 }
3691 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) {
3692 IgnoreUnrecognizedVMOptions = false;
3693 continue;
3694 }
3695 if (match_option(option, "-XX:+PrintFlagsInitial")) {
3696 CommandLineFlags::printFlags(tty, false);
3697 vm_exit(0);
3698 }
3699 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3700 #if INCLUDE_NMT
3701 // The launcher did not setup nmt environment variable properly.
3702 if (!MemTracker::check_launcher_nmt_support(tail)) {
3703 warning("Native Memory Tracking did not setup properly, using wrong launcher?");
3704 }
3705
3706 // Verify if nmt option is valid.
3707 if (MemTracker::verify_nmt_option()) {
3708 // Late initialization, still in single-threaded mode.
3709 if (MemTracker::tracking_level() >= NMT_summary) {
3710 MemTracker::init();
3711 }
3712 } else {
3713 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL);
3714 }
3715 continue;
3716 #else
3717 jio_fprintf(defaultStream::error_stream(),
3718 "Native Memory Tracking is not supported in this VM\n");
3719 return JNI_ERR;
3720 #endif
3721 }
3722
3723 #ifndef PRODUCT
3724 if (match_option(option, "-XX:+PrintFlagsWithComments")) {
3725 CommandLineFlags::printFlags(tty, true);
3726 vm_exit(0);
3727 }
3728 #endif
3729 }
3730 return JNI_OK;
3731 }
3732
3733 static void print_options(const JavaVMInitArgs *args) {
3734 const char* tail;
3735 for (int index = 0; index < args->nOptions; index++) {
3736 const JavaVMOption *option = args->options + index;
3737 if (match_option(option, "-XX:", &tail)) {
3738 logOption(tail);
3739 }
3740 }
3741 }
3742
3743 // Parse entry point called from JNI_CreateJavaVM
3744
3745 jint Arguments::parse(const JavaVMInitArgs* args) {
3746
3747 // Initialize ranges and constraints
3748 CommandLineFlagRangeList::init();
3749 CommandLineFlagConstraintList::init();
3750
3751 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3752 const char* hotspotrc = ".hotspotrc";
3753 char* flags_file = NULL;
3754 bool settings_file_specified = false;
3755 bool needs_hotspotrc_warning = false;
3756 ScopedVMInitArgs java_tool_options_args;
3757 ScopedVMInitArgs java_options_args;
3758
3759 jint code =
3760 parse_java_tool_options_environment_variable(&java_tool_options_args);
3761 if (code != JNI_OK) {
3762 return code;
3763 }
3764
3765 code = parse_java_options_environment_variable(&java_options_args);
3766 if (code != JNI_OK) {
3767 return code;
3768 }
3769
3770 code =
3771 match_special_option_and_act(java_tool_options_args.get(), &flags_file);
3772 if (code != JNI_OK) {
3773 return code;
3774 }
3775
3776 code = match_special_option_and_act(args, &flags_file);
3777 if (code != JNI_OK) {
3778 return code;
3779 }
3780
3781 code = match_special_option_and_act(java_options_args.get(), &flags_file);
3782 if (code != JNI_OK) {
3783 return code;
3784 }
3785
3786 settings_file_specified = (flags_file != NULL);
3787
3788 if (IgnoreUnrecognizedVMOptions) {
3789 // uncast const to modify the flag args->ignoreUnrecognized
3790 *(jboolean*)(&args->ignoreUnrecognized) = true;
3791 java_tool_options_args.get()->ignoreUnrecognized = true;
3792 java_options_args.get()->ignoreUnrecognized = true;
3793 }
3794
3795 // Parse specified settings file
3796 if (settings_file_specified) {
3797 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3798 return JNI_EINVAL;
3799 }
3800 } else {
3801 #ifdef ASSERT
3802 // Parse default .hotspotrc settings file
3803 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3804 return JNI_EINVAL;
3805 }
3806 #else
3807 struct stat buf;
3808 if (os::stat(hotspotrc, &buf) == 0) {
3809 needs_hotspotrc_warning = true;
3810 }
3811 #endif
3812 }
3813
3814 if (PrintVMOptions) {
3815 print_options(java_tool_options_args.get());
3816 print_options(args);
3817 print_options(java_options_args.get());
3818 }
3819
3820 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3821 jint result = parse_vm_init_args(java_tool_options_args.get(),
3822 java_options_args.get(), args);
3823
3824 if (result != JNI_OK) {
3825 return result;
3826 }
3827
3828 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3829 SharedArchivePath = get_shared_archive_path();
3830 if (SharedArchivePath == NULL) {
3831 return JNI_ENOMEM;
3832 }
3833
3834 // Set up VerifySharedSpaces
3835 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) {
3836 VerifySharedSpaces = true;
3837 }
3838
3839 // Delay warning until here so that we've had a chance to process
3840 // the -XX:-PrintWarnings flag
3841 if (needs_hotspotrc_warning) {
3842 warning("%s file is present but has been ignored. "
3843 "Run with -XX:Flags=%s to load the file.",
3844 hotspotrc, hotspotrc);
3845 }
3846
3847 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX.
3848 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3849 #endif
3850
3851 ArgumentsExt::report_unsupported_options();
3852
3853 #ifndef PRODUCT
3854 if (TraceBytecodesAt != 0) {
3855 TraceBytecodes = true;
3856 }
3857 if (CountCompiledCalls) {
3858 if (UseCounterDecay) {
3859 warning("UseCounterDecay disabled because CountCalls is set");
3860 UseCounterDecay = false;
3861 }
3862 }
3863 #endif // PRODUCT
3864
3865 if (ScavengeRootsInCode == 0) {
3866 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3867 warning("Forcing ScavengeRootsInCode non-zero");
3868 }
3869 ScavengeRootsInCode = 1;
3870 }
3871
3872 if (PrintGCDetails) {
3873 // Turn on -verbose:gc options as well
3874 PrintGC = true;
3875 }
3876
3877 // Set object alignment values.
3878 set_object_alignment();
3879
3880 #if !INCLUDE_ALL_GCS
3881 force_serial_gc();
3882 #endif // INCLUDE_ALL_GCS
3883 #if !INCLUDE_CDS
3884 if (DumpSharedSpaces || RequireSharedSpaces) {
3885 jio_fprintf(defaultStream::error_stream(),
3886 "Shared spaces are not supported in this VM\n");
3887 return JNI_ERR;
3888 }
3889 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3890 warning("Shared spaces are not supported in this VM");
3891 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3892 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3893 }
3894 no_shared_spaces("CDS Disabled");
3895 #endif // INCLUDE_CDS
3896
3897 return JNI_OK;
3898 }
3899
3900 jint Arguments::apply_ergo() {
3901
3902 // Set flags based on ergonomics.
3903 set_ergonomics_flags();
3904
3905 set_shared_spaces_flags();
3906
3907 // Check the GC selections again.
3908 if (!check_gc_consistency()) {
3909 return JNI_EINVAL;
3910 }
3911
3912 if (TieredCompilation) {
3913 set_tiered_flags();
3914 } else {
3915 int max_compilation_policy_choice = 1;
3916 #ifdef COMPILER2
3917 max_compilation_policy_choice = 2;
3918 #endif
3919 // Check if the policy is valid.
3920 if (CompilationPolicyChoice >= max_compilation_policy_choice) {
3921 vm_exit_during_initialization(
3922 "Incompatible compilation policy selected", NULL);
3923 }
3924 // Scale CompileThreshold
3925 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged.
3926 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) {
3927 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold));
3928 }
3929 }
3930
3931 #ifdef COMPILER2
3932 #ifndef PRODUCT
3933 if (PrintIdealGraphLevel > 0) {
3934 FLAG_SET_ERGO(bool, PrintIdealGraph, true);
3935 }
3936 #endif
3937 #endif
3938
3939 // Set heap size based on available physical memory
3940 set_heap_size();
3941
3942 ArgumentsExt::set_gc_specific_flags();
3943
3944 // Initialize Metaspace flags and alignments
3945 Metaspace::ergo_initialize();
3946
3947 // Set bytecode rewriting flags
3948 set_bytecode_flags();
3949
3950 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled
3951 set_aggressive_opts_flags();
3952
3953 // Turn off biased locking for locking debug mode flags,
3954 // which are subtly different from each other but neither works with
3955 // biased locking
3956 if (UseHeavyMonitors
3957 #ifdef COMPILER1
3958 || !UseFastLocking
3959 #endif // COMPILER1
3960 ) {
3961 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3962 // flag set to true on command line; warn the user that they
3963 // can't enable biased locking here
3964 warning("Biased Locking is not supported with locking debug flags"
3965 "; ignoring UseBiasedLocking flag." );
3966 }
3967 UseBiasedLocking = false;
3968 }
3969
3970 #ifdef ZERO
3971 // Clear flags not supported on zero.
3972 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3973 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3974 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3975 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false));
3976 #endif // CC_INTERP
3977
3978 #ifdef COMPILER2
3979 if (!EliminateLocks) {
3980 EliminateNestedLocks = false;
3981 }
3982 if (!Inline) {
3983 IncrementalInline = false;
3984 }
3985 #ifndef PRODUCT
3986 if (!IncrementalInline) {
3987 AlwaysIncrementalInline = false;
3988 }
3989 #endif
3990 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) {
3991 // nothing to use the profiling, turn if off
3992 FLAG_SET_DEFAULT(TypeProfileLevel, 0);
3993 }
3994 #endif
3995
3996 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3997 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3998 DebugNonSafepoints = true;
3999 }
4000
4001 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) {
4002 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used");
4003 }
4004
4005 #ifndef PRODUCT
4006 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) {
4007 if (use_vm_log()) {
4008 LogVMOutput = true;
4009 }
4010 }
4011 #endif // PRODUCT
4012
4013 if (PrintCommandLineFlags) {
4014 CommandLineFlags::printSetFlags(tty);
4015 }
4016
4017 // Apply CPU specific policy for the BiasedLocking
4018 if (UseBiasedLocking) {
4019 if (!VM_Version::use_biased_locking() &&
4020 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
4021 UseBiasedLocking = false;
4022 }
4023 }
4024 #ifdef COMPILER2
4025 if (!UseBiasedLocking || EmitSync != 0) {
4026 UseOptoBiasInlining = false;
4027 }
4028 #endif
4029
4030 return JNI_OK;
4031 }
4032
4033 jint Arguments::adjust_after_os() {
4034 if (UseNUMA) {
4035 if (UseParallelGC || UseParallelOldGC) {
4036 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
4037 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
4038 }
4039 }
4040 // UseNUMAInterleaving is set to ON for all collectors and
4041 // platforms when UseNUMA is set to ON. NUMA-aware collectors
4042 // such as the parallel collector for Linux and Solaris will
4043 // interleave old gen and survivor spaces on top of NUMA
4044 // allocation policy for the eden space.
4045 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on
4046 // all platforms and ParallelGC on Windows will interleave all
4047 // of the heap spaces across NUMA nodes.
4048 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) {
4049 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true);
4050 }
4051 }
4052 return JNI_OK;
4053 }
4054
4055 // Any custom code post the 'CommandLineFlagConstraint::AfterErgo' constraint check
4056 // can be done here. We pass a flag that specifies whether
4057 // the check passed successfully
4058 void Arguments::post_after_ergo_constraint_check(bool check_passed) {
4059 // This does not set the flag itself, but stores the value in a safe place for later usage.
4060 _min_heap_free_ratio = MinHeapFreeRatio;
4061 _max_heap_free_ratio = MaxHeapFreeRatio;
4062 }
4063
4064 int Arguments::PropertyList_count(SystemProperty* pl) {
4065 int count = 0;
4066 while(pl != NULL) {
4067 count++;
4068 pl = pl->next();
4069 }
4070 return count;
4071 }
4072
4073 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
4074 assert(key != NULL, "just checking");
4075 SystemProperty* prop;
4076 for (prop = pl; prop != NULL; prop = prop->next()) {
4077 if (strcmp(key, prop->key()) == 0) return prop->value();
4078 }
4079 return NULL;
4080 }
4081
4082 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
4083 int count = 0;
4084 const char* ret_val = NULL;
4085
4086 while(pl != NULL) {
4087 if(count >= index) {
4088 ret_val = pl->key();
4089 break;
4090 }
4091 count++;
4092 pl = pl->next();
4093 }
4094
4095 return ret_val;
4096 }
4097
4098 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
4099 int count = 0;
4100 char* ret_val = NULL;
4101
4102 while(pl != NULL) {
4103 if(count >= index) {
4104 ret_val = pl->value();
4105 break;
4106 }
4107 count++;
4108 pl = pl->next();
4109 }
4110
4111 return ret_val;
4112 }
4113
4114 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
4115 SystemProperty* p = *plist;
4116 if (p == NULL) {
4117 *plist = new_p;
4118 } else {
4119 while (p->next() != NULL) {
4120 p = p->next();
4121 }
4122 p->set_next(new_p);
4123 }
4124 }
4125
4126 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
4127 if (plist == NULL)
4128 return;
4129
4130 SystemProperty* new_p = new SystemProperty(k, v, true);
4131 PropertyList_add(plist, new_p);
4132 }
4133
4134 void Arguments::PropertyList_add(SystemProperty *element) {
4135 PropertyList_add(&_system_properties, element);
4136 }
4137
4138 // This add maintains unique property key in the list.
4139 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
4140 if (plist == NULL)
4141 return;
4142
4143 // If property key exist then update with new value.
4144 SystemProperty* prop;
4145 for (prop = *plist; prop != NULL; prop = prop->next()) {
4146 if (strcmp(k, prop->key()) == 0) {
4147 if (append) {
4148 prop->append_value(v);
4149 } else {
4150 prop->set_value(v);
4151 }
4152 return;
4153 }
4154 }
4155
4156 PropertyList_add(plist, k, v);
4157 }
4158
4159 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
4160 // Returns true if all of the source pointed by src has been copied over to
4161 // the destination buffer pointed by buf. Otherwise, returns false.
4162 // Notes:
4163 // 1. If the length (buflen) of the destination buffer excluding the
4164 // NULL terminator character is not long enough for holding the expanded
4165 // pid characters, it also returns false instead of returning the partially
4166 // expanded one.
4167 // 2. The passed in "buflen" should be large enough to hold the null terminator.
4168 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
4169 char* buf, size_t buflen) {
4170 const char* p = src;
4171 char* b = buf;
4172 const char* src_end = &src[srclen];
4173 char* buf_end = &buf[buflen - 1];
4174
4175 while (p < src_end && b < buf_end) {
4176 if (*p == '%') {
4177 switch (*(++p)) {
4178 case '%': // "%%" ==> "%"
4179 *b++ = *p++;
4180 break;
4181 case 'p': { // "%p" ==> current process id
4182 // buf_end points to the character before the last character so
4183 // that we could write '\0' to the end of the buffer.
4184 size_t buf_sz = buf_end - b + 1;
4185 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
4186
4187 // if jio_snprintf fails or the buffer is not long enough to hold
4188 // the expanded pid, returns false.
4189 if (ret < 0 || ret >= (int)buf_sz) {
4190 return false;
4191 } else {
4192 b += ret;
4193 assert(*b == '\0', "fail in copy_expand_pid");
4194 if (p == src_end && b == buf_end + 1) {
4195 // reach the end of the buffer.
4196 return true;
4197 }
4198 }
4199 p++;
4200 break;
4201 }
4202 default :
4203 *b++ = '%';
4204 }
4205 } else {
4206 *b++ = *p++;
4207 }
4208 }
4209 *b = '\0';
4210 return (p == src_end); // return false if not all of the source was copied
4211 }