1 /*
2 * Copyright (c) 1997, 2013, 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/javaAssertions.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "compiler/compilerOracle.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/cardTableRS.hpp"
31 #include "memory/referenceProcessor.hpp"
32 #include "memory/universe.inline.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "prims/jvmtiExport.hpp"
35 #include "runtime/arguments.hpp"
36 #include "runtime/globals_extension.hpp"
37 #include "runtime/java.hpp"
38 #include "services/management.hpp"
39 #include "services/memTracker.hpp"
40 #include "utilities/defaultStream.hpp"
41 #include "utilities/macros.hpp"
42 #include "utilities/taskqueue.hpp"
43 #ifdef TARGET_OS_FAMILY_linux
44 # include "os_linux.inline.hpp"
45 #endif
46 #ifdef TARGET_OS_FAMILY_solaris
47 # include "os_solaris.inline.hpp"
48 #endif
49 #ifdef TARGET_OS_FAMILY_windows
50 # include "os_windows.inline.hpp"
51 #endif
52 #ifdef TARGET_OS_FAMILY_bsd
53 # include "os_bsd.inline.hpp"
54 #endif
55 #if INCLUDE_ALL_GCS
56 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
57 #endif // INCLUDE_ALL_GCS
58
59 // Note: This is a special bug reporting site for the JVM
60 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
61 #define DEFAULT_JAVA_LAUNCHER "generic"
62
63 char** Arguments::_jvm_flags_array = NULL;
64 int Arguments::_num_jvm_flags = 0;
65 char** Arguments::_jvm_args_array = NULL;
66 int Arguments::_num_jvm_args = 0;
67 char* Arguments::_java_command = NULL;
68 SystemProperty* Arguments::_system_properties = NULL;
69 const char* Arguments::_gc_log_filename = NULL;
70 bool Arguments::_has_profile = false;
71 bool Arguments::_has_alloc_profile = false;
72 uintx Arguments::_min_heap_size = 0;
73 Arguments::Mode Arguments::_mode = _mixed;
74 bool Arguments::_java_compiler = false;
75 bool Arguments::_xdebug_mode = false;
76 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
77 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
78 int Arguments::_sun_java_launcher_pid = -1;
79 bool Arguments::_created_by_gamma_launcher = false;
80
81 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
82 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
83 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
84 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
85 bool Arguments::_ClipInlining = ClipInlining;
86
87 char* Arguments::SharedArchivePath = NULL;
88
89 AgentLibraryList Arguments::_libraryList;
90 AgentLibraryList Arguments::_agentList;
91
92 abort_hook_t Arguments::_abort_hook = NULL;
93 exit_hook_t Arguments::_exit_hook = NULL;
94 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
95
96
97 SystemProperty *Arguments::_java_ext_dirs = NULL;
98 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
99 SystemProperty *Arguments::_sun_boot_library_path = NULL;
100 SystemProperty *Arguments::_java_library_path = NULL;
101 SystemProperty *Arguments::_java_home = NULL;
102 SystemProperty *Arguments::_java_class_path = NULL;
103 SystemProperty *Arguments::_sun_boot_class_path = NULL;
104
105 char* Arguments::_meta_index_path = NULL;
106 char* Arguments::_meta_index_dir = NULL;
107
108 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
109
110 static bool match_option(const JavaVMOption *option, const char* name,
111 const char** tail) {
112 int len = (int)strlen(name);
113 if (strncmp(option->optionString, name, len) == 0) {
114 *tail = option->optionString + len;
115 return true;
116 } else {
117 return false;
118 }
119 }
120
121 static void logOption(const char* opt) {
122 if (PrintVMOptions) {
123 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
124 }
125 }
126
127 // Process java launcher properties.
128 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
129 // See if sun.java.launcher or sun.java.launcher.pid is defined.
130 // Must do this before setting up other system properties,
131 // as some of them may depend on launcher type.
132 for (int index = 0; index < args->nOptions; index++) {
133 const JavaVMOption* option = args->options + index;
134 const char* tail;
135
136 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
137 process_java_launcher_argument(tail, option->extraInfo);
138 continue;
139 }
140 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
141 _sun_java_launcher_pid = atoi(tail);
142 continue;
143 }
144 }
145 }
146
147 // Initialize system properties key and value.
148 void Arguments::init_system_properties() {
149
150 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
151 "Java Virtual Machine Specification", false));
152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
154 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
155
156 // following are JVMTI agent writeable properties.
157 // Properties values are set to NULL and they are
158 // os specific they are initialized in os::init_system_properties_values().
159 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
160 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
161 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
162 _java_library_path = new SystemProperty("java.library.path", NULL, true);
163 _java_home = new SystemProperty("java.home", NULL, true);
164 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
165
166 _java_class_path = new SystemProperty("java.class.path", "", true);
167
168 // Add to System Property list.
169 PropertyList_add(&_system_properties, _java_ext_dirs);
170 PropertyList_add(&_system_properties, _java_endorsed_dirs);
171 PropertyList_add(&_system_properties, _sun_boot_library_path);
172 PropertyList_add(&_system_properties, _java_library_path);
173 PropertyList_add(&_system_properties, _java_home);
174 PropertyList_add(&_system_properties, _java_class_path);
175 PropertyList_add(&_system_properties, _sun_boot_class_path);
176
177 // Set OS specific system properties values
178 os::init_system_properties_values();
179 }
180
181
182 // Update/Initialize System properties after JDK version number is known
183 void Arguments::init_version_specific_system_properties() {
184 enum { bufsz = 16 };
185 char buffer[bufsz];
186 const char* spec_vendor = "Sun Microsystems Inc.";
187 uint32_t spec_version = 0;
188
189 if (JDK_Version::is_gte_jdk17x_version()) {
190 spec_vendor = "Oracle Corporation";
191 spec_version = JDK_Version::current().major_version();
192 }
193 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
194
195 PropertyList_add(&_system_properties,
196 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
197 PropertyList_add(&_system_properties,
198 new SystemProperty("java.vm.specification.version", buffer, false));
199 PropertyList_add(&_system_properties,
200 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
201 }
202
203 /**
204 * Provide a slightly more user-friendly way of eliminating -XX flags.
205 * When a flag is eliminated, it can be added to this list in order to
206 * continue accepting this flag on the command-line, while issuing a warning
207 * and ignoring the value. Once the JDK version reaches the 'accept_until'
208 * limit, we flatly refuse to admit the existence of the flag. This allows
209 * a flag to die correctly over JDK releases using HSX.
210 */
211 typedef struct {
212 const char* name;
213 JDK_Version obsoleted_in; // when the flag went away
214 JDK_Version accept_until; // which version to start denying the existence
215 } ObsoleteFlag;
216
217 static ObsoleteFlag obsolete_jvm_flags[] = {
218 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
230 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
231 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
232 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
233 { "DefaultInitialRAMFraction",
234 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
235 { "UseDepthFirstScavengeOrder",
236 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
237 { "HandlePromotionFailure",
238 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
239 { "MaxLiveObjectEvacuationRatio",
240 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
241 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
242 { "UseParallelOldGCCompacting",
243 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
244 { "UseParallelDensePrefixUpdate",
245 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
246 { "UseParallelOldGCDensePrefix",
247 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
248 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
249 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
250 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
251 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
252 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
253 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
254 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
255 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
256 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
257 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
258 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
259 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
260 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
261 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
262 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
263 #ifdef PRODUCT
264 { "DesiredMethodLimit",
265 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
266 #endif // PRODUCT
267 { NULL, JDK_Version(0), JDK_Version(0) }
268 };
269
270 // Returns true if the flag is obsolete and fits into the range specified
271 // for being ignored. In the case that the flag is ignored, the 'version'
272 // value is filled in with the version number when the flag became
273 // obsolete so that that value can be displayed to the user.
274 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
275 int i = 0;
276 assert(version != NULL, "Must provide a version buffer");
277 while (obsolete_jvm_flags[i].name != NULL) {
278 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
279 // <flag>=xxx form
280 // [-|+]<flag> form
281 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
282 ((s[0] == '+' || s[0] == '-') &&
283 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
284 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
285 *version = flag_status.obsoleted_in;
286 return true;
287 }
288 }
289 i++;
290 }
291 return false;
292 }
293
294 // Constructs the system class path (aka boot class path) from the following
295 // components, in order:
296 //
297 // prefix // from -Xbootclasspath/p:...
298 // endorsed // the expansion of -Djava.endorsed.dirs=...
299 // base // from os::get_system_properties() or -Xbootclasspath=
300 // suffix // from -Xbootclasspath/a:...
301 //
302 // java.endorsed.dirs is a list of directories; any jar or zip files in the
303 // directories are added to the sysclasspath just before the base.
304 //
305 // This could be AllStatic, but it isn't needed after argument processing is
306 // complete.
307 class SysClassPath: public StackObj {
308 public:
309 SysClassPath(const char* base);
310 ~SysClassPath();
311
312 inline void set_base(const char* base);
313 inline void add_prefix(const char* prefix);
314 inline void add_suffix_to_prefix(const char* suffix);
315 inline void add_suffix(const char* suffix);
316 inline void reset_path(const char* base);
317
318 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
319 // property. Must be called after all command-line arguments have been
320 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
321 // combined_path().
322 void expand_endorsed();
323
324 inline const char* get_base() const { return _items[_scp_base]; }
325 inline const char* get_prefix() const { return _items[_scp_prefix]; }
326 inline const char* get_suffix() const { return _items[_scp_suffix]; }
327 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
328
329 // Combine all the components into a single c-heap-allocated string; caller
330 // must free the string if/when no longer needed.
331 char* combined_path();
332
333 private:
334 // Utility routines.
335 static char* add_to_path(const char* path, const char* str, bool prepend);
336 static char* add_jars_to_path(char* path, const char* directory);
337
338 inline void reset_item_at(int index);
339
340 // Array indices for the items that make up the sysclasspath. All except the
341 // base are allocated in the C heap and freed by this class.
342 enum {
343 _scp_prefix, // from -Xbootclasspath/p:...
344 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
345 _scp_base, // the default sysclasspath
346 _scp_suffix, // from -Xbootclasspath/a:...
347 _scp_nitems // the number of items, must be last.
348 };
349
350 const char* _items[_scp_nitems];
351 DEBUG_ONLY(bool _expansion_done;)
352 };
353
354 SysClassPath::SysClassPath(const char* base) {
355 memset(_items, 0, sizeof(_items));
356 _items[_scp_base] = base;
357 DEBUG_ONLY(_expansion_done = false;)
358 }
359
360 SysClassPath::~SysClassPath() {
361 // Free everything except the base.
362 for (int i = 0; i < _scp_nitems; ++i) {
363 if (i != _scp_base) reset_item_at(i);
364 }
365 DEBUG_ONLY(_expansion_done = false;)
366 }
367
368 inline void SysClassPath::set_base(const char* base) {
369 _items[_scp_base] = base;
370 }
371
372 inline void SysClassPath::add_prefix(const char* prefix) {
373 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
374 }
375
376 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
377 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
378 }
379
380 inline void SysClassPath::add_suffix(const char* suffix) {
381 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
382 }
383
384 inline void SysClassPath::reset_item_at(int index) {
385 assert(index < _scp_nitems && index != _scp_base, "just checking");
386 if (_items[index] != NULL) {
387 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
388 _items[index] = NULL;
389 }
390 }
391
392 inline void SysClassPath::reset_path(const char* base) {
393 // Clear the prefix and suffix.
394 reset_item_at(_scp_prefix);
395 reset_item_at(_scp_suffix);
396 set_base(base);
397 }
398
399 //------------------------------------------------------------------------------
400
401 void SysClassPath::expand_endorsed() {
402 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
403
404 const char* path = Arguments::get_property("java.endorsed.dirs");
405 if (path == NULL) {
406 path = Arguments::get_endorsed_dir();
407 assert(path != NULL, "no default for java.endorsed.dirs");
408 }
409
410 char* expanded_path = NULL;
411 const char separator = *os::path_separator();
412 const char* const end = path + strlen(path);
413 while (path < end) {
414 const char* tmp_end = strchr(path, separator);
415 if (tmp_end == NULL) {
416 expanded_path = add_jars_to_path(expanded_path, path);
417 path = end;
418 } else {
419 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
420 memcpy(dirpath, path, tmp_end - path);
421 dirpath[tmp_end - path] = '\0';
422 expanded_path = add_jars_to_path(expanded_path, dirpath);
423 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
424 path = tmp_end + 1;
425 }
426 }
427 _items[_scp_endorsed] = expanded_path;
428 DEBUG_ONLY(_expansion_done = true;)
429 }
430
431 // Combine the bootclasspath elements, some of which may be null, into a single
432 // c-heap-allocated string.
433 char* SysClassPath::combined_path() {
434 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
435 assert(_expansion_done, "must call expand_endorsed() first.");
436
437 size_t lengths[_scp_nitems];
438 size_t total_len = 0;
439
440 const char separator = *os::path_separator();
441
442 // Get the lengths.
443 int i;
444 for (i = 0; i < _scp_nitems; ++i) {
445 if (_items[i] != NULL) {
446 lengths[i] = strlen(_items[i]);
447 // Include space for the separator char (or a NULL for the last item).
448 total_len += lengths[i] + 1;
449 }
450 }
451 assert(total_len > 0, "empty sysclasspath not allowed");
452
453 // Copy the _items to a single string.
454 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
455 char* cp_tmp = cp;
456 for (i = 0; i < _scp_nitems; ++i) {
457 if (_items[i] != NULL) {
458 memcpy(cp_tmp, _items[i], lengths[i]);
459 cp_tmp += lengths[i];
460 *cp_tmp++ = separator;
461 }
462 }
463 *--cp_tmp = '\0'; // Replace the extra separator.
464 return cp;
465 }
466
467 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
468 char*
469 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
470 char *cp;
471
472 assert(str != NULL, "just checking");
473 if (path == NULL) {
474 size_t len = strlen(str) + 1;
475 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
476 memcpy(cp, str, len); // copy the trailing null
477 } else {
478 const char separator = *os::path_separator();
479 size_t old_len = strlen(path);
480 size_t str_len = strlen(str);
481 size_t len = old_len + str_len + 2;
482
483 if (prepend) {
484 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
485 char* cp_tmp = cp;
486 memcpy(cp_tmp, str, str_len);
487 cp_tmp += str_len;
488 *cp_tmp = separator;
489 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
490 FREE_C_HEAP_ARRAY(char, path, mtInternal);
491 } else {
492 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
493 char* cp_tmp = cp + old_len;
494 *cp_tmp = separator;
495 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
496 }
497 }
498 return cp;
499 }
500
501 // Scan the directory and append any jar or zip files found to path.
502 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
503 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
504 DIR* dir = os::opendir(directory);
505 if (dir == NULL) return path;
506
507 char dir_sep[2] = { '\0', '\0' };
508 size_t directory_len = strlen(directory);
509 const char fileSep = *os::file_separator();
510 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
511
512 /* Scan the directory for jars/zips, appending them to path. */
513 struct dirent *entry;
514 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
515 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
516 const char* name = entry->d_name;
517 const char* ext = name + strlen(name) - 4;
518 bool isJarOrZip = ext > name &&
519 (os::file_name_strcmp(ext, ".jar") == 0 ||
520 os::file_name_strcmp(ext, ".zip") == 0);
521 if (isJarOrZip) {
522 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
523 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
524 path = add_to_path(path, jarpath, false);
525 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
526 }
527 }
528 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
529 os::closedir(dir);
530 return path;
531 }
532
533 // Parses a memory size specification string.
534 static bool atomull(const char *s, julong* result) {
535 julong n = 0;
536 int args_read = sscanf(s, JULONG_FORMAT, &n);
537 if (args_read != 1) {
538 return false;
539 }
540 while (*s != '\0' && isdigit(*s)) {
541 s++;
542 }
543 // 4705540: illegal if more characters are found after the first non-digit
544 if (strlen(s) > 1) {
545 return false;
546 }
547 switch (*s) {
548 case 'T': case 't':
549 *result = n * G * K;
550 // Check for overflow.
551 if (*result/((julong)G * K) != n) return false;
552 return true;
553 case 'G': case 'g':
554 *result = n * G;
555 if (*result/G != n) return false;
556 return true;
557 case 'M': case 'm':
558 *result = n * M;
559 if (*result/M != n) return false;
560 return true;
561 case 'K': case 'k':
562 *result = n * K;
563 if (*result/K != n) return false;
564 return true;
565 case '\0':
566 *result = n;
567 return true;
568 default:
569 return false;
570 }
571 }
572
573 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
574 if (size < min_size) return arg_too_small;
575 // Check that size will fit in a size_t (only relevant on 32-bit)
576 if (size > max_uintx) return arg_too_big;
577 return arg_in_range;
578 }
579
580 // Describe an argument out of range error
581 void Arguments::describe_range_error(ArgsRange errcode) {
582 switch(errcode) {
583 case arg_too_big:
584 jio_fprintf(defaultStream::error_stream(),
585 "The specified size exceeds the maximum "
586 "representable size.\n");
587 break;
588 case arg_too_small:
589 case arg_unreadable:
590 case arg_in_range:
591 // do nothing for now
592 break;
593 default:
594 ShouldNotReachHere();
595 }
596 }
597
598 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
599 return CommandLineFlags::boolAtPut(name, &value, origin);
600 }
601
602 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
603 double v;
604 if (sscanf(value, "%lf", &v) != 1) {
605 return false;
606 }
607
608 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
609 return true;
610 }
611 return false;
612 }
613
614 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
615 julong v;
616 intx intx_v;
617 bool is_neg = false;
618 // Check the sign first since atomull() parses only unsigned values.
619 if (*value == '-') {
620 if (!CommandLineFlags::intxAt(name, &intx_v)) {
621 return false;
622 }
623 value++;
624 is_neg = true;
625 }
626 if (!atomull(value, &v)) {
627 return false;
628 }
629 intx_v = (intx) v;
630 if (is_neg) {
631 intx_v = -intx_v;
632 }
633 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
634 return true;
635 }
636 uintx uintx_v = (uintx) v;
637 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
638 return true;
639 }
640 uint64_t uint64_t_v = (uint64_t) v;
641 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
642 return true;
643 }
644 return false;
645 }
646
647 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
648 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
649 // Contract: CommandLineFlags always returns a pointer that needs freeing.
650 FREE_C_HEAP_ARRAY(char, value, mtInternal);
651 return true;
652 }
653
654 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
655 const char* old_value = "";
656 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
657 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
658 size_t new_len = strlen(new_value);
659 const char* value;
660 char* free_this_too = NULL;
661 if (old_len == 0) {
662 value = new_value;
663 } else if (new_len == 0) {
664 value = old_value;
665 } else {
666 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
667 // each new setting adds another LINE to the switch:
668 sprintf(buf, "%s\n%s", old_value, new_value);
669 value = buf;
670 free_this_too = buf;
671 }
672 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
673 // CommandLineFlags always returns a pointer that needs freeing.
674 FREE_C_HEAP_ARRAY(char, value, mtInternal);
675 if (free_this_too != NULL) {
676 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
677 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
678 }
679 return true;
680 }
681
682 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
683
684 // range of acceptable characters spelled out for portability reasons
685 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
686 #define BUFLEN 255
687 char name[BUFLEN+1];
688 char dummy;
689
690 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
691 return set_bool_flag(name, false, origin);
692 }
693 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
694 return set_bool_flag(name, true, origin);
695 }
696
697 char punct;
698 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
699 const char* value = strchr(arg, '=') + 1;
700 Flag* flag = Flag::find_flag(name, strlen(name));
701 if (flag != NULL && flag->is_ccstr()) {
702 if (flag->ccstr_accumulates()) {
703 return append_to_string_flag(name, value, origin);
704 } else {
705 if (value[0] == '\0') {
706 value = NULL;
707 }
708 return set_string_flag(name, value, origin);
709 }
710 }
711 }
712
713 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
714 const char* value = strchr(arg, '=') + 1;
715 // -XX:Foo:=xxx will reset the string flag to the given value.
716 if (value[0] == '\0') {
717 value = NULL;
718 }
719 return set_string_flag(name, value, origin);
720 }
721
722 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
723 #define SIGNED_NUMBER_RANGE "[-0123456789]"
724 #define NUMBER_RANGE "[0123456789]"
725 char value[BUFLEN + 1];
726 char value2[BUFLEN + 1];
727 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
728 // Looks like a floating-point number -- try again with more lenient format string
729 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
730 return set_fp_numeric_flag(name, value, origin);
731 }
732 }
733
734 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
735 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
736 return set_numeric_flag(name, value, origin);
737 }
738
739 return false;
740 }
741
742 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
743 assert(bldarray != NULL, "illegal argument");
744
745 if (arg == NULL) {
746 return;
747 }
748
749 int index = *count;
750
751 // expand the array and add arg to the last element
752 (*count)++;
753 if (*bldarray == NULL) {
754 *bldarray = NEW_C_HEAP_ARRAY(char*, *count, mtInternal);
755 } else {
756 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count, mtInternal);
757 }
758 (*bldarray)[index] = strdup(arg);
759 }
760
761 void Arguments::build_jvm_args(const char* arg) {
762 add_string(&_jvm_args_array, &_num_jvm_args, arg);
763 }
764
765 void Arguments::build_jvm_flags(const char* arg) {
766 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
767 }
768
769 // utility function to return a string that concatenates all
770 // strings in a given char** array
771 const char* Arguments::build_resource_string(char** args, int count) {
772 if (args == NULL || count == 0) {
773 return NULL;
774 }
775 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
776 for (int i = 1; i < count; i++) {
777 length += strlen(args[i]) + 1; // add 1 for a space
778 }
779 char* s = NEW_RESOURCE_ARRAY(char, length);
780 strcpy(s, args[0]);
781 for (int j = 1; j < count; j++) {
782 strcat(s, " ");
783 strcat(s, args[j]);
784 }
785 return (const char*) s;
786 }
787
788 void Arguments::print_on(outputStream* st) {
789 st->print_cr("VM Arguments:");
790 if (num_jvm_flags() > 0) {
791 st->print("jvm_flags: "); print_jvm_flags_on(st);
792 }
793 if (num_jvm_args() > 0) {
794 st->print("jvm_args: "); print_jvm_args_on(st);
795 }
796 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
797 if (_java_class_path != NULL) {
798 char* path = _java_class_path->value();
799 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
800 }
801 st->print_cr("Launcher Type: %s", _sun_java_launcher);
802 }
803
804 void Arguments::print_jvm_flags_on(outputStream* st) {
805 if (_num_jvm_flags > 0) {
806 for (int i=0; i < _num_jvm_flags; i++) {
807 st->print("%s ", _jvm_flags_array[i]);
808 }
809 st->print_cr("");
810 }
811 }
812
813 void Arguments::print_jvm_args_on(outputStream* st) {
814 if (_num_jvm_args > 0) {
815 for (int i=0; i < _num_jvm_args; i++) {
816 st->print("%s ", _jvm_args_array[i]);
817 }
818 st->print_cr("");
819 }
820 }
821
822 bool Arguments::process_argument(const char* arg,
823 jboolean ignore_unrecognized, FlagValueOrigin origin) {
824
825 JDK_Version since = JDK_Version();
826
827 if (parse_argument(arg, origin) || ignore_unrecognized) {
828 return true;
829 }
830
831 bool has_plus_minus = (*arg == '+' || *arg == '-');
832 const char* const argname = has_plus_minus ? arg + 1 : arg;
833 if (is_newly_obsolete(arg, &since)) {
834 char version[256];
835 since.to_string(version, sizeof(version));
836 warning("ignoring option %s; support was removed in %s", argname, version);
837 return true;
838 }
839
840 // For locked flags, report a custom error message if available.
841 // Otherwise, report the standard unrecognized VM option.
842
843 size_t arg_len;
844 const char* equal_sign = strchr(argname, '=');
845 if (equal_sign == NULL) {
846 arg_len = strlen(argname);
847 } else {
848 arg_len = equal_sign - argname;
849 }
850
851 Flag* found_flag = Flag::find_flag((char*)argname, arg_len, true);
852 if (found_flag != NULL) {
853 char locked_message_buf[BUFLEN];
854 found_flag->get_locked_message(locked_message_buf, BUFLEN);
855 if (strlen(locked_message_buf) == 0) {
856 if (found_flag->is_bool() && !has_plus_minus) {
857 jio_fprintf(defaultStream::error_stream(),
858 "Missing +/- setting for VM option '%s'\n", argname);
859 } else if (!found_flag->is_bool() && has_plus_minus) {
860 jio_fprintf(defaultStream::error_stream(),
861 "Unexpected +/- setting in VM option '%s'\n", argname);
862 } else {
863 jio_fprintf(defaultStream::error_stream(),
864 "Improperly specified VM option '%s'\n", argname);
865 }
866 } else {
867 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
868 }
869 } else {
870 jio_fprintf(defaultStream::error_stream(),
871 "Unrecognized VM option '%s'\n", argname);
872 }
873
874 // allow for commandline "commenting out" options like -XX:#+Verbose
875 return arg[0] == '#';
876 }
877
878 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
879 FILE* stream = fopen(file_name, "rb");
880 if (stream == NULL) {
881 if (should_exist) {
882 jio_fprintf(defaultStream::error_stream(),
883 "Could not open settings file %s\n", file_name);
884 return false;
885 } else {
886 return true;
887 }
888 }
889
890 char token[1024];
891 int pos = 0;
892
893 bool in_white_space = true;
894 bool in_comment = false;
895 bool in_quote = false;
896 char quote_c = 0;
897 bool result = true;
898
899 int c = getc(stream);
900 while(c != EOF && pos < (int)(sizeof(token)-1)) {
901 if (in_white_space) {
902 if (in_comment) {
903 if (c == '\n') in_comment = false;
904 } else {
905 if (c == '#') in_comment = true;
906 else if (!isspace(c)) {
907 in_white_space = false;
908 token[pos++] = c;
909 }
910 }
911 } else {
912 if (c == '\n' || (!in_quote && isspace(c))) {
913 // token ends at newline, or at unquoted whitespace
914 // this allows a way to include spaces in string-valued options
915 token[pos] = '\0';
916 logOption(token);
917 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
918 build_jvm_flags(token);
919 pos = 0;
920 in_white_space = true;
921 in_quote = false;
922 } else if (!in_quote && (c == '\'' || c == '"')) {
923 in_quote = true;
924 quote_c = c;
925 } else if (in_quote && (c == quote_c)) {
926 in_quote = false;
927 } else {
928 token[pos++] = c;
929 }
930 }
931 c = getc(stream);
932 }
933 if (pos > 0) {
934 token[pos] = '\0';
935 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
936 build_jvm_flags(token);
937 }
938 fclose(stream);
939 return result;
940 }
941
942 //=============================================================================================================
943 // Parsing of properties (-D)
944
945 const char* Arguments::get_property(const char* key) {
946 return PropertyList_get_value(system_properties(), key);
947 }
948
949 bool Arguments::add_property(const char* prop) {
950 const char* eq = strchr(prop, '=');
951 char* key;
952 // ns must be static--its address may be stored in a SystemProperty object.
953 const static char ns[1] = {0};
954 char* value = (char *)ns;
955
956 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
957 key = AllocateHeap(key_len + 1, mtInternal);
958 strncpy(key, prop, key_len);
959 key[key_len] = '\0';
960
961 if (eq != NULL) {
962 size_t value_len = strlen(prop) - key_len - 1;
963 value = AllocateHeap(value_len + 1, mtInternal);
964 strncpy(value, &prop[key_len + 1], value_len + 1);
965 }
966
967 if (strcmp(key, "java.compiler") == 0) {
968 process_java_compiler_argument(value);
969 FreeHeap(key);
970 if (eq != NULL) {
971 FreeHeap(value);
972 }
973 return true;
974 } else if (strcmp(key, "sun.java.command") == 0) {
975 _java_command = value;
976
977 // Record value in Arguments, but let it get passed to Java.
978 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
979 // launcher.pid property is private and is processed
980 // in process_sun_java_launcher_properties();
981 // the sun.java.launcher property is passed on to the java application
982 FreeHeap(key);
983 if (eq != NULL) {
984 FreeHeap(value);
985 }
986 return true;
987 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
988 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
989 // its value without going through the property list or making a Java call.
990 _java_vendor_url_bug = value;
991 } else if (strcmp(key, "sun.boot.library.path") == 0) {
992 PropertyList_unique_add(&_system_properties, key, value, true);
993 return true;
994 }
995 // Create new property and add at the end of the list
996 PropertyList_unique_add(&_system_properties, key, value);
997 return true;
998 }
999
1000 //===========================================================================================================
1001 // Setting int/mixed/comp mode flags
1002
1003 void Arguments::set_mode_flags(Mode mode) {
1004 // Set up default values for all flags.
1005 // If you add a flag to any of the branches below,
1006 // add a default value for it here.
1007 set_java_compiler(false);
1008 _mode = mode;
1009
1010 // Ensure Agent_OnLoad has the correct initial values.
1011 // This may not be the final mode; mode may change later in onload phase.
1012 PropertyList_unique_add(&_system_properties, "java.vm.info",
1013 (char*)VM_Version::vm_info_string(), false);
1014
1015 UseInterpreter = true;
1016 UseCompiler = true;
1017 UseLoopCounter = true;
1018
1019 #ifndef ZERO
1020 // Turn these off for mixed and comp. Leave them on for Zero.
1021 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1022 UseFastAccessorMethods = (mode == _int);
1023 }
1024 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1025 UseFastEmptyMethods = (mode == _int);
1026 }
1027 #endif
1028
1029 // Default values may be platform/compiler dependent -
1030 // use the saved values
1031 ClipInlining = Arguments::_ClipInlining;
1032 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1033 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1034 BackgroundCompilation = Arguments::_BackgroundCompilation;
1035
1036 // Change from defaults based on mode
1037 switch (mode) {
1038 default:
1039 ShouldNotReachHere();
1040 break;
1041 case _int:
1042 UseCompiler = false;
1043 UseLoopCounter = false;
1044 AlwaysCompileLoopMethods = false;
1045 UseOnStackReplacement = false;
1046 break;
1047 case _mixed:
1048 // same as default
1049 break;
1050 case _comp:
1051 UseInterpreter = false;
1052 BackgroundCompilation = false;
1053 ClipInlining = false;
1054 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1055 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1056 // compile a level 4 (C2) and then continue executing it.
1057 if (TieredCompilation) {
1058 Tier3InvokeNotifyFreqLog = 0;
1059 Tier4InvocationThreshold = 0;
1060 }
1061 break;
1062 }
1063 }
1064
1065 // Conflict: required to use shared spaces (-Xshare:on), but
1066 // incompatible command line options were chosen.
1067
1068 static void no_shared_spaces() {
1069 if (RequireSharedSpaces) {
1070 jio_fprintf(defaultStream::error_stream(),
1071 "Class data sharing is inconsistent with other specified options.\n");
1072 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1073 } else {
1074 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1075 }
1076 }
1077
1078 void Arguments::set_tiered_flags() {
1079 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1080 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1081 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1082 }
1083 if (CompilationPolicyChoice < 2) {
1084 vm_exit_during_initialization(
1085 "Incompatible compilation policy selected", NULL);
1086 }
1087 // Increase the code cache size - tiered compiles a lot more.
1088 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1089 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1090 }
1091 }
1092
1093 #if INCLUDE_ALL_GCS
1094 static void disable_adaptive_size_policy(const char* collector_name) {
1095 if (UseAdaptiveSizePolicy) {
1096 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1097 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1098 collector_name);
1099 }
1100 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1101 }
1102 }
1103
1104 void Arguments::set_parnew_gc_flags() {
1105 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1106 "control point invariant");
1107 assert(UseParNewGC, "Error");
1108
1109 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1110 disable_adaptive_size_policy("UseParNewGC");
1111
1112 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1113 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1114 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1115 } else if (ParallelGCThreads == 0) {
1116 jio_fprintf(defaultStream::error_stream(),
1117 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1118 vm_exit(1);
1119 }
1120
1121 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1122 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1123 // we set them to 1024 and 1024.
1124 // See CR 6362902.
1125 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1126 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1127 }
1128 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1129 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1130 }
1131
1132 // AlwaysTenure flag should make ParNew promote all at first collection.
1133 // See CR 6362902.
1134 if (AlwaysTenure) {
1135 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1136 }
1137 // When using compressed oops, we use local overflow stacks,
1138 // rather than using a global overflow list chained through
1139 // the klass word of the object's pre-image.
1140 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1141 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1142 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1143 }
1144 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1145 }
1146 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1147 }
1148
1149 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1150 // sparc/solaris for certain applications, but would gain from
1151 // further optimization and tuning efforts, and would almost
1152 // certainly gain from analysis of platform and environment.
1153 void Arguments::set_cms_and_parnew_gc_flags() {
1154 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1155 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1156
1157 // If we are using CMS, we prefer to UseParNewGC,
1158 // unless explicitly forbidden.
1159 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1160 FLAG_SET_ERGO(bool, UseParNewGC, true);
1161 }
1162
1163 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1164 disable_adaptive_size_policy("UseConcMarkSweepGC");
1165
1166 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1167 // as needed.
1168 if (UseParNewGC) {
1169 set_parnew_gc_flags();
1170 }
1171
1172 // MaxHeapSize is aligned down in collectorPolicy
1173 size_t max_heap = align_size_down(MaxHeapSize,
1174 CardTableRS::ct_max_alignment_constraint());
1175
1176 // Now make adjustments for CMS
1177 intx tenuring_default = (intx)6;
1178 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1179
1180 // Preferred young gen size for "short" pauses:
1181 // upper bound depends on # of threads and NewRatio.
1182 const uintx parallel_gc_threads =
1183 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1184 const size_t preferred_max_new_size_unaligned =
1185 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1186 size_t preferred_max_new_size =
1187 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1188
1189 // Unless explicitly requested otherwise, size young gen
1190 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1191
1192 // If either MaxNewSize or NewRatio is set on the command line,
1193 // assume the user is trying to set the size of the young gen.
1194 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1195
1196 // Set MaxNewSize to our calculated preferred_max_new_size unless
1197 // NewSize was set on the command line and it is larger than
1198 // preferred_max_new_size.
1199 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1200 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1201 } else {
1202 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1203 }
1204 if (PrintGCDetails && Verbose) {
1205 // Too early to use gclog_or_tty
1206 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1207 }
1208
1209 // Code along this path potentially sets NewSize and OldSize
1210
1211 assert(max_heap >= InitialHeapSize, "Error");
1212 assert(max_heap >= NewSize, "Error");
1213
1214 if (PrintGCDetails && Verbose) {
1215 // Too early to use gclog_or_tty
1216 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1217 " initial_heap_size: " SIZE_FORMAT
1218 " max_heap: " SIZE_FORMAT,
1219 min_heap_size(), InitialHeapSize, max_heap);
1220 }
1221 size_t min_new = preferred_max_new_size;
1222 if (FLAG_IS_CMDLINE(NewSize)) {
1223 min_new = NewSize;
1224 }
1225 if (max_heap > min_new && min_heap_size() > min_new) {
1226 // Unless explicitly requested otherwise, make young gen
1227 // at least min_new, and at most preferred_max_new_size.
1228 if (FLAG_IS_DEFAULT(NewSize)) {
1229 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1230 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1231 if (PrintGCDetails && Verbose) {
1232 // Too early to use gclog_or_tty
1233 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1234 }
1235 }
1236 // Unless explicitly requested otherwise, size old gen
1237 // so it's NewRatio x of NewSize.
1238 if (FLAG_IS_DEFAULT(OldSize)) {
1239 if (max_heap > NewSize) {
1240 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1241 if (PrintGCDetails && Verbose) {
1242 // Too early to use gclog_or_tty
1243 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1244 }
1245 }
1246 }
1247 }
1248 }
1249 // Unless explicitly requested otherwise, definitely
1250 // promote all objects surviving "tenuring_default" scavenges.
1251 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1252 FLAG_IS_DEFAULT(SurvivorRatio)) {
1253 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1254 }
1255 // If we decided above (or user explicitly requested)
1256 // `promote all' (via MaxTenuringThreshold := 0),
1257 // prefer minuscule survivor spaces so as not to waste
1258 // space for (non-existent) survivors
1259 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1260 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1261 }
1262 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1263 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1264 // This is done in order to make ParNew+CMS configuration to work
1265 // with YoungPLABSize and OldPLABSize options.
1266 // See CR 6362902.
1267 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1268 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1269 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1270 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1271 // the value (either from the command line or ergonomics) of
1272 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1273 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1274 } else {
1275 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1276 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1277 // we'll let it to take precedence.
1278 jio_fprintf(defaultStream::error_stream(),
1279 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1280 " options are specified for the CMS collector."
1281 " CMSParPromoteBlocksToClaim will take precedence.\n");
1282 }
1283 }
1284 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1285 // OldPLAB sizing manually turned off: Use a larger default setting,
1286 // unless it was manually specified. This is because a too-low value
1287 // will slow down scavenges.
1288 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1289 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1290 }
1291 }
1292 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1293 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1294 // If either of the static initialization defaults have changed, note this
1295 // modification.
1296 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1297 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1298 }
1299 if (PrintGCDetails && Verbose) {
1300 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1301 MarkStackSize / K, MarkStackSizeMax / K);
1302 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1303 }
1304 }
1305 #endif // INCLUDE_ALL_GCS
1306
1307 void set_object_alignment() {
1308 // Object alignment.
1309 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1310 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1311 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1312 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1313 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1314 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1315
1316 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1317 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1318
1319 // Oop encoding heap max
1320 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1321
1322 #if INCLUDE_ALL_GCS
1323 // Set CMS global values
1324 CompactibleFreeListSpace::set_cms_values();
1325 #endif // INCLUDE_ALL_GCS
1326 }
1327
1328 bool verify_object_alignment() {
1329 // Object alignment.
1330 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1331 jio_fprintf(defaultStream::error_stream(),
1332 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1333 (int)ObjectAlignmentInBytes);
1334 return false;
1335 }
1336 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1337 jio_fprintf(defaultStream::error_stream(),
1338 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1339 (int)ObjectAlignmentInBytes, BytesPerLong);
1340 return false;
1341 }
1342 // It does not make sense to have big object alignment
1343 // since a space lost due to alignment will be greater
1344 // then a saved space from compressed oops.
1345 if ((int)ObjectAlignmentInBytes > 256) {
1346 jio_fprintf(defaultStream::error_stream(),
1347 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1348 (int)ObjectAlignmentInBytes);
1349 return false;
1350 }
1351 // In case page size is very small.
1352 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1353 jio_fprintf(defaultStream::error_stream(),
1354 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1355 (int)ObjectAlignmentInBytes, os::vm_page_size());
1356 return false;
1357 }
1358 return true;
1359 }
1360
1361 inline uintx max_heap_for_compressed_oops() {
1362 // Avoid sign flip.
1363 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) {
1364 return 0;
1365 }
1366 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size());
1367 NOT_LP64(ShouldNotReachHere(); return 0);
1368 }
1369
1370 bool Arguments::should_auto_select_low_pause_collector() {
1371 if (UseAutoGCSelectPolicy &&
1372 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1373 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1374 if (PrintGCDetails) {
1375 // Cannot use gclog_or_tty yet.
1376 tty->print_cr("Automatic selection of the low pause collector"
1377 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1378 }
1379 return true;
1380 }
1381 return false;
1382 }
1383
1384 void Arguments::set_use_compressed_oops() {
1385 #ifndef ZERO
1386 #ifdef _LP64
1387 // MaxHeapSize is not set up properly at this point, but
1388 // the only value that can override MaxHeapSize if we are
1389 // to use UseCompressedOops is InitialHeapSize.
1390 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1391
1392 if (max_heap_size <= max_heap_for_compressed_oops()) {
1393 #if !defined(COMPILER1) || defined(TIERED)
1394 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1395 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1396 }
1397 #endif
1398 #ifdef _WIN64
1399 if (UseLargePages && UseCompressedOops) {
1400 // Cannot allocate guard pages for implicit checks in indexed addressing
1401 // mode, when large pages are specified on windows.
1402 // This flag could be switched ON if narrow oop base address is set to 0,
1403 // see code in Universe::initialize_heap().
1404 Universe::set_narrow_oop_use_implicit_null_checks(false);
1405 }
1406 #endif // _WIN64
1407 } else {
1408 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1409 warning("Max heap size too large for Compressed Oops");
1410 FLAG_SET_DEFAULT(UseCompressedOops, false);
1411 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1412 }
1413 }
1414 #endif // _LP64
1415 #endif // ZERO
1416 }
1417
1418 void Arguments::set_ergonomics_flags() {
1419
1420 if (os::is_server_class_machine()) {
1421 // If no other collector is requested explicitly,
1422 // let the VM select the collector based on
1423 // machine class and automatic selection policy.
1424 if (!UseSerialGC &&
1425 !UseConcMarkSweepGC &&
1426 !UseG1GC &&
1427 !UseParNewGC &&
1428 FLAG_IS_DEFAULT(UseParallelGC)) {
1429 if (should_auto_select_low_pause_collector()) {
1430 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1431 } else {
1432 FLAG_SET_ERGO(bool, UseParallelGC, true);
1433 }
1434 }
1435 // Shared spaces work fine with other GCs but causes bytecode rewriting
1436 // to be disabled, which hurts interpreter performance and decreases
1437 // server performance. On server class machines, keep the default
1438 // off unless it is asked for. Future work: either add bytecode rewriting
1439 // at link time, or rewrite bytecodes in non-shared methods.
1440 if (!DumpSharedSpaces && !RequireSharedSpaces) {
1441 no_shared_spaces();
1442 }
1443 }
1444
1445 #ifndef ZERO
1446 #ifdef _LP64
1447 set_use_compressed_oops();
1448 // UseCompressedOops must be on for UseCompressedKlassPointers to be on.
1449 if (!UseCompressedOops) {
1450 if (UseCompressedKlassPointers) {
1451 warning("UseCompressedKlassPointers requires UseCompressedOops");
1452 }
1453 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1454 } else {
1455 // Turn on UseCompressedKlassPointers too
1456 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) {
1457 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true);
1458 }
1459 // Set the ClassMetaspaceSize to something that will not need to be
1460 // expanded, since it cannot be expanded.
1461 if (UseCompressedKlassPointers) {
1462 if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) {
1463 warning("Class metaspace size is too large for UseCompressedKlassPointers");
1464 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1465 } else if (FLAG_IS_DEFAULT(ClassMetaspaceSize)) {
1466 // 100,000 classes seems like a good size, so 100M assumes around 1K
1467 // per klass. The vtable and oopMap is embedded so we don't have a fixed
1468 // size per klass. Eventually, this will be parameterized because it
1469 // would also be useful to determine the optimal size of the
1470 // systemDictionary.
1471 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M);
1472 }
1473 }
1474 }
1475 // Also checks that certain machines are slower with compressed oops
1476 // in vm_version initialization code.
1477 #endif // _LP64
1478 #endif // !ZERO
1479 }
1480
1481 void Arguments::set_parallel_gc_flags() {
1482 assert(UseParallelGC || UseParallelOldGC, "Error");
1483 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1484 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1485 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1486 }
1487 FLAG_SET_DEFAULT(UseParallelGC, true);
1488
1489 // If no heap maximum was requested explicitly, use some reasonable fraction
1490 // of the physical memory, up to a maximum of 1GB.
1491 FLAG_SET_DEFAULT(ParallelGCThreads,
1492 Abstract_VM_Version::parallel_worker_threads());
1493 if (ParallelGCThreads == 0) {
1494 jio_fprintf(defaultStream::error_stream(),
1495 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1496 vm_exit(1);
1497 }
1498
1499
1500 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1501 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1502 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1503 // See CR 6362902 for details.
1504 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1505 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1506 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1507 }
1508 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1509 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1510 }
1511 }
1512
1513 if (UseParallelOldGC) {
1514 // Par compact uses lower default values since they are treated as
1515 // minimums. These are different defaults because of the different
1516 // interpretation and are not ergonomically set.
1517 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1518 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1519 }
1520 }
1521 }
1522
1523 void Arguments::set_g1_gc_flags() {
1524 assert(UseG1GC, "Error");
1525 #ifdef COMPILER1
1526 FastTLABRefill = false;
1527 #endif
1528 FLAG_SET_DEFAULT(ParallelGCThreads,
1529 Abstract_VM_Version::parallel_worker_threads());
1530 if (ParallelGCThreads == 0) {
1531 FLAG_SET_DEFAULT(ParallelGCThreads,
1532 Abstract_VM_Version::parallel_worker_threads());
1533 }
1534
1535 // MarkStackSize will be set (if it hasn't been set by the user)
1536 // when concurrent marking is initialized.
1537 // Its value will be based upon the number of parallel marking threads.
1538 // But we do set the maximum mark stack size here.
1539 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1540 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1541 }
1542
1543 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1544 // In G1, we want the default GC overhead goal to be higher than
1545 // say in PS. So we set it here to 10%. Otherwise the heap might
1546 // be expanded more aggressively than we would like it to. In
1547 // fact, even 10% seems to not be high enough in some cases
1548 // (especially small GC stress tests that the main thing they do
1549 // is allocation). We might consider increase it further.
1550 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1551 }
1552
1553 if (PrintGCDetails && Verbose) {
1554 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1555 MarkStackSize / K, MarkStackSizeMax / K);
1556 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1557 }
1558 }
1559
1560 void Arguments::set_heap_size() {
1561 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1562 // Deprecated flag
1563 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1564 }
1565
1566 const julong phys_mem =
1567 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1568 : (julong)MaxRAM;
1569
1570 // If the maximum heap size has not been set with -Xmx,
1571 // then set it as fraction of the size of physical memory,
1572 // respecting the maximum and minimum sizes of the heap.
1573 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1574 julong reasonable_max = phys_mem / MaxRAMFraction;
1575
1576 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1577 // Small physical memory, so use a minimum fraction of it for the heap
1578 reasonable_max = phys_mem / MinRAMFraction;
1579 } else {
1580 // Not-small physical memory, so require a heap at least
1581 // as large as MaxHeapSize
1582 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1583 }
1584 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1585 // Limit the heap size to ErgoHeapSizeLimit
1586 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1587 }
1588 if (UseCompressedOops) {
1589 // Limit the heap size to the maximum possible when using compressed oops
1590 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1591 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1592 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1593 // but it should be not less than default MaxHeapSize.
1594 max_coop_heap -= HeapBaseMinAddress;
1595 }
1596 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1597 }
1598 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1599
1600 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1601 // An initial heap size was specified on the command line,
1602 // so be sure that the maximum size is consistent. Done
1603 // after call to allocatable_physical_memory because that
1604 // method might reduce the allocation size.
1605 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1606 }
1607
1608 if (PrintGCDetails && Verbose) {
1609 // Cannot use gclog_or_tty yet.
1610 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1611 }
1612 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1613 }
1614
1615 // If the initial_heap_size has not been set with InitialHeapSize
1616 // or -Xms, then set it as fraction of the size of physical memory,
1617 // respecting the maximum and minimum sizes of the heap.
1618 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1619 julong reasonable_minimum = (julong)(OldSize + NewSize);
1620
1621 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1622
1623 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1624
1625 julong reasonable_initial = phys_mem / InitialRAMFraction;
1626
1627 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1628 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1629
1630 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1631
1632 if (PrintGCDetails && Verbose) {
1633 // Cannot use gclog_or_tty yet.
1634 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1635 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1636 }
1637 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1638 set_min_heap_size((uintx)reasonable_minimum);
1639 }
1640 }
1641
1642 // This must be called after ergonomics because we want bytecode rewriting
1643 // if the server compiler is used, or if UseSharedSpaces is disabled.
1644 void Arguments::set_bytecode_flags() {
1645 // Better not attempt to store into a read-only space.
1646 if (UseSharedSpaces) {
1647 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1648 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1649 }
1650
1651 if (!RewriteBytecodes) {
1652 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1653 }
1654 }
1655
1656 // Aggressive optimization flags -XX:+AggressiveOpts
1657 void Arguments::set_aggressive_opts_flags() {
1658 #ifdef COMPILER2
1659 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1660 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1661 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1662 }
1663 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1664 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1665 }
1666
1667 // Feed the cache size setting into the JDK
1668 char buffer[1024];
1669 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1670 add_property(buffer);
1671 }
1672 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1673 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1674 }
1675 #endif
1676
1677 if (AggressiveOpts) {
1678 // Sample flag setting code
1679 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1680 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1681 // }
1682 }
1683 }
1684
1685 //===========================================================================================================
1686 // Parsing of java.compiler property
1687
1688 void Arguments::process_java_compiler_argument(char* arg) {
1689 // For backwards compatibility, Djava.compiler=NONE or ""
1690 // causes us to switch to -Xint mode UNLESS -Xdebug
1691 // is also specified.
1692 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1693 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1694 }
1695 }
1696
1697 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1698 _sun_java_launcher = strdup(launcher);
1699 if (strcmp("gamma", _sun_java_launcher) == 0) {
1700 _created_by_gamma_launcher = true;
1701 }
1702 }
1703
1704 bool Arguments::created_by_java_launcher() {
1705 assert(_sun_java_launcher != NULL, "property must have value");
1706 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1707 }
1708
1709 bool Arguments::created_by_gamma_launcher() {
1710 return _created_by_gamma_launcher;
1711 }
1712
1713 //===========================================================================================================
1714 // Parsing of main arguments
1715
1716 bool Arguments::verify_interval(uintx val, uintx min,
1717 uintx max, const char* name) {
1718 // Returns true iff value is in the inclusive interval [min..max]
1719 // false, otherwise.
1720 if (val >= min && val <= max) {
1721 return true;
1722 }
1723 jio_fprintf(defaultStream::error_stream(),
1724 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1725 " and " UINTX_FORMAT "\n",
1726 name, val, min, max);
1727 return false;
1728 }
1729
1730 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1731 // Returns true if given value is at least specified min threshold
1732 // false, otherwise.
1733 if (val >= min ) {
1734 return true;
1735 }
1736 jio_fprintf(defaultStream::error_stream(),
1737 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1738 name, val, min);
1739 return false;
1740 }
1741
1742 bool Arguments::verify_percentage(uintx value, const char* name) {
1743 if (value <= 100) {
1744 return true;
1745 }
1746 jio_fprintf(defaultStream::error_stream(),
1747 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1748 name, value);
1749 return false;
1750 }
1751
1752 static bool verify_serial_gc_flags() {
1753 return (UseSerialGC &&
1754 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1755 UseParallelGC || UseParallelOldGC));
1756 }
1757
1758 // check if do gclog rotation
1759 // +UseGCLogFileRotation is a must,
1760 // no gc log rotation when log file not supplied or
1761 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1762 void check_gclog_consistency() {
1763 if (UseGCLogFileRotation) {
1764 if ((Arguments::gc_log_filename() == NULL) ||
1765 (NumberOfGCLogFiles == 0) ||
1766 (GCLogFileSize == 0)) {
1767 jio_fprintf(defaultStream::output_stream(),
1768 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1769 "where num_of_file > 0 and num_of_size > 0\n"
1770 "GC log rotation is turned off\n");
1771 UseGCLogFileRotation = false;
1772 }
1773 }
1774
1775 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1776 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1777 jio_fprintf(defaultStream::output_stream(),
1778 "GCLogFileSize changed to minimum 8K\n");
1779 }
1780 }
1781
1782 // Check consistency of GC selection
1783 bool Arguments::check_gc_consistency() {
1784 check_gclog_consistency();
1785 bool status = true;
1786 // Ensure that the user has not selected conflicting sets
1787 // of collectors. [Note: this check is merely a user convenience;
1788 // collectors over-ride each other so that only a non-conflicting
1789 // set is selected; however what the user gets is not what they
1790 // may have expected from the combination they asked for. It's
1791 // better to reduce user confusion by not allowing them to
1792 // select conflicting combinations.
1793 uint i = 0;
1794 if (UseSerialGC) i++;
1795 if (UseConcMarkSweepGC || UseParNewGC) i++;
1796 if (UseParallelGC || UseParallelOldGC) i++;
1797 if (UseG1GC) i++;
1798 if (i > 1) {
1799 jio_fprintf(defaultStream::error_stream(),
1800 "Conflicting collector combinations in option list; "
1801 "please refer to the release notes for the combinations "
1802 "allowed\n");
1803 status = false;
1804 }
1805
1806 return status;
1807 }
1808
1809 void Arguments::check_deprecated_gcs() {
1810 if (UseConcMarkSweepGC && !UseParNewGC) {
1811 warning("Using the DefNew young collector with the CMS collector is deprecated "
1812 "and will likely be removed in a future release");
1813 }
1814
1815 if (UseParNewGC && !UseConcMarkSweepGC) {
1816 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1817 // set up UseSerialGC properly, so that can't be used in the check here.
1818 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1819 "and will likely be removed in a future release");
1820 }
1821 }
1822
1823 void Arguments::check_deprecated_gc_flags() {
1824 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
1825 warning("Using MaxGCMinorPauseMillis as minor pause goal for adaptive size policy is deprecated"
1826 "and will be removed in future release");
1827 }
1828
1829 if (CMSIncrementalMode) {
1830 warning("Using incremental CMS is deprecated and will be removed in a future release");
1831 }
1832 }
1833
1834 // Check stack pages settings
1835 bool Arguments::check_stack_pages()
1836 {
1837 bool status = true;
1838 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1839 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1840 // greater stack shadow pages can't generate instruction to bang stack
1841 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1842 return status;
1843 }
1844
1845 // Check the consistency of vm_init_args
1846 bool Arguments::check_vm_args_consistency() {
1847 // Method for adding checks for flag consistency.
1848 // The intent is to warn the user of all possible conflicts,
1849 // before returning an error.
1850 // Note: Needs platform-dependent factoring.
1851 bool status = true;
1852
1853 #if ( (defined(COMPILER2) && defined(SPARC)))
1854 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1855 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1856 // x86. Normally, VM_Version_init must be called from init_globals in
1857 // init.cpp, which is called by the initial java thread *after* arguments
1858 // have been parsed. VM_Version_init gets called twice on sparc.
1859 extern void VM_Version_init();
1860 VM_Version_init();
1861 if (!VM_Version::has_v9()) {
1862 jio_fprintf(defaultStream::error_stream(),
1863 "V8 Machine detected, Server requires V9\n");
1864 status = false;
1865 }
1866 #endif /* COMPILER2 && SPARC */
1867
1868 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1869 // builds so the cost of stack banging can be measured.
1870 #if (defined(PRODUCT) && defined(SOLARIS))
1871 if (!UseBoundThreads && !UseStackBanging) {
1872 jio_fprintf(defaultStream::error_stream(),
1873 "-UseStackBanging conflicts with -UseBoundThreads\n");
1874
1875 status = false;
1876 }
1877 #endif
1878
1879 if (TLABRefillWasteFraction == 0) {
1880 jio_fprintf(defaultStream::error_stream(),
1881 "TLABRefillWasteFraction should be a denominator, "
1882 "not " SIZE_FORMAT "\n",
1883 TLABRefillWasteFraction);
1884 status = false;
1885 }
1886
1887 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1888 "AdaptiveSizePolicyWeight");
1889 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1890 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1891 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1892
1893 // Divide by bucket size to prevent a large size from causing rollover when
1894 // calculating amount of memory needed to be allocated for the String table.
1895 status = status && verify_interval(StringTableSize, defaultStringTableSize,
1896 (max_uintx / StringTable::bucket_size()), "StringTable size");
1897
1898 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1899 jio_fprintf(defaultStream::error_stream(),
1900 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1901 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1902 MinHeapFreeRatio, MaxHeapFreeRatio);
1903 status = false;
1904 }
1905 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1906 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1907
1908 // Min/MaxMetaspaceFreeRatio
1909 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
1910 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
1911
1912 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
1913 jio_fprintf(defaultStream::error_stream(),
1914 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
1915 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
1916 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
1917 MinMetaspaceFreeRatio,
1918 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
1919 MaxMetaspaceFreeRatio);
1920 status = false;
1921 }
1922
1923 // Trying to keep 100% free is not practical
1924 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
1925
1926 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1927 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1928 }
1929
1930 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1931 // Settings to encourage splitting.
1932 if (!FLAG_IS_CMDLINE(NewRatio)) {
1933 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
1934 }
1935 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1936 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1937 }
1938 }
1939
1940 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1941 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1942 if (GCTimeLimit == 100) {
1943 // Turn off gc-overhead-limit-exceeded checks
1944 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1945 }
1946
1947 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1948
1949 status = status && check_gc_consistency();
1950 status = status && check_stack_pages();
1951
1952 if (_has_alloc_profile) {
1953 if (UseParallelGC || UseParallelOldGC) {
1954 jio_fprintf(defaultStream::error_stream(),
1955 "error: invalid argument combination.\n"
1956 "Allocation profiling (-Xaprof) cannot be used together with "
1957 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1958 status = false;
1959 }
1960 if (UseConcMarkSweepGC) {
1961 jio_fprintf(defaultStream::error_stream(),
1962 "error: invalid argument combination.\n"
1963 "Allocation profiling (-Xaprof) cannot be used together with "
1964 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1965 status = false;
1966 }
1967 }
1968
1969 if (CMSIncrementalMode) {
1970 if (!UseConcMarkSweepGC) {
1971 jio_fprintf(defaultStream::error_stream(),
1972 "error: invalid argument combination.\n"
1973 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1974 "selected in order\nto use CMSIncrementalMode.\n");
1975 status = false;
1976 } else {
1977 status = status && verify_percentage(CMSIncrementalDutyCycle,
1978 "CMSIncrementalDutyCycle");
1979 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1980 "CMSIncrementalDutyCycleMin");
1981 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1982 "CMSIncrementalSafetyFactor");
1983 status = status && verify_percentage(CMSIncrementalOffset,
1984 "CMSIncrementalOffset");
1985 status = status && verify_percentage(CMSExpAvgFactor,
1986 "CMSExpAvgFactor");
1987 // If it was not set on the command line, set
1988 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1989 if (CMSInitiatingOccupancyFraction < 0) {
1990 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1991 }
1992 }
1993 }
1994
1995 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1996 // insists that we hold the requisite locks so that the iteration is
1997 // MT-safe. For the verification at start-up and shut-down, we don't
1998 // yet have a good way of acquiring and releasing these locks,
1999 // which are not visible at the CollectedHeap level. We want to
2000 // be able to acquire these locks and then do the iteration rather
2001 // than just disable the lock verification. This will be fixed under
2002 // bug 4788986.
2003 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2004 if (VerifyGCStartAt == 0) {
2005 warning("Heap verification at start-up disabled "
2006 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2007 VerifyGCStartAt = 1; // Disable verification at start-up
2008 }
2009 if (VerifyBeforeExit) {
2010 warning("Heap verification at shutdown disabled "
2011 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2012 VerifyBeforeExit = false; // Disable verification at shutdown
2013 }
2014 }
2015
2016 // Note: only executed in non-PRODUCT mode
2017 if (!UseAsyncConcMarkSweepGC &&
2018 (ExplicitGCInvokesConcurrent ||
2019 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2020 jio_fprintf(defaultStream::error_stream(),
2021 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2022 " with -UseAsyncConcMarkSweepGC");
2023 status = false;
2024 }
2025
2026 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2027
2028 #if INCLUDE_ALL_GCS
2029 if (UseG1GC) {
2030 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2031 "InitiatingHeapOccupancyPercent");
2032 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2033 "G1RefProcDrainInterval");
2034 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2035 "G1ConcMarkStepDurationMillis");
2036 }
2037 #endif // INCLUDE_ALL_GCS
2038
2039 status = status && verify_interval(RefDiscoveryPolicy,
2040 ReferenceProcessor::DiscoveryPolicyMin,
2041 ReferenceProcessor::DiscoveryPolicyMax,
2042 "RefDiscoveryPolicy");
2043
2044 // Limit the lower bound of this flag to 1 as it is used in a division
2045 // expression.
2046 status = status && verify_interval(TLABWasteTargetPercent,
2047 1, 100, "TLABWasteTargetPercent");
2048
2049 status = status && verify_object_alignment();
2050
2051 status = status && verify_min_value(ClassMetaspaceSize, 1*M,
2052 "ClassMetaspaceSize");
2053
2054 status = status && verify_interval(MarkStackSizeMax,
2055 1, (max_jint - 1), "MarkStackSizeMax");
2056
2057 #ifdef SPARC
2058 if (UseConcMarkSweepGC || UseG1GC) {
2059 // Issue a stern warning if the user has explicitly set
2060 // UseMemSetInBOT (it is known to cause issues), but allow
2061 // use for experimentation and debugging.
2062 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2063 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2064 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2065 " on sun4v; please understand that you are using at your own risk!");
2066 }
2067 }
2068 #endif // SPARC
2069
2070 if (PrintNMTStatistics) {
2071 #if INCLUDE_NMT
2072 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2073 #endif // INCLUDE_NMT
2074 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2075 PrintNMTStatistics = false;
2076 #if INCLUDE_NMT
2077 }
2078 #endif
2079 }
2080
2081 return status;
2082 }
2083
2084 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2085 const char* option_type) {
2086 if (ignore) return false;
2087
2088 const char* spacer = " ";
2089 if (option_type == NULL) {
2090 option_type = ++spacer; // Set both to the empty string.
2091 }
2092
2093 if (os::obsolete_option(option)) {
2094 jio_fprintf(defaultStream::error_stream(),
2095 "Obsolete %s%soption: %s\n", option_type, spacer,
2096 option->optionString);
2097 return false;
2098 } else {
2099 jio_fprintf(defaultStream::error_stream(),
2100 "Unrecognized %s%soption: %s\n", option_type, spacer,
2101 option->optionString);
2102 return true;
2103 }
2104 }
2105
2106 static const char* user_assertion_options[] = {
2107 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2108 };
2109
2110 static const char* system_assertion_options[] = {
2111 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2112 };
2113
2114 // Return true if any of the strings in null-terminated array 'names' matches.
2115 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2116 // the option must match exactly.
2117 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2118 bool tail_allowed) {
2119 for (/* empty */; *names != NULL; ++names) {
2120 if (match_option(option, *names, tail)) {
2121 if (**tail == '\0' || tail_allowed && **tail == ':') {
2122 return true;
2123 }
2124 }
2125 }
2126 return false;
2127 }
2128
2129 bool Arguments::parse_uintx(const char* value,
2130 uintx* uintx_arg,
2131 uintx min_size) {
2132
2133 // Check the sign first since atomull() parses only unsigned values.
2134 bool value_is_positive = !(*value == '-');
2135
2136 if (value_is_positive) {
2137 julong n;
2138 bool good_return = atomull(value, &n);
2139 if (good_return) {
2140 bool above_minimum = n >= min_size;
2141 bool value_is_too_large = n > max_uintx;
2142
2143 if (above_minimum && !value_is_too_large) {
2144 *uintx_arg = n;
2145 return true;
2146 }
2147 }
2148 }
2149 return false;
2150 }
2151
2152 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2153 julong* long_arg,
2154 julong min_size) {
2155 if (!atomull(s, long_arg)) return arg_unreadable;
2156 return check_memory_size(*long_arg, min_size);
2157 }
2158
2159 // Parse JavaVMInitArgs structure
2160
2161 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2162 // For components of the system classpath.
2163 SysClassPath scp(Arguments::get_sysclasspath());
2164 bool scp_assembly_required = false;
2165
2166 // Save default settings for some mode flags
2167 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2168 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2169 Arguments::_ClipInlining = ClipInlining;
2170 Arguments::_BackgroundCompilation = BackgroundCompilation;
2171
2172 // Setup flags for mixed which is the default
2173 set_mode_flags(_mixed);
2174
2175 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2176 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2177 if (result != JNI_OK) {
2178 return result;
2179 }
2180
2181 // Parse JavaVMInitArgs structure passed in
2182 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2183 if (result != JNI_OK) {
2184 return result;
2185 }
2186
2187 if (AggressiveOpts) {
2188 // Insert alt-rt.jar between user-specified bootclasspath
2189 // prefix and the default bootclasspath. os::set_boot_path()
2190 // uses meta_index_dir as the default bootclasspath directory.
2191 const char* altclasses_jar = "alt-rt.jar";
2192 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2193 strlen(altclasses_jar);
2194 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2195 strcpy(altclasses_path, get_meta_index_dir());
2196 strcat(altclasses_path, altclasses_jar);
2197 scp.add_suffix_to_prefix(altclasses_path);
2198 scp_assembly_required = true;
2199 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2200 }
2201
2202 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2203 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2204 if (result != JNI_OK) {
2205 return result;
2206 }
2207
2208 // Do final processing now that all arguments have been parsed
2209 result = finalize_vm_init_args(&scp, scp_assembly_required);
2210 if (result != JNI_OK) {
2211 return result;
2212 }
2213
2214 return JNI_OK;
2215 }
2216
2217 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2218 SysClassPath* scp_p,
2219 bool* scp_assembly_required_p,
2220 FlagValueOrigin origin) {
2221 // Remaining part of option string
2222 const char* tail;
2223
2224 // iterate over arguments
2225 for (int index = 0; index < args->nOptions; index++) {
2226 bool is_absolute_path = false; // for -agentpath vs -agentlib
2227
2228 const JavaVMOption* option = args->options + index;
2229
2230 if (!match_option(option, "-Djava.class.path", &tail) &&
2231 !match_option(option, "-Dsun.java.command", &tail) &&
2232 !match_option(option, "-Dsun.java.launcher", &tail)) {
2233
2234 // add all jvm options to the jvm_args string. This string
2235 // is used later to set the java.vm.args PerfData string constant.
2236 // the -Djava.class.path and the -Dsun.java.command options are
2237 // omitted from jvm_args string as each have their own PerfData
2238 // string constant object.
2239 build_jvm_args(option->optionString);
2240 }
2241
2242 // -verbose:[class/gc/jni]
2243 if (match_option(option, "-verbose", &tail)) {
2244 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2245 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2246 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2247 } else if (!strcmp(tail, ":gc")) {
2248 FLAG_SET_CMDLINE(bool, PrintGC, true);
2249 } else if (!strcmp(tail, ":jni")) {
2250 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2251 }
2252 // -da / -ea / -disableassertions / -enableassertions
2253 // These accept an optional class/package name separated by a colon, e.g.,
2254 // -da:java.lang.Thread.
2255 } else if (match_option(option, user_assertion_options, &tail, true)) {
2256 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2257 if (*tail == '\0') {
2258 JavaAssertions::setUserClassDefault(enable);
2259 } else {
2260 assert(*tail == ':', "bogus match by match_option()");
2261 JavaAssertions::addOption(tail + 1, enable);
2262 }
2263 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2264 } else if (match_option(option, system_assertion_options, &tail, false)) {
2265 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2266 JavaAssertions::setSystemClassDefault(enable);
2267 // -bootclasspath:
2268 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2269 scp_p->reset_path(tail);
2270 *scp_assembly_required_p = true;
2271 // -bootclasspath/a:
2272 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2273 scp_p->add_suffix(tail);
2274 *scp_assembly_required_p = true;
2275 // -bootclasspath/p:
2276 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2277 scp_p->add_prefix(tail);
2278 *scp_assembly_required_p = true;
2279 // -Xrun
2280 } else if (match_option(option, "-Xrun", &tail)) {
2281 if (tail != NULL) {
2282 const char* pos = strchr(tail, ':');
2283 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2284 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2285 name[len] = '\0';
2286
2287 char *options = NULL;
2288 if(pos != NULL) {
2289 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2290 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2291 }
2292 #if !INCLUDE_JVMTI
2293 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2294 jio_fprintf(defaultStream::error_stream(),
2295 "Profiling and debugging agents are not supported in this VM\n");
2296 return JNI_ERR;
2297 }
2298 #endif // !INCLUDE_JVMTI
2299 add_init_library(name, options);
2300 }
2301 // -agentlib and -agentpath
2302 } else if (match_option(option, "-agentlib:", &tail) ||
2303 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2304 if(tail != NULL) {
2305 const char* pos = strchr(tail, '=');
2306 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2307 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2308 name[len] = '\0';
2309
2310 char *options = NULL;
2311 if(pos != NULL) {
2312 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2313 }
2314 #if !INCLUDE_JVMTI
2315 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2316 jio_fprintf(defaultStream::error_stream(),
2317 "Profiling and debugging agents are not supported in this VM\n");
2318 return JNI_ERR;
2319 }
2320 #endif // !INCLUDE_JVMTI
2321 add_init_agent(name, options, is_absolute_path);
2322 }
2323 // -javaagent
2324 } else if (match_option(option, "-javaagent:", &tail)) {
2325 #if !INCLUDE_JVMTI
2326 jio_fprintf(defaultStream::error_stream(),
2327 "Instrumentation agents are not supported in this VM\n");
2328 return JNI_ERR;
2329 #else
2330 if(tail != NULL) {
2331 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2332 add_init_agent("instrument", options, false);
2333 }
2334 #endif // !INCLUDE_JVMTI
2335 // -Xnoclassgc
2336 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2337 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2338 // -Xincgc: i-CMS
2339 } else if (match_option(option, "-Xincgc", &tail)) {
2340 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2341 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2342 // -Xnoincgc: no i-CMS
2343 } else if (match_option(option, "-Xnoincgc", &tail)) {
2344 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2345 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2346 // -Xconcgc
2347 } else if (match_option(option, "-Xconcgc", &tail)) {
2348 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2349 // -Xnoconcgc
2350 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2351 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2352 // -Xbatch
2353 } else if (match_option(option, "-Xbatch", &tail)) {
2354 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2355 // -Xmn for compatibility with other JVM vendors
2356 } else if (match_option(option, "-Xmn", &tail)) {
2357 julong long_initial_eden_size = 0;
2358 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2359 if (errcode != arg_in_range) {
2360 jio_fprintf(defaultStream::error_stream(),
2361 "Invalid initial eden size: %s\n", option->optionString);
2362 describe_range_error(errcode);
2363 return JNI_EINVAL;
2364 }
2365 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2366 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2367 // -Xms
2368 } else if (match_option(option, "-Xms", &tail)) {
2369 julong long_initial_heap_size = 0;
2370 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2371 if (errcode != arg_in_range) {
2372 jio_fprintf(defaultStream::error_stream(),
2373 "Invalid initial heap size: %s\n", option->optionString);
2374 describe_range_error(errcode);
2375 return JNI_EINVAL;
2376 }
2377 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2378 // Currently the minimum size and the initial heap sizes are the same.
2379 set_min_heap_size(InitialHeapSize);
2380 // -Xmx
2381 } else if (match_option(option, "-Xmx", &tail)) {
2382 julong long_max_heap_size = 0;
2383 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2384 if (errcode != arg_in_range) {
2385 jio_fprintf(defaultStream::error_stream(),
2386 "Invalid maximum heap size: %s\n", option->optionString);
2387 describe_range_error(errcode);
2388 return JNI_EINVAL;
2389 }
2390 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2391 // Xmaxf
2392 } else if (match_option(option, "-Xmaxf", &tail)) {
2393 int maxf = (int)(atof(tail) * 100);
2394 if (maxf < 0 || maxf > 100) {
2395 jio_fprintf(defaultStream::error_stream(),
2396 "Bad max heap free percentage size: %s\n",
2397 option->optionString);
2398 return JNI_EINVAL;
2399 } else {
2400 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2401 }
2402 // Xminf
2403 } else if (match_option(option, "-Xminf", &tail)) {
2404 int minf = (int)(atof(tail) * 100);
2405 if (minf < 0 || minf > 100) {
2406 jio_fprintf(defaultStream::error_stream(),
2407 "Bad min heap free percentage size: %s\n",
2408 option->optionString);
2409 return JNI_EINVAL;
2410 } else {
2411 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2412 }
2413 // -Xss
2414 } else if (match_option(option, "-Xss", &tail)) {
2415 julong long_ThreadStackSize = 0;
2416 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2417 if (errcode != arg_in_range) {
2418 jio_fprintf(defaultStream::error_stream(),
2419 "Invalid thread stack size: %s\n", option->optionString);
2420 describe_range_error(errcode);
2421 return JNI_EINVAL;
2422 }
2423 // Internally track ThreadStackSize in units of 1024 bytes.
2424 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2425 round_to((int)long_ThreadStackSize, K) / K);
2426 // -Xoss
2427 } else if (match_option(option, "-Xoss", &tail)) {
2428 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2429 // -Xmaxjitcodesize
2430 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2431 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2432 julong long_ReservedCodeCacheSize = 0;
2433 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2434 (size_t)InitialCodeCacheSize);
2435 if (errcode != arg_in_range) {
2436 jio_fprintf(defaultStream::error_stream(),
2437 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2438 option->optionString, InitialCodeCacheSize/K);
2439 describe_range_error(errcode);
2440 return JNI_EINVAL;
2441 }
2442 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2443 // -green
2444 } else if (match_option(option, "-green", &tail)) {
2445 jio_fprintf(defaultStream::error_stream(),
2446 "Green threads support not available\n");
2447 return JNI_EINVAL;
2448 // -native
2449 } else if (match_option(option, "-native", &tail)) {
2450 // HotSpot always uses native threads, ignore silently for compatibility
2451 // -Xsqnopause
2452 } else if (match_option(option, "-Xsqnopause", &tail)) {
2453 // EVM option, ignore silently for compatibility
2454 // -Xrs
2455 } else if (match_option(option, "-Xrs", &tail)) {
2456 // Classic/EVM option, new functionality
2457 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2458 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2459 // change default internal VM signals used - lower case for back compat
2460 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2461 // -Xoptimize
2462 } else if (match_option(option, "-Xoptimize", &tail)) {
2463 // EVM option, ignore silently for compatibility
2464 // -Xprof
2465 } else if (match_option(option, "-Xprof", &tail)) {
2466 #if INCLUDE_FPROF
2467 _has_profile = true;
2468 #else // INCLUDE_FPROF
2469 jio_fprintf(defaultStream::error_stream(),
2470 "Flat profiling is not supported in this VM.\n");
2471 return JNI_ERR;
2472 #endif // INCLUDE_FPROF
2473 // -Xaprof
2474 } else if (match_option(option, "-Xaprof", &tail)) {
2475 _has_alloc_profile = true;
2476 // -Xconcurrentio
2477 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2478 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2479 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2480 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2481 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2482 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2483
2484 // -Xinternalversion
2485 } else if (match_option(option, "-Xinternalversion", &tail)) {
2486 jio_fprintf(defaultStream::output_stream(), "%s\n",
2487 VM_Version::internal_vm_info_string());
2488 vm_exit(0);
2489 #ifndef PRODUCT
2490 // -Xprintflags
2491 } else if (match_option(option, "-Xprintflags", &tail)) {
2492 CommandLineFlags::printFlags(tty, false);
2493 vm_exit(0);
2494 #endif
2495 // -D
2496 } else if (match_option(option, "-D", &tail)) {
2497 if (!add_property(tail)) {
2498 return JNI_ENOMEM;
2499 }
2500 // Out of the box management support
2501 if (match_option(option, "-Dcom.sun.management", &tail)) {
2502 #if INCLUDE_MANAGEMENT
2503 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2504 #else
2505 jio_fprintf(defaultStream::output_stream(),
2506 "-Dcom.sun.management is not supported in this VM.\n");
2507 return JNI_ERR;
2508 #endif
2509 }
2510 // -Xint
2511 } else if (match_option(option, "-Xint", &tail)) {
2512 set_mode_flags(_int);
2513 // -Xmixed
2514 } else if (match_option(option, "-Xmixed", &tail)) {
2515 set_mode_flags(_mixed);
2516 // -Xcomp
2517 } else if (match_option(option, "-Xcomp", &tail)) {
2518 // for testing the compiler; turn off all flags that inhibit compilation
2519 set_mode_flags(_comp);
2520 // -Xshare:dump
2521 } else if (match_option(option, "-Xshare:dump", &tail)) {
2522 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2523 set_mode_flags(_int); // Prevent compilation, which creates objects
2524 // -Xshare:on
2525 } else if (match_option(option, "-Xshare:on", &tail)) {
2526 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2527 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2528 // -Xshare:auto
2529 } else if (match_option(option, "-Xshare:auto", &tail)) {
2530 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2531 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2532 // -Xshare:off
2533 } else if (match_option(option, "-Xshare:off", &tail)) {
2534 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2535 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2536 // -Xverify
2537 } else if (match_option(option, "-Xverify", &tail)) {
2538 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2539 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2540 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2541 } else if (strcmp(tail, ":remote") == 0) {
2542 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2543 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2544 } else if (strcmp(tail, ":none") == 0) {
2545 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2546 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2547 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2548 return JNI_EINVAL;
2549 }
2550 // -Xdebug
2551 } else if (match_option(option, "-Xdebug", &tail)) {
2552 // note this flag has been used, then ignore
2553 set_xdebug_mode(true);
2554 // -Xnoagent
2555 } else if (match_option(option, "-Xnoagent", &tail)) {
2556 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2557 } else if (match_option(option, "-Xboundthreads", &tail)) {
2558 // Bind user level threads to kernel threads (Solaris only)
2559 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2560 } else if (match_option(option, "-Xloggc:", &tail)) {
2561 // Redirect GC output to the file. -Xloggc:<filename>
2562 // ostream_init_log(), when called will use this filename
2563 // to initialize a fileStream.
2564 _gc_log_filename = strdup(tail);
2565 FLAG_SET_CMDLINE(bool, PrintGC, true);
2566 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2567
2568 // JNI hooks
2569 } else if (match_option(option, "-Xcheck", &tail)) {
2570 if (!strcmp(tail, ":jni")) {
2571 #if !INCLUDE_JNI_CHECK
2572 warning("JNI CHECKING is not supported in this VM");
2573 #else
2574 CheckJNICalls = true;
2575 #endif // INCLUDE_JNI_CHECK
2576 } else if (is_bad_option(option, args->ignoreUnrecognized,
2577 "check")) {
2578 return JNI_EINVAL;
2579 }
2580 } else if (match_option(option, "vfprintf", &tail)) {
2581 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2582 } else if (match_option(option, "exit", &tail)) {
2583 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2584 } else if (match_option(option, "abort", &tail)) {
2585 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2586 // -XX:+AggressiveHeap
2587 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2588
2589 // This option inspects the machine and attempts to set various
2590 // parameters to be optimal for long-running, memory allocation
2591 // intensive jobs. It is intended for machines with large
2592 // amounts of cpu and memory.
2593
2594 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2595 // VM, but we may not be able to represent the total physical memory
2596 // available (like having 8gb of memory on a box but using a 32bit VM).
2597 // Thus, we need to make sure we're using a julong for intermediate
2598 // calculations.
2599 julong initHeapSize;
2600 julong total_memory = os::physical_memory();
2601
2602 if (total_memory < (julong)256*M) {
2603 jio_fprintf(defaultStream::error_stream(),
2604 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2605 vm_exit(1);
2606 }
2607
2608 // The heap size is half of available memory, or (at most)
2609 // all of possible memory less 160mb (leaving room for the OS
2610 // when using ISM). This is the maximum; because adaptive sizing
2611 // is turned on below, the actual space used may be smaller.
2612
2613 initHeapSize = MIN2(total_memory / (julong)2,
2614 total_memory - (julong)160*M);
2615
2616 // Make sure that if we have a lot of memory we cap the 32 bit
2617 // process space. The 64bit VM version of this function is a nop.
2618 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2619
2620 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2621 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2622 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2623 // Currently the minimum size and the initial heap sizes are the same.
2624 set_min_heap_size(initHeapSize);
2625 }
2626 if (FLAG_IS_DEFAULT(NewSize)) {
2627 // Make the young generation 3/8ths of the total heap.
2628 FLAG_SET_CMDLINE(uintx, NewSize,
2629 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2630 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2631 }
2632
2633 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2634 FLAG_SET_DEFAULT(UseLargePages, true);
2635 #endif
2636
2637 // Increase some data structure sizes for efficiency
2638 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2639 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2640 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2641
2642 // See the OldPLABSize comment below, but replace 'after promotion'
2643 // with 'after copying'. YoungPLABSize is the size of the survivor
2644 // space per-gc-thread buffers. The default is 4kw.
2645 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2646
2647 // OldPLABSize is the size of the buffers in the old gen that
2648 // UseParallelGC uses to promote live data that doesn't fit in the
2649 // survivor spaces. At any given time, there's one for each gc thread.
2650 // The default size is 1kw. These buffers are rarely used, since the
2651 // survivor spaces are usually big enough. For specjbb, however, there
2652 // are occasions when there's lots of live data in the young gen
2653 // and we end up promoting some of it. We don't have a definite
2654 // explanation for why bumping OldPLABSize helps, but the theory
2655 // is that a bigger PLAB results in retaining something like the
2656 // original allocation order after promotion, which improves mutator
2657 // locality. A minor effect may be that larger PLABs reduce the
2658 // number of PLAB allocation events during gc. The value of 8kw
2659 // was arrived at by experimenting with specjbb.
2660 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2661
2662 // Enable parallel GC and adaptive generation sizing
2663 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2664 FLAG_SET_DEFAULT(ParallelGCThreads,
2665 Abstract_VM_Version::parallel_worker_threads());
2666
2667 // Encourage steady state memory management
2668 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2669
2670 // This appears to improve mutator locality
2671 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2672
2673 // Get around early Solaris scheduling bug
2674 // (affinity vs other jobs on system)
2675 // but disallow DR and offlining (5008695).
2676 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2677
2678 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2679 // The last option must always win.
2680 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2681 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2682 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2683 // The last option must always win.
2684 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2685 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2686 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2687 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2688 jio_fprintf(defaultStream::error_stream(),
2689 "Please use CMSClassUnloadingEnabled in place of "
2690 "CMSPermGenSweepingEnabled in the future\n");
2691 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2692 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2693 jio_fprintf(defaultStream::error_stream(),
2694 "Please use -XX:+UseGCOverheadLimit in place of "
2695 "-XX:+UseGCTimeLimit in the future\n");
2696 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2697 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2698 jio_fprintf(defaultStream::error_stream(),
2699 "Please use -XX:-UseGCOverheadLimit in place of "
2700 "-XX:-UseGCTimeLimit in the future\n");
2701 // The TLE options are for compatibility with 1.3 and will be
2702 // removed without notice in a future release. These options
2703 // are not to be documented.
2704 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2705 // No longer used.
2706 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2707 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2708 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2709 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2710 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2711 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2712 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2713 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2714 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2715 // No longer used.
2716 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2717 julong long_tlab_size = 0;
2718 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2719 if (errcode != arg_in_range) {
2720 jio_fprintf(defaultStream::error_stream(),
2721 "Invalid TLAB size: %s\n", option->optionString);
2722 describe_range_error(errcode);
2723 return JNI_EINVAL;
2724 }
2725 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2726 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2727 // No longer used.
2728 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2729 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2730 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2731 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2732 SOLARIS_ONLY(
2733 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2734 warning("-XX:+UsePermISM is obsolete.");
2735 FLAG_SET_CMDLINE(bool, UseISM, true);
2736 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2737 FLAG_SET_CMDLINE(bool, UseISM, false);
2738 )
2739 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2740 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2741 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2742 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2743 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2744 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2745 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2746 #if defined(DTRACE_ENABLED)
2747 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2748 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2749 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2750 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2751 #else // defined(DTRACE_ENABLED)
2752 jio_fprintf(defaultStream::error_stream(),
2753 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2754 return JNI_EINVAL;
2755 #endif // defined(DTRACE_ENABLED)
2756 #ifdef ASSERT
2757 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2758 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2759 // disable scavenge before parallel mark-compact
2760 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2761 #endif
2762 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2763 julong cms_blocks_to_claim = (julong)atol(tail);
2764 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2765 jio_fprintf(defaultStream::error_stream(),
2766 "Please use -XX:OldPLABSize in place of "
2767 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2768 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2769 julong cms_blocks_to_claim = (julong)atol(tail);
2770 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2771 jio_fprintf(defaultStream::error_stream(),
2772 "Please use -XX:OldPLABSize in place of "
2773 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2774 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2775 julong old_plab_size = 0;
2776 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2777 if (errcode != arg_in_range) {
2778 jio_fprintf(defaultStream::error_stream(),
2779 "Invalid old PLAB size: %s\n", option->optionString);
2780 describe_range_error(errcode);
2781 return JNI_EINVAL;
2782 }
2783 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2784 jio_fprintf(defaultStream::error_stream(),
2785 "Please use -XX:OldPLABSize in place of "
2786 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2787 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2788 julong young_plab_size = 0;
2789 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2790 if (errcode != arg_in_range) {
2791 jio_fprintf(defaultStream::error_stream(),
2792 "Invalid young PLAB size: %s\n", option->optionString);
2793 describe_range_error(errcode);
2794 return JNI_EINVAL;
2795 }
2796 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2797 jio_fprintf(defaultStream::error_stream(),
2798 "Please use -XX:YoungPLABSize in place of "
2799 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2800 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2801 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2802 julong stack_size = 0;
2803 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2804 if (errcode != arg_in_range) {
2805 jio_fprintf(defaultStream::error_stream(),
2806 "Invalid mark stack size: %s\n", option->optionString);
2807 describe_range_error(errcode);
2808 return JNI_EINVAL;
2809 }
2810 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2811 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2812 julong max_stack_size = 0;
2813 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2814 if (errcode != arg_in_range) {
2815 jio_fprintf(defaultStream::error_stream(),
2816 "Invalid maximum mark stack size: %s\n",
2817 option->optionString);
2818 describe_range_error(errcode);
2819 return JNI_EINVAL;
2820 }
2821 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2822 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2823 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2824 uintx conc_threads = 0;
2825 if (!parse_uintx(tail, &conc_threads, 1)) {
2826 jio_fprintf(defaultStream::error_stream(),
2827 "Invalid concurrent threads: %s\n", option->optionString);
2828 return JNI_EINVAL;
2829 }
2830 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2831 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
2832 julong max_direct_memory_size = 0;
2833 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
2834 if (errcode != arg_in_range) {
2835 jio_fprintf(defaultStream::error_stream(),
2836 "Invalid maximum direct memory size: %s\n",
2837 option->optionString);
2838 describe_range_error(errcode);
2839 return JNI_EINVAL;
2840 }
2841 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
2842 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
2843 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
2844 // away and will cause VM initialization failures!
2845 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
2846 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
2847 #if !INCLUDE_MANAGEMENT
2848 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
2849 jio_fprintf(defaultStream::error_stream(),
2850 "ManagementServer is not supported in this VM.\n");
2851 return JNI_ERR;
2852 #endif // INCLUDE_MANAGEMENT
2853 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2854 // Skip -XX:Flags= since that case has already been handled
2855 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2856 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2857 return JNI_EINVAL;
2858 }
2859 }
2860 // Unknown option
2861 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2862 return JNI_ERR;
2863 }
2864 }
2865
2866 // Change the default value for flags which have different default values
2867 // when working with older JDKs.
2868 #ifdef LINUX
2869 if (JDK_Version::current().compare_major(6) <= 0 &&
2870 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2871 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2872 }
2873 #endif // LINUX
2874 return JNI_OK;
2875 }
2876
2877 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2878 // This must be done after all -D arguments have been processed.
2879 scp_p->expand_endorsed();
2880
2881 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2882 // Assemble the bootclasspath elements into the final path.
2883 Arguments::set_sysclasspath(scp_p->combined_path());
2884 }
2885
2886 // This must be done after all arguments have been processed.
2887 // java_compiler() true means set to "NONE" or empty.
2888 if (java_compiler() && !xdebug_mode()) {
2889 // For backwards compatibility, we switch to interpreted mode if
2890 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2891 // not specified.
2892 set_mode_flags(_int);
2893 }
2894 if (CompileThreshold == 0) {
2895 set_mode_flags(_int);
2896 }
2897
2898 #ifndef COMPILER2
2899 // Don't degrade server performance for footprint
2900 if (FLAG_IS_DEFAULT(UseLargePages) &&
2901 MaxHeapSize < LargePageHeapSizeThreshold) {
2902 // No need for large granularity pages w/small heaps.
2903 // Note that large pages are enabled/disabled for both the
2904 // Java heap and the code cache.
2905 FLAG_SET_DEFAULT(UseLargePages, false);
2906 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2907 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2908 }
2909
2910 // Tiered compilation is undefined with C1.
2911 TieredCompilation = false;
2912 #else
2913 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2914 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2915 }
2916 #endif
2917
2918 // If we are running in a headless jre, force java.awt.headless property
2919 // to be true unless the property has already been set.
2920 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2921 if (os::is_headless_jre()) {
2922 const char* headless = Arguments::get_property("java.awt.headless");
2923 if (headless == NULL) {
2924 char envbuffer[128];
2925 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2926 if (!add_property("java.awt.headless=true")) {
2927 return JNI_ENOMEM;
2928 }
2929 } else {
2930 char buffer[256];
2931 strcpy(buffer, "java.awt.headless=");
2932 strcat(buffer, envbuffer);
2933 if (!add_property(buffer)) {
2934 return JNI_ENOMEM;
2935 }
2936 }
2937 }
2938 }
2939
2940 if (!check_vm_args_consistency()) {
2941 return JNI_ERR;
2942 }
2943
2944 return JNI_OK;
2945 }
2946
2947 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2948 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2949 scp_assembly_required_p);
2950 }
2951
2952 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2953 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2954 scp_assembly_required_p);
2955 }
2956
2957 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2958 const int N_MAX_OPTIONS = 64;
2959 const int OPTION_BUFFER_SIZE = 1024;
2960 char buffer[OPTION_BUFFER_SIZE];
2961
2962 // The variable will be ignored if it exceeds the length of the buffer.
2963 // Don't check this variable if user has special privileges
2964 // (e.g. unix su command).
2965 if (os::getenv(name, buffer, sizeof(buffer)) &&
2966 !os::have_special_privileges()) {
2967 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2968 jio_fprintf(defaultStream::error_stream(),
2969 "Picked up %s: %s\n", name, buffer);
2970 char* rd = buffer; // pointer to the input string (rd)
2971 int i;
2972 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2973 while (isspace(*rd)) rd++; // skip whitespace
2974 if (*rd == 0) break; // we re done when the input string is read completely
2975
2976 // The output, option string, overwrites the input string.
2977 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2978 // input string (rd).
2979 char* wrt = rd;
2980
2981 options[i++].optionString = wrt; // Fill in option
2982 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2983 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2984 int quote = *rd; // matching quote to look for
2985 rd++; // don't copy open quote
2986 while (*rd != quote) { // include everything (even spaces) up until quote
2987 if (*rd == 0) { // string termination means unmatched string
2988 jio_fprintf(defaultStream::error_stream(),
2989 "Unmatched quote in %s\n", name);
2990 return JNI_ERR;
2991 }
2992 *wrt++ = *rd++; // copy to option string
2993 }
2994 rd++; // don't copy close quote
2995 } else {
2996 *wrt++ = *rd++; // copy to option string
2997 }
2998 }
2999 // Need to check if we're done before writing a NULL,
3000 // because the write could be to the byte that rd is pointing to.
3001 if (*rd++ == 0) {
3002 *wrt = 0;
3003 break;
3004 }
3005 *wrt = 0; // Zero terminate option
3006 }
3007 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3008 JavaVMInitArgs vm_args;
3009 vm_args.version = JNI_VERSION_1_2;
3010 vm_args.options = options;
3011 vm_args.nOptions = i;
3012 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3013
3014 if (PrintVMOptions) {
3015 const char* tail;
3016 for (int i = 0; i < vm_args.nOptions; i++) {
3017 const JavaVMOption *option = vm_args.options + i;
3018 if (match_option(option, "-XX:", &tail)) {
3019 logOption(tail);
3020 }
3021 }
3022 }
3023
3024 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
3025 }
3026 return JNI_OK;
3027 }
3028
3029 void Arguments::set_shared_spaces_flags() {
3030 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
3031 const bool might_share = must_share || UseSharedSpaces;
3032
3033 // CompressedOops cannot be used with CDS. The offsets of oopmaps and
3034 // static fields are incorrect in the archive. With some more clever
3035 // initialization, this restriction can probably be lifted.
3036 // ??? UseLargePages might be okay now
3037 const bool cannot_share = UseCompressedOops ||
3038 (UseLargePages && FLAG_IS_CMDLINE(UseLargePages));
3039 if (cannot_share) {
3040 if (must_share) {
3041 warning("disabling large pages %s"
3042 "because of %s", "" LP64_ONLY("and compressed oops "),
3043 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
3044 FLAG_SET_CMDLINE(bool, UseLargePages, false);
3045 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
3046 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false));
3047 } else {
3048 // Prefer compressed oops and large pages to class data sharing
3049 if (UseSharedSpaces && Verbose) {
3050 warning("turning off use of shared archive because of large pages%s",
3051 "" LP64_ONLY(" and/or compressed oops"));
3052 }
3053 no_shared_spaces();
3054 }
3055 } else if (UseLargePages && might_share) {
3056 // Disable large pages to allow shared spaces. This is sub-optimal, since
3057 // there may not even be a shared archive to use.
3058 FLAG_SET_DEFAULT(UseLargePages, false);
3059 }
3060
3061 if (DumpSharedSpaces) {
3062 if (RequireSharedSpaces) {
3063 warning("cannot dump shared archive while using shared archive");
3064 }
3065 UseSharedSpaces = false;
3066 }
3067 }
3068
3069 // Disable options not supported in this release, with a warning if they
3070 // were explicitly requested on the command-line
3071 #define UNSUPPORTED_OPTION(opt, description) \
3072 do { \
3073 if (opt) { \
3074 if (FLAG_IS_CMDLINE(opt)) { \
3075 warning(description " is disabled in this release."); \
3076 } \
3077 FLAG_SET_DEFAULT(opt, false); \
3078 } \
3079 } while(0)
3080
3081
3082 #define UNSUPPORTED_GC_OPTION(gc) \
3083 do { \
3084 if (gc) { \
3085 if (FLAG_IS_CMDLINE(gc)) { \
3086 warning(#gc " is not supported in this VM. Using Serial GC."); \
3087 } \
3088 FLAG_SET_DEFAULT(gc, false); \
3089 } \
3090 } while(0)
3091
3092 static void force_serial_gc() {
3093 FLAG_SET_DEFAULT(UseSerialGC, true);
3094 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3095 UNSUPPORTED_GC_OPTION(UseG1GC);
3096 UNSUPPORTED_GC_OPTION(UseParallelGC);
3097 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3098 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3099 UNSUPPORTED_GC_OPTION(UseParNewGC);
3100 }
3101
3102 // Parse entry point called from JNI_CreateJavaVM
3103
3104 jint Arguments::parse(const JavaVMInitArgs* args) {
3105
3106 // Sharing support
3107 // Construct the path to the archive
3108 char jvm_path[JVM_MAXPATHLEN];
3109 os::jvm_path(jvm_path, sizeof(jvm_path));
3110 char *end = strrchr(jvm_path, *os::file_separator());
3111 if (end != NULL) *end = '\0';
3112 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
3113 strlen(os::file_separator()) + 20, mtInternal);
3114 if (shared_archive_path == NULL) return JNI_ENOMEM;
3115 strcpy(shared_archive_path, jvm_path);
3116 strcat(shared_archive_path, os::file_separator());
3117 strcat(shared_archive_path, "classes");
3118 strcat(shared_archive_path, ".jsa");
3119 SharedArchivePath = shared_archive_path;
3120
3121 // Remaining part of option string
3122 const char* tail;
3123
3124 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3125 const char* hotspotrc = ".hotspotrc";
3126 bool settings_file_specified = false;
3127 bool needs_hotspotrc_warning = false;
3128
3129 const char* flags_file;
3130 int index;
3131 for (index = 0; index < args->nOptions; index++) {
3132 const JavaVMOption *option = args->options + index;
3133 if (match_option(option, "-XX:Flags=", &tail)) {
3134 flags_file = tail;
3135 settings_file_specified = true;
3136 }
3137 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3138 PrintVMOptions = true;
3139 }
3140 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3141 PrintVMOptions = false;
3142 }
3143 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3144 IgnoreUnrecognizedVMOptions = true;
3145 }
3146 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3147 IgnoreUnrecognizedVMOptions = false;
3148 }
3149 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3150 CommandLineFlags::printFlags(tty, false);
3151 vm_exit(0);
3152 }
3153 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3154 #if INCLUDE_NMT
3155 MemTracker::init_tracking_options(tail);
3156 #else
3157 jio_fprintf(defaultStream::error_stream(),
3158 "Native Memory Tracking is not supported in this VM\n");
3159 return JNI_ERR;
3160 #endif
3161 }
3162
3163
3164 #ifndef PRODUCT
3165 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3166 CommandLineFlags::printFlags(tty, true);
3167 vm_exit(0);
3168 }
3169 #endif
3170 }
3171
3172 if (IgnoreUnrecognizedVMOptions) {
3173 // uncast const to modify the flag args->ignoreUnrecognized
3174 *(jboolean*)(&args->ignoreUnrecognized) = true;
3175 }
3176
3177 // Parse specified settings file
3178 if (settings_file_specified) {
3179 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3180 return JNI_EINVAL;
3181 }
3182 } else {
3183 #ifdef ASSERT
3184 // Parse default .hotspotrc settings file
3185 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3186 return JNI_EINVAL;
3187 }
3188 #else
3189 struct stat buf;
3190 if (os::stat(hotspotrc, &buf) == 0) {
3191 needs_hotspotrc_warning = true;
3192 }
3193 #endif
3194 }
3195
3196 if (PrintVMOptions) {
3197 for (index = 0; index < args->nOptions; index++) {
3198 const JavaVMOption *option = args->options + index;
3199 if (match_option(option, "-XX:", &tail)) {
3200 logOption(tail);
3201 }
3202 }
3203 }
3204
3205 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3206 jint result = parse_vm_init_args(args);
3207 if (result != JNI_OK) {
3208 return result;
3209 }
3210
3211 // Delay warning until here so that we've had a chance to process
3212 // the -XX:-PrintWarnings flag
3213 if (needs_hotspotrc_warning) {
3214 warning("%s file is present but has been ignored. "
3215 "Run with -XX:Flags=%s to load the file.",
3216 hotspotrc, hotspotrc);
3217 }
3218
3219 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3220 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3221 #endif
3222
3223 #if INCLUDE_ALL_GCS
3224 #if (defined JAVASE_EMBEDDED || defined ARM)
3225 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3226 #endif
3227 #endif
3228
3229 #ifndef PRODUCT
3230 if (TraceBytecodesAt != 0) {
3231 TraceBytecodes = true;
3232 }
3233 if (CountCompiledCalls) {
3234 if (UseCounterDecay) {
3235 warning("UseCounterDecay disabled because CountCalls is set");
3236 UseCounterDecay = false;
3237 }
3238 }
3239 #endif // PRODUCT
3240
3241 // JSR 292 is not supported before 1.7
3242 if (!JDK_Version::is_gte_jdk17x_version()) {
3243 if (EnableInvokeDynamic) {
3244 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3245 warning("JSR 292 is not supported before 1.7. Disabling support.");
3246 }
3247 EnableInvokeDynamic = false;
3248 }
3249 }
3250
3251 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3252 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3253 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3254 }
3255 ScavengeRootsInCode = 1;
3256 }
3257
3258 if (PrintGCDetails) {
3259 // Turn on -verbose:gc options as well
3260 PrintGC = true;
3261 }
3262
3263 if (!JDK_Version::is_gte_jdk18x_version()) {
3264 // To avoid changing the log format for 7 updates this flag is only
3265 // true by default in JDK8 and above.
3266 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3267 FLAG_SET_DEFAULT(PrintGCCause, false);
3268 }
3269 }
3270
3271 // Set object alignment values.
3272 set_object_alignment();
3273
3274 #if !INCLUDE_ALL_GCS
3275 force_serial_gc();
3276 #endif // INCLUDE_ALL_GCS
3277 #if !INCLUDE_CDS
3278 if (DumpSharedSpaces || RequireSharedSpaces) {
3279 jio_fprintf(defaultStream::error_stream(),
3280 "Shared spaces are not supported in this VM\n");
3281 return JNI_ERR;
3282 }
3283 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3284 warning("Shared spaces are not supported in this VM");
3285 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3286 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3287 }
3288 no_shared_spaces();
3289 #endif // INCLUDE_CDS
3290
3291 // Set flags based on ergonomics.
3292 set_ergonomics_flags();
3293
3294 set_shared_spaces_flags();
3295
3296 // Check the GC selections again.
3297 if (!check_gc_consistency()) {
3298 return JNI_EINVAL;
3299 }
3300
3301 if (TieredCompilation) {
3302 set_tiered_flags();
3303 } else {
3304 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3305 if (CompilationPolicyChoice >= 2) {
3306 vm_exit_during_initialization(
3307 "Incompatible compilation policy selected", NULL);
3308 }
3309 }
3310
3311 // Set heap size based on available physical memory
3312 set_heap_size();
3313
3314 #if INCLUDE_ALL_GCS
3315 // Set per-collector flags
3316 if (UseParallelGC || UseParallelOldGC) {
3317 set_parallel_gc_flags();
3318 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3319 set_cms_and_parnew_gc_flags();
3320 } else if (UseParNewGC) { // skipped if CMS is set above
3321 set_parnew_gc_flags();
3322 } else if (UseG1GC) {
3323 set_g1_gc_flags();
3324 }
3325 check_deprecated_gcs();
3326 check_deprecated_gc_flags();
3327 #else // INCLUDE_ALL_GCS
3328 assert(verify_serial_gc_flags(), "SerialGC unset");
3329 #endif // INCLUDE_ALL_GCS
3330
3331 // Set bytecode rewriting flags
3332 set_bytecode_flags();
3333
3334 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3335 set_aggressive_opts_flags();
3336
3337 // Turn off biased locking for locking debug mode flags,
3338 // which are subtlely different from each other but neither works with
3339 // biased locking.
3340 if (UseHeavyMonitors
3341 #ifdef COMPILER1
3342 || !UseFastLocking
3343 #endif // COMPILER1
3344 ) {
3345 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3346 // flag set to true on command line; warn the user that they
3347 // can't enable biased locking here
3348 warning("Biased Locking is not supported with locking debug flags"
3349 "; ignoring UseBiasedLocking flag." );
3350 }
3351 UseBiasedLocking = false;
3352 }
3353
3354 #ifdef CC_INTERP
3355 // Clear flags not supported by the C++ interpreter
3356 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3357 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3358 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3359 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
3360 #endif // CC_INTERP
3361
3362 #ifdef COMPILER2
3363 if (!UseBiasedLocking || EmitSync != 0) {
3364 UseOptoBiasInlining = false;
3365 }
3366 if (!EliminateLocks) {
3367 EliminateNestedLocks = false;
3368 }
3369 if (!Inline) {
3370 IncrementalInline = false;
3371 }
3372 #ifndef PRODUCT
3373 if (!IncrementalInline) {
3374 AlwaysIncrementalInline = false;
3375 }
3376 #endif
3377 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3378 // incremental inlining: bump MaxNodeLimit
3379 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3380 }
3381 #endif
3382
3383 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3384 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3385 DebugNonSafepoints = true;
3386 }
3387
3388 #ifndef PRODUCT
3389 if (CompileTheWorld) {
3390 // Force NmethodSweeper to sweep whole CodeCache each time.
3391 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3392 NmethodSweepFraction = 1;
3393 }
3394 }
3395 #endif
3396
3397 if (PrintCommandLineFlags) {
3398 CommandLineFlags::printSetFlags(tty);
3399 }
3400
3401 // Apply CPU specific policy for the BiasedLocking
3402 if (UseBiasedLocking) {
3403 if (!VM_Version::use_biased_locking() &&
3404 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3405 UseBiasedLocking = false;
3406 }
3407 }
3408
3409 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3410 // but only if not already set on the commandline
3411 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3412 bool set = false;
3413 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3414 if (!set) {
3415 FLAG_SET_DEFAULT(PauseAtExit, true);
3416 }
3417 }
3418
3419 return JNI_OK;
3420 }
3421
3422 jint Arguments::adjust_after_os() {
3423 #if INCLUDE_ALL_GCS
3424 if (UseParallelGC || UseParallelOldGC) {
3425 if (UseNUMA) {
3426 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3427 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3428 }
3429 // For those collectors or operating systems (eg, Windows) that do
3430 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3431 UseNUMAInterleaving = true;
3432 }
3433 }
3434 #endif // INCLUDE_ALL_GCS
3435 return JNI_OK;
3436 }
3437
3438 int Arguments::PropertyList_count(SystemProperty* pl) {
3439 int count = 0;
3440 while(pl != NULL) {
3441 count++;
3442 pl = pl->next();
3443 }
3444 return count;
3445 }
3446
3447 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3448 assert(key != NULL, "just checking");
3449 SystemProperty* prop;
3450 for (prop = pl; prop != NULL; prop = prop->next()) {
3451 if (strcmp(key, prop->key()) == 0) return prop->value();
3452 }
3453 return NULL;
3454 }
3455
3456 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3457 int count = 0;
3458 const char* ret_val = NULL;
3459
3460 while(pl != NULL) {
3461 if(count >= index) {
3462 ret_val = pl->key();
3463 break;
3464 }
3465 count++;
3466 pl = pl->next();
3467 }
3468
3469 return ret_val;
3470 }
3471
3472 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3473 int count = 0;
3474 char* ret_val = NULL;
3475
3476 while(pl != NULL) {
3477 if(count >= index) {
3478 ret_val = pl->value();
3479 break;
3480 }
3481 count++;
3482 pl = pl->next();
3483 }
3484
3485 return ret_val;
3486 }
3487
3488 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3489 SystemProperty* p = *plist;
3490 if (p == NULL) {
3491 *plist = new_p;
3492 } else {
3493 while (p->next() != NULL) {
3494 p = p->next();
3495 }
3496 p->set_next(new_p);
3497 }
3498 }
3499
3500 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3501 if (plist == NULL)
3502 return;
3503
3504 SystemProperty* new_p = new SystemProperty(k, v, true);
3505 PropertyList_add(plist, new_p);
3506 }
3507
3508 // This add maintains unique property key in the list.
3509 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3510 if (plist == NULL)
3511 return;
3512
3513 // If property key exist then update with new value.
3514 SystemProperty* prop;
3515 for (prop = *plist; prop != NULL; prop = prop->next()) {
3516 if (strcmp(k, prop->key()) == 0) {
3517 if (append) {
3518 prop->append_value(v);
3519 } else {
3520 prop->set_value(v);
3521 }
3522 return;
3523 }
3524 }
3525
3526 PropertyList_add(plist, k, v);
3527 }
3528
3529 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3530 // Returns true if all of the source pointed by src has been copied over to
3531 // the destination buffer pointed by buf. Otherwise, returns false.
3532 // Notes:
3533 // 1. If the length (buflen) of the destination buffer excluding the
3534 // NULL terminator character is not long enough for holding the expanded
3535 // pid characters, it also returns false instead of returning the partially
3536 // expanded one.
3537 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3538 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3539 char* buf, size_t buflen) {
3540 const char* p = src;
3541 char* b = buf;
3542 const char* src_end = &src[srclen];
3543 char* buf_end = &buf[buflen - 1];
3544
3545 while (p < src_end && b < buf_end) {
3546 if (*p == '%') {
3547 switch (*(++p)) {
3548 case '%': // "%%" ==> "%"
3549 *b++ = *p++;
3550 break;
3551 case 'p': { // "%p" ==> current process id
3552 // buf_end points to the character before the last character so
3553 // that we could write '\0' to the end of the buffer.
3554 size_t buf_sz = buf_end - b + 1;
3555 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3556
3557 // if jio_snprintf fails or the buffer is not long enough to hold
3558 // the expanded pid, returns false.
3559 if (ret < 0 || ret >= (int)buf_sz) {
3560 return false;
3561 } else {
3562 b += ret;
3563 assert(*b == '\0', "fail in copy_expand_pid");
3564 if (p == src_end && b == buf_end + 1) {
3565 // reach the end of the buffer.
3566 return true;
3567 }
3568 }
3569 p++;
3570 break;
3571 }
3572 default :
3573 *b++ = '%';
3574 }
3575 } else {
3576 *b++ = *p++;
3577 }
3578 }
3579 *b = '\0';
3580 return (p == src_end); // return false if not all of the source was copied
3581 }