1 /*
2 * Copyright (c) 1997, 2012, 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 "compiler/compilerOracle.hpp"
28 #include "memory/allocation.inline.hpp"
29 #include "memory/cardTableRS.hpp"
30 #include "memory/referenceProcessor.hpp"
31 #include "memory/universe.inline.hpp"
32 #include "oops/oop.inline.hpp"
33 #include "prims/jvmtiExport.hpp"
34 #include "runtime/arguments.hpp"
35 #include "runtime/globals_extension.hpp"
36 #include "runtime/java.hpp"
37 #include "services/management.hpp"
38 #include "services/memTracker.hpp"
39 #include "utilities/defaultStream.hpp"
40 #include "utilities/taskqueue.hpp"
41 #ifdef TARGET_OS_FAMILY_linux
42 # include "os_linux.inline.hpp"
43 #endif
44 #ifdef TARGET_OS_FAMILY_solaris
45 # include "os_solaris.inline.hpp"
46 #endif
47 #ifdef TARGET_OS_FAMILY_windows
48 # include "os_windows.inline.hpp"
49 #endif
50 #ifdef TARGET_OS_FAMILY_bsd
51 # include "os_bsd.inline.hpp"
52 #endif
53 #ifndef SERIALGC
54 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
55 #endif
56
57 // Note: This is a special bug reporting site for the JVM
58 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
59 #define DEFAULT_JAVA_LAUNCHER "generic"
60
61 char** Arguments::_jvm_flags_array = NULL;
62 int Arguments::_num_jvm_flags = 0;
63 char** Arguments::_jvm_args_array = NULL;
64 int Arguments::_num_jvm_args = 0;
65 char* Arguments::_java_command = NULL;
66 SystemProperty* Arguments::_system_properties = NULL;
67 const char* Arguments::_gc_log_filename = NULL;
68 bool Arguments::_has_profile = false;
69 bool Arguments::_has_alloc_profile = false;
70 uintx Arguments::_min_heap_size = 0;
71 Arguments::Mode Arguments::_mode = _mixed;
72 bool Arguments::_java_compiler = false;
73 bool Arguments::_xdebug_mode = false;
74 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
75 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
76 int Arguments::_sun_java_launcher_pid = -1;
77 bool Arguments::_created_by_gamma_launcher = false;
78
79 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
80 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
81 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
82 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
83 bool Arguments::_ClipInlining = ClipInlining;
84
85 char* Arguments::SharedArchivePath = NULL;
86
87 AgentLibraryList Arguments::_libraryList;
88 AgentLibraryList Arguments::_agentList;
89
90 abort_hook_t Arguments::_abort_hook = NULL;
91 exit_hook_t Arguments::_exit_hook = NULL;
92 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
93
94
95 SystemProperty *Arguments::_java_ext_dirs = NULL;
96 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
97 SystemProperty *Arguments::_sun_boot_library_path = NULL;
98 SystemProperty *Arguments::_java_library_path = NULL;
99 SystemProperty *Arguments::_java_home = NULL;
100 SystemProperty *Arguments::_java_class_path = NULL;
101 SystemProperty *Arguments::_sun_boot_class_path = NULL;
102
103 char* Arguments::_meta_index_path = NULL;
104 char* Arguments::_meta_index_dir = NULL;
105
106 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
107
108 static bool match_option(const JavaVMOption *option, const char* name,
109 const char** tail) {
110 int len = (int)strlen(name);
111 if (strncmp(option->optionString, name, len) == 0) {
112 *tail = option->optionString + len;
113 return true;
114 } else {
115 return false;
116 }
117 }
118
119 static void logOption(const char* opt) {
120 if (PrintVMOptions) {
121 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
122 }
123 }
124
125 // Process java launcher properties.
126 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
127 // See if sun.java.launcher or sun.java.launcher.pid is defined.
128 // Must do this before setting up other system properties,
129 // as some of them may depend on launcher type.
130 for (int index = 0; index < args->nOptions; index++) {
131 const JavaVMOption* option = args->options + index;
132 const char* tail;
133
134 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
135 process_java_launcher_argument(tail, option->extraInfo);
136 continue;
137 }
138 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
139 _sun_java_launcher_pid = atoi(tail);
140 continue;
141 }
142 }
143 }
144
145 // Initialize system properties key and value.
146 void Arguments::init_system_properties() {
147
148 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
149 "Java Virtual Machine Specification", false));
150 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
153
154 // following are JVMTI agent writeable properties.
155 // Properties values are set to NULL and they are
156 // os specific they are initialized in os::init_system_properties_values().
157 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
158 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
159 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
160 _java_library_path = new SystemProperty("java.library.path", NULL, true);
161 _java_home = new SystemProperty("java.home", NULL, true);
162 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
163
164 _java_class_path = new SystemProperty("java.class.path", "", true);
165
166 // Add to System Property list.
167 PropertyList_add(&_system_properties, _java_ext_dirs);
168 PropertyList_add(&_system_properties, _java_endorsed_dirs);
169 PropertyList_add(&_system_properties, _sun_boot_library_path);
170 PropertyList_add(&_system_properties, _java_library_path);
171 PropertyList_add(&_system_properties, _java_home);
172 PropertyList_add(&_system_properties, _java_class_path);
173 PropertyList_add(&_system_properties, _sun_boot_class_path);
174
175 // Set OS specific system properties values
176 os::init_system_properties_values();
177 }
178
179
180 // Update/Initialize System properties after JDK version number is known
181 void Arguments::init_version_specific_system_properties() {
182 enum { bufsz = 16 };
183 char buffer[bufsz];
184 const char* spec_vendor = "Sun Microsystems Inc.";
185 uint32_t spec_version = 0;
186
187 if (JDK_Version::is_gte_jdk17x_version()) {
188 spec_vendor = "Oracle Corporation";
189 spec_version = JDK_Version::current().major_version();
190 }
191 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
192
193 PropertyList_add(&_system_properties,
194 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
195 PropertyList_add(&_system_properties,
196 new SystemProperty("java.vm.specification.version", buffer, false));
197 PropertyList_add(&_system_properties,
198 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
199 }
200
201 /**
202 * Provide a slightly more user-friendly way of eliminating -XX flags.
203 * When a flag is eliminated, it can be added to this list in order to
204 * continue accepting this flag on the command-line, while issuing a warning
205 * and ignoring the value. Once the JDK version reaches the 'accept_until'
206 * limit, we flatly refuse to admit the existence of the flag. This allows
207 * a flag to die correctly over JDK releases using HSX.
208 */
209 typedef struct {
210 const char* name;
211 JDK_Version obsoleted_in; // when the flag went away
212 JDK_Version accept_until; // which version to start denying the existence
213 } ObsoleteFlag;
214
215 static ObsoleteFlag obsolete_jvm_flags[] = {
216 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
217 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
218 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
230 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
231 { "DefaultInitialRAMFraction",
232 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
233 { "UseDepthFirstScavengeOrder",
234 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
235 { "HandlePromotionFailure",
236 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
237 { "MaxLiveObjectEvacuationRatio",
238 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
239 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
240 { "UseParallelOldGCCompacting",
241 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
242 { "UseParallelDensePrefixUpdate",
243 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
244 { "UseParallelOldGCDensePrefix",
245 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
246 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
247 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
248 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
249 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
250 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
251 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
252 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
253 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
254 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
255 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
256 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
257 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
258 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
259 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
260 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
261 #ifdef PRODUCT
262 { "DesiredMethodLimit",
263 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
264 #endif // PRODUCT
265 { NULL, JDK_Version(0), JDK_Version(0) }
266 };
267
268 // Returns true if the flag is obsolete and fits into the range specified
269 // for being ignored. In the case that the flag is ignored, the 'version'
270 // value is filled in with the version number when the flag became
271 // obsolete so that that value can be displayed to the user.
272 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
273 int i = 0;
274 assert(version != NULL, "Must provide a version buffer");
275 while (obsolete_jvm_flags[i].name != NULL) {
276 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
277 // <flag>=xxx form
278 // [-|+]<flag> form
279 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
280 ((s[0] == '+' || s[0] == '-') &&
281 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
282 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
283 *version = flag_status.obsoleted_in;
284 return true;
285 }
286 }
287 i++;
288 }
289 return false;
290 }
291
292 // Constructs the system class path (aka boot class path) from the following
293 // components, in order:
294 //
295 // prefix // from -Xbootclasspath/p:...
296 // endorsed // the expansion of -Djava.endorsed.dirs=...
297 // base // from os::get_system_properties() or -Xbootclasspath=
298 // suffix // from -Xbootclasspath/a:...
299 //
300 // java.endorsed.dirs is a list of directories; any jar or zip files in the
301 // directories are added to the sysclasspath just before the base.
302 //
303 // This could be AllStatic, but it isn't needed after argument processing is
304 // complete.
305 class SysClassPath: public StackObj {
306 public:
307 SysClassPath(const char* base);
308 ~SysClassPath();
309
310 inline void set_base(const char* base);
311 inline void add_prefix(const char* prefix);
312 inline void add_suffix_to_prefix(const char* suffix);
313 inline void add_suffix(const char* suffix);
314 inline void reset_path(const char* base);
315
316 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
317 // property. Must be called after all command-line arguments have been
318 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
319 // combined_path().
320 void expand_endorsed();
321
322 inline const char* get_base() const { return _items[_scp_base]; }
323 inline const char* get_prefix() const { return _items[_scp_prefix]; }
324 inline const char* get_suffix() const { return _items[_scp_suffix]; }
325 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
326
327 // Combine all the components into a single c-heap-allocated string; caller
328 // must free the string if/when no longer needed.
329 char* combined_path();
330
331 private:
332 // Utility routines.
333 static char* add_to_path(const char* path, const char* str, bool prepend);
334 static char* add_jars_to_path(char* path, const char* directory);
335
336 inline void reset_item_at(int index);
337
338 // Array indices for the items that make up the sysclasspath. All except the
339 // base are allocated in the C heap and freed by this class.
340 enum {
341 _scp_prefix, // from -Xbootclasspath/p:...
342 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
343 _scp_base, // the default sysclasspath
344 _scp_suffix, // from -Xbootclasspath/a:...
345 _scp_nitems // the number of items, must be last.
346 };
347
348 const char* _items[_scp_nitems];
349 DEBUG_ONLY(bool _expansion_done;)
350 };
351
352 SysClassPath::SysClassPath(const char* base) {
353 memset(_items, 0, sizeof(_items));
354 _items[_scp_base] = base;
355 DEBUG_ONLY(_expansion_done = false;)
356 }
357
358 SysClassPath::~SysClassPath() {
359 // Free everything except the base.
360 for (int i = 0; i < _scp_nitems; ++i) {
361 if (i != _scp_base) reset_item_at(i);
362 }
363 DEBUG_ONLY(_expansion_done = false;)
364 }
365
366 inline void SysClassPath::set_base(const char* base) {
367 _items[_scp_base] = base;
368 }
369
370 inline void SysClassPath::add_prefix(const char* prefix) {
371 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
372 }
373
374 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
375 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
376 }
377
378 inline void SysClassPath::add_suffix(const char* suffix) {
379 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
380 }
381
382 inline void SysClassPath::reset_item_at(int index) {
383 assert(index < _scp_nitems && index != _scp_base, "just checking");
384 if (_items[index] != NULL) {
385 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
386 _items[index] = NULL;
387 }
388 }
389
390 inline void SysClassPath::reset_path(const char* base) {
391 // Clear the prefix and suffix.
392 reset_item_at(_scp_prefix);
393 reset_item_at(_scp_suffix);
394 set_base(base);
395 }
396
397 //------------------------------------------------------------------------------
398
399 void SysClassPath::expand_endorsed() {
400 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
401
402 const char* path = Arguments::get_property("java.endorsed.dirs");
403 if (path == NULL) {
404 path = Arguments::get_endorsed_dir();
405 assert(path != NULL, "no default for java.endorsed.dirs");
406 }
407
408 char* expanded_path = NULL;
409 const char separator = *os::path_separator();
410 const char* const end = path + strlen(path);
411 while (path < end) {
412 const char* tmp_end = strchr(path, separator);
413 if (tmp_end == NULL) {
414 expanded_path = add_jars_to_path(expanded_path, path);
415 path = end;
416 } else {
417 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
418 memcpy(dirpath, path, tmp_end - path);
419 dirpath[tmp_end - path] = '\0';
420 expanded_path = add_jars_to_path(expanded_path, dirpath);
421 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
422 path = tmp_end + 1;
423 }
424 }
425 _items[_scp_endorsed] = expanded_path;
426 DEBUG_ONLY(_expansion_done = true;)
427 }
428
429 // Combine the bootclasspath elements, some of which may be null, into a single
430 // c-heap-allocated string.
431 char* SysClassPath::combined_path() {
432 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
433 assert(_expansion_done, "must call expand_endorsed() first.");
434
435 size_t lengths[_scp_nitems];
436 size_t total_len = 0;
437
438 const char separator = *os::path_separator();
439
440 // Get the lengths.
441 int i;
442 for (i = 0; i < _scp_nitems; ++i) {
443 if (_items[i] != NULL) {
444 lengths[i] = strlen(_items[i]);
445 // Include space for the separator char (or a NULL for the last item).
446 total_len += lengths[i] + 1;
447 }
448 }
449 assert(total_len > 0, "empty sysclasspath not allowed");
450
451 // Copy the _items to a single string.
452 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
453 char* cp_tmp = cp;
454 for (i = 0; i < _scp_nitems; ++i) {
455 if (_items[i] != NULL) {
456 memcpy(cp_tmp, _items[i], lengths[i]);
457 cp_tmp += lengths[i];
458 *cp_tmp++ = separator;
459 }
460 }
461 *--cp_tmp = '\0'; // Replace the extra separator.
462 return cp;
463 }
464
465 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
466 char*
467 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
468 char *cp;
469
470 assert(str != NULL, "just checking");
471 if (path == NULL) {
472 size_t len = strlen(str) + 1;
473 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
474 memcpy(cp, str, len); // copy the trailing null
475 } else {
476 const char separator = *os::path_separator();
477 size_t old_len = strlen(path);
478 size_t str_len = strlen(str);
479 size_t len = old_len + str_len + 2;
480
481 if (prepend) {
482 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
483 char* cp_tmp = cp;
484 memcpy(cp_tmp, str, str_len);
485 cp_tmp += str_len;
486 *cp_tmp = separator;
487 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
488 FREE_C_HEAP_ARRAY(char, path, mtInternal);
489 } else {
490 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
491 char* cp_tmp = cp + old_len;
492 *cp_tmp = separator;
493 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
494 }
495 }
496 return cp;
497 }
498
499 // Scan the directory and append any jar or zip files found to path.
500 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
501 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
502 DIR* dir = os::opendir(directory);
503 if (dir == NULL) return path;
504
505 char dir_sep[2] = { '\0', '\0' };
506 size_t directory_len = strlen(directory);
507 const char fileSep = *os::file_separator();
508 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
509
510 /* Scan the directory for jars/zips, appending them to path. */
511 struct dirent *entry;
512 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
513 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
514 const char* name = entry->d_name;
515 const char* ext = name + strlen(name) - 4;
516 bool isJarOrZip = ext > name &&
517 (os::file_name_strcmp(ext, ".jar") == 0 ||
518 os::file_name_strcmp(ext, ".zip") == 0);
519 if (isJarOrZip) {
520 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
521 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
522 path = add_to_path(path, jarpath, false);
523 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
524 }
525 }
526 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
527 os::closedir(dir);
528 return path;
529 }
530
531 // Parses a memory size specification string.
532 static bool atomull(const char *s, julong* result) {
533 julong n = 0;
534 int args_read = sscanf(s, os::julong_format_specifier(), &n);
535 if (args_read != 1) {
536 return false;
537 }
538 while (*s != '\0' && isdigit(*s)) {
539 s++;
540 }
541 // 4705540: illegal if more characters are found after the first non-digit
542 if (strlen(s) > 1) {
543 return false;
544 }
545 switch (*s) {
546 case 'T': case 't':
547 *result = n * G * K;
548 // Check for overflow.
549 if (*result/((julong)G * K) != n) return false;
550 return true;
551 case 'G': case 'g':
552 *result = n * G;
553 if (*result/G != n) return false;
554 return true;
555 case 'M': case 'm':
556 *result = n * M;
557 if (*result/M != n) return false;
558 return true;
559 case 'K': case 'k':
560 *result = n * K;
561 if (*result/K != n) return false;
562 return true;
563 case '\0':
564 *result = n;
565 return true;
566 default:
567 return false;
568 }
569 }
570
571 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
572 if (size < min_size) return arg_too_small;
573 // Check that size will fit in a size_t (only relevant on 32-bit)
574 if (size > max_uintx) return arg_too_big;
575 return arg_in_range;
576 }
577
578 // Describe an argument out of range error
579 void Arguments::describe_range_error(ArgsRange errcode) {
580 switch(errcode) {
581 case arg_too_big:
582 jio_fprintf(defaultStream::error_stream(),
583 "The specified size exceeds the maximum "
584 "representable size.\n");
585 break;
586 case arg_too_small:
587 case arg_unreadable:
588 case arg_in_range:
589 // do nothing for now
590 break;
591 default:
592 ShouldNotReachHere();
593 }
594 }
595
596 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
597 return CommandLineFlags::boolAtPut(name, &value, origin);
598 }
599
600 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
601 double v;
602 if (sscanf(value, "%lf", &v) != 1) {
603 return false;
604 }
605
606 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
607 return true;
608 }
609 return false;
610 }
611
612 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
613 julong v;
614 intx intx_v;
615 bool is_neg = false;
616 // Check the sign first since atomull() parses only unsigned values.
617 if (*value == '-') {
618 if (!CommandLineFlags::intxAt(name, &intx_v)) {
619 return false;
620 }
621 value++;
622 is_neg = true;
623 }
624 if (!atomull(value, &v)) {
625 return false;
626 }
627 intx_v = (intx) v;
628 if (is_neg) {
629 intx_v = -intx_v;
630 }
631 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
632 return true;
633 }
634 uintx uintx_v = (uintx) v;
635 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
636 return true;
637 }
638 uint64_t uint64_t_v = (uint64_t) v;
639 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
640 return true;
641 }
642 return false;
643 }
644
645 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
646 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
647 // Contract: CommandLineFlags always returns a pointer that needs freeing.
648 FREE_C_HEAP_ARRAY(char, value, mtInternal);
649 return true;
650 }
651
652 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
653 const char* old_value = "";
654 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
655 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
656 size_t new_len = strlen(new_value);
657 const char* value;
658 char* free_this_too = NULL;
659 if (old_len == 0) {
660 value = new_value;
661 } else if (new_len == 0) {
662 value = old_value;
663 } else {
664 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
665 // each new setting adds another LINE to the switch:
666 sprintf(buf, "%s\n%s", old_value, new_value);
667 value = buf;
668 free_this_too = buf;
669 }
670 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
671 // CommandLineFlags always returns a pointer that needs freeing.
672 FREE_C_HEAP_ARRAY(char, value, mtInternal);
673 if (free_this_too != NULL) {
674 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
675 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
676 }
677 return true;
678 }
679
680 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
681
682 // range of acceptable characters spelled out for portability reasons
683 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
684 #define BUFLEN 255
685 char name[BUFLEN+1];
686 char dummy;
687
688 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
689 return set_bool_flag(name, false, origin);
690 }
691 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
692 return set_bool_flag(name, true, origin);
693 }
694
695 char punct;
696 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
697 const char* value = strchr(arg, '=') + 1;
698 Flag* flag = Flag::find_flag(name, strlen(name));
699 if (flag != NULL && flag->is_ccstr()) {
700 if (flag->ccstr_accumulates()) {
701 return append_to_string_flag(name, value, origin);
702 } else {
703 if (value[0] == '\0') {
704 value = NULL;
705 }
706 return set_string_flag(name, value, origin);
707 }
708 }
709 }
710
711 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
712 const char* value = strchr(arg, '=') + 1;
713 // -XX:Foo:=xxx will reset the string flag to the given value.
714 if (value[0] == '\0') {
715 value = NULL;
716 }
717 return set_string_flag(name, value, origin);
718 }
719
720 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
721 #define SIGNED_NUMBER_RANGE "[-0123456789]"
722 #define NUMBER_RANGE "[0123456789]"
723 char value[BUFLEN + 1];
724 char value2[BUFLEN + 1];
725 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
726 // Looks like a floating-point number -- try again with more lenient format string
727 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
728 return set_fp_numeric_flag(name, value, origin);
729 }
730 }
731
732 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
733 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
734 return set_numeric_flag(name, value, origin);
735 }
736
737 return false;
738 }
739
740 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
741 assert(bldarray != NULL, "illegal argument");
742
743 if (arg == NULL) {
744 return;
745 }
746
747 int index = *count;
748
749 // expand the array and add arg to the last element
750 (*count)++;
751 if (*bldarray == NULL) {
752 *bldarray = NEW_C_HEAP_ARRAY(char*, *count, mtInternal);
753 } else {
754 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count, mtInternal);
755 }
756 (*bldarray)[index] = strdup(arg);
757 }
758
759 void Arguments::build_jvm_args(const char* arg) {
760 add_string(&_jvm_args_array, &_num_jvm_args, arg);
761 }
762
763 void Arguments::build_jvm_flags(const char* arg) {
764 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
765 }
766
767 // utility function to return a string that concatenates all
768 // strings in a given char** array
769 const char* Arguments::build_resource_string(char** args, int count) {
770 if (args == NULL || count == 0) {
771 return NULL;
772 }
773 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
774 for (int i = 1; i < count; i++) {
775 length += strlen(args[i]) + 1; // add 1 for a space
776 }
777 char* s = NEW_RESOURCE_ARRAY(char, length);
778 strcpy(s, args[0]);
779 for (int j = 1; j < count; j++) {
780 strcat(s, " ");
781 strcat(s, args[j]);
782 }
783 return (const char*) s;
784 }
785
786 void Arguments::print_on(outputStream* st) {
787 st->print_cr("VM Arguments:");
788 if (num_jvm_flags() > 0) {
789 st->print("jvm_flags: "); print_jvm_flags_on(st);
790 }
791 if (num_jvm_args() > 0) {
792 st->print("jvm_args: "); print_jvm_args_on(st);
793 }
794 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
795 if (_java_class_path != NULL) {
796 char* path = _java_class_path->value();
797 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
798 }
799 st->print_cr("Launcher Type: %s", _sun_java_launcher);
800 }
801
802 void Arguments::print_jvm_flags_on(outputStream* st) {
803 if (_num_jvm_flags > 0) {
804 for (int i=0; i < _num_jvm_flags; i++) {
805 st->print("%s ", _jvm_flags_array[i]);
806 }
807 st->print_cr("");
808 }
809 }
810
811 void Arguments::print_jvm_args_on(outputStream* st) {
812 if (_num_jvm_args > 0) {
813 for (int i=0; i < _num_jvm_args; i++) {
814 st->print("%s ", _jvm_args_array[i]);
815 }
816 st->print_cr("");
817 }
818 }
819
820 bool Arguments::process_argument(const char* arg,
821 jboolean ignore_unrecognized, FlagValueOrigin origin) {
822
823 JDK_Version since = JDK_Version();
824
825 if (parse_argument(arg, origin) || ignore_unrecognized) {
826 return true;
827 }
828
829 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg;
830 if (is_newly_obsolete(arg, &since)) {
831 char version[256];
832 since.to_string(version, sizeof(version));
833 warning("ignoring option %s; support was removed in %s", argname, version);
834 return true;
835 }
836
837 // For locked flags, report a custom error message if available.
838 // Otherwise, report the standard unrecognized VM option.
839
840 Flag* locked_flag = Flag::find_flag((char*)argname, strlen(argname), true);
841 if (locked_flag != NULL) {
842 char locked_message_buf[BUFLEN];
843 locked_flag->get_locked_message(locked_message_buf, BUFLEN);
844 if (strlen(locked_message_buf) == 0) {
845 jio_fprintf(defaultStream::error_stream(),
846 "Unrecognized VM option '%s'\n", argname);
847 } else {
848 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
849 }
850 } else {
851 jio_fprintf(defaultStream::error_stream(),
852 "Unrecognized VM option '%s'\n", argname);
853 }
854
855 // allow for commandline "commenting out" options like -XX:#+Verbose
856 return arg[0] == '#';
857 }
858
859 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
860 FILE* stream = fopen(file_name, "rb");
861 if (stream == NULL) {
862 if (should_exist) {
863 jio_fprintf(defaultStream::error_stream(),
864 "Could not open settings file %s\n", file_name);
865 return false;
866 } else {
867 return true;
868 }
869 }
870
871 char token[1024];
872 int pos = 0;
873
874 bool in_white_space = true;
875 bool in_comment = false;
876 bool in_quote = false;
877 char quote_c = 0;
878 bool result = true;
879
880 int c = getc(stream);
881 while(c != EOF && pos < (int)(sizeof(token)-1)) {
882 if (in_white_space) {
883 if (in_comment) {
884 if (c == '\n') in_comment = false;
885 } else {
886 if (c == '#') in_comment = true;
887 else if (!isspace(c)) {
888 in_white_space = false;
889 token[pos++] = c;
890 }
891 }
892 } else {
893 if (c == '\n' || (!in_quote && isspace(c))) {
894 // token ends at newline, or at unquoted whitespace
895 // this allows a way to include spaces in string-valued options
896 token[pos] = '\0';
897 logOption(token);
898 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
899 build_jvm_flags(token);
900 pos = 0;
901 in_white_space = true;
902 in_quote = false;
903 } else if (!in_quote && (c == '\'' || c == '"')) {
904 in_quote = true;
905 quote_c = c;
906 } else if (in_quote && (c == quote_c)) {
907 in_quote = false;
908 } else {
909 token[pos++] = c;
910 }
911 }
912 c = getc(stream);
913 }
914 if (pos > 0) {
915 token[pos] = '\0';
916 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
917 build_jvm_flags(token);
918 }
919 fclose(stream);
920 return result;
921 }
922
923 //=============================================================================================================
924 // Parsing of properties (-D)
925
926 const char* Arguments::get_property(const char* key) {
927 return PropertyList_get_value(system_properties(), key);
928 }
929
930 bool Arguments::add_property(const char* prop) {
931 const char* eq = strchr(prop, '=');
932 char* key;
933 // ns must be static--its address may be stored in a SystemProperty object.
934 const static char ns[1] = {0};
935 char* value = (char *)ns;
936
937 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
938 key = AllocateHeap(key_len + 1, mtInternal);
939 strncpy(key, prop, key_len);
940 key[key_len] = '\0';
941
942 if (eq != NULL) {
943 size_t value_len = strlen(prop) - key_len - 1;
944 value = AllocateHeap(value_len + 1, mtInternal);
945 strncpy(value, &prop[key_len + 1], value_len + 1);
946 }
947
948 if (strcmp(key, "java.compiler") == 0) {
949 process_java_compiler_argument(value);
950 FreeHeap(key);
951 if (eq != NULL) {
952 FreeHeap(value);
953 }
954 return true;
955 } else if (strcmp(key, "sun.java.command") == 0) {
956 _java_command = value;
957
958 // Record value in Arguments, but let it get passed to Java.
959 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
960 // launcher.pid property is private and is processed
961 // in process_sun_java_launcher_properties();
962 // the sun.java.launcher property is passed on to the java application
963 FreeHeap(key);
964 if (eq != NULL) {
965 FreeHeap(value);
966 }
967 return true;
968 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
969 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
970 // its value without going through the property list or making a Java call.
971 _java_vendor_url_bug = value;
972 } else if (strcmp(key, "sun.boot.library.path") == 0) {
973 PropertyList_unique_add(&_system_properties, key, value, true);
974 return true;
975 }
976 // Create new property and add at the end of the list
977 PropertyList_unique_add(&_system_properties, key, value);
978 return true;
979 }
980
981 //===========================================================================================================
982 // Setting int/mixed/comp mode flags
983
984 void Arguments::set_mode_flags(Mode mode) {
985 // Set up default values for all flags.
986 // If you add a flag to any of the branches below,
987 // add a default value for it here.
988 set_java_compiler(false);
989 _mode = mode;
990
991 // Ensure Agent_OnLoad has the correct initial values.
992 // This may not be the final mode; mode may change later in onload phase.
993 PropertyList_unique_add(&_system_properties, "java.vm.info",
994 (char*)VM_Version::vm_info_string(), false);
995
996 UseInterpreter = true;
997 UseCompiler = true;
998 UseLoopCounter = true;
999
1000 #ifndef ZERO
1001 // Turn these off for mixed and comp. Leave them on for Zero.
1002 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1003 UseFastAccessorMethods = (mode == _int);
1004 }
1005 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1006 UseFastEmptyMethods = (mode == _int);
1007 }
1008 #endif
1009
1010 // Default values may be platform/compiler dependent -
1011 // use the saved values
1012 ClipInlining = Arguments::_ClipInlining;
1013 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1014 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1015 BackgroundCompilation = Arguments::_BackgroundCompilation;
1016
1017 // Change from defaults based on mode
1018 switch (mode) {
1019 default:
1020 ShouldNotReachHere();
1021 break;
1022 case _int:
1023 UseCompiler = false;
1024 UseLoopCounter = false;
1025 AlwaysCompileLoopMethods = false;
1026 UseOnStackReplacement = false;
1027 break;
1028 case _mixed:
1029 // same as default
1030 break;
1031 case _comp:
1032 UseInterpreter = false;
1033 BackgroundCompilation = false;
1034 ClipInlining = false;
1035 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1036 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1037 // compile a level 4 (C2) and then continue executing it.
1038 if (TieredCompilation) {
1039 Tier3InvokeNotifyFreqLog = 0;
1040 Tier4InvocationThreshold = 0;
1041 }
1042 break;
1043 }
1044 }
1045
1046 // Conflict: required to use shared spaces (-Xshare:on), but
1047 // incompatible command line options were chosen.
1048
1049 static void no_shared_spaces() {
1050 if (RequireSharedSpaces) {
1051 jio_fprintf(defaultStream::error_stream(),
1052 "Class data sharing is inconsistent with other specified options.\n");
1053 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1054 } else {
1055 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1056 }
1057 }
1058
1059 void Arguments::set_tiered_flags() {
1060 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1061 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1062 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1063 }
1064 if (CompilationPolicyChoice < 2) {
1065 vm_exit_during_initialization(
1066 "Incompatible compilation policy selected", NULL);
1067 }
1068 // Increase the code cache size - tiered compiles a lot more.
1069 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1070 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1071 }
1072 }
1073
1074 #if INCLUDE_ALTERNATE_GCS
1075 static void disable_adaptive_size_policy(const char* collector_name) {
1076 if (UseAdaptiveSizePolicy) {
1077 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1078 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1079 collector_name);
1080 }
1081 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1082 }
1083 }
1084
1085 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1086 // if it's not explictly set or unset. If the user has chosen
1087 // UseParNewGC and not explicitly set ParallelGCThreads we
1088 // set it, unless this is a single cpu machine.
1089 void Arguments::set_parnew_gc_flags() {
1090 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1091 "control point invariant");
1092 assert(UseParNewGC, "Error");
1093
1094 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1095 disable_adaptive_size_policy("UseParNewGC");
1096
1097 if (ParallelGCThreads == 0) {
1098 FLAG_SET_DEFAULT(ParallelGCThreads,
1099 Abstract_VM_Version::parallel_worker_threads());
1100 if (ParallelGCThreads == 1) {
1101 FLAG_SET_DEFAULT(UseParNewGC, false);
1102 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1103 }
1104 }
1105 if (UseParNewGC) {
1106 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1107 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1108 // we set them to 1024 and 1024.
1109 // See CR 6362902.
1110 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1111 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1112 }
1113 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1114 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1115 }
1116
1117 // AlwaysTenure flag should make ParNew promote all at first collection.
1118 // See CR 6362902.
1119 if (AlwaysTenure) {
1120 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1121 }
1122 // When using compressed oops, we use local overflow stacks,
1123 // rather than using a global overflow list chained through
1124 // the klass word of the object's pre-image.
1125 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1126 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1127 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1128 }
1129 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1130 }
1131 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1132 }
1133 }
1134
1135 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1136 // sparc/solaris for certain applications, but would gain from
1137 // further optimization and tuning efforts, and would almost
1138 // certainly gain from analysis of platform and environment.
1139 void Arguments::set_cms_and_parnew_gc_flags() {
1140 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1141 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1142
1143 // If we are using CMS, we prefer to UseParNewGC,
1144 // unless explicitly forbidden.
1145 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1146 FLAG_SET_ERGO(bool, UseParNewGC, true);
1147 }
1148
1149 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1150 disable_adaptive_size_policy("UseConcMarkSweepGC");
1151
1152 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1153 // as needed.
1154 if (UseParNewGC) {
1155 set_parnew_gc_flags();
1156 }
1157
1158 // MaxHeapSize is aligned down in collectorPolicy
1159 size_t max_heap = align_size_down(MaxHeapSize,
1160 CardTableRS::ct_max_alignment_constraint());
1161
1162 // Now make adjustments for CMS
1163 intx tenuring_default = (intx)6;
1164 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1165
1166 // Preferred young gen size for "short" pauses:
1167 // upper bound depends on # of threads and NewRatio.
1168 const uintx parallel_gc_threads =
1169 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1170 const size_t preferred_max_new_size_unaligned =
1171 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1172 size_t preferred_max_new_size =
1173 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1174
1175 // Unless explicitly requested otherwise, size young gen
1176 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1177
1178 // If either MaxNewSize or NewRatio is set on the command line,
1179 // assume the user is trying to set the size of the young gen.
1180 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1181
1182 // Set MaxNewSize to our calculated preferred_max_new_size unless
1183 // NewSize was set on the command line and it is larger than
1184 // preferred_max_new_size.
1185 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1186 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1187 } else {
1188 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1189 }
1190 if (PrintGCDetails && Verbose) {
1191 // Too early to use gclog_or_tty
1192 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1193 }
1194
1195 // Code along this path potentially sets NewSize and OldSize
1196
1197 assert(max_heap >= InitialHeapSize, "Error");
1198 assert(max_heap >= NewSize, "Error");
1199
1200 if (PrintGCDetails && Verbose) {
1201 // Too early to use gclog_or_tty
1202 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1203 " initial_heap_size: " SIZE_FORMAT
1204 " max_heap: " SIZE_FORMAT,
1205 min_heap_size(), InitialHeapSize, max_heap);
1206 }
1207 size_t min_new = preferred_max_new_size;
1208 if (FLAG_IS_CMDLINE(NewSize)) {
1209 min_new = NewSize;
1210 }
1211 if (max_heap > min_new && min_heap_size() > min_new) {
1212 // Unless explicitly requested otherwise, make young gen
1213 // at least min_new, and at most preferred_max_new_size.
1214 if (FLAG_IS_DEFAULT(NewSize)) {
1215 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1216 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1217 if (PrintGCDetails && Verbose) {
1218 // Too early to use gclog_or_tty
1219 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1220 }
1221 }
1222 // Unless explicitly requested otherwise, size old gen
1223 // so it's NewRatio x of NewSize.
1224 if (FLAG_IS_DEFAULT(OldSize)) {
1225 if (max_heap > NewSize) {
1226 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1227 if (PrintGCDetails && Verbose) {
1228 // Too early to use gclog_or_tty
1229 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1230 }
1231 }
1232 }
1233 }
1234 }
1235 // Unless explicitly requested otherwise, definitely
1236 // promote all objects surviving "tenuring_default" scavenges.
1237 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1238 FLAG_IS_DEFAULT(SurvivorRatio)) {
1239 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1240 }
1241 // If we decided above (or user explicitly requested)
1242 // `promote all' (via MaxTenuringThreshold := 0),
1243 // prefer minuscule survivor spaces so as not to waste
1244 // space for (non-existent) survivors
1245 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1246 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1247 }
1248 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1249 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1250 // This is done in order to make ParNew+CMS configuration to work
1251 // with YoungPLABSize and OldPLABSize options.
1252 // See CR 6362902.
1253 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1254 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1255 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1256 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1257 // the value (either from the command line or ergonomics) of
1258 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1259 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1260 } else {
1261 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1262 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1263 // we'll let it to take precedence.
1264 jio_fprintf(defaultStream::error_stream(),
1265 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1266 " options are specified for the CMS collector."
1267 " CMSParPromoteBlocksToClaim will take precedence.\n");
1268 }
1269 }
1270 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1271 // OldPLAB sizing manually turned off: Use a larger default setting,
1272 // unless it was manually specified. This is because a too-low value
1273 // will slow down scavenges.
1274 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1275 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1276 }
1277 }
1278 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1279 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1280 // If either of the static initialization defaults have changed, note this
1281 // modification.
1282 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1283 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1284 }
1285 if (PrintGCDetails && Verbose) {
1286 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1287 MarkStackSize / K, MarkStackSizeMax / K);
1288 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1289 }
1290 }
1291 #endif // INCLUDE_ALTERNATE_GCS
1292
1293 void set_object_alignment() {
1294 // Object alignment.
1295 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1296 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1297 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1298 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1299 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1300 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1301
1302 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1303 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1304
1305 // Oop encoding heap max
1306 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1307
1308 #if INCLUDE_ALTERNATE_GCS
1309 // Set CMS global values
1310 CompactibleFreeListSpace::set_cms_values();
1311 #endif // INCLUDE_ALTERNATE_GCS
1312 }
1313
1314 bool verify_object_alignment() {
1315 // Object alignment.
1316 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1317 jio_fprintf(defaultStream::error_stream(),
1318 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1319 (int)ObjectAlignmentInBytes);
1320 return false;
1321 }
1322 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1323 jio_fprintf(defaultStream::error_stream(),
1324 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1325 (int)ObjectAlignmentInBytes, BytesPerLong);
1326 return false;
1327 }
1328 // It does not make sense to have big object alignment
1329 // since a space lost due to alignment will be greater
1330 // then a saved space from compressed oops.
1331 if ((int)ObjectAlignmentInBytes > 256) {
1332 jio_fprintf(defaultStream::error_stream(),
1333 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1334 (int)ObjectAlignmentInBytes);
1335 return false;
1336 }
1337 // In case page size is very small.
1338 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1339 jio_fprintf(defaultStream::error_stream(),
1340 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1341 (int)ObjectAlignmentInBytes, os::vm_page_size());
1342 return false;
1343 }
1344 return true;
1345 }
1346
1347 inline uintx max_heap_for_compressed_oops() {
1348 // Avoid sign flip.
1349 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) {
1350 return 0;
1351 }
1352 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size());
1353 NOT_LP64(ShouldNotReachHere(); return 0);
1354 }
1355
1356 bool Arguments::should_auto_select_low_pause_collector() {
1357 if (UseAutoGCSelectPolicy &&
1358 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1359 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1360 if (PrintGCDetails) {
1361 // Cannot use gclog_or_tty yet.
1362 tty->print_cr("Automatic selection of the low pause collector"
1363 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1364 }
1365 return true;
1366 }
1367 return false;
1368 }
1369
1370 void Arguments::set_ergonomics_flags() {
1371
1372 if (os::is_server_class_machine()) {
1373 // If no other collector is requested explicitly,
1374 // let the VM select the collector based on
1375 // machine class and automatic selection policy.
1376 if (!UseSerialGC &&
1377 !UseConcMarkSweepGC &&
1378 !UseG1GC &&
1379 !UseParNewGC &&
1380 FLAG_IS_DEFAULT(UseParallelGC)) {
1381 if (should_auto_select_low_pause_collector()) {
1382 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1383 } else {
1384 FLAG_SET_ERGO(bool, UseParallelGC, true);
1385 }
1386 }
1387 // Shared spaces work fine with other GCs but causes bytecode rewriting
1388 // to be disabled, which hurts interpreter performance and decreases
1389 // server performance. On server class machines, keep the default
1390 // off unless it is asked for. Future work: either add bytecode rewriting
1391 // at link time, or rewrite bytecodes in non-shared methods.
1392 if (!DumpSharedSpaces && !RequireSharedSpaces) {
1393 no_shared_spaces();
1394 }
1395 }
1396
1397 #ifndef ZERO
1398 #ifdef _LP64
1399 // Check that UseCompressedOops can be set with the max heap size allocated
1400 // by ergonomics.
1401 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1402 #if !defined(COMPILER1) || defined(TIERED)
1403 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1404 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1405 }
1406 #endif
1407 #ifdef _WIN64
1408 if (UseLargePages && UseCompressedOops) {
1409 // Cannot allocate guard pages for implicit checks in indexed addressing
1410 // mode, when large pages are specified on windows.
1411 // This flag could be switched ON if narrow oop base address is set to 0,
1412 // see code in Universe::initialize_heap().
1413 Universe::set_narrow_oop_use_implicit_null_checks(false);
1414 }
1415 #endif // _WIN64
1416 } else {
1417 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1418 warning("Max heap size too large for Compressed Oops");
1419 FLAG_SET_DEFAULT(UseCompressedOops, false);
1420 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1421 }
1422 }
1423 // UseCompressedOops must be on for UseCompressedKlassPointers to be on.
1424 if (!UseCompressedOops) {
1425 if (UseCompressedKlassPointers) {
1426 warning("UseCompressedKlassPointers requires UseCompressedOops");
1427 }
1428 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1429 } else {
1430 // Turn on UseCompressedKlassPointers too
1431 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) {
1432 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true);
1433 }
1434 // Set the ClassMetaspaceSize to something that will not need to be
1435 // expanded, since it cannot be expanded.
1436 if (UseCompressedKlassPointers && FLAG_IS_DEFAULT(ClassMetaspaceSize)) {
1437 // 100,000 classes seems like a good size, so 100M assumes around 1K
1438 // per klass. The vtable and oopMap is embedded so we don't have a fixed
1439 // size per klass. Eventually, this will be parameterized because it
1440 // would also be useful to determine the optimal size of the
1441 // systemDictionary.
1442 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M);
1443 }
1444 }
1445 // Also checks that certain machines are slower with compressed oops
1446 // in vm_version initialization code.
1447 #endif // _LP64
1448 #endif // !ZERO
1449 }
1450
1451 void Arguments::set_parallel_gc_flags() {
1452 assert(UseParallelGC || UseParallelOldGC, "Error");
1453 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1454 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1455 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1456 }
1457 FLAG_SET_DEFAULT(UseParallelGC, true);
1458
1459 // If no heap maximum was requested explicitly, use some reasonable fraction
1460 // of the physical memory, up to a maximum of 1GB.
1461 if (UseParallelGC) {
1462 FLAG_SET_DEFAULT(ParallelGCThreads,
1463 Abstract_VM_Version::parallel_worker_threads());
1464
1465 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1466 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1467 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1468 // See CR 6362902 for details.
1469 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1470 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1471 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1472 }
1473 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1474 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1475 }
1476 }
1477
1478 if (UseParallelOldGC) {
1479 // Par compact uses lower default values since they are treated as
1480 // minimums. These are different defaults because of the different
1481 // interpretation and are not ergonomically set.
1482 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1483 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1484 }
1485 }
1486 }
1487 if (UseNUMA) {
1488 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
1489 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
1490 }
1491 // For those collectors or operating systems (eg, Windows) that do
1492 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
1493 UseNUMAInterleaving = true;
1494 }
1495 }
1496
1497 void Arguments::set_g1_gc_flags() {
1498 assert(UseG1GC, "Error");
1499 #ifdef COMPILER1
1500 FastTLABRefill = false;
1501 #endif
1502 FLAG_SET_DEFAULT(ParallelGCThreads,
1503 Abstract_VM_Version::parallel_worker_threads());
1504 if (ParallelGCThreads == 0) {
1505 FLAG_SET_DEFAULT(ParallelGCThreads,
1506 Abstract_VM_Version::parallel_worker_threads());
1507 }
1508
1509 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1510 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1511 }
1512 if (PrintGCDetails && Verbose) {
1513 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1514 MarkStackSize / K, MarkStackSizeMax / K);
1515 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1516 }
1517
1518 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1519 // In G1, we want the default GC overhead goal to be higher than
1520 // say in PS. So we set it here to 10%. Otherwise the heap might
1521 // be expanded more aggressively than we would like it to. In
1522 // fact, even 10% seems to not be high enough in some cases
1523 // (especially small GC stress tests that the main thing they do
1524 // is allocation). We might consider increase it further.
1525 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1526 }
1527 }
1528
1529 void Arguments::set_heap_size() {
1530 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1531 // Deprecated flag
1532 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1533 }
1534
1535 const julong phys_mem =
1536 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1537 : (julong)MaxRAM;
1538
1539 // If the maximum heap size has not been set with -Xmx,
1540 // then set it as fraction of the size of physical memory,
1541 // respecting the maximum and minimum sizes of the heap.
1542 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1543 julong reasonable_max = phys_mem / MaxRAMFraction;
1544
1545 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1546 // Small physical memory, so use a minimum fraction of it for the heap
1547 reasonable_max = phys_mem / MinRAMFraction;
1548 } else {
1549 // Not-small physical memory, so require a heap at least
1550 // as large as MaxHeapSize
1551 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1552 }
1553 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1554 // Limit the heap size to ErgoHeapSizeLimit
1555 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1556 }
1557 if (UseCompressedOops) {
1558 // Limit the heap size to the maximum possible when using compressed oops
1559 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1560 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1561 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1562 // but it should be not less than default MaxHeapSize.
1563 max_coop_heap -= HeapBaseMinAddress;
1564 }
1565 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1566 }
1567 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1568
1569 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1570 // An initial heap size was specified on the command line,
1571 // so be sure that the maximum size is consistent. Done
1572 // after call to allocatable_physical_memory because that
1573 // method might reduce the allocation size.
1574 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1575 }
1576
1577 if (PrintGCDetails && Verbose) {
1578 // Cannot use gclog_or_tty yet.
1579 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1580 }
1581 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1582 }
1583
1584 // If the initial_heap_size has not been set with InitialHeapSize
1585 // or -Xms, then set it as fraction of the size of physical memory,
1586 // respecting the maximum and minimum sizes of the heap.
1587 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1588 julong reasonable_minimum = (julong)(OldSize + NewSize);
1589
1590 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1591
1592 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1593
1594 julong reasonable_initial = phys_mem / InitialRAMFraction;
1595
1596 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1597 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1598
1599 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1600
1601 if (PrintGCDetails && Verbose) {
1602 // Cannot use gclog_or_tty yet.
1603 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1604 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1605 }
1606 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1607 set_min_heap_size((uintx)reasonable_minimum);
1608 }
1609 }
1610
1611 // This must be called after ergonomics because we want bytecode rewriting
1612 // if the server compiler is used, or if UseSharedSpaces is disabled.
1613 void Arguments::set_bytecode_flags() {
1614 // Better not attempt to store into a read-only space.
1615 if (UseSharedSpaces) {
1616 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1617 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1618 }
1619
1620 if (!RewriteBytecodes) {
1621 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1622 }
1623 }
1624
1625 // Aggressive optimization flags -XX:+AggressiveOpts
1626 void Arguments::set_aggressive_opts_flags() {
1627 #ifdef COMPILER2
1628 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1629 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1630 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1631 }
1632 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1633 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1634 }
1635
1636 // Feed the cache size setting into the JDK
1637 char buffer[1024];
1638 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1639 add_property(buffer);
1640 }
1641 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1642 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1643 }
1644 #endif
1645
1646 if (AggressiveOpts) {
1647 // Sample flag setting code
1648 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1649 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1650 // }
1651 }
1652 }
1653
1654 //===========================================================================================================
1655 // Parsing of java.compiler property
1656
1657 void Arguments::process_java_compiler_argument(char* arg) {
1658 // For backwards compatibility, Djava.compiler=NONE or ""
1659 // causes us to switch to -Xint mode UNLESS -Xdebug
1660 // is also specified.
1661 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1662 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1663 }
1664 }
1665
1666 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1667 _sun_java_launcher = strdup(launcher);
1668 if (strcmp("gamma", _sun_java_launcher) == 0) {
1669 _created_by_gamma_launcher = true;
1670 }
1671 }
1672
1673 bool Arguments::created_by_java_launcher() {
1674 assert(_sun_java_launcher != NULL, "property must have value");
1675 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1676 }
1677
1678 bool Arguments::created_by_gamma_launcher() {
1679 return _created_by_gamma_launcher;
1680 }
1681
1682 //===========================================================================================================
1683 // Parsing of main arguments
1684
1685 bool Arguments::verify_interval(uintx val, uintx min,
1686 uintx max, const char* name) {
1687 // Returns true iff value is in the inclusive interval [min..max]
1688 // false, otherwise.
1689 if (val >= min && val <= max) {
1690 return true;
1691 }
1692 jio_fprintf(defaultStream::error_stream(),
1693 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1694 " and " UINTX_FORMAT "\n",
1695 name, val, min, max);
1696 return false;
1697 }
1698
1699 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1700 // Returns true if given value is at least specified min threshold
1701 // false, otherwise.
1702 if (val >= min ) {
1703 return true;
1704 }
1705 jio_fprintf(defaultStream::error_stream(),
1706 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1707 name, val, min);
1708 return false;
1709 }
1710
1711 bool Arguments::verify_percentage(uintx value, const char* name) {
1712 if (value <= 100) {
1713 return true;
1714 }
1715 jio_fprintf(defaultStream::error_stream(),
1716 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1717 name, value);
1718 return false;
1719 }
1720
1721 static void force_serial_gc() {
1722 FLAG_SET_DEFAULT(UseSerialGC, true);
1723 FLAG_SET_DEFAULT(UseParNewGC, false);
1724 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1725 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1726 FLAG_SET_DEFAULT(UseParallelGC, false);
1727 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1728 FLAG_SET_DEFAULT(UseG1GC, false);
1729 }
1730
1731 static bool verify_serial_gc_flags() {
1732 return (UseSerialGC &&
1733 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1734 UseParallelGC || UseParallelOldGC));
1735 }
1736
1737 // check if do gclog rotation
1738 // +UseGCLogFileRotation is a must,
1739 // no gc log rotation when log file not supplied or
1740 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1741 void check_gclog_consistency() {
1742 if (UseGCLogFileRotation) {
1743 if ((Arguments::gc_log_filename() == NULL) ||
1744 (NumberOfGCLogFiles == 0) ||
1745 (GCLogFileSize == 0)) {
1746 jio_fprintf(defaultStream::output_stream(),
1747 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1748 "where num_of_file > 0 and num_of_size > 0\n"
1749 "GC log rotation is turned off\n");
1750 UseGCLogFileRotation = false;
1751 }
1752 }
1753
1754 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1755 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1756 jio_fprintf(defaultStream::output_stream(),
1757 "GCLogFileSize changed to minimum 8K\n");
1758 }
1759 }
1760
1761 // Check consistency of GC selection
1762 bool Arguments::check_gc_consistency() {
1763 check_gclog_consistency();
1764 bool status = true;
1765 // Ensure that the user has not selected conflicting sets
1766 // of collectors. [Note: this check is merely a user convenience;
1767 // collectors over-ride each other so that only a non-conflicting
1768 // set is selected; however what the user gets is not what they
1769 // may have expected from the combination they asked for. It's
1770 // better to reduce user confusion by not allowing them to
1771 // select conflicting combinations.
1772 uint i = 0;
1773 if (UseSerialGC) i++;
1774 if (UseConcMarkSweepGC || UseParNewGC) i++;
1775 if (UseParallelGC || UseParallelOldGC) i++;
1776 if (UseG1GC) i++;
1777 if (i > 1) {
1778 jio_fprintf(defaultStream::error_stream(),
1779 "Conflicting collector combinations in option list; "
1780 "please refer to the release notes for the combinations "
1781 "allowed\n");
1782 status = false;
1783 }
1784
1785 return status;
1786 }
1787
1788 // Check stack pages settings
1789 bool Arguments::check_stack_pages()
1790 {
1791 bool status = true;
1792 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1793 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1794 // greater stack shadow pages can't generate instruction to bang stack
1795 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1796 return status;
1797 }
1798
1799 // Check the consistency of vm_init_args
1800 bool Arguments::check_vm_args_consistency() {
1801 // Method for adding checks for flag consistency.
1802 // The intent is to warn the user of all possible conflicts,
1803 // before returning an error.
1804 // Note: Needs platform-dependent factoring.
1805 bool status = true;
1806
1807 #if ( (defined(COMPILER2) && defined(SPARC)))
1808 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1809 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1810 // x86. Normally, VM_Version_init must be called from init_globals in
1811 // init.cpp, which is called by the initial java thread *after* arguments
1812 // have been parsed. VM_Version_init gets called twice on sparc.
1813 extern void VM_Version_init();
1814 VM_Version_init();
1815 if (!VM_Version::has_v9()) {
1816 jio_fprintf(defaultStream::error_stream(),
1817 "V8 Machine detected, Server requires V9\n");
1818 status = false;
1819 }
1820 #endif /* COMPILER2 && SPARC */
1821
1822 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1823 // builds so the cost of stack banging can be measured.
1824 #if (defined(PRODUCT) && defined(SOLARIS))
1825 if (!UseBoundThreads && !UseStackBanging) {
1826 jio_fprintf(defaultStream::error_stream(),
1827 "-UseStackBanging conflicts with -UseBoundThreads\n");
1828
1829 status = false;
1830 }
1831 #endif
1832
1833 if (TLABRefillWasteFraction == 0) {
1834 jio_fprintf(defaultStream::error_stream(),
1835 "TLABRefillWasteFraction should be a denominator, "
1836 "not " SIZE_FORMAT "\n",
1837 TLABRefillWasteFraction);
1838 status = false;
1839 }
1840
1841 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1842 "AdaptiveSizePolicyWeight");
1843 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1844 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1845 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1846
1847 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1848 jio_fprintf(defaultStream::error_stream(),
1849 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1850 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1851 MinHeapFreeRatio, MaxHeapFreeRatio);
1852 status = false;
1853 }
1854 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1855 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1856
1857 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1858 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1859 }
1860
1861 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1862 // Settings to encourage splitting.
1863 if (!FLAG_IS_CMDLINE(NewRatio)) {
1864 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1865 }
1866 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1867 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1868 }
1869 }
1870
1871 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1872 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1873 if (GCTimeLimit == 100) {
1874 // Turn off gc-overhead-limit-exceeded checks
1875 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1876 }
1877
1878 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1879
1880 status = status && check_gc_consistency();
1881 status = status && check_stack_pages();
1882
1883 if (_has_alloc_profile) {
1884 if (UseParallelGC || UseParallelOldGC) {
1885 jio_fprintf(defaultStream::error_stream(),
1886 "error: invalid argument combination.\n"
1887 "Allocation profiling (-Xaprof) cannot be used together with "
1888 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1889 status = false;
1890 }
1891 if (UseConcMarkSweepGC) {
1892 jio_fprintf(defaultStream::error_stream(),
1893 "error: invalid argument combination.\n"
1894 "Allocation profiling (-Xaprof) cannot be used together with "
1895 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1896 status = false;
1897 }
1898 }
1899
1900 if (CMSIncrementalMode) {
1901 if (!UseConcMarkSweepGC) {
1902 jio_fprintf(defaultStream::error_stream(),
1903 "error: invalid argument combination.\n"
1904 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1905 "selected in order\nto use CMSIncrementalMode.\n");
1906 status = false;
1907 } else {
1908 status = status && verify_percentage(CMSIncrementalDutyCycle,
1909 "CMSIncrementalDutyCycle");
1910 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1911 "CMSIncrementalDutyCycleMin");
1912 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1913 "CMSIncrementalSafetyFactor");
1914 status = status && verify_percentage(CMSIncrementalOffset,
1915 "CMSIncrementalOffset");
1916 status = status && verify_percentage(CMSExpAvgFactor,
1917 "CMSExpAvgFactor");
1918 // If it was not set on the command line, set
1919 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1920 if (CMSInitiatingOccupancyFraction < 0) {
1921 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1922 }
1923 }
1924 }
1925
1926 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1927 // insists that we hold the requisite locks so that the iteration is
1928 // MT-safe. For the verification at start-up and shut-down, we don't
1929 // yet have a good way of acquiring and releasing these locks,
1930 // which are not visible at the CollectedHeap level. We want to
1931 // be able to acquire these locks and then do the iteration rather
1932 // than just disable the lock verification. This will be fixed under
1933 // bug 4788986.
1934 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1935 if (VerifyGCStartAt == 0) {
1936 warning("Heap verification at start-up disabled "
1937 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1938 VerifyGCStartAt = 1; // Disable verification at start-up
1939 }
1940 if (VerifyBeforeExit) {
1941 warning("Heap verification at shutdown disabled "
1942 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1943 VerifyBeforeExit = false; // Disable verification at shutdown
1944 }
1945 }
1946
1947 // Note: only executed in non-PRODUCT mode
1948 if (!UseAsyncConcMarkSweepGC &&
1949 (ExplicitGCInvokesConcurrent ||
1950 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1951 jio_fprintf(defaultStream::error_stream(),
1952 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1953 " with -UseAsyncConcMarkSweepGC");
1954 status = false;
1955 }
1956
1957 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
1958
1959 #ifndef SERIALGC
1960 if (UseG1GC) {
1961 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1962 "InitiatingHeapOccupancyPercent");
1963 status = status && verify_min_value(G1RefProcDrainInterval, 1,
1964 "G1RefProcDrainInterval");
1965 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
1966 "G1ConcMarkStepDurationMillis");
1967 }
1968 #endif
1969
1970 status = status && verify_interval(RefDiscoveryPolicy,
1971 ReferenceProcessor::DiscoveryPolicyMin,
1972 ReferenceProcessor::DiscoveryPolicyMax,
1973 "RefDiscoveryPolicy");
1974
1975 // Limit the lower bound of this flag to 1 as it is used in a division
1976 // expression.
1977 status = status && verify_interval(TLABWasteTargetPercent,
1978 1, 100, "TLABWasteTargetPercent");
1979
1980 status = status && verify_object_alignment();
1981
1982 status = status && verify_min_value(ClassMetaspaceSize, 1*M,
1983 "ClassMetaspaceSize");
1984
1985 #ifdef SPARC
1986 if (UseConcMarkSweepGC || UseG1GC) {
1987 // Issue a stern warning if the user has explicitly set
1988 // UseMemSetInBOT (it is known to cause issues), but allow
1989 // use for experimentation and debugging.
1990 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
1991 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
1992 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
1993 " on sun4v; please understand that you are using at your own risk!");
1994 }
1995 }
1996 #endif // SPARC
1997
1998 if (PrintNMTStatistics) {
1999 #if INCLUDE_NMT
2000 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2001 #endif // INCLUDE_NMT
2002 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2003 PrintNMTStatistics = false;
2004 #if INCLUDE_NMT
2005 }
2006 #endif
2007 }
2008
2009 return status;
2010 }
2011
2012 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2013 const char* option_type) {
2014 if (ignore) return false;
2015
2016 const char* spacer = " ";
2017 if (option_type == NULL) {
2018 option_type = ++spacer; // Set both to the empty string.
2019 }
2020
2021 if (os::obsolete_option(option)) {
2022 jio_fprintf(defaultStream::error_stream(),
2023 "Obsolete %s%soption: %s\n", option_type, spacer,
2024 option->optionString);
2025 return false;
2026 } else {
2027 jio_fprintf(defaultStream::error_stream(),
2028 "Unrecognized %s%soption: %s\n", option_type, spacer,
2029 option->optionString);
2030 return true;
2031 }
2032 }
2033
2034 static const char* user_assertion_options[] = {
2035 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2036 };
2037
2038 static const char* system_assertion_options[] = {
2039 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2040 };
2041
2042 // Return true if any of the strings in null-terminated array 'names' matches.
2043 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2044 // the option must match exactly.
2045 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2046 bool tail_allowed) {
2047 for (/* empty */; *names != NULL; ++names) {
2048 if (match_option(option, *names, tail)) {
2049 if (**tail == '\0' || tail_allowed && **tail == ':') {
2050 return true;
2051 }
2052 }
2053 }
2054 return false;
2055 }
2056
2057 bool Arguments::parse_uintx(const char* value,
2058 uintx* uintx_arg,
2059 uintx min_size) {
2060
2061 // Check the sign first since atomull() parses only unsigned values.
2062 bool value_is_positive = !(*value == '-');
2063
2064 if (value_is_positive) {
2065 julong n;
2066 bool good_return = atomull(value, &n);
2067 if (good_return) {
2068 bool above_minimum = n >= min_size;
2069 bool value_is_too_large = n > max_uintx;
2070
2071 if (above_minimum && !value_is_too_large) {
2072 *uintx_arg = n;
2073 return true;
2074 }
2075 }
2076 }
2077 return false;
2078 }
2079
2080 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2081 julong* long_arg,
2082 julong min_size) {
2083 if (!atomull(s, long_arg)) return arg_unreadable;
2084 return check_memory_size(*long_arg, min_size);
2085 }
2086
2087 // Parse JavaVMInitArgs structure
2088
2089 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2090 // For components of the system classpath.
2091 SysClassPath scp(Arguments::get_sysclasspath());
2092 bool scp_assembly_required = false;
2093
2094 // Save default settings for some mode flags
2095 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2096 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2097 Arguments::_ClipInlining = ClipInlining;
2098 Arguments::_BackgroundCompilation = BackgroundCompilation;
2099
2100 // Setup flags for mixed which is the default
2101 set_mode_flags(_mixed);
2102
2103 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2104 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2105 if (result != JNI_OK) {
2106 return result;
2107 }
2108
2109 // Parse JavaVMInitArgs structure passed in
2110 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2111 if (result != JNI_OK) {
2112 return result;
2113 }
2114
2115 if (AggressiveOpts) {
2116 // Insert alt-rt.jar between user-specified bootclasspath
2117 // prefix and the default bootclasspath. os::set_boot_path()
2118 // uses meta_index_dir as the default bootclasspath directory.
2119 const char* altclasses_jar = "alt-rt.jar";
2120 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2121 strlen(altclasses_jar);
2122 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2123 strcpy(altclasses_path, get_meta_index_dir());
2124 strcat(altclasses_path, altclasses_jar);
2125 scp.add_suffix_to_prefix(altclasses_path);
2126 scp_assembly_required = true;
2127 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2128 }
2129
2130 if (WhiteBoxAPI) {
2131 // Append wb.jar to bootclasspath if enabled
2132 const char* wb_jar = "wb.jar";
2133 size_t wb_path_len = strlen(get_meta_index_dir()) + 1 +
2134 strlen(wb_jar);
2135 char* wb_path = NEW_C_HEAP_ARRAY(char, wb_path_len, mtInternal);
2136 strcpy(wb_path, get_meta_index_dir());
2137 strcat(wb_path, wb_jar);
2138 scp.add_suffix(wb_path);
2139 scp_assembly_required = true;
2140 FREE_C_HEAP_ARRAY(char, wb_path, mtInternal);
2141 }
2142
2143 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2144 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2145 if (result != JNI_OK) {
2146 return result;
2147 }
2148
2149 // Do final processing now that all arguments have been parsed
2150 result = finalize_vm_init_args(&scp, scp_assembly_required);
2151 if (result != JNI_OK) {
2152 return result;
2153 }
2154
2155 return JNI_OK;
2156 }
2157
2158 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2159 SysClassPath* scp_p,
2160 bool* scp_assembly_required_p,
2161 FlagValueOrigin origin) {
2162 // Remaining part of option string
2163 const char* tail;
2164
2165 // iterate over arguments
2166 for (int index = 0; index < args->nOptions; index++) {
2167 bool is_absolute_path = false; // for -agentpath vs -agentlib
2168
2169 const JavaVMOption* option = args->options + index;
2170
2171 if (!match_option(option, "-Djava.class.path", &tail) &&
2172 !match_option(option, "-Dsun.java.command", &tail) &&
2173 !match_option(option, "-Dsun.java.launcher", &tail)) {
2174
2175 // add all jvm options to the jvm_args string. This string
2176 // is used later to set the java.vm.args PerfData string constant.
2177 // the -Djava.class.path and the -Dsun.java.command options are
2178 // omitted from jvm_args string as each have their own PerfData
2179 // string constant object.
2180 build_jvm_args(option->optionString);
2181 }
2182
2183 // -verbose:[class/gc/jni]
2184 if (match_option(option, "-verbose", &tail)) {
2185 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2186 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2187 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2188 } else if (!strcmp(tail, ":gc")) {
2189 FLAG_SET_CMDLINE(bool, PrintGC, true);
2190 } else if (!strcmp(tail, ":jni")) {
2191 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2192 }
2193 // -da / -ea / -disableassertions / -enableassertions
2194 // These accept an optional class/package name separated by a colon, e.g.,
2195 // -da:java.lang.Thread.
2196 } else if (match_option(option, user_assertion_options, &tail, true)) {
2197 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2198 if (*tail == '\0') {
2199 JavaAssertions::setUserClassDefault(enable);
2200 } else {
2201 assert(*tail == ':', "bogus match by match_option()");
2202 JavaAssertions::addOption(tail + 1, enable);
2203 }
2204 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2205 } else if (match_option(option, system_assertion_options, &tail, false)) {
2206 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2207 JavaAssertions::setSystemClassDefault(enable);
2208 // -bootclasspath:
2209 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2210 scp_p->reset_path(tail);
2211 *scp_assembly_required_p = true;
2212 // -bootclasspath/a:
2213 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2214 scp_p->add_suffix(tail);
2215 *scp_assembly_required_p = true;
2216 // -bootclasspath/p:
2217 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2218 scp_p->add_prefix(tail);
2219 *scp_assembly_required_p = true;
2220 // -Xrun
2221 } else if (match_option(option, "-Xrun", &tail)) {
2222 if (tail != NULL) {
2223 const char* pos = strchr(tail, ':');
2224 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2225 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2226 name[len] = '\0';
2227
2228 char *options = NULL;
2229 if(pos != NULL) {
2230 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2231 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2232 }
2233 #if !INCLUDE_JVMTI
2234 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2235 warning("profiling and debugging agents are not supported in this VM");
2236 } else
2237 #endif // !INCLUDE_JVMTI
2238 add_init_library(name, options);
2239 }
2240 // -agentlib and -agentpath
2241 } else if (match_option(option, "-agentlib:", &tail) ||
2242 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2243 if(tail != NULL) {
2244 const char* pos = strchr(tail, '=');
2245 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2246 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2247 name[len] = '\0';
2248
2249 char *options = NULL;
2250 if(pos != NULL) {
2251 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2252 }
2253 #if !INCLUDE_JVMTI
2254 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2255 warning("profiling and debugging agents are not supported in this VM");
2256 } else
2257 #endif // !INCLUDE_JVMTI
2258 add_init_agent(name, options, is_absolute_path);
2259
2260 }
2261 // -javaagent
2262 } else if (match_option(option, "-javaagent:", &tail)) {
2263 #if !INCLUDE_JVMTI
2264 warning("Instrumentation agents are not supported in this VM");
2265 #else
2266 if(tail != NULL) {
2267 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2268 add_init_agent("instrument", options, false);
2269 }
2270 #endif // !INCLUDE_JVMTI
2271 // -Xnoclassgc
2272 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2273 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2274 // -Xincgc: i-CMS
2275 } else if (match_option(option, "-Xincgc", &tail)) {
2276 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2277 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2278 // -Xnoincgc: no i-CMS
2279 } else if (match_option(option, "-Xnoincgc", &tail)) {
2280 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2281 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2282 // -Xconcgc
2283 } else if (match_option(option, "-Xconcgc", &tail)) {
2284 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2285 // -Xnoconcgc
2286 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2287 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2288 // -Xbatch
2289 } else if (match_option(option, "-Xbatch", &tail)) {
2290 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2291 // -Xmn for compatibility with other JVM vendors
2292 } else if (match_option(option, "-Xmn", &tail)) {
2293 julong long_initial_eden_size = 0;
2294 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2295 if (errcode != arg_in_range) {
2296 jio_fprintf(defaultStream::error_stream(),
2297 "Invalid initial eden size: %s\n", option->optionString);
2298 describe_range_error(errcode);
2299 return JNI_EINVAL;
2300 }
2301 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2302 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2303 // -Xms
2304 } else if (match_option(option, "-Xms", &tail)) {
2305 julong long_initial_heap_size = 0;
2306 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2307 if (errcode != arg_in_range) {
2308 jio_fprintf(defaultStream::error_stream(),
2309 "Invalid initial heap size: %s\n", option->optionString);
2310 describe_range_error(errcode);
2311 return JNI_EINVAL;
2312 }
2313 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2314 // Currently the minimum size and the initial heap sizes are the same.
2315 set_min_heap_size(InitialHeapSize);
2316 // -Xmx
2317 } else if (match_option(option, "-Xmx", &tail)) {
2318 julong long_max_heap_size = 0;
2319 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2320 if (errcode != arg_in_range) {
2321 jio_fprintf(defaultStream::error_stream(),
2322 "Invalid maximum heap size: %s\n", option->optionString);
2323 describe_range_error(errcode);
2324 return JNI_EINVAL;
2325 }
2326 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2327 // Xmaxf
2328 } else if (match_option(option, "-Xmaxf", &tail)) {
2329 int maxf = (int)(atof(tail) * 100);
2330 if (maxf < 0 || maxf > 100) {
2331 jio_fprintf(defaultStream::error_stream(),
2332 "Bad max heap free percentage size: %s\n",
2333 option->optionString);
2334 return JNI_EINVAL;
2335 } else {
2336 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2337 }
2338 // Xminf
2339 } else if (match_option(option, "-Xminf", &tail)) {
2340 int minf = (int)(atof(tail) * 100);
2341 if (minf < 0 || minf > 100) {
2342 jio_fprintf(defaultStream::error_stream(),
2343 "Bad min heap free percentage size: %s\n",
2344 option->optionString);
2345 return JNI_EINVAL;
2346 } else {
2347 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2348 }
2349 // -Xss
2350 } else if (match_option(option, "-Xss", &tail)) {
2351 julong long_ThreadStackSize = 0;
2352 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2353 if (errcode != arg_in_range) {
2354 jio_fprintf(defaultStream::error_stream(),
2355 "Invalid thread stack size: %s\n", option->optionString);
2356 describe_range_error(errcode);
2357 return JNI_EINVAL;
2358 }
2359 // Internally track ThreadStackSize in units of 1024 bytes.
2360 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2361 round_to((int)long_ThreadStackSize, K) / K);
2362 // -Xoss
2363 } else if (match_option(option, "-Xoss", &tail)) {
2364 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2365 // -Xmaxjitcodesize
2366 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2367 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2368 julong long_ReservedCodeCacheSize = 0;
2369 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2370 (size_t)InitialCodeCacheSize);
2371 if (errcode != arg_in_range) {
2372 jio_fprintf(defaultStream::error_stream(),
2373 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2374 option->optionString, InitialCodeCacheSize/K);
2375 describe_range_error(errcode);
2376 return JNI_EINVAL;
2377 }
2378 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2379 // -green
2380 } else if (match_option(option, "-green", &tail)) {
2381 jio_fprintf(defaultStream::error_stream(),
2382 "Green threads support not available\n");
2383 return JNI_EINVAL;
2384 // -native
2385 } else if (match_option(option, "-native", &tail)) {
2386 // HotSpot always uses native threads, ignore silently for compatibility
2387 // -Xsqnopause
2388 } else if (match_option(option, "-Xsqnopause", &tail)) {
2389 // EVM option, ignore silently for compatibility
2390 // -Xrs
2391 } else if (match_option(option, "-Xrs", &tail)) {
2392 // Classic/EVM option, new functionality
2393 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2394 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2395 // change default internal VM signals used - lower case for back compat
2396 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2397 // -Xoptimize
2398 } else if (match_option(option, "-Xoptimize", &tail)) {
2399 // EVM option, ignore silently for compatibility
2400 // -Xprof
2401 } else if (match_option(option, "-Xprof", &tail)) {
2402 #if INCLUDE_FPROF
2403 _has_profile = true;
2404 #else // INCLUDE_FPROF
2405 // do we have to exit?
2406 warning("Flat profiling is not supported in this VM.");
2407 #endif // INCLUDE_FPROF
2408 // -Xaprof
2409 } else if (match_option(option, "-Xaprof", &tail)) {
2410 _has_alloc_profile = true;
2411 // -Xconcurrentio
2412 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2413 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2414 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2415 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2416 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2417 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2418
2419 // -Xinternalversion
2420 } else if (match_option(option, "-Xinternalversion", &tail)) {
2421 jio_fprintf(defaultStream::output_stream(), "%s\n",
2422 VM_Version::internal_vm_info_string());
2423 vm_exit(0);
2424 #ifndef PRODUCT
2425 // -Xprintflags
2426 } else if (match_option(option, "-Xprintflags", &tail)) {
2427 CommandLineFlags::printFlags(tty, false);
2428 vm_exit(0);
2429 #endif
2430 // -D
2431 } else if (match_option(option, "-D", &tail)) {
2432 if (!add_property(tail)) {
2433 return JNI_ENOMEM;
2434 }
2435 // Out of the box management support
2436 if (match_option(option, "-Dcom.sun.management", &tail)) {
2437 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2438 }
2439 // -Xint
2440 } else if (match_option(option, "-Xint", &tail)) {
2441 set_mode_flags(_int);
2442 // -Xmixed
2443 } else if (match_option(option, "-Xmixed", &tail)) {
2444 set_mode_flags(_mixed);
2445 // -Xcomp
2446 } else if (match_option(option, "-Xcomp", &tail)) {
2447 // for testing the compiler; turn off all flags that inhibit compilation
2448 set_mode_flags(_comp);
2449
2450 // -Xshare:dump
2451 } else if (match_option(option, "-Xshare:dump", &tail)) {
2452 #if defined(KERNEL)
2453 vm_exit_during_initialization(
2454 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2455 #elif !INCLUDE_CDS
2456 vm_exit_during_initialization(
2457 "Dumping a shared archive is not supported in this VM.", NULL);
2458 #else
2459 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2460 set_mode_flags(_int); // Prevent compilation, which creates objects
2461 #endif
2462 // -Xshare:on
2463 } else if (match_option(option, "-Xshare:on", &tail)) {
2464 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2465 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2466 // -Xshare:auto
2467 } else if (match_option(option, "-Xshare:auto", &tail)) {
2468 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2469 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2470 // -Xshare:off
2471 } else if (match_option(option, "-Xshare:off", &tail)) {
2472 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2473 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2474
2475 // -Xverify
2476 } else if (match_option(option, "-Xverify", &tail)) {
2477 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2478 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2479 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2480 } else if (strcmp(tail, ":remote") == 0) {
2481 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2482 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2483 } else if (strcmp(tail, ":none") == 0) {
2484 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2485 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2486 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2487 return JNI_EINVAL;
2488 }
2489 // -Xdebug
2490 } else if (match_option(option, "-Xdebug", &tail)) {
2491 // note this flag has been used, then ignore
2492 set_xdebug_mode(true);
2493 // -Xnoagent
2494 } else if (match_option(option, "-Xnoagent", &tail)) {
2495 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2496 } else if (match_option(option, "-Xboundthreads", &tail)) {
2497 // Bind user level threads to kernel threads (Solaris only)
2498 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2499 } else if (match_option(option, "-Xloggc:", &tail)) {
2500 // Redirect GC output to the file. -Xloggc:<filename>
2501 // ostream_init_log(), when called will use this filename
2502 // to initialize a fileStream.
2503 _gc_log_filename = strdup(tail);
2504 FLAG_SET_CMDLINE(bool, PrintGC, true);
2505 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2506
2507 // JNI hooks
2508 } else if (match_option(option, "-Xcheck", &tail)) {
2509 if (!strcmp(tail, ":jni")) {
2510 #if !INCLUDE_JNI_CHECK
2511 warning("JNI CHECKING is not supported in this VM");
2512 #else
2513 CheckJNICalls = true;
2514 #endif // INCLUDE_JNI_CHECK
2515 } else if (is_bad_option(option, args->ignoreUnrecognized,
2516 "check")) {
2517 return JNI_EINVAL;
2518 }
2519 } else if (match_option(option, "vfprintf", &tail)) {
2520 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2521 } else if (match_option(option, "exit", &tail)) {
2522 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2523 } else if (match_option(option, "abort", &tail)) {
2524 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2525 // -XX:+AggressiveHeap
2526 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2527
2528 // This option inspects the machine and attempts to set various
2529 // parameters to be optimal for long-running, memory allocation
2530 // intensive jobs. It is intended for machines with large
2531 // amounts of cpu and memory.
2532
2533 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2534 // VM, but we may not be able to represent the total physical memory
2535 // available (like having 8gb of memory on a box but using a 32bit VM).
2536 // Thus, we need to make sure we're using a julong for intermediate
2537 // calculations.
2538 julong initHeapSize;
2539 julong total_memory = os::physical_memory();
2540
2541 if (total_memory < (julong)256*M) {
2542 jio_fprintf(defaultStream::error_stream(),
2543 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2544 vm_exit(1);
2545 }
2546
2547 // The heap size is half of available memory, or (at most)
2548 // all of possible memory less 160mb (leaving room for the OS
2549 // when using ISM). This is the maximum; because adaptive sizing
2550 // is turned on below, the actual space used may be smaller.
2551
2552 initHeapSize = MIN2(total_memory / (julong)2,
2553 total_memory - (julong)160*M);
2554
2555 // Make sure that if we have a lot of memory we cap the 32 bit
2556 // process space. The 64bit VM version of this function is a nop.
2557 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2558
2559 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2560 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2561 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2562 // Currently the minimum size and the initial heap sizes are the same.
2563 set_min_heap_size(initHeapSize);
2564 }
2565 if (FLAG_IS_DEFAULT(NewSize)) {
2566 // Make the young generation 3/8ths of the total heap.
2567 FLAG_SET_CMDLINE(uintx, NewSize,
2568 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2569 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2570 }
2571
2572 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2573 FLAG_SET_DEFAULT(UseLargePages, true);
2574 #endif
2575
2576 // Increase some data structure sizes for efficiency
2577 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2578 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2579 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2580
2581 // See the OldPLABSize comment below, but replace 'after promotion'
2582 // with 'after copying'. YoungPLABSize is the size of the survivor
2583 // space per-gc-thread buffers. The default is 4kw.
2584 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2585
2586 // OldPLABSize is the size of the buffers in the old gen that
2587 // UseParallelGC uses to promote live data that doesn't fit in the
2588 // survivor spaces. At any given time, there's one for each gc thread.
2589 // The default size is 1kw. These buffers are rarely used, since the
2590 // survivor spaces are usually big enough. For specjbb, however, there
2591 // are occasions when there's lots of live data in the young gen
2592 // and we end up promoting some of it. We don't have a definite
2593 // explanation for why bumping OldPLABSize helps, but the theory
2594 // is that a bigger PLAB results in retaining something like the
2595 // original allocation order after promotion, which improves mutator
2596 // locality. A minor effect may be that larger PLABs reduce the
2597 // number of PLAB allocation events during gc. The value of 8kw
2598 // was arrived at by experimenting with specjbb.
2599 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2600
2601 // Enable parallel GC and adaptive generation sizing
2602 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2603 FLAG_SET_DEFAULT(ParallelGCThreads,
2604 Abstract_VM_Version::parallel_worker_threads());
2605
2606 // Encourage steady state memory management
2607 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2608
2609 // This appears to improve mutator locality
2610 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2611
2612 // Get around early Solaris scheduling bug
2613 // (affinity vs other jobs on system)
2614 // but disallow DR and offlining (5008695).
2615 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2616
2617 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2618 // The last option must always win.
2619 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2620 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2621 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2622 // The last option must always win.
2623 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2624 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2625 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2626 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2627 jio_fprintf(defaultStream::error_stream(),
2628 "Please use CMSClassUnloadingEnabled in place of "
2629 "CMSPermGenSweepingEnabled in the future\n");
2630 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2631 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2632 jio_fprintf(defaultStream::error_stream(),
2633 "Please use -XX:+UseGCOverheadLimit in place of "
2634 "-XX:+UseGCTimeLimit in the future\n");
2635 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2636 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2637 jio_fprintf(defaultStream::error_stream(),
2638 "Please use -XX:-UseGCOverheadLimit in place of "
2639 "-XX:-UseGCTimeLimit in the future\n");
2640 // The TLE options are for compatibility with 1.3 and will be
2641 // removed without notice in a future release. These options
2642 // are not to be documented.
2643 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2644 // No longer used.
2645 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2646 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2647 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2648 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2649 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2650 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2651 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2652 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2653 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2654 // No longer used.
2655 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2656 julong long_tlab_size = 0;
2657 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2658 if (errcode != arg_in_range) {
2659 jio_fprintf(defaultStream::error_stream(),
2660 "Invalid TLAB size: %s\n", option->optionString);
2661 describe_range_error(errcode);
2662 return JNI_EINVAL;
2663 }
2664 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2665 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2666 // No longer used.
2667 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2668 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2669 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2670 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2671 SOLARIS_ONLY(
2672 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2673 warning("-XX:+UsePermISM is obsolete.");
2674 FLAG_SET_CMDLINE(bool, UseISM, true);
2675 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2676 FLAG_SET_CMDLINE(bool, UseISM, false);
2677 )
2678 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2679 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2680 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2681 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2682 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2683 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2684 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2685 #if defined(DTRACE_ENABLED)
2686 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2687 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2688 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2689 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2690 #else // defined(DTRACE_ENABLED)
2691 jio_fprintf(defaultStream::error_stream(),
2692 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2693 return JNI_EINVAL;
2694 #endif // defined(DTRACE_ENABLED)
2695 #ifdef ASSERT
2696 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2697 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2698 // disable scavenge before parallel mark-compact
2699 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2700 #endif
2701 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2702 julong cms_blocks_to_claim = (julong)atol(tail);
2703 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2704 jio_fprintf(defaultStream::error_stream(),
2705 "Please use -XX:OldPLABSize in place of "
2706 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2707 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2708 julong cms_blocks_to_claim = (julong)atol(tail);
2709 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2710 jio_fprintf(defaultStream::error_stream(),
2711 "Please use -XX:OldPLABSize in place of "
2712 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2713 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2714 julong old_plab_size = 0;
2715 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2716 if (errcode != arg_in_range) {
2717 jio_fprintf(defaultStream::error_stream(),
2718 "Invalid old PLAB size: %s\n", option->optionString);
2719 describe_range_error(errcode);
2720 return JNI_EINVAL;
2721 }
2722 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2723 jio_fprintf(defaultStream::error_stream(),
2724 "Please use -XX:OldPLABSize in place of "
2725 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2726 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2727 julong young_plab_size = 0;
2728 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2729 if (errcode != arg_in_range) {
2730 jio_fprintf(defaultStream::error_stream(),
2731 "Invalid young PLAB size: %s\n", option->optionString);
2732 describe_range_error(errcode);
2733 return JNI_EINVAL;
2734 }
2735 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2736 jio_fprintf(defaultStream::error_stream(),
2737 "Please use -XX:YoungPLABSize in place of "
2738 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2739 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2740 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2741 julong stack_size = 0;
2742 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2743 if (errcode != arg_in_range) {
2744 jio_fprintf(defaultStream::error_stream(),
2745 "Invalid mark stack size: %s\n", option->optionString);
2746 describe_range_error(errcode);
2747 return JNI_EINVAL;
2748 }
2749 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2750 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2751 julong max_stack_size = 0;
2752 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2753 if (errcode != arg_in_range) {
2754 jio_fprintf(defaultStream::error_stream(),
2755 "Invalid maximum mark stack size: %s\n",
2756 option->optionString);
2757 describe_range_error(errcode);
2758 return JNI_EINVAL;
2759 }
2760 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2761 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2762 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2763 uintx conc_threads = 0;
2764 if (!parse_uintx(tail, &conc_threads, 1)) {
2765 jio_fprintf(defaultStream::error_stream(),
2766 "Invalid concurrent threads: %s\n", option->optionString);
2767 return JNI_EINVAL;
2768 }
2769 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2770 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
2771 julong max_direct_memory_size = 0;
2772 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
2773 if (errcode != arg_in_range) {
2774 jio_fprintf(defaultStream::error_stream(),
2775 "Invalid maximum direct memory size: %s\n",
2776 option->optionString);
2777 describe_range_error(errcode);
2778 return JNI_EINVAL;
2779 }
2780 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
2781 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
2782 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
2783 // away and will cause VM initialization failures!
2784 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
2785 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
2786 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2787 // Skip -XX:Flags= since that case has already been handled
2788 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2789 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2790 return JNI_EINVAL;
2791 }
2792 }
2793 // Unknown option
2794 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2795 return JNI_ERR;
2796 }
2797 }
2798
2799 // Change the default value for flags which have different default values
2800 // when working with older JDKs.
2801 #ifdef LINUX
2802 if (JDK_Version::current().compare_major(6) <= 0 &&
2803 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2804 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2805 }
2806 #endif // LINUX
2807 return JNI_OK;
2808 }
2809
2810 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2811 // This must be done after all -D arguments have been processed.
2812 scp_p->expand_endorsed();
2813
2814 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2815 // Assemble the bootclasspath elements into the final path.
2816 Arguments::set_sysclasspath(scp_p->combined_path());
2817 }
2818
2819 // This must be done after all arguments have been processed.
2820 // java_compiler() true means set to "NONE" or empty.
2821 if (java_compiler() && !xdebug_mode()) {
2822 // For backwards compatibility, we switch to interpreted mode if
2823 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2824 // not specified.
2825 set_mode_flags(_int);
2826 }
2827 if (CompileThreshold == 0) {
2828 set_mode_flags(_int);
2829 }
2830
2831 #ifndef COMPILER2
2832 // Don't degrade server performance for footprint
2833 if (FLAG_IS_DEFAULT(UseLargePages) &&
2834 MaxHeapSize < LargePageHeapSizeThreshold) {
2835 // No need for large granularity pages w/small heaps.
2836 // Note that large pages are enabled/disabled for both the
2837 // Java heap and the code cache.
2838 FLAG_SET_DEFAULT(UseLargePages, false);
2839 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2840 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2841 }
2842
2843 // Tiered compilation is undefined with C1.
2844 TieredCompilation = false;
2845 #else
2846 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2847 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2848 }
2849 #endif
2850
2851 // If we are running in a headless jre, force java.awt.headless property
2852 // to be true unless the property has already been set.
2853 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2854 if (os::is_headless_jre()) {
2855 const char* headless = Arguments::get_property("java.awt.headless");
2856 if (headless == NULL) {
2857 char envbuffer[128];
2858 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2859 if (!add_property("java.awt.headless=true")) {
2860 return JNI_ENOMEM;
2861 }
2862 } else {
2863 char buffer[256];
2864 strcpy(buffer, "java.awt.headless=");
2865 strcat(buffer, envbuffer);
2866 if (!add_property(buffer)) {
2867 return JNI_ENOMEM;
2868 }
2869 }
2870 }
2871 }
2872
2873 if (!check_vm_args_consistency()) {
2874 return JNI_ERR;
2875 }
2876
2877 return JNI_OK;
2878 }
2879
2880 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2881 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2882 scp_assembly_required_p);
2883 }
2884
2885 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2886 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2887 scp_assembly_required_p);
2888 }
2889
2890 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2891 const int N_MAX_OPTIONS = 64;
2892 const int OPTION_BUFFER_SIZE = 1024;
2893 char buffer[OPTION_BUFFER_SIZE];
2894
2895 // The variable will be ignored if it exceeds the length of the buffer.
2896 // Don't check this variable if user has special privileges
2897 // (e.g. unix su command).
2898 if (os::getenv(name, buffer, sizeof(buffer)) &&
2899 !os::have_special_privileges()) {
2900 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2901 jio_fprintf(defaultStream::error_stream(),
2902 "Picked up %s: %s\n", name, buffer);
2903 char* rd = buffer; // pointer to the input string (rd)
2904 int i;
2905 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2906 while (isspace(*rd)) rd++; // skip whitespace
2907 if (*rd == 0) break; // we re done when the input string is read completely
2908
2909 // The output, option string, overwrites the input string.
2910 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2911 // input string (rd).
2912 char* wrt = rd;
2913
2914 options[i++].optionString = wrt; // Fill in option
2915 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2916 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2917 int quote = *rd; // matching quote to look for
2918 rd++; // don't copy open quote
2919 while (*rd != quote) { // include everything (even spaces) up until quote
2920 if (*rd == 0) { // string termination means unmatched string
2921 jio_fprintf(defaultStream::error_stream(),
2922 "Unmatched quote in %s\n", name);
2923 return JNI_ERR;
2924 }
2925 *wrt++ = *rd++; // copy to option string
2926 }
2927 rd++; // don't copy close quote
2928 } else {
2929 *wrt++ = *rd++; // copy to option string
2930 }
2931 }
2932 // Need to check if we're done before writing a NULL,
2933 // because the write could be to the byte that rd is pointing to.
2934 if (*rd++ == 0) {
2935 *wrt = 0;
2936 break;
2937 }
2938 *wrt = 0; // Zero terminate option
2939 }
2940 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2941 JavaVMInitArgs vm_args;
2942 vm_args.version = JNI_VERSION_1_2;
2943 vm_args.options = options;
2944 vm_args.nOptions = i;
2945 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2946
2947 if (PrintVMOptions) {
2948 const char* tail;
2949 for (int i = 0; i < vm_args.nOptions; i++) {
2950 const JavaVMOption *option = vm_args.options + i;
2951 if (match_option(option, "-XX:", &tail)) {
2952 logOption(tail);
2953 }
2954 }
2955 }
2956
2957 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2958 }
2959 return JNI_OK;
2960 }
2961
2962 void Arguments::set_shared_spaces_flags() {
2963 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
2964 const bool might_share = must_share || UseSharedSpaces;
2965
2966 // CompressedOops cannot be used with CDS. The offsets of oopmaps and
2967 // static fields are incorrect in the archive. With some more clever
2968 // initialization, this restriction can probably be lifted.
2969 // ??? UseLargePages might be okay now
2970 const bool cannot_share = UseCompressedOops ||
2971 (UseLargePages && FLAG_IS_CMDLINE(UseLargePages));
2972 if (cannot_share) {
2973 if (must_share) {
2974 warning("disabling large pages %s"
2975 "because of %s", "" LP64_ONLY("and compressed oops "),
2976 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
2977 FLAG_SET_CMDLINE(bool, UseLargePages, false);
2978 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
2979 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false));
2980 } else {
2981 // Prefer compressed oops and large pages to class data sharing
2982 if (UseSharedSpaces && Verbose) {
2983 warning("turning off use of shared archive because of large pages%s",
2984 "" LP64_ONLY(" and/or compressed oops"));
2985 }
2986 no_shared_spaces();
2987 }
2988 } else if (UseLargePages && might_share) {
2989 // Disable large pages to allow shared spaces. This is sub-optimal, since
2990 // there may not even be a shared archive to use.
2991 FLAG_SET_DEFAULT(UseLargePages, false);
2992 }
2993
2994 // Add 2M to any size for SharedReadOnlySize to get around the JPRT setting
2995 if (DumpSharedSpaces && !FLAG_IS_DEFAULT(SharedReadOnlySize)) {
2996 SharedReadOnlySize = 14*M;
2997 }
2998
2999 if (DumpSharedSpaces) {
3000 if (RequireSharedSpaces) {
3001 warning("cannot dump shared archive while using shared archive");
3002 }
3003 UseSharedSpaces = false;
3004 }
3005 }
3006
3007 // Disable options not supported in this release, with a warning if they
3008 // were explicitly requested on the command-line
3009 #define UNSUPPORTED_OPTION(opt, description) \
3010 do { \
3011 if (opt) { \
3012 if (FLAG_IS_CMDLINE(opt)) { \
3013 warning(description " is disabled in this release."); \
3014 } \
3015 FLAG_SET_DEFAULT(opt, false); \
3016 } \
3017 } while(0)
3018
3019 // Parse entry point called from JNI_CreateJavaVM
3020
3021 jint Arguments::parse(const JavaVMInitArgs* args) {
3022
3023 // Sharing support
3024 // Construct the path to the archive
3025 char jvm_path[JVM_MAXPATHLEN];
3026 os::jvm_path(jvm_path, sizeof(jvm_path));
3027 char *end = strrchr(jvm_path, *os::file_separator());
3028 if (end != NULL) *end = '\0';
3029 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
3030 strlen(os::file_separator()) + 20, mtInternal);
3031 if (shared_archive_path == NULL) return JNI_ENOMEM;
3032 strcpy(shared_archive_path, jvm_path);
3033 strcat(shared_archive_path, os::file_separator());
3034 strcat(shared_archive_path, "classes");
3035 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
3036 strcat(shared_archive_path, ".jsa");
3037 SharedArchivePath = shared_archive_path;
3038
3039 // Remaining part of option string
3040 const char* tail;
3041
3042 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3043 const char* hotspotrc = ".hotspotrc";
3044 bool settings_file_specified = false;
3045 bool needs_hotspotrc_warning = false;
3046
3047 const char* flags_file;
3048 int index;
3049 for (index = 0; index < args->nOptions; index++) {
3050 const JavaVMOption *option = args->options + index;
3051 if (match_option(option, "-XX:Flags=", &tail)) {
3052 flags_file = tail;
3053 settings_file_specified = true;
3054 }
3055 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3056 PrintVMOptions = true;
3057 }
3058 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3059 PrintVMOptions = false;
3060 }
3061 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3062 IgnoreUnrecognizedVMOptions = true;
3063 }
3064 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3065 IgnoreUnrecognizedVMOptions = false;
3066 }
3067 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3068 CommandLineFlags::printFlags(tty, false);
3069 vm_exit(0);
3070 }
3071 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3072 #if INCLUDE_NMT
3073 MemTracker::init_tracking_options(tail);
3074 #else
3075 warning("Native Memory Tracking is not supported in this VM");
3076 #endif
3077 }
3078
3079
3080 #ifndef PRODUCT
3081 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3082 CommandLineFlags::printFlags(tty, true);
3083 vm_exit(0);
3084 }
3085 #endif
3086 }
3087
3088 if (IgnoreUnrecognizedVMOptions) {
3089 // uncast const to modify the flag args->ignoreUnrecognized
3090 *(jboolean*)(&args->ignoreUnrecognized) = true;
3091 }
3092
3093 // Parse specified settings file
3094 if (settings_file_specified) {
3095 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3096 return JNI_EINVAL;
3097 }
3098 } else {
3099 #ifdef ASSERT
3100 // Parse default .hotspotrc settings file
3101 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3102 return JNI_EINVAL;
3103 }
3104 #else
3105 struct stat buf;
3106 if (os::stat(hotspotrc, &buf) == 0) {
3107 needs_hotspotrc_warning = true;
3108 }
3109 #endif
3110 }
3111
3112 if (PrintVMOptions) {
3113 for (index = 0; index < args->nOptions; index++) {
3114 const JavaVMOption *option = args->options + index;
3115 if (match_option(option, "-XX:", &tail)) {
3116 logOption(tail);
3117 }
3118 }
3119 }
3120
3121 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3122 jint result = parse_vm_init_args(args);
3123 if (result != JNI_OK) {
3124 return result;
3125 }
3126
3127 // Delay warning until here so that we've had a chance to process
3128 // the -XX:-PrintWarnings flag
3129 if (needs_hotspotrc_warning) {
3130 warning("%s file is present but has been ignored. "
3131 "Run with -XX:Flags=%s to load the file.",
3132 hotspotrc, hotspotrc);
3133 }
3134
3135 #if (defined JAVASE_EMBEDDED || defined ARM)
3136 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3137 #endif
3138
3139 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3140 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3141 #endif
3142
3143 #if !INCLUDE_ALTERNATE_GCS
3144 if (UseParallelGC) {
3145 warning("Parallel GC is not supported in this VM. Using Serial GC.");
3146 }
3147 if (UseParallelOldGC) {
3148 warning("Parallel Old GC is not supported in this VM. Using Serial GC.");
3149 }
3150 if (UseConcMarkSweepGC) {
3151 warning("Concurrent Mark Sweep GC is not supported in this VM. Using Serial GC.");
3152 }
3153 if (UseParNewGC) {
3154 warning("Par New GC is not supported in this VM. Using Serial GC.");
3155 }
3156 #endif // INCLUDE_ALTERNATE_GCS
3157
3158 #ifndef PRODUCT
3159 if (TraceBytecodesAt != 0) {
3160 TraceBytecodes = true;
3161 }
3162 if (CountCompiledCalls) {
3163 if (UseCounterDecay) {
3164 warning("UseCounterDecay disabled because CountCalls is set");
3165 UseCounterDecay = false;
3166 }
3167 }
3168 #endif // PRODUCT
3169
3170 // JSR 292 is not supported before 1.7
3171 if (!JDK_Version::is_gte_jdk17x_version()) {
3172 if (EnableInvokeDynamic) {
3173 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3174 warning("JSR 292 is not supported before 1.7. Disabling support.");
3175 }
3176 EnableInvokeDynamic = false;
3177 }
3178 }
3179
3180 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3181 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3182 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3183 }
3184 ScavengeRootsInCode = 1;
3185 }
3186
3187 if (PrintGCDetails) {
3188 // Turn on -verbose:gc options as well
3189 PrintGC = true;
3190 }
3191
3192 if (!JDK_Version::is_gte_jdk18x_version()) {
3193 // To avoid changing the log format for 7 updates this flag is only
3194 // true by default in JDK8 and above.
3195 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3196 FLAG_SET_DEFAULT(PrintGCCause, false);
3197 }
3198 }
3199
3200 // Set object alignment values.
3201 set_object_alignment();
3202
3203 #ifdef SERIALGC
3204 force_serial_gc();
3205 #endif // SERIALGC
3206 #if !INCLUDE_CDS
3207 no_shared_spaces();
3208 #endif // INCLUDE_CDS
3209
3210 // Set flags based on ergonomics.
3211 set_ergonomics_flags();
3212
3213 set_shared_spaces_flags();
3214
3215 // Check the GC selections again.
3216 if (!check_gc_consistency()) {
3217 return JNI_EINVAL;
3218 }
3219
3220 if (TieredCompilation) {
3221 set_tiered_flags();
3222 } else {
3223 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3224 if (CompilationPolicyChoice >= 2) {
3225 vm_exit_during_initialization(
3226 "Incompatible compilation policy selected", NULL);
3227 }
3228 }
3229
3230 // Set heap size based on available physical memory
3231 set_heap_size();
3232
3233 #if INCLUDE_ALTERNATE_GCS
3234 // Set per-collector flags
3235 if (UseParallelGC || UseParallelOldGC) {
3236 set_parallel_gc_flags();
3237 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3238 set_cms_and_parnew_gc_flags();
3239 } else if (UseParNewGC) { // skipped if CMS is set above
3240 set_parnew_gc_flags();
3241 } else if (UseG1GC) {
3242 set_g1_gc_flags();
3243 }
3244 #endif // INCLUDE_ALTERNATE_GCS
3245
3246 #ifdef SERIALGC
3247 assert(verify_serial_gc_flags(), "SerialGC unset");
3248 #endif // SERIALGC
3249
3250 // Set bytecode rewriting flags
3251 set_bytecode_flags();
3252
3253 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3254 set_aggressive_opts_flags();
3255
3256 // Turn off biased locking for locking debug mode flags,
3257 // which are subtlely different from each other but neither works with
3258 // biased locking.
3259 if (UseHeavyMonitors
3260 #ifdef COMPILER1
3261 || !UseFastLocking
3262 #endif // COMPILER1
3263 ) {
3264 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3265 // flag set to true on command line; warn the user that they
3266 // can't enable biased locking here
3267 warning("Biased Locking is not supported with locking debug flags"
3268 "; ignoring UseBiasedLocking flag." );
3269 }
3270 UseBiasedLocking = false;
3271 }
3272
3273 #ifdef CC_INTERP
3274 // Clear flags not supported by the C++ interpreter
3275 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3276 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3277 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3278 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
3279 #endif // CC_INTERP
3280
3281 #ifdef COMPILER2
3282 if (!UseBiasedLocking || EmitSync != 0) {
3283 UseOptoBiasInlining = false;
3284 }
3285 if (!EliminateLocks) {
3286 EliminateNestedLocks = false;
3287 }
3288 #endif
3289
3290 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3291 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3292 DebugNonSafepoints = true;
3293 }
3294
3295 #ifndef PRODUCT
3296 if (CompileTheWorld) {
3297 // Force NmethodSweeper to sweep whole CodeCache each time.
3298 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3299 NmethodSweepFraction = 1;
3300 }
3301 }
3302 #endif
3303
3304 if (PrintCommandLineFlags) {
3305 CommandLineFlags::printSetFlags(tty);
3306 }
3307
3308 // Apply CPU specific policy for the BiasedLocking
3309 if (UseBiasedLocking) {
3310 if (!VM_Version::use_biased_locking() &&
3311 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3312 UseBiasedLocking = false;
3313 }
3314 }
3315
3316 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3317 // but only if not already set on the commandline
3318 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3319 bool set = false;
3320 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3321 if (!set) {
3322 FLAG_SET_DEFAULT(PauseAtExit, true);
3323 }
3324 }
3325
3326 return JNI_OK;
3327 }
3328
3329 int Arguments::PropertyList_count(SystemProperty* pl) {
3330 int count = 0;
3331 while(pl != NULL) {
3332 count++;
3333 pl = pl->next();
3334 }
3335 return count;
3336 }
3337
3338 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3339 assert(key != NULL, "just checking");
3340 SystemProperty* prop;
3341 for (prop = pl; prop != NULL; prop = prop->next()) {
3342 if (strcmp(key, prop->key()) == 0) return prop->value();
3343 }
3344 return NULL;
3345 }
3346
3347 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3348 int count = 0;
3349 const char* ret_val = NULL;
3350
3351 while(pl != NULL) {
3352 if(count >= index) {
3353 ret_val = pl->key();
3354 break;
3355 }
3356 count++;
3357 pl = pl->next();
3358 }
3359
3360 return ret_val;
3361 }
3362
3363 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3364 int count = 0;
3365 char* ret_val = NULL;
3366
3367 while(pl != NULL) {
3368 if(count >= index) {
3369 ret_val = pl->value();
3370 break;
3371 }
3372 count++;
3373 pl = pl->next();
3374 }
3375
3376 return ret_val;
3377 }
3378
3379 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3380 SystemProperty* p = *plist;
3381 if (p == NULL) {
3382 *plist = new_p;
3383 } else {
3384 while (p->next() != NULL) {
3385 p = p->next();
3386 }
3387 p->set_next(new_p);
3388 }
3389 }
3390
3391 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3392 if (plist == NULL)
3393 return;
3394
3395 SystemProperty* new_p = new SystemProperty(k, v, true);
3396 PropertyList_add(plist, new_p);
3397 }
3398
3399 // This add maintains unique property key in the list.
3400 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3401 if (plist == NULL)
3402 return;
3403
3404 // If property key exist then update with new value.
3405 SystemProperty* prop;
3406 for (prop = *plist; prop != NULL; prop = prop->next()) {
3407 if (strcmp(k, prop->key()) == 0) {
3408 if (append) {
3409 prop->append_value(v);
3410 } else {
3411 prop->set_value(v);
3412 }
3413 return;
3414 }
3415 }
3416
3417 PropertyList_add(plist, k, v);
3418 }
3419
3420 #ifdef KERNEL
3421 char *Arguments::get_kernel_properties() {
3422 // Find properties starting with kernel and append them to string
3423 // We need to find out how long they are first because the URL's that they
3424 // might point to could get long.
3425 int length = 0;
3426 SystemProperty* prop;
3427 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3428 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3429 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3430 }
3431 }
3432 // Add one for null terminator.
3433 char *props = AllocateHeap(length + 1, mtInternal);
3434 if (length != 0) {
3435 int pos = 0;
3436 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3437 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3438 jio_snprintf(&props[pos], length-pos,
3439 "-D%s=%s ", prop->key(), prop->value());
3440 pos = strlen(props);
3441 }
3442 }
3443 }
3444 // null terminate props in case of null
3445 props[length] = '\0';
3446 return props;
3447 }
3448 #endif // KERNEL
3449
3450 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3451 // Returns true if all of the source pointed by src has been copied over to
3452 // the destination buffer pointed by buf. Otherwise, returns false.
3453 // Notes:
3454 // 1. If the length (buflen) of the destination buffer excluding the
3455 // NULL terminator character is not long enough for holding the expanded
3456 // pid characters, it also returns false instead of returning the partially
3457 // expanded one.
3458 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3459 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3460 char* buf, size_t buflen) {
3461 const char* p = src;
3462 char* b = buf;
3463 const char* src_end = &src[srclen];
3464 char* buf_end = &buf[buflen - 1];
3465
3466 while (p < src_end && b < buf_end) {
3467 if (*p == '%') {
3468 switch (*(++p)) {
3469 case '%': // "%%" ==> "%"
3470 *b++ = *p++;
3471 break;
3472 case 'p': { // "%p" ==> current process id
3473 // buf_end points to the character before the last character so
3474 // that we could write '\0' to the end of the buffer.
3475 size_t buf_sz = buf_end - b + 1;
3476 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3477
3478 // if jio_snprintf fails or the buffer is not long enough to hold
3479 // the expanded pid, returns false.
3480 if (ret < 0 || ret >= (int)buf_sz) {
3481 return false;
3482 } else {
3483 b += ret;
3484 assert(*b == '\0', "fail in copy_expand_pid");
3485 if (p == src_end && b == buf_end + 1) {
3486 // reach the end of the buffer.
3487 return true;
3488 }
3489 }
3490 p++;
3491 break;
3492 }
3493 default :
3494 *b++ = '%';
3495 }
3496 } else {
3497 *b++ = *p++;
3498 }
3499 }
3500 *b = '\0';
3501 return (p == src_end); // return false if not all of the source was copied
3502 }