1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "compiler/compilerOracle.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/cardTableRS.hpp"
31 #include "memory/referenceProcessor.hpp"
32 #include "memory/universe.inline.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "prims/jvmtiExport.hpp"
35 #include "runtime/arguments.hpp"
36 #include "runtime/globals_extension.hpp"
37 #include "runtime/java.hpp"
38 #include "services/management.hpp"
39 #include "services/memTracker.hpp"
40 #include "utilities/defaultStream.hpp"
41 #include "utilities/macros.hpp"
42 #include "utilities/taskqueue.hpp"
43 #ifdef TARGET_OS_FAMILY_linux
44 # include "os_linux.inline.hpp"
45 #endif
46 #ifdef TARGET_OS_FAMILY_solaris
47 # include "os_solaris.inline.hpp"
48 #endif
49 #ifdef TARGET_OS_FAMILY_windows
50 # include "os_windows.inline.hpp"
51 #endif
52 #ifdef TARGET_OS_FAMILY_bsd
53 # include "os_bsd.inline.hpp"
54 #endif
55 #if INCLUDE_ALL_GCS
56 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
57 #endif // INCLUDE_ALL_GCS
58
59 // Note: This is a special bug reporting site for the JVM
60 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
61 #define DEFAULT_JAVA_LAUNCHER "generic"
62
63 char** Arguments::_jvm_flags_array = NULL;
64 int Arguments::_num_jvm_flags = 0;
65 char** Arguments::_jvm_args_array = NULL;
66 int Arguments::_num_jvm_args = 0;
67 char* Arguments::_java_command = NULL;
68 SystemProperty* Arguments::_system_properties = NULL;
69 const char* Arguments::_gc_log_filename = NULL;
70 bool Arguments::_has_profile = false;
71 bool Arguments::_has_alloc_profile = false;
72 uintx Arguments::_min_heap_size = 0;
73 Arguments::Mode Arguments::_mode = _mixed;
74 bool Arguments::_java_compiler = false;
75 bool Arguments::_xdebug_mode = false;
76 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
77 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
78 int Arguments::_sun_java_launcher_pid = -1;
79 bool Arguments::_created_by_gamma_launcher = false;
80
81 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
82 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
83 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
84 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
85 bool Arguments::_ClipInlining = ClipInlining;
86
87 char* Arguments::SharedArchivePath = NULL;
88
89 AgentLibraryList Arguments::_libraryList;
90 AgentLibraryList Arguments::_agentList;
91
92 abort_hook_t Arguments::_abort_hook = NULL;
93 exit_hook_t Arguments::_exit_hook = NULL;
94 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
95
96
97 SystemProperty *Arguments::_java_ext_dirs = NULL;
98 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
99 SystemProperty *Arguments::_sun_boot_library_path = NULL;
100 SystemProperty *Arguments::_java_library_path = NULL;
101 SystemProperty *Arguments::_java_home = NULL;
102 SystemProperty *Arguments::_java_class_path = NULL;
103 SystemProperty *Arguments::_sun_boot_class_path = NULL;
104
105 char* Arguments::_meta_index_path = NULL;
106 char* Arguments::_meta_index_dir = NULL;
107
108 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
109
110 static bool match_option(const JavaVMOption *option, const char* name,
111 const char** tail) {
112 int len = (int)strlen(name);
113 if (strncmp(option->optionString, name, len) == 0) {
114 *tail = option->optionString + len;
115 return true;
116 } else {
117 return false;
118 }
119 }
120
121 static void logOption(const char* opt) {
122 if (PrintVMOptions) {
123 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
124 }
125 }
126
127 // Process java launcher properties.
128 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
129 // See if sun.java.launcher or sun.java.launcher.pid is defined.
130 // Must do this before setting up other system properties,
131 // as some of them may depend on launcher type.
132 for (int index = 0; index < args->nOptions; index++) {
133 const JavaVMOption* option = args->options + index;
134 const char* tail;
135
136 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
137 process_java_launcher_argument(tail, option->extraInfo);
138 continue;
139 }
140 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
141 _sun_java_launcher_pid = atoi(tail);
142 continue;
143 }
144 }
145 }
146
147 // Initialize system properties key and value.
148 void Arguments::init_system_properties() {
149
150 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
151 "Java Virtual Machine Specification", false));
152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
154 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
155
156 // following are JVMTI agent writeable properties.
157 // Properties values are set to NULL and they are
158 // os specific they are initialized in os::init_system_properties_values().
159 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
160 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
161 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
162 _java_library_path = new SystemProperty("java.library.path", NULL, true);
163 _java_home = new SystemProperty("java.home", NULL, true);
164 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
165
166 _java_class_path = new SystemProperty("java.class.path", "", true);
167
168 // Add to System Property list.
169 PropertyList_add(&_system_properties, _java_ext_dirs);
170 PropertyList_add(&_system_properties, _java_endorsed_dirs);
171 PropertyList_add(&_system_properties, _sun_boot_library_path);
172 PropertyList_add(&_system_properties, _java_library_path);
173 PropertyList_add(&_system_properties, _java_home);
174 PropertyList_add(&_system_properties, _java_class_path);
175 PropertyList_add(&_system_properties, _sun_boot_class_path);
176
177 // Set OS specific system properties values
178 os::init_system_properties_values();
179 }
180
181
182 // Update/Initialize System properties after JDK version number is known
183 void Arguments::init_version_specific_system_properties() {
184 enum { bufsz = 16 };
185 char buffer[bufsz];
186 const char* spec_vendor = "Sun Microsystems Inc.";
187 uint32_t spec_version = 0;
188
189 if (JDK_Version::is_gte_jdk17x_version()) {
190 spec_vendor = "Oracle Corporation";
191 spec_version = JDK_Version::current().major_version();
192 }
193 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
194
195 PropertyList_add(&_system_properties,
196 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
197 PropertyList_add(&_system_properties,
198 new SystemProperty("java.vm.specification.version", buffer, false));
199 PropertyList_add(&_system_properties,
200 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
201 }
202
203 /**
204 * Provide a slightly more user-friendly way of eliminating -XX flags.
205 * When a flag is eliminated, it can be added to this list in order to
206 * continue accepting this flag on the command-line, while issuing a warning
207 * and ignoring the value. Once the JDK version reaches the 'accept_until'
208 * limit, we flatly refuse to admit the existence of the flag. This allows
209 * a flag to die correctly over JDK releases using HSX.
210 */
211 typedef struct {
212 const char* name;
213 JDK_Version obsoleted_in; // when the flag went away
214 JDK_Version accept_until; // which version to start denying the existence
215 } ObsoleteFlag;
216
217 static ObsoleteFlag obsolete_jvm_flags[] = {
218 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
230 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
231 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
232 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
233 { "DefaultInitialRAMFraction",
234 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
235 { "UseDepthFirstScavengeOrder",
236 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
237 { "HandlePromotionFailure",
238 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
239 { "MaxLiveObjectEvacuationRatio",
240 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
241 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
242 { "UseParallelOldGCCompacting",
243 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
244 { "UseParallelDensePrefixUpdate",
245 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
246 { "UseParallelOldGCDensePrefix",
247 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
248 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
249 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
250 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
251 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
252 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
253 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
254 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
255 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
256 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
257 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
258 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
259 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
260 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
261 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
262 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
263 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
264 #ifdef PRODUCT
265 { "DesiredMethodLimit",
266 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
267 #endif // PRODUCT
268 { NULL, JDK_Version(0), JDK_Version(0) }
269 };
270
271 // Returns true if the flag is obsolete and fits into the range specified
272 // for being ignored. In the case that the flag is ignored, the 'version'
273 // value is filled in with the version number when the flag became
274 // obsolete so that that value can be displayed to the user.
275 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
276 int i = 0;
277 assert(version != NULL, "Must provide a version buffer");
278 while (obsolete_jvm_flags[i].name != NULL) {
279 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
280 // <flag>=xxx form
281 // [-|+]<flag> form
282 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
283 ((s[0] == '+' || s[0] == '-') &&
284 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
285 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
286 *version = flag_status.obsoleted_in;
287 return true;
288 }
289 }
290 i++;
291 }
292 return false;
293 }
294
295 // Constructs the system class path (aka boot class path) from the following
296 // components, in order:
297 //
298 // prefix // from -Xbootclasspath/p:...
299 // endorsed // the expansion of -Djava.endorsed.dirs=...
300 // base // from os::get_system_properties() or -Xbootclasspath=
301 // suffix // from -Xbootclasspath/a:...
302 //
303 // java.endorsed.dirs is a list of directories; any jar or zip files in the
304 // directories are added to the sysclasspath just before the base.
305 //
306 // This could be AllStatic, but it isn't needed after argument processing is
307 // complete.
308 class SysClassPath: public StackObj {
309 public:
310 SysClassPath(const char* base);
311 ~SysClassPath();
312
313 inline void set_base(const char* base);
314 inline void add_prefix(const char* prefix);
315 inline void add_suffix_to_prefix(const char* suffix);
316 inline void add_suffix(const char* suffix);
317 inline void reset_path(const char* base);
318
319 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
320 // property. Must be called after all command-line arguments have been
321 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
322 // combined_path().
323 void expand_endorsed();
324
325 inline const char* get_base() const { return _items[_scp_base]; }
326 inline const char* get_prefix() const { return _items[_scp_prefix]; }
327 inline const char* get_suffix() const { return _items[_scp_suffix]; }
328 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
329
330 // Combine all the components into a single c-heap-allocated string; caller
331 // must free the string if/when no longer needed.
332 char* combined_path();
333
334 private:
335 // Utility routines.
336 static char* add_to_path(const char* path, const char* str, bool prepend);
337 static char* add_jars_to_path(char* path, const char* directory);
338
339 inline void reset_item_at(int index);
340
341 // Array indices for the items that make up the sysclasspath. All except the
342 // base are allocated in the C heap and freed by this class.
343 enum {
344 _scp_prefix, // from -Xbootclasspath/p:...
345 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
346 _scp_base, // the default sysclasspath
347 _scp_suffix, // from -Xbootclasspath/a:...
348 _scp_nitems // the number of items, must be last.
349 };
350
351 const char* _items[_scp_nitems];
352 DEBUG_ONLY(bool _expansion_done;)
353 };
354
355 SysClassPath::SysClassPath(const char* base) {
356 memset(_items, 0, sizeof(_items));
357 _items[_scp_base] = base;
358 DEBUG_ONLY(_expansion_done = false;)
359 }
360
361 SysClassPath::~SysClassPath() {
362 // Free everything except the base.
363 for (int i = 0; i < _scp_nitems; ++i) {
364 if (i != _scp_base) reset_item_at(i);
365 }
366 DEBUG_ONLY(_expansion_done = false;)
367 }
368
369 inline void SysClassPath::set_base(const char* base) {
370 _items[_scp_base] = base;
371 }
372
373 inline void SysClassPath::add_prefix(const char* prefix) {
374 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
375 }
376
377 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
378 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
379 }
380
381 inline void SysClassPath::add_suffix(const char* suffix) {
382 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
383 }
384
385 inline void SysClassPath::reset_item_at(int index) {
386 assert(index < _scp_nitems && index != _scp_base, "just checking");
387 if (_items[index] != NULL) {
388 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
389 _items[index] = NULL;
390 }
391 }
392
393 inline void SysClassPath::reset_path(const char* base) {
394 // Clear the prefix and suffix.
395 reset_item_at(_scp_prefix);
396 reset_item_at(_scp_suffix);
397 set_base(base);
398 }
399
400 //------------------------------------------------------------------------------
401
402 void SysClassPath::expand_endorsed() {
403 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
404
405 const char* path = Arguments::get_property("java.endorsed.dirs");
406 if (path == NULL) {
407 path = Arguments::get_endorsed_dir();
408 assert(path != NULL, "no default for java.endorsed.dirs");
409 }
410
411 char* expanded_path = NULL;
412 const char separator = *os::path_separator();
413 const char* const end = path + strlen(path);
414 while (path < end) {
415 const char* tmp_end = strchr(path, separator);
416 if (tmp_end == NULL) {
417 expanded_path = add_jars_to_path(expanded_path, path);
418 path = end;
419 } else {
420 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
421 memcpy(dirpath, path, tmp_end - path);
422 dirpath[tmp_end - path] = '\0';
423 expanded_path = add_jars_to_path(expanded_path, dirpath);
424 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
425 path = tmp_end + 1;
426 }
427 }
428 _items[_scp_endorsed] = expanded_path;
429 DEBUG_ONLY(_expansion_done = true;)
430 }
431
432 // Combine the bootclasspath elements, some of which may be null, into a single
433 // c-heap-allocated string.
434 char* SysClassPath::combined_path() {
435 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
436 assert(_expansion_done, "must call expand_endorsed() first.");
437
438 size_t lengths[_scp_nitems];
439 size_t total_len = 0;
440
441 const char separator = *os::path_separator();
442
443 // Get the lengths.
444 int i;
445 for (i = 0; i < _scp_nitems; ++i) {
446 if (_items[i] != NULL) {
447 lengths[i] = strlen(_items[i]);
448 // Include space for the separator char (or a NULL for the last item).
449 total_len += lengths[i] + 1;
450 }
451 }
452 assert(total_len > 0, "empty sysclasspath not allowed");
453
454 // Copy the _items to a single string.
455 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
456 char* cp_tmp = cp;
457 for (i = 0; i < _scp_nitems; ++i) {
458 if (_items[i] != NULL) {
459 memcpy(cp_tmp, _items[i], lengths[i]);
460 cp_tmp += lengths[i];
461 *cp_tmp++ = separator;
462 }
463 }
464 *--cp_tmp = '\0'; // Replace the extra separator.
465 return cp;
466 }
467
468 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
469 char*
470 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
471 char *cp;
472
473 assert(str != NULL, "just checking");
474 if (path == NULL) {
475 size_t len = strlen(str) + 1;
476 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
477 memcpy(cp, str, len); // copy the trailing null
478 } else {
479 const char separator = *os::path_separator();
480 size_t old_len = strlen(path);
481 size_t str_len = strlen(str);
482 size_t len = old_len + str_len + 2;
483
484 if (prepend) {
485 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
486 char* cp_tmp = cp;
487 memcpy(cp_tmp, str, str_len);
488 cp_tmp += str_len;
489 *cp_tmp = separator;
490 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
491 FREE_C_HEAP_ARRAY(char, path, mtInternal);
492 } else {
493 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
494 char* cp_tmp = cp + old_len;
495 *cp_tmp = separator;
496 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
497 }
498 }
499 return cp;
500 }
501
502 // Scan the directory and append any jar or zip files found to path.
503 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
504 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
505 DIR* dir = os::opendir(directory);
506 if (dir == NULL) return path;
507
508 char dir_sep[2] = { '\0', '\0' };
509 size_t directory_len = strlen(directory);
510 const char fileSep = *os::file_separator();
511 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
512
513 /* Scan the directory for jars/zips, appending them to path. */
514 struct dirent *entry;
515 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
516 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
517 const char* name = entry->d_name;
518 const char* ext = name + strlen(name) - 4;
519 bool isJarOrZip = ext > name &&
520 (os::file_name_strcmp(ext, ".jar") == 0 ||
521 os::file_name_strcmp(ext, ".zip") == 0);
522 if (isJarOrZip) {
523 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
524 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
525 path = add_to_path(path, jarpath, false);
526 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
527 }
528 }
529 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
530 os::closedir(dir);
531 return path;
532 }
533
534 // Parses a memory size specification string.
535 static bool atomull(const char *s, julong* result) {
536 julong n = 0;
537 int args_read = sscanf(s, JULONG_FORMAT, &n);
538 if (args_read != 1) {
539 return false;
540 }
541 while (*s != '\0' && isdigit(*s)) {
542 s++;
543 }
544 // 4705540: illegal if more characters are found after the first non-digit
545 if (strlen(s) > 1) {
546 return false;
547 }
548 switch (*s) {
549 case 'T': case 't':
550 *result = n * G * K;
551 // Check for overflow.
552 if (*result/((julong)G * K) != n) return false;
553 return true;
554 case 'G': case 'g':
555 *result = n * G;
556 if (*result/G != n) return false;
557 return true;
558 case 'M': case 'm':
559 *result = n * M;
560 if (*result/M != n) return false;
561 return true;
562 case 'K': case 'k':
563 *result = n * K;
564 if (*result/K != n) return false;
565 return true;
566 case '\0':
567 *result = n;
568 return true;
569 default:
570 return false;
571 }
572 }
573
574 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
575 if (size < min_size) return arg_too_small;
576 // Check that size will fit in a size_t (only relevant on 32-bit)
577 if (size > max_uintx) return arg_too_big;
578 return arg_in_range;
579 }
580
581 // Describe an argument out of range error
582 void Arguments::describe_range_error(ArgsRange errcode) {
583 switch(errcode) {
584 case arg_too_big:
585 jio_fprintf(defaultStream::error_stream(),
586 "The specified size exceeds the maximum "
587 "representable size.\n");
588 break;
589 case arg_too_small:
590 case arg_unreadable:
591 case arg_in_range:
592 // do nothing for now
593 break;
594 default:
595 ShouldNotReachHere();
596 }
597 }
598
599 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
600 return CommandLineFlags::boolAtPut(name, &value, origin);
601 }
602
603 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
604 double v;
605 if (sscanf(value, "%lf", &v) != 1) {
606 return false;
607 }
608
609 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
610 return true;
611 }
612 return false;
613 }
614
615 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
616 julong v;
617 intx intx_v;
618 bool is_neg = false;
619 // Check the sign first since atomull() parses only unsigned values.
620 if (*value == '-') {
621 if (!CommandLineFlags::intxAt(name, &intx_v)) {
622 return false;
623 }
624 value++;
625 is_neg = true;
626 }
627 if (!atomull(value, &v)) {
628 return false;
629 }
630 intx_v = (intx) v;
631 if (is_neg) {
632 intx_v = -intx_v;
633 }
634 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
635 return true;
636 }
637 uintx uintx_v = (uintx) v;
638 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
639 return true;
640 }
641 uint64_t uint64_t_v = (uint64_t) v;
642 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
643 return true;
644 }
645 return false;
646 }
647
648 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
649 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
650 // Contract: CommandLineFlags always returns a pointer that needs freeing.
651 FREE_C_HEAP_ARRAY(char, value, mtInternal);
652 return true;
653 }
654
655 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
656 const char* old_value = "";
657 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
658 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
659 size_t new_len = strlen(new_value);
660 const char* value;
661 char* free_this_too = NULL;
662 if (old_len == 0) {
663 value = new_value;
664 } else if (new_len == 0) {
665 value = old_value;
666 } else {
667 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
668 // each new setting adds another LINE to the switch:
669 sprintf(buf, "%s\n%s", old_value, new_value);
670 value = buf;
671 free_this_too = buf;
672 }
673 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
674 // CommandLineFlags always returns a pointer that needs freeing.
675 FREE_C_HEAP_ARRAY(char, value, mtInternal);
676 if (free_this_too != NULL) {
677 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
678 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
679 }
680 return true;
681 }
682
683 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
684
685 // range of acceptable characters spelled out for portability reasons
686 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
687 #define BUFLEN 255
688 char name[BUFLEN+1];
689 char dummy;
690
691 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
692 return set_bool_flag(name, false, origin);
693 }
694 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
695 return set_bool_flag(name, true, origin);
696 }
697
698 char punct;
699 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
700 const char* value = strchr(arg, '=') + 1;
701 Flag* flag = Flag::find_flag(name, strlen(name));
702 if (flag != NULL && flag->is_ccstr()) {
703 if (flag->ccstr_accumulates()) {
704 return append_to_string_flag(name, value, origin);
705 } else {
706 if (value[0] == '\0') {
707 value = NULL;
708 }
709 return set_string_flag(name, value, origin);
710 }
711 }
712 }
713
714 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
715 const char* value = strchr(arg, '=') + 1;
716 // -XX:Foo:=xxx will reset the string flag to the given value.
717 if (value[0] == '\0') {
718 value = NULL;
719 }
720 return set_string_flag(name, value, origin);
721 }
722
723 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
724 #define SIGNED_NUMBER_RANGE "[-0123456789]"
725 #define NUMBER_RANGE "[0123456789]"
726 char value[BUFLEN + 1];
727 char value2[BUFLEN + 1];
728 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
729 // Looks like a floating-point number -- try again with more lenient format string
730 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
731 return set_fp_numeric_flag(name, value, origin);
732 }
733 }
734
735 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
736 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
737 return set_numeric_flag(name, value, origin);
738 }
739
740 return false;
741 }
742
743 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
744 assert(bldarray != NULL, "illegal argument");
745
746 if (arg == NULL) {
747 return;
748 }
749
750 int index = *count;
751
752 // expand the array and add arg to the last element
753 (*count)++;
754 if (*bldarray == NULL) {
755 *bldarray = NEW_C_HEAP_ARRAY(char*, *count, mtInternal);
756 } else {
757 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count, mtInternal);
758 }
759 (*bldarray)[index] = strdup(arg);
760 }
761
762 void Arguments::build_jvm_args(const char* arg) {
763 add_string(&_jvm_args_array, &_num_jvm_args, arg);
764 }
765
766 void Arguments::build_jvm_flags(const char* arg) {
767 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
768 }
769
770 // utility function to return a string that concatenates all
771 // strings in a given char** array
772 const char* Arguments::build_resource_string(char** args, int count) {
773 if (args == NULL || count == 0) {
774 return NULL;
775 }
776 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
777 for (int i = 1; i < count; i++) {
778 length += strlen(args[i]) + 1; // add 1 for a space
779 }
780 char* s = NEW_RESOURCE_ARRAY(char, length);
781 strcpy(s, args[0]);
782 for (int j = 1; j < count; j++) {
783 strcat(s, " ");
784 strcat(s, args[j]);
785 }
786 return (const char*) s;
787 }
788
789 void Arguments::print_on(outputStream* st) {
790 st->print_cr("VM Arguments:");
791 if (num_jvm_flags() > 0) {
792 st->print("jvm_flags: "); print_jvm_flags_on(st);
793 }
794 if (num_jvm_args() > 0) {
795 st->print("jvm_args: "); print_jvm_args_on(st);
796 }
797 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
798 if (_java_class_path != NULL) {
799 char* path = _java_class_path->value();
800 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
801 }
802 st->print_cr("Launcher Type: %s", _sun_java_launcher);
803 }
804
805 void Arguments::print_jvm_flags_on(outputStream* st) {
806 if (_num_jvm_flags > 0) {
807 for (int i=0; i < _num_jvm_flags; i++) {
808 st->print("%s ", _jvm_flags_array[i]);
809 }
810 st->print_cr("");
811 }
812 }
813
814 void Arguments::print_jvm_args_on(outputStream* st) {
815 if (_num_jvm_args > 0) {
816 for (int i=0; i < _num_jvm_args; i++) {
817 st->print("%s ", _jvm_args_array[i]);
818 }
819 st->print_cr("");
820 }
821 }
822
823 bool Arguments::process_argument(const char* arg,
824 jboolean ignore_unrecognized, FlagValueOrigin origin) {
825
826 JDK_Version since = JDK_Version();
827
828 if (parse_argument(arg, origin) || ignore_unrecognized) {
829 return true;
830 }
831
832 bool has_plus_minus = (*arg == '+' || *arg == '-');
833 const char* const argname = has_plus_minus ? arg + 1 : arg;
834 if (is_newly_obsolete(arg, &since)) {
835 char version[256];
836 since.to_string(version, sizeof(version));
837 warning("ignoring option %s; support was removed in %s", argname, version);
838 return true;
839 }
840
841 // For locked flags, report a custom error message if available.
842 // Otherwise, report the standard unrecognized VM option.
843
844 size_t arg_len;
845 const char* equal_sign = strchr(argname, '=');
846 if (equal_sign == NULL) {
847 arg_len = strlen(argname);
848 } else {
849 arg_len = equal_sign - argname;
850 }
851
852 Flag* found_flag = Flag::find_flag((char*)argname, arg_len, true);
853 if (found_flag != NULL) {
854 char locked_message_buf[BUFLEN];
855 found_flag->get_locked_message(locked_message_buf, BUFLEN);
856 if (strlen(locked_message_buf) == 0) {
857 if (found_flag->is_bool() && !has_plus_minus) {
858 jio_fprintf(defaultStream::error_stream(),
859 "Missing +/- setting for VM option '%s'\n", argname);
860 } else if (!found_flag->is_bool() && has_plus_minus) {
861 jio_fprintf(defaultStream::error_stream(),
862 "Unexpected +/- setting in VM option '%s'\n", argname);
863 } else {
864 jio_fprintf(defaultStream::error_stream(),
865 "Improperly specified VM option '%s'\n", argname);
866 }
867 } else {
868 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
869 }
870 } else {
871 jio_fprintf(defaultStream::error_stream(),
872 "Unrecognized VM option '%s'\n", argname);
873 }
874
875 // allow for commandline "commenting out" options like -XX:#+Verbose
876 return arg[0] == '#';
877 }
878
879 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
880 FILE* stream = fopen(file_name, "rb");
881 if (stream == NULL) {
882 if (should_exist) {
883 jio_fprintf(defaultStream::error_stream(),
884 "Could not open settings file %s\n", file_name);
885 return false;
886 } else {
887 return true;
888 }
889 }
890
891 char token[1024];
892 int pos = 0;
893
894 bool in_white_space = true;
895 bool in_comment = false;
896 bool in_quote = false;
897 char quote_c = 0;
898 bool result = true;
899
900 int c = getc(stream);
901 while(c != EOF && pos < (int)(sizeof(token)-1)) {
902 if (in_white_space) {
903 if (in_comment) {
904 if (c == '\n') in_comment = false;
905 } else {
906 if (c == '#') in_comment = true;
907 else if (!isspace(c)) {
908 in_white_space = false;
909 token[pos++] = c;
910 }
911 }
912 } else {
913 if (c == '\n' || (!in_quote && isspace(c))) {
914 // token ends at newline, or at unquoted whitespace
915 // this allows a way to include spaces in string-valued options
916 token[pos] = '\0';
917 logOption(token);
918 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
919 build_jvm_flags(token);
920 pos = 0;
921 in_white_space = true;
922 in_quote = false;
923 } else if (!in_quote && (c == '\'' || c == '"')) {
924 in_quote = true;
925 quote_c = c;
926 } else if (in_quote && (c == quote_c)) {
927 in_quote = false;
928 } else {
929 token[pos++] = c;
930 }
931 }
932 c = getc(stream);
933 }
934 if (pos > 0) {
935 token[pos] = '\0';
936 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
937 build_jvm_flags(token);
938 }
939 fclose(stream);
940 return result;
941 }
942
943 //=============================================================================================================
944 // Parsing of properties (-D)
945
946 const char* Arguments::get_property(const char* key) {
947 return PropertyList_get_value(system_properties(), key);
948 }
949
950 bool Arguments::add_property(const char* prop) {
951 const char* eq = strchr(prop, '=');
952 char* key;
953 // ns must be static--its address may be stored in a SystemProperty object.
954 const static char ns[1] = {0};
955 char* value = (char *)ns;
956
957 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
958 key = AllocateHeap(key_len + 1, mtInternal);
959 strncpy(key, prop, key_len);
960 key[key_len] = '\0';
961
962 if (eq != NULL) {
963 size_t value_len = strlen(prop) - key_len - 1;
964 value = AllocateHeap(value_len + 1, mtInternal);
965 strncpy(value, &prop[key_len + 1], value_len + 1);
966 }
967
968 if (strcmp(key, "java.compiler") == 0) {
969 process_java_compiler_argument(value);
970 FreeHeap(key);
971 if (eq != NULL) {
972 FreeHeap(value);
973 }
974 return true;
975 } else if (strcmp(key, "sun.java.command") == 0) {
976 _java_command = value;
977
978 // Record value in Arguments, but let it get passed to Java.
979 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
980 // launcher.pid property is private and is processed
981 // in process_sun_java_launcher_properties();
982 // the sun.java.launcher property is passed on to the java application
983 FreeHeap(key);
984 if (eq != NULL) {
985 FreeHeap(value);
986 }
987 return true;
988 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
989 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
990 // its value without going through the property list or making a Java call.
991 _java_vendor_url_bug = value;
992 } else if (strcmp(key, "sun.boot.library.path") == 0) {
993 PropertyList_unique_add(&_system_properties, key, value, true);
994 return true;
995 }
996 // Create new property and add at the end of the list
997 PropertyList_unique_add(&_system_properties, key, value);
998 return true;
999 }
1000
1001 //===========================================================================================================
1002 // Setting int/mixed/comp mode flags
1003
1004 void Arguments::set_mode_flags(Mode mode) {
1005 // Set up default values for all flags.
1006 // If you add a flag to any of the branches below,
1007 // add a default value for it here.
1008 set_java_compiler(false);
1009 _mode = mode;
1010
1011 // Ensure Agent_OnLoad has the correct initial values.
1012 // This may not be the final mode; mode may change later in onload phase.
1013 PropertyList_unique_add(&_system_properties, "java.vm.info",
1014 (char*)VM_Version::vm_info_string(), false);
1015
1016 UseInterpreter = true;
1017 UseCompiler = true;
1018 UseLoopCounter = true;
1019
1020 #ifndef ZERO
1021 // Turn these off for mixed and comp. Leave them on for Zero.
1022 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1023 UseFastAccessorMethods = (mode == _int);
1024 }
1025 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1026 UseFastEmptyMethods = (mode == _int);
1027 }
1028 #endif
1029
1030 // Default values may be platform/compiler dependent -
1031 // use the saved values
1032 ClipInlining = Arguments::_ClipInlining;
1033 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1034 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1035 BackgroundCompilation = Arguments::_BackgroundCompilation;
1036
1037 // Change from defaults based on mode
1038 switch (mode) {
1039 default:
1040 ShouldNotReachHere();
1041 break;
1042 case _int:
1043 UseCompiler = false;
1044 UseLoopCounter = false;
1045 AlwaysCompileLoopMethods = false;
1046 UseOnStackReplacement = false;
1047 break;
1048 case _mixed:
1049 // same as default
1050 break;
1051 case _comp:
1052 UseInterpreter = false;
1053 BackgroundCompilation = false;
1054 ClipInlining = false;
1055 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1056 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1057 // compile a level 4 (C2) and then continue executing it.
1058 if (TieredCompilation) {
1059 Tier3InvokeNotifyFreqLog = 0;
1060 Tier4InvocationThreshold = 0;
1061 }
1062 break;
1063 }
1064 }
1065
1066 // Conflict: required to use shared spaces (-Xshare:on), but
1067 // incompatible command line options were chosen.
1068
1069 static void no_shared_spaces() {
1070 if (RequireSharedSpaces) {
1071 jio_fprintf(defaultStream::error_stream(),
1072 "Class data sharing is inconsistent with other specified options.\n");
1073 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1074 } else {
1075 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1076 }
1077 }
1078
1079 void Arguments::set_tiered_flags() {
1080 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1081 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1082 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1083 }
1084 if (CompilationPolicyChoice < 2) {
1085 vm_exit_during_initialization(
1086 "Incompatible compilation policy selected", NULL);
1087 }
1088 // Increase the code cache size - tiered compiles a lot more.
1089 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1090 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1091 }
1092 }
1093
1094 #if INCLUDE_ALL_GCS
1095 static void disable_adaptive_size_policy(const char* collector_name) {
1096 if (UseAdaptiveSizePolicy) {
1097 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1098 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1099 collector_name);
1100 }
1101 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1102 }
1103 }
1104
1105 void Arguments::set_parnew_gc_flags() {
1106 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1107 "control point invariant");
1108 assert(UseParNewGC, "Error");
1109
1110 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1111 disable_adaptive_size_policy("UseParNewGC");
1112
1113 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1114 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1115 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1116 } else if (ParallelGCThreads == 0) {
1117 jio_fprintf(defaultStream::error_stream(),
1118 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1119 vm_exit(1);
1120 }
1121
1122 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1123 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1124 // we set them to 1024 and 1024.
1125 // See CR 6362902.
1126 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1127 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1128 }
1129 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1130 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1131 }
1132
1133 // AlwaysTenure flag should make ParNew promote all at first collection.
1134 // See CR 6362902.
1135 if (AlwaysTenure) {
1136 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1137 }
1138 // When using compressed oops, we use local overflow stacks,
1139 // rather than using a global overflow list chained through
1140 // the klass word of the object's pre-image.
1141 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1142 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1143 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1144 }
1145 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1146 }
1147 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1148 }
1149
1150 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1151 // sparc/solaris for certain applications, but would gain from
1152 // further optimization and tuning efforts, and would almost
1153 // certainly gain from analysis of platform and environment.
1154 void Arguments::set_cms_and_parnew_gc_flags() {
1155 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1156 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1157
1158 // If we are using CMS, we prefer to UseParNewGC,
1159 // unless explicitly forbidden.
1160 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1161 FLAG_SET_ERGO(bool, UseParNewGC, true);
1162 }
1163
1164 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1165 disable_adaptive_size_policy("UseConcMarkSweepGC");
1166
1167 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1168 // as needed.
1169 if (UseParNewGC) {
1170 set_parnew_gc_flags();
1171 }
1172
1173 size_t max_heap = align_size_down(MaxHeapSize,
1174 CardTableRS::ct_max_alignment_constraint());
1175
1176 // Now make adjustments for CMS
1177 intx tenuring_default = (intx)6;
1178 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1179
1180 // Preferred young gen size for "short" pauses:
1181 // upper bound depends on # of threads and NewRatio.
1182 const uintx parallel_gc_threads =
1183 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1184 const size_t preferred_max_new_size_unaligned =
1185 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1186 size_t preferred_max_new_size =
1187 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1188
1189 // Unless explicitly requested otherwise, size young gen
1190 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1191
1192 // If either MaxNewSize or NewRatio is set on the command line,
1193 // assume the user is trying to set the size of the young gen.
1194 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1195
1196 // Set MaxNewSize to our calculated preferred_max_new_size unless
1197 // NewSize was set on the command line and it is larger than
1198 // preferred_max_new_size.
1199 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1200 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1201 } else {
1202 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1203 }
1204 if (PrintGCDetails && Verbose) {
1205 // Too early to use gclog_or_tty
1206 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1207 }
1208
1209 // Code along this path potentially sets NewSize and OldSize
1210 if (PrintGCDetails && Verbose) {
1211 // Too early to use gclog_or_tty
1212 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1213 " initial_heap_size: " SIZE_FORMAT
1214 " max_heap: " SIZE_FORMAT,
1215 min_heap_size(), InitialHeapSize, max_heap);
1216 }
1217 size_t min_new = preferred_max_new_size;
1218 if (FLAG_IS_CMDLINE(NewSize)) {
1219 min_new = NewSize;
1220 }
1221 if (max_heap > min_new && min_heap_size() > min_new) {
1222 // Unless explicitly requested otherwise, make young gen
1223 // at least min_new, and at most preferred_max_new_size.
1224 if (FLAG_IS_DEFAULT(NewSize)) {
1225 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1226 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1227 if (PrintGCDetails && Verbose) {
1228 // Too early to use gclog_or_tty
1229 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1230 }
1231 }
1232 // Unless explicitly requested otherwise, size old gen
1233 // so it's NewRatio x of NewSize.
1234 if (FLAG_IS_DEFAULT(OldSize)) {
1235 if (max_heap > NewSize) {
1236 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1237 if (PrintGCDetails && Verbose) {
1238 // Too early to use gclog_or_tty
1239 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1240 }
1241 }
1242 }
1243 }
1244 }
1245 // Unless explicitly requested otherwise, definitely
1246 // promote all objects surviving "tenuring_default" scavenges.
1247 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1248 FLAG_IS_DEFAULT(SurvivorRatio)) {
1249 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1250 }
1251 // If we decided above (or user explicitly requested)
1252 // `promote all' (via MaxTenuringThreshold := 0),
1253 // prefer minuscule survivor spaces so as not to waste
1254 // space for (non-existent) survivors
1255 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1256 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1257 }
1258 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1259 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1260 // This is done in order to make ParNew+CMS configuration to work
1261 // with YoungPLABSize and OldPLABSize options.
1262 // See CR 6362902.
1263 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1264 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1265 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1266 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1267 // the value (either from the command line or ergonomics) of
1268 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1269 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1270 } else {
1271 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1272 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1273 // we'll let it to take precedence.
1274 jio_fprintf(defaultStream::error_stream(),
1275 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1276 " options are specified for the CMS collector."
1277 " CMSParPromoteBlocksToClaim will take precedence.\n");
1278 }
1279 }
1280 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1281 // OldPLAB sizing manually turned off: Use a larger default setting,
1282 // unless it was manually specified. This is because a too-low value
1283 // will slow down scavenges.
1284 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1285 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1286 }
1287 }
1288 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1289 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1290 // If either of the static initialization defaults have changed, note this
1291 // modification.
1292 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1293 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1294 }
1295 if (PrintGCDetails && Verbose) {
1296 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1297 MarkStackSize / K, MarkStackSizeMax / K);
1298 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1299 }
1300 }
1301 #endif // INCLUDE_ALL_GCS
1302
1303 void set_object_alignment() {
1304 // Object alignment.
1305 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1306 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1307 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1308 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1309 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1310 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1311
1312 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1313 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1314
1315 // Oop encoding heap max
1316 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1317
1318 #if INCLUDE_ALL_GCS
1319 // Set CMS global values
1320 CompactibleFreeListSpace::set_cms_values();
1321 #endif // INCLUDE_ALL_GCS
1322 }
1323
1324 bool verify_object_alignment() {
1325 // Object alignment.
1326 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1327 jio_fprintf(defaultStream::error_stream(),
1328 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1329 (int)ObjectAlignmentInBytes);
1330 return false;
1331 }
1332 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1333 jio_fprintf(defaultStream::error_stream(),
1334 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1335 (int)ObjectAlignmentInBytes, BytesPerLong);
1336 return false;
1337 }
1338 // It does not make sense to have big object alignment
1339 // since a space lost due to alignment will be greater
1340 // then a saved space from compressed oops.
1341 if ((int)ObjectAlignmentInBytes > 256) {
1342 jio_fprintf(defaultStream::error_stream(),
1343 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1344 (int)ObjectAlignmentInBytes);
1345 return false;
1346 }
1347 // In case page size is very small.
1348 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1349 jio_fprintf(defaultStream::error_stream(),
1350 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1351 (int)ObjectAlignmentInBytes, os::vm_page_size());
1352 return false;
1353 }
1354 return true;
1355 }
1356
1357 inline uintx max_heap_for_compressed_oops() {
1358 // Avoid sign flip.
1359 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) {
1360 return 0;
1361 }
1362 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size());
1363 NOT_LP64(ShouldNotReachHere(); return 0);
1364 }
1365
1366 bool Arguments::should_auto_select_low_pause_collector() {
1367 if (UseAutoGCSelectPolicy &&
1368 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1369 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1370 if (PrintGCDetails) {
1371 // Cannot use gclog_or_tty yet.
1372 tty->print_cr("Automatic selection of the low pause collector"
1373 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1374 }
1375 return true;
1376 }
1377 return false;
1378 }
1379
1380 void Arguments::set_use_compressed_oops() {
1381 #ifndef ZERO
1382 #ifdef _LP64
1383 // MaxHeapSize is not set up properly at this point, but
1384 // the only value that can override MaxHeapSize if we are
1385 // to use UseCompressedOops is InitialHeapSize.
1386 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1387
1388 if (max_heap_size <= max_heap_for_compressed_oops()) {
1389 #if !defined(COMPILER1) || defined(TIERED)
1390 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1391 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1392 }
1393 #endif
1394 #ifdef _WIN64
1395 if (UseLargePages && UseCompressedOops) {
1396 // Cannot allocate guard pages for implicit checks in indexed addressing
1397 // mode, when large pages are specified on windows.
1398 // This flag could be switched ON if narrow oop base address is set to 0,
1399 // see code in Universe::initialize_heap().
1400 Universe::set_narrow_oop_use_implicit_null_checks(false);
1401 }
1402 #endif // _WIN64
1403 } else {
1404 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1405 warning("Max heap size too large for Compressed Oops");
1406 FLAG_SET_DEFAULT(UseCompressedOops, false);
1407 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1408 }
1409 }
1410 #endif // _LP64
1411 #endif // ZERO
1412 }
1413
1414 void Arguments::set_ergonomics_flags() {
1415
1416 if (os::is_server_class_machine()) {
1417 // If no other collector is requested explicitly,
1418 // let the VM select the collector based on
1419 // machine class and automatic selection policy.
1420 if (!UseSerialGC &&
1421 !UseConcMarkSweepGC &&
1422 !UseG1GC &&
1423 !UseParNewGC &&
1424 FLAG_IS_DEFAULT(UseParallelGC)) {
1425 if (should_auto_select_low_pause_collector()) {
1426 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1427 } else {
1428 FLAG_SET_ERGO(bool, UseParallelGC, true);
1429 }
1430 }
1431 // Shared spaces work fine with other GCs but causes bytecode rewriting
1432 // to be disabled, which hurts interpreter performance and decreases
1433 // server performance. On server class machines, keep the default
1434 // off unless it is asked for. Future work: either add bytecode rewriting
1435 // at link time, or rewrite bytecodes in non-shared methods.
1436 if (!DumpSharedSpaces && !RequireSharedSpaces) {
1437 no_shared_spaces();
1438 }
1439 }
1440
1441 #ifndef ZERO
1442 #ifdef _LP64
1443 set_use_compressed_oops();
1444 // UseCompressedOops must be on for UseCompressedKlassPointers to be on.
1445 if (!UseCompressedOops) {
1446 if (UseCompressedKlassPointers) {
1447 warning("UseCompressedKlassPointers requires UseCompressedOops");
1448 }
1449 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1450 } else {
1451 // Turn on UseCompressedKlassPointers too
1452 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) {
1453 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true);
1454 }
1455 // Set the ClassMetaspaceSize to something that will not need to be
1456 // expanded, since it cannot be expanded.
1457 if (UseCompressedKlassPointers) {
1458 if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) {
1459 warning("Class metaspace size is too large for UseCompressedKlassPointers");
1460 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1461 } else if (FLAG_IS_DEFAULT(ClassMetaspaceSize)) {
1462 // 100,000 classes seems like a good size, so 100M assumes around 1K
1463 // per klass. The vtable and oopMap is embedded so we don't have a fixed
1464 // size per klass. Eventually, this will be parameterized because it
1465 // would also be useful to determine the optimal size of the
1466 // systemDictionary.
1467 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M);
1468 }
1469 }
1470 }
1471 // Also checks that certain machines are slower with compressed oops
1472 // in vm_version initialization code.
1473 #endif // _LP64
1474 #endif // !ZERO
1475 }
1476
1477 void Arguments::set_parallel_gc_flags() {
1478 assert(UseParallelGC || UseParallelOldGC, "Error");
1479 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1480 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1481 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1482 }
1483 FLAG_SET_DEFAULT(UseParallelGC, true);
1484
1485 // If no heap maximum was requested explicitly, use some reasonable fraction
1486 // of the physical memory, up to a maximum of 1GB.
1487 FLAG_SET_DEFAULT(ParallelGCThreads,
1488 Abstract_VM_Version::parallel_worker_threads());
1489 if (ParallelGCThreads == 0) {
1490 jio_fprintf(defaultStream::error_stream(),
1491 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1492 vm_exit(1);
1493 }
1494
1495
1496 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1497 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1498 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1499 // See CR 6362902 for details.
1500 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1501 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1502 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1503 }
1504 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1505 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1506 }
1507 }
1508
1509 if (UseParallelOldGC) {
1510 // Par compact uses lower default values since they are treated as
1511 // minimums. These are different defaults because of the different
1512 // interpretation and are not ergonomically set.
1513 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1514 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1515 }
1516 }
1517 }
1518
1519 void Arguments::set_g1_gc_flags() {
1520 assert(UseG1GC, "Error");
1521 #ifdef COMPILER1
1522 FastTLABRefill = false;
1523 #endif
1524 FLAG_SET_DEFAULT(ParallelGCThreads,
1525 Abstract_VM_Version::parallel_worker_threads());
1526 if (ParallelGCThreads == 0) {
1527 FLAG_SET_DEFAULT(ParallelGCThreads,
1528 Abstract_VM_Version::parallel_worker_threads());
1529 }
1530
1531 // MarkStackSize will be set (if it hasn't been set by the user)
1532 // when concurrent marking is initialized.
1533 // Its value will be based upon the number of parallel marking threads.
1534 // But we do set the maximum mark stack size here.
1535 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1536 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1537 }
1538
1539 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1540 // In G1, we want the default GC overhead goal to be higher than
1541 // say in PS. So we set it here to 10%. Otherwise the heap might
1542 // be expanded more aggressively than we would like it to. In
1543 // fact, even 10% seems to not be high enough in some cases
1544 // (especially small GC stress tests that the main thing they do
1545 // is allocation). We might consider increase it further.
1546 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1547 }
1548
1549 if (PrintGCDetails && Verbose) {
1550 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1551 MarkStackSize / K, MarkStackSizeMax / K);
1552 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1553 }
1554 }
1555
1556 julong Arguments::limit_by_allocatable_memory(julong limit) {
1557 julong max_allocatable;
1558 julong result = limit;
1559 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1560 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1561 }
1562 return result;
1563 }
1564
1565 void Arguments::set_heap_size() {
1566 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1567 // Deprecated flag
1568 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1569 }
1570
1571 const julong phys_mem =
1572 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1573 : (julong)MaxRAM;
1574
1575 // If the maximum heap size has not been set with -Xmx,
1576 // then set it as fraction of the size of physical memory,
1577 // respecting the maximum and minimum sizes of the heap.
1578 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1579 julong reasonable_max = phys_mem / MaxRAMFraction;
1580
1581 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1582 // Small physical memory, so use a minimum fraction of it for the heap
1583 reasonable_max = phys_mem / MinRAMFraction;
1584 } else {
1585 // Not-small physical memory, so require a heap at least
1586 // as large as MaxHeapSize
1587 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1588 }
1589 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1590 // Limit the heap size to ErgoHeapSizeLimit
1591 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1592 }
1593 if (UseCompressedOops) {
1594 // Limit the heap size to the maximum possible when using compressed oops
1595 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1596 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1597 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1598 // but it should be not less than default MaxHeapSize.
1599 max_coop_heap -= HeapBaseMinAddress;
1600 }
1601 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1602 }
1603 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1604
1605 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1606 // An initial heap size was specified on the command line,
1607 // so be sure that the maximum size is consistent. Done
1608 // after call to limit_by_allocatable_memory because that
1609 // method might reduce the allocation size.
1610 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1611 }
1612
1613 if (PrintGCDetails && Verbose) {
1614 // Cannot use gclog_or_tty yet.
1615 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1616 }
1617 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1618 }
1619
1620 // If the minimum or initial heap_size have not been set or requested to be set
1621 // ergonomically, set them accordingly.
1622 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1623 julong reasonable_minimum = (julong)(OldSize + NewSize);
1624
1625 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1626
1627 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1628
1629 if (InitialHeapSize == 0) {
1630 julong reasonable_initial = phys_mem / InitialRAMFraction;
1631
1632 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1633 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1634
1635 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1636
1637 if (PrintGCDetails && Verbose) {
1638 // Cannot use gclog_or_tty yet.
1639 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1640 }
1641 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1642 }
1643 // If the minimum heap size has not been set (via -Xms),
1644 // synchronize with InitialHeapSize to avoid errors with the default value.
1645 if (min_heap_size() == 0) {
1646 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1647 if (PrintGCDetails && Verbose) {
1648 // Cannot use gclog_or_tty yet.
1649 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1650 }
1651 }
1652 }
1653 }
1654
1655 // This must be called after ergonomics because we want bytecode rewriting
1656 // if the server compiler is used, or if UseSharedSpaces is disabled.
1657 void Arguments::set_bytecode_flags() {
1658 // Better not attempt to store into a read-only space.
1659 if (UseSharedSpaces) {
1660 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1661 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1662 }
1663
1664 if (!RewriteBytecodes) {
1665 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1666 }
1667 }
1668
1669 // Aggressive optimization flags -XX:+AggressiveOpts
1670 void Arguments::set_aggressive_opts_flags() {
1671 #ifdef COMPILER2
1672 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1673 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1674 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1675 }
1676 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1677 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1678 }
1679
1680 // Feed the cache size setting into the JDK
1681 char buffer[1024];
1682 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1683 add_property(buffer);
1684 }
1685 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1686 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1687 }
1688 #endif
1689
1690 if (AggressiveOpts) {
1691 // Sample flag setting code
1692 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1693 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1694 // }
1695 }
1696 }
1697
1698 //===========================================================================================================
1699 // Parsing of java.compiler property
1700
1701 void Arguments::process_java_compiler_argument(char* arg) {
1702 // For backwards compatibility, Djava.compiler=NONE or ""
1703 // causes us to switch to -Xint mode UNLESS -Xdebug
1704 // is also specified.
1705 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1706 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1707 }
1708 }
1709
1710 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1711 _sun_java_launcher = strdup(launcher);
1712 if (strcmp("gamma", _sun_java_launcher) == 0) {
1713 _created_by_gamma_launcher = true;
1714 }
1715 }
1716
1717 bool Arguments::created_by_java_launcher() {
1718 assert(_sun_java_launcher != NULL, "property must have value");
1719 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1720 }
1721
1722 bool Arguments::created_by_gamma_launcher() {
1723 return _created_by_gamma_launcher;
1724 }
1725
1726 //===========================================================================================================
1727 // Parsing of main arguments
1728
1729 bool Arguments::verify_interval(uintx val, uintx min,
1730 uintx max, const char* name) {
1731 // Returns true iff value is in the inclusive interval [min..max]
1732 // false, otherwise.
1733 if (val >= min && val <= max) {
1734 return true;
1735 }
1736 jio_fprintf(defaultStream::error_stream(),
1737 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1738 " and " UINTX_FORMAT "\n",
1739 name, val, min, max);
1740 return false;
1741 }
1742
1743 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1744 // Returns true if given value is at least specified min threshold
1745 // false, otherwise.
1746 if (val >= min ) {
1747 return true;
1748 }
1749 jio_fprintf(defaultStream::error_stream(),
1750 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1751 name, val, min);
1752 return false;
1753 }
1754
1755 bool Arguments::verify_percentage(uintx value, const char* name) {
1756 if (value <= 100) {
1757 return true;
1758 }
1759 jio_fprintf(defaultStream::error_stream(),
1760 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1761 name, value);
1762 return false;
1763 }
1764
1765 #if !INCLUDE_ALL_GCS
1766 #ifdef ASSERT
1767 static bool verify_serial_gc_flags() {
1768 return (UseSerialGC &&
1769 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1770 UseParallelGC || UseParallelOldGC));
1771 }
1772 #endif // ASSERT
1773 #endif // INCLUDE_ALL_GCS
1774
1775 // check if do gclog rotation
1776 // +UseGCLogFileRotation is a must,
1777 // no gc log rotation when log file not supplied or
1778 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1779 void check_gclog_consistency() {
1780 if (UseGCLogFileRotation) {
1781 if ((Arguments::gc_log_filename() == NULL) ||
1782 (NumberOfGCLogFiles == 0) ||
1783 (GCLogFileSize == 0)) {
1784 jio_fprintf(defaultStream::output_stream(),
1785 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1786 "where num_of_file > 0 and num_of_size > 0\n"
1787 "GC log rotation is turned off\n");
1788 UseGCLogFileRotation = false;
1789 }
1790 }
1791
1792 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1793 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1794 jio_fprintf(defaultStream::output_stream(),
1795 "GCLogFileSize changed to minimum 8K\n");
1796 }
1797 }
1798
1799 // Check consistency of GC selection
1800 bool Arguments::check_gc_consistency() {
1801 check_gclog_consistency();
1802 bool status = true;
1803 // Ensure that the user has not selected conflicting sets
1804 // of collectors. [Note: this check is merely a user convenience;
1805 // collectors over-ride each other so that only a non-conflicting
1806 // set is selected; however what the user gets is not what they
1807 // may have expected from the combination they asked for. It's
1808 // better to reduce user confusion by not allowing them to
1809 // select conflicting combinations.
1810 uint i = 0;
1811 if (UseSerialGC) i++;
1812 if (UseConcMarkSweepGC || UseParNewGC) i++;
1813 if (UseParallelGC || UseParallelOldGC) i++;
1814 if (UseG1GC) i++;
1815 if (i > 1) {
1816 jio_fprintf(defaultStream::error_stream(),
1817 "Conflicting collector combinations in option list; "
1818 "please refer to the release notes for the combinations "
1819 "allowed\n");
1820 status = false;
1821 }
1822
1823 return status;
1824 }
1825
1826 void Arguments::check_deprecated_gcs() {
1827 if (UseConcMarkSweepGC && !UseParNewGC) {
1828 warning("Using the DefNew young collector with the CMS collector is deprecated "
1829 "and will likely be removed in a future release");
1830 }
1831
1832 if (UseParNewGC && !UseConcMarkSweepGC) {
1833 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1834 // set up UseSerialGC properly, so that can't be used in the check here.
1835 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1836 "and will likely be removed in a future release");
1837 }
1838
1839 if (CMSIncrementalMode) {
1840 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1841 }
1842 }
1843
1844 void Arguments::check_deprecated_gc_flags() {
1845 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
1846 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
1847 "and will likely be removed in future release");
1848 }
1849 }
1850
1851 // Check stack pages settings
1852 bool Arguments::check_stack_pages()
1853 {
1854 bool status = true;
1855 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1856 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1857 // greater stack shadow pages can't generate instruction to bang stack
1858 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1859 return status;
1860 }
1861
1862 // Check the consistency of vm_init_args
1863 bool Arguments::check_vm_args_consistency() {
1864 // Method for adding checks for flag consistency.
1865 // The intent is to warn the user of all possible conflicts,
1866 // before returning an error.
1867 // Note: Needs platform-dependent factoring.
1868 bool status = true;
1869
1870 #if ( (defined(COMPILER2) && defined(SPARC)))
1871 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1872 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1873 // x86. Normally, VM_Version_init must be called from init_globals in
1874 // init.cpp, which is called by the initial java thread *after* arguments
1875 // have been parsed. VM_Version_init gets called twice on sparc.
1876 extern void VM_Version_init();
1877 VM_Version_init();
1878 if (!VM_Version::has_v9()) {
1879 jio_fprintf(defaultStream::error_stream(),
1880 "V8 Machine detected, Server requires V9\n");
1881 status = false;
1882 }
1883 #endif /* COMPILER2 && SPARC */
1884
1885 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1886 // builds so the cost of stack banging can be measured.
1887 #if (defined(PRODUCT) && defined(SOLARIS))
1888 if (!UseBoundThreads && !UseStackBanging) {
1889 jio_fprintf(defaultStream::error_stream(),
1890 "-UseStackBanging conflicts with -UseBoundThreads\n");
1891
1892 status = false;
1893 }
1894 #endif
1895
1896 if (TLABRefillWasteFraction == 0) {
1897 jio_fprintf(defaultStream::error_stream(),
1898 "TLABRefillWasteFraction should be a denominator, "
1899 "not " SIZE_FORMAT "\n",
1900 TLABRefillWasteFraction);
1901 status = false;
1902 }
1903
1904 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1905 "AdaptiveSizePolicyWeight");
1906 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1907 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1908 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1909
1910 // Divide by bucket size to prevent a large size from causing rollover when
1911 // calculating amount of memory needed to be allocated for the String table.
1912 status = status && verify_interval(StringTableSize, minimumStringTableSize,
1913 (max_uintx / StringTable::bucket_size()), "StringTable size");
1914
1915 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1916 jio_fprintf(defaultStream::error_stream(),
1917 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1918 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1919 MinHeapFreeRatio, MaxHeapFreeRatio);
1920 status = false;
1921 }
1922 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1923 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1924
1925 // Min/MaxMetaspaceFreeRatio
1926 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
1927 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
1928
1929 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
1930 jio_fprintf(defaultStream::error_stream(),
1931 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
1932 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
1933 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
1934 MinMetaspaceFreeRatio,
1935 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
1936 MaxMetaspaceFreeRatio);
1937 status = false;
1938 }
1939
1940 // Trying to keep 100% free is not practical
1941 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
1942
1943 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1944 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1945 }
1946
1947 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1948 // Settings to encourage splitting.
1949 if (!FLAG_IS_CMDLINE(NewRatio)) {
1950 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
1951 }
1952 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1953 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1954 }
1955 }
1956
1957 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1958 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1959 if (GCTimeLimit == 100) {
1960 // Turn off gc-overhead-limit-exceeded checks
1961 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1962 }
1963
1964 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1965
1966 status = status && check_gc_consistency();
1967 status = status && check_stack_pages();
1968
1969 if (_has_alloc_profile) {
1970 if (UseParallelGC || UseParallelOldGC) {
1971 jio_fprintf(defaultStream::error_stream(),
1972 "error: invalid argument combination.\n"
1973 "Allocation profiling (-Xaprof) cannot be used together with "
1974 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1975 status = false;
1976 }
1977 if (UseConcMarkSweepGC) {
1978 jio_fprintf(defaultStream::error_stream(),
1979 "error: invalid argument combination.\n"
1980 "Allocation profiling (-Xaprof) cannot be used together with "
1981 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1982 status = false;
1983 }
1984 }
1985
1986 if (CMSIncrementalMode) {
1987 if (!UseConcMarkSweepGC) {
1988 jio_fprintf(defaultStream::error_stream(),
1989 "error: invalid argument combination.\n"
1990 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1991 "selected in order\nto use CMSIncrementalMode.\n");
1992 status = false;
1993 } else {
1994 status = status && verify_percentage(CMSIncrementalDutyCycle,
1995 "CMSIncrementalDutyCycle");
1996 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1997 "CMSIncrementalDutyCycleMin");
1998 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1999 "CMSIncrementalSafetyFactor");
2000 status = status && verify_percentage(CMSIncrementalOffset,
2001 "CMSIncrementalOffset");
2002 status = status && verify_percentage(CMSExpAvgFactor,
2003 "CMSExpAvgFactor");
2004 // If it was not set on the command line, set
2005 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2006 if (CMSInitiatingOccupancyFraction < 0) {
2007 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2008 }
2009 }
2010 }
2011
2012 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2013 // insists that we hold the requisite locks so that the iteration is
2014 // MT-safe. For the verification at start-up and shut-down, we don't
2015 // yet have a good way of acquiring and releasing these locks,
2016 // which are not visible at the CollectedHeap level. We want to
2017 // be able to acquire these locks and then do the iteration rather
2018 // than just disable the lock verification. This will be fixed under
2019 // bug 4788986.
2020 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2021 if (VerifyDuringStartup) {
2022 warning("Heap verification at start-up disabled "
2023 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2024 VerifyDuringStartup = false; // Disable verification at start-up
2025 }
2026
2027 if (VerifyBeforeExit) {
2028 warning("Heap verification at shutdown disabled "
2029 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2030 VerifyBeforeExit = false; // Disable verification at shutdown
2031 }
2032 }
2033
2034 // Note: only executed in non-PRODUCT mode
2035 if (!UseAsyncConcMarkSweepGC &&
2036 (ExplicitGCInvokesConcurrent ||
2037 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2038 jio_fprintf(defaultStream::error_stream(),
2039 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2040 " with -UseAsyncConcMarkSweepGC");
2041 status = false;
2042 }
2043
2044 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2045
2046 #if INCLUDE_ALL_GCS
2047 if (UseG1GC) {
2048 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2049 "InitiatingHeapOccupancyPercent");
2050 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2051 "G1RefProcDrainInterval");
2052 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2053 "G1ConcMarkStepDurationMillis");
2054 }
2055 #endif // INCLUDE_ALL_GCS
2056
2057 status = status && verify_interval(RefDiscoveryPolicy,
2058 ReferenceProcessor::DiscoveryPolicyMin,
2059 ReferenceProcessor::DiscoveryPolicyMax,
2060 "RefDiscoveryPolicy");
2061
2062 // Limit the lower bound of this flag to 1 as it is used in a division
2063 // expression.
2064 status = status && verify_interval(TLABWasteTargetPercent,
2065 1, 100, "TLABWasteTargetPercent");
2066
2067 status = status && verify_object_alignment();
2068
2069 status = status && verify_min_value(ClassMetaspaceSize, 1*M,
2070 "ClassMetaspaceSize");
2071
2072 status = status && verify_interval(MarkStackSizeMax,
2073 1, (max_jint - 1), "MarkStackSizeMax");
2074
2075 #ifdef SPARC
2076 if (UseConcMarkSweepGC || UseG1GC) {
2077 // Issue a stern warning if the user has explicitly set
2078 // UseMemSetInBOT (it is known to cause issues), but allow
2079 // use for experimentation and debugging.
2080 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2081 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2082 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2083 " on sun4v; please understand that you are using at your own risk!");
2084 }
2085 }
2086 #endif // SPARC
2087
2088 if (PrintNMTStatistics) {
2089 #if INCLUDE_NMT
2090 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2091 #endif // INCLUDE_NMT
2092 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2093 PrintNMTStatistics = false;
2094 #if INCLUDE_NMT
2095 }
2096 #endif
2097 }
2098
2099 return status;
2100 }
2101
2102 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2103 const char* option_type) {
2104 if (ignore) return false;
2105
2106 const char* spacer = " ";
2107 if (option_type == NULL) {
2108 option_type = ++spacer; // Set both to the empty string.
2109 }
2110
2111 if (os::obsolete_option(option)) {
2112 jio_fprintf(defaultStream::error_stream(),
2113 "Obsolete %s%soption: %s\n", option_type, spacer,
2114 option->optionString);
2115 return false;
2116 } else {
2117 jio_fprintf(defaultStream::error_stream(),
2118 "Unrecognized %s%soption: %s\n", option_type, spacer,
2119 option->optionString);
2120 return true;
2121 }
2122 }
2123
2124 static const char* user_assertion_options[] = {
2125 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2126 };
2127
2128 static const char* system_assertion_options[] = {
2129 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2130 };
2131
2132 // Return true if any of the strings in null-terminated array 'names' matches.
2133 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2134 // the option must match exactly.
2135 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2136 bool tail_allowed) {
2137 for (/* empty */; *names != NULL; ++names) {
2138 if (match_option(option, *names, tail)) {
2139 if (**tail == '\0' || tail_allowed && **tail == ':') {
2140 return true;
2141 }
2142 }
2143 }
2144 return false;
2145 }
2146
2147 bool Arguments::parse_uintx(const char* value,
2148 uintx* uintx_arg,
2149 uintx min_size) {
2150
2151 // Check the sign first since atomull() parses only unsigned values.
2152 bool value_is_positive = !(*value == '-');
2153
2154 if (value_is_positive) {
2155 julong n;
2156 bool good_return = atomull(value, &n);
2157 if (good_return) {
2158 bool above_minimum = n >= min_size;
2159 bool value_is_too_large = n > max_uintx;
2160
2161 if (above_minimum && !value_is_too_large) {
2162 *uintx_arg = n;
2163 return true;
2164 }
2165 }
2166 }
2167 return false;
2168 }
2169
2170 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2171 julong* long_arg,
2172 julong min_size) {
2173 if (!atomull(s, long_arg)) return arg_unreadable;
2174 return check_memory_size(*long_arg, min_size);
2175 }
2176
2177 // Parse JavaVMInitArgs structure
2178
2179 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2180 // For components of the system classpath.
2181 SysClassPath scp(Arguments::get_sysclasspath());
2182 bool scp_assembly_required = false;
2183
2184 // Save default settings for some mode flags
2185 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2186 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2187 Arguments::_ClipInlining = ClipInlining;
2188 Arguments::_BackgroundCompilation = BackgroundCompilation;
2189
2190 // Setup flags for mixed which is the default
2191 set_mode_flags(_mixed);
2192
2193 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2194 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2195 if (result != JNI_OK) {
2196 return result;
2197 }
2198
2199 // Parse JavaVMInitArgs structure passed in
2200 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2201 if (result != JNI_OK) {
2202 return result;
2203 }
2204
2205 if (AggressiveOpts) {
2206 // Insert alt-rt.jar between user-specified bootclasspath
2207 // prefix and the default bootclasspath. os::set_boot_path()
2208 // uses meta_index_dir as the default bootclasspath directory.
2209 const char* altclasses_jar = "alt-rt.jar";
2210 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2211 strlen(altclasses_jar);
2212 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2213 strcpy(altclasses_path, get_meta_index_dir());
2214 strcat(altclasses_path, altclasses_jar);
2215 scp.add_suffix_to_prefix(altclasses_path);
2216 scp_assembly_required = true;
2217 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2218 }
2219
2220 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2221 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2222 if (result != JNI_OK) {
2223 return result;
2224 }
2225
2226 // Do final processing now that all arguments have been parsed
2227 result = finalize_vm_init_args(&scp, scp_assembly_required);
2228 if (result != JNI_OK) {
2229 return result;
2230 }
2231
2232 return JNI_OK;
2233 }
2234
2235 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2236 SysClassPath* scp_p,
2237 bool* scp_assembly_required_p,
2238 FlagValueOrigin origin) {
2239 // Remaining part of option string
2240 const char* tail;
2241
2242 // iterate over arguments
2243 for (int index = 0; index < args->nOptions; index++) {
2244 bool is_absolute_path = false; // for -agentpath vs -agentlib
2245
2246 const JavaVMOption* option = args->options + index;
2247
2248 if (!match_option(option, "-Djava.class.path", &tail) &&
2249 !match_option(option, "-Dsun.java.command", &tail) &&
2250 !match_option(option, "-Dsun.java.launcher", &tail)) {
2251
2252 // add all jvm options to the jvm_args string. This string
2253 // is used later to set the java.vm.args PerfData string constant.
2254 // the -Djava.class.path and the -Dsun.java.command options are
2255 // omitted from jvm_args string as each have their own PerfData
2256 // string constant object.
2257 build_jvm_args(option->optionString);
2258 }
2259
2260 // -verbose:[class/gc/jni]
2261 if (match_option(option, "-verbose", &tail)) {
2262 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2263 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2264 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2265 } else if (!strcmp(tail, ":gc")) {
2266 FLAG_SET_CMDLINE(bool, PrintGC, true);
2267 } else if (!strcmp(tail, ":jni")) {
2268 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2269 }
2270 // -da / -ea / -disableassertions / -enableassertions
2271 // These accept an optional class/package name separated by a colon, e.g.,
2272 // -da:java.lang.Thread.
2273 } else if (match_option(option, user_assertion_options, &tail, true)) {
2274 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2275 if (*tail == '\0') {
2276 JavaAssertions::setUserClassDefault(enable);
2277 } else {
2278 assert(*tail == ':', "bogus match by match_option()");
2279 JavaAssertions::addOption(tail + 1, enable);
2280 }
2281 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2282 } else if (match_option(option, system_assertion_options, &tail, false)) {
2283 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2284 JavaAssertions::setSystemClassDefault(enable);
2285 // -bootclasspath:
2286 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2287 scp_p->reset_path(tail);
2288 *scp_assembly_required_p = true;
2289 // -bootclasspath/a:
2290 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2291 scp_p->add_suffix(tail);
2292 *scp_assembly_required_p = true;
2293 // -bootclasspath/p:
2294 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2295 scp_p->add_prefix(tail);
2296 *scp_assembly_required_p = true;
2297 // -Xrun
2298 } else if (match_option(option, "-Xrun", &tail)) {
2299 if (tail != NULL) {
2300 const char* pos = strchr(tail, ':');
2301 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2302 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2303 name[len] = '\0';
2304
2305 char *options = NULL;
2306 if(pos != NULL) {
2307 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2308 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2309 }
2310 #if !INCLUDE_JVMTI
2311 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2312 jio_fprintf(defaultStream::error_stream(),
2313 "Profiling and debugging agents are not supported in this VM\n");
2314 return JNI_ERR;
2315 }
2316 #endif // !INCLUDE_JVMTI
2317 add_init_library(name, options);
2318 }
2319 // -agentlib and -agentpath
2320 } else if (match_option(option, "-agentlib:", &tail) ||
2321 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2322 if(tail != NULL) {
2323 const char* pos = strchr(tail, '=');
2324 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2325 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2326 name[len] = '\0';
2327
2328 char *options = NULL;
2329 if(pos != NULL) {
2330 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2331 }
2332 #if !INCLUDE_JVMTI
2333 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2334 jio_fprintf(defaultStream::error_stream(),
2335 "Profiling and debugging agents are not supported in this VM\n");
2336 return JNI_ERR;
2337 }
2338 #endif // !INCLUDE_JVMTI
2339 add_init_agent(name, options, is_absolute_path);
2340 }
2341 // -javaagent
2342 } else if (match_option(option, "-javaagent:", &tail)) {
2343 #if !INCLUDE_JVMTI
2344 jio_fprintf(defaultStream::error_stream(),
2345 "Instrumentation agents are not supported in this VM\n");
2346 return JNI_ERR;
2347 #else
2348 if(tail != NULL) {
2349 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2350 add_init_agent("instrument", options, false);
2351 }
2352 #endif // !INCLUDE_JVMTI
2353 // -Xnoclassgc
2354 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2355 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2356 // -Xincgc: i-CMS
2357 } else if (match_option(option, "-Xincgc", &tail)) {
2358 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2359 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2360 // -Xnoincgc: no i-CMS
2361 } else if (match_option(option, "-Xnoincgc", &tail)) {
2362 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2363 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2364 // -Xconcgc
2365 } else if (match_option(option, "-Xconcgc", &tail)) {
2366 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2367 // -Xnoconcgc
2368 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2369 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2370 // -Xbatch
2371 } else if (match_option(option, "-Xbatch", &tail)) {
2372 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2373 // -Xmn for compatibility with other JVM vendors
2374 } else if (match_option(option, "-Xmn", &tail)) {
2375 julong long_initial_eden_size = 0;
2376 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2377 if (errcode != arg_in_range) {
2378 jio_fprintf(defaultStream::error_stream(),
2379 "Invalid initial eden size: %s\n", option->optionString);
2380 describe_range_error(errcode);
2381 return JNI_EINVAL;
2382 }
2383 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2384 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2385 // -Xms
2386 } else if (match_option(option, "-Xms", &tail)) {
2387 julong long_initial_heap_size = 0;
2388 // an initial heap size of 0 means automatically determine
2389 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2390 if (errcode != arg_in_range) {
2391 jio_fprintf(defaultStream::error_stream(),
2392 "Invalid initial heap size: %s\n", option->optionString);
2393 describe_range_error(errcode);
2394 return JNI_EINVAL;
2395 }
2396 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2397 // Currently the minimum size and the initial heap sizes are the same.
2398 set_min_heap_size(InitialHeapSize);
2399 // -Xmx
2400 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2401 julong long_max_heap_size = 0;
2402 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2403 if (errcode != arg_in_range) {
2404 jio_fprintf(defaultStream::error_stream(),
2405 "Invalid maximum heap size: %s\n", option->optionString);
2406 describe_range_error(errcode);
2407 return JNI_EINVAL;
2408 }
2409 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2410 // Xmaxf
2411 } else if (match_option(option, "-Xmaxf", &tail)) {
2412 int maxf = (int)(atof(tail) * 100);
2413 if (maxf < 0 || maxf > 100) {
2414 jio_fprintf(defaultStream::error_stream(),
2415 "Bad max heap free percentage size: %s\n",
2416 option->optionString);
2417 return JNI_EINVAL;
2418 } else {
2419 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2420 }
2421 // Xminf
2422 } else if (match_option(option, "-Xminf", &tail)) {
2423 int minf = (int)(atof(tail) * 100);
2424 if (minf < 0 || minf > 100) {
2425 jio_fprintf(defaultStream::error_stream(),
2426 "Bad min heap free percentage size: %s\n",
2427 option->optionString);
2428 return JNI_EINVAL;
2429 } else {
2430 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2431 }
2432 // -Xss
2433 } else if (match_option(option, "-Xss", &tail)) {
2434 julong long_ThreadStackSize = 0;
2435 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2436 if (errcode != arg_in_range) {
2437 jio_fprintf(defaultStream::error_stream(),
2438 "Invalid thread stack size: %s\n", option->optionString);
2439 describe_range_error(errcode);
2440 return JNI_EINVAL;
2441 }
2442 // Internally track ThreadStackSize in units of 1024 bytes.
2443 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2444 round_to((int)long_ThreadStackSize, K) / K);
2445 // -Xoss
2446 } else if (match_option(option, "-Xoss", &tail)) {
2447 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2448 // -Xmaxjitcodesize
2449 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2450 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2451 julong long_ReservedCodeCacheSize = 0;
2452 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2453 (size_t)InitialCodeCacheSize);
2454 if (errcode != arg_in_range) {
2455 jio_fprintf(defaultStream::error_stream(),
2456 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2457 option->optionString, InitialCodeCacheSize/K);
2458 describe_range_error(errcode);
2459 return JNI_EINVAL;
2460 }
2461 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2462 // -green
2463 } else if (match_option(option, "-green", &tail)) {
2464 jio_fprintf(defaultStream::error_stream(),
2465 "Green threads support not available\n");
2466 return JNI_EINVAL;
2467 // -native
2468 } else if (match_option(option, "-native", &tail)) {
2469 // HotSpot always uses native threads, ignore silently for compatibility
2470 // -Xsqnopause
2471 } else if (match_option(option, "-Xsqnopause", &tail)) {
2472 // EVM option, ignore silently for compatibility
2473 // -Xrs
2474 } else if (match_option(option, "-Xrs", &tail)) {
2475 // Classic/EVM option, new functionality
2476 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2477 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2478 // change default internal VM signals used - lower case for back compat
2479 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2480 // -Xoptimize
2481 } else if (match_option(option, "-Xoptimize", &tail)) {
2482 // EVM option, ignore silently for compatibility
2483 // -Xprof
2484 } else if (match_option(option, "-Xprof", &tail)) {
2485 #if INCLUDE_FPROF
2486 _has_profile = true;
2487 #else // INCLUDE_FPROF
2488 jio_fprintf(defaultStream::error_stream(),
2489 "Flat profiling is not supported in this VM.\n");
2490 return JNI_ERR;
2491 #endif // INCLUDE_FPROF
2492 // -Xaprof
2493 } else if (match_option(option, "-Xaprof", &tail)) {
2494 _has_alloc_profile = true;
2495 // -Xconcurrentio
2496 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2497 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2498 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2499 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2500 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2501 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2502
2503 // -Xinternalversion
2504 } else if (match_option(option, "-Xinternalversion", &tail)) {
2505 jio_fprintf(defaultStream::output_stream(), "%s\n",
2506 VM_Version::internal_vm_info_string());
2507 vm_exit(0);
2508 #ifndef PRODUCT
2509 // -Xprintflags
2510 } else if (match_option(option, "-Xprintflags", &tail)) {
2511 CommandLineFlags::printFlags(tty, false);
2512 vm_exit(0);
2513 #endif
2514 // -D
2515 } else if (match_option(option, "-D", &tail)) {
2516 if (!add_property(tail)) {
2517 return JNI_ENOMEM;
2518 }
2519 // Out of the box management support
2520 if (match_option(option, "-Dcom.sun.management", &tail)) {
2521 #if INCLUDE_MANAGEMENT
2522 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2523 #else
2524 jio_fprintf(defaultStream::output_stream(),
2525 "-Dcom.sun.management is not supported in this VM.\n");
2526 return JNI_ERR;
2527 #endif
2528 }
2529 // -Xint
2530 } else if (match_option(option, "-Xint", &tail)) {
2531 set_mode_flags(_int);
2532 // -Xmixed
2533 } else if (match_option(option, "-Xmixed", &tail)) {
2534 set_mode_flags(_mixed);
2535 // -Xcomp
2536 } else if (match_option(option, "-Xcomp", &tail)) {
2537 // for testing the compiler; turn off all flags that inhibit compilation
2538 set_mode_flags(_comp);
2539 // -Xshare:dump
2540 } else if (match_option(option, "-Xshare:dump", &tail)) {
2541 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2542 set_mode_flags(_int); // Prevent compilation, which creates objects
2543 // -Xshare:on
2544 } else if (match_option(option, "-Xshare:on", &tail)) {
2545 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2546 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2547 // -Xshare:auto
2548 } else if (match_option(option, "-Xshare:auto", &tail)) {
2549 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2550 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2551 // -Xshare:off
2552 } else if (match_option(option, "-Xshare:off", &tail)) {
2553 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2554 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2555 // -Xverify
2556 } else if (match_option(option, "-Xverify", &tail)) {
2557 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2558 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2559 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2560 } else if (strcmp(tail, ":remote") == 0) {
2561 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2562 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2563 } else if (strcmp(tail, ":none") == 0) {
2564 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2565 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2566 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2567 return JNI_EINVAL;
2568 }
2569 // -Xdebug
2570 } else if (match_option(option, "-Xdebug", &tail)) {
2571 // note this flag has been used, then ignore
2572 set_xdebug_mode(true);
2573 // -Xnoagent
2574 } else if (match_option(option, "-Xnoagent", &tail)) {
2575 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2576 } else if (match_option(option, "-Xboundthreads", &tail)) {
2577 // Bind user level threads to kernel threads (Solaris only)
2578 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2579 } else if (match_option(option, "-Xloggc:", &tail)) {
2580 // Redirect GC output to the file. -Xloggc:<filename>
2581 // ostream_init_log(), when called will use this filename
2582 // to initialize a fileStream.
2583 _gc_log_filename = strdup(tail);
2584 FLAG_SET_CMDLINE(bool, PrintGC, true);
2585 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2586
2587 // JNI hooks
2588 } else if (match_option(option, "-Xcheck", &tail)) {
2589 if (!strcmp(tail, ":jni")) {
2590 #if !INCLUDE_JNI_CHECK
2591 warning("JNI CHECKING is not supported in this VM");
2592 #else
2593 CheckJNICalls = true;
2594 #endif // INCLUDE_JNI_CHECK
2595 } else if (is_bad_option(option, args->ignoreUnrecognized,
2596 "check")) {
2597 return JNI_EINVAL;
2598 }
2599 } else if (match_option(option, "vfprintf", &tail)) {
2600 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2601 } else if (match_option(option, "exit", &tail)) {
2602 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2603 } else if (match_option(option, "abort", &tail)) {
2604 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2605 // -XX:+AggressiveHeap
2606 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2607
2608 // This option inspects the machine and attempts to set various
2609 // parameters to be optimal for long-running, memory allocation
2610 // intensive jobs. It is intended for machines with large
2611 // amounts of cpu and memory.
2612
2613 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2614 // VM, but we may not be able to represent the total physical memory
2615 // available (like having 8gb of memory on a box but using a 32bit VM).
2616 // Thus, we need to make sure we're using a julong for intermediate
2617 // calculations.
2618 julong initHeapSize;
2619 julong total_memory = os::physical_memory();
2620
2621 if (total_memory < (julong)256*M) {
2622 jio_fprintf(defaultStream::error_stream(),
2623 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2624 vm_exit(1);
2625 }
2626
2627 // The heap size is half of available memory, or (at most)
2628 // all of possible memory less 160mb (leaving room for the OS
2629 // when using ISM). This is the maximum; because adaptive sizing
2630 // is turned on below, the actual space used may be smaller.
2631
2632 initHeapSize = MIN2(total_memory / (julong)2,
2633 total_memory - (julong)160*M);
2634
2635 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2636
2637 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2638 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2639 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2640 // Currently the minimum size and the initial heap sizes are the same.
2641 set_min_heap_size(initHeapSize);
2642 }
2643 if (FLAG_IS_DEFAULT(NewSize)) {
2644 // Make the young generation 3/8ths of the total heap.
2645 FLAG_SET_CMDLINE(uintx, NewSize,
2646 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2647 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2648 }
2649
2650 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2651 FLAG_SET_DEFAULT(UseLargePages, true);
2652 #endif
2653
2654 // Increase some data structure sizes for efficiency
2655 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2656 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2657 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2658
2659 // See the OldPLABSize comment below, but replace 'after promotion'
2660 // with 'after copying'. YoungPLABSize is the size of the survivor
2661 // space per-gc-thread buffers. The default is 4kw.
2662 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2663
2664 // OldPLABSize is the size of the buffers in the old gen that
2665 // UseParallelGC uses to promote live data that doesn't fit in the
2666 // survivor spaces. At any given time, there's one for each gc thread.
2667 // The default size is 1kw. These buffers are rarely used, since the
2668 // survivor spaces are usually big enough. For specjbb, however, there
2669 // are occasions when there's lots of live data in the young gen
2670 // and we end up promoting some of it. We don't have a definite
2671 // explanation for why bumping OldPLABSize helps, but the theory
2672 // is that a bigger PLAB results in retaining something like the
2673 // original allocation order after promotion, which improves mutator
2674 // locality. A minor effect may be that larger PLABs reduce the
2675 // number of PLAB allocation events during gc. The value of 8kw
2676 // was arrived at by experimenting with specjbb.
2677 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2678
2679 // Enable parallel GC and adaptive generation sizing
2680 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2681 FLAG_SET_DEFAULT(ParallelGCThreads,
2682 Abstract_VM_Version::parallel_worker_threads());
2683
2684 // Encourage steady state memory management
2685 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2686
2687 // This appears to improve mutator locality
2688 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2689
2690 // Get around early Solaris scheduling bug
2691 // (affinity vs other jobs on system)
2692 // but disallow DR and offlining (5008695).
2693 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2694
2695 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2696 // The last option must always win.
2697 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2698 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2699 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2700 // The last option must always win.
2701 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2702 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2703 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2704 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2705 jio_fprintf(defaultStream::error_stream(),
2706 "Please use CMSClassUnloadingEnabled in place of "
2707 "CMSPermGenSweepingEnabled in the future\n");
2708 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2709 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2710 jio_fprintf(defaultStream::error_stream(),
2711 "Please use -XX:+UseGCOverheadLimit in place of "
2712 "-XX:+UseGCTimeLimit in the future\n");
2713 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2714 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2715 jio_fprintf(defaultStream::error_stream(),
2716 "Please use -XX:-UseGCOverheadLimit in place of "
2717 "-XX:-UseGCTimeLimit in the future\n");
2718 // The TLE options are for compatibility with 1.3 and will be
2719 // removed without notice in a future release. These options
2720 // are not to be documented.
2721 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2722 // No longer used.
2723 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2724 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2725 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2726 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2727 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2728 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2729 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2730 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2731 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2732 // No longer used.
2733 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2734 julong long_tlab_size = 0;
2735 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2736 if (errcode != arg_in_range) {
2737 jio_fprintf(defaultStream::error_stream(),
2738 "Invalid TLAB size: %s\n", option->optionString);
2739 describe_range_error(errcode);
2740 return JNI_EINVAL;
2741 }
2742 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2743 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2744 // No longer used.
2745 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2746 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2747 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2748 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2749 SOLARIS_ONLY(
2750 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2751 warning("-XX:+UsePermISM is obsolete.");
2752 FLAG_SET_CMDLINE(bool, UseISM, true);
2753 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2754 FLAG_SET_CMDLINE(bool, UseISM, false);
2755 )
2756 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2757 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2758 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2759 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2760 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2761 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2762 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2763 #if defined(DTRACE_ENABLED)
2764 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2765 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2766 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2767 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2768 #else // defined(DTRACE_ENABLED)
2769 jio_fprintf(defaultStream::error_stream(),
2770 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2771 return JNI_EINVAL;
2772 #endif // defined(DTRACE_ENABLED)
2773 #ifdef ASSERT
2774 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2775 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2776 // disable scavenge before parallel mark-compact
2777 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2778 #endif
2779 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2780 julong cms_blocks_to_claim = (julong)atol(tail);
2781 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2782 jio_fprintf(defaultStream::error_stream(),
2783 "Please use -XX:OldPLABSize in place of "
2784 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2785 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2786 julong cms_blocks_to_claim = (julong)atol(tail);
2787 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2788 jio_fprintf(defaultStream::error_stream(),
2789 "Please use -XX:OldPLABSize in place of "
2790 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2791 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2792 julong old_plab_size = 0;
2793 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2794 if (errcode != arg_in_range) {
2795 jio_fprintf(defaultStream::error_stream(),
2796 "Invalid old PLAB size: %s\n", option->optionString);
2797 describe_range_error(errcode);
2798 return JNI_EINVAL;
2799 }
2800 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2801 jio_fprintf(defaultStream::error_stream(),
2802 "Please use -XX:OldPLABSize in place of "
2803 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2804 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2805 julong young_plab_size = 0;
2806 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2807 if (errcode != arg_in_range) {
2808 jio_fprintf(defaultStream::error_stream(),
2809 "Invalid young PLAB size: %s\n", option->optionString);
2810 describe_range_error(errcode);
2811 return JNI_EINVAL;
2812 }
2813 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2814 jio_fprintf(defaultStream::error_stream(),
2815 "Please use -XX:YoungPLABSize in place of "
2816 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2817 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2818 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2819 julong stack_size = 0;
2820 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2821 if (errcode != arg_in_range) {
2822 jio_fprintf(defaultStream::error_stream(),
2823 "Invalid mark stack size: %s\n", option->optionString);
2824 describe_range_error(errcode);
2825 return JNI_EINVAL;
2826 }
2827 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2828 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2829 julong max_stack_size = 0;
2830 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2831 if (errcode != arg_in_range) {
2832 jio_fprintf(defaultStream::error_stream(),
2833 "Invalid maximum mark stack size: %s\n",
2834 option->optionString);
2835 describe_range_error(errcode);
2836 return JNI_EINVAL;
2837 }
2838 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2839 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2840 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2841 uintx conc_threads = 0;
2842 if (!parse_uintx(tail, &conc_threads, 1)) {
2843 jio_fprintf(defaultStream::error_stream(),
2844 "Invalid concurrent threads: %s\n", option->optionString);
2845 return JNI_EINVAL;
2846 }
2847 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2848 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
2849 julong max_direct_memory_size = 0;
2850 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
2851 if (errcode != arg_in_range) {
2852 jio_fprintf(defaultStream::error_stream(),
2853 "Invalid maximum direct memory size: %s\n",
2854 option->optionString);
2855 describe_range_error(errcode);
2856 return JNI_EINVAL;
2857 }
2858 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
2859 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
2860 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
2861 // away and will cause VM initialization failures!
2862 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
2863 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
2864 #if !INCLUDE_MANAGEMENT
2865 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
2866 jio_fprintf(defaultStream::error_stream(),
2867 "ManagementServer is not supported in this VM.\n");
2868 return JNI_ERR;
2869 #endif // INCLUDE_MANAGEMENT
2870 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2871 // Skip -XX:Flags= since that case has already been handled
2872 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2873 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2874 return JNI_EINVAL;
2875 }
2876 }
2877 // Unknown option
2878 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2879 return JNI_ERR;
2880 }
2881 }
2882
2883 // Change the default value for flags which have different default values
2884 // when working with older JDKs.
2885 #ifdef LINUX
2886 if (JDK_Version::current().compare_major(6) <= 0 &&
2887 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2888 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2889 }
2890 #endif // LINUX
2891 return JNI_OK;
2892 }
2893
2894 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2895 // This must be done after all -D arguments have been processed.
2896 scp_p->expand_endorsed();
2897
2898 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2899 // Assemble the bootclasspath elements into the final path.
2900 Arguments::set_sysclasspath(scp_p->combined_path());
2901 }
2902
2903 // This must be done after all arguments have been processed.
2904 // java_compiler() true means set to "NONE" or empty.
2905 if (java_compiler() && !xdebug_mode()) {
2906 // For backwards compatibility, we switch to interpreted mode if
2907 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2908 // not specified.
2909 set_mode_flags(_int);
2910 }
2911 if (CompileThreshold == 0) {
2912 set_mode_flags(_int);
2913 }
2914
2915 #ifndef COMPILER2
2916 // Don't degrade server performance for footprint
2917 if (FLAG_IS_DEFAULT(UseLargePages) &&
2918 MaxHeapSize < LargePageHeapSizeThreshold) {
2919 // No need for large granularity pages w/small heaps.
2920 // Note that large pages are enabled/disabled for both the
2921 // Java heap and the code cache.
2922 FLAG_SET_DEFAULT(UseLargePages, false);
2923 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2924 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2925 }
2926
2927 // Tiered compilation is undefined with C1.
2928 TieredCompilation = false;
2929 #else
2930 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2931 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2932 }
2933 #endif
2934
2935 // If we are running in a headless jre, force java.awt.headless property
2936 // to be true unless the property has already been set.
2937 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2938 if (os::is_headless_jre()) {
2939 const char* headless = Arguments::get_property("java.awt.headless");
2940 if (headless == NULL) {
2941 char envbuffer[128];
2942 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2943 if (!add_property("java.awt.headless=true")) {
2944 return JNI_ENOMEM;
2945 }
2946 } else {
2947 char buffer[256];
2948 strcpy(buffer, "java.awt.headless=");
2949 strcat(buffer, envbuffer);
2950 if (!add_property(buffer)) {
2951 return JNI_ENOMEM;
2952 }
2953 }
2954 }
2955 }
2956
2957 if (!check_vm_args_consistency()) {
2958 return JNI_ERR;
2959 }
2960
2961 return JNI_OK;
2962 }
2963
2964 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2965 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2966 scp_assembly_required_p);
2967 }
2968
2969 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2970 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2971 scp_assembly_required_p);
2972 }
2973
2974 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2975 const int N_MAX_OPTIONS = 64;
2976 const int OPTION_BUFFER_SIZE = 1024;
2977 char buffer[OPTION_BUFFER_SIZE];
2978
2979 // The variable will be ignored if it exceeds the length of the buffer.
2980 // Don't check this variable if user has special privileges
2981 // (e.g. unix su command).
2982 if (os::getenv(name, buffer, sizeof(buffer)) &&
2983 !os::have_special_privileges()) {
2984 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2985 jio_fprintf(defaultStream::error_stream(),
2986 "Picked up %s: %s\n", name, buffer);
2987 char* rd = buffer; // pointer to the input string (rd)
2988 int i;
2989 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2990 while (isspace(*rd)) rd++; // skip whitespace
2991 if (*rd == 0) break; // we re done when the input string is read completely
2992
2993 // The output, option string, overwrites the input string.
2994 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2995 // input string (rd).
2996 char* wrt = rd;
2997
2998 options[i++].optionString = wrt; // Fill in option
2999 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3000 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3001 int quote = *rd; // matching quote to look for
3002 rd++; // don't copy open quote
3003 while (*rd != quote) { // include everything (even spaces) up until quote
3004 if (*rd == 0) { // string termination means unmatched string
3005 jio_fprintf(defaultStream::error_stream(),
3006 "Unmatched quote in %s\n", name);
3007 return JNI_ERR;
3008 }
3009 *wrt++ = *rd++; // copy to option string
3010 }
3011 rd++; // don't copy close quote
3012 } else {
3013 *wrt++ = *rd++; // copy to option string
3014 }
3015 }
3016 // Need to check if we're done before writing a NULL,
3017 // because the write could be to the byte that rd is pointing to.
3018 if (*rd++ == 0) {
3019 *wrt = 0;
3020 break;
3021 }
3022 *wrt = 0; // Zero terminate option
3023 }
3024 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3025 JavaVMInitArgs vm_args;
3026 vm_args.version = JNI_VERSION_1_2;
3027 vm_args.options = options;
3028 vm_args.nOptions = i;
3029 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3030
3031 if (PrintVMOptions) {
3032 const char* tail;
3033 for (int i = 0; i < vm_args.nOptions; i++) {
3034 const JavaVMOption *option = vm_args.options + i;
3035 if (match_option(option, "-XX:", &tail)) {
3036 logOption(tail);
3037 }
3038 }
3039 }
3040
3041 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
3042 }
3043 return JNI_OK;
3044 }
3045
3046 void Arguments::set_shared_spaces_flags() {
3047 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
3048 const bool might_share = must_share || UseSharedSpaces;
3049
3050 // CompressedOops cannot be used with CDS. The offsets of oopmaps and
3051 // static fields are incorrect in the archive. With some more clever
3052 // initialization, this restriction can probably be lifted.
3053 // ??? UseLargePages might be okay now
3054 const bool cannot_share = UseCompressedOops ||
3055 (UseLargePages && FLAG_IS_CMDLINE(UseLargePages));
3056 if (cannot_share) {
3057 if (must_share) {
3058 warning("disabling large pages %s"
3059 "because of %s", "" LP64_ONLY("and compressed oops "),
3060 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
3061 FLAG_SET_CMDLINE(bool, UseLargePages, false);
3062 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
3063 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false));
3064 } else {
3065 // Prefer compressed oops and large pages to class data sharing
3066 if (UseSharedSpaces && Verbose) {
3067 warning("turning off use of shared archive because of large pages%s",
3068 "" LP64_ONLY(" and/or compressed oops"));
3069 }
3070 no_shared_spaces();
3071 }
3072 } else if (UseLargePages && might_share) {
3073 // Disable large pages to allow shared spaces. This is sub-optimal, since
3074 // there may not even be a shared archive to use.
3075 FLAG_SET_DEFAULT(UseLargePages, false);
3076 }
3077
3078 if (DumpSharedSpaces) {
3079 if (RequireSharedSpaces) {
3080 warning("cannot dump shared archive while using shared archive");
3081 }
3082 UseSharedSpaces = false;
3083 }
3084 }
3085
3086 // Disable options not supported in this release, with a warning if they
3087 // were explicitly requested on the command-line
3088 #define UNSUPPORTED_OPTION(opt, description) \
3089 do { \
3090 if (opt) { \
3091 if (FLAG_IS_CMDLINE(opt)) { \
3092 warning(description " is disabled in this release."); \
3093 } \
3094 FLAG_SET_DEFAULT(opt, false); \
3095 } \
3096 } while(0)
3097
3098
3099 #define UNSUPPORTED_GC_OPTION(gc) \
3100 do { \
3101 if (gc) { \
3102 if (FLAG_IS_CMDLINE(gc)) { \
3103 warning(#gc " is not supported in this VM. Using Serial GC."); \
3104 } \
3105 FLAG_SET_DEFAULT(gc, false); \
3106 } \
3107 } while(0)
3108
3109 #if !INCLUDE_ALL_GCS
3110 static void force_serial_gc() {
3111 FLAG_SET_DEFAULT(UseSerialGC, true);
3112 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3113 UNSUPPORTED_GC_OPTION(UseG1GC);
3114 UNSUPPORTED_GC_OPTION(UseParallelGC);
3115 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3116 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3117 UNSUPPORTED_GC_OPTION(UseParNewGC);
3118 }
3119 #endif // INCLUDE_ALL_GCS
3120
3121 // Parse entry point called from JNI_CreateJavaVM
3122
3123 jint Arguments::parse(const JavaVMInitArgs* args) {
3124
3125 // Sharing support
3126 // Construct the path to the archive
3127 char jvm_path[JVM_MAXPATHLEN];
3128 os::jvm_path(jvm_path, sizeof(jvm_path));
3129 char *end = strrchr(jvm_path, *os::file_separator());
3130 if (end != NULL) *end = '\0';
3131 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
3132 strlen(os::file_separator()) + 20, mtInternal);
3133 if (shared_archive_path == NULL) return JNI_ENOMEM;
3134 strcpy(shared_archive_path, jvm_path);
3135 strcat(shared_archive_path, os::file_separator());
3136 strcat(shared_archive_path, "classes");
3137 strcat(shared_archive_path, ".jsa");
3138 SharedArchivePath = shared_archive_path;
3139
3140 // Remaining part of option string
3141 const char* tail;
3142
3143 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3144 const char* hotspotrc = ".hotspotrc";
3145 bool settings_file_specified = false;
3146 bool needs_hotspotrc_warning = false;
3147
3148 const char* flags_file;
3149 int index;
3150 for (index = 0; index < args->nOptions; index++) {
3151 const JavaVMOption *option = args->options + index;
3152 if (match_option(option, "-XX:Flags=", &tail)) {
3153 flags_file = tail;
3154 settings_file_specified = true;
3155 }
3156 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3157 PrintVMOptions = true;
3158 }
3159 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3160 PrintVMOptions = false;
3161 }
3162 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3163 IgnoreUnrecognizedVMOptions = true;
3164 }
3165 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3166 IgnoreUnrecognizedVMOptions = false;
3167 }
3168 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3169 CommandLineFlags::printFlags(tty, false);
3170 vm_exit(0);
3171 }
3172 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3173 #if INCLUDE_NMT
3174 MemTracker::init_tracking_options(tail);
3175 #else
3176 jio_fprintf(defaultStream::error_stream(),
3177 "Native Memory Tracking is not supported in this VM\n");
3178 return JNI_ERR;
3179 #endif
3180 }
3181
3182
3183 #ifndef PRODUCT
3184 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3185 CommandLineFlags::printFlags(tty, true);
3186 vm_exit(0);
3187 }
3188 #endif
3189 }
3190
3191 if (IgnoreUnrecognizedVMOptions) {
3192 // uncast const to modify the flag args->ignoreUnrecognized
3193 *(jboolean*)(&args->ignoreUnrecognized) = true;
3194 }
3195
3196 // Parse specified settings file
3197 if (settings_file_specified) {
3198 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3199 return JNI_EINVAL;
3200 }
3201 } else {
3202 #ifdef ASSERT
3203 // Parse default .hotspotrc settings file
3204 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3205 return JNI_EINVAL;
3206 }
3207 #else
3208 struct stat buf;
3209 if (os::stat(hotspotrc, &buf) == 0) {
3210 needs_hotspotrc_warning = true;
3211 }
3212 #endif
3213 }
3214
3215 if (PrintVMOptions) {
3216 for (index = 0; index < args->nOptions; index++) {
3217 const JavaVMOption *option = args->options + index;
3218 if (match_option(option, "-XX:", &tail)) {
3219 logOption(tail);
3220 }
3221 }
3222 }
3223
3224 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3225 jint result = parse_vm_init_args(args);
3226 if (result != JNI_OK) {
3227 return result;
3228 }
3229
3230 // Delay warning until here so that we've had a chance to process
3231 // the -XX:-PrintWarnings flag
3232 if (needs_hotspotrc_warning) {
3233 warning("%s file is present but has been ignored. "
3234 "Run with -XX:Flags=%s to load the file.",
3235 hotspotrc, hotspotrc);
3236 }
3237
3238 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3239 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3240 #endif
3241
3242 #if INCLUDE_ALL_GCS
3243 #if (defined JAVASE_EMBEDDED || defined ARM)
3244 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3245 #endif
3246 #endif
3247
3248 #ifndef PRODUCT
3249 if (TraceBytecodesAt != 0) {
3250 TraceBytecodes = true;
3251 }
3252 if (CountCompiledCalls) {
3253 if (UseCounterDecay) {
3254 warning("UseCounterDecay disabled because CountCalls is set");
3255 UseCounterDecay = false;
3256 }
3257 }
3258 #endif // PRODUCT
3259
3260 // JSR 292 is not supported before 1.7
3261 if (!JDK_Version::is_gte_jdk17x_version()) {
3262 if (EnableInvokeDynamic) {
3263 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3264 warning("JSR 292 is not supported before 1.7. Disabling support.");
3265 }
3266 EnableInvokeDynamic = false;
3267 }
3268 }
3269
3270 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3271 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3272 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3273 }
3274 ScavengeRootsInCode = 1;
3275 }
3276
3277 if (PrintGCDetails) {
3278 // Turn on -verbose:gc options as well
3279 PrintGC = true;
3280 }
3281
3282 if (!JDK_Version::is_gte_jdk18x_version()) {
3283 // To avoid changing the log format for 7 updates this flag is only
3284 // true by default in JDK8 and above.
3285 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3286 FLAG_SET_DEFAULT(PrintGCCause, false);
3287 }
3288 }
3289
3290 // Set object alignment values.
3291 set_object_alignment();
3292
3293 #if !INCLUDE_ALL_GCS
3294 force_serial_gc();
3295 #endif // INCLUDE_ALL_GCS
3296 #if !INCLUDE_CDS
3297 if (DumpSharedSpaces || RequireSharedSpaces) {
3298 jio_fprintf(defaultStream::error_stream(),
3299 "Shared spaces are not supported in this VM\n");
3300 return JNI_ERR;
3301 }
3302 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3303 warning("Shared spaces are not supported in this VM");
3304 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3305 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3306 }
3307 no_shared_spaces();
3308 #endif // INCLUDE_CDS
3309
3310 // Set flags based on ergonomics.
3311 set_ergonomics_flags();
3312
3313 set_shared_spaces_flags();
3314
3315 // Check the GC selections again.
3316 if (!check_gc_consistency()) {
3317 return JNI_EINVAL;
3318 }
3319
3320 if (TieredCompilation) {
3321 set_tiered_flags();
3322 } else {
3323 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3324 if (CompilationPolicyChoice >= 2) {
3325 vm_exit_during_initialization(
3326 "Incompatible compilation policy selected", NULL);
3327 }
3328 }
3329
3330 // Set heap size based on available physical memory
3331 set_heap_size();
3332
3333 #if INCLUDE_ALL_GCS
3334 // Set per-collector flags
3335 if (UseParallelGC || UseParallelOldGC) {
3336 set_parallel_gc_flags();
3337 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3338 set_cms_and_parnew_gc_flags();
3339 } else if (UseParNewGC) { // skipped if CMS is set above
3340 set_parnew_gc_flags();
3341 } else if (UseG1GC) {
3342 set_g1_gc_flags();
3343 }
3344 check_deprecated_gcs();
3345 check_deprecated_gc_flags();
3346 if (AssumeMP && !UseSerialGC) {
3347 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3348 warning("If the number of processors is expected to increase from one, then"
3349 " you should configure the number of parallel GC threads appropriately"
3350 " using -XX:ParallelGCThreads=N");
3351 }
3352 }
3353 #else // INCLUDE_ALL_GCS
3354 assert(verify_serial_gc_flags(), "SerialGC unset");
3355 #endif // INCLUDE_ALL_GCS
3356
3357 // Set bytecode rewriting flags
3358 set_bytecode_flags();
3359
3360 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3361 set_aggressive_opts_flags();
3362
3363 // Turn off biased locking for locking debug mode flags,
3364 // which are subtlely different from each other but neither works with
3365 // biased locking.
3366 if (UseHeavyMonitors
3367 #ifdef COMPILER1
3368 || !UseFastLocking
3369 #endif // COMPILER1
3370 ) {
3371 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3372 // flag set to true on command line; warn the user that they
3373 // can't enable biased locking here
3374 warning("Biased Locking is not supported with locking debug flags"
3375 "; ignoring UseBiasedLocking flag." );
3376 }
3377 UseBiasedLocking = false;
3378 }
3379
3380 #ifdef CC_INTERP
3381 // Clear flags not supported by the C++ interpreter
3382 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3383 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3384 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3385 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
3386 #endif // CC_INTERP
3387
3388 #ifdef COMPILER2
3389 if (!UseBiasedLocking || EmitSync != 0) {
3390 UseOptoBiasInlining = false;
3391 }
3392 if (!EliminateLocks) {
3393 EliminateNestedLocks = false;
3394 }
3395 if (!Inline) {
3396 IncrementalInline = false;
3397 }
3398 #ifndef PRODUCT
3399 if (!IncrementalInline) {
3400 AlwaysIncrementalInline = false;
3401 }
3402 #endif
3403 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3404 // incremental inlining: bump MaxNodeLimit
3405 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3406 }
3407 #endif
3408
3409 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3410 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3411 DebugNonSafepoints = true;
3412 }
3413
3414 #ifndef PRODUCT
3415 if (CompileTheWorld) {
3416 // Force NmethodSweeper to sweep whole CodeCache each time.
3417 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3418 NmethodSweepFraction = 1;
3419 }
3420 }
3421 #endif
3422
3423 if (PrintCommandLineFlags) {
3424 CommandLineFlags::printSetFlags(tty);
3425 }
3426
3427 // Apply CPU specific policy for the BiasedLocking
3428 if (UseBiasedLocking) {
3429 if (!VM_Version::use_biased_locking() &&
3430 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3431 UseBiasedLocking = false;
3432 }
3433 }
3434
3435 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3436 // but only if not already set on the commandline
3437 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3438 bool set = false;
3439 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3440 if (!set) {
3441 FLAG_SET_DEFAULT(PauseAtExit, true);
3442 }
3443 }
3444
3445 return JNI_OK;
3446 }
3447
3448 jint Arguments::adjust_after_os() {
3449 #if INCLUDE_ALL_GCS
3450 if (UseParallelGC || UseParallelOldGC) {
3451 if (UseNUMA) {
3452 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3453 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3454 }
3455 // For those collectors or operating systems (eg, Windows) that do
3456 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3457 UseNUMAInterleaving = true;
3458 }
3459 }
3460 #endif // INCLUDE_ALL_GCS
3461 return JNI_OK;
3462 }
3463
3464 int Arguments::PropertyList_count(SystemProperty* pl) {
3465 int count = 0;
3466 while(pl != NULL) {
3467 count++;
3468 pl = pl->next();
3469 }
3470 return count;
3471 }
3472
3473 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3474 assert(key != NULL, "just checking");
3475 SystemProperty* prop;
3476 for (prop = pl; prop != NULL; prop = prop->next()) {
3477 if (strcmp(key, prop->key()) == 0) return prop->value();
3478 }
3479 return NULL;
3480 }
3481
3482 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3483 int count = 0;
3484 const char* ret_val = NULL;
3485
3486 while(pl != NULL) {
3487 if(count >= index) {
3488 ret_val = pl->key();
3489 break;
3490 }
3491 count++;
3492 pl = pl->next();
3493 }
3494
3495 return ret_val;
3496 }
3497
3498 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3499 int count = 0;
3500 char* ret_val = NULL;
3501
3502 while(pl != NULL) {
3503 if(count >= index) {
3504 ret_val = pl->value();
3505 break;
3506 }
3507 count++;
3508 pl = pl->next();
3509 }
3510
3511 return ret_val;
3512 }
3513
3514 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3515 SystemProperty* p = *plist;
3516 if (p == NULL) {
3517 *plist = new_p;
3518 } else {
3519 while (p->next() != NULL) {
3520 p = p->next();
3521 }
3522 p->set_next(new_p);
3523 }
3524 }
3525
3526 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3527 if (plist == NULL)
3528 return;
3529
3530 SystemProperty* new_p = new SystemProperty(k, v, true);
3531 PropertyList_add(plist, new_p);
3532 }
3533
3534 // This add maintains unique property key in the list.
3535 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3536 if (plist == NULL)
3537 return;
3538
3539 // If property key exist then update with new value.
3540 SystemProperty* prop;
3541 for (prop = *plist; prop != NULL; prop = prop->next()) {
3542 if (strcmp(k, prop->key()) == 0) {
3543 if (append) {
3544 prop->append_value(v);
3545 } else {
3546 prop->set_value(v);
3547 }
3548 return;
3549 }
3550 }
3551
3552 PropertyList_add(plist, k, v);
3553 }
3554
3555 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3556 // Returns true if all of the source pointed by src has been copied over to
3557 // the destination buffer pointed by buf. Otherwise, returns false.
3558 // Notes:
3559 // 1. If the length (buflen) of the destination buffer excluding the
3560 // NULL terminator character is not long enough for holding the expanded
3561 // pid characters, it also returns false instead of returning the partially
3562 // expanded one.
3563 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3564 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3565 char* buf, size_t buflen) {
3566 const char* p = src;
3567 char* b = buf;
3568 const char* src_end = &src[srclen];
3569 char* buf_end = &buf[buflen - 1];
3570
3571 while (p < src_end && b < buf_end) {
3572 if (*p == '%') {
3573 switch (*(++p)) {
3574 case '%': // "%%" ==> "%"
3575 *b++ = *p++;
3576 break;
3577 case 'p': { // "%p" ==> current process id
3578 // buf_end points to the character before the last character so
3579 // that we could write '\0' to the end of the buffer.
3580 size_t buf_sz = buf_end - b + 1;
3581 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3582
3583 // if jio_snprintf fails or the buffer is not long enough to hold
3584 // the expanded pid, returns false.
3585 if (ret < 0 || ret >= (int)buf_sz) {
3586 return false;
3587 } else {
3588 b += ret;
3589 assert(*b == '\0', "fail in copy_expand_pid");
3590 if (p == src_end && b == buf_end + 1) {
3591 // reach the end of the buffer.
3592 return true;
3593 }
3594 }
3595 p++;
3596 break;
3597 }
3598 default :
3599 *b++ = '%';
3600 }
3601 } else {
3602 *b++ = *p++;
3603 }
3604 }
3605 *b = '\0';
3606 return (p == src_end); // return false if not all of the source was copied
3607 }