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 initial_heap_size has not been set with InitialHeapSize
1621 // or -Xms, then set it as fraction of the size of physical memory,
1622 // respecting the maximum and minimum sizes of the heap.
1623 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1624 julong reasonable_minimum = (julong)(OldSize + NewSize);
1625
1626 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1627
1628 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1629
1630 julong reasonable_initial = phys_mem / InitialRAMFraction;
1631
1632 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
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 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1641 }
1642 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1643 set_min_heap_size((uintx)reasonable_minimum);
1644 }
1645 }
1646
1647 // This must be called after ergonomics because we want bytecode rewriting
1648 // if the server compiler is used, or if UseSharedSpaces is disabled.
1649 void Arguments::set_bytecode_flags() {
1650 // Better not attempt to store into a read-only space.
1651 if (UseSharedSpaces) {
1652 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1653 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1654 }
1655
1656 if (!RewriteBytecodes) {
1657 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1658 }
1659 }
1660
1661 // Aggressive optimization flags -XX:+AggressiveOpts
1662 void Arguments::set_aggressive_opts_flags() {
1663 #ifdef COMPILER2
1664 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1665 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1666 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1667 }
1668 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1669 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1670 }
1671
1672 // Feed the cache size setting into the JDK
1673 char buffer[1024];
1674 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1675 add_property(buffer);
1676 }
1677 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1678 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1679 }
1680 #endif
1681
1682 if (AggressiveOpts) {
1683 // Sample flag setting code
1684 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1685 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1686 // }
1687 }
1688 }
1689
1690 void Arguments::process_stackguardpages_option(const char* tail) {
1691 int page_size = os::vm_page_size();
1692 #define convert_page_size_units(_value, _unit1, _unit2) (round_to(align_size_up((_value) * (_unit1), (page_size)), (_unit2)) / (_unit2))
1693
1694 if (tail == NULL) {
1695 FLAG_SET_DEFAULT(StackYellowPages, convert_page_size_units(StackYellowSize, 1, page_size));
1696 FLAG_SET_DEFAULT(StackRedPages, convert_page_size_units(StackRedSize, 1, page_size));
1697 FLAG_SET_DEFAULT(StackShadowPages, convert_page_size_units(StackShadowSize, 1, page_size));
1698 } else {
1699 if (!strncmp(tail, "StackYellowSize=", strlen("StackYellowSize="))) {
1700 FLAG_SET_DEFAULT(StackYellowPages, convert_page_size_units(StackYellowSize, 1, page_size));
1701 } else if (!strncmp(tail, "StackRedSize=", strlen("StackRedSize="))) {
1702 FLAG_SET_DEFAULT(StackRedPages, convert_page_size_units(StackRedSize, 1, page_size));
1703 } else if (!strncmp(tail, "StackShadowSize=", strlen("StackShadowSize="))) {
1704 FLAG_SET_DEFAULT(StackShadowPages, convert_page_size_units(StackShadowSize, 1, page_size));
1705 } else
1706 if (!strncmp(tail, "StackYellowPages=", strlen("StackYellowPages="))) {
1707 FLAG_SET_DEFAULT(StackYellowSize, convert_page_size_units(StackYellowPages, page_size, 1));
1708 } else if (!strncmp(tail, "StackRedPages=", strlen("StackRedPages="))) {
1709 FLAG_SET_DEFAULT(StackRedSize, convert_page_size_units(StackRedPages, page_size, 1));
1710 } else if (!strncmp(tail, "StackShadowPages=", strlen("StackShadowPages="))) {
1711 FLAG_SET_DEFAULT(StackShadowSize, convert_page_size_units(StackShadowPages, page_size, 1));
1712 }
1713 }
1714
1715 if (StackRedSize <= 0) FLAG_SET_DEFAULT(StackRedSize, page_size);
1716 if (StackYellowSize <= 0) FLAG_SET_DEFAULT(StackYellowSize, page_size);
1717 if (StackShadowSize <= 0) FLAG_SET_DEFAULT(StackShadowSize, page_size);
1718
1719 // Make sure parameter pairs reflect identical size.
1720 if (StackRedPages <= 0) FLAG_SET_DEFAULT(StackRedPages, convert_page_size_units(StackRedSize, 1, page_size));
1721 if (StackYellowPages <= 0) FLAG_SET_DEFAULT(StackYellowPages, convert_page_size_units(StackYellowSize, 1, page_size));
1722 if (StackShadowPages <= 0) FLAG_SET_DEFAULT(StackShadowPages, convert_page_size_units(StackShadowSize, 1, page_size));
1723
1724 #undef convert_page_size_units
1725 }
1726
1727 //===========================================================================================================
1728 // Parsing of java.compiler property
1729
1730 void Arguments::process_java_compiler_argument(char* arg) {
1731 // For backwards compatibility, Djava.compiler=NONE or ""
1732 // causes us to switch to -Xint mode UNLESS -Xdebug
1733 // is also specified.
1734 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1735 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1736 }
1737 }
1738
1739 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1740 _sun_java_launcher = strdup(launcher);
1741 if (strcmp("gamma", _sun_java_launcher) == 0) {
1742 _created_by_gamma_launcher = true;
1743 }
1744 }
1745
1746 bool Arguments::created_by_java_launcher() {
1747 assert(_sun_java_launcher != NULL, "property must have value");
1748 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1749 }
1750
1751 bool Arguments::created_by_gamma_launcher() {
1752 return _created_by_gamma_launcher;
1753 }
1754
1755 //===========================================================================================================
1756 // Parsing of main arguments
1757
1758 bool Arguments::verify_interval(uintx val, uintx min,
1759 uintx max, const char* name) {
1760 // Returns true iff value is in the inclusive interval [min..max]
1761 // false, otherwise.
1762 if (val >= min && val <= max) {
1763 return true;
1764 }
1765 jio_fprintf(defaultStream::error_stream(),
1766 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1767 " and " UINTX_FORMAT "\n",
1768 name, val, min, max);
1769 return false;
1770 }
1771
1772 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1773 // Returns true if given value is at least specified min threshold
1774 // false, otherwise.
1775 if (val >= min ) {
1776 return true;
1777 }
1778 jio_fprintf(defaultStream::error_stream(),
1779 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1780 name, val, min);
1781 return false;
1782 }
1783
1784 bool Arguments::verify_percentage(uintx value, const char* name) {
1785 if (value <= 100) {
1786 return true;
1787 }
1788 jio_fprintf(defaultStream::error_stream(),
1789 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1790 name, value);
1791 return false;
1792 }
1793
1794 #if !INCLUDE_ALL_GCS
1795 #ifdef ASSERT
1796 static bool verify_serial_gc_flags() {
1797 return (UseSerialGC &&
1798 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1799 UseParallelGC || UseParallelOldGC));
1800 }
1801 #endif // ASSERT
1802 #endif // INCLUDE_ALL_GCS
1803
1804 // check if do gclog rotation
1805 // +UseGCLogFileRotation is a must,
1806 // no gc log rotation when log file not supplied or
1807 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1808 void check_gclog_consistency() {
1809 if (UseGCLogFileRotation) {
1810 if ((Arguments::gc_log_filename() == NULL) ||
1811 (NumberOfGCLogFiles == 0) ||
1812 (GCLogFileSize == 0)) {
1813 jio_fprintf(defaultStream::output_stream(),
1814 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1815 "where num_of_file > 0 and num_of_size > 0\n"
1816 "GC log rotation is turned off\n");
1817 UseGCLogFileRotation = false;
1818 }
1819 }
1820
1821 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1822 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1823 jio_fprintf(defaultStream::output_stream(),
1824 "GCLogFileSize changed to minimum 8K\n");
1825 }
1826 }
1827
1828 // Check consistency of GC selection
1829 bool Arguments::check_gc_consistency() {
1830 check_gclog_consistency();
1831 bool status = true;
1832 // Ensure that the user has not selected conflicting sets
1833 // of collectors. [Note: this check is merely a user convenience;
1834 // collectors over-ride each other so that only a non-conflicting
1835 // set is selected; however what the user gets is not what they
1836 // may have expected from the combination they asked for. It's
1837 // better to reduce user confusion by not allowing them to
1838 // select conflicting combinations.
1839 uint i = 0;
1840 if (UseSerialGC) i++;
1841 if (UseConcMarkSweepGC || UseParNewGC) i++;
1842 if (UseParallelGC || UseParallelOldGC) i++;
1843 if (UseG1GC) i++;
1844 if (i > 1) {
1845 jio_fprintf(defaultStream::error_stream(),
1846 "Conflicting collector combinations in option list; "
1847 "please refer to the release notes for the combinations "
1848 "allowed\n");
1849 status = false;
1850 }
1851
1852 return status;
1853 }
1854
1855 void Arguments::check_deprecated_gcs() {
1856 if (UseConcMarkSweepGC && !UseParNewGC) {
1857 warning("Using the DefNew young collector with the CMS collector is deprecated "
1858 "and will likely be removed in a future release");
1859 }
1860
1861 if (UseParNewGC && !UseConcMarkSweepGC) {
1862 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1863 // set up UseSerialGC properly, so that can't be used in the check here.
1864 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1865 "and will likely be removed in a future release");
1866 }
1867
1868 if (CMSIncrementalMode) {
1869 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1870 }
1871 }
1872
1873 void Arguments::check_deprecated_gc_flags() {
1874 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
1875 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
1876 "and will likely be removed in future release");
1877 }
1878 }
1879
1880 // Check stack pages settings
1881 bool Arguments::check_stack_pages()
1882 {
1883 bool status = true;
1884 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1885 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1886 // greater stack shadow pages can't generate instruction to bang stack
1887 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1888 return status;
1889 }
1890
1891 // Check the consistency of vm_init_args
1892 bool Arguments::check_vm_args_consistency() {
1893 // Method for adding checks for flag consistency.
1894 // The intent is to warn the user of all possible conflicts,
1895 // before returning an error.
1896 // Note: Needs platform-dependent factoring.
1897 bool status = true;
1898
1899 #if ( (defined(COMPILER2) && defined(SPARC)))
1900 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1901 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1902 // x86. Normally, VM_Version_init must be called from init_globals in
1903 // init.cpp, which is called by the initial java thread *after* arguments
1904 // have been parsed. VM_Version_init gets called twice on sparc.
1905 extern void VM_Version_init();
1906 VM_Version_init();
1907 if (!VM_Version::has_v9()) {
1908 jio_fprintf(defaultStream::error_stream(),
1909 "V8 Machine detected, Server requires V9\n");
1910 status = false;
1911 }
1912 #endif /* COMPILER2 && SPARC */
1913
1914 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1915 // builds so the cost of stack banging can be measured.
1916 #if (defined(PRODUCT) && defined(SOLARIS))
1917 if (!UseBoundThreads && !UseStackBanging) {
1918 jio_fprintf(defaultStream::error_stream(),
1919 "-UseStackBanging conflicts with -UseBoundThreads\n");
1920
1921 status = false;
1922 }
1923 #endif
1924
1925 if (TLABRefillWasteFraction == 0) {
1926 jio_fprintf(defaultStream::error_stream(),
1927 "TLABRefillWasteFraction should be a denominator, "
1928 "not " SIZE_FORMAT "\n",
1929 TLABRefillWasteFraction);
1930 status = false;
1931 }
1932
1933 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1934 "AdaptiveSizePolicyWeight");
1935 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1936 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1937 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1938
1939 // Divide by bucket size to prevent a large size from causing rollover when
1940 // calculating amount of memory needed to be allocated for the String table.
1941 status = status && verify_interval(StringTableSize, minimumStringTableSize,
1942 (max_uintx / StringTable::bucket_size()), "StringTable size");
1943
1944 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1945 jio_fprintf(defaultStream::error_stream(),
1946 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1947 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1948 MinHeapFreeRatio, MaxHeapFreeRatio);
1949 status = false;
1950 }
1951 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1952 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1953
1954 // Min/MaxMetaspaceFreeRatio
1955 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
1956 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
1957
1958 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
1959 jio_fprintf(defaultStream::error_stream(),
1960 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
1961 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
1962 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
1963 MinMetaspaceFreeRatio,
1964 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
1965 MaxMetaspaceFreeRatio);
1966 status = false;
1967 }
1968
1969 // Trying to keep 100% free is not practical
1970 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
1971
1972 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1973 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1974 }
1975
1976 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1977 // Settings to encourage splitting.
1978 if (!FLAG_IS_CMDLINE(NewRatio)) {
1979 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
1980 }
1981 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1982 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1983 }
1984 }
1985
1986 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1987 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1988 if (GCTimeLimit == 100) {
1989 // Turn off gc-overhead-limit-exceeded checks
1990 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1991 }
1992
1993 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1994
1995 status = status && check_gc_consistency();
1996 status = status && check_stack_pages();
1997
1998 if (_has_alloc_profile) {
1999 if (UseParallelGC || UseParallelOldGC) {
2000 jio_fprintf(defaultStream::error_stream(),
2001 "error: invalid argument combination.\n"
2002 "Allocation profiling (-Xaprof) cannot be used together with "
2003 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
2004 status = false;
2005 }
2006 if (UseConcMarkSweepGC) {
2007 jio_fprintf(defaultStream::error_stream(),
2008 "error: invalid argument combination.\n"
2009 "Allocation profiling (-Xaprof) cannot be used together with "
2010 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
2011 status = false;
2012 }
2013 }
2014
2015 if (CMSIncrementalMode) {
2016 if (!UseConcMarkSweepGC) {
2017 jio_fprintf(defaultStream::error_stream(),
2018 "error: invalid argument combination.\n"
2019 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2020 "selected in order\nto use CMSIncrementalMode.\n");
2021 status = false;
2022 } else {
2023 status = status && verify_percentage(CMSIncrementalDutyCycle,
2024 "CMSIncrementalDutyCycle");
2025 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2026 "CMSIncrementalDutyCycleMin");
2027 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2028 "CMSIncrementalSafetyFactor");
2029 status = status && verify_percentage(CMSIncrementalOffset,
2030 "CMSIncrementalOffset");
2031 status = status && verify_percentage(CMSExpAvgFactor,
2032 "CMSExpAvgFactor");
2033 // If it was not set on the command line, set
2034 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2035 if (CMSInitiatingOccupancyFraction < 0) {
2036 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2037 }
2038 }
2039 }
2040
2041 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2042 // insists that we hold the requisite locks so that the iteration is
2043 // MT-safe. For the verification at start-up and shut-down, we don't
2044 // yet have a good way of acquiring and releasing these locks,
2045 // which are not visible at the CollectedHeap level. We want to
2046 // be able to acquire these locks and then do the iteration rather
2047 // than just disable the lock verification. This will be fixed under
2048 // bug 4788986.
2049 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2050 if (VerifyDuringStartup) {
2051 warning("Heap verification at start-up disabled "
2052 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2053 VerifyDuringStartup = false; // Disable verification at start-up
2054 }
2055
2056 if (VerifyBeforeExit) {
2057 warning("Heap verification at shutdown disabled "
2058 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2059 VerifyBeforeExit = false; // Disable verification at shutdown
2060 }
2061 }
2062
2063 // Note: only executed in non-PRODUCT mode
2064 if (!UseAsyncConcMarkSweepGC &&
2065 (ExplicitGCInvokesConcurrent ||
2066 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2067 jio_fprintf(defaultStream::error_stream(),
2068 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2069 " with -UseAsyncConcMarkSweepGC");
2070 status = false;
2071 }
2072
2073 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2074
2075 #if INCLUDE_ALL_GCS
2076 if (UseG1GC) {
2077 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2078 "InitiatingHeapOccupancyPercent");
2079 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2080 "G1RefProcDrainInterval");
2081 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2082 "G1ConcMarkStepDurationMillis");
2083 }
2084 #endif // INCLUDE_ALL_GCS
2085
2086 status = status && verify_interval(RefDiscoveryPolicy,
2087 ReferenceProcessor::DiscoveryPolicyMin,
2088 ReferenceProcessor::DiscoveryPolicyMax,
2089 "RefDiscoveryPolicy");
2090
2091 // Limit the lower bound of this flag to 1 as it is used in a division
2092 // expression.
2093 status = status && verify_interval(TLABWasteTargetPercent,
2094 1, 100, "TLABWasteTargetPercent");
2095
2096 status = status && verify_object_alignment();
2097
2098 status = status && verify_min_value(ClassMetaspaceSize, 1*M,
2099 "ClassMetaspaceSize");
2100
2101 status = status && verify_interval(MarkStackSizeMax,
2102 1, (max_jint - 1), "MarkStackSizeMax");
2103
2104 #ifdef SPARC
2105 if (UseConcMarkSweepGC || UseG1GC) {
2106 // Issue a stern warning if the user has explicitly set
2107 // UseMemSetInBOT (it is known to cause issues), but allow
2108 // use for experimentation and debugging.
2109 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2110 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2111 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2112 " on sun4v; please understand that you are using at your own risk!");
2113 }
2114 }
2115 #endif // SPARC
2116
2117 if (PrintNMTStatistics) {
2118 #if INCLUDE_NMT
2119 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2120 #endif // INCLUDE_NMT
2121 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2122 PrintNMTStatistics = false;
2123 #if INCLUDE_NMT
2124 }
2125 #endif
2126 }
2127
2128 return status;
2129 }
2130
2131 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2132 const char* option_type) {
2133 if (ignore) return false;
2134
2135 const char* spacer = " ";
2136 if (option_type == NULL) {
2137 option_type = ++spacer; // Set both to the empty string.
2138 }
2139
2140 if (os::obsolete_option(option)) {
2141 jio_fprintf(defaultStream::error_stream(),
2142 "Obsolete %s%soption: %s\n", option_type, spacer,
2143 option->optionString);
2144 return false;
2145 } else {
2146 jio_fprintf(defaultStream::error_stream(),
2147 "Unrecognized %s%soption: %s\n", option_type, spacer,
2148 option->optionString);
2149 return true;
2150 }
2151 }
2152
2153 static const char* user_assertion_options[] = {
2154 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2155 };
2156
2157 static const char* system_assertion_options[] = {
2158 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2159 };
2160
2161 // Return true if any of the strings in null-terminated array 'names' matches.
2162 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2163 // the option must match exactly.
2164 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2165 bool tail_allowed) {
2166 for (/* empty */; *names != NULL; ++names) {
2167 if (match_option(option, *names, tail)) {
2168 if (**tail == '\0' || tail_allowed && **tail == ':') {
2169 return true;
2170 }
2171 }
2172 }
2173 return false;
2174 }
2175
2176 bool Arguments::parse_uintx(const char* value,
2177 uintx* uintx_arg,
2178 uintx min_size) {
2179
2180 // Check the sign first since atomull() parses only unsigned values.
2181 bool value_is_positive = !(*value == '-');
2182
2183 if (value_is_positive) {
2184 julong n;
2185 bool good_return = atomull(value, &n);
2186 if (good_return) {
2187 bool above_minimum = n >= min_size;
2188 bool value_is_too_large = n > max_uintx;
2189
2190 if (above_minimum && !value_is_too_large) {
2191 *uintx_arg = n;
2192 return true;
2193 }
2194 }
2195 }
2196 return false;
2197 }
2198
2199 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2200 julong* long_arg,
2201 julong min_size) {
2202 if (!atomull(s, long_arg)) return arg_unreadable;
2203 return check_memory_size(*long_arg, min_size);
2204 }
2205
2206 // Parse JavaVMInitArgs structure
2207
2208 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2209 // For components of the system classpath.
2210 SysClassPath scp(Arguments::get_sysclasspath());
2211 bool scp_assembly_required = false;
2212
2213 // Save default settings for some mode flags
2214 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2215 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2216 Arguments::_ClipInlining = ClipInlining;
2217 Arguments::_BackgroundCompilation = BackgroundCompilation;
2218
2219 // Setup flags for mixed which is the default
2220 set_mode_flags(_mixed);
2221
2222 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2223 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2224 if (result != JNI_OK) {
2225 return result;
2226 }
2227
2228 // Parse JavaVMInitArgs structure passed in
2229 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2230 if (result != JNI_OK) {
2231 return result;
2232 }
2233
2234 if (AggressiveOpts) {
2235 // Insert alt-rt.jar between user-specified bootclasspath
2236 // prefix and the default bootclasspath. os::set_boot_path()
2237 // uses meta_index_dir as the default bootclasspath directory.
2238 const char* altclasses_jar = "alt-rt.jar";
2239 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2240 strlen(altclasses_jar);
2241 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2242 strcpy(altclasses_path, get_meta_index_dir());
2243 strcat(altclasses_path, altclasses_jar);
2244 scp.add_suffix_to_prefix(altclasses_path);
2245 scp_assembly_required = true;
2246 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2247 }
2248
2249 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2250 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2251 if (result != JNI_OK) {
2252 return result;
2253 }
2254
2255 // Do final processing now that all arguments have been parsed
2256 result = finalize_vm_init_args(&scp, scp_assembly_required);
2257 if (result != JNI_OK) {
2258 return result;
2259 }
2260
2261 return JNI_OK;
2262 }
2263
2264 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2265 SysClassPath* scp_p,
2266 bool* scp_assembly_required_p,
2267 FlagValueOrigin origin) {
2268 // Remaining part of option string
2269 const char* tail;
2270
2271 // iterate over arguments
2272 for (int index = 0; index < args->nOptions; index++) {
2273 bool is_absolute_path = false; // for -agentpath vs -agentlib
2274
2275 const JavaVMOption* option = args->options + index;
2276
2277 if (!match_option(option, "-Djava.class.path", &tail) &&
2278 !match_option(option, "-Dsun.java.command", &tail) &&
2279 !match_option(option, "-Dsun.java.launcher", &tail)) {
2280
2281 // add all jvm options to the jvm_args string. This string
2282 // is used later to set the java.vm.args PerfData string constant.
2283 // the -Djava.class.path and the -Dsun.java.command options are
2284 // omitted from jvm_args string as each have their own PerfData
2285 // string constant object.
2286 build_jvm_args(option->optionString);
2287 }
2288
2289 // -verbose:[class/gc/jni]
2290 if (match_option(option, "-verbose", &tail)) {
2291 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2292 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2293 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2294 } else if (!strcmp(tail, ":gc")) {
2295 FLAG_SET_CMDLINE(bool, PrintGC, true);
2296 } else if (!strcmp(tail, ":jni")) {
2297 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2298 }
2299 // -da / -ea / -disableassertions / -enableassertions
2300 // These accept an optional class/package name separated by a colon, e.g.,
2301 // -da:java.lang.Thread.
2302 } else if (match_option(option, user_assertion_options, &tail, true)) {
2303 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2304 if (*tail == '\0') {
2305 JavaAssertions::setUserClassDefault(enable);
2306 } else {
2307 assert(*tail == ':', "bogus match by match_option()");
2308 JavaAssertions::addOption(tail + 1, enable);
2309 }
2310 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2311 } else if (match_option(option, system_assertion_options, &tail, false)) {
2312 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2313 JavaAssertions::setSystemClassDefault(enable);
2314 // -bootclasspath:
2315 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2316 scp_p->reset_path(tail);
2317 *scp_assembly_required_p = true;
2318 // -bootclasspath/a:
2319 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2320 scp_p->add_suffix(tail);
2321 *scp_assembly_required_p = true;
2322 // -bootclasspath/p:
2323 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2324 scp_p->add_prefix(tail);
2325 *scp_assembly_required_p = true;
2326 // -Xrun
2327 } else if (match_option(option, "-Xrun", &tail)) {
2328 if (tail != NULL) {
2329 const char* pos = strchr(tail, ':');
2330 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2331 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2332 name[len] = '\0';
2333
2334 char *options = NULL;
2335 if(pos != NULL) {
2336 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2337 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2338 }
2339 #if !INCLUDE_JVMTI
2340 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2341 jio_fprintf(defaultStream::error_stream(),
2342 "Profiling and debugging agents are not supported in this VM\n");
2343 return JNI_ERR;
2344 }
2345 #endif // !INCLUDE_JVMTI
2346 add_init_library(name, options);
2347 }
2348 // -agentlib and -agentpath
2349 } else if (match_option(option, "-agentlib:", &tail) ||
2350 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2351 if(tail != NULL) {
2352 const char* pos = strchr(tail, '=');
2353 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2354 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2355 name[len] = '\0';
2356
2357 char *options = NULL;
2358 if(pos != NULL) {
2359 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2360 }
2361 #if !INCLUDE_JVMTI
2362 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2363 jio_fprintf(defaultStream::error_stream(),
2364 "Profiling and debugging agents are not supported in this VM\n");
2365 return JNI_ERR;
2366 }
2367 #endif // !INCLUDE_JVMTI
2368 add_init_agent(name, options, is_absolute_path);
2369 }
2370 // -javaagent
2371 } else if (match_option(option, "-javaagent:", &tail)) {
2372 #if !INCLUDE_JVMTI
2373 jio_fprintf(defaultStream::error_stream(),
2374 "Instrumentation agents are not supported in this VM\n");
2375 return JNI_ERR;
2376 #else
2377 if(tail != NULL) {
2378 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2379 add_init_agent("instrument", options, false);
2380 }
2381 #endif // !INCLUDE_JVMTI
2382 // -Xnoclassgc
2383 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2384 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2385 // -Xincgc: i-CMS
2386 } else if (match_option(option, "-Xincgc", &tail)) {
2387 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2388 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2389 // -Xnoincgc: no i-CMS
2390 } else if (match_option(option, "-Xnoincgc", &tail)) {
2391 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2392 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2393 // -Xconcgc
2394 } else if (match_option(option, "-Xconcgc", &tail)) {
2395 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2396 // -Xnoconcgc
2397 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2398 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2399 // -Xbatch
2400 } else if (match_option(option, "-Xbatch", &tail)) {
2401 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2402 // -Xmn for compatibility with other JVM vendors
2403 } else if (match_option(option, "-Xmn", &tail)) {
2404 julong long_initial_eden_size = 0;
2405 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2406 if (errcode != arg_in_range) {
2407 jio_fprintf(defaultStream::error_stream(),
2408 "Invalid initial eden size: %s\n", option->optionString);
2409 describe_range_error(errcode);
2410 return JNI_EINVAL;
2411 }
2412 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2413 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2414 // -Xms
2415 } else if (match_option(option, "-Xms", &tail)) {
2416 julong long_initial_heap_size = 0;
2417 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2418 if (errcode != arg_in_range) {
2419 jio_fprintf(defaultStream::error_stream(),
2420 "Invalid initial heap size: %s\n", option->optionString);
2421 describe_range_error(errcode);
2422 return JNI_EINVAL;
2423 }
2424 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2425 // Currently the minimum size and the initial heap sizes are the same.
2426 set_min_heap_size(InitialHeapSize);
2427 // -Xmx
2428 } else if (match_option(option, "-Xmx", &tail)) {
2429 julong long_max_heap_size = 0;
2430 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2431 if (errcode != arg_in_range) {
2432 jio_fprintf(defaultStream::error_stream(),
2433 "Invalid maximum heap size: %s\n", option->optionString);
2434 describe_range_error(errcode);
2435 return JNI_EINVAL;
2436 }
2437 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2438 // Xmaxf
2439 } else if (match_option(option, "-Xmaxf", &tail)) {
2440 int maxf = (int)(atof(tail) * 100);
2441 if (maxf < 0 || maxf > 100) {
2442 jio_fprintf(defaultStream::error_stream(),
2443 "Bad max heap free percentage size: %s\n",
2444 option->optionString);
2445 return JNI_EINVAL;
2446 } else {
2447 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2448 }
2449 // Xminf
2450 } else if (match_option(option, "-Xminf", &tail)) {
2451 int minf = (int)(atof(tail) * 100);
2452 if (minf < 0 || minf > 100) {
2453 jio_fprintf(defaultStream::error_stream(),
2454 "Bad min heap free percentage size: %s\n",
2455 option->optionString);
2456 return JNI_EINVAL;
2457 } else {
2458 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2459 }
2460 // -Xss
2461 } else if (match_option(option, "-Xss", &tail)) {
2462 julong long_ThreadStackSize = 0;
2463 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2464 if (errcode != arg_in_range) {
2465 jio_fprintf(defaultStream::error_stream(),
2466 "Invalid thread stack size: %s\n", option->optionString);
2467 describe_range_error(errcode);
2468 return JNI_EINVAL;
2469 }
2470 // Internally track ThreadStackSize in units of 1024 bytes.
2471 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2472 round_to((int)long_ThreadStackSize, K) / K);
2473 // -Xoss
2474 } else if (match_option(option, "-Xoss", &tail)) {
2475 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2476 // -Xmaxjitcodesize
2477 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2478 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2479 julong long_ReservedCodeCacheSize = 0;
2480 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2481 (size_t)InitialCodeCacheSize);
2482 if (errcode != arg_in_range) {
2483 jio_fprintf(defaultStream::error_stream(),
2484 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2485 option->optionString, InitialCodeCacheSize/K);
2486 describe_range_error(errcode);
2487 return JNI_EINVAL;
2488 }
2489 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2490 // -green
2491 } else if (match_option(option, "-green", &tail)) {
2492 jio_fprintf(defaultStream::error_stream(),
2493 "Green threads support not available\n");
2494 return JNI_EINVAL;
2495 // -native
2496 } else if (match_option(option, "-native", &tail)) {
2497 // HotSpot always uses native threads, ignore silently for compatibility
2498 // -Xsqnopause
2499 } else if (match_option(option, "-Xsqnopause", &tail)) {
2500 // EVM option, ignore silently for compatibility
2501 // -Xrs
2502 } else if (match_option(option, "-Xrs", &tail)) {
2503 // Classic/EVM option, new functionality
2504 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2505 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2506 // change default internal VM signals used - lower case for back compat
2507 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2508 // -Xoptimize
2509 } else if (match_option(option, "-Xoptimize", &tail)) {
2510 // EVM option, ignore silently for compatibility
2511 // -Xprof
2512 } else if (match_option(option, "-Xprof", &tail)) {
2513 #if INCLUDE_FPROF
2514 _has_profile = true;
2515 #else // INCLUDE_FPROF
2516 jio_fprintf(defaultStream::error_stream(),
2517 "Flat profiling is not supported in this VM.\n");
2518 return JNI_ERR;
2519 #endif // INCLUDE_FPROF
2520 // -Xaprof
2521 } else if (match_option(option, "-Xaprof", &tail)) {
2522 _has_alloc_profile = true;
2523 // -Xconcurrentio
2524 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2525 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2526 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2527 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2528 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2529 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2530
2531 // -Xinternalversion
2532 } else if (match_option(option, "-Xinternalversion", &tail)) {
2533 jio_fprintf(defaultStream::output_stream(), "%s\n",
2534 VM_Version::internal_vm_info_string());
2535 vm_exit(0);
2536 #ifndef PRODUCT
2537 // -Xprintflags
2538 } else if (match_option(option, "-Xprintflags", &tail)) {
2539 CommandLineFlags::printFlags(tty, false);
2540 vm_exit(0);
2541 #endif
2542 // -D
2543 } else if (match_option(option, "-D", &tail)) {
2544 if (!add_property(tail)) {
2545 return JNI_ENOMEM;
2546 }
2547 // Out of the box management support
2548 if (match_option(option, "-Dcom.sun.management", &tail)) {
2549 #if INCLUDE_MANAGEMENT
2550 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2551 #else
2552 jio_fprintf(defaultStream::output_stream(),
2553 "-Dcom.sun.management is not supported in this VM.\n");
2554 return JNI_ERR;
2555 #endif
2556 }
2557 // -Xint
2558 } else if (match_option(option, "-Xint", &tail)) {
2559 set_mode_flags(_int);
2560 // -Xmixed
2561 } else if (match_option(option, "-Xmixed", &tail)) {
2562 set_mode_flags(_mixed);
2563 // -Xcomp
2564 } else if (match_option(option, "-Xcomp", &tail)) {
2565 // for testing the compiler; turn off all flags that inhibit compilation
2566 set_mode_flags(_comp);
2567 // -Xshare:dump
2568 } else if (match_option(option, "-Xshare:dump", &tail)) {
2569 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2570 set_mode_flags(_int); // Prevent compilation, which creates objects
2571 // -Xshare:on
2572 } else if (match_option(option, "-Xshare:on", &tail)) {
2573 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2574 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2575 // -Xshare:auto
2576 } else if (match_option(option, "-Xshare:auto", &tail)) {
2577 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2578 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2579 // -Xshare:off
2580 } else if (match_option(option, "-Xshare:off", &tail)) {
2581 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2582 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2583 // -Xverify
2584 } else if (match_option(option, "-Xverify", &tail)) {
2585 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2586 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2587 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2588 } else if (strcmp(tail, ":remote") == 0) {
2589 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2590 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2591 } else if (strcmp(tail, ":none") == 0) {
2592 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2593 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2594 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2595 return JNI_EINVAL;
2596 }
2597 // -Xdebug
2598 } else if (match_option(option, "-Xdebug", &tail)) {
2599 // note this flag has been used, then ignore
2600 set_xdebug_mode(true);
2601 // -Xnoagent
2602 } else if (match_option(option, "-Xnoagent", &tail)) {
2603 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2604 } else if (match_option(option, "-Xboundthreads", &tail)) {
2605 // Bind user level threads to kernel threads (Solaris only)
2606 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2607 } else if (match_option(option, "-Xloggc:", &tail)) {
2608 // Redirect GC output to the file. -Xloggc:<filename>
2609 // ostream_init_log(), when called will use this filename
2610 // to initialize a fileStream.
2611 _gc_log_filename = strdup(tail);
2612 FLAG_SET_CMDLINE(bool, PrintGC, true);
2613 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2614
2615 // JNI hooks
2616 } else if (match_option(option, "-Xcheck", &tail)) {
2617 if (!strcmp(tail, ":jni")) {
2618 #if !INCLUDE_JNI_CHECK
2619 warning("JNI CHECKING is not supported in this VM");
2620 #else
2621 CheckJNICalls = true;
2622 #endif // INCLUDE_JNI_CHECK
2623 } else if (is_bad_option(option, args->ignoreUnrecognized,
2624 "check")) {
2625 return JNI_EINVAL;
2626 }
2627 } else if (match_option(option, "vfprintf", &tail)) {
2628 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2629 } else if (match_option(option, "exit", &tail)) {
2630 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2631 } else if (match_option(option, "abort", &tail)) {
2632 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2633 // -XX:+AggressiveHeap
2634 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2635
2636 // This option inspects the machine and attempts to set various
2637 // parameters to be optimal for long-running, memory allocation
2638 // intensive jobs. It is intended for machines with large
2639 // amounts of cpu and memory.
2640
2641 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2642 // VM, but we may not be able to represent the total physical memory
2643 // available (like having 8gb of memory on a box but using a 32bit VM).
2644 // Thus, we need to make sure we're using a julong for intermediate
2645 // calculations.
2646 julong initHeapSize;
2647 julong total_memory = os::physical_memory();
2648
2649 if (total_memory < (julong)256*M) {
2650 jio_fprintf(defaultStream::error_stream(),
2651 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2652 vm_exit(1);
2653 }
2654
2655 // The heap size is half of available memory, or (at most)
2656 // all of possible memory less 160mb (leaving room for the OS
2657 // when using ISM). This is the maximum; because adaptive sizing
2658 // is turned on below, the actual space used may be smaller.
2659
2660 initHeapSize = MIN2(total_memory / (julong)2,
2661 total_memory - (julong)160*M);
2662
2663 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2664
2665 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2666 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2667 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2668 // Currently the minimum size and the initial heap sizes are the same.
2669 set_min_heap_size(initHeapSize);
2670 }
2671 if (FLAG_IS_DEFAULT(NewSize)) {
2672 // Make the young generation 3/8ths of the total heap.
2673 FLAG_SET_CMDLINE(uintx, NewSize,
2674 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2675 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2676 }
2677
2678 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2679 FLAG_SET_DEFAULT(UseLargePages, true);
2680 #endif
2681
2682 // Increase some data structure sizes for efficiency
2683 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2684 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2685 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2686
2687 // See the OldPLABSize comment below, but replace 'after promotion'
2688 // with 'after copying'. YoungPLABSize is the size of the survivor
2689 // space per-gc-thread buffers. The default is 4kw.
2690 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2691
2692 // OldPLABSize is the size of the buffers in the old gen that
2693 // UseParallelGC uses to promote live data that doesn't fit in the
2694 // survivor spaces. At any given time, there's one for each gc thread.
2695 // The default size is 1kw. These buffers are rarely used, since the
2696 // survivor spaces are usually big enough. For specjbb, however, there
2697 // are occasions when there's lots of live data in the young gen
2698 // and we end up promoting some of it. We don't have a definite
2699 // explanation for why bumping OldPLABSize helps, but the theory
2700 // is that a bigger PLAB results in retaining something like the
2701 // original allocation order after promotion, which improves mutator
2702 // locality. A minor effect may be that larger PLABs reduce the
2703 // number of PLAB allocation events during gc. The value of 8kw
2704 // was arrived at by experimenting with specjbb.
2705 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2706
2707 // Enable parallel GC and adaptive generation sizing
2708 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2709 FLAG_SET_DEFAULT(ParallelGCThreads,
2710 Abstract_VM_Version::parallel_worker_threads());
2711
2712 // Encourage steady state memory management
2713 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2714
2715 // This appears to improve mutator locality
2716 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2717
2718 // Get around early Solaris scheduling bug
2719 // (affinity vs other jobs on system)
2720 // but disallow DR and offlining (5008695).
2721 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2722
2723 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2724 // The last option must always win.
2725 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2726 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2727 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2728 // The last option must always win.
2729 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2730 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2731 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2732 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2733 jio_fprintf(defaultStream::error_stream(),
2734 "Please use CMSClassUnloadingEnabled in place of "
2735 "CMSPermGenSweepingEnabled in the future\n");
2736 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2737 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2738 jio_fprintf(defaultStream::error_stream(),
2739 "Please use -XX:+UseGCOverheadLimit in place of "
2740 "-XX:+UseGCTimeLimit in the future\n");
2741 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2742 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2743 jio_fprintf(defaultStream::error_stream(),
2744 "Please use -XX:-UseGCOverheadLimit in place of "
2745 "-XX:-UseGCTimeLimit in the future\n");
2746 // The TLE options are for compatibility with 1.3 and will be
2747 // removed without notice in a future release. These options
2748 // are not to be documented.
2749 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2750 // No longer used.
2751 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2752 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2753 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2754 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2755 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2756 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2757 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2758 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2759 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2760 // No longer used.
2761 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2762 julong long_tlab_size = 0;
2763 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2764 if (errcode != arg_in_range) {
2765 jio_fprintf(defaultStream::error_stream(),
2766 "Invalid TLAB size: %s\n", option->optionString);
2767 describe_range_error(errcode);
2768 return JNI_EINVAL;
2769 }
2770 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2771 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2772 // No longer used.
2773 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2774 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2775 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2776 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2777 SOLARIS_ONLY(
2778 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2779 warning("-XX:+UsePermISM is obsolete.");
2780 FLAG_SET_CMDLINE(bool, UseISM, true);
2781 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2782 FLAG_SET_CMDLINE(bool, UseISM, false);
2783 )
2784 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2785 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2786 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2787 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2788 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2789 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2790 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2791 #if defined(DTRACE_ENABLED)
2792 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2793 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2794 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2795 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2796 #else // defined(DTRACE_ENABLED)
2797 jio_fprintf(defaultStream::error_stream(),
2798 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2799 return JNI_EINVAL;
2800 #endif // defined(DTRACE_ENABLED)
2801 #ifdef ASSERT
2802 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2803 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2804 // disable scavenge before parallel mark-compact
2805 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2806 #endif
2807 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2808 julong cms_blocks_to_claim = (julong)atol(tail);
2809 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2810 jio_fprintf(defaultStream::error_stream(),
2811 "Please use -XX:OldPLABSize in place of "
2812 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2813 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2814 julong cms_blocks_to_claim = (julong)atol(tail);
2815 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2816 jio_fprintf(defaultStream::error_stream(),
2817 "Please use -XX:OldPLABSize in place of "
2818 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2819 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2820 julong old_plab_size = 0;
2821 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2822 if (errcode != arg_in_range) {
2823 jio_fprintf(defaultStream::error_stream(),
2824 "Invalid old PLAB size: %s\n", option->optionString);
2825 describe_range_error(errcode);
2826 return JNI_EINVAL;
2827 }
2828 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2829 jio_fprintf(defaultStream::error_stream(),
2830 "Please use -XX:OldPLABSize in place of "
2831 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2832 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2833 julong young_plab_size = 0;
2834 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2835 if (errcode != arg_in_range) {
2836 jio_fprintf(defaultStream::error_stream(),
2837 "Invalid young PLAB size: %s\n", option->optionString);
2838 describe_range_error(errcode);
2839 return JNI_EINVAL;
2840 }
2841 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2842 jio_fprintf(defaultStream::error_stream(),
2843 "Please use -XX:YoungPLABSize in place of "
2844 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2845 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2846 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2847 julong stack_size = 0;
2848 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2849 if (errcode != arg_in_range) {
2850 jio_fprintf(defaultStream::error_stream(),
2851 "Invalid mark stack size: %s\n", option->optionString);
2852 describe_range_error(errcode);
2853 return JNI_EINVAL;
2854 }
2855 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2856 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2857 julong max_stack_size = 0;
2858 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2859 if (errcode != arg_in_range) {
2860 jio_fprintf(defaultStream::error_stream(),
2861 "Invalid maximum mark stack size: %s\n",
2862 option->optionString);
2863 describe_range_error(errcode);
2864 return JNI_EINVAL;
2865 }
2866 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2867 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2868 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2869 uintx conc_threads = 0;
2870 if (!parse_uintx(tail, &conc_threads, 1)) {
2871 jio_fprintf(defaultStream::error_stream(),
2872 "Invalid concurrent threads: %s\n", option->optionString);
2873 return JNI_EINVAL;
2874 }
2875 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2876 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
2877 julong max_direct_memory_size = 0;
2878 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
2879 if (errcode != arg_in_range) {
2880 jio_fprintf(defaultStream::error_stream(),
2881 "Invalid maximum direct memory size: %s\n",
2882 option->optionString);
2883 describe_range_error(errcode);
2884 return JNI_EINVAL;
2885 }
2886 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
2887 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
2888 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
2889 // away and will cause VM initialization failures!
2890 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
2891 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
2892 } else if (match_option(option, "-XX:StackRedPages", &tail) ||
2893 match_option(option, "-XX:StackShadowPages", &tail) ||
2894 match_option(option, "-XX:StackYellowPages", &tail) ||
2895 match_option(option, "-XX:StackRedSize", &tail) ||
2896 match_option(option, "-XX:StackShadowSize", &tail) ||
2897 match_option(option, "-XX:StackYellowSize", &tail)) {
2898 if (match_option(option, "-XX:", &tail) &&
2899 process_argument(tail, args->ignoreUnrecognized, origin)) {
2900 process_stackguardpages_option(tail);
2901 } else {
2902 return JNI_EINVAL;
2903 }
2904 #if !INCLUDE_MANAGEMENT
2905 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
2906 jio_fprintf(defaultStream::error_stream(),
2907 "ManagementServer is not supported in this VM.\n");
2908 return JNI_ERR;
2909 #endif // INCLUDE_MANAGEMENT
2910 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2911 // Skip -XX:Flags= since that case has already been handled
2912 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2913 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2914 return JNI_EINVAL;
2915 }
2916 }
2917 // Unknown option
2918 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2919 return JNI_ERR;
2920 }
2921 }
2922
2923 // Change the default value for flags which have different default values
2924 // when working with older JDKs.
2925 #ifdef LINUX
2926 if (JDK_Version::current().compare_major(6) <= 0 &&
2927 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2928 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2929 }
2930 #endif // LINUX
2931 return JNI_OK;
2932 }
2933
2934 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2935 // This must be done after all -D arguments have been processed.
2936 scp_p->expand_endorsed();
2937
2938 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2939 // Assemble the bootclasspath elements into the final path.
2940 Arguments::set_sysclasspath(scp_p->combined_path());
2941 }
2942
2943 // This must be done after all arguments have been processed.
2944 // java_compiler() true means set to "NONE" or empty.
2945 if (java_compiler() && !xdebug_mode()) {
2946 // For backwards compatibility, we switch to interpreted mode if
2947 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2948 // not specified.
2949 set_mode_flags(_int);
2950 }
2951 if (CompileThreshold == 0) {
2952 set_mode_flags(_int);
2953 }
2954
2955 #ifndef COMPILER2
2956 // Don't degrade server performance for footprint
2957 if (FLAG_IS_DEFAULT(UseLargePages) &&
2958 MaxHeapSize < LargePageHeapSizeThreshold) {
2959 // No need for large granularity pages w/small heaps.
2960 // Note that large pages are enabled/disabled for both the
2961 // Java heap and the code cache.
2962 FLAG_SET_DEFAULT(UseLargePages, false);
2963 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2964 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2965 }
2966
2967 // Tiered compilation is undefined with C1.
2968 TieredCompilation = false;
2969 #else
2970 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2971 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2972 }
2973 #endif
2974
2975 // If we are running in a headless jre, force java.awt.headless property
2976 // to be true unless the property has already been set.
2977 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2978 if (os::is_headless_jre()) {
2979 const char* headless = Arguments::get_property("java.awt.headless");
2980 if (headless == NULL) {
2981 char envbuffer[128];
2982 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2983 if (!add_property("java.awt.headless=true")) {
2984 return JNI_ENOMEM;
2985 }
2986 } else {
2987 char buffer[256];
2988 strcpy(buffer, "java.awt.headless=");
2989 strcat(buffer, envbuffer);
2990 if (!add_property(buffer)) {
2991 return JNI_ENOMEM;
2992 }
2993 }
2994 }
2995 }
2996
2997 if (!check_vm_args_consistency()) {
2998 return JNI_ERR;
2999 }
3000
3001 return JNI_OK;
3002 }
3003
3004 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3005 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3006 scp_assembly_required_p);
3007 }
3008
3009 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3010 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3011 scp_assembly_required_p);
3012 }
3013
3014 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3015 const int N_MAX_OPTIONS = 64;
3016 const int OPTION_BUFFER_SIZE = 1024;
3017 char buffer[OPTION_BUFFER_SIZE];
3018
3019 // The variable will be ignored if it exceeds the length of the buffer.
3020 // Don't check this variable if user has special privileges
3021 // (e.g. unix su command).
3022 if (os::getenv(name, buffer, sizeof(buffer)) &&
3023 !os::have_special_privileges()) {
3024 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3025 jio_fprintf(defaultStream::error_stream(),
3026 "Picked up %s: %s\n", name, buffer);
3027 char* rd = buffer; // pointer to the input string (rd)
3028 int i;
3029 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3030 while (isspace(*rd)) rd++; // skip whitespace
3031 if (*rd == 0) break; // we re done when the input string is read completely
3032
3033 // The output, option string, overwrites the input string.
3034 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3035 // input string (rd).
3036 char* wrt = rd;
3037
3038 options[i++].optionString = wrt; // Fill in option
3039 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3040 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3041 int quote = *rd; // matching quote to look for
3042 rd++; // don't copy open quote
3043 while (*rd != quote) { // include everything (even spaces) up until quote
3044 if (*rd == 0) { // string termination means unmatched string
3045 jio_fprintf(defaultStream::error_stream(),
3046 "Unmatched quote in %s\n", name);
3047 return JNI_ERR;
3048 }
3049 *wrt++ = *rd++; // copy to option string
3050 }
3051 rd++; // don't copy close quote
3052 } else {
3053 *wrt++ = *rd++; // copy to option string
3054 }
3055 }
3056 // Need to check if we're done before writing a NULL,
3057 // because the write could be to the byte that rd is pointing to.
3058 if (*rd++ == 0) {
3059 *wrt = 0;
3060 break;
3061 }
3062 *wrt = 0; // Zero terminate option
3063 }
3064 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3065 JavaVMInitArgs vm_args;
3066 vm_args.version = JNI_VERSION_1_2;
3067 vm_args.options = options;
3068 vm_args.nOptions = i;
3069 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3070
3071 if (PrintVMOptions) {
3072 const char* tail;
3073 for (int i = 0; i < vm_args.nOptions; i++) {
3074 const JavaVMOption *option = vm_args.options + i;
3075 if (match_option(option, "-XX:", &tail)) {
3076 logOption(tail);
3077 }
3078 }
3079 }
3080
3081 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
3082 }
3083 return JNI_OK;
3084 }
3085
3086 void Arguments::set_shared_spaces_flags() {
3087 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
3088 const bool might_share = must_share || UseSharedSpaces;
3089
3090 // CompressedOops cannot be used with CDS. The offsets of oopmaps and
3091 // static fields are incorrect in the archive. With some more clever
3092 // initialization, this restriction can probably be lifted.
3093 // ??? UseLargePages might be okay now
3094 const bool cannot_share = UseCompressedOops ||
3095 (UseLargePages && FLAG_IS_CMDLINE(UseLargePages));
3096 if (cannot_share) {
3097 if (must_share) {
3098 warning("disabling large pages %s"
3099 "because of %s", "" LP64_ONLY("and compressed oops "),
3100 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
3101 FLAG_SET_CMDLINE(bool, UseLargePages, false);
3102 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
3103 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false));
3104 } else {
3105 // Prefer compressed oops and large pages to class data sharing
3106 if (UseSharedSpaces && Verbose) {
3107 warning("turning off use of shared archive because of large pages%s",
3108 "" LP64_ONLY(" and/or compressed oops"));
3109 }
3110 no_shared_spaces();
3111 }
3112 } else if (UseLargePages && might_share) {
3113 // Disable large pages to allow shared spaces. This is sub-optimal, since
3114 // there may not even be a shared archive to use.
3115 FLAG_SET_DEFAULT(UseLargePages, false);
3116 }
3117
3118 if (DumpSharedSpaces) {
3119 if (RequireSharedSpaces) {
3120 warning("cannot dump shared archive while using shared archive");
3121 }
3122 UseSharedSpaces = false;
3123 }
3124 }
3125
3126 // Disable options not supported in this release, with a warning if they
3127 // were explicitly requested on the command-line
3128 #define UNSUPPORTED_OPTION(opt, description) \
3129 do { \
3130 if (opt) { \
3131 if (FLAG_IS_CMDLINE(opt)) { \
3132 warning(description " is disabled in this release."); \
3133 } \
3134 FLAG_SET_DEFAULT(opt, false); \
3135 } \
3136 } while(0)
3137
3138
3139 #define UNSUPPORTED_GC_OPTION(gc) \
3140 do { \
3141 if (gc) { \
3142 if (FLAG_IS_CMDLINE(gc)) { \
3143 warning(#gc " is not supported in this VM. Using Serial GC."); \
3144 } \
3145 FLAG_SET_DEFAULT(gc, false); \
3146 } \
3147 } while(0)
3148
3149 #if !INCLUDE_ALL_GCS
3150 static void force_serial_gc() {
3151 FLAG_SET_DEFAULT(UseSerialGC, true);
3152 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3153 UNSUPPORTED_GC_OPTION(UseG1GC);
3154 UNSUPPORTED_GC_OPTION(UseParallelGC);
3155 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3156 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3157 UNSUPPORTED_GC_OPTION(UseParNewGC);
3158 }
3159 #endif // INCLUDE_ALL_GCS
3160
3161 // Parse entry point called from JNI_CreateJavaVM
3162
3163 jint Arguments::parse(const JavaVMInitArgs* args) {
3164
3165 // Derive and set default values for Stack{Red,Yellow,Shadow}Pages options.
3166 process_stackguardpages_option();
3167
3168 // Sharing support
3169 // Construct the path to the archive
3170 char jvm_path[JVM_MAXPATHLEN];
3171 os::jvm_path(jvm_path, sizeof(jvm_path));
3172 char *end = strrchr(jvm_path, *os::file_separator());
3173 if (end != NULL) *end = '\0';
3174 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
3175 strlen(os::file_separator()) + 20, mtInternal);
3176 if (shared_archive_path == NULL) return JNI_ENOMEM;
3177 strcpy(shared_archive_path, jvm_path);
3178 strcat(shared_archive_path, os::file_separator());
3179 strcat(shared_archive_path, "classes");
3180 strcat(shared_archive_path, ".jsa");
3181 SharedArchivePath = shared_archive_path;
3182
3183 // Remaining part of option string
3184 const char* tail;
3185
3186 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3187 const char* hotspotrc = ".hotspotrc";
3188 bool settings_file_specified = false;
3189 bool needs_hotspotrc_warning = false;
3190
3191 const char* flags_file;
3192 int index;
3193 for (index = 0; index < args->nOptions; index++) {
3194 const JavaVMOption *option = args->options + index;
3195 if (match_option(option, "-XX:Flags=", &tail)) {
3196 flags_file = tail;
3197 settings_file_specified = true;
3198 }
3199 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3200 PrintVMOptions = true;
3201 }
3202 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3203 PrintVMOptions = false;
3204 }
3205 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3206 IgnoreUnrecognizedVMOptions = true;
3207 }
3208 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3209 IgnoreUnrecognizedVMOptions = false;
3210 }
3211 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3212 CommandLineFlags::printFlags(tty, false);
3213 vm_exit(0);
3214 }
3215 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3216 #if INCLUDE_NMT
3217 MemTracker::init_tracking_options(tail);
3218 #else
3219 jio_fprintf(defaultStream::error_stream(),
3220 "Native Memory Tracking is not supported in this VM\n");
3221 return JNI_ERR;
3222 #endif
3223 }
3224
3225
3226 #ifndef PRODUCT
3227 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3228 CommandLineFlags::printFlags(tty, true);
3229 vm_exit(0);
3230 }
3231 #endif
3232 }
3233
3234 if (IgnoreUnrecognizedVMOptions) {
3235 // uncast const to modify the flag args->ignoreUnrecognized
3236 *(jboolean*)(&args->ignoreUnrecognized) = true;
3237 }
3238
3239 // Parse specified settings file
3240 if (settings_file_specified) {
3241 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3242 return JNI_EINVAL;
3243 }
3244 } else {
3245 #ifdef ASSERT
3246 // Parse default .hotspotrc settings file
3247 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3248 return JNI_EINVAL;
3249 }
3250 #else
3251 struct stat buf;
3252 if (os::stat(hotspotrc, &buf) == 0) {
3253 needs_hotspotrc_warning = true;
3254 }
3255 #endif
3256 }
3257
3258 if (PrintVMOptions) {
3259 for (index = 0; index < args->nOptions; index++) {
3260 const JavaVMOption *option = args->options + index;
3261 if (match_option(option, "-XX:", &tail)) {
3262 logOption(tail);
3263 }
3264 }
3265 }
3266
3267 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3268 jint result = parse_vm_init_args(args);
3269 if (result != JNI_OK) {
3270 return result;
3271 }
3272
3273 // Delay warning until here so that we've had a chance to process
3274 // the -XX:-PrintWarnings flag
3275 if (needs_hotspotrc_warning) {
3276 warning("%s file is present but has been ignored. "
3277 "Run with -XX:Flags=%s to load the file.",
3278 hotspotrc, hotspotrc);
3279 }
3280
3281 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3282 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3283 #endif
3284
3285 #if INCLUDE_ALL_GCS
3286 #if (defined JAVASE_EMBEDDED || defined ARM)
3287 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3288 #endif
3289 #endif
3290
3291 #ifndef PRODUCT
3292 if (TraceBytecodesAt != 0) {
3293 TraceBytecodes = true;
3294 }
3295 if (CountCompiledCalls) {
3296 if (UseCounterDecay) {
3297 warning("UseCounterDecay disabled because CountCalls is set");
3298 UseCounterDecay = false;
3299 }
3300 }
3301 #endif // PRODUCT
3302
3303 // JSR 292 is not supported before 1.7
3304 if (!JDK_Version::is_gte_jdk17x_version()) {
3305 if (EnableInvokeDynamic) {
3306 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3307 warning("JSR 292 is not supported before 1.7. Disabling support.");
3308 }
3309 EnableInvokeDynamic = false;
3310 }
3311 }
3312
3313 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3314 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3315 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3316 }
3317 ScavengeRootsInCode = 1;
3318 }
3319
3320 if (PrintGCDetails) {
3321 // Turn on -verbose:gc options as well
3322 PrintGC = true;
3323 }
3324
3325 if (!JDK_Version::is_gte_jdk18x_version()) {
3326 // To avoid changing the log format for 7 updates this flag is only
3327 // true by default in JDK8 and above.
3328 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3329 FLAG_SET_DEFAULT(PrintGCCause, false);
3330 }
3331 }
3332
3333 // Set object alignment values.
3334 set_object_alignment();
3335
3336 #if !INCLUDE_ALL_GCS
3337 force_serial_gc();
3338 #endif // INCLUDE_ALL_GCS
3339 #if !INCLUDE_CDS
3340 if (DumpSharedSpaces || RequireSharedSpaces) {
3341 jio_fprintf(defaultStream::error_stream(),
3342 "Shared spaces are not supported in this VM\n");
3343 return JNI_ERR;
3344 }
3345 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3346 warning("Shared spaces are not supported in this VM");
3347 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3348 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3349 }
3350 no_shared_spaces();
3351 #endif // INCLUDE_CDS
3352
3353 // Set flags based on ergonomics.
3354 set_ergonomics_flags();
3355
3356 set_shared_spaces_flags();
3357
3358 // Check the GC selections again.
3359 if (!check_gc_consistency()) {
3360 return JNI_EINVAL;
3361 }
3362
3363 if (TieredCompilation) {
3364 set_tiered_flags();
3365 } else {
3366 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3367 if (CompilationPolicyChoice >= 2) {
3368 vm_exit_during_initialization(
3369 "Incompatible compilation policy selected", NULL);
3370 }
3371 }
3372
3373 // Set heap size based on available physical memory
3374 set_heap_size();
3375
3376 #if INCLUDE_ALL_GCS
3377 // Set per-collector flags
3378 if (UseParallelGC || UseParallelOldGC) {
3379 set_parallel_gc_flags();
3380 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3381 set_cms_and_parnew_gc_flags();
3382 } else if (UseParNewGC) { // skipped if CMS is set above
3383 set_parnew_gc_flags();
3384 } else if (UseG1GC) {
3385 set_g1_gc_flags();
3386 }
3387 check_deprecated_gcs();
3388 check_deprecated_gc_flags();
3389 if (AssumeMP && !UseSerialGC) {
3390 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3391 warning("If the number of processors is expected to increase from one, then"
3392 " you should configure the number of parallel GC threads appropriately"
3393 " using -XX:ParallelGCThreads=N");
3394 }
3395 }
3396 #else // INCLUDE_ALL_GCS
3397 assert(verify_serial_gc_flags(), "SerialGC unset");
3398 #endif // INCLUDE_ALL_GCS
3399
3400 // Set bytecode rewriting flags
3401 set_bytecode_flags();
3402
3403 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3404 set_aggressive_opts_flags();
3405
3406 // Turn off biased locking for locking debug mode flags,
3407 // which are subtlely different from each other but neither works with
3408 // biased locking.
3409 if (UseHeavyMonitors
3410 #ifdef COMPILER1
3411 || !UseFastLocking
3412 #endif // COMPILER1
3413 ) {
3414 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3415 // flag set to true on command line; warn the user that they
3416 // can't enable biased locking here
3417 warning("Biased Locking is not supported with locking debug flags"
3418 "; ignoring UseBiasedLocking flag." );
3419 }
3420 UseBiasedLocking = false;
3421 }
3422
3423 #ifdef CC_INTERP
3424 // Clear flags not supported by the C++ interpreter
3425 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3426 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3427 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3428 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
3429 #endif // CC_INTERP
3430
3431 #ifdef COMPILER2
3432 if (!UseBiasedLocking || EmitSync != 0) {
3433 UseOptoBiasInlining = false;
3434 }
3435 if (!EliminateLocks) {
3436 EliminateNestedLocks = false;
3437 }
3438 if (!Inline) {
3439 IncrementalInline = false;
3440 }
3441 #ifndef PRODUCT
3442 if (!IncrementalInline) {
3443 AlwaysIncrementalInline = false;
3444 }
3445 #endif
3446 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3447 // incremental inlining: bump MaxNodeLimit
3448 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3449 }
3450 #endif
3451
3452 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3453 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3454 DebugNonSafepoints = true;
3455 }
3456
3457 #ifndef PRODUCT
3458 if (CompileTheWorld) {
3459 // Force NmethodSweeper to sweep whole CodeCache each time.
3460 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3461 NmethodSweepFraction = 1;
3462 }
3463 }
3464 #endif
3465
3466 if (PrintCommandLineFlags) {
3467 CommandLineFlags::printSetFlags(tty);
3468 }
3469
3470 // Apply CPU specific policy for the BiasedLocking
3471 if (UseBiasedLocking) {
3472 if (!VM_Version::use_biased_locking() &&
3473 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3474 UseBiasedLocking = false;
3475 }
3476 }
3477
3478 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3479 // but only if not already set on the commandline
3480 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3481 bool set = false;
3482 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3483 if (!set) {
3484 FLAG_SET_DEFAULT(PauseAtExit, true);
3485 }
3486 }
3487
3488 return JNI_OK;
3489 }
3490
3491 jint Arguments::adjust_after_os() {
3492 #if INCLUDE_ALL_GCS
3493 if (UseParallelGC || UseParallelOldGC) {
3494 if (UseNUMA) {
3495 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3496 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3497 }
3498 // For those collectors or operating systems (eg, Windows) that do
3499 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3500 UseNUMAInterleaving = true;
3501 }
3502 }
3503 #endif // INCLUDE_ALL_GCS
3504 return JNI_OK;
3505 }
3506
3507 int Arguments::PropertyList_count(SystemProperty* pl) {
3508 int count = 0;
3509 while(pl != NULL) {
3510 count++;
3511 pl = pl->next();
3512 }
3513 return count;
3514 }
3515
3516 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3517 assert(key != NULL, "just checking");
3518 SystemProperty* prop;
3519 for (prop = pl; prop != NULL; prop = prop->next()) {
3520 if (strcmp(key, prop->key()) == 0) return prop->value();
3521 }
3522 return NULL;
3523 }
3524
3525 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3526 int count = 0;
3527 const char* ret_val = NULL;
3528
3529 while(pl != NULL) {
3530 if(count >= index) {
3531 ret_val = pl->key();
3532 break;
3533 }
3534 count++;
3535 pl = pl->next();
3536 }
3537
3538 return ret_val;
3539 }
3540
3541 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3542 int count = 0;
3543 char* ret_val = NULL;
3544
3545 while(pl != NULL) {
3546 if(count >= index) {
3547 ret_val = pl->value();
3548 break;
3549 }
3550 count++;
3551 pl = pl->next();
3552 }
3553
3554 return ret_val;
3555 }
3556
3557 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3558 SystemProperty* p = *plist;
3559 if (p == NULL) {
3560 *plist = new_p;
3561 } else {
3562 while (p->next() != NULL) {
3563 p = p->next();
3564 }
3565 p->set_next(new_p);
3566 }
3567 }
3568
3569 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3570 if (plist == NULL)
3571 return;
3572
3573 SystemProperty* new_p = new SystemProperty(k, v, true);
3574 PropertyList_add(plist, new_p);
3575 }
3576
3577 // This add maintains unique property key in the list.
3578 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3579 if (plist == NULL)
3580 return;
3581
3582 // If property key exist then update with new value.
3583 SystemProperty* prop;
3584 for (prop = *plist; prop != NULL; prop = prop->next()) {
3585 if (strcmp(k, prop->key()) == 0) {
3586 if (append) {
3587 prop->append_value(v);
3588 } else {
3589 prop->set_value(v);
3590 }
3591 return;
3592 }
3593 }
3594
3595 PropertyList_add(plist, k, v);
3596 }
3597
3598 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3599 // Returns true if all of the source pointed by src has been copied over to
3600 // the destination buffer pointed by buf. Otherwise, returns false.
3601 // Notes:
3602 // 1. If the length (buflen) of the destination buffer excluding the
3603 // NULL terminator character is not long enough for holding the expanded
3604 // pid characters, it also returns false instead of returning the partially
3605 // expanded one.
3606 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3607 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3608 char* buf, size_t buflen) {
3609 const char* p = src;
3610 char* b = buf;
3611 const char* src_end = &src[srclen];
3612 char* buf_end = &buf[buflen - 1];
3613
3614 while (p < src_end && b < buf_end) {
3615 if (*p == '%') {
3616 switch (*(++p)) {
3617 case '%': // "%%" ==> "%"
3618 *b++ = *p++;
3619 break;
3620 case 'p': { // "%p" ==> current process id
3621 // buf_end points to the character before the last character so
3622 // that we could write '\0' to the end of the buffer.
3623 size_t buf_sz = buf_end - b + 1;
3624 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3625
3626 // if jio_snprintf fails or the buffer is not long enough to hold
3627 // the expanded pid, returns false.
3628 if (ret < 0 || ret >= (int)buf_sz) {
3629 return false;
3630 } else {
3631 b += ret;
3632 assert(*b == '\0', "fail in copy_expand_pid");
3633 if (p == src_end && b == buf_end + 1) {
3634 // reach the end of the buffer.
3635 return true;
3636 }
3637 }
3638 p++;
3639 break;
3640 }
3641 default :
3642 *b++ = '%';
3643 }
3644 } else {
3645 *b++ = *p++;
3646 }
3647 }
3648 *b = '\0';
3649 return (p == src_end); // return false if not all of the source was copied
3650 }