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src/share/vm/runtime/arguments.cpp@db9981fd3124
src/share/vm/runtime/arguments.cpp
Wed, 23 Jan 2013 13:02:39 -0500
- author
- jprovino
- date
- Wed, 23 Jan 2013 13:02:39 -0500
- changeset 4542
- db9981fd3124
- parent 4415
- f1c06dcee0b5
- child 4543
- 8391fdd36e1f
- permissions
- -rw-r--r--
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
Summary: Rename INCLUDE_ALTERNATE_GCS to INCLUDE_ALL_GCS and replace SERIALGC with INCLUDE_ALL_GCS.
Reviewed-by: coleenp, stefank
1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
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
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"
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;
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;
87 char* Arguments::SharedArchivePath = NULL;
89 AgentLibraryList Arguments::_libraryList;
90 AgentLibraryList Arguments::_agentList;
92 abort_hook_t Arguments::_abort_hook = NULL;
93 exit_hook_t Arguments::_exit_hook = NULL;
94 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
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;
105 char* Arguments::_meta_index_path = NULL;
106 char* Arguments::_meta_index_dir = NULL;
108 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
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 }
121 static void logOption(const char* opt) {
122 if (PrintVMOptions) {
123 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
124 }
125 }
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;
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 }
147 // Initialize system properties key and value.
148 void Arguments::init_system_properties() {
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));
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);
166 _java_class_path = new SystemProperty("java.class.path", "", true);
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);
177 // Set OS specific system properties values
178 os::init_system_properties_values();
179 }
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;
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);
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 }
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;
217 static ObsoleteFlag obsolete_jvm_flags[] = {
218 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
230 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
231 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
232 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
233 { "DefaultInitialRAMFraction",
234 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
235 { "UseDepthFirstScavengeOrder",
236 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
237 { "HandlePromotionFailure",
238 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
239 { "MaxLiveObjectEvacuationRatio",
240 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
241 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
242 { "UseParallelOldGCCompacting",
243 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
244 { "UseParallelDensePrefixUpdate",
245 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
246 { "UseParallelOldGCDensePrefix",
247 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
248 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
249 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
250 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
251 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
252 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
253 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
254 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
255 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
256 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
257 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
258 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
259 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
260 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
261 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
262 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
263 #ifdef PRODUCT
264 { "DesiredMethodLimit",
265 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
266 #endif // PRODUCT
267 { NULL, JDK_Version(0), JDK_Version(0) }
268 };
270 // Returns true if the flag is obsolete and fits into the range specified
271 // for being ignored. In the case that the flag is ignored, the 'version'
272 // value is filled in with the version number when the flag became
273 // obsolete so that that value can be displayed to the user.
274 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
275 int i = 0;
276 assert(version != NULL, "Must provide a version buffer");
277 while (obsolete_jvm_flags[i].name != NULL) {
278 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
279 // <flag>=xxx form
280 // [-|+]<flag> form
281 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
282 ((s[0] == '+' || s[0] == '-') &&
283 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
284 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
285 *version = flag_status.obsoleted_in;
286 return true;
287 }
288 }
289 i++;
290 }
291 return false;
292 }
294 // Constructs the system class path (aka boot class path) from the following
295 // components, in order:
296 //
297 // prefix // from -Xbootclasspath/p:...
298 // endorsed // the expansion of -Djava.endorsed.dirs=...
299 // base // from os::get_system_properties() or -Xbootclasspath=
300 // suffix // from -Xbootclasspath/a:...
301 //
302 // java.endorsed.dirs is a list of directories; any jar or zip files in the
303 // directories are added to the sysclasspath just before the base.
304 //
305 // This could be AllStatic, but it isn't needed after argument processing is
306 // complete.
307 class SysClassPath: public StackObj {
308 public:
309 SysClassPath(const char* base);
310 ~SysClassPath();
312 inline void set_base(const char* base);
313 inline void add_prefix(const char* prefix);
314 inline void add_suffix_to_prefix(const char* suffix);
315 inline void add_suffix(const char* suffix);
316 inline void reset_path(const char* base);
318 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
319 // property. Must be called after all command-line arguments have been
320 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
321 // combined_path().
322 void expand_endorsed();
324 inline const char* get_base() const { return _items[_scp_base]; }
325 inline const char* get_prefix() const { return _items[_scp_prefix]; }
326 inline const char* get_suffix() const { return _items[_scp_suffix]; }
327 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
329 // Combine all the components into a single c-heap-allocated string; caller
330 // must free the string if/when no longer needed.
331 char* combined_path();
333 private:
334 // Utility routines.
335 static char* add_to_path(const char* path, const char* str, bool prepend);
336 static char* add_jars_to_path(char* path, const char* directory);
338 inline void reset_item_at(int index);
340 // Array indices for the items that make up the sysclasspath. All except the
341 // base are allocated in the C heap and freed by this class.
342 enum {
343 _scp_prefix, // from -Xbootclasspath/p:...
344 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
345 _scp_base, // the default sysclasspath
346 _scp_suffix, // from -Xbootclasspath/a:...
347 _scp_nitems // the number of items, must be last.
348 };
350 const char* _items[_scp_nitems];
351 DEBUG_ONLY(bool _expansion_done;)
352 };
354 SysClassPath::SysClassPath(const char* base) {
355 memset(_items, 0, sizeof(_items));
356 _items[_scp_base] = base;
357 DEBUG_ONLY(_expansion_done = false;)
358 }
360 SysClassPath::~SysClassPath() {
361 // Free everything except the base.
362 for (int i = 0; i < _scp_nitems; ++i) {
363 if (i != _scp_base) reset_item_at(i);
364 }
365 DEBUG_ONLY(_expansion_done = false;)
366 }
368 inline void SysClassPath::set_base(const char* base) {
369 _items[_scp_base] = base;
370 }
372 inline void SysClassPath::add_prefix(const char* prefix) {
373 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
374 }
376 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
377 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
378 }
380 inline void SysClassPath::add_suffix(const char* suffix) {
381 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
382 }
384 inline void SysClassPath::reset_item_at(int index) {
385 assert(index < _scp_nitems && index != _scp_base, "just checking");
386 if (_items[index] != NULL) {
387 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
388 _items[index] = NULL;
389 }
390 }
392 inline void SysClassPath::reset_path(const char* base) {
393 // Clear the prefix and suffix.
394 reset_item_at(_scp_prefix);
395 reset_item_at(_scp_suffix);
396 set_base(base);
397 }
399 //------------------------------------------------------------------------------
401 void SysClassPath::expand_endorsed() {
402 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
404 const char* path = Arguments::get_property("java.endorsed.dirs");
405 if (path == NULL) {
406 path = Arguments::get_endorsed_dir();
407 assert(path != NULL, "no default for java.endorsed.dirs");
408 }
410 char* expanded_path = NULL;
411 const char separator = *os::path_separator();
412 const char* const end = path + strlen(path);
413 while (path < end) {
414 const char* tmp_end = strchr(path, separator);
415 if (tmp_end == NULL) {
416 expanded_path = add_jars_to_path(expanded_path, path);
417 path = end;
418 } else {
419 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
420 memcpy(dirpath, path, tmp_end - path);
421 dirpath[tmp_end - path] = '\0';
422 expanded_path = add_jars_to_path(expanded_path, dirpath);
423 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
424 path = tmp_end + 1;
425 }
426 }
427 _items[_scp_endorsed] = expanded_path;
428 DEBUG_ONLY(_expansion_done = true;)
429 }
431 // Combine the bootclasspath elements, some of which may be null, into a single
432 // c-heap-allocated string.
433 char* SysClassPath::combined_path() {
434 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
435 assert(_expansion_done, "must call expand_endorsed() first.");
437 size_t lengths[_scp_nitems];
438 size_t total_len = 0;
440 const char separator = *os::path_separator();
442 // Get the lengths.
443 int i;
444 for (i = 0; i < _scp_nitems; ++i) {
445 if (_items[i] != NULL) {
446 lengths[i] = strlen(_items[i]);
447 // Include space for the separator char (or a NULL for the last item).
448 total_len += lengths[i] + 1;
449 }
450 }
451 assert(total_len > 0, "empty sysclasspath not allowed");
453 // Copy the _items to a single string.
454 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
455 char* cp_tmp = cp;
456 for (i = 0; i < _scp_nitems; ++i) {
457 if (_items[i] != NULL) {
458 memcpy(cp_tmp, _items[i], lengths[i]);
459 cp_tmp += lengths[i];
460 *cp_tmp++ = separator;
461 }
462 }
463 *--cp_tmp = '\0'; // Replace the extra separator.
464 return cp;
465 }
467 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
468 char*
469 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
470 char *cp;
472 assert(str != NULL, "just checking");
473 if (path == NULL) {
474 size_t len = strlen(str) + 1;
475 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
476 memcpy(cp, str, len); // copy the trailing null
477 } else {
478 const char separator = *os::path_separator();
479 size_t old_len = strlen(path);
480 size_t str_len = strlen(str);
481 size_t len = old_len + str_len + 2;
483 if (prepend) {
484 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
485 char* cp_tmp = cp;
486 memcpy(cp_tmp, str, str_len);
487 cp_tmp += str_len;
488 *cp_tmp = separator;
489 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
490 FREE_C_HEAP_ARRAY(char, path, mtInternal);
491 } else {
492 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
493 char* cp_tmp = cp + old_len;
494 *cp_tmp = separator;
495 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
496 }
497 }
498 return cp;
499 }
501 // Scan the directory and append any jar or zip files found to path.
502 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
503 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
504 DIR* dir = os::opendir(directory);
505 if (dir == NULL) return path;
507 char dir_sep[2] = { '\0', '\0' };
508 size_t directory_len = strlen(directory);
509 const char fileSep = *os::file_separator();
510 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
512 /* Scan the directory for jars/zips, appending them to path. */
513 struct dirent *entry;
514 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
515 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
516 const char* name = entry->d_name;
517 const char* ext = name + strlen(name) - 4;
518 bool isJarOrZip = ext > name &&
519 (os::file_name_strcmp(ext, ".jar") == 0 ||
520 os::file_name_strcmp(ext, ".zip") == 0);
521 if (isJarOrZip) {
522 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
523 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
524 path = add_to_path(path, jarpath, false);
525 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
526 }
527 }
528 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
529 os::closedir(dir);
530 return path;
531 }
533 // Parses a memory size specification string.
534 static bool atomull(const char *s, julong* result) {
535 julong n = 0;
536 int args_read = sscanf(s, os::julong_format_specifier(), &n);
537 if (args_read != 1) {
538 return false;
539 }
540 while (*s != '\0' && isdigit(*s)) {
541 s++;
542 }
543 // 4705540: illegal if more characters are found after the first non-digit
544 if (strlen(s) > 1) {
545 return false;
546 }
547 switch (*s) {
548 case 'T': case 't':
549 *result = n * G * K;
550 // Check for overflow.
551 if (*result/((julong)G * K) != n) return false;
552 return true;
553 case 'G': case 'g':
554 *result = n * G;
555 if (*result/G != n) return false;
556 return true;
557 case 'M': case 'm':
558 *result = n * M;
559 if (*result/M != n) return false;
560 return true;
561 case 'K': case 'k':
562 *result = n * K;
563 if (*result/K != n) return false;
564 return true;
565 case '\0':
566 *result = n;
567 return true;
568 default:
569 return false;
570 }
571 }
573 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
574 if (size < min_size) return arg_too_small;
575 // Check that size will fit in a size_t (only relevant on 32-bit)
576 if (size > max_uintx) return arg_too_big;
577 return arg_in_range;
578 }
580 // Describe an argument out of range error
581 void Arguments::describe_range_error(ArgsRange errcode) {
582 switch(errcode) {
583 case arg_too_big:
584 jio_fprintf(defaultStream::error_stream(),
585 "The specified size exceeds the maximum "
586 "representable size.\n");
587 break;
588 case arg_too_small:
589 case arg_unreadable:
590 case arg_in_range:
591 // do nothing for now
592 break;
593 default:
594 ShouldNotReachHere();
595 }
596 }
598 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
599 return CommandLineFlags::boolAtPut(name, &value, origin);
600 }
602 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
603 double v;
604 if (sscanf(value, "%lf", &v) != 1) {
605 return false;
606 }
608 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
609 return true;
610 }
611 return false;
612 }
614 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
615 julong v;
616 intx intx_v;
617 bool is_neg = false;
618 // Check the sign first since atomull() parses only unsigned values.
619 if (*value == '-') {
620 if (!CommandLineFlags::intxAt(name, &intx_v)) {
621 return false;
622 }
623 value++;
624 is_neg = true;
625 }
626 if (!atomull(value, &v)) {
627 return false;
628 }
629 intx_v = (intx) v;
630 if (is_neg) {
631 intx_v = -intx_v;
632 }
633 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
634 return true;
635 }
636 uintx uintx_v = (uintx) v;
637 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
638 return true;
639 }
640 uint64_t uint64_t_v = (uint64_t) v;
641 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
642 return true;
643 }
644 return false;
645 }
647 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
648 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
649 // Contract: CommandLineFlags always returns a pointer that needs freeing.
650 FREE_C_HEAP_ARRAY(char, value, mtInternal);
651 return true;
652 }
654 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
655 const char* old_value = "";
656 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
657 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
658 size_t new_len = strlen(new_value);
659 const char* value;
660 char* free_this_too = NULL;
661 if (old_len == 0) {
662 value = new_value;
663 } else if (new_len == 0) {
664 value = old_value;
665 } else {
666 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
667 // each new setting adds another LINE to the switch:
668 sprintf(buf, "%s\n%s", old_value, new_value);
669 value = buf;
670 free_this_too = buf;
671 }
672 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
673 // CommandLineFlags always returns a pointer that needs freeing.
674 FREE_C_HEAP_ARRAY(char, value, mtInternal);
675 if (free_this_too != NULL) {
676 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
677 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
678 }
679 return true;
680 }
682 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
684 // range of acceptable characters spelled out for portability reasons
685 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
686 #define BUFLEN 255
687 char name[BUFLEN+1];
688 char dummy;
690 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
691 return set_bool_flag(name, false, origin);
692 }
693 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
694 return set_bool_flag(name, true, origin);
695 }
697 char punct;
698 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
699 const char* value = strchr(arg, '=') + 1;
700 Flag* flag = Flag::find_flag(name, strlen(name));
701 if (flag != NULL && flag->is_ccstr()) {
702 if (flag->ccstr_accumulates()) {
703 return append_to_string_flag(name, value, origin);
704 } else {
705 if (value[0] == '\0') {
706 value = NULL;
707 }
708 return set_string_flag(name, value, origin);
709 }
710 }
711 }
713 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
714 const char* value = strchr(arg, '=') + 1;
715 // -XX:Foo:=xxx will reset the string flag to the given value.
716 if (value[0] == '\0') {
717 value = NULL;
718 }
719 return set_string_flag(name, value, origin);
720 }
722 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
723 #define SIGNED_NUMBER_RANGE "[-0123456789]"
724 #define NUMBER_RANGE "[0123456789]"
725 char value[BUFLEN + 1];
726 char value2[BUFLEN + 1];
727 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
728 // Looks like a floating-point number -- try again with more lenient format string
729 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
730 return set_fp_numeric_flag(name, value, origin);
731 }
732 }
734 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
735 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
736 return set_numeric_flag(name, value, origin);
737 }
739 return false;
740 }
742 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
743 assert(bldarray != NULL, "illegal argument");
745 if (arg == NULL) {
746 return;
747 }
749 int index = *count;
751 // expand the array and add arg to the last element
752 (*count)++;
753 if (*bldarray == NULL) {
754 *bldarray = NEW_C_HEAP_ARRAY(char*, *count, mtInternal);
755 } else {
756 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count, mtInternal);
757 }
758 (*bldarray)[index] = strdup(arg);
759 }
761 void Arguments::build_jvm_args(const char* arg) {
762 add_string(&_jvm_args_array, &_num_jvm_args, arg);
763 }
765 void Arguments::build_jvm_flags(const char* arg) {
766 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
767 }
769 // utility function to return a string that concatenates all
770 // strings in a given char** array
771 const char* Arguments::build_resource_string(char** args, int count) {
772 if (args == NULL || count == 0) {
773 return NULL;
774 }
775 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
776 for (int i = 1; i < count; i++) {
777 length += strlen(args[i]) + 1; // add 1 for a space
778 }
779 char* s = NEW_RESOURCE_ARRAY(char, length);
780 strcpy(s, args[0]);
781 for (int j = 1; j < count; j++) {
782 strcat(s, " ");
783 strcat(s, args[j]);
784 }
785 return (const char*) s;
786 }
788 void Arguments::print_on(outputStream* st) {
789 st->print_cr("VM Arguments:");
790 if (num_jvm_flags() > 0) {
791 st->print("jvm_flags: "); print_jvm_flags_on(st);
792 }
793 if (num_jvm_args() > 0) {
794 st->print("jvm_args: "); print_jvm_args_on(st);
795 }
796 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
797 if (_java_class_path != NULL) {
798 char* path = _java_class_path->value();
799 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
800 }
801 st->print_cr("Launcher Type: %s", _sun_java_launcher);
802 }
804 void Arguments::print_jvm_flags_on(outputStream* st) {
805 if (_num_jvm_flags > 0) {
806 for (int i=0; i < _num_jvm_flags; i++) {
807 st->print("%s ", _jvm_flags_array[i]);
808 }
809 st->print_cr("");
810 }
811 }
813 void Arguments::print_jvm_args_on(outputStream* st) {
814 if (_num_jvm_args > 0) {
815 for (int i=0; i < _num_jvm_args; i++) {
816 st->print("%s ", _jvm_args_array[i]);
817 }
818 st->print_cr("");
819 }
820 }
822 bool Arguments::process_argument(const char* arg,
823 jboolean ignore_unrecognized, FlagValueOrigin origin) {
825 JDK_Version since = JDK_Version();
827 if (parse_argument(arg, origin) || ignore_unrecognized) {
828 return true;
829 }
831 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg;
832 if (is_newly_obsolete(arg, &since)) {
833 char version[256];
834 since.to_string(version, sizeof(version));
835 warning("ignoring option %s; support was removed in %s", argname, version);
836 return true;
837 }
839 // For locked flags, report a custom error message if available.
840 // Otherwise, report the standard unrecognized VM option.
842 Flag* locked_flag = Flag::find_flag((char*)argname, strlen(argname), true);
843 if (locked_flag != NULL) {
844 char locked_message_buf[BUFLEN];
845 locked_flag->get_locked_message(locked_message_buf, BUFLEN);
846 if (strlen(locked_message_buf) == 0) {
847 jio_fprintf(defaultStream::error_stream(),
848 "Unrecognized VM option '%s'\n", argname);
849 } else {
850 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
851 }
852 } else {
853 jio_fprintf(defaultStream::error_stream(),
854 "Unrecognized VM option '%s'\n", argname);
855 }
857 // allow for commandline "commenting out" options like -XX:#+Verbose
858 return arg[0] == '#';
859 }
861 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
862 FILE* stream = fopen(file_name, "rb");
863 if (stream == NULL) {
864 if (should_exist) {
865 jio_fprintf(defaultStream::error_stream(),
866 "Could not open settings file %s\n", file_name);
867 return false;
868 } else {
869 return true;
870 }
871 }
873 char token[1024];
874 int pos = 0;
876 bool in_white_space = true;
877 bool in_comment = false;
878 bool in_quote = false;
879 char quote_c = 0;
880 bool result = true;
882 int c = getc(stream);
883 while(c != EOF && pos < (int)(sizeof(token)-1)) {
884 if (in_white_space) {
885 if (in_comment) {
886 if (c == '\n') in_comment = false;
887 } else {
888 if (c == '#') in_comment = true;
889 else if (!isspace(c)) {
890 in_white_space = false;
891 token[pos++] = c;
892 }
893 }
894 } else {
895 if (c == '\n' || (!in_quote && isspace(c))) {
896 // token ends at newline, or at unquoted whitespace
897 // this allows a way to include spaces in string-valued options
898 token[pos] = '\0';
899 logOption(token);
900 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
901 build_jvm_flags(token);
902 pos = 0;
903 in_white_space = true;
904 in_quote = false;
905 } else if (!in_quote && (c == '\'' || c == '"')) {
906 in_quote = true;
907 quote_c = c;
908 } else if (in_quote && (c == quote_c)) {
909 in_quote = false;
910 } else {
911 token[pos++] = c;
912 }
913 }
914 c = getc(stream);
915 }
916 if (pos > 0) {
917 token[pos] = '\0';
918 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
919 build_jvm_flags(token);
920 }
921 fclose(stream);
922 return result;
923 }
925 //=============================================================================================================
926 // Parsing of properties (-D)
928 const char* Arguments::get_property(const char* key) {
929 return PropertyList_get_value(system_properties(), key);
930 }
932 bool Arguments::add_property(const char* prop) {
933 const char* eq = strchr(prop, '=');
934 char* key;
935 // ns must be static--its address may be stored in a SystemProperty object.
936 const static char ns[1] = {0};
937 char* value = (char *)ns;
939 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
940 key = AllocateHeap(key_len + 1, mtInternal);
941 strncpy(key, prop, key_len);
942 key[key_len] = '\0';
944 if (eq != NULL) {
945 size_t value_len = strlen(prop) - key_len - 1;
946 value = AllocateHeap(value_len + 1, mtInternal);
947 strncpy(value, &prop[key_len + 1], value_len + 1);
948 }
950 if (strcmp(key, "java.compiler") == 0) {
951 process_java_compiler_argument(value);
952 FreeHeap(key);
953 if (eq != NULL) {
954 FreeHeap(value);
955 }
956 return true;
957 } else if (strcmp(key, "sun.java.command") == 0) {
958 _java_command = value;
960 // Record value in Arguments, but let it get passed to Java.
961 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
962 // launcher.pid property is private and is processed
963 // in process_sun_java_launcher_properties();
964 // the sun.java.launcher property is passed on to the java application
965 FreeHeap(key);
966 if (eq != NULL) {
967 FreeHeap(value);
968 }
969 return true;
970 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
971 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
972 // its value without going through the property list or making a Java call.
973 _java_vendor_url_bug = value;
974 } else if (strcmp(key, "sun.boot.library.path") == 0) {
975 PropertyList_unique_add(&_system_properties, key, value, true);
976 return true;
977 }
978 // Create new property and add at the end of the list
979 PropertyList_unique_add(&_system_properties, key, value);
980 return true;
981 }
983 //===========================================================================================================
984 // Setting int/mixed/comp mode flags
986 void Arguments::set_mode_flags(Mode mode) {
987 // Set up default values for all flags.
988 // If you add a flag to any of the branches below,
989 // add a default value for it here.
990 set_java_compiler(false);
991 _mode = mode;
993 // Ensure Agent_OnLoad has the correct initial values.
994 // This may not be the final mode; mode may change later in onload phase.
995 PropertyList_unique_add(&_system_properties, "java.vm.info",
996 (char*)VM_Version::vm_info_string(), false);
998 UseInterpreter = true;
999 UseCompiler = true;
1000 UseLoopCounter = true;
1002 #ifndef ZERO
1003 // Turn these off for mixed and comp. Leave them on for Zero.
1004 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1005 UseFastAccessorMethods = (mode == _int);
1006 }
1007 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1008 UseFastEmptyMethods = (mode == _int);
1009 }
1010 #endif
1012 // Default values may be platform/compiler dependent -
1013 // use the saved values
1014 ClipInlining = Arguments::_ClipInlining;
1015 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1016 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1017 BackgroundCompilation = Arguments::_BackgroundCompilation;
1019 // Change from defaults based on mode
1020 switch (mode) {
1021 default:
1022 ShouldNotReachHere();
1023 break;
1024 case _int:
1025 UseCompiler = false;
1026 UseLoopCounter = false;
1027 AlwaysCompileLoopMethods = false;
1028 UseOnStackReplacement = false;
1029 break;
1030 case _mixed:
1031 // same as default
1032 break;
1033 case _comp:
1034 UseInterpreter = false;
1035 BackgroundCompilation = false;
1036 ClipInlining = false;
1037 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1038 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1039 // compile a level 4 (C2) and then continue executing it.
1040 if (TieredCompilation) {
1041 Tier3InvokeNotifyFreqLog = 0;
1042 Tier4InvocationThreshold = 0;
1043 }
1044 break;
1045 }
1046 }
1048 // Conflict: required to use shared spaces (-Xshare:on), but
1049 // incompatible command line options were chosen.
1051 static void no_shared_spaces() {
1052 if (RequireSharedSpaces) {
1053 jio_fprintf(defaultStream::error_stream(),
1054 "Class data sharing is inconsistent with other specified options.\n");
1055 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1056 } else {
1057 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1058 }
1059 }
1061 void Arguments::set_tiered_flags() {
1062 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1063 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1064 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1065 }
1066 if (CompilationPolicyChoice < 2) {
1067 vm_exit_during_initialization(
1068 "Incompatible compilation policy selected", NULL);
1069 }
1070 // Increase the code cache size - tiered compiles a lot more.
1071 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1072 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1073 }
1074 }
1076 #if INCLUDE_ALL_GCS
1077 static void disable_adaptive_size_policy(const char* collector_name) {
1078 if (UseAdaptiveSizePolicy) {
1079 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1080 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1081 collector_name);
1082 }
1083 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1084 }
1085 }
1087 void Arguments::set_parnew_gc_flags() {
1088 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1089 "control point invariant");
1090 assert(UseParNewGC, "Error");
1092 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1093 disable_adaptive_size_policy("UseParNewGC");
1095 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1096 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1097 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1098 } else if (ParallelGCThreads == 0) {
1099 jio_fprintf(defaultStream::error_stream(),
1100 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1101 vm_exit(1);
1102 }
1104 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1105 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1106 // we set them to 1024 and 1024.
1107 // See CR 6362902.
1108 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1109 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1110 }
1111 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1112 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1113 }
1115 // AlwaysTenure flag should make ParNew promote all at first collection.
1116 // See CR 6362902.
1117 if (AlwaysTenure) {
1118 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1119 }
1120 // When using compressed oops, we use local overflow stacks,
1121 // rather than using a global overflow list chained through
1122 // the klass word of the object's pre-image.
1123 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1124 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1125 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1126 }
1127 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1128 }
1129 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1130 }
1132 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1133 // sparc/solaris for certain applications, but would gain from
1134 // further optimization and tuning efforts, and would almost
1135 // certainly gain from analysis of platform and environment.
1136 void Arguments::set_cms_and_parnew_gc_flags() {
1137 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1138 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1140 // If we are using CMS, we prefer to UseParNewGC,
1141 // unless explicitly forbidden.
1142 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1143 FLAG_SET_ERGO(bool, UseParNewGC, true);
1144 }
1146 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1147 disable_adaptive_size_policy("UseConcMarkSweepGC");
1149 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1150 // as needed.
1151 if (UseParNewGC) {
1152 set_parnew_gc_flags();
1153 }
1155 // MaxHeapSize is aligned down in collectorPolicy
1156 size_t max_heap = align_size_down(MaxHeapSize,
1157 CardTableRS::ct_max_alignment_constraint());
1159 // Now make adjustments for CMS
1160 intx tenuring_default = (intx)6;
1161 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1163 // Preferred young gen size for "short" pauses:
1164 // upper bound depends on # of threads and NewRatio.
1165 const uintx parallel_gc_threads =
1166 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1167 const size_t preferred_max_new_size_unaligned =
1168 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1169 size_t preferred_max_new_size =
1170 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1172 // Unless explicitly requested otherwise, size young gen
1173 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1175 // If either MaxNewSize or NewRatio is set on the command line,
1176 // assume the user is trying to set the size of the young gen.
1177 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1179 // Set MaxNewSize to our calculated preferred_max_new_size unless
1180 // NewSize was set on the command line and it is larger than
1181 // preferred_max_new_size.
1182 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1183 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1184 } else {
1185 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1186 }
1187 if (PrintGCDetails && Verbose) {
1188 // Too early to use gclog_or_tty
1189 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1190 }
1192 // Code along this path potentially sets NewSize and OldSize
1194 assert(max_heap >= InitialHeapSize, "Error");
1195 assert(max_heap >= NewSize, "Error");
1197 if (PrintGCDetails && Verbose) {
1198 // Too early to use gclog_or_tty
1199 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1200 " initial_heap_size: " SIZE_FORMAT
1201 " max_heap: " SIZE_FORMAT,
1202 min_heap_size(), InitialHeapSize, max_heap);
1203 }
1204 size_t min_new = preferred_max_new_size;
1205 if (FLAG_IS_CMDLINE(NewSize)) {
1206 min_new = NewSize;
1207 }
1208 if (max_heap > min_new && min_heap_size() > min_new) {
1209 // Unless explicitly requested otherwise, make young gen
1210 // at least min_new, and at most preferred_max_new_size.
1211 if (FLAG_IS_DEFAULT(NewSize)) {
1212 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1213 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1214 if (PrintGCDetails && Verbose) {
1215 // Too early to use gclog_or_tty
1216 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1217 }
1218 }
1219 // Unless explicitly requested otherwise, size old gen
1220 // so it's NewRatio x of NewSize.
1221 if (FLAG_IS_DEFAULT(OldSize)) {
1222 if (max_heap > NewSize) {
1223 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1224 if (PrintGCDetails && Verbose) {
1225 // Too early to use gclog_or_tty
1226 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1227 }
1228 }
1229 }
1230 }
1231 }
1232 // Unless explicitly requested otherwise, definitely
1233 // promote all objects surviving "tenuring_default" scavenges.
1234 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1235 FLAG_IS_DEFAULT(SurvivorRatio)) {
1236 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1237 }
1238 // If we decided above (or user explicitly requested)
1239 // `promote all' (via MaxTenuringThreshold := 0),
1240 // prefer minuscule survivor spaces so as not to waste
1241 // space for (non-existent) survivors
1242 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1243 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1244 }
1245 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1246 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1247 // This is done in order to make ParNew+CMS configuration to work
1248 // with YoungPLABSize and OldPLABSize options.
1249 // See CR 6362902.
1250 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1251 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1252 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1253 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1254 // the value (either from the command line or ergonomics) of
1255 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1256 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1257 } else {
1258 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1259 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1260 // we'll let it to take precedence.
1261 jio_fprintf(defaultStream::error_stream(),
1262 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1263 " options are specified for the CMS collector."
1264 " CMSParPromoteBlocksToClaim will take precedence.\n");
1265 }
1266 }
1267 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1268 // OldPLAB sizing manually turned off: Use a larger default setting,
1269 // unless it was manually specified. This is because a too-low value
1270 // will slow down scavenges.
1271 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1272 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1273 }
1274 }
1275 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1276 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1277 // If either of the static initialization defaults have changed, note this
1278 // modification.
1279 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1280 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1281 }
1282 if (PrintGCDetails && Verbose) {
1283 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1284 MarkStackSize / K, MarkStackSizeMax / K);
1285 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1286 }
1287 }
1288 #endif // INCLUDE_ALL_GCS
1290 void set_object_alignment() {
1291 // Object alignment.
1292 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1293 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1294 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1295 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1296 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1297 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1299 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1300 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1302 // Oop encoding heap max
1303 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1305 #if INCLUDE_ALL_GCS
1306 // Set CMS global values
1307 CompactibleFreeListSpace::set_cms_values();
1308 #endif // INCLUDE_ALL_GCS
1309 }
1311 bool verify_object_alignment() {
1312 // Object alignment.
1313 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1314 jio_fprintf(defaultStream::error_stream(),
1315 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1316 (int)ObjectAlignmentInBytes);
1317 return false;
1318 }
1319 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1320 jio_fprintf(defaultStream::error_stream(),
1321 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1322 (int)ObjectAlignmentInBytes, BytesPerLong);
1323 return false;
1324 }
1325 // It does not make sense to have big object alignment
1326 // since a space lost due to alignment will be greater
1327 // then a saved space from compressed oops.
1328 if ((int)ObjectAlignmentInBytes > 256) {
1329 jio_fprintf(defaultStream::error_stream(),
1330 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1331 (int)ObjectAlignmentInBytes);
1332 return false;
1333 }
1334 // In case page size is very small.
1335 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1336 jio_fprintf(defaultStream::error_stream(),
1337 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1338 (int)ObjectAlignmentInBytes, os::vm_page_size());
1339 return false;
1340 }
1341 return true;
1342 }
1344 inline uintx max_heap_for_compressed_oops() {
1345 // Avoid sign flip.
1346 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) {
1347 return 0;
1348 }
1349 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size());
1350 NOT_LP64(ShouldNotReachHere(); return 0);
1351 }
1353 bool Arguments::should_auto_select_low_pause_collector() {
1354 if (UseAutoGCSelectPolicy &&
1355 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1356 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1357 if (PrintGCDetails) {
1358 // Cannot use gclog_or_tty yet.
1359 tty->print_cr("Automatic selection of the low pause collector"
1360 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1361 }
1362 return true;
1363 }
1364 return false;
1365 }
1367 void Arguments::set_ergonomics_flags() {
1369 if (os::is_server_class_machine()) {
1370 // If no other collector is requested explicitly,
1371 // let the VM select the collector based on
1372 // machine class and automatic selection policy.
1373 if (!UseSerialGC &&
1374 !UseConcMarkSweepGC &&
1375 !UseG1GC &&
1376 !UseParNewGC &&
1377 FLAG_IS_DEFAULT(UseParallelGC)) {
1378 if (should_auto_select_low_pause_collector()) {
1379 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1380 } else {
1381 FLAG_SET_ERGO(bool, UseParallelGC, true);
1382 }
1383 }
1384 // Shared spaces work fine with other GCs but causes bytecode rewriting
1385 // to be disabled, which hurts interpreter performance and decreases
1386 // server performance. On server class machines, keep the default
1387 // off unless it is asked for. Future work: either add bytecode rewriting
1388 // at link time, or rewrite bytecodes in non-shared methods.
1389 if (!DumpSharedSpaces && !RequireSharedSpaces) {
1390 no_shared_spaces();
1391 }
1392 }
1394 #ifndef ZERO
1395 #ifdef _LP64
1396 // Check that UseCompressedOops can be set with the max heap size allocated
1397 // by ergonomics.
1398 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1399 #if !defined(COMPILER1) || defined(TIERED)
1400 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1401 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1402 }
1403 #endif
1404 #ifdef _WIN64
1405 if (UseLargePages && UseCompressedOops) {
1406 // Cannot allocate guard pages for implicit checks in indexed addressing
1407 // mode, when large pages are specified on windows.
1408 // This flag could be switched ON if narrow oop base address is set to 0,
1409 // see code in Universe::initialize_heap().
1410 Universe::set_narrow_oop_use_implicit_null_checks(false);
1411 }
1412 #endif // _WIN64
1413 } else {
1414 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1415 warning("Max heap size too large for Compressed Oops");
1416 FLAG_SET_DEFAULT(UseCompressedOops, false);
1417 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1418 }
1419 }
1420 // UseCompressedOops must be on for UseCompressedKlassPointers to be on.
1421 if (!UseCompressedOops) {
1422 if (UseCompressedKlassPointers) {
1423 warning("UseCompressedKlassPointers requires UseCompressedOops");
1424 }
1425 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1426 } else {
1427 // Turn on UseCompressedKlassPointers too
1428 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) {
1429 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true);
1430 }
1431 // Set the ClassMetaspaceSize to something that will not need to be
1432 // expanded, since it cannot be expanded.
1433 if (UseCompressedKlassPointers && FLAG_IS_DEFAULT(ClassMetaspaceSize)) {
1434 // 100,000 classes seems like a good size, so 100M assumes around 1K
1435 // per klass. The vtable and oopMap is embedded so we don't have a fixed
1436 // size per klass. Eventually, this will be parameterized because it
1437 // would also be useful to determine the optimal size of the
1438 // systemDictionary.
1439 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M);
1440 }
1441 }
1442 // Also checks that certain machines are slower with compressed oops
1443 // in vm_version initialization code.
1444 #endif // _LP64
1445 #endif // !ZERO
1446 }
1448 void Arguments::set_parallel_gc_flags() {
1449 assert(UseParallelGC || UseParallelOldGC, "Error");
1450 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1451 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1452 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1453 }
1454 FLAG_SET_DEFAULT(UseParallelGC, true);
1456 // If no heap maximum was requested explicitly, use some reasonable fraction
1457 // of the physical memory, up to a maximum of 1GB.
1458 FLAG_SET_DEFAULT(ParallelGCThreads,
1459 Abstract_VM_Version::parallel_worker_threads());
1460 if (ParallelGCThreads == 0) {
1461 jio_fprintf(defaultStream::error_stream(),
1462 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1463 vm_exit(1);
1464 }
1467 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1468 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1469 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1470 // See CR 6362902 for details.
1471 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1472 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1473 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1474 }
1475 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1476 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1477 }
1478 }
1480 if (UseParallelOldGC) {
1481 // Par compact uses lower default values since they are treated as
1482 // minimums. These are different defaults because of the different
1483 // interpretation and are not ergonomically set.
1484 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1485 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1486 }
1487 }
1488 }
1490 void Arguments::set_g1_gc_flags() {
1491 assert(UseG1GC, "Error");
1492 #ifdef COMPILER1
1493 FastTLABRefill = false;
1494 #endif
1495 FLAG_SET_DEFAULT(ParallelGCThreads,
1496 Abstract_VM_Version::parallel_worker_threads());
1497 if (ParallelGCThreads == 0) {
1498 FLAG_SET_DEFAULT(ParallelGCThreads,
1499 Abstract_VM_Version::parallel_worker_threads());
1500 }
1502 // MarkStackSize will be set (if it hasn't been set by the user)
1503 // when concurrent marking is initialized.
1504 // Its value will be based upon the number of parallel marking threads.
1505 // But we do set the maximum mark stack size here.
1506 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1507 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1508 }
1510 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1511 // In G1, we want the default GC overhead goal to be higher than
1512 // say in PS. So we set it here to 10%. Otherwise the heap might
1513 // be expanded more aggressively than we would like it to. In
1514 // fact, even 10% seems to not be high enough in some cases
1515 // (especially small GC stress tests that the main thing they do
1516 // is allocation). We might consider increase it further.
1517 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1518 }
1520 if (PrintGCDetails && Verbose) {
1521 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1522 MarkStackSize / K, MarkStackSizeMax / K);
1523 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1524 }
1525 }
1527 void Arguments::set_heap_size() {
1528 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1529 // Deprecated flag
1530 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1531 }
1533 const julong phys_mem =
1534 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1535 : (julong)MaxRAM;
1537 // If the maximum heap size has not been set with -Xmx,
1538 // then set it as fraction of the size of physical memory,
1539 // respecting the maximum and minimum sizes of the heap.
1540 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1541 julong reasonable_max = phys_mem / MaxRAMFraction;
1543 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1544 // Small physical memory, so use a minimum fraction of it for the heap
1545 reasonable_max = phys_mem / MinRAMFraction;
1546 } else {
1547 // Not-small physical memory, so require a heap at least
1548 // as large as MaxHeapSize
1549 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1550 }
1551 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1552 // Limit the heap size to ErgoHeapSizeLimit
1553 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1554 }
1555 if (UseCompressedOops) {
1556 // Limit the heap size to the maximum possible when using compressed oops
1557 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1558 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1559 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1560 // but it should be not less than default MaxHeapSize.
1561 max_coop_heap -= HeapBaseMinAddress;
1562 }
1563 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1564 }
1565 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1567 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1568 // An initial heap size was specified on the command line,
1569 // so be sure that the maximum size is consistent. Done
1570 // after call to allocatable_physical_memory because that
1571 // method might reduce the allocation size.
1572 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1573 }
1575 if (PrintGCDetails && Verbose) {
1576 // Cannot use gclog_or_tty yet.
1577 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1578 }
1579 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1580 }
1582 // If the initial_heap_size has not been set with InitialHeapSize
1583 // or -Xms, then set it as fraction of the size of physical memory,
1584 // respecting the maximum and minimum sizes of the heap.
1585 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1586 julong reasonable_minimum = (julong)(OldSize + NewSize);
1588 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1590 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1592 julong reasonable_initial = phys_mem / InitialRAMFraction;
1594 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1595 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1597 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1599 if (PrintGCDetails && Verbose) {
1600 // Cannot use gclog_or_tty yet.
1601 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1602 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1603 }
1604 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1605 set_min_heap_size((uintx)reasonable_minimum);
1606 }
1607 }
1609 // This must be called after ergonomics because we want bytecode rewriting
1610 // if the server compiler is used, or if UseSharedSpaces is disabled.
1611 void Arguments::set_bytecode_flags() {
1612 // Better not attempt to store into a read-only space.
1613 if (UseSharedSpaces) {
1614 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1615 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1616 }
1618 if (!RewriteBytecodes) {
1619 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1620 }
1621 }
1623 // Aggressive optimization flags -XX:+AggressiveOpts
1624 void Arguments::set_aggressive_opts_flags() {
1625 #ifdef COMPILER2
1626 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1627 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1628 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1629 }
1630 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1631 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1632 }
1634 // Feed the cache size setting into the JDK
1635 char buffer[1024];
1636 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1637 add_property(buffer);
1638 }
1639 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1640 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1641 }
1642 #endif
1644 if (AggressiveOpts) {
1645 // Sample flag setting code
1646 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1647 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1648 // }
1649 }
1650 }
1652 //===========================================================================================================
1653 // Parsing of java.compiler property
1655 void Arguments::process_java_compiler_argument(char* arg) {
1656 // For backwards compatibility, Djava.compiler=NONE or ""
1657 // causes us to switch to -Xint mode UNLESS -Xdebug
1658 // is also specified.
1659 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1660 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1661 }
1662 }
1664 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1665 _sun_java_launcher = strdup(launcher);
1666 if (strcmp("gamma", _sun_java_launcher) == 0) {
1667 _created_by_gamma_launcher = true;
1668 }
1669 }
1671 bool Arguments::created_by_java_launcher() {
1672 assert(_sun_java_launcher != NULL, "property must have value");
1673 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1674 }
1676 bool Arguments::created_by_gamma_launcher() {
1677 return _created_by_gamma_launcher;
1678 }
1680 //===========================================================================================================
1681 // Parsing of main arguments
1683 bool Arguments::verify_interval(uintx val, uintx min,
1684 uintx max, const char* name) {
1685 // Returns true iff value is in the inclusive interval [min..max]
1686 // false, otherwise.
1687 if (val >= min && val <= max) {
1688 return true;
1689 }
1690 jio_fprintf(defaultStream::error_stream(),
1691 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1692 " and " UINTX_FORMAT "\n",
1693 name, val, min, max);
1694 return false;
1695 }
1697 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1698 // Returns true if given value is at least specified min threshold
1699 // false, otherwise.
1700 if (val >= min ) {
1701 return true;
1702 }
1703 jio_fprintf(defaultStream::error_stream(),
1704 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1705 name, val, min);
1706 return false;
1707 }
1709 bool Arguments::verify_percentage(uintx value, const char* name) {
1710 if (value <= 100) {
1711 return true;
1712 }
1713 jio_fprintf(defaultStream::error_stream(),
1714 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1715 name, value);
1716 return false;
1717 }
1719 static void force_serial_gc() {
1720 FLAG_SET_DEFAULT(UseSerialGC, true);
1721 FLAG_SET_DEFAULT(UseParNewGC, false);
1722 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1723 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1724 FLAG_SET_DEFAULT(UseParallelGC, false);
1725 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1726 FLAG_SET_DEFAULT(UseG1GC, false);
1727 }
1729 static bool verify_serial_gc_flags() {
1730 return (UseSerialGC &&
1731 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1732 UseParallelGC || UseParallelOldGC));
1733 }
1735 // check if do gclog rotation
1736 // +UseGCLogFileRotation is a must,
1737 // no gc log rotation when log file not supplied or
1738 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1739 void check_gclog_consistency() {
1740 if (UseGCLogFileRotation) {
1741 if ((Arguments::gc_log_filename() == NULL) ||
1742 (NumberOfGCLogFiles == 0) ||
1743 (GCLogFileSize == 0)) {
1744 jio_fprintf(defaultStream::output_stream(),
1745 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1746 "where num_of_file > 0 and num_of_size > 0\n"
1747 "GC log rotation is turned off\n");
1748 UseGCLogFileRotation = false;
1749 }
1750 }
1752 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1753 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1754 jio_fprintf(defaultStream::output_stream(),
1755 "GCLogFileSize changed to minimum 8K\n");
1756 }
1757 }
1759 // Check consistency of GC selection
1760 bool Arguments::check_gc_consistency() {
1761 check_gclog_consistency();
1762 bool status = true;
1763 // Ensure that the user has not selected conflicting sets
1764 // of collectors. [Note: this check is merely a user convenience;
1765 // collectors over-ride each other so that only a non-conflicting
1766 // set is selected; however what the user gets is not what they
1767 // may have expected from the combination they asked for. It's
1768 // better to reduce user confusion by not allowing them to
1769 // select conflicting combinations.
1770 uint i = 0;
1771 if (UseSerialGC) i++;
1772 if (UseConcMarkSweepGC || UseParNewGC) i++;
1773 if (UseParallelGC || UseParallelOldGC) i++;
1774 if (UseG1GC) i++;
1775 if (i > 1) {
1776 jio_fprintf(defaultStream::error_stream(),
1777 "Conflicting collector combinations in option list; "
1778 "please refer to the release notes for the combinations "
1779 "allowed\n");
1780 status = false;
1781 }
1783 return status;
1784 }
1786 void Arguments::check_deprecated_gcs() {
1787 if (UseConcMarkSweepGC && !UseParNewGC) {
1788 warning("Using the DefNew young collector with the CMS collector is deprecated "
1789 "and will likely be removed in a future release");
1790 }
1792 if (UseParNewGC && !UseConcMarkSweepGC) {
1793 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1794 // set up UseSerialGC properly, so that can't be used in the check here.
1795 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1796 "and will likely be removed in a future release");
1797 }
1799 if (CMSIncrementalMode) {
1800 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1801 }
1802 }
1804 // Check stack pages settings
1805 bool Arguments::check_stack_pages()
1806 {
1807 bool status = true;
1808 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1809 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1810 // greater stack shadow pages can't generate instruction to bang stack
1811 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1812 return status;
1813 }
1815 // Check the consistency of vm_init_args
1816 bool Arguments::check_vm_args_consistency() {
1817 // Method for adding checks for flag consistency.
1818 // The intent is to warn the user of all possible conflicts,
1819 // before returning an error.
1820 // Note: Needs platform-dependent factoring.
1821 bool status = true;
1823 #if ( (defined(COMPILER2) && defined(SPARC)))
1824 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1825 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1826 // x86. Normally, VM_Version_init must be called from init_globals in
1827 // init.cpp, which is called by the initial java thread *after* arguments
1828 // have been parsed. VM_Version_init gets called twice on sparc.
1829 extern void VM_Version_init();
1830 VM_Version_init();
1831 if (!VM_Version::has_v9()) {
1832 jio_fprintf(defaultStream::error_stream(),
1833 "V8 Machine detected, Server requires V9\n");
1834 status = false;
1835 }
1836 #endif /* COMPILER2 && SPARC */
1838 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1839 // builds so the cost of stack banging can be measured.
1840 #if (defined(PRODUCT) && defined(SOLARIS))
1841 if (!UseBoundThreads && !UseStackBanging) {
1842 jio_fprintf(defaultStream::error_stream(),
1843 "-UseStackBanging conflicts with -UseBoundThreads\n");
1845 status = false;
1846 }
1847 #endif
1849 if (TLABRefillWasteFraction == 0) {
1850 jio_fprintf(defaultStream::error_stream(),
1851 "TLABRefillWasteFraction should be a denominator, "
1852 "not " SIZE_FORMAT "\n",
1853 TLABRefillWasteFraction);
1854 status = false;
1855 }
1857 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1858 "AdaptiveSizePolicyWeight");
1859 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1860 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1861 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1863 // Divide by bucket size to prevent a large size from causing rollover when
1864 // calculating amount of memory needed to be allocated for the String table.
1865 status = status && verify_interval(StringTableSize, defaultStringTableSize,
1866 (max_uintx / StringTable::bucket_size()), "StringTable size");
1868 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1869 jio_fprintf(defaultStream::error_stream(),
1870 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1871 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1872 MinHeapFreeRatio, MaxHeapFreeRatio);
1873 status = false;
1874 }
1875 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1876 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1878 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1879 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1880 }
1882 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1883 // Settings to encourage splitting.
1884 if (!FLAG_IS_CMDLINE(NewRatio)) {
1885 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1886 }
1887 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1888 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1889 }
1890 }
1892 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1893 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1894 if (GCTimeLimit == 100) {
1895 // Turn off gc-overhead-limit-exceeded checks
1896 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1897 }
1899 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1901 status = status && check_gc_consistency();
1902 status = status && check_stack_pages();
1904 if (_has_alloc_profile) {
1905 if (UseParallelGC || UseParallelOldGC) {
1906 jio_fprintf(defaultStream::error_stream(),
1907 "error: invalid argument combination.\n"
1908 "Allocation profiling (-Xaprof) cannot be used together with "
1909 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1910 status = false;
1911 }
1912 if (UseConcMarkSweepGC) {
1913 jio_fprintf(defaultStream::error_stream(),
1914 "error: invalid argument combination.\n"
1915 "Allocation profiling (-Xaprof) cannot be used together with "
1916 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1917 status = false;
1918 }
1919 }
1921 if (CMSIncrementalMode) {
1922 if (!UseConcMarkSweepGC) {
1923 jio_fprintf(defaultStream::error_stream(),
1924 "error: invalid argument combination.\n"
1925 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1926 "selected in order\nto use CMSIncrementalMode.\n");
1927 status = false;
1928 } else {
1929 status = status && verify_percentage(CMSIncrementalDutyCycle,
1930 "CMSIncrementalDutyCycle");
1931 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1932 "CMSIncrementalDutyCycleMin");
1933 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1934 "CMSIncrementalSafetyFactor");
1935 status = status && verify_percentage(CMSIncrementalOffset,
1936 "CMSIncrementalOffset");
1937 status = status && verify_percentage(CMSExpAvgFactor,
1938 "CMSExpAvgFactor");
1939 // If it was not set on the command line, set
1940 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1941 if (CMSInitiatingOccupancyFraction < 0) {
1942 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1943 }
1944 }
1945 }
1947 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1948 // insists that we hold the requisite locks so that the iteration is
1949 // MT-safe. For the verification at start-up and shut-down, we don't
1950 // yet have a good way of acquiring and releasing these locks,
1951 // which are not visible at the CollectedHeap level. We want to
1952 // be able to acquire these locks and then do the iteration rather
1953 // than just disable the lock verification. This will be fixed under
1954 // bug 4788986.
1955 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1956 if (VerifyGCStartAt == 0) {
1957 warning("Heap verification at start-up disabled "
1958 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1959 VerifyGCStartAt = 1; // Disable verification at start-up
1960 }
1961 if (VerifyBeforeExit) {
1962 warning("Heap verification at shutdown disabled "
1963 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1964 VerifyBeforeExit = false; // Disable verification at shutdown
1965 }
1966 }
1968 // Note: only executed in non-PRODUCT mode
1969 if (!UseAsyncConcMarkSweepGC &&
1970 (ExplicitGCInvokesConcurrent ||
1971 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1972 jio_fprintf(defaultStream::error_stream(),
1973 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1974 " with -UseAsyncConcMarkSweepGC");
1975 status = false;
1976 }
1978 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
1980 #if INCLUDE_ALL_GCS
1981 if (UseG1GC) {
1982 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1983 "InitiatingHeapOccupancyPercent");
1984 status = status && verify_min_value(G1RefProcDrainInterval, 1,
1985 "G1RefProcDrainInterval");
1986 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
1987 "G1ConcMarkStepDurationMillis");
1988 }
1989 #endif // INCLUDE_ALL_GCS
1991 status = status && verify_interval(RefDiscoveryPolicy,
1992 ReferenceProcessor::DiscoveryPolicyMin,
1993 ReferenceProcessor::DiscoveryPolicyMax,
1994 "RefDiscoveryPolicy");
1996 // Limit the lower bound of this flag to 1 as it is used in a division
1997 // expression.
1998 status = status && verify_interval(TLABWasteTargetPercent,
1999 1, 100, "TLABWasteTargetPercent");
2001 status = status && verify_object_alignment();
2003 status = status && verify_min_value(ClassMetaspaceSize, 1*M,
2004 "ClassMetaspaceSize");
2006 status = status && verify_interval(MarkStackSizeMax,
2007 1, (max_jint - 1), "MarkStackSizeMax");
2009 #ifdef SPARC
2010 if (UseConcMarkSweepGC || UseG1GC) {
2011 // Issue a stern warning if the user has explicitly set
2012 // UseMemSetInBOT (it is known to cause issues), but allow
2013 // use for experimentation and debugging.
2014 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2015 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2016 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2017 " on sun4v; please understand that you are using at your own risk!");
2018 }
2019 }
2020 #endif // SPARC
2022 if (PrintNMTStatistics) {
2023 #if INCLUDE_NMT
2024 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2025 #endif // INCLUDE_NMT
2026 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2027 PrintNMTStatistics = false;
2028 #if INCLUDE_NMT
2029 }
2030 #endif
2031 }
2033 return status;
2034 }
2036 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2037 const char* option_type) {
2038 if (ignore) return false;
2040 const char* spacer = " ";
2041 if (option_type == NULL) {
2042 option_type = ++spacer; // Set both to the empty string.
2043 }
2045 if (os::obsolete_option(option)) {
2046 jio_fprintf(defaultStream::error_stream(),
2047 "Obsolete %s%soption: %s\n", option_type, spacer,
2048 option->optionString);
2049 return false;
2050 } else {
2051 jio_fprintf(defaultStream::error_stream(),
2052 "Unrecognized %s%soption: %s\n", option_type, spacer,
2053 option->optionString);
2054 return true;
2055 }
2056 }
2058 static const char* user_assertion_options[] = {
2059 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2060 };
2062 static const char* system_assertion_options[] = {
2063 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2064 };
2066 // Return true if any of the strings in null-terminated array 'names' matches.
2067 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2068 // the option must match exactly.
2069 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2070 bool tail_allowed) {
2071 for (/* empty */; *names != NULL; ++names) {
2072 if (match_option(option, *names, tail)) {
2073 if (**tail == '\0' || tail_allowed && **tail == ':') {
2074 return true;
2075 }
2076 }
2077 }
2078 return false;
2079 }
2081 bool Arguments::parse_uintx(const char* value,
2082 uintx* uintx_arg,
2083 uintx min_size) {
2085 // Check the sign first since atomull() parses only unsigned values.
2086 bool value_is_positive = !(*value == '-');
2088 if (value_is_positive) {
2089 julong n;
2090 bool good_return = atomull(value, &n);
2091 if (good_return) {
2092 bool above_minimum = n >= min_size;
2093 bool value_is_too_large = n > max_uintx;
2095 if (above_minimum && !value_is_too_large) {
2096 *uintx_arg = n;
2097 return true;
2098 }
2099 }
2100 }
2101 return false;
2102 }
2104 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2105 julong* long_arg,
2106 julong min_size) {
2107 if (!atomull(s, long_arg)) return arg_unreadable;
2108 return check_memory_size(*long_arg, min_size);
2109 }
2111 // Parse JavaVMInitArgs structure
2113 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2114 // For components of the system classpath.
2115 SysClassPath scp(Arguments::get_sysclasspath());
2116 bool scp_assembly_required = false;
2118 // Save default settings for some mode flags
2119 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2120 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2121 Arguments::_ClipInlining = ClipInlining;
2122 Arguments::_BackgroundCompilation = BackgroundCompilation;
2124 // Setup flags for mixed which is the default
2125 set_mode_flags(_mixed);
2127 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2128 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2129 if (result != JNI_OK) {
2130 return result;
2131 }
2133 // Parse JavaVMInitArgs structure passed in
2134 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2135 if (result != JNI_OK) {
2136 return result;
2137 }
2139 if (AggressiveOpts) {
2140 // Insert alt-rt.jar between user-specified bootclasspath
2141 // prefix and the default bootclasspath. os::set_boot_path()
2142 // uses meta_index_dir as the default bootclasspath directory.
2143 const char* altclasses_jar = "alt-rt.jar";
2144 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2145 strlen(altclasses_jar);
2146 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2147 strcpy(altclasses_path, get_meta_index_dir());
2148 strcat(altclasses_path, altclasses_jar);
2149 scp.add_suffix_to_prefix(altclasses_path);
2150 scp_assembly_required = true;
2151 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2152 }
2154 if (WhiteBoxAPI) {
2155 // Append wb.jar to bootclasspath if enabled
2156 const char* wb_jar = "wb.jar";
2157 size_t wb_path_len = strlen(get_meta_index_dir()) + 1 +
2158 strlen(wb_jar);
2159 char* wb_path = NEW_C_HEAP_ARRAY(char, wb_path_len, mtInternal);
2160 strcpy(wb_path, get_meta_index_dir());
2161 strcat(wb_path, wb_jar);
2162 scp.add_suffix(wb_path);
2163 scp_assembly_required = true;
2164 FREE_C_HEAP_ARRAY(char, wb_path, mtInternal);
2165 }
2167 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2168 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2169 if (result != JNI_OK) {
2170 return result;
2171 }
2173 // Do final processing now that all arguments have been parsed
2174 result = finalize_vm_init_args(&scp, scp_assembly_required);
2175 if (result != JNI_OK) {
2176 return result;
2177 }
2179 return JNI_OK;
2180 }
2182 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2183 SysClassPath* scp_p,
2184 bool* scp_assembly_required_p,
2185 FlagValueOrigin origin) {
2186 // Remaining part of option string
2187 const char* tail;
2189 // iterate over arguments
2190 for (int index = 0; index < args->nOptions; index++) {
2191 bool is_absolute_path = false; // for -agentpath vs -agentlib
2193 const JavaVMOption* option = args->options + index;
2195 if (!match_option(option, "-Djava.class.path", &tail) &&
2196 !match_option(option, "-Dsun.java.command", &tail) &&
2197 !match_option(option, "-Dsun.java.launcher", &tail)) {
2199 // add all jvm options to the jvm_args string. This string
2200 // is used later to set the java.vm.args PerfData string constant.
2201 // the -Djava.class.path and the -Dsun.java.command options are
2202 // omitted from jvm_args string as each have their own PerfData
2203 // string constant object.
2204 build_jvm_args(option->optionString);
2205 }
2207 // -verbose:[class/gc/jni]
2208 if (match_option(option, "-verbose", &tail)) {
2209 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2210 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2211 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2212 } else if (!strcmp(tail, ":gc")) {
2213 FLAG_SET_CMDLINE(bool, PrintGC, true);
2214 } else if (!strcmp(tail, ":jni")) {
2215 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2216 }
2217 // -da / -ea / -disableassertions / -enableassertions
2218 // These accept an optional class/package name separated by a colon, e.g.,
2219 // -da:java.lang.Thread.
2220 } else if (match_option(option, user_assertion_options, &tail, true)) {
2221 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2222 if (*tail == '\0') {
2223 JavaAssertions::setUserClassDefault(enable);
2224 } else {
2225 assert(*tail == ':', "bogus match by match_option()");
2226 JavaAssertions::addOption(tail + 1, enable);
2227 }
2228 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2229 } else if (match_option(option, system_assertion_options, &tail, false)) {
2230 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2231 JavaAssertions::setSystemClassDefault(enable);
2232 // -bootclasspath:
2233 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2234 scp_p->reset_path(tail);
2235 *scp_assembly_required_p = true;
2236 // -bootclasspath/a:
2237 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2238 scp_p->add_suffix(tail);
2239 *scp_assembly_required_p = true;
2240 // -bootclasspath/p:
2241 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2242 scp_p->add_prefix(tail);
2243 *scp_assembly_required_p = true;
2244 // -Xrun
2245 } else if (match_option(option, "-Xrun", &tail)) {
2246 if (tail != NULL) {
2247 const char* pos = strchr(tail, ':');
2248 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2249 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2250 name[len] = '\0';
2252 char *options = NULL;
2253 if(pos != NULL) {
2254 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2255 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2256 }
2257 #if !INCLUDE_JVMTI
2258 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2259 warning("profiling and debugging agents are not supported in this VM");
2260 } else
2261 #endif // !INCLUDE_JVMTI
2262 add_init_library(name, options);
2263 }
2264 // -agentlib and -agentpath
2265 } else if (match_option(option, "-agentlib:", &tail) ||
2266 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2267 if(tail != NULL) {
2268 const char* pos = strchr(tail, '=');
2269 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2270 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2271 name[len] = '\0';
2273 char *options = NULL;
2274 if(pos != NULL) {
2275 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2276 }
2277 #if !INCLUDE_JVMTI
2278 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2279 warning("profiling and debugging agents are not supported in this VM");
2280 } else
2281 #endif // !INCLUDE_JVMTI
2282 add_init_agent(name, options, is_absolute_path);
2284 }
2285 // -javaagent
2286 } else if (match_option(option, "-javaagent:", &tail)) {
2287 #if !INCLUDE_JVMTI
2288 warning("Instrumentation agents are not supported in this VM");
2289 #else
2290 if(tail != NULL) {
2291 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2292 add_init_agent("instrument", options, false);
2293 }
2294 #endif // !INCLUDE_JVMTI
2295 // -Xnoclassgc
2296 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2297 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2298 // -Xincgc: i-CMS
2299 } else if (match_option(option, "-Xincgc", &tail)) {
2300 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2301 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2302 // -Xnoincgc: no i-CMS
2303 } else if (match_option(option, "-Xnoincgc", &tail)) {
2304 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2305 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2306 // -Xconcgc
2307 } else if (match_option(option, "-Xconcgc", &tail)) {
2308 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2309 // -Xnoconcgc
2310 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2311 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2312 // -Xbatch
2313 } else if (match_option(option, "-Xbatch", &tail)) {
2314 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2315 // -Xmn for compatibility with other JVM vendors
2316 } else if (match_option(option, "-Xmn", &tail)) {
2317 julong long_initial_eden_size = 0;
2318 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2319 if (errcode != arg_in_range) {
2320 jio_fprintf(defaultStream::error_stream(),
2321 "Invalid initial eden size: %s\n", option->optionString);
2322 describe_range_error(errcode);
2323 return JNI_EINVAL;
2324 }
2325 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2326 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2327 // -Xms
2328 } else if (match_option(option, "-Xms", &tail)) {
2329 julong long_initial_heap_size = 0;
2330 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2331 if (errcode != arg_in_range) {
2332 jio_fprintf(defaultStream::error_stream(),
2333 "Invalid initial heap size: %s\n", option->optionString);
2334 describe_range_error(errcode);
2335 return JNI_EINVAL;
2336 }
2337 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2338 // Currently the minimum size and the initial heap sizes are the same.
2339 set_min_heap_size(InitialHeapSize);
2340 // -Xmx
2341 } else if (match_option(option, "-Xmx", &tail)) {
2342 julong long_max_heap_size = 0;
2343 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2344 if (errcode != arg_in_range) {
2345 jio_fprintf(defaultStream::error_stream(),
2346 "Invalid maximum heap size: %s\n", option->optionString);
2347 describe_range_error(errcode);
2348 return JNI_EINVAL;
2349 }
2350 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2351 // Xmaxf
2352 } else if (match_option(option, "-Xmaxf", &tail)) {
2353 int maxf = (int)(atof(tail) * 100);
2354 if (maxf < 0 || maxf > 100) {
2355 jio_fprintf(defaultStream::error_stream(),
2356 "Bad max heap free percentage size: %s\n",
2357 option->optionString);
2358 return JNI_EINVAL;
2359 } else {
2360 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2361 }
2362 // Xminf
2363 } else if (match_option(option, "-Xminf", &tail)) {
2364 int minf = (int)(atof(tail) * 100);
2365 if (minf < 0 || minf > 100) {
2366 jio_fprintf(defaultStream::error_stream(),
2367 "Bad min heap free percentage size: %s\n",
2368 option->optionString);
2369 return JNI_EINVAL;
2370 } else {
2371 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2372 }
2373 // -Xss
2374 } else if (match_option(option, "-Xss", &tail)) {
2375 julong long_ThreadStackSize = 0;
2376 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2377 if (errcode != arg_in_range) {
2378 jio_fprintf(defaultStream::error_stream(),
2379 "Invalid thread stack size: %s\n", option->optionString);
2380 describe_range_error(errcode);
2381 return JNI_EINVAL;
2382 }
2383 // Internally track ThreadStackSize in units of 1024 bytes.
2384 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2385 round_to((int)long_ThreadStackSize, K) / K);
2386 // -Xoss
2387 } else if (match_option(option, "-Xoss", &tail)) {
2388 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2389 // -Xmaxjitcodesize
2390 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2391 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2392 julong long_ReservedCodeCacheSize = 0;
2393 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2394 (size_t)InitialCodeCacheSize);
2395 if (errcode != arg_in_range) {
2396 jio_fprintf(defaultStream::error_stream(),
2397 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2398 option->optionString, InitialCodeCacheSize/K);
2399 describe_range_error(errcode);
2400 return JNI_EINVAL;
2401 }
2402 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2403 // -green
2404 } else if (match_option(option, "-green", &tail)) {
2405 jio_fprintf(defaultStream::error_stream(),
2406 "Green threads support not available\n");
2407 return JNI_EINVAL;
2408 // -native
2409 } else if (match_option(option, "-native", &tail)) {
2410 // HotSpot always uses native threads, ignore silently for compatibility
2411 // -Xsqnopause
2412 } else if (match_option(option, "-Xsqnopause", &tail)) {
2413 // EVM option, ignore silently for compatibility
2414 // -Xrs
2415 } else if (match_option(option, "-Xrs", &tail)) {
2416 // Classic/EVM option, new functionality
2417 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2418 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2419 // change default internal VM signals used - lower case for back compat
2420 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2421 // -Xoptimize
2422 } else if (match_option(option, "-Xoptimize", &tail)) {
2423 // EVM option, ignore silently for compatibility
2424 // -Xprof
2425 } else if (match_option(option, "-Xprof", &tail)) {
2426 #if INCLUDE_FPROF
2427 _has_profile = true;
2428 #else // INCLUDE_FPROF
2429 // do we have to exit?
2430 warning("Flat profiling is not supported in this VM.");
2431 #endif // INCLUDE_FPROF
2432 // -Xaprof
2433 } else if (match_option(option, "-Xaprof", &tail)) {
2434 _has_alloc_profile = true;
2435 // -Xconcurrentio
2436 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2437 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2438 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2439 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2440 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2441 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2443 // -Xinternalversion
2444 } else if (match_option(option, "-Xinternalversion", &tail)) {
2445 jio_fprintf(defaultStream::output_stream(), "%s\n",
2446 VM_Version::internal_vm_info_string());
2447 vm_exit(0);
2448 #ifndef PRODUCT
2449 // -Xprintflags
2450 } else if (match_option(option, "-Xprintflags", &tail)) {
2451 CommandLineFlags::printFlags(tty, false);
2452 vm_exit(0);
2453 #endif
2454 // -D
2455 } else if (match_option(option, "-D", &tail)) {
2456 if (!add_property(tail)) {
2457 return JNI_ENOMEM;
2458 }
2459 // Out of the box management support
2460 if (match_option(option, "-Dcom.sun.management", &tail)) {
2461 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2462 }
2463 // -Xint
2464 } else if (match_option(option, "-Xint", &tail)) {
2465 set_mode_flags(_int);
2466 // -Xmixed
2467 } else if (match_option(option, "-Xmixed", &tail)) {
2468 set_mode_flags(_mixed);
2469 // -Xcomp
2470 } else if (match_option(option, "-Xcomp", &tail)) {
2471 // for testing the compiler; turn off all flags that inhibit compilation
2472 set_mode_flags(_comp);
2474 // -Xshare:dump
2475 } else if (match_option(option, "-Xshare:dump", &tail)) {
2476 #if defined(KERNEL)
2477 vm_exit_during_initialization(
2478 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2479 #elif !INCLUDE_CDS
2480 vm_exit_during_initialization(
2481 "Dumping a shared archive is not supported in this VM.", NULL);
2482 #else
2483 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2484 set_mode_flags(_int); // Prevent compilation, which creates objects
2485 #endif
2486 // -Xshare:on
2487 } else if (match_option(option, "-Xshare:on", &tail)) {
2488 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2489 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2490 // -Xshare:auto
2491 } else if (match_option(option, "-Xshare:auto", &tail)) {
2492 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2493 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2494 // -Xshare:off
2495 } else if (match_option(option, "-Xshare:off", &tail)) {
2496 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2497 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2499 // -Xverify
2500 } else if (match_option(option, "-Xverify", &tail)) {
2501 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2502 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2503 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2504 } else if (strcmp(tail, ":remote") == 0) {
2505 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2506 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2507 } else if (strcmp(tail, ":none") == 0) {
2508 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2509 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2510 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2511 return JNI_EINVAL;
2512 }
2513 // -Xdebug
2514 } else if (match_option(option, "-Xdebug", &tail)) {
2515 // note this flag has been used, then ignore
2516 set_xdebug_mode(true);
2517 // -Xnoagent
2518 } else if (match_option(option, "-Xnoagent", &tail)) {
2519 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2520 } else if (match_option(option, "-Xboundthreads", &tail)) {
2521 // Bind user level threads to kernel threads (Solaris only)
2522 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2523 } else if (match_option(option, "-Xloggc:", &tail)) {
2524 // Redirect GC output to the file. -Xloggc:<filename>
2525 // ostream_init_log(), when called will use this filename
2526 // to initialize a fileStream.
2527 _gc_log_filename = strdup(tail);
2528 FLAG_SET_CMDLINE(bool, PrintGC, true);
2529 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2531 // JNI hooks
2532 } else if (match_option(option, "-Xcheck", &tail)) {
2533 if (!strcmp(tail, ":jni")) {
2534 #if !INCLUDE_JNI_CHECK
2535 warning("JNI CHECKING is not supported in this VM");
2536 #else
2537 CheckJNICalls = true;
2538 #endif // INCLUDE_JNI_CHECK
2539 } else if (is_bad_option(option, args->ignoreUnrecognized,
2540 "check")) {
2541 return JNI_EINVAL;
2542 }
2543 } else if (match_option(option, "vfprintf", &tail)) {
2544 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2545 } else if (match_option(option, "exit", &tail)) {
2546 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2547 } else if (match_option(option, "abort", &tail)) {
2548 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2549 // -XX:+AggressiveHeap
2550 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2552 // This option inspects the machine and attempts to set various
2553 // parameters to be optimal for long-running, memory allocation
2554 // intensive jobs. It is intended for machines with large
2555 // amounts of cpu and memory.
2557 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2558 // VM, but we may not be able to represent the total physical memory
2559 // available (like having 8gb of memory on a box but using a 32bit VM).
2560 // Thus, we need to make sure we're using a julong for intermediate
2561 // calculations.
2562 julong initHeapSize;
2563 julong total_memory = os::physical_memory();
2565 if (total_memory < (julong)256*M) {
2566 jio_fprintf(defaultStream::error_stream(),
2567 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2568 vm_exit(1);
2569 }
2571 // The heap size is half of available memory, or (at most)
2572 // all of possible memory less 160mb (leaving room for the OS
2573 // when using ISM). This is the maximum; because adaptive sizing
2574 // is turned on below, the actual space used may be smaller.
2576 initHeapSize = MIN2(total_memory / (julong)2,
2577 total_memory - (julong)160*M);
2579 // Make sure that if we have a lot of memory we cap the 32 bit
2580 // process space. The 64bit VM version of this function is a nop.
2581 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2583 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2584 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2585 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2586 // Currently the minimum size and the initial heap sizes are the same.
2587 set_min_heap_size(initHeapSize);
2588 }
2589 if (FLAG_IS_DEFAULT(NewSize)) {
2590 // Make the young generation 3/8ths of the total heap.
2591 FLAG_SET_CMDLINE(uintx, NewSize,
2592 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2593 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2594 }
2596 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2597 FLAG_SET_DEFAULT(UseLargePages, true);
2598 #endif
2600 // Increase some data structure sizes for efficiency
2601 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2602 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2603 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2605 // See the OldPLABSize comment below, but replace 'after promotion'
2606 // with 'after copying'. YoungPLABSize is the size of the survivor
2607 // space per-gc-thread buffers. The default is 4kw.
2608 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2610 // OldPLABSize is the size of the buffers in the old gen that
2611 // UseParallelGC uses to promote live data that doesn't fit in the
2612 // survivor spaces. At any given time, there's one for each gc thread.
2613 // The default size is 1kw. These buffers are rarely used, since the
2614 // survivor spaces are usually big enough. For specjbb, however, there
2615 // are occasions when there's lots of live data in the young gen
2616 // and we end up promoting some of it. We don't have a definite
2617 // explanation for why bumping OldPLABSize helps, but the theory
2618 // is that a bigger PLAB results in retaining something like the
2619 // original allocation order after promotion, which improves mutator
2620 // locality. A minor effect may be that larger PLABs reduce the
2621 // number of PLAB allocation events during gc. The value of 8kw
2622 // was arrived at by experimenting with specjbb.
2623 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2625 // Enable parallel GC and adaptive generation sizing
2626 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2627 FLAG_SET_DEFAULT(ParallelGCThreads,
2628 Abstract_VM_Version::parallel_worker_threads());
2630 // Encourage steady state memory management
2631 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2633 // This appears to improve mutator locality
2634 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2636 // Get around early Solaris scheduling bug
2637 // (affinity vs other jobs on system)
2638 // but disallow DR and offlining (5008695).
2639 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2641 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2642 // The last option must always win.
2643 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2644 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2645 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2646 // The last option must always win.
2647 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2648 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2649 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2650 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2651 jio_fprintf(defaultStream::error_stream(),
2652 "Please use CMSClassUnloadingEnabled in place of "
2653 "CMSPermGenSweepingEnabled in the future\n");
2654 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2655 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2656 jio_fprintf(defaultStream::error_stream(),
2657 "Please use -XX:+UseGCOverheadLimit in place of "
2658 "-XX:+UseGCTimeLimit in the future\n");
2659 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2660 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2661 jio_fprintf(defaultStream::error_stream(),
2662 "Please use -XX:-UseGCOverheadLimit in place of "
2663 "-XX:-UseGCTimeLimit in the future\n");
2664 // The TLE options are for compatibility with 1.3 and will be
2665 // removed without notice in a future release. These options
2666 // are not to be documented.
2667 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2668 // No longer used.
2669 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2670 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2671 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2672 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2673 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2674 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2675 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2676 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2677 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2678 // No longer used.
2679 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2680 julong long_tlab_size = 0;
2681 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2682 if (errcode != arg_in_range) {
2683 jio_fprintf(defaultStream::error_stream(),
2684 "Invalid TLAB size: %s\n", option->optionString);
2685 describe_range_error(errcode);
2686 return JNI_EINVAL;
2687 }
2688 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2689 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2690 // No longer used.
2691 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2692 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2693 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2694 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2695 SOLARIS_ONLY(
2696 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2697 warning("-XX:+UsePermISM is obsolete.");
2698 FLAG_SET_CMDLINE(bool, UseISM, true);
2699 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2700 FLAG_SET_CMDLINE(bool, UseISM, false);
2701 )
2702 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2703 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2704 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2705 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2706 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2707 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2708 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2709 #if defined(DTRACE_ENABLED)
2710 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2711 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2712 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2713 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2714 #else // defined(DTRACE_ENABLED)
2715 jio_fprintf(defaultStream::error_stream(),
2716 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2717 return JNI_EINVAL;
2718 #endif // defined(DTRACE_ENABLED)
2719 #ifdef ASSERT
2720 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2721 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2722 // disable scavenge before parallel mark-compact
2723 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2724 #endif
2725 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2726 julong cms_blocks_to_claim = (julong)atol(tail);
2727 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2728 jio_fprintf(defaultStream::error_stream(),
2729 "Please use -XX:OldPLABSize in place of "
2730 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2731 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2732 julong cms_blocks_to_claim = (julong)atol(tail);
2733 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2734 jio_fprintf(defaultStream::error_stream(),
2735 "Please use -XX:OldPLABSize in place of "
2736 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2737 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2738 julong old_plab_size = 0;
2739 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2740 if (errcode != arg_in_range) {
2741 jio_fprintf(defaultStream::error_stream(),
2742 "Invalid old PLAB size: %s\n", option->optionString);
2743 describe_range_error(errcode);
2744 return JNI_EINVAL;
2745 }
2746 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2747 jio_fprintf(defaultStream::error_stream(),
2748 "Please use -XX:OldPLABSize in place of "
2749 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2750 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2751 julong young_plab_size = 0;
2752 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2753 if (errcode != arg_in_range) {
2754 jio_fprintf(defaultStream::error_stream(),
2755 "Invalid young PLAB size: %s\n", option->optionString);
2756 describe_range_error(errcode);
2757 return JNI_EINVAL;
2758 }
2759 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2760 jio_fprintf(defaultStream::error_stream(),
2761 "Please use -XX:YoungPLABSize in place of "
2762 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2763 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2764 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2765 julong stack_size = 0;
2766 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2767 if (errcode != arg_in_range) {
2768 jio_fprintf(defaultStream::error_stream(),
2769 "Invalid mark stack size: %s\n", option->optionString);
2770 describe_range_error(errcode);
2771 return JNI_EINVAL;
2772 }
2773 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2774 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2775 julong max_stack_size = 0;
2776 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2777 if (errcode != arg_in_range) {
2778 jio_fprintf(defaultStream::error_stream(),
2779 "Invalid maximum mark stack size: %s\n",
2780 option->optionString);
2781 describe_range_error(errcode);
2782 return JNI_EINVAL;
2783 }
2784 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2785 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2786 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2787 uintx conc_threads = 0;
2788 if (!parse_uintx(tail, &conc_threads, 1)) {
2789 jio_fprintf(defaultStream::error_stream(),
2790 "Invalid concurrent threads: %s\n", option->optionString);
2791 return JNI_EINVAL;
2792 }
2793 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2794 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
2795 julong max_direct_memory_size = 0;
2796 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
2797 if (errcode != arg_in_range) {
2798 jio_fprintf(defaultStream::error_stream(),
2799 "Invalid maximum direct memory size: %s\n",
2800 option->optionString);
2801 describe_range_error(errcode);
2802 return JNI_EINVAL;
2803 }
2804 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
2805 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
2806 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
2807 // away and will cause VM initialization failures!
2808 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
2809 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
2810 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2811 // Skip -XX:Flags= since that case has already been handled
2812 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2813 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2814 return JNI_EINVAL;
2815 }
2816 }
2817 // Unknown option
2818 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2819 return JNI_ERR;
2820 }
2821 }
2823 // Change the default value for flags which have different default values
2824 // when working with older JDKs.
2825 #ifdef LINUX
2826 if (JDK_Version::current().compare_major(6) <= 0 &&
2827 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2828 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2829 }
2830 #endif // LINUX
2831 return JNI_OK;
2832 }
2834 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2835 // This must be done after all -D arguments have been processed.
2836 scp_p->expand_endorsed();
2838 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2839 // Assemble the bootclasspath elements into the final path.
2840 Arguments::set_sysclasspath(scp_p->combined_path());
2841 }
2843 // This must be done after all arguments have been processed.
2844 // java_compiler() true means set to "NONE" or empty.
2845 if (java_compiler() && !xdebug_mode()) {
2846 // For backwards compatibility, we switch to interpreted mode if
2847 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2848 // not specified.
2849 set_mode_flags(_int);
2850 }
2851 if (CompileThreshold == 0) {
2852 set_mode_flags(_int);
2853 }
2855 #ifndef COMPILER2
2856 // Don't degrade server performance for footprint
2857 if (FLAG_IS_DEFAULT(UseLargePages) &&
2858 MaxHeapSize < LargePageHeapSizeThreshold) {
2859 // No need for large granularity pages w/small heaps.
2860 // Note that large pages are enabled/disabled for both the
2861 // Java heap and the code cache.
2862 FLAG_SET_DEFAULT(UseLargePages, false);
2863 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2864 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2865 }
2867 // Tiered compilation is undefined with C1.
2868 TieredCompilation = false;
2869 #else
2870 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2871 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2872 }
2873 #endif
2875 // If we are running in a headless jre, force java.awt.headless property
2876 // to be true unless the property has already been set.
2877 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2878 if (os::is_headless_jre()) {
2879 const char* headless = Arguments::get_property("java.awt.headless");
2880 if (headless == NULL) {
2881 char envbuffer[128];
2882 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2883 if (!add_property("java.awt.headless=true")) {
2884 return JNI_ENOMEM;
2885 }
2886 } else {
2887 char buffer[256];
2888 strcpy(buffer, "java.awt.headless=");
2889 strcat(buffer, envbuffer);
2890 if (!add_property(buffer)) {
2891 return JNI_ENOMEM;
2892 }
2893 }
2894 }
2895 }
2897 if (!check_vm_args_consistency()) {
2898 return JNI_ERR;
2899 }
2901 return JNI_OK;
2902 }
2904 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2905 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2906 scp_assembly_required_p);
2907 }
2909 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2910 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2911 scp_assembly_required_p);
2912 }
2914 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2915 const int N_MAX_OPTIONS = 64;
2916 const int OPTION_BUFFER_SIZE = 1024;
2917 char buffer[OPTION_BUFFER_SIZE];
2919 // The variable will be ignored if it exceeds the length of the buffer.
2920 // Don't check this variable if user has special privileges
2921 // (e.g. unix su command).
2922 if (os::getenv(name, buffer, sizeof(buffer)) &&
2923 !os::have_special_privileges()) {
2924 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2925 jio_fprintf(defaultStream::error_stream(),
2926 "Picked up %s: %s\n", name, buffer);
2927 char* rd = buffer; // pointer to the input string (rd)
2928 int i;
2929 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2930 while (isspace(*rd)) rd++; // skip whitespace
2931 if (*rd == 0) break; // we re done when the input string is read completely
2933 // The output, option string, overwrites the input string.
2934 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2935 // input string (rd).
2936 char* wrt = rd;
2938 options[i++].optionString = wrt; // Fill in option
2939 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2940 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2941 int quote = *rd; // matching quote to look for
2942 rd++; // don't copy open quote
2943 while (*rd != quote) { // include everything (even spaces) up until quote
2944 if (*rd == 0) { // string termination means unmatched string
2945 jio_fprintf(defaultStream::error_stream(),
2946 "Unmatched quote in %s\n", name);
2947 return JNI_ERR;
2948 }
2949 *wrt++ = *rd++; // copy to option string
2950 }
2951 rd++; // don't copy close quote
2952 } else {
2953 *wrt++ = *rd++; // copy to option string
2954 }
2955 }
2956 // Need to check if we're done before writing a NULL,
2957 // because the write could be to the byte that rd is pointing to.
2958 if (*rd++ == 0) {
2959 *wrt = 0;
2960 break;
2961 }
2962 *wrt = 0; // Zero terminate option
2963 }
2964 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2965 JavaVMInitArgs vm_args;
2966 vm_args.version = JNI_VERSION_1_2;
2967 vm_args.options = options;
2968 vm_args.nOptions = i;
2969 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2971 if (PrintVMOptions) {
2972 const char* tail;
2973 for (int i = 0; i < vm_args.nOptions; i++) {
2974 const JavaVMOption *option = vm_args.options + i;
2975 if (match_option(option, "-XX:", &tail)) {
2976 logOption(tail);
2977 }
2978 }
2979 }
2981 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2982 }
2983 return JNI_OK;
2984 }
2986 void Arguments::set_shared_spaces_flags() {
2987 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
2988 const bool might_share = must_share || UseSharedSpaces;
2990 // CompressedOops cannot be used with CDS. The offsets of oopmaps and
2991 // static fields are incorrect in the archive. With some more clever
2992 // initialization, this restriction can probably be lifted.
2993 // ??? UseLargePages might be okay now
2994 const bool cannot_share = UseCompressedOops ||
2995 (UseLargePages && FLAG_IS_CMDLINE(UseLargePages));
2996 if (cannot_share) {
2997 if (must_share) {
2998 warning("disabling large pages %s"
2999 "because of %s", "" LP64_ONLY("and compressed oops "),
3000 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
3001 FLAG_SET_CMDLINE(bool, UseLargePages, false);
3002 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
3003 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false));
3004 } else {
3005 // Prefer compressed oops and large pages to class data sharing
3006 if (UseSharedSpaces && Verbose) {
3007 warning("turning off use of shared archive because of large pages%s",
3008 "" LP64_ONLY(" and/or compressed oops"));
3009 }
3010 no_shared_spaces();
3011 }
3012 } else if (UseLargePages && might_share) {
3013 // Disable large pages to allow shared spaces. This is sub-optimal, since
3014 // there may not even be a shared archive to use.
3015 FLAG_SET_DEFAULT(UseLargePages, false);
3016 }
3018 if (DumpSharedSpaces) {
3019 if (RequireSharedSpaces) {
3020 warning("cannot dump shared archive while using shared archive");
3021 }
3022 UseSharedSpaces = false;
3023 }
3024 }
3026 // Disable options not supported in this release, with a warning if they
3027 // were explicitly requested on the command-line
3028 #define UNSUPPORTED_OPTION(opt, description) \
3029 do { \
3030 if (opt) { \
3031 if (FLAG_IS_CMDLINE(opt)) { \
3032 warning(description " is disabled in this release."); \
3033 } \
3034 FLAG_SET_DEFAULT(opt, false); \
3035 } \
3036 } while(0)
3038 // Parse entry point called from JNI_CreateJavaVM
3040 jint Arguments::parse(const JavaVMInitArgs* args) {
3042 // Sharing support
3043 // Construct the path to the archive
3044 char jvm_path[JVM_MAXPATHLEN];
3045 os::jvm_path(jvm_path, sizeof(jvm_path));
3046 char *end = strrchr(jvm_path, *os::file_separator());
3047 if (end != NULL) *end = '\0';
3048 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
3049 strlen(os::file_separator()) + 20, mtInternal);
3050 if (shared_archive_path == NULL) return JNI_ENOMEM;
3051 strcpy(shared_archive_path, jvm_path);
3052 strcat(shared_archive_path, os::file_separator());
3053 strcat(shared_archive_path, "classes");
3054 strcat(shared_archive_path, ".jsa");
3055 SharedArchivePath = shared_archive_path;
3057 // Remaining part of option string
3058 const char* tail;
3060 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3061 const char* hotspotrc = ".hotspotrc";
3062 bool settings_file_specified = false;
3063 bool needs_hotspotrc_warning = false;
3065 const char* flags_file;
3066 int index;
3067 for (index = 0; index < args->nOptions; index++) {
3068 const JavaVMOption *option = args->options + index;
3069 if (match_option(option, "-XX:Flags=", &tail)) {
3070 flags_file = tail;
3071 settings_file_specified = true;
3072 }
3073 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3074 PrintVMOptions = true;
3075 }
3076 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3077 PrintVMOptions = false;
3078 }
3079 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3080 IgnoreUnrecognizedVMOptions = true;
3081 }
3082 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3083 IgnoreUnrecognizedVMOptions = false;
3084 }
3085 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3086 CommandLineFlags::printFlags(tty, false);
3087 vm_exit(0);
3088 }
3089 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3090 #if INCLUDE_NMT
3091 MemTracker::init_tracking_options(tail);
3092 #else
3093 warning("Native Memory Tracking is not supported in this VM");
3094 #endif
3095 }
3098 #ifndef PRODUCT
3099 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3100 CommandLineFlags::printFlags(tty, true);
3101 vm_exit(0);
3102 }
3103 #endif
3104 }
3106 if (IgnoreUnrecognizedVMOptions) {
3107 // uncast const to modify the flag args->ignoreUnrecognized
3108 *(jboolean*)(&args->ignoreUnrecognized) = true;
3109 }
3111 // Parse specified settings file
3112 if (settings_file_specified) {
3113 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3114 return JNI_EINVAL;
3115 }
3116 } else {
3117 #ifdef ASSERT
3118 // Parse default .hotspotrc settings file
3119 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3120 return JNI_EINVAL;
3121 }
3122 #else
3123 struct stat buf;
3124 if (os::stat(hotspotrc, &buf) == 0) {
3125 needs_hotspotrc_warning = true;
3126 }
3127 #endif
3128 }
3130 if (PrintVMOptions) {
3131 for (index = 0; index < args->nOptions; index++) {
3132 const JavaVMOption *option = args->options + index;
3133 if (match_option(option, "-XX:", &tail)) {
3134 logOption(tail);
3135 }
3136 }
3137 }
3139 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3140 jint result = parse_vm_init_args(args);
3141 if (result != JNI_OK) {
3142 return result;
3143 }
3145 // Delay warning until here so that we've had a chance to process
3146 // the -XX:-PrintWarnings flag
3147 if (needs_hotspotrc_warning) {
3148 warning("%s file is present but has been ignored. "
3149 "Run with -XX:Flags=%s to load the file.",
3150 hotspotrc, hotspotrc);
3151 }
3153 #if (defined JAVASE_EMBEDDED || defined ARM)
3154 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3155 #endif
3157 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3158 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3159 #endif
3161 #if !INCLUDE_ALL_GCS
3162 if (UseParallelGC) {
3163 warning("Parallel GC is not supported in this VM. Using Serial GC.");
3164 }
3165 if (UseParallelOldGC) {
3166 warning("Parallel Old GC is not supported in this VM. Using Serial GC.");
3167 }
3168 if (UseConcMarkSweepGC) {
3169 warning("Concurrent Mark Sweep GC is not supported in this VM. Using Serial GC.");
3170 }
3171 if (UseParNewGC) {
3172 warning("Par New GC is not supported in this VM. Using Serial GC.");
3173 }
3174 #endif // INCLUDE_ALL_GCS
3176 #ifndef PRODUCT
3177 if (TraceBytecodesAt != 0) {
3178 TraceBytecodes = true;
3179 }
3180 if (CountCompiledCalls) {
3181 if (UseCounterDecay) {
3182 warning("UseCounterDecay disabled because CountCalls is set");
3183 UseCounterDecay = false;
3184 }
3185 }
3186 #endif // PRODUCT
3188 // JSR 292 is not supported before 1.7
3189 if (!JDK_Version::is_gte_jdk17x_version()) {
3190 if (EnableInvokeDynamic) {
3191 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3192 warning("JSR 292 is not supported before 1.7. Disabling support.");
3193 }
3194 EnableInvokeDynamic = false;
3195 }
3196 }
3198 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3199 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3200 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3201 }
3202 ScavengeRootsInCode = 1;
3203 }
3205 if (PrintGCDetails) {
3206 // Turn on -verbose:gc options as well
3207 PrintGC = true;
3208 }
3210 if (!JDK_Version::is_gte_jdk18x_version()) {
3211 // To avoid changing the log format for 7 updates this flag is only
3212 // true by default in JDK8 and above.
3213 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3214 FLAG_SET_DEFAULT(PrintGCCause, false);
3215 }
3216 }
3218 // Set object alignment values.
3219 set_object_alignment();
3221 #if !INCLUDE_ALL_GCS
3222 force_serial_gc();
3223 #endif // INCLUDE_ALL_GCS
3224 #if !INCLUDE_CDS
3225 no_shared_spaces();
3226 #endif // INCLUDE_CDS
3228 // Set flags based on ergonomics.
3229 set_ergonomics_flags();
3231 set_shared_spaces_flags();
3233 // Check the GC selections again.
3234 if (!check_gc_consistency()) {
3235 return JNI_EINVAL;
3236 }
3238 if (TieredCompilation) {
3239 set_tiered_flags();
3240 } else {
3241 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3242 if (CompilationPolicyChoice >= 2) {
3243 vm_exit_during_initialization(
3244 "Incompatible compilation policy selected", NULL);
3245 }
3246 }
3248 // Set heap size based on available physical memory
3249 set_heap_size();
3251 #if INCLUDE_ALL_GCS
3252 // Set per-collector flags
3253 if (UseParallelGC || UseParallelOldGC) {
3254 set_parallel_gc_flags();
3255 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3256 set_cms_and_parnew_gc_flags();
3257 } else if (UseParNewGC) { // skipped if CMS is set above
3258 set_parnew_gc_flags();
3259 } else if (UseG1GC) {
3260 set_g1_gc_flags();
3261 }
3262 check_deprecated_gcs();
3263 #else // INCLUDE_ALL_GCS
3264 assert(verify_serial_gc_flags(), "SerialGC unset");
3265 #endif // INCLUDE_ALL_GCS
3267 // Set bytecode rewriting flags
3268 set_bytecode_flags();
3270 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3271 set_aggressive_opts_flags();
3273 // Turn off biased locking for locking debug mode flags,
3274 // which are subtlely different from each other but neither works with
3275 // biased locking.
3276 if (UseHeavyMonitors
3277 #ifdef COMPILER1
3278 || !UseFastLocking
3279 #endif // COMPILER1
3280 ) {
3281 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3282 // flag set to true on command line; warn the user that they
3283 // can't enable biased locking here
3284 warning("Biased Locking is not supported with locking debug flags"
3285 "; ignoring UseBiasedLocking flag." );
3286 }
3287 UseBiasedLocking = false;
3288 }
3290 #ifdef CC_INTERP
3291 // Clear flags not supported by the C++ interpreter
3292 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3293 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3294 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3295 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
3296 #endif // CC_INTERP
3298 #ifdef COMPILER2
3299 if (!UseBiasedLocking || EmitSync != 0) {
3300 UseOptoBiasInlining = false;
3301 }
3302 if (!EliminateLocks) {
3303 EliminateNestedLocks = false;
3304 }
3305 if (!Inline) {
3306 IncrementalInline = false;
3307 }
3308 #ifndef PRODUCT
3309 if (!IncrementalInline) {
3310 AlwaysIncrementalInline = false;
3311 }
3312 #endif
3313 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3314 // incremental inlining: bump MaxNodeLimit
3315 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3316 }
3317 #endif
3319 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3320 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3321 DebugNonSafepoints = true;
3322 }
3324 #ifndef PRODUCT
3325 if (CompileTheWorld) {
3326 // Force NmethodSweeper to sweep whole CodeCache each time.
3327 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3328 NmethodSweepFraction = 1;
3329 }
3330 }
3331 #endif
3333 if (PrintCommandLineFlags) {
3334 CommandLineFlags::printSetFlags(tty);
3335 }
3337 // Apply CPU specific policy for the BiasedLocking
3338 if (UseBiasedLocking) {
3339 if (!VM_Version::use_biased_locking() &&
3340 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3341 UseBiasedLocking = false;
3342 }
3343 }
3345 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3346 // but only if not already set on the commandline
3347 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3348 bool set = false;
3349 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3350 if (!set) {
3351 FLAG_SET_DEFAULT(PauseAtExit, true);
3352 }
3353 }
3355 return JNI_OK;
3356 }
3358 jint Arguments::adjust_after_os() {
3359 #if INCLUDE_ALL_GCS
3360 if (UseParallelGC || UseParallelOldGC) {
3361 if (UseNUMA) {
3362 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3363 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3364 }
3365 // For those collectors or operating systems (eg, Windows) that do
3366 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3367 UseNUMAInterleaving = true;
3368 }
3369 }
3370 #endif // INCLUDE_ALL_GCS
3371 return JNI_OK;
3372 }
3374 int Arguments::PropertyList_count(SystemProperty* pl) {
3375 int count = 0;
3376 while(pl != NULL) {
3377 count++;
3378 pl = pl->next();
3379 }
3380 return count;
3381 }
3383 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3384 assert(key != NULL, "just checking");
3385 SystemProperty* prop;
3386 for (prop = pl; prop != NULL; prop = prop->next()) {
3387 if (strcmp(key, prop->key()) == 0) return prop->value();
3388 }
3389 return NULL;
3390 }
3392 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3393 int count = 0;
3394 const char* ret_val = NULL;
3396 while(pl != NULL) {
3397 if(count >= index) {
3398 ret_val = pl->key();
3399 break;
3400 }
3401 count++;
3402 pl = pl->next();
3403 }
3405 return ret_val;
3406 }
3408 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3409 int count = 0;
3410 char* ret_val = NULL;
3412 while(pl != NULL) {
3413 if(count >= index) {
3414 ret_val = pl->value();
3415 break;
3416 }
3417 count++;
3418 pl = pl->next();
3419 }
3421 return ret_val;
3422 }
3424 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3425 SystemProperty* p = *plist;
3426 if (p == NULL) {
3427 *plist = new_p;
3428 } else {
3429 while (p->next() != NULL) {
3430 p = p->next();
3431 }
3432 p->set_next(new_p);
3433 }
3434 }
3436 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3437 if (plist == NULL)
3438 return;
3440 SystemProperty* new_p = new SystemProperty(k, v, true);
3441 PropertyList_add(plist, new_p);
3442 }
3444 // This add maintains unique property key in the list.
3445 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3446 if (plist == NULL)
3447 return;
3449 // If property key exist then update with new value.
3450 SystemProperty* prop;
3451 for (prop = *plist; prop != NULL; prop = prop->next()) {
3452 if (strcmp(k, prop->key()) == 0) {
3453 if (append) {
3454 prop->append_value(v);
3455 } else {
3456 prop->set_value(v);
3457 }
3458 return;
3459 }
3460 }
3462 PropertyList_add(plist, k, v);
3463 }
3465 #ifdef KERNEL
3466 char *Arguments::get_kernel_properties() {
3467 // Find properties starting with kernel and append them to string
3468 // We need to find out how long they are first because the URL's that they
3469 // might point to could get long.
3470 int length = 0;
3471 SystemProperty* prop;
3472 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3473 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3474 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3475 }
3476 }
3477 // Add one for null terminator.
3478 char *props = AllocateHeap(length + 1, mtInternal);
3479 if (length != 0) {
3480 int pos = 0;
3481 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3482 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3483 jio_snprintf(&props[pos], length-pos,
3484 "-D%s=%s ", prop->key(), prop->value());
3485 pos = strlen(props);
3486 }
3487 }
3488 }
3489 // null terminate props in case of null
3490 props[length] = '\0';
3491 return props;
3492 }
3493 #endif // KERNEL
3495 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3496 // Returns true if all of the source pointed by src has been copied over to
3497 // the destination buffer pointed by buf. Otherwise, returns false.
3498 // Notes:
3499 // 1. If the length (buflen) of the destination buffer excluding the
3500 // NULL terminator character is not long enough for holding the expanded
3501 // pid characters, it also returns false instead of returning the partially
3502 // expanded one.
3503 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3504 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3505 char* buf, size_t buflen) {
3506 const char* p = src;
3507 char* b = buf;
3508 const char* src_end = &src[srclen];
3509 char* buf_end = &buf[buflen - 1];
3511 while (p < src_end && b < buf_end) {
3512 if (*p == '%') {
3513 switch (*(++p)) {
3514 case '%': // "%%" ==> "%"
3515 *b++ = *p++;
3516 break;
3517 case 'p': { // "%p" ==> current process id
3518 // buf_end points to the character before the last character so
3519 // that we could write '\0' to the end of the buffer.
3520 size_t buf_sz = buf_end - b + 1;
3521 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3523 // if jio_snprintf fails or the buffer is not long enough to hold
3524 // the expanded pid, returns false.
3525 if (ret < 0 || ret >= (int)buf_sz) {
3526 return false;
3527 } else {
3528 b += ret;
3529 assert(*b == '\0', "fail in copy_expand_pid");
3530 if (p == src_end && b == buf_end + 1) {
3531 // reach the end of the buffer.
3532 return true;
3533 }
3534 }
3535 p++;
3536 break;
3537 }
3538 default :
3539 *b++ = '%';
3540 }
3541 } else {
3542 *b++ = *p++;
3543 }
3544 }
3545 *b = '\0';
3546 return (p == src_end); // return false if not all of the source was copied
3547 }
