Mercurial > jdk8-mips64-public > hotspot / file revision
src/share/vm/runtime/arguments.cpp@8b46b0196eb0
src/share/vm/runtime/arguments.cpp
Fri, 25 Jan 2013 10:04:08 -0500
- author
- zgu
- date
- Fri, 25 Jan 2013 10:04:08 -0500
- changeset 4492
- 8b46b0196eb0
- parent 4469
- c73c3f2c5b3b
- child 4502
- baf7fac3167e
- permissions
- -rw-r--r--
8000692: Remove old KERNEL code
Summary: Removed depreciated kernel VM source code from hotspot VM
Reviewed-by: dholmes, acorn
1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
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/taskqueue.hpp"
42 #ifdef TARGET_OS_FAMILY_linux
43 # include "os_linux.inline.hpp"
44 #endif
45 #ifdef TARGET_OS_FAMILY_solaris
46 # include "os_solaris.inline.hpp"
47 #endif
48 #ifdef TARGET_OS_FAMILY_windows
49 # include "os_windows.inline.hpp"
50 #endif
51 #ifdef TARGET_OS_FAMILY_bsd
52 # include "os_bsd.inline.hpp"
53 #endif
54 #ifndef SERIALGC
55 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
56 #endif
58 // Note: This is a special bug reporting site for the JVM
59 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
60 #define DEFAULT_JAVA_LAUNCHER "generic"
62 char** Arguments::_jvm_flags_array = NULL;
63 int Arguments::_num_jvm_flags = 0;
64 char** Arguments::_jvm_args_array = NULL;
65 int Arguments::_num_jvm_args = 0;
66 char* Arguments::_java_command = NULL;
67 SystemProperty* Arguments::_system_properties = NULL;
68 const char* Arguments::_gc_log_filename = NULL;
69 bool Arguments::_has_profile = false;
70 bool Arguments::_has_alloc_profile = false;
71 uintx Arguments::_min_heap_size = 0;
72 Arguments::Mode Arguments::_mode = _mixed;
73 bool Arguments::_java_compiler = false;
74 bool Arguments::_xdebug_mode = false;
75 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
76 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
77 int Arguments::_sun_java_launcher_pid = -1;
78 bool Arguments::_created_by_gamma_launcher = false;
80 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
81 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
82 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
83 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
84 bool Arguments::_ClipInlining = ClipInlining;
86 char* Arguments::SharedArchivePath = NULL;
88 AgentLibraryList Arguments::_libraryList;
89 AgentLibraryList Arguments::_agentList;
91 abort_hook_t Arguments::_abort_hook = NULL;
92 exit_hook_t Arguments::_exit_hook = NULL;
93 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
96 SystemProperty *Arguments::_java_ext_dirs = NULL;
97 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
98 SystemProperty *Arguments::_sun_boot_library_path = NULL;
99 SystemProperty *Arguments::_java_library_path = NULL;
100 SystemProperty *Arguments::_java_home = NULL;
101 SystemProperty *Arguments::_java_class_path = NULL;
102 SystemProperty *Arguments::_sun_boot_class_path = NULL;
104 char* Arguments::_meta_index_path = NULL;
105 char* Arguments::_meta_index_dir = NULL;
107 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
109 static bool match_option(const JavaVMOption *option, const char* name,
110 const char** tail) {
111 int len = (int)strlen(name);
112 if (strncmp(option->optionString, name, len) == 0) {
113 *tail = option->optionString + len;
114 return true;
115 } else {
116 return false;
117 }
118 }
120 static void logOption(const char* opt) {
121 if (PrintVMOptions) {
122 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
123 }
124 }
126 // Process java launcher properties.
127 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
128 // See if sun.java.launcher or sun.java.launcher.pid is defined.
129 // Must do this before setting up other system properties,
130 // as some of them may depend on launcher type.
131 for (int index = 0; index < args->nOptions; index++) {
132 const JavaVMOption* option = args->options + index;
133 const char* tail;
135 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
136 process_java_launcher_argument(tail, option->extraInfo);
137 continue;
138 }
139 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
140 _sun_java_launcher_pid = atoi(tail);
141 continue;
142 }
143 }
144 }
146 // Initialize system properties key and value.
147 void Arguments::init_system_properties() {
149 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
150 "Java Virtual Machine Specification", false));
151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
155 // following are JVMTI agent writeable properties.
156 // Properties values are set to NULL and they are
157 // os specific they are initialized in os::init_system_properties_values().
158 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
159 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
160 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
161 _java_library_path = new SystemProperty("java.library.path", NULL, true);
162 _java_home = new SystemProperty("java.home", NULL, true);
163 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
165 _java_class_path = new SystemProperty("java.class.path", "", true);
167 // Add to System Property list.
168 PropertyList_add(&_system_properties, _java_ext_dirs);
169 PropertyList_add(&_system_properties, _java_endorsed_dirs);
170 PropertyList_add(&_system_properties, _sun_boot_library_path);
171 PropertyList_add(&_system_properties, _java_library_path);
172 PropertyList_add(&_system_properties, _java_home);
173 PropertyList_add(&_system_properties, _java_class_path);
174 PropertyList_add(&_system_properties, _sun_boot_class_path);
176 // Set OS specific system properties values
177 os::init_system_properties_values();
178 }
181 // Update/Initialize System properties after JDK version number is known
182 void Arguments::init_version_specific_system_properties() {
183 enum { bufsz = 16 };
184 char buffer[bufsz];
185 const char* spec_vendor = "Sun Microsystems Inc.";
186 uint32_t spec_version = 0;
188 if (JDK_Version::is_gte_jdk17x_version()) {
189 spec_vendor = "Oracle Corporation";
190 spec_version = JDK_Version::current().major_version();
191 }
192 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
194 PropertyList_add(&_system_properties,
195 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
196 PropertyList_add(&_system_properties,
197 new SystemProperty("java.vm.specification.version", buffer, false));
198 PropertyList_add(&_system_properties,
199 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
200 }
202 /**
203 * Provide a slightly more user-friendly way of eliminating -XX flags.
204 * When a flag is eliminated, it can be added to this list in order to
205 * continue accepting this flag on the command-line, while issuing a warning
206 * and ignoring the value. Once the JDK version reaches the 'accept_until'
207 * limit, we flatly refuse to admit the existence of the flag. This allows
208 * a flag to die correctly over JDK releases using HSX.
209 */
210 typedef struct {
211 const char* name;
212 JDK_Version obsoleted_in; // when the flag went away
213 JDK_Version accept_until; // which version to start denying the existence
214 } ObsoleteFlag;
216 static ObsoleteFlag obsolete_jvm_flags[] = {
217 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
218 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
230 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
231 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
232 { "DefaultInitialRAMFraction",
233 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
234 { "UseDepthFirstScavengeOrder",
235 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
236 { "HandlePromotionFailure",
237 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
238 { "MaxLiveObjectEvacuationRatio",
239 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
240 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
241 { "UseParallelOldGCCompacting",
242 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
243 { "UseParallelDensePrefixUpdate",
244 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
245 { "UseParallelOldGCDensePrefix",
246 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
247 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
248 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
249 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
250 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
251 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
252 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
253 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
254 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
255 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
256 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
257 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
258 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
259 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
260 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
261 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
262 #ifdef PRODUCT
263 { "DesiredMethodLimit",
264 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
265 #endif // PRODUCT
266 { NULL, JDK_Version(0), JDK_Version(0) }
267 };
269 // Returns true if the flag is obsolete and fits into the range specified
270 // for being ignored. In the case that the flag is ignored, the 'version'
271 // value is filled in with the version number when the flag became
272 // obsolete so that that value can be displayed to the user.
273 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
274 int i = 0;
275 assert(version != NULL, "Must provide a version buffer");
276 while (obsolete_jvm_flags[i].name != NULL) {
277 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
278 // <flag>=xxx form
279 // [-|+]<flag> form
280 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
281 ((s[0] == '+' || s[0] == '-') &&
282 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
283 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
284 *version = flag_status.obsoleted_in;
285 return true;
286 }
287 }
288 i++;
289 }
290 return false;
291 }
293 // Constructs the system class path (aka boot class path) from the following
294 // components, in order:
295 //
296 // prefix // from -Xbootclasspath/p:...
297 // endorsed // the expansion of -Djava.endorsed.dirs=...
298 // base // from os::get_system_properties() or -Xbootclasspath=
299 // suffix // from -Xbootclasspath/a:...
300 //
301 // java.endorsed.dirs is a list of directories; any jar or zip files in the
302 // directories are added to the sysclasspath just before the base.
303 //
304 // This could be AllStatic, but it isn't needed after argument processing is
305 // complete.
306 class SysClassPath: public StackObj {
307 public:
308 SysClassPath(const char* base);
309 ~SysClassPath();
311 inline void set_base(const char* base);
312 inline void add_prefix(const char* prefix);
313 inline void add_suffix_to_prefix(const char* suffix);
314 inline void add_suffix(const char* suffix);
315 inline void reset_path(const char* base);
317 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
318 // property. Must be called after all command-line arguments have been
319 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
320 // combined_path().
321 void expand_endorsed();
323 inline const char* get_base() const { return _items[_scp_base]; }
324 inline const char* get_prefix() const { return _items[_scp_prefix]; }
325 inline const char* get_suffix() const { return _items[_scp_suffix]; }
326 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
328 // Combine all the components into a single c-heap-allocated string; caller
329 // must free the string if/when no longer needed.
330 char* combined_path();
332 private:
333 // Utility routines.
334 static char* add_to_path(const char* path, const char* str, bool prepend);
335 static char* add_jars_to_path(char* path, const char* directory);
337 inline void reset_item_at(int index);
339 // Array indices for the items that make up the sysclasspath. All except the
340 // base are allocated in the C heap and freed by this class.
341 enum {
342 _scp_prefix, // from -Xbootclasspath/p:...
343 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
344 _scp_base, // the default sysclasspath
345 _scp_suffix, // from -Xbootclasspath/a:...
346 _scp_nitems // the number of items, must be last.
347 };
349 const char* _items[_scp_nitems];
350 DEBUG_ONLY(bool _expansion_done;)
351 };
353 SysClassPath::SysClassPath(const char* base) {
354 memset(_items, 0, sizeof(_items));
355 _items[_scp_base] = base;
356 DEBUG_ONLY(_expansion_done = false;)
357 }
359 SysClassPath::~SysClassPath() {
360 // Free everything except the base.
361 for (int i = 0; i < _scp_nitems; ++i) {
362 if (i != _scp_base) reset_item_at(i);
363 }
364 DEBUG_ONLY(_expansion_done = false;)
365 }
367 inline void SysClassPath::set_base(const char* base) {
368 _items[_scp_base] = base;
369 }
371 inline void SysClassPath::add_prefix(const char* prefix) {
372 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
373 }
375 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
376 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
377 }
379 inline void SysClassPath::add_suffix(const char* suffix) {
380 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
381 }
383 inline void SysClassPath::reset_item_at(int index) {
384 assert(index < _scp_nitems && index != _scp_base, "just checking");
385 if (_items[index] != NULL) {
386 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
387 _items[index] = NULL;
388 }
389 }
391 inline void SysClassPath::reset_path(const char* base) {
392 // Clear the prefix and suffix.
393 reset_item_at(_scp_prefix);
394 reset_item_at(_scp_suffix);
395 set_base(base);
396 }
398 //------------------------------------------------------------------------------
400 void SysClassPath::expand_endorsed() {
401 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
403 const char* path = Arguments::get_property("java.endorsed.dirs");
404 if (path == NULL) {
405 path = Arguments::get_endorsed_dir();
406 assert(path != NULL, "no default for java.endorsed.dirs");
407 }
409 char* expanded_path = NULL;
410 const char separator = *os::path_separator();
411 const char* const end = path + strlen(path);
412 while (path < end) {
413 const char* tmp_end = strchr(path, separator);
414 if (tmp_end == NULL) {
415 expanded_path = add_jars_to_path(expanded_path, path);
416 path = end;
417 } else {
418 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
419 memcpy(dirpath, path, tmp_end - path);
420 dirpath[tmp_end - path] = '\0';
421 expanded_path = add_jars_to_path(expanded_path, dirpath);
422 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
423 path = tmp_end + 1;
424 }
425 }
426 _items[_scp_endorsed] = expanded_path;
427 DEBUG_ONLY(_expansion_done = true;)
428 }
430 // Combine the bootclasspath elements, some of which may be null, into a single
431 // c-heap-allocated string.
432 char* SysClassPath::combined_path() {
433 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
434 assert(_expansion_done, "must call expand_endorsed() first.");
436 size_t lengths[_scp_nitems];
437 size_t total_len = 0;
439 const char separator = *os::path_separator();
441 // Get the lengths.
442 int i;
443 for (i = 0; i < _scp_nitems; ++i) {
444 if (_items[i] != NULL) {
445 lengths[i] = strlen(_items[i]);
446 // Include space for the separator char (or a NULL for the last item).
447 total_len += lengths[i] + 1;
448 }
449 }
450 assert(total_len > 0, "empty sysclasspath not allowed");
452 // Copy the _items to a single string.
453 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
454 char* cp_tmp = cp;
455 for (i = 0; i < _scp_nitems; ++i) {
456 if (_items[i] != NULL) {
457 memcpy(cp_tmp, _items[i], lengths[i]);
458 cp_tmp += lengths[i];
459 *cp_tmp++ = separator;
460 }
461 }
462 *--cp_tmp = '\0'; // Replace the extra separator.
463 return cp;
464 }
466 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
467 char*
468 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
469 char *cp;
471 assert(str != NULL, "just checking");
472 if (path == NULL) {
473 size_t len = strlen(str) + 1;
474 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
475 memcpy(cp, str, len); // copy the trailing null
476 } else {
477 const char separator = *os::path_separator();
478 size_t old_len = strlen(path);
479 size_t str_len = strlen(str);
480 size_t len = old_len + str_len + 2;
482 if (prepend) {
483 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
484 char* cp_tmp = cp;
485 memcpy(cp_tmp, str, str_len);
486 cp_tmp += str_len;
487 *cp_tmp = separator;
488 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
489 FREE_C_HEAP_ARRAY(char, path, mtInternal);
490 } else {
491 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
492 char* cp_tmp = cp + old_len;
493 *cp_tmp = separator;
494 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
495 }
496 }
497 return cp;
498 }
500 // Scan the directory and append any jar or zip files found to path.
501 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
502 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
503 DIR* dir = os::opendir(directory);
504 if (dir == NULL) return path;
506 char dir_sep[2] = { '\0', '\0' };
507 size_t directory_len = strlen(directory);
508 const char fileSep = *os::file_separator();
509 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
511 /* Scan the directory for jars/zips, appending them to path. */
512 struct dirent *entry;
513 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
514 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
515 const char* name = entry->d_name;
516 const char* ext = name + strlen(name) - 4;
517 bool isJarOrZip = ext > name &&
518 (os::file_name_strcmp(ext, ".jar") == 0 ||
519 os::file_name_strcmp(ext, ".zip") == 0);
520 if (isJarOrZip) {
521 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
522 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
523 path = add_to_path(path, jarpath, false);
524 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
525 }
526 }
527 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
528 os::closedir(dir);
529 return path;
530 }
532 // Parses a memory size specification string.
533 static bool atomull(const char *s, julong* result) {
534 julong n = 0;
535 int args_read = sscanf(s, JULONG_FORMAT, &n);
536 if (args_read != 1) {
537 return false;
538 }
539 while (*s != '\0' && isdigit(*s)) {
540 s++;
541 }
542 // 4705540: illegal if more characters are found after the first non-digit
543 if (strlen(s) > 1) {
544 return false;
545 }
546 switch (*s) {
547 case 'T': case 't':
548 *result = n * G * K;
549 // Check for overflow.
550 if (*result/((julong)G * K) != n) return false;
551 return true;
552 case 'G': case 'g':
553 *result = n * G;
554 if (*result/G != n) return false;
555 return true;
556 case 'M': case 'm':
557 *result = n * M;
558 if (*result/M != n) return false;
559 return true;
560 case 'K': case 'k':
561 *result = n * K;
562 if (*result/K != n) return false;
563 return true;
564 case '\0':
565 *result = n;
566 return true;
567 default:
568 return false;
569 }
570 }
572 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
573 if (size < min_size) return arg_too_small;
574 // Check that size will fit in a size_t (only relevant on 32-bit)
575 if (size > max_uintx) return arg_too_big;
576 return arg_in_range;
577 }
579 // Describe an argument out of range error
580 void Arguments::describe_range_error(ArgsRange errcode) {
581 switch(errcode) {
582 case arg_too_big:
583 jio_fprintf(defaultStream::error_stream(),
584 "The specified size exceeds the maximum "
585 "representable size.\n");
586 break;
587 case arg_too_small:
588 case arg_unreadable:
589 case arg_in_range:
590 // do nothing for now
591 break;
592 default:
593 ShouldNotReachHere();
594 }
595 }
597 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
598 return CommandLineFlags::boolAtPut(name, &value, origin);
599 }
601 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
602 double v;
603 if (sscanf(value, "%lf", &v) != 1) {
604 return false;
605 }
607 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
608 return true;
609 }
610 return false;
611 }
613 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
614 julong v;
615 intx intx_v;
616 bool is_neg = false;
617 // Check the sign first since atomull() parses only unsigned values.
618 if (*value == '-') {
619 if (!CommandLineFlags::intxAt(name, &intx_v)) {
620 return false;
621 }
622 value++;
623 is_neg = true;
624 }
625 if (!atomull(value, &v)) {
626 return false;
627 }
628 intx_v = (intx) v;
629 if (is_neg) {
630 intx_v = -intx_v;
631 }
632 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
633 return true;
634 }
635 uintx uintx_v = (uintx) v;
636 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
637 return true;
638 }
639 uint64_t uint64_t_v = (uint64_t) v;
640 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
641 return true;
642 }
643 return false;
644 }
646 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
647 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
648 // Contract: CommandLineFlags always returns a pointer that needs freeing.
649 FREE_C_HEAP_ARRAY(char, value, mtInternal);
650 return true;
651 }
653 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
654 const char* old_value = "";
655 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
656 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
657 size_t new_len = strlen(new_value);
658 const char* value;
659 char* free_this_too = NULL;
660 if (old_len == 0) {
661 value = new_value;
662 } else if (new_len == 0) {
663 value = old_value;
664 } else {
665 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
666 // each new setting adds another LINE to the switch:
667 sprintf(buf, "%s\n%s", old_value, new_value);
668 value = buf;
669 free_this_too = buf;
670 }
671 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
672 // CommandLineFlags always returns a pointer that needs freeing.
673 FREE_C_HEAP_ARRAY(char, value, mtInternal);
674 if (free_this_too != NULL) {
675 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
676 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
677 }
678 return true;
679 }
681 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
683 // range of acceptable characters spelled out for portability reasons
684 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
685 #define BUFLEN 255
686 char name[BUFLEN+1];
687 char dummy;
689 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
690 return set_bool_flag(name, false, origin);
691 }
692 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
693 return set_bool_flag(name, true, origin);
694 }
696 char punct;
697 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
698 const char* value = strchr(arg, '=') + 1;
699 Flag* flag = Flag::find_flag(name, strlen(name));
700 if (flag != NULL && flag->is_ccstr()) {
701 if (flag->ccstr_accumulates()) {
702 return append_to_string_flag(name, value, origin);
703 } else {
704 if (value[0] == '\0') {
705 value = NULL;
706 }
707 return set_string_flag(name, value, origin);
708 }
709 }
710 }
712 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
713 const char* value = strchr(arg, '=') + 1;
714 // -XX:Foo:=xxx will reset the string flag to the given value.
715 if (value[0] == '\0') {
716 value = NULL;
717 }
718 return set_string_flag(name, value, origin);
719 }
721 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
722 #define SIGNED_NUMBER_RANGE "[-0123456789]"
723 #define NUMBER_RANGE "[0123456789]"
724 char value[BUFLEN + 1];
725 char value2[BUFLEN + 1];
726 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
727 // Looks like a floating-point number -- try again with more lenient format string
728 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
729 return set_fp_numeric_flag(name, value, origin);
730 }
731 }
733 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
734 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
735 return set_numeric_flag(name, value, origin);
736 }
738 return false;
739 }
741 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
742 assert(bldarray != NULL, "illegal argument");
744 if (arg == NULL) {
745 return;
746 }
748 int index = *count;
750 // expand the array and add arg to the last element
751 (*count)++;
752 if (*bldarray == NULL) {
753 *bldarray = NEW_C_HEAP_ARRAY(char*, *count, mtInternal);
754 } else {
755 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count, mtInternal);
756 }
757 (*bldarray)[index] = strdup(arg);
758 }
760 void Arguments::build_jvm_args(const char* arg) {
761 add_string(&_jvm_args_array, &_num_jvm_args, arg);
762 }
764 void Arguments::build_jvm_flags(const char* arg) {
765 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
766 }
768 // utility function to return a string that concatenates all
769 // strings in a given char** array
770 const char* Arguments::build_resource_string(char** args, int count) {
771 if (args == NULL || count == 0) {
772 return NULL;
773 }
774 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
775 for (int i = 1; i < count; i++) {
776 length += strlen(args[i]) + 1; // add 1 for a space
777 }
778 char* s = NEW_RESOURCE_ARRAY(char, length);
779 strcpy(s, args[0]);
780 for (int j = 1; j < count; j++) {
781 strcat(s, " ");
782 strcat(s, args[j]);
783 }
784 return (const char*) s;
785 }
787 void Arguments::print_on(outputStream* st) {
788 st->print_cr("VM Arguments:");
789 if (num_jvm_flags() > 0) {
790 st->print("jvm_flags: "); print_jvm_flags_on(st);
791 }
792 if (num_jvm_args() > 0) {
793 st->print("jvm_args: "); print_jvm_args_on(st);
794 }
795 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
796 if (_java_class_path != NULL) {
797 char* path = _java_class_path->value();
798 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
799 }
800 st->print_cr("Launcher Type: %s", _sun_java_launcher);
801 }
803 void Arguments::print_jvm_flags_on(outputStream* st) {
804 if (_num_jvm_flags > 0) {
805 for (int i=0; i < _num_jvm_flags; i++) {
806 st->print("%s ", _jvm_flags_array[i]);
807 }
808 st->print_cr("");
809 }
810 }
812 void Arguments::print_jvm_args_on(outputStream* st) {
813 if (_num_jvm_args > 0) {
814 for (int i=0; i < _num_jvm_args; i++) {
815 st->print("%s ", _jvm_args_array[i]);
816 }
817 st->print_cr("");
818 }
819 }
821 bool Arguments::process_argument(const char* arg,
822 jboolean ignore_unrecognized, FlagValueOrigin origin) {
824 JDK_Version since = JDK_Version();
826 if (parse_argument(arg, origin) || ignore_unrecognized) {
827 return true;
828 }
830 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg;
831 if (is_newly_obsolete(arg, &since)) {
832 char version[256];
833 since.to_string(version, sizeof(version));
834 warning("ignoring option %s; support was removed in %s", argname, version);
835 return true;
836 }
838 // For locked flags, report a custom error message if available.
839 // Otherwise, report the standard unrecognized VM option.
841 Flag* locked_flag = Flag::find_flag((char*)argname, strlen(argname), true);
842 if (locked_flag != NULL) {
843 char locked_message_buf[BUFLEN];
844 locked_flag->get_locked_message(locked_message_buf, BUFLEN);
845 if (strlen(locked_message_buf) == 0) {
846 jio_fprintf(defaultStream::error_stream(),
847 "Unrecognized VM option '%s'\n", argname);
848 } else {
849 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
850 }
851 } else {
852 jio_fprintf(defaultStream::error_stream(),
853 "Unrecognized VM option '%s'\n", argname);
854 }
856 // allow for commandline "commenting out" options like -XX:#+Verbose
857 return arg[0] == '#';
858 }
860 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
861 FILE* stream = fopen(file_name, "rb");
862 if (stream == NULL) {
863 if (should_exist) {
864 jio_fprintf(defaultStream::error_stream(),
865 "Could not open settings file %s\n", file_name);
866 return false;
867 } else {
868 return true;
869 }
870 }
872 char token[1024];
873 int pos = 0;
875 bool in_white_space = true;
876 bool in_comment = false;
877 bool in_quote = false;
878 char quote_c = 0;
879 bool result = true;
881 int c = getc(stream);
882 while(c != EOF && pos < (int)(sizeof(token)-1)) {
883 if (in_white_space) {
884 if (in_comment) {
885 if (c == '\n') in_comment = false;
886 } else {
887 if (c == '#') in_comment = true;
888 else if (!isspace(c)) {
889 in_white_space = false;
890 token[pos++] = c;
891 }
892 }
893 } else {
894 if (c == '\n' || (!in_quote && isspace(c))) {
895 // token ends at newline, or at unquoted whitespace
896 // this allows a way to include spaces in string-valued options
897 token[pos] = '\0';
898 logOption(token);
899 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
900 build_jvm_flags(token);
901 pos = 0;
902 in_white_space = true;
903 in_quote = false;
904 } else if (!in_quote && (c == '\'' || c == '"')) {
905 in_quote = true;
906 quote_c = c;
907 } else if (in_quote && (c == quote_c)) {
908 in_quote = false;
909 } else {
910 token[pos++] = c;
911 }
912 }
913 c = getc(stream);
914 }
915 if (pos > 0) {
916 token[pos] = '\0';
917 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
918 build_jvm_flags(token);
919 }
920 fclose(stream);
921 return result;
922 }
924 //=============================================================================================================
925 // Parsing of properties (-D)
927 const char* Arguments::get_property(const char* key) {
928 return PropertyList_get_value(system_properties(), key);
929 }
931 bool Arguments::add_property(const char* prop) {
932 const char* eq = strchr(prop, '=');
933 char* key;
934 // ns must be static--its address may be stored in a SystemProperty object.
935 const static char ns[1] = {0};
936 char* value = (char *)ns;
938 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
939 key = AllocateHeap(key_len + 1, mtInternal);
940 strncpy(key, prop, key_len);
941 key[key_len] = '\0';
943 if (eq != NULL) {
944 size_t value_len = strlen(prop) - key_len - 1;
945 value = AllocateHeap(value_len + 1, mtInternal);
946 strncpy(value, &prop[key_len + 1], value_len + 1);
947 }
949 if (strcmp(key, "java.compiler") == 0) {
950 process_java_compiler_argument(value);
951 FreeHeap(key);
952 if (eq != NULL) {
953 FreeHeap(value);
954 }
955 return true;
956 } else if (strcmp(key, "sun.java.command") == 0) {
957 _java_command = value;
959 // Record value in Arguments, but let it get passed to Java.
960 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
961 // launcher.pid property is private and is processed
962 // in process_sun_java_launcher_properties();
963 // the sun.java.launcher property is passed on to the java application
964 FreeHeap(key);
965 if (eq != NULL) {
966 FreeHeap(value);
967 }
968 return true;
969 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
970 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
971 // its value without going through the property list or making a Java call.
972 _java_vendor_url_bug = value;
973 } else if (strcmp(key, "sun.boot.library.path") == 0) {
974 PropertyList_unique_add(&_system_properties, key, value, true);
975 return true;
976 }
977 // Create new property and add at the end of the list
978 PropertyList_unique_add(&_system_properties, key, value);
979 return true;
980 }
982 //===========================================================================================================
983 // Setting int/mixed/comp mode flags
985 void Arguments::set_mode_flags(Mode mode) {
986 // Set up default values for all flags.
987 // If you add a flag to any of the branches below,
988 // add a default value for it here.
989 set_java_compiler(false);
990 _mode = mode;
992 // Ensure Agent_OnLoad has the correct initial values.
993 // This may not be the final mode; mode may change later in onload phase.
994 PropertyList_unique_add(&_system_properties, "java.vm.info",
995 (char*)VM_Version::vm_info_string(), false);
997 UseInterpreter = true;
998 UseCompiler = true;
999 UseLoopCounter = true;
1001 #ifndef ZERO
1002 // Turn these off for mixed and comp. Leave them on for Zero.
1003 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1004 UseFastAccessorMethods = (mode == _int);
1005 }
1006 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1007 UseFastEmptyMethods = (mode == _int);
1008 }
1009 #endif
1011 // Default values may be platform/compiler dependent -
1012 // use the saved values
1013 ClipInlining = Arguments::_ClipInlining;
1014 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1015 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1016 BackgroundCompilation = Arguments::_BackgroundCompilation;
1018 // Change from defaults based on mode
1019 switch (mode) {
1020 default:
1021 ShouldNotReachHere();
1022 break;
1023 case _int:
1024 UseCompiler = false;
1025 UseLoopCounter = false;
1026 AlwaysCompileLoopMethods = false;
1027 UseOnStackReplacement = false;
1028 break;
1029 case _mixed:
1030 // same as default
1031 break;
1032 case _comp:
1033 UseInterpreter = false;
1034 BackgroundCompilation = false;
1035 ClipInlining = false;
1036 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1037 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1038 // compile a level 4 (C2) and then continue executing it.
1039 if (TieredCompilation) {
1040 Tier3InvokeNotifyFreqLog = 0;
1041 Tier4InvocationThreshold = 0;
1042 }
1043 break;
1044 }
1045 }
1047 // Conflict: required to use shared spaces (-Xshare:on), but
1048 // incompatible command line options were chosen.
1050 static void no_shared_spaces() {
1051 if (RequireSharedSpaces) {
1052 jio_fprintf(defaultStream::error_stream(),
1053 "Class data sharing is inconsistent with other specified options.\n");
1054 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1055 } else {
1056 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1057 }
1058 }
1060 void Arguments::set_tiered_flags() {
1061 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1062 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1063 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1064 }
1065 if (CompilationPolicyChoice < 2) {
1066 vm_exit_during_initialization(
1067 "Incompatible compilation policy selected", NULL);
1068 }
1069 // Increase the code cache size - tiered compiles a lot more.
1070 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1071 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1072 }
1073 }
1075 #if INCLUDE_ALTERNATE_GCS
1076 static void disable_adaptive_size_policy(const char* collector_name) {
1077 if (UseAdaptiveSizePolicy) {
1078 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1079 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1080 collector_name);
1081 }
1082 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1083 }
1084 }
1086 void Arguments::set_parnew_gc_flags() {
1087 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1088 "control point invariant");
1089 assert(UseParNewGC, "Error");
1091 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1092 disable_adaptive_size_policy("UseParNewGC");
1094 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1095 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1096 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1097 } else if (ParallelGCThreads == 0) {
1098 jio_fprintf(defaultStream::error_stream(),
1099 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1100 vm_exit(1);
1101 }
1103 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1104 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1105 // we set them to 1024 and 1024.
1106 // See CR 6362902.
1107 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1108 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1109 }
1110 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1111 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1112 }
1114 // AlwaysTenure flag should make ParNew promote all at first collection.
1115 // See CR 6362902.
1116 if (AlwaysTenure) {
1117 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1118 }
1119 // When using compressed oops, we use local overflow stacks,
1120 // rather than using a global overflow list chained through
1121 // the klass word of the object's pre-image.
1122 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1123 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1124 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1125 }
1126 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1127 }
1128 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1129 }
1131 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1132 // sparc/solaris for certain applications, but would gain from
1133 // further optimization and tuning efforts, and would almost
1134 // certainly gain from analysis of platform and environment.
1135 void Arguments::set_cms_and_parnew_gc_flags() {
1136 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1137 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1139 // If we are using CMS, we prefer to UseParNewGC,
1140 // unless explicitly forbidden.
1141 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1142 FLAG_SET_ERGO(bool, UseParNewGC, true);
1143 }
1145 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1146 disable_adaptive_size_policy("UseConcMarkSweepGC");
1148 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1149 // as needed.
1150 if (UseParNewGC) {
1151 set_parnew_gc_flags();
1152 }
1154 // MaxHeapSize is aligned down in collectorPolicy
1155 size_t max_heap = align_size_down(MaxHeapSize,
1156 CardTableRS::ct_max_alignment_constraint());
1158 // Now make adjustments for CMS
1159 intx tenuring_default = (intx)6;
1160 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1162 // Preferred young gen size for "short" pauses:
1163 // upper bound depends on # of threads and NewRatio.
1164 const uintx parallel_gc_threads =
1165 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1166 const size_t preferred_max_new_size_unaligned =
1167 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1168 size_t preferred_max_new_size =
1169 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1171 // Unless explicitly requested otherwise, size young gen
1172 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1174 // If either MaxNewSize or NewRatio is set on the command line,
1175 // assume the user is trying to set the size of the young gen.
1176 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1178 // Set MaxNewSize to our calculated preferred_max_new_size unless
1179 // NewSize was set on the command line and it is larger than
1180 // preferred_max_new_size.
1181 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1182 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1183 } else {
1184 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1185 }
1186 if (PrintGCDetails && Verbose) {
1187 // Too early to use gclog_or_tty
1188 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1189 }
1191 // Code along this path potentially sets NewSize and OldSize
1193 assert(max_heap >= InitialHeapSize, "Error");
1194 assert(max_heap >= NewSize, "Error");
1196 if (PrintGCDetails && Verbose) {
1197 // Too early to use gclog_or_tty
1198 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1199 " initial_heap_size: " SIZE_FORMAT
1200 " max_heap: " SIZE_FORMAT,
1201 min_heap_size(), InitialHeapSize, max_heap);
1202 }
1203 size_t min_new = preferred_max_new_size;
1204 if (FLAG_IS_CMDLINE(NewSize)) {
1205 min_new = NewSize;
1206 }
1207 if (max_heap > min_new && min_heap_size() > min_new) {
1208 // Unless explicitly requested otherwise, make young gen
1209 // at least min_new, and at most preferred_max_new_size.
1210 if (FLAG_IS_DEFAULT(NewSize)) {
1211 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1212 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1213 if (PrintGCDetails && Verbose) {
1214 // Too early to use gclog_or_tty
1215 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1216 }
1217 }
1218 // Unless explicitly requested otherwise, size old gen
1219 // so it's NewRatio x of NewSize.
1220 if (FLAG_IS_DEFAULT(OldSize)) {
1221 if (max_heap > NewSize) {
1222 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1223 if (PrintGCDetails && Verbose) {
1224 // Too early to use gclog_or_tty
1225 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1226 }
1227 }
1228 }
1229 }
1230 }
1231 // Unless explicitly requested otherwise, definitely
1232 // promote all objects surviving "tenuring_default" scavenges.
1233 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1234 FLAG_IS_DEFAULT(SurvivorRatio)) {
1235 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1236 }
1237 // If we decided above (or user explicitly requested)
1238 // `promote all' (via MaxTenuringThreshold := 0),
1239 // prefer minuscule survivor spaces so as not to waste
1240 // space for (non-existent) survivors
1241 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1242 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1243 }
1244 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1245 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1246 // This is done in order to make ParNew+CMS configuration to work
1247 // with YoungPLABSize and OldPLABSize options.
1248 // See CR 6362902.
1249 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1250 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1251 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1252 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1253 // the value (either from the command line or ergonomics) of
1254 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1255 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1256 } else {
1257 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1258 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1259 // we'll let it to take precedence.
1260 jio_fprintf(defaultStream::error_stream(),
1261 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1262 " options are specified for the CMS collector."
1263 " CMSParPromoteBlocksToClaim will take precedence.\n");
1264 }
1265 }
1266 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1267 // OldPLAB sizing manually turned off: Use a larger default setting,
1268 // unless it was manually specified. This is because a too-low value
1269 // will slow down scavenges.
1270 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1271 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1272 }
1273 }
1274 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1275 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1276 // If either of the static initialization defaults have changed, note this
1277 // modification.
1278 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1279 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1280 }
1281 if (PrintGCDetails && Verbose) {
1282 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1283 MarkStackSize / K, MarkStackSizeMax / K);
1284 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1285 }
1286 }
1287 #endif // INCLUDE_ALTERNATE_GCS
1289 void set_object_alignment() {
1290 // Object alignment.
1291 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1292 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1293 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1294 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1295 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1296 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1298 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1299 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1301 // Oop encoding heap max
1302 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1304 #if INCLUDE_ALTERNATE_GCS
1305 // Set CMS global values
1306 CompactibleFreeListSpace::set_cms_values();
1307 #endif // INCLUDE_ALTERNATE_GCS
1308 }
1310 bool verify_object_alignment() {
1311 // Object alignment.
1312 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1313 jio_fprintf(defaultStream::error_stream(),
1314 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1315 (int)ObjectAlignmentInBytes);
1316 return false;
1317 }
1318 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1319 jio_fprintf(defaultStream::error_stream(),
1320 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1321 (int)ObjectAlignmentInBytes, BytesPerLong);
1322 return false;
1323 }
1324 // It does not make sense to have big object alignment
1325 // since a space lost due to alignment will be greater
1326 // then a saved space from compressed oops.
1327 if ((int)ObjectAlignmentInBytes > 256) {
1328 jio_fprintf(defaultStream::error_stream(),
1329 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1330 (int)ObjectAlignmentInBytes);
1331 return false;
1332 }
1333 // In case page size is very small.
1334 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1335 jio_fprintf(defaultStream::error_stream(),
1336 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1337 (int)ObjectAlignmentInBytes, os::vm_page_size());
1338 return false;
1339 }
1340 return true;
1341 }
1343 inline uintx max_heap_for_compressed_oops() {
1344 // Avoid sign flip.
1345 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) {
1346 return 0;
1347 }
1348 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size());
1349 NOT_LP64(ShouldNotReachHere(); return 0);
1350 }
1352 bool Arguments::should_auto_select_low_pause_collector() {
1353 if (UseAutoGCSelectPolicy &&
1354 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1355 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1356 if (PrintGCDetails) {
1357 // Cannot use gclog_or_tty yet.
1358 tty->print_cr("Automatic selection of the low pause collector"
1359 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1360 }
1361 return true;
1362 }
1363 return false;
1364 }
1366 void Arguments::set_ergonomics_flags() {
1368 if (os::is_server_class_machine()) {
1369 // If no other collector is requested explicitly,
1370 // let the VM select the collector based on
1371 // machine class and automatic selection policy.
1372 if (!UseSerialGC &&
1373 !UseConcMarkSweepGC &&
1374 !UseG1GC &&
1375 !UseParNewGC &&
1376 FLAG_IS_DEFAULT(UseParallelGC)) {
1377 if (should_auto_select_low_pause_collector()) {
1378 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1379 } else {
1380 FLAG_SET_ERGO(bool, UseParallelGC, true);
1381 }
1382 }
1383 // Shared spaces work fine with other GCs but causes bytecode rewriting
1384 // to be disabled, which hurts interpreter performance and decreases
1385 // server performance. On server class machines, keep the default
1386 // off unless it is asked for. Future work: either add bytecode rewriting
1387 // at link time, or rewrite bytecodes in non-shared methods.
1388 if (!DumpSharedSpaces && !RequireSharedSpaces) {
1389 no_shared_spaces();
1390 }
1391 }
1393 #ifndef ZERO
1394 #ifdef _LP64
1395 // Check that UseCompressedOops can be set with the max heap size allocated
1396 // by ergonomics.
1397 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1398 #if !defined(COMPILER1) || defined(TIERED)
1399 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1400 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1401 }
1402 #endif
1403 #ifdef _WIN64
1404 if (UseLargePages && UseCompressedOops) {
1405 // Cannot allocate guard pages for implicit checks in indexed addressing
1406 // mode, when large pages are specified on windows.
1407 // This flag could be switched ON if narrow oop base address is set to 0,
1408 // see code in Universe::initialize_heap().
1409 Universe::set_narrow_oop_use_implicit_null_checks(false);
1410 }
1411 #endif // _WIN64
1412 } else {
1413 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1414 warning("Max heap size too large for Compressed Oops");
1415 FLAG_SET_DEFAULT(UseCompressedOops, false);
1416 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1417 }
1418 }
1419 // UseCompressedOops must be on for UseCompressedKlassPointers to be on.
1420 if (!UseCompressedOops) {
1421 if (UseCompressedKlassPointers) {
1422 warning("UseCompressedKlassPointers requires UseCompressedOops");
1423 }
1424 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1425 } else {
1426 // Turn on UseCompressedKlassPointers too
1427 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) {
1428 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true);
1429 }
1430 // Set the ClassMetaspaceSize to something that will not need to be
1431 // expanded, since it cannot be expanded.
1432 if (UseCompressedKlassPointers && FLAG_IS_DEFAULT(ClassMetaspaceSize)) {
1433 // 100,000 classes seems like a good size, so 100M assumes around 1K
1434 // per klass. The vtable and oopMap is embedded so we don't have a fixed
1435 // size per klass. Eventually, this will be parameterized because it
1436 // would also be useful to determine the optimal size of the
1437 // systemDictionary.
1438 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M);
1439 }
1440 }
1441 // Also checks that certain machines are slower with compressed oops
1442 // in vm_version initialization code.
1443 #endif // _LP64
1444 #endif // !ZERO
1445 }
1447 void Arguments::set_parallel_gc_flags() {
1448 assert(UseParallelGC || UseParallelOldGC, "Error");
1449 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1450 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1451 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1452 }
1453 FLAG_SET_DEFAULT(UseParallelGC, true);
1455 // If no heap maximum was requested explicitly, use some reasonable fraction
1456 // of the physical memory, up to a maximum of 1GB.
1457 FLAG_SET_DEFAULT(ParallelGCThreads,
1458 Abstract_VM_Version::parallel_worker_threads());
1459 if (ParallelGCThreads == 0) {
1460 jio_fprintf(defaultStream::error_stream(),
1461 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1462 vm_exit(1);
1463 }
1466 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1467 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1468 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1469 // See CR 6362902 for details.
1470 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1471 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1472 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1473 }
1474 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1475 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1476 }
1477 }
1479 if (UseParallelOldGC) {
1480 // Par compact uses lower default values since they are treated as
1481 // minimums. These are different defaults because of the different
1482 // interpretation and are not ergonomically set.
1483 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1484 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1485 }
1486 }
1487 }
1489 void Arguments::set_g1_gc_flags() {
1490 assert(UseG1GC, "Error");
1491 #ifdef COMPILER1
1492 FastTLABRefill = false;
1493 #endif
1494 FLAG_SET_DEFAULT(ParallelGCThreads,
1495 Abstract_VM_Version::parallel_worker_threads());
1496 if (ParallelGCThreads == 0) {
1497 FLAG_SET_DEFAULT(ParallelGCThreads,
1498 Abstract_VM_Version::parallel_worker_threads());
1499 }
1501 // MarkStackSize will be set (if it hasn't been set by the user)
1502 // when concurrent marking is initialized.
1503 // Its value will be based upon the number of parallel marking threads.
1504 // But we do set the maximum mark stack size here.
1505 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1506 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1507 }
1509 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1510 // In G1, we want the default GC overhead goal to be higher than
1511 // say in PS. So we set it here to 10%. Otherwise the heap might
1512 // be expanded more aggressively than we would like it to. In
1513 // fact, even 10% seems to not be high enough in some cases
1514 // (especially small GC stress tests that the main thing they do
1515 // is allocation). We might consider increase it further.
1516 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1517 }
1519 if (PrintGCDetails && Verbose) {
1520 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1521 MarkStackSize / K, MarkStackSizeMax / K);
1522 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1523 }
1524 }
1526 void Arguments::set_heap_size() {
1527 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1528 // Deprecated flag
1529 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1530 }
1532 const julong phys_mem =
1533 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1534 : (julong)MaxRAM;
1536 // If the maximum heap size has not been set with -Xmx,
1537 // then set it as fraction of the size of physical memory,
1538 // respecting the maximum and minimum sizes of the heap.
1539 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1540 julong reasonable_max = phys_mem / MaxRAMFraction;
1542 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1543 // Small physical memory, so use a minimum fraction of it for the heap
1544 reasonable_max = phys_mem / MinRAMFraction;
1545 } else {
1546 // Not-small physical memory, so require a heap at least
1547 // as large as MaxHeapSize
1548 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1549 }
1550 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1551 // Limit the heap size to ErgoHeapSizeLimit
1552 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1553 }
1554 if (UseCompressedOops) {
1555 // Limit the heap size to the maximum possible when using compressed oops
1556 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1557 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1558 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1559 // but it should be not less than default MaxHeapSize.
1560 max_coop_heap -= HeapBaseMinAddress;
1561 }
1562 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1563 }
1564 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1566 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1567 // An initial heap size was specified on the command line,
1568 // so be sure that the maximum size is consistent. Done
1569 // after call to allocatable_physical_memory because that
1570 // method might reduce the allocation size.
1571 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1572 }
1574 if (PrintGCDetails && Verbose) {
1575 // Cannot use gclog_or_tty yet.
1576 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1577 }
1578 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1579 }
1581 // If the initial_heap_size has not been set with InitialHeapSize
1582 // or -Xms, then set it as fraction of the size of physical memory,
1583 // respecting the maximum and minimum sizes of the heap.
1584 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1585 julong reasonable_minimum = (julong)(OldSize + NewSize);
1587 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1589 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1591 julong reasonable_initial = phys_mem / InitialRAMFraction;
1593 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1594 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1596 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1598 if (PrintGCDetails && Verbose) {
1599 // Cannot use gclog_or_tty yet.
1600 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1601 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1602 }
1603 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1604 set_min_heap_size((uintx)reasonable_minimum);
1605 }
1606 }
1608 // This must be called after ergonomics because we want bytecode rewriting
1609 // if the server compiler is used, or if UseSharedSpaces is disabled.
1610 void Arguments::set_bytecode_flags() {
1611 // Better not attempt to store into a read-only space.
1612 if (UseSharedSpaces) {
1613 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1614 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1615 }
1617 if (!RewriteBytecodes) {
1618 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1619 }
1620 }
1622 // Aggressive optimization flags -XX:+AggressiveOpts
1623 void Arguments::set_aggressive_opts_flags() {
1624 #ifdef COMPILER2
1625 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1626 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1627 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1628 }
1629 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1630 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1631 }
1633 // Feed the cache size setting into the JDK
1634 char buffer[1024];
1635 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1636 add_property(buffer);
1637 }
1638 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1639 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1640 }
1641 #endif
1643 if (AggressiveOpts) {
1644 // Sample flag setting code
1645 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1646 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1647 // }
1648 }
1649 }
1651 //===========================================================================================================
1652 // Parsing of java.compiler property
1654 void Arguments::process_java_compiler_argument(char* arg) {
1655 // For backwards compatibility, Djava.compiler=NONE or ""
1656 // causes us to switch to -Xint mode UNLESS -Xdebug
1657 // is also specified.
1658 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1659 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1660 }
1661 }
1663 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1664 _sun_java_launcher = strdup(launcher);
1665 if (strcmp("gamma", _sun_java_launcher) == 0) {
1666 _created_by_gamma_launcher = true;
1667 }
1668 }
1670 bool Arguments::created_by_java_launcher() {
1671 assert(_sun_java_launcher != NULL, "property must have value");
1672 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1673 }
1675 bool Arguments::created_by_gamma_launcher() {
1676 return _created_by_gamma_launcher;
1677 }
1679 //===========================================================================================================
1680 // Parsing of main arguments
1682 bool Arguments::verify_interval(uintx val, uintx min,
1683 uintx max, const char* name) {
1684 // Returns true iff value is in the inclusive interval [min..max]
1685 // false, otherwise.
1686 if (val >= min && val <= max) {
1687 return true;
1688 }
1689 jio_fprintf(defaultStream::error_stream(),
1690 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1691 " and " UINTX_FORMAT "\n",
1692 name, val, min, max);
1693 return false;
1694 }
1696 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1697 // Returns true if given value is at least specified min threshold
1698 // false, otherwise.
1699 if (val >= min ) {
1700 return true;
1701 }
1702 jio_fprintf(defaultStream::error_stream(),
1703 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1704 name, val, min);
1705 return false;
1706 }
1708 bool Arguments::verify_percentage(uintx value, const char* name) {
1709 if (value <= 100) {
1710 return true;
1711 }
1712 jio_fprintf(defaultStream::error_stream(),
1713 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1714 name, value);
1715 return false;
1716 }
1718 static void force_serial_gc() {
1719 FLAG_SET_DEFAULT(UseSerialGC, true);
1720 FLAG_SET_DEFAULT(UseParNewGC, false);
1721 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1722 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1723 FLAG_SET_DEFAULT(UseParallelGC, false);
1724 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1725 FLAG_SET_DEFAULT(UseG1GC, false);
1726 }
1728 static bool verify_serial_gc_flags() {
1729 return (UseSerialGC &&
1730 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1731 UseParallelGC || UseParallelOldGC));
1732 }
1734 // check if do gclog rotation
1735 // +UseGCLogFileRotation is a must,
1736 // no gc log rotation when log file not supplied or
1737 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1738 void check_gclog_consistency() {
1739 if (UseGCLogFileRotation) {
1740 if ((Arguments::gc_log_filename() == NULL) ||
1741 (NumberOfGCLogFiles == 0) ||
1742 (GCLogFileSize == 0)) {
1743 jio_fprintf(defaultStream::output_stream(),
1744 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1745 "where num_of_file > 0 and num_of_size > 0\n"
1746 "GC log rotation is turned off\n");
1747 UseGCLogFileRotation = false;
1748 }
1749 }
1751 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1752 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1753 jio_fprintf(defaultStream::output_stream(),
1754 "GCLogFileSize changed to minimum 8K\n");
1755 }
1756 }
1758 // Check consistency of GC selection
1759 bool Arguments::check_gc_consistency() {
1760 check_gclog_consistency();
1761 bool status = true;
1762 // Ensure that the user has not selected conflicting sets
1763 // of collectors. [Note: this check is merely a user convenience;
1764 // collectors over-ride each other so that only a non-conflicting
1765 // set is selected; however what the user gets is not what they
1766 // may have expected from the combination they asked for. It's
1767 // better to reduce user confusion by not allowing them to
1768 // select conflicting combinations.
1769 uint i = 0;
1770 if (UseSerialGC) i++;
1771 if (UseConcMarkSweepGC || UseParNewGC) i++;
1772 if (UseParallelGC || UseParallelOldGC) i++;
1773 if (UseG1GC) i++;
1774 if (i > 1) {
1775 jio_fprintf(defaultStream::error_stream(),
1776 "Conflicting collector combinations in option list; "
1777 "please refer to the release notes for the combinations "
1778 "allowed\n");
1779 status = false;
1780 }
1782 return status;
1783 }
1785 void Arguments::check_deprecated_gcs() {
1786 if (UseConcMarkSweepGC && !UseParNewGC) {
1787 warning("Using the DefNew young collector with the CMS collector is deprecated "
1788 "and will likely be removed in a future release");
1789 }
1791 if (UseParNewGC && !UseConcMarkSweepGC) {
1792 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1793 // set up UseSerialGC properly, so that can't be used in the check here.
1794 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1795 "and will likely be removed in a future release");
1796 }
1798 if (CMSIncrementalMode) {
1799 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1800 }
1801 }
1803 // Check stack pages settings
1804 bool Arguments::check_stack_pages()
1805 {
1806 bool status = true;
1807 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1808 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1809 // greater stack shadow pages can't generate instruction to bang stack
1810 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1811 return status;
1812 }
1814 // Check the consistency of vm_init_args
1815 bool Arguments::check_vm_args_consistency() {
1816 // Method for adding checks for flag consistency.
1817 // The intent is to warn the user of all possible conflicts,
1818 // before returning an error.
1819 // Note: Needs platform-dependent factoring.
1820 bool status = true;
1822 #if ( (defined(COMPILER2) && defined(SPARC)))
1823 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1824 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1825 // x86. Normally, VM_Version_init must be called from init_globals in
1826 // init.cpp, which is called by the initial java thread *after* arguments
1827 // have been parsed. VM_Version_init gets called twice on sparc.
1828 extern void VM_Version_init();
1829 VM_Version_init();
1830 if (!VM_Version::has_v9()) {
1831 jio_fprintf(defaultStream::error_stream(),
1832 "V8 Machine detected, Server requires V9\n");
1833 status = false;
1834 }
1835 #endif /* COMPILER2 && SPARC */
1837 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1838 // builds so the cost of stack banging can be measured.
1839 #if (defined(PRODUCT) && defined(SOLARIS))
1840 if (!UseBoundThreads && !UseStackBanging) {
1841 jio_fprintf(defaultStream::error_stream(),
1842 "-UseStackBanging conflicts with -UseBoundThreads\n");
1844 status = false;
1845 }
1846 #endif
1848 if (TLABRefillWasteFraction == 0) {
1849 jio_fprintf(defaultStream::error_stream(),
1850 "TLABRefillWasteFraction should be a denominator, "
1851 "not " SIZE_FORMAT "\n",
1852 TLABRefillWasteFraction);
1853 status = false;
1854 }
1856 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1857 "AdaptiveSizePolicyWeight");
1858 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1859 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1860 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1862 // Divide by bucket size to prevent a large size from causing rollover when
1863 // calculating amount of memory needed to be allocated for the String table.
1864 status = status && verify_interval(StringTableSize, defaultStringTableSize,
1865 (max_uintx / StringTable::bucket_size()), "StringTable size");
1867 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1868 jio_fprintf(defaultStream::error_stream(),
1869 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1870 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1871 MinHeapFreeRatio, MaxHeapFreeRatio);
1872 status = false;
1873 }
1874 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1875 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1877 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1878 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1879 }
1881 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1882 // Settings to encourage splitting.
1883 if (!FLAG_IS_CMDLINE(NewRatio)) {
1884 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1885 }
1886 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1887 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1888 }
1889 }
1891 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1892 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1893 if (GCTimeLimit == 100) {
1894 // Turn off gc-overhead-limit-exceeded checks
1895 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1896 }
1898 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1900 status = status && check_gc_consistency();
1901 status = status && check_stack_pages();
1903 if (_has_alloc_profile) {
1904 if (UseParallelGC || UseParallelOldGC) {
1905 jio_fprintf(defaultStream::error_stream(),
1906 "error: invalid argument combination.\n"
1907 "Allocation profiling (-Xaprof) cannot be used together with "
1908 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1909 status = false;
1910 }
1911 if (UseConcMarkSweepGC) {
1912 jio_fprintf(defaultStream::error_stream(),
1913 "error: invalid argument combination.\n"
1914 "Allocation profiling (-Xaprof) cannot be used together with "
1915 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1916 status = false;
1917 }
1918 }
1920 if (CMSIncrementalMode) {
1921 if (!UseConcMarkSweepGC) {
1922 jio_fprintf(defaultStream::error_stream(),
1923 "error: invalid argument combination.\n"
1924 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1925 "selected in order\nto use CMSIncrementalMode.\n");
1926 status = false;
1927 } else {
1928 status = status && verify_percentage(CMSIncrementalDutyCycle,
1929 "CMSIncrementalDutyCycle");
1930 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1931 "CMSIncrementalDutyCycleMin");
1932 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1933 "CMSIncrementalSafetyFactor");
1934 status = status && verify_percentage(CMSIncrementalOffset,
1935 "CMSIncrementalOffset");
1936 status = status && verify_percentage(CMSExpAvgFactor,
1937 "CMSExpAvgFactor");
1938 // If it was not set on the command line, set
1939 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1940 if (CMSInitiatingOccupancyFraction < 0) {
1941 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1942 }
1943 }
1944 }
1946 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1947 // insists that we hold the requisite locks so that the iteration is
1948 // MT-safe. For the verification at start-up and shut-down, we don't
1949 // yet have a good way of acquiring and releasing these locks,
1950 // which are not visible at the CollectedHeap level. We want to
1951 // be able to acquire these locks and then do the iteration rather
1952 // than just disable the lock verification. This will be fixed under
1953 // bug 4788986.
1954 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1955 if (VerifyGCStartAt == 0) {
1956 warning("Heap verification at start-up disabled "
1957 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1958 VerifyGCStartAt = 1; // Disable verification at start-up
1959 }
1960 if (VerifyBeforeExit) {
1961 warning("Heap verification at shutdown disabled "
1962 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1963 VerifyBeforeExit = false; // Disable verification at shutdown
1964 }
1965 }
1967 // Note: only executed in non-PRODUCT mode
1968 if (!UseAsyncConcMarkSweepGC &&
1969 (ExplicitGCInvokesConcurrent ||
1970 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1971 jio_fprintf(defaultStream::error_stream(),
1972 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1973 " with -UseAsyncConcMarkSweepGC");
1974 status = false;
1975 }
1977 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
1979 #ifndef SERIALGC
1980 if (UseG1GC) {
1981 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1982 "InitiatingHeapOccupancyPercent");
1983 status = status && verify_min_value(G1RefProcDrainInterval, 1,
1984 "G1RefProcDrainInterval");
1985 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
1986 "G1ConcMarkStepDurationMillis");
1987 }
1988 #endif
1990 status = status && verify_interval(RefDiscoveryPolicy,
1991 ReferenceProcessor::DiscoveryPolicyMin,
1992 ReferenceProcessor::DiscoveryPolicyMax,
1993 "RefDiscoveryPolicy");
1995 // Limit the lower bound of this flag to 1 as it is used in a division
1996 // expression.
1997 status = status && verify_interval(TLABWasteTargetPercent,
1998 1, 100, "TLABWasteTargetPercent");
2000 status = status && verify_object_alignment();
2002 status = status && verify_min_value(ClassMetaspaceSize, 1*M,
2003 "ClassMetaspaceSize");
2005 status = status && verify_interval(MarkStackSizeMax,
2006 1, (max_jint - 1), "MarkStackSizeMax");
2008 #ifdef SPARC
2009 if (UseConcMarkSweepGC || UseG1GC) {
2010 // Issue a stern warning if the user has explicitly set
2011 // UseMemSetInBOT (it is known to cause issues), but allow
2012 // use for experimentation and debugging.
2013 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2014 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2015 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2016 " on sun4v; please understand that you are using at your own risk!");
2017 }
2018 }
2019 #endif // SPARC
2021 if (PrintNMTStatistics) {
2022 #if INCLUDE_NMT
2023 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2024 #endif // INCLUDE_NMT
2025 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2026 PrintNMTStatistics = false;
2027 #if INCLUDE_NMT
2028 }
2029 #endif
2030 }
2032 return status;
2033 }
2035 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2036 const char* option_type) {
2037 if (ignore) return false;
2039 const char* spacer = " ";
2040 if (option_type == NULL) {
2041 option_type = ++spacer; // Set both to the empty string.
2042 }
2044 if (os::obsolete_option(option)) {
2045 jio_fprintf(defaultStream::error_stream(),
2046 "Obsolete %s%soption: %s\n", option_type, spacer,
2047 option->optionString);
2048 return false;
2049 } else {
2050 jio_fprintf(defaultStream::error_stream(),
2051 "Unrecognized %s%soption: %s\n", option_type, spacer,
2052 option->optionString);
2053 return true;
2054 }
2055 }
2057 static const char* user_assertion_options[] = {
2058 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2059 };
2061 static const char* system_assertion_options[] = {
2062 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2063 };
2065 // Return true if any of the strings in null-terminated array 'names' matches.
2066 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2067 // the option must match exactly.
2068 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2069 bool tail_allowed) {
2070 for (/* empty */; *names != NULL; ++names) {
2071 if (match_option(option, *names, tail)) {
2072 if (**tail == '\0' || tail_allowed && **tail == ':') {
2073 return true;
2074 }
2075 }
2076 }
2077 return false;
2078 }
2080 bool Arguments::parse_uintx(const char* value,
2081 uintx* uintx_arg,
2082 uintx min_size) {
2084 // Check the sign first since atomull() parses only unsigned values.
2085 bool value_is_positive = !(*value == '-');
2087 if (value_is_positive) {
2088 julong n;
2089 bool good_return = atomull(value, &n);
2090 if (good_return) {
2091 bool above_minimum = n >= min_size;
2092 bool value_is_too_large = n > max_uintx;
2094 if (above_minimum && !value_is_too_large) {
2095 *uintx_arg = n;
2096 return true;
2097 }
2098 }
2099 }
2100 return false;
2101 }
2103 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2104 julong* long_arg,
2105 julong min_size) {
2106 if (!atomull(s, long_arg)) return arg_unreadable;
2107 return check_memory_size(*long_arg, min_size);
2108 }
2110 // Parse JavaVMInitArgs structure
2112 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2113 // For components of the system classpath.
2114 SysClassPath scp(Arguments::get_sysclasspath());
2115 bool scp_assembly_required = false;
2117 // Save default settings for some mode flags
2118 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2119 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2120 Arguments::_ClipInlining = ClipInlining;
2121 Arguments::_BackgroundCompilation = BackgroundCompilation;
2123 // Setup flags for mixed which is the default
2124 set_mode_flags(_mixed);
2126 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2127 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2128 if (result != JNI_OK) {
2129 return result;
2130 }
2132 // Parse JavaVMInitArgs structure passed in
2133 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2134 if (result != JNI_OK) {
2135 return result;
2136 }
2138 if (AggressiveOpts) {
2139 // Insert alt-rt.jar between user-specified bootclasspath
2140 // prefix and the default bootclasspath. os::set_boot_path()
2141 // uses meta_index_dir as the default bootclasspath directory.
2142 const char* altclasses_jar = "alt-rt.jar";
2143 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2144 strlen(altclasses_jar);
2145 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2146 strcpy(altclasses_path, get_meta_index_dir());
2147 strcat(altclasses_path, altclasses_jar);
2148 scp.add_suffix_to_prefix(altclasses_path);
2149 scp_assembly_required = true;
2150 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2151 }
2153 if (WhiteBoxAPI) {
2154 // Append wb.jar to bootclasspath if enabled
2155 const char* wb_jar = "wb.jar";
2156 size_t wb_path_len = strlen(get_meta_index_dir()) + 1 +
2157 strlen(wb_jar);
2158 char* wb_path = NEW_C_HEAP_ARRAY(char, wb_path_len, mtInternal);
2159 strcpy(wb_path, get_meta_index_dir());
2160 strcat(wb_path, wb_jar);
2161 scp.add_suffix(wb_path);
2162 scp_assembly_required = true;
2163 FREE_C_HEAP_ARRAY(char, wb_path, mtInternal);
2164 }
2166 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2167 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2168 if (result != JNI_OK) {
2169 return result;
2170 }
2172 // Do final processing now that all arguments have been parsed
2173 result = finalize_vm_init_args(&scp, scp_assembly_required);
2174 if (result != JNI_OK) {
2175 return result;
2176 }
2178 return JNI_OK;
2179 }
2181 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2182 SysClassPath* scp_p,
2183 bool* scp_assembly_required_p,
2184 FlagValueOrigin origin) {
2185 // Remaining part of option string
2186 const char* tail;
2188 // iterate over arguments
2189 for (int index = 0; index < args->nOptions; index++) {
2190 bool is_absolute_path = false; // for -agentpath vs -agentlib
2192 const JavaVMOption* option = args->options + index;
2194 if (!match_option(option, "-Djava.class.path", &tail) &&
2195 !match_option(option, "-Dsun.java.command", &tail) &&
2196 !match_option(option, "-Dsun.java.launcher", &tail)) {
2198 // add all jvm options to the jvm_args string. This string
2199 // is used later to set the java.vm.args PerfData string constant.
2200 // the -Djava.class.path and the -Dsun.java.command options are
2201 // omitted from jvm_args string as each have their own PerfData
2202 // string constant object.
2203 build_jvm_args(option->optionString);
2204 }
2206 // -verbose:[class/gc/jni]
2207 if (match_option(option, "-verbose", &tail)) {
2208 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2209 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2210 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2211 } else if (!strcmp(tail, ":gc")) {
2212 FLAG_SET_CMDLINE(bool, PrintGC, true);
2213 } else if (!strcmp(tail, ":jni")) {
2214 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2215 }
2216 // -da / -ea / -disableassertions / -enableassertions
2217 // These accept an optional class/package name separated by a colon, e.g.,
2218 // -da:java.lang.Thread.
2219 } else if (match_option(option, user_assertion_options, &tail, true)) {
2220 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2221 if (*tail == '\0') {
2222 JavaAssertions::setUserClassDefault(enable);
2223 } else {
2224 assert(*tail == ':', "bogus match by match_option()");
2225 JavaAssertions::addOption(tail + 1, enable);
2226 }
2227 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2228 } else if (match_option(option, system_assertion_options, &tail, false)) {
2229 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2230 JavaAssertions::setSystemClassDefault(enable);
2231 // -bootclasspath:
2232 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2233 scp_p->reset_path(tail);
2234 *scp_assembly_required_p = true;
2235 // -bootclasspath/a:
2236 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2237 scp_p->add_suffix(tail);
2238 *scp_assembly_required_p = true;
2239 // -bootclasspath/p:
2240 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2241 scp_p->add_prefix(tail);
2242 *scp_assembly_required_p = true;
2243 // -Xrun
2244 } else if (match_option(option, "-Xrun", &tail)) {
2245 if (tail != NULL) {
2246 const char* pos = strchr(tail, ':');
2247 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2248 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2249 name[len] = '\0';
2251 char *options = NULL;
2252 if(pos != NULL) {
2253 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2254 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2255 }
2256 #if !INCLUDE_JVMTI
2257 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2258 warning("profiling and debugging agents are not supported in this VM");
2259 } else
2260 #endif // !INCLUDE_JVMTI
2261 add_init_library(name, options);
2262 }
2263 // -agentlib and -agentpath
2264 } else if (match_option(option, "-agentlib:", &tail) ||
2265 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2266 if(tail != NULL) {
2267 const char* pos = strchr(tail, '=');
2268 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2269 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2270 name[len] = '\0';
2272 char *options = NULL;
2273 if(pos != NULL) {
2274 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2275 }
2276 #if !INCLUDE_JVMTI
2277 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2278 warning("profiling and debugging agents are not supported in this VM");
2279 } else
2280 #endif // !INCLUDE_JVMTI
2281 add_init_agent(name, options, is_absolute_path);
2283 }
2284 // -javaagent
2285 } else if (match_option(option, "-javaagent:", &tail)) {
2286 #if !INCLUDE_JVMTI
2287 warning("Instrumentation agents are not supported in this VM");
2288 #else
2289 if(tail != NULL) {
2290 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2291 add_init_agent("instrument", options, false);
2292 }
2293 #endif // !INCLUDE_JVMTI
2294 // -Xnoclassgc
2295 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2296 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2297 // -Xincgc: i-CMS
2298 } else if (match_option(option, "-Xincgc", &tail)) {
2299 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2300 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2301 // -Xnoincgc: no i-CMS
2302 } else if (match_option(option, "-Xnoincgc", &tail)) {
2303 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2304 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2305 // -Xconcgc
2306 } else if (match_option(option, "-Xconcgc", &tail)) {
2307 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2308 // -Xnoconcgc
2309 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2310 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2311 // -Xbatch
2312 } else if (match_option(option, "-Xbatch", &tail)) {
2313 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2314 // -Xmn for compatibility with other JVM vendors
2315 } else if (match_option(option, "-Xmn", &tail)) {
2316 julong long_initial_eden_size = 0;
2317 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2318 if (errcode != arg_in_range) {
2319 jio_fprintf(defaultStream::error_stream(),
2320 "Invalid initial eden size: %s\n", option->optionString);
2321 describe_range_error(errcode);
2322 return JNI_EINVAL;
2323 }
2324 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2325 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2326 // -Xms
2327 } else if (match_option(option, "-Xms", &tail)) {
2328 julong long_initial_heap_size = 0;
2329 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2330 if (errcode != arg_in_range) {
2331 jio_fprintf(defaultStream::error_stream(),
2332 "Invalid initial heap size: %s\n", option->optionString);
2333 describe_range_error(errcode);
2334 return JNI_EINVAL;
2335 }
2336 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2337 // Currently the minimum size and the initial heap sizes are the same.
2338 set_min_heap_size(InitialHeapSize);
2339 // -Xmx
2340 } else if (match_option(option, "-Xmx", &tail)) {
2341 julong long_max_heap_size = 0;
2342 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2343 if (errcode != arg_in_range) {
2344 jio_fprintf(defaultStream::error_stream(),
2345 "Invalid maximum heap size: %s\n", option->optionString);
2346 describe_range_error(errcode);
2347 return JNI_EINVAL;
2348 }
2349 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2350 // Xmaxf
2351 } else if (match_option(option, "-Xmaxf", &tail)) {
2352 int maxf = (int)(atof(tail) * 100);
2353 if (maxf < 0 || maxf > 100) {
2354 jio_fprintf(defaultStream::error_stream(),
2355 "Bad max heap free percentage size: %s\n",
2356 option->optionString);
2357 return JNI_EINVAL;
2358 } else {
2359 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2360 }
2361 // Xminf
2362 } else if (match_option(option, "-Xminf", &tail)) {
2363 int minf = (int)(atof(tail) * 100);
2364 if (minf < 0 || minf > 100) {
2365 jio_fprintf(defaultStream::error_stream(),
2366 "Bad min heap free percentage size: %s\n",
2367 option->optionString);
2368 return JNI_EINVAL;
2369 } else {
2370 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2371 }
2372 // -Xss
2373 } else if (match_option(option, "-Xss", &tail)) {
2374 julong long_ThreadStackSize = 0;
2375 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2376 if (errcode != arg_in_range) {
2377 jio_fprintf(defaultStream::error_stream(),
2378 "Invalid thread stack size: %s\n", option->optionString);
2379 describe_range_error(errcode);
2380 return JNI_EINVAL;
2381 }
2382 // Internally track ThreadStackSize in units of 1024 bytes.
2383 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2384 round_to((int)long_ThreadStackSize, K) / K);
2385 // -Xoss
2386 } else if (match_option(option, "-Xoss", &tail)) {
2387 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2388 // -Xmaxjitcodesize
2389 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2390 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2391 julong long_ReservedCodeCacheSize = 0;
2392 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2393 (size_t)InitialCodeCacheSize);
2394 if (errcode != arg_in_range) {
2395 jio_fprintf(defaultStream::error_stream(),
2396 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2397 option->optionString, InitialCodeCacheSize/K);
2398 describe_range_error(errcode);
2399 return JNI_EINVAL;
2400 }
2401 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2402 // -green
2403 } else if (match_option(option, "-green", &tail)) {
2404 jio_fprintf(defaultStream::error_stream(),
2405 "Green threads support not available\n");
2406 return JNI_EINVAL;
2407 // -native
2408 } else if (match_option(option, "-native", &tail)) {
2409 // HotSpot always uses native threads, ignore silently for compatibility
2410 // -Xsqnopause
2411 } else if (match_option(option, "-Xsqnopause", &tail)) {
2412 // EVM option, ignore silently for compatibility
2413 // -Xrs
2414 } else if (match_option(option, "-Xrs", &tail)) {
2415 // Classic/EVM option, new functionality
2416 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2417 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2418 // change default internal VM signals used - lower case for back compat
2419 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2420 // -Xoptimize
2421 } else if (match_option(option, "-Xoptimize", &tail)) {
2422 // EVM option, ignore silently for compatibility
2423 // -Xprof
2424 } else if (match_option(option, "-Xprof", &tail)) {
2425 #if INCLUDE_FPROF
2426 _has_profile = true;
2427 #else // INCLUDE_FPROF
2428 // do we have to exit?
2429 warning("Flat profiling is not supported in this VM.");
2430 #endif // INCLUDE_FPROF
2431 // -Xaprof
2432 } else if (match_option(option, "-Xaprof", &tail)) {
2433 _has_alloc_profile = true;
2434 // -Xconcurrentio
2435 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2436 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2437 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2438 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2439 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2440 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2442 // -Xinternalversion
2443 } else if (match_option(option, "-Xinternalversion", &tail)) {
2444 jio_fprintf(defaultStream::output_stream(), "%s\n",
2445 VM_Version::internal_vm_info_string());
2446 vm_exit(0);
2447 #ifndef PRODUCT
2448 // -Xprintflags
2449 } else if (match_option(option, "-Xprintflags", &tail)) {
2450 CommandLineFlags::printFlags(tty, false);
2451 vm_exit(0);
2452 #endif
2453 // -D
2454 } else if (match_option(option, "-D", &tail)) {
2455 if (!add_property(tail)) {
2456 return JNI_ENOMEM;
2457 }
2458 // Out of the box management support
2459 if (match_option(option, "-Dcom.sun.management", &tail)) {
2460 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2461 }
2462 // -Xint
2463 } else if (match_option(option, "-Xint", &tail)) {
2464 set_mode_flags(_int);
2465 // -Xmixed
2466 } else if (match_option(option, "-Xmixed", &tail)) {
2467 set_mode_flags(_mixed);
2468 // -Xcomp
2469 } else if (match_option(option, "-Xcomp", &tail)) {
2470 // for testing the compiler; turn off all flags that inhibit compilation
2471 set_mode_flags(_comp);
2473 // -Xshare:dump
2474 } else if (match_option(option, "-Xshare:dump", &tail)) {
2475 #if !INCLUDE_CDS
2476 vm_exit_during_initialization(
2477 "Dumping a shared archive is not supported in this VM.", NULL);
2478 #else
2479 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2480 set_mode_flags(_int); // Prevent compilation, which creates objects
2481 #endif
2482 // -Xshare:on
2483 } else if (match_option(option, "-Xshare:on", &tail)) {
2484 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2485 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2486 // -Xshare:auto
2487 } else if (match_option(option, "-Xshare:auto", &tail)) {
2488 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2489 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2490 // -Xshare:off
2491 } else if (match_option(option, "-Xshare:off", &tail)) {
2492 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2493 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2495 // -Xverify
2496 } else if (match_option(option, "-Xverify", &tail)) {
2497 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2498 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2499 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2500 } else if (strcmp(tail, ":remote") == 0) {
2501 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2502 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2503 } else if (strcmp(tail, ":none") == 0) {
2504 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2505 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2506 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2507 return JNI_EINVAL;
2508 }
2509 // -Xdebug
2510 } else if (match_option(option, "-Xdebug", &tail)) {
2511 // note this flag has been used, then ignore
2512 set_xdebug_mode(true);
2513 // -Xnoagent
2514 } else if (match_option(option, "-Xnoagent", &tail)) {
2515 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2516 } else if (match_option(option, "-Xboundthreads", &tail)) {
2517 // Bind user level threads to kernel threads (Solaris only)
2518 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2519 } else if (match_option(option, "-Xloggc:", &tail)) {
2520 // Redirect GC output to the file. -Xloggc:<filename>
2521 // ostream_init_log(), when called will use this filename
2522 // to initialize a fileStream.
2523 _gc_log_filename = strdup(tail);
2524 FLAG_SET_CMDLINE(bool, PrintGC, true);
2525 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2527 // JNI hooks
2528 } else if (match_option(option, "-Xcheck", &tail)) {
2529 if (!strcmp(tail, ":jni")) {
2530 #if !INCLUDE_JNI_CHECK
2531 warning("JNI CHECKING is not supported in this VM");
2532 #else
2533 CheckJNICalls = true;
2534 #endif // INCLUDE_JNI_CHECK
2535 } else if (is_bad_option(option, args->ignoreUnrecognized,
2536 "check")) {
2537 return JNI_EINVAL;
2538 }
2539 } else if (match_option(option, "vfprintf", &tail)) {
2540 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2541 } else if (match_option(option, "exit", &tail)) {
2542 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2543 } else if (match_option(option, "abort", &tail)) {
2544 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2545 // -XX:+AggressiveHeap
2546 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2548 // This option inspects the machine and attempts to set various
2549 // parameters to be optimal for long-running, memory allocation
2550 // intensive jobs. It is intended for machines with large
2551 // amounts of cpu and memory.
2553 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2554 // VM, but we may not be able to represent the total physical memory
2555 // available (like having 8gb of memory on a box but using a 32bit VM).
2556 // Thus, we need to make sure we're using a julong for intermediate
2557 // calculations.
2558 julong initHeapSize;
2559 julong total_memory = os::physical_memory();
2561 if (total_memory < (julong)256*M) {
2562 jio_fprintf(defaultStream::error_stream(),
2563 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2564 vm_exit(1);
2565 }
2567 // The heap size is half of available memory, or (at most)
2568 // all of possible memory less 160mb (leaving room for the OS
2569 // when using ISM). This is the maximum; because adaptive sizing
2570 // is turned on below, the actual space used may be smaller.
2572 initHeapSize = MIN2(total_memory / (julong)2,
2573 total_memory - (julong)160*M);
2575 // Make sure that if we have a lot of memory we cap the 32 bit
2576 // process space. The 64bit VM version of this function is a nop.
2577 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2579 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2580 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2581 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2582 // Currently the minimum size and the initial heap sizes are the same.
2583 set_min_heap_size(initHeapSize);
2584 }
2585 if (FLAG_IS_DEFAULT(NewSize)) {
2586 // Make the young generation 3/8ths of the total heap.
2587 FLAG_SET_CMDLINE(uintx, NewSize,
2588 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2589 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2590 }
2592 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2593 FLAG_SET_DEFAULT(UseLargePages, true);
2594 #endif
2596 // Increase some data structure sizes for efficiency
2597 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2598 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2599 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2601 // See the OldPLABSize comment below, but replace 'after promotion'
2602 // with 'after copying'. YoungPLABSize is the size of the survivor
2603 // space per-gc-thread buffers. The default is 4kw.
2604 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2606 // OldPLABSize is the size of the buffers in the old gen that
2607 // UseParallelGC uses to promote live data that doesn't fit in the
2608 // survivor spaces. At any given time, there's one for each gc thread.
2609 // The default size is 1kw. These buffers are rarely used, since the
2610 // survivor spaces are usually big enough. For specjbb, however, there
2611 // are occasions when there's lots of live data in the young gen
2612 // and we end up promoting some of it. We don't have a definite
2613 // explanation for why bumping OldPLABSize helps, but the theory
2614 // is that a bigger PLAB results in retaining something like the
2615 // original allocation order after promotion, which improves mutator
2616 // locality. A minor effect may be that larger PLABs reduce the
2617 // number of PLAB allocation events during gc. The value of 8kw
2618 // was arrived at by experimenting with specjbb.
2619 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2621 // Enable parallel GC and adaptive generation sizing
2622 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2623 FLAG_SET_DEFAULT(ParallelGCThreads,
2624 Abstract_VM_Version::parallel_worker_threads());
2626 // Encourage steady state memory management
2627 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2629 // This appears to improve mutator locality
2630 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2632 // Get around early Solaris scheduling bug
2633 // (affinity vs other jobs on system)
2634 // but disallow DR and offlining (5008695).
2635 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2637 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2638 // The last option must always win.
2639 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2640 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2641 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2642 // The last option must always win.
2643 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2644 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2645 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2646 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2647 jio_fprintf(defaultStream::error_stream(),
2648 "Please use CMSClassUnloadingEnabled in place of "
2649 "CMSPermGenSweepingEnabled in the future\n");
2650 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2651 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2652 jio_fprintf(defaultStream::error_stream(),
2653 "Please use -XX:+UseGCOverheadLimit in place of "
2654 "-XX:+UseGCTimeLimit in the future\n");
2655 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2656 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2657 jio_fprintf(defaultStream::error_stream(),
2658 "Please use -XX:-UseGCOverheadLimit in place of "
2659 "-XX:-UseGCTimeLimit in the future\n");
2660 // The TLE options are for compatibility with 1.3 and will be
2661 // removed without notice in a future release. These options
2662 // are not to be documented.
2663 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2664 // No longer used.
2665 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2666 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2667 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2668 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2669 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2670 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2671 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2672 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2673 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2674 // No longer used.
2675 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2676 julong long_tlab_size = 0;
2677 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2678 if (errcode != arg_in_range) {
2679 jio_fprintf(defaultStream::error_stream(),
2680 "Invalid TLAB size: %s\n", option->optionString);
2681 describe_range_error(errcode);
2682 return JNI_EINVAL;
2683 }
2684 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2685 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2686 // No longer used.
2687 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2688 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2689 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2690 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2691 SOLARIS_ONLY(
2692 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2693 warning("-XX:+UsePermISM is obsolete.");
2694 FLAG_SET_CMDLINE(bool, UseISM, true);
2695 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2696 FLAG_SET_CMDLINE(bool, UseISM, false);
2697 )
2698 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2699 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2700 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2701 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2702 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2703 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2704 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2705 #if defined(DTRACE_ENABLED)
2706 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2707 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2708 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2709 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2710 #else // defined(DTRACE_ENABLED)
2711 jio_fprintf(defaultStream::error_stream(),
2712 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2713 return JNI_EINVAL;
2714 #endif // defined(DTRACE_ENABLED)
2715 #ifdef ASSERT
2716 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2717 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2718 // disable scavenge before parallel mark-compact
2719 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2720 #endif
2721 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2722 julong cms_blocks_to_claim = (julong)atol(tail);
2723 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2724 jio_fprintf(defaultStream::error_stream(),
2725 "Please use -XX:OldPLABSize in place of "
2726 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2727 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2728 julong cms_blocks_to_claim = (julong)atol(tail);
2729 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2730 jio_fprintf(defaultStream::error_stream(),
2731 "Please use -XX:OldPLABSize in place of "
2732 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2733 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2734 julong old_plab_size = 0;
2735 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2736 if (errcode != arg_in_range) {
2737 jio_fprintf(defaultStream::error_stream(),
2738 "Invalid old PLAB size: %s\n", option->optionString);
2739 describe_range_error(errcode);
2740 return JNI_EINVAL;
2741 }
2742 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2743 jio_fprintf(defaultStream::error_stream(),
2744 "Please use -XX:OldPLABSize in place of "
2745 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2746 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2747 julong young_plab_size = 0;
2748 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2749 if (errcode != arg_in_range) {
2750 jio_fprintf(defaultStream::error_stream(),
2751 "Invalid young PLAB size: %s\n", option->optionString);
2752 describe_range_error(errcode);
2753 return JNI_EINVAL;
2754 }
2755 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2756 jio_fprintf(defaultStream::error_stream(),
2757 "Please use -XX:YoungPLABSize in place of "
2758 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2759 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2760 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2761 julong stack_size = 0;
2762 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2763 if (errcode != arg_in_range) {
2764 jio_fprintf(defaultStream::error_stream(),
2765 "Invalid mark stack size: %s\n", option->optionString);
2766 describe_range_error(errcode);
2767 return JNI_EINVAL;
2768 }
2769 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2770 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2771 julong max_stack_size = 0;
2772 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2773 if (errcode != arg_in_range) {
2774 jio_fprintf(defaultStream::error_stream(),
2775 "Invalid maximum mark stack size: %s\n",
2776 option->optionString);
2777 describe_range_error(errcode);
2778 return JNI_EINVAL;
2779 }
2780 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2781 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2782 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2783 uintx conc_threads = 0;
2784 if (!parse_uintx(tail, &conc_threads, 1)) {
2785 jio_fprintf(defaultStream::error_stream(),
2786 "Invalid concurrent threads: %s\n", option->optionString);
2787 return JNI_EINVAL;
2788 }
2789 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2790 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
2791 julong max_direct_memory_size = 0;
2792 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
2793 if (errcode != arg_in_range) {
2794 jio_fprintf(defaultStream::error_stream(),
2795 "Invalid maximum direct memory size: %s\n",
2796 option->optionString);
2797 describe_range_error(errcode);
2798 return JNI_EINVAL;
2799 }
2800 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
2801 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
2802 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
2803 // away and will cause VM initialization failures!
2804 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
2805 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
2806 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2807 // Skip -XX:Flags= since that case has already been handled
2808 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2809 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2810 return JNI_EINVAL;
2811 }
2812 }
2813 // Unknown option
2814 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2815 return JNI_ERR;
2816 }
2817 }
2819 // Change the default value for flags which have different default values
2820 // when working with older JDKs.
2821 #ifdef LINUX
2822 if (JDK_Version::current().compare_major(6) <= 0 &&
2823 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2824 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2825 }
2826 #endif // LINUX
2827 return JNI_OK;
2828 }
2830 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2831 // This must be done after all -D arguments have been processed.
2832 scp_p->expand_endorsed();
2834 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2835 // Assemble the bootclasspath elements into the final path.
2836 Arguments::set_sysclasspath(scp_p->combined_path());
2837 }
2839 // This must be done after all arguments have been processed.
2840 // java_compiler() true means set to "NONE" or empty.
2841 if (java_compiler() && !xdebug_mode()) {
2842 // For backwards compatibility, we switch to interpreted mode if
2843 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2844 // not specified.
2845 set_mode_flags(_int);
2846 }
2847 if (CompileThreshold == 0) {
2848 set_mode_flags(_int);
2849 }
2851 #ifndef COMPILER2
2852 // Don't degrade server performance for footprint
2853 if (FLAG_IS_DEFAULT(UseLargePages) &&
2854 MaxHeapSize < LargePageHeapSizeThreshold) {
2855 // No need for large granularity pages w/small heaps.
2856 // Note that large pages are enabled/disabled for both the
2857 // Java heap and the code cache.
2858 FLAG_SET_DEFAULT(UseLargePages, false);
2859 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2860 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2861 }
2863 // Tiered compilation is undefined with C1.
2864 TieredCompilation = false;
2865 #else
2866 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2867 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2868 }
2869 #endif
2871 // If we are running in a headless jre, force java.awt.headless property
2872 // to be true unless the property has already been set.
2873 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2874 if (os::is_headless_jre()) {
2875 const char* headless = Arguments::get_property("java.awt.headless");
2876 if (headless == NULL) {
2877 char envbuffer[128];
2878 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2879 if (!add_property("java.awt.headless=true")) {
2880 return JNI_ENOMEM;
2881 }
2882 } else {
2883 char buffer[256];
2884 strcpy(buffer, "java.awt.headless=");
2885 strcat(buffer, envbuffer);
2886 if (!add_property(buffer)) {
2887 return JNI_ENOMEM;
2888 }
2889 }
2890 }
2891 }
2893 if (!check_vm_args_consistency()) {
2894 return JNI_ERR;
2895 }
2897 return JNI_OK;
2898 }
2900 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2901 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2902 scp_assembly_required_p);
2903 }
2905 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2906 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2907 scp_assembly_required_p);
2908 }
2910 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2911 const int N_MAX_OPTIONS = 64;
2912 const int OPTION_BUFFER_SIZE = 1024;
2913 char buffer[OPTION_BUFFER_SIZE];
2915 // The variable will be ignored if it exceeds the length of the buffer.
2916 // Don't check this variable if user has special privileges
2917 // (e.g. unix su command).
2918 if (os::getenv(name, buffer, sizeof(buffer)) &&
2919 !os::have_special_privileges()) {
2920 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2921 jio_fprintf(defaultStream::error_stream(),
2922 "Picked up %s: %s\n", name, buffer);
2923 char* rd = buffer; // pointer to the input string (rd)
2924 int i;
2925 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2926 while (isspace(*rd)) rd++; // skip whitespace
2927 if (*rd == 0) break; // we re done when the input string is read completely
2929 // The output, option string, overwrites the input string.
2930 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2931 // input string (rd).
2932 char* wrt = rd;
2934 options[i++].optionString = wrt; // Fill in option
2935 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2936 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2937 int quote = *rd; // matching quote to look for
2938 rd++; // don't copy open quote
2939 while (*rd != quote) { // include everything (even spaces) up until quote
2940 if (*rd == 0) { // string termination means unmatched string
2941 jio_fprintf(defaultStream::error_stream(),
2942 "Unmatched quote in %s\n", name);
2943 return JNI_ERR;
2944 }
2945 *wrt++ = *rd++; // copy to option string
2946 }
2947 rd++; // don't copy close quote
2948 } else {
2949 *wrt++ = *rd++; // copy to option string
2950 }
2951 }
2952 // Need to check if we're done before writing a NULL,
2953 // because the write could be to the byte that rd is pointing to.
2954 if (*rd++ == 0) {
2955 *wrt = 0;
2956 break;
2957 }
2958 *wrt = 0; // Zero terminate option
2959 }
2960 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2961 JavaVMInitArgs vm_args;
2962 vm_args.version = JNI_VERSION_1_2;
2963 vm_args.options = options;
2964 vm_args.nOptions = i;
2965 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2967 if (PrintVMOptions) {
2968 const char* tail;
2969 for (int i = 0; i < vm_args.nOptions; i++) {
2970 const JavaVMOption *option = vm_args.options + i;
2971 if (match_option(option, "-XX:", &tail)) {
2972 logOption(tail);
2973 }
2974 }
2975 }
2977 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2978 }
2979 return JNI_OK;
2980 }
2982 void Arguments::set_shared_spaces_flags() {
2983 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
2984 const bool might_share = must_share || UseSharedSpaces;
2986 // CompressedOops cannot be used with CDS. The offsets of oopmaps and
2987 // static fields are incorrect in the archive. With some more clever
2988 // initialization, this restriction can probably be lifted.
2989 // ??? UseLargePages might be okay now
2990 const bool cannot_share = UseCompressedOops ||
2991 (UseLargePages && FLAG_IS_CMDLINE(UseLargePages));
2992 if (cannot_share) {
2993 if (must_share) {
2994 warning("disabling large pages %s"
2995 "because of %s", "" LP64_ONLY("and compressed oops "),
2996 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
2997 FLAG_SET_CMDLINE(bool, UseLargePages, false);
2998 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
2999 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false));
3000 } else {
3001 // Prefer compressed oops and large pages to class data sharing
3002 if (UseSharedSpaces && Verbose) {
3003 warning("turning off use of shared archive because of large pages%s",
3004 "" LP64_ONLY(" and/or compressed oops"));
3005 }
3006 no_shared_spaces();
3007 }
3008 } else if (UseLargePages && might_share) {
3009 // Disable large pages to allow shared spaces. This is sub-optimal, since
3010 // there may not even be a shared archive to use.
3011 FLAG_SET_DEFAULT(UseLargePages, false);
3012 }
3014 if (DumpSharedSpaces) {
3015 if (RequireSharedSpaces) {
3016 warning("cannot dump shared archive while using shared archive");
3017 }
3018 UseSharedSpaces = false;
3019 }
3020 }
3022 // Disable options not supported in this release, with a warning if they
3023 // were explicitly requested on the command-line
3024 #define UNSUPPORTED_OPTION(opt, description) \
3025 do { \
3026 if (opt) { \
3027 if (FLAG_IS_CMDLINE(opt)) { \
3028 warning(description " is disabled in this release."); \
3029 } \
3030 FLAG_SET_DEFAULT(opt, false); \
3031 } \
3032 } while(0)
3034 // Parse entry point called from JNI_CreateJavaVM
3036 jint Arguments::parse(const JavaVMInitArgs* args) {
3038 // Sharing support
3039 // Construct the path to the archive
3040 char jvm_path[JVM_MAXPATHLEN];
3041 os::jvm_path(jvm_path, sizeof(jvm_path));
3042 char *end = strrchr(jvm_path, *os::file_separator());
3043 if (end != NULL) *end = '\0';
3044 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
3045 strlen(os::file_separator()) + 20, mtInternal);
3046 if (shared_archive_path == NULL) return JNI_ENOMEM;
3047 strcpy(shared_archive_path, jvm_path);
3048 strcat(shared_archive_path, os::file_separator());
3049 strcat(shared_archive_path, "classes");
3050 strcat(shared_archive_path, ".jsa");
3051 SharedArchivePath = shared_archive_path;
3053 // Remaining part of option string
3054 const char* tail;
3056 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3057 const char* hotspotrc = ".hotspotrc";
3058 bool settings_file_specified = false;
3059 bool needs_hotspotrc_warning = false;
3061 const char* flags_file;
3062 int index;
3063 for (index = 0; index < args->nOptions; index++) {
3064 const JavaVMOption *option = args->options + index;
3065 if (match_option(option, "-XX:Flags=", &tail)) {
3066 flags_file = tail;
3067 settings_file_specified = true;
3068 }
3069 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3070 PrintVMOptions = true;
3071 }
3072 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3073 PrintVMOptions = false;
3074 }
3075 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3076 IgnoreUnrecognizedVMOptions = true;
3077 }
3078 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3079 IgnoreUnrecognizedVMOptions = false;
3080 }
3081 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3082 CommandLineFlags::printFlags(tty, false);
3083 vm_exit(0);
3084 }
3085 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3086 #if INCLUDE_NMT
3087 MemTracker::init_tracking_options(tail);
3088 #else
3089 warning("Native Memory Tracking is not supported in this VM");
3090 #endif
3091 }
3094 #ifndef PRODUCT
3095 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3096 CommandLineFlags::printFlags(tty, true);
3097 vm_exit(0);
3098 }
3099 #endif
3100 }
3102 if (IgnoreUnrecognizedVMOptions) {
3103 // uncast const to modify the flag args->ignoreUnrecognized
3104 *(jboolean*)(&args->ignoreUnrecognized) = true;
3105 }
3107 // Parse specified settings file
3108 if (settings_file_specified) {
3109 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3110 return JNI_EINVAL;
3111 }
3112 } else {
3113 #ifdef ASSERT
3114 // Parse default .hotspotrc settings file
3115 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3116 return JNI_EINVAL;
3117 }
3118 #else
3119 struct stat buf;
3120 if (os::stat(hotspotrc, &buf) == 0) {
3121 needs_hotspotrc_warning = true;
3122 }
3123 #endif
3124 }
3126 if (PrintVMOptions) {
3127 for (index = 0; index < args->nOptions; index++) {
3128 const JavaVMOption *option = args->options + index;
3129 if (match_option(option, "-XX:", &tail)) {
3130 logOption(tail);
3131 }
3132 }
3133 }
3135 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3136 jint result = parse_vm_init_args(args);
3137 if (result != JNI_OK) {
3138 return result;
3139 }
3141 // Delay warning until here so that we've had a chance to process
3142 // the -XX:-PrintWarnings flag
3143 if (needs_hotspotrc_warning) {
3144 warning("%s file is present but has been ignored. "
3145 "Run with -XX:Flags=%s to load the file.",
3146 hotspotrc, hotspotrc);
3147 }
3149 #if (defined JAVASE_EMBEDDED || defined ARM)
3150 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3151 #endif
3153 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3154 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3155 #endif
3157 #if !INCLUDE_ALTERNATE_GCS
3158 if (UseParallelGC) {
3159 warning("Parallel GC is not supported in this VM. Using Serial GC.");
3160 }
3161 if (UseParallelOldGC) {
3162 warning("Parallel Old GC is not supported in this VM. Using Serial GC.");
3163 }
3164 if (UseConcMarkSweepGC) {
3165 warning("Concurrent Mark Sweep GC is not supported in this VM. Using Serial GC.");
3166 }
3167 if (UseParNewGC) {
3168 warning("Par New GC is not supported in this VM. Using Serial GC.");
3169 }
3170 #endif // INCLUDE_ALTERNATE_GCS
3172 #ifndef PRODUCT
3173 if (TraceBytecodesAt != 0) {
3174 TraceBytecodes = true;
3175 }
3176 if (CountCompiledCalls) {
3177 if (UseCounterDecay) {
3178 warning("UseCounterDecay disabled because CountCalls is set");
3179 UseCounterDecay = false;
3180 }
3181 }
3182 #endif // PRODUCT
3184 // JSR 292 is not supported before 1.7
3185 if (!JDK_Version::is_gte_jdk17x_version()) {
3186 if (EnableInvokeDynamic) {
3187 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3188 warning("JSR 292 is not supported before 1.7. Disabling support.");
3189 }
3190 EnableInvokeDynamic = false;
3191 }
3192 }
3194 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3195 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3196 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3197 }
3198 ScavengeRootsInCode = 1;
3199 }
3201 if (PrintGCDetails) {
3202 // Turn on -verbose:gc options as well
3203 PrintGC = true;
3204 }
3206 if (!JDK_Version::is_gte_jdk18x_version()) {
3207 // To avoid changing the log format for 7 updates this flag is only
3208 // true by default in JDK8 and above.
3209 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3210 FLAG_SET_DEFAULT(PrintGCCause, false);
3211 }
3212 }
3214 // Set object alignment values.
3215 set_object_alignment();
3217 #ifdef SERIALGC
3218 force_serial_gc();
3219 #endif // SERIALGC
3220 #if !INCLUDE_CDS
3221 no_shared_spaces();
3222 #endif // INCLUDE_CDS
3224 // Set flags based on ergonomics.
3225 set_ergonomics_flags();
3227 set_shared_spaces_flags();
3229 // Check the GC selections again.
3230 if (!check_gc_consistency()) {
3231 return JNI_EINVAL;
3232 }
3234 if (TieredCompilation) {
3235 set_tiered_flags();
3236 } else {
3237 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3238 if (CompilationPolicyChoice >= 2) {
3239 vm_exit_during_initialization(
3240 "Incompatible compilation policy selected", NULL);
3241 }
3242 }
3244 // Set heap size based on available physical memory
3245 set_heap_size();
3247 #if INCLUDE_ALTERNATE_GCS
3248 // Set per-collector flags
3249 if (UseParallelGC || UseParallelOldGC) {
3250 set_parallel_gc_flags();
3251 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3252 set_cms_and_parnew_gc_flags();
3253 } else if (UseParNewGC) { // skipped if CMS is set above
3254 set_parnew_gc_flags();
3255 } else if (UseG1GC) {
3256 set_g1_gc_flags();
3257 }
3258 check_deprecated_gcs();
3259 #endif // INCLUDE_ALTERNATE_GCS
3261 #ifdef SERIALGC
3262 assert(verify_serial_gc_flags(), "SerialGC unset");
3263 #endif // SERIALGC
3265 // Set bytecode rewriting flags
3266 set_bytecode_flags();
3268 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3269 set_aggressive_opts_flags();
3271 // Turn off biased locking for locking debug mode flags,
3272 // which are subtlely different from each other but neither works with
3273 // biased locking.
3274 if (UseHeavyMonitors
3275 #ifdef COMPILER1
3276 || !UseFastLocking
3277 #endif // COMPILER1
3278 ) {
3279 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3280 // flag set to true on command line; warn the user that they
3281 // can't enable biased locking here
3282 warning("Biased Locking is not supported with locking debug flags"
3283 "; ignoring UseBiasedLocking flag." );
3284 }
3285 UseBiasedLocking = false;
3286 }
3288 #ifdef CC_INTERP
3289 // Clear flags not supported by the C++ interpreter
3290 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3291 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3292 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3293 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
3294 #endif // CC_INTERP
3296 #ifdef COMPILER2
3297 if (!UseBiasedLocking || EmitSync != 0) {
3298 UseOptoBiasInlining = false;
3299 }
3300 if (!EliminateLocks) {
3301 EliminateNestedLocks = false;
3302 }
3303 if (!Inline) {
3304 IncrementalInline = false;
3305 }
3306 #ifndef PRODUCT
3307 if (!IncrementalInline) {
3308 AlwaysIncrementalInline = false;
3309 }
3310 #endif
3311 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3312 // incremental inlining: bump MaxNodeLimit
3313 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3314 }
3315 #endif
3317 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3318 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3319 DebugNonSafepoints = true;
3320 }
3322 #ifndef PRODUCT
3323 if (CompileTheWorld) {
3324 // Force NmethodSweeper to sweep whole CodeCache each time.
3325 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3326 NmethodSweepFraction = 1;
3327 }
3328 }
3329 #endif
3331 if (PrintCommandLineFlags) {
3332 CommandLineFlags::printSetFlags(tty);
3333 }
3335 // Apply CPU specific policy for the BiasedLocking
3336 if (UseBiasedLocking) {
3337 if (!VM_Version::use_biased_locking() &&
3338 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3339 UseBiasedLocking = false;
3340 }
3341 }
3343 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3344 // but only if not already set on the commandline
3345 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3346 bool set = false;
3347 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3348 if (!set) {
3349 FLAG_SET_DEFAULT(PauseAtExit, true);
3350 }
3351 }
3353 return JNI_OK;
3354 }
3356 jint Arguments::adjust_after_os() {
3357 #if INCLUDE_ALTERNATE_GCS
3358 if (UseParallelGC || UseParallelOldGC) {
3359 if (UseNUMA) {
3360 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3361 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3362 }
3363 // For those collectors or operating systems (eg, Windows) that do
3364 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3365 UseNUMAInterleaving = true;
3366 }
3367 }
3368 #endif
3369 return JNI_OK;
3370 }
3372 int Arguments::PropertyList_count(SystemProperty* pl) {
3373 int count = 0;
3374 while(pl != NULL) {
3375 count++;
3376 pl = pl->next();
3377 }
3378 return count;
3379 }
3381 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3382 assert(key != NULL, "just checking");
3383 SystemProperty* prop;
3384 for (prop = pl; prop != NULL; prop = prop->next()) {
3385 if (strcmp(key, prop->key()) == 0) return prop->value();
3386 }
3387 return NULL;
3388 }
3390 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3391 int count = 0;
3392 const char* ret_val = NULL;
3394 while(pl != NULL) {
3395 if(count >= index) {
3396 ret_val = pl->key();
3397 break;
3398 }
3399 count++;
3400 pl = pl->next();
3401 }
3403 return ret_val;
3404 }
3406 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3407 int count = 0;
3408 char* ret_val = NULL;
3410 while(pl != NULL) {
3411 if(count >= index) {
3412 ret_val = pl->value();
3413 break;
3414 }
3415 count++;
3416 pl = pl->next();
3417 }
3419 return ret_val;
3420 }
3422 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3423 SystemProperty* p = *plist;
3424 if (p == NULL) {
3425 *plist = new_p;
3426 } else {
3427 while (p->next() != NULL) {
3428 p = p->next();
3429 }
3430 p->set_next(new_p);
3431 }
3432 }
3434 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3435 if (plist == NULL)
3436 return;
3438 SystemProperty* new_p = new SystemProperty(k, v, true);
3439 PropertyList_add(plist, new_p);
3440 }
3442 // This add maintains unique property key in the list.
3443 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3444 if (plist == NULL)
3445 return;
3447 // If property key exist then update with new value.
3448 SystemProperty* prop;
3449 for (prop = *plist; prop != NULL; prop = prop->next()) {
3450 if (strcmp(k, prop->key()) == 0) {
3451 if (append) {
3452 prop->append_value(v);
3453 } else {
3454 prop->set_value(v);
3455 }
3456 return;
3457 }
3458 }
3460 PropertyList_add(plist, k, v);
3461 }
3463 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3464 // Returns true if all of the source pointed by src has been copied over to
3465 // the destination buffer pointed by buf. Otherwise, returns false.
3466 // Notes:
3467 // 1. If the length (buflen) of the destination buffer excluding the
3468 // NULL terminator character is not long enough for holding the expanded
3469 // pid characters, it also returns false instead of returning the partially
3470 // expanded one.
3471 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3472 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3473 char* buf, size_t buflen) {
3474 const char* p = src;
3475 char* b = buf;
3476 const char* src_end = &src[srclen];
3477 char* buf_end = &buf[buflen - 1];
3479 while (p < src_end && b < buf_end) {
3480 if (*p == '%') {
3481 switch (*(++p)) {
3482 case '%': // "%%" ==> "%"
3483 *b++ = *p++;
3484 break;
3485 case 'p': { // "%p" ==> current process id
3486 // buf_end points to the character before the last character so
3487 // that we could write '\0' to the end of the buffer.
3488 size_t buf_sz = buf_end - b + 1;
3489 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3491 // if jio_snprintf fails or the buffer is not long enough to hold
3492 // the expanded pid, returns false.
3493 if (ret < 0 || ret >= (int)buf_sz) {
3494 return false;
3495 } else {
3496 b += ret;
3497 assert(*b == '\0', "fail in copy_expand_pid");
3498 if (p == src_end && b == buf_end + 1) {
3499 // reach the end of the buffer.
3500 return true;
3501 }
3502 }
3503 p++;
3504 break;
3505 }
3506 default :
3507 *b++ = '%';
3508 }
3509 } else {
3510 *b++ = *p++;
3511 }
3512 }
3513 *b = '\0';
3514 return (p == src_end); // return false if not all of the source was copied
3515 }
