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src/share/vm/runtime/arguments.cpp@e2722a66aba7
src/share/vm/runtime/arguments.cpp
Thu, 05 Sep 2013 11:04:39 -0700
- author
- kvn
- date
- Thu, 05 Sep 2013 11:04:39 -0700
- changeset 6462
- e2722a66aba7
- parent 6461
- bdd155477289
- parent 5528
- 740e263c80c6
- child 6470
- abe03600372a
- permissions
- -rw-r--r--
Merge
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/macros.hpp"
42 #include "utilities/taskqueue.hpp"
43 #ifdef TARGET_OS_FAMILY_linux
44 # include "os_linux.inline.hpp"
45 #endif
46 #ifdef TARGET_OS_FAMILY_solaris
47 # include "os_solaris.inline.hpp"
48 #endif
49 #ifdef TARGET_OS_FAMILY_windows
50 # include "os_windows.inline.hpp"
51 #endif
52 #ifdef TARGET_OS_FAMILY_aix
53 # include "os_aix.inline.hpp"
54 #endif
55 #ifdef TARGET_OS_FAMILY_bsd
56 # include "os_bsd.inline.hpp"
57 #endif
58 #if INCLUDE_ALL_GCS
59 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
60 #endif // INCLUDE_ALL_GCS
62 // Note: This is a special bug reporting site for the JVM
63 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
64 #define DEFAULT_JAVA_LAUNCHER "generic"
66 // Disable options not supported in this release, with a warning if they
67 // were explicitly requested on the command-line
68 #define UNSUPPORTED_OPTION(opt, description) \
69 do { \
70 if (opt) { \
71 if (FLAG_IS_CMDLINE(opt)) { \
72 warning(description " is disabled in this release."); \
73 } \
74 FLAG_SET_DEFAULT(opt, false); \
75 } \
76 } while(0)
78 #define UNSUPPORTED_GC_OPTION(gc) \
79 do { \
80 if (gc) { \
81 if (FLAG_IS_CMDLINE(gc)) { \
82 warning(#gc " is not supported in this VM. Using Serial GC."); \
83 } \
84 FLAG_SET_DEFAULT(gc, false); \
85 } \
86 } while(0)
88 char** Arguments::_jvm_flags_array = NULL;
89 int Arguments::_num_jvm_flags = 0;
90 char** Arguments::_jvm_args_array = NULL;
91 int Arguments::_num_jvm_args = 0;
92 char* Arguments::_java_command = NULL;
93 SystemProperty* Arguments::_system_properties = NULL;
94 const char* Arguments::_gc_log_filename = NULL;
95 bool Arguments::_has_profile = false;
96 uintx Arguments::_min_heap_size = 0;
97 Arguments::Mode Arguments::_mode = _mixed;
98 bool Arguments::_java_compiler = false;
99 bool Arguments::_xdebug_mode = false;
100 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
101 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
102 int Arguments::_sun_java_launcher_pid = -1;
103 bool Arguments::_created_by_gamma_launcher = false;
105 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
106 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
107 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
108 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
109 bool Arguments::_ClipInlining = ClipInlining;
111 char* Arguments::SharedArchivePath = NULL;
113 AgentLibraryList Arguments::_libraryList;
114 AgentLibraryList Arguments::_agentList;
116 abort_hook_t Arguments::_abort_hook = NULL;
117 exit_hook_t Arguments::_exit_hook = NULL;
118 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
121 SystemProperty *Arguments::_java_ext_dirs = NULL;
122 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
123 SystemProperty *Arguments::_sun_boot_library_path = NULL;
124 SystemProperty *Arguments::_java_library_path = NULL;
125 SystemProperty *Arguments::_java_home = NULL;
126 SystemProperty *Arguments::_java_class_path = NULL;
127 SystemProperty *Arguments::_sun_boot_class_path = NULL;
129 char* Arguments::_meta_index_path = NULL;
130 char* Arguments::_meta_index_dir = NULL;
132 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
134 static bool match_option(const JavaVMOption *option, const char* name,
135 const char** tail) {
136 int len = (int)strlen(name);
137 if (strncmp(option->optionString, name, len) == 0) {
138 *tail = option->optionString + len;
139 return true;
140 } else {
141 return false;
142 }
143 }
145 static void logOption(const char* opt) {
146 if (PrintVMOptions) {
147 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
148 }
149 }
151 // Process java launcher properties.
152 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
153 // See if sun.java.launcher or sun.java.launcher.pid is defined.
154 // Must do this before setting up other system properties,
155 // as some of them may depend on launcher type.
156 for (int index = 0; index < args->nOptions; index++) {
157 const JavaVMOption* option = args->options + index;
158 const char* tail;
160 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
161 process_java_launcher_argument(tail, option->extraInfo);
162 continue;
163 }
164 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
165 _sun_java_launcher_pid = atoi(tail);
166 continue;
167 }
168 }
169 }
171 // Initialize system properties key and value.
172 void Arguments::init_system_properties() {
174 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
175 "Java Virtual Machine Specification", false));
176 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
177 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
178 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
180 // following are JVMTI agent writeable properties.
181 // Properties values are set to NULL and they are
182 // os specific they are initialized in os::init_system_properties_values().
183 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
184 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
185 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
186 _java_library_path = new SystemProperty("java.library.path", NULL, true);
187 _java_home = new SystemProperty("java.home", NULL, true);
188 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
190 _java_class_path = new SystemProperty("java.class.path", "", true);
192 // Add to System Property list.
193 PropertyList_add(&_system_properties, _java_ext_dirs);
194 PropertyList_add(&_system_properties, _java_endorsed_dirs);
195 PropertyList_add(&_system_properties, _sun_boot_library_path);
196 PropertyList_add(&_system_properties, _java_library_path);
197 PropertyList_add(&_system_properties, _java_home);
198 PropertyList_add(&_system_properties, _java_class_path);
199 PropertyList_add(&_system_properties, _sun_boot_class_path);
201 // Set OS specific system properties values
202 os::init_system_properties_values();
203 }
206 // Update/Initialize System properties after JDK version number is known
207 void Arguments::init_version_specific_system_properties() {
208 enum { bufsz = 16 };
209 char buffer[bufsz];
210 const char* spec_vendor = "Sun Microsystems Inc.";
211 uint32_t spec_version = 0;
213 if (JDK_Version::is_gte_jdk17x_version()) {
214 spec_vendor = "Oracle Corporation";
215 spec_version = JDK_Version::current().major_version();
216 }
217 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
219 PropertyList_add(&_system_properties,
220 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
221 PropertyList_add(&_system_properties,
222 new SystemProperty("java.vm.specification.version", buffer, false));
223 PropertyList_add(&_system_properties,
224 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
225 }
227 /**
228 * Provide a slightly more user-friendly way of eliminating -XX flags.
229 * When a flag is eliminated, it can be added to this list in order to
230 * continue accepting this flag on the command-line, while issuing a warning
231 * and ignoring the value. Once the JDK version reaches the 'accept_until'
232 * limit, we flatly refuse to admit the existence of the flag. This allows
233 * a flag to die correctly over JDK releases using HSX.
234 */
235 typedef struct {
236 const char* name;
237 JDK_Version obsoleted_in; // when the flag went away
238 JDK_Version accept_until; // which version to start denying the existence
239 } ObsoleteFlag;
241 static ObsoleteFlag obsolete_jvm_flags[] = {
242 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
243 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
244 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
245 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
246 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
247 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
248 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
249 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
250 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
251 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
252 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
253 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
254 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
255 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
256 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
257 { "DefaultInitialRAMFraction",
258 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
259 { "UseDepthFirstScavengeOrder",
260 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
261 { "HandlePromotionFailure",
262 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
263 { "MaxLiveObjectEvacuationRatio",
264 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
265 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
266 { "UseParallelOldGCCompacting",
267 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
268 { "UseParallelDensePrefixUpdate",
269 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
270 { "UseParallelOldGCDensePrefix",
271 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
272 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
273 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
274 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
275 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
276 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
277 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
278 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
279 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
280 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
281 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
282 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
283 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
284 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
285 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
286 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
287 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
288 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
289 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) },
290 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) },
291 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) },
292 #ifdef PRODUCT
293 { "DesiredMethodLimit",
294 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
295 #endif // PRODUCT
296 { NULL, JDK_Version(0), JDK_Version(0) }
297 };
299 // Returns true if the flag is obsolete and fits into the range specified
300 // for being ignored. In the case that the flag is ignored, the 'version'
301 // value is filled in with the version number when the flag became
302 // obsolete so that that value can be displayed to the user.
303 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
304 int i = 0;
305 assert(version != NULL, "Must provide a version buffer");
306 while (obsolete_jvm_flags[i].name != NULL) {
307 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
308 // <flag>=xxx form
309 // [-|+]<flag> form
310 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
311 ((s[0] == '+' || s[0] == '-') &&
312 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
313 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
314 *version = flag_status.obsoleted_in;
315 return true;
316 }
317 }
318 i++;
319 }
320 return false;
321 }
323 // Constructs the system class path (aka boot class path) from the following
324 // components, in order:
325 //
326 // prefix // from -Xbootclasspath/p:...
327 // endorsed // the expansion of -Djava.endorsed.dirs=...
328 // base // from os::get_system_properties() or -Xbootclasspath=
329 // suffix // from -Xbootclasspath/a:...
330 //
331 // java.endorsed.dirs is a list of directories; any jar or zip files in the
332 // directories are added to the sysclasspath just before the base.
333 //
334 // This could be AllStatic, but it isn't needed after argument processing is
335 // complete.
336 class SysClassPath: public StackObj {
337 public:
338 SysClassPath(const char* base);
339 ~SysClassPath();
341 inline void set_base(const char* base);
342 inline void add_prefix(const char* prefix);
343 inline void add_suffix_to_prefix(const char* suffix);
344 inline void add_suffix(const char* suffix);
345 inline void reset_path(const char* base);
347 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
348 // property. Must be called after all command-line arguments have been
349 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
350 // combined_path().
351 void expand_endorsed();
353 inline const char* get_base() const { return _items[_scp_base]; }
354 inline const char* get_prefix() const { return _items[_scp_prefix]; }
355 inline const char* get_suffix() const { return _items[_scp_suffix]; }
356 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
358 // Combine all the components into a single c-heap-allocated string; caller
359 // must free the string if/when no longer needed.
360 char* combined_path();
362 private:
363 // Utility routines.
364 static char* add_to_path(const char* path, const char* str, bool prepend);
365 static char* add_jars_to_path(char* path, const char* directory);
367 inline void reset_item_at(int index);
369 // Array indices for the items that make up the sysclasspath. All except the
370 // base are allocated in the C heap and freed by this class.
371 enum {
372 _scp_prefix, // from -Xbootclasspath/p:...
373 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
374 _scp_base, // the default sysclasspath
375 _scp_suffix, // from -Xbootclasspath/a:...
376 _scp_nitems // the number of items, must be last.
377 };
379 const char* _items[_scp_nitems];
380 DEBUG_ONLY(bool _expansion_done;)
381 };
383 SysClassPath::SysClassPath(const char* base) {
384 memset(_items, 0, sizeof(_items));
385 _items[_scp_base] = base;
386 DEBUG_ONLY(_expansion_done = false;)
387 }
389 SysClassPath::~SysClassPath() {
390 // Free everything except the base.
391 for (int i = 0; i < _scp_nitems; ++i) {
392 if (i != _scp_base) reset_item_at(i);
393 }
394 DEBUG_ONLY(_expansion_done = false;)
395 }
397 inline void SysClassPath::set_base(const char* base) {
398 _items[_scp_base] = base;
399 }
401 inline void SysClassPath::add_prefix(const char* prefix) {
402 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
403 }
405 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
406 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
407 }
409 inline void SysClassPath::add_suffix(const char* suffix) {
410 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
411 }
413 inline void SysClassPath::reset_item_at(int index) {
414 assert(index < _scp_nitems && index != _scp_base, "just checking");
415 if (_items[index] != NULL) {
416 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
417 _items[index] = NULL;
418 }
419 }
421 inline void SysClassPath::reset_path(const char* base) {
422 // Clear the prefix and suffix.
423 reset_item_at(_scp_prefix);
424 reset_item_at(_scp_suffix);
425 set_base(base);
426 }
428 //------------------------------------------------------------------------------
430 void SysClassPath::expand_endorsed() {
431 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
433 const char* path = Arguments::get_property("java.endorsed.dirs");
434 if (path == NULL) {
435 path = Arguments::get_endorsed_dir();
436 assert(path != NULL, "no default for java.endorsed.dirs");
437 }
439 char* expanded_path = NULL;
440 const char separator = *os::path_separator();
441 const char* const end = path + strlen(path);
442 while (path < end) {
443 const char* tmp_end = strchr(path, separator);
444 if (tmp_end == NULL) {
445 expanded_path = add_jars_to_path(expanded_path, path);
446 path = end;
447 } else {
448 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
449 memcpy(dirpath, path, tmp_end - path);
450 dirpath[tmp_end - path] = '\0';
451 expanded_path = add_jars_to_path(expanded_path, dirpath);
452 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
453 path = tmp_end + 1;
454 }
455 }
456 _items[_scp_endorsed] = expanded_path;
457 DEBUG_ONLY(_expansion_done = true;)
458 }
460 // Combine the bootclasspath elements, some of which may be null, into a single
461 // c-heap-allocated string.
462 char* SysClassPath::combined_path() {
463 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
464 assert(_expansion_done, "must call expand_endorsed() first.");
466 size_t lengths[_scp_nitems];
467 size_t total_len = 0;
469 const char separator = *os::path_separator();
471 // Get the lengths.
472 int i;
473 for (i = 0; i < _scp_nitems; ++i) {
474 if (_items[i] != NULL) {
475 lengths[i] = strlen(_items[i]);
476 // Include space for the separator char (or a NULL for the last item).
477 total_len += lengths[i] + 1;
478 }
479 }
480 assert(total_len > 0, "empty sysclasspath not allowed");
482 // Copy the _items to a single string.
483 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
484 char* cp_tmp = cp;
485 for (i = 0; i < _scp_nitems; ++i) {
486 if (_items[i] != NULL) {
487 memcpy(cp_tmp, _items[i], lengths[i]);
488 cp_tmp += lengths[i];
489 *cp_tmp++ = separator;
490 }
491 }
492 *--cp_tmp = '\0'; // Replace the extra separator.
493 return cp;
494 }
496 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
497 char*
498 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
499 char *cp;
501 assert(str != NULL, "just checking");
502 if (path == NULL) {
503 size_t len = strlen(str) + 1;
504 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
505 memcpy(cp, str, len); // copy the trailing null
506 } else {
507 const char separator = *os::path_separator();
508 size_t old_len = strlen(path);
509 size_t str_len = strlen(str);
510 size_t len = old_len + str_len + 2;
512 if (prepend) {
513 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
514 char* cp_tmp = cp;
515 memcpy(cp_tmp, str, str_len);
516 cp_tmp += str_len;
517 *cp_tmp = separator;
518 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
519 FREE_C_HEAP_ARRAY(char, path, mtInternal);
520 } else {
521 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
522 char* cp_tmp = cp + old_len;
523 *cp_tmp = separator;
524 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
525 }
526 }
527 return cp;
528 }
530 // Scan the directory and append any jar or zip files found to path.
531 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
532 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
533 DIR* dir = os::opendir(directory);
534 if (dir == NULL) return path;
536 char dir_sep[2] = { '\0', '\0' };
537 size_t directory_len = strlen(directory);
538 const char fileSep = *os::file_separator();
539 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
541 /* Scan the directory for jars/zips, appending them to path. */
542 struct dirent *entry;
543 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
544 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
545 const char* name = entry->d_name;
546 const char* ext = name + strlen(name) - 4;
547 bool isJarOrZip = ext > name &&
548 (os::file_name_strcmp(ext, ".jar") == 0 ||
549 os::file_name_strcmp(ext, ".zip") == 0);
550 if (isJarOrZip) {
551 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
552 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
553 path = add_to_path(path, jarpath, false);
554 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
555 }
556 }
557 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
558 os::closedir(dir);
559 return path;
560 }
562 // Parses a memory size specification string.
563 static bool atomull(const char *s, julong* result) {
564 julong n = 0;
565 int args_read = sscanf(s, JULONG_FORMAT, &n);
566 if (args_read != 1) {
567 return false;
568 }
569 while (*s != '\0' && isdigit(*s)) {
570 s++;
571 }
572 // 4705540: illegal if more characters are found after the first non-digit
573 if (strlen(s) > 1) {
574 return false;
575 }
576 switch (*s) {
577 case 'T': case 't':
578 *result = n * G * K;
579 // Check for overflow.
580 if (*result/((julong)G * K) != n) return false;
581 return true;
582 case 'G': case 'g':
583 *result = n * G;
584 if (*result/G != n) return false;
585 return true;
586 case 'M': case 'm':
587 *result = n * M;
588 if (*result/M != n) return false;
589 return true;
590 case 'K': case 'k':
591 *result = n * K;
592 if (*result/K != n) return false;
593 return true;
594 case '\0':
595 *result = n;
596 return true;
597 default:
598 return false;
599 }
600 }
602 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
603 if (size < min_size) return arg_too_small;
604 // Check that size will fit in a size_t (only relevant on 32-bit)
605 if (size > max_uintx) return arg_too_big;
606 return arg_in_range;
607 }
609 // Describe an argument out of range error
610 void Arguments::describe_range_error(ArgsRange errcode) {
611 switch(errcode) {
612 case arg_too_big:
613 jio_fprintf(defaultStream::error_stream(),
614 "The specified size exceeds the maximum "
615 "representable size.\n");
616 break;
617 case arg_too_small:
618 case arg_unreadable:
619 case arg_in_range:
620 // do nothing for now
621 break;
622 default:
623 ShouldNotReachHere();
624 }
625 }
627 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
628 return CommandLineFlags::boolAtPut(name, &value, origin);
629 }
631 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
632 double v;
633 if (sscanf(value, "%lf", &v) != 1) {
634 return false;
635 }
637 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
638 return true;
639 }
640 return false;
641 }
643 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
644 julong v;
645 intx intx_v;
646 bool is_neg = false;
647 // Check the sign first since atomull() parses only unsigned values.
648 if (*value == '-') {
649 if (!CommandLineFlags::intxAt(name, &intx_v)) {
650 return false;
651 }
652 value++;
653 is_neg = true;
654 }
655 if (!atomull(value, &v)) {
656 return false;
657 }
658 intx_v = (intx) v;
659 if (is_neg) {
660 intx_v = -intx_v;
661 }
662 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
663 return true;
664 }
665 uintx uintx_v = (uintx) v;
666 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
667 return true;
668 }
669 uint64_t uint64_t_v = (uint64_t) v;
670 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
671 return true;
672 }
673 return false;
674 }
676 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
677 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
678 // Contract: CommandLineFlags always returns a pointer that needs freeing.
679 FREE_C_HEAP_ARRAY(char, value, mtInternal);
680 return true;
681 }
683 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
684 const char* old_value = "";
685 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
686 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
687 size_t new_len = strlen(new_value);
688 const char* value;
689 char* free_this_too = NULL;
690 if (old_len == 0) {
691 value = new_value;
692 } else if (new_len == 0) {
693 value = old_value;
694 } else {
695 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
696 // each new setting adds another LINE to the switch:
697 sprintf(buf, "%s\n%s", old_value, new_value);
698 value = buf;
699 free_this_too = buf;
700 }
701 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
702 // CommandLineFlags always returns a pointer that needs freeing.
703 FREE_C_HEAP_ARRAY(char, value, mtInternal);
704 if (free_this_too != NULL) {
705 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
706 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
707 }
708 return true;
709 }
711 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
713 // range of acceptable characters spelled out for portability reasons
714 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
715 #define BUFLEN 255
716 char name[BUFLEN+1];
717 char dummy;
719 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
720 return set_bool_flag(name, false, origin);
721 }
722 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
723 return set_bool_flag(name, true, origin);
724 }
726 char punct;
727 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
728 const char* value = strchr(arg, '=') + 1;
729 Flag* flag = Flag::find_flag(name, strlen(name));
730 if (flag != NULL && flag->is_ccstr()) {
731 if (flag->ccstr_accumulates()) {
732 return append_to_string_flag(name, value, origin);
733 } else {
734 if (value[0] == '\0') {
735 value = NULL;
736 }
737 return set_string_flag(name, value, origin);
738 }
739 }
740 }
742 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
743 const char* value = strchr(arg, '=') + 1;
744 // -XX:Foo:=xxx will reset the string flag to the given value.
745 if (value[0] == '\0') {
746 value = NULL;
747 }
748 return set_string_flag(name, value, origin);
749 }
751 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
752 #define SIGNED_NUMBER_RANGE "[-0123456789]"
753 #define NUMBER_RANGE "[0123456789]"
754 char value[BUFLEN + 1];
755 char value2[BUFLEN + 1];
756 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
757 // Looks like a floating-point number -- try again with more lenient format string
758 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
759 return set_fp_numeric_flag(name, value, origin);
760 }
761 }
763 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
764 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
765 return set_numeric_flag(name, value, origin);
766 }
768 return false;
769 }
771 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
772 assert(bldarray != NULL, "illegal argument");
774 if (arg == NULL) {
775 return;
776 }
778 int new_count = *count + 1;
780 // expand the array and add arg to the last element
781 if (*bldarray == NULL) {
782 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
783 } else {
784 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
785 }
786 (*bldarray)[*count] = strdup(arg);
787 *count = new_count;
788 }
790 void Arguments::build_jvm_args(const char* arg) {
791 add_string(&_jvm_args_array, &_num_jvm_args, arg);
792 }
794 void Arguments::build_jvm_flags(const char* arg) {
795 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
796 }
798 // utility function to return a string that concatenates all
799 // strings in a given char** array
800 const char* Arguments::build_resource_string(char** args, int count) {
801 if (args == NULL || count == 0) {
802 return NULL;
803 }
804 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
805 for (int i = 1; i < count; i++) {
806 length += strlen(args[i]) + 1; // add 1 for a space
807 }
808 char* s = NEW_RESOURCE_ARRAY(char, length);
809 strcpy(s, args[0]);
810 for (int j = 1; j < count; j++) {
811 strcat(s, " ");
812 strcat(s, args[j]);
813 }
814 return (const char*) s;
815 }
817 void Arguments::print_on(outputStream* st) {
818 st->print_cr("VM Arguments:");
819 if (num_jvm_flags() > 0) {
820 st->print("jvm_flags: "); print_jvm_flags_on(st);
821 }
822 if (num_jvm_args() > 0) {
823 st->print("jvm_args: "); print_jvm_args_on(st);
824 }
825 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
826 if (_java_class_path != NULL) {
827 char* path = _java_class_path->value();
828 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
829 }
830 st->print_cr("Launcher Type: %s", _sun_java_launcher);
831 }
833 void Arguments::print_jvm_flags_on(outputStream* st) {
834 if (_num_jvm_flags > 0) {
835 for (int i=0; i < _num_jvm_flags; i++) {
836 st->print("%s ", _jvm_flags_array[i]);
837 }
838 st->print_cr("");
839 }
840 }
842 void Arguments::print_jvm_args_on(outputStream* st) {
843 if (_num_jvm_args > 0) {
844 for (int i=0; i < _num_jvm_args; i++) {
845 st->print("%s ", _jvm_args_array[i]);
846 }
847 st->print_cr("");
848 }
849 }
851 bool Arguments::process_argument(const char* arg,
852 jboolean ignore_unrecognized, FlagValueOrigin origin) {
854 JDK_Version since = JDK_Version();
856 if (parse_argument(arg, origin) || ignore_unrecognized) {
857 return true;
858 }
860 bool has_plus_minus = (*arg == '+' || *arg == '-');
861 const char* const argname = has_plus_minus ? arg + 1 : arg;
862 if (is_newly_obsolete(arg, &since)) {
863 char version[256];
864 since.to_string(version, sizeof(version));
865 warning("ignoring option %s; support was removed in %s", argname, version);
866 return true;
867 }
869 // For locked flags, report a custom error message if available.
870 // Otherwise, report the standard unrecognized VM option.
872 size_t arg_len;
873 const char* equal_sign = strchr(argname, '=');
874 if (equal_sign == NULL) {
875 arg_len = strlen(argname);
876 } else {
877 arg_len = equal_sign - argname;
878 }
880 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true);
881 if (found_flag != NULL) {
882 char locked_message_buf[BUFLEN];
883 found_flag->get_locked_message(locked_message_buf, BUFLEN);
884 if (strlen(locked_message_buf) == 0) {
885 if (found_flag->is_bool() && !has_plus_minus) {
886 jio_fprintf(defaultStream::error_stream(),
887 "Missing +/- setting for VM option '%s'\n", argname);
888 } else if (!found_flag->is_bool() && has_plus_minus) {
889 jio_fprintf(defaultStream::error_stream(),
890 "Unexpected +/- setting in VM option '%s'\n", argname);
891 } else {
892 jio_fprintf(defaultStream::error_stream(),
893 "Improperly specified VM option '%s'\n", argname);
894 }
895 } else {
896 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
897 }
898 } else {
899 jio_fprintf(defaultStream::error_stream(),
900 "Unrecognized VM option '%s'\n", argname);
901 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true);
902 if (fuzzy_matched != NULL) {
903 jio_fprintf(defaultStream::error_stream(),
904 "Did you mean '%s%s%s'?\n",
905 (fuzzy_matched->is_bool()) ? "(+/-)" : "",
906 fuzzy_matched->name,
907 (fuzzy_matched->is_bool()) ? "" : "=<value>");
908 }
909 }
911 // allow for commandline "commenting out" options like -XX:#+Verbose
912 return arg[0] == '#';
913 }
915 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
916 FILE* stream = fopen(file_name, "rb");
917 if (stream == NULL) {
918 if (should_exist) {
919 jio_fprintf(defaultStream::error_stream(),
920 "Could not open settings file %s\n", file_name);
921 return false;
922 } else {
923 return true;
924 }
925 }
927 char token[1024];
928 int pos = 0;
930 bool in_white_space = true;
931 bool in_comment = false;
932 bool in_quote = false;
933 char quote_c = 0;
934 bool result = true;
936 int c = getc(stream);
937 while(c != EOF && pos < (int)(sizeof(token)-1)) {
938 if (in_white_space) {
939 if (in_comment) {
940 if (c == '\n') in_comment = false;
941 } else {
942 if (c == '#') in_comment = true;
943 else if (!isspace(c)) {
944 in_white_space = false;
945 token[pos++] = c;
946 }
947 }
948 } else {
949 if (c == '\n' || (!in_quote && isspace(c))) {
950 // token ends at newline, or at unquoted whitespace
951 // this allows a way to include spaces in string-valued options
952 token[pos] = '\0';
953 logOption(token);
954 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
955 build_jvm_flags(token);
956 pos = 0;
957 in_white_space = true;
958 in_quote = false;
959 } else if (!in_quote && (c == '\'' || c == '"')) {
960 in_quote = true;
961 quote_c = c;
962 } else if (in_quote && (c == quote_c)) {
963 in_quote = false;
964 } else {
965 token[pos++] = c;
966 }
967 }
968 c = getc(stream);
969 }
970 if (pos > 0) {
971 token[pos] = '\0';
972 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
973 build_jvm_flags(token);
974 }
975 fclose(stream);
976 return result;
977 }
979 //=============================================================================================================
980 // Parsing of properties (-D)
982 const char* Arguments::get_property(const char* key) {
983 return PropertyList_get_value(system_properties(), key);
984 }
986 bool Arguments::add_property(const char* prop) {
987 const char* eq = strchr(prop, '=');
988 char* key;
989 // ns must be static--its address may be stored in a SystemProperty object.
990 const static char ns[1] = {0};
991 char* value = (char *)ns;
993 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
994 key = AllocateHeap(key_len + 1, mtInternal);
995 strncpy(key, prop, key_len);
996 key[key_len] = '\0';
998 if (eq != NULL) {
999 size_t value_len = strlen(prop) - key_len - 1;
1000 value = AllocateHeap(value_len + 1, mtInternal);
1001 strncpy(value, &prop[key_len + 1], value_len + 1);
1002 }
1004 if (strcmp(key, "java.compiler") == 0) {
1005 process_java_compiler_argument(value);
1006 FreeHeap(key);
1007 if (eq != NULL) {
1008 FreeHeap(value);
1009 }
1010 return true;
1011 } else if (strcmp(key, "sun.java.command") == 0) {
1012 _java_command = value;
1014 // Record value in Arguments, but let it get passed to Java.
1015 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
1016 // launcher.pid property is private and is processed
1017 // in process_sun_java_launcher_properties();
1018 // the sun.java.launcher property is passed on to the java application
1019 FreeHeap(key);
1020 if (eq != NULL) {
1021 FreeHeap(value);
1022 }
1023 return true;
1024 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
1025 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
1026 // its value without going through the property list or making a Java call.
1027 _java_vendor_url_bug = value;
1028 } else if (strcmp(key, "sun.boot.library.path") == 0) {
1029 PropertyList_unique_add(&_system_properties, key, value, true);
1030 return true;
1031 }
1032 // Create new property and add at the end of the list
1033 PropertyList_unique_add(&_system_properties, key, value);
1034 return true;
1035 }
1037 //===========================================================================================================
1038 // Setting int/mixed/comp mode flags
1040 void Arguments::set_mode_flags(Mode mode) {
1041 // Set up default values for all flags.
1042 // If you add a flag to any of the branches below,
1043 // add a default value for it here.
1044 set_java_compiler(false);
1045 _mode = mode;
1047 // Ensure Agent_OnLoad has the correct initial values.
1048 // This may not be the final mode; mode may change later in onload phase.
1049 PropertyList_unique_add(&_system_properties, "java.vm.info",
1050 (char*)VM_Version::vm_info_string(), false);
1052 UseInterpreter = true;
1053 UseCompiler = true;
1054 UseLoopCounter = true;
1056 #ifndef ZERO
1057 // Turn these off for mixed and comp. Leave them on for Zero.
1058 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1059 UseFastAccessorMethods = (mode == _int);
1060 }
1061 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1062 UseFastEmptyMethods = (mode == _int);
1063 }
1064 #endif
1066 // Default values may be platform/compiler dependent -
1067 // use the saved values
1068 ClipInlining = Arguments::_ClipInlining;
1069 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1070 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1071 BackgroundCompilation = Arguments::_BackgroundCompilation;
1073 // Change from defaults based on mode
1074 switch (mode) {
1075 default:
1076 ShouldNotReachHere();
1077 break;
1078 case _int:
1079 UseCompiler = false;
1080 UseLoopCounter = false;
1081 AlwaysCompileLoopMethods = false;
1082 UseOnStackReplacement = false;
1083 break;
1084 case _mixed:
1085 // same as default
1086 break;
1087 case _comp:
1088 UseInterpreter = false;
1089 BackgroundCompilation = false;
1090 ClipInlining = false;
1091 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1092 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1093 // compile a level 4 (C2) and then continue executing it.
1094 if (TieredCompilation) {
1095 Tier3InvokeNotifyFreqLog = 0;
1096 Tier4InvocationThreshold = 0;
1097 }
1098 break;
1099 }
1100 }
1102 // Conflict: required to use shared spaces (-Xshare:on), but
1103 // incompatible command line options were chosen.
1105 static void no_shared_spaces() {
1106 if (RequireSharedSpaces) {
1107 jio_fprintf(defaultStream::error_stream(),
1108 "Class data sharing is inconsistent with other specified options.\n");
1109 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1110 } else {
1111 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1112 }
1113 }
1115 void Arguments::set_tiered_flags() {
1116 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1117 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1118 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1119 }
1120 if (CompilationPolicyChoice < 2) {
1121 vm_exit_during_initialization(
1122 "Incompatible compilation policy selected", NULL);
1123 }
1124 // Increase the code cache size - tiered compiles a lot more.
1125 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1126 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1127 }
1128 if (!UseInterpreter) { // -Xcomp
1129 Tier3InvokeNotifyFreqLog = 0;
1130 Tier4InvocationThreshold = 0;
1131 }
1132 }
1134 #if INCLUDE_ALL_GCS
1135 static void disable_adaptive_size_policy(const char* collector_name) {
1136 if (UseAdaptiveSizePolicy) {
1137 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1138 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1139 collector_name);
1140 }
1141 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1142 }
1143 }
1145 void Arguments::set_parnew_gc_flags() {
1146 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1147 "control point invariant");
1148 assert(UseParNewGC, "Error");
1150 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1151 disable_adaptive_size_policy("UseParNewGC");
1153 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1154 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1155 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1156 } else if (ParallelGCThreads == 0) {
1157 jio_fprintf(defaultStream::error_stream(),
1158 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1159 vm_exit(1);
1160 }
1162 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1163 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1164 // we set them to 1024 and 1024.
1165 // See CR 6362902.
1166 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1167 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1168 }
1169 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1170 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1171 }
1173 // AlwaysTenure flag should make ParNew promote all at first collection.
1174 // See CR 6362902.
1175 if (AlwaysTenure) {
1176 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1177 }
1178 // When using compressed oops, we use local overflow stacks,
1179 // rather than using a global overflow list chained through
1180 // the klass word of the object's pre-image.
1181 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1182 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1183 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1184 }
1185 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1186 }
1187 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1188 }
1190 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1191 // sparc/solaris for certain applications, but would gain from
1192 // further optimization and tuning efforts, and would almost
1193 // certainly gain from analysis of platform and environment.
1194 void Arguments::set_cms_and_parnew_gc_flags() {
1195 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1196 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1198 // If we are using CMS, we prefer to UseParNewGC,
1199 // unless explicitly forbidden.
1200 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1201 FLAG_SET_ERGO(bool, UseParNewGC, true);
1202 }
1204 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1205 disable_adaptive_size_policy("UseConcMarkSweepGC");
1207 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1208 // as needed.
1209 if (UseParNewGC) {
1210 set_parnew_gc_flags();
1211 }
1213 size_t max_heap = align_size_down(MaxHeapSize,
1214 CardTableRS::ct_max_alignment_constraint());
1216 // Now make adjustments for CMS
1217 intx tenuring_default = (intx)6;
1218 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1220 // Preferred young gen size for "short" pauses:
1221 // upper bound depends on # of threads and NewRatio.
1222 const uintx parallel_gc_threads =
1223 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1224 const size_t preferred_max_new_size_unaligned =
1225 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1226 size_t preferred_max_new_size =
1227 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1229 // Unless explicitly requested otherwise, size young gen
1230 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1232 // If either MaxNewSize or NewRatio is set on the command line,
1233 // assume the user is trying to set the size of the young gen.
1234 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1236 // Set MaxNewSize to our calculated preferred_max_new_size unless
1237 // NewSize was set on the command line and it is larger than
1238 // preferred_max_new_size.
1239 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1240 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1241 } else {
1242 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1243 }
1244 if (PrintGCDetails && Verbose) {
1245 // Too early to use gclog_or_tty
1246 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1247 }
1249 // Code along this path potentially sets NewSize and OldSize
1250 if (PrintGCDetails && Verbose) {
1251 // Too early to use gclog_or_tty
1252 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1253 " initial_heap_size: " SIZE_FORMAT
1254 " max_heap: " SIZE_FORMAT,
1255 min_heap_size(), InitialHeapSize, max_heap);
1256 }
1257 size_t min_new = preferred_max_new_size;
1258 if (FLAG_IS_CMDLINE(NewSize)) {
1259 min_new = NewSize;
1260 }
1261 if (max_heap > min_new && min_heap_size() > min_new) {
1262 // Unless explicitly requested otherwise, make young gen
1263 // at least min_new, and at most preferred_max_new_size.
1264 if (FLAG_IS_DEFAULT(NewSize)) {
1265 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1266 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1267 if (PrintGCDetails && Verbose) {
1268 // Too early to use gclog_or_tty
1269 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1270 }
1271 }
1272 // Unless explicitly requested otherwise, size old gen
1273 // so it's NewRatio x of NewSize.
1274 if (FLAG_IS_DEFAULT(OldSize)) {
1275 if (max_heap > NewSize) {
1276 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1277 if (PrintGCDetails && Verbose) {
1278 // Too early to use gclog_or_tty
1279 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1280 }
1281 }
1282 }
1283 }
1284 }
1285 // Unless explicitly requested otherwise, definitely
1286 // promote all objects surviving "tenuring_default" scavenges.
1287 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1288 FLAG_IS_DEFAULT(SurvivorRatio)) {
1289 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1290 }
1291 // If we decided above (or user explicitly requested)
1292 // `promote all' (via MaxTenuringThreshold := 0),
1293 // prefer minuscule survivor spaces so as not to waste
1294 // space for (non-existent) survivors
1295 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1296 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1297 }
1298 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1299 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1300 // This is done in order to make ParNew+CMS configuration to work
1301 // with YoungPLABSize and OldPLABSize options.
1302 // See CR 6362902.
1303 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1304 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1305 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1306 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1307 // the value (either from the command line or ergonomics) of
1308 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1309 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1310 } else {
1311 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1312 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1313 // we'll let it to take precedence.
1314 jio_fprintf(defaultStream::error_stream(),
1315 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1316 " options are specified for the CMS collector."
1317 " CMSParPromoteBlocksToClaim will take precedence.\n");
1318 }
1319 }
1320 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1321 // OldPLAB sizing manually turned off: Use a larger default setting,
1322 // unless it was manually specified. This is because a too-low value
1323 // will slow down scavenges.
1324 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1325 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1326 }
1327 }
1328 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1329 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1330 // If either of the static initialization defaults have changed, note this
1331 // modification.
1332 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1333 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1334 }
1335 if (PrintGCDetails && Verbose) {
1336 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1337 MarkStackSize / K, MarkStackSizeMax / K);
1338 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1339 }
1340 }
1341 #endif // INCLUDE_ALL_GCS
1343 void set_object_alignment() {
1344 // Object alignment.
1345 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1346 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1347 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1348 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1349 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1350 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1352 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1353 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1355 // Oop encoding heap max
1356 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1358 #if INCLUDE_ALL_GCS
1359 // Set CMS global values
1360 CompactibleFreeListSpace::set_cms_values();
1361 #endif // INCLUDE_ALL_GCS
1362 }
1364 bool verify_object_alignment() {
1365 // Object alignment.
1366 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1367 jio_fprintf(defaultStream::error_stream(),
1368 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1369 (int)ObjectAlignmentInBytes);
1370 return false;
1371 }
1372 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1373 jio_fprintf(defaultStream::error_stream(),
1374 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1375 (int)ObjectAlignmentInBytes, BytesPerLong);
1376 return false;
1377 }
1378 // It does not make sense to have big object alignment
1379 // since a space lost due to alignment will be greater
1380 // then a saved space from compressed oops.
1381 if ((int)ObjectAlignmentInBytes > 256) {
1382 jio_fprintf(defaultStream::error_stream(),
1383 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1384 (int)ObjectAlignmentInBytes);
1385 return false;
1386 }
1387 // In case page size is very small.
1388 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1389 jio_fprintf(defaultStream::error_stream(),
1390 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1391 (int)ObjectAlignmentInBytes, os::vm_page_size());
1392 return false;
1393 }
1394 return true;
1395 }
1397 inline uintx max_heap_for_compressed_oops() {
1398 // Avoid sign flip.
1399 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size");
1400 LP64_ONLY(return OopEncodingHeapMax - os::vm_page_size());
1401 NOT_LP64(ShouldNotReachHere(); return 0);
1402 }
1404 bool Arguments::should_auto_select_low_pause_collector() {
1405 if (UseAutoGCSelectPolicy &&
1406 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1407 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1408 if (PrintGCDetails) {
1409 // Cannot use gclog_or_tty yet.
1410 tty->print_cr("Automatic selection of the low pause collector"
1411 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1412 }
1413 return true;
1414 }
1415 return false;
1416 }
1418 void Arguments::set_use_compressed_oops() {
1419 #ifndef ZERO
1420 #ifdef _LP64
1421 // MaxHeapSize is not set up properly at this point, but
1422 // the only value that can override MaxHeapSize if we are
1423 // to use UseCompressedOops is InitialHeapSize.
1424 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1426 if (max_heap_size <= max_heap_for_compressed_oops()) {
1427 #if !defined(COMPILER1) || defined(TIERED)
1428 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1429 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1430 }
1431 #endif
1432 #ifdef _WIN64
1433 if (UseLargePages && UseCompressedOops) {
1434 // Cannot allocate guard pages for implicit checks in indexed addressing
1435 // mode, when large pages are specified on windows.
1436 // This flag could be switched ON if narrow oop base address is set to 0,
1437 // see code in Universe::initialize_heap().
1438 Universe::set_narrow_oop_use_implicit_null_checks(false);
1439 }
1440 #endif // _WIN64
1441 } else {
1442 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1443 warning("Max heap size too large for Compressed Oops");
1444 FLAG_SET_DEFAULT(UseCompressedOops, false);
1445 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1446 }
1447 }
1448 #endif // _LP64
1449 #endif // ZERO
1450 }
1453 // NOTE: set_use_compressed_klass_ptrs() must be called after calling
1454 // set_use_compressed_oops().
1455 void Arguments::set_use_compressed_klass_ptrs() {
1456 #ifndef ZERO
1457 #ifdef _LP64
1458 // UseCompressedOops must be on for UseCompressedKlassPointers to be on.
1459 if (!UseCompressedOops) {
1460 if (UseCompressedKlassPointers) {
1461 warning("UseCompressedKlassPointers requires UseCompressedOops");
1462 }
1463 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1464 } else {
1465 // Turn on UseCompressedKlassPointers too
1466 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) {
1467 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true);
1468 }
1469 // Check the ClassMetaspaceSize to make sure we use compressed klass ptrs.
1470 if (UseCompressedKlassPointers) {
1471 if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) {
1472 warning("Class metaspace size is too large for UseCompressedKlassPointers");
1473 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1474 }
1475 }
1476 }
1477 #endif // _LP64
1478 #endif // !ZERO
1479 }
1481 void Arguments::set_ergonomics_flags() {
1483 if (os::is_server_class_machine()) {
1484 // If no other collector is requested explicitly,
1485 // let the VM select the collector based on
1486 // machine class and automatic selection policy.
1487 if (!UseSerialGC &&
1488 !UseConcMarkSweepGC &&
1489 !UseG1GC &&
1490 !UseParNewGC &&
1491 FLAG_IS_DEFAULT(UseParallelGC)) {
1492 if (should_auto_select_low_pause_collector()) {
1493 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1494 } else {
1495 FLAG_SET_ERGO(bool, UseParallelGC, true);
1496 }
1497 }
1498 // Shared spaces work fine with other GCs but causes bytecode rewriting
1499 // to be disabled, which hurts interpreter performance and decreases
1500 // server performance. On server class machines, keep the default
1501 // off unless it is asked for. Future work: either add bytecode rewriting
1502 // at link time, or rewrite bytecodes in non-shared methods.
1503 if (!DumpSharedSpaces && !RequireSharedSpaces &&
1504 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) {
1505 no_shared_spaces();
1506 }
1507 }
1509 #ifndef ZERO
1510 #ifdef _LP64
1511 set_use_compressed_oops();
1513 // set_use_compressed_klass_ptrs() must be called after calling
1514 // set_use_compressed_oops().
1515 set_use_compressed_klass_ptrs();
1517 // Also checks that certain machines are slower with compressed oops
1518 // in vm_version initialization code.
1519 #endif // _LP64
1520 #endif // !ZERO
1521 }
1523 void Arguments::set_parallel_gc_flags() {
1524 assert(UseParallelGC || UseParallelOldGC, "Error");
1525 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1526 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1527 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1528 }
1529 FLAG_SET_DEFAULT(UseParallelGC, true);
1531 // If no heap maximum was requested explicitly, use some reasonable fraction
1532 // of the physical memory, up to a maximum of 1GB.
1533 FLAG_SET_DEFAULT(ParallelGCThreads,
1534 Abstract_VM_Version::parallel_worker_threads());
1535 if (ParallelGCThreads == 0) {
1536 jio_fprintf(defaultStream::error_stream(),
1537 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1538 vm_exit(1);
1539 }
1542 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1543 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1544 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1545 // See CR 6362902 for details.
1546 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1547 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1548 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1549 }
1550 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1551 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1552 }
1553 }
1555 if (UseParallelOldGC) {
1556 // Par compact uses lower default values since they are treated as
1557 // minimums. These are different defaults because of the different
1558 // interpretation and are not ergonomically set.
1559 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1560 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1561 }
1562 }
1563 }
1565 void Arguments::set_g1_gc_flags() {
1566 assert(UseG1GC, "Error");
1567 #ifdef COMPILER1
1568 FastTLABRefill = false;
1569 #endif
1570 FLAG_SET_DEFAULT(ParallelGCThreads,
1571 Abstract_VM_Version::parallel_worker_threads());
1572 if (ParallelGCThreads == 0) {
1573 FLAG_SET_DEFAULT(ParallelGCThreads,
1574 Abstract_VM_Version::parallel_worker_threads());
1575 }
1577 // MarkStackSize will be set (if it hasn't been set by the user)
1578 // when concurrent marking is initialized.
1579 // Its value will be based upon the number of parallel marking threads.
1580 // But we do set the maximum mark stack size here.
1581 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1582 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1583 }
1585 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1586 // In G1, we want the default GC overhead goal to be higher than
1587 // say in PS. So we set it here to 10%. Otherwise the heap might
1588 // be expanded more aggressively than we would like it to. In
1589 // fact, even 10% seems to not be high enough in some cases
1590 // (especially small GC stress tests that the main thing they do
1591 // is allocation). We might consider increase it further.
1592 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1593 }
1595 if (PrintGCDetails && Verbose) {
1596 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1597 MarkStackSize / K, MarkStackSizeMax / K);
1598 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1599 }
1600 }
1602 julong Arguments::limit_by_allocatable_memory(julong limit) {
1603 julong max_allocatable;
1604 julong result = limit;
1605 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1606 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1607 }
1608 return result;
1609 }
1611 void Arguments::set_heap_base_min_address() {
1612 if (FLAG_IS_DEFAULT(HeapBaseMinAddress) && UseG1GC && HeapBaseMinAddress < 1*G) {
1613 // By default HeapBaseMinAddress is 2G on all platforms except Solaris x86.
1614 // G1 currently needs a lot of C-heap, so on Solaris we have to give G1
1615 // some extra space for the C-heap compared to other collectors.
1616 // Use FLAG_SET_DEFAULT here rather than FLAG_SET_ERGO to make sure that
1617 // code that checks for default values work correctly.
1618 FLAG_SET_DEFAULT(HeapBaseMinAddress, 1*G);
1619 }
1620 }
1622 void Arguments::set_heap_size() {
1623 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1624 // Deprecated flag
1625 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1626 }
1628 const julong phys_mem =
1629 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1630 : (julong)MaxRAM;
1632 // If the maximum heap size has not been set with -Xmx,
1633 // then set it as fraction of the size of physical memory,
1634 // respecting the maximum and minimum sizes of the heap.
1635 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1636 julong reasonable_max = phys_mem / MaxRAMFraction;
1638 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1639 // Small physical memory, so use a minimum fraction of it for the heap
1640 reasonable_max = phys_mem / MinRAMFraction;
1641 } else {
1642 // Not-small physical memory, so require a heap at least
1643 // as large as MaxHeapSize
1644 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1645 }
1646 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1647 // Limit the heap size to ErgoHeapSizeLimit
1648 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1649 }
1650 if (UseCompressedOops) {
1651 // Limit the heap size to the maximum possible when using compressed oops
1652 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1653 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1654 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1655 // but it should be not less than default MaxHeapSize.
1656 max_coop_heap -= HeapBaseMinAddress;
1657 }
1658 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1659 }
1660 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1662 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1663 // An initial heap size was specified on the command line,
1664 // so be sure that the maximum size is consistent. Done
1665 // after call to limit_by_allocatable_memory because that
1666 // method might reduce the allocation size.
1667 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1668 }
1670 if (PrintGCDetails && Verbose) {
1671 // Cannot use gclog_or_tty yet.
1672 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1673 }
1674 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1675 }
1677 // If the minimum or initial heap_size have not been set or requested to be set
1678 // ergonomically, set them accordingly.
1679 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1680 julong reasonable_minimum = (julong)(OldSize + NewSize);
1682 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1684 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1686 if (InitialHeapSize == 0) {
1687 julong reasonable_initial = phys_mem / InitialRAMFraction;
1689 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1690 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1692 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1694 if (PrintGCDetails && Verbose) {
1695 // Cannot use gclog_or_tty yet.
1696 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1697 }
1698 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1699 }
1700 // If the minimum heap size has not been set (via -Xms),
1701 // synchronize with InitialHeapSize to avoid errors with the default value.
1702 if (min_heap_size() == 0) {
1703 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1704 if (PrintGCDetails && Verbose) {
1705 // Cannot use gclog_or_tty yet.
1706 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1707 }
1708 }
1709 }
1710 }
1712 // This must be called after ergonomics because we want bytecode rewriting
1713 // if the server compiler is used, or if UseSharedSpaces is disabled.
1714 void Arguments::set_bytecode_flags() {
1715 // Better not attempt to store into a read-only space.
1716 if (UseSharedSpaces) {
1717 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1718 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1719 }
1721 if (!RewriteBytecodes) {
1722 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1723 }
1724 }
1726 // Aggressive optimization flags -XX:+AggressiveOpts
1727 void Arguments::set_aggressive_opts_flags() {
1728 #ifdef COMPILER2
1729 if (AggressiveUnboxing) {
1730 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1731 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1732 } else if (!EliminateAutoBox) {
1733 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1734 AggressiveUnboxing = false;
1735 }
1736 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1737 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1738 } else if (!DoEscapeAnalysis) {
1739 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1740 AggressiveUnboxing = false;
1741 }
1742 }
1743 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1744 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1745 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1746 }
1747 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1748 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1749 }
1751 // Feed the cache size setting into the JDK
1752 char buffer[1024];
1753 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1754 add_property(buffer);
1755 }
1756 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1757 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1758 }
1759 #endif
1761 if (AggressiveOpts) {
1762 // Sample flag setting code
1763 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1764 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1765 // }
1766 }
1767 }
1769 //===========================================================================================================
1770 // Parsing of java.compiler property
1772 void Arguments::process_java_compiler_argument(char* arg) {
1773 // For backwards compatibility, Djava.compiler=NONE or ""
1774 // causes us to switch to -Xint mode UNLESS -Xdebug
1775 // is also specified.
1776 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1777 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1778 }
1779 }
1781 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1782 _sun_java_launcher = strdup(launcher);
1783 if (strcmp("gamma", _sun_java_launcher) == 0) {
1784 _created_by_gamma_launcher = true;
1785 }
1786 }
1788 bool Arguments::created_by_java_launcher() {
1789 assert(_sun_java_launcher != NULL, "property must have value");
1790 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1791 }
1793 bool Arguments::created_by_gamma_launcher() {
1794 return _created_by_gamma_launcher;
1795 }
1797 //===========================================================================================================
1798 // Parsing of main arguments
1800 bool Arguments::verify_interval(uintx val, uintx min,
1801 uintx max, const char* name) {
1802 // Returns true iff value is in the inclusive interval [min..max]
1803 // false, otherwise.
1804 if (val >= min && val <= max) {
1805 return true;
1806 }
1807 jio_fprintf(defaultStream::error_stream(),
1808 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1809 " and " UINTX_FORMAT "\n",
1810 name, val, min, max);
1811 return false;
1812 }
1814 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1815 // Returns true if given value is at least specified min threshold
1816 // false, otherwise.
1817 if (val >= min ) {
1818 return true;
1819 }
1820 jio_fprintf(defaultStream::error_stream(),
1821 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1822 name, val, min);
1823 return false;
1824 }
1826 bool Arguments::verify_percentage(uintx value, const char* name) {
1827 if (value <= 100) {
1828 return true;
1829 }
1830 jio_fprintf(defaultStream::error_stream(),
1831 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1832 name, value);
1833 return false;
1834 }
1836 #if !INCLUDE_ALL_GCS
1837 #ifdef ASSERT
1838 static bool verify_serial_gc_flags() {
1839 return (UseSerialGC &&
1840 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1841 UseParallelGC || UseParallelOldGC));
1842 }
1843 #endif // ASSERT
1844 #endif // INCLUDE_ALL_GCS
1846 // check if do gclog rotation
1847 // +UseGCLogFileRotation is a must,
1848 // no gc log rotation when log file not supplied or
1849 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1850 void check_gclog_consistency() {
1851 if (UseGCLogFileRotation) {
1852 if ((Arguments::gc_log_filename() == NULL) ||
1853 (NumberOfGCLogFiles == 0) ||
1854 (GCLogFileSize == 0)) {
1855 jio_fprintf(defaultStream::output_stream(),
1856 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1857 "where num_of_file > 0 and num_of_size > 0\n"
1858 "GC log rotation is turned off\n");
1859 UseGCLogFileRotation = false;
1860 }
1861 }
1863 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1864 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1865 jio_fprintf(defaultStream::output_stream(),
1866 "GCLogFileSize changed to minimum 8K\n");
1867 }
1868 }
1870 // Check consistency of GC selection
1871 bool Arguments::check_gc_consistency() {
1872 check_gclog_consistency();
1873 bool status = true;
1874 // Ensure that the user has not selected conflicting sets
1875 // of collectors. [Note: this check is merely a user convenience;
1876 // collectors over-ride each other so that only a non-conflicting
1877 // set is selected; however what the user gets is not what they
1878 // may have expected from the combination they asked for. It's
1879 // better to reduce user confusion by not allowing them to
1880 // select conflicting combinations.
1881 uint i = 0;
1882 if (UseSerialGC) i++;
1883 if (UseConcMarkSweepGC || UseParNewGC) i++;
1884 if (UseParallelGC || UseParallelOldGC) i++;
1885 if (UseG1GC) i++;
1886 if (i > 1) {
1887 jio_fprintf(defaultStream::error_stream(),
1888 "Conflicting collector combinations in option list; "
1889 "please refer to the release notes for the combinations "
1890 "allowed\n");
1891 status = false;
1892 } else if (ReservedCodeCacheSize > 2*G) {
1893 // Code cache size larger than MAXINT is not supported.
1894 jio_fprintf(defaultStream::error_stream(),
1895 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
1896 (2*G)/M);
1897 status = false;
1898 }
1899 return status;
1900 }
1902 void Arguments::check_deprecated_gcs() {
1903 if (UseConcMarkSweepGC && !UseParNewGC) {
1904 warning("Using the DefNew young collector with the CMS collector is deprecated "
1905 "and will likely be removed in a future release");
1906 }
1908 if (UseParNewGC && !UseConcMarkSweepGC) {
1909 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1910 // set up UseSerialGC properly, so that can't be used in the check here.
1911 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1912 "and will likely be removed in a future release");
1913 }
1915 if (CMSIncrementalMode) {
1916 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1917 }
1918 }
1920 void Arguments::check_deprecated_gc_flags() {
1921 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
1922 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
1923 "and will likely be removed in future release");
1924 }
1925 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) {
1926 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. "
1927 "Use MaxRAMFraction instead.");
1928 }
1929 }
1931 // Check stack pages settings
1932 bool Arguments::check_stack_pages()
1933 {
1934 bool status = true;
1935 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1936 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1937 // greater stack shadow pages can't generate instruction to bang stack
1938 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1939 return status;
1940 }
1942 // Check the consistency of vm_init_args
1943 bool Arguments::check_vm_args_consistency() {
1944 // Method for adding checks for flag consistency.
1945 // The intent is to warn the user of all possible conflicts,
1946 // before returning an error.
1947 // Note: Needs platform-dependent factoring.
1948 bool status = true;
1950 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1951 // builds so the cost of stack banging can be measured.
1952 #if (defined(PRODUCT) && defined(SOLARIS))
1953 if (!UseBoundThreads && !UseStackBanging) {
1954 jio_fprintf(defaultStream::error_stream(),
1955 "-UseStackBanging conflicts with -UseBoundThreads\n");
1957 status = false;
1958 }
1959 #endif
1961 if (TLABRefillWasteFraction == 0) {
1962 jio_fprintf(defaultStream::error_stream(),
1963 "TLABRefillWasteFraction should be a denominator, "
1964 "not " SIZE_FORMAT "\n",
1965 TLABRefillWasteFraction);
1966 status = false;
1967 }
1969 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
1970 "AdaptiveSizePolicyWeight");
1971 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1972 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1973 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1975 // Divide by bucket size to prevent a large size from causing rollover when
1976 // calculating amount of memory needed to be allocated for the String table.
1977 status = status && verify_interval(StringTableSize, minimumStringTableSize,
1978 (max_uintx / StringTable::bucket_size()), "StringTable size");
1980 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1981 jio_fprintf(defaultStream::error_stream(),
1982 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1983 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1984 MinHeapFreeRatio, MaxHeapFreeRatio);
1985 status = false;
1986 }
1987 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1988 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1990 // Min/MaxMetaspaceFreeRatio
1991 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
1992 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
1994 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
1995 jio_fprintf(defaultStream::error_stream(),
1996 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
1997 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
1998 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
1999 MinMetaspaceFreeRatio,
2000 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
2001 MaxMetaspaceFreeRatio);
2002 status = false;
2003 }
2005 // Trying to keep 100% free is not practical
2006 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
2008 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
2009 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
2010 }
2012 if (UseParallelOldGC && ParallelOldGCSplitALot) {
2013 // Settings to encourage splitting.
2014 if (!FLAG_IS_CMDLINE(NewRatio)) {
2015 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
2016 }
2017 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
2018 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2019 }
2020 }
2022 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
2023 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
2024 if (GCTimeLimit == 100) {
2025 // Turn off gc-overhead-limit-exceeded checks
2026 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
2027 }
2029 status = status && check_gc_consistency();
2030 status = status && check_stack_pages();
2032 if (CMSIncrementalMode) {
2033 if (!UseConcMarkSweepGC) {
2034 jio_fprintf(defaultStream::error_stream(),
2035 "error: invalid argument combination.\n"
2036 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
2037 "selected in order\nto use CMSIncrementalMode.\n");
2038 status = false;
2039 } else {
2040 status = status && verify_percentage(CMSIncrementalDutyCycle,
2041 "CMSIncrementalDutyCycle");
2042 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
2043 "CMSIncrementalDutyCycleMin");
2044 status = status && verify_percentage(CMSIncrementalSafetyFactor,
2045 "CMSIncrementalSafetyFactor");
2046 status = status && verify_percentage(CMSIncrementalOffset,
2047 "CMSIncrementalOffset");
2048 status = status && verify_percentage(CMSExpAvgFactor,
2049 "CMSExpAvgFactor");
2050 // If it was not set on the command line, set
2051 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2052 if (CMSInitiatingOccupancyFraction < 0) {
2053 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2054 }
2055 }
2056 }
2058 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2059 // insists that we hold the requisite locks so that the iteration is
2060 // MT-safe. For the verification at start-up and shut-down, we don't
2061 // yet have a good way of acquiring and releasing these locks,
2062 // which are not visible at the CollectedHeap level. We want to
2063 // be able to acquire these locks and then do the iteration rather
2064 // than just disable the lock verification. This will be fixed under
2065 // bug 4788986.
2066 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2067 if (VerifyDuringStartup) {
2068 warning("Heap verification at start-up disabled "
2069 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2070 VerifyDuringStartup = false; // Disable verification at start-up
2071 }
2073 if (VerifyBeforeExit) {
2074 warning("Heap verification at shutdown disabled "
2075 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2076 VerifyBeforeExit = false; // Disable verification at shutdown
2077 }
2078 }
2080 // Note: only executed in non-PRODUCT mode
2081 if (!UseAsyncConcMarkSweepGC &&
2082 (ExplicitGCInvokesConcurrent ||
2083 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2084 jio_fprintf(defaultStream::error_stream(),
2085 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2086 " with -UseAsyncConcMarkSweepGC");
2087 status = false;
2088 }
2090 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2092 #if INCLUDE_ALL_GCS
2093 if (UseG1GC) {
2094 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2095 "InitiatingHeapOccupancyPercent");
2096 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2097 "G1RefProcDrainInterval");
2098 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2099 "G1ConcMarkStepDurationMillis");
2100 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2101 "G1ConcRSHotCardLimit");
2102 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2103 "G1ConcRSLogCacheSize");
2104 }
2105 if (UseConcMarkSweepGC) {
2106 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2107 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2108 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2109 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2111 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2113 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2114 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2115 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2117 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2119 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2120 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2122 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2123 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2124 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2126 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2128 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2130 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2131 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2132 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2133 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2134 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2135 }
2137 if (UseParallelGC || UseParallelOldGC) {
2138 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2139 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2141 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2142 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2144 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2145 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2147 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2149 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2150 }
2151 #endif // INCLUDE_ALL_GCS
2153 status = status && verify_interval(RefDiscoveryPolicy,
2154 ReferenceProcessor::DiscoveryPolicyMin,
2155 ReferenceProcessor::DiscoveryPolicyMax,
2156 "RefDiscoveryPolicy");
2158 // Limit the lower bound of this flag to 1 as it is used in a division
2159 // expression.
2160 status = status && verify_interval(TLABWasteTargetPercent,
2161 1, 100, "TLABWasteTargetPercent");
2163 status = status && verify_object_alignment();
2165 status = status && verify_interval(ClassMetaspaceSize, 1*M, 3*G,
2166 "ClassMetaspaceSize");
2168 status = status && verify_interval(MarkStackSizeMax,
2169 1, (max_jint - 1), "MarkStackSizeMax");
2170 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2172 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2174 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2176 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2178 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2179 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2181 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2183 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2184 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2185 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2186 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2188 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2189 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2191 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2192 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2193 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2195 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2196 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2198 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2199 // just for that, so hardcode here.
2200 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2201 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2202 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2203 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2205 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2206 #ifdef SPARC
2207 if (UseConcMarkSweepGC || UseG1GC) {
2208 // Issue a stern warning if the user has explicitly set
2209 // UseMemSetInBOT (it is known to cause issues), but allow
2210 // use for experimentation and debugging.
2211 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2212 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2213 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2214 " on sun4v; please understand that you are using at your own risk!");
2215 }
2216 }
2217 #endif // SPARC
2219 if (PrintNMTStatistics) {
2220 #if INCLUDE_NMT
2221 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2222 #endif // INCLUDE_NMT
2223 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2224 PrintNMTStatistics = false;
2225 #if INCLUDE_NMT
2226 }
2227 #endif
2228 }
2230 // Need to limit the extent of the padding to reasonable size.
2231 // 8K is well beyond the reasonable HW cache line size, even with the
2232 // aggressive prefetching, while still leaving the room for segregating
2233 // among the distinct pages.
2234 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2235 jio_fprintf(defaultStream::error_stream(),
2236 "ContendedPaddingWidth=" INTX_FORMAT " must be the between %d and %d\n",
2237 ContendedPaddingWidth, 0, 8192);
2238 status = false;
2239 }
2241 // Need to enforce the padding not to break the existing field alignments.
2242 // It is sufficient to check against the largest type size.
2243 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2244 jio_fprintf(defaultStream::error_stream(),
2245 "ContendedPaddingWidth=" INTX_FORMAT " must be the multiple of %d\n",
2246 ContendedPaddingWidth, BytesPerLong);
2247 status = false;
2248 }
2250 // Check lower bounds of the code cache
2251 // Template Interpreter code is approximately 3X larger in debug builds.
2252 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace;
2253 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) {
2254 jio_fprintf(defaultStream::error_stream(),
2255 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K,
2256 os::vm_page_size()/K);
2257 status = false;
2258 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) {
2259 jio_fprintf(defaultStream::error_stream(),
2260 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n",
2261 ReservedCodeCacheSize/K, InitialCodeCacheSize/K);
2262 status = false;
2263 } else if (ReservedCodeCacheSize < min_code_cache_size) {
2264 jio_fprintf(defaultStream::error_stream(),
2265 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K,
2266 min_code_cache_size/K);
2267 status = false;
2268 } else if (ReservedCodeCacheSize > 2*G) {
2269 // Code cache size larger than MAXINT is not supported.
2270 jio_fprintf(defaultStream::error_stream(),
2271 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M,
2272 (2*G)/M);
2273 status = false;
2274 }
2275 return status;
2276 }
2278 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2279 const char* option_type) {
2280 if (ignore) return false;
2282 const char* spacer = " ";
2283 if (option_type == NULL) {
2284 option_type = ++spacer; // Set both to the empty string.
2285 }
2287 if (os::obsolete_option(option)) {
2288 jio_fprintf(defaultStream::error_stream(),
2289 "Obsolete %s%soption: %s\n", option_type, spacer,
2290 option->optionString);
2291 return false;
2292 } else {
2293 jio_fprintf(defaultStream::error_stream(),
2294 "Unrecognized %s%soption: %s\n", option_type, spacer,
2295 option->optionString);
2296 return true;
2297 }
2298 }
2300 static const char* user_assertion_options[] = {
2301 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2302 };
2304 static const char* system_assertion_options[] = {
2305 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2306 };
2308 // Return true if any of the strings in null-terminated array 'names' matches.
2309 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2310 // the option must match exactly.
2311 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2312 bool tail_allowed) {
2313 for (/* empty */; *names != NULL; ++names) {
2314 if (match_option(option, *names, tail)) {
2315 if (**tail == '\0' || tail_allowed && **tail == ':') {
2316 return true;
2317 }
2318 }
2319 }
2320 return false;
2321 }
2323 bool Arguments::parse_uintx(const char* value,
2324 uintx* uintx_arg,
2325 uintx min_size) {
2327 // Check the sign first since atomull() parses only unsigned values.
2328 bool value_is_positive = !(*value == '-');
2330 if (value_is_positive) {
2331 julong n;
2332 bool good_return = atomull(value, &n);
2333 if (good_return) {
2334 bool above_minimum = n >= min_size;
2335 bool value_is_too_large = n > max_uintx;
2337 if (above_minimum && !value_is_too_large) {
2338 *uintx_arg = n;
2339 return true;
2340 }
2341 }
2342 }
2343 return false;
2344 }
2346 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2347 julong* long_arg,
2348 julong min_size) {
2349 if (!atomull(s, long_arg)) return arg_unreadable;
2350 return check_memory_size(*long_arg, min_size);
2351 }
2353 // Parse JavaVMInitArgs structure
2355 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2356 // For components of the system classpath.
2357 SysClassPath scp(Arguments::get_sysclasspath());
2358 bool scp_assembly_required = false;
2360 // Save default settings for some mode flags
2361 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2362 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2363 Arguments::_ClipInlining = ClipInlining;
2364 Arguments::_BackgroundCompilation = BackgroundCompilation;
2366 // Setup flags for mixed which is the default
2367 set_mode_flags(_mixed);
2369 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2370 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2371 if (result != JNI_OK) {
2372 return result;
2373 }
2375 // Parse JavaVMInitArgs structure passed in
2376 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2377 if (result != JNI_OK) {
2378 return result;
2379 }
2381 if (AggressiveOpts) {
2382 // Insert alt-rt.jar between user-specified bootclasspath
2383 // prefix and the default bootclasspath. os::set_boot_path()
2384 // uses meta_index_dir as the default bootclasspath directory.
2385 const char* altclasses_jar = "alt-rt.jar";
2386 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2387 strlen(altclasses_jar);
2388 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2389 strcpy(altclasses_path, get_meta_index_dir());
2390 strcat(altclasses_path, altclasses_jar);
2391 scp.add_suffix_to_prefix(altclasses_path);
2392 scp_assembly_required = true;
2393 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2394 }
2396 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2397 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2398 if (result != JNI_OK) {
2399 return result;
2400 }
2402 // Do final processing now that all arguments have been parsed
2403 result = finalize_vm_init_args(&scp, scp_assembly_required);
2404 if (result != JNI_OK) {
2405 return result;
2406 }
2408 return JNI_OK;
2409 }
2411 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2412 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2413 // are dealing with -agentpath (case where name is a path), otherwise with
2414 // -agentlib
2415 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2416 char *_name;
2417 const char *_hprof = "hprof", *_jdwp = "jdwp";
2418 size_t _len_hprof, _len_jdwp, _len_prefix;
2420 if (is_path) {
2421 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2422 return false;
2423 }
2425 _name++; // skip past last path separator
2426 _len_prefix = strlen(JNI_LIB_PREFIX);
2428 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2429 return false;
2430 }
2432 _name += _len_prefix;
2433 _len_hprof = strlen(_hprof);
2434 _len_jdwp = strlen(_jdwp);
2436 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2437 _name += _len_hprof;
2438 }
2439 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2440 _name += _len_jdwp;
2441 }
2442 else {
2443 return false;
2444 }
2446 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2447 return false;
2448 }
2450 return true;
2451 }
2453 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2454 return true;
2455 }
2457 return false;
2458 }
2460 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2461 SysClassPath* scp_p,
2462 bool* scp_assembly_required_p,
2463 FlagValueOrigin origin) {
2464 // Remaining part of option string
2465 const char* tail;
2467 // iterate over arguments
2468 for (int index = 0; index < args->nOptions; index++) {
2469 bool is_absolute_path = false; // for -agentpath vs -agentlib
2471 const JavaVMOption* option = args->options + index;
2473 if (!match_option(option, "-Djava.class.path", &tail) &&
2474 !match_option(option, "-Dsun.java.command", &tail) &&
2475 !match_option(option, "-Dsun.java.launcher", &tail)) {
2477 // add all jvm options to the jvm_args string. This string
2478 // is used later to set the java.vm.args PerfData string constant.
2479 // the -Djava.class.path and the -Dsun.java.command options are
2480 // omitted from jvm_args string as each have their own PerfData
2481 // string constant object.
2482 build_jvm_args(option->optionString);
2483 }
2485 // -verbose:[class/gc/jni]
2486 if (match_option(option, "-verbose", &tail)) {
2487 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2488 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2489 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2490 } else if (!strcmp(tail, ":gc")) {
2491 FLAG_SET_CMDLINE(bool, PrintGC, true);
2492 } else if (!strcmp(tail, ":jni")) {
2493 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2494 }
2495 // -da / -ea / -disableassertions / -enableassertions
2496 // These accept an optional class/package name separated by a colon, e.g.,
2497 // -da:java.lang.Thread.
2498 } else if (match_option(option, user_assertion_options, &tail, true)) {
2499 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2500 if (*tail == '\0') {
2501 JavaAssertions::setUserClassDefault(enable);
2502 } else {
2503 assert(*tail == ':', "bogus match by match_option()");
2504 JavaAssertions::addOption(tail + 1, enable);
2505 }
2506 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2507 } else if (match_option(option, system_assertion_options, &tail, false)) {
2508 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2509 JavaAssertions::setSystemClassDefault(enable);
2510 // -bootclasspath:
2511 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2512 scp_p->reset_path(tail);
2513 *scp_assembly_required_p = true;
2514 // -bootclasspath/a:
2515 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2516 scp_p->add_suffix(tail);
2517 *scp_assembly_required_p = true;
2518 // -bootclasspath/p:
2519 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2520 scp_p->add_prefix(tail);
2521 *scp_assembly_required_p = true;
2522 // -Xrun
2523 } else if (match_option(option, "-Xrun", &tail)) {
2524 if (tail != NULL) {
2525 const char* pos = strchr(tail, ':');
2526 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2527 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2528 name[len] = '\0';
2530 char *options = NULL;
2531 if(pos != NULL) {
2532 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2533 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2534 }
2535 #if !INCLUDE_JVMTI
2536 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2537 jio_fprintf(defaultStream::error_stream(),
2538 "Profiling and debugging agents are not supported in this VM\n");
2539 return JNI_ERR;
2540 }
2541 #endif // !INCLUDE_JVMTI
2542 add_init_library(name, options);
2543 }
2544 // -agentlib and -agentpath
2545 } else if (match_option(option, "-agentlib:", &tail) ||
2546 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2547 if(tail != NULL) {
2548 const char* pos = strchr(tail, '=');
2549 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2550 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2551 name[len] = '\0';
2553 char *options = NULL;
2554 if(pos != NULL) {
2555 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2556 }
2557 #if !INCLUDE_JVMTI
2558 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2559 jio_fprintf(defaultStream::error_stream(),
2560 "Profiling and debugging agents are not supported in this VM\n");
2561 return JNI_ERR;
2562 }
2563 #endif // !INCLUDE_JVMTI
2564 add_init_agent(name, options, is_absolute_path);
2565 }
2566 // -javaagent
2567 } else if (match_option(option, "-javaagent:", &tail)) {
2568 #if !INCLUDE_JVMTI
2569 jio_fprintf(defaultStream::error_stream(),
2570 "Instrumentation agents are not supported in this VM\n");
2571 return JNI_ERR;
2572 #else
2573 if(tail != NULL) {
2574 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2575 add_init_agent("instrument", options, false);
2576 }
2577 #endif // !INCLUDE_JVMTI
2578 // -Xnoclassgc
2579 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2580 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2581 // -Xincgc: i-CMS
2582 } else if (match_option(option, "-Xincgc", &tail)) {
2583 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2584 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2585 // -Xnoincgc: no i-CMS
2586 } else if (match_option(option, "-Xnoincgc", &tail)) {
2587 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2588 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2589 // -Xconcgc
2590 } else if (match_option(option, "-Xconcgc", &tail)) {
2591 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2592 // -Xnoconcgc
2593 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2594 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2595 // -Xbatch
2596 } else if (match_option(option, "-Xbatch", &tail)) {
2597 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2598 // -Xmn for compatibility with other JVM vendors
2599 } else if (match_option(option, "-Xmn", &tail)) {
2600 julong long_initial_eden_size = 0;
2601 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2602 if (errcode != arg_in_range) {
2603 jio_fprintf(defaultStream::error_stream(),
2604 "Invalid initial eden size: %s\n", option->optionString);
2605 describe_range_error(errcode);
2606 return JNI_EINVAL;
2607 }
2608 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2609 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2610 // -Xms
2611 } else if (match_option(option, "-Xms", &tail)) {
2612 julong long_initial_heap_size = 0;
2613 // an initial heap size of 0 means automatically determine
2614 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2615 if (errcode != arg_in_range) {
2616 jio_fprintf(defaultStream::error_stream(),
2617 "Invalid initial heap size: %s\n", option->optionString);
2618 describe_range_error(errcode);
2619 return JNI_EINVAL;
2620 }
2621 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2622 // Currently the minimum size and the initial heap sizes are the same.
2623 set_min_heap_size(InitialHeapSize);
2624 // -Xmx
2625 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2626 julong long_max_heap_size = 0;
2627 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2628 if (errcode != arg_in_range) {
2629 jio_fprintf(defaultStream::error_stream(),
2630 "Invalid maximum heap size: %s\n", option->optionString);
2631 describe_range_error(errcode);
2632 return JNI_EINVAL;
2633 }
2634 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2635 // Xmaxf
2636 } else if (match_option(option, "-Xmaxf", &tail)) {
2637 int maxf = (int)(atof(tail) * 100);
2638 if (maxf < 0 || maxf > 100) {
2639 jio_fprintf(defaultStream::error_stream(),
2640 "Bad max heap free percentage size: %s\n",
2641 option->optionString);
2642 return JNI_EINVAL;
2643 } else {
2644 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2645 }
2646 // Xminf
2647 } else if (match_option(option, "-Xminf", &tail)) {
2648 int minf = (int)(atof(tail) * 100);
2649 if (minf < 0 || minf > 100) {
2650 jio_fprintf(defaultStream::error_stream(),
2651 "Bad min heap free percentage size: %s\n",
2652 option->optionString);
2653 return JNI_EINVAL;
2654 } else {
2655 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2656 }
2657 // -Xss
2658 } else if (match_option(option, "-Xss", &tail)) {
2659 julong long_ThreadStackSize = 0;
2660 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2661 if (errcode != arg_in_range) {
2662 jio_fprintf(defaultStream::error_stream(),
2663 "Invalid thread stack size: %s\n", option->optionString);
2664 describe_range_error(errcode);
2665 return JNI_EINVAL;
2666 }
2667 // Internally track ThreadStackSize in units of 1024 bytes.
2668 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2669 round_to((int)long_ThreadStackSize, K) / K);
2670 // -Xoss
2671 } else if (match_option(option, "-Xoss", &tail)) {
2672 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2673 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) {
2674 julong long_CodeCacheExpansionSize = 0;
2675 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size());
2676 if (errcode != arg_in_range) {
2677 jio_fprintf(defaultStream::error_stream(),
2678 "Invalid argument: %s. Must be at least %luK.\n", option->optionString,
2679 os::vm_page_size()/K);
2680 return JNI_EINVAL;
2681 }
2682 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize);
2683 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2684 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2685 julong long_ReservedCodeCacheSize = 0;
2687 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1);
2688 if (errcode != arg_in_range) {
2689 jio_fprintf(defaultStream::error_stream(),
2690 "Invalid maximum code cache size: %s.\n", option->optionString);
2691 return JNI_EINVAL;
2692 }
2693 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2694 //-XX:IncreaseFirstTierCompileThresholdAt=
2695 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2696 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2697 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2698 jio_fprintf(defaultStream::error_stream(),
2699 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2700 option->optionString);
2701 return JNI_EINVAL;
2702 }
2703 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2704 // -green
2705 } else if (match_option(option, "-green", &tail)) {
2706 jio_fprintf(defaultStream::error_stream(),
2707 "Green threads support not available\n");
2708 return JNI_EINVAL;
2709 // -native
2710 } else if (match_option(option, "-native", &tail)) {
2711 // HotSpot always uses native threads, ignore silently for compatibility
2712 // -Xsqnopause
2713 } else if (match_option(option, "-Xsqnopause", &tail)) {
2714 // EVM option, ignore silently for compatibility
2715 // -Xrs
2716 } else if (match_option(option, "-Xrs", &tail)) {
2717 // Classic/EVM option, new functionality
2718 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2719 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2720 // change default internal VM signals used - lower case for back compat
2721 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2722 // -Xoptimize
2723 } else if (match_option(option, "-Xoptimize", &tail)) {
2724 // EVM option, ignore silently for compatibility
2725 // -Xprof
2726 } else if (match_option(option, "-Xprof", &tail)) {
2727 #if INCLUDE_FPROF
2728 _has_profile = true;
2729 #else // INCLUDE_FPROF
2730 jio_fprintf(defaultStream::error_stream(),
2731 "Flat profiling is not supported in this VM.\n");
2732 return JNI_ERR;
2733 #endif // INCLUDE_FPROF
2734 // -Xconcurrentio
2735 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2736 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2737 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2738 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2739 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2740 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2742 // -Xinternalversion
2743 } else if (match_option(option, "-Xinternalversion", &tail)) {
2744 jio_fprintf(defaultStream::output_stream(), "%s\n",
2745 VM_Version::internal_vm_info_string());
2746 vm_exit(0);
2747 #ifndef PRODUCT
2748 // -Xprintflags
2749 } else if (match_option(option, "-Xprintflags", &tail)) {
2750 CommandLineFlags::printFlags(tty, false);
2751 vm_exit(0);
2752 #endif
2753 // -D
2754 } else if (match_option(option, "-D", &tail)) {
2755 if (!add_property(tail)) {
2756 return JNI_ENOMEM;
2757 }
2758 // Out of the box management support
2759 if (match_option(option, "-Dcom.sun.management", &tail)) {
2760 #if INCLUDE_MANAGEMENT
2761 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2762 #else
2763 jio_fprintf(defaultStream::output_stream(),
2764 "-Dcom.sun.management is not supported in this VM.\n");
2765 return JNI_ERR;
2766 #endif
2767 }
2768 // -Xint
2769 } else if (match_option(option, "-Xint", &tail)) {
2770 set_mode_flags(_int);
2771 // -Xmixed
2772 } else if (match_option(option, "-Xmixed", &tail)) {
2773 set_mode_flags(_mixed);
2774 // -Xcomp
2775 } else if (match_option(option, "-Xcomp", &tail)) {
2776 // for testing the compiler; turn off all flags that inhibit compilation
2777 set_mode_flags(_comp);
2778 // -Xshare:dump
2779 } else if (match_option(option, "-Xshare:dump", &tail)) {
2780 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2781 set_mode_flags(_int); // Prevent compilation, which creates objects
2782 // -Xshare:on
2783 } else if (match_option(option, "-Xshare:on", &tail)) {
2784 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2785 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2786 // -Xshare:auto
2787 } else if (match_option(option, "-Xshare:auto", &tail)) {
2788 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2789 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2790 // -Xshare:off
2791 } else if (match_option(option, "-Xshare:off", &tail)) {
2792 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2793 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2794 // -Xverify
2795 } else if (match_option(option, "-Xverify", &tail)) {
2796 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2797 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2798 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2799 } else if (strcmp(tail, ":remote") == 0) {
2800 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2801 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2802 } else if (strcmp(tail, ":none") == 0) {
2803 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2804 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2805 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2806 return JNI_EINVAL;
2807 }
2808 // -Xdebug
2809 } else if (match_option(option, "-Xdebug", &tail)) {
2810 // note this flag has been used, then ignore
2811 set_xdebug_mode(true);
2812 // -Xnoagent
2813 } else if (match_option(option, "-Xnoagent", &tail)) {
2814 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2815 } else if (match_option(option, "-Xboundthreads", &tail)) {
2816 // Bind user level threads to kernel threads (Solaris only)
2817 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2818 } else if (match_option(option, "-Xloggc:", &tail)) {
2819 // Redirect GC output to the file. -Xloggc:<filename>
2820 // ostream_init_log(), when called will use this filename
2821 // to initialize a fileStream.
2822 _gc_log_filename = strdup(tail);
2823 FLAG_SET_CMDLINE(bool, PrintGC, true);
2824 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2826 // JNI hooks
2827 } else if (match_option(option, "-Xcheck", &tail)) {
2828 if (!strcmp(tail, ":jni")) {
2829 #if !INCLUDE_JNI_CHECK
2830 warning("JNI CHECKING is not supported in this VM");
2831 #else
2832 CheckJNICalls = true;
2833 #endif // INCLUDE_JNI_CHECK
2834 } else if (is_bad_option(option, args->ignoreUnrecognized,
2835 "check")) {
2836 return JNI_EINVAL;
2837 }
2838 } else if (match_option(option, "vfprintf", &tail)) {
2839 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2840 } else if (match_option(option, "exit", &tail)) {
2841 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2842 } else if (match_option(option, "abort", &tail)) {
2843 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2844 // -XX:+AggressiveHeap
2845 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2847 // This option inspects the machine and attempts to set various
2848 // parameters to be optimal for long-running, memory allocation
2849 // intensive jobs. It is intended for machines with large
2850 // amounts of cpu and memory.
2852 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2853 // VM, but we may not be able to represent the total physical memory
2854 // available (like having 8gb of memory on a box but using a 32bit VM).
2855 // Thus, we need to make sure we're using a julong for intermediate
2856 // calculations.
2857 julong initHeapSize;
2858 julong total_memory = os::physical_memory();
2860 if (total_memory < (julong)256*M) {
2861 jio_fprintf(defaultStream::error_stream(),
2862 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2863 vm_exit(1);
2864 }
2866 // The heap size is half of available memory, or (at most)
2867 // all of possible memory less 160mb (leaving room for the OS
2868 // when using ISM). This is the maximum; because adaptive sizing
2869 // is turned on below, the actual space used may be smaller.
2871 initHeapSize = MIN2(total_memory / (julong)2,
2872 total_memory - (julong)160*M);
2874 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2876 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2877 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2878 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2879 // Currently the minimum size and the initial heap sizes are the same.
2880 set_min_heap_size(initHeapSize);
2881 }
2882 if (FLAG_IS_DEFAULT(NewSize)) {
2883 // Make the young generation 3/8ths of the total heap.
2884 FLAG_SET_CMDLINE(uintx, NewSize,
2885 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2886 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2887 }
2889 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2890 FLAG_SET_DEFAULT(UseLargePages, true);
2891 #endif
2893 // Increase some data structure sizes for efficiency
2894 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2895 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2896 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2898 // See the OldPLABSize comment below, but replace 'after promotion'
2899 // with 'after copying'. YoungPLABSize is the size of the survivor
2900 // space per-gc-thread buffers. The default is 4kw.
2901 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2903 // OldPLABSize is the size of the buffers in the old gen that
2904 // UseParallelGC uses to promote live data that doesn't fit in the
2905 // survivor spaces. At any given time, there's one for each gc thread.
2906 // The default size is 1kw. These buffers are rarely used, since the
2907 // survivor spaces are usually big enough. For specjbb, however, there
2908 // are occasions when there's lots of live data in the young gen
2909 // and we end up promoting some of it. We don't have a definite
2910 // explanation for why bumping OldPLABSize helps, but the theory
2911 // is that a bigger PLAB results in retaining something like the
2912 // original allocation order after promotion, which improves mutator
2913 // locality. A minor effect may be that larger PLABs reduce the
2914 // number of PLAB allocation events during gc. The value of 8kw
2915 // was arrived at by experimenting with specjbb.
2916 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2918 // Enable parallel GC and adaptive generation sizing
2919 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2920 FLAG_SET_DEFAULT(ParallelGCThreads,
2921 Abstract_VM_Version::parallel_worker_threads());
2923 // Encourage steady state memory management
2924 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2926 // This appears to improve mutator locality
2927 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2929 // Get around early Solaris scheduling bug
2930 // (affinity vs other jobs on system)
2931 // but disallow DR and offlining (5008695).
2932 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2934 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2935 // The last option must always win.
2936 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2937 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2938 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2939 // The last option must always win.
2940 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2941 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2942 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2943 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2944 jio_fprintf(defaultStream::error_stream(),
2945 "Please use CMSClassUnloadingEnabled in place of "
2946 "CMSPermGenSweepingEnabled in the future\n");
2947 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2948 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2949 jio_fprintf(defaultStream::error_stream(),
2950 "Please use -XX:+UseGCOverheadLimit in place of "
2951 "-XX:+UseGCTimeLimit in the future\n");
2952 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2953 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2954 jio_fprintf(defaultStream::error_stream(),
2955 "Please use -XX:-UseGCOverheadLimit in place of "
2956 "-XX:-UseGCTimeLimit in the future\n");
2957 // The TLE options are for compatibility with 1.3 and will be
2958 // removed without notice in a future release. These options
2959 // are not to be documented.
2960 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2961 // No longer used.
2962 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2963 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2964 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2965 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2966 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2967 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2968 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2969 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2970 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2971 // No longer used.
2972 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2973 julong long_tlab_size = 0;
2974 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2975 if (errcode != arg_in_range) {
2976 jio_fprintf(defaultStream::error_stream(),
2977 "Invalid TLAB size: %s\n", option->optionString);
2978 describe_range_error(errcode);
2979 return JNI_EINVAL;
2980 }
2981 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2982 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2983 // No longer used.
2984 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2985 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2986 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2987 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2988 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2989 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2990 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2991 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2992 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2993 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2994 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2995 #if defined(DTRACE_ENABLED)
2996 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2997 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2998 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2999 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
3000 #else // defined(DTRACE_ENABLED)
3001 jio_fprintf(defaultStream::error_stream(),
3002 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
3003 return JNI_EINVAL;
3004 #endif // defined(DTRACE_ENABLED)
3005 #ifdef ASSERT
3006 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
3007 FLAG_SET_CMDLINE(bool, FullGCALot, true);
3008 // disable scavenge before parallel mark-compact
3009 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
3010 #endif
3011 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
3012 julong cms_blocks_to_claim = (julong)atol(tail);
3013 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3014 jio_fprintf(defaultStream::error_stream(),
3015 "Please use -XX:OldPLABSize in place of "
3016 "-XX:CMSParPromoteBlocksToClaim in the future\n");
3017 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
3018 julong cms_blocks_to_claim = (julong)atol(tail);
3019 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
3020 jio_fprintf(defaultStream::error_stream(),
3021 "Please use -XX:OldPLABSize in place of "
3022 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
3023 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
3024 julong old_plab_size = 0;
3025 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
3026 if (errcode != arg_in_range) {
3027 jio_fprintf(defaultStream::error_stream(),
3028 "Invalid old PLAB size: %s\n", option->optionString);
3029 describe_range_error(errcode);
3030 return JNI_EINVAL;
3031 }
3032 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
3033 jio_fprintf(defaultStream::error_stream(),
3034 "Please use -XX:OldPLABSize in place of "
3035 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
3036 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
3037 julong young_plab_size = 0;
3038 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
3039 if (errcode != arg_in_range) {
3040 jio_fprintf(defaultStream::error_stream(),
3041 "Invalid young PLAB size: %s\n", option->optionString);
3042 describe_range_error(errcode);
3043 return JNI_EINVAL;
3044 }
3045 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
3046 jio_fprintf(defaultStream::error_stream(),
3047 "Please use -XX:YoungPLABSize in place of "
3048 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
3049 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
3050 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
3051 julong stack_size = 0;
3052 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
3053 if (errcode != arg_in_range) {
3054 jio_fprintf(defaultStream::error_stream(),
3055 "Invalid mark stack size: %s\n", option->optionString);
3056 describe_range_error(errcode);
3057 return JNI_EINVAL;
3058 }
3059 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
3060 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
3061 julong max_stack_size = 0;
3062 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
3063 if (errcode != arg_in_range) {
3064 jio_fprintf(defaultStream::error_stream(),
3065 "Invalid maximum mark stack size: %s\n",
3066 option->optionString);
3067 describe_range_error(errcode);
3068 return JNI_EINVAL;
3069 }
3070 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
3071 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
3072 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3073 uintx conc_threads = 0;
3074 if (!parse_uintx(tail, &conc_threads, 1)) {
3075 jio_fprintf(defaultStream::error_stream(),
3076 "Invalid concurrent threads: %s\n", option->optionString);
3077 return JNI_EINVAL;
3078 }
3079 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3080 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3081 julong max_direct_memory_size = 0;
3082 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3083 if (errcode != arg_in_range) {
3084 jio_fprintf(defaultStream::error_stream(),
3085 "Invalid maximum direct memory size: %s\n",
3086 option->optionString);
3087 describe_range_error(errcode);
3088 return JNI_EINVAL;
3089 }
3090 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3091 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3092 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3093 // away and will cause VM initialization failures!
3094 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3095 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3096 #if !INCLUDE_MANAGEMENT
3097 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3098 jio_fprintf(defaultStream::error_stream(),
3099 "ManagementServer is not supported in this VM.\n");
3100 return JNI_ERR;
3101 #endif // INCLUDE_MANAGEMENT
3102 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3103 // Skip -XX:Flags= since that case has already been handled
3104 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3105 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3106 return JNI_EINVAL;
3107 }
3108 }
3109 // Unknown option
3110 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3111 return JNI_ERR;
3112 }
3113 }
3115 // Change the default value for flags which have different default values
3116 // when working with older JDKs.
3117 #ifdef LINUX
3118 if (JDK_Version::current().compare_major(6) <= 0 &&
3119 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3120 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3121 }
3122 #endif // LINUX
3123 return JNI_OK;
3124 }
3126 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3127 // This must be done after all -D arguments have been processed.
3128 scp_p->expand_endorsed();
3130 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3131 // Assemble the bootclasspath elements into the final path.
3132 Arguments::set_sysclasspath(scp_p->combined_path());
3133 }
3135 // This must be done after all arguments have been processed.
3136 // java_compiler() true means set to "NONE" or empty.
3137 if (java_compiler() && !xdebug_mode()) {
3138 // For backwards compatibility, we switch to interpreted mode if
3139 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3140 // not specified.
3141 set_mode_flags(_int);
3142 }
3143 if (CompileThreshold == 0) {
3144 set_mode_flags(_int);
3145 }
3147 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3148 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3149 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3150 }
3152 #ifndef COMPILER2
3153 // Don't degrade server performance for footprint
3154 if (FLAG_IS_DEFAULT(UseLargePages) &&
3155 MaxHeapSize < LargePageHeapSizeThreshold) {
3156 // No need for large granularity pages w/small heaps.
3157 // Note that large pages are enabled/disabled for both the
3158 // Java heap and the code cache.
3159 FLAG_SET_DEFAULT(UseLargePages, false);
3160 }
3162 #else
3163 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3164 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3165 }
3166 #endif
3168 #ifndef TIERED
3169 // Tiered compilation is undefined.
3170 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation");
3171 #endif
3173 // If we are running in a headless jre, force java.awt.headless property
3174 // to be true unless the property has already been set.
3175 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3176 if (os::is_headless_jre()) {
3177 const char* headless = Arguments::get_property("java.awt.headless");
3178 if (headless == NULL) {
3179 char envbuffer[128];
3180 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3181 if (!add_property("java.awt.headless=true")) {
3182 return JNI_ENOMEM;
3183 }
3184 } else {
3185 char buffer[256];
3186 strcpy(buffer, "java.awt.headless=");
3187 strcat(buffer, envbuffer);
3188 if (!add_property(buffer)) {
3189 return JNI_ENOMEM;
3190 }
3191 }
3192 }
3193 }
3195 if (!check_vm_args_consistency()) {
3196 return JNI_ERR;
3197 }
3199 return JNI_OK;
3200 }
3202 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3203 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3204 scp_assembly_required_p);
3205 }
3207 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3208 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3209 scp_assembly_required_p);
3210 }
3212 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3213 const int N_MAX_OPTIONS = 64;
3214 const int OPTION_BUFFER_SIZE = 1024;
3215 char buffer[OPTION_BUFFER_SIZE];
3217 // The variable will be ignored if it exceeds the length of the buffer.
3218 // Don't check this variable if user has special privileges
3219 // (e.g. unix su command).
3220 if (os::getenv(name, buffer, sizeof(buffer)) &&
3221 !os::have_special_privileges()) {
3222 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3223 jio_fprintf(defaultStream::error_stream(),
3224 "Picked up %s: %s\n", name, buffer);
3225 char* rd = buffer; // pointer to the input string (rd)
3226 int i;
3227 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3228 while (isspace(*rd)) rd++; // skip whitespace
3229 if (*rd == 0) break; // we re done when the input string is read completely
3231 // The output, option string, overwrites the input string.
3232 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3233 // input string (rd).
3234 char* wrt = rd;
3236 options[i++].optionString = wrt; // Fill in option
3237 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3238 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3239 int quote = *rd; // matching quote to look for
3240 rd++; // don't copy open quote
3241 while (*rd != quote) { // include everything (even spaces) up until quote
3242 if (*rd == 0) { // string termination means unmatched string
3243 jio_fprintf(defaultStream::error_stream(),
3244 "Unmatched quote in %s\n", name);
3245 return JNI_ERR;
3246 }
3247 *wrt++ = *rd++; // copy to option string
3248 }
3249 rd++; // don't copy close quote
3250 } else {
3251 *wrt++ = *rd++; // copy to option string
3252 }
3253 }
3254 // Need to check if we're done before writing a NULL,
3255 // because the write could be to the byte that rd is pointing to.
3256 if (*rd++ == 0) {
3257 *wrt = 0;
3258 break;
3259 }
3260 *wrt = 0; // Zero terminate option
3261 }
3262 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3263 JavaVMInitArgs vm_args;
3264 vm_args.version = JNI_VERSION_1_2;
3265 vm_args.options = options;
3266 vm_args.nOptions = i;
3267 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3269 if (PrintVMOptions) {
3270 const char* tail;
3271 for (int i = 0; i < vm_args.nOptions; i++) {
3272 const JavaVMOption *option = vm_args.options + i;
3273 if (match_option(option, "-XX:", &tail)) {
3274 logOption(tail);
3275 }
3276 }
3277 }
3279 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
3280 }
3281 return JNI_OK;
3282 }
3284 void Arguments::set_shared_spaces_flags() {
3285 if (DumpSharedSpaces) {
3286 if (RequireSharedSpaces) {
3287 warning("cannot dump shared archive while using shared archive");
3288 }
3289 UseSharedSpaces = false;
3290 #ifdef _LP64
3291 if (!UseCompressedOops || !UseCompressedKlassPointers) {
3292 vm_exit_during_initialization(
3293 "Cannot dump shared archive when UseCompressedOops or UseCompressedKlassPointers is off.", NULL);
3294 }
3295 } else {
3296 // UseCompressedOops and UseCompressedKlassPointers must be on for UseSharedSpaces.
3297 if (!UseCompressedOops || !UseCompressedKlassPointers) {
3298 no_shared_spaces();
3299 }
3300 #endif
3301 }
3302 }
3304 #if !INCLUDE_ALL_GCS
3305 static void force_serial_gc() {
3306 FLAG_SET_DEFAULT(UseSerialGC, true);
3307 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3308 UNSUPPORTED_GC_OPTION(UseG1GC);
3309 UNSUPPORTED_GC_OPTION(UseParallelGC);
3310 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3311 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3312 UNSUPPORTED_GC_OPTION(UseParNewGC);
3313 }
3314 #endif // INCLUDE_ALL_GCS
3316 // Sharing support
3317 // Construct the path to the archive
3318 static char* get_shared_archive_path() {
3319 char *shared_archive_path;
3320 if (SharedArchiveFile == NULL) {
3321 char jvm_path[JVM_MAXPATHLEN];
3322 os::jvm_path(jvm_path, sizeof(jvm_path));
3323 char *end = strrchr(jvm_path, *os::file_separator());
3324 if (end != NULL) *end = '\0';
3325 size_t jvm_path_len = strlen(jvm_path);
3326 size_t file_sep_len = strlen(os::file_separator());
3327 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3328 file_sep_len + 20, mtInternal);
3329 if (shared_archive_path != NULL) {
3330 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3331 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3332 strncat(shared_archive_path, "classes.jsa", 11);
3333 }
3334 } else {
3335 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3336 if (shared_archive_path != NULL) {
3337 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3338 }
3339 }
3340 return shared_archive_path;
3341 }
3343 // Parse entry point called from JNI_CreateJavaVM
3345 jint Arguments::parse(const JavaVMInitArgs* args) {
3347 // Remaining part of option string
3348 const char* tail;
3350 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3351 const char* hotspotrc = ".hotspotrc";
3352 bool settings_file_specified = false;
3353 bool needs_hotspotrc_warning = false;
3355 const char* flags_file;
3356 int index;
3357 for (index = 0; index < args->nOptions; index++) {
3358 const JavaVMOption *option = args->options + index;
3359 if (match_option(option, "-XX:Flags=", &tail)) {
3360 flags_file = tail;
3361 settings_file_specified = true;
3362 }
3363 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3364 PrintVMOptions = true;
3365 }
3366 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3367 PrintVMOptions = false;
3368 }
3369 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3370 IgnoreUnrecognizedVMOptions = true;
3371 }
3372 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3373 IgnoreUnrecognizedVMOptions = false;
3374 }
3375 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3376 CommandLineFlags::printFlags(tty, false);
3377 vm_exit(0);
3378 }
3379 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3380 #if INCLUDE_NMT
3381 MemTracker::init_tracking_options(tail);
3382 #else
3383 jio_fprintf(defaultStream::error_stream(),
3384 "Native Memory Tracking is not supported in this VM\n");
3385 return JNI_ERR;
3386 #endif
3387 }
3390 #ifndef PRODUCT
3391 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3392 CommandLineFlags::printFlags(tty, true);
3393 vm_exit(0);
3394 }
3395 #endif
3396 }
3398 if (IgnoreUnrecognizedVMOptions) {
3399 // uncast const to modify the flag args->ignoreUnrecognized
3400 *(jboolean*)(&args->ignoreUnrecognized) = true;
3401 }
3403 // Parse specified settings file
3404 if (settings_file_specified) {
3405 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3406 return JNI_EINVAL;
3407 }
3408 } else {
3409 #ifdef ASSERT
3410 // Parse default .hotspotrc settings file
3411 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3412 return JNI_EINVAL;
3413 }
3414 #else
3415 struct stat buf;
3416 if (os::stat(hotspotrc, &buf) == 0) {
3417 needs_hotspotrc_warning = true;
3418 }
3419 #endif
3420 }
3422 if (PrintVMOptions) {
3423 for (index = 0; index < args->nOptions; index++) {
3424 const JavaVMOption *option = args->options + index;
3425 if (match_option(option, "-XX:", &tail)) {
3426 logOption(tail);
3427 }
3428 }
3429 }
3431 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3432 jint result = parse_vm_init_args(args);
3433 if (result != JNI_OK) {
3434 return result;
3435 }
3437 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3438 SharedArchivePath = get_shared_archive_path();
3439 if (SharedArchivePath == NULL) {
3440 return JNI_ENOMEM;
3441 }
3443 // Delay warning until here so that we've had a chance to process
3444 // the -XX:-PrintWarnings flag
3445 if (needs_hotspotrc_warning) {
3446 warning("%s file is present but has been ignored. "
3447 "Run with -XX:Flags=%s to load the file.",
3448 hotspotrc, hotspotrc);
3449 }
3451 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3452 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3453 #endif
3455 #if INCLUDE_ALL_GCS
3456 #if (defined JAVASE_EMBEDDED || defined ARM)
3457 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3458 #endif
3459 #endif
3461 #ifndef PRODUCT
3462 if (TraceBytecodesAt != 0) {
3463 TraceBytecodes = true;
3464 }
3465 if (CountCompiledCalls) {
3466 if (UseCounterDecay) {
3467 warning("UseCounterDecay disabled because CountCalls is set");
3468 UseCounterDecay = false;
3469 }
3470 }
3471 #endif // PRODUCT
3473 // JSR 292 is not supported before 1.7
3474 if (!JDK_Version::is_gte_jdk17x_version()) {
3475 if (EnableInvokeDynamic) {
3476 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3477 warning("JSR 292 is not supported before 1.7. Disabling support.");
3478 }
3479 EnableInvokeDynamic = false;
3480 }
3481 }
3483 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3484 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3485 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3486 }
3487 ScavengeRootsInCode = 1;
3488 }
3490 if (PrintGCDetails) {
3491 // Turn on -verbose:gc options as well
3492 PrintGC = true;
3493 }
3495 if (!JDK_Version::is_gte_jdk18x_version()) {
3496 // To avoid changing the log format for 7 updates this flag is only
3497 // true by default in JDK8 and above.
3498 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3499 FLAG_SET_DEFAULT(PrintGCCause, false);
3500 }
3501 }
3503 // Set object alignment values.
3504 set_object_alignment();
3506 #if !INCLUDE_ALL_GCS
3507 force_serial_gc();
3508 #endif // INCLUDE_ALL_GCS
3509 #if !INCLUDE_CDS
3510 if (DumpSharedSpaces || RequireSharedSpaces) {
3511 jio_fprintf(defaultStream::error_stream(),
3512 "Shared spaces are not supported in this VM\n");
3513 return JNI_ERR;
3514 }
3515 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3516 warning("Shared spaces are not supported in this VM");
3517 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3518 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3519 }
3520 no_shared_spaces();
3521 #endif // INCLUDE_CDS
3523 // Set flags based on ergonomics.
3524 set_ergonomics_flags();
3526 set_shared_spaces_flags();
3528 // Check the GC selections again.
3529 if (!check_gc_consistency()) {
3530 return JNI_EINVAL;
3531 }
3533 if (TieredCompilation) {
3534 set_tiered_flags();
3535 } else {
3536 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3537 if (CompilationPolicyChoice >= 2) {
3538 vm_exit_during_initialization(
3539 "Incompatible compilation policy selected", NULL);
3540 }
3541 }
3543 set_heap_base_min_address();
3545 // Set heap size based on available physical memory
3546 set_heap_size();
3548 #if INCLUDE_ALL_GCS
3549 // Set per-collector flags
3550 if (UseParallelGC || UseParallelOldGC) {
3551 set_parallel_gc_flags();
3552 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3553 set_cms_and_parnew_gc_flags();
3554 } else if (UseParNewGC) { // skipped if CMS is set above
3555 set_parnew_gc_flags();
3556 } else if (UseG1GC) {
3557 set_g1_gc_flags();
3558 }
3559 check_deprecated_gcs();
3560 check_deprecated_gc_flags();
3561 if (AssumeMP && !UseSerialGC) {
3562 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3563 warning("If the number of processors is expected to increase from one, then"
3564 " you should configure the number of parallel GC threads appropriately"
3565 " using -XX:ParallelGCThreads=N");
3566 }
3567 }
3568 #else // INCLUDE_ALL_GCS
3569 assert(verify_serial_gc_flags(), "SerialGC unset");
3570 #endif // INCLUDE_ALL_GCS
3572 // Set bytecode rewriting flags
3573 set_bytecode_flags();
3575 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3576 set_aggressive_opts_flags();
3578 // Turn off biased locking for locking debug mode flags,
3579 // which are subtlely different from each other but neither works with
3580 // biased locking.
3581 if (UseHeavyMonitors
3582 #ifdef COMPILER1
3583 || !UseFastLocking
3584 #endif // COMPILER1
3585 ) {
3586 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3587 // flag set to true on command line; warn the user that they
3588 // can't enable biased locking here
3589 warning("Biased Locking is not supported with locking debug flags"
3590 "; ignoring UseBiasedLocking flag." );
3591 }
3592 UseBiasedLocking = false;
3593 }
3595 #ifdef CC_INTERP
3596 // Clear flags not supported by the C++ interpreter
3597 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3598 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3599 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3600 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
3601 #endif // CC_INTERP
3603 #ifdef COMPILER2
3604 if (!UseBiasedLocking || EmitSync != 0) {
3605 UseOptoBiasInlining = false;
3606 }
3607 if (!EliminateLocks) {
3608 EliminateNestedLocks = false;
3609 }
3610 if (!Inline) {
3611 IncrementalInline = false;
3612 }
3613 #ifndef PRODUCT
3614 if (!IncrementalInline) {
3615 AlwaysIncrementalInline = false;
3616 }
3617 #endif
3618 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3619 // incremental inlining: bump MaxNodeLimit
3620 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3621 }
3622 #endif
3624 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3625 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3626 DebugNonSafepoints = true;
3627 }
3629 #ifndef PRODUCT
3630 if (CompileTheWorld) {
3631 // Force NmethodSweeper to sweep whole CodeCache each time.
3632 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3633 NmethodSweepFraction = 1;
3634 }
3635 }
3636 #endif
3638 if (PrintCommandLineFlags) {
3639 CommandLineFlags::printSetFlags(tty);
3640 }
3642 // Apply CPU specific policy for the BiasedLocking
3643 if (UseBiasedLocking) {
3644 if (!VM_Version::use_biased_locking() &&
3645 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3646 UseBiasedLocking = false;
3647 }
3648 }
3650 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3651 // but only if not already set on the commandline
3652 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3653 bool set = false;
3654 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3655 if (!set) {
3656 FLAG_SET_DEFAULT(PauseAtExit, true);
3657 }
3658 }
3660 return JNI_OK;
3661 }
3663 jint Arguments::adjust_after_os() {
3664 #if INCLUDE_ALL_GCS
3665 if (UseParallelGC || UseParallelOldGC) {
3666 if (UseNUMA) {
3667 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3668 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3669 }
3670 // For those collectors or operating systems (eg, Windows) that do
3671 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3672 UseNUMAInterleaving = true;
3673 }
3674 }
3675 #endif // INCLUDE_ALL_GCS
3676 return JNI_OK;
3677 }
3679 int Arguments::PropertyList_count(SystemProperty* pl) {
3680 int count = 0;
3681 while(pl != NULL) {
3682 count++;
3683 pl = pl->next();
3684 }
3685 return count;
3686 }
3688 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3689 assert(key != NULL, "just checking");
3690 SystemProperty* prop;
3691 for (prop = pl; prop != NULL; prop = prop->next()) {
3692 if (strcmp(key, prop->key()) == 0) return prop->value();
3693 }
3694 return NULL;
3695 }
3697 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3698 int count = 0;
3699 const char* ret_val = NULL;
3701 while(pl != NULL) {
3702 if(count >= index) {
3703 ret_val = pl->key();
3704 break;
3705 }
3706 count++;
3707 pl = pl->next();
3708 }
3710 return ret_val;
3711 }
3713 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3714 int count = 0;
3715 char* ret_val = NULL;
3717 while(pl != NULL) {
3718 if(count >= index) {
3719 ret_val = pl->value();
3720 break;
3721 }
3722 count++;
3723 pl = pl->next();
3724 }
3726 return ret_val;
3727 }
3729 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3730 SystemProperty* p = *plist;
3731 if (p == NULL) {
3732 *plist = new_p;
3733 } else {
3734 while (p->next() != NULL) {
3735 p = p->next();
3736 }
3737 p->set_next(new_p);
3738 }
3739 }
3741 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3742 if (plist == NULL)
3743 return;
3745 SystemProperty* new_p = new SystemProperty(k, v, true);
3746 PropertyList_add(plist, new_p);
3747 }
3749 // This add maintains unique property key in the list.
3750 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3751 if (plist == NULL)
3752 return;
3754 // If property key exist then update with new value.
3755 SystemProperty* prop;
3756 for (prop = *plist; prop != NULL; prop = prop->next()) {
3757 if (strcmp(k, prop->key()) == 0) {
3758 if (append) {
3759 prop->append_value(v);
3760 } else {
3761 prop->set_value(v);
3762 }
3763 return;
3764 }
3765 }
3767 PropertyList_add(plist, k, v);
3768 }
3770 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3771 // Returns true if all of the source pointed by src has been copied over to
3772 // the destination buffer pointed by buf. Otherwise, returns false.
3773 // Notes:
3774 // 1. If the length (buflen) of the destination buffer excluding the
3775 // NULL terminator character is not long enough for holding the expanded
3776 // pid characters, it also returns false instead of returning the partially
3777 // expanded one.
3778 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3779 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3780 char* buf, size_t buflen) {
3781 const char* p = src;
3782 char* b = buf;
3783 const char* src_end = &src[srclen];
3784 char* buf_end = &buf[buflen - 1];
3786 while (p < src_end && b < buf_end) {
3787 if (*p == '%') {
3788 switch (*(++p)) {
3789 case '%': // "%%" ==> "%"
3790 *b++ = *p++;
3791 break;
3792 case 'p': { // "%p" ==> current process id
3793 // buf_end points to the character before the last character so
3794 // that we could write '\0' to the end of the buffer.
3795 size_t buf_sz = buf_end - b + 1;
3796 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3798 // if jio_snprintf fails or the buffer is not long enough to hold
3799 // the expanded pid, returns false.
3800 if (ret < 0 || ret >= (int)buf_sz) {
3801 return false;
3802 } else {
3803 b += ret;
3804 assert(*b == '\0', "fail in copy_expand_pid");
3805 if (p == src_end && b == buf_end + 1) {
3806 // reach the end of the buffer.
3807 return true;
3808 }
3809 }
3810 p++;
3811 break;
3812 }
3813 default :
3814 *b++ = '%';
3815 }
3816 } else {
3817 *b++ = *p++;
3818 }
3819 }
3820 *b = '\0';
3821 return (p == src_end); // return false if not all of the source was copied
3822 }
