1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "compiler/compilerOracle.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/cardTableRS.hpp"
31 #include "memory/referenceProcessor.hpp"
32 #include "memory/universe.inline.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "prims/jvmtiExport.hpp"
35 #include "runtime/arguments.hpp"
36 #include "runtime/globals_extension.hpp"
37 #include "runtime/java.hpp"
38 #include "services/management.hpp"
39 #include "services/memTracker.hpp"
40 #include "utilities/defaultStream.hpp"
41 #include "utilities/macros.hpp"
42 #include "utilities/taskqueue.hpp"
43 #ifdef TARGET_OS_FAMILY_linux
44 # include "os_linux.inline.hpp"
45 #endif
46 #ifdef TARGET_OS_FAMILY_solaris
47 # include "os_solaris.inline.hpp"
48 #endif
49 #ifdef TARGET_OS_FAMILY_windows
50 # include "os_windows.inline.hpp"
51 #endif
52 #ifdef TARGET_OS_FAMILY_bsd
53 # include "os_bsd.inline.hpp"
54 #endif
55 #if INCLUDE_ALL_GCS
56 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
57 #endif // INCLUDE_ALL_GCS
58
59 // Note: This is a special bug reporting site for the JVM
60 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
61 #define DEFAULT_JAVA_LAUNCHER "generic"
62
63 char** Arguments::_jvm_flags_array = NULL;
64 int Arguments::_num_jvm_flags = 0;
65 char** Arguments::_jvm_args_array = NULL;
66 int Arguments::_num_jvm_args = 0;
67 char* Arguments::_java_command = NULL;
68 SystemProperty* Arguments::_system_properties = NULL;
69 const char* Arguments::_gc_log_filename = NULL;
70 bool Arguments::_has_profile = false;
71 uintx Arguments::_min_heap_size = 0;
72 Arguments::Mode Arguments::_mode = _mixed;
73 bool Arguments::_java_compiler = false;
74 bool Arguments::_xdebug_mode = false;
75 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
76 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
77 int Arguments::_sun_java_launcher_pid = -1;
78 bool Arguments::_created_by_gamma_launcher = false;
79
80 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
81 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
82 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
83 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
84 bool Arguments::_ClipInlining = ClipInlining;
85
86 char* Arguments::SharedArchivePath = NULL;
87
88 AgentLibraryList Arguments::_libraryList;
89 AgentLibraryList Arguments::_agentList;
90
91 abort_hook_t Arguments::_abort_hook = NULL;
92 exit_hook_t Arguments::_exit_hook = NULL;
93 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
94
95
96 SystemProperty *Arguments::_java_ext_dirs = NULL;
97 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
98 SystemProperty *Arguments::_sun_boot_library_path = NULL;
99 SystemProperty *Arguments::_java_library_path = NULL;
100 SystemProperty *Arguments::_java_home = NULL;
101 SystemProperty *Arguments::_java_class_path = NULL;
102 SystemProperty *Arguments::_sun_boot_class_path = NULL;
103
104 char* Arguments::_meta_index_path = NULL;
105 char* Arguments::_meta_index_dir = NULL;
106
107 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
108
109 static bool match_option(const JavaVMOption *option, const char* name,
110 const char** tail) {
111 int len = (int)strlen(name);
112 if (strncmp(option->optionString, name, len) == 0) {
113 *tail = option->optionString + len;
114 return true;
115 } else {
116 return false;
117 }
118 }
119
120 static void logOption(const char* opt) {
121 if (PrintVMOptions) {
122 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
123 }
124 }
125
126 // Process java launcher properties.
127 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
128 // See if sun.java.launcher or sun.java.launcher.pid is defined.
129 // Must do this before setting up other system properties,
130 // as some of them may depend on launcher type.
131 for (int index = 0; index < args->nOptions; index++) {
132 const JavaVMOption* option = args->options + index;
133 const char* tail;
134
135 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
136 process_java_launcher_argument(tail, option->extraInfo);
137 continue;
138 }
139 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
140 _sun_java_launcher_pid = atoi(tail);
141 continue;
142 }
143 }
144 }
145
146 // Initialize system properties key and value.
147 void Arguments::init_system_properties() {
148
149 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
150 "Java Virtual Machine Specification", false));
151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
154
155 // following are JVMTI agent writeable properties.
156 // Properties values are set to NULL and they are
157 // os specific they are initialized in os::init_system_properties_values().
158 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
159 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
160 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
161 _java_library_path = new SystemProperty("java.library.path", NULL, true);
162 _java_home = new SystemProperty("java.home", NULL, true);
163 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
164
165 _java_class_path = new SystemProperty("java.class.path", "", true);
166
167 // Add to System Property list.
168 PropertyList_add(&_system_properties, _java_ext_dirs);
169 PropertyList_add(&_system_properties, _java_endorsed_dirs);
170 PropertyList_add(&_system_properties, _sun_boot_library_path);
171 PropertyList_add(&_system_properties, _java_library_path);
172 PropertyList_add(&_system_properties, _java_home);
173 PropertyList_add(&_system_properties, _java_class_path);
174 PropertyList_add(&_system_properties, _sun_boot_class_path);
175
176 // Set OS specific system properties values
177 os::init_system_properties_values();
178 }
179
180
181 // Update/Initialize System properties after JDK version number is known
182 void Arguments::init_version_specific_system_properties() {
183 enum { bufsz = 16 };
184 char buffer[bufsz];
185 const char* spec_vendor = "Sun Microsystems Inc.";
186 uint32_t spec_version = 0;
187
188 if (JDK_Version::is_gte_jdk17x_version()) {
189 spec_vendor = "Oracle Corporation";
190 spec_version = JDK_Version::current().major_version();
191 }
192 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
193
194 PropertyList_add(&_system_properties,
195 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
196 PropertyList_add(&_system_properties,
197 new SystemProperty("java.vm.specification.version", buffer, false));
198 PropertyList_add(&_system_properties,
199 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
200 }
201
202 /**
203 * Provide a slightly more user-friendly way of eliminating -XX flags.
204 * When a flag is eliminated, it can be added to this list in order to
205 * continue accepting this flag on the command-line, while issuing a warning
206 * and ignoring the value. Once the JDK version reaches the 'accept_until'
207 * limit, we flatly refuse to admit the existence of the flag. This allows
208 * a flag to die correctly over JDK releases using HSX.
209 */
210 typedef struct {
211 const char* name;
212 JDK_Version obsoleted_in; // when the flag went away
213 JDK_Version accept_until; // which version to start denying the existence
214 } ObsoleteFlag;
215
216 static ObsoleteFlag obsolete_jvm_flags[] = {
217 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
218 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
229 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
230 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
231 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
232 { "DefaultInitialRAMFraction",
233 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
234 { "UseDepthFirstScavengeOrder",
235 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
236 { "HandlePromotionFailure",
237 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
238 { "MaxLiveObjectEvacuationRatio",
239 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
240 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
241 { "UseParallelOldGCCompacting",
242 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
243 { "UseParallelDensePrefixUpdate",
244 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
245 { "UseParallelOldGCDensePrefix",
246 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
247 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
248 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
249 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) },
250 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
251 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) },
252 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) },
253 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) },
254 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) },
255 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
256 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
257 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
258 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) },
259 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) },
260 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) },
261 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) },
262 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) },
263 #ifdef PRODUCT
264 { "DesiredMethodLimit",
265 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
266 #endif // PRODUCT
267 { NULL, JDK_Version(0), JDK_Version(0) }
268 };
269
270 // Returns true if the flag is obsolete and fits into the range specified
271 // for being ignored. In the case that the flag is ignored, the 'version'
272 // value is filled in with the version number when the flag became
273 // obsolete so that that value can be displayed to the user.
274 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
275 int i = 0;
276 assert(version != NULL, "Must provide a version buffer");
277 while (obsolete_jvm_flags[i].name != NULL) {
278 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
279 // <flag>=xxx form
280 // [-|+]<flag> form
281 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
282 ((s[0] == '+' || s[0] == '-') &&
283 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
284 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
285 *version = flag_status.obsoleted_in;
286 return true;
287 }
288 }
289 i++;
290 }
291 return false;
292 }
293
294 // Constructs the system class path (aka boot class path) from the following
295 // components, in order:
296 //
297 // prefix // from -Xbootclasspath/p:...
298 // endorsed // the expansion of -Djava.endorsed.dirs=...
299 // base // from os::get_system_properties() or -Xbootclasspath=
300 // suffix // from -Xbootclasspath/a:...
301 //
302 // java.endorsed.dirs is a list of directories; any jar or zip files in the
303 // directories are added to the sysclasspath just before the base.
304 //
305 // This could be AllStatic, but it isn't needed after argument processing is
306 // complete.
307 class SysClassPath: public StackObj {
308 public:
309 SysClassPath(const char* base);
310 ~SysClassPath();
311
312 inline void set_base(const char* base);
313 inline void add_prefix(const char* prefix);
314 inline void add_suffix_to_prefix(const char* suffix);
315 inline void add_suffix(const char* suffix);
316 inline void reset_path(const char* base);
317
318 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
319 // property. Must be called after all command-line arguments have been
320 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
321 // combined_path().
322 void expand_endorsed();
323
324 inline const char* get_base() const { return _items[_scp_base]; }
325 inline const char* get_prefix() const { return _items[_scp_prefix]; }
326 inline const char* get_suffix() const { return _items[_scp_suffix]; }
327 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
328
329 // Combine all the components into a single c-heap-allocated string; caller
330 // must free the string if/when no longer needed.
331 char* combined_path();
332
333 private:
334 // Utility routines.
335 static char* add_to_path(const char* path, const char* str, bool prepend);
336 static char* add_jars_to_path(char* path, const char* directory);
337
338 inline void reset_item_at(int index);
339
340 // Array indices for the items that make up the sysclasspath. All except the
341 // base are allocated in the C heap and freed by this class.
342 enum {
343 _scp_prefix, // from -Xbootclasspath/p:...
344 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
345 _scp_base, // the default sysclasspath
346 _scp_suffix, // from -Xbootclasspath/a:...
347 _scp_nitems // the number of items, must be last.
348 };
349
350 const char* _items[_scp_nitems];
351 DEBUG_ONLY(bool _expansion_done;)
352 };
353
354 SysClassPath::SysClassPath(const char* base) {
355 memset(_items, 0, sizeof(_items));
356 _items[_scp_base] = base;
357 DEBUG_ONLY(_expansion_done = false;)
358 }
359
360 SysClassPath::~SysClassPath() {
361 // Free everything except the base.
362 for (int i = 0; i < _scp_nitems; ++i) {
363 if (i != _scp_base) reset_item_at(i);
364 }
365 DEBUG_ONLY(_expansion_done = false;)
366 }
367
368 inline void SysClassPath::set_base(const char* base) {
369 _items[_scp_base] = base;
370 }
371
372 inline void SysClassPath::add_prefix(const char* prefix) {
373 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
374 }
375
376 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
377 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
378 }
379
380 inline void SysClassPath::add_suffix(const char* suffix) {
381 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
382 }
383
384 inline void SysClassPath::reset_item_at(int index) {
385 assert(index < _scp_nitems && index != _scp_base, "just checking");
386 if (_items[index] != NULL) {
387 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal);
388 _items[index] = NULL;
389 }
390 }
391
392 inline void SysClassPath::reset_path(const char* base) {
393 // Clear the prefix and suffix.
394 reset_item_at(_scp_prefix);
395 reset_item_at(_scp_suffix);
396 set_base(base);
397 }
398
399 //------------------------------------------------------------------------------
400
401 void SysClassPath::expand_endorsed() {
402 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
403
404 const char* path = Arguments::get_property("java.endorsed.dirs");
405 if (path == NULL) {
406 path = Arguments::get_endorsed_dir();
407 assert(path != NULL, "no default for java.endorsed.dirs");
408 }
409
410 char* expanded_path = NULL;
411 const char separator = *os::path_separator();
412 const char* const end = path + strlen(path);
413 while (path < end) {
414 const char* tmp_end = strchr(path, separator);
415 if (tmp_end == NULL) {
416 expanded_path = add_jars_to_path(expanded_path, path);
417 path = end;
418 } else {
419 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal);
420 memcpy(dirpath, path, tmp_end - path);
421 dirpath[tmp_end - path] = '\0';
422 expanded_path = add_jars_to_path(expanded_path, dirpath);
423 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal);
424 path = tmp_end + 1;
425 }
426 }
427 _items[_scp_endorsed] = expanded_path;
428 DEBUG_ONLY(_expansion_done = true;)
429 }
430
431 // Combine the bootclasspath elements, some of which may be null, into a single
432 // c-heap-allocated string.
433 char* SysClassPath::combined_path() {
434 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
435 assert(_expansion_done, "must call expand_endorsed() first.");
436
437 size_t lengths[_scp_nitems];
438 size_t total_len = 0;
439
440 const char separator = *os::path_separator();
441
442 // Get the lengths.
443 int i;
444 for (i = 0; i < _scp_nitems; ++i) {
445 if (_items[i] != NULL) {
446 lengths[i] = strlen(_items[i]);
447 // Include space for the separator char (or a NULL for the last item).
448 total_len += lengths[i] + 1;
449 }
450 }
451 assert(total_len > 0, "empty sysclasspath not allowed");
452
453 // Copy the _items to a single string.
454 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal);
455 char* cp_tmp = cp;
456 for (i = 0; i < _scp_nitems; ++i) {
457 if (_items[i] != NULL) {
458 memcpy(cp_tmp, _items[i], lengths[i]);
459 cp_tmp += lengths[i];
460 *cp_tmp++ = separator;
461 }
462 }
463 *--cp_tmp = '\0'; // Replace the extra separator.
464 return cp;
465 }
466
467 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
468 char*
469 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
470 char *cp;
471
472 assert(str != NULL, "just checking");
473 if (path == NULL) {
474 size_t len = strlen(str) + 1;
475 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
476 memcpy(cp, str, len); // copy the trailing null
477 } else {
478 const char separator = *os::path_separator();
479 size_t old_len = strlen(path);
480 size_t str_len = strlen(str);
481 size_t len = old_len + str_len + 2;
482
483 if (prepend) {
484 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal);
485 char* cp_tmp = cp;
486 memcpy(cp_tmp, str, str_len);
487 cp_tmp += str_len;
488 *cp_tmp = separator;
489 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
490 FREE_C_HEAP_ARRAY(char, path, mtInternal);
491 } else {
492 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal);
493 char* cp_tmp = cp + old_len;
494 *cp_tmp = separator;
495 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
496 }
497 }
498 return cp;
499 }
500
501 // Scan the directory and append any jar or zip files found to path.
502 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
503 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
504 DIR* dir = os::opendir(directory);
505 if (dir == NULL) return path;
506
507 char dir_sep[2] = { '\0', '\0' };
508 size_t directory_len = strlen(directory);
509 const char fileSep = *os::file_separator();
510 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
511
512 /* Scan the directory for jars/zips, appending them to path. */
513 struct dirent *entry;
514 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal);
515 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
516 const char* name = entry->d_name;
517 const char* ext = name + strlen(name) - 4;
518 bool isJarOrZip = ext > name &&
519 (os::file_name_strcmp(ext, ".jar") == 0 ||
520 os::file_name_strcmp(ext, ".zip") == 0);
521 if (isJarOrZip) {
522 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal);
523 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
524 path = add_to_path(path, jarpath, false);
525 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal);
526 }
527 }
528 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal);
529 os::closedir(dir);
530 return path;
531 }
532
533 // Parses a memory size specification string.
534 static bool atomull(const char *s, julong* result) {
535 julong n = 0;
536 int args_read = sscanf(s, JULONG_FORMAT, &n);
537 if (args_read != 1) {
538 return false;
539 }
540 while (*s != '\0' && isdigit(*s)) {
541 s++;
542 }
543 // 4705540: illegal if more characters are found after the first non-digit
544 if (strlen(s) > 1) {
545 return false;
546 }
547 switch (*s) {
548 case 'T': case 't':
549 *result = n * G * K;
550 // Check for overflow.
551 if (*result/((julong)G * K) != n) return false;
552 return true;
553 case 'G': case 'g':
554 *result = n * G;
555 if (*result/G != n) return false;
556 return true;
557 case 'M': case 'm':
558 *result = n * M;
559 if (*result/M != n) return false;
560 return true;
561 case 'K': case 'k':
562 *result = n * K;
563 if (*result/K != n) return false;
564 return true;
565 case '\0':
566 *result = n;
567 return true;
568 default:
569 return false;
570 }
571 }
572
573 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
574 if (size < min_size) return arg_too_small;
575 // Check that size will fit in a size_t (only relevant on 32-bit)
576 if (size > max_uintx) return arg_too_big;
577 return arg_in_range;
578 }
579
580 // Describe an argument out of range error
581 void Arguments::describe_range_error(ArgsRange errcode) {
582 switch(errcode) {
583 case arg_too_big:
584 jio_fprintf(defaultStream::error_stream(),
585 "The specified size exceeds the maximum "
586 "representable size.\n");
587 break;
588 case arg_too_small:
589 case arg_unreadable:
590 case arg_in_range:
591 // do nothing for now
592 break;
593 default:
594 ShouldNotReachHere();
595 }
596 }
597
598 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
599 return CommandLineFlags::boolAtPut(name, &value, origin);
600 }
601
602 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
603 double v;
604 if (sscanf(value, "%lf", &v) != 1) {
605 return false;
606 }
607
608 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
609 return true;
610 }
611 return false;
612 }
613
614 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
615 julong v;
616 intx intx_v;
617 bool is_neg = false;
618 // Check the sign first since atomull() parses only unsigned values.
619 if (*value == '-') {
620 if (!CommandLineFlags::intxAt(name, &intx_v)) {
621 return false;
622 }
623 value++;
624 is_neg = true;
625 }
626 if (!atomull(value, &v)) {
627 return false;
628 }
629 intx_v = (intx) v;
630 if (is_neg) {
631 intx_v = -intx_v;
632 }
633 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
634 return true;
635 }
636 uintx uintx_v = (uintx) v;
637 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
638 return true;
639 }
640 uint64_t uint64_t_v = (uint64_t) v;
641 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
642 return true;
643 }
644 return false;
645 }
646
647 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
648 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
649 // Contract: CommandLineFlags always returns a pointer that needs freeing.
650 FREE_C_HEAP_ARRAY(char, value, mtInternal);
651 return true;
652 }
653
654 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
655 const char* old_value = "";
656 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
657 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
658 size_t new_len = strlen(new_value);
659 const char* value;
660 char* free_this_too = NULL;
661 if (old_len == 0) {
662 value = new_value;
663 } else if (new_len == 0) {
664 value = old_value;
665 } else {
666 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal);
667 // each new setting adds another LINE to the switch:
668 sprintf(buf, "%s\n%s", old_value, new_value);
669 value = buf;
670 free_this_too = buf;
671 }
672 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
673 // CommandLineFlags always returns a pointer that needs freeing.
674 FREE_C_HEAP_ARRAY(char, value, mtInternal);
675 if (free_this_too != NULL) {
676 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
677 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal);
678 }
679 return true;
680 }
681
682 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
683
684 // range of acceptable characters spelled out for portability reasons
685 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
686 #define BUFLEN 255
687 char name[BUFLEN+1];
688 char dummy;
689
690 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
691 return set_bool_flag(name, false, origin);
692 }
693 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
694 return set_bool_flag(name, true, origin);
695 }
696
697 char punct;
698 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
699 const char* value = strchr(arg, '=') + 1;
700 Flag* flag = Flag::find_flag(name, strlen(name));
701 if (flag != NULL && flag->is_ccstr()) {
702 if (flag->ccstr_accumulates()) {
703 return append_to_string_flag(name, value, origin);
704 } else {
705 if (value[0] == '\0') {
706 value = NULL;
707 }
708 return set_string_flag(name, value, origin);
709 }
710 }
711 }
712
713 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
714 const char* value = strchr(arg, '=') + 1;
715 // -XX:Foo:=xxx will reset the string flag to the given value.
716 if (value[0] == '\0') {
717 value = NULL;
718 }
719 return set_string_flag(name, value, origin);
720 }
721
722 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
723 #define SIGNED_NUMBER_RANGE "[-0123456789]"
724 #define NUMBER_RANGE "[0123456789]"
725 char value[BUFLEN + 1];
726 char value2[BUFLEN + 1];
727 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
728 // Looks like a floating-point number -- try again with more lenient format string
729 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
730 return set_fp_numeric_flag(name, value, origin);
731 }
732 }
733
734 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
735 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
736 return set_numeric_flag(name, value, origin);
737 }
738
739 return false;
740 }
741
742 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
743 assert(bldarray != NULL, "illegal argument");
744
745 if (arg == NULL) {
746 return;
747 }
748
749 int new_count = *count + 1;
750
751 // expand the array and add arg to the last element
752 if (*bldarray == NULL) {
753 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal);
754 } else {
755 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal);
756 }
757 (*bldarray)[*count] = strdup(arg);
758 *count = new_count;
759 }
760
761 void Arguments::build_jvm_args(const char* arg) {
762 add_string(&_jvm_args_array, &_num_jvm_args, arg);
763 }
764
765 void Arguments::build_jvm_flags(const char* arg) {
766 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
767 }
768
769 // utility function to return a string that concatenates all
770 // strings in a given char** array
771 const char* Arguments::build_resource_string(char** args, int count) {
772 if (args == NULL || count == 0) {
773 return NULL;
774 }
775 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
776 for (int i = 1; i < count; i++) {
777 length += strlen(args[i]) + 1; // add 1 for a space
778 }
779 char* s = NEW_RESOURCE_ARRAY(char, length);
780 strcpy(s, args[0]);
781 for (int j = 1; j < count; j++) {
782 strcat(s, " ");
783 strcat(s, args[j]);
784 }
785 return (const char*) s;
786 }
787
788 void Arguments::print_on(outputStream* st) {
789 st->print_cr("VM Arguments:");
790 if (num_jvm_flags() > 0) {
791 st->print("jvm_flags: "); print_jvm_flags_on(st);
792 }
793 if (num_jvm_args() > 0) {
794 st->print("jvm_args: "); print_jvm_args_on(st);
795 }
796 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
797 if (_java_class_path != NULL) {
798 char* path = _java_class_path->value();
799 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path );
800 }
801 st->print_cr("Launcher Type: %s", _sun_java_launcher);
802 }
803
804 void Arguments::print_jvm_flags_on(outputStream* st) {
805 if (_num_jvm_flags > 0) {
806 for (int i=0; i < _num_jvm_flags; i++) {
807 st->print("%s ", _jvm_flags_array[i]);
808 }
809 st->print_cr("");
810 }
811 }
812
813 void Arguments::print_jvm_args_on(outputStream* st) {
814 if (_num_jvm_args > 0) {
815 for (int i=0; i < _num_jvm_args; i++) {
816 st->print("%s ", _jvm_args_array[i]);
817 }
818 st->print_cr("");
819 }
820 }
821
822 bool Arguments::process_argument(const char* arg,
823 jboolean ignore_unrecognized, FlagValueOrigin origin) {
824
825 JDK_Version since = JDK_Version();
826
827 if (parse_argument(arg, origin) || ignore_unrecognized) {
828 return true;
829 }
830
831 bool has_plus_minus = (*arg == '+' || *arg == '-');
832 const char* const argname = has_plus_minus ? arg + 1 : arg;
833 if (is_newly_obsolete(arg, &since)) {
834 char version[256];
835 since.to_string(version, sizeof(version));
836 warning("ignoring option %s; support was removed in %s", argname, version);
837 return true;
838 }
839
840 // For locked flags, report a custom error message if available.
841 // Otherwise, report the standard unrecognized VM option.
842
843 size_t arg_len;
844 const char* equal_sign = strchr(argname, '=');
845 if (equal_sign == NULL) {
846 arg_len = strlen(argname);
847 } else {
848 arg_len = equal_sign - argname;
849 }
850
851 Flag* found_flag = Flag::find_flag((char*)argname, arg_len, true);
852 if (found_flag != NULL) {
853 char locked_message_buf[BUFLEN];
854 found_flag->get_locked_message(locked_message_buf, BUFLEN);
855 if (strlen(locked_message_buf) == 0) {
856 if (found_flag->is_bool() && !has_plus_minus) {
857 jio_fprintf(defaultStream::error_stream(),
858 "Missing +/- setting for VM option '%s'\n", argname);
859 } else if (!found_flag->is_bool() && has_plus_minus) {
860 jio_fprintf(defaultStream::error_stream(),
861 "Unexpected +/- setting in VM option '%s'\n", argname);
862 } else {
863 jio_fprintf(defaultStream::error_stream(),
864 "Improperly specified VM option '%s'\n", argname);
865 }
866 } else {
867 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
868 }
869 } else {
870 jio_fprintf(defaultStream::error_stream(),
871 "Unrecognized VM option '%s'\n", argname);
872 }
873
874 // allow for commandline "commenting out" options like -XX:#+Verbose
875 return arg[0] == '#';
876 }
877
878 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
879 FILE* stream = fopen(file_name, "rb");
880 if (stream == NULL) {
881 if (should_exist) {
882 jio_fprintf(defaultStream::error_stream(),
883 "Could not open settings file %s\n", file_name);
884 return false;
885 } else {
886 return true;
887 }
888 }
889
890 char token[1024];
891 int pos = 0;
892
893 bool in_white_space = true;
894 bool in_comment = false;
895 bool in_quote = false;
896 char quote_c = 0;
897 bool result = true;
898
899 int c = getc(stream);
900 while(c != EOF && pos < (int)(sizeof(token)-1)) {
901 if (in_white_space) {
902 if (in_comment) {
903 if (c == '\n') in_comment = false;
904 } else {
905 if (c == '#') in_comment = true;
906 else if (!isspace(c)) {
907 in_white_space = false;
908 token[pos++] = c;
909 }
910 }
911 } else {
912 if (c == '\n' || (!in_quote && isspace(c))) {
913 // token ends at newline, or at unquoted whitespace
914 // this allows a way to include spaces in string-valued options
915 token[pos] = '\0';
916 logOption(token);
917 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
918 build_jvm_flags(token);
919 pos = 0;
920 in_white_space = true;
921 in_quote = false;
922 } else if (!in_quote && (c == '\'' || c == '"')) {
923 in_quote = true;
924 quote_c = c;
925 } else if (in_quote && (c == quote_c)) {
926 in_quote = false;
927 } else {
928 token[pos++] = c;
929 }
930 }
931 c = getc(stream);
932 }
933 if (pos > 0) {
934 token[pos] = '\0';
935 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
936 build_jvm_flags(token);
937 }
938 fclose(stream);
939 return result;
940 }
941
942 //=============================================================================================================
943 // Parsing of properties (-D)
944
945 const char* Arguments::get_property(const char* key) {
946 return PropertyList_get_value(system_properties(), key);
947 }
948
949 bool Arguments::add_property(const char* prop) {
950 const char* eq = strchr(prop, '=');
951 char* key;
952 // ns must be static--its address may be stored in a SystemProperty object.
953 const static char ns[1] = {0};
954 char* value = (char *)ns;
955
956 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
957 key = AllocateHeap(key_len + 1, mtInternal);
958 strncpy(key, prop, key_len);
959 key[key_len] = '\0';
960
961 if (eq != NULL) {
962 size_t value_len = strlen(prop) - key_len - 1;
963 value = AllocateHeap(value_len + 1, mtInternal);
964 strncpy(value, &prop[key_len + 1], value_len + 1);
965 }
966
967 if (strcmp(key, "java.compiler") == 0) {
968 process_java_compiler_argument(value);
969 FreeHeap(key);
970 if (eq != NULL) {
971 FreeHeap(value);
972 }
973 return true;
974 } else if (strcmp(key, "sun.java.command") == 0) {
975 _java_command = value;
976
977 // Record value in Arguments, but let it get passed to Java.
978 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
979 // launcher.pid property is private and is processed
980 // in process_sun_java_launcher_properties();
981 // the sun.java.launcher property is passed on to the java application
982 FreeHeap(key);
983 if (eq != NULL) {
984 FreeHeap(value);
985 }
986 return true;
987 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
988 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
989 // its value without going through the property list or making a Java call.
990 _java_vendor_url_bug = value;
991 } else if (strcmp(key, "sun.boot.library.path") == 0) {
992 PropertyList_unique_add(&_system_properties, key, value, true);
993 return true;
994 }
995 // Create new property and add at the end of the list
996 PropertyList_unique_add(&_system_properties, key, value);
997 return true;
998 }
999
1000 //===========================================================================================================
1001 // Setting int/mixed/comp mode flags
1002
1003 void Arguments::set_mode_flags(Mode mode) {
1004 // Set up default values for all flags.
1005 // If you add a flag to any of the branches below,
1006 // add a default value for it here.
1007 set_java_compiler(false);
1008 _mode = mode;
1009
1010 // Ensure Agent_OnLoad has the correct initial values.
1011 // This may not be the final mode; mode may change later in onload phase.
1012 PropertyList_unique_add(&_system_properties, "java.vm.info",
1013 (char*)VM_Version::vm_info_string(), false);
1014
1015 UseInterpreter = true;
1016 UseCompiler = true;
1017 UseLoopCounter = true;
1018
1019 #ifndef ZERO
1020 // Turn these off for mixed and comp. Leave them on for Zero.
1021 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
1022 UseFastAccessorMethods = (mode == _int);
1023 }
1024 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
1025 UseFastEmptyMethods = (mode == _int);
1026 }
1027 #endif
1028
1029 // Default values may be platform/compiler dependent -
1030 // use the saved values
1031 ClipInlining = Arguments::_ClipInlining;
1032 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
1033 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
1034 BackgroundCompilation = Arguments::_BackgroundCompilation;
1035
1036 // Change from defaults based on mode
1037 switch (mode) {
1038 default:
1039 ShouldNotReachHere();
1040 break;
1041 case _int:
1042 UseCompiler = false;
1043 UseLoopCounter = false;
1044 AlwaysCompileLoopMethods = false;
1045 UseOnStackReplacement = false;
1046 break;
1047 case _mixed:
1048 // same as default
1049 break;
1050 case _comp:
1051 UseInterpreter = false;
1052 BackgroundCompilation = false;
1053 ClipInlining = false;
1054 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1055 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1056 // compile a level 4 (C2) and then continue executing it.
1057 if (TieredCompilation) {
1058 Tier3InvokeNotifyFreqLog = 0;
1059 Tier4InvocationThreshold = 0;
1060 }
1061 break;
1062 }
1063 }
1064
1065 // Conflict: required to use shared spaces (-Xshare:on), but
1066 // incompatible command line options were chosen.
1067
1068 static void no_shared_spaces() {
1069 if (RequireSharedSpaces) {
1070 jio_fprintf(defaultStream::error_stream(),
1071 "Class data sharing is inconsistent with other specified options.\n");
1072 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1073 } else {
1074 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1075 }
1076 }
1077
1078 void Arguments::set_tiered_flags() {
1079 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1080 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1081 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1082 }
1083 if (CompilationPolicyChoice < 2) {
1084 vm_exit_during_initialization(
1085 "Incompatible compilation policy selected", NULL);
1086 }
1087 // Increase the code cache size - tiered compiles a lot more.
1088 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1089 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5);
1090 }
1091 if (!UseInterpreter) { // -Xcomp
1092 Tier3InvokeNotifyFreqLog = 0;
1093 Tier4InvocationThreshold = 0;
1094 }
1095 }
1096
1097 #if INCLUDE_ALL_GCS
1098 static void disable_adaptive_size_policy(const char* collector_name) {
1099 if (UseAdaptiveSizePolicy) {
1100 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1101 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1102 collector_name);
1103 }
1104 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1105 }
1106 }
1107
1108 void Arguments::set_parnew_gc_flags() {
1109 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1110 "control point invariant");
1111 assert(UseParNewGC, "Error");
1112
1113 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1114 disable_adaptive_size_policy("UseParNewGC");
1115
1116 if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
1117 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads());
1118 assert(ParallelGCThreads > 0, "We should always have at least one thread by default");
1119 } else if (ParallelGCThreads == 0) {
1120 jio_fprintf(defaultStream::error_stream(),
1121 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n");
1122 vm_exit(1);
1123 }
1124
1125 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1126 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1127 // we set them to 1024 and 1024.
1128 // See CR 6362902.
1129 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1130 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1131 }
1132 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1133 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1134 }
1135
1136 // AlwaysTenure flag should make ParNew promote all at first collection.
1137 // See CR 6362902.
1138 if (AlwaysTenure) {
1139 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0);
1140 }
1141 // When using compressed oops, we use local overflow stacks,
1142 // rather than using a global overflow list chained through
1143 // the klass word of the object's pre-image.
1144 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1145 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1146 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1147 }
1148 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1149 }
1150 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1151 }
1152
1153 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1154 // sparc/solaris for certain applications, but would gain from
1155 // further optimization and tuning efforts, and would almost
1156 // certainly gain from analysis of platform and environment.
1157 void Arguments::set_cms_and_parnew_gc_flags() {
1158 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1159 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1160
1161 // If we are using CMS, we prefer to UseParNewGC,
1162 // unless explicitly forbidden.
1163 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1164 FLAG_SET_ERGO(bool, UseParNewGC, true);
1165 }
1166
1167 // Turn off AdaptiveSizePolicy by default for cms until it is complete.
1168 disable_adaptive_size_policy("UseConcMarkSweepGC");
1169
1170 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1171 // as needed.
1172 if (UseParNewGC) {
1173 set_parnew_gc_flags();
1174 }
1175
1176 size_t max_heap = align_size_down(MaxHeapSize,
1177 CardTableRS::ct_max_alignment_constraint());
1178
1179 // Now make adjustments for CMS
1180 intx tenuring_default = (intx)6;
1181 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1182
1183 // Preferred young gen size for "short" pauses:
1184 // upper bound depends on # of threads and NewRatio.
1185 const uintx parallel_gc_threads =
1186 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1187 const size_t preferred_max_new_size_unaligned =
1188 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1189 size_t preferred_max_new_size =
1190 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1191
1192 // Unless explicitly requested otherwise, size young gen
1193 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1194
1195 // If either MaxNewSize or NewRatio is set on the command line,
1196 // assume the user is trying to set the size of the young gen.
1197 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1198
1199 // Set MaxNewSize to our calculated preferred_max_new_size unless
1200 // NewSize was set on the command line and it is larger than
1201 // preferred_max_new_size.
1202 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1203 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1204 } else {
1205 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1206 }
1207 if (PrintGCDetails && Verbose) {
1208 // Too early to use gclog_or_tty
1209 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1210 }
1211
1212 // Code along this path potentially sets NewSize and OldSize
1213 if (PrintGCDetails && Verbose) {
1214 // Too early to use gclog_or_tty
1215 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1216 " initial_heap_size: " SIZE_FORMAT
1217 " max_heap: " SIZE_FORMAT,
1218 min_heap_size(), InitialHeapSize, max_heap);
1219 }
1220 size_t min_new = preferred_max_new_size;
1221 if (FLAG_IS_CMDLINE(NewSize)) {
1222 min_new = NewSize;
1223 }
1224 if (max_heap > min_new && min_heap_size() > min_new) {
1225 // Unless explicitly requested otherwise, make young gen
1226 // at least min_new, and at most preferred_max_new_size.
1227 if (FLAG_IS_DEFAULT(NewSize)) {
1228 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1229 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1230 if (PrintGCDetails && Verbose) {
1231 // Too early to use gclog_or_tty
1232 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1233 }
1234 }
1235 // Unless explicitly requested otherwise, size old gen
1236 // so it's NewRatio x of NewSize.
1237 if (FLAG_IS_DEFAULT(OldSize)) {
1238 if (max_heap > NewSize) {
1239 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1240 if (PrintGCDetails && Verbose) {
1241 // Too early to use gclog_or_tty
1242 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1243 }
1244 }
1245 }
1246 }
1247 }
1248 // Unless explicitly requested otherwise, definitely
1249 // promote all objects surviving "tenuring_default" scavenges.
1250 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1251 FLAG_IS_DEFAULT(SurvivorRatio)) {
1252 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default);
1253 }
1254 // If we decided above (or user explicitly requested)
1255 // `promote all' (via MaxTenuringThreshold := 0),
1256 // prefer minuscule survivor spaces so as not to waste
1257 // space for (non-existent) survivors
1258 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1259 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio));
1260 }
1261 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1262 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1263 // This is done in order to make ParNew+CMS configuration to work
1264 // with YoungPLABSize and OldPLABSize options.
1265 // See CR 6362902.
1266 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1267 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1268 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1269 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1270 // the value (either from the command line or ergonomics) of
1271 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1272 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1273 } else {
1274 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1275 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1276 // we'll let it to take precedence.
1277 jio_fprintf(defaultStream::error_stream(),
1278 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1279 " options are specified for the CMS collector."
1280 " CMSParPromoteBlocksToClaim will take precedence.\n");
1281 }
1282 }
1283 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1284 // OldPLAB sizing manually turned off: Use a larger default setting,
1285 // unless it was manually specified. This is because a too-low value
1286 // will slow down scavenges.
1287 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1288 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1289 }
1290 }
1291 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1292 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1293 // If either of the static initialization defaults have changed, note this
1294 // modification.
1295 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1296 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1297 }
1298 if (PrintGCDetails && Verbose) {
1299 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1300 MarkStackSize / K, MarkStackSizeMax / K);
1301 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1302 }
1303 }
1304 #endif // INCLUDE_ALL_GCS
1305
1306 void set_object_alignment() {
1307 // Object alignment.
1308 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1309 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1310 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1311 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1312 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1313 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1314
1315 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1316 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1317
1318 // Oop encoding heap max
1319 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1320
1321 #if INCLUDE_ALL_GCS
1322 // Set CMS global values
1323 CompactibleFreeListSpace::set_cms_values();
1324 #endif // INCLUDE_ALL_GCS
1325 }
1326
1327 bool verify_object_alignment() {
1328 // Object alignment.
1329 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1330 jio_fprintf(defaultStream::error_stream(),
1331 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1332 (int)ObjectAlignmentInBytes);
1333 return false;
1334 }
1335 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1336 jio_fprintf(defaultStream::error_stream(),
1337 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1338 (int)ObjectAlignmentInBytes, BytesPerLong);
1339 return false;
1340 }
1341 // It does not make sense to have big object alignment
1342 // since a space lost due to alignment will be greater
1343 // then a saved space from compressed oops.
1344 if ((int)ObjectAlignmentInBytes > 256) {
1345 jio_fprintf(defaultStream::error_stream(),
1346 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n",
1347 (int)ObjectAlignmentInBytes);
1348 return false;
1349 }
1350 // In case page size is very small.
1351 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1352 jio_fprintf(defaultStream::error_stream(),
1353 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n",
1354 (int)ObjectAlignmentInBytes, os::vm_page_size());
1355 return false;
1356 }
1357 return true;
1358 }
1359
1360 inline uintx max_heap_for_compressed_oops() {
1361 // Avoid sign flip.
1362 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) {
1363 return 0;
1364 }
1365 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size());
1366 NOT_LP64(ShouldNotReachHere(); return 0);
1367 }
1368
1369 bool Arguments::should_auto_select_low_pause_collector() {
1370 if (UseAutoGCSelectPolicy &&
1371 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1372 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1373 if (PrintGCDetails) {
1374 // Cannot use gclog_or_tty yet.
1375 tty->print_cr("Automatic selection of the low pause collector"
1376 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1377 }
1378 return true;
1379 }
1380 return false;
1381 }
1382
1383 void Arguments::set_use_compressed_oops() {
1384 #ifndef ZERO
1385 #ifdef _LP64
1386 // MaxHeapSize is not set up properly at this point, but
1387 // the only value that can override MaxHeapSize if we are
1388 // to use UseCompressedOops is InitialHeapSize.
1389 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize);
1390
1391 if (max_heap_size <= max_heap_for_compressed_oops()) {
1392 #if !defined(COMPILER1) || defined(TIERED)
1393 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1394 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1395 }
1396 #endif
1397 #ifdef _WIN64
1398 if (UseLargePages && UseCompressedOops) {
1399 // Cannot allocate guard pages for implicit checks in indexed addressing
1400 // mode, when large pages are specified on windows.
1401 // This flag could be switched ON if narrow oop base address is set to 0,
1402 // see code in Universe::initialize_heap().
1403 Universe::set_narrow_oop_use_implicit_null_checks(false);
1404 }
1405 #endif // _WIN64
1406 } else {
1407 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1408 warning("Max heap size too large for Compressed Oops");
1409 FLAG_SET_DEFAULT(UseCompressedOops, false);
1410 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1411 }
1412 }
1413 #endif // _LP64
1414 #endif // ZERO
1415 }
1416
1417 void Arguments::set_ergonomics_flags() {
1418
1419 if (os::is_server_class_machine()) {
1420 // If no other collector is requested explicitly,
1421 // let the VM select the collector based on
1422 // machine class and automatic selection policy.
1423 if (!UseSerialGC &&
1424 !UseConcMarkSweepGC &&
1425 !UseG1GC &&
1426 !UseParNewGC &&
1427 FLAG_IS_DEFAULT(UseParallelGC)) {
1428 if (should_auto_select_low_pause_collector()) {
1429 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1430 } else {
1431 FLAG_SET_ERGO(bool, UseParallelGC, true);
1432 }
1433 }
1434 // Shared spaces work fine with other GCs but causes bytecode rewriting
1435 // to be disabled, which hurts interpreter performance and decreases
1436 // server performance. On server class machines, keep the default
1437 // off unless it is asked for. Future work: either add bytecode rewriting
1438 // at link time, or rewrite bytecodes in non-shared methods.
1439 if (!DumpSharedSpaces && !RequireSharedSpaces) {
1440 no_shared_spaces();
1441 }
1442 }
1443
1444 #ifndef ZERO
1445 #ifdef _LP64
1446 set_use_compressed_oops();
1447 // UseCompressedOops must be on for UseCompressedKlassPointers to be on.
1448 if (!UseCompressedOops) {
1449 if (UseCompressedKlassPointers) {
1450 warning("UseCompressedKlassPointers requires UseCompressedOops");
1451 }
1452 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1453 } else {
1454 // Turn on UseCompressedKlassPointers too
1455 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) {
1456 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true);
1457 }
1458 // Set the ClassMetaspaceSize to something that will not need to be
1459 // expanded, since it cannot be expanded.
1460 if (UseCompressedKlassPointers) {
1461 if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) {
1462 warning("Class metaspace size is too large for UseCompressedKlassPointers");
1463 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false);
1464 } else if (FLAG_IS_DEFAULT(ClassMetaspaceSize)) {
1465 // 100,000 classes seems like a good size, so 100M assumes around 1K
1466 // per klass. The vtable and oopMap is embedded so we don't have a fixed
1467 // size per klass. Eventually, this will be parameterized because it
1468 // would also be useful to determine the optimal size of the
1469 // systemDictionary.
1470 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M);
1471 }
1472 }
1473 }
1474 // Also checks that certain machines are slower with compressed oops
1475 // in vm_version initialization code.
1476 #endif // _LP64
1477 #endif // !ZERO
1478 }
1479
1480 void Arguments::set_parallel_gc_flags() {
1481 assert(UseParallelGC || UseParallelOldGC, "Error");
1482 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1483 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1484 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1485 }
1486 FLAG_SET_DEFAULT(UseParallelGC, true);
1487
1488 // If no heap maximum was requested explicitly, use some reasonable fraction
1489 // of the physical memory, up to a maximum of 1GB.
1490 FLAG_SET_DEFAULT(ParallelGCThreads,
1491 Abstract_VM_Version::parallel_worker_threads());
1492 if (ParallelGCThreads == 0) {
1493 jio_fprintf(defaultStream::error_stream(),
1494 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
1495 vm_exit(1);
1496 }
1497
1498
1499 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1500 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1501 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1502 // See CR 6362902 for details.
1503 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1504 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1505 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1506 }
1507 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1508 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1509 }
1510 }
1511
1512 if (UseParallelOldGC) {
1513 // Par compact uses lower default values since they are treated as
1514 // minimums. These are different defaults because of the different
1515 // interpretation and are not ergonomically set.
1516 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1517 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1518 }
1519 }
1520 }
1521
1522 void Arguments::set_g1_gc_flags() {
1523 assert(UseG1GC, "Error");
1524 #ifdef COMPILER1
1525 FastTLABRefill = false;
1526 #endif
1527 FLAG_SET_DEFAULT(ParallelGCThreads,
1528 Abstract_VM_Version::parallel_worker_threads());
1529 if (ParallelGCThreads == 0) {
1530 FLAG_SET_DEFAULT(ParallelGCThreads,
1531 Abstract_VM_Version::parallel_worker_threads());
1532 }
1533
1534 // MarkStackSize will be set (if it hasn't been set by the user)
1535 // when concurrent marking is initialized.
1536 // Its value will be based upon the number of parallel marking threads.
1537 // But we do set the maximum mark stack size here.
1538 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
1539 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE);
1540 }
1541
1542 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1543 // In G1, we want the default GC overhead goal to be higher than
1544 // say in PS. So we set it here to 10%. Otherwise the heap might
1545 // be expanded more aggressively than we would like it to. In
1546 // fact, even 10% seems to not be high enough in some cases
1547 // (especially small GC stress tests that the main thing they do
1548 // is allocation). We might consider increase it further.
1549 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1550 }
1551
1552 if (PrintGCDetails && Verbose) {
1553 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1554 MarkStackSize / K, MarkStackSizeMax / K);
1555 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1556 }
1557 }
1558
1559 julong Arguments::limit_by_allocatable_memory(julong limit) {
1560 julong max_allocatable;
1561 julong result = limit;
1562 if (os::has_allocatable_memory_limit(&max_allocatable)) {
1563 result = MIN2(result, max_allocatable / MaxVirtMemFraction);
1564 }
1565 return result;
1566 }
1567
1568 void Arguments::set_heap_size() {
1569 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1570 // Deprecated flag
1571 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1572 }
1573
1574 const julong phys_mem =
1575 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1576 : (julong)MaxRAM;
1577
1578 // If the maximum heap size has not been set with -Xmx,
1579 // then set it as fraction of the size of physical memory,
1580 // respecting the maximum and minimum sizes of the heap.
1581 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1582 julong reasonable_max = phys_mem / MaxRAMFraction;
1583
1584 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1585 // Small physical memory, so use a minimum fraction of it for the heap
1586 reasonable_max = phys_mem / MinRAMFraction;
1587 } else {
1588 // Not-small physical memory, so require a heap at least
1589 // as large as MaxHeapSize
1590 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1591 }
1592 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1593 // Limit the heap size to ErgoHeapSizeLimit
1594 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1595 }
1596 if (UseCompressedOops) {
1597 // Limit the heap size to the maximum possible when using compressed oops
1598 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1599 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1600 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1601 // but it should be not less than default MaxHeapSize.
1602 max_coop_heap -= HeapBaseMinAddress;
1603 }
1604 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1605 }
1606 reasonable_max = limit_by_allocatable_memory(reasonable_max);
1607
1608 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1609 // An initial heap size was specified on the command line,
1610 // so be sure that the maximum size is consistent. Done
1611 // after call to limit_by_allocatable_memory because that
1612 // method might reduce the allocation size.
1613 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1614 }
1615
1616 if (PrintGCDetails && Verbose) {
1617 // Cannot use gclog_or_tty yet.
1618 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1619 }
1620 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1621 }
1622
1623 // If the minimum or initial heap_size have not been set or requested to be set
1624 // ergonomically, set them accordingly.
1625 if (InitialHeapSize == 0 || min_heap_size() == 0) {
1626 julong reasonable_minimum = (julong)(OldSize + NewSize);
1627
1628 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1629
1630 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum);
1631
1632 if (InitialHeapSize == 0) {
1633 julong reasonable_initial = phys_mem / InitialRAMFraction;
1634
1635 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size());
1636 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1637
1638 reasonable_initial = limit_by_allocatable_memory(reasonable_initial);
1639
1640 if (PrintGCDetails && Verbose) {
1641 // Cannot use gclog_or_tty yet.
1642 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1643 }
1644 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1645 }
1646 // If the minimum heap size has not been set (via -Xms),
1647 // synchronize with InitialHeapSize to avoid errors with the default value.
1648 if (min_heap_size() == 0) {
1649 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize));
1650 if (PrintGCDetails && Verbose) {
1651 // Cannot use gclog_or_tty yet.
1652 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size());
1653 }
1654 }
1655 }
1656 }
1657
1658 // This must be called after ergonomics because we want bytecode rewriting
1659 // if the server compiler is used, or if UseSharedSpaces is disabled.
1660 void Arguments::set_bytecode_flags() {
1661 // Better not attempt to store into a read-only space.
1662 if (UseSharedSpaces) {
1663 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1664 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1665 }
1666
1667 if (!RewriteBytecodes) {
1668 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1669 }
1670 }
1671
1672 // Aggressive optimization flags -XX:+AggressiveOpts
1673 void Arguments::set_aggressive_opts_flags() {
1674 #ifdef COMPILER2
1675 if (AggressiveUnboxing) {
1676 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1677 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1678 } else if (!EliminateAutoBox) {
1679 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled");
1680 AggressiveUnboxing = false;
1681 }
1682 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1683 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1684 } else if (!DoEscapeAnalysis) {
1685 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled");
1686 AggressiveUnboxing = false;
1687 }
1688 }
1689 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1690 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1691 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1692 }
1693 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1694 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1695 }
1696
1697 // Feed the cache size setting into the JDK
1698 char buffer[1024];
1699 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1700 add_property(buffer);
1701 }
1702 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1703 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1704 }
1705 #endif
1706
1707 if (AggressiveOpts) {
1708 // Sample flag setting code
1709 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1710 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1711 // }
1712 }
1713 }
1714
1715 //===========================================================================================================
1716 // Parsing of java.compiler property
1717
1718 void Arguments::process_java_compiler_argument(char* arg) {
1719 // For backwards compatibility, Djava.compiler=NONE or ""
1720 // causes us to switch to -Xint mode UNLESS -Xdebug
1721 // is also specified.
1722 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1723 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1724 }
1725 }
1726
1727 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1728 _sun_java_launcher = strdup(launcher);
1729 if (strcmp("gamma", _sun_java_launcher) == 0) {
1730 _created_by_gamma_launcher = true;
1731 }
1732 }
1733
1734 bool Arguments::created_by_java_launcher() {
1735 assert(_sun_java_launcher != NULL, "property must have value");
1736 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1737 }
1738
1739 bool Arguments::created_by_gamma_launcher() {
1740 return _created_by_gamma_launcher;
1741 }
1742
1743 //===========================================================================================================
1744 // Parsing of main arguments
1745
1746 bool Arguments::verify_interval(uintx val, uintx min,
1747 uintx max, const char* name) {
1748 // Returns true iff value is in the inclusive interval [min..max]
1749 // false, otherwise.
1750 if (val >= min && val <= max) {
1751 return true;
1752 }
1753 jio_fprintf(defaultStream::error_stream(),
1754 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1755 " and " UINTX_FORMAT "\n",
1756 name, val, min, max);
1757 return false;
1758 }
1759
1760 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1761 // Returns true if given value is at least specified min threshold
1762 // false, otherwise.
1763 if (val >= min ) {
1764 return true;
1765 }
1766 jio_fprintf(defaultStream::error_stream(),
1767 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1768 name, val, min);
1769 return false;
1770 }
1771
1772 bool Arguments::verify_percentage(uintx value, const char* name) {
1773 if (value <= 100) {
1774 return true;
1775 }
1776 jio_fprintf(defaultStream::error_stream(),
1777 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1778 name, value);
1779 return false;
1780 }
1781
1782 #if !INCLUDE_ALL_GCS
1783 #ifdef ASSERT
1784 static bool verify_serial_gc_flags() {
1785 return (UseSerialGC &&
1786 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1787 UseParallelGC || UseParallelOldGC));
1788 }
1789 #endif // ASSERT
1790 #endif // INCLUDE_ALL_GCS
1791
1792 // check if do gclog rotation
1793 // +UseGCLogFileRotation is a must,
1794 // no gc log rotation when log file not supplied or
1795 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1796 void check_gclog_consistency() {
1797 if (UseGCLogFileRotation) {
1798 if ((Arguments::gc_log_filename() == NULL) ||
1799 (NumberOfGCLogFiles == 0) ||
1800 (GCLogFileSize == 0)) {
1801 jio_fprintf(defaultStream::output_stream(),
1802 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1803 "where num_of_file > 0 and num_of_size > 0\n"
1804 "GC log rotation is turned off\n");
1805 UseGCLogFileRotation = false;
1806 }
1807 }
1808
1809 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1810 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1811 jio_fprintf(defaultStream::output_stream(),
1812 "GCLogFileSize changed to minimum 8K\n");
1813 }
1814 }
1815
1816 // Check consistency of GC selection
1817 bool Arguments::check_gc_consistency() {
1818 check_gclog_consistency();
1819 bool status = true;
1820 // Ensure that the user has not selected conflicting sets
1821 // of collectors. [Note: this check is merely a user convenience;
1822 // collectors over-ride each other so that only a non-conflicting
1823 // set is selected; however what the user gets is not what they
1824 // may have expected from the combination they asked for. It's
1825 // better to reduce user confusion by not allowing them to
1826 // select conflicting combinations.
1827 uint i = 0;
1828 if (UseSerialGC) i++;
1829 if (UseConcMarkSweepGC || UseParNewGC) i++;
1830 if (UseParallelGC || UseParallelOldGC) i++;
1831 if (UseG1GC) i++;
1832 if (i > 1) {
1833 jio_fprintf(defaultStream::error_stream(),
1834 "Conflicting collector combinations in option list; "
1835 "please refer to the release notes for the combinations "
1836 "allowed\n");
1837 status = false;
1838 }
1839
1840 return status;
1841 }
1842
1843 void Arguments::check_deprecated_gcs() {
1844 if (UseConcMarkSweepGC && !UseParNewGC) {
1845 warning("Using the DefNew young collector with the CMS collector is deprecated "
1846 "and will likely be removed in a future release");
1847 }
1848
1849 if (UseParNewGC && !UseConcMarkSweepGC) {
1850 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't
1851 // set up UseSerialGC properly, so that can't be used in the check here.
1852 warning("Using the ParNew young collector with the Serial old collector is deprecated "
1853 "and will likely be removed in a future release");
1854 }
1855
1856 if (CMSIncrementalMode) {
1857 warning("Using incremental CMS is deprecated and will likely be removed in a future release");
1858 }
1859 }
1860
1861 void Arguments::check_deprecated_gc_flags() {
1862 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) {
1863 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated"
1864 "and will likely be removed in future release");
1865 }
1866 }
1867
1868 // Check stack pages settings
1869 bool Arguments::check_stack_pages()
1870 {
1871 bool status = true;
1872 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1873 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1874 // greater stack shadow pages can't generate instruction to bang stack
1875 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1876 return status;
1877 }
1878
1879 // Check the consistency of vm_init_args
1880 bool Arguments::check_vm_args_consistency() {
1881 // Method for adding checks for flag consistency.
1882 // The intent is to warn the user of all possible conflicts,
1883 // before returning an error.
1884 // Note: Needs platform-dependent factoring.
1885 bool status = true;
1886
1887 #if ( (defined(COMPILER2) && defined(SPARC)))
1888 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1889 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1890 // x86. Normally, VM_Version_init must be called from init_globals in
1891 // init.cpp, which is called by the initial java thread *after* arguments
1892 // have been parsed. VM_Version_init gets called twice on sparc.
1893 extern void VM_Version_init();
1894 VM_Version_init();
1895 if (!VM_Version::has_v9()) {
1896 jio_fprintf(defaultStream::error_stream(),
1897 "V8 Machine detected, Server requires V9\n");
1898 status = false;
1899 }
1900 #endif /* COMPILER2 && SPARC */
1901
1902 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1903 // builds so the cost of stack banging can be measured.
1904 #if (defined(PRODUCT) && defined(SOLARIS))
1905 if (!UseBoundThreads && !UseStackBanging) {
1906 jio_fprintf(defaultStream::error_stream(),
1907 "-UseStackBanging conflicts with -UseBoundThreads\n");
1908
1909 status = false;
1910 }
1911 #endif
1912
1913 if (TLABRefillWasteFraction == 0) {
1914 jio_fprintf(defaultStream::error_stream(),
1915 "TLABRefillWasteFraction should be a denominator, "
1916 "not " SIZE_FORMAT "\n",
1917 TLABRefillWasteFraction);
1918 status = false;
1919 }
1920
1921 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100,
1922 "AdaptiveSizePolicyWeight");
1923 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1924 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1925 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1926
1927 // Divide by bucket size to prevent a large size from causing rollover when
1928 // calculating amount of memory needed to be allocated for the String table.
1929 status = status && verify_interval(StringTableSize, minimumStringTableSize,
1930 (max_uintx / StringTable::bucket_size()), "StringTable size");
1931
1932 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1933 jio_fprintf(defaultStream::error_stream(),
1934 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1935 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1936 MinHeapFreeRatio, MaxHeapFreeRatio);
1937 status = false;
1938 }
1939 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1940 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1941
1942 // Min/MaxMetaspaceFreeRatio
1943 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio");
1944 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio");
1945
1946 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) {
1947 jio_fprintf(defaultStream::error_stream(),
1948 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or "
1949 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n",
1950 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "",
1951 MinMetaspaceFreeRatio,
1952 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "",
1953 MaxMetaspaceFreeRatio);
1954 status = false;
1955 }
1956
1957 // Trying to keep 100% free is not practical
1958 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99);
1959
1960 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1961 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1962 }
1963
1964 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1965 // Settings to encourage splitting.
1966 if (!FLAG_IS_CMDLINE(NewRatio)) {
1967 FLAG_SET_CMDLINE(uintx, NewRatio, 2);
1968 }
1969 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1970 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1971 }
1972 }
1973
1974 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1975 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1976 if (GCTimeLimit == 100) {
1977 // Turn off gc-overhead-limit-exceeded checks
1978 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1979 }
1980
1981 status = status && check_gc_consistency();
1982 status = status && check_stack_pages();
1983
1984 if (CMSIncrementalMode) {
1985 if (!UseConcMarkSweepGC) {
1986 jio_fprintf(defaultStream::error_stream(),
1987 "error: invalid argument combination.\n"
1988 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1989 "selected in order\nto use CMSIncrementalMode.\n");
1990 status = false;
1991 } else {
1992 status = status && verify_percentage(CMSIncrementalDutyCycle,
1993 "CMSIncrementalDutyCycle");
1994 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1995 "CMSIncrementalDutyCycleMin");
1996 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1997 "CMSIncrementalSafetyFactor");
1998 status = status && verify_percentage(CMSIncrementalOffset,
1999 "CMSIncrementalOffset");
2000 status = status && verify_percentage(CMSExpAvgFactor,
2001 "CMSExpAvgFactor");
2002 // If it was not set on the command line, set
2003 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
2004 if (CMSInitiatingOccupancyFraction < 0) {
2005 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
2006 }
2007 }
2008 }
2009
2010 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
2011 // insists that we hold the requisite locks so that the iteration is
2012 // MT-safe. For the verification at start-up and shut-down, we don't
2013 // yet have a good way of acquiring and releasing these locks,
2014 // which are not visible at the CollectedHeap level. We want to
2015 // be able to acquire these locks and then do the iteration rather
2016 // than just disable the lock verification. This will be fixed under
2017 // bug 4788986.
2018 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
2019 if (VerifyDuringStartup) {
2020 warning("Heap verification at start-up disabled "
2021 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2022 VerifyDuringStartup = false; // Disable verification at start-up
2023 }
2024
2025 if (VerifyBeforeExit) {
2026 warning("Heap verification at shutdown disabled "
2027 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
2028 VerifyBeforeExit = false; // Disable verification at shutdown
2029 }
2030 }
2031
2032 // Note: only executed in non-PRODUCT mode
2033 if (!UseAsyncConcMarkSweepGC &&
2034 (ExplicitGCInvokesConcurrent ||
2035 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
2036 jio_fprintf(defaultStream::error_stream(),
2037 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts"
2038 " with -UseAsyncConcMarkSweepGC");
2039 status = false;
2040 }
2041
2042 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
2043
2044 #if INCLUDE_ALL_GCS
2045 if (UseG1GC) {
2046 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
2047 "InitiatingHeapOccupancyPercent");
2048 status = status && verify_min_value(G1RefProcDrainInterval, 1,
2049 "G1RefProcDrainInterval");
2050 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
2051 "G1ConcMarkStepDurationMillis");
2052 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte,
2053 "G1ConcRSHotCardLimit");
2054 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31,
2055 "G1ConcRSLogCacheSize");
2056 }
2057 if (UseConcMarkSweepGC) {
2058 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills");
2059 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor");
2060 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax");
2061 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin");
2062
2063 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker");
2064
2065 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain");
2066 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight");
2067 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight");
2068
2069 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy");
2070
2071 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple");
2072 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple");
2073
2074 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter");
2075 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator");
2076 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator");
2077
2078 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy");
2079
2080 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold");
2081
2082 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration");
2083 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio");
2084 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum");
2085 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio");
2086 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage");
2087 }
2088
2089 if (UseParallelGC || UseParallelOldGC) {
2090 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean");
2091 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev");
2092
2093 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement");
2094 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement");
2095
2096 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay");
2097 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay");
2098
2099 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk");
2100
2101 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval");
2102 }
2103 #endif // INCLUDE_ALL_GCS
2104
2105 status = status && verify_interval(RefDiscoveryPolicy,
2106 ReferenceProcessor::DiscoveryPolicyMin,
2107 ReferenceProcessor::DiscoveryPolicyMax,
2108 "RefDiscoveryPolicy");
2109
2110 // Limit the lower bound of this flag to 1 as it is used in a division
2111 // expression.
2112 status = status && verify_interval(TLABWasteTargetPercent,
2113 1, 100, "TLABWasteTargetPercent");
2114
2115 status = status && verify_object_alignment();
2116
2117 status = status && verify_min_value(ClassMetaspaceSize, 1*M,
2118 "ClassMetaspaceSize");
2119
2120 status = status && verify_interval(MarkStackSizeMax,
2121 1, (max_jint - 1), "MarkStackSizeMax");
2122 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight");
2123
2124 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries");
2125
2126 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread");
2127
2128 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries");
2129
2130 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct");
2131 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct");
2132
2133 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread");
2134
2135 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction");
2136 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction");
2137 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction");
2138 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction");
2139
2140 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight");
2141 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor");
2142
2143 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight");
2144 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize");
2145 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction");
2146
2147 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement");
2148 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement");
2149
2150 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp
2151 // just for that, so hardcode here.
2152 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold");
2153 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold");
2154 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio");
2155 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio");
2156
2157 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount");
2158 #ifdef SPARC
2159 if (UseConcMarkSweepGC || UseG1GC) {
2160 // Issue a stern warning if the user has explicitly set
2161 // UseMemSetInBOT (it is known to cause issues), but allow
2162 // use for experimentation and debugging.
2163 if (VM_Version::is_sun4v() && UseMemSetInBOT) {
2164 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error");
2165 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability"
2166 " on sun4v; please understand that you are using at your own risk!");
2167 }
2168 }
2169 #endif // SPARC
2170
2171 if (PrintNMTStatistics) {
2172 #if INCLUDE_NMT
2173 if (MemTracker::tracking_level() == MemTracker::NMT_off) {
2174 #endif // INCLUDE_NMT
2175 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled");
2176 PrintNMTStatistics = false;
2177 #if INCLUDE_NMT
2178 }
2179 #endif
2180 }
2181
2182 // Need to limit the extent of the padding to reasonable size.
2183 // 8K is well beyond the reasonable HW cache line size, even with the
2184 // aggressive prefetching, while still leaving the room for segregating
2185 // among the distinct pages.
2186 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) {
2187 jio_fprintf(defaultStream::error_stream(),
2188 "ContendedPaddingWidth=" INTX_FORMAT " must be the between %d and %d\n",
2189 ContendedPaddingWidth, 0, 8192);
2190 status = false;
2191 }
2192
2193 // Need to enforce the padding not to break the existing field alignments.
2194 // It is sufficient to check against the largest type size.
2195 if ((ContendedPaddingWidth % BytesPerLong) != 0) {
2196 jio_fprintf(defaultStream::error_stream(),
2197 "ContendedPaddingWidth=" INTX_FORMAT " must be the multiple of %d\n",
2198 ContendedPaddingWidth, BytesPerLong);
2199 status = false;
2200 }
2201
2202 return status;
2203 }
2204
2205 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
2206 const char* option_type) {
2207 if (ignore) return false;
2208
2209 const char* spacer = " ";
2210 if (option_type == NULL) {
2211 option_type = ++spacer; // Set both to the empty string.
2212 }
2213
2214 if (os::obsolete_option(option)) {
2215 jio_fprintf(defaultStream::error_stream(),
2216 "Obsolete %s%soption: %s\n", option_type, spacer,
2217 option->optionString);
2218 return false;
2219 } else {
2220 jio_fprintf(defaultStream::error_stream(),
2221 "Unrecognized %s%soption: %s\n", option_type, spacer,
2222 option->optionString);
2223 return true;
2224 }
2225 }
2226
2227 static const char* user_assertion_options[] = {
2228 "-da", "-ea", "-disableassertions", "-enableassertions", 0
2229 };
2230
2231 static const char* system_assertion_options[] = {
2232 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
2233 };
2234
2235 // Return true if any of the strings in null-terminated array 'names' matches.
2236 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
2237 // the option must match exactly.
2238 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
2239 bool tail_allowed) {
2240 for (/* empty */; *names != NULL; ++names) {
2241 if (match_option(option, *names, tail)) {
2242 if (**tail == '\0' || tail_allowed && **tail == ':') {
2243 return true;
2244 }
2245 }
2246 }
2247 return false;
2248 }
2249
2250 bool Arguments::parse_uintx(const char* value,
2251 uintx* uintx_arg,
2252 uintx min_size) {
2253
2254 // Check the sign first since atomull() parses only unsigned values.
2255 bool value_is_positive = !(*value == '-');
2256
2257 if (value_is_positive) {
2258 julong n;
2259 bool good_return = atomull(value, &n);
2260 if (good_return) {
2261 bool above_minimum = n >= min_size;
2262 bool value_is_too_large = n > max_uintx;
2263
2264 if (above_minimum && !value_is_too_large) {
2265 *uintx_arg = n;
2266 return true;
2267 }
2268 }
2269 }
2270 return false;
2271 }
2272
2273 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2274 julong* long_arg,
2275 julong min_size) {
2276 if (!atomull(s, long_arg)) return arg_unreadable;
2277 return check_memory_size(*long_arg, min_size);
2278 }
2279
2280 // Parse JavaVMInitArgs structure
2281
2282 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2283 // For components of the system classpath.
2284 SysClassPath scp(Arguments::get_sysclasspath());
2285 bool scp_assembly_required = false;
2286
2287 // Save default settings for some mode flags
2288 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2289 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2290 Arguments::_ClipInlining = ClipInlining;
2291 Arguments::_BackgroundCompilation = BackgroundCompilation;
2292
2293 // Setup flags for mixed which is the default
2294 set_mode_flags(_mixed);
2295
2296 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2297 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2298 if (result != JNI_OK) {
2299 return result;
2300 }
2301
2302 // Parse JavaVMInitArgs structure passed in
2303 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2304 if (result != JNI_OK) {
2305 return result;
2306 }
2307
2308 if (AggressiveOpts) {
2309 // Insert alt-rt.jar between user-specified bootclasspath
2310 // prefix and the default bootclasspath. os::set_boot_path()
2311 // uses meta_index_dir as the default bootclasspath directory.
2312 const char* altclasses_jar = "alt-rt.jar";
2313 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2314 strlen(altclasses_jar);
2315 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal);
2316 strcpy(altclasses_path, get_meta_index_dir());
2317 strcat(altclasses_path, altclasses_jar);
2318 scp.add_suffix_to_prefix(altclasses_path);
2319 scp_assembly_required = true;
2320 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal);
2321 }
2322
2323 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2324 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2325 if (result != JNI_OK) {
2326 return result;
2327 }
2328
2329 // Do final processing now that all arguments have been parsed
2330 result = finalize_vm_init_args(&scp, scp_assembly_required);
2331 if (result != JNI_OK) {
2332 return result;
2333 }
2334
2335 return JNI_OK;
2336 }
2337
2338 // Checks if name in command-line argument -agent{lib,path}:name[=options]
2339 // represents a valid HPROF of JDWP agent. is_path==true denotes that we
2340 // are dealing with -agentpath (case where name is a path), otherwise with
2341 // -agentlib
2342 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) {
2343 char *_name;
2344 const char *_hprof = "hprof", *_jdwp = "jdwp";
2345 size_t _len_hprof, _len_jdwp, _len_prefix;
2346
2347 if (is_path) {
2348 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) {
2349 return false;
2350 }
2351
2352 _name++; // skip past last path separator
2353 _len_prefix = strlen(JNI_LIB_PREFIX);
2354
2355 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) {
2356 return false;
2357 }
2358
2359 _name += _len_prefix;
2360 _len_hprof = strlen(_hprof);
2361 _len_jdwp = strlen(_jdwp);
2362
2363 if (strncmp(_name, _hprof, _len_hprof) == 0) {
2364 _name += _len_hprof;
2365 }
2366 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) {
2367 _name += _len_jdwp;
2368 }
2369 else {
2370 return false;
2371 }
2372
2373 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) {
2374 return false;
2375 }
2376
2377 return true;
2378 }
2379
2380 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) {
2381 return true;
2382 }
2383
2384 return false;
2385 }
2386
2387 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2388 SysClassPath* scp_p,
2389 bool* scp_assembly_required_p,
2390 FlagValueOrigin origin) {
2391 // Remaining part of option string
2392 const char* tail;
2393
2394 // iterate over arguments
2395 for (int index = 0; index < args->nOptions; index++) {
2396 bool is_absolute_path = false; // for -agentpath vs -agentlib
2397
2398 const JavaVMOption* option = args->options + index;
2399
2400 if (!match_option(option, "-Djava.class.path", &tail) &&
2401 !match_option(option, "-Dsun.java.command", &tail) &&
2402 !match_option(option, "-Dsun.java.launcher", &tail)) {
2403
2404 // add all jvm options to the jvm_args string. This string
2405 // is used later to set the java.vm.args PerfData string constant.
2406 // the -Djava.class.path and the -Dsun.java.command options are
2407 // omitted from jvm_args string as each have their own PerfData
2408 // string constant object.
2409 build_jvm_args(option->optionString);
2410 }
2411
2412 // -verbose:[class/gc/jni]
2413 if (match_option(option, "-verbose", &tail)) {
2414 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2415 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2416 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2417 } else if (!strcmp(tail, ":gc")) {
2418 FLAG_SET_CMDLINE(bool, PrintGC, true);
2419 } else if (!strcmp(tail, ":jni")) {
2420 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2421 }
2422 // -da / -ea / -disableassertions / -enableassertions
2423 // These accept an optional class/package name separated by a colon, e.g.,
2424 // -da:java.lang.Thread.
2425 } else if (match_option(option, user_assertion_options, &tail, true)) {
2426 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2427 if (*tail == '\0') {
2428 JavaAssertions::setUserClassDefault(enable);
2429 } else {
2430 assert(*tail == ':', "bogus match by match_option()");
2431 JavaAssertions::addOption(tail + 1, enable);
2432 }
2433 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2434 } else if (match_option(option, system_assertion_options, &tail, false)) {
2435 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2436 JavaAssertions::setSystemClassDefault(enable);
2437 // -bootclasspath:
2438 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2439 scp_p->reset_path(tail);
2440 *scp_assembly_required_p = true;
2441 // -bootclasspath/a:
2442 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2443 scp_p->add_suffix(tail);
2444 *scp_assembly_required_p = true;
2445 // -bootclasspath/p:
2446 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2447 scp_p->add_prefix(tail);
2448 *scp_assembly_required_p = true;
2449 // -Xrun
2450 } else if (match_option(option, "-Xrun", &tail)) {
2451 if (tail != NULL) {
2452 const char* pos = strchr(tail, ':');
2453 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2454 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2455 name[len] = '\0';
2456
2457 char *options = NULL;
2458 if(pos != NULL) {
2459 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2460 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2);
2461 }
2462 #if !INCLUDE_JVMTI
2463 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2464 jio_fprintf(defaultStream::error_stream(),
2465 "Profiling and debugging agents are not supported in this VM\n");
2466 return JNI_ERR;
2467 }
2468 #endif // !INCLUDE_JVMTI
2469 add_init_library(name, options);
2470 }
2471 // -agentlib and -agentpath
2472 } else if (match_option(option, "-agentlib:", &tail) ||
2473 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2474 if(tail != NULL) {
2475 const char* pos = strchr(tail, '=');
2476 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2477 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len);
2478 name[len] = '\0';
2479
2480 char *options = NULL;
2481 if(pos != NULL) {
2482 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1);
2483 }
2484 #if !INCLUDE_JVMTI
2485 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) {
2486 jio_fprintf(defaultStream::error_stream(),
2487 "Profiling and debugging agents are not supported in this VM\n");
2488 return JNI_ERR;
2489 }
2490 #endif // !INCLUDE_JVMTI
2491 add_init_agent(name, options, is_absolute_path);
2492 }
2493 // -javaagent
2494 } else if (match_option(option, "-javaagent:", &tail)) {
2495 #if !INCLUDE_JVMTI
2496 jio_fprintf(defaultStream::error_stream(),
2497 "Instrumentation agents are not supported in this VM\n");
2498 return JNI_ERR;
2499 #else
2500 if(tail != NULL) {
2501 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail);
2502 add_init_agent("instrument", options, false);
2503 }
2504 #endif // !INCLUDE_JVMTI
2505 // -Xnoclassgc
2506 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2507 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2508 // -Xincgc: i-CMS
2509 } else if (match_option(option, "-Xincgc", &tail)) {
2510 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2511 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2512 // -Xnoincgc: no i-CMS
2513 } else if (match_option(option, "-Xnoincgc", &tail)) {
2514 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2515 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2516 // -Xconcgc
2517 } else if (match_option(option, "-Xconcgc", &tail)) {
2518 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2519 // -Xnoconcgc
2520 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2521 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2522 // -Xbatch
2523 } else if (match_option(option, "-Xbatch", &tail)) {
2524 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2525 // -Xmn for compatibility with other JVM vendors
2526 } else if (match_option(option, "-Xmn", &tail)) {
2527 julong long_initial_eden_size = 0;
2528 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2529 if (errcode != arg_in_range) {
2530 jio_fprintf(defaultStream::error_stream(),
2531 "Invalid initial eden size: %s\n", option->optionString);
2532 describe_range_error(errcode);
2533 return JNI_EINVAL;
2534 }
2535 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2536 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2537 // -Xms
2538 } else if (match_option(option, "-Xms", &tail)) {
2539 julong long_initial_heap_size = 0;
2540 // an initial heap size of 0 means automatically determine
2541 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0);
2542 if (errcode != arg_in_range) {
2543 jio_fprintf(defaultStream::error_stream(),
2544 "Invalid initial heap size: %s\n", option->optionString);
2545 describe_range_error(errcode);
2546 return JNI_EINVAL;
2547 }
2548 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2549 // Currently the minimum size and the initial heap sizes are the same.
2550 set_min_heap_size(InitialHeapSize);
2551 // -Xmx
2552 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) {
2553 julong long_max_heap_size = 0;
2554 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2555 if (errcode != arg_in_range) {
2556 jio_fprintf(defaultStream::error_stream(),
2557 "Invalid maximum heap size: %s\n", option->optionString);
2558 describe_range_error(errcode);
2559 return JNI_EINVAL;
2560 }
2561 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2562 // Xmaxf
2563 } else if (match_option(option, "-Xmaxf", &tail)) {
2564 int maxf = (int)(atof(tail) * 100);
2565 if (maxf < 0 || maxf > 100) {
2566 jio_fprintf(defaultStream::error_stream(),
2567 "Bad max heap free percentage size: %s\n",
2568 option->optionString);
2569 return JNI_EINVAL;
2570 } else {
2571 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2572 }
2573 // Xminf
2574 } else if (match_option(option, "-Xminf", &tail)) {
2575 int minf = (int)(atof(tail) * 100);
2576 if (minf < 0 || minf > 100) {
2577 jio_fprintf(defaultStream::error_stream(),
2578 "Bad min heap free percentage size: %s\n",
2579 option->optionString);
2580 return JNI_EINVAL;
2581 } else {
2582 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2583 }
2584 // -Xss
2585 } else if (match_option(option, "-Xss", &tail)) {
2586 julong long_ThreadStackSize = 0;
2587 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2588 if (errcode != arg_in_range) {
2589 jio_fprintf(defaultStream::error_stream(),
2590 "Invalid thread stack size: %s\n", option->optionString);
2591 describe_range_error(errcode);
2592 return JNI_EINVAL;
2593 }
2594 // Internally track ThreadStackSize in units of 1024 bytes.
2595 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2596 round_to((int)long_ThreadStackSize, K) / K);
2597 // -Xoss
2598 } else if (match_option(option, "-Xoss", &tail)) {
2599 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2600 // -Xmaxjitcodesize
2601 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2602 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2603 julong long_ReservedCodeCacheSize = 0;
2604 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2605 (size_t)InitialCodeCacheSize);
2606 if (errcode != arg_in_range) {
2607 jio_fprintf(defaultStream::error_stream(),
2608 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2609 option->optionString, InitialCodeCacheSize/K);
2610 describe_range_error(errcode);
2611 return JNI_EINVAL;
2612 }
2613 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2614 //-XX:IncreaseFirstTierCompileThresholdAt=
2615 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) {
2616 uintx uint_IncreaseFirstTierCompileThresholdAt = 0;
2617 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) {
2618 jio_fprintf(defaultStream::error_stream(),
2619 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n",
2620 option->optionString);
2621 return JNI_EINVAL;
2622 }
2623 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt);
2624 // -green
2625 } else if (match_option(option, "-green", &tail)) {
2626 jio_fprintf(defaultStream::error_stream(),
2627 "Green threads support not available\n");
2628 return JNI_EINVAL;
2629 // -native
2630 } else if (match_option(option, "-native", &tail)) {
2631 // HotSpot always uses native threads, ignore silently for compatibility
2632 // -Xsqnopause
2633 } else if (match_option(option, "-Xsqnopause", &tail)) {
2634 // EVM option, ignore silently for compatibility
2635 // -Xrs
2636 } else if (match_option(option, "-Xrs", &tail)) {
2637 // Classic/EVM option, new functionality
2638 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2639 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2640 // change default internal VM signals used - lower case for back compat
2641 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2642 // -Xoptimize
2643 } else if (match_option(option, "-Xoptimize", &tail)) {
2644 // EVM option, ignore silently for compatibility
2645 // -Xprof
2646 } else if (match_option(option, "-Xprof", &tail)) {
2647 #if INCLUDE_FPROF
2648 _has_profile = true;
2649 #else // INCLUDE_FPROF
2650 jio_fprintf(defaultStream::error_stream(),
2651 "Flat profiling is not supported in this VM.\n");
2652 return JNI_ERR;
2653 #endif // INCLUDE_FPROF
2654 // -Xconcurrentio
2655 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2656 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2657 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2658 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2659 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2660 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2661
2662 // -Xinternalversion
2663 } else if (match_option(option, "-Xinternalversion", &tail)) {
2664 jio_fprintf(defaultStream::output_stream(), "%s\n",
2665 VM_Version::internal_vm_info_string());
2666 vm_exit(0);
2667 #ifndef PRODUCT
2668 // -Xprintflags
2669 } else if (match_option(option, "-Xprintflags", &tail)) {
2670 CommandLineFlags::printFlags(tty, false);
2671 vm_exit(0);
2672 #endif
2673 // -D
2674 } else if (match_option(option, "-D", &tail)) {
2675 if (!add_property(tail)) {
2676 return JNI_ENOMEM;
2677 }
2678 // Out of the box management support
2679 if (match_option(option, "-Dcom.sun.management", &tail)) {
2680 #if INCLUDE_MANAGEMENT
2681 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2682 #else
2683 jio_fprintf(defaultStream::output_stream(),
2684 "-Dcom.sun.management is not supported in this VM.\n");
2685 return JNI_ERR;
2686 #endif
2687 }
2688 // -Xint
2689 } else if (match_option(option, "-Xint", &tail)) {
2690 set_mode_flags(_int);
2691 // -Xmixed
2692 } else if (match_option(option, "-Xmixed", &tail)) {
2693 set_mode_flags(_mixed);
2694 // -Xcomp
2695 } else if (match_option(option, "-Xcomp", &tail)) {
2696 // for testing the compiler; turn off all flags that inhibit compilation
2697 set_mode_flags(_comp);
2698 // -Xshare:dump
2699 } else if (match_option(option, "-Xshare:dump", &tail)) {
2700 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2701 set_mode_flags(_int); // Prevent compilation, which creates objects
2702 // -Xshare:on
2703 } else if (match_option(option, "-Xshare:on", &tail)) {
2704 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2705 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2706 // -Xshare:auto
2707 } else if (match_option(option, "-Xshare:auto", &tail)) {
2708 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2709 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2710 // -Xshare:off
2711 } else if (match_option(option, "-Xshare:off", &tail)) {
2712 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2713 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2714 // -Xverify
2715 } else if (match_option(option, "-Xverify", &tail)) {
2716 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2717 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2718 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2719 } else if (strcmp(tail, ":remote") == 0) {
2720 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2721 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2722 } else if (strcmp(tail, ":none") == 0) {
2723 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2724 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2725 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2726 return JNI_EINVAL;
2727 }
2728 // -Xdebug
2729 } else if (match_option(option, "-Xdebug", &tail)) {
2730 // note this flag has been used, then ignore
2731 set_xdebug_mode(true);
2732 // -Xnoagent
2733 } else if (match_option(option, "-Xnoagent", &tail)) {
2734 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2735 } else if (match_option(option, "-Xboundthreads", &tail)) {
2736 // Bind user level threads to kernel threads (Solaris only)
2737 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2738 } else if (match_option(option, "-Xloggc:", &tail)) {
2739 // Redirect GC output to the file. -Xloggc:<filename>
2740 // ostream_init_log(), when called will use this filename
2741 // to initialize a fileStream.
2742 _gc_log_filename = strdup(tail);
2743 FLAG_SET_CMDLINE(bool, PrintGC, true);
2744 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2745
2746 // JNI hooks
2747 } else if (match_option(option, "-Xcheck", &tail)) {
2748 if (!strcmp(tail, ":jni")) {
2749 #if !INCLUDE_JNI_CHECK
2750 warning("JNI CHECKING is not supported in this VM");
2751 #else
2752 CheckJNICalls = true;
2753 #endif // INCLUDE_JNI_CHECK
2754 } else if (is_bad_option(option, args->ignoreUnrecognized,
2755 "check")) {
2756 return JNI_EINVAL;
2757 }
2758 } else if (match_option(option, "vfprintf", &tail)) {
2759 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2760 } else if (match_option(option, "exit", &tail)) {
2761 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2762 } else if (match_option(option, "abort", &tail)) {
2763 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2764 // -XX:+AggressiveHeap
2765 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2766
2767 // This option inspects the machine and attempts to set various
2768 // parameters to be optimal for long-running, memory allocation
2769 // intensive jobs. It is intended for machines with large
2770 // amounts of cpu and memory.
2771
2772 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2773 // VM, but we may not be able to represent the total physical memory
2774 // available (like having 8gb of memory on a box but using a 32bit VM).
2775 // Thus, we need to make sure we're using a julong for intermediate
2776 // calculations.
2777 julong initHeapSize;
2778 julong total_memory = os::physical_memory();
2779
2780 if (total_memory < (julong)256*M) {
2781 jio_fprintf(defaultStream::error_stream(),
2782 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2783 vm_exit(1);
2784 }
2785
2786 // The heap size is half of available memory, or (at most)
2787 // all of possible memory less 160mb (leaving room for the OS
2788 // when using ISM). This is the maximum; because adaptive sizing
2789 // is turned on below, the actual space used may be smaller.
2790
2791 initHeapSize = MIN2(total_memory / (julong)2,
2792 total_memory - (julong)160*M);
2793
2794 initHeapSize = limit_by_allocatable_memory(initHeapSize);
2795
2796 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2797 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2798 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2799 // Currently the minimum size and the initial heap sizes are the same.
2800 set_min_heap_size(initHeapSize);
2801 }
2802 if (FLAG_IS_DEFAULT(NewSize)) {
2803 // Make the young generation 3/8ths of the total heap.
2804 FLAG_SET_CMDLINE(uintx, NewSize,
2805 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2806 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2807 }
2808
2809 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
2810 FLAG_SET_DEFAULT(UseLargePages, true);
2811 #endif
2812
2813 // Increase some data structure sizes for efficiency
2814 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2815 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2816 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2817
2818 // See the OldPLABSize comment below, but replace 'after promotion'
2819 // with 'after copying'. YoungPLABSize is the size of the survivor
2820 // space per-gc-thread buffers. The default is 4kw.
2821 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2822
2823 // OldPLABSize is the size of the buffers in the old gen that
2824 // UseParallelGC uses to promote live data that doesn't fit in the
2825 // survivor spaces. At any given time, there's one for each gc thread.
2826 // The default size is 1kw. These buffers are rarely used, since the
2827 // survivor spaces are usually big enough. For specjbb, however, there
2828 // are occasions when there's lots of live data in the young gen
2829 // and we end up promoting some of it. We don't have a definite
2830 // explanation for why bumping OldPLABSize helps, but the theory
2831 // is that a bigger PLAB results in retaining something like the
2832 // original allocation order after promotion, which improves mutator
2833 // locality. A minor effect may be that larger PLABs reduce the
2834 // number of PLAB allocation events during gc. The value of 8kw
2835 // was arrived at by experimenting with specjbb.
2836 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2837
2838 // Enable parallel GC and adaptive generation sizing
2839 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2840 FLAG_SET_DEFAULT(ParallelGCThreads,
2841 Abstract_VM_Version::parallel_worker_threads());
2842
2843 // Encourage steady state memory management
2844 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2845
2846 // This appears to improve mutator locality
2847 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2848
2849 // Get around early Solaris scheduling bug
2850 // (affinity vs other jobs on system)
2851 // but disallow DR and offlining (5008695).
2852 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2853
2854 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2855 // The last option must always win.
2856 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2857 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2858 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2859 // The last option must always win.
2860 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2861 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2862 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2863 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2864 jio_fprintf(defaultStream::error_stream(),
2865 "Please use CMSClassUnloadingEnabled in place of "
2866 "CMSPermGenSweepingEnabled in the future\n");
2867 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2868 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2869 jio_fprintf(defaultStream::error_stream(),
2870 "Please use -XX:+UseGCOverheadLimit in place of "
2871 "-XX:+UseGCTimeLimit in the future\n");
2872 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2873 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2874 jio_fprintf(defaultStream::error_stream(),
2875 "Please use -XX:-UseGCOverheadLimit in place of "
2876 "-XX:-UseGCTimeLimit in the future\n");
2877 // The TLE options are for compatibility with 1.3 and will be
2878 // removed without notice in a future release. These options
2879 // are not to be documented.
2880 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2881 // No longer used.
2882 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2883 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2884 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2885 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2886 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2887 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2888 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2889 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2890 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2891 // No longer used.
2892 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2893 julong long_tlab_size = 0;
2894 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2895 if (errcode != arg_in_range) {
2896 jio_fprintf(defaultStream::error_stream(),
2897 "Invalid TLAB size: %s\n", option->optionString);
2898 describe_range_error(errcode);
2899 return JNI_EINVAL;
2900 }
2901 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2902 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2903 // No longer used.
2904 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2905 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2906 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2907 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2908 SOLARIS_ONLY(
2909 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2910 warning("-XX:+UsePermISM is obsolete.");
2911 FLAG_SET_CMDLINE(bool, UseISM, true);
2912 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2913 FLAG_SET_CMDLINE(bool, UseISM, false);
2914 )
2915 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2916 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2917 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2918 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2919 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2920 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2921 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2922 #if defined(DTRACE_ENABLED)
2923 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2924 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2925 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2926 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2927 #else // defined(DTRACE_ENABLED)
2928 jio_fprintf(defaultStream::error_stream(),
2929 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2930 return JNI_EINVAL;
2931 #endif // defined(DTRACE_ENABLED)
2932 #ifdef ASSERT
2933 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2934 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2935 // disable scavenge before parallel mark-compact
2936 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2937 #endif
2938 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2939 julong cms_blocks_to_claim = (julong)atol(tail);
2940 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2941 jio_fprintf(defaultStream::error_stream(),
2942 "Please use -XX:OldPLABSize in place of "
2943 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2944 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2945 julong cms_blocks_to_claim = (julong)atol(tail);
2946 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2947 jio_fprintf(defaultStream::error_stream(),
2948 "Please use -XX:OldPLABSize in place of "
2949 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2950 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2951 julong old_plab_size = 0;
2952 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2953 if (errcode != arg_in_range) {
2954 jio_fprintf(defaultStream::error_stream(),
2955 "Invalid old PLAB size: %s\n", option->optionString);
2956 describe_range_error(errcode);
2957 return JNI_EINVAL;
2958 }
2959 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2960 jio_fprintf(defaultStream::error_stream(),
2961 "Please use -XX:OldPLABSize in place of "
2962 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2963 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2964 julong young_plab_size = 0;
2965 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2966 if (errcode != arg_in_range) {
2967 jio_fprintf(defaultStream::error_stream(),
2968 "Invalid young PLAB size: %s\n", option->optionString);
2969 describe_range_error(errcode);
2970 return JNI_EINVAL;
2971 }
2972 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2973 jio_fprintf(defaultStream::error_stream(),
2974 "Please use -XX:YoungPLABSize in place of "
2975 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2976 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2977 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2978 julong stack_size = 0;
2979 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2980 if (errcode != arg_in_range) {
2981 jio_fprintf(defaultStream::error_stream(),
2982 "Invalid mark stack size: %s\n", option->optionString);
2983 describe_range_error(errcode);
2984 return JNI_EINVAL;
2985 }
2986 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2987 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2988 julong max_stack_size = 0;
2989 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2990 if (errcode != arg_in_range) {
2991 jio_fprintf(defaultStream::error_stream(),
2992 "Invalid maximum mark stack size: %s\n",
2993 option->optionString);
2994 describe_range_error(errcode);
2995 return JNI_EINVAL;
2996 }
2997 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2998 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2999 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
3000 uintx conc_threads = 0;
3001 if (!parse_uintx(tail, &conc_threads, 1)) {
3002 jio_fprintf(defaultStream::error_stream(),
3003 "Invalid concurrent threads: %s\n", option->optionString);
3004 return JNI_EINVAL;
3005 }
3006 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
3007 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) {
3008 julong max_direct_memory_size = 0;
3009 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0);
3010 if (errcode != arg_in_range) {
3011 jio_fprintf(defaultStream::error_stream(),
3012 "Invalid maximum direct memory size: %s\n",
3013 option->optionString);
3014 describe_range_error(errcode);
3015 return JNI_EINVAL;
3016 }
3017 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size);
3018 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) {
3019 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go
3020 // away and will cause VM initialization failures!
3021 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release.");
3022 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true);
3023 #if !INCLUDE_MANAGEMENT
3024 } else if (match_option(option, "-XX:+ManagementServer", &tail)) {
3025 jio_fprintf(defaultStream::error_stream(),
3026 "ManagementServer is not supported in this VM.\n");
3027 return JNI_ERR;
3028 #endif // INCLUDE_MANAGEMENT
3029 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
3030 // Skip -XX:Flags= since that case has already been handled
3031 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
3032 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
3033 return JNI_EINVAL;
3034 }
3035 }
3036 // Unknown option
3037 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
3038 return JNI_ERR;
3039 }
3040 }
3041
3042 // Change the default value for flags which have different default values
3043 // when working with older JDKs.
3044 #ifdef LINUX
3045 if (JDK_Version::current().compare_major(6) <= 0 &&
3046 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
3047 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
3048 }
3049 #endif // LINUX
3050 return JNI_OK;
3051 }
3052
3053 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
3054 // This must be done after all -D arguments have been processed.
3055 scp_p->expand_endorsed();
3056
3057 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
3058 // Assemble the bootclasspath elements into the final path.
3059 Arguments::set_sysclasspath(scp_p->combined_path());
3060 }
3061
3062 // This must be done after all arguments have been processed.
3063 // java_compiler() true means set to "NONE" or empty.
3064 if (java_compiler() && !xdebug_mode()) {
3065 // For backwards compatibility, we switch to interpreted mode if
3066 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
3067 // not specified.
3068 set_mode_flags(_int);
3069 }
3070 if (CompileThreshold == 0) {
3071 set_mode_flags(_int);
3072 }
3073
3074 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set
3075 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) {
3076 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold);
3077 }
3078
3079 #ifndef COMPILER2
3080 // Don't degrade server performance for footprint
3081 if (FLAG_IS_DEFAULT(UseLargePages) &&
3082 MaxHeapSize < LargePageHeapSizeThreshold) {
3083 // No need for large granularity pages w/small heaps.
3084 // Note that large pages are enabled/disabled for both the
3085 // Java heap and the code cache.
3086 FLAG_SET_DEFAULT(UseLargePages, false);
3087 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
3088 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
3089 }
3090
3091 // Tiered compilation is undefined with C1.
3092 TieredCompilation = false;
3093 #else
3094 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
3095 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
3096 }
3097 #endif
3098
3099 // If we are running in a headless jre, force java.awt.headless property
3100 // to be true unless the property has already been set.
3101 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
3102 if (os::is_headless_jre()) {
3103 const char* headless = Arguments::get_property("java.awt.headless");
3104 if (headless == NULL) {
3105 char envbuffer[128];
3106 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
3107 if (!add_property("java.awt.headless=true")) {
3108 return JNI_ENOMEM;
3109 }
3110 } else {
3111 char buffer[256];
3112 strcpy(buffer, "java.awt.headless=");
3113 strcat(buffer, envbuffer);
3114 if (!add_property(buffer)) {
3115 return JNI_ENOMEM;
3116 }
3117 }
3118 }
3119 }
3120
3121 if (!check_vm_args_consistency()) {
3122 return JNI_ERR;
3123 }
3124
3125 return JNI_OK;
3126 }
3127
3128 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3129 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
3130 scp_assembly_required_p);
3131 }
3132
3133 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
3134 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
3135 scp_assembly_required_p);
3136 }
3137
3138 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
3139 const int N_MAX_OPTIONS = 64;
3140 const int OPTION_BUFFER_SIZE = 1024;
3141 char buffer[OPTION_BUFFER_SIZE];
3142
3143 // The variable will be ignored if it exceeds the length of the buffer.
3144 // Don't check this variable if user has special privileges
3145 // (e.g. unix su command).
3146 if (os::getenv(name, buffer, sizeof(buffer)) &&
3147 !os::have_special_privileges()) {
3148 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
3149 jio_fprintf(defaultStream::error_stream(),
3150 "Picked up %s: %s\n", name, buffer);
3151 char* rd = buffer; // pointer to the input string (rd)
3152 int i;
3153 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
3154 while (isspace(*rd)) rd++; // skip whitespace
3155 if (*rd == 0) break; // we re done when the input string is read completely
3156
3157 // The output, option string, overwrites the input string.
3158 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
3159 // input string (rd).
3160 char* wrt = rd;
3161
3162 options[i++].optionString = wrt; // Fill in option
3163 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
3164 if (*rd == '\'' || *rd == '"') { // handle a quoted string
3165 int quote = *rd; // matching quote to look for
3166 rd++; // don't copy open quote
3167 while (*rd != quote) { // include everything (even spaces) up until quote
3168 if (*rd == 0) { // string termination means unmatched string
3169 jio_fprintf(defaultStream::error_stream(),
3170 "Unmatched quote in %s\n", name);
3171 return JNI_ERR;
3172 }
3173 *wrt++ = *rd++; // copy to option string
3174 }
3175 rd++; // don't copy close quote
3176 } else {
3177 *wrt++ = *rd++; // copy to option string
3178 }
3179 }
3180 // Need to check if we're done before writing a NULL,
3181 // because the write could be to the byte that rd is pointing to.
3182 if (*rd++ == 0) {
3183 *wrt = 0;
3184 break;
3185 }
3186 *wrt = 0; // Zero terminate option
3187 }
3188 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
3189 JavaVMInitArgs vm_args;
3190 vm_args.version = JNI_VERSION_1_2;
3191 vm_args.options = options;
3192 vm_args.nOptions = i;
3193 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
3194
3195 if (PrintVMOptions) {
3196 const char* tail;
3197 for (int i = 0; i < vm_args.nOptions; i++) {
3198 const JavaVMOption *option = vm_args.options + i;
3199 if (match_option(option, "-XX:", &tail)) {
3200 logOption(tail);
3201 }
3202 }
3203 }
3204
3205 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
3206 }
3207 return JNI_OK;
3208 }
3209
3210 void Arguments::set_shared_spaces_flags() {
3211 #ifdef _LP64
3212 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
3213
3214 // CompressedOops cannot be used with CDS. The offsets of oopmaps and
3215 // static fields are incorrect in the archive. With some more clever
3216 // initialization, this restriction can probably be lifted.
3217 if (UseCompressedOops) {
3218 if (must_share) {
3219 warning("disabling compressed oops because of %s",
3220 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
3221 FLAG_SET_CMDLINE(bool, UseCompressedOops, false);
3222 FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false);
3223 } else {
3224 // Prefer compressed oops to class data sharing
3225 if (UseSharedSpaces && Verbose) {
3226 warning("turning off use of shared archive because of compressed oops");
3227 }
3228 no_shared_spaces();
3229 }
3230 }
3231 #endif
3232
3233 if (DumpSharedSpaces) {
3234 if (RequireSharedSpaces) {
3235 warning("cannot dump shared archive while using shared archive");
3236 }
3237 UseSharedSpaces = false;
3238 }
3239 }
3240
3241 // Disable options not supported in this release, with a warning if they
3242 // were explicitly requested on the command-line
3243 #define UNSUPPORTED_OPTION(opt, description) \
3244 do { \
3245 if (opt) { \
3246 if (FLAG_IS_CMDLINE(opt)) { \
3247 warning(description " is disabled in this release."); \
3248 } \
3249 FLAG_SET_DEFAULT(opt, false); \
3250 } \
3251 } while(0)
3252
3253
3254 #define UNSUPPORTED_GC_OPTION(gc) \
3255 do { \
3256 if (gc) { \
3257 if (FLAG_IS_CMDLINE(gc)) { \
3258 warning(#gc " is not supported in this VM. Using Serial GC."); \
3259 } \
3260 FLAG_SET_DEFAULT(gc, false); \
3261 } \
3262 } while(0)
3263
3264 #if !INCLUDE_ALL_GCS
3265 static void force_serial_gc() {
3266 FLAG_SET_DEFAULT(UseSerialGC, true);
3267 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
3268 UNSUPPORTED_GC_OPTION(UseG1GC);
3269 UNSUPPORTED_GC_OPTION(UseParallelGC);
3270 UNSUPPORTED_GC_OPTION(UseParallelOldGC);
3271 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC);
3272 UNSUPPORTED_GC_OPTION(UseParNewGC);
3273 }
3274 #endif // INCLUDE_ALL_GCS
3275
3276 // Sharing support
3277 // Construct the path to the archive
3278 static char* get_shared_archive_path() {
3279 char *shared_archive_path;
3280 if (SharedArchiveFile == NULL) {
3281 char jvm_path[JVM_MAXPATHLEN];
3282 os::jvm_path(jvm_path, sizeof(jvm_path));
3283 char *end = strrchr(jvm_path, *os::file_separator());
3284 if (end != NULL) *end = '\0';
3285 size_t jvm_path_len = strlen(jvm_path);
3286 size_t file_sep_len = strlen(os::file_separator());
3287 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len +
3288 file_sep_len + 20, mtInternal);
3289 if (shared_archive_path != NULL) {
3290 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1);
3291 strncat(shared_archive_path, os::file_separator(), file_sep_len);
3292 strncat(shared_archive_path, "classes.jsa", 11);
3293 }
3294 } else {
3295 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal);
3296 if (shared_archive_path != NULL) {
3297 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1);
3298 }
3299 }
3300 return shared_archive_path;
3301 }
3302
3303 // Parse entry point called from JNI_CreateJavaVM
3304
3305 jint Arguments::parse(const JavaVMInitArgs* args) {
3306
3307 // Remaining part of option string
3308 const char* tail;
3309
3310 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
3311 const char* hotspotrc = ".hotspotrc";
3312 bool settings_file_specified = false;
3313 bool needs_hotspotrc_warning = false;
3314
3315 const char* flags_file;
3316 int index;
3317 for (index = 0; index < args->nOptions; index++) {
3318 const JavaVMOption *option = args->options + index;
3319 if (match_option(option, "-XX:Flags=", &tail)) {
3320 flags_file = tail;
3321 settings_file_specified = true;
3322 }
3323 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
3324 PrintVMOptions = true;
3325 }
3326 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
3327 PrintVMOptions = false;
3328 }
3329 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
3330 IgnoreUnrecognizedVMOptions = true;
3331 }
3332 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
3333 IgnoreUnrecognizedVMOptions = false;
3334 }
3335 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
3336 CommandLineFlags::printFlags(tty, false);
3337 vm_exit(0);
3338 }
3339 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) {
3340 #if INCLUDE_NMT
3341 MemTracker::init_tracking_options(tail);
3342 #else
3343 jio_fprintf(defaultStream::error_stream(),
3344 "Native Memory Tracking is not supported in this VM\n");
3345 return JNI_ERR;
3346 #endif
3347 }
3348
3349
3350 #ifndef PRODUCT
3351 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3352 CommandLineFlags::printFlags(tty, true);
3353 vm_exit(0);
3354 }
3355 #endif
3356 }
3357
3358 if (IgnoreUnrecognizedVMOptions) {
3359 // uncast const to modify the flag args->ignoreUnrecognized
3360 *(jboolean*)(&args->ignoreUnrecognized) = true;
3361 }
3362
3363 // Parse specified settings file
3364 if (settings_file_specified) {
3365 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3366 return JNI_EINVAL;
3367 }
3368 } else {
3369 #ifdef ASSERT
3370 // Parse default .hotspotrc settings file
3371 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3372 return JNI_EINVAL;
3373 }
3374 #else
3375 struct stat buf;
3376 if (os::stat(hotspotrc, &buf) == 0) {
3377 needs_hotspotrc_warning = true;
3378 }
3379 #endif
3380 }
3381
3382 if (PrintVMOptions) {
3383 for (index = 0; index < args->nOptions; index++) {
3384 const JavaVMOption *option = args->options + index;
3385 if (match_option(option, "-XX:", &tail)) {
3386 logOption(tail);
3387 }
3388 }
3389 }
3390
3391 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3392 jint result = parse_vm_init_args(args);
3393 if (result != JNI_OK) {
3394 return result;
3395 }
3396
3397 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed.
3398 SharedArchivePath = get_shared_archive_path();
3399 if (SharedArchivePath == NULL) {
3400 return JNI_ENOMEM;
3401 }
3402
3403 // Delay warning until here so that we've had a chance to process
3404 // the -XX:-PrintWarnings flag
3405 if (needs_hotspotrc_warning) {
3406 warning("%s file is present but has been ignored. "
3407 "Run with -XX:Flags=%s to load the file.",
3408 hotspotrc, hotspotrc);
3409 }
3410
3411 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD.
3412 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages");
3413 #endif
3414
3415 #if INCLUDE_ALL_GCS
3416 #if (defined JAVASE_EMBEDDED || defined ARM)
3417 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3418 #endif
3419 #endif
3420
3421 #ifndef PRODUCT
3422 if (TraceBytecodesAt != 0) {
3423 TraceBytecodes = true;
3424 }
3425 if (CountCompiledCalls) {
3426 if (UseCounterDecay) {
3427 warning("UseCounterDecay disabled because CountCalls is set");
3428 UseCounterDecay = false;
3429 }
3430 }
3431 #endif // PRODUCT
3432
3433 // JSR 292 is not supported before 1.7
3434 if (!JDK_Version::is_gte_jdk17x_version()) {
3435 if (EnableInvokeDynamic) {
3436 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3437 warning("JSR 292 is not supported before 1.7. Disabling support.");
3438 }
3439 EnableInvokeDynamic = false;
3440 }
3441 }
3442
3443 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3444 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3445 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3446 }
3447 ScavengeRootsInCode = 1;
3448 }
3449
3450 if (PrintGCDetails) {
3451 // Turn on -verbose:gc options as well
3452 PrintGC = true;
3453 }
3454
3455 if (!JDK_Version::is_gte_jdk18x_version()) {
3456 // To avoid changing the log format for 7 updates this flag is only
3457 // true by default in JDK8 and above.
3458 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3459 FLAG_SET_DEFAULT(PrintGCCause, false);
3460 }
3461 }
3462
3463 // Set object alignment values.
3464 set_object_alignment();
3465
3466 #if !INCLUDE_ALL_GCS
3467 force_serial_gc();
3468 #endif // INCLUDE_ALL_GCS
3469 #if !INCLUDE_CDS
3470 if (DumpSharedSpaces || RequireSharedSpaces) {
3471 jio_fprintf(defaultStream::error_stream(),
3472 "Shared spaces are not supported in this VM\n");
3473 return JNI_ERR;
3474 }
3475 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) {
3476 warning("Shared spaces are not supported in this VM");
3477 FLAG_SET_DEFAULT(UseSharedSpaces, false);
3478 FLAG_SET_DEFAULT(PrintSharedSpaces, false);
3479 }
3480 no_shared_spaces();
3481 #endif // INCLUDE_CDS
3482
3483 // Set flags based on ergonomics.
3484 set_ergonomics_flags();
3485
3486 set_shared_spaces_flags();
3487
3488 // Check the GC selections again.
3489 if (!check_gc_consistency()) {
3490 return JNI_EINVAL;
3491 }
3492
3493 if (TieredCompilation) {
3494 set_tiered_flags();
3495 } else {
3496 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3497 if (CompilationPolicyChoice >= 2) {
3498 vm_exit_during_initialization(
3499 "Incompatible compilation policy selected", NULL);
3500 }
3501 }
3502
3503 // Set heap size based on available physical memory
3504 set_heap_size();
3505
3506 #if INCLUDE_ALL_GCS
3507 // Set per-collector flags
3508 if (UseParallelGC || UseParallelOldGC) {
3509 set_parallel_gc_flags();
3510 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3511 set_cms_and_parnew_gc_flags();
3512 } else if (UseParNewGC) { // skipped if CMS is set above
3513 set_parnew_gc_flags();
3514 } else if (UseG1GC) {
3515 set_g1_gc_flags();
3516 }
3517 check_deprecated_gcs();
3518 check_deprecated_gc_flags();
3519 if (AssumeMP && !UseSerialGC) {
3520 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) {
3521 warning("If the number of processors is expected to increase from one, then"
3522 " you should configure the number of parallel GC threads appropriately"
3523 " using -XX:ParallelGCThreads=N");
3524 }
3525 }
3526 #else // INCLUDE_ALL_GCS
3527 assert(verify_serial_gc_flags(), "SerialGC unset");
3528 #endif // INCLUDE_ALL_GCS
3529
3530 // Set bytecode rewriting flags
3531 set_bytecode_flags();
3532
3533 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3534 set_aggressive_opts_flags();
3535
3536 // Turn off biased locking for locking debug mode flags,
3537 // which are subtlely different from each other but neither works with
3538 // biased locking.
3539 if (UseHeavyMonitors
3540 #ifdef COMPILER1
3541 || !UseFastLocking
3542 #endif // COMPILER1
3543 ) {
3544 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3545 // flag set to true on command line; warn the user that they
3546 // can't enable biased locking here
3547 warning("Biased Locking is not supported with locking debug flags"
3548 "; ignoring UseBiasedLocking flag." );
3549 }
3550 UseBiasedLocking = false;
3551 }
3552
3553 #ifdef CC_INTERP
3554 // Clear flags not supported by the C++ interpreter
3555 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3556 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3557 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3558 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false));
3559 #endif // CC_INTERP
3560
3561 #ifdef COMPILER2
3562 if (!UseBiasedLocking || EmitSync != 0) {
3563 UseOptoBiasInlining = false;
3564 }
3565 if (!EliminateLocks) {
3566 EliminateNestedLocks = false;
3567 }
3568 if (!Inline) {
3569 IncrementalInline = false;
3570 }
3571 #ifndef PRODUCT
3572 if (!IncrementalInline) {
3573 AlwaysIncrementalInline = false;
3574 }
3575 #endif
3576 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) {
3577 // incremental inlining: bump MaxNodeLimit
3578 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000);
3579 }
3580 #endif
3581
3582 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3583 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3584 DebugNonSafepoints = true;
3585 }
3586
3587 #ifndef PRODUCT
3588 if (CompileTheWorld) {
3589 // Force NmethodSweeper to sweep whole CodeCache each time.
3590 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3591 NmethodSweepFraction = 1;
3592 }
3593 }
3594 #endif
3595
3596 if (PrintCommandLineFlags) {
3597 CommandLineFlags::printSetFlags(tty);
3598 }
3599
3600 // Apply CPU specific policy for the BiasedLocking
3601 if (UseBiasedLocking) {
3602 if (!VM_Version::use_biased_locking() &&
3603 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3604 UseBiasedLocking = false;
3605 }
3606 }
3607
3608 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3609 // but only if not already set on the commandline
3610 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3611 bool set = false;
3612 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3613 if (!set) {
3614 FLAG_SET_DEFAULT(PauseAtExit, true);
3615 }
3616 }
3617
3618 return JNI_OK;
3619 }
3620
3621 jint Arguments::adjust_after_os() {
3622 #if INCLUDE_ALL_GCS
3623 if (UseParallelGC || UseParallelOldGC) {
3624 if (UseNUMA) {
3625 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
3626 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
3627 }
3628 // For those collectors or operating systems (eg, Windows) that do
3629 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
3630 UseNUMAInterleaving = true;
3631 }
3632 }
3633 #endif // INCLUDE_ALL_GCS
3634 return JNI_OK;
3635 }
3636
3637 int Arguments::PropertyList_count(SystemProperty* pl) {
3638 int count = 0;
3639 while(pl != NULL) {
3640 count++;
3641 pl = pl->next();
3642 }
3643 return count;
3644 }
3645
3646 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3647 assert(key != NULL, "just checking");
3648 SystemProperty* prop;
3649 for (prop = pl; prop != NULL; prop = prop->next()) {
3650 if (strcmp(key, prop->key()) == 0) return prop->value();
3651 }
3652 return NULL;
3653 }
3654
3655 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3656 int count = 0;
3657 const char* ret_val = NULL;
3658
3659 while(pl != NULL) {
3660 if(count >= index) {
3661 ret_val = pl->key();
3662 break;
3663 }
3664 count++;
3665 pl = pl->next();
3666 }
3667
3668 return ret_val;
3669 }
3670
3671 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3672 int count = 0;
3673 char* ret_val = NULL;
3674
3675 while(pl != NULL) {
3676 if(count >= index) {
3677 ret_val = pl->value();
3678 break;
3679 }
3680 count++;
3681 pl = pl->next();
3682 }
3683
3684 return ret_val;
3685 }
3686
3687 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3688 SystemProperty* p = *plist;
3689 if (p == NULL) {
3690 *plist = new_p;
3691 } else {
3692 while (p->next() != NULL) {
3693 p = p->next();
3694 }
3695 p->set_next(new_p);
3696 }
3697 }
3698
3699 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3700 if (plist == NULL)
3701 return;
3702
3703 SystemProperty* new_p = new SystemProperty(k, v, true);
3704 PropertyList_add(plist, new_p);
3705 }
3706
3707 // This add maintains unique property key in the list.
3708 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3709 if (plist == NULL)
3710 return;
3711
3712 // If property key exist then update with new value.
3713 SystemProperty* prop;
3714 for (prop = *plist; prop != NULL; prop = prop->next()) {
3715 if (strcmp(k, prop->key()) == 0) {
3716 if (append) {
3717 prop->append_value(v);
3718 } else {
3719 prop->set_value(v);
3720 }
3721 return;
3722 }
3723 }
3724
3725 PropertyList_add(plist, k, v);
3726 }
3727
3728 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3729 // Returns true if all of the source pointed by src has been copied over to
3730 // the destination buffer pointed by buf. Otherwise, returns false.
3731 // Notes:
3732 // 1. If the length (buflen) of the destination buffer excluding the
3733 // NULL terminator character is not long enough for holding the expanded
3734 // pid characters, it also returns false instead of returning the partially
3735 // expanded one.
3736 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3737 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3738 char* buf, size_t buflen) {
3739 const char* p = src;
3740 char* b = buf;
3741 const char* src_end = &src[srclen];
3742 char* buf_end = &buf[buflen - 1];
3743
3744 while (p < src_end && b < buf_end) {
3745 if (*p == '%') {
3746 switch (*(++p)) {
3747 case '%': // "%%" ==> "%"
3748 *b++ = *p++;
3749 break;
3750 case 'p': { // "%p" ==> current process id
3751 // buf_end points to the character before the last character so
3752 // that we could write '\0' to the end of the buffer.
3753 size_t buf_sz = buf_end - b + 1;
3754 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3755
3756 // if jio_snprintf fails or the buffer is not long enough to hold
3757 // the expanded pid, returns false.
3758 if (ret < 0 || ret >= (int)buf_sz) {
3759 return false;
3760 } else {
3761 b += ret;
3762 assert(*b == '\0', "fail in copy_expand_pid");
3763 if (p == src_end && b == buf_end + 1) {
3764 // reach the end of the buffer.
3765 return true;
3766 }
3767 }
3768 p++;
3769 break;
3770 }
3771 default :
3772 *b++ = '%';
3773 }
3774 } else {
3775 *b++ = *p++;
3776 }
3777 }
3778 *b = '\0';
3779 return (p == src_end); // return false if not all of the source was copied
3780 }