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