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 if (UseNUMA) {
1428 // For those collectors or operating systems (eg, Windows) that do
1429 // not support full UseNUMA, we will map to UseNUMAInterleaving
1430 UseNUMAInterleaving = true;
1431 }
1432
1433
1434 }
1435
1436 void Arguments::set_g1_gc_flags() {
1437 assert(UseG1GC, "Error");
1438 #ifdef COMPILER1
1439 FastTLABRefill = false;
1440 #endif
1441 FLAG_SET_DEFAULT(ParallelGCThreads,
1442 Abstract_VM_Version::parallel_worker_threads());
1443 if (ParallelGCThreads == 0) {
1444 FLAG_SET_DEFAULT(ParallelGCThreads,
1445 Abstract_VM_Version::parallel_worker_threads());
1446 }
1447 no_shared_spaces();
1448
1449 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1450 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1451 }
1452 if (PrintGCDetails && Verbose) {
1453 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1454 MarkStackSize / K, MarkStackSizeMax / K);
1455 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1456 }
1457
1458 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1459 // In G1, we want the default GC overhead goal to be higher than
1460 // say in PS. So we set it here to 10%. Otherwise the heap might
1461 // be expanded more aggressively than we would like it to. In
1462 // fact, even 10% seems to not be high enough in some cases
1463 // (especially small GC stress tests that the main thing they do
1464 // is allocation). We might consider increase it further.
1465 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1466 }
1467 }
1468
1469 void Arguments::set_heap_size() {
1470 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1471 // Deprecated flag
1472 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1473 }
1474
1475 const julong phys_mem =
1476 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1477 : (julong)MaxRAM;
1478
1479 // If the maximum heap size has not been set with -Xmx,
1480 // then set it as fraction of the size of physical memory,
1481 // respecting the maximum and minimum sizes of the heap.
1482 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1483 julong reasonable_max = phys_mem / MaxRAMFraction;
1484
1485 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1486 // Small physical memory, so use a minimum fraction of it for the heap
1487 reasonable_max = phys_mem / MinRAMFraction;
1488 } else {
1489 // Not-small physical memory, so require a heap at least
1490 // as large as MaxHeapSize
1491 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1492 }
1493 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1494 // Limit the heap size to ErgoHeapSizeLimit
1495 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1496 }
1497 if (UseCompressedOops) {
1498 // Limit the heap size to the maximum possible when using compressed oops
1499 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1500 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1501 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1502 // but it should be not less than default MaxHeapSize.
1503 max_coop_heap -= HeapBaseMinAddress;
1504 }
1505 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1506 }
1507 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1508
1509 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1510 // An initial heap size was specified on the command line,
1511 // so be sure that the maximum size is consistent. Done
1512 // after call to allocatable_physical_memory because that
1513 // method might reduce the allocation size.
1514 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1515 }
1516
1517 if (PrintGCDetails && Verbose) {
1518 // Cannot use gclog_or_tty yet.
1519 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1520 }
1521 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1522 }
1523
1524 // If the initial_heap_size has not been set with InitialHeapSize
1525 // or -Xms, then set it as fraction of the size of physical memory,
1526 // respecting the maximum and minimum sizes of the heap.
1527 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1528 julong reasonable_minimum = (julong)(OldSize + NewSize);
1529
1530 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1531
1532 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1533
1534 julong reasonable_initial = phys_mem / InitialRAMFraction;
1535
1536 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1537 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1538
1539 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1540
1541 if (PrintGCDetails && Verbose) {
1542 // Cannot use gclog_or_tty yet.
1543 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1544 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1545 }
1546 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1547 set_min_heap_size((uintx)reasonable_minimum);
1548 }
1549 }
1550
1551 // This must be called after ergonomics because we want bytecode rewriting
1552 // if the server compiler is used, or if UseSharedSpaces is disabled.
1553 void Arguments::set_bytecode_flags() {
1554 // Better not attempt to store into a read-only space.
1555 if (UseSharedSpaces) {
1556 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1557 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1558 }
1559
1560 if (!RewriteBytecodes) {
1561 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1562 }
1563 }
1564
1565 // Aggressive optimization flags -XX:+AggressiveOpts
1566 void Arguments::set_aggressive_opts_flags() {
1567 #ifdef COMPILER2
1568 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1569 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1570 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1571 }
1572 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1573 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1574 }
1575
1576 // Feed the cache size setting into the JDK
1577 char buffer[1024];
1578 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1579 add_property(buffer);
1580 }
1581 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) {
1582 FLAG_SET_DEFAULT(DoEscapeAnalysis, true);
1583 }
1584 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1585 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1586 }
1587 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) {
1588 FLAG_SET_DEFAULT(OptimizeStringConcat, true);
1589 }
1590 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeFill)) {
1591 FLAG_SET_DEFAULT(OptimizeFill, true);
1592 }
1593 #endif
1594
1595 if (AggressiveOpts) {
1596 // Sample flag setting code
1597 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1598 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1599 // }
1600 }
1601 }
1602
1603 //===========================================================================================================
1604 // Parsing of java.compiler property
1605
1606 void Arguments::process_java_compiler_argument(char* arg) {
1607 // For backwards compatibility, Djava.compiler=NONE or ""
1608 // causes us to switch to -Xint mode UNLESS -Xdebug
1609 // is also specified.
1610 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1611 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1612 }
1613 }
1614
1615 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1616 _sun_java_launcher = strdup(launcher);
1617 if (strcmp("gamma", _sun_java_launcher) == 0) {
1618 _created_by_gamma_launcher = true;
1619 }
1620 }
1621
1622 bool Arguments::created_by_java_launcher() {
1623 assert(_sun_java_launcher != NULL, "property must have value");
1624 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1625 }
1626
1627 bool Arguments::created_by_gamma_launcher() {
1628 return _created_by_gamma_launcher;
1629 }
1630
1631 //===========================================================================================================
1632 // Parsing of main arguments
1633
1634 bool Arguments::verify_interval(uintx val, uintx min,
1635 uintx max, const char* name) {
1636 // Returns true iff value is in the inclusive interval [min..max]
1637 // false, otherwise.
1638 if (val >= min && val <= max) {
1639 return true;
1640 }
1641 jio_fprintf(defaultStream::error_stream(),
1642 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1643 " and " UINTX_FORMAT "\n",
1644 name, val, min, max);
1645 return false;
1646 }
1647
1648 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1649 // Returns true if given value is at least specified min threshold
1650 // false, otherwise.
1651 if (val >= min ) {
1652 return true;
1653 }
1654 jio_fprintf(defaultStream::error_stream(),
1655 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1656 name, val, min);
1657 return false;
1658 }
1659
1660 bool Arguments::verify_percentage(uintx value, const char* name) {
1661 if (value <= 100) {
1662 return true;
1663 }
1664 jio_fprintf(defaultStream::error_stream(),
1665 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1666 name, value);
1667 return false;
1668 }
1669
1670 static void force_serial_gc() {
1671 FLAG_SET_DEFAULT(UseSerialGC, true);
1672 FLAG_SET_DEFAULT(UseParNewGC, false);
1673 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1674 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1675 FLAG_SET_DEFAULT(UseParallelGC, false);
1676 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1677 FLAG_SET_DEFAULT(UseG1GC, false);
1678 }
1679
1680 static bool verify_serial_gc_flags() {
1681 return (UseSerialGC &&
1682 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1683 UseParallelGC || UseParallelOldGC));
1684 }
1685
1686 // check if do gclog rotation
1687 // +UseGCLogFileRotation is a must,
1688 // no gc log rotation when log file not supplied or
1689 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1690 void check_gclog_consistency() {
1691 if (UseGCLogFileRotation) {
1692 if ((Arguments::gc_log_filename() == NULL) ||
1693 (NumberOfGCLogFiles == 0) ||
1694 (GCLogFileSize == 0)) {
1695 jio_fprintf(defaultStream::output_stream(),
1696 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1697 "where num_of_file > 0 and num_of_size > 0\n"
1698 "GC log rotation is turned off\n");
1699 UseGCLogFileRotation = false;
1700 }
1701 }
1702
1703 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1704 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1705 jio_fprintf(defaultStream::output_stream(),
1706 "GCLogFileSize changed to minimum 8K\n");
1707 }
1708 }
1709
1710 // Check consistency of GC selection
1711 bool Arguments::check_gc_consistency() {
1712 check_gclog_consistency();
1713 bool status = true;
1714 // Ensure that the user has not selected conflicting sets
1715 // of collectors. [Note: this check is merely a user convenience;
1716 // collectors over-ride each other so that only a non-conflicting
1717 // set is selected; however what the user gets is not what they
1718 // may have expected from the combination they asked for. It's
1719 // better to reduce user confusion by not allowing them to
1720 // select conflicting combinations.
1721 uint i = 0;
1722 if (UseSerialGC) i++;
1723 if (UseConcMarkSweepGC || UseParNewGC) i++;
1724 if (UseParallelGC || UseParallelOldGC) i++;
1725 if (UseG1GC) i++;
1726 if (i > 1) {
1727 jio_fprintf(defaultStream::error_stream(),
1728 "Conflicting collector combinations in option list; "
1729 "please refer to the release notes for the combinations "
1730 "allowed\n");
1731 status = false;
1732 }
1733
1734 return status;
1735 }
1736
1737 // Check stack pages settings
1738 bool Arguments::check_stack_pages()
1739 {
1740 bool status = true;
1741 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1742 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1743 // greater stack shadow pages can't generate instruction to bang stack
1744 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1745 return status;
1746 }
1747
1748 // Check the consistency of vm_init_args
1749 bool Arguments::check_vm_args_consistency() {
1750 // Method for adding checks for flag consistency.
1751 // The intent is to warn the user of all possible conflicts,
1752 // before returning an error.
1753 // Note: Needs platform-dependent factoring.
1754 bool status = true;
1755
1756 #if ( (defined(COMPILER2) && defined(SPARC)))
1757 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1758 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1759 // x86. Normally, VM_Version_init must be called from init_globals in
1760 // init.cpp, which is called by the initial java thread *after* arguments
1761 // have been parsed. VM_Version_init gets called twice on sparc.
1762 extern void VM_Version_init();
1763 VM_Version_init();
1764 if (!VM_Version::has_v9()) {
1765 jio_fprintf(defaultStream::error_stream(),
1766 "V8 Machine detected, Server requires V9\n");
1767 status = false;
1768 }
1769 #endif /* COMPILER2 && SPARC */
1770
1771 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1772 // builds so the cost of stack banging can be measured.
1773 #if (defined(PRODUCT) && defined(SOLARIS))
1774 if (!UseBoundThreads && !UseStackBanging) {
1775 jio_fprintf(defaultStream::error_stream(),
1776 "-UseStackBanging conflicts with -UseBoundThreads\n");
1777
1778 status = false;
1779 }
1780 #endif
1781
1782 if (TLABRefillWasteFraction == 0) {
1783 jio_fprintf(defaultStream::error_stream(),
1784 "TLABRefillWasteFraction should be a denominator, "
1785 "not " SIZE_FORMAT "\n",
1786 TLABRefillWasteFraction);
1787 status = false;
1788 }
1789
1790 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1791 "AdaptiveSizePolicyWeight");
1792 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1793 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1794 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1795 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1796
1797 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1798 jio_fprintf(defaultStream::error_stream(),
1799 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1800 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1801 MinHeapFreeRatio, MaxHeapFreeRatio);
1802 status = false;
1803 }
1804 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1805 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1806
1807 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1808 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1809 }
1810
1811 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1812 // Settings to encourage splitting.
1813 if (!FLAG_IS_CMDLINE(NewRatio)) {
1814 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1815 }
1816 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1817 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1818 }
1819 }
1820
1821 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1822 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1823 if (GCTimeLimit == 100) {
1824 // Turn off gc-overhead-limit-exceeded checks
1825 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1826 }
1827
1828 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1829
1830 status = status && check_gc_consistency();
1831 status = status && check_stack_pages();
1832
1833 if (_has_alloc_profile) {
1834 if (UseParallelGC || UseParallelOldGC) {
1835 jio_fprintf(defaultStream::error_stream(),
1836 "error: invalid argument combination.\n"
1837 "Allocation profiling (-Xaprof) cannot be used together with "
1838 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1839 status = false;
1840 }
1841 if (UseConcMarkSweepGC) {
1842 jio_fprintf(defaultStream::error_stream(),
1843 "error: invalid argument combination.\n"
1844 "Allocation profiling (-Xaprof) cannot be used together with "
1845 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1846 status = false;
1847 }
1848 }
1849
1850 if (CMSIncrementalMode) {
1851 if (!UseConcMarkSweepGC) {
1852 jio_fprintf(defaultStream::error_stream(),
1853 "error: invalid argument combination.\n"
1854 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1855 "selected in order\nto use CMSIncrementalMode.\n");
1856 status = false;
1857 } else {
1858 status = status && verify_percentage(CMSIncrementalDutyCycle,
1859 "CMSIncrementalDutyCycle");
1860 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1861 "CMSIncrementalDutyCycleMin");
1862 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1863 "CMSIncrementalSafetyFactor");
1864 status = status && verify_percentage(CMSIncrementalOffset,
1865 "CMSIncrementalOffset");
1866 status = status && verify_percentage(CMSExpAvgFactor,
1867 "CMSExpAvgFactor");
1868 // If it was not set on the command line, set
1869 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1870 if (CMSInitiatingOccupancyFraction < 0) {
1871 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1872 }
1873 }
1874 }
1875
1876 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1877 // insists that we hold the requisite locks so that the iteration is
1878 // MT-safe. For the verification at start-up and shut-down, we don't
1879 // yet have a good way of acquiring and releasing these locks,
1880 // which are not visible at the CollectedHeap level. We want to
1881 // be able to acquire these locks and then do the iteration rather
1882 // than just disable the lock verification. This will be fixed under
1883 // bug 4788986.
1884 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1885 if (VerifyGCStartAt == 0) {
1886 warning("Heap verification at start-up disabled "
1887 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1888 VerifyGCStartAt = 1; // Disable verification at start-up
1889 }
1890 if (VerifyBeforeExit) {
1891 warning("Heap verification at shutdown disabled "
1892 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1893 VerifyBeforeExit = false; // Disable verification at shutdown
1894 }
1895 }
1896
1897 // Note: only executed in non-PRODUCT mode
1898 if (!UseAsyncConcMarkSweepGC &&
1899 (ExplicitGCInvokesConcurrent ||
1900 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1901 jio_fprintf(defaultStream::error_stream(),
1902 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1903 " with -UseAsyncConcMarkSweepGC");
1904 status = false;
1905 }
1906
1907 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
1908
1909 #ifndef SERIALGC
1910 if (UseG1GC) {
1911 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1912 "InitiatingHeapOccupancyPercent");
1913 status = status && verify_min_value(G1RefProcDrainInterval, 1,
1914 "G1RefProcDrainInterval");
1915 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
1916 "G1ConcMarkStepDurationMillis");
1917 }
1918 #endif
1919
1920 status = status && verify_interval(RefDiscoveryPolicy,
1921 ReferenceProcessor::DiscoveryPolicyMin,
1922 ReferenceProcessor::DiscoveryPolicyMax,
1923 "RefDiscoveryPolicy");
1924
1925 // Limit the lower bound of this flag to 1 as it is used in a division
1926 // expression.
1927 status = status && verify_interval(TLABWasteTargetPercent,
1928 1, 100, "TLABWasteTargetPercent");
1929
1930 status = status && verify_object_alignment();
1931
1932 return status;
1933 }
1934
1935 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1936 const char* option_type) {
1937 if (ignore) return false;
1938
1939 const char* spacer = " ";
1940 if (option_type == NULL) {
1941 option_type = ++spacer; // Set both to the empty string.
1942 }
1943
1944 if (os::obsolete_option(option)) {
1945 jio_fprintf(defaultStream::error_stream(),
1946 "Obsolete %s%soption: %s\n", option_type, spacer,
1947 option->optionString);
1948 return false;
1949 } else {
1950 jio_fprintf(defaultStream::error_stream(),
1951 "Unrecognized %s%soption: %s\n", option_type, spacer,
1952 option->optionString);
1953 return true;
1954 }
1955 }
1956
1957 static const char* user_assertion_options[] = {
1958 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1959 };
1960
1961 static const char* system_assertion_options[] = {
1962 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1963 };
1964
1965 // Return true if any of the strings in null-terminated array 'names' matches.
1966 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1967 // the option must match exactly.
1968 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1969 bool tail_allowed) {
1970 for (/* empty */; *names != NULL; ++names) {
1971 if (match_option(option, *names, tail)) {
1972 if (**tail == '\0' || tail_allowed && **tail == ':') {
1973 return true;
1974 }
1975 }
1976 }
1977 return false;
1978 }
1979
1980 bool Arguments::parse_uintx(const char* value,
1981 uintx* uintx_arg,
1982 uintx min_size) {
1983
1984 // Check the sign first since atomull() parses only unsigned values.
1985 bool value_is_positive = !(*value == '-');
1986
1987 if (value_is_positive) {
1988 julong n;
1989 bool good_return = atomull(value, &n);
1990 if (good_return) {
1991 bool above_minimum = n >= min_size;
1992 bool value_is_too_large = n > max_uintx;
1993
1994 if (above_minimum && !value_is_too_large) {
1995 *uintx_arg = n;
1996 return true;
1997 }
1998 }
1999 }
2000 return false;
2001 }
2002
2003 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2004 julong* long_arg,
2005 julong min_size) {
2006 if (!atomull(s, long_arg)) return arg_unreadable;
2007 return check_memory_size(*long_arg, min_size);
2008 }
2009
2010 // Parse JavaVMInitArgs structure
2011
2012 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2013 // For components of the system classpath.
2014 SysClassPath scp(Arguments::get_sysclasspath());
2015 bool scp_assembly_required = false;
2016
2017 // Save default settings for some mode flags
2018 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2019 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2020 Arguments::_ClipInlining = ClipInlining;
2021 Arguments::_BackgroundCompilation = BackgroundCompilation;
2022
2023 // Setup flags for mixed which is the default
2024 set_mode_flags(_mixed);
2025
2026 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2027 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2028 if (result != JNI_OK) {
2029 return result;
2030 }
2031
2032 // Parse JavaVMInitArgs structure passed in
2033 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2034 if (result != JNI_OK) {
2035 return result;
2036 }
2037
2038 if (AggressiveOpts) {
2039 // Insert alt-rt.jar between user-specified bootclasspath
2040 // prefix and the default bootclasspath. os::set_boot_path()
2041 // uses meta_index_dir as the default bootclasspath directory.
2042 const char* altclasses_jar = "alt-rt.jar";
2043 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2044 strlen(altclasses_jar);
2045 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
2046 strcpy(altclasses_path, get_meta_index_dir());
2047 strcat(altclasses_path, altclasses_jar);
2048 scp.add_suffix_to_prefix(altclasses_path);
2049 scp_assembly_required = true;
2050 FREE_C_HEAP_ARRAY(char, altclasses_path);
2051 }
2052
2053 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2054 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2055 if (result != JNI_OK) {
2056 return result;
2057 }
2058
2059 // Do final processing now that all arguments have been parsed
2060 result = finalize_vm_init_args(&scp, scp_assembly_required);
2061 if (result != JNI_OK) {
2062 return result;
2063 }
2064
2065 return JNI_OK;
2066 }
2067
2068 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2069 SysClassPath* scp_p,
2070 bool* scp_assembly_required_p,
2071 FlagValueOrigin origin) {
2072 // Remaining part of option string
2073 const char* tail;
2074
2075 // iterate over arguments
2076 for (int index = 0; index < args->nOptions; index++) {
2077 bool is_absolute_path = false; // for -agentpath vs -agentlib
2078
2079 const JavaVMOption* option = args->options + index;
2080
2081 if (!match_option(option, "-Djava.class.path", &tail) &&
2082 !match_option(option, "-Dsun.java.command", &tail) &&
2083 !match_option(option, "-Dsun.java.launcher", &tail)) {
2084
2085 // add all jvm options to the jvm_args string. This string
2086 // is used later to set the java.vm.args PerfData string constant.
2087 // the -Djava.class.path and the -Dsun.java.command options are
2088 // omitted from jvm_args string as each have their own PerfData
2089 // string constant object.
2090 build_jvm_args(option->optionString);
2091 }
2092
2093 // -verbose:[class/gc/jni]
2094 if (match_option(option, "-verbose", &tail)) {
2095 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2096 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2097 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2098 } else if (!strcmp(tail, ":gc")) {
2099 FLAG_SET_CMDLINE(bool, PrintGC, true);
2100 } else if (!strcmp(tail, ":jni")) {
2101 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2102 }
2103 // -da / -ea / -disableassertions / -enableassertions
2104 // These accept an optional class/package name separated by a colon, e.g.,
2105 // -da:java.lang.Thread.
2106 } else if (match_option(option, user_assertion_options, &tail, true)) {
2107 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2108 if (*tail == '\0') {
2109 JavaAssertions::setUserClassDefault(enable);
2110 } else {
2111 assert(*tail == ':', "bogus match by match_option()");
2112 JavaAssertions::addOption(tail + 1, enable);
2113 }
2114 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2115 } else if (match_option(option, system_assertion_options, &tail, false)) {
2116 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2117 JavaAssertions::setSystemClassDefault(enable);
2118 // -bootclasspath:
2119 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2120 scp_p->reset_path(tail);
2121 *scp_assembly_required_p = true;
2122 // -bootclasspath/a:
2123 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2124 scp_p->add_suffix(tail);
2125 *scp_assembly_required_p = true;
2126 // -bootclasspath/p:
2127 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2128 scp_p->add_prefix(tail);
2129 *scp_assembly_required_p = true;
2130 // -Xrun
2131 } else if (match_option(option, "-Xrun", &tail)) {
2132 if (tail != NULL) {
2133 const char* pos = strchr(tail, ':');
2134 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2135 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2136 name[len] = '\0';
2137
2138 char *options = NULL;
2139 if(pos != NULL) {
2140 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2141 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2142 }
2143 #ifdef JVMTI_KERNEL
2144 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2145 warning("profiling and debugging agents are not supported with Kernel VM");
2146 } else
2147 #endif // JVMTI_KERNEL
2148 add_init_library(name, options);
2149 }
2150 // -agentlib and -agentpath
2151 } else if (match_option(option, "-agentlib:", &tail) ||
2152 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2153 if(tail != NULL) {
2154 const char* pos = strchr(tail, '=');
2155 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2156 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2157 name[len] = '\0';
2158
2159 char *options = NULL;
2160 if(pos != NULL) {
2161 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2162 }
2163 #ifdef JVMTI_KERNEL
2164 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2165 warning("profiling and debugging agents are not supported with Kernel VM");
2166 } else
2167 #endif // JVMTI_KERNEL
2168 add_init_agent(name, options, is_absolute_path);
2169
2170 }
2171 // -javaagent
2172 } else if (match_option(option, "-javaagent:", &tail)) {
2173 if(tail != NULL) {
2174 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2175 add_init_agent("instrument", options, false);
2176 }
2177 // -Xnoclassgc
2178 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2179 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2180 // -Xincgc: i-CMS
2181 } else if (match_option(option, "-Xincgc", &tail)) {
2182 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2183 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2184 // -Xnoincgc: no i-CMS
2185 } else if (match_option(option, "-Xnoincgc", &tail)) {
2186 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2187 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2188 // -Xconcgc
2189 } else if (match_option(option, "-Xconcgc", &tail)) {
2190 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2191 // -Xnoconcgc
2192 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2193 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2194 // -Xbatch
2195 } else if (match_option(option, "-Xbatch", &tail)) {
2196 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2197 // -Xmn for compatibility with other JVM vendors
2198 } else if (match_option(option, "-Xmn", &tail)) {
2199 julong long_initial_eden_size = 0;
2200 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2201 if (errcode != arg_in_range) {
2202 jio_fprintf(defaultStream::error_stream(),
2203 "Invalid initial eden size: %s\n", option->optionString);
2204 describe_range_error(errcode);
2205 return JNI_EINVAL;
2206 }
2207 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2208 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2209 // -Xms
2210 } else if (match_option(option, "-Xms", &tail)) {
2211 julong long_initial_heap_size = 0;
2212 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2213 if (errcode != arg_in_range) {
2214 jio_fprintf(defaultStream::error_stream(),
2215 "Invalid initial heap size: %s\n", option->optionString);
2216 describe_range_error(errcode);
2217 return JNI_EINVAL;
2218 }
2219 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2220 // Currently the minimum size and the initial heap sizes are the same.
2221 set_min_heap_size(InitialHeapSize);
2222 // -Xmx
2223 } else if (match_option(option, "-Xmx", &tail)) {
2224 julong long_max_heap_size = 0;
2225 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2226 if (errcode != arg_in_range) {
2227 jio_fprintf(defaultStream::error_stream(),
2228 "Invalid maximum heap size: %s\n", option->optionString);
2229 describe_range_error(errcode);
2230 return JNI_EINVAL;
2231 }
2232 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2233 // Xmaxf
2234 } else if (match_option(option, "-Xmaxf", &tail)) {
2235 int maxf = (int)(atof(tail) * 100);
2236 if (maxf < 0 || maxf > 100) {
2237 jio_fprintf(defaultStream::error_stream(),
2238 "Bad max heap free percentage size: %s\n",
2239 option->optionString);
2240 return JNI_EINVAL;
2241 } else {
2242 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2243 }
2244 // Xminf
2245 } else if (match_option(option, "-Xminf", &tail)) {
2246 int minf = (int)(atof(tail) * 100);
2247 if (minf < 0 || minf > 100) {
2248 jio_fprintf(defaultStream::error_stream(),
2249 "Bad min heap free percentage size: %s\n",
2250 option->optionString);
2251 return JNI_EINVAL;
2252 } else {
2253 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2254 }
2255 // -Xss
2256 } else if (match_option(option, "-Xss", &tail)) {
2257 julong long_ThreadStackSize = 0;
2258 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2259 if (errcode != arg_in_range) {
2260 jio_fprintf(defaultStream::error_stream(),
2261 "Invalid thread stack size: %s\n", option->optionString);
2262 describe_range_error(errcode);
2263 return JNI_EINVAL;
2264 }
2265 // Internally track ThreadStackSize in units of 1024 bytes.
2266 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2267 round_to((int)long_ThreadStackSize, K) / K);
2268 // -Xoss
2269 } else if (match_option(option, "-Xoss", &tail)) {
2270 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2271 // -Xmaxjitcodesize
2272 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2273 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2274 julong long_ReservedCodeCacheSize = 0;
2275 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2276 (size_t)InitialCodeCacheSize);
2277 if (errcode != arg_in_range) {
2278 jio_fprintf(defaultStream::error_stream(),
2279 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2280 option->optionString, InitialCodeCacheSize/K);
2281 describe_range_error(errcode);
2282 return JNI_EINVAL;
2283 }
2284 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2285 // -green
2286 } else if (match_option(option, "-green", &tail)) {
2287 jio_fprintf(defaultStream::error_stream(),
2288 "Green threads support not available\n");
2289 return JNI_EINVAL;
2290 // -native
2291 } else if (match_option(option, "-native", &tail)) {
2292 // HotSpot always uses native threads, ignore silently for compatibility
2293 // -Xsqnopause
2294 } else if (match_option(option, "-Xsqnopause", &tail)) {
2295 // EVM option, ignore silently for compatibility
2296 // -Xrs
2297 } else if (match_option(option, "-Xrs", &tail)) {
2298 // Classic/EVM option, new functionality
2299 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2300 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2301 // change default internal VM signals used - lower case for back compat
2302 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2303 // -Xoptimize
2304 } else if (match_option(option, "-Xoptimize", &tail)) {
2305 // EVM option, ignore silently for compatibility
2306 // -Xprof
2307 } else if (match_option(option, "-Xprof", &tail)) {
2308 #ifndef FPROF_KERNEL
2309 _has_profile = true;
2310 #else // FPROF_KERNEL
2311 // do we have to exit?
2312 warning("Kernel VM does not support flat profiling.");
2313 #endif // FPROF_KERNEL
2314 // -Xaprof
2315 } else if (match_option(option, "-Xaprof", &tail)) {
2316 _has_alloc_profile = true;
2317 // -Xconcurrentio
2318 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2319 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2320 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2321 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2322 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2323 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2324
2325 // -Xinternalversion
2326 } else if (match_option(option, "-Xinternalversion", &tail)) {
2327 jio_fprintf(defaultStream::output_stream(), "%s\n",
2328 VM_Version::internal_vm_info_string());
2329 vm_exit(0);
2330 #ifndef PRODUCT
2331 // -Xprintflags
2332 } else if (match_option(option, "-Xprintflags", &tail)) {
2333 CommandLineFlags::printFlags();
2334 vm_exit(0);
2335 #endif
2336 // -D
2337 } else if (match_option(option, "-D", &tail)) {
2338 if (!add_property(tail)) {
2339 return JNI_ENOMEM;
2340 }
2341 // Out of the box management support
2342 if (match_option(option, "-Dcom.sun.management", &tail)) {
2343 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2344 }
2345 // -Xint
2346 } else if (match_option(option, "-Xint", &tail)) {
2347 set_mode_flags(_int);
2348 // -Xmixed
2349 } else if (match_option(option, "-Xmixed", &tail)) {
2350 set_mode_flags(_mixed);
2351 // -Xcomp
2352 } else if (match_option(option, "-Xcomp", &tail)) {
2353 // for testing the compiler; turn off all flags that inhibit compilation
2354 set_mode_flags(_comp);
2355
2356 // -Xshare:dump
2357 } else if (match_option(option, "-Xshare:dump", &tail)) {
2358 #ifdef TIERED
2359 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2360 set_mode_flags(_int); // Prevent compilation, which creates objects
2361 #elif defined(COMPILER2)
2362 vm_exit_during_initialization(
2363 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2364 #elif defined(KERNEL)
2365 vm_exit_during_initialization(
2366 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2367 #else
2368 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2369 set_mode_flags(_int); // Prevent compilation, which creates objects
2370 #endif
2371 // -Xshare:on
2372 } else if (match_option(option, "-Xshare:on", &tail)) {
2373 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2374 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2375 // -Xshare:auto
2376 } else if (match_option(option, "-Xshare:auto", &tail)) {
2377 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2378 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2379 // -Xshare:off
2380 } else if (match_option(option, "-Xshare:off", &tail)) {
2381 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2382 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2383
2384 // -Xverify
2385 } else if (match_option(option, "-Xverify", &tail)) {
2386 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2387 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2388 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2389 } else if (strcmp(tail, ":remote") == 0) {
2390 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2391 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2392 } else if (strcmp(tail, ":none") == 0) {
2393 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2394 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2395 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2396 return JNI_EINVAL;
2397 }
2398 // -Xdebug
2399 } else if (match_option(option, "-Xdebug", &tail)) {
2400 // note this flag has been used, then ignore
2401 set_xdebug_mode(true);
2402 // -Xnoagent
2403 } else if (match_option(option, "-Xnoagent", &tail)) {
2404 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2405 } else if (match_option(option, "-Xboundthreads", &tail)) {
2406 // Bind user level threads to kernel threads (Solaris only)
2407 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2408 } else if (match_option(option, "-Xloggc:", &tail)) {
2409 // Redirect GC output to the file. -Xloggc:<filename>
2410 // ostream_init_log(), when called will use this filename
2411 // to initialize a fileStream.
2412 _gc_log_filename = strdup(tail);
2413 FLAG_SET_CMDLINE(bool, PrintGC, true);
2414 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2415
2416 // JNI hooks
2417 } else if (match_option(option, "-Xcheck", &tail)) {
2418 if (!strcmp(tail, ":jni")) {
2419 CheckJNICalls = true;
2420 } else if (is_bad_option(option, args->ignoreUnrecognized,
2421 "check")) {
2422 return JNI_EINVAL;
2423 }
2424 } else if (match_option(option, "vfprintf", &tail)) {
2425 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2426 } else if (match_option(option, "exit", &tail)) {
2427 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2428 } else if (match_option(option, "abort", &tail)) {
2429 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2430 // -XX:+AggressiveHeap
2431 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2432
2433 // This option inspects the machine and attempts to set various
2434 // parameters to be optimal for long-running, memory allocation
2435 // intensive jobs. It is intended for machines with large
2436 // amounts of cpu and memory.
2437
2438 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2439 // VM, but we may not be able to represent the total physical memory
2440 // available (like having 8gb of memory on a box but using a 32bit VM).
2441 // Thus, we need to make sure we're using a julong for intermediate
2442 // calculations.
2443 julong initHeapSize;
2444 julong total_memory = os::physical_memory();
2445
2446 if (total_memory < (julong)256*M) {
2447 jio_fprintf(defaultStream::error_stream(),
2448 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2449 vm_exit(1);
2450 }
2451
2452 // The heap size is half of available memory, or (at most)
2453 // all of possible memory less 160mb (leaving room for the OS
2454 // when using ISM). This is the maximum; because adaptive sizing
2455 // is turned on below, the actual space used may be smaller.
2456
2457 initHeapSize = MIN2(total_memory / (julong)2,
2458 total_memory - (julong)160*M);
2459
2460 // Make sure that if we have a lot of memory we cap the 32 bit
2461 // process space. The 64bit VM version of this function is a nop.
2462 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2463
2464 // The perm gen is separate but contiguous with the
2465 // object heap (and is reserved with it) so subtract it
2466 // from the heap size.
2467 if (initHeapSize > MaxPermSize) {
2468 initHeapSize = initHeapSize - MaxPermSize;
2469 } else {
2470 warning("AggressiveHeap and MaxPermSize values may conflict");
2471 }
2472
2473 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2474 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2475 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2476 // Currently the minimum size and the initial heap sizes are the same.
2477 set_min_heap_size(initHeapSize);
2478 }
2479 if (FLAG_IS_DEFAULT(NewSize)) {
2480 // Make the young generation 3/8ths of the total heap.
2481 FLAG_SET_CMDLINE(uintx, NewSize,
2482 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2483 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2484 }
2485
2486 FLAG_SET_DEFAULT(UseLargePages, true);
2487
2488 // Increase some data structure sizes for efficiency
2489 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2490 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2491 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2492
2493 // See the OldPLABSize comment below, but replace 'after promotion'
2494 // with 'after copying'. YoungPLABSize is the size of the survivor
2495 // space per-gc-thread buffers. The default is 4kw.
2496 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2497
2498 // OldPLABSize is the size of the buffers in the old gen that
2499 // UseParallelGC uses to promote live data that doesn't fit in the
2500 // survivor spaces. At any given time, there's one for each gc thread.
2501 // The default size is 1kw. These buffers are rarely used, since the
2502 // survivor spaces are usually big enough. For specjbb, however, there
2503 // are occasions when there's lots of live data in the young gen
2504 // and we end up promoting some of it. We don't have a definite
2505 // explanation for why bumping OldPLABSize helps, but the theory
2506 // is that a bigger PLAB results in retaining something like the
2507 // original allocation order after promotion, which improves mutator
2508 // locality. A minor effect may be that larger PLABs reduce the
2509 // number of PLAB allocation events during gc. The value of 8kw
2510 // was arrived at by experimenting with specjbb.
2511 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2512
2513 // CompilationPolicyChoice=0 causes the server compiler to adopt
2514 // a more conservative which-method-do-I-compile policy when one
2515 // of the counters maintained by the interpreter trips. The
2516 // result is reduced startup time and improved specjbb and
2517 // alacrity performance. Zero is the default, but we set it
2518 // explicitly here in case the default changes.
2519 // See runtime/compilationPolicy.*.
2520 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0);
2521
2522 // Enable parallel GC and adaptive generation sizing
2523 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2524 FLAG_SET_DEFAULT(ParallelGCThreads,
2525 Abstract_VM_Version::parallel_worker_threads());
2526
2527 // Encourage steady state memory management
2528 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2529
2530 // This appears to improve mutator locality
2531 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2532
2533 // Get around early Solaris scheduling bug
2534 // (affinity vs other jobs on system)
2535 // but disallow DR and offlining (5008695).
2536 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2537
2538 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2539 // The last option must always win.
2540 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2541 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2542 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2543 // The last option must always win.
2544 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2545 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2546 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2547 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2548 jio_fprintf(defaultStream::error_stream(),
2549 "Please use CMSClassUnloadingEnabled in place of "
2550 "CMSPermGenSweepingEnabled in the future\n");
2551 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2552 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2553 jio_fprintf(defaultStream::error_stream(),
2554 "Please use -XX:+UseGCOverheadLimit in place of "
2555 "-XX:+UseGCTimeLimit in the future\n");
2556 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2557 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2558 jio_fprintf(defaultStream::error_stream(),
2559 "Please use -XX:-UseGCOverheadLimit in place of "
2560 "-XX:-UseGCTimeLimit in the future\n");
2561 // The TLE options are for compatibility with 1.3 and will be
2562 // removed without notice in a future release. These options
2563 // are not to be documented.
2564 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2565 // No longer used.
2566 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2567 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2568 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2569 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2570 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2571 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2572 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2573 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2574 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2575 // No longer used.
2576 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2577 julong long_tlab_size = 0;
2578 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2579 if (errcode != arg_in_range) {
2580 jio_fprintf(defaultStream::error_stream(),
2581 "Invalid TLAB size: %s\n", option->optionString);
2582 describe_range_error(errcode);
2583 return JNI_EINVAL;
2584 }
2585 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2586 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2587 // No longer used.
2588 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2589 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2590 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2591 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2592 SOLARIS_ONLY(
2593 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2594 warning("-XX:+UsePermISM is obsolete.");
2595 FLAG_SET_CMDLINE(bool, UseISM, true);
2596 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2597 FLAG_SET_CMDLINE(bool, UseISM, false);
2598 )
2599 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2600 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2601 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2602 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2603 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2604 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2605 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2606 #ifdef SOLARIS
2607 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2608 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2609 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2610 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2611 #else // ndef SOLARIS
2612 jio_fprintf(defaultStream::error_stream(),
2613 "ExtendedDTraceProbes flag is only applicable on Solaris\n");
2614 return JNI_EINVAL;
2615 #endif // ndef SOLARIS
2616 #ifdef ASSERT
2617 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2618 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2619 // disable scavenge before parallel mark-compact
2620 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2621 #endif
2622 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2623 julong cms_blocks_to_claim = (julong)atol(tail);
2624 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2625 jio_fprintf(defaultStream::error_stream(),
2626 "Please use -XX:OldPLABSize in place of "
2627 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2628 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2629 julong cms_blocks_to_claim = (julong)atol(tail);
2630 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2631 jio_fprintf(defaultStream::error_stream(),
2632 "Please use -XX:OldPLABSize in place of "
2633 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2634 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2635 julong old_plab_size = 0;
2636 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2637 if (errcode != arg_in_range) {
2638 jio_fprintf(defaultStream::error_stream(),
2639 "Invalid old PLAB size: %s\n", option->optionString);
2640 describe_range_error(errcode);
2641 return JNI_EINVAL;
2642 }
2643 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2644 jio_fprintf(defaultStream::error_stream(),
2645 "Please use -XX:OldPLABSize in place of "
2646 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2647 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2648 julong young_plab_size = 0;
2649 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2650 if (errcode != arg_in_range) {
2651 jio_fprintf(defaultStream::error_stream(),
2652 "Invalid young PLAB size: %s\n", option->optionString);
2653 describe_range_error(errcode);
2654 return JNI_EINVAL;
2655 }
2656 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2657 jio_fprintf(defaultStream::error_stream(),
2658 "Please use -XX:YoungPLABSize in place of "
2659 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2660 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2661 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2662 julong stack_size = 0;
2663 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2664 if (errcode != arg_in_range) {
2665 jio_fprintf(defaultStream::error_stream(),
2666 "Invalid mark stack size: %s\n", option->optionString);
2667 describe_range_error(errcode);
2668 return JNI_EINVAL;
2669 }
2670 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2671 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2672 julong max_stack_size = 0;
2673 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2674 if (errcode != arg_in_range) {
2675 jio_fprintf(defaultStream::error_stream(),
2676 "Invalid maximum mark stack size: %s\n",
2677 option->optionString);
2678 describe_range_error(errcode);
2679 return JNI_EINVAL;
2680 }
2681 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2682 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2683 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2684 uintx conc_threads = 0;
2685 if (!parse_uintx(tail, &conc_threads, 1)) {
2686 jio_fprintf(defaultStream::error_stream(),
2687 "Invalid concurrent threads: %s\n", option->optionString);
2688 return JNI_EINVAL;
2689 }
2690 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2691 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2692 // Skip -XX:Flags= since that case has already been handled
2693 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2694 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2695 return JNI_EINVAL;
2696 }
2697 }
2698 // Unknown option
2699 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2700 return JNI_ERR;
2701 }
2702 }
2703
2704 // Change the default value for flags which have different default values
2705 // when working with older JDKs.
2706 if (JDK_Version::current().compare_major(6) <= 0 &&
2707 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2708 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2709 }
2710 #ifdef LINUX
2711 if (JDK_Version::current().compare_major(6) <= 0 &&
2712 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2713 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2714 }
2715 #endif // LINUX
2716 return JNI_OK;
2717 }
2718
2719 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2720 // This must be done after all -D arguments have been processed.
2721 scp_p->expand_endorsed();
2722
2723 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2724 // Assemble the bootclasspath elements into the final path.
2725 Arguments::set_sysclasspath(scp_p->combined_path());
2726 }
2727
2728 // This must be done after all arguments have been processed.
2729 // java_compiler() true means set to "NONE" or empty.
2730 if (java_compiler() && !xdebug_mode()) {
2731 // For backwards compatibility, we switch to interpreted mode if
2732 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2733 // not specified.
2734 set_mode_flags(_int);
2735 }
2736 if (CompileThreshold == 0) {
2737 set_mode_flags(_int);
2738 }
2739
2740 #ifndef COMPILER2
2741 // Don't degrade server performance for footprint
2742 if (FLAG_IS_DEFAULT(UseLargePages) &&
2743 MaxHeapSize < LargePageHeapSizeThreshold) {
2744 // No need for large granularity pages w/small heaps.
2745 // Note that large pages are enabled/disabled for both the
2746 // Java heap and the code cache.
2747 FLAG_SET_DEFAULT(UseLargePages, false);
2748 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2749 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2750 }
2751
2752 // Tiered compilation is undefined with C1.
2753 TieredCompilation = false;
2754 #else
2755 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2756 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2757 }
2758 #endif
2759
2760 // If we are running in a headless jre, force java.awt.headless property
2761 // to be true unless the property has already been set.
2762 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2763 if (os::is_headless_jre()) {
2764 const char* headless = Arguments::get_property("java.awt.headless");
2765 if (headless == NULL) {
2766 char envbuffer[128];
2767 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2768 if (!add_property("java.awt.headless=true")) {
2769 return JNI_ENOMEM;
2770 }
2771 } else {
2772 char buffer[256];
2773 strcpy(buffer, "java.awt.headless=");
2774 strcat(buffer, envbuffer);
2775 if (!add_property(buffer)) {
2776 return JNI_ENOMEM;
2777 }
2778 }
2779 }
2780 }
2781
2782 if (!check_vm_args_consistency()) {
2783 return JNI_ERR;
2784 }
2785
2786 return JNI_OK;
2787 }
2788
2789 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2790 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2791 scp_assembly_required_p);
2792 }
2793
2794 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2795 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2796 scp_assembly_required_p);
2797 }
2798
2799 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2800 const int N_MAX_OPTIONS = 64;
2801 const int OPTION_BUFFER_SIZE = 1024;
2802 char buffer[OPTION_BUFFER_SIZE];
2803
2804 // The variable will be ignored if it exceeds the length of the buffer.
2805 // Don't check this variable if user has special privileges
2806 // (e.g. unix su command).
2807 if (os::getenv(name, buffer, sizeof(buffer)) &&
2808 !os::have_special_privileges()) {
2809 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2810 jio_fprintf(defaultStream::error_stream(),
2811 "Picked up %s: %s\n", name, buffer);
2812 char* rd = buffer; // pointer to the input string (rd)
2813 int i;
2814 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2815 while (isspace(*rd)) rd++; // skip whitespace
2816 if (*rd == 0) break; // we re done when the input string is read completely
2817
2818 // The output, option string, overwrites the input string.
2819 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2820 // input string (rd).
2821 char* wrt = rd;
2822
2823 options[i++].optionString = wrt; // Fill in option
2824 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2825 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2826 int quote = *rd; // matching quote to look for
2827 rd++; // don't copy open quote
2828 while (*rd != quote) { // include everything (even spaces) up until quote
2829 if (*rd == 0) { // string termination means unmatched string
2830 jio_fprintf(defaultStream::error_stream(),
2831 "Unmatched quote in %s\n", name);
2832 return JNI_ERR;
2833 }
2834 *wrt++ = *rd++; // copy to option string
2835 }
2836 rd++; // don't copy close quote
2837 } else {
2838 *wrt++ = *rd++; // copy to option string
2839 }
2840 }
2841 // Need to check if we're done before writing a NULL,
2842 // because the write could be to the byte that rd is pointing to.
2843 if (*rd++ == 0) {
2844 *wrt = 0;
2845 break;
2846 }
2847 *wrt = 0; // Zero terminate option
2848 }
2849 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2850 JavaVMInitArgs vm_args;
2851 vm_args.version = JNI_VERSION_1_2;
2852 vm_args.options = options;
2853 vm_args.nOptions = i;
2854 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2855
2856 if (PrintVMOptions) {
2857 const char* tail;
2858 for (int i = 0; i < vm_args.nOptions; i++) {
2859 const JavaVMOption *option = vm_args.options + i;
2860 if (match_option(option, "-XX:", &tail)) {
2861 logOption(tail);
2862 }
2863 }
2864 }
2865
2866 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2867 }
2868 return JNI_OK;
2869 }
2870
2871 void Arguments::set_shared_spaces_flags() {
2872 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
2873 const bool might_share = must_share || UseSharedSpaces;
2874
2875 // The string table is part of the shared archive so the size must match.
2876 if (!FLAG_IS_DEFAULT(StringTableSize)) {
2877 // Disable sharing.
2878 if (must_share) {
2879 warning("disabling shared archive %s because of non-default "
2880 "StringTableSize", DumpSharedSpaces ? "creation" : "use");
2881 }
2882 if (might_share) {
2883 FLAG_SET_DEFAULT(DumpSharedSpaces, false);
2884 FLAG_SET_DEFAULT(RequireSharedSpaces, false);
2885 FLAG_SET_DEFAULT(UseSharedSpaces, false);
2886 }
2887 return;
2888 }
2889
2890 // Check whether class data sharing settings conflict with GC, compressed oops
2891 // or page size, and fix them up. Explicit sharing options override other
2892 // settings.
2893 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
2894 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
2895 UseCompressedOops || UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
2896 if (cannot_share) {
2897 if (must_share) {
2898 warning("selecting serial gc and disabling large pages %s"
2899 "because of %s", "" LP64_ONLY("and compressed oops "),
2900 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
2901 force_serial_gc();
2902 FLAG_SET_CMDLINE(bool, UseLargePages, false);
2903 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
2904 } else {
2905 if (UseSharedSpaces && Verbose) {
2906 warning("turning off use of shared archive because of "
2907 "choice of garbage collector or large pages");
2908 }
2909 no_shared_spaces();
2910 }
2911 } else if (UseLargePages && might_share) {
2912 // Disable large pages to allow shared spaces. This is sub-optimal, since
2913 // there may not even be a shared archive to use.
2914 FLAG_SET_DEFAULT(UseLargePages, false);
2915 }
2916 }
2917
2918 // Disable options not supported in this release, with a warning if they
2919 // were explicitly requested on the command-line
2920 #define UNSUPPORTED_OPTION(opt, description) \
2921 do { \
2922 if (opt) { \
2923 if (FLAG_IS_CMDLINE(opt)) { \
2924 warning(description " is disabled in this release."); \
2925 } \
2926 FLAG_SET_DEFAULT(opt, false); \
2927 } \
2928 } while(0)
2929
2930 // Parse entry point called from JNI_CreateJavaVM
2931
2932 jint Arguments::parse(const JavaVMInitArgs* args) {
2933
2934 // Sharing support
2935 // Construct the path to the archive
2936 char jvm_path[JVM_MAXPATHLEN];
2937 os::jvm_path(jvm_path, sizeof(jvm_path));
2938 #ifdef TIERED
2939 if (strstr(jvm_path, "client") != NULL) {
2940 force_client_mode = true;
2941 }
2942 #endif // TIERED
2943 char *end = strrchr(jvm_path, *os::file_separator());
2944 if (end != NULL) *end = '\0';
2945 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2946 strlen(os::file_separator()) + 20);
2947 if (shared_archive_path == NULL) return JNI_ENOMEM;
2948 strcpy(shared_archive_path, jvm_path);
2949 strcat(shared_archive_path, os::file_separator());
2950 strcat(shared_archive_path, "classes");
2951 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2952 strcat(shared_archive_path, ".jsa");
2953 SharedArchivePath = shared_archive_path;
2954
2955 // Remaining part of option string
2956 const char* tail;
2957
2958 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2959 bool settings_file_specified = false;
2960 const char* flags_file;
2961 int index;
2962 for (index = 0; index < args->nOptions; index++) {
2963 const JavaVMOption *option = args->options + index;
2964 if (match_option(option, "-XX:Flags=", &tail)) {
2965 flags_file = tail;
2966 settings_file_specified = true;
2967 }
2968 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2969 PrintVMOptions = true;
2970 }
2971 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2972 PrintVMOptions = false;
2973 }
2974 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2975 IgnoreUnrecognizedVMOptions = true;
2976 }
2977 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2978 IgnoreUnrecognizedVMOptions = false;
2979 }
2980 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2981 CommandLineFlags::printFlags();
2982 vm_exit(0);
2983 }
2984
2985 #ifndef PRODUCT
2986 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
2987 CommandLineFlags::printFlags(true);
2988 vm_exit(0);
2989 }
2990 #endif
2991 }
2992
2993 if (IgnoreUnrecognizedVMOptions) {
2994 // uncast const to modify the flag args->ignoreUnrecognized
2995 *(jboolean*)(&args->ignoreUnrecognized) = true;
2996 }
2997
2998 // Parse specified settings file
2999 if (settings_file_specified) {
3000 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3001 return JNI_EINVAL;
3002 }
3003 }
3004
3005 // Parse default .hotspotrc settings file
3006 if (!settings_file_specified) {
3007 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3008 return JNI_EINVAL;
3009 }
3010 }
3011
3012 if (PrintVMOptions) {
3013 for (index = 0; index < args->nOptions; index++) {
3014 const JavaVMOption *option = args->options + index;
3015 if (match_option(option, "-XX:", &tail)) {
3016 logOption(tail);
3017 }
3018 }
3019 }
3020
3021 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3022 jint result = parse_vm_init_args(args);
3023 if (result != JNI_OK) {
3024 return result;
3025 }
3026
3027 #ifdef JAVASE_EMBEDDED
3028 #ifdef PPC
3029 UNSUPPORTED_OPTION(EnableInvokeDynamic, "Invoke dynamic");
3030 #endif
3031 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3032 #endif
3033
3034 #ifndef PRODUCT
3035 if (TraceBytecodesAt != 0) {
3036 TraceBytecodes = true;
3037 }
3038 if (CountCompiledCalls) {
3039 if (UseCounterDecay) {
3040 warning("UseCounterDecay disabled because CountCalls is set");
3041 UseCounterDecay = false;
3042 }
3043 }
3044 #endif // PRODUCT
3045
3046 // Transitional
3047 if (EnableMethodHandles || AnonymousClasses) {
3048 if (!EnableInvokeDynamic && !FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3049 warning("EnableMethodHandles and AnonymousClasses are obsolete. Keeping EnableInvokeDynamic disabled.");
3050 } else {
3051 EnableInvokeDynamic = true;
3052 }
3053 }
3054
3055 // JSR 292 is not supported before 1.7
3056 if (!JDK_Version::is_gte_jdk17x_version()) {
3057 if (EnableInvokeDynamic) {
3058 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3059 warning("JSR 292 is not supported before 1.7. Disabling support.");
3060 }
3061 EnableInvokeDynamic = false;
3062 }
3063 }
3064
3065 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3066 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3067 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3068 }
3069 ScavengeRootsInCode = 1;
3070 }
3071 if (!JavaObjectsInPerm && ScavengeRootsInCode == 0) {
3072 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3073 warning("forcing ScavengeRootsInCode non-zero because JavaObjectsInPerm is false");
3074 }
3075 ScavengeRootsInCode = 1;
3076 }
3077
3078 if (PrintGCDetails) {
3079 // Turn on -verbose:gc options as well
3080 PrintGC = true;
3081 }
3082
3083 // Set object alignment values.
3084 set_object_alignment();
3085
3086 #ifdef SERIALGC
3087 force_serial_gc();
3088 #endif // SERIALGC
3089 #ifdef KERNEL
3090 no_shared_spaces();
3091 #endif // KERNEL
3092
3093 // Set flags based on ergonomics.
3094 set_ergonomics_flags();
3095
3096 set_shared_spaces_flags();
3097
3098 // Check the GC selections again.
3099 if (!check_gc_consistency()) {
3100 return JNI_EINVAL;
3101 }
3102
3103 if (TieredCompilation) {
3104 set_tiered_flags();
3105 } else {
3106 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3107 if (CompilationPolicyChoice >= 2) {
3108 vm_exit_during_initialization(
3109 "Incompatible compilation policy selected", NULL);
3110 }
3111 }
3112
3113 #ifndef KERNEL
3114 // Set heap size based on available physical memory
3115 set_heap_size();
3116 // Set per-collector flags
3117 if (UseParallelGC || UseParallelOldGC) {
3118 set_parallel_gc_flags();
3119 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3120 set_cms_and_parnew_gc_flags();
3121 } else if (UseParNewGC) { // skipped if CMS is set above
3122 set_parnew_gc_flags();
3123 } else if (UseG1GC) {
3124 set_g1_gc_flags();
3125 }
3126 #endif // KERNEL
3127
3128 #ifdef SERIALGC
3129 assert(verify_serial_gc_flags(), "SerialGC unset");
3130 #endif // SERIALGC
3131
3132 // Set bytecode rewriting flags
3133 set_bytecode_flags();
3134
3135 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3136 set_aggressive_opts_flags();
3137
3138 // Turn off biased locking for locking debug mode flags,
3139 // which are subtlely different from each other but neither works with
3140 // biased locking.
3141 if (UseHeavyMonitors
3142 #ifdef COMPILER1
3143 || !UseFastLocking
3144 #endif // COMPILER1
3145 ) {
3146 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3147 // flag set to true on command line; warn the user that they
3148 // can't enable biased locking here
3149 warning("Biased Locking is not supported with locking debug flags"
3150 "; ignoring UseBiasedLocking flag." );
3151 }
3152 UseBiasedLocking = false;
3153 }
3154
3155 #ifdef CC_INTERP
3156 // Clear flags not supported by the C++ interpreter
3157 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3158 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3159 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3160 #endif // CC_INTERP
3161
3162 #ifdef COMPILER2
3163 if (!UseBiasedLocking || EmitSync != 0) {
3164 UseOptoBiasInlining = false;
3165 }
3166 #endif
3167
3168 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3169 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3170 DebugNonSafepoints = true;
3171 }
3172
3173 #ifndef PRODUCT
3174 if (CompileTheWorld) {
3175 // Force NmethodSweeper to sweep whole CodeCache each time.
3176 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3177 NmethodSweepFraction = 1;
3178 }
3179 }
3180 #endif
3181
3182 if (PrintCommandLineFlags) {
3183 CommandLineFlags::printSetFlags();
3184 }
3185
3186 // Apply CPU specific policy for the BiasedLocking
3187 if (UseBiasedLocking) {
3188 if (!VM_Version::use_biased_locking() &&
3189 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3190 UseBiasedLocking = false;
3191 }
3192 }
3193
3194 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3195 // but only if not already set on the commandline
3196 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3197 bool set = false;
3198 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3199 if (!set) {
3200 FLAG_SET_DEFAULT(PauseAtExit, true);
3201 }
3202 }
3203
3204 return JNI_OK;
3205 }
3206
3207 int Arguments::PropertyList_count(SystemProperty* pl) {
3208 int count = 0;
3209 while(pl != NULL) {
3210 count++;
3211 pl = pl->next();
3212 }
3213 return count;
3214 }
3215
3216 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3217 assert(key != NULL, "just checking");
3218 SystemProperty* prop;
3219 for (prop = pl; prop != NULL; prop = prop->next()) {
3220 if (strcmp(key, prop->key()) == 0) return prop->value();
3221 }
3222 return NULL;
3223 }
3224
3225 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3226 int count = 0;
3227 const char* ret_val = NULL;
3228
3229 while(pl != NULL) {
3230 if(count >= index) {
3231 ret_val = pl->key();
3232 break;
3233 }
3234 count++;
3235 pl = pl->next();
3236 }
3237
3238 return ret_val;
3239 }
3240
3241 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3242 int count = 0;
3243 char* ret_val = NULL;
3244
3245 while(pl != NULL) {
3246 if(count >= index) {
3247 ret_val = pl->value();
3248 break;
3249 }
3250 count++;
3251 pl = pl->next();
3252 }
3253
3254 return ret_val;
3255 }
3256
3257 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3258 SystemProperty* p = *plist;
3259 if (p == NULL) {
3260 *plist = new_p;
3261 } else {
3262 while (p->next() != NULL) {
3263 p = p->next();
3264 }
3265 p->set_next(new_p);
3266 }
3267 }
3268
3269 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3270 if (plist == NULL)
3271 return;
3272
3273 SystemProperty* new_p = new SystemProperty(k, v, true);
3274 PropertyList_add(plist, new_p);
3275 }
3276
3277 // This add maintains unique property key in the list.
3278 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3279 if (plist == NULL)
3280 return;
3281
3282 // If property key exist then update with new value.
3283 SystemProperty* prop;
3284 for (prop = *plist; prop != NULL; prop = prop->next()) {
3285 if (strcmp(k, prop->key()) == 0) {
3286 if (append) {
3287 prop->append_value(v);
3288 } else {
3289 prop->set_value(v);
3290 }
3291 return;
3292 }
3293 }
3294
3295 PropertyList_add(plist, k, v);
3296 }
3297
3298 #ifdef KERNEL
3299 char *Arguments::get_kernel_properties() {
3300 // Find properties starting with kernel and append them to string
3301 // We need to find out how long they are first because the URL's that they
3302 // might point to could get long.
3303 int length = 0;
3304 SystemProperty* prop;
3305 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3306 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3307 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3308 }
3309 }
3310 // Add one for null terminator.
3311 char *props = AllocateHeap(length + 1, "get_kernel_properties");
3312 if (length != 0) {
3313 int pos = 0;
3314 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3315 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3316 jio_snprintf(&props[pos], length-pos,
3317 "-D%s=%s ", prop->key(), prop->value());
3318 pos = strlen(props);
3319 }
3320 }
3321 }
3322 // null terminate props in case of null
3323 props[length] = '\0';
3324 return props;
3325 }
3326 #endif // KERNEL
3327
3328 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3329 // Returns true if all of the source pointed by src has been copied over to
3330 // the destination buffer pointed by buf. Otherwise, returns false.
3331 // Notes:
3332 // 1. If the length (buflen) of the destination buffer excluding the
3333 // NULL terminator character is not long enough for holding the expanded
3334 // pid characters, it also returns false instead of returning the partially
3335 // expanded one.
3336 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3337 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3338 char* buf, size_t buflen) {
3339 const char* p = src;
3340 char* b = buf;
3341 const char* src_end = &src[srclen];
3342 char* buf_end = &buf[buflen - 1];
3343
3344 while (p < src_end && b < buf_end) {
3345 if (*p == '%') {
3346 switch (*(++p)) {
3347 case '%': // "%%" ==> "%"
3348 *b++ = *p++;
3349 break;
3350 case 'p': { // "%p" ==> current process id
3351 // buf_end points to the character before the last character so
3352 // that we could write '\0' to the end of the buffer.
3353 size_t buf_sz = buf_end - b + 1;
3354 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3355
3356 // if jio_snprintf fails or the buffer is not long enough to hold
3357 // the expanded pid, returns false.
3358 if (ret < 0 || ret >= (int)buf_sz) {
3359 return false;
3360 } else {
3361 b += ret;
3362 assert(*b == '\0', "fail in copy_expand_pid");
3363 if (p == src_end && b == buf_end + 1) {
3364 // reach the end of the buffer.
3365 return true;
3366 }
3367 }
3368 p++;
3369 break;
3370 }
3371 default :
3372 *b++ = '%';
3373 }
3374 } else {
3375 *b++ = *p++;
3376 }
3377 }
3378 *b = '\0';
3379 return (p == src_end); // return false if not all of the source was copied
3380 }