Mon, 18 Jun 2012 12:29:21 -0700
7176856: add the JRE name to the error log
Reviewed-by: coleenp, jrose, kvn, twisti
Contributed-by: Krystal Mok <sajia@taobao.com>
1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #include "precompiled.hpp"
26 #include "classfile/javaAssertions.hpp"
27 #include "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 #ifdef TARGET_OS_FAMILY_bsd
50 # include "os_bsd.inline.hpp"
51 #endif
52 #ifndef SERIALGC
53 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp"
54 #endif
56 // Note: This is a special bug reporting site for the JVM
57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp"
58 #define DEFAULT_JAVA_LAUNCHER "generic"
60 char** Arguments::_jvm_flags_array = NULL;
61 int Arguments::_num_jvm_flags = 0;
62 char** Arguments::_jvm_args_array = NULL;
63 int Arguments::_num_jvm_args = 0;
64 char* Arguments::_java_command = NULL;
65 SystemProperty* Arguments::_system_properties = NULL;
66 const char* Arguments::_gc_log_filename = NULL;
67 bool Arguments::_has_profile = false;
68 bool Arguments::_has_alloc_profile = false;
69 uintx Arguments::_min_heap_size = 0;
70 Arguments::Mode Arguments::_mode = _mixed;
71 bool Arguments::_java_compiler = false;
72 bool Arguments::_xdebug_mode = false;
73 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG;
74 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER;
75 int Arguments::_sun_java_launcher_pid = -1;
76 bool Arguments::_created_by_gamma_launcher = false;
78 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*)
79 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
80 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement;
81 bool Arguments::_BackgroundCompilation = BackgroundCompilation;
82 bool Arguments::_ClipInlining = ClipInlining;
84 char* Arguments::SharedArchivePath = NULL;
86 AgentLibraryList Arguments::_libraryList;
87 AgentLibraryList Arguments::_agentList;
89 abort_hook_t Arguments::_abort_hook = NULL;
90 exit_hook_t Arguments::_exit_hook = NULL;
91 vfprintf_hook_t Arguments::_vfprintf_hook = NULL;
94 SystemProperty *Arguments::_java_ext_dirs = NULL;
95 SystemProperty *Arguments::_java_endorsed_dirs = NULL;
96 SystemProperty *Arguments::_sun_boot_library_path = NULL;
97 SystemProperty *Arguments::_java_library_path = NULL;
98 SystemProperty *Arguments::_java_home = NULL;
99 SystemProperty *Arguments::_java_class_path = NULL;
100 SystemProperty *Arguments::_sun_boot_class_path = NULL;
102 char* Arguments::_meta_index_path = NULL;
103 char* Arguments::_meta_index_dir = NULL;
105 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string
107 static bool match_option(const JavaVMOption *option, const char* name,
108 const char** tail) {
109 int len = (int)strlen(name);
110 if (strncmp(option->optionString, name, len) == 0) {
111 *tail = option->optionString + len;
112 return true;
113 } else {
114 return false;
115 }
116 }
118 static void logOption(const char* opt) {
119 if (PrintVMOptions) {
120 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt);
121 }
122 }
124 // Process java launcher properties.
125 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) {
126 // See if sun.java.launcher or sun.java.launcher.pid is defined.
127 // Must do this before setting up other system properties,
128 // as some of them may depend on launcher type.
129 for (int index = 0; index < args->nOptions; index++) {
130 const JavaVMOption* option = args->options + index;
131 const char* tail;
133 if (match_option(option, "-Dsun.java.launcher=", &tail)) {
134 process_java_launcher_argument(tail, option->extraInfo);
135 continue;
136 }
137 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) {
138 _sun_java_launcher_pid = atoi(tail);
139 continue;
140 }
141 }
142 }
144 // Initialize system properties key and value.
145 void Arguments::init_system_properties() {
147 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name",
148 "Java Virtual Machine Specification", false));
149 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false));
150 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false));
151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true));
153 // following are JVMTI agent writeable properties.
154 // Properties values are set to NULL and they are
155 // os specific they are initialized in os::init_system_properties_values().
156 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true);
157 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true);
158 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true);
159 _java_library_path = new SystemProperty("java.library.path", NULL, true);
160 _java_home = new SystemProperty("java.home", NULL, true);
161 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true);
163 _java_class_path = new SystemProperty("java.class.path", "", true);
165 // Add to System Property list.
166 PropertyList_add(&_system_properties, _java_ext_dirs);
167 PropertyList_add(&_system_properties, _java_endorsed_dirs);
168 PropertyList_add(&_system_properties, _sun_boot_library_path);
169 PropertyList_add(&_system_properties, _java_library_path);
170 PropertyList_add(&_system_properties, _java_home);
171 PropertyList_add(&_system_properties, _java_class_path);
172 PropertyList_add(&_system_properties, _sun_boot_class_path);
174 // Set OS specific system properties values
175 os::init_system_properties_values();
176 }
179 // Update/Initialize System properties after JDK version number is known
180 void Arguments::init_version_specific_system_properties() {
181 enum { bufsz = 16 };
182 char buffer[bufsz];
183 const char* spec_vendor = "Sun Microsystems Inc.";
184 uint32_t spec_version = 0;
186 if (JDK_Version::is_gte_jdk17x_version()) {
187 spec_vendor = "Oracle Corporation";
188 spec_version = JDK_Version::current().major_version();
189 }
190 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version);
192 PropertyList_add(&_system_properties,
193 new SystemProperty("java.vm.specification.vendor", spec_vendor, false));
194 PropertyList_add(&_system_properties,
195 new SystemProperty("java.vm.specification.version", buffer, false));
196 PropertyList_add(&_system_properties,
197 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false));
198 }
200 /**
201 * Provide a slightly more user-friendly way of eliminating -XX flags.
202 * When a flag is eliminated, it can be added to this list in order to
203 * continue accepting this flag on the command-line, while issuing a warning
204 * and ignoring the value. Once the JDK version reaches the 'accept_until'
205 * limit, we flatly refuse to admit the existence of the flag. This allows
206 * a flag to die correctly over JDK releases using HSX.
207 */
208 typedef struct {
209 const char* name;
210 JDK_Version obsoleted_in; // when the flag went away
211 JDK_Version accept_until; // which version to start denying the existence
212 } ObsoleteFlag;
214 static ObsoleteFlag obsolete_jvm_flags[] = {
215 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) },
216 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
217 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) },
218 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) },
219 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) },
220 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) },
221 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) },
222 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
223 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
224 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) },
225 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) },
226 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) },
227 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) },
228 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) },
229 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
230 { "DefaultInitialRAMFraction",
231 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) },
232 { "UseDepthFirstScavengeOrder",
233 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) },
234 { "HandlePromotionFailure",
235 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
236 { "MaxLiveObjectEvacuationRatio",
237 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) },
238 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) },
239 { "UseParallelOldGCCompacting",
240 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
241 { "UseParallelDensePrefixUpdate",
242 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
243 { "UseParallelOldGCDensePrefix",
244 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) },
245 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) },
246 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) },
247 #ifdef PRODUCT
248 { "DesiredMethodLimit",
249 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },
250 #endif // PRODUCT
251 { NULL, JDK_Version(0), JDK_Version(0) }
252 };
254 // Returns true if the flag is obsolete and fits into the range specified
255 // for being ignored. In the case that the flag is ignored, the 'version'
256 // value is filled in with the version number when the flag became
257 // obsolete so that that value can be displayed to the user.
258 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) {
259 int i = 0;
260 assert(version != NULL, "Must provide a version buffer");
261 while (obsolete_jvm_flags[i].name != NULL) {
262 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i];
263 // <flag>=xxx form
264 // [-|+]<flag> form
265 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) ||
266 ((s[0] == '+' || s[0] == '-') &&
267 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) {
268 if (JDK_Version::current().compare(flag_status.accept_until) == -1) {
269 *version = flag_status.obsoleted_in;
270 return true;
271 }
272 }
273 i++;
274 }
275 return false;
276 }
278 // Constructs the system class path (aka boot class path) from the following
279 // components, in order:
280 //
281 // prefix // from -Xbootclasspath/p:...
282 // endorsed // the expansion of -Djava.endorsed.dirs=...
283 // base // from os::get_system_properties() or -Xbootclasspath=
284 // suffix // from -Xbootclasspath/a:...
285 //
286 // java.endorsed.dirs is a list of directories; any jar or zip files in the
287 // directories are added to the sysclasspath just before the base.
288 //
289 // This could be AllStatic, but it isn't needed after argument processing is
290 // complete.
291 class SysClassPath: public StackObj {
292 public:
293 SysClassPath(const char* base);
294 ~SysClassPath();
296 inline void set_base(const char* base);
297 inline void add_prefix(const char* prefix);
298 inline void add_suffix_to_prefix(const char* suffix);
299 inline void add_suffix(const char* suffix);
300 inline void reset_path(const char* base);
302 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs
303 // property. Must be called after all command-line arguments have been
304 // processed (in particular, -Djava.endorsed.dirs=...) and before calling
305 // combined_path().
306 void expand_endorsed();
308 inline const char* get_base() const { return _items[_scp_base]; }
309 inline const char* get_prefix() const { return _items[_scp_prefix]; }
310 inline const char* get_suffix() const { return _items[_scp_suffix]; }
311 inline const char* get_endorsed() const { return _items[_scp_endorsed]; }
313 // Combine all the components into a single c-heap-allocated string; caller
314 // must free the string if/when no longer needed.
315 char* combined_path();
317 private:
318 // Utility routines.
319 static char* add_to_path(const char* path, const char* str, bool prepend);
320 static char* add_jars_to_path(char* path, const char* directory);
322 inline void reset_item_at(int index);
324 // Array indices for the items that make up the sysclasspath. All except the
325 // base are allocated in the C heap and freed by this class.
326 enum {
327 _scp_prefix, // from -Xbootclasspath/p:...
328 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=...
329 _scp_base, // the default sysclasspath
330 _scp_suffix, // from -Xbootclasspath/a:...
331 _scp_nitems // the number of items, must be last.
332 };
334 const char* _items[_scp_nitems];
335 DEBUG_ONLY(bool _expansion_done;)
336 };
338 SysClassPath::SysClassPath(const char* base) {
339 memset(_items, 0, sizeof(_items));
340 _items[_scp_base] = base;
341 DEBUG_ONLY(_expansion_done = false;)
342 }
344 SysClassPath::~SysClassPath() {
345 // Free everything except the base.
346 for (int i = 0; i < _scp_nitems; ++i) {
347 if (i != _scp_base) reset_item_at(i);
348 }
349 DEBUG_ONLY(_expansion_done = false;)
350 }
352 inline void SysClassPath::set_base(const char* base) {
353 _items[_scp_base] = base;
354 }
356 inline void SysClassPath::add_prefix(const char* prefix) {
357 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true);
358 }
360 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) {
361 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false);
362 }
364 inline void SysClassPath::add_suffix(const char* suffix) {
365 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false);
366 }
368 inline void SysClassPath::reset_item_at(int index) {
369 assert(index < _scp_nitems && index != _scp_base, "just checking");
370 if (_items[index] != NULL) {
371 FREE_C_HEAP_ARRAY(char, _items[index]);
372 _items[index] = NULL;
373 }
374 }
376 inline void SysClassPath::reset_path(const char* base) {
377 // Clear the prefix and suffix.
378 reset_item_at(_scp_prefix);
379 reset_item_at(_scp_suffix);
380 set_base(base);
381 }
383 //------------------------------------------------------------------------------
385 void SysClassPath::expand_endorsed() {
386 assert(_items[_scp_endorsed] == NULL, "can only be called once.");
388 const char* path = Arguments::get_property("java.endorsed.dirs");
389 if (path == NULL) {
390 path = Arguments::get_endorsed_dir();
391 assert(path != NULL, "no default for java.endorsed.dirs");
392 }
394 char* expanded_path = NULL;
395 const char separator = *os::path_separator();
396 const char* const end = path + strlen(path);
397 while (path < end) {
398 const char* tmp_end = strchr(path, separator);
399 if (tmp_end == NULL) {
400 expanded_path = add_jars_to_path(expanded_path, path);
401 path = end;
402 } else {
403 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1);
404 memcpy(dirpath, path, tmp_end - path);
405 dirpath[tmp_end - path] = '\0';
406 expanded_path = add_jars_to_path(expanded_path, dirpath);
407 FREE_C_HEAP_ARRAY(char, dirpath);
408 path = tmp_end + 1;
409 }
410 }
411 _items[_scp_endorsed] = expanded_path;
412 DEBUG_ONLY(_expansion_done = true;)
413 }
415 // Combine the bootclasspath elements, some of which may be null, into a single
416 // c-heap-allocated string.
417 char* SysClassPath::combined_path() {
418 assert(_items[_scp_base] != NULL, "empty default sysclasspath");
419 assert(_expansion_done, "must call expand_endorsed() first.");
421 size_t lengths[_scp_nitems];
422 size_t total_len = 0;
424 const char separator = *os::path_separator();
426 // Get the lengths.
427 int i;
428 for (i = 0; i < _scp_nitems; ++i) {
429 if (_items[i] != NULL) {
430 lengths[i] = strlen(_items[i]);
431 // Include space for the separator char (or a NULL for the last item).
432 total_len += lengths[i] + 1;
433 }
434 }
435 assert(total_len > 0, "empty sysclasspath not allowed");
437 // Copy the _items to a single string.
438 char* cp = NEW_C_HEAP_ARRAY(char, total_len);
439 char* cp_tmp = cp;
440 for (i = 0; i < _scp_nitems; ++i) {
441 if (_items[i] != NULL) {
442 memcpy(cp_tmp, _items[i], lengths[i]);
443 cp_tmp += lengths[i];
444 *cp_tmp++ = separator;
445 }
446 }
447 *--cp_tmp = '\0'; // Replace the extra separator.
448 return cp;
449 }
451 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
452 char*
453 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) {
454 char *cp;
456 assert(str != NULL, "just checking");
457 if (path == NULL) {
458 size_t len = strlen(str) + 1;
459 cp = NEW_C_HEAP_ARRAY(char, len);
460 memcpy(cp, str, len); // copy the trailing null
461 } else {
462 const char separator = *os::path_separator();
463 size_t old_len = strlen(path);
464 size_t str_len = strlen(str);
465 size_t len = old_len + str_len + 2;
467 if (prepend) {
468 cp = NEW_C_HEAP_ARRAY(char, len);
469 char* cp_tmp = cp;
470 memcpy(cp_tmp, str, str_len);
471 cp_tmp += str_len;
472 *cp_tmp = separator;
473 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null
474 FREE_C_HEAP_ARRAY(char, path);
475 } else {
476 cp = REALLOC_C_HEAP_ARRAY(char, path, len);
477 char* cp_tmp = cp + old_len;
478 *cp_tmp = separator;
479 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null
480 }
481 }
482 return cp;
483 }
485 // Scan the directory and append any jar or zip files found to path.
486 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null.
487 char* SysClassPath::add_jars_to_path(char* path, const char* directory) {
488 DIR* dir = os::opendir(directory);
489 if (dir == NULL) return path;
491 char dir_sep[2] = { '\0', '\0' };
492 size_t directory_len = strlen(directory);
493 const char fileSep = *os::file_separator();
494 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep;
496 /* Scan the directory for jars/zips, appending them to path. */
497 struct dirent *entry;
498 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory));
499 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) {
500 const char* name = entry->d_name;
501 const char* ext = name + strlen(name) - 4;
502 bool isJarOrZip = ext > name &&
503 (os::file_name_strcmp(ext, ".jar") == 0 ||
504 os::file_name_strcmp(ext, ".zip") == 0);
505 if (isJarOrZip) {
506 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name));
507 sprintf(jarpath, "%s%s%s", directory, dir_sep, name);
508 path = add_to_path(path, jarpath, false);
509 FREE_C_HEAP_ARRAY(char, jarpath);
510 }
511 }
512 FREE_C_HEAP_ARRAY(char, dbuf);
513 os::closedir(dir);
514 return path;
515 }
517 // Parses a memory size specification string.
518 static bool atomull(const char *s, julong* result) {
519 julong n = 0;
520 int args_read = sscanf(s, os::julong_format_specifier(), &n);
521 if (args_read != 1) {
522 return false;
523 }
524 while (*s != '\0' && isdigit(*s)) {
525 s++;
526 }
527 // 4705540: illegal if more characters are found after the first non-digit
528 if (strlen(s) > 1) {
529 return false;
530 }
531 switch (*s) {
532 case 'T': case 't':
533 *result = n * G * K;
534 // Check for overflow.
535 if (*result/((julong)G * K) != n) return false;
536 return true;
537 case 'G': case 'g':
538 *result = n * G;
539 if (*result/G != n) return false;
540 return true;
541 case 'M': case 'm':
542 *result = n * M;
543 if (*result/M != n) return false;
544 return true;
545 case 'K': case 'k':
546 *result = n * K;
547 if (*result/K != n) return false;
548 return true;
549 case '\0':
550 *result = n;
551 return true;
552 default:
553 return false;
554 }
555 }
557 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) {
558 if (size < min_size) return arg_too_small;
559 // Check that size will fit in a size_t (only relevant on 32-bit)
560 if (size > max_uintx) return arg_too_big;
561 return arg_in_range;
562 }
564 // Describe an argument out of range error
565 void Arguments::describe_range_error(ArgsRange errcode) {
566 switch(errcode) {
567 case arg_too_big:
568 jio_fprintf(defaultStream::error_stream(),
569 "The specified size exceeds the maximum "
570 "representable size.\n");
571 break;
572 case arg_too_small:
573 case arg_unreadable:
574 case arg_in_range:
575 // do nothing for now
576 break;
577 default:
578 ShouldNotReachHere();
579 }
580 }
582 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) {
583 return CommandLineFlags::boolAtPut(name, &value, origin);
584 }
586 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
587 double v;
588 if (sscanf(value, "%lf", &v) != 1) {
589 return false;
590 }
592 if (CommandLineFlags::doubleAtPut(name, &v, origin)) {
593 return true;
594 }
595 return false;
596 }
598 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) {
599 julong v;
600 intx intx_v;
601 bool is_neg = false;
602 // Check the sign first since atomull() parses only unsigned values.
603 if (*value == '-') {
604 if (!CommandLineFlags::intxAt(name, &intx_v)) {
605 return false;
606 }
607 value++;
608 is_neg = true;
609 }
610 if (!atomull(value, &v)) {
611 return false;
612 }
613 intx_v = (intx) v;
614 if (is_neg) {
615 intx_v = -intx_v;
616 }
617 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) {
618 return true;
619 }
620 uintx uintx_v = (uintx) v;
621 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) {
622 return true;
623 }
624 uint64_t uint64_t_v = (uint64_t) v;
625 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) {
626 return true;
627 }
628 return false;
629 }
631 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) {
632 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false;
633 // Contract: CommandLineFlags always returns a pointer that needs freeing.
634 FREE_C_HEAP_ARRAY(char, value);
635 return true;
636 }
638 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) {
639 const char* old_value = "";
640 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false;
641 size_t old_len = old_value != NULL ? strlen(old_value) : 0;
642 size_t new_len = strlen(new_value);
643 const char* value;
644 char* free_this_too = NULL;
645 if (old_len == 0) {
646 value = new_value;
647 } else if (new_len == 0) {
648 value = old_value;
649 } else {
650 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1);
651 // each new setting adds another LINE to the switch:
652 sprintf(buf, "%s\n%s", old_value, new_value);
653 value = buf;
654 free_this_too = buf;
655 }
656 (void) CommandLineFlags::ccstrAtPut(name, &value, origin);
657 // CommandLineFlags always returns a pointer that needs freeing.
658 FREE_C_HEAP_ARRAY(char, value);
659 if (free_this_too != NULL) {
660 // CommandLineFlags made its own copy, so I must delete my own temp. buffer.
661 FREE_C_HEAP_ARRAY(char, free_this_too);
662 }
663 return true;
664 }
666 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) {
668 // range of acceptable characters spelled out for portability reasons
669 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]"
670 #define BUFLEN 255
671 char name[BUFLEN+1];
672 char dummy;
674 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
675 return set_bool_flag(name, false, origin);
676 }
677 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) {
678 return set_bool_flag(name, true, origin);
679 }
681 char punct;
682 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') {
683 const char* value = strchr(arg, '=') + 1;
684 Flag* flag = Flag::find_flag(name, strlen(name));
685 if (flag != NULL && flag->is_ccstr()) {
686 if (flag->ccstr_accumulates()) {
687 return append_to_string_flag(name, value, origin);
688 } else {
689 if (value[0] == '\0') {
690 value = NULL;
691 }
692 return set_string_flag(name, value, origin);
693 }
694 }
695 }
697 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') {
698 const char* value = strchr(arg, '=') + 1;
699 // -XX:Foo:=xxx will reset the string flag to the given value.
700 if (value[0] == '\0') {
701 value = NULL;
702 }
703 return set_string_flag(name, value, origin);
704 }
706 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]"
707 #define SIGNED_NUMBER_RANGE "[-0123456789]"
708 #define NUMBER_RANGE "[0123456789]"
709 char value[BUFLEN + 1];
710 char value2[BUFLEN + 1];
711 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) {
712 // Looks like a floating-point number -- try again with more lenient format string
713 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) {
714 return set_fp_numeric_flag(name, value, origin);
715 }
716 }
718 #define VALUE_RANGE "[-kmgtKMGT0123456789]"
719 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) {
720 return set_numeric_flag(name, value, origin);
721 }
723 return false;
724 }
726 void Arguments::add_string(char*** bldarray, int* count, const char* arg) {
727 assert(bldarray != NULL, "illegal argument");
729 if (arg == NULL) {
730 return;
731 }
733 int index = *count;
735 // expand the array and add arg to the last element
736 (*count)++;
737 if (*bldarray == NULL) {
738 *bldarray = NEW_C_HEAP_ARRAY(char*, *count);
739 } else {
740 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count);
741 }
742 (*bldarray)[index] = strdup(arg);
743 }
745 void Arguments::build_jvm_args(const char* arg) {
746 add_string(&_jvm_args_array, &_num_jvm_args, arg);
747 }
749 void Arguments::build_jvm_flags(const char* arg) {
750 add_string(&_jvm_flags_array, &_num_jvm_flags, arg);
751 }
753 // utility function to return a string that concatenates all
754 // strings in a given char** array
755 const char* Arguments::build_resource_string(char** args, int count) {
756 if (args == NULL || count == 0) {
757 return NULL;
758 }
759 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator
760 for (int i = 1; i < count; i++) {
761 length += strlen(args[i]) + 1; // add 1 for a space
762 }
763 char* s = NEW_RESOURCE_ARRAY(char, length);
764 strcpy(s, args[0]);
765 for (int j = 1; j < count; j++) {
766 strcat(s, " ");
767 strcat(s, args[j]);
768 }
769 return (const char*) s;
770 }
772 void Arguments::print_on(outputStream* st) {
773 st->print_cr("VM Arguments:");
774 if (num_jvm_flags() > 0) {
775 st->print("jvm_flags: "); print_jvm_flags_on(st);
776 }
777 if (num_jvm_args() > 0) {
778 st->print("jvm_args: "); print_jvm_args_on(st);
779 }
780 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>");
781 st->print_cr("Launcher Type: %s", _sun_java_launcher);
782 }
784 void Arguments::print_jvm_flags_on(outputStream* st) {
785 if (_num_jvm_flags > 0) {
786 for (int i=0; i < _num_jvm_flags; i++) {
787 st->print("%s ", _jvm_flags_array[i]);
788 }
789 st->print_cr("");
790 }
791 }
793 void Arguments::print_jvm_args_on(outputStream* st) {
794 if (_num_jvm_args > 0) {
795 for (int i=0; i < _num_jvm_args; i++) {
796 st->print("%s ", _jvm_args_array[i]);
797 }
798 st->print_cr("");
799 }
800 }
802 bool Arguments::process_argument(const char* arg,
803 jboolean ignore_unrecognized, FlagValueOrigin origin) {
805 JDK_Version since = JDK_Version();
807 if (parse_argument(arg, origin) || ignore_unrecognized) {
808 return true;
809 }
811 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg;
812 if (is_newly_obsolete(arg, &since)) {
813 char version[256];
814 since.to_string(version, sizeof(version));
815 warning("ignoring option %s; support was removed in %s", argname, version);
816 return true;
817 }
819 // For locked flags, report a custom error message if available.
820 // Otherwise, report the standard unrecognized VM option.
822 Flag* locked_flag = Flag::find_flag((char*)argname, strlen(argname), true);
823 if (locked_flag != NULL) {
824 char locked_message_buf[BUFLEN];
825 locked_flag->get_locked_message(locked_message_buf, BUFLEN);
826 if (strlen(locked_message_buf) == 0) {
827 jio_fprintf(defaultStream::error_stream(),
828 "Unrecognized VM option '%s'\n", argname);
829 } else {
830 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf);
831 }
832 } else {
833 jio_fprintf(defaultStream::error_stream(),
834 "Unrecognized VM option '%s'\n", argname);
835 }
837 // allow for commandline "commenting out" options like -XX:#+Verbose
838 return arg[0] == '#';
839 }
841 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) {
842 FILE* stream = fopen(file_name, "rb");
843 if (stream == NULL) {
844 if (should_exist) {
845 jio_fprintf(defaultStream::error_stream(),
846 "Could not open settings file %s\n", file_name);
847 return false;
848 } else {
849 return true;
850 }
851 }
853 char token[1024];
854 int pos = 0;
856 bool in_white_space = true;
857 bool in_comment = false;
858 bool in_quote = false;
859 char quote_c = 0;
860 bool result = true;
862 int c = getc(stream);
863 while(c != EOF) {
864 if (in_white_space) {
865 if (in_comment) {
866 if (c == '\n') in_comment = false;
867 } else {
868 if (c == '#') in_comment = true;
869 else if (!isspace(c)) {
870 in_white_space = false;
871 token[pos++] = c;
872 }
873 }
874 } else {
875 if (c == '\n' || (!in_quote && isspace(c))) {
876 // token ends at newline, or at unquoted whitespace
877 // this allows a way to include spaces in string-valued options
878 token[pos] = '\0';
879 logOption(token);
880 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
881 build_jvm_flags(token);
882 pos = 0;
883 in_white_space = true;
884 in_quote = false;
885 } else if (!in_quote && (c == '\'' || c == '"')) {
886 in_quote = true;
887 quote_c = c;
888 } else if (in_quote && (c == quote_c)) {
889 in_quote = false;
890 } else {
891 token[pos++] = c;
892 }
893 }
894 c = getc(stream);
895 }
896 if (pos > 0) {
897 token[pos] = '\0';
898 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE);
899 build_jvm_flags(token);
900 }
901 fclose(stream);
902 return result;
903 }
905 //=============================================================================================================
906 // Parsing of properties (-D)
908 const char* Arguments::get_property(const char* key) {
909 return PropertyList_get_value(system_properties(), key);
910 }
912 bool Arguments::add_property(const char* prop) {
913 const char* eq = strchr(prop, '=');
914 char* key;
915 // ns must be static--its address may be stored in a SystemProperty object.
916 const static char ns[1] = {0};
917 char* value = (char *)ns;
919 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop);
920 key = AllocateHeap(key_len + 1, "add_property");
921 strncpy(key, prop, key_len);
922 key[key_len] = '\0';
924 if (eq != NULL) {
925 size_t value_len = strlen(prop) - key_len - 1;
926 value = AllocateHeap(value_len + 1, "add_property");
927 strncpy(value, &prop[key_len + 1], value_len + 1);
928 }
930 if (strcmp(key, "java.compiler") == 0) {
931 process_java_compiler_argument(value);
932 FreeHeap(key);
933 if (eq != NULL) {
934 FreeHeap(value);
935 }
936 return true;
937 } else if (strcmp(key, "sun.java.command") == 0) {
938 _java_command = value;
940 // Record value in Arguments, but let it get passed to Java.
941 } else if (strcmp(key, "sun.java.launcher.pid") == 0) {
942 // launcher.pid property is private and is processed
943 // in process_sun_java_launcher_properties();
944 // the sun.java.launcher property is passed on to the java application
945 FreeHeap(key);
946 if (eq != NULL) {
947 FreeHeap(value);
948 }
949 return true;
950 } else if (strcmp(key, "java.vendor.url.bug") == 0) {
951 // save it in _java_vendor_url_bug, so JVM fatal error handler can access
952 // its value without going through the property list or making a Java call.
953 _java_vendor_url_bug = value;
954 } else if (strcmp(key, "sun.boot.library.path") == 0) {
955 PropertyList_unique_add(&_system_properties, key, value, true);
956 return true;
957 }
958 // Create new property and add at the end of the list
959 PropertyList_unique_add(&_system_properties, key, value);
960 return true;
961 }
963 //===========================================================================================================
964 // Setting int/mixed/comp mode flags
966 void Arguments::set_mode_flags(Mode mode) {
967 // Set up default values for all flags.
968 // If you add a flag to any of the branches below,
969 // add a default value for it here.
970 set_java_compiler(false);
971 _mode = mode;
973 // Ensure Agent_OnLoad has the correct initial values.
974 // This may not be the final mode; mode may change later in onload phase.
975 PropertyList_unique_add(&_system_properties, "java.vm.info",
976 (char*)VM_Version::vm_info_string(), false);
978 UseInterpreter = true;
979 UseCompiler = true;
980 UseLoopCounter = true;
982 #ifndef ZERO
983 // Turn these off for mixed and comp. Leave them on for Zero.
984 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) {
985 UseFastAccessorMethods = (mode == _int);
986 }
987 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) {
988 UseFastEmptyMethods = (mode == _int);
989 }
990 #endif
992 // Default values may be platform/compiler dependent -
993 // use the saved values
994 ClipInlining = Arguments::_ClipInlining;
995 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods;
996 UseOnStackReplacement = Arguments::_UseOnStackReplacement;
997 BackgroundCompilation = Arguments::_BackgroundCompilation;
999 // Change from defaults based on mode
1000 switch (mode) {
1001 default:
1002 ShouldNotReachHere();
1003 break;
1004 case _int:
1005 UseCompiler = false;
1006 UseLoopCounter = false;
1007 AlwaysCompileLoopMethods = false;
1008 UseOnStackReplacement = false;
1009 break;
1010 case _mixed:
1011 // same as default
1012 break;
1013 case _comp:
1014 UseInterpreter = false;
1015 BackgroundCompilation = false;
1016 ClipInlining = false;
1017 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more.
1018 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and
1019 // compile a level 4 (C2) and then continue executing it.
1020 if (TieredCompilation) {
1021 Tier3InvokeNotifyFreqLog = 0;
1022 Tier4InvocationThreshold = 0;
1023 }
1024 break;
1025 }
1026 }
1028 // Conflict: required to use shared spaces (-Xshare:on), but
1029 // incompatible command line options were chosen.
1031 static void no_shared_spaces() {
1032 if (RequireSharedSpaces) {
1033 jio_fprintf(defaultStream::error_stream(),
1034 "Class data sharing is inconsistent with other specified options.\n");
1035 vm_exit_during_initialization("Unable to use shared archive.", NULL);
1036 } else {
1037 FLAG_SET_DEFAULT(UseSharedSpaces, false);
1038 }
1039 }
1041 void Arguments::set_tiered_flags() {
1042 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3.
1043 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) {
1044 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3);
1045 }
1046 if (CompilationPolicyChoice < 2) {
1047 vm_exit_during_initialization(
1048 "Incompatible compilation policy selected", NULL);
1049 }
1050 // Increase the code cache size - tiered compiles a lot more.
1051 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) {
1052 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2);
1053 }
1054 }
1056 #ifndef KERNEL
1057 static void disable_adaptive_size_policy(const char* collector_name) {
1058 if (UseAdaptiveSizePolicy) {
1059 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) {
1060 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.",
1061 collector_name);
1062 }
1063 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false);
1064 }
1065 }
1067 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC
1068 // if it's not explictly set or unset. If the user has chosen
1069 // UseParNewGC and not explicitly set ParallelGCThreads we
1070 // set it, unless this is a single cpu machine.
1071 void Arguments::set_parnew_gc_flags() {
1072 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC,
1073 "control point invariant");
1074 assert(UseParNewGC, "Error");
1076 // Turn off AdaptiveSizePolicy for parnew until it is complete.
1077 disable_adaptive_size_policy("UseParNewGC");
1079 if (ParallelGCThreads == 0) {
1080 FLAG_SET_DEFAULT(ParallelGCThreads,
1081 Abstract_VM_Version::parallel_worker_threads());
1082 if (ParallelGCThreads == 1) {
1083 FLAG_SET_DEFAULT(UseParNewGC, false);
1084 FLAG_SET_DEFAULT(ParallelGCThreads, 0);
1085 }
1086 }
1087 if (UseParNewGC) {
1088 // CDS doesn't work with ParNew yet
1089 no_shared_spaces();
1091 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively,
1092 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration
1093 // we set them to 1024 and 1024.
1094 // See CR 6362902.
1095 if (FLAG_IS_DEFAULT(YoungPLABSize)) {
1096 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024);
1097 }
1098 if (FLAG_IS_DEFAULT(OldPLABSize)) {
1099 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024);
1100 }
1102 // AlwaysTenure flag should make ParNew promote all at first collection.
1103 // See CR 6362902.
1104 if (AlwaysTenure) {
1105 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0);
1106 }
1107 // When using compressed oops, we use local overflow stacks,
1108 // rather than using a global overflow list chained through
1109 // the klass word of the object's pre-image.
1110 if (UseCompressedOops && !ParGCUseLocalOverflow) {
1111 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) {
1112 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references");
1113 }
1114 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true);
1115 }
1116 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error");
1117 }
1118 }
1120 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on
1121 // sparc/solaris for certain applications, but would gain from
1122 // further optimization and tuning efforts, and would almost
1123 // certainly gain from analysis of platform and environment.
1124 void Arguments::set_cms_and_parnew_gc_flags() {
1125 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error");
1126 assert(UseConcMarkSweepGC, "CMS is expected to be on here");
1128 // If we are using CMS, we prefer to UseParNewGC,
1129 // unless explicitly forbidden.
1130 if (FLAG_IS_DEFAULT(UseParNewGC)) {
1131 FLAG_SET_ERGO(bool, UseParNewGC, true);
1132 }
1134 // Turn off AdaptiveSizePolicy for CMS until it is complete.
1135 disable_adaptive_size_policy("UseConcMarkSweepGC");
1137 // In either case, adjust ParallelGCThreads and/or UseParNewGC
1138 // as needed.
1139 if (UseParNewGC) {
1140 set_parnew_gc_flags();
1141 }
1143 // MaxHeapSize is aligned down in collectorPolicy
1144 size_t max_heap = align_size_down(MaxHeapSize,
1145 CardTableRS::ct_max_alignment_constraint());
1147 // Now make adjustments for CMS
1148 intx tenuring_default = (intx)6;
1149 size_t young_gen_per_worker = CMSYoungGenPerWorker;
1151 // Preferred young gen size for "short" pauses:
1152 // upper bound depends on # of threads and NewRatio.
1153 const uintx parallel_gc_threads =
1154 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads);
1155 const size_t preferred_max_new_size_unaligned =
1156 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads));
1157 size_t preferred_max_new_size =
1158 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size());
1160 // Unless explicitly requested otherwise, size young gen
1161 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads
1163 // If either MaxNewSize or NewRatio is set on the command line,
1164 // assume the user is trying to set the size of the young gen.
1165 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) {
1167 // Set MaxNewSize to our calculated preferred_max_new_size unless
1168 // NewSize was set on the command line and it is larger than
1169 // preferred_max_new_size.
1170 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line
1171 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size));
1172 } else {
1173 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size);
1174 }
1175 if (PrintGCDetails && Verbose) {
1176 // Too early to use gclog_or_tty
1177 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize);
1178 }
1180 // Code along this path potentially sets NewSize and OldSize
1182 assert(max_heap >= InitialHeapSize, "Error");
1183 assert(max_heap >= NewSize, "Error");
1185 if (PrintGCDetails && Verbose) {
1186 // Too early to use gclog_or_tty
1187 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT
1188 " initial_heap_size: " SIZE_FORMAT
1189 " max_heap: " SIZE_FORMAT,
1190 min_heap_size(), InitialHeapSize, max_heap);
1191 }
1192 size_t min_new = preferred_max_new_size;
1193 if (FLAG_IS_CMDLINE(NewSize)) {
1194 min_new = NewSize;
1195 }
1196 if (max_heap > min_new && min_heap_size() > min_new) {
1197 // Unless explicitly requested otherwise, make young gen
1198 // at least min_new, and at most preferred_max_new_size.
1199 if (FLAG_IS_DEFAULT(NewSize)) {
1200 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new));
1201 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize));
1202 if (PrintGCDetails && Verbose) {
1203 // Too early to use gclog_or_tty
1204 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize);
1205 }
1206 }
1207 // Unless explicitly requested otherwise, size old gen
1208 // so it's NewRatio x of NewSize.
1209 if (FLAG_IS_DEFAULT(OldSize)) {
1210 if (max_heap > NewSize) {
1211 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize));
1212 if (PrintGCDetails && Verbose) {
1213 // Too early to use gclog_or_tty
1214 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize);
1215 }
1216 }
1217 }
1218 }
1219 }
1220 // Unless explicitly requested otherwise, definitely
1221 // promote all objects surviving "tenuring_default" scavenges.
1222 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) &&
1223 FLAG_IS_DEFAULT(SurvivorRatio)) {
1224 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default);
1225 }
1226 // If we decided above (or user explicitly requested)
1227 // `promote all' (via MaxTenuringThreshold := 0),
1228 // prefer minuscule survivor spaces so as not to waste
1229 // space for (non-existent) survivors
1230 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) {
1231 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio));
1232 }
1233 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not,
1234 // set CMSParPromoteBlocksToClaim equal to OldPLABSize.
1235 // This is done in order to make ParNew+CMS configuration to work
1236 // with YoungPLABSize and OldPLABSize options.
1237 // See CR 6362902.
1238 if (!FLAG_IS_DEFAULT(OldPLABSize)) {
1239 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1240 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim
1241 // is. In this situtation let CMSParPromoteBlocksToClaim follow
1242 // the value (either from the command line or ergonomics) of
1243 // OldPLABSize. Following OldPLABSize is an ergonomics decision.
1244 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize);
1245 } else {
1246 // OldPLABSize and CMSParPromoteBlocksToClaim are both set.
1247 // CMSParPromoteBlocksToClaim is a collector-specific flag, so
1248 // we'll let it to take precedence.
1249 jio_fprintf(defaultStream::error_stream(),
1250 "Both OldPLABSize and CMSParPromoteBlocksToClaim"
1251 " options are specified for the CMS collector."
1252 " CMSParPromoteBlocksToClaim will take precedence.\n");
1253 }
1254 }
1255 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) {
1256 // OldPLAB sizing manually turned off: Use a larger default setting,
1257 // unless it was manually specified. This is because a too-low value
1258 // will slow down scavenges.
1259 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) {
1260 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166
1261 }
1262 }
1263 // Overwrite OldPLABSize which is the variable we will internally use everywhere.
1264 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim);
1265 // If either of the static initialization defaults have changed, note this
1266 // modification.
1267 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) {
1268 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight);
1269 }
1270 if (PrintGCDetails && Verbose) {
1271 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1272 MarkStackSize / K, MarkStackSizeMax / K);
1273 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1274 }
1275 }
1276 #endif // KERNEL
1278 void set_object_alignment() {
1279 // Object alignment.
1280 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2");
1281 MinObjAlignmentInBytes = ObjectAlignmentInBytes;
1282 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small");
1283 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize;
1284 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect");
1285 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1;
1287 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes);
1288 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize;
1290 // Oop encoding heap max
1291 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes;
1293 #ifndef KERNEL
1294 // Set CMS global values
1295 CompactibleFreeListSpace::set_cms_values();
1296 #endif // KERNEL
1297 }
1299 bool verify_object_alignment() {
1300 // Object alignment.
1301 if (!is_power_of_2(ObjectAlignmentInBytes)) {
1302 jio_fprintf(defaultStream::error_stream(),
1303 "error: ObjectAlignmentInBytes=%d must be power of 2\n",
1304 (int)ObjectAlignmentInBytes);
1305 return false;
1306 }
1307 if ((int)ObjectAlignmentInBytes < BytesPerLong) {
1308 jio_fprintf(defaultStream::error_stream(),
1309 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n",
1310 (int)ObjectAlignmentInBytes, BytesPerLong);
1311 return false;
1312 }
1313 // It does not make sense to have big object alignment
1314 // since a space lost due to alignment will be greater
1315 // then a saved space from compressed oops.
1316 if ((int)ObjectAlignmentInBytes > 256) {
1317 jio_fprintf(defaultStream::error_stream(),
1318 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n",
1319 (int)ObjectAlignmentInBytes);
1320 return false;
1321 }
1322 // In case page size is very small.
1323 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) {
1324 jio_fprintf(defaultStream::error_stream(),
1325 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n",
1326 (int)ObjectAlignmentInBytes, os::vm_page_size());
1327 return false;
1328 }
1329 return true;
1330 }
1332 inline uintx max_heap_for_compressed_oops() {
1333 // Avoid sign flip.
1334 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) {
1335 return 0;
1336 }
1337 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size());
1338 NOT_LP64(ShouldNotReachHere(); return 0);
1339 }
1341 bool Arguments::should_auto_select_low_pause_collector() {
1342 if (UseAutoGCSelectPolicy &&
1343 !FLAG_IS_DEFAULT(MaxGCPauseMillis) &&
1344 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) {
1345 if (PrintGCDetails) {
1346 // Cannot use gclog_or_tty yet.
1347 tty->print_cr("Automatic selection of the low pause collector"
1348 " based on pause goal of %d (ms)", MaxGCPauseMillis);
1349 }
1350 return true;
1351 }
1352 return false;
1353 }
1355 void Arguments::set_ergonomics_flags() {
1356 // Parallel GC is not compatible with sharing. If one specifies
1357 // that they want sharing explicitly, do not set ergonomics flags.
1358 if (DumpSharedSpaces || RequireSharedSpaces) {
1359 return;
1360 }
1362 if (os::is_server_class_machine()) {
1363 // If no other collector is requested explicitly,
1364 // let the VM select the collector based on
1365 // machine class and automatic selection policy.
1366 if (!UseSerialGC &&
1367 !UseConcMarkSweepGC &&
1368 !UseG1GC &&
1369 !UseParNewGC &&
1370 !DumpSharedSpaces &&
1371 FLAG_IS_DEFAULT(UseParallelGC)) {
1372 if (should_auto_select_low_pause_collector()) {
1373 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true);
1374 } else {
1375 FLAG_SET_ERGO(bool, UseParallelGC, true);
1376 }
1377 no_shared_spaces();
1378 }
1379 }
1381 #ifndef ZERO
1382 #ifdef _LP64
1383 // Check that UseCompressedOops can be set with the max heap size allocated
1384 // by ergonomics.
1385 if (MaxHeapSize <= max_heap_for_compressed_oops()) {
1386 #if !defined(COMPILER1) || defined(TIERED)
1387 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
1388 FLAG_SET_ERGO(bool, UseCompressedOops, true);
1389 }
1390 #endif
1391 #ifdef _WIN64
1392 if (UseLargePages && UseCompressedOops) {
1393 // Cannot allocate guard pages for implicit checks in indexed addressing
1394 // mode, when large pages are specified on windows.
1395 // This flag could be switched ON if narrow oop base address is set to 0,
1396 // see code in Universe::initialize_heap().
1397 Universe::set_narrow_oop_use_implicit_null_checks(false);
1398 }
1399 #endif // _WIN64
1400 } else {
1401 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {
1402 warning("Max heap size too large for Compressed Oops");
1403 FLAG_SET_DEFAULT(UseCompressedOops, false);
1404 }
1405 }
1406 // Also checks that certain machines are slower with compressed oops
1407 // in vm_version initialization code.
1408 #endif // _LP64
1409 #endif // !ZERO
1410 }
1412 void Arguments::set_parallel_gc_flags() {
1413 assert(UseParallelGC || UseParallelOldGC, "Error");
1414 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
1415 if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
1416 FLAG_SET_DEFAULT(UseParallelOldGC, true);
1417 }
1418 FLAG_SET_DEFAULT(UseParallelGC, true);
1420 // If no heap maximum was requested explicitly, use some reasonable fraction
1421 // of the physical memory, up to a maximum of 1GB.
1422 if (UseParallelGC) {
1423 FLAG_SET_DEFAULT(ParallelGCThreads,
1424 Abstract_VM_Version::parallel_worker_threads());
1426 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
1427 // SurvivorRatio has been set, reset their default values to SurvivorRatio +
1428 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
1429 // See CR 6362902 for details.
1430 if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
1431 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
1432 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
1433 }
1434 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
1435 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
1436 }
1437 }
1439 if (UseParallelOldGC) {
1440 // Par compact uses lower default values since they are treated as
1441 // minimums. These are different defaults because of the different
1442 // interpretation and are not ergonomically set.
1443 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
1444 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
1445 }
1446 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) {
1447 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5);
1448 }
1449 }
1450 }
1451 if (UseNUMA) {
1452 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) {
1453 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M);
1454 }
1455 // For those collectors or operating systems (eg, Windows) that do
1456 // not support full UseNUMA, we will map to UseNUMAInterleaving for now
1457 UseNUMAInterleaving = true;
1458 }
1459 }
1461 void Arguments::set_g1_gc_flags() {
1462 assert(UseG1GC, "Error");
1463 #ifdef COMPILER1
1464 FastTLABRefill = false;
1465 #endif
1466 FLAG_SET_DEFAULT(ParallelGCThreads,
1467 Abstract_VM_Version::parallel_worker_threads());
1468 if (ParallelGCThreads == 0) {
1469 FLAG_SET_DEFAULT(ParallelGCThreads,
1470 Abstract_VM_Version::parallel_worker_threads());
1471 }
1472 no_shared_spaces();
1474 if (FLAG_IS_DEFAULT(MarkStackSize)) {
1475 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
1476 }
1477 if (PrintGCDetails && Verbose) {
1478 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk",
1479 MarkStackSize / K, MarkStackSizeMax / K);
1480 tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
1481 }
1483 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) {
1484 // In G1, we want the default GC overhead goal to be higher than
1485 // say in PS. So we set it here to 10%. Otherwise the heap might
1486 // be expanded more aggressively than we would like it to. In
1487 // fact, even 10% seems to not be high enough in some cases
1488 // (especially small GC stress tests that the main thing they do
1489 // is allocation). We might consider increase it further.
1490 FLAG_SET_DEFAULT(GCTimeRatio, 9);
1491 }
1492 }
1494 void Arguments::set_heap_size() {
1495 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) {
1496 // Deprecated flag
1497 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction);
1498 }
1500 const julong phys_mem =
1501 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
1502 : (julong)MaxRAM;
1504 // If the maximum heap size has not been set with -Xmx,
1505 // then set it as fraction of the size of physical memory,
1506 // respecting the maximum and minimum sizes of the heap.
1507 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
1508 julong reasonable_max = phys_mem / MaxRAMFraction;
1510 if (phys_mem <= MaxHeapSize * MinRAMFraction) {
1511 // Small physical memory, so use a minimum fraction of it for the heap
1512 reasonable_max = phys_mem / MinRAMFraction;
1513 } else {
1514 // Not-small physical memory, so require a heap at least
1515 // as large as MaxHeapSize
1516 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize);
1517 }
1518 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) {
1519 // Limit the heap size to ErgoHeapSizeLimit
1520 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit);
1521 }
1522 if (UseCompressedOops) {
1523 // Limit the heap size to the maximum possible when using compressed oops
1524 julong max_coop_heap = (julong)max_heap_for_compressed_oops();
1525 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) {
1526 // Heap should be above HeapBaseMinAddress to get zero based compressed oops
1527 // but it should be not less than default MaxHeapSize.
1528 max_coop_heap -= HeapBaseMinAddress;
1529 }
1530 reasonable_max = MIN2(reasonable_max, max_coop_heap);
1531 }
1532 reasonable_max = os::allocatable_physical_memory(reasonable_max);
1534 if (!FLAG_IS_DEFAULT(InitialHeapSize)) {
1535 // An initial heap size was specified on the command line,
1536 // so be sure that the maximum size is consistent. Done
1537 // after call to allocatable_physical_memory because that
1538 // method might reduce the allocation size.
1539 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize);
1540 }
1542 if (PrintGCDetails && Verbose) {
1543 // Cannot use gclog_or_tty yet.
1544 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max);
1545 }
1546 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max);
1547 }
1549 // If the initial_heap_size has not been set with InitialHeapSize
1550 // or -Xms, then set it as fraction of the size of physical memory,
1551 // respecting the maximum and minimum sizes of the heap.
1552 if (FLAG_IS_DEFAULT(InitialHeapSize)) {
1553 julong reasonable_minimum = (julong)(OldSize + NewSize);
1555 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize);
1557 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum);
1559 julong reasonable_initial = phys_mem / InitialRAMFraction;
1561 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum);
1562 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize);
1564 reasonable_initial = os::allocatable_physical_memory(reasonable_initial);
1566 if (PrintGCDetails && Verbose) {
1567 // Cannot use gclog_or_tty yet.
1568 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial);
1569 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum);
1570 }
1571 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial);
1572 set_min_heap_size((uintx)reasonable_minimum);
1573 }
1574 }
1576 // This must be called after ergonomics because we want bytecode rewriting
1577 // if the server compiler is used, or if UseSharedSpaces is disabled.
1578 void Arguments::set_bytecode_flags() {
1579 // Better not attempt to store into a read-only space.
1580 if (UseSharedSpaces) {
1581 FLAG_SET_DEFAULT(RewriteBytecodes, false);
1582 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1583 }
1585 if (!RewriteBytecodes) {
1586 FLAG_SET_DEFAULT(RewriteFrequentPairs, false);
1587 }
1588 }
1590 // Aggressive optimization flags -XX:+AggressiveOpts
1591 void Arguments::set_aggressive_opts_flags() {
1592 #ifdef COMPILER2
1593 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1594 if (FLAG_IS_DEFAULT(EliminateAutoBox)) {
1595 FLAG_SET_DEFAULT(EliminateAutoBox, true);
1596 }
1597 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) {
1598 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000);
1599 }
1601 // Feed the cache size setting into the JDK
1602 char buffer[1024];
1603 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax);
1604 add_property(buffer);
1605 }
1606 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) {
1607 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500);
1608 }
1609 #endif
1611 if (AggressiveOpts) {
1612 // Sample flag setting code
1613 // if (FLAG_IS_DEFAULT(EliminateZeroing)) {
1614 // FLAG_SET_DEFAULT(EliminateZeroing, true);
1615 // }
1616 }
1617 }
1619 //===========================================================================================================
1620 // Parsing of java.compiler property
1622 void Arguments::process_java_compiler_argument(char* arg) {
1623 // For backwards compatibility, Djava.compiler=NONE or ""
1624 // causes us to switch to -Xint mode UNLESS -Xdebug
1625 // is also specified.
1626 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) {
1627 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen.
1628 }
1629 }
1631 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) {
1632 _sun_java_launcher = strdup(launcher);
1633 if (strcmp("gamma", _sun_java_launcher) == 0) {
1634 _created_by_gamma_launcher = true;
1635 }
1636 }
1638 bool Arguments::created_by_java_launcher() {
1639 assert(_sun_java_launcher != NULL, "property must have value");
1640 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0;
1641 }
1643 bool Arguments::created_by_gamma_launcher() {
1644 return _created_by_gamma_launcher;
1645 }
1647 //===========================================================================================================
1648 // Parsing of main arguments
1650 bool Arguments::verify_interval(uintx val, uintx min,
1651 uintx max, const char* name) {
1652 // Returns true iff value is in the inclusive interval [min..max]
1653 // false, otherwise.
1654 if (val >= min && val <= max) {
1655 return true;
1656 }
1657 jio_fprintf(defaultStream::error_stream(),
1658 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT
1659 " and " UINTX_FORMAT "\n",
1660 name, val, min, max);
1661 return false;
1662 }
1664 bool Arguments::verify_min_value(intx val, intx min, const char* name) {
1665 // Returns true if given value is at least specified min threshold
1666 // false, otherwise.
1667 if (val >= min ) {
1668 return true;
1669 }
1670 jio_fprintf(defaultStream::error_stream(),
1671 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n",
1672 name, val, min);
1673 return false;
1674 }
1676 bool Arguments::verify_percentage(uintx value, const char* name) {
1677 if (value <= 100) {
1678 return true;
1679 }
1680 jio_fprintf(defaultStream::error_stream(),
1681 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n",
1682 name, value);
1683 return false;
1684 }
1686 static void force_serial_gc() {
1687 FLAG_SET_DEFAULT(UseSerialGC, true);
1688 FLAG_SET_DEFAULT(UseParNewGC, false);
1689 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false);
1690 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption
1691 FLAG_SET_DEFAULT(UseParallelGC, false);
1692 FLAG_SET_DEFAULT(UseParallelOldGC, false);
1693 FLAG_SET_DEFAULT(UseG1GC, false);
1694 }
1696 static bool verify_serial_gc_flags() {
1697 return (UseSerialGC &&
1698 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC ||
1699 UseParallelGC || UseParallelOldGC));
1700 }
1702 // check if do gclog rotation
1703 // +UseGCLogFileRotation is a must,
1704 // no gc log rotation when log file not supplied or
1705 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0
1706 void check_gclog_consistency() {
1707 if (UseGCLogFileRotation) {
1708 if ((Arguments::gc_log_filename() == NULL) ||
1709 (NumberOfGCLogFiles == 0) ||
1710 (GCLogFileSize == 0)) {
1711 jio_fprintf(defaultStream::output_stream(),
1712 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n"
1713 "where num_of_file > 0 and num_of_size > 0\n"
1714 "GC log rotation is turned off\n");
1715 UseGCLogFileRotation = false;
1716 }
1717 }
1719 if (UseGCLogFileRotation && GCLogFileSize < 8*K) {
1720 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K);
1721 jio_fprintf(defaultStream::output_stream(),
1722 "GCLogFileSize changed to minimum 8K\n");
1723 }
1724 }
1726 // Check consistency of GC selection
1727 bool Arguments::check_gc_consistency() {
1728 check_gclog_consistency();
1729 bool status = true;
1730 // Ensure that the user has not selected conflicting sets
1731 // of collectors. [Note: this check is merely a user convenience;
1732 // collectors over-ride each other so that only a non-conflicting
1733 // set is selected; however what the user gets is not what they
1734 // may have expected from the combination they asked for. It's
1735 // better to reduce user confusion by not allowing them to
1736 // select conflicting combinations.
1737 uint i = 0;
1738 if (UseSerialGC) i++;
1739 if (UseConcMarkSweepGC || UseParNewGC) i++;
1740 if (UseParallelGC || UseParallelOldGC) i++;
1741 if (UseG1GC) i++;
1742 if (i > 1) {
1743 jio_fprintf(defaultStream::error_stream(),
1744 "Conflicting collector combinations in option list; "
1745 "please refer to the release notes for the combinations "
1746 "allowed\n");
1747 status = false;
1748 }
1750 return status;
1751 }
1753 // Check stack pages settings
1754 bool Arguments::check_stack_pages()
1755 {
1756 bool status = true;
1757 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages");
1758 status = status && verify_min_value(StackRedPages, 1, "StackRedPages");
1759 // greater stack shadow pages can't generate instruction to bang stack
1760 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages");
1761 return status;
1762 }
1764 // Check the consistency of vm_init_args
1765 bool Arguments::check_vm_args_consistency() {
1766 // Method for adding checks for flag consistency.
1767 // The intent is to warn the user of all possible conflicts,
1768 // before returning an error.
1769 // Note: Needs platform-dependent factoring.
1770 bool status = true;
1772 #if ( (defined(COMPILER2) && defined(SPARC)))
1773 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init
1774 // on sparc doesn't require generation of a stub as is the case on, e.g.,
1775 // x86. Normally, VM_Version_init must be called from init_globals in
1776 // init.cpp, which is called by the initial java thread *after* arguments
1777 // have been parsed. VM_Version_init gets called twice on sparc.
1778 extern void VM_Version_init();
1779 VM_Version_init();
1780 if (!VM_Version::has_v9()) {
1781 jio_fprintf(defaultStream::error_stream(),
1782 "V8 Machine detected, Server requires V9\n");
1783 status = false;
1784 }
1785 #endif /* COMPILER2 && SPARC */
1787 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product
1788 // builds so the cost of stack banging can be measured.
1789 #if (defined(PRODUCT) && defined(SOLARIS))
1790 if (!UseBoundThreads && !UseStackBanging) {
1791 jio_fprintf(defaultStream::error_stream(),
1792 "-UseStackBanging conflicts with -UseBoundThreads\n");
1794 status = false;
1795 }
1796 #endif
1798 if (TLABRefillWasteFraction == 0) {
1799 jio_fprintf(defaultStream::error_stream(),
1800 "TLABRefillWasteFraction should be a denominator, "
1801 "not " SIZE_FORMAT "\n",
1802 TLABRefillWasteFraction);
1803 status = false;
1804 }
1806 status = status && verify_percentage(AdaptiveSizePolicyWeight,
1807 "AdaptiveSizePolicyWeight");
1808 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight");
1809 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance");
1810 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio");
1811 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio");
1813 if (MinHeapFreeRatio > MaxHeapFreeRatio) {
1814 jio_fprintf(defaultStream::error_stream(),
1815 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or "
1816 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n",
1817 MinHeapFreeRatio, MaxHeapFreeRatio);
1818 status = false;
1819 }
1820 // Keeping the heap 100% free is hard ;-) so limit it to 99%.
1821 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99);
1823 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) {
1824 MarkSweepAlwaysCompactCount = 1; // Move objects every gc.
1825 }
1827 if (UseParallelOldGC && ParallelOldGCSplitALot) {
1828 // Settings to encourage splitting.
1829 if (!FLAG_IS_CMDLINE(NewRatio)) {
1830 FLAG_SET_CMDLINE(intx, NewRatio, 2);
1831 }
1832 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) {
1833 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
1834 }
1835 }
1837 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1838 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit");
1839 if (GCTimeLimit == 100) {
1840 // Turn off gc-overhead-limit-exceeded checks
1841 FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
1842 }
1844 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit");
1846 status = status && check_gc_consistency();
1847 status = status && check_stack_pages();
1849 if (_has_alloc_profile) {
1850 if (UseParallelGC || UseParallelOldGC) {
1851 jio_fprintf(defaultStream::error_stream(),
1852 "error: invalid argument combination.\n"
1853 "Allocation profiling (-Xaprof) cannot be used together with "
1854 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n");
1855 status = false;
1856 }
1857 if (UseConcMarkSweepGC) {
1858 jio_fprintf(defaultStream::error_stream(),
1859 "error: invalid argument combination.\n"
1860 "Allocation profiling (-Xaprof) cannot be used together with "
1861 "the CMS collector (-XX:+UseConcMarkSweepGC).\n");
1862 status = false;
1863 }
1864 }
1866 if (CMSIncrementalMode) {
1867 if (!UseConcMarkSweepGC) {
1868 jio_fprintf(defaultStream::error_stream(),
1869 "error: invalid argument combination.\n"
1870 "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
1871 "selected in order\nto use CMSIncrementalMode.\n");
1872 status = false;
1873 } else {
1874 status = status && verify_percentage(CMSIncrementalDutyCycle,
1875 "CMSIncrementalDutyCycle");
1876 status = status && verify_percentage(CMSIncrementalDutyCycleMin,
1877 "CMSIncrementalDutyCycleMin");
1878 status = status && verify_percentage(CMSIncrementalSafetyFactor,
1879 "CMSIncrementalSafetyFactor");
1880 status = status && verify_percentage(CMSIncrementalOffset,
1881 "CMSIncrementalOffset");
1882 status = status && verify_percentage(CMSExpAvgFactor,
1883 "CMSExpAvgFactor");
1884 // If it was not set on the command line, set
1885 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early.
1886 if (CMSInitiatingOccupancyFraction < 0) {
1887 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1);
1888 }
1889 }
1890 }
1892 // CMS space iteration, which FLSVerifyAllHeapreferences entails,
1893 // insists that we hold the requisite locks so that the iteration is
1894 // MT-safe. For the verification at start-up and shut-down, we don't
1895 // yet have a good way of acquiring and releasing these locks,
1896 // which are not visible at the CollectedHeap level. We want to
1897 // be able to acquire these locks and then do the iteration rather
1898 // than just disable the lock verification. This will be fixed under
1899 // bug 4788986.
1900 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) {
1901 if (VerifyGCStartAt == 0) {
1902 warning("Heap verification at start-up disabled "
1903 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1904 VerifyGCStartAt = 1; // Disable verification at start-up
1905 }
1906 if (VerifyBeforeExit) {
1907 warning("Heap verification at shutdown disabled "
1908 "(due to current incompatibility with FLSVerifyAllHeapReferences)");
1909 VerifyBeforeExit = false; // Disable verification at shutdown
1910 }
1911 }
1913 // Note: only executed in non-PRODUCT mode
1914 if (!UseAsyncConcMarkSweepGC &&
1915 (ExplicitGCInvokesConcurrent ||
1916 ExplicitGCInvokesConcurrentAndUnloadsClasses)) {
1917 jio_fprintf(defaultStream::error_stream(),
1918 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts"
1919 " with -UseAsyncConcMarkSweepGC");
1920 status = false;
1921 }
1923 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk");
1925 #ifndef SERIALGC
1926 if (UseG1GC) {
1927 status = status && verify_percentage(InitiatingHeapOccupancyPercent,
1928 "InitiatingHeapOccupancyPercent");
1929 status = status && verify_min_value(G1RefProcDrainInterval, 1,
1930 "G1RefProcDrainInterval");
1931 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1,
1932 "G1ConcMarkStepDurationMillis");
1933 }
1934 #endif
1936 status = status && verify_interval(RefDiscoveryPolicy,
1937 ReferenceProcessor::DiscoveryPolicyMin,
1938 ReferenceProcessor::DiscoveryPolicyMax,
1939 "RefDiscoveryPolicy");
1941 // Limit the lower bound of this flag to 1 as it is used in a division
1942 // expression.
1943 status = status && verify_interval(TLABWasteTargetPercent,
1944 1, 100, "TLABWasteTargetPercent");
1946 status = status && verify_object_alignment();
1948 return status;
1949 }
1951 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore,
1952 const char* option_type) {
1953 if (ignore) return false;
1955 const char* spacer = " ";
1956 if (option_type == NULL) {
1957 option_type = ++spacer; // Set both to the empty string.
1958 }
1960 if (os::obsolete_option(option)) {
1961 jio_fprintf(defaultStream::error_stream(),
1962 "Obsolete %s%soption: %s\n", option_type, spacer,
1963 option->optionString);
1964 return false;
1965 } else {
1966 jio_fprintf(defaultStream::error_stream(),
1967 "Unrecognized %s%soption: %s\n", option_type, spacer,
1968 option->optionString);
1969 return true;
1970 }
1971 }
1973 static const char* user_assertion_options[] = {
1974 "-da", "-ea", "-disableassertions", "-enableassertions", 0
1975 };
1977 static const char* system_assertion_options[] = {
1978 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0
1979 };
1981 // Return true if any of the strings in null-terminated array 'names' matches.
1982 // If tail_allowed is true, then the tail must begin with a colon; otherwise,
1983 // the option must match exactly.
1984 static bool match_option(const JavaVMOption* option, const char** names, const char** tail,
1985 bool tail_allowed) {
1986 for (/* empty */; *names != NULL; ++names) {
1987 if (match_option(option, *names, tail)) {
1988 if (**tail == '\0' || tail_allowed && **tail == ':') {
1989 return true;
1990 }
1991 }
1992 }
1993 return false;
1994 }
1996 bool Arguments::parse_uintx(const char* value,
1997 uintx* uintx_arg,
1998 uintx min_size) {
2000 // Check the sign first since atomull() parses only unsigned values.
2001 bool value_is_positive = !(*value == '-');
2003 if (value_is_positive) {
2004 julong n;
2005 bool good_return = atomull(value, &n);
2006 if (good_return) {
2007 bool above_minimum = n >= min_size;
2008 bool value_is_too_large = n > max_uintx;
2010 if (above_minimum && !value_is_too_large) {
2011 *uintx_arg = n;
2012 return true;
2013 }
2014 }
2015 }
2016 return false;
2017 }
2019 Arguments::ArgsRange Arguments::parse_memory_size(const char* s,
2020 julong* long_arg,
2021 julong min_size) {
2022 if (!atomull(s, long_arg)) return arg_unreadable;
2023 return check_memory_size(*long_arg, min_size);
2024 }
2026 // Parse JavaVMInitArgs structure
2028 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) {
2029 // For components of the system classpath.
2030 SysClassPath scp(Arguments::get_sysclasspath());
2031 bool scp_assembly_required = false;
2033 // Save default settings for some mode flags
2034 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods;
2035 Arguments::_UseOnStackReplacement = UseOnStackReplacement;
2036 Arguments::_ClipInlining = ClipInlining;
2037 Arguments::_BackgroundCompilation = BackgroundCompilation;
2039 // Setup flags for mixed which is the default
2040 set_mode_flags(_mixed);
2042 // Parse JAVA_TOOL_OPTIONS environment variable (if present)
2043 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required);
2044 if (result != JNI_OK) {
2045 return result;
2046 }
2048 // Parse JavaVMInitArgs structure passed in
2049 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE);
2050 if (result != JNI_OK) {
2051 return result;
2052 }
2054 if (AggressiveOpts) {
2055 // Insert alt-rt.jar between user-specified bootclasspath
2056 // prefix and the default bootclasspath. os::set_boot_path()
2057 // uses meta_index_dir as the default bootclasspath directory.
2058 const char* altclasses_jar = "alt-rt.jar";
2059 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 +
2060 strlen(altclasses_jar);
2061 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len);
2062 strcpy(altclasses_path, get_meta_index_dir());
2063 strcat(altclasses_path, altclasses_jar);
2064 scp.add_suffix_to_prefix(altclasses_path);
2065 scp_assembly_required = true;
2066 FREE_C_HEAP_ARRAY(char, altclasses_path);
2067 }
2069 if (WhiteBoxAPI) {
2070 // Append wb.jar to bootclasspath if enabled
2071 const char* wb_jar = "wb.jar";
2072 size_t wb_path_len = strlen(get_meta_index_dir()) + 1 +
2073 strlen(wb_jar);
2074 char* wb_path = NEW_C_HEAP_ARRAY(char, wb_path_len);
2075 strcpy(wb_path, get_meta_index_dir());
2076 strcat(wb_path, wb_jar);
2077 scp.add_suffix(wb_path);
2078 scp_assembly_required = true;
2079 FREE_C_HEAP_ARRAY(char, wb_path);
2080 }
2082 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM)
2083 result = parse_java_options_environment_variable(&scp, &scp_assembly_required);
2084 if (result != JNI_OK) {
2085 return result;
2086 }
2088 // Do final processing now that all arguments have been parsed
2089 result = finalize_vm_init_args(&scp, scp_assembly_required);
2090 if (result != JNI_OK) {
2091 return result;
2092 }
2094 return JNI_OK;
2095 }
2097 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args,
2098 SysClassPath* scp_p,
2099 bool* scp_assembly_required_p,
2100 FlagValueOrigin origin) {
2101 // Remaining part of option string
2102 const char* tail;
2104 // iterate over arguments
2105 for (int index = 0; index < args->nOptions; index++) {
2106 bool is_absolute_path = false; // for -agentpath vs -agentlib
2108 const JavaVMOption* option = args->options + index;
2110 if (!match_option(option, "-Djava.class.path", &tail) &&
2111 !match_option(option, "-Dsun.java.command", &tail) &&
2112 !match_option(option, "-Dsun.java.launcher", &tail)) {
2114 // add all jvm options to the jvm_args string. This string
2115 // is used later to set the java.vm.args PerfData string constant.
2116 // the -Djava.class.path and the -Dsun.java.command options are
2117 // omitted from jvm_args string as each have their own PerfData
2118 // string constant object.
2119 build_jvm_args(option->optionString);
2120 }
2122 // -verbose:[class/gc/jni]
2123 if (match_option(option, "-verbose", &tail)) {
2124 if (!strcmp(tail, ":class") || !strcmp(tail, "")) {
2125 FLAG_SET_CMDLINE(bool, TraceClassLoading, true);
2126 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true);
2127 } else if (!strcmp(tail, ":gc")) {
2128 FLAG_SET_CMDLINE(bool, PrintGC, true);
2129 } else if (!strcmp(tail, ":jni")) {
2130 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true);
2131 }
2132 // -da / -ea / -disableassertions / -enableassertions
2133 // These accept an optional class/package name separated by a colon, e.g.,
2134 // -da:java.lang.Thread.
2135 } else if (match_option(option, user_assertion_options, &tail, true)) {
2136 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2137 if (*tail == '\0') {
2138 JavaAssertions::setUserClassDefault(enable);
2139 } else {
2140 assert(*tail == ':', "bogus match by match_option()");
2141 JavaAssertions::addOption(tail + 1, enable);
2142 }
2143 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions
2144 } else if (match_option(option, system_assertion_options, &tail, false)) {
2145 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e'
2146 JavaAssertions::setSystemClassDefault(enable);
2147 // -bootclasspath:
2148 } else if (match_option(option, "-Xbootclasspath:", &tail)) {
2149 scp_p->reset_path(tail);
2150 *scp_assembly_required_p = true;
2151 // -bootclasspath/a:
2152 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) {
2153 scp_p->add_suffix(tail);
2154 *scp_assembly_required_p = true;
2155 // -bootclasspath/p:
2156 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) {
2157 scp_p->add_prefix(tail);
2158 *scp_assembly_required_p = true;
2159 // -Xrun
2160 } else if (match_option(option, "-Xrun", &tail)) {
2161 if (tail != NULL) {
2162 const char* pos = strchr(tail, ':');
2163 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2164 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2165 name[len] = '\0';
2167 char *options = NULL;
2168 if(pos != NULL) {
2169 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied.
2170 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2);
2171 }
2172 #ifdef JVMTI_KERNEL
2173 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2174 warning("profiling and debugging agents are not supported with Kernel VM");
2175 } else
2176 #endif // JVMTI_KERNEL
2177 add_init_library(name, options);
2178 }
2179 // -agentlib and -agentpath
2180 } else if (match_option(option, "-agentlib:", &tail) ||
2181 (is_absolute_path = match_option(option, "-agentpath:", &tail))) {
2182 if(tail != NULL) {
2183 const char* pos = strchr(tail, '=');
2184 size_t len = (pos == NULL) ? strlen(tail) : pos - tail;
2185 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len);
2186 name[len] = '\0';
2188 char *options = NULL;
2189 if(pos != NULL) {
2190 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1);
2191 }
2192 #ifdef JVMTI_KERNEL
2193 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) {
2194 warning("profiling and debugging agents are not supported with Kernel VM");
2195 } else
2196 #endif // JVMTI_KERNEL
2197 add_init_agent(name, options, is_absolute_path);
2199 }
2200 // -javaagent
2201 } else if (match_option(option, "-javaagent:", &tail)) {
2202 if(tail != NULL) {
2203 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail);
2204 add_init_agent("instrument", options, false);
2205 }
2206 // -Xnoclassgc
2207 } else if (match_option(option, "-Xnoclassgc", &tail)) {
2208 FLAG_SET_CMDLINE(bool, ClassUnloading, false);
2209 // -Xincgc: i-CMS
2210 } else if (match_option(option, "-Xincgc", &tail)) {
2211 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2212 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true);
2213 // -Xnoincgc: no i-CMS
2214 } else if (match_option(option, "-Xnoincgc", &tail)) {
2215 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2216 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false);
2217 // -Xconcgc
2218 } else if (match_option(option, "-Xconcgc", &tail)) {
2219 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true);
2220 // -Xnoconcgc
2221 } else if (match_option(option, "-Xnoconcgc", &tail)) {
2222 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false);
2223 // -Xbatch
2224 } else if (match_option(option, "-Xbatch", &tail)) {
2225 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2226 // -Xmn for compatibility with other JVM vendors
2227 } else if (match_option(option, "-Xmn", &tail)) {
2228 julong long_initial_eden_size = 0;
2229 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1);
2230 if (errcode != arg_in_range) {
2231 jio_fprintf(defaultStream::error_stream(),
2232 "Invalid initial eden size: %s\n", option->optionString);
2233 describe_range_error(errcode);
2234 return JNI_EINVAL;
2235 }
2236 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size);
2237 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size);
2238 // -Xms
2239 } else if (match_option(option, "-Xms", &tail)) {
2240 julong long_initial_heap_size = 0;
2241 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1);
2242 if (errcode != arg_in_range) {
2243 jio_fprintf(defaultStream::error_stream(),
2244 "Invalid initial heap size: %s\n", option->optionString);
2245 describe_range_error(errcode);
2246 return JNI_EINVAL;
2247 }
2248 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size);
2249 // Currently the minimum size and the initial heap sizes are the same.
2250 set_min_heap_size(InitialHeapSize);
2251 // -Xmx
2252 } else if (match_option(option, "-Xmx", &tail)) {
2253 julong long_max_heap_size = 0;
2254 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1);
2255 if (errcode != arg_in_range) {
2256 jio_fprintf(defaultStream::error_stream(),
2257 "Invalid maximum heap size: %s\n", option->optionString);
2258 describe_range_error(errcode);
2259 return JNI_EINVAL;
2260 }
2261 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size);
2262 // Xmaxf
2263 } else if (match_option(option, "-Xmaxf", &tail)) {
2264 int maxf = (int)(atof(tail) * 100);
2265 if (maxf < 0 || maxf > 100) {
2266 jio_fprintf(defaultStream::error_stream(),
2267 "Bad max heap free percentage size: %s\n",
2268 option->optionString);
2269 return JNI_EINVAL;
2270 } else {
2271 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf);
2272 }
2273 // Xminf
2274 } else if (match_option(option, "-Xminf", &tail)) {
2275 int minf = (int)(atof(tail) * 100);
2276 if (minf < 0 || minf > 100) {
2277 jio_fprintf(defaultStream::error_stream(),
2278 "Bad min heap free percentage size: %s\n",
2279 option->optionString);
2280 return JNI_EINVAL;
2281 } else {
2282 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf);
2283 }
2284 // -Xss
2285 } else if (match_option(option, "-Xss", &tail)) {
2286 julong long_ThreadStackSize = 0;
2287 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000);
2288 if (errcode != arg_in_range) {
2289 jio_fprintf(defaultStream::error_stream(),
2290 "Invalid thread stack size: %s\n", option->optionString);
2291 describe_range_error(errcode);
2292 return JNI_EINVAL;
2293 }
2294 // Internally track ThreadStackSize in units of 1024 bytes.
2295 FLAG_SET_CMDLINE(intx, ThreadStackSize,
2296 round_to((int)long_ThreadStackSize, K) / K);
2297 // -Xoss
2298 } else if (match_option(option, "-Xoss", &tail)) {
2299 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility
2300 // -Xmaxjitcodesize
2301 } else if (match_option(option, "-Xmaxjitcodesize", &tail) ||
2302 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) {
2303 julong long_ReservedCodeCacheSize = 0;
2304 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize,
2305 (size_t)InitialCodeCacheSize);
2306 if (errcode != arg_in_range) {
2307 jio_fprintf(defaultStream::error_stream(),
2308 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n",
2309 option->optionString, InitialCodeCacheSize/K);
2310 describe_range_error(errcode);
2311 return JNI_EINVAL;
2312 }
2313 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize);
2314 // -green
2315 } else if (match_option(option, "-green", &tail)) {
2316 jio_fprintf(defaultStream::error_stream(),
2317 "Green threads support not available\n");
2318 return JNI_EINVAL;
2319 // -native
2320 } else if (match_option(option, "-native", &tail)) {
2321 // HotSpot always uses native threads, ignore silently for compatibility
2322 // -Xsqnopause
2323 } else if (match_option(option, "-Xsqnopause", &tail)) {
2324 // EVM option, ignore silently for compatibility
2325 // -Xrs
2326 } else if (match_option(option, "-Xrs", &tail)) {
2327 // Classic/EVM option, new functionality
2328 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true);
2329 } else if (match_option(option, "-Xusealtsigs", &tail)) {
2330 // change default internal VM signals used - lower case for back compat
2331 FLAG_SET_CMDLINE(bool, UseAltSigs, true);
2332 // -Xoptimize
2333 } else if (match_option(option, "-Xoptimize", &tail)) {
2334 // EVM option, ignore silently for compatibility
2335 // -Xprof
2336 } else if (match_option(option, "-Xprof", &tail)) {
2337 #ifndef FPROF_KERNEL
2338 _has_profile = true;
2339 #else // FPROF_KERNEL
2340 // do we have to exit?
2341 warning("Kernel VM does not support flat profiling.");
2342 #endif // FPROF_KERNEL
2343 // -Xaprof
2344 } else if (match_option(option, "-Xaprof", &tail)) {
2345 _has_alloc_profile = true;
2346 // -Xconcurrentio
2347 } else if (match_option(option, "-Xconcurrentio", &tail)) {
2348 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true);
2349 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false);
2350 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1);
2351 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2352 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation
2354 // -Xinternalversion
2355 } else if (match_option(option, "-Xinternalversion", &tail)) {
2356 jio_fprintf(defaultStream::output_stream(), "%s\n",
2357 VM_Version::internal_vm_info_string());
2358 vm_exit(0);
2359 #ifndef PRODUCT
2360 // -Xprintflags
2361 } else if (match_option(option, "-Xprintflags", &tail)) {
2362 CommandLineFlags::printFlags(tty, false);
2363 vm_exit(0);
2364 #endif
2365 // -D
2366 } else if (match_option(option, "-D", &tail)) {
2367 if (!add_property(tail)) {
2368 return JNI_ENOMEM;
2369 }
2370 // Out of the box management support
2371 if (match_option(option, "-Dcom.sun.management", &tail)) {
2372 FLAG_SET_CMDLINE(bool, ManagementServer, true);
2373 }
2374 // -Xint
2375 } else if (match_option(option, "-Xint", &tail)) {
2376 set_mode_flags(_int);
2377 // -Xmixed
2378 } else if (match_option(option, "-Xmixed", &tail)) {
2379 set_mode_flags(_mixed);
2380 // -Xcomp
2381 } else if (match_option(option, "-Xcomp", &tail)) {
2382 // for testing the compiler; turn off all flags that inhibit compilation
2383 set_mode_flags(_comp);
2385 // -Xshare:dump
2386 } else if (match_option(option, "-Xshare:dump", &tail)) {
2387 #ifdef TIERED
2388 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2389 set_mode_flags(_int); // Prevent compilation, which creates objects
2390 #elif defined(COMPILER2)
2391 vm_exit_during_initialization(
2392 "Dumping a shared archive is not supported on the Server JVM.", NULL);
2393 #elif defined(KERNEL)
2394 vm_exit_during_initialization(
2395 "Dumping a shared archive is not supported on the Kernel JVM.", NULL);
2396 #else
2397 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true);
2398 set_mode_flags(_int); // Prevent compilation, which creates objects
2399 #endif
2400 // -Xshare:on
2401 } else if (match_option(option, "-Xshare:on", &tail)) {
2402 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2403 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true);
2404 // -Xshare:auto
2405 } else if (match_option(option, "-Xshare:auto", &tail)) {
2406 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true);
2407 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2408 // -Xshare:off
2409 } else if (match_option(option, "-Xshare:off", &tail)) {
2410 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false);
2411 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false);
2413 // -Xverify
2414 } else if (match_option(option, "-Xverify", &tail)) {
2415 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) {
2416 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true);
2417 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2418 } else if (strcmp(tail, ":remote") == 0) {
2419 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2420 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true);
2421 } else if (strcmp(tail, ":none") == 0) {
2422 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false);
2423 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false);
2424 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) {
2425 return JNI_EINVAL;
2426 }
2427 // -Xdebug
2428 } else if (match_option(option, "-Xdebug", &tail)) {
2429 // note this flag has been used, then ignore
2430 set_xdebug_mode(true);
2431 // -Xnoagent
2432 } else if (match_option(option, "-Xnoagent", &tail)) {
2433 // For compatibility with classic. HotSpot refuses to load the old style agent.dll.
2434 } else if (match_option(option, "-Xboundthreads", &tail)) {
2435 // Bind user level threads to kernel threads (Solaris only)
2436 FLAG_SET_CMDLINE(bool, UseBoundThreads, true);
2437 } else if (match_option(option, "-Xloggc:", &tail)) {
2438 // Redirect GC output to the file. -Xloggc:<filename>
2439 // ostream_init_log(), when called will use this filename
2440 // to initialize a fileStream.
2441 _gc_log_filename = strdup(tail);
2442 FLAG_SET_CMDLINE(bool, PrintGC, true);
2443 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true);
2445 // JNI hooks
2446 } else if (match_option(option, "-Xcheck", &tail)) {
2447 if (!strcmp(tail, ":jni")) {
2448 CheckJNICalls = true;
2449 } else if (is_bad_option(option, args->ignoreUnrecognized,
2450 "check")) {
2451 return JNI_EINVAL;
2452 }
2453 } else if (match_option(option, "vfprintf", &tail)) {
2454 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo);
2455 } else if (match_option(option, "exit", &tail)) {
2456 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo);
2457 } else if (match_option(option, "abort", &tail)) {
2458 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo);
2459 // -XX:+AggressiveHeap
2460 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) {
2462 // This option inspects the machine and attempts to set various
2463 // parameters to be optimal for long-running, memory allocation
2464 // intensive jobs. It is intended for machines with large
2465 // amounts of cpu and memory.
2467 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit
2468 // VM, but we may not be able to represent the total physical memory
2469 // available (like having 8gb of memory on a box but using a 32bit VM).
2470 // Thus, we need to make sure we're using a julong for intermediate
2471 // calculations.
2472 julong initHeapSize;
2473 julong total_memory = os::physical_memory();
2475 if (total_memory < (julong)256*M) {
2476 jio_fprintf(defaultStream::error_stream(),
2477 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n");
2478 vm_exit(1);
2479 }
2481 // The heap size is half of available memory, or (at most)
2482 // all of possible memory less 160mb (leaving room for the OS
2483 // when using ISM). This is the maximum; because adaptive sizing
2484 // is turned on below, the actual space used may be smaller.
2486 initHeapSize = MIN2(total_memory / (julong)2,
2487 total_memory - (julong)160*M);
2489 // Make sure that if we have a lot of memory we cap the 32 bit
2490 // process space. The 64bit VM version of this function is a nop.
2491 initHeapSize = os::allocatable_physical_memory(initHeapSize);
2493 // The perm gen is separate but contiguous with the
2494 // object heap (and is reserved with it) so subtract it
2495 // from the heap size.
2496 if (initHeapSize > MaxPermSize) {
2497 initHeapSize = initHeapSize - MaxPermSize;
2498 } else {
2499 warning("AggressiveHeap and MaxPermSize values may conflict");
2500 }
2502 if (FLAG_IS_DEFAULT(MaxHeapSize)) {
2503 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize);
2504 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize);
2505 // Currently the minimum size and the initial heap sizes are the same.
2506 set_min_heap_size(initHeapSize);
2507 }
2508 if (FLAG_IS_DEFAULT(NewSize)) {
2509 // Make the young generation 3/8ths of the total heap.
2510 FLAG_SET_CMDLINE(uintx, NewSize,
2511 ((julong)MaxHeapSize / (julong)8) * (julong)3);
2512 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize);
2513 }
2515 FLAG_SET_DEFAULT(UseLargePages, true);
2517 // Increase some data structure sizes for efficiency
2518 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize);
2519 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2520 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K);
2522 // See the OldPLABSize comment below, but replace 'after promotion'
2523 // with 'after copying'. YoungPLABSize is the size of the survivor
2524 // space per-gc-thread buffers. The default is 4kw.
2525 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words
2527 // OldPLABSize is the size of the buffers in the old gen that
2528 // UseParallelGC uses to promote live data that doesn't fit in the
2529 // survivor spaces. At any given time, there's one for each gc thread.
2530 // The default size is 1kw. These buffers are rarely used, since the
2531 // survivor spaces are usually big enough. For specjbb, however, there
2532 // are occasions when there's lots of live data in the young gen
2533 // and we end up promoting some of it. We don't have a definite
2534 // explanation for why bumping OldPLABSize helps, but the theory
2535 // is that a bigger PLAB results in retaining something like the
2536 // original allocation order after promotion, which improves mutator
2537 // locality. A minor effect may be that larger PLABs reduce the
2538 // number of PLAB allocation events during gc. The value of 8kw
2539 // was arrived at by experimenting with specjbb.
2540 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words
2542 // Enable parallel GC and adaptive generation sizing
2543 FLAG_SET_CMDLINE(bool, UseParallelGC, true);
2544 FLAG_SET_DEFAULT(ParallelGCThreads,
2545 Abstract_VM_Version::parallel_worker_threads());
2547 // Encourage steady state memory management
2548 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100);
2550 // This appears to improve mutator locality
2551 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2553 // Get around early Solaris scheduling bug
2554 // (affinity vs other jobs on system)
2555 // but disallow DR and offlining (5008695).
2556 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true);
2558 } else if (match_option(option, "-XX:+NeverTenure", &tail)) {
2559 // The last option must always win.
2560 FLAG_SET_CMDLINE(bool, AlwaysTenure, false);
2561 FLAG_SET_CMDLINE(bool, NeverTenure, true);
2562 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) {
2563 // The last option must always win.
2564 FLAG_SET_CMDLINE(bool, NeverTenure, false);
2565 FLAG_SET_CMDLINE(bool, AlwaysTenure, true);
2566 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) ||
2567 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) {
2568 jio_fprintf(defaultStream::error_stream(),
2569 "Please use CMSClassUnloadingEnabled in place of "
2570 "CMSPermGenSweepingEnabled in the future\n");
2571 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) {
2572 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true);
2573 jio_fprintf(defaultStream::error_stream(),
2574 "Please use -XX:+UseGCOverheadLimit in place of "
2575 "-XX:+UseGCTimeLimit in the future\n");
2576 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) {
2577 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false);
2578 jio_fprintf(defaultStream::error_stream(),
2579 "Please use -XX:-UseGCOverheadLimit in place of "
2580 "-XX:-UseGCTimeLimit in the future\n");
2581 // The TLE options are for compatibility with 1.3 and will be
2582 // removed without notice in a future release. These options
2583 // are not to be documented.
2584 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) {
2585 // No longer used.
2586 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) {
2587 FLAG_SET_CMDLINE(bool, ResizeTLAB, true);
2588 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) {
2589 FLAG_SET_CMDLINE(bool, ResizeTLAB, false);
2590 } else if (match_option(option, "-XX:+PrintTLE", &tail)) {
2591 FLAG_SET_CMDLINE(bool, PrintTLAB, true);
2592 } else if (match_option(option, "-XX:-PrintTLE", &tail)) {
2593 FLAG_SET_CMDLINE(bool, PrintTLAB, false);
2594 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) {
2595 // No longer used.
2596 } else if (match_option(option, "-XX:TLESize=", &tail)) {
2597 julong long_tlab_size = 0;
2598 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1);
2599 if (errcode != arg_in_range) {
2600 jio_fprintf(defaultStream::error_stream(),
2601 "Invalid TLAB size: %s\n", option->optionString);
2602 describe_range_error(errcode);
2603 return JNI_EINVAL;
2604 }
2605 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size);
2606 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) {
2607 // No longer used.
2608 } else if (match_option(option, "-XX:+UseTLE", &tail)) {
2609 FLAG_SET_CMDLINE(bool, UseTLAB, true);
2610 } else if (match_option(option, "-XX:-UseTLE", &tail)) {
2611 FLAG_SET_CMDLINE(bool, UseTLAB, false);
2612 SOLARIS_ONLY(
2613 } else if (match_option(option, "-XX:+UsePermISM", &tail)) {
2614 warning("-XX:+UsePermISM is obsolete.");
2615 FLAG_SET_CMDLINE(bool, UseISM, true);
2616 } else if (match_option(option, "-XX:-UsePermISM", &tail)) {
2617 FLAG_SET_CMDLINE(bool, UseISM, false);
2618 )
2619 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) {
2620 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false);
2621 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true);
2622 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) {
2623 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false);
2624 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true);
2625 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) {
2626 #if defined(DTRACE_ENABLED)
2627 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true);
2628 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true);
2629 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true);
2630 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true);
2631 #else // defined(DTRACE_ENABLED)
2632 jio_fprintf(defaultStream::error_stream(),
2633 "ExtendedDTraceProbes flag is not applicable for this configuration\n");
2634 return JNI_EINVAL;
2635 #endif // defined(DTRACE_ENABLED)
2636 #ifdef ASSERT
2637 } else if (match_option(option, "-XX:+FullGCALot", &tail)) {
2638 FLAG_SET_CMDLINE(bool, FullGCALot, true);
2639 // disable scavenge before parallel mark-compact
2640 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false);
2641 #endif
2642 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) {
2643 julong cms_blocks_to_claim = (julong)atol(tail);
2644 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2645 jio_fprintf(defaultStream::error_stream(),
2646 "Please use -XX:OldPLABSize in place of "
2647 "-XX:CMSParPromoteBlocksToClaim in the future\n");
2648 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) {
2649 julong cms_blocks_to_claim = (julong)atol(tail);
2650 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim);
2651 jio_fprintf(defaultStream::error_stream(),
2652 "Please use -XX:OldPLABSize in place of "
2653 "-XX:ParCMSPromoteBlocksToClaim in the future\n");
2654 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) {
2655 julong old_plab_size = 0;
2656 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1);
2657 if (errcode != arg_in_range) {
2658 jio_fprintf(defaultStream::error_stream(),
2659 "Invalid old PLAB size: %s\n", option->optionString);
2660 describe_range_error(errcode);
2661 return JNI_EINVAL;
2662 }
2663 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size);
2664 jio_fprintf(defaultStream::error_stream(),
2665 "Please use -XX:OldPLABSize in place of "
2666 "-XX:ParallelGCOldGenAllocBufferSize in the future\n");
2667 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) {
2668 julong young_plab_size = 0;
2669 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1);
2670 if (errcode != arg_in_range) {
2671 jio_fprintf(defaultStream::error_stream(),
2672 "Invalid young PLAB size: %s\n", option->optionString);
2673 describe_range_error(errcode);
2674 return JNI_EINVAL;
2675 }
2676 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size);
2677 jio_fprintf(defaultStream::error_stream(),
2678 "Please use -XX:YoungPLABSize in place of "
2679 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n");
2680 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) ||
2681 match_option(option, "-XX:G1MarkStackSize=", &tail)) {
2682 julong stack_size = 0;
2683 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1);
2684 if (errcode != arg_in_range) {
2685 jio_fprintf(defaultStream::error_stream(),
2686 "Invalid mark stack size: %s\n", option->optionString);
2687 describe_range_error(errcode);
2688 return JNI_EINVAL;
2689 }
2690 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size);
2691 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) {
2692 julong max_stack_size = 0;
2693 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1);
2694 if (errcode != arg_in_range) {
2695 jio_fprintf(defaultStream::error_stream(),
2696 "Invalid maximum mark stack size: %s\n",
2697 option->optionString);
2698 describe_range_error(errcode);
2699 return JNI_EINVAL;
2700 }
2701 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size);
2702 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) ||
2703 match_option(option, "-XX:ParallelCMSThreads=", &tail)) {
2704 uintx conc_threads = 0;
2705 if (!parse_uintx(tail, &conc_threads, 1)) {
2706 jio_fprintf(defaultStream::error_stream(),
2707 "Invalid concurrent threads: %s\n", option->optionString);
2708 return JNI_EINVAL;
2709 }
2710 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads);
2711 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx
2712 // Skip -XX:Flags= since that case has already been handled
2713 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) {
2714 if (!process_argument(tail, args->ignoreUnrecognized, origin)) {
2715 return JNI_EINVAL;
2716 }
2717 }
2718 // Unknown option
2719 } else if (is_bad_option(option, args->ignoreUnrecognized)) {
2720 return JNI_ERR;
2721 }
2722 }
2724 // Change the default value for flags which have different default values
2725 // when working with older JDKs.
2726 if (JDK_Version::current().compare_major(6) <= 0 &&
2727 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) {
2728 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true);
2729 }
2730 #ifdef LINUX
2731 if (JDK_Version::current().compare_major(6) <= 0 &&
2732 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) {
2733 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false);
2734 }
2735 #endif // LINUX
2736 return JNI_OK;
2737 }
2739 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) {
2740 // This must be done after all -D arguments have been processed.
2741 scp_p->expand_endorsed();
2743 if (scp_assembly_required || scp_p->get_endorsed() != NULL) {
2744 // Assemble the bootclasspath elements into the final path.
2745 Arguments::set_sysclasspath(scp_p->combined_path());
2746 }
2748 // This must be done after all arguments have been processed.
2749 // java_compiler() true means set to "NONE" or empty.
2750 if (java_compiler() && !xdebug_mode()) {
2751 // For backwards compatibility, we switch to interpreted mode if
2752 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was
2753 // not specified.
2754 set_mode_flags(_int);
2755 }
2756 if (CompileThreshold == 0) {
2757 set_mode_flags(_int);
2758 }
2760 #ifndef COMPILER2
2761 // Don't degrade server performance for footprint
2762 if (FLAG_IS_DEFAULT(UseLargePages) &&
2763 MaxHeapSize < LargePageHeapSizeThreshold) {
2764 // No need for large granularity pages w/small heaps.
2765 // Note that large pages are enabled/disabled for both the
2766 // Java heap and the code cache.
2767 FLAG_SET_DEFAULT(UseLargePages, false);
2768 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false));
2769 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false));
2770 }
2772 // Tiered compilation is undefined with C1.
2773 TieredCompilation = false;
2774 #else
2775 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) {
2776 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1);
2777 }
2778 #endif
2780 // If we are running in a headless jre, force java.awt.headless property
2781 // to be true unless the property has already been set.
2782 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state.
2783 if (os::is_headless_jre()) {
2784 const char* headless = Arguments::get_property("java.awt.headless");
2785 if (headless == NULL) {
2786 char envbuffer[128];
2787 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) {
2788 if (!add_property("java.awt.headless=true")) {
2789 return JNI_ENOMEM;
2790 }
2791 } else {
2792 char buffer[256];
2793 strcpy(buffer, "java.awt.headless=");
2794 strcat(buffer, envbuffer);
2795 if (!add_property(buffer)) {
2796 return JNI_ENOMEM;
2797 }
2798 }
2799 }
2800 }
2802 if (!check_vm_args_consistency()) {
2803 return JNI_ERR;
2804 }
2806 return JNI_OK;
2807 }
2809 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2810 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p,
2811 scp_assembly_required_p);
2812 }
2814 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) {
2815 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p,
2816 scp_assembly_required_p);
2817 }
2819 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) {
2820 const int N_MAX_OPTIONS = 64;
2821 const int OPTION_BUFFER_SIZE = 1024;
2822 char buffer[OPTION_BUFFER_SIZE];
2824 // The variable will be ignored if it exceeds the length of the buffer.
2825 // Don't check this variable if user has special privileges
2826 // (e.g. unix su command).
2827 if (os::getenv(name, buffer, sizeof(buffer)) &&
2828 !os::have_special_privileges()) {
2829 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array
2830 jio_fprintf(defaultStream::error_stream(),
2831 "Picked up %s: %s\n", name, buffer);
2832 char* rd = buffer; // pointer to the input string (rd)
2833 int i;
2834 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string
2835 while (isspace(*rd)) rd++; // skip whitespace
2836 if (*rd == 0) break; // we re done when the input string is read completely
2838 // The output, option string, overwrites the input string.
2839 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to
2840 // input string (rd).
2841 char* wrt = rd;
2843 options[i++].optionString = wrt; // Fill in option
2844 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL
2845 if (*rd == '\'' || *rd == '"') { // handle a quoted string
2846 int quote = *rd; // matching quote to look for
2847 rd++; // don't copy open quote
2848 while (*rd != quote) { // include everything (even spaces) up until quote
2849 if (*rd == 0) { // string termination means unmatched string
2850 jio_fprintf(defaultStream::error_stream(),
2851 "Unmatched quote in %s\n", name);
2852 return JNI_ERR;
2853 }
2854 *wrt++ = *rd++; // copy to option string
2855 }
2856 rd++; // don't copy close quote
2857 } else {
2858 *wrt++ = *rd++; // copy to option string
2859 }
2860 }
2861 // Need to check if we're done before writing a NULL,
2862 // because the write could be to the byte that rd is pointing to.
2863 if (*rd++ == 0) {
2864 *wrt = 0;
2865 break;
2866 }
2867 *wrt = 0; // Zero terminate option
2868 }
2869 // Construct JavaVMInitArgs structure and parse as if it was part of the command line
2870 JavaVMInitArgs vm_args;
2871 vm_args.version = JNI_VERSION_1_2;
2872 vm_args.options = options;
2873 vm_args.nOptions = i;
2874 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions;
2876 if (PrintVMOptions) {
2877 const char* tail;
2878 for (int i = 0; i < vm_args.nOptions; i++) {
2879 const JavaVMOption *option = vm_args.options + i;
2880 if (match_option(option, "-XX:", &tail)) {
2881 logOption(tail);
2882 }
2883 }
2884 }
2886 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR));
2887 }
2888 return JNI_OK;
2889 }
2891 void Arguments::set_shared_spaces_flags() {
2892 const bool must_share = DumpSharedSpaces || RequireSharedSpaces;
2893 const bool might_share = must_share || UseSharedSpaces;
2895 // The string table is part of the shared archive so the size must match.
2896 if (!FLAG_IS_DEFAULT(StringTableSize)) {
2897 // Disable sharing.
2898 if (must_share) {
2899 warning("disabling shared archive %s because of non-default "
2900 "StringTableSize", DumpSharedSpaces ? "creation" : "use");
2901 }
2902 if (might_share) {
2903 FLAG_SET_DEFAULT(DumpSharedSpaces, false);
2904 FLAG_SET_DEFAULT(RequireSharedSpaces, false);
2905 FLAG_SET_DEFAULT(UseSharedSpaces, false);
2906 }
2907 return;
2908 }
2910 // Check whether class data sharing settings conflict with GC, compressed oops
2911 // or page size, and fix them up. Explicit sharing options override other
2912 // settings.
2913 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode ||
2914 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC ||
2915 UseCompressedOops || UseLargePages && FLAG_IS_CMDLINE(UseLargePages);
2916 if (cannot_share) {
2917 if (must_share) {
2918 warning("selecting serial gc and disabling large pages %s"
2919 "because of %s", "" LP64_ONLY("and compressed oops "),
2920 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on");
2921 force_serial_gc();
2922 FLAG_SET_CMDLINE(bool, UseLargePages, false);
2923 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false));
2924 } else {
2925 if (UseSharedSpaces && Verbose) {
2926 warning("turning off use of shared archive because of "
2927 "choice of garbage collector or large pages");
2928 }
2929 no_shared_spaces();
2930 }
2931 } else if (UseLargePages && might_share) {
2932 // Disable large pages to allow shared spaces. This is sub-optimal, since
2933 // there may not even be a shared archive to use.
2934 FLAG_SET_DEFAULT(UseLargePages, false);
2935 }
2936 }
2938 // Disable options not supported in this release, with a warning if they
2939 // were explicitly requested on the command-line
2940 #define UNSUPPORTED_OPTION(opt, description) \
2941 do { \
2942 if (opt) { \
2943 if (FLAG_IS_CMDLINE(opt)) { \
2944 warning(description " is disabled in this release."); \
2945 } \
2946 FLAG_SET_DEFAULT(opt, false); \
2947 } \
2948 } while(0)
2950 // Parse entry point called from JNI_CreateJavaVM
2952 jint Arguments::parse(const JavaVMInitArgs* args) {
2954 // Sharing support
2955 // Construct the path to the archive
2956 char jvm_path[JVM_MAXPATHLEN];
2957 os::jvm_path(jvm_path, sizeof(jvm_path));
2958 char *end = strrchr(jvm_path, *os::file_separator());
2959 if (end != NULL) *end = '\0';
2960 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) +
2961 strlen(os::file_separator()) + 20);
2962 if (shared_archive_path == NULL) return JNI_ENOMEM;
2963 strcpy(shared_archive_path, jvm_path);
2964 strcat(shared_archive_path, os::file_separator());
2965 strcat(shared_archive_path, "classes");
2966 DEBUG_ONLY(strcat(shared_archive_path, "_g");)
2967 strcat(shared_archive_path, ".jsa");
2968 SharedArchivePath = shared_archive_path;
2970 // Remaining part of option string
2971 const char* tail;
2973 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed.
2974 bool settings_file_specified = false;
2975 const char* flags_file;
2976 int index;
2977 for (index = 0; index < args->nOptions; index++) {
2978 const JavaVMOption *option = args->options + index;
2979 if (match_option(option, "-XX:Flags=", &tail)) {
2980 flags_file = tail;
2981 settings_file_specified = true;
2982 }
2983 if (match_option(option, "-XX:+PrintVMOptions", &tail)) {
2984 PrintVMOptions = true;
2985 }
2986 if (match_option(option, "-XX:-PrintVMOptions", &tail)) {
2987 PrintVMOptions = false;
2988 }
2989 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) {
2990 IgnoreUnrecognizedVMOptions = true;
2991 }
2992 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) {
2993 IgnoreUnrecognizedVMOptions = false;
2994 }
2995 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) {
2996 CommandLineFlags::printFlags(tty, false);
2997 vm_exit(0);
2998 }
3000 #ifndef PRODUCT
3001 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) {
3002 CommandLineFlags::printFlags(tty, true);
3003 vm_exit(0);
3004 }
3005 #endif
3006 }
3008 if (IgnoreUnrecognizedVMOptions) {
3009 // uncast const to modify the flag args->ignoreUnrecognized
3010 *(jboolean*)(&args->ignoreUnrecognized) = true;
3011 }
3013 // Parse specified settings file
3014 if (settings_file_specified) {
3015 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) {
3016 return JNI_EINVAL;
3017 }
3018 }
3020 // Parse default .hotspotrc settings file
3021 if (!settings_file_specified) {
3022 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) {
3023 return JNI_EINVAL;
3024 }
3025 }
3027 if (PrintVMOptions) {
3028 for (index = 0; index < args->nOptions; index++) {
3029 const JavaVMOption *option = args->options + index;
3030 if (match_option(option, "-XX:", &tail)) {
3031 logOption(tail);
3032 }
3033 }
3034 }
3036 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS
3037 jint result = parse_vm_init_args(args);
3038 if (result != JNI_OK) {
3039 return result;
3040 }
3042 #if (defined JAVASE_EMBEDDED || defined ARM)
3043 UNSUPPORTED_OPTION(UseG1GC, "G1 GC");
3044 #endif
3046 #ifndef PRODUCT
3047 if (TraceBytecodesAt != 0) {
3048 TraceBytecodes = true;
3049 }
3050 if (CountCompiledCalls) {
3051 if (UseCounterDecay) {
3052 warning("UseCounterDecay disabled because CountCalls is set");
3053 UseCounterDecay = false;
3054 }
3055 }
3056 #endif // PRODUCT
3058 // Transitional
3059 if (EnableMethodHandles || AnonymousClasses) {
3060 if (!EnableInvokeDynamic && !FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3061 warning("EnableMethodHandles and AnonymousClasses are obsolete. Keeping EnableInvokeDynamic disabled.");
3062 } else {
3063 EnableInvokeDynamic = true;
3064 }
3065 }
3067 // JSR 292 is not supported before 1.7
3068 if (!JDK_Version::is_gte_jdk17x_version()) {
3069 if (EnableInvokeDynamic) {
3070 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) {
3071 warning("JSR 292 is not supported before 1.7. Disabling support.");
3072 }
3073 EnableInvokeDynamic = false;
3074 }
3075 }
3077 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) {
3078 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3079 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true");
3080 }
3081 ScavengeRootsInCode = 1;
3082 }
3083 if (!JavaObjectsInPerm && ScavengeRootsInCode == 0) {
3084 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) {
3085 warning("forcing ScavengeRootsInCode non-zero because JavaObjectsInPerm is false");
3086 }
3087 ScavengeRootsInCode = 1;
3088 }
3090 if (PrintGCDetails) {
3091 // Turn on -verbose:gc options as well
3092 PrintGC = true;
3093 }
3095 if (!JDK_Version::is_gte_jdk18x_version()) {
3096 // To avoid changing the log format for 7 updates this flag is only
3097 // true by default in JDK8 and above.
3098 if (FLAG_IS_DEFAULT(PrintGCCause)) {
3099 FLAG_SET_DEFAULT(PrintGCCause, false);
3100 }
3101 }
3103 // Set object alignment values.
3104 set_object_alignment();
3106 #ifdef SERIALGC
3107 force_serial_gc();
3108 #endif // SERIALGC
3109 #ifdef KERNEL
3110 no_shared_spaces();
3111 #endif // KERNEL
3113 // Set flags based on ergonomics.
3114 set_ergonomics_flags();
3116 set_shared_spaces_flags();
3118 // Check the GC selections again.
3119 if (!check_gc_consistency()) {
3120 return JNI_EINVAL;
3121 }
3123 if (TieredCompilation) {
3124 set_tiered_flags();
3125 } else {
3126 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup.
3127 if (CompilationPolicyChoice >= 2) {
3128 vm_exit_during_initialization(
3129 "Incompatible compilation policy selected", NULL);
3130 }
3131 }
3133 #ifndef KERNEL
3134 // Set heap size based on available physical memory
3135 set_heap_size();
3136 // Set per-collector flags
3137 if (UseParallelGC || UseParallelOldGC) {
3138 set_parallel_gc_flags();
3139 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below
3140 set_cms_and_parnew_gc_flags();
3141 } else if (UseParNewGC) { // skipped if CMS is set above
3142 set_parnew_gc_flags();
3143 } else if (UseG1GC) {
3144 set_g1_gc_flags();
3145 }
3146 #endif // KERNEL
3148 #ifdef SERIALGC
3149 assert(verify_serial_gc_flags(), "SerialGC unset");
3150 #endif // SERIALGC
3152 // Set bytecode rewriting flags
3153 set_bytecode_flags();
3155 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled.
3156 set_aggressive_opts_flags();
3158 // Turn off biased locking for locking debug mode flags,
3159 // which are subtlely different from each other but neither works with
3160 // biased locking.
3161 if (UseHeavyMonitors
3162 #ifdef COMPILER1
3163 || !UseFastLocking
3164 #endif // COMPILER1
3165 ) {
3166 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) {
3167 // flag set to true on command line; warn the user that they
3168 // can't enable biased locking here
3169 warning("Biased Locking is not supported with locking debug flags"
3170 "; ignoring UseBiasedLocking flag." );
3171 }
3172 UseBiasedLocking = false;
3173 }
3175 #ifdef CC_INTERP
3176 // Clear flags not supported by the C++ interpreter
3177 FLAG_SET_DEFAULT(ProfileInterpreter, false);
3178 FLAG_SET_DEFAULT(UseBiasedLocking, false);
3179 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false));
3180 #endif // CC_INTERP
3182 #ifdef COMPILER2
3183 if (!UseBiasedLocking || EmitSync != 0) {
3184 UseOptoBiasInlining = false;
3185 }
3186 if (!EliminateLocks) {
3187 EliminateNestedLocks = false;
3188 }
3189 #endif
3191 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) {
3192 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output");
3193 DebugNonSafepoints = true;
3194 }
3196 #ifndef PRODUCT
3197 if (CompileTheWorld) {
3198 // Force NmethodSweeper to sweep whole CodeCache each time.
3199 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) {
3200 NmethodSweepFraction = 1;
3201 }
3202 }
3203 #endif
3205 if (PrintCommandLineFlags) {
3206 CommandLineFlags::printSetFlags(tty);
3207 }
3209 // Apply CPU specific policy for the BiasedLocking
3210 if (UseBiasedLocking) {
3211 if (!VM_Version::use_biased_locking() &&
3212 !(FLAG_IS_CMDLINE(UseBiasedLocking))) {
3213 UseBiasedLocking = false;
3214 }
3215 }
3217 // set PauseAtExit if the gamma launcher was used and a debugger is attached
3218 // but only if not already set on the commandline
3219 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) {
3220 bool set = false;
3221 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set);
3222 if (!set) {
3223 FLAG_SET_DEFAULT(PauseAtExit, true);
3224 }
3225 }
3227 return JNI_OK;
3228 }
3230 int Arguments::PropertyList_count(SystemProperty* pl) {
3231 int count = 0;
3232 while(pl != NULL) {
3233 count++;
3234 pl = pl->next();
3235 }
3236 return count;
3237 }
3239 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) {
3240 assert(key != NULL, "just checking");
3241 SystemProperty* prop;
3242 for (prop = pl; prop != NULL; prop = prop->next()) {
3243 if (strcmp(key, prop->key()) == 0) return prop->value();
3244 }
3245 return NULL;
3246 }
3248 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) {
3249 int count = 0;
3250 const char* ret_val = NULL;
3252 while(pl != NULL) {
3253 if(count >= index) {
3254 ret_val = pl->key();
3255 break;
3256 }
3257 count++;
3258 pl = pl->next();
3259 }
3261 return ret_val;
3262 }
3264 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) {
3265 int count = 0;
3266 char* ret_val = NULL;
3268 while(pl != NULL) {
3269 if(count >= index) {
3270 ret_val = pl->value();
3271 break;
3272 }
3273 count++;
3274 pl = pl->next();
3275 }
3277 return ret_val;
3278 }
3280 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) {
3281 SystemProperty* p = *plist;
3282 if (p == NULL) {
3283 *plist = new_p;
3284 } else {
3285 while (p->next() != NULL) {
3286 p = p->next();
3287 }
3288 p->set_next(new_p);
3289 }
3290 }
3292 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) {
3293 if (plist == NULL)
3294 return;
3296 SystemProperty* new_p = new SystemProperty(k, v, true);
3297 PropertyList_add(plist, new_p);
3298 }
3300 // This add maintains unique property key in the list.
3301 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) {
3302 if (plist == NULL)
3303 return;
3305 // If property key exist then update with new value.
3306 SystemProperty* prop;
3307 for (prop = *plist; prop != NULL; prop = prop->next()) {
3308 if (strcmp(k, prop->key()) == 0) {
3309 if (append) {
3310 prop->append_value(v);
3311 } else {
3312 prop->set_value(v);
3313 }
3314 return;
3315 }
3316 }
3318 PropertyList_add(plist, k, v);
3319 }
3321 #ifdef KERNEL
3322 char *Arguments::get_kernel_properties() {
3323 // Find properties starting with kernel and append them to string
3324 // We need to find out how long they are first because the URL's that they
3325 // might point to could get long.
3326 int length = 0;
3327 SystemProperty* prop;
3328 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3329 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3330 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D ="
3331 }
3332 }
3333 // Add one for null terminator.
3334 char *props = AllocateHeap(length + 1, "get_kernel_properties");
3335 if (length != 0) {
3336 int pos = 0;
3337 for (prop = _system_properties; prop != NULL; prop = prop->next()) {
3338 if (strncmp(prop->key(), "kernel.", 7 ) == 0) {
3339 jio_snprintf(&props[pos], length-pos,
3340 "-D%s=%s ", prop->key(), prop->value());
3341 pos = strlen(props);
3342 }
3343 }
3344 }
3345 // null terminate props in case of null
3346 props[length] = '\0';
3347 return props;
3348 }
3349 #endif // KERNEL
3351 // Copies src into buf, replacing "%%" with "%" and "%p" with pid
3352 // Returns true if all of the source pointed by src has been copied over to
3353 // the destination buffer pointed by buf. Otherwise, returns false.
3354 // Notes:
3355 // 1. If the length (buflen) of the destination buffer excluding the
3356 // NULL terminator character is not long enough for holding the expanded
3357 // pid characters, it also returns false instead of returning the partially
3358 // expanded one.
3359 // 2. The passed in "buflen" should be large enough to hold the null terminator.
3360 bool Arguments::copy_expand_pid(const char* src, size_t srclen,
3361 char* buf, size_t buflen) {
3362 const char* p = src;
3363 char* b = buf;
3364 const char* src_end = &src[srclen];
3365 char* buf_end = &buf[buflen - 1];
3367 while (p < src_end && b < buf_end) {
3368 if (*p == '%') {
3369 switch (*(++p)) {
3370 case '%': // "%%" ==> "%"
3371 *b++ = *p++;
3372 break;
3373 case 'p': { // "%p" ==> current process id
3374 // buf_end points to the character before the last character so
3375 // that we could write '\0' to the end of the buffer.
3376 size_t buf_sz = buf_end - b + 1;
3377 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id());
3379 // if jio_snprintf fails or the buffer is not long enough to hold
3380 // the expanded pid, returns false.
3381 if (ret < 0 || ret >= (int)buf_sz) {
3382 return false;
3383 } else {
3384 b += ret;
3385 assert(*b == '\0', "fail in copy_expand_pid");
3386 if (p == src_end && b == buf_end + 1) {
3387 // reach the end of the buffer.
3388 return true;
3389 }
3390 }
3391 p++;
3392 break;
3393 }
3394 default :
3395 *b++ = '%';
3396 }
3397 } else {
3398 *b++ = *p++;
3399 }
3400 }
3401 *b = '\0';
3402 return (p == src_end); // return false if not all of the source was copied
3403 }